CN113490778A

CN113490778A - Pile body joint, pile body connecting structure and pile body connecting method

Info

Publication number: CN113490778A
Application number: CN202080013124.7A
Authority: CN
Inventors: 北村精男; 吉川昌彦
Original assignee: Technical Research Institute Co ltd
Current assignee: Technical Research Institute Co ltd
Priority date: 2019-02-12
Filing date: 2020-02-12
Publication date: 2021-10-08
Also published as: EP3926098B1; SG11202108809QA; AU2020220777A1; JP2020133391A; AU2020220777B2; JP6854939B2; EP3926098A4; EP3926098A1

Abstract

The invention provides a pile body joint, a pile body connecting structure and a pile body connecting method capable of firmly integrating connected pile bodies. A joint (10) for joining two pile shafts (12) comprises: a tubular main body (16) into which a pile body (12) having a plug (14) on the circumferential surface thereof is fitted from the end (16A); and a fitting part (22) formed on the main body part (16) in such a manner that the pile body (12) is fitted into the plug (14) by being rotated. The fitting portion (22) is formed in a tapered shape having a surface (22A) inclined so as to be away from an end (16A) of the body portion (16) in the rotation direction of the pile body (12), or in a wedge shape fitted between the protruding portion and the pile body.

Description

Pile body joint, pile body connecting structure and pile body connecting method

Cross reference to related applications

The present application claims the benefits of patent application No. 2019-.

Technical Field

The invention relates to a pile body joint, a pile body connecting structure and a pile body connecting method.

Background

When the length of the pile body buried underground is not enough, the pile bodies are connected together to be buried.

Here, the welding work performed at the embedding site takes time and the welded portion needs to be inspected by the welded joint for connecting the pile bodies by welding, which requires a lot of time and labor. Further, due to weather and welder skill at the site of burying, welding quality may vary, and due to site conditions such as clearance limitation, the pile bodies may not be welded to each other in some cases.

On the other hand, as a mechanical connection without welding work at an embedding site, for example, patent document 1 discloses a method of connecting a plurality of cylindrical excavating members by a cylindrical joint member. A claw is projected from the outer periphery of one end of the cylindrical excavating member, and the engaging member is engaged with the claw and positioned.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. Sho 63-40088

Disclosure of Invention

Problems to be solved by the invention

However, in the structure described in patent document 1, the claw of the cylindrical excavating member and the engaging member are fitted and positioned, but the connected cylindrical excavating members are not firmly integrated.

Accordingly, an object of the present invention is to provide a pile body joint, a pile body connecting structure, and a pile body connecting method capable of firmly integrating connected pile bodies.

Means for solving the problems

The pile body joint of the present invention is a pile body joint for connecting two pile bodies, and includes: a tubular main body into which the shaft having the projection on the circumferential surface thereof is fitted from the end; and a fitting portion formed in the main body portion so as to be fitted to the protruding portion by fitting and rotating the pile body; the fitting portion is formed in a first shape having a surface inclined so as to be apart from the end portion of the main body in a rotation direction of the pile body, or in a second shape fitted between the protruding portion and the pile body.

According to this configuration, since the fitting portion is formed in the first shape having the surface inclined so as to be apart from the end portion of the main body in the shaft rotation direction, when the shaft is fitted into the shaft joint and rotated, the shaft advances in the fitting direction, in other words, in the direction of the other shaft connected by the shaft joint. As a result, the ends of the two pile bodies after connection abut against each other, and the inclined surface of the fitting portion and the surface of the projecting portion facing thereto also abut against each other, whereby the two pile bodies and the pile body joint are tightened. In this way, the two pile bodies and the pile body joint connected to each other can be firmly integrated by the first shape formed in the fitting portion.

Further, since the fitting portion is formed in the second shape to be fitted into the space between the protruding portion and the pile body, a so-called wedge effect is generated between the protruding portion and the fitting portion, and it is possible to prevent, for example, a displacement between the protruding portion and the fitting portion which may occur when the embedded pile body is pulled out. In this way, the shaft and the shaft joint can be firmly integrated by the second shape formed in the fitting portion.

In the pile body joint according to the present invention, the fitting portion may be formed in the second shape on the surface formed in the first shape. According to this structure, the two pile bodies and the pile body joint that are connected can be integrated more firmly.

In the pile body joint of the present invention, the projection may be formed in a planar shape, and the inner side of the planar shape may be hollowed out. When the outer periphery of the protruding portion is welded and the protruding portion is provided to the pile body, a weld (weld mark) may be generated on the outer periphery of the protruding portion, and the weld may prevent the protruding portion from being fitted to the fitting portion. According to this configuration, the welding bead is formed on the inner side of the plane by welding the hollowed inner side of the plane, so that the welding bead can be prevented from interfering with the fitting of the protruding portion and the fitting portion.

In the pile body joint according to the present invention, the plurality of projecting portions arranged at unequal angular intervals in the circumferential direction may be provided on the pile body, and the plurality of fitting portions corresponding to the plurality of projecting portions may be formed on the main body. According to this structure, the projecting portion is provided at a position in the cross-sectional direction where a relatively high strength is desired to be given to the pile body, whereby the strength of the pile body after the connection can be improved with a simple structure.

In the shaft joint according to the present invention, the main body may be provided with a reinforcing member that covers at least the fitting portion. According to this configuration, since the strength of the region in the main body portion where the fitting portion is formed is relatively reduced, the reduced strength can be increased by the reinforcing member.

The pile body joint of the present invention may further include a retaining member fixed to the reinforcing member for preventing the protrusion from being disengaged from the fitting portion. In this structure, the retaining member is fixed to the reinforcing member by, for example, bolting or inserting a pin formed in the retaining member into a hole formed in the reinforcing member, so that the protrusion provided in the pile body can be reliably prevented from coming off from the fitting portion.

In the pile body joint according to the present invention, a hole for confirming insertion of the projecting portion into the fitting portion may be formed in the reinforcing member. According to this configuration, even if the reinforcing member is provided, the worker can visually confirm the insertion state of the protruding portion into the fitting portion.

In the pile body joint according to the present invention, the fitting portion may be formed with a plurality of the first shapes or a plurality of the second shapes in an axial direction of the pile body. According to this configuration, since the plurality of first shapes or the plurality of second shapes are formed in one fitting portion, the connected pile bodies can be firmly integrated.

In the pile body joint according to the present invention, one of the two pile bodies may be the pile body buried under the ground, and the other of the two pile bodies may be a pile body for assisting in burying the one of the pile bodies, and may be disposed above the one of the pile bodies. According to this structure, the pile can be embedded without suspending the pile by connecting the other pile to assist embedding of one of the piles by the pile joint.

The pile body connecting structure of the present invention comprises: a pile body having a projection on a circumferential surface thereof; and a shaft joint having a tubular body into which the shaft is fitted from an end, wherein a fitting portion into which the shaft is fitted and rotated is formed with a first shape having a surface inclined so as to be separated from the end of the body in a rotation direction of the shaft or a second shape fitted between the protrusion and the shaft. According to this structure, the two pile bodies and the pile body joint that are connected can be integrated more firmly.

A pile body connecting method according to the present invention is a pile body connecting method for connecting two pile bodies by a pile body joint, the pile body joint having a tubular main body portion into which a pile body having a projecting portion on a circumferential surface thereof is fitted from an end portion, and a fitting portion into which the pile body is fitted and rotated and fitted with the projecting portion being formed with a first shape having a surface inclined so as to be apart from the end portion of the main body portion in a rotation direction of the pile body or a second shape fitted between the projecting portion and the pile body, the pile body connecting method including: a first step of burying the pile body; and a second step of erecting the other pile body on the embedded pile body and rotating the other pile body to fit the two pile bodies by the pile body joint. According to this structure, the two pile bodies and the pile body joint that are connected can be integrated more firmly.

A pile body connecting method according to the present invention is a pile body connecting method for connecting a first pile body and a second pile body by a pile body joint, the pile body joint having a tubular main body portion into which a pile body having a projection portion on a circumferential surface thereof is fitted from an end portion, and a fitting portion into which the pile body is fitted and rotated to be fitted with the projection portion being formed with a first shape having a surface inclined so as to be away from the end portion of the main body portion in a rotation direction of the pile body or a second shape fitted between the projection portion and the pile body, the pile body connecting method including: a first step of clamping the second pile body by a second clamping mechanism provided in the pile press; a second step of clamping the first pile body by a first clamping mechanism provided in the pile press; and a third step of connecting the first pile body and the second pile body by the pile body joint by moving the first clamping mechanism so that the first pile body abuts against an end of the second pile body and rotating the first clamping mechanism or the second clamping mechanism. According to this structure, the first and second gripping mechanisms grip the respective pile bodies and the two pile bodies are connected by the pile body joint, so that the two pile bodies can be connected more reliably.

Effects of the invention

According to the present invention, the connected pile bodies can be firmly integrated.

Drawings

Fig. 1 is an external view of a pile shaft and a joint according to a first embodiment, fig. 1(a) is a cross-sectional view of the joint, fig. 1(b) is a side view of the joint, fig. 1(c) is a cross-sectional view of the pile shaft, and fig. 1(d) is a side view of the pile shaft;

fig. 2 is a view showing a method of connecting a pile body and a joint according to a first embodiment, fig. 2(a) is a process of inserting the pile body into the joint, and fig. 2(b) is a view showing a process of rotating the pile body with respect to the joint;

fig. 3 is an enlarged view showing a state in which the plug of the first embodiment is fitted to the fitting portion;

fig. 4 is a vertical cross-sectional view of a portion of the pile body where the plug is provided and a portion of the joint where the fitting portion is formed, according to the first embodiment, fig. 4(a) is a view showing the pile body and the joint, respectively, and fig. 4(b) is a view showing a state where the pile body and the joint are connected to each other;

fig. 5 is a view showing the load transmission sites of the pile and the joint when the two piles of the first embodiment are connected, fig. 5(a) shows the load transmission sites when the pile is pressed in, fig. 5(b) shows the load transmission sites when the embedded pile is pulled out, and fig. 5(c) shows the load transmission sites when the pile is rotated;

fig. 6 is a view showing a process of connecting two pile bodies of the first embodiment and burying them underground using a pile driver, fig. 6(a) and 6(b) showing a process of fitting a fastener into one of the pile bodies, and fig. 6(c) showing a process of rotating the pile bodies to connect the two pile bodies by the fastener;

fig. 7 is an external view of the reinforcing member of the first embodiment;

fig. 8 is a view showing a method of connecting a pile body and a joint according to the first embodiment, fig. 8(a) is a process of inserting the pile body into the joint, and fig. 8(b) is a view showing a process of rotating the pile body with respect to the joint;

fig. 9 is a view showing the stopper according to the first embodiment, fig. 9(a) shows an inserted state of the stopper after the joint and the pile body are coupled, fig. 9(b) is an external view of the stopper, and fig. 9(c) is a view showing a positional change of the pin due to cantilever spring-back;

fig. 10 is a view showing a modification of the stopper according to the first embodiment, in which fig. 10(a) shows an inserted state of the stopper after the joint is coupled to the pile body, and fig. 10(b) is an external view of the stopper;

fig. 11 is an external view of a modified example of the pile body and the joint according to the first embodiment;

fig. 12 is an external view of a modified example of the pile body and the joint according to the first embodiment;

fig. 13 is an external view of the shaft and the joint according to the second embodiment;

fig. 14 is a view showing a process when a pile body is buried by using a pile driver according to a third embodiment, fig. 14(a) shows a state where a lower pile is coupled to a simple pile driver and a joint portion is held by the pile driver, fig. 14(b) shows a state where the lower pile is coupled to the simple pile driver and the lower pile is buried by the pile driver, and fig. 14(c) shows a state where the lower pile is coupled to an upper pile and the lower pile is further buried by the pile driver;

fig. 15 is a side view of a stepped claw provided in a collet of a pile driver according to a third embodiment;

fig. 16 is a view showing a process when a pile body is buried by using a pile press according to a fourth embodiment, fig. 16(a) shows a state where a lower pile is gripped by a sub-collet and an upper pile is gripped by a main collet, fig. 16(b) shows a state where a plug of the lower pile is inserted into a joint of the upper pile, fig. 16(c) shows a state where the plug of the lower pile is fitted into the joint of the upper pile by rotating the upper pile, and fig. 16(d) shows a state where the lower pile is coupled to the upper pile and the lower pile is further buried by the pile press;

fig. 17 is a schematic configuration view of a sub-cartridge provided in the pile driver according to the fourth embodiment;

fig. 18 is a view showing a stopper according to the fourth embodiment, in which fig. 18(a) is an external view showing a reinforcing member and a reverse stopper, fig. 18(b) is an a-arrow view, and fig. 18(c) is a side view showing a plug which passes over the reverse stopper and is fitted into a fitting portion.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples of the present invention, but the present invention is not limited to the specific configurations described below. When the present invention is implemented, the specific configuration according to the embodiment can be appropriately adopted.

(first embodiment)

Fig. 1 is an external view of a joint 10 and pile

bodies

12 and 12 constituting a pile body connecting structure according to the present embodiment. Fig. 1(a) is a cross-sectional view of the joint 10, fig. 1(b) is a side view of the joint 10, fig. 1(c) is a cross-sectional view of the shaft 12, and fig. 1(d) is a side view of the shaft 12.

The pile body 12 of the present embodiment is, for example, a pile buried underground, and the outer peripheral surface 12A thereof is provided with a pin 14 corresponding to a protruding portion of the present invention. Four pins 14 are provided on the outer circumferential surface 12A of the pile body 12, but this is merely an example, and one or more pins 14 may be provided on the outer circumferential surface 12A of the pile body 12. The plug 14 is planar, and an example thereof is a rectangular shape having four faces.

The connecting element 10 is used to connect two shaft parts 12, and corresponds to the shaft joint of the present invention. The joint 10 has a tubular body 16 into which the shaft 12 is fitted from each end 16A, and the inner circumference of the body 16 is formed slightly larger than the outer circumference of the shaft 12 so as to cover the outer circumference 12A of the shaft 12.

The body 16 has engaging portions 18 formed corresponding to the

end portions

16A and 16A to engage with the pins 14 of the pile body 12. That is, the joint 10 of the present embodiment has a symmetrical structure in the direction in which the pile body 12 is connected (also referred to as the "vertical direction"). In the main body 16 of the present embodiment, four engaging portions 18 are formed in the vertical direction so as to correspond to the shaft 12 provided with the four bolts 14.

The engaging portion 18 is formed by an insertion portion 20 into which the plug 14 is inserted from the end 16A of the body portion 16, and a fitting portion 22 into which the stem 12 is fitted and fitted with the plug 14 by rotating the plug 22. The insertion portion 20 is formed in a direction parallel to the axial direction of the pile body 12, and the fitting portion 22 is formed in a direction intersecting the axial direction of the pile body 12. With this configuration, the engaging portion 18 of the present embodiment has an "L" shape, but is not limited to this, and may have a shape in which the plug 14 inserted from the insertion portion 20 is fitted in a direction intersecting the axial direction of the pile body 12, and for example, the engaging portion 18 may have an inverted "T" shape.

Fig. 2 is a view showing a method of connecting two

pile sections

12 and 12 provided with a pin 14 and a joint 10. In the joint 10, one shaft 12 is fitted from one end 16A of the body 16, and the other shaft 12 is fitted from the other end 16A (fig. 2 (a)). Then, the shaft 12 is rotated, so that the plug 14 provided in the shaft 12 is fitted into and connected to the fitting portion 22 of the joint 10 (fig. 2 (b)).

The ends 12B, 12B of the two

pile sections

12, 12 connected by the joint 10 abut against each other. In other words, the positional relationship between the plug 14 provided in the pile 12 and the fitting portion 22 of the joint 10 is such that the

end portions

12B, 12B of the

piles

12, 12 abut against each other when the two

piles

12, 12 are connected by the joint 10. As an example, in the present embodiment, the plug 14 is provided on the pile body 12 so as to align the positions of the fitting portions 22 so that the

end portions

12B, 12B of the

pile bodies

12, 12 abut against each other at the central portion with respect to the height direction of the joint 10.

Next, the shapes of the plug 14 and the joint 10 will be described in detail with reference to fig. 3 and 4 of the present embodiment. Fig. 3 is an enlarged view showing a state in which the plug 14 is fitted to the fitting portion 22. Fig. 4 is a vertical cross-sectional view of a portion of the pile body 12 where the plug 14 is provided and a portion of the joint 10 where the fitting portion 22 is formed. Fig. 4(a) is a view showing the pile 12 and the joint 10, respectively, and fig. 4(b) is a view showing a state in which the pile 12 and the joint 10 are connected to each other.

As shown in fig. 3, the fitting portion 22 has a surface 22A inclined so as to be apart from the end portion 16A of the body portion 16 in the rotation direction x of the pile body 12, and is formed in a tapered shape corresponding to the first shape of the present invention. In other words, the surface 22A of the fitting portion 22 is inclined in the connecting direction of the two

pile bodies

12, 12 to be connected. The surface 22B facing the surface 22A is formed parallel to the end 16A of the body 16.

The plug 14 is formed in a shape corresponding to the tapered shape of the fitting portion 22. Specifically, the plug 14 has

surfaces

14A and 14B that intersect the axial direction of the pile body 12 and are provided to face each other. Surface 14B is located on the end 12B side of pile 12 and is formed parallel to end 12B of pile 12. On the other hand, the surface 14A is formed to be inclined in a direction approaching the end 12B of the pile body 12. The inclination angle of the surface 14A of the plug 14 is the same as the inclination angle of the surface 22A of the fitting portion 22.

Since the fitting portion 22 has a tapered shape having the inclined surface 22A, when the pile 12 is fitted into the joint 10 and rotated, the pile 12 advances in the fitting direction, that is, in the direction of the other pile 12 connected by the joint 10. As a result, the

end portions

12B and 12B connecting the two

pile bodies

12 and 12 abut against each other, and the inclined surface 22A of the fitting portion 22 also abuts against the surface 14A of the bolt 14 facing thereto, whereby the two pile bodies 12 and the joint 10 are fastened together. By a simple structure such as a taper shape formed in the fitting portion 22 in this manner, the two

pile bodies

12, 12 to be connected and the joint 10 can be firmly integrated.

As described above, in the

rigid pile sections

12 and 12 fastened together by the joint 10 having the tapered fitting section 22, the surface 22B of the fitting section 22 is not in contact with but spaced from the surface 14B of the plug 14.

As shown in fig. 4(a), the fitting portion 22 is formed in a wedge shape that fits between the plug 14 and the pile body 12 and corresponds to the second shape of the present invention. The wedge shape is formed by chamfering the surface 22A of the connection fitting portion 22 in the direction of the pile body 12. As described above, the surface 22A of the fitting portion 22 of the present embodiment is formed with both a tapered shape and a wedge shape.

The surface 14A of the plug 14 is also formed to be inclined in the direction of the pile body 12 so as to correspond to the wedge shape of the surface 22A of the fitting portion 22. That is, the surface 14A of the plug 14 and the outer peripheral surface 12A of the pile body 12 form a "V" shape, and the surface 22A of the fitting portion 22 is fitted to the "V" shape. This causes a so-called wedge effect between the fitting portion 22 and the plug 14, and prevents a possible displacement between the fitting portion 22 and the plug 14 when, for example, the embedded pile body 12 is pulled out (in the direction of arrow y1 in fig. 4 (b)). In this way, the pile body 12 and the joint 10 can be integrated more firmly by a simple structure such as a wedge shape formed in the fitting portion 22.

Further, if the outer periphery of the bolt 14 is welded to provide the bolt 14 to the pile body 12, a weld (weld mark) may be generated on the outer periphery of the bolt 14, and the weld may inhibit the fitting of the bolt 14 and the fitting portion 22. Therefore, a step of removing the bead by polishing or the like is required. Therefore, the inner side of the plane of the plug 14 of the present embodiment is hollowed out (see fig. 1). Further, by welding the hollowed planar inner side to form a weld bead on the planar inner side of the plug 14, the weld bead can be prevented from interfering with the fitting of the plug 14 and the fitting portion 22.

One example of the hollow shape 24 of the present embodiment is a rectangular shape, and three plugs 14 are provided along the circumferential direction of the pile body 12. The hollowed portion 24 may be formed in one or more than one of the pins 14, and the shape and size thereof are not limited as long as the welding work can be performed to set the pin 14 to the pile body 12.

Further, in the portion of the pile body 12 where the plug 14 is provided, the strength of the pile body 12 in the cross-sectional direction is increased. Therefore, the plugs 14 of the present embodiment are disposed at unequal angular intervals in the outer circumferential direction of the pile body 12. In the arrangement example of the pins 14 shown in fig. 1(c), two sets of the pins 14 are provided so as to face each other, and four pins 14 in total are arranged so as to be spaced from the adjacent pins 14 by 120 ° and 60 °.

By providing a plurality of such bolts 14 arranged at unequal intervals, the bolts 14 are provided at positions in the cross-sectional direction where it is desired to impart relatively high strength to the pile 12, whereby the strength of the two

pile

12, 12 after connection can be increased with a simple structure.

The positions of the plugs 14 are not limited to the unequal intervals, and may be arranged at equal angular intervals in the outer circumferential direction. According to this configuration, since the pile 12 and the joint 10 are fitted to each other without considering the position of the pile 12 where the pin 14 is provided, the pile 12 and the joint 10 can be easily fitted to each other.

Fig. 5 is a view showing the load transmission positions of the two

pile sections

12, 12 and the joint 10 when the two

pile sections

12, 12 are connected.

Fig. 5(a) shows a load transmission point when pile 12 is pressed in (pressed in pile 12 in downward direction y 2). Since a downward force is applied to pile body 12, ends 12B and 12B where the two

connected pile bodies

12 and 12 abut when pile body 12 is pushed in serve as load transmission sites, as indicated by arrow a.

Fig. 5(b) shows the load transmission site when the embedded pile 12 is extracted (the pile 12 is extracted in the upward direction y 1). Since an upward force is applied to the pile body 12, the tapered shape (wedge shape) of the fitting portion 22 and the plug 14 becomes a load transmission portion as indicated by an arrow B when the pile body 12 is pulled out.

Fig. 5 c shows a load transmission portion (torque transmission portion) when the pile 12 is rotated (the pile 12 is rotated in the right direction x). Since a force in the rightward rotation direction is applied to the pile body 12, the tapered distal end portion of the plug 14 and the fitting portion 22 serve as a load transmission portion when the pile body 12 is rotated, as indicated by arrow C.

Fig. 6 is a view showing a process of connecting two

pile bodies

12, 12 and burying them in a pile driver 30.

First, the pile driver 30 grips one of the pile bodies 12a with the collet 32 and buries it. Next, the pile driver 30 grips the other shaft 12b to be connected to the shaft 12a by the collet 32. Then, the bolt 14 of the shaft 12Bb is inserted into the insertion portion 20 of the joint 10 with the clamp 32 clamped, so that the joint 10 is fitted into the shaft 12b, and then the joint 10 is rotated to fit the bolt 14 into the fitting portion 22 (fig. 6 (a)). Next, the pile 12b fitted with the joint 10 is erected on the embedded pile 12a, and the other pile 12b is rotated to connect the two

piles

12a, 12b with the joint 10 (fig. 6 (c)). The term "standing up the pile 12b on the embedded pile 12 a" means that the pile 12a and the pile 12b are vertically arranged so that the axes thereof are aligned with each other.

It should be noted that the present invention is not limited to this, and the joint 10 may be fitted into the embedded pile body 12a (fig. 6(b)), the pile body 12b may be erected on the pile body 12a to which the joint 10 is fitted, and the other pile body 12b may be rotated to connect the two

pile bodies

12a and 12b by the joint 10 (fig. 6 (c)).

Fig. 7 to 10 are views showing a mode in which the reinforcing member 40 is provided in the joint 10.

In the joint 10, as shown in fig. 5, since the fitting portion 22 is a load transmission portion, the strength in the vicinity of the region where the fitting portion 22 is formed is relatively lower than that in other regions. Therefore, as shown in fig. 7, the body portion 16 of the present embodiment is provided with a reinforcing member 40 that covers at least the fitting portion 22. According to this structure, the strength reduced by the formation of the fitting portion 22 can be increased by the reinforcing member 40, and the joint 10 can be suppressed from being deformed during load transmission. The reinforcing member 40 of the present embodiment covers not only the fitting portion 22 but also the periphery of the insertion portion 20. The reinforcing member 40 is joined to the main body 16 by welding or the like.

The reinforcing member 40 of the present embodiment is formed with a hole 42, and the hole 42 is used to confirm insertion of the plug 14. An example of the hole 42A formed in the reinforcing member 40 is a hole 42B formed at a position (hole 42A) of the insertion portion 20 and a position (hole 42B) of the fitting portion 22. The hole 42A is circular. The hole 42B is a rectangle (rounded rectangle) having a long side in a direction intersecting the axial direction of the joint 10, and is formed so as to straddle the upper and lower fitting portions 22. As described above, by forming the hole 42 in the reinforcing member 40, even if the reinforcing member 40 is provided, the worker can visually confirm the insertion state of the plug 14 into the insertion portion 20 and the fitting portion 22.

Fig. 8 is a diagram showing a method of connecting the two

pile bodies

12, 12 and the joint 10 provided with the reinforcing member 40. Even if the reinforcing member 40 is provided, the method of connecting the pile 12 and the joint 10 is not changed, and the pile 12 is fitted into each end 16A of the body 16 of the joint 10 (fig. 8(a)) and the pile 12 is rotated, so that the plug 14 is fitted into and connected to the fitting portion 22 (fig. 8 (b)).

Further, if the rotation direction of the pile 12 is reversed when the pile 12 is pressed in, the pin 14 fitted into the fitting portion 22 of the joint 10 may be disengaged from the fitting portion 22. Therefore, as shown in fig. 9, the joint 10 of the present embodiment may be provided with a reverse stopper 50A corresponding to the stopper member of the present invention, and the reverse stopper 50A may prevent the plug 14 from being detached from the fitting portion 22. Fig. 9(a) is a view showing a use example of the reverse stopper 50A, which is a view of spreading the joint 10 and the reinforcing member 40 in the outer circumferential direction of the pile body 12. Fig. 9(b) is a front view, a plan view, and a side view of the inversion stopper 50A. Fig. 9(c) is a diagram showing the action of the pin 52 formed on the reverse stopper 50A.

As shown in fig. 9(a), after the

pile bodies

12 and 12 are connected by the joint 10, the reverse stopper 50A is inserted into the insertion portion 20. Therefore, the width of the reverse stopper 50A is formed to be slightly smaller than the width of the insertion portion 20 and to be shaped to follow the outer peripheral surface 12A of the pile body 12.

Further, in the reverse stopper 50A of the present embodiment, a pin 52 is formed so as to correspond to the hole 42A of the reinforcing member 40, and slits 54 are formed on the left and right of the pin 52. That is, the reverse stopper 50A pushes the pin 52 by a cantilever spring back when inserted into the insertion portion 20, so that the slit 54 and the area between the slits 54 are bent. And, when the reverse rotation stopper 50A is inserted until the pin 52 reaches the hole 42A, the pin 52 is caught in the hole 42A. This fixes the slit 54 in the insertion portion 20, and prevents the plug 14 from coming off the fitting portion 22, thereby reliably preventing the shaft 12 fitted in the joint 10 from coming off the joint 10.

Fig. 10 is a view showing a reverse stopper 50B according to another embodiment of the anti-slip member of the present invention. Fig. 10(a) is a view showing an example of use of the inversion stopper 50B, which is a view of spreading the joint 10 and the reinforcing member 40 in the outer circumferential direction of the pile body 12. Fig. 10(B) is a front view and a plan view of the reverse stopper 50B. The reverse stopper 50B has a hole 56 formed therein so as to correspond to the hole 42A of the reinforcing member 40, and the hole 56 is internally threaded. After the reverse stopper 50B is inserted into the insertion portion 20, a bolt is inserted through the hole 42A of the reinforcing member 40, and the bolt is screwed into the hole 56 of the reverse stopper 50B. Thereby, the reinforcing member 40 and the reverse stopper 50B are fastened by the bolt, and the reverse stopper 50B is fixed to the reinforcing member 40.

In the present embodiment, the embodiment has been described in which the single row of pins 14 is provided in the lateral direction of the pile body 12, but the present embodiment is not limited to this, and as shown in fig. 11, the multiple rows of pins 14 may be provided in the axial direction of the pile body 12. In the joint 10, a plurality of rows of fitting portions 22 are formed so as to correspond to the plurality of rows of pins 14.

In the present embodiment, the mode in which the joint 10 is independent from the pile body 12 has been described, but the present embodiment is not limited to this, and the joint 10 may be joined to one end of two pile bodies 12 as shown in fig. 12.

(second embodiment)

Fig. 13 is an external view of the pile body 12 and the joint 10 according to the present embodiment. In fig. 13, the same components as those in fig. 1 to 12 are denoted by the same reference numerals as those in fig. 1 to 12, and the description thereof will be omitted.

The fitting portion 22 formed in the joint 10 of the present embodiment is formed with a plurality of tapered shapes and a plurality of wedge shapes in the axial direction of the pile body 12. More specifically, one fitting portion 22 is constituted by a vertical portion 122A parallel to the axial direction of pile body 12 and a plurality of horizontal portions 122B orthogonal to vertical portion 122A. That is, each horizontal portion 122B is formed in a tapered shape or a wedge shape on the end portion 16A side of the joint 10.

In addition, the vertical portion 122A is formed in a tapered shape or a wedge shape extending from the end portion 16A of the joint 10 to form the horizontal portion 122B. The shape of the end portion 16A side of the joint 10 of the vertical portion 122A is not limited to this, and may be horizontal.

The plug 14 of the present embodiment is formed in a shape corresponding to the taper shape and wedge shape of the fitting portion 22 of the present embodiment. Therefore, the plug 14 is composed of a vertical portion 114A parallel to the axial direction of the pile body 12 and three horizontal portions 114B orthogonal to the vertical portion 114A.

In this way, in the joint 10 of the present embodiment, since a plurality of tapered shapes and wedge shapes are formed in one fitting portion 22, the pile body 12 after the connection can be firmly integrated. In addition, compared to the case where the pins 14 are provided in a plurality of rows as described with reference to fig. 11 of the first embodiment, positioning at the time of welding the pins 14 up and down is not necessary, and the number of working steps can be reduced. That is, in the structure shown in fig. 11, since the plurality of fitting portions 22 are provided in the vertical direction, a plurality of steps for preventing the displacement of the plug 14 by welding in the vertical direction are required although the two pile bodies 12 are more firmly connected. However, in the present embodiment, the pins 14 can be fitted to the plurality of fitting portions 22 by welding only one pin 14.

In the present embodiment, three horizontal portions 122B (tapered and wedge-shaped) are formed in one fitting portion 22 as an example, but the present invention is not limited to this, and two horizontal portions 122B may be formed in one fitting portion 22, or four or more horizontal portions 122B may be formed in one fitting portion 22. In the plug 14 of the present embodiment, the horizontal portions 114B are formed in the number corresponding to the shape of the fitting portion 22.

(third embodiment)

In the present embodiment, one of the two pile sections 12 connected by the joint 10 is a pile section 12 buried underground, and the other pile section 12 is a pile section (hereinafter referred to as "simple pile driving device") 60 for assisting in burying one of the pile sections 12 (see fig. 14). Although the simple pile driving device 60 is disposed above the pile body 12 buried underground, the simple pile driving device 60 itself is not buried underground.

In the simple pile driving device 60, a circular pipe having the same outer shape as the pile body 12 is used as the body 60A, and the joint 10 is provided at least at one end of the body 60A. The fitting portion 22 of the joint 10 is formed along the circumferential direction of the body portion 60A. The body 60A may have a length longer than the length of the pile body 12 buried under the ground and may be held by a collet 32 of a pile driver 30 described later.

Fig. 14 is a view showing a process of connecting the simple pile driving device 60 and the pile body 12 and burying the pile body 12 with the pile driver 30. In fig. 14, the same components as those in fig. 1 to 13 are denoted by the same reference numerals as those in fig. 1 to 13, and the description thereof will be omitted.

The shape of the fitting portion 22 shown in fig. 14 is the same as the shape of the fitting portion 22 shown in fig. 13, but this is merely an example, and may be the same as the shape of the other fitting portion 22 shown in fig. 1 or 11. In the following description, the pile body 12 buried underground using the simple pile driving device 60 is referred to as a lower pile 12c, and the pile body 12 connected to the lower pile 12c is referred to as an upper pile 12 d.

Fig. 14(a) shows the following state: the lower pile 12c and the simple pile driving device 60 are connected by the joint 10, and the pile driver 30 holds the region including the joint 10. The lower pile 12c is connected to the simple pile driving device 60 by the joint 10, and then clamped by the clamp 32.

Fig. 15 is a schematic side view of a claw (hereinafter referred to as a "stepped claw") 70 provided in the collet 32 provided in the pile driver 30. The collet 32 is rotated while holding the pile body 12 by pressing the pile body 12 from the outer circumferential side by a plurality of stepped claws 70 provided on the inner circumference.

The stepped claw 70 has a stepped shape 74 formed on a pressing portion 72 that presses the pile body 12. The vertical length y of the stepped shape 74 is formed to be equal to or slightly greater than the vertical length of the joint 10 of the simple piling device 60. Further, the horizontal depth x of the stepped shape 74 is formed to be equal to or slightly greater than the thickness of the joint 10. As described above, when the shaft 12 and the like connected by the joint 10 are held by the collet 32 at the pressing portion 72, a step is formed by fitting the joint 10. In the step claw 70, the lower side of the step shape 74 abuts on the lower pile 12c, and the upper side of the step shape 74 abuts on the body portion 60A of the simple pile driver 60.

That is, the stepped claw 70 can grip the pile body 12 without interfering with the portion of the joint 10 protruding from the outer peripheral portion of the pile body 12, and can grip the pile body 12 over a wide range.

Fig. 14(b) shows a state where the lower pile 12c is connected to the simple pile driver 60 and the lower pile 12c is embedded by the pile driver 30. As shown in fig. 14(b), when the lower pile 12c is embedded, the collet 32 grips the body 60A of the simple pile driving device 60.

Then, the simple piling device 60 is removed from the lower pile 12 c. Then, the upper pile 12d is connected to the embedded lower pile 12 c. The end 12B of the upper pile 12d of the present embodiment is joined to the joint 10, and the lower pile 12c and the upper pile 12d are connected by the joint 10.

Fig. 14(c) shows a state where the lower pile 12c is further embedded in the upper pile 12d by the pile driver 30 while connecting the lower pile 12c to the upper pile 12 d. As shown in fig. 14(c), the pile press machine 30 embeds the lower pile 12c and the upper pile 12d in the ground while holding the upper pile 12d with the clip 32.

In the method of burying the lower pile 12c using such a simple piling device 60, the pile body 12 can be buried without using a suspension device. For example, when the lower pile 12c and the upper pile 12d are connected by the joint 10 and buried in the ground, the total length thereof increases, and thus it is necessary to suspend the connected lower pile 12c and upper pile 12d by using a suspension device. However, by using the simple pile driving device 60 capable of connecting the lower pile 12c by the joint 10, the pile driver 30 can easily bury the pile body 12 in the ground without using a suspension device.

In the present embodiment, the embodiment in which the simple pile driving device 60 includes the joint 10 has been described, but the present invention is not limited to this, and the simple pile driving device 60 may include the plug 14 on the outer periphery of the simple pile driving device 60 instead of the joint 10. That is, the simple pile driving device 60 and the lower pile 12c may be connected by the separate joint 10. In this embodiment, a pin 14 is provided on the outer periphery of the upper pile 12d connected to the lower pile 12c, and the lower pile 12c and the upper pile 12d are connected by the separate joint 10.

Instead of using the simple pile driving device 60, the pile body 12 (upper pile 12d) to which the joint 10 is joined in advance may be connected to the lower pile 12c, and the lower pile 12c and the upper pile 12d may be embedded by using the pile driver 30 having the step claw 70 in the collet 32.

(fourth embodiment)

As shown in fig. 16, the pile driver 30 of the present embodiment includes a main collet 32A and a sub-collet 32B as the collet 32 for gripping the pile body 12. Fig. 16 is a diagram showing a process of embedding the pile body 12 using the pile driver 30 according to the present embodiment. In the present embodiment, the joint 10 is joined to the upper pile 12d in advance, and the pin 14 fitted to the joint 10 is joined to the lower pile 12 c.

The main collet 32A and the sub-collet 32B are both capable of detachably gripping the shaft 12. The main chuck 32A is supported on a mast (マスト)33 to be relatively movable up and down. The sub chuck 32B is attached to a position deviated downward from the moving range of the main chuck 32A.

As shown in fig. 16(a), the sub-collet 32B is fixed to a lower end of a guide 33B extending downward from the front ends of a pair of mast arms 33A provided on the mast 33, and projects forward of the pile driver 30 from the lower end. The sub-cartridge 32B is disposed at a position spaced below the main cartridge 32A and coaxial with the main cartridge 32A. With such a configuration, in the pile press 30 of the present embodiment, the main collet 32A moves in the vertical direction while holding the pile body 12, but the sub-collet 32B does not move in the vertical direction.

Fig. 17 is a schematic configuration diagram of a sub collet 32B provided in the pile driver 30 according to the present embodiment.

As shown in fig. 17, in the sub collet 32B, the plurality of holding portions 82 are fixed to the sub collet 32B so as to extend along the inner periphery of the insertion hole 80 into which the pile body 12 is inserted into the sub collet 32B, and grip the pile body 12 from the outer periphery side at a position below the main collet 32A. In one example of the sub clip 32B, a plurality of holding portions 82 that can be elongated in the center direction of the insertion hole 80 are provided on the inner periphery of the sub clip frame 83. The plurality of holding portions 82 (four in the example of fig. 17) are provided in the circumferential direction of the insertion hole 80, and press and hold the pile body 12 from the outer circumferential side. With this structure, the holding portion 82 can grip the pile body 12 regardless of the outer diameter of the pile body 12.

The structure of the sub-clip 32B shown in fig. 17 is an example, and may be other structures as long as it can clamp the pile body 12. For example, the sub clip 32B may also include: an arcuate annular band divided into a plurality of (e.g., three) circumferential segments; and a chuck hydraulic cylinder for joining ends of the endless belts adjacent in the circumferential direction to each other and moving each endless belt in the radial direction. In this structure, three circumferential bands arranged in the circumferential direction are formed annularly, the shaft 12 is inserted into the inner circumferential side thereof, and the circumferential bands are moved in the radial direction to hold the shaft 12.

However, when the lower pile 12c partially buried in the ground is connected to the upper pile 12d via the joint 10 by using the pile press machine 30, it is necessary to apply a supporting force and a peripheral frictional resistance of a predetermined value or more to the lower pile 12 c. If sufficient supporting force is not applied to the lower pile 12c, even if the upper pile 12d held by the pile driver 30 is moved downward and the plug 14 is inserted into the insertion portion 20 of the joint 10, the lower pile 12c is lowered as the upper pile 12d moves downward and cannot be connected. Further, if sufficient peripheral frictional resistance does not act on the lower pile 12c, even if the upper pile 12d is rotated and the pin 14 of the lower pile 12c is fitted into the fitting portion 22 of the joint 10, the lower pile 12c rotates with the rotation of the upper pile 12d and cannot be connected.

Further, if the lower pile 12c is not subjected to a supporting force or a peripheral frictional resistance of a predetermined value or more, even if the lower pile 12c and the upper pile 12d are connected to each other by the joint 10 at first glance, the connection is not reliable, and the connection may be broken during the course of pushing into the ground or the bending strength that would otherwise be generated by the connection by the joint 10 may not be generated.

Therefore, in the embedding method of the present embodiment, the lower pile 12c is clamped by the sub-clamp 32B, and the lower pile 12c and the upper pile 12d are connected by the pile driver 30 via the joint 10.

The embedding method according to the present embodiment will be described below with reference to fig. 16. Note that the direction of the arrow in fig. 16 indicates the direction of the force acting on the pile body 12.

Fig. 16(a) shows a state where the lower pile is held by the sub-collet 32B and the upper pile is held by the main collet 32A. The main clip 32A of the present embodiment includes the stepped claw 70 as described in the third embodiment, but the stepped claw 70 may not be used when the main clip 32A does not clamp the fastener 10.

Fig. 16(b) shows a state where the bolt 14 of the lower pile 12c is inserted into the joint 10 of the upper pile 12d by moving the main collet 32A downward. Fig. 16(c) shows a state where the upper pile 12d is rotated and the pin of the lower pile 12c is fitted to the joint 10 of the upper pile 12 d. In fig. 16(B) and 16(c), since the sub-clip 32B clamps the lower pile 12c with sufficient force, a load and a torque required for connecting the lower pile 12c and the upper pile 12d via the joint 10 are applied, and the plug 14 and the joint 10 can be reliably fitted.

Fig. 16(d) shows a state in which the lower pile 12c is further embedded (pressed) into the upper pile 12d by the pile driver 30 while connecting the lower pile 12c to the upper pile 12 d. The pile press-fitting machine 30 presses the lower pile 12c and the upper pile 12d connected by the joint 10 into each other by moving the main collet 32A downward. At this time, the sub-clip 32B does not clip the lower pile 12c, that is, does not apply force to the lower pile 12 c.

As described above, the burying method of the present embodiment is such that the upper pile 12d and the buried lower pile 12c are connected by the joint 10 by lowering and rotating the main collet 32A while the upper pile 12d is gripped by the main collet 32A and the lower pile 12c is gripped by the sub-collet 32B. Thus, the embedding method according to the present embodiment can more reliably connect the two pile bodies 12.

In the present embodiment, the embodiment has been described in which the upper pile 12d includes the joint 10, but the present invention is not limited to this, and the upper pile 12d may include the pin 14 on the outer periphery of the upper pile 12d instead of the joint 10. That is, the upper pile 12d and the lower pile 12c may be connected by separate joints 10.

In the present embodiment, the first step of clamping the lower pile 12c by the sub-collet 32B provided in the pile press 30, the second step of clamping the upper pile 12d by the main collet 32A provided in the pile press 30, and the third step of connecting the upper pile 12d and the lower pile 12c by the joint 10 by moving the main collet 32A so that the upper pile 12d abuts on the

ends

12B and 12B of the lower pile 12c and rotating the main collet 32A or the sub-collet 32B may be performed, or the upper pile 12d and the lower pile 12c may be connected by the joint 10 before the lower pile 12c is buried in the ground.

Fig. 18 is a structural view of the reinforcing member 40 and the reverse stopper 50C according to the present embodiment. Fig. 18(a) is an external view (showing the fastener 10 and the reinforcing member 40 being spread in the outer circumferential direction of the pile body 12), fig. 18(b) is an a-arrow view of fig. 18(a), and fig. 18(C) is a side view showing the plug 14 fitted to the fitting portion 22 beyond the reverse stopper 50C.

After the two pile bodies 12 are connected by the joint 10 provided with the reinforcing member 40, the

reverse stoppers

50A and 50B described with reference to fig. 9 and 10 of the first embodiment are inserted into the insertion portion 20 of the joint 10.

On the other hand, as shown in fig. 18(b), the reverse stopper 50C of the present embodiment is joined to the inner circumferential surface (surface in contact with the pile body 12C) of the reinforcing member 40 in advance. The reverse stopper 50C is engaged with the engaging portion 22 of the engaging piece 10. That is, as shown in fig. 18C, the plug 14 inserted into the insertion portion 20 is fitted into the fitting portion 22 beyond the reverse stopper 50C, and is prevented from being detached from the fitting portion 22 by the reverse stopper 50C (hereinafter, also referred to as "locking").

One example of the reverse stopper 50C of the present embodiment is a plate-like shape, and a tapered slope 90A is formed on a surface opposite to the fitting portion 22 side so that the plug 14 can pass over the reverse stopper 50C and be fitted to the joint 10. On the other hand, the surface of the inversion stopper 50C on the fitting portion 22 side is formed as an orthogonal surface 90B orthogonal to the inner peripheral surface of the reinforcing member 40 so that the plug 14 is not detached from the fitting portion 22. Further, the tapered inclined surface 14A is also formed on the surface of the plug 14 that abuts against the inclined surface 90A of the reverse stopper 50C, so that the plug 14 easily passes over the reverse stopper 50C.

The reverse stopper 50C is not necessarily provided for each fitting portion 22, and may be engaged with at least one of the plurality of fitting portions 22 formed in the joint 10. In the example of fig. 18, two reverse stoppers 50C are joined to the four fitting portions 22.

According to the reverse stopper 50C, the plug 14 fitted to the joint 10 can be prevented from being detached with a simple structure. More specifically, the structure according to the present embodiment is simpler than the structures shown in fig. 9 and 10, and therefore, the cost is low. Further, according to the structure of the present embodiment, since the bolt 14 is locked by the joint 10 by the step of fitting the bolt 14 into the joint 10 by rotating the pile body 12, a separate operation step for locking the bolt 14 is not required.

The present invention has been described above with reference to the above embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements may be made to the above-described embodiments without departing from the scope of the invention, and the embodiments to which changes or improvements are made are also included in the technical scope of the invention.

In the above embodiment, the embodiment in which the fitting portion 22 is formed in the tapered shape and the tapered shape has been described, but the present invention is not limited to this, and only the tapered shape may be formed in the fitting portion 22, or only the tapered shape may be formed in the fitting portion 22. That is, the fitting portion 22 may be formed in at least a tapered shape or a wedge shape.

In the above embodiment, the embodiment has been described in which the body portion 16 of the joint 10 covers the outer peripheral surface 12A of the shaft 12, but the present invention is not limited to this, and the body portion 16 of the joint 10 may be formed along the inner peripheral surface of the shaft 12. In this embodiment, the plug 14 is provided on the inner circumferential surface of the pile body 12.

Description of the symbols:

10 joints (shaft joints);

12, pile body;

14 pins (projections);

16a main body portion;

22a fitting part;

40 a reinforcing member;

a 50A reverse stopper (anti-slip member);

a 50B reverse stopper (anti-drop member);

50C reverse stopper (anti-slip member).

Claims

1. A pile body joint for connecting two pile bodies, comprising:

a tubular main body into which the shaft having the projection on the circumferential surface thereof is fitted from the end; and

a fitting portion formed in the main body so as to be fitted to the protruding portion by fitting and rotating the pile body;

the fitting portion is formed with a first shape having a surface inclined so as to be apart from the end portion of the main body in a rotation direction of the pile body, or with a second shape fitted between the protruding portion and the pile body.

2. The shaft joint of claim 1,

the fitting portion has the second shape formed on the surface on which the first shape is formed.

3. The shaft joint according to claim 1 or 2,

the protruding part is planar and the inner side of the plane is hollowed out.

4. The shaft joint according to any one of claims 1 to 3,

the pile body is provided with a plurality of the projections arranged at unequal angular intervals in the circumferential direction,

the main body portion is formed with a plurality of the fitting portions corresponding to the plurality of the protruding portions.

5. The shaft joint according to any one of claims 1 to 4,

the main body portion is provided with a reinforcing member that covers at least the fitting portion.

6. The shaft joint of claim 5,

the fitting portion is provided with a protrusion portion for engaging with the fitting portion.

7. The shaft joint according to claim 5 or 6,

the reinforcing member is formed with a hole for confirming insertion of the protruding portion into the fitting portion.

8. The shaft joint according to any one of claims 1 to 7,

the fitting portion has a plurality of the first shapes or a plurality of the second shapes formed in an axial direction of the pile body.

9. The shaft joint according to any one of claims 1 to 8,

one of the two pile bodies is the pile body buried underground,

the other pile body is used for assisting in embedding the one pile body and is arranged above the one pile body.

10. A pile body connecting structure, comprising:

a pile body having a projection on a circumferential surface thereof; and

and a shaft joint having a tubular body into which the shaft is fitted from an end, wherein a fitting portion into which the shaft is fitted and rotated is formed with a first shape having a surface inclined so as to be away from the end of the body in a rotation direction of the shaft or a second shape fitted between the protrusion and the shaft.

11. A pile body connecting method for connecting two pile bodies by a pile body joint, the pile body joint having a tubular main body into which a pile body having a projection on a peripheral surface thereof is fitted from an end portion, wherein a fitting portion into which the projection is fitted by fitting and rotating the pile body is formed with a first shape having a surface inclined so as to be away from the end portion of the main body in a rotating direction of the pile body or with a second shape fitted between the projection and the pile body,

the pile body connecting method comprises the following steps:

a first step of burying the pile body; and

and a second step of erecting the other pile body on the embedded pile body and rotating the other pile body to fit the two pile bodies together with the pile body joint.

12. A pile body connecting method for connecting a first pile body and a second pile body by a pile body joint, the pile body joint having a tubular body into which a pile body having a projection on a circumferential surface thereof is fitted from an end portion, and having a first shape or a second shape formed in a fitting portion that is fitted into the projection by fitting and rotating the pile body, the first shape having a surface inclined so as to be away from the end portion of the body in a rotation direction of the pile body, the second shape being fitted between the projection and the pile body,

the pile body connecting method comprises the following steps:

a first step of clamping the second pile body by a second clamping mechanism provided in the pile press;

a second step of clamping the first pile body by a first clamping mechanism provided in the pile press; and

a third step of moving the first clamping mechanism so that the first pile body abuts against an end of the second pile body, and rotating the first clamping mechanism or the second clamping mechanism to connect the first pile body and the second pile body by the pile body joint.