JP2017115368A - Steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a steel pipe pile which can be connected by mechanical means.SOLUTION: A steel pipe pile comprises inside joints 10A, 10B, and an outside joint 20 which is circumferentially arranged while straddling the inside joints. An inwardly-oriented key part 23 which is engaged with outwardly-oriented peripheral grooves 13 of the inside joints 10A, 10B is arranged at the outside joint 20, and the outside joint 20 is constituted of a plurality of unit members 21 which are aligned around the inside joints 10A, 10B. A standard unit member 21A comprises engagement protrusions 24. Engagement recesses 14 which are engaged with the engagement protrusions 24, and prevent a fall of the standard unit member 21A to the outside are formed at the inside joints 10A, 10B. Notches 15A, 15B in which the standard unit member 21A can penetrate up to a position in which the engagement protrusions 24 can be engaged with the engagement recesses 14 are formed at a wall face constituting the engagement recesses 14, and a joining part 3 is arranged in a position in which the joining part is not overlapped on the notches 15A, 15B being the inside of the standard unit member 21A.SELECTED DRAWING: Figure 1

Description

  The present invention is a steel pipe pile used for a settling method such as a support pile, a landslide pile, a retaining column pile, and a column of a structure, and in particular, pipes adjacent to each other at both ends of the pipe. The present invention relates to a steel pipe pile in which a connecting part to be connected is provided and the connecting parts of pipes adjacent to each other in the axial direction of the pipe are configured to be freely connectable.

  In general, steel pipe piles are laid down by using a hammering method, a pre-boring method that is inserted into an existing excavation hole, or by rotating and pressing a steel pipe pile while excavating with an auger inserted into the steel pipe pile. There are several methods of digging in the middle, a soil cement synthetic pile method in which steel pipe piles are rotationally buried while creating a soil cement, or a rotary buried pile method in which steel pipe piles are simply rotated and pressed (buried).

  In addition, for the construction work of steel pipe piles, for the purpose of production, transportation, etc., the pipe body of a standard object is carried to the site, the upper pipe body is suspended from the lower pipe body by the crane and butted, and welded. The construction is proceeded while being connected, and the steel pipe pile having a predetermined length is set.

  Since this welding connection is on-site welding, it takes a lot of time and requires a skilled welder, and the quality of the weld is not only affected by the weather, but also the backing ring that accompanies the welding. It is cumbersome and requires a lot of expenses, such as using metal fittings. Therefore, as an alternative to the connection by welding, a method of joining the upper tube body and the lower tube body with a screw joint (for example, Patent Documents 1 to 3) has been proposed.

Japanese Utility Model Publication No. 57-133645 Japanese Utility Model Publication No.59-98923 JP-A-4-70414

  However, the connection with the screw joint is cumbersome to manufacture and expensive. In addition, since the connection of the tubular body is performed by suspending the upper tubular body from the lower tubular body, it is extremely difficult to rotate it for screwing while hanging. In addition, in the construction method in which the pipe body is laid down by rotational press-fitting, there is a case where the tube body is rotated in reverse, and in such a case, the screw is loosened, so this connection method by screwing cannot be adopted.

  The present invention has been made to solve such a problem. In place of connection by welding or screw threading, the connection can be made firmly and easily without using a special machine or skill. Connectable by mechanical means that can be connected to the inner pipe method, soil cement synthetic pile method, rotary buried pile method, etc. It aims to provide steel pipe piles at low cost.

  The feature of the steel pipe pile according to the present invention for achieving the above-described object is that the pipes adjacent to each other in the axial direction of the pipe body are provided with connecting portions that connect the adjacent pipe bodies at both ends of the pipe body. A steel pipe pile configured so that the connection parts of the body can be connected to each other, wherein the connection part is formed from a straight seam steel pipe, and the connection parts can be connected to each other in a state in which adjacent pipes are prevented from being detached from each other. A retaining mechanism and a detent mechanism for preventing relative rotation around the axis of the connected pipe bodies, and the joint of the straight seam steel pipe constitutes at least the retainer mechanism or the detent mechanism It is in the point arrange | positioned in the position which is not a low-rigidity part among the parts whose rigidity in the circumferential direction is lower than other parts.

According to the above-described configuration, the connecting portion includes a retaining mechanism capable of freely connecting adjacent tubular bodies to each other in a retaining state, and a rotation preventing mechanism for preventing relative rotation around the axis of the connected tubular bodies. Therefore, it is possible to connect in a state in which relative rotation between adjacent pipes is prevented.
In other words, the pipes facing each other are connected by the retaining mechanism, and in the construction method in which the pipes are laid down by rotary press-fitting, the relative rotation of the tubular bodies is prevented by the anti-rotation mechanism even if the pipes are reversely rotated. can do.
As a result, it has become possible to use it for the Nakabori method, the soil cement synthetic pile method, the rotary buried pile method, etc., in which the tube is rotated and pressed while excavating with an auger inserted into the tube.

A straight seam steel pipe is manufactured using a sheet winding method. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the connecting portion from a straight seam steel pipe, the connecting portion can be obtained at a low cost.
However, straight seam steel pipes have joints along their longitudinal direction, and are not homogeneous in the circumferential direction like seamless steel pipes, so the same rigidity cannot be obtained in the circumferential direction and they are vulnerable to internal pressure and torsion.
Moreover, the low rigidity part which at least the part which comprises the said retaining mechanism or the said non-rotating mechanism among the said connection parts has the rigidity in the circumferential direction is lower than the other part in the location.
Therefore, the low-rigidity part is provided in the connection part so as to be a position that is not a position across the joint part of the straight seam steel pipe.
By preventing the low-rigidity portion and the joint portion from overlapping each other along the longitudinal direction of the straight seam steel pipe, it is possible to prevent a portion of the connecting portion from becoming too rigid compared to the other portions.

  In this invention, the said connection part is provided in one pipe body among the 1st inner side joint provided in the one end of the said pipe body, the 2nd inner side joint provided in the other end, and an adjacent pipe body. An outer joint that is provided so as to straddle the first inner joint and the second inner joint in a state in which the first inner joint and the second inner joint provided on the other pipe body are adjacent to each other. The outer joint includes a plurality of unit members arranged around the first inner joint and the second inner joint, and the unit member includes a standard unit member and a closed unit member. The standard unit member includes an engaging convex portion at an end portion on the first inner joint side and an end portion on the second inner joint side, and the first inner joint and the second inner joint include An engagement recess for engaging the engagement protrusion to prevent the standard unit member from falling off. In addition, at least a part of the wall surface constituting the engagement recess is provided with a notch portion through which the engagement protrusion of the standard unit member can be inserted to a position corresponding to the engagement recess, and the closing unit member Is not provided with the engaging convex portion, and is configured to be flush with the outer peripheral surface around the notch when arranged in the notch, and at least the first inner joint or the second inner The joint includes a fixing mechanism for fixing the closing unit member, and the retaining mechanism is either one of the outer circumference of the first inner joint and the second inner joint and the inner circumference of the outer joint. And an engaged portion with which the engaging portion engages, and the rotation preventing mechanism includes the closing unit member and the notch portion. The joint is configured to include the first inner joint and Preferably it is disposed at a position not overlapping with the notch of the second inner joint.

According to the above-described configuration, the first inner joint and the first inner joint provided at one end of one pipe body are adjacent to the second inner joint provided at the other end of the other steel pipe. When surrounding the outer joint across the two inner joints, the first inner joint side end and the second inner joint side end of the plurality of unit members constituting the outer joint are engaged. The standard unit member provided with the convex portion can be inserted through the cutout portion, and the engaging portion and the engaged portion can be engaged.
The standard unit member provided around the first inner joint and the second inner joint via the notch portion maintains the engagement between the engagement portion and the engaged portion while maintaining the engagement. A predetermined position of the first inner joint and the second inner joint by sliding a mating convex portion in the circumferential direction of the steel pipe along an engagement concave portion provided in the first inner joint and the second inner joint. Placed in.
The notch is closed by fixing the closing unit member to the first inner joint and the second inner joint. Further, relative movement in the circumferential direction of the first inner joint and the second inner joint connected via the outer joint is also suppressed.
Since the outer joint is made up of a plurality of unit members that are large enough to be lifted by a worker by hand, for example, lifting work by a machine such as a crane becomes unnecessary. Will improve.
Moreover, since the first inner joint and the second inner joint can be configured in the same shape, the processing cost can be reduced.

Of the first inner joint and the second inner joint, the circumferential portion where the notch is formed is less rigid than the other circumferential portions because there is less material at that location. That is, the circumferential portion where the notch is formed is the low rigidity portion.
Then, a notch part is provided in a 1st inner joint and a 2nd inner joint so that it may become a position which is not a position which straddles the junction part which a straight seam steel pipe has.
By ensuring that the notch and the joint do not overlap along the longitudinal direction of the straight seam steel pipe, the first inner joint and the second inner joint are partly less rigid than the other parts. Can be prevented.

  In this invention, the said connection part is provided in one pipe body among the 1st inner side joint provided in the one end of the said pipe body, the 2nd inner side joint provided in the other end, and an adjacent pipe body. An outer joint that is provided so as to straddle the first inner joint and the second inner joint in a state in which the first inner joint and the second inner joint provided on the other pipe body are adjacent to each other. The outer joint includes a plurality of unit members arranged around the first inner joint and the second inner joint, and the unit member includes a standard unit member and a closed unit member. The standard unit member includes an engaging convex portion at an end portion on the first inner joint side and an end portion on the second inner joint side, and the first inner joint and the second inner joint include An engagement recess for engaging the engagement protrusion to prevent the standard unit member from falling off. In addition, at least a part of the wall surface constituting the engagement recess is provided with a notch portion through which the engagement protrusion of the standard unit member can be inserted to a position corresponding to the engagement recess, and the closing unit member Is not provided with the engaging convex portion, and is configured to be flush with the outer peripheral surface around the notch when arranged in the notch, and at least the first inner joint or the second inner The joint includes a fixing mechanism for fixing the closing unit member, and the retaining mechanism is either one of the outer circumference of the first inner joint and the second inner joint and the inner circumference of the outer joint. And an engaged portion with which the engaging portion engages, and the rotation preventing mechanism includes the closing unit member and the notch portion. The joint portion is comprised of the outer joint. Preferably it is arranged in serial standard unit member.

The closing unit member of the outer joint is disposed in the cutout portion of the first inner joint and the second inner joint. When the joint portion is disposed on the closing unit member, the rigidity is low in the notch portion where the closing unit member having the joint portion is disposed. That is, the closing unit member is a low rigidity portion.
Therefore, the joint is provided on the standard unit member.
By preventing the closing unit member and the joint from overlapping each other along the longitudinal direction of the straight seam steel pipe, it is possible to prevent a part of the joint mechanism from becoming too rigid compared to the other parts.

  In the present invention, the notch is composed of a first notch provided in the first inner joint and a second notch provided in the second inner joint, the first inner joint and the The second inner joint is fitted to each other when the first inner joint provided on one pipe and the second inner joint provided on the other pipe are adjacent to each other. It is preferable that a positioning mechanism for positioning the notch and the second notch at positions facing each other along the longitudinal direction of the steel pipe is provided.

  According to the above-described configuration, when connecting adjacent pipe bodies, the first notch portion and the second notch portion can be easily positioned so as to face each other along the longitudinal direction of the steel pipe by the positioning mechanism.

  In the present invention, it is preferable that the positioning mechanism includes a hole provided on each of the opposing surfaces of the first inner joint and the second inner joint, and a positioning pin inserted through the hole. .

  According to the above-described configuration, reliable positioning is achieved by a simple configuration such as a hole provided on each of the opposing surfaces of the first inner joint and the second inner joint and a positioning pin inserted through the hole. It can be realized at low cost.

  In the present invention, the engaged portion is an outward circumferential groove provided on the outer periphery of each of the first inner joint and the second inner joint, and the engaging portion is an inner periphery of the outer joint. It is preferable that it is an inward key part engaged with the said outward surrounding groove | channel provided in.

  According to the above-described configuration, since the inward key portion and the outward circumferential groove are engaged with each other, the key member is previously incorporated in the inward circumferential groove as in the conventional joint mechanism. Since it is not necessary, the thickness of the outer joint can be reduced, and the material cost can be reduced. Moreover, since the first inner joint and the second inner joint can be configured in the same shape, the processing cost can be reduced.

  In the present invention, the engaging part is an outward key part provided on the outer periphery of each of the first inner joint and the second inner joint, and the engaged part is an inner periphery of the outer joint. It is preferable that it is an inward circumferential groove with which the outward key portion is provided.

  According to the above-described configuration, since the outward key portion and the inward circumferential groove are engaged, the key member is previously incorporated in the inward circumferential groove as in the conventional joint mechanism. Since it is not necessary, the thickness of the outer joint can be reduced, and the material cost can be reduced. Moreover, since the first inner joint and the second inner joint can be configured in the same shape, the processing cost can be reduced.

  In this invention, the said connection part is provided in one pipe body among the 1st inner side joint provided in the one end of the said pipe body, the 2nd inner side joint provided in the other end, and an adjacent pipe body. An outer joint that is provided so as to straddle the first inner joint and the second inner joint in a state in which the first inner joint and the second inner joint provided on the other pipe body are adjacent to each other. An outer circumferential groove is provided on the outer periphery of each of the first inner joint and the second inner joint, and the inner periphery of the outer joint is provided with the first inner joint and the second inner joint. An inward circumferential groove facing the outward circumferential groove provided on each outer periphery is provided, and a key member that engages with a key groove constituted by the outward circumferential groove and the inward circumferential groove is provided. The outer joint includes an opening through which the key member can be inserted into the key groove. The key member includes a plurality of split key members constituting a part of a ring, and a closing member having a function of the split key member and a function of closing the opening, A fixing mechanism for fixing the first inner joint or the second inner joint after being inserted into the opening; and the retaining mechanism includes the outward circumferential groove, the inward circumferential groove, and the key. And the anti-rotation mechanism is configured to include the closing member, the opening, and the fixing mechanism, and the joining portion is a position that does not overlap the opening of the outer joint. It is preferable to be disposed in the area.

According to the above-described configuration, the first inner joint provided at one end of one steel pipe and the second inner joint provided at the other end of the other steel pipe are adjacent to each other, and the first inner joint and the second joint are provided. After the outer joint is provided so as to straddle the inner joint, the key member is passed through the opening formed in the outer joint from the outer peripheral surface of the outer joint, the outward circumferential groove and the inward circumferential groove. Can be arranged in a keyway formed from
Similar to the split key member, the opening is provided with a closing member having a function of preventing the adjacent pipes from moving relative to each other in the longitudinal direction of the pipes. It is possible to prevent the split key member from falling out of the opening.
In addition, since the first inner joint and the second inner joint can be configured in the same shape, the processing cost can be reduced.

Of the outer joint, the circumferential portion where the opening is formed is less rigid than the other circumferential portions because the material in that portion is less. In other words, the circumferential portion where the opening is formed is the low rigidity portion.
Then, an opening part is provided in an outer joint so that it may become a position which is not a position which straddles the junction part which a straight seam steel pipe has.
By preventing the circumferential portion where the opening is formed and the joint from overlapping the longitudinal direction of the straight seam steel pipe, some of the outer joints are too stiffer than the others. Can be prevented.

  In this invention, the said connection part is provided in one pipe body among the 1st inner side joint provided in the one end of the said pipe body, the 2nd inner side joint provided in the other end, and an adjacent pipe body. An outer joint that is provided so as to straddle the first inner joint and the second inner joint in a state in which the first inner joint and the second inner joint provided on the other pipe body are adjacent to each other. An outer circumferential groove is provided on the outer periphery of each of the first inner joint and the second inner joint, and the inner periphery of the outer joint is provided with the first inner joint and the second inner joint. An inward circumferential groove facing the outward circumferential groove provided on each outer periphery is provided, and a key member that engages with a key groove constituted by the outward circumferential groove and the inward circumferential groove is provided. The outer joint includes an opening through which the key member can be inserted into the key groove. The key member includes a plurality of split key members constituting a part of a ring, and a closing member having a function of the split key member and a function of closing the opening, A fixing mechanism for fixing the first inner joint or the second inner joint after being inserted into the opening; and the retaining mechanism includes the outward circumferential groove, the inward circumferential groove, and the key. And the anti-rotation mechanism includes the closing member, the opening, and the fixing mechanism, and the joining portion is a position where the closing member is fixed in the inner joint. It is preferable that they are arranged at positions where they do not overlap.

According to the above-described configuration, the first inner joint provided at one end of one steel pipe and the second inner joint provided at the other end of the other steel pipe are adjacent to each other, and the first inner joint and the second joint are provided. After the outer joint is provided so as to straddle the inner joint, the key member is passed through the opening formed in the outer joint from the outer peripheral surface of the outer joint, the outward circumferential groove and the inward circumferential groove. Can be arranged in a keyway formed from
Similar to the split key member, the opening is provided with a closing member having a function of preventing the adjacent pipes from moving relative to each other in the longitudinal direction of the pipes. It is possible to prevent the split key member from falling out of the opening.
In addition, since the first inner joint and the second inner joint can be configured in the same shape, the processing cost can be reduced.

A bolt hole for fixing, for example, a bolt as a fixing mechanism is formed at a position of the inner joint where the closing member is fixed, and the circumferential portion at that position is made of a small amount of material. Rigidity is lower than the direction part. That is, the position where the closing member is fixed in the inner joint is the low rigidity portion.
Then, the position which fixes the said closure member in an inner joint is provided in an inner joint so that it may become a position which does not straddle the junction part which a straight seam steel pipe has.
In the inner joint, the position where the closing member is fixed and the joint do not overlap along the longitudinal direction of the straight seam steel pipe, so that part of the inner joint is too stiffer than the other parts. Can be prevented.

  In this invention, the said connection part is provided in one pipe body among the 1st inner side joint provided in the one end of the said pipe body, the 2nd inner side joint provided in the other end, and an adjacent pipe body. An outer joint that is provided so as to straddle the first inner joint and the second inner joint in a state in which the first inner joint and the second inner joint provided on the other pipe body are adjacent to each other. An outer circumferential groove is provided on the outer periphery of each of the first inner joint and the second inner joint, and the inner periphery of the outer joint is provided with the first inner joint and the second inner joint. An inward circumferential groove facing the outward circumferential groove provided on each outer periphery is provided, and a key member that engages with a key groove constituted by the outward circumferential groove and the inward circumferential groove is provided. The outer joint includes an opening through which the key member can be inserted into the key groove. The key member includes a plurality of split key members constituting a part of a ring, and a closing member having a function of the split key member and a function of closing the opening, A fixing mechanism for fixing the first inner joint or the second inner joint after being inserted into the opening; and the retaining mechanism includes the outward circumferential groove, the inward circumferential groove, and the key. And the anti-rotation mechanism includes the closing member, the opening, and the fixing mechanism, and the joint is formed on the inner joint that forms a rotation suppression keyway. It is preferable that the counterbore part and the counterbore part formed on the outer joint are disposed at a position that does not overlap.

According to the above-described configuration, the first inner joint provided at one end of one steel pipe and the second inner joint provided at the other end of the other steel pipe are adjacent to each other, and the first inner joint and the second joint are provided. After the outer joint is provided so as to straddle the inner joint, the key member is passed through the opening formed in the outer joint from the outer peripheral surface of the outer joint, the outward circumferential groove and the inward circumferential groove. Can be arranged in a keyway formed from
Similar to the split key member, the opening is provided with a closing member having a function of preventing the adjacent pipes from moving relative to each other in the longitudinal direction of the pipes. It is possible to prevent the split key member from falling out of the opening.
In addition, since the first inner joint and the second inner joint can be configured in the same shape, the processing cost can be reduced.

The circumferential portion where the counterbore portion formed on the inner joint and the counterbore portion formed on the outer joint constituting the rotation suppression key groove are formed of other materials in the circumferential direction. Low rigidity compared to the part. That is, the circumferential part in which the counterbore part formed in the said inner joint and the counterbore part formed in the said outer joint which comprise a rotation suppression keyway is a low-rigidity part.
Therefore, the counterbore part formed on the inner joint and the counterbore part formed on the outer joint that constitute the rotation suppression keyway are positioned so that they are not positioned over the joint part of the straight seam steel pipe. Provided on joints and outer joints.
A counterbore part formed in the inner joint constituting the rotation suppression keyway, a circumferential part in which the counterbore part formed in the outer joint and the joint part are formed along the longitudinal direction of the straight seam steel pipe By preventing them from overlapping each other, it is possible to prevent a part of the inner joint and the outer joint from becoming too rigid compared to the other parts.

  In the present invention, the outer joint is preferably composed of a plurality of unit members arranged in parallel around the first inner joint and the second inner joint.

  According to the above-described configuration, the lifting work by a machine such as a crane becomes unnecessary by configuring the outer joint from a plurality of unit members that are large enough to be lifted by a worker, for example. The workability of connecting the steel pipes is improved.

  In the present invention, it is preferable that the plurality of unit members include an opening unit member provided with the opening and a standard unit member not provided with the opening.

  According to the above-described configuration, the opening unit member including the opening through which the key member can be inserted can be disposed at an arbitrary location. That is, the workability is good in that the opening for inserting the key member into the key groove can be arbitrarily set according to the circumstances of the work space at the site.

  In the present invention, the plurality of unit members are provided around the first inner joint and the second inner joint in a state where the first inner joint and the second inner joint are in contact with each other. A reference unit member, and an extended unit member provided around the first inner joint and the second inner joint in a state where the first inner joint and the second inner joint are separated from each other. It is preferable that

  According to the above-described configuration, a part of the outer joint provided around the first inner joint and the second inner joint is configured from the reference unit member, and the other part is configured from the extension unit member. Thus, the axis of the one steel pipe and the axis of the other steel pipe can be inclined.

  That is, when driving the steel pipe into the ground while connecting the steel pipe up and down, when the attitude of the steel pipe previously driven into the ground is out of a predetermined attitude, for example, a vertical attitude, the axes are relatively inclined, Adjacent pipes can be connected while correcting the posture of the subsequent steel pipe connected to the steel pipe to a predetermined posture, for example, a posture close to a vertical posture.

  In the present invention, each of the first inner joint and the second inner joint includes a base portion and an inner fitting portion extending to the base portion, and an engagement recess is formed on an end surface of the base portion facing the inner fitting portion. Is provided in an annular shape, and the outward circumferential groove is provided in an annular shape on the outer periphery of the inner fitting portion, and the reference unit member and the extension unit are provided on upper and lower ends of the reference unit member and the extension unit member, respectively. The reference unit member and the extension unit member are provided with a pair of engaging convex portions that can be engaged with the engaging concave portion when the member is provided so as to straddle the first inner joint and the second inner joint. A pair of inward circumferential grooves facing the pair of outward circumferential grooves, and a distance between the pair of inward circumferential grooves of the reference unit member is determined between the first inner joint and the first Same as the distance between the pair of outward circumferential grooves when the two inner joints are in contact The distance between the pair of inward circumferential grooves of the extension unit member is the same as the distance between the pair of outward circumferential grooves when the first inner joint and the second inner joint are separated from each other. It is preferable that the distance is set.

  According to the above-described configuration, when the reference unit member and the extension unit member are provided around the first inner joint and the second inner joint, the engagement convex portion and the engagement concave portion are engaged. This prevents the reference unit member and the extension unit member from falling off. Even when the axis of the one steel pipe and the axis of the other steel pipe are inclined, the key member can be inserted into the key groove.

  In the present invention, the connecting portion is formed with one of the connecting portions provided at both ends of the tubular body as a cylindrical portion, and the other is formed as a shaft portion that can be fitted into the cylindrical portion, Adjacent pipes are formed so that they can be fitted together, an inward groove is formed on the inner peripheral surface of the cylindrical portion, and an outward groove is formed on the outer peripheral surface of the shaft. The cylindrical portion inner peripheral surface portion fitted to the inner circumferential surface portion is formed to face the inward groove portion, and the retaining mechanism is fitted in a state straddling the inward groove portion and the outward groove portion facing each other. A key member is provided to connect the tubular portion and the shaft portion of the adjacent tubular bodies fitted to each other in a retaining state, and the anti-rotation mechanism includes any one of the tubular portion and the shaft portion. A concave portion is formed on one or both of the cylindrical portion and the shaft portion of the adjacent tubular bodies. Are fitted and connected to each other, and provided with a fitting key member that prevents relative rotation around the axis of the connected pipes. It is preferable that the portion and the shaft portion are disposed at positions that do not overlap with the concave portion.

According to the above-described configuration, the connecting portion is formed so that adjacent ones can be fitted to each other, and a retaining mechanism that allows the adjacent tubular bodies to be connected to each other in a retaining state, and a shaft between the connected tubular bodies. Since the anti-rotation mechanism for preventing relative rotation around the center is provided in the connecting portion, it is possible to connect the adjacent tubular bodies while preventing relative rotation between them.
That is, the pipes facing each other are connected by the retaining mechanism, and in the construction method in which the pipes are set by rotational press-fitting, even if the pipes are rotated in the reverse direction, relative rotation between the tubular bodies is prevented by the rotation preventing mechanism. Can be prevented.
As a result, it has become possible to use it for the Nakabori method, the soil cement synthetic pile method, the rotary buried pile method, etc., in which the tube is rotated and pressed while excavating with an auger inserted into the tube.

Further, one of the connecting portions provided at both ends of the tubular body is formed in a cylindrical portion, and the other is formed in a shaft portion that can be fitted into the cylindrical portion, and the cylindrical inner peripheral surface portion of the cylindrical portion In addition, an inward groove portion is formed, and an outward groove portion is formed on the outer peripheral surface portion of the shaft portion of the shaft portion so as to face the inward groove portion of the inner peripheral surface portion of the cylindrical portion fitted to the outer peripheral surface portion of the shaft portion. A key member that is fitted in a state straddling the inward groove portion and the outward groove portion facing each other and that connects the tubular portion and the shaft portion of the adjacent tubular bodies fitted to each other in a retaining state. Thus, since the retaining mechanism is configured, it is possible to improve the workability of the pipe connection work.
That is, by simply fitting the key member into a state straddling the inward groove portion and the outward groove portion facing each other, by fitting the tube portion and the shaft portion of the tubular body adjacent in the axial direction of the tubular body, Adjacent pipes can be connected to each other in a retaining state.
As a result, it is possible to improve the workability of the connection work between the pipes as compared with the structure in which the pipes are connected by welding or screw joints, and the work time for connecting the pipes can be shortened. I can do it now.

Further, a recess is formed in one or both of the tube portion and the shaft portion, and the tube portion and the shaft portion of the adjacent tubular body are fitted and connected to each other, and are fitted into the recess. In addition, since the anti-rotation mechanism is configured by providing a fitting key member that prevents relative rotation around the axes of the connected pipes, the relative rotation around the axes of the connected pipes can be achieved by a simple operation. It became possible to prevent rotation.
In other words, for example, if the pipe ends of adjacent pipes are welded together and their relative rotation is prevented, the welding operation takes a lot of time and the quality of the welded part depends on the weather. In addition, a skilled welder is required. However, in the present case, for example, when the cylindrical portion and the shaft portion facing each other are fitted and connected, the cylindrical portion and the shaft portion face each other. When a configuration is adopted in which a cylindrical recess and a shaft recess are respectively formed at positions, and the fitting key member is fitted in a state straddling the cylindrical recess and the shaft recess, the cylinder and the shaft are When fitting and connecting, adjacent pipes are fitted by a simple operation of fitting so that both the concave portions are opposed to each other, and fitting and fixing the fitting key member so as to straddle both the concave portions. Relative rotation around the axis of the body can be prevented.
Further, when the concave portion is formed in one of the cylindrical portion and the shaft portion, and the fitting key member that fits into the concave portion is provided on the other side, the cylindrical portion and the shaft portion are fitted and connected to each other. When adopting a configuration in which the fitting key member is fitted in the recess, the tube portion and the shaft portion are moved while the pipes are moved in the axial direction and the opposing position of the fitting key member is aligned with the recess. The relative rotation around the axial center of the adjacent tubes can be prevented only by performing a fitting operation for fitting the two.
As a result, a non-skilled person can easily perform the setting operation of the rotation prevention mechanism necessary for preventing the relative rotation of the pipes, so that the workability can be improved.

Of the cylindrical portion and the shaft portion, the circumferential portion in which the concave portion is formed has a lower rigidity than the other circumferential portions because there is less material at that portion. That is, the circumferential portion where the recess is formed is a low rigidity portion.
Then, a recessed part is provided in a cylinder part and an axial part so that it may become a position which is not a position which straddles the junction part which a straight seam steel pipe has.
By preventing the circumferential part where the recess is formed and the joint part from overlapping each other along the longitudinal direction of the straight seam steel pipe, the cylinder part and the shaft part are partly less rigid than the other parts. It can be prevented from being too much.

  In the present invention, a retaining mechanism capable of freely connecting adjacent tubular bodies to each other in a retaining state and a rotation preventing mechanism for preventing relative rotation around the axis of the connected tubular bodies are formed of the same member. It is preferable.

According to the above-described configuration, the retaining member that can freely connect adjacent tubular bodies to each other in a retaining state and the rotation preventing mechanism that prevents relative rotation around the axis of the connected tubular bodies are formed of the same member. As a result, it is possible to simultaneously perform a connecting operation for connecting adjacent tube bodies to each other so as to prevent them from coming off and a rotation preventing operation for preventing relative rotation of the tubes in the axial direction.
That is, since the tubular body retaining mechanism and the rotation preventing mechanism are formed of the same member, the tubular body retaining mechanism and the tubular body retaining mechanism facing each tubular body connecting portion adjacent to each other in the axial direction. By simply attaching a member integrally formed with the anti-rotation mechanism, adjacent pipe bodies can be connected to each other in a state of preventing them from coming off, and relative rotation in the axial direction can be prevented.
As a result, adjacent tube bodies are connected to each other in a retaining state, and the work time required to prevent relative rotation around the axis of the tube bodies can be shortened, so that work efficiency can be improved. became.

Explanatory drawing of the joint mechanism of the steel pipe by 1st embodiment of this invention Illustration of inner joint Side cross section of inner joint Explanatory drawing about engagement of steel pipe pile by unit member Side sectional view about engagement of steel pipe pile by unit member Explanatory drawing about engagement of steel pipe pile by unit member Side sectional view about engagement of steel pipe pile by unit member Plan view of the engagement of steel pipe piles by unit members Explanatory drawing about notch closure Side cross-sectional view of notch closure Flat cross-sectional view of notch closure Explanatory drawing of the joint mechanism of the steel pipe by 2nd embodiment of this invention Perspective view of outer joint Illustration of inner and outer joints Illustration of inner and outer joints Illustration of inner and outer joints Side sectional view of inner and outer joints Explanatory drawing about engagement by key member Side sectional view of engagement by key member Plan view of engagement with key member Explanatory drawing about closure member Side sectional view of the closure Cross section of the closing member Illustration of how to use the joint mechanism The perspective view of the outside joint by another mode The perspective view of the outside joint by another mode Plan sectional view of the main part of the outer joint according to another aspect Plan sectional view of the main part of the outer joint according to another aspect The perspective view of the outside joint by another mode Side sectional view of the main part of the outer joint according to another aspect Side sectional view of the main part of the outer joint according to another aspect Side sectional view of the main part of the outer joint according to another aspect Half cut side view showing a third embodiment of the present invention Half sectional plan view of the line XXXIV-XXXIV in FIG. Half sectional plan view of line XXXV-XXXV in FIG. Half sectional side view showing the upper and lower tubes separated from each other Enlarged side sectional view of the engagement part with the arc key Half cut side view showing the second mode of the third embodiment Half cut side view showing the third aspect of the third embodiment Explanatory drawing which shows the 4th aspect of 3rd embodiment. Explanatory drawing which shows the 5th aspect of 3rd embodiment. Explanatory drawing which shows the 6th aspect of 3rd embodiment. Explanatory drawing which shows the deformation | transformation of the 6th aspect of 3rd embodiment. Explanatory drawing which shows the 7th aspect of 3rd embodiment. Explanatory drawing which shows the 8th aspect of 3rd embodiment. Explanatory drawing which shows the 9th aspect of 3rd embodiment. Explanatory drawing which shows the 10th aspect of 3rd embodiment. Explanatory drawing which shows the 11th aspect of 3rd embodiment.

Below, the steel pipe pile by this invention is demonstrated.
First, a first embodiment of a steel pipe pile according to the present invention will be described based on the drawings.
FIG. 1 shows a steel pipe pile 1 having a cylindrical outer peripheral surface shape that is driven into the ground by a hydraulic hammer, a press-fitting machine, a rotary press-fitting machine or the like as an example of a steel pipe pile. In addition, although all the steel pipe piles 1 are the same structures, about the place which needs to distinguish and explain one steel pipe pile 1 and the other steel pipe pile 1 among the adjacent steel pipe piles 1, one steel pipe pile The subscript A is attached to the reference numerals of the components on the 1 side, and the subscript B is attached to the reference numerals of the components on the other side of the steel pipe pile 1.

  The steel pipe pile 1 (1A, 1B) is formed by concentrically welding inner joints 10 formed of straight seam steel pipes at both ends of the pipe body 2 (2A, 2B). The inner joint 10 welded to both ends of the pipe body 2 (2A, 2B) has the same configuration, but is attached to each configuration on the inner joint 10 side located below when the steel pipe pile 1 is driven into the ground. A letter A is attached, and a subscript B is added to each component on the inner joint 10 side located on the upper side. That is, one of the pair of inner joints 10A and 10B is the first inner joint, and the other is the second inner joint. By setting the first inner joint and the second inner joint to the same configuration, the manufacturing cost can be reduced as compared with the case of using another configuration.

As shown in FIG. 2, in the inner joint 10, an inner fitting portion 12 having an outer diameter smaller than that of the base portion 11 is extended to a base portion 11 having an outer diameter slightly larger than the outer diameter of the tube body 2. In the present embodiment, the outer diameter of the base 11 is about 18 mm larger than the outer diameter of the tube body 2.
On the outer periphery of the inner fitting portion 12, a single outward circumferential groove 13 for engaging an inward key portion 23 described later is formed in an annular shape. On the end surface facing the inner fitting portion 12 side of the base portion 11, an engagement concave portion 14 for engaging an engagement convex portion 24 provided at an end portion of the outer joint 20 described later is formed in an annular shape ( (See FIG. 1).

  As shown in FIG. 1, the wall surface which comprises the engagement recessed part 14 is provided with the notch part 15 in four places at equal intervals in the circumferential direction in this embodiment.

In the inner joint 10A and the inner joint 10B, a hole 18 is formed at a predetermined position on the contact surface. A positioning pin 19 is inserted into the hole 18.
As shown in FIG. 3, when connecting the inner joint 10A and the inner joint 10B, the positioning pin 19 is connected to the hole 18A formed in the inner joint 10A and the hole 18B formed in the inner joint 10B. By inserting, the notch 15A provided in the inner joint 10A and the notch 15B provided in the inner joint 10B are positioned at positions facing the longitudinal direction of the steel pipe pile 1.

  As shown in FIG. 1, the outer joint 20 divides a straight seam steel pipe having an outer diameter slightly larger than the outer diameter of the tubular body 2 and an inner diameter large enough to fit the inner joint 10 into the circumferential direction. It is comprised from the eight unit members 21 formed by dividing | segmenting into. In the present embodiment, the outer diameter of the outer joint 20 is about 18 mm larger than the outer diameter of the tube body 2.

  Note that eight equal parts are examples, and the number of unit members 21 obtained by the division may be less than or greater than eight, but the size of each of the divided unit members 21 is determined by the operator's hands. It is preferable that the size is such that it can be lifted up. Further, the unit member 21 can be manufactured at a lower cost by using a simple manufacturing method in which straight seam steel pipes are divided, compared to a case where the unit members 21 are manufactured one by one, for example, by bending an iron plate.

  The inner periphery of the outer joint 20 composed of eight unit members 21 can be engaged with outward circumferential grooves 13 (13A, 13B) provided in the inner joint 10A and the inner joint 10B, respectively. When two parallel circular inward key portions 23 (23A, 23B) are in a state in which the outer joint 20 is provided around the inner fitting portion 12 (12A, 12B) of the inner joint 10 (10A, 10B). Are provided at positions that can be engaged with the outward circumferential grooves 13 (13A, 13B).

  Of the unit members 21, four unit members 21 are formed with engaging convex portions 24 at the upper and lower ends in the drawing. These unit members 21 are standard unit members 21A. The standard unit member 21 </ b> A is engaged with the inward key portion 23 through the notch 15 so as to be engaged with the outward circumferential groove 13 of the inner joint 10, and then is slid along the circumferential direction. The mating convex portion 24 and the engaging concave portion 14 are engaged to prevent the standard unit member 21A from dropping outward.

  The remaining four unit members 21 are not provided with the engaging projections 24, but are shaped so as to be flush with the outer peripheral surface around the notches 15 when arranged in the notches 15. These unit members 21 are closed unit members 21B. Unlike the standard unit member 21A, the closing unit member 21B is not provided with an engagement convex portion 24 that engages with the engagement concave portion 14 of the inner joint 10, but has an opening through which a bolt can be inserted. Bolt holes 16 (16A, 16B) are formed in the first inner joint 20A and the second inner joint 20B at positions corresponding to the openings. The closing unit member 21B can be fixed to the first inner joint 20A and the second inner joint 20B by using a bolt 33 as a fixing mechanism.

  By fixing the closing unit member 21B to the first inner joint 20A and the second inner joint 20B using the bolt 33, the relative movement in the circumferential direction between the inner joint 10A and the inner joint 10B connected via the outer joint 20 is achieved. Is also suppressed.

  In this embodiment, the outward circumferential groove 13 (13A, 13B) as an engaging portion provided in the inner joint 10A and the inner joint 10B, and an inward key as an engaged portion provided in the outer joint 20 The part 23 (23A, 23B) constitutes a retaining mechanism. Further, the closing unit member 21B and the notches 15A and 15B constitute a rotation preventing mechanism.

  In the present embodiment, four standard unit members 21 </ b> A and four closed unit members 21 </ b> B are alternately arranged around the inner joint 10 to constitute a cylindrical outer joint 20. In the present embodiment, the inner joint 10A, the inner joint 10B, and the outer joint 20 constitute a connection portion.

  As described above, the inner joint 10 and the outer joint 20 are formed of straight seam steel pipes. In addition, the pipe body 2 can be formed from a spiral steel pipe, for example.

  The straight seam steel pipe is manufactured using a plate winding method in which a flat steel plate is formed into a cylindrical shape using a huge roll or press, and the joint 3 is welded from the inner and outer surfaces. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the inner joint 10 and the outer joint 20 from straight seam steel pipes, the inner joint 10 and the outer joint 20 can be obtained at low cost.

However, straight seam steel pipes have joints 3 along the longitudinal direction thereof, and are not homogeneous in the circumferential direction like seamless steel pipes, so the same rigidity cannot be obtained in the circumferential direction, and they are vulnerable to internal pressure and torsion.
Moreover, since the circumferential direction part in which notch part 15A, 15B is formed among the inner joint 10A and the inner joint 10B has few materials in the location, rigidity is low compared with another circumferential direction part. That is, the circumferential portion where the notches 15A and 15B are formed is a low rigidity portion.
Then, the circumferential direction part in which the notches 15A and 15B are formed is provided in the inner joint 10A and the inner joint 10B so as to be a position that does not straddle the joint 3 that the straight seam steel pipe has.
By preventing the circumferential portion where the notches 15A and 15B are formed and the joint 3 from overlapping each other along the longitudinal direction of the straight seam steel pipe, a part of the inner joint 10A and the inner joint 10B is partially It can prevent that rigidity becomes too low rather than a part.

  In addition, it is preferable that the inner joint 10 </ b> A and the inner joint 10 </ b> B are coupled so that the respective joint portions 3 do not overlap along the longitudinal direction of the steel pipe pile 1.

Further, the closing unit member 21B of the outer joint 20 is disposed in the notches 15A and 15B of the inner joint 10A and the inner joint 10B. When the joint portion 3 is disposed on the closing unit member 21B, the rigidity is low in the cutout portions 15A and 15B where the closing unit member 21B having the joint portion 3 is disposed. That is, the closing unit member 21B is a low rigidity portion.
Therefore, the joint 3 is provided on the standard unit member 21A.
By preventing the closing unit member 21B and the joint portion 3 from overlapping each other along the longitudinal direction of the straight seam steel pipe, it is possible to prevent a part of the joint mechanism from becoming too rigid compared to the other parts.

  In addition, in the standard unit member 21A having the joint portion 3 among the plurality of standard unit members 21A, the joint portion 3 of the inner joint 10A and the inner joint 10B is disposed with respect to the inner joint 10A and the inner joint 10. It is preferable to be provided at a position other than the position.

  Next, based on FIG. 2 to FIG. 11, a connection method for connecting the subsequent steel pipe pile 1 </ b> B to the steel pipe pile 1 </ b> A previously driven in the method of driving into the ground using a hydraulic hammer or the like will be described.

The above-mentioned joint mechanism is used for a connecting method for connecting the adjacent steel pipe piles 1A and 1B.
First, as shown in FIGS. 1, 2 and 3, the inner joint 10B provided at the lower end abuts the inner joint 10A provided at the upper end of one steel pipe pile 1A which has been driven in advance. Thus, the steel pipe pile 1B is suspended. At this time, the positioning pin 19 is inserted in advance into the hole 18A formed in the inner joint 10A, and the steel pipe pile 1B is positioned in the hole 18B formed in the inner joint 10B using a machine such as a crane. Suspend while confirming that 19 is inserted.

  Next, as shown in FIG. 4 and FIG. 5, the inward key portion 23 (23A, 23B) of the standard unit member 21A is cut out of the inner joint 10 (10A, 10B) through the notches 15A, 15B. Circumferentially engages with the circumferential groove 13 (13A, 13B).

  Then, as shown in FIGS. 6, 7, and 8, the standard unit member 21 </ b> A is slid along the circumferential direction to a position where the engaging convex portion 24 and the engaging concave portion 14 are engaged.

  Next, as shown in FIG. 9 and FIG. 10, the inward key portion 23 (23A, 23B) of the closing unit member 21B is provided outside the inner joint 10 (10A, 10B) through the notches 15A, 15B. Circumferentially engages with the circumferential groove 13 (13A, 13B).

  Finally, as shown in FIGS. 10 and 11, the adjacent steel pipe piles 1 </ b> A, 1 </ b> B are fixed to the steel pipe pile 1 by fixing the closing unit member 21 </ b> B to the inner joint 10 (10 </ b> A, 10 </ b> B) using the bolt 33. It can be connected so that it does not move relative to the longitudinal direction and does not move relative to the circumferential direction.

  In the above description, as the configuration for engaging the inner joint 10A and the inner joint 10B with the outer joint 20, the outward circumferential groove 13 as the engaged portion is formed on the outer periphery of each of the inner joint 10A and the inner joint 10B. Although the structure provided with the inward key part 23 as an engaging part on the inner periphery of the outer joint has been described, the outward key provided on the outer periphery of each of the inner joint 10A and the inner joint 10B. The steel pipe piles 1 </ b> A and 1 </ b> B move relative to each other in the longitudinal direction of the steel pipe pile 1 by the engagement of the outward key part provided on the inner periphery of the outer joint 20. An inward circumferential groove may be used to prevent this.

Next, 2nd embodiment of the steel pipe pile by this invention is described based on drawing.
FIG. 12 shows a steel pipe pile 101 having an outer peripheral surface shape that is driven into the ground using a hydraulic hammer, a press-fitting machine, a rotary press-fitting machine, etc. as an example of a steel pipe. In addition, although all the steel pipe piles 101 are the same structures, about the place which needs to distinguish and explain one steel pipe pile 101 and the other steel pipe pile 101 among the adjacent steel pipe piles 101, one steel pipe pile is shown. The subscript A is attached to the reference numerals of the respective components on the 101 side, and the subscript B is attached to the reference numerals of the respective components on the other steel pipe pile 101 side.

  The steel pipe pile 101 (101A, 101B) is constructed by concentrically welding inner joints 110 formed of straight seam steel pipes at both ends of the pipe body 102 (102A, 102B).

As shown in FIG. 12, in the inner joint 110, an inner fitting portion 112 having an outer diameter smaller than that of the base portion 111 is extended to a base portion 111 having an outer diameter slightly larger than the outer diameter of the tube body 102. In the present embodiment, the outer diameter of the base 111 is larger than the outer diameter of the tubular body 102 by about 18 mm.
On the outer periphery of the inner fitting portion 112, a single outwardly extending circumferential groove 113 for engaging an annular key member 130 described later is formed in an annular shape. An engagement recess 114 for engaging an engagement projection 124 provided at an end of the outer joint 120 described later is formed in an annular shape on the end surface of the base 111 facing the inner fitting portion 112.

  The inner joint 110 welded to both ends of the pipe body 102 has the same configuration, but the subscript A is added to each configuration on the inner joint 110 side located below when the steel pipe pile 101 is driven into the ground. A subscript B is added to each component on the inner joint 110 side located on the upper side. That is, one of the pair of inner joints 110A and 110B is the first inner joint, and the other is the second inner joint. By setting the first inner joint and the second inner joint to the same configuration, the manufacturing cost can be reduced as compared with the case of using different configurations.

  As shown in FIGS. 12 and 13, the outer joint 120 is a straight seam steel pipe having an outer diameter slightly larger than the outer diameter of the tubular body 102 and an inner diameter large enough to fit the inner joint 110 in the circumferential direction. It is composed of eight unit members 121 formed by dividing into eight equal parts. In the present embodiment, the outer diameter of the outer joint 120 is about 18 mm larger than the outer diameter of the tubular body 102.

  Note that eight equal parts are examples, and the number of unit members 121 obtained by division may be smaller or larger than eight, but the size of each divided unit member 121 is determined by the operator's hand. It is preferable that the size is such that it can be lifted up. Further, the unit member 121 can be manufactured at a lower cost by using a simple manufacturing method in which a straight seam steel pipe is divided, for example, by bending an iron plate one by one.

  In the inner periphery of the outer joint 120 composed of eight unit members 121, the outer joint 120A and the inner joint 110B have the same depth as the outward circumferential grooves 113 (113A, 113B) provided in the inner joint 110B, When two parallel circular inward circumferential grooves 123 (123A, 123B) are in a state in which the outer joint 120 is provided around the inner fitting portion 112 (112A, 112B) of the inner joint 110 (110A, 110B). Are provided at positions that can face the outward circumferential groove 113 (113A, 113B).

  In a state where the outer joint 120 is provided around the inner joint 110, an annular space formed by the outward circumferential groove 113 and the inward circumferential groove 123 serves as a key groove for fitting the key member 130.

  By engaging the key member 130 in this key groove, that is, across the outward circumferential groove 113 and the inward circumferential groove 123, the inner joint 110A and the outer joint 120, and the inner joint 110B and the outer joint 120 are mutually connected. The adjacent steel pipe piles 101 </ b> A and 101 </ b> B are connected in the longitudinal direction of the steel pipe pile 101. Therefore, in this embodiment, the outward circumferential groove 113 (113A, 113B) provided in the inner joint 110A and the inner joint 110B, the inward circumferential groove 123 (123A, 123B) provided in the outer joint 120, the key The member 130 constitutes a retaining mechanism.

  Each unit member 121 is formed with engaging convex portions 124 (124A, 124B) at upper and lower ends in the drawing. When the unit member 121 is provided around the inner joint 110, the engagement protrusions 124 (124A, 124B) engage with the engagement recesses 114 (114A, 114B) of the inner joint 110, so that the unit member 121 is removed from the outer side. Is prevented from falling off.

  Of the eight unit members 121, the four unit members 121 include the key member 130 from the outward circumferential groove 113 and the inward circumferential groove 123 in a state where the outer joint 120 is provided around the inner joint 110. In order to arrange in the key groove to be configured, a part of the outward circumferential groove 113 (113A, 113B) in the longitudinal direction is exposed outward over the entire width of the outward circumferential groove 113 (113A, 13B). Two openings 122 (122A, 122B) are provided. These unit members 121 are opening unit members 121A.

  The opening 122 (122A, 122B) is configured in a shape that is cut out over the entire width of the inward circumferential groove 123 (123A, 123B) along the location where each inward circumferential groove 123 (123A, 123B) is formed. Yes.

  Through the opening 122 (22A, 22B), the key member 130 is inserted from the outer peripheral surface of the outer joint 120 into a key groove constituted by the outward circumferential groove 113 and the inward circumferential groove 123.

  The other four unit members 121 have the same configuration as the opening unit member 121A, except that the opening portions 122 (122A, 122B) are not provided. These unit members 121 are standard unit members 121B.

In the present embodiment, four opening unit members 121A and four standard unit members 121B are arranged alternately around the inner joint 110 to form a cylindrical outer joint 120. Since the opening unit member 121A has the opening 122, the rigidity is lower than that of the standard unit member 121B. Therefore, the rigidity of the outer joint 120 as a whole can be homogenized by alternately arranging the opening unit members 121A and the standard unit members 121B.
In the present embodiment, the inner joint 110A, the inner joint 110B, and the outer joint 120 form a connection portion.

As shown in FIGS. 12 and 23, the key member 130 is a member disposed in the key groove, and has a plurality of arcuate shapes obtained by dividing the annular body into 16 equal parts in the circumferential direction. It consists of members.
However, of the 16 arc-shaped members, 12 are divided key members 131 that are arranged in the key groove and function as the key member 130, and the remaining four have a function as the key member 130 and have an opening portion. The closing member 132 has a function of closing 122.
Twelve divided key members 131 and four closing members 132 are arranged per one keyway, and constitute an annular key member 130 as a whole.

  The split key member 131 is set such that the dimension in the direction along the longitudinal direction of the steel pipe pile 101 is slightly smaller than the dimension in the direction of the opening 122, and the dimension in the direction along the circumferential direction of the steel pipe pile 101 is that of the opening 122. The dimension in the direction along the radial direction of the steel pipe pile 101 is set slightly smaller than the dimension in the direction, and the dimension in the direction of the key groove, that is, the outward circumferential groove 113 and the inward circumferential groove 123 is set slightly smaller. Yes.

  The size of the closing member 132 in the direction along the longitudinal direction of the steel pipe pile 101 is set slightly smaller than the size in the direction of the opening 122, and the dimension in the direction along the circumferential direction of the steel pipe pile 101 is the size of the opening 122. The dimension in the direction along the radial direction of the steel pipe pile 101 is set to be substantially the same as the dimension from the bottom surface of the outward circumferential groove 113 to the surface of the opening 122.

  Further, the closing member 132 is configured to be fixable to the inner joint 110 using a bolt 133 after being inserted into the opening 122. The closing member 132 may be fixed to the outer joint 120.

  Further, a rotation inhibiting key for inhibiting relative movement in the circumferential direction of the inner joint 110A and the inner joint 110B connected via the outer joint 120 is arranged at the boundary between the outer peripheral surfaces of the inner joint 110 and the outer joint 120. It is installed. In the present embodiment, in addition to the closing member 132 and the opening 122, the rotation suppression key constitutes a detent mechanism.

  Although not shown, the rotation suppression key includes a counterbore formed on the outer peripheral surface of the base 111 of the inner joint 110 and a counterbore formed on the outer peripheral surface of the outer joint 120 so as to face the counterbore. And straddle the rotation inhibition keyway. In addition, the dimension and number of the said rotation suppression key and the said spot facing part are suitably set according to the construction method of the steel pipe pile 101. FIG. The rotation suppression key may be formed integrally with one of the inner joint 110 or the outer joint 120, and in this case, a counterbore is formed only on the other.

  The configuration for suppressing the relative movement of the inner joint 110A and the inner joint 110B in the circumferential direction is not limited to the one using the rotation suppression key. For example, the length in the longitudinal direction of the steel pipe pile 101 between the engagement convex portion 124 of at least one unit member among the eight unit members 121 and the engagement concave portion 114 with which the engagement convex portion 124 engages. Further, the configuration may be different from the engagement convex portion 124 of the other unit member 121. In this case, the unit member 121 performs the same function as the rotation suppression key.

  As described above, the inner joint 110 and the outer joint 120 are formed of straight seam steel pipes. The tube body 102 can be formed from, for example, a spiral steel pipe.

  The straight seam steel pipe is manufactured using a plate winding method in which a flat steel plate is formed into a cylindrical shape using a huge roll or press, and the joint 103 is welded from the inner and outer surfaces. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the inner joint 110 and the outer joint 120 from straight seam steel pipes, the inner joint 110 and the outer joint 120 can be obtained at low cost.

  However, since a straight seam steel pipe has a joint 103 along its longitudinal direction and is not homogeneous in the circumferential direction like a seamless steel pipe, the same rigidity cannot be obtained in the circumferential direction and is vulnerable to internal pressure and torsion.

Further, among the opening unit member 121A and the standard unit member 121B constituting the outer joint 120, the opening unit member 121A has a small amount of material in the opening 122, and therefore, the circumferential direction in which the opening 122 is not formed in the opening unit member 121A. The rigidity is lower than that of the portion or the standard unit member 121B. That is, the circumferential portion where the opening 122 is formed is a low rigidity portion.
Therefore, the joint portion 103 is provided on the standard unit member 121B.

  By preventing the circumferential portion where the opening 122 is formed and the joint portion 103 from overlapping each other along the longitudinal direction of the straight seam steel pipe, a portion of the outer joint 120 is less rigid than the other portions. It can be prevented from becoming too much.

In addition, the outer joint 120 includes an inner joint 110 </ b> A in which the standard unit member 121 </ b> B having the circumferential portion where the opening 122 is formed and the joint portion 103 among the opening unit member 121 </ b> A is connected to the inner joint 110 </ b> A and the inner joint 110. Further, it is preferable that the inner joint 110 </ b> B is provided around the inner joint 110 </ b> B so that it is not at the position where the joint 103 is disposed.
By preventing the circumferential portion of the outer joint 120 having a low rigidity and the circumferential portion having a low rigidity of the inner joint 110A and the inner joint 110B from overlapping each other along the longitudinal direction of the straight seam steel pipe, In the joint mechanism, it is possible to prevent a part from becoming too low in rigidity than the other part.

  In addition, it is preferable that the inner joint 110 </ b> A and the inner joint 110 </ b> B are connected so that the respective joint portions 103 do not overlap along the longitudinal direction of the steel pipe pile 101.

  Next, based on FIG. 14 to FIG. 23, a connection method for connecting the subsequent steel pipe pile 101 </ b> B to the steel pipe pile 101 </ b> A that has been driven in the ground using a hydraulic hammer or the like will be described.

The above-described joint mechanism is used as a connecting method for connecting the adjacent steel pipe piles 101A and 101B.
First, as shown in FIGS. 12 and 14, the engagement protrusions 124 </ b> A (114 </ b> A) are engaged with the engagement recesses 114 </ b> A (114) of the inner joint 110 </ b> A provided at the upper end of one steel pipe pile 101 </ b> A driven in advance. 124), four opening unit members 121A and four standard unit members 121B are alternately arranged in parallel, and as shown in FIG. 4, a cylindrical outer joint 120 is provided around the inner joint 110A. Configure.

  Next, as shown in FIGS. 16 and 17, the other steel pipe pile 101B is suspended from the steel pipe pile 101A, and the engaging convex portion 124B of the opening unit member 121A and the standard unit member 121B constituting the outer joint 120. (124) is engaged with the engaging recess 114B (114) of the inner joint 110B, so that the inner joints 110A, 110B of the adjacent steel pipe piles 101A, 101B are arranged at predetermined positions inside the outer joint 120.

  Next, as shown in FIGS. 18 to 20, the split key member 131 is inserted into the opening 122 of the opening unit member 121A. The split key member 131 inserted into the opening 122 is slid along the longitudinal direction of the key groove. Then, the next split key member 131 is inserted into the opening 122.

  When the insertion of the predetermined number of split key members 131 is completed, as shown in FIGS. 21 to 23, the closing member 132 inserted into the opening 122 is fixed using a bolt 133 to close the opening 122.

  As described above, the adjacent steel pipe piles 101 </ b> A and 101 </ b> B can be connected so as not to relatively move in the longitudinal direction of the steel pipe pile 101.

  Finally, a counterbore portion formed on the outer peripheral surface of the base 111 of the inner joint 110 and the counterbore portion formed on the outer peripheral surface of the outer joint 120 so as to face the counterbore portion. Adjacent steel pipe piles 101 </ b> A and 101 </ b> B are connected so as not to move relative to each other in the circumferential direction of the steel pipe pile 101 by straddling the constructed rotation suppression keyway.

  By the way, by comprising the outer joint 120 of the joint mechanism according to the present invention with the plurality of unit members 121, in addition to reducing the manufacturing cost as described above, there are the following advantages.

The unit member 121 constituting the outer joint 120 is formed by dividing a straight seam steel pipe into eight equal parts in the circumferential direction.
The unit member 121 is provided so that the height in the direction along the longitudinal direction of the steel pipe pile 101 straddles the inner joint 110A and the inner joint 110B in a state where the inner joint 110A and the inner joint 110B are in contact with each other. It may be formed from a straight seam steel pipe having a reference distance, a straight seam steel pipe having a distance slightly longer than the reference distance, for example, about 0.5 mm, or a straight seam steel pipe having a distance about 1.0 mm longer. The unit member 121 formed from a straight seam steel pipe having the reference distance is a reference unit member 121C, and the unit member 121 formed from a straight seam steel pipe having a distance longer than the reference distance is an extension unit member 121D. . The reference unit member 121C and the extension unit member 121D are also the opening unit member 121A if the opening 122 is provided, and are the standard unit member 121B if the opening 122 is not provided.

  At the upper and lower ends of the extension unit member 121D, similar to the reference unit member 121C, when the unit member 121 is provided around the inner joint 110, the engagement for engaging with the engaging recesses 114A and 14B of the inner joint 110 is provided. Joint convex portions 124A and 24B are formed. Similar to the reference unit member 121C, two annular inward circumferential grooves 123 (123A, 123B) are formed on the inner periphery of the extension unit member 121D.

The distance between the pair of inward circumferential grooves 123 (123A, 123B) of the reference unit member 121C is the distance between the pair of outward circumferential grooves 113 (13A, 13B) when the inner joint 110A and the inner joint 110B abut. Is set to the same distance as
The distance between the pair of inward circumferential grooves 123 (123A, 123B) of the extension unit member 121D is between the pair of outward circumferential grooves 113 (13A, 13B) when the inner joint 110A and the inner joint 110B are separated from each other. The same distance is set.
The distance between the inward circumferential grooves 123 (123A, 123B) of the extension unit member 121D is formed to be wider by 0.5 mm or 1.0 mm than the reference distance.
That is, the extension unit member 121D is configured such that the distance between the inward circumferential grooves 123 (123A, 123B) is longer than the distance between the inward circumferential grooves 123 (123A, 123B) of the reference unit member 121C. In addition, the said 0.5 mm and 1.0 mm are illustrations, and an appropriate value is actually set based on the diameter and dimensional tolerance of the steel pipe pile 101. FIG.

When the outer joint 120 is configured from the reference unit member 121C, the opposing surfaces of the inner joint 110A of the steel pipe pile 101A and the inner joint 110B of the steel pipe pile 101B are in contact with each other.
On the other hand, when the outer joint 120 is configured by the extension unit member 121D having a distance 0.5 mm longer than the reference distance, the distance between the opposing surfaces of the inner joint 110A of the steel pipe pile 101A and the inner joint 110B of the steel pipe pile 101B is 0. When the outer joint 120 is constituted by the extension unit member 121D having a gap of 5 mm and having a distance 1.0 mm longer than the reference distance, the opposing surface between the inner joint 110A of the steel pipe pile 101A and the inner joint 110B of the steel pipe pile 101B is formed. A gap of 1.0 mm is generated between them.

  If the outer joint 120 group having different lengths in the longitudinal direction of the steel pipe pile 101 is prepared, for example, as shown in FIG. 24, the posture of the steel pipe pile 101A driven in advance is in the vertical direction. When the steel pipe pile 101B is connected to the steel pipe pile 101A, the reference unit member 121C and the extension unit member 121D are combined, for example, the reference unit member 121C is disposed on the left side in the figure. However, by disposing the extension unit member 121D on the right side in the figure, the posture of the subsequent steel pipe pile 101B can be driven into a posture along the vertical direction. The steel pipe piles 101A and 101B can be connected while being corrected so as to have a posture close to a vertical posture. Since the inward circumferential groove 123 (123A, 123B) is configured with a width having a slight margin with respect to the split key member 131, the key of the split key member 131 can be obtained even when the steel pipe piles 101A, 101B are tilted. Slides along the length of the groove are not disturbed.

  In the above-described embodiment, the opening 122 of the outer joint 120 is provided in the center of the opening unit member 121A. However, the opening 122 is formed between two adjacent unit members 121 as shown in FIG. It may be formed straddling. Further, as shown in FIG. 26, the opening unit member 121 </ b> A may be formed so that the vertical position is different. As shown in FIG. 26, by shifting the formation position of the opening 122 to the left and right, it is possible to suppress a decrease in the rigidity of the opening unit member 121A compared to the case where the opening 122 is formed vertically.

  In the above-described embodiment, the division surface of the unit member 121 constituting the outer joint 120 is configured to be a plane, but as shown in FIGS. 27 and 28, the opposing surfaces of the adjacent unit members 121 are engaged with each other. You may provide an engaging part. It is possible to prevent the unit member 121 from dropping outward by not only engaging the engagement convex portion 124 with the engagement concave portion 114 but also engaging the adjacent unit members 121 with each other.

  In the above-described embodiment, the outer joint 120 is configured by the unit member 121 divided into eight equal parts, but the outer joint 120 may be configured in a cylindrical shape as shown in FIG. In this case, as shown in FIG. 30, the inner joint 110 may not include the engaging recess 114. However, in the operation of connecting the steel pipe pile 101A and the steel pipe pile 101B, a mechanism and operation for holding the outer joint 120 around the inner joint 110 are required until the split key member 131 is inserted into the key groove. .

  In order to solve this point, as shown in FIG. 31, an engagement step 115 for holding the outer joint 120 around the inner joint 110 may be provided at least on the inner joint 110A of the steel pipe pile 101A.

  Further, as shown in FIG. 32, the outer peripheral surface of the outer joint 120 may not be formed to be flush with the outer peripheral surface of the base 111 of the inner joint 110.

Below, 3rd embodiment of the steel pipe pile by this invention is described based on drawing.
33 to 37 show a first aspect of the third embodiment of the steel pipe pile according to the present invention, FIG. 38 shows the second aspect, FIG. 39 shows the third aspect, and FIG. FIG. 41 shows the fifth embodiment, FIG. 42 shows the sixth embodiment, FIG. 43 shows a modification of the sixth embodiment, and FIG. 44 shows the seventh embodiment. FIG. 45 shows the eighth embodiment, FIG. 46 shows the ninth embodiment, and FIG. 47 shows the tenth embodiment.

  First, the first aspect will be described. In FIGS. 33 to 37, 20A1 is an upper tube body, and 20A2 is a lower tube body. The upper tubular body 20A1 is provided with a female tubular portion 201 (an example of a connecting portion) at the lower end coupled to the lower tubular body 20A2 so as to protrude downward by welding 203, and the lower tubular body 20A2 includes A shaft portion 202 (an example of a connecting portion) that protrudes and fits into the cylindrical portion 201 is provided at the upper end coupled to the tubular body 20 </ b> A <b> 1 so as to protrude upward by welding 203.

  The cylindrical portion 201 has a cylindrical shape whose outer diameter is the same as the outer diameter of the upper tubular body 20A1, and the inner periphery thereof is formed on a vertical cylindrical inner peripheral surface portion 204 into which a shaft portion 202 described later is fitted. In addition, a circumferential groove 205 is provided in a step portion 201D formed on the proximal end side of the cylindrical portion 201 in the cylindrical inner peripheral surface portion 204. A plurality of inner groove portions 206 are provided around the cylindrical inner peripheral surface portion 204 at intervals in the vertical direction. In addition, a plurality of cutout portions 207 (an example of the recesses E) are provided at the lower end of the cylindrical portion 201 at intervals in the circumferential direction.

  The shaft portion 202 is formed on the outer peripheral surface portion 210 of the vertical shaft portion that is connected to the cylindrical inner peripheral surface portion 204 of the cylindrical portion 201 following the base shaft portion 208 whose outer diameter is the same as the outer diameter of the lower tube body 20A2. A protrusion 211 that is formed by the insertion portion 209 and that fits with the circumferential groove 205 of the cylindrical portion 201 is provided at the tip end portion 202S of the shaft portion. An outer groove 212 is provided around the shaft outer peripheral surface 210 of the outer periphery of the insertion portion 209 at a position corresponding to the inner groove 206 of the cylindrical portion 201. In addition, a joint recess 213 that joins the tube tip 201S of the tube portion 201 is provided around the upper portion of the base shaft portion 208, and the notch 207 of the tube portion 201 is spaced apart in the circumferential direction. At the corresponding position, a notch 214 (an example of the recess E) having the same thickness as the notch 207 and having a required depth is provided, and a plurality of screw holes 215 are formed in the inner wall of each notch 214. Is provided.

  A plurality of screw holes 216 provided at intervals in the circumferential direction from the outer periphery of the cylindrical portion 201 are communicated with the inner groove portions 206, and the screw holes 216 are provided in the inner groove portions 206. An arc key 218 (an example of a key member) that moves forward and backward from the inside groove 206 to a position straddling the inside groove 6 and the inside groove 6 by the operation of the set bolt 217 that is screwed into the housing is accommodated. Has been. The arc key 218 is advanced and retracted by a set bolt 217 as shown in FIG. The set bolt 217 has a right-handed screw head portion 217a screwed into the screw hole 216 at the base end portion and a tail portion 17b screwed into the left-hand screw (reverse screw) provided on the arc key 218 at the distal end portion. When the set bolt 217 is rotated forward (right) and screwed in, the arc key 218 moves forward, and when rotated backward (left), the arc key 218 moves backward. The structure for moving the arc key 218 back and forth is not limited to this.

  Reference numeral 220 denotes a rotation suppression key (an example of the fitting key member H) for preventing relative rotation between the tube portion 201 of the upper tube body 20A1 and the shaft portion 202 of the lower tube body 20A2. A bolt insertion hole 221 is provided at a position corresponding to the screw hole 215 provided in the notch 214, and is formed in a shape that fits over the part 207 and the notch 214 of the shaft part 202.

  In order to longitudinally connect the upper tube body 20A1 and the lower tube body 20A2, the upper tube body 20A1 is lifted by a crane, carried directly above the lower tube body 20A2, suspended, and the shaft portion 202 is inserted into the tube portion 201. Accordingly, the circumferential groove 205 of the tube portion 201 and the protrusion 211 at the tip of the shaft portion of the shaft portion 202 are joined, and the upper tube body 20A1 and the lower tube body 20A2 are fitted. And the notch part 207 of the cylinder part 201 is made to correspond with the notch part 214 of the axial part 202 by rotation adjustment of upper tube 20A1.

  Thereafter, the rotation inhibiting key 220 is fitted over the notch 207 and the notch 214, and the mounting bolt 222 is screwed into the screw hole 215 and fixed (an example of the rotation prevention mechanism M). Thus, the upper and lower upper tubular bodies 20A1 and 20A2 are coupled so as not to rotate. Subsequently, the set bolt 217 is screwed, and the arc key 218 stored in the inner groove portion 206 is pushed toward the outer groove portion 212 (an example of the retaining mechanism S). As a result, the arc key 218 is engaged across both the grooves 206 and 212 as indicated by the chain line in FIG. 37, and the upper tube body 20A1 and the lower tube body 20A2 are axially centered via the arc key 218. It is impossible to insert and remove in the X direction.

  In the coupling via the arc key 218, the tensile force is transmitted from the one cylindrical portion 201 or the shaft portion 202 to the arc key 218 by the side pressure stress on the side surfaces of both the groove portions 206 and 212 and the arc key 218, and the arc force is applied as the shearing force. Transmitted to the opposite side of the key 218. Then, it is transmitted again to the other cylindrical portion 201 or the shaft portion 202 by the side pressure stress on the side surfaces of the inner and outer groove portions 206 and 212 and the arc key 218. Further, the compressive force is transmitted by the compressive stress on the surface perpendicular to the tube axis of the tube portion 201 and the shaft portion 202.

The cylinder part 201 and the shaft part 202 are formed from a straight seam steel pipe.
The straight seam steel pipe is manufactured using a plate winding method in which a flat steel plate is formed into a cylindrical shape using a huge roll or press, and the joint portion 303 is welded from the inner and outer surfaces. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the cylindrical portion 201 and the shaft portion 202 from a straight seam steel pipe, the cylindrical portion 201 and the shaft portion 202 can be obtained at low cost. The upper tube body 20A1 and the lower tube body 20A2 are preferably formed from spiral steel pipes.

However, straight seam steel pipes have joints 303 along the longitudinal direction thereof, and are not homogeneous in the circumferential direction like seamless steel pipes, so the same rigidity cannot be obtained in the circumferential direction, and they are vulnerable to internal pressure and torsion.
Moreover, since the material in the circumferential direction part in which the notch parts 207 and 214 are formed among the cylinder part 201 and the shaft part 202 is less in the part, the rigidity is lower than the other circumferential direction parts. Furthermore, the circumferential portion where the set bolt 217 of the cylindrical portion 201 is disposed has lower rigidity than the other circumferential portions. That is, the notch portions 207 and 214, that is, the circumferential portion where the recess E is formed and the portion where the set bolt 217 is disposed are the low rigidity portion.
Therefore, the notches 207 and 214 are provided in the cylindrical portion 201 and the shaft portion 202 so as not to be in a position over the joint portion 303 of the straight seam steel pipe. Moreover, the set bolt 217 is provided in the cylinder part 201 and the axial part 202 so that it may become a position which does not overlap with the junction part 303 which a straight seam steel pipe has.
By preventing the notches 207 and 214 and the set bolt 217 and the joint 303 from overlapping with each other along the longitudinal direction of the straight seam steel pipe, a part of the cylindrical part 201 and the shaft part 202 is more rigid than the other parts. Can be prevented from becoming too low.

Next, the second aspect will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in that the shapes of the cylindrical portion 201 and the cylindrical portion inner peripheral surface portion 204 of the shaft portion 202 and the outer peripheral surface portion 210 of the shaft portion are different. 204 is formed in a conical surface 204a that is widened, and the inner peripheral surface of the shaft portion 202 is formed in a tapered conical surface 210a that matches the conical surface 204a. A plurality of inner groove portions 206 and outer groove portions 212 are provided around the conical surfaces 204a and 210a at intervals in the vertical direction.
With the above configuration, unlike the screw-fitting type, the upper tube 20A1 and the lower tube 20A2 are adjacent to each other in the axial direction X without requiring a laborious work of gradually bringing the upper tube 20A1 and the lower tube 20A2 close to each other. Even when the axial position of the cylindrical portion 201 and the axial position of the axial portion 202 are shifted when the shaft portion 202 is inserted into the cylindrical portion 201 of the upper tubular body 20A1 and the lower tubular body 20A2, the conical surfaces 204a, It is possible to guide the cylindrical portion 201 and the shaft portion 202 so as to be fitted concentrically by simply moving them in the axial center X direction while keeping the 210a in contact with each other.
In addition, since it is the same as that of the previous steel pipe pile about the other structure and the point of construction, the description is abbreviate | omitted.

Next, the third aspect will be described. In the steel pipe pile according to this aspect, the shape of the tubular portion inner peripheral surface portion 204 of the tubular portion 201 is formed in the tubular portion inner peripheral surface portion 204b where the shape gradually expands stepwise, and the shape of the shaft portion outer peripheral surface portion 210 of the shaft portion 202 with respect to this. Is formed on the outer peripheral surface portion 210b of the shaft portion, which is tapered step by step, matching the inner peripheral surface portion 204b of the cylinder portion. The cylindrical inner peripheral surface portion 204b and the shaft outer peripheral surface portion 210b are provided with an inner groove portion 206 and an outer groove portion 212 around the vertical surface.
With the above configuration, the cylindrical portion and the shaft portion can be fitted with each other by simply moving them close to each other in the direction of the axis X. At this time, the shapes of the cylindrical portion inner peripheral surface portion 204b and the shaft portion outer peripheral surface portion 210b match each other. Since it is formed in a stepped portion shape, the fitting operation until the corresponding cylindrical portion inner peripheral surface portion 204b and shaft portion outer peripheral surface portion 210b come into contact with each other can be performed without resistance.
Other structures and construction procedures are the same as those in the first aspect and the second aspect, and the description thereof is omitted.

Next, the fourth mode shown in FIG. 40 will be described. It differs from the previous steel pipe pile in that an O-ring 225 is provided, and the cylindrical portion outer peripheral surface portion 201G of the cylindrical portion 201 having the same diameter as the outer diameter of the upper tubular body 20A1 is spaced in the circumferential direction. A plurality of cutout portions 207 (an example of the recesses E) formed by cutting out part of the outer peripheral surface of the cylindrical portion are formed, and a circumferential groove is formed in the step portion 201D formed on the proximal end side of the cylindrical portion in the cylindrical inner peripheral surface portion 204. 205 is provided.
The shaft portion 202 is formed on the outer peripheral surface portion 210 of the vertical shaft portion that engages with the inner peripheral surface portion 204 of the cylindrical portion 201 following the base shaft portion 208 whose outer diameter is the same as the outer diameter of the lower tube body 20A2. In addition to being formed by the fitting insertion portion 209, the shaft tip end portion 202S is provided with a protrusion 211 that fits with the circumferential groove 205 of the cylindrical portion 201. At the upper part of the base shaft portion 208, a joint recess 213 that joins the tube portion tip portion 201S of the tube portion 201 is provided. The joint recess 213 is provided with an O-ring 225. When the cylindrical portion 201 and the shaft portion 202 are fitted, the inward groove portion 206 and the outward groove portion 212 are opposed to each other without being obstructed by the O-ring 225. The O-ring 225 is allowed to be elastically deformed between the cylindrical tip 201S and the joint recess 213 so that the positions can be matched and the engaging operation for engaging the arc key 218 is reliably performed. A space of a size that can surely seal is formed. In addition, the outer peripheral surface of the base shaft portion 208 has a notch having a predetermined depth in the vertical direction at the same thickness as the notch portion 207 at a position corresponding to the notch portion 207 of the cylindrical portion 201 with a space in the circumferential direction. A portion 214 is provided, and a rotation inhibiting key 220 (an example of the fitting key member H) is fitted over the notch 207 and the notch 214, and the mounting bolt 222 is screwed into the screw hole 215 to be fixed.
With the above configuration, relative rotation around the axis X of the upper tube body 20A1 and the lower tube body 20A2 can be prevented, the contact surface between the cylindrical inner peripheral surface portion 204 and the shaft outer peripheral surface portion 210, and inward It is easy to prevent water from entering the groove 206, the outward groove 212, and the arc key 218.
In addition, since it is the same as that of the previous steel pipe pile about the other structure and the point of construction, the description is abbreviate | omitted.
Further, the O-ring 225 may not be provided unless particularly necessary.

Next, the fifth mode shown in FIG. 41 will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in the shape of the detent mechanism M, and the cylindrical outer peripheral surface part 201G of the cylindrical part 201 having the same diameter as the outer diameter of the upper tubular body 20A1 A part of the cylindrical outer peripheral surface part 201G is cut out at intervals in the circumferential direction to form a plurality of cutout concave parts 223 (an example of the concave part E) that open toward the shaft part 202 side of the opposing connecting part B. At the same time, a circumferential groove 205 is provided in a step portion 201D formed on the cylindrical portion proximal end side of the cylindrical portion inner peripheral surface portion 204.
The shaft portion 202 is formed on the outer peripheral surface portion 210 of the vertical shaft portion that engages with the inner peripheral surface portion 204 of the cylindrical portion 201 following the base shaft portion 208 whose outer diameter is the same as the outer diameter of the lower tube body 20A2. In addition to being formed by the fitting insertion portion 209, the shaft tip end portion 202S is provided with a protrusion 211 that fits with the circumferential groove 205 of the cylindrical portion 201. In addition, a joint recess 213 that is joined to the tube tip portion 201S of the tube portion 201 is provided around the upper portion of the base shaft portion 208, and in the circumferential direction of the end surface portion 201T that faces the tube portion 201 in the base shaft portion 208. Engagement protrusions 224 (an example of a fitting key member H) having a shape that fits and engages with the notch recess 223 are formed at positions corresponding to the notch recess 223 formed in the cylindrical portion 201 with an interval. .
Then, when fitting the shaft portion 202 to the tube portion 201, when the fitting operation is performed while the engagement protrusion 224 is positioned at a position facing the notch recess 223, the protrusion 211 provided on the shaft portion distal end portion 202S. Is fitted into the circumferential groove 205, and the cylindrical tip portion 201S is fitted into the joint recess 213, and at the same time, the engagement protrusion 224 is fitted and engaged with the notch recess 223.
With the above configuration, the operation can be performed while visually confirming the engagement state of the engagement protrusion 224 fitted into the notch recess 223, and the upper tube 20A1 and the lower tube 20A2 can be operated only by a fitting operation between the upper tube 20A1 and the lower tube 20A2. Relative rotation around the axis X of the tube body 20A1 and the lower tube body 20A2 can be prevented.
In addition, since it is the same as that of the previous steel pipe pile about the other structure and the point of construction, the description is abbreviate | omitted.

Next, the sixth aspect shown in FIG. 42 will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in the shape of the detent mechanism M, and the cylindrical portion 201 is provided with a ridge 211 around the distal end portion 201S of the cylindrical portion. Are formed with a plurality of engaging protrusions 226 (an example of the fitting key member H) projecting toward the shaft portion 202 side of the connecting portion B facing each other at an interval in the circumferential direction. A circumferential groove 205 is provided in a step portion 201D formed on the base end side of the tube portion.
The shaft portion 202 is formed on the outer peripheral surface portion 210 of the vertical shaft portion that engages with the inner peripheral surface portion 204 of the cylindrical portion 201 following the base shaft portion 208 whose outer diameter is the same as the outer diameter of the upper tubular body 20A1. In addition to being formed by the fitting insertion portion 209, the shaft tip end portion 202S is provided with a protrusion 211 that fits with the circumferential groove 205 of the cylindrical portion 201. In addition, a joint recess 213 that joins the cylindrical tip end portion 201S of the cylindrical portion 201 is provided around the upper portion of the base shaft portion 208, and in the circumferential direction of the end surface portion 202T that faces the cylindrical portion 201 in the basic shaft portion 208. A mortise 227 (an example of the recess E) in which the engagement protrusion 226 is fitted and engaged is formed at a position corresponding to the engagement protrusion 226 formed on the cylindrical portion 201 with a gap.
Then, when the shaft portion 202 is fitted to the tube portion 201, when the fitting operation is performed while the mortise 227 is positioned at a position facing the engagement protrusion 226, the protrusion 211 provided on the tube portion distal end portion 201 </ b> S. Is fitted into the circumferential groove 205, and the cylindrical tip portion 201S is fitted into the joint recess 213. At the same time, the engagement protrusion 226 is fitted and engaged in the mortise 227.
With the above configuration, for example, a joining line formed on the outer peripheral surface as compared with a configuration in which a fitting convex portion and a fitting concave portion are formed on the outer peripheral surface of the cylindrical portion 201 and the shaft portion 202 to prevent rotation. Therefore, intrusion of water can be easily prevented, and the axis X around the upper tube body 20A1 and the lower tube body 20A2 can be obtained only by fitting operation by the close movement of the upper tube body 20A1 and the lower tube body 20A2. Relative rotation in can be prevented.
As shown in FIG. 43, the engaging protrusion 226 is formed integrally with the ridge 211 as in the above embodiment, and the engaging protrusion 226 formed separately is attached with a bolt 228 or the like as shown in FIG. There may be.
In this case, when the engaging protrusion 226 is engaged and engaged with the mortise 227, even if the engaging protrusion 226 is broken and cannot be used due to the contact, the engaging protrusion 226 at that position is replaced with a new one. Can be replaced.
In addition, about the other structure and the point of construction, since it is the same as that of the previous steel pipe pile, the description is abbreviate | omitted.

Next, the seventh aspect shown in FIG. 44 will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in the shape of the detent mechanism M, and the cylindrical portion 201 is provided with a protrusion 211 around the cylindrical portion distal end portion 201S, and an inner peripheral portion of the cylindrical portion. A step groove 201D formed on the base end side of the cylindrical portion in the surface portion 204 is provided with a circumferential groove 205, and is opened toward the tip end side of the cylindrical portion at intervals in the circumferential direction of the inner peripheral surface on the base end side of the cylindrical portion. A plurality of mounting recesses 229 are formed, and an engagement plate member 230 (fitting key member H) is formed in the mounting recess 229 from the stepped portion 201D formed on the base end side of the cylinder portion toward the shaft portion 202 side of the connecting portion B facing the mounting recess 229. 1 example) is protruded.
The shaft portion 202 is formed on the outer peripheral surface portion 210 of the vertical shaft portion that engages with the inner peripheral surface portion 204 of the cylindrical portion 201 following the base shaft portion 208 whose outer diameter is the same as the outer diameter of the upper tubular body 20A1. The joint recess 213 that joins the protrusion 211 of the tube portion tip portion 201S of the tube portion 201 is provided around the upper portion of the base shaft portion 208 and the tube portion 201 in the shaft portion 202 is formed. A notch recess 231 (an example of the recess E) in which the engagement plate member 230 is fitted and engaged at a position facing the engagement plate member 230 attached to the cylindrical portion 201 with an interval in the circumferential direction of the end surface portion 202T that faces the end surface portion 202T. Is formed.
When the shaft portion 202 is fitted to the cylindrical portion 201, when the fitting operation is performed while the notch recess 231 is positioned at a position facing the engagement plate member 230, the protrusion 211 provided on the shaft portion distal end portion 202S. Is fitted into the circumferential groove 205, and the protrusion 211 provided on the cylinder tip 201 S is fitted into the joint recess 213, and at the same time, the engagement plate member 230 is fitted and engaged in the notch recess 231.
With the above configuration, the fitting key member H can be formed simply by attaching the engaging plate member 230 formed separately, so that, for example, as compared with the case where the fitting key member H is formed by a shaving operation. The forming operation for forming the fitting key member H in the cylindrical portion 201 is facilitated, and the upper tubular body 20A1 and the lower tubular body can be formed only by the fitting operation by the close movement of the upper tubular body 20A1 and the lower tubular body 20A2. Relative rotation around the axis X of 20A2 can be prevented.
In addition, about the other structure and the point of construction, since it is the same as that of the previous steel pipe pile, the description is abbreviate | omitted.

Next, an eighth aspect shown in FIG. 45 will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in the shape of the anti-rotation mechanism M. The cylindrical portion 201 includes a step portion 201D formed on the cylindrical base end side of the cylindrical inner peripheral surface portion 204. Is provided with a circumferential groove 205, and a fitting step 204c (of the recess E) formed by a polygonal inner peripheral surface having an inner diameter between the inner diameter of the cylindrical inner peripheral surface portion 204 and the outer diameter of the cylindrical outer peripheral surface portion 201G. An example) is formed on the inner peripheral portion of the cylindrical tip end portion 201S so as to open to the shaft portion 202 side of the opposing connection portion B, and on the end surface portion 201T facing the shaft portion 202 side of the fitting step portion 204c. A ridge 211 is provided around.
The shaft portion 202 is formed with a base shaft portion 208 whose outer diameter is the same as the outer diameter of the upper tubular body 20A1, and a vertical shaft portion outer peripheral surface portion 210 whose outer periphery engages with the cylindrical portion inner peripheral surface portion 204 of the cylindrical portion 201. A fitting insertion portion 209 and a fitting shaft portion 202J (an example of the fitting key member H) are formed. The fitting shaft portion 202J is formed on the upper portion of the base shaft portion 208 in a shape having an outer peripheral shape that fits and engages with a fitting step portion 204c formed on the inner peripheral portion of the cylindrical portion tip portion 201S of the cylindrical portion 201. Has been.
Then, when a fitting operation for fitting the shaft portion 202 to the tube portion 201 is performed, the protrusion 211 formed on the shaft portion distal end portion 202S is fitted to the circumferential groove 205 formed on the proximal end side of the tube portion, and the shaft The protrusion 211 of the cylinder end surface portion 201T is fitted into the joint recess 213 of the end surface portion 202T facing the cylinder portion 201 side of the portion 202, and at the same time, the fitting shaft portion 202J is fitted and engaged in the fitting step portion 204c. The
With the above configuration, the relative rotation around the axis X between the upper tube body 20A1 and the lower tube body 20A2 can be prevented only by the fitting operation by the close movement of the upper tube body 20A1 and the lower tube body 20A2.
In addition, if the shape of the inner peripheral surface of the fitting step portion 204c and the shape of the outer peripheral surface of the fitting shaft portion 202J are made point-symmetric polygonal, the position of the fitting shaft portion 202J facing the fitting step portion 204c Even if they are misaligned and cannot be fitted, they can be fitted and connected by rotating one of the tubes while the fitting shaft portion 202J is in contact with the fitting step portion 204c.
Furthermore, if the shape of the inner peripheral surface of the fitting step portion 204c and the shape of the outer peripheral surface of the fitting shaft portion 202J are asymmetrical polygonal shapes, they can be fitted only at a fixed position, so the upper tubular body 20A1 and This is convenient when the orientations of the lower tubular bodies 20A2 are to be matched.
In addition, about the other structure and the point of construction, since it is the same as that of the previous steel pipe pile, the description is abbreviate | omitted.

Next, the ninth mode shown in FIG. 46 will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in the shape of the detent mechanism M, and the circumferential groove 205 is formed in the stepped portion 201D formed on the base end side of the cylindrical portion in the cylindrical inner peripheral surface portion 204. The cylindrical tip end portion 201S is formed in a stepped shape having an outer peripheral diameter smaller than the outer peripheral diameter on the base end side of the cylindrical portion, and is provided with bolt insertion holes 232 (in a plurality of locations in the circumferential direction of the cylindrical tip end portion 201S. An example of the recess E) is provided.
The shaft portion 202 is formed on the outer peripheral surface portion 210 of the vertical shaft portion that engages with the inner peripheral surface portion 204 of the cylindrical portion 201 following the base shaft portion 208 whose outer diameter is the same as the outer diameter of the upper tubular body 20A1. In addition to being formed by the fitting insertion portion 209, the shaft tip end portion 202S is provided with a protrusion 211 that fits with the circumferential groove 205 of the cylindrical portion 201. In addition, a joint recess 213 that joins the tube tip 201S of the tube portion 201 is provided around the base shaft portion 208, and an inner peripheral surface of the shaft portion sandwiching the joint recess 213 from the outer periphery of the base shaft 208. A plurality of bolt insertion holes 233 extending to the center are formed at positions corresponding to the bolt insertion holes 232 provided in the cylindrical portion distal end portion 201S.
Then, when the shaft portion 202 is fitted to the tube portion 201, the bolt insertion shaft 232 (an example of the recess E) formed in the base shaft portion 208 is replaced with a bolt insertion hole 232 provided in the tube portion distal end portion 201S. When a fitting operation is performed in accordance with the center and a bolt 234 (an example of a fitting key member) is screwed from the insertion hole 232 toward the inner peripheral surface of the shaft part through the insertion hole 233, the bolt 234 is provided on the shaft end part 202S. In addition, the cylindrical portion 201 and the shaft portion 202 can be fitted and connected in a state where the protruding portion 211 is fitted in the circumferential groove 205 and the cylindrical tip portion 201S is fitted in the joint recess 213.
With the above configuration, the bolt 234 can prevent relative rotation of the upper tube body 20A1 and the lower tube body 20A2 around the axis X, and prevents the upper tube body 20A1 and the lower tube body 20A2 from coming off. It also has a function to do.
In addition, since it is the same as that of the previous steel pipe pile about the other structure and the point of construction, the description is abbreviate | omitted.

Next, a tenth aspect shown in FIG. 47 will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in the shape of the detent mechanism M, and the cylindrical inner peripheral surface portion 204 of the cylindrical portion 201 is arranged in the axial center X direction orthogonal to the inward groove portion 206. A plurality of cylindrical key grooves 235 extending are provided, and a plurality of axial key grooves 236 extending in the axial center X direction orthogonal to the outward groove 212 are formed in the cylindrical key grooves 235 on the shaft outer peripheral surface 202G of the shaft 202. The key plate 238 is fitted in one of the key grooves 235 and 236 and is fixed with bolts 237 as necessary. At this time, the thickness of the key plate 238 in the radial direction of the connection portion B is formed so as to protrude in the radial direction by the depth of the opposing key groove from the internally fitted key groove.
Then, when the shaft portion 202 is fitted to the cylinder portion 201, the fitting operation is performed while the other key groove 235 or 236 is positioned at a position facing the key plate 238 fitted inside the key groove 235 or 236. As a result, the key plate 238 is inserted and engaged so as to straddle both the key grooves 235 and 236.
With the above configuration, the relative rotation in the axis X direction between the upper tube body 20A1 and the lower tube body 20A2 can be prevented only by the fitting operation by the close movement of the upper tube body 20A1 and the lower tube body 20A2.
In addition, about the other structure and the point of construction, since it is the same as that of the previous steel pipe pile, the description is abbreviate | omitted.

Next, the eleventh aspect shown in FIG. 48 will be described. The steel pipe pile according to this aspect is different from the previous steel pipe pile in the shapes of the retaining mechanism S and the rotation preventing mechanism M, and the cylindrical portion 201 has the same outer diameter as the outer diameter of the upper tubular body 20A1. The inner periphery is formed in a vertical cylindrical inner peripheral surface portion 204 in which the shaft portion 202 is fitted, and the bolt insertion hole 240 (the recess E of the concave portion E) penetrates the shaft outer peripheral surface portion 1G. A plurality of examples) are formed in the circumferential direction. Further, a ridge 211 is provided around the cylindrical tip end portion 201S.
The shaft portion 202 is formed on the outer peripheral surface portion 210 of the vertical shaft portion that is connected to the cylindrical inner peripheral surface portion 204 of the cylindrical portion 201 following the base shaft portion 208 whose outer diameter is the same as the outer diameter of the lower tube body 20A2. A bolt is formed at the position facing the bolt insertion hole 240 formed in the tube portion 201 when the fit insertion portion 209 is fitted into the inner peripheral surface portion 204 of the tube portion. An insertion hole 241 (an example of the recess E) is formed. Further, the shaft tip 202S is provided with a protrusion 211 that fits in the circumferential groove 205 of the tube 201, and is formed on the tube tip 201S of the tube 201 at the upper part of the base shaft 208. A joint recess 213 that joins the ridge 211 is circumferentially contacted.
Then, when fitting the shaft portion 202 to the tube portion 201, a fitting operation in which the bolt insertion hole 240 provided in the tube portion 201 is aligned with the bolt insertion axis of the bolt insertion hole 241 formed in the fitting insertion portion 209. When the bolt 242 (an example of the fitting key member H) is screwed and connected so as to straddle both the insertion holes 240 and 241, the protrusion 211 provided on the shaft tip 202 S is fitted into the circumferential groove 205. At the same time, the cylindrical portion 201 and the shaft portion 202 can be fitted and connected in a state in which the protrusion 211 formed on the cylindrical portion distal end portion 201S is fitted in the joint recess 213.
With the above configuration, the bolts 242 can be tightened to prevent relative rotation about the axis X between the upper tube body 20A1 and the lower tube body 20A2 (an example of the rotation prevention mechanism M), and adjacent tubes. The two can be connected to each other in a retaining state (an example of the retaining mechanism S).

Hereinafter, still another aspect of the third embodiment will be described.
<1> The tubular body retaining mechanism and the rotation preventing mechanism are not limited to those provided separately as in the above-described configuration. For example, after fitting the shaft portion to the cylindrical portion, a bolt or a pin or the like (One example in which the tubular body retaining mechanism and the rotation preventing mechanism are formed of the same member) may be configured to join the cylindrical portion and the shaft portion together. In this case, adjacent pipes are connected to each other in a retaining state with a simple configuration in which an insertion hole is formed and a bolt or a pin is inserted without providing a complicated mechanism in the cylindrical portion and the shaft portion. It is possible to prevent relative rotation between the tube bodies.
<2> The key member used in the tubular body retaining mechanism is not limited to the arc key described in the previous embodiment. For example, a C-shaped elastic ring key is accommodated in the inward groove portion or the outward groove portion. In addition, it may be configured to fit in a state straddling the inward groove portion and the outward groove portion in accordance with the fitting operation between the tube portion and the shaft portion.
In this case, it is possible to connect the adjacent tubular bodies to each other in a retaining state only by the fitting operation of the shaft portion with respect to the cylindrical portion.
<3> Although the upper tube body 20A1 and the lower tube body 20A2 have been described in the above embodiment, the application of the present invention is not limited to the upper tube body 20A1 and the lower tube body 20A2, and for example, a steel pipe such as a steel pipe sheet pile is used. As long as it is possible to provide a tube connection portion formed as in the present configuration even in a tube formed using other materials such as a concrete tube, a synthetic tube, etc. Applicable.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be changed and designed as appropriate within the range where the effects of the present invention are exhibited. is there.

DESCRIPTION OF SYMBOLS 1 Steel pipe pile 2 Tubing body 10 Inner joint 11 Base 12 Inner fitting part 13 Outward circumferential groove (engaged part)
14 engaging recess 15 notch 16 bolt hole 18 hole 19 pin 20 outer joint 21 unit member 21A standard unit member 21B closing unit member 22 opening 23 inward key part (engaging part)
24 engaging convex part 33 bolt 101 steel pipe pile 102 pipe body 110 inner joint 111 base 112 inner fitting part 113 outward circumferential groove 114 engaging concave part 120 outer joint 121 unit member 121A opening unit member 121B standard unit member 121C reference unit member 121D Extension unit member 122 Opening portion 123 Inward circumferential groove 124 Engaging convex portion 130 Key member 131 Split key member 132 Closing member 133 Bolt 201 Tube portion 202 Shaft portion 204 Tube portion inner circumferential surface portion 206 Inward groove portion 210 Shaft portion outer circumferential surface portion 212 Outside Orientation groove 20A1 Tubing body 20A2 Tubing body B Connection part X Shaft center S Retaining mechanism M Non-rotating mechanism E Recessed part H Fitting key member

Claims (16)

A steel pipe pile in which connection portions for connecting adjacent tube bodies are provided at both ends of the tube body, and the connection portions of the tube bodies adjacent in the axial direction of the tube body are configured to be connectable. ,
The connecting portion is formed from a straight seam steel pipe,
The connecting portion includes a retaining mechanism that can freely connect adjacent tubular bodies to each other in a retaining state, and a rotation preventing mechanism that prevents relative rotation around the axis of the connected tubular bodies,
The joint part of the straight seam steel pipe is disposed at a position which is not a low-rigidity part whose rigidity in the circumferential direction is lower than that of other parts, at least in the parts constituting the retaining mechanism or the detent mechanism. Steel pipe pile. The connection portion includes a first inner joint provided at one end of the pipe body, a second inner joint provided at the other end, and the first pipe provided in one of the adjacent pipe bodies. In a state in which the inner joint and the second inner joint provided on the other pipe body are adjacent to each other, the outer joint provided around the first inner joint and the second inner joint,
The outer joint includes a plurality of unit members arranged around the first inner joint and the second inner joint, and the unit member includes a standard unit member and a closing unit member.
The standard unit member includes an engagement convex portion at an end portion on the first inner joint side and an end portion on the second inner joint side,
The first inner joint and the second inner joint are provided with an engagement concave portion that engages with the engagement convex portion to prevent the standard unit member from falling off,
At least a part of the wall surface constituting the engagement recess is provided with a notch that allows the engagement protrusion of the standard unit member to be inserted to a position corresponding to the engagement recess.
The closing unit member is not provided with the engaging convex portion, and is configured in a shape that is flush with the outer peripheral surface around the notched portion when arranged in the notched portion,
At least the first inner joint or the second inner joint includes a fixing mechanism for fixing the closing unit member,
The retaining mechanism includes an engagement portion provided on one of the outer circumferences of the first inner joint and the second inner joint, and an inner circumference of the outer joint, and the engagement provided on the other. And an engaged portion with which the mating portion engages,
The detent mechanism is configured to include the closing unit member and the notch,
2. The steel pipe pile according to claim 1, wherein the joint portion is disposed at a position that does not overlap the notch portion of the first inner joint and the second inner joint. The connection portion includes a first inner joint provided at one end of the pipe body, a second inner joint provided at the other end, and the first pipe provided in one of the adjacent pipe bodies. In a state in which the inner joint and the second inner joint provided on the other pipe body are adjacent to each other, the outer joint provided around the first inner joint and the second inner joint,
The outer joint includes a plurality of unit members arranged around the first inner joint and the second inner joint, and the unit member includes a standard unit member and a closing unit member.
The standard unit member includes an engagement convex portion at an end portion on the first inner joint side and an end portion on the second inner joint side,
The first inner joint and the second inner joint are provided with an engagement concave portion that engages with the engagement convex portion to prevent the standard unit member from falling off,
At least a part of the wall surface constituting the engagement recess is provided with a notch that allows the engagement protrusion of the standard unit member to be inserted to a position corresponding to the engagement recess.
The closing unit member is not provided with the engaging convex portion, and is configured in a shape that is flush with the outer peripheral surface around the notched portion when arranged in the notched portion,
At least the first inner joint or the second inner joint includes a fixing mechanism for fixing the closing unit member,
The retaining mechanism includes an engagement portion provided on one of the outer circumferences of the first inner joint and the second inner joint, and an inner circumference of the outer joint, and the engagement provided on the other. And an engaged portion with which the mating portion engages,
The detent mechanism is configured to include the closing unit member and the notch,
The steel pipe pile according to claim 1, wherein the joint portion is disposed on the standard unit member of the outer joint. The notch is composed of a first notch provided in the first inner joint and a second notch provided in the second inner joint,
The first inner joint and the second inner joint are fitted to each other when the first inner joint provided on one pipe and the second inner joint provided on the other pipe are adjacent to each other. The steel pipe pile according to claim 2 or 3, further comprising a positioning mechanism for positioning the first notch and the second notch at positions facing each other along a longitudinal direction of the steel pipe.   5. The steel pipe according to claim 4, wherein the positioning mechanism includes a hole provided on each of the opposing surfaces of the first inner joint and the second inner joint, and a positioning pin inserted through the hole. Pile. The engaged portion is an outward circumferential groove provided on the outer periphery of each of the first inner joint and the second inner joint;
The steel pipe pile according to any one of claims 2 to 5, wherein the engagement portion is an inward key portion that is provided on an inner periphery of the outer joint and engages with the outward circumferential groove. The engaging part is an outward key part provided on the outer periphery of each of the first inner joint and the second inner joint,
The steel pipe pile according to any one of claims 2 to 5, wherein the engaged portion is an inward circumferential groove provided on an inner periphery of the outer joint and engaged with the outward key portion. The connection portion includes a first inner joint provided at one end of the pipe body, a second inner joint provided at the other end, and the first pipe provided in one of the adjacent pipe bodies. In a state in which the inner joint and the second inner joint provided on the other pipe body are adjacent to each other, the outer joint provided around the first inner joint and the second inner joint,
Outer circumferential grooves are provided on the outer circumferences of the first inner joint and the second inner joint,
The inner circumference of the outer joint is provided with an inward circumferential groove facing the outward circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint,
A key member that engages with a key groove formed by the outward circumferential groove and the inward circumferential groove is provided,
The outer joint is provided with an opening through which the key member can be inserted into the key groove. The key member has a plurality of split key members constituting a part of a ring and the function of the split key member. And a closing member having a function of closing the opening,
A fixing mechanism for fixing the closing member to the first inner joint or the second inner joint after the insertion through the opening;
The retaining mechanism includes the outward circumferential groove, the inward circumferential groove, and the key member.
The anti-rotation mechanism includes the closing member, the opening, and the fixing mechanism.
The steel pipe pile according to claim 1, wherein the joint portion is disposed at a position in the outer joint that does not overlap the opening. The connection portion includes a first inner joint provided at one end of the pipe body, a second inner joint provided at the other end, and the first pipe provided in one of the adjacent pipe bodies. In a state in which the inner joint and the second inner joint provided on the other pipe body are adjacent to each other, the outer joint provided around the first inner joint and the second inner joint,
Outer circumferential grooves are provided on the outer circumferences of the first inner joint and the second inner joint,
The inner circumference of the outer joint is provided with an inward circumferential groove facing the outward circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint,
A key member that engages with a key groove formed by the outward circumferential groove and the inward circumferential groove is provided,
The outer joint is provided with an opening through which the key member can be inserted into the key groove,
The key member includes a plurality of split key members constituting a part of an annular ring, and a closing member having a function of the split key member and a function of closing the opening,
A fixing mechanism for fixing the closing member to the first inner joint or the second inner joint after the insertion through the opening;
The retaining mechanism includes the outward circumferential groove, the inward circumferential groove, and the key member.
The anti-rotation mechanism includes the closing member, the opening, and the fixing mechanism.
The steel pipe pile according to claim 1, wherein the joint portion is disposed at a position that does not overlap with a position at which the closing member is fixed in the inner joint. The connection portion includes a first inner joint provided at one end of the pipe body, a second inner joint provided at the other end, and the first pipe provided in one of the adjacent pipe bodies. In a state in which the inner joint and the second inner joint provided on the other pipe body are adjacent to each other, the outer joint provided around the first inner joint and the second inner joint,
Outer circumferential grooves are provided on the outer circumferences of the first inner joint and the second inner joint,
The inner circumference of the outer joint is provided with an inward circumferential groove facing the outward circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint,
A key member that engages with a key groove formed by the outward circumferential groove and the inward circumferential groove is provided,
The outer joint is provided with an opening through which the key member can be inserted into the key groove,
The key member includes a plurality of split key members constituting a part of an annular ring, and a closing member having a function of the split key member and a function of closing the opening,
A fixing mechanism for fixing the closing member to the first inner joint or the second inner joint after the insertion through the opening;
The retaining mechanism includes the outward circumferential groove, the inward circumferential groove, and the key member.
The anti-rotation mechanism includes the closing member, the opening, and the fixing mechanism.
The said joint part is arrange | positioned in the position which does not overlap the counterbore part formed in the said inner joint and the counterbore part formed in the said outer joint which comprise a rotation suppression keyway. Steel pipe pile.   The steel pipe pile according to any one of claims 8 to 10, wherein the outer joint is composed of a plurality of unit members arranged in parallel around the first inner joint and the second inner joint.   The steel pipe pile according to claim 11, wherein the plurality of unit members include an opening unit member provided with the opening and a standard unit member not provided with the opening. The plurality of unit members are
In a state where the first inner joint and the second inner joint are brought into contact with each other, a reference unit member provided around the first inner joint and the second inner joint;
The extension unit member which is provided in a state where the first inner joint and the second inner joint are separated from each other, and extends around the first inner joint and the second inner joint. The steel pipe pile according to 12. Each of the first inner joint and the second inner joint includes a base portion and an inner fitting portion extending to the base portion,
An engagement concave portion is provided in an annular shape on an end surface of the base portion facing the inner fitting portion,
The outward circumferential groove is provided in an annular shape on the outer periphery of the inner fitting portion,
The upper and lower end portions of the reference unit member and the extension unit member are provided with the engagement recess when the reference unit member and the extension unit member are provided so as to straddle the first inner joint and the second inner joint. A pair of engaging projections engageable with,
A pair of inward circumferential grooves facing the pair of outward circumferential grooves on the inner circumference of the reference unit member and the extension unit member;
The distance between the pair of inward circumferential grooves of the reference unit member is the same as the distance between the pair of outward circumferential grooves when the first inner joint and the second inner joint are in contact with each other. Set,
The distance between the pair of inward circumferential grooves of the extension unit member is set to the same distance as between the pair of outward circumferential grooves when the first inner joint and the second inner joint are separated from each other. The steel pipe pile according to claim 13. The connecting portion is formed by forming one of the connecting portions provided at both ends of the tubular body in a cylindrical portion and the other in a shaft portion that can be fitted into the tubular portion, so that adjacent tubular bodies are connected to each other. Is formed to be matable,
An inward groove portion is formed in the cylindrical inner peripheral surface portion of the cylindrical portion, and an outward groove portion is formed in the outer peripheral surface portion of the shaft portion of the shaft portion. Formed to face the groove,
The retaining mechanism is fitted in a state straddling the inward groove portion and the outward groove portion facing each other, and connects the cylindrical portion and the shaft portion of adjacent tubular bodies fitted to each other in a retaining state. Provided with a key member
The anti-rotation mechanism forms a recess in one or both of the tube portion and the shaft portion, and in a state where the tube portion and the shaft portion of adjacent tubular bodies are fitted and connected to each other, A fitting key member that fits into the recess and prevents relative rotation around the axis of the connected pipes is provided.
2. The steel pipe pile according to claim 1, wherein the joint portion is disposed at a position that does not overlap the concave portion of the cylindrical portion and the shaft portion.   16. A retaining mechanism capable of freely connecting adjacent tubular bodies to each other in a retaining state and a detent mechanism for preventing relative rotation around the axis of the connected tubular bodies are formed of the same member. Steel pipe pile as described.

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