JP6778031B2 - Pile component joint method, pile construction method, press-fitting machine, and claw member - Google Patents

Description

The present invention relates to a method of joining pile constituent members, a method of constructing a pile body, a press-fitting machine, and a claw member.

Prefabricated piles may be used for foundation piles of building structures and sheet piles such as steel sheet piles and steel pipe sheet piles that form retaining walls by being installed continuously. Prefabricated piles are installed by driving into the ground, press-fitting, etc., or by building in holes drilled in the ground in advance. There are various types of ready-made piles, such as steel pipe piles, concrete piles, steel pipe sheet piles, and steel sheet piles, depending on the purpose. There is a limit to the length of the pile material that can be installed in one process due to the manufacturing conditions and transportation conditions of the pile material, the construction conditions at the construction site, and the like. Therefore, by preparing a plurality of pile materials and installing the pile materials while sequentially connecting them with joints, it is possible to install a pile body having a certain length.

A welded joint is known as a joint structure for connecting a plurality of pile materials as described above. However, in the case of a welded joint, it takes a long time to connect because it depends on the welding work, and a great deal of time and labor is required because the inspection of the welded portion also occurs. In addition, since welding work is required at the outdoor construction site where the pile body is installed, it is affected by the weather such as rain and wind, and is also affected by the quality of the skills of the workers who perform the welding work. become. Therefore, in recent years, a method of connecting steel pipes via a mechanical joint has been developed.

As such a mechanical joint, for example, a method of connecting by pressing and crimping a steel pipe using a dedicated joint and a jig as shown in Patent Document 1 is known.
In Patent Document 1, the outer cylinder and the inner side of the outer cylinder are provided with a partition wall provided in the middle of the outer cylinder at intervals at which the ends of the steel pipe piles to be connected from both ends of the outer cylinder can be inserted. Through holes for inserting a plurality of fixing pins provided at predetermined intervals in the circumferential direction in the tubular bodies of the connected inner cylinder and the outer cylinder on both sides of the partition wall, and the inner cylinder facing the through holes. A steel pipe pile joint having a recess provided on the outer peripheral surface of the above and a support portion provided across the inner cylinder and receiving the bottom wall of each recess from the inside is described, and further, this steel pipe is described. It describes a method in which a fixing pin is inserted into a through hole for inserting a fixing pin provided in a pile joint and a dedicated caulking jig for crimping a steel pipe pile is used.

Japanese Unexamined Patent Publication No. 2014-159727

However, in the technique described in Patent Document 1, it is necessary to provide a dedicated steel pipe joint in a complicated shape on the pile constituent member itself constituting the pile body to connect the ends of the steel pipe piles. Moreover, when crimping the steel pipe pile by pressing the fixing pin provided on the dedicated steel pipe pile joint, a crimping jig that is separate from the steel pipe pile joint and is dedicated is used. Therefore, there is a problem that the cost of the steel pipe pile joint itself and the caulking jig having a complicated shape and the processing cost of the steel pipe pile joint are high.
Further, in Patent Document 1 described above, since the steel pipe of the steel pipe pile is pressed and crimped, an extremely large pressing force is required for the caulking jig, the caulking jig becomes large and the cost increases, and the construction is performed. There was a problem that it took a lot of time and effort to complete the construction.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and it is possible to easily connect the pile constituent members without performing complicated processing, and it is possible to reduce the construction cost and the construction period. It provides a method of joining pile constituent members, a method of constructing a pile body, a press-fitting machine, and a claw member that can be planned.

In order to achieve the above object, the method of joining the pile constituent members according to the present invention is a method of joining the pile constituent members that connect the pile constituent members constituting the pile body in an overlapping manner with each other, and one of the pile configurations. The pile constituent member arranging step of arranging the first connecting portion provided on the member and the second connecting portion provided on the other pile constituent member in an overlapping manner, and pressing against the peripheral surface of the pile body is possible. By pressing at least one of the first connecting portion and the second connecting portion arranged so as to be overlapped in the pile constituent member arranging step by the pressing portion provided on the pile component, the pile constituent members are plastically deformed. It is characterized by having a joint process for connecting the piles.

In the present invention, the first connecting portion provided on one pile constituent member and the second connecting portion provided on the other pile constituent member are arranged so as to overlap each other. Next, at least one of the first connecting portion and the second connecting portion is pressed by the pressing portion provided so as to be able to press against the peripheral surface of the pile body to plastically deform the first connecting portion and the second connecting portion. The connecting portion is integrally connected, and the pile constituent members can be connected to each other. Since the pile constituent members can be easily and efficiently connected to each other by a simple joint method of simply pressing with the pressing portion in this way, it is possible to reduce the construction cost and the construction period.
Here, the first connecting portion and the second connecting portion of the pile constituent member do not need to have a complicated shape. Further, the pressing portion may have a structure in which at least one of the first connecting portion and the second connecting portion is pressed to have a pressing force that can be plastically deformed, and it is not necessary to use a complicated connecting device. The cost can be reduced.

Further, in the method of joining a pile constituent member according to the present invention, a through hole or a recess is provided in the first connecting portion, and after the pile constituent member arranging step, a chuck portion that grips the peripheral surface of the pile body is provided. It has a pressing portion positioning step in which the pile constituent members are gripped by the chuck portion of the gripping device, and the pressing portion is arranged so as to face a position overlapping the through hole or the recess in the second connecting portion. In the joint step, the second connecting portion is plastically deformed toward the first connecting portion by the pressing portion, so that the plastic deformed portion of the second connecting portion is inserted into the through hole or the recess. It is preferable that the pile constituent members are connected to each other.

In this case, one pile constituent member having a first connecting portion formed with a through hole or a recess and the other pile constituent member provided with a second connecting portion are arranged so as to overlap each other. Next, the pile constituent members are gripped by the chuck portion of the gripping device having the chuck portion that grips the peripheral surface of the pile body, and the pressing portion is arranged so as to face the position overlapping the through hole or the recess in the second connecting portion. .. After that, the second connecting portion is plastically deformed toward the first connecting portion by the pressing portion, so that the plastic deformed portion of the second connecting portion is inserted into the through hole or the recess and engaged. As a result, the first connecting portion and the second connecting portion are integrally connected, and the pile constituent members can be connected to each other.
Here, the through hole or recess formed in the first connection portion of one of the pile constituent members need only be formed at a position where it can be overlapped with the second connection portion, and does not need to have a complicated shape.

Further, in the method of joining the pile constituent members according to the present invention, a pile deformation prevention device having a reaction force wall in contact with the peripheral surface of the pile body is provided on the opposite side of the pressing portion sandwiching the pile constituent member. In the joint step, when the pressing portion presses at least one of the first connecting portion and the second connecting portion, it is preferable that the reaction force wall is brought into contact with the peripheral surface of the pile body.

By adopting such a joint method, when at least one of the first connection portion and the second connection portion is pressed by the pressing portion to be plastically deformed, the circumference of the pile component member on the side opposite to the pressing side by the pressing portion. Since the reaction force wall of the pile deformation prevention device is arranged in contact with the surface, it is possible to suppress the deformation of the peripheral portion of the pile constituent member excluding the plastic deformation portion.
Further, since the deformation of the pile constituent member at the time of pressing by the pressing portion is suppressed, the plastic deformed portion can be reliably formed with a desired size and shape.

Further, the method for constructing the pile body according to the present invention uses the above-mentioned joint method for the pile constituent members, and the pile body is press-fitted into the ground by a press-fitting machine having a chuck portion for gripping the peripheral surface of the pile body. In the method of constructing a pile body, one of the pile constituent members constituting the pile body is gripped by the chuck portion and press-fitted into the ground, and one pile constituent member press-fitted in the press-fitting step is performed. The arrangement step of arranging the second connection portion provided on the other pile constituent member on the first connection portion provided and the pressing portion provided on the press-fitting machine overlap the second connection portion in the arrangement step. It is characterized by having a joint step of connecting the pile constituent members to each other by pressing at least one of the first connecting portion and the second connecting portion to plastically deform the pile constituent members.

According to the present invention, one of the pile constituent members constituting the pile body is gripped by the chuck portion of the press-fitting machine and press-fitted into the ground, and the other pile constituent member is overlapped with the press-fitted one pile constituent member. Deploy. Next, one of the pile constituent members is plastically deformed toward the other by the pressing portion provided in the press-fitting machine, so that one pile constituent member can be engaged with and connected to the other pile constituent member. Since the pile body can be constructed by easily and efficiently connecting the pile constituent members by a simple construction method of simply pressing with the pressing portion in this way, it is possible to reduce the construction cost and the construction period. it can.

Further, the press-fitting machine according to the present invention is a press-fitting machine that grips the pile body and press-fits it into the ground, and presses the chuck portion capable of gripping the peripheral surface of the pile body and the peripheral surface of the pile body. It is characterized by including a pressing portion capable of plastically deforming the pile body.

In this case, since the press-fitting machine is provided with a pressing portion, the gripping force used for the chuck portion of the press-fitting machine can be used as the pressing force required for the pressing portion. Therefore, a device provided with a dedicated pressing portion separately. It is not necessary to provide the above, and the construction period and cost can be reduced.

Further, in the press-fitting machine according to the present invention, the chuck portion has a chuck claw that abuts on the peripheral surface of the pile body, and the pressing portion abuts on the peripheral surface of the pile body of the chuck claw. It is preferable that it is provided so as to be able to appear and disappear from the contact surface.

According to this configuration, after the pressing portion housed in the chuck claw is arranged at a position of the peripheral surface of the pile body facing the connecting portion between the pile constituent members, the pressing portion is placed on the contact surface of the chuck claw. The pile body including the connecting portion is gripped by the chuck portion. As a result, the peripheral surface of the pile body is pressed by the pressing portion protruding from the contact surface to plastically deform the pile body, so that the pile constituent members are integrally connected to each other.
In this case, since the pressing portion is housed inside the chuck claw so as to be able to appear and disappear, the gripping force used for the chuck portion of the press-fitting machine can be used as the pressing force required for the pressing portion. It is not necessary to provide a device equipped with a part, and the construction period and cost can be reduced.

Further, it is preferable that the press-fitting machine according to the present invention is provided with a positioning means for positioning the pressing portion at a predetermined position on the peripheral surface of the pile body.

According to this configuration, for example, the second connecting portion of the other pile constituent member is superposed on the outer peripheral side of the first connecting portion of one pile constituent member in which the through hole is formed, and the second connecting portion thereof is arranged. Is plastically deformed by the pressing portion and inserted into the through hole to engage with the pressing portion, the pressing portion can be positioned so as to face the position overlapping the through hole in the second connecting portion by the positioning means. That is, since the pressing portion is positioned by the positioning means, the pile body can be plastically deformed at an appropriate pressing position.

Further, the claw member according to the present invention is provided on a chuck portion capable of gripping the peripheral surface of the pile body in a press-fitting machine that grips and press-fits the pile body, and the claw abuts on the peripheral surface of the pile body. It is a member and has a contact surface that comes into contact with the peripheral surface of the pile body, is provided so as to be able to appear and disappear from the contact surface, and presses the peripheral surface of the pile body to plastically deform the pile body. It is characterized by being provided with a pressing portion capable of capable.

According to this configuration, after the pressing portion housed in the chuck claw is arranged at a position of the peripheral surface of the pile body facing the connecting portion between the pile constituent members, the pressing portion is placed on the contact surface of the chuck claw. The pile body including the connecting portion is gripped by the chuck portion. As a result, the peripheral surface of the pile body is pressed by the pressing portion protruding from the contact surface to plastically deform the pile body, so that the pile constituent members are integrally connected to each other.
In this case, since the pressing portion is housed inside the chuck claw so as to be able to appear and disappear, the gripping force used for the chuck portion of the press-fitting machine can be used as the pressing force required for the pressing portion. It is not necessary to provide a device equipped with a part, and the construction period and cost can be reduced.

Further, in the claw member according to the present invention, the chuck portion is provided with a chuck frame that can move in the axial direction and the circumferential direction of the pile body, and is provided detachably from the chuck frame. preferable.

In this case, since the claw member provided with the pressing portion can be attached to and detached from the chuck frame of the chuck portion, only the claw member of a generally used press-fitting machine can be easily attached to the claw member having the pressing portion. It is possible to replace it with. Therefore, by using a press-fitting machine that has been used conventionally, the connecting portion of the pile body can be plastically deformed by pressing by the pressing portion as described above, and the pile constituent members can be easily connected to each other. There is no need to provide.
Further, the present invention has an advantage that a claw member having a shape suitable for the pile body conditions such as pile diameter and pile thickness and having a pressing portion may be selected and mounted on the chuck frame.

According to the method of joining the pile constituent members, the method of constructing the pile body, the press-fitting machine, and the claw member of the present invention, the pile constituent members can be easily connected without complicated processing, and can be used for construction. It is possible to reduce such cost and construction period.

It is a schematic diagram which shows the pile body by embodiment of this invention. It is a side view which shows the joint structure by embodiment of this invention. It is a side view which showed the state which separated the steel pipe at the connection part in the joint structure shown in FIG. It is explanatory drawing which shows the press-fitting process in the joint method by this embodiment. FIG. 4 is a cross-sectional view taken along the line II shown in FIG. 4, showing a method of joining a steel pipe in a press-fitting step in the joining method. FIG. 5 is a cross-sectional view taken along the line II-II shown in FIG. 5, showing a method of joining a steel pipe in a press-fitting step in the joining method. It is an enlarged view of the main part of the pressing part in the chuck claw shown in FIG. It is a front view which saw the chuck claw from the contact surface side. FIG. 8 is a view taken along the line III-III shown in FIG. 8 and is a side view of the chuck claw. FIG. 8 is a view taken along the line IV-IV shown in FIG. 8 and is a view of the chuck claw viewed from above. FIG. 8 is a view taken along the line VV shown in FIG. 8 and is a view of the chuck claw viewed from below. It is a rear view which looked at the chuck claw from the reaction force support part side. FIG. 8 is a sectional view taken along line VI-VI shown in FIG. 8 and is a vertical sectional view of a chuck claw. FIG. 8 is a sectional view taken along line VII-VII shown in FIG. 8, which is a horizontal sectional view of a chuck claw. FIG. 8 is a sectional view taken along line VIII-VIII shown in FIG. 8, which is a horizontal sectional view of a chuck claw. It is a horizontal sectional view for demonstrating the joint method in the state which the 1st pile deformation prevention device is arranged in the steel pipe at the time of pressing. It is explanatory drawing which shows the piping process in the joint method by this Embodiment, and is the figure which follows the press-fitting process of FIG. It is explanatory drawing which shows the piping process in the joint method by this Embodiment, and is the figure which follows the piping process of FIG. It is explanatory drawing which shows the joint process in the joint method by this Embodiment, and is the figure which follows the piping process of FIG. FIG. 19 is a horizontal cross-sectional view showing a state in which the pressing portion is projected from the contact surface of the claw body in the joint process shown in FIG. 19, and is a view corresponding to FIG. FIG. 20 is a cross-sectional view taken along the line IX-IX shown in FIG. 20 and is a vertical cross-sectional view showing a state in which the pressing portion is projected from the contact surface of the nail body. It is an enlarged view of the main part of the pressing part in the chuck claw shown in FIG. FIG. 9 is a horizontal cross-sectional view showing a state in which the pressing portion is advanced and the lower end joint portion is pressed in the joint process shown in FIG. 19, and is a view corresponding to FIG. 20. It is a cross-sectional view taken along line XX shown in FIG. 23, and is a vertical cross-sectional view showing a state in which the pressing portion is advanced and the lower end joint portion is pressed. It is an enlarged view of the main part of the pressing part in the chuck claw shown in FIG. It is a figure which shows the joint method of the steel pipe in the press-fitting process in the joint method. It is a side view which showed the state which the steel pipe was separated at the connection part in the joint structure by 1st modification, and is the figure which corresponds to FIG. It is a figure which shows the joint structure by the 2nd modification, and is the figure corresponding to FIG. 27. It is a horizontal sectional view for demonstrating the joint method in the state which arranged the 2nd pile deformation prevention device by the 3rd deformation example, and is the figure corresponding to FIG. It is a side view for demonstrating the joint method by another embodiment. FIG. 30 is a view taken along the line XI-XI shown in FIG. 30 for explaining a joint method.

Hereinafter, a method of joining pile constituent members, a method of constructing a pile body, a press-fitting machine, and a claw member according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a pile body 100 constructed by a press-fitting machine used in a method of joining pile constituent members and a method of constructing a pile body according to the present embodiment. As shown in FIG. 1, the pile body 100 is a steel pipe pile in the present embodiment, and a plurality of piles are arranged in the ground A at a predetermined pitch so that the upper end portion 100a protrudes to the above-ground portion. .. Each pile body 100 is configured by connecting a plurality of steel pipes 101, which are pile constituent members, in an axial direction P which is a direction along the axis L100 of the pile body 100. The steel pipe 101 has a tubular main body 102 and an upper end joint 103 formed in a tubular shape having an outer diameter substantially equal to the inner diameter of the main body 102, which is connected to one end of the main body 102 by welding. ing.

As shown in FIGS. 2 and 3, the pile body 100 has a lower end joint portion 104 (first connection portion) of the upper steel pipe 101 arranged on the steel pipe 101 at the upper end joint portion 103 (first connection portion) of the steel pipe 101. (2 connecting portions) are fitted externally and connected by a connecting portion 1 overlapped in the radial direction Q (see FIG. 7) which is orthogonal to the axial direction P of the pile body 100.
Further, in the present embodiment, the main body portion 102 and the upper end joint portion 103 of the steel pipe 101 are joined by a welded portion in which they are welded to each other. As shown in FIG. 1, since the steel pipe 101 located at the uppermost portion does not have the steel pipe 101 arranged above it, the upper end joint portion 103 is not provided at the upper end of the main body portion 102.
Here, in the present embodiment, if necessary, the press-fitted lower steel pipe 101 will be referred to as a lower steel pipe 101A, and the steel pipe 101 connected to the lower steel pipe 101A will be referred to as an upper steel pipe 101B.

The upper end joint portion 103 is formed with a plurality of through holes 10 arranged at the same intervals along the circumferential direction R (see FIG. 5). These through holes 10 are formed in a circular shape with substantially the same diameter from the outer peripheral surface 103a to the inner peripheral surface 103b of the upper end joint portion 103 (see FIG. 7). The through holes 10 are arranged at two positions spaced apart along the axial direction P. The through hole 10 of the upper end joint portion 103 of the lower steel pipe 101A is closed from the outside in the radial direction Q (see FIG. 7) by the lower end joint portion 104 of the upper steel pipe 101B in a state where the upper steel pipe 101B is fitted outward, and overlaps with each other. There is. The relative positions of the lower steel pipe 101A and the upper steel pipe 101B in the circumferential direction R have not been determined. Therefore, the connection structure does not require alignment of the circumferential direction R between both steel pipes 101A and 101B.

Next, an example of the press-fitting machine 200 used when the above-mentioned pile body 100 is press-fitted into the ground A will be described.
As shown in FIG. 4, the press-fitting machine 200 has a main body 201, a support portion 202 provided on the main body 201 for gripping a reaction force receiver generated at the time of press-fitting, and an axial direction with respect to the main body 201. A chuck frame 203 (grip device) movably provided in the press-fitting direction M of the pile body 100 to be P is provided. The support portion 202 has a foundation grip portion 202a that can be fitted and detached from the inner peripheral surface of the steel pipe 101 by approaching and separating from each other. In this embodiment, the three steel pipes 101 are provided with three foundation grip portions 202a so that they can receive reaction forces.
In FIG. 4, three steel pipes 101 that have already been installed are used as reaction force receivers, but if the required number of reaction force receivers is not installed, reaction force receivers corresponding to the steel pipes 101 are installed in advance. It is gripped by the support portion 202.

The support portion 202 is provided so as to be movable with respect to the main body portion 201 in the direction N intersecting the press-fitting direction M. The main body 201 is provided with a basic movement drive unit (not shown) for moving the support unit 202. Therefore, by moving the support portion 202 relative to the main body portion 201 by a foundation moving drive portion (not shown) while holding the steel pipe 101 that receives the reaction force, the main body portion 201 is mounted on the installed steel pipe 101. It is possible to move and press-fit the steel pipe 101 into the new installation position S. The foundation grip portion 202a may be provided to such an extent that it can receive the reaction force generated during press fitting, and the number thereof can be arbitrarily changed.

The chuck frame 203 includes a main cylinder 204 that moves the chuck frame 203 in the press-fitting direction M, and a chuck portion 205 that grips the steel pipe 101 to be press-fitted. As shown in FIGS. 5 and 6, the chuck portions 205 include chuck claws 20 (claw members) arranged in a ring shape (four in this case) and a chuck cylinder 208 for advancing and retreating the chuck claws 20 toward the steel pipe 101. And have. The press-fitted steel pipe 101 is inserted into the array of chuck claws 20 arranged in an annular shape, and the four chuck claws 20 grip the entire circumference.

The chuck cylinder 208 has a cylinder rod 208a, and is provided at two positions in one chuck claw 20 at the center in the width direction and spaced along the axis direction P. Then, by advancing the chuck claw 20 by the driving force of the chuck cylinder 208, the contact surface 21a of the chuck 20 can be brought into contact with the outer peripheral surface of the steel pipe 101 at a predetermined pressure to grip the steel pipe 101. At the same time, the state in which the steel pipe 101 is gripped can be released by retracting the chuck claw 20.

The chuck frame 203 is provided with a chuck rotation drive unit (not shown) for rotating the chuck portion 205 around the axis L100 of the steel pipe 101 for press-fitting. Therefore, if the chuck rotation drive unit and the main cylinder 204 (not shown) are driven while the steel pipe 101 is gripped by the chuck claws 20, the steel pipe 101 is rotated around the axis L100 and with respect to the ground A in the press-fitting direction M. It is possible to push in (that is, rotary press-fit) or pull out.
The four chuck claws 20 are individually and detachably provided with respect to the chuck cylinder 208.

Here, the chuck claw 20 will be specifically described with reference to FIGS. 5 to 15. Of these, FIG. 8 is a front view of the chuck claw 20 as viewed from the contact surface 21a side. FIG. 9 is a side view of the chuck claw 20 and is a view seen from the left side of the paper surface in FIG. 8, but the view seen from the right side of the paper surface also has the same side surface. 10 is a top view of the chuck claw 20, FIG. 11 is a bottom view of the chuck claw 20, and FIG. 12 is a rear view of the chuck claw 20. That is, FIGS. 8 to 12 show six views of the chuck claw 20.

The chuck claw 20 includes a claw body 21 having a contact surface 21a formed with a curvature corresponding to the curvature of the outer peripheral surface of the press-fitted steel pipe 101 shown in FIGS. 5 and 6, and a steel pipe 101 (upper steel pipe in this embodiment). It includes a pressing portion 22 that can press the outer peripheral surface of 101B) to plastically deform it, and a reaction force support portion 23 that receives the reaction force of the pressing portion 22.
The claw body 21 is formed in a curved plate shape with the same curvature as the contact surface 21a. A reaction force support portion 23 is fixed to the outer peripheral surface 21b on the opposite side of the contact surface 21a forming the inner peripheral surface of the claw body 21.

The pressing portion 22 is built in the claw main body 21, is arranged at the center in the width direction on the contact surface 21a, and is provided at two locations spaced apart along the axial direction P. The pair of pressing portions 22 are provided so as to be able to come and go from the contact surface 21a of the claw body 21 with a predetermined protruding length by a pressing cylinder 25 connected to each hydraulic pipe 251 (see FIG. 12). The protruding dimension of the pressing portion 22 is set to an appropriate size so that the steel pipe 101 located outside the radial direction Q pressed and plastically deformed by the pressing portion 22 can be inserted into the through hole 10 of the inner upper end joint portion 103. ing. The pair of pressing portions 22 built in each claw body 21 are driven independently or in conjunction with each other by the pressing cylinder 25.

Further, as shown in FIG. 7, the pressing portion 22 is formed in a circular shape in which the tip shape of the tip portion 22a is smaller than the through hole 10 formed in the upper end joint portion 103 of the steel pipe 101. Here, the outer diameter of the pressing portion 22 is set by the thickness and strength of the steel pipe 101, the driving force of the chuck cylinder 208, and the like. The distance between the centers C2 and C2 of the pair of pressing portions 22 and 22 substantially coincides with the distance between the centers C1 and C1 of the through holes 10 and 10 formed in the upper end joint portion 103 of the steel pipe 101. There is.

The reaction force support portion 23 is provided on the outer peripheral surface 21b of the claw body 21, and the base end portion 25a (see FIG. 13) of the pressing cylinder 25 is fixed. The reaction force support portion 23 has a box shape formed in a rectangular shape when viewed from the outside in the radial direction Q in FIG. 12, and gradually increases from each of the four side surfaces 23a toward the outer peripheral surface 21b of the claw body 21. A support plate 231 that inclines away from is attached. A chuck cylinder 208 is mounted on the inside of the reaction force support portion 23 from the top surface 23b side.

Then, in the contact surface 21a of the claw body 21, a plurality of embedded parts for locking the steel pipe 101 to the outer peripheral surface of the steel pipe 101 when the chuck portion 205 grips the steel pipe 101 at a position on the outer peripheral edge side of the contact surface 21a. The claw 24 is arranged. The embedded claw 24 is arranged so as to slightly project from the contact surface 21a.

Further, the press-fitting machine 200 shown in FIG. 4 is provided with a positioning means (not shown) for positioning the pressing portion 22 at predetermined positions in the axial direction P and the circumferential direction R on the peripheral surface of the pile body 100. As the positioning means, for example, one using a sensor, one by mechanical fitting, or the like can be adopted. When the positioning means is a sensor, for example, a detected portion is provided in advance at a predetermined position on the steel pipe 101, and a sensor capable of detecting the detected portion is provided on the claw body 21 shown in FIG. Can be done. In this case, since the positions of the sensor and the pressing portion 22 are constant, the chuck claw 20 is stopped at the position where the sensor detects the detected portion, so that the pressing portion 22 is inserted into the through hole 10 sandwiching the steel pipe 101. It can be positioned at opposite positions.
Further, when the positioning means is mechanically fitted, for example, the steel pipe 101 and the chuck frame 203 are mechanically positioned by fitting the unevenness. That is, a convex portion (or concave portion) may be provided on the outer peripheral surface of the steel pipe 101, and a concave portion (or convex portion) fitted therein may be provided on the chuck frame 203 or the chuck claw 20.

FIG. 16 is a horizontal cross-sectional view showing a state when the steel pipes 101 are connected to each other, and shows a state in which the first pile deformation prevention device 300 used at the time of this connection is arranged in the steel pipe 101.
The first pile deformation prevention device 300 is on the opposite side of the pressing portion 22 sandwiching the connecting portion 1 in which the upper end joint portion 103 of the lower steel pipe 101A and the lower end joint portion 104 of the upper steel pipe 101B overlap (inside the steel pipe 101 in the present embodiment). ) Has a holding support plate 303 (reaction wall) that presses the inner surface of the lower steel pipe 101A (inner peripheral surface 103b of the upper end joint portion 103) with a surface. That is, the first pile deformation prevention device 300 includes the support main body 301, a plurality of (here, four) holding jacks 302 provided on the support main body 301 so as to be expandable and contractible, and the above-mentioned above-mentioned provided at the protruding tip of the holding jack 302. The holding support plate 303 and the like are provided.

The support main body 301 is formed in a substantially square shape in a plan view seen from one side of the axial direction P, has a suspension portion (not shown), and by locking a wire to the suspension portion, a lifting machine such as a crane is used. It is provided so that it can be hung by.
The holding jacks 302 are arranged at the four corners of the support main body 301 and are provided so as to be expandable and contractible in the radial direction Q.

The holding support plate 303 is provided so as to be projectable toward the outside in the radial direction Q. Note that, in FIG. 16, the holding support plates 303 and 303 arranged in the vertical direction of the paper surface are in contact with the inner peripheral surface 103b of the upper end joint portion 103, and are held in the horizontal direction of the paper surface. The support plates 303 and 303 show a state in which they do not come into contact with the inner peripheral surface 103b of the upper end joint portion 103. The holding support plate 303 is formed with a support surface 303a formed to have a curvature corresponding to the curvature of the inner peripheral surface of the steel pipe 101 to be press-fitted. As a result, when pressed by the pressing portion 22, the connecting portion 1 of the steel pipe 101 is sandwiched between the contact surface 21a of the chuck claw 20 and the support surface 303a of the holding support plate 303.
In the case of the first pile deformation prevention device 300, it is preferable to provide a positioning means for fixing the first pile deformation prevention device 300 at a predetermined position in the steel pipe 101 as well as the positioning means for the pressing portion 22. Also in this case, one using a sensor or one that is mechanically fitted can be adopted.

Next, a joint method for connecting the steel pipes 101 to each other by the press-fitting machine 200 as described above will be described by including the method for constructing the pile body 100 configured by connecting the steel pipes 101.
FIG. 4 shows a state in which a plurality of pile bodies 100 are already installed on the ground A and a next pile body 100 is installed. Installation of the pile body 100 on the ground A is performed by carrying out the press-fitting step S10, the arranging step S20, and the joint step S30 that constitute the method for constructing the pile body 100 of the present embodiment.

In the press-fitting step S10, first, the steel pipe 101 (lower steel pipe 101A) is press-fitted (rotationally press-fitted) while being rotated to the ground A by the press-fitting machine 200.
As shown in FIG. 4, the lower steel pipe 101A is press-fitted by such a press-fitting machine 200. Then, when the press-fitting of the lower steel pipe 101A is completed to a position where the upper end joint portion 103 of the lower steel pipe 101A can be gripped by the chuck portion 205, the arrangement step S20 and the joint step S30 by the joint method in the present embodiment are performed as the next step. To carry out.

The arranging step S20 is a pile component arranging step of arranging the upper steel pipe 101B connected to the lower steel pipe 101A with respect to the lower steel pipe 101A (steel pipe 101) press-fitted in the previous step by overlapping both joint portions 103 and 104. It has S21 and a pressing portion positioning step S22 in which the pressing portion 22 is arranged so as to face the position overlapping the through hole 10 in the connecting portion 1 after the pile constituent member arranging step S21.

In the pile component arranging step S21, the chuck frame 203 is first raised with respect to the main body 201 in the press-fitting machine 200 to move the chuck portion 205 to a position separated upward from the lower steel pipe 101A press-fitted in the press-fitting step S10. Let me. Next, as shown in FIG. 17, the upper steel pipe 101B newly connected by a crane or the like (not shown) is suspended, and the chuck claw 20 of the press-fitting machine 200 is advanced to the upper steel pipe 101B inserted into the chuck portion 205. Holds the upper steel pipe 101B.

Next, as shown in FIG. 18, in the press-fitting machine 200, the chuck frame 203 is lowered with respect to the main body portion 201 to lower the upper steel pipe 101B gripped by the chuck portion 205, and the lower side press-fitted in the press-fitting step S10. The lower end joint portion 104 of the upper steel pipe 101B is fitted onto the upper end joint portion 103 of the steel pipe 101A.
Here, by grasping the upper steel pipe 101B to be connected by using the press-fitting machine 200, the axis L100 of the lower steel pipe 101A to be press-fitted and the upper steel pipe 101B to be connected can be aligned, and the upper end of the lower steel pipe 101A can be aligned. The joint portion 103 can be easily fitted to the lower end joint portion 104 of the upper steel pipe 101B.

Next, the pressing portion positioning step S22 is performed.
In the pressing portion positioning step S22, as shown in FIGS. 5, 6 and 19, after the pile component arranging step S21, the four chuck claws 20 and the pressing portions 22 provided on the respective chuck claws 20 are accommodated. Each pressing portion 22 is arranged so as to face a position overlapping the through hole 10 in the lower end joint portion 104 of the upper steel pipe 101B. At this time, the pressing portion 22 is positioned at four positions shifted by 90 degrees in the circumferential direction R. The contact surface 21a of the claw body 21 is in a state of being separated from the outer peripheral surface of the upper steel pipe 101B to the outside in the radial direction Q. Here, in the present embodiment, the lower end joint portion 104 is fitted outside the upper end joint portion 103, the through hole 10 is covered by the lower end joint portion 104, and the through hole is from the outer peripheral side of the connection portion 1. 10 is invisible. Therefore, in the positioning of the pressing portion 22, for example, a detection sensor (positioning means described above) is used to detect a detected portion provided at a predetermined position on the steel pipe 101 in advance, so that the through hole 10 is positioned as shown in FIG. The center C1 and the center C2 of the pressing portion 22 can be aligned on the coaxial line.

Next, the joint step S30 is carried out.
In the joint step S30, first, as shown in FIG. 16, the first pile deformation prevention device is located at a predetermined position on the side opposite to the pressing portion 22 sandwiching the connecting portion 1 of the steel pipes 101A and 101B, that is, on the inner peripheral side of the lower steel pipe 101A. 300 is arranged, and the holding jack 302 is extended so that the four holding support plates 303, 303, ... Are projected outward in the radial direction Q and brought into contact with the inner peripheral surface 103b of the upper end joint portion 103 of the lower steel pipe 101A. Keep it. The position of the holding support plate 303 at this time is a position facing the pressing portion 22 positioned in the pressing portion positioning step S22 described above via the steel pipe 101, and a through hole into which the plastic deformation portion 104A of the lower end joint portion 104 is inserted. 10 is closed by the support surface 303a of the holding support plate 303 from the inside in the radial direction Q.

Next, as shown in FIGS. 20 to 22, the pressing cylinder 25 of the chuck claw 20 is driven to project each of the pressing portions 22 provided on the four claw main bodies 21 from the contact surface 21a by a predetermined amount of protrusion. .. In this state, as shown in FIGS. 23 to 25, the chuck cylinder 208 is driven to advance the chuck claw 20 toward the inside in the radial direction Q, so that the steel pipe 101 is gripped by the four chuck claws 20. It becomes. As the chuck claw 20 moves at this time, the pressing portion 22 protruding from the contact surface 21a also advances toward the steel pipe 101 at the same time. Therefore, the pressing portion 22 pushes the upper steel pipe 101B with a force corresponding to the driving force of the chuck cylinder 208. The lower end joint portion 104 can be pressed, and the pressed portion of the lower end joint portion 104 can be plastically deformed so as to be inserted into the through hole 10 toward the upper end joint portion 103. Then, the plastic deformed portion 104A formed in the lower end joint portion 104 of the upper steel pipe 101B is inserted into the through hole 10 of the lower steel pipe 101A and engaged with the steel pipes 101A and 101B, so that the steel pipes 101A and 101B are connected to each other. In addition, in FIGS. 20 to 25, the first pile deformation prevention device 300 is omitted.
Here, it is desirable to manage the driving force of the chuck cylinder 208 so as to be a preset force in order to push the lower end joint portion 104 with a constant force by the pressing portion 22.
By keeping the protruding amount of each pressing portion 22 constant, the pushing force received by the steel pipe 101 at the time of pressing is balanced in the circumferential direction R, and the deformation of the steel pipe 101 can be prevented.

Further, in the joint step S30, as shown in FIG. 16, when the lower end joint portion 104 is pressed by the pressing portion 22 to be plastically deformed, the peripheral surface of the steel pipe 101 opposite to the pressing side by the pressing portion 22, that is, the steel pipe Since the holding support plate 303 of the first pile deformation prevention device 300 is arranged in contact with the inner peripheral surface of the 101, it is possible to suppress the deformation of the peripheral portion of the steel pipe 101 except for the plastic deformation portion 104A. ..
Further, since the deformation of the pile body 100 (steel pipe 101) at the time of pressing by the pressing portion 22 is suppressed, the plastic deformed portion 104A can be reliably formed with a desired size and shape.

Of the plurality of through holes 10 formed in the upper end joint portion 103 by the steps up to this point, the plastic deformed portion 104A pressed by the lower end joint portion 104 is engaged with the four through holes 10 in the circumferential direction R. Then, in the present embodiment, the plastic deformation portion 104A is engaged with all the through holes 10 formed in the upper end joint portion 103.
Specifically, after the plastic deformed portion 104A is engaged with the through holes 10 at the above four locations, the chuck cylinder 208 is driven to move the chuck claw 20 to the outside in the radial direction Q to hold the steel pipe 101 in a gripping state. release. Therefore, the pressing state of the pressing portion 22 against the steel pipe 101 is also released. Next, the pressing portion 22 is rotated in one direction of the circumferential direction R to perform the pressing portion positioning step S22 described above, and a through hole adjacent to the through hole 10 in which the plastic deformation portion 104A is engaged is adjacent to the through hole 10 in the circumferential direction R. After positioning the pressing portion 22 at the position corresponding to 10, the joint step S30 is performed again. By repeatedly performing the pressing portion positioning step S22 and the joint step S30, the plastic deformation portion 104A of the lower end joint portion 104 is engaged with all the through holes 10 formed in the circumferential direction R of the upper end joint portion 103. By doing so, the connection between one steel pipe 101 and the other steel pipe 101 is completed.

Next, the press-fitting step S10 is performed again.
That is, as shown in FIG. 26, in the press-fitting machine 200, the chuck portion 205 is rotated while gripping the steel pipe 101, and the chuck frame 203 is moved downward to press-fit the steel pipe 101 while rotating it. Then, once the steel pipe 101 is press-fitted by the stroke of the chuck frame 203, the grip of the steel pipe 101 by the chuck portion 205 is once released. Next, after the chuck portion 205 is moved upward, the steel pipe 101 is gripped and rotated by the chuck portion 205 again and press-fitted. This is repeated, and when the lower steel pipe 101A is press-fitted until the portion directly below the upper end joint portion 103 of the lower steel pipe 101A is in a position where it can be gripped by the chuck portion 205, the main press-fitting step S10 is completed, and the arrangement step S20 and the joint step are performed again. Carry out S30.
In this way, the press-fitting process S10, the arranging process S20, and the joint process S30 are repeated, a planned number of steel pipes 101 are connected and press-fitted, and if necessary, a predetermined position (not shown) or the like is used. After press-fitting to the planned level), the entire process for each pile body 100 is completed, and the pile body 100 having a predetermined length is installed on the ground A.

Next, the method of joining the pile constituent members of the present embodiment, the method of constructing the pile body 100, the press-fitting machine 200, and the operations of the chuck claw 20 (claw member) will be described with reference to the drawings.
In the present embodiment, as shown in FIG. 6, by externally fitting the lower end joint portion 104 of the upper steel pipe 101B to the upper end joint portion 103 provided in the press-fitted lower steel pipe 101A, both joint portions 103, The 104 are overlapped and arranged. Next, as shown in FIGS. 20 and 21, the pressing portion 22 housed in the chuck claw 20 is arranged so as to face the portion overlapping the through hole 10 in the lower end joint portion 104 of the upper steel pipe 101B. After that, as shown in FIGS. 23 and 24, the pressing portion 22 is projected from the contact surface 21a of the chuck claw 20, and the peripheral surface of the lower end joint portion 104 is pressed by the pressing portion 22 to press the lower end joint portion 104. By plastically deforming the formed portion toward the upper end joint portion 103 in the radial direction Q of the pile body 100, the plastically deformed portion 104A of the lower end joint portion 104 is inserted into the through hole 10 and engaged. As a result, the upper end joint portion 103 and the lower end joint portion 104 are integrally connected, and the steel pipes 101A and 101B can be connected to each other.

As described above, in the present embodiment, the steel pipes 101A and 101B forming the pile constituent members can be easily and efficiently connected to each other by a simple joint method of simply pressing with the pressing portion 22, so that the construction cost and construction cost are increased. The construction period can be reduced.
Here, the upper end joint portion 103 and the lower end joint portion 104 of each steel pipe 101 do not need to have a complicated shape, and the pressing portion 22 also has at least one of the upper end joint portion 103 and the lower end joint portion 104 (this implementation). In the above form, only the lower end joint portion 104) may be pressed to have a pressing force that can be plastically deformed, and since it is not necessary to use a complicated connecting device, the cost can be reduced.
Further, the through hole 10 formed in the upper end joint portion 103 of one steel pipe 101 need only be formed at a position where it can be overlapped with the lower end joint portion 104 of the other steel pipe 101, and does not need to have a complicated shape.

According to the present embodiment, since the pressing portion 22 is housed inside the claw body 21 of the chuck claw 20 of the press-fitting machine 200 so as to appear and disappear, the chuck portion of the press-fitting machine 200 is used as the pressing force required for the pressing portion 22. Since the gripping force of the chuck cylinder 208 used for the 205 can be utilized, it is not necessary to separately provide a device provided with a dedicated pressing portion, and the construction period and cost can be reduced.

Further, in the present embodiment, for example, the lower end joint portion 104 of the other steel pipe 101 is superposed on the outer peripheral side of the upper end joint portion 103 of one steel pipe 101 in which the through hole 10 is formed, and the lower end joint portion thereof is arranged. When the pressing portion 22 is plastically deformed by the pressing portion 22 and inserted into the through hole 10 for engagement, the pressing portion 22 may be positioned so as to face a position overlapping the through hole 10 in the lower end joint portion 104 by a positioning means. it can. That is, since the pressing portion 22 is positioned by the positioning means, the pile body 100 can be plastically deformed at an appropriate pressing position.

Further, in the present embodiment, since the chuck claw 20 provided with the pressing portion 22 can be attached to and detached from the chuck frame 203 of the chuck portion 205, only the chuck claw 20 of the generally used press-fitting machine 200 is used. This can be achieved by simply replacing the chuck claw 20 provided with the pressing portion 22. Therefore, the steel pipes 101 and 101 can be easily connected to each other by plastically deforming the connecting portion of the pile body 100 by pressing with the pressing portion 22 as described above by using the press-fitting machine conventionally used. It is not necessary to provide a press-fitting device.
Further, in the present embodiment, there is an advantage that the chuck claw 20 having a shape suitable for the pile body conditions such as the pile diameter and the pile thickness and having the pressing portion 22 may be selected and mounted on the chuck frame 203.

Although the method of joining the pile constituent members, the method of constructing the pile body, the press-fitting machine, and the embodiment of the claw member according to the present invention have been described above, the present invention is not limited to the above-described embodiment. It can be changed as appropriate without departing from the purpose.

For example, in the present embodiment, the connecting portion 1 is pressed by the pressing portion 22 from the outer peripheral side of the steel pipe 101, but it is also possible to press by the pressing portion 22 from the inner peripheral side of the steel pipe 101. is there. Further, the portion where the through hole 10 is formed is the upper end joint portion 103 of the press-fitted lower steel pipe 101A in the present embodiment, but the present invention is not limited to this, and the through hole 10 is formed in the lower end joint portion 104 of the upper steel pipe 101B. It may be provided. In this case, the device provided with the pressing portion 22 is arranged inside the steel pipe 101, and the pressing portion 22 is advanced toward the outside in the radial direction Q to press the inner upper end joint portion 103 and become convex outward. The plastic deformed portion can be plastically deformed as described above, and the plastically deformed portion can be inserted into the through hole 10 of the outer lower end joint portion 104 to engage with the steel pipes 101 and 101 in the same manner as in the above-described embodiment. it can.

Further, the upper end joint portion 103 is provided in the lower steel pipe 101A, and the upper end joint portion 103 is inserted and connected to the inside of the lower end joint portion 104 of the upper steel pipe 101B, but the lower end joint portion 104 is the lower steel pipe 101A. It may be inserted and connected to the inside of the upper end joint portion 103. Further, the upper end joint portion 103 is not limited to having a smaller diameter than the main body portion 102, and can have a larger diameter.
The structure of the steel pipe 101 is not limited to the above-described embodiment. For example, in the present embodiment, the upper end joint portion 103 is joined to the main body portion 102 of the steel pipe 101 by a welded portion, but the main body is as shown in the pile body 100A according to the first modification shown in FIG. It is also possible to use the reduced diameter cylinder 105 formed by reducing the diameter of the upper end portion of the portion 102 by press working as the upper end joint portion. That is, as shown in FIG. 27, in the lower steel pipe 101A, the main body portion 102 and the reduced diameter cylinder 105 having a diameter smaller than that of the main body portion 102 and having a tubular shape are continuously provided via the stepped portion 105a, and the diameter is reduced. A plurality of through holes 10 are formed in the cylinder 105.

Further, when pressing with the pressing portion 22 from the inner peripheral side of the steel pipe 101, the pressing portion 22 is installed together with the pressing cylinder in the holding support plate 303 forming the reaction force wall of the first pile deformation prevention device 300. Is also possible. In this case, when pressing, the pressing portion 22 is projected from the support surface 303a of the holding support plate 303, and then the holding jack 302 is driven to advance the pressing portion 22 together with the holding support plate 303 toward the steel pipe 101 side. Can be made to.

Further, in the present embodiment, a joint method in which a plurality of through holes 10 are formed in the upper end joint portion 103 of the lower steel pipe 101A, and the plastic deformation portion 104A of the lower end joint portion 104 of the upper steel pipe 101B is engaged with the through holes 10. However, the present invention is not limited to the provision of the through hole 10, and a joint method having a configuration in which the through hole 10 is not provided may be adopted.
That is, in the present embodiment, only the lower end joint portion 104 of one of the steel pipes 101A and 101B (outer peripheral side) arranged so as to be overlapped with each other is plastically deformed by pressing, but the inner peripheral side and the outer peripheral side arranged so as to be overlapped with each other are plastically deformed. By simultaneously pressing both steel pipes 101A and 101B from the outer peripheral side or the inner peripheral side with the pressing portion to plastically deform them, it is possible to form a plastically deformed portion in which both steel pipes 101A and 101B are overlapped and engaged with each other. In this case, since the thickness of the steel pipe 101 that is plastically deformed by the pressing portion is the thickness of the upper end joint portion 103 and the lower end joint portion 104 that are connected to each other, it is necessary to secure a large pressing force.

Further, in the above-described embodiment, as the procedure of the joint step S30, the pressing portion 22 is first projected from the contact surface 21a of the claw body 21, and the chuck cylinder 208 is driven in that state to drive the chuck cylinder 208 to make the chuck claw 20 into the steel pipe 101. Although it is a method of advancing toward, it is not limited to such a procedure. For example, a state in which the chuck cylinder 208 is first driven to grip the steel pipe 101 with the chuck claw 20, that is, the contact surface 21a is brought into contact with the peripheral surface of the steel pipe 101, and then the pressing cylinder 25 is driven to drive the pressing portion 22. May be projected to press the lower end joint portion 104 to cause plastic deformation. In this case, since the driving force of the pressing cylinder 25 becomes the pushing force of the pressing portion 22, the thickness of the target steel pipe 101 is larger than the thickness of the target steel pipe 101 when the driving force of the chuck cylinder 208 is used as the pushing force as in the above-described embodiment. Suitable when using a thin steel pipe.

Furthermore, in the present embodiment, the pressing portion 22 is integrally built in the claw body 21, and is used as the pressing force of the pressing portion 22 by utilizing the gripping force of the chuck claw 20. However, the present invention is not limited to this, and the pressing portion 22 and the claw body 21 may be provided separately. Further, the pressing portion 22 may not be provided in the press-fitting machine 200. In this case, the pressing force of the pressing portion 22 needs to be provided separately from the gripping force of the chuck claw 20. There is no change in the method of forming plastic deformation on the steel pipe 101 by the pressing portion.

Further, in the present embodiment, the plastic deformation portion 104A of the lower end joint portion 104 is inserted into all the through holes 10 formed in the upper end joint portion 103, but all the through holes 10 are not necessarily used for engagement. If the connection strength can be ensured, it is possible to omit the engagement of the plastic deformation portion 104A with a part of the through holes 10. For example, when two through holes 10 are arranged along the axial direction P (vertical direction) as in the present embodiment, the through holes 10 are alternately arranged vertically (in a staggered manner) along the circumferential direction R. Engagement may be performed.

Further, the through hole 10 has been described as a circular through hole, but the present invention is not limited to this. For example, it may have a different shape such as a rectangular hole. Further, the through hole 10 may be a recess that does not penetrate. The point is that it may be a recess that opens on the pressing portion 22 side, and is not necessarily limited to a structure that penetrates the steel pipe 101 in the thickness direction. The structure of the through holes 10 is such that the through holes 10 are arranged in two rows in the axial direction P at a predetermined pitch in the circumferential direction R of the upper end joint portion 103, but even one row in the axial direction P is arranged in three or more rows. It may be, and the pitch in the circumferential direction R can be changed as appropriate.

Further, the pile body 100B according to the second modification shown in FIG. 28 has a reduced diameter cylinder 105 formed by the press working of FIG. 27 described above, and alternately (staggered) so as to be different in position in the circumferential direction R. The through holes 10 are arranged (in a shape). In this case, since the through hole 10 is obliquely displaced, the shearing force in the axial direction P acting on the pile body 100B is unlikely to act on the engaging portion of the through hole 10.
Even when the through holes 10 are arranged in a staggered pattern as in the second modification, the upper end joint portion is joined to the main body portion 102 of the steel pipe 101 by a welded portion, not limited to the press-processed reduced diameter cylinder 105. It can be applied to the welded joint.

Further, the configuration of the first pile deformation prevention device 300 is not limited to the configuration provided with the holding jack 302 that expands and contracts in the radial direction Q as in the present embodiment. For example, the second pile deformation prevention device 300A of the third deformation example shown in FIG. 29 includes four holding support plates 303 arranged on the inner peripheral side of the steel pipe 101 and provided at regular intervals in the circumferential direction R. ing.
These holding support plates 303 are fixed to the outer peripheral surface 306a of the annular support portion 306 provided substantially coaxially with the steel pipe 101. The annular support portion 306 has a substantially semi-ring-shaped first ring 306A and a second ring 306B divided into two in the circumferential direction R so that the first ring 306A and the second ring 306B are substantially annular. It is connected by a connecting portion (first connecting portion 307A and second connecting portion 307B). The first connecting portion 307A is a hinge portion that rotatably supports one end portions of the first ring 306A and the second ring 306B with the axial direction P as the rotation axis. The second connecting portion 307B is an expansion cylinder that connects the other ends of the first ring 306A and the second ring 306B. That is, the annular support portion 306 is configured to expand or contract by driving the second connecting portion 307B. Therefore, when the holding support plate 303 is brought into contact with the inner peripheral surface 103b of the upper end joint portion 103 of the lower steel pipe 101A, the cylinder of the second connecting portion 307B is extended at a predetermined position to expand the annular support portion 306. The four holding support plates 303 having a diameter can be brought into contact with the inner peripheral surface 103b of the upper end joint portion 103.

Furthermore, in the present embodiment, the press-fitted pile body 100 has been described as an application example of the joint method of the pile constituent members using the press-fitting machine 200, but the method is not limited to such a joint method. ..
For example, in the method of joining the pile constituent members according to another embodiment shown in FIG. 30, the pile transport device 400 (for example, pile runner: manufactured by Giken Seisakusho Co., Ltd.) is provided with a pressing portion 40 (see FIG. 31), and the pile body 100 is provided. This is a transport device for pile bodies 100 that can be moved along the upper ends of a plurality of existing piles B that are arranged sideways and continuously arranged in one direction. Here, the steel pipe 101 used is the same as that of the above-described embodiment.

The pile transfer device 400 grips the traveling device 401 movably provided along the existing pile B and the steel pipe 101 supported by the traveling device 401 and arranged sideways in the axial direction P from the outer peripheral side. The device 402 and the like are provided. The traveling device 401 is arranged in front of and behind the gripping device 402 in the traveling direction. The traveling device 401 supports a drive motor 403 equipped with a drive roller (not shown) and an existing pile B from both sides in a direction orthogonal to the moving direction of the pile transport device 400 in a top view, and supports a plurality of pressers. It comprises a side guide 404 with rollers 405. The side guide 404 moves while maintaining the state of sandwiching the existing pile B by pressing the side surface of the existing pile B and rolling the roller 405 with the drive of the drive roller.

The gripping device 402 includes a tubular gripping frame 406 into which the steel pipe 101 can be inserted, and a chuck claw 407 arranged on the inner peripheral side of the gripping frame 406 in the circumferential direction (four in this case) to grip the steel pipe 101. , Is equipped. The chuck claw 407 includes a chuck cylinder (not shown) that advances and retreats toward the steel pipe 101. The steel pipe 101 gripped by this is inserted into the array of chuck claws 407 arranged in the circumferential direction, and the range of substantially the entire circumference is gripped by the four chuck claws 407. A pressing portion 40 is incorporated in the chuck claw 407 together with a pressing cylinder (not shown).

A joint method using such a pile transfer device 400 will be described.
First, in the pile constituent member arranging step, one steel pipe 101A whose axial direction P is laterally arranged and the other steel pipe 101B are overlapped and arranged at the connecting portion 1 inside the gripping frame 406 of the gripping device 402. Next, in the joint process, the lower end joint portion 104 of the other steel pipe 101 is pressed by the pressing portion 40 provided so as to be able to press against the peripheral surface of the pile body 100 and plastically deformed, and the plastically deformed portion is plastically deformed by the one steel pipe. The steel pipes 101 and 101 are connected to each other by inserting and engaging with the through hole 10 formed in the upper end joint portion 103 of the 101. Since the detailed joint method is the same as that of the above-described embodiment, it is omitted here.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

1 Connection part 10 Through hole 20 Chuck claw 21 Claw body 21a Contact surface 22 Pressing part 24 Embedded claw 25 Pressing cylinder 40 Pressing part 100, 100A, 100B Pile body 101 Steel pipe (pile component)
101A Lower steel pipe 101B Upper steel pipe 102 Main body 103 Upper end joint (first connection)
103a Outer peripheral surface 103b Inner peripheral surface 104 Lower end joint (second connection)
104A Plastic deformation part 200 Press-fitting machine 203 Chuck frame (grasping device)
205 Chuck part 208 Chuck cylinder 300 1st pile deformation prevention device 300A 2nd pile deformation prevention device 302 Holding jack 303 Holding support plate (reaction wall)
303a Support surface 400 Pile transfer device 402 Gripping device 407 Chuck claw A Ground P Axial direction Q Radial direction R Circumferential direction

Claims (10)

It is a joint method of pile constituent members that connect the pile constituent members that make up the pile body by overlapping each other.
A pile constituent member arranging step of arranging a first connecting portion provided on one of the pile constituent members and a second connecting portion provided on the other pile constituent member in an overlapping manner.
While gripping the pile constituent members with each other by the chuck claws that grip the peripheral surface of the pile body, the pile constituent members are overlapped in the pile constituent member arranging step by the pressing portion provided so as to be able to press against the peripheral surface of the pile body. A joint step of connecting the pile constituent members by pressing at least one of the arranged first connecting portion and the second connecting portion to plastically deform the pile constituent members.
Have a,
When gripping the pile constituent members with the chuck claws, a driving force is applied to the chuck claws by two chuck cylinders arranged so that the respective central axes sandwich the pressing portion in the axial direction of the pile body. A method of joining pile components. A through hole or recess is provided in the first connection portion.
After the pile constituent member arranging step, the pile constituent members are gripped by the chuck claws , and the pressing portion is arranged so as to face a position overlapping the through hole or the recess in the second connecting portion. Has a positioning process
In the joint step, the second connecting portion is plastically deformed toward the first connecting portion by the pressing portion, so that the plastic deformed portion of the second connecting portion is inserted into the through hole or the recess. The method for joining pile constituent members according to claim 1, wherein the pile constituent members are combined and connected to each other. A pile deformation prevention device having a reaction force wall that abuts on the peripheral surface of the pile body is provided on the side opposite to the pressing portion that sandwiches the pile constituent member.
In the joint step, when at least one of the first connecting portion and the second connecting portion is pressed by the pressing portion, the reaction force wall is brought into contact with the peripheral surface of the pile body. The method for joining a pile component according to claim 1 or 2. A method for constructing a pile body by using the method of joining the pile constituent members according to any one of claims 1 to 3 and press-fitting the pile body into the ground by a press-fitting machine having the chuck claw .
A press-fitting process in which one of the pile constituent members constituting the pile body is gripped by the chuck claw and press-fitted into the ground.
An arrangement step of arranging the second connecting portion provided on the other pile constituent member so as to overlap the first connecting portion provided on one of the pile constituent members press-fitted in the press-fitting step.
The pile constituent members are formed by pressing at least one of the first connection portion and the second connection portion arranged so as to be overlapped in the arrangement step by the pressing portion provided in the press-fitting machine to plastically deform the pile constituent members. The joint process to connect and
A method of constructing a pile body, which is characterized by having. It is a press-fitting machine that grips the pile and press-fits it into the ground.
A chuck claw that can grip the peripheral surface of the pile body and
By pressing the peripheral surface of the pile body to plastically deform the pile body, a pressing portion capable of connecting the pile body to the end portion of another pile body arranged inside the pile body. ,
A press-fitting machine including two chuck cylinders, which are arranged so that their central axes sandwich the pressing portion in the axial direction of the pile body and apply a driving force to the chuck claws . Before SL pressing portion, the press-fitting machine according to claim 5, characterized in that is provided to be retractable from the peripheral surface abuts the abutment surface of the pile body of the chuck claws. The press-fitting machine according to claim 5 or 6, wherein a positioning means for positioning the pressing portion at a predetermined position on the peripheral surface of the pile body is provided. A claw member provided on a chuck portion capable of gripping the peripheral surface of the pile body in a press-fitting machine for gripping and press-fitting the pile body, and abutting on the peripheral surface of the pile body.
It has an abutting surface that comes into contact with the peripheral surface of the pile body.
The pile is provided so as to be able to appear and disappear from the contact surface, and by pressing the peripheral surface of the pile body to plastically deform the pile body, the pile is placed at the end of another pile body arranged inside the pile body. includes a pressing portion capable of connecting a body, a,
A claw member characterized in that a driving force is applied from two chuck cylinders arranged so that their central axes sandwich the pressing portion in the axial direction of the pile body . The chuck portion is provided with a chuck frame that can move in the axial direction and the circumferential direction of the pile body.
The claw member according to claim 8, wherein the claw member is detachably provided with respect to the chuck frame. It is a joint method of pile constituent members that connect the pile constituent members that make up the pile body by overlapping each other.
A pile constituent member arranging step of arranging a first connecting portion provided on one of the pile constituent members and a second connecting portion provided on the other pile constituent member in an overlapping manner.
With the pressing portion protruding from the contact surface of the chuck claw that grips the peripheral surface of the pile body, the chuck claw is advanced toward the peripheral surface of the pile body to bring the contact surface to the pile. The pile body is gripped by being brought into contact with the peripheral surface of the body, and is arranged on the outer side of the first connection portion and the second connection portion which are overlapped and arranged in the pile constituent member arrangement step by the pressing portion. The joint process of connecting the pile constituent members by pressing the piled one to plastically deform it.
A method of joining a pile component, which comprises.

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