JP2016153579A - Steel pipe joint mechanism and connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a connecting structure of a pair of steel pipes and reduce cost.SOLUTION: A joint mechanism of a pair of steel pipe piles 1A, 1B comprises: an inner joint 10A, which is disposed on the steel pipe pile 1A; an inner joint 10B; an exterior joint 20, which is installed around the inner joint 10A of the steel pipe pile 1A and an inner joint 10B of the steel pipe pile 1B; and a key member 30, which prevents the pair of steel pipe piles 1A, 1B from moving relative to each other in longer direction of the steel pipe pile 1. On the exterior joint 20, openings 22 (22A, 22B) are formed in order to insert split key members 31 composing a key member 30 into key grooves. The key groove comprises: outward peripheral grooves 13 (13A, 13B), which are formed on circumferences of the inner joint 10A and the inner joint 10B, respectively, from the outer peripheral surface of the exterior joint; and inward peripheral grooves 23 (23A, 23B), which are disposed on inner periphery of the exterior joint 20 so as to face the outward peripheral grooves 13 (13A, 13B).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel pipe joint mechanism and a connection method.

  Steel pipe piles are used as an example of steel pipes for constructing foundation piles for structure installation, retaining sheet piles, landslide deterrent piles, pier columns, and the like. A steel pipe pile with a length that reaches the support layer, which is the hard ground under the soft ground, is required, but for the convenience of production and transportation, the steel pipe pile of several meters to several tens of meters manufactured at the factory Is formed on the site, and a plurality of steel pipe piles are connected to each other at the site to form a predetermined length.

  As a mechanism for connecting steel pipe piles as described above, Patent Document 1 proposes a mechanical joint mechanism.

  In this joint mechanism, the inner circumferential groove of the outer fitting member and the outer circumferential groove of the inner fitting member are formed with the same groove width, and the inner fitting member and the inner fitting member are fitted to each other. The facing circumferential groove and the outward circumferential groove are opposed to each other, and the key member built in the inward circumferential groove is extruded to the outward circumferential groove side, and is fitted over the inward circumferential groove and the outward circumferential groove. By doing, it becomes the structure which couple | bonds a pair of steel pipe piles impossible to move relatively in the longitudinal direction of this steel pipe pile.

Japanese Patent No. 3158081

  However, the structure in which the key member is built in the inward circumferential groove in advance and pushed toward the outer circumferential groove at the time of connection tends to be complicated in structure, and the entire key member can be built in the inward circumferential groove. Since a width is required, there is a problem that the thickness of the outer fitting member is increased accordingly.

  This invention is made | formed in view of the said situation, Comprising: It aims at simplification of the structure which connects a pair of steel pipe, and aiming at reduction of cost.

  The first characteristic configuration of the joint mechanism according to the present invention is a steel pipe joint mechanism, a first inner joint provided at one end of the steel pipe, a second inner joint provided at the other end, and a pair of the above In order to connect the steel pipes, the first inner joint of one of the steel pipes and the second inner joint of the other steel pipe are adjacent to each other, straddling the first inner joint and the second inner joint. The outer joint, the first inner joint and the outer joint, and the second inner joint and the outer joint, and the pair of steel pipes move relative to each other in the longitudinal direction of the steel pipe. A key member for preventing this, an outer circumferential groove is provided on the outer periphery of each of the first inner joint and the second inner joint, and on the inner periphery of the outer joint, the first inner joint and The outward circumferential groove provided on the outer periphery of each of the second inner joints; An inwardly facing circumferential groove is provided, and the outer joint is inserted into the outer groove of the outer joint from the outer circumferential surface of the outer joint to the key groove constituted by the outwardly circumferential groove and the inwardly circumferential groove. Is provided with an opening.

  A first inner joint provided at one end of one steel pipe and a second inner joint provided at the other end of the other steel pipe are adjacent to each other, and the outer side straddles the first inner joint and the second inner joint. After the joint is provided around, the key member is changed from the outer peripheral surface of the outer joint to the key groove formed by the outward circumferential groove and the inward circumferential groove through the opening formed in the outer joint. Can be arranged. Therefore, unlike the conventional joint mechanism, the thickness of the outer joint can be reduced because the key member does not need to be built in the inward circumferential groove in advance, and the material cost can be reduced. 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.

  In the second characteristic configuration, 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. There is in point.

  Similar to the split key member, the opening portion is provided with a closing member having a function of preventing the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe. It is possible to prevent the member from falling out of the opening.

  The third characteristic configuration is that the outer joint is composed of a plurality of unit members arranged in parallel around the first inner joint and the second inner joint.

  By configuring the outer joint with a plurality of unit members that are large enough to be lifted by a worker, for example, lifting work by a machine such as a crane becomes unnecessary, so the workability of connecting steel pipes is improved. To do.

  The fourth characteristic configuration is 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.

  An opening unit member having an opening through which the key member can be inserted can be arranged at an arbitrary position. That is, workability is good in that the opening for inserting the key member into the key groove can be arbitrarily set in accordance with the circumstances of the work space at the site.

  In the fifth characteristic configuration, the plurality of unit members are arranged so as to straddle 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 provided, and an extension 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 in that it contains.

  A part of the outer joint provided around the first inner joint and the second inner joint is constituted by a reference unit member, and the other part is constituted by an extended unit member, thereby the one steel pipe. And the axis of the other steel pipe can be tilted.

  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, The pair of steel pipes can be connected while correcting the posture of the subsequent steel pipe connected to the steel pipe so as to be a predetermined posture, for example, a posture close to a vertical posture.

  In the sixth feature configuration, 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 the end surface of the base portion facing the inner fitting portion is associated with the base portion. A mating recess 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 member are provided at upper and lower end portions thereof, When the extension unit member is provided so as to straddle the first inner joint and the second inner joint, a pair of engagement convex portions that can be engaged with the engagement concave portion are provided, and the reference unit member and the extension A pair of inward circumferential grooves facing the pair of outward circumferential grooves is provided on an inner circumference of the unit member, and a distance between the pair of inward circumferential grooves of the reference unit member is the same as that of the first inner joint. The same distance as the distance between the pair of outward circumferential grooves when the second inner joint abuts And 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 in the set point.

  When the reference unit member or the extension unit member is provided so as to straddle the first inner joint and the second inner joint, the engagement convex portion and the engagement concave portion engage with each other so that the reference unit member is engaged. And the extension unit member is prevented from falling outward. 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.

  1st characteristic structure of the connection method which concerns on this invention is a connection method which connects a pair of steel pipes using the joint mechanism provided with any one 1st-6th characteristic structure mentioned above, Comprising: One steel pipe A first inner joint provided at one end of the outer joint and a first inner joint provided adjacent to the second inner joint provided at the other end of the other steel pipe, Inserting the second inner joint into an inner surface, straddling the outer joint between the first inner joint and the second inner joint, and through the opening provided in the outer joint, the first A key member that engages with the inner joint and the outer joint, and the second inner joint and the outer joint to prevent the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe, From the outer peripheral surface, the first inner joint and the second inner joint A key groove formed by an outward circumferential groove provided on each outer periphery and an inward circumferential groove provided on the inner circumference of the outer joint so as to face the outward circumferential groove; The key member inserted into the groove is slid in the circumferential direction in the key groove, and the key member is disposed at a predetermined position in the key groove except for a portion corresponding to the opening in the key groove. And a step of closing the opening by a closing member having a function of the key member and a function of closing the opening.

  The second characteristic configuration is a connection method for connecting a pair of steel pipes using the joint mechanism having any one of the fifth or sixth characteristic configuration described above, and is provided at one end of one steel pipe. A step of arranging an outer joint around the first inner joint, and a second inner joint provided at the other end of the first inner joint and the other steel pipe are adjacent to each other, and an inner surface of the outer joint is connected to the second inner joint. Inserting a joint and straddling the outer joint between the first inner joint and the second inner joint; and through the opening provided in the outer joint, the first inner joint and the outer joint. And a key member that engages with the second inner joint and the outer joint to prevent the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe from the outer peripheral surface of the outer joint. On the outer peripheries of one inner joint and the second inner joint Inserted into the key groove composed of the obtained outward circumferential groove and the inward circumferential groove provided on the inner periphery of the outer joint so as to face the outward circumferential groove, and inserted into the key groove The key member is slid in the circumferential direction in the key groove, and the key member is disposed at a predetermined position in the key groove excluding a portion corresponding to the opening in the key groove; A step of closing the opening by a closing member having a function of a key member and closing the opening, and in the step of surrounding the outer joint, the first inner joint and the second Among the plurality of unit members constituting the outer joint, a part of the unit members are configured by the reference unit member, and the other unit members are extended. Consists of unit members In, in that it includes the step of tilting the axis of the one of the steel pipe, and the axis of the other steel pipe.

Illustration of steel pipe and joint mechanism 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 Perspective view of outer joint according to another embodiment Perspective view of outer joint according to another embodiment Plan sectional drawing of the principal part of the outer joint by another embodiment Plan sectional drawing of the principal part of the outer joint by another embodiment Perspective view of outer joint according to another embodiment Side sectional view of an essential part of an outer joint according to another embodiment Side sectional view of an essential part of an outer joint according to another embodiment Side sectional view of an essential part of an outer joint according to another embodiment

A steel pipe joint mechanism and connection method according to the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a steel pipe pile 1 (1A, 1B) having a cylindrical outer peripheral surface driven into the ground by a hydraulic hammer, a press-fitting machine, a rotary press-fitting machine, etc., and a pair of steel pipe piles 1A, 1B. 2 shows a joint mechanism for connecting the steel pipe piles 1 to each other in the longitudinal direction. 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 a pair of steel pipe piles 1, one steel pipe pile The subscript A is attached to the code on the 1 side, and the subscript B is attached to the code on the other steel pipe pile 1 side.

  The steel pipe pile 1 (1A, 1B) is made of cast steel and has a substantially cylindrical inner joint 10 welded concentrically to both ends of the pipe body 2 (2A, 2B).

In the inner joint 10, an inner fitting portion 12 having an outer diameter smaller than that of the base portion 11 is extended from 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 annular key member 30 described later is formed in an annular shape. An engagement recess 14 for engaging an engagement projection 24 provided at an end of the outer joint 20 described later is formed in an annular shape on the end surface of the base 11 facing the inner fitting portion 12.

  In addition, although the inner joint 10 welded to both ends of the pipe body 2 has the same configuration, when the steel pipe pile 1 is driven into the ground, a subscript A is attached to the inner joint 10 side positioned on the lower side, A subscript B is attached to 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, it is possible to reduce the manufacturing cost as compared with a case of using a different configuration.

  As shown in FIGS. 1 and 2, the outer joint 20 is a cylindrical body made of cast steel having an outer diameter slightly larger than the outer diameter of the tube body 2 and an inner diameter that allows the inner joint 10 to be inserted. It is constituted by eight unit members 21 formed by dividing into eight equal parts in the circumferential direction. 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.

  The eight equal parts are only 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 raised by the operator by hand. It is preferable that the size is such that it can be obtained. Further, the unit members 21 can be manufactured one by one, for example, by bending an iron plate. However, as described above, the unit members 21 are manufactured one by one by dividing the cylindrical body. The manufacturing cost can be reduced compared to the above.

  The inner circumference of the outer joint 20 constituted by the eight unit members 21 is parallel to the outer circumferential groove 13 (13A, 13B) provided in each of the inner joint 10A and the inner joint 10B at the same depth. In the state in which the two circular inward circumferential grooves 23 (23A, 23B) are provided around the inner fitting portions 12 (12A, 12B) of the inner joint 10 (10A, 10B), the outward circumferential grooves 13 ( 13A, 13B).

  In a state where the outer joint 20 is provided around the inner joint 10, an annular space formed by the outward circumferential groove 13 and the inward circumferential groove 23 becomes a key groove for fitting the key member 30.

  By engaging the key member 30 in this key groove, that is, across the outward circumferential groove 13 and the inward circumferential groove 23, the inner joint 10A and the outer joint 20, and the inner joint 10B and the outer joint 20 are mutually connected. The pair of steel pipe piles 1 </ b> A and 1 </ b> B are engaged and connected in the longitudinal direction of the steel pipe pile 1.

  Each unit member 21 is formed with engaging convex portions 24A and 24B at the upper and lower end portions in the drawing. When the unit member 21 is provided around the inner joint 10, the engagement protrusions 24 </ b> A and 24 </ b> B may engage with the engagement recesses 14 </ b> A and 14 </ b> B of the inner joint 10, causing the unit member 21 to drop outward. Is prevented.

  Of the eight unit members 21, the four unit members 21 have the key member 30 formed by the outward circumferential groove 13 and the inward circumferential groove 23 in a state where the outer joint 20 is provided around the inner joint 10. In order to arrange the key groove to be configured, a part of the outward circumferential groove 13 (13A, 13B) in the longitudinal direction is exposed outward over the entire width of the outward circumferential groove 13 (13A, 13B). Two openings 22 (22A, 22B) are provided. These unit members 21 are opening unit members 21A.

  The opening 22 (22A, 22B) is configured in a shape cut out over the entire width of the inward circumferential groove 23 (23A, 23B) along the location where each inward circumferential groove 23 (23A, 23B) is formed. Yes.

  Through the opening 22 (22A, 22B), the key member 30 is inserted from the outer peripheral surface of the outer joint 20 into a key groove formed by the outward circumferential groove 13 and the inward circumferential groove 23.

  The other four unit members 21 have the same configuration as the opening unit member 21A except that the opening unit 22 (22A, 22B) is not provided. These unit members 21 are standard unit members 21B.

  In the present embodiment, four opening unit members 21A and four standard unit members 21B are arranged alternately around the inner joint 10 to constitute a cylindrical outer joint 20. Since the opening unit member 21A is formed with the opening 22, the strength is weaker than that of the standard unit member 21B. Therefore, the strength of the outer joint 20 as a whole can be homogenized by alternately arranging the opening unit members 21A and the standard unit members 21B.

As shown in FIG. 1, the key member 30 is a member disposed in the key groove, and is composed of a plurality of arc-shaped members obtained by dividing an annular body into 16 equal parts in the circumferential direction. Has been.
However, of the 16 arc-shaped members, 12 are divided key members 31 that are arranged in the key groove and function as the key member 30, and the remaining four have a function as the key member 30 and have openings. 22 is a closing member 32 having a function of closing 22.
Twelve divided key members 31 and four closing members 32 are arranged per one key groove, and constitute an annular key member 30 as a whole.

  In the split key member 31, the dimension in the direction along the longitudinal direction of the steel pipe pile 1 is set to be slightly smaller than the dimension in the direction of the opening 22, and the dimension in the direction along the circumferential direction of the steel pipe pile 1 is The dimension in the direction along the radial direction of the steel pipe pile 1 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 13 and the inward circumferential groove 23 is set slightly smaller. Yes.

  The size of the closing member 32 in the direction along the longitudinal direction of the steel pipe pile 1 is set slightly smaller than the size in the direction of the opening 22, and the dimension in the direction along the circumferential direction of the steel pipe pile 1 is that of the opening 22. The dimension in the direction along the radial direction of the steel pipe pile 1 is set to be substantially the same as the dimension from the bottom surface of the outward circumferential groove 13 to the surface of the opening 22.

  Further, the closing member 32 is configured to be fixed to the inner joint 10 by a bolt 33 after being inserted into the opening 22. The closing member 32 may be configured to be fixed to the outer joint 20.

  Further, a rotation inhibiting key for inhibiting relative movement in the circumferential direction of the inner joint 10A and the inner joint 10B connected via the outer joint 20 is arranged at the boundary between the outer peripheral surfaces of the inner joint 10 and the outer joint 20. It is installed.

  Although not shown, the rotation suppression key includes a counterbore portion formed on the outer peripheral surface of the base portion 11 of the inner joint 10 and a counterbore portion formed on the outer peripheral surface of the outer joint 20 so as to face the counterbore portion. It is straddled across the configured rotation inhibition keyway. In addition, the dimension and number of the said rotation suppression key and the said counterbore part are suitably set according to the construction method of the steel pipe pile 1. FIG. The rotation suppression key may be formed integrally with one of the inner joint 10 or the outer joint 20, and in this case, a counterbore part is formed only on the other.

  The configuration for suppressing the relative movement of the inner joint 10A and the inner joint 10B 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 1 of the engagement convex portion 24 of at least one unit member of the eight unit members 21 and the engagement concave portion 14 with which the engagement convex portion 24 engages is set. Further, it may be configured to be different from the engaging convex portion 24 of the other unit member 21. In this case, the unit member 21 performs the same function as the rotation suppression key.

  Next, based on FIG. 3 to FIG. 12, in the method of driving into the ground with a hydraulic hammer or the like, the connecting method according to the present invention is an example in which the succeeding steel pipe pile 1B is connected to the steel pipe pile 1A previously driven. Will be explained.

The above-described joint mechanism is used as a connecting method for connecting the pair of steel pipe piles 1A and 1B.
First, as shown in FIG. 3, each engaging convex part 24A (24) is set in the engaging concave part 14A (14) of the inner joint 10A provided at the upper end of one steel pipe pile 1A driven in advance. While being engaged, the four opening unit members 21A and the four standard unit members 21B are alternately arranged side by side to form a cylindrical outer joint 20 around the inner joint 10A as shown in FIG.

  Next, as shown in FIGS. 5 and 6, the other steel pipe pile 1B is suspended from the steel pipe pile 1A, and the engaging convex portion 24B of the opening unit member 21A and the standard unit member 21B constituting the outer joint 20 By engaging (24) with the engaging recess 14B (14) of the inner joint 10B, the inner joints 10A, 10B of the pair of steel pipe piles 1A, 1B are arranged at predetermined positions inside the outer joint 20.

  Next, as shown in FIGS. 7 to 9, the split key member 31 is inserted into the opening 22 of the opening unit member 21A. The split key member 31 inserted into the opening 22 is slid along the longitudinal direction of the key groove. Then, the next split key member 31 is inserted into the opening 22.

  When the insertion of the predetermined number of split key members 31 is completed, as shown in FIGS. 10 to 12, the closing member 32 inserted into the opening 22 is fixed with a bolt 33 to close the opening 22.

  As described above, the pair of steel pipe piles 1 </ b> A and 1 </ b> B can be coupled so as not to move relatively in the longitudinal direction of the steel pipe pile 1.

  Finally, the rotation suppression key is composed of a counterbore portion formed on the outer peripheral surface of the base portion 11 of the inner joint 10 and a counterbore portion formed on the outer peripheral surface of the outer joint 20 so as to face the counterbore portion. By straddling the rotation-suppressing keyway, the pair of steel pipe piles 1 </ b> A and 1 </ b> B are connected so as not to move relatively in the circumferential direction of the steel pipe pile 1.

  By the way, by forming the outer joint 20 of the joint mechanism according to the present invention with the plurality of unit members 21, there are the following advantages in addition to reducing the manufacturing cost as described above.

The unit member 21 constituting the outer joint 20 is formed by dividing a cylindrical body made of cast steel into eight equal parts in the circumferential direction.
The unit member 21 has a height in a direction along the longitudinal direction of the steel pipe pile 1 and is provided so as to straddle the inner joint 10A and the inner joint 10B with the inner joint 10A and the inner joint 10B in contact with each other. It may be formed from a cylindrical body having a reference distance, a cylindrical body having a distance slightly longer than the reference distance by, for example, about 0.5 mm, or a cylindrical body having a distance longer by about 1.0 mm. The unit member 21 formed from a cylindrical body having the reference distance is a reference unit member 21C, and the unit member 21 formed from a cylindrical body having a distance longer than the reference distance is an extended unit member 21D. . The reference unit member 21C and the extension unit member 21D are also the opening unit member 21A if the opening 22 is provided, and are the standard unit member 21B if the opening 22 is not provided.

  At the upper and lower ends of the extension unit member 21D, as with the reference unit member 21C, when the unit member 21 is provided around the inner joint 10, it is engaged with the engagement recesses 14A and 14B of the inner joint 10. Joint convex parts 24A and 24B are formed. Similar to the reference unit member 21C, two annular inward circumferential grooves 23 (23A, 23B) are formed on the inner periphery of the extension unit member 21D.

The distance between the pair of inward circumferential grooves 23 (23A, 23B) of the reference unit member 21C is between the pair of outward circumferential grooves 13 (13A, 13B) when the inner joint 10A and the inner joint 10B are in contact with each other. Is set to the same distance as
The distance between the pair of inward circumferential grooves 23 (23A, 23B) of the extension unit member 21D is between the pair of outward circumferential grooves 13 (13A, 13B) when the inner joint 10A and the inner joint 10B are separated from each other. The same distance is set.
The distance between the inward circumferential grooves 23 (23A, 23B) of the extension unit member 21D is formed to be wider than the reference distance by 0.5 mm or 1.0 mm.
That is, the extension unit member 21D is configured such that the distance between the inward circumferential grooves 23 (23A, 23B) is longer than the distance between the inward circumferential grooves 23 (23A, 23B) of the reference unit member 21C. 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 1.

When the outer joint 20 is configured by the reference unit member 21C, the opposing surfaces of the inner joint 10A of the steel pipe pile 1A to be connected and the inner joint 10B of the steel pipe pile 1B are in contact with each other.
On the other hand, when the outer joint 20 is constituted by the extension unit member 21D having a distance 0.5 mm longer than the reference distance, the distance between the opposing surfaces of the inner joint 10A of the steel pipe pile 1A and the inner joint 10B of the steel pipe pile 1B is 0. When the outer joint 20 is formed by the extension unit member 21D having a distance of 1.0 mm longer than the reference distance with a gap of 5 mm, the opposing surface between the inner joint 10A of the steel pipe pile 1A and the inner joint 10B of the steel pipe pile 1B is formed. A gap of 1.0 mm is generated between them.

  When the outer joint 20 group having different lengths in the longitudinal direction of the steel pipe pile 1 is prepared, for example, as shown in FIG. 13, the posture of the steel pipe pile 1 </ b> A driven in advance is in the vertical direction. When the steel pipe pile 1B is connected to the steel pipe pile 1A, the reference unit member 21C and the extension unit member 21D are combined, for example, the reference unit member 21C is arranged on the left side in the figure. And by arrange | positioning extension unit member 21D on the right side in a figure, the attitude | position of the subsequent steel pipe pile 1B can be driven into the attitude | position along a perpendicular direction. The steel pipe piles 1A and 1B can be connected while being corrected so as to have a posture close to a vertical posture. Since the inward circumferential groove 23 (23A, 23B) is configured to have a width with a slight margin with respect to the split key member 31, the key of the split key member 31 can be used even when the steel pipe piles 1A, 1B are tilted. Slides along the length of the groove are not disturbed.

  In the above-described embodiment, the opening 22 of the outer joint 20 is provided in the center of the opening unit member 21A. However, the opening 22 straddles two adjacent unit members 21 as shown in FIG. May be formed. Moreover, as shown in FIG. 15, you may form so that an up-and-down position may differ in the opening unit member 21A. As shown in FIG. 15, by shifting the formation position of the opening 22 to the left and right, it is possible to suppress a decrease in strength of the opening unit member 21 </ b> A compared to the case where the opening 22 is formed vertically.

  In the above-described embodiment, the division surface of the unit member 21 constituting the outer joint 20 is configured as a plane. However, as shown in FIGS. 16 and 17, the engagement surfaces engage with each other on the opposing surfaces of the adjacent unit members 21. A joint may be provided. It is possible to prevent the unit member 21 from dropping outward by not only engaging the engagement convex part 24 with the engagement concave part 14 but also engaging the adjacent unit members 21 with each other.

  In the above-described embodiment, the outer joint 20 is configured by the unit member 21 divided into eight equal parts, but the outer joint 20 may be configured as a cast steel cylindrical body as shown in FIG. . In this case, as shown in FIG. 19, the inner joint 10 does not have to include the engagement recess 14. However, in the work of connecting the steel pipe pile 1A and the steel pipe pile 1B, a mechanism and work for holding the outer joint 20 around the inner joint 10 are required until the split key member 31 is inserted into the key groove. .

  In order to solve this point, as shown in FIG. 20, at least the inner joint 10 </ b> A of the steel pipe pile 1 </ b> A may be provided with an engagement step portion 15 for holding the outer joint 20 around the inner joint 10.

  Further, as shown in FIG. 21, the outer peripheral surface of the outer joint 20 may not be formed to be flush with the outer peripheral surface of the base 11 of the inner joint 10.

  The steel pipe joint mechanism according to the present invention may be used to connect steel pipes such as earth retaining steel pipe sheet piles, landslide deterrent piles, and pier columns in addition to foundation piles for structure installation.

  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 appropriately changed and designed within the range where the effects of the present invention are exhibited. is there.

1 Steel pipe pile (steel pipe)
2 Tube 10 Inner joint 11 Base 12 Inner fitting 13 Outward circumferential groove 14 Engaging recess 20 Outer joint 21 Unit member 21A Opening unit member 21B Standard unit member 21C Reference unit member 21D Extension unit member 22 Opening 23 Inward circumference Groove 24 Engaging convex portion 30 Key member 31 Split key member 32 Closing member 33 Bolt

Claims (8)

A steel pipe joint mechanism,
A first inner joint provided at one end of the steel pipe, a second inner joint provided at the other end,
In order to connect the pair of steel pipes, the first inner joint and the second inner joint in a state where the first inner joint of one of the steel pipes and the second inner joint of the other steel pipe are adjacent to each other. An outer joint that runs around
A key member that engages with the first inner joint and the outer joint, and the second inner joint and the outer joint to prevent the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe; ,
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,
The outer joint is provided with an opening for inserting the key member from an outer peripheral surface of the outer joint into a key groove constituted by the outward circumferential groove and the inward circumferential groove. Characteristic joint mechanism.   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. The joint mechanism according to claim 1.   The joint mechanism according to claim 2, 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.   4. The joint mechanism according to claim 3, 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 in contact with each other, a reference unit member provided around the first inner joint and the second inner joint,
An extension 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. The joint mechanism according to claim 3 or 4. 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 joint mechanism according to claim 5. A connection method for connecting a pair of steel pipes using the joint mechanism according to any one of claims 1 to 6,
A step of surrounding an outer joint to a first inner joint provided at one end of one steel pipe;
The first inner joint and the second inner joint provided at the other end of the other steel pipe are adjacent to each other, the second inner joint is inserted into the inner surface of the outer joint, and the outer joint is connected to the first inner joint. And straddling the second inner joint,
Through the opening provided in the outer joint, the first inner joint and the outer joint, and the second inner joint and the outer joint are engaged with each other so that the pair of steel pipes are in the longitudinal direction of the steel pipe. A key member for preventing relative movement from the outer peripheral surface of the outer joint to the outer circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint, and the outer circumferential groove. The key member inserted in the key groove is slid in the circumferential direction in the key groove. And placing the key member at a predetermined position in the key groove excluding a portion corresponding to the opening in the key groove;
And a step of closing the opening with a closing member having the function of the key member and the function of closing the opening. A connecting method for connecting a pair of steel pipes using the joint mechanism according to claim 5 or 6,
A step of surrounding an outer joint to a first inner joint provided at one end of one steel pipe;
The first inner joint and the second inner joint provided at the other end of the other steel pipe are adjacent to each other, the second inner joint is inserted into the inner surface of the outer joint, and the outer joint is connected to the first inner joint. And straddling the second inner joint,
Through the opening provided in the outer joint, the first inner joint and the outer joint, and the second inner joint and the outer joint are engaged with each other so that the pair of steel pipes are in the longitudinal direction of the steel pipe. A key member for preventing relative movement from the outer peripheral surface of the outer joint to the outer circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint, and the outer circumferential groove. The key member inserted in the key groove is slid in the circumferential direction in the key groove. And placing the key member at a predetermined position in the key groove excluding a portion corresponding to the opening in the key groove;
Closing the opening with a closing member having the function of the key member and having the function of closing the opening, and
In the step of surrounding the outer joint,
Among the plurality of unit members constituting the outer joint, the outer joint provided around the first inner joint and the second inner joint includes a part of the unit members as the reference unit member. A connecting method comprising the step of inclining the axis of the one steel pipe and the axis of the other steel pipe by configuring the other unit member as the extension unit member.

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