KR20230140669A - Connection structure of steel piles - Google Patents

Abstract

The present invention relates to a steel pile connection structure which equally divides ends of an upper and a lower steel pipe in a sawtoothed shape corresponding to each other to have a sliding surface, a stopping part, and a stopping groove, inserts the stopping part into the stopping groove without a separate coupler to engage the upper and lower pipes to simply connect the upper and lower pipes, is easily machined to provide economic efficiency, and has excellent constructability. The steel pile connection structure is to directly fasten the upper end of a lower steel pipe and the lower end of an upper steel pipe to be joined to each other. The upper end of the lower steel pipe is equally divided into at least two parts of the same angle, and first sliding surfaces inclined in the same direction are formed on the upper ends to be formed in a sawtoothed shape. A first stopping part extended from the first sliding surface protrudes from an upper portion of a side of a stepped part of an end of the first sliding surface, and a first stopping groove extended from the first sliding surface adjacent to the lower surface is formed on a lower portion of the first stopping part. The lower end of the upper steel pipe is equally divided in the same manner as the lower steel pipe, and second sliding surfaces of angles corresponding to the first sliding surfaces are formed on the lower ends to be formed in a sawtoothed shape corresponding to the lower steel pipe. A second stopping part inserted into the first stopping groove protrudes from a lower portion of a side of a stepped part of an end of the second sliding surface, and a second stopping groove allowing the first stopping part to be inserted thereinto is formed on an upper portion of the second stopping part.

Description

Connection structure of steel piles}

In the present invention, the ends of the upper and lower steel pipes are equally divided into corresponding sawtooth shapes and are provided with a sliding surface, a locking piece, and a locking groove. The locking piece can be inserted into the locking groove without a separate coupler to simply engage the upper and lower steel pipes. It is about a steel pipe pile connection structure that can be connected, is economical due to easy processing, and has excellent constructability.

A helical pile is a steel pipe pile with a spiral helix attached to the outside of the pile shaft, which is a small diameter steel pipe with a diameter of about 50 to 120 mm, and is constructed by penetrating into the ground by rotation.

Helical piles exert bearing force by the tip bearing force developed from the helix and the main surface friction force developed by the cylindrical ground located between the large-diameter helices. As a result, it can demonstrate higher bearing capacity compared to steel pipe piles of the same standard.

In addition, unlike the driving method or the method of pre-excavating a drill hole and then inserting the pile, helical piles are constructed without topping by rotary penetration, so ground disturbance is minimal and construction speed is fast. For this reason, it is often used to reinforce the foundation of remodeling construction or support structures for solar power facilities.

In general, helical piles are constructed by rotary penetration by equipping hydraulic devices on small-scale equipment such as backhoes. Therefore, the pile length is limited to less than 3m, and multiple piles are connected and used depending on the penetration depth.

Accordingly, helical piles use various pile joints to connect the piles.

Among these, the pin-type joint uses a connecting steel pipe with a pinhole, and connects the upper and lower steel pipes by fastening pins.

Pin-type joints are widely used because they are simple to construct and low cost.

However, a separate connecting steel pipe is required, and the pinhole and pin mutually resist the torque generated during rotational penetration, but there are structural vulnerabilities such as damage to the pinhole due to the gap between the pinhole and the pin.

Next, in the thread type joint, connecting steel pipes with female and male threads machined separately are welded to both sides of a steel pipe pile, then rotated and joined by screw coupling.

However, thread-type joints have the problem of increasing costs due to the high cost of thread processing. In addition, when separating the penetration equipment and the pile or reversing the pile to pull out the pile, the joint joint between the piles may be released.

In addition, the coupling type joint combines a female coupling with a L-shaped locking protrusion formed on the upper inner peripheral surface of the lower shaft pile, and forms an L-shaped male coupling on the lower outer peripheral surface of the upper shaft pile to connect the female coupling and the male coupling. The files are joined by joining (Public Patent No. 10-2019-0000532, etc.).

However, coupling type joints are uneconomical due to the high processing cost of the male and female couplings.

In order to solve the above problems, the present invention seeks to provide a steel pipe pile connection structure that can directly connect the upper and lower steel pipe piles without the need for a separate coupler, is economical due to easy processing, and has excellent constructability.

The present invention according to a preferred embodiment relates to a steel pipe pile connection structure for mutually joining the upper end of the lower steel pipe, each of which has a circular cross-section, by directly fastening the lower end of the upper steel pipe, and the upper end of the lower steel pipe is divided into at least two equal angles. A first sliding surface inclined in the same direction is formed at the top of each, forming a sawtooth shape, and a first locking piece extending from the first sliding surface protrudes from the upper part of the side end of the step at the end of the first sliding surface. A first locking groove extending from the first sliding surface adjacent to the lower surface is formed in the lower part of the first locking piece, the lower end of the upper steel pipe is divided into equal parts as the lower steel pipe, and each lower end has the first locking groove. A second sliding surface is formed at an angle corresponding to the first sliding surface and is formed in a sawtooth shape corresponding to the lower steel pipe, and a second sliding surface is inserted into the first locking groove at the lower part of the side end of the step portion at the end of the second sliding surface. A steel pipe pile connection structure is provided, wherein a locking piece is formed to protrude, and a second locking groove into which the first locking piece is inserted is formed on an upper part of the second locking piece.

The present invention according to another preferred embodiment is characterized in that key grooves are formed at corresponding positions on the joint surfaces of the lower steel pipe and the upper steel pipe, a key hole is formed by the upper and lower key grooves, and a shear key is inserted into the key hole. Provides a steel pipe pile connection structure.

The present invention according to another preferred embodiment provides a steel pipe pile connection structure, wherein the upper end of the lower steel pipe and the lower end of the upper steel pipe are divided into three or more equal parts.

The present invention according to another preferred embodiment is a steel pipe pile connection, wherein the keyholes are formed as a pair at symmetrical positions on both sides of the lower steel pipe and the upper steel pipe, and the shear key is fastened through the pair of keyholes. Provides structure.

The present invention according to another preferred embodiment is a steel pipe pile, characterized in that, on the outside of the joint between the lower steel pipe and the upper steel pipe at the keyhole location, a guide plate is formed in a planar arc shape to be in close contact with the outer peripheral surface of the steel pipe and the shear key penetrates. Provides a connection structure.

The present invention according to another preferred embodiment provides a steel pipe pile connection structure, wherein a fixing nut to which a shear key is fastened to the keyway position is provided on the inner peripheral surface of either the lower steel pipe or the upper steel pipe.

According to the present invention, the ends of the upper and lower steel pipes, which are circular steel pipes, are equally divided into corresponding sawtooth shapes and are provided with a sliding surface, a locking piece, and a locking groove, and the upper and lower steel pipes are simply engaged with each other by inserting the locking piece into the locking groove. A steel pipe pile connection structure that can be easily connected can be provided.

Accordingly, the connection is completed by rotating the upper steel pipe along the sliding surface with the upper and lower steel pipes in close contact, inserting and fixing the locking piece inside the locking groove, and thus the upper and lower steel pipe piles can be simply connected without a separate coupler, resulting in excellent constructability. do.

In addition, steel pipes of a single standard can be used as the upper and lower steel pipes, and the sliding surface, locking piece, and locking groove can be precisely processed by CNC cutting, making it easy and economical to manufacture.

1 to 4 are diagrams showing a process of joining upper and lower steel pipes according to an embodiment.
Figure 5 is a perspective view showing the combined state of the upper and lower steel pipes.
6 to 9 are diagrams showing a process of joining upper and lower steel pipes according to another embodiment.
Figure 10 is a perspective view showing the joined state of the upper and lower steel pipes in which the stopping piece is formed with a chamfer.
Figure 11 is a perspective view showing the coupling relationship of the through-type shear key.
Figure 12 is a perspective view showing the coupling relationship of the guide plate.
Figure 13 is a perspective view showing the coupled state of the guide plate.
Figure 14 is a perspective view showing an embodiment provided with a fixing nut.

Hereinafter, the present invention will be described in detail according to the accompanying drawings and preferred embodiments.

Figures 1 to 4 are diagrams showing the joining process of the upper and lower steel pipes according to an embodiment, and Figure 5 is a perspective view showing the joining state of the upper and lower steel pipes.

As shown in Figures 1 to 5, the steel pipe pile connection structure of the present invention is a steel pipe pile connection structure for mutually joining the upper end of the lower steel pipe (1), each of which has a circular cross section, and the lower end of the upper steel pipe (2). Related to this, the upper end of the lower steel pipe 1 is equally divided into at least two equal angles, and at each upper end, a first sliding surface 11 inclined in the same direction is formed in a sawtooth shape, and the first sliding surface 11 is formed in a sawtooth shape. A first locking piece 12 extending from the first sliding surface 11 is formed protruding on the upper side of the stepped portion at the end of the sliding surface 11, and the lower surface is adjacent to the lower part of the first locking piece 12. A first locking groove 13 extending from the first sliding surface 11 is formed, and the lower end of the upper steel pipe 2 is divided equally into the lower steel pipe 1, and the first sliding groove is located at each lower end. A second sliding surface 21 is formed at an angle corresponding to the surface 11 and is formed in a sawtooth shape corresponding to the lower steel pipe 1, and is located at the bottom of the side end of the stepped portion at the end of the second sliding surface 21. A second locking piece 22 inserted into the first locking groove 13 is formed to protrude, and a second locking groove into which the first locking piece 12 is inserted is formed on the upper part of the second locking piece 22 ( 23) is characterized in that it is formed.

The present invention is intended to provide a steel pipe pile connection structure that can directly connect upper and lower steel pipe piles without the need for a separate coupler, is economical due to easy processing, and has excellent constructability.

The present invention is for combining helical piles, but is applicable not only to helical piles but also to other types of steel pipe piles using circular cross-section steel pipes.

The lower steel pipe (1) and the upper steel pipe (2), which are joined to each other, have joint ends of the same shape and can be used as a single standard without distinction between top and bottom.

The upper end of the lower steel pipe 1 and the lower end of the upper steel pipe 2 are each formed in a corresponding sawtooth shape, and are configured to engage with each other and transmit torque when rotating.

Specifically, the upper end of the lower steel pipe 1 is equally divided into at least two equal angles, and a first sliding surface 11 inclined to one side is formed on the upper surface of each divided end.

The upper steel pipe (2) is also divided into two or more equal parts at its lower end like the lower steel pipe (1), and a second sliding surface (21) inclined to one side is formed on the lower surface of each divided end.

Accordingly, when the upper steel pipe (2) is lowered while the lower steel pipe (1) is embedded in the ground (Figure 1), and the lower end of the upper steel pipe (2) is brought into close contact with the upper end of the lower steel pipe (1), the first sliding surface ( 11) and the second sliding surface 21 come into contact with each other (Figure 2).

And when the upper steel pipe (2) is rotated downward (FIG. 2), the second sliding surface (21) slides along the first sliding surface (11) and the end step of the second sliding surface (21) slides along the first sliding surface (11). It is caught on the end step of (11) and the rotational force of the upper steel pipe (2) is transmitted to the lower steel pipe (1) (FIG. 3).

At this time, a first locking piece 12 is formed on the upper side of the step portion of the first sliding surface 11 of the lower steel pipe 1, and accordingly, a first locking groove 13 is formed on the lower part of the first locking piece 12. ) is formed.

The upper surface of the first engaging piece 12 is formed as an inclined surface continuous with the first sliding surface 11, and the first engaging groove 13 is also formed as an inclined surface continuous with the adjacent first sliding surface 11. is formed

The first locking piece 12 and the first locking groove 13 can be formed by cutting the end of the lower steel pipe 1 rather than combining separate members.

The upper steel pipe (2) is formed with a second sliding surface (21), a second locking piece (22), and a second locking groove (23) in the same manner as the lower steel pipe (1).

The second locking piece 22 of the upper steel pipe 2 slides along the first sliding surface 11 of the lower steel pipe 1 and is inserted and coupled into the first locking groove 13 (FIG. 3). Accordingly, the first locking piece 12 of the lower steel pipe 1 is inserted into the second locking groove 23 of the upper steel pipe 2.

As a result, the second locking piece 22 and the first locking piece 12 can be caught by each other to resist pulling out.

That is, the upper end of the lower steel pipe 1 is formed in an L shape, and the lower end of the upper steel pipe 2 is formed in an L shape, and the upper and lower steel pipes 1 and 2 are connected by engaging the ends so as to engage each other.

Accordingly, the compressive force is transmitted by the acupressure of the first sliding surface 11 and the second sliding surface 21, and the pulling force is transmitted by the acupressure between the first engaging piece 12 and the second engaging piece 22 and each engaging piece ( 12, 22) is transmitted by shear force. In addition, torque is transmitted by acupressure between the side end of the first locking piece (12) and the inner surface of the second locking groove (23) and by acupressure between the side end of the second locking piece (22) and the inner surface of the first locking groove (13). .

The first locking piece 12 and the second locking groove 23 are formed to have the same shape and size and are fitted together. Likewise, the first locking groove 13 and the second locking piece 22 are formed to have the same shape and size and are fitted together.

In order to manufacture the lower steel pipe (1) and the upper steel pipe (2) to the same standard, the first locking piece (12), the second locking piece (22), the first locking groove (13), and the second locking groove are used. (23) is preferably configured to have the same height so that they all correspond.

The sliding surfaces 11 and 21, the locking pieces 12 and 22, and the locking grooves 13 and 23 can be precisely processed by laser cutting or CNC (computer numerical control) cutting. Therefore, it can be manufactured by cutting without separate connectors or welding, making it easy to manufacture and economical.

As shown in Figures 3 and 4, key grooves 14 and 24 are formed at corresponding positions on the joint surfaces of the lower steel pipe 1 and the upper steel pipe 2, respectively, so that the upper and lower key grooves 14 and 24 A key hole (H) is formed, and a shear key (3) can be inserted into the key hole (H).

After rotating the upper steel pipe (2) and inserting the locking pieces (22, 12) into the locking grooves (13, 23), the shear key (3) can be installed by inserting it into the key hole (H) as shown in Figures 4 and 5. You can.

The first sliding surface 11 and the second sliding surface 21 are formed to be inclined in one direction. Therefore, when rotating in the forward direction (downward inclined direction of the first sliding surface 11 and the second sliding surface 21), the side ends of the first locking piece 12 and the second locking piece 22 each have a second locking groove ( 23) and the inner surface of the first locking groove 13 to transmit rotational force, and are fixed so as not to separate from each other.

However, when rotating in the reverse direction (in the upwardly inclined direction of the first sliding surface 11 and the second sliding surface 21), the first locking piece 12 and the second locking piece 22 are connected to the second locking groove 23. As they fall out of the first locking groove (13), the coupling is released and they are separated from each other.

Therefore, the shear key (3) can be installed so that the locking pieces (12, 22) and the locking grooves (13, 23) do not come off and remain fixed even when rotating in the reverse direction.

For this purpose, the lower steel pipe 1 and the upper steel pipe 2 may form key grooves 14 and 24, respectively, at corresponding positions on the joint surfaces. A key hole (H) is formed by the upper and lower keyways (14, 24), and a shear key (3) is inserted into the key hole (H) to limit the rotational sliding movement of the lower steel pipe (1) and the upper steel pipe (2). You can.

The keyhole (H) may be formed in a circular or polygonal shape.

4 and the like show an embodiment in which the keyhole (H) is square.

When the keyhole (H) is circular, semicircular keyways (14, 24) may be formed on the joint surfaces of the lower steel pipe (1) and the upper steel pipe (2), respectively, and the upper and lower keyways (14, 24) may form an overall A keyhole (H) of circular shape is formed.

The key grooves (14, 24) are located at corresponding positions on the first sliding surface (11) and the second sliding surface (21), or on the lower surface of the first locking piece (12) and the upper surface of the second locking piece (22). It can be formed in a location where

It is preferable that a plurality of keyholes (H) and shear keys (3) are provided spaced apart at regular intervals so that they are evenly fixed around the circumference of the steel pipe.

A head portion 31 is formed at the rear end of the shear key 3, which hangs on the outer peripheral surface of the steel pipe, to prevent the shear key 3 from passing through the key hole H and falling into the steel pipe.

Figures 6 to 9 are diagrams showing a process of joining upper and lower steel pipes according to another embodiment, and Figure 10 is a perspective view showing a joined state of upper and lower steel pipes in which the engaging pieces are chamfered.

As shown in FIG. 6, the upper end of the lower steel pipe 1 and the lower end of the upper steel pipe 2 may be divided into three or more equal parts.

When the ends of the upper and lower steel pipes 1 and 2 are divided into two, locking pieces 12 and 22 and locking grooves 13 and 23 on both sides are formed at positions symmetrical to each other about the origin.

In this case, since the mating surfaces of both locking pieces (12, 22) and locking grooves (23, 13) are located parallel to each other, the out-of-plane direction (locking piece ( When a lateral force is applied in the normal direction of 12, 22), the locking pieces 12, 22 may deviate laterally from the locking grooves 23, 13.

Therefore, by dividing the upper end of the lower steel pipe (1) and the lower end of the upper steel pipe (2) into at least three equal parts, the angles of the engaging surfaces of the locking pieces (12, 22) and the locking grooves (23, 13) at each divided position are parallel. It can be formed so that it is misaligned without doing so.

Accordingly, no matter which direction the lateral force acts, the locking pieces (12, 22) and the locking grooves (23, 13) on at least one side are aligned with the side ends of the locking pieces (12, 22) and the inner surfaces of the locking grooves (23, 13). Since the coupling angle is offset from the direction of the lateral force, they do not break away from each other and remain fixed.

Even when the ends of the upper and lower steel pipes (1, 2) are divided into three, the upper steel pipe (2) is lowered from the upper part of the lower steel pipe (1) (FIG. 6), and the ends of the upper and lower steel pipes (1, 2) are brought into close contact (FIG. 7) ).

Then, rotate the upper steel pipe (2) to insert the locking pieces (12, 22) into the locking grooves (23, 13) (FIG. 8), and then insert the shear key into the keyhole (H) formed by the upper and lower keyways (14, 24). Construction can be done in the order of inserting and fixing (3) (Figure 9).

As shown in FIG. 10, the lower edge of the side end of the first locking piece 12 and the second locking piece allow the locking pieces 12 and 22 to easily enter and be inserted into the entrances of the other locking grooves 23 and 13. The upper edge of the side end of the piece 22 may be chamfered (121, 221).

Figure 11 is a perspective view showing the coupling relationship of the through-type shear key.

As shown in Figure 11, the keyholes (H) are formed in a pair at symmetrical positions on both sides of the lower steel pipe (1) and the upper steel pipe (2), and the shear key (3) is formed in a pair of keyholes ( It can be fastened through H).

When a plurality of keyholes (H) are formed, the shear key (3) can be independently inserted and installed into each keyhole (H). However, in this case, it takes a lot of time to combine the shear key (3).

Therefore, the keyholes (H) can be formed as a pair on both symmetrical sides so as to penetrate the upper and lower steel pipes (1, 2). In addition, the shear key (3) can be formed to be long and fastened by penetrating the keyholes (H) on both opposing sides.

The shear key 3 can be formed in the form of a bolt to form a head portion 31 that is hung on the outside of the steel pipe at the rear end.

The front end of the shear key (3) can penetrate the upper and lower steel pipes (1, 2) and be fixed on the outside of the upper and lower steel pipes (1, 2) with a fastening nut (4), etc.

The shear key 3 simply prevents the rotation of the upper steel pipe 2 and the lower steel pipe 1, and the pulling force at the connection portion of the upper and lower steel pipes 1 and 2 is supported by the stopping pieces 12 and 22. Therefore, even if there is a gap between the shear key (3) and the key hole (H), there is no risk of damage to the key hole (H) due to the pulling force.

Figure 12 is a perspective view showing the coupling relationship of the guide plates, and Figure 13 is a perspective view showing the coupling state of the guide plates.

As shown in Figures 12 and 13, on the outside of the joint between the lower steel pipe (1) and the upper steel pipe (2) at the position of the keyhole (H), it is formed in a circular arc shape in plan so as to be in close contact with the outer peripheral surface of the steel pipes (1, 2). A guide plate 6 through which the shear key 3 penetrates may be provided.

When a bolt-shaped shear key (3) is coupled through a key hole (H) formed symmetrically on both sides of the lower steel pipe (1) and the upper steel pipe (2), even if a lateral force is applied, the head portion of the bolt (31) and the fastening nut Due to (4), the locking pieces (12, 22) do not deviate laterally from the locking grooves (13, 23).

However, the entire surface of the head portion of the bolt (31) or the fastening nut (4) cannot be in close contact with the outer peripheral surface of the steel pipe (1, 2), so there is a limit to solid fixation against lateral force. In addition, the locking pieces 12 and 22 have relatively narrow upper and lower widths, so there is a risk of out-of-plane deformation when the lateral force is large.

Therefore, in order to support and reinforce the area around the joint of the steel pipes (1, 2) where the shear key (3) is connected, the outer side of the joint between the lower steel pipe (1) and the upper steel pipe (2) around the keyhole (H) where the shear key (3) is connected. The guide plate (6) can be installed.

The guide plate 6 is provided symmetrically on both sides of the upper and lower steel pipes 1, and the shear key 3 is coupled through it.

The guide plate (6) can be in close contact with the outer peripheral surface of the steel pipe (1, 2) by forming a curvature of the inner peripheral surface to be the same as the curvature of the outer peripheral surface of the steel pipe (1, 2).

The guide plate 6 can reduce manufacturing costs by forming flat iron into an arc shape through press processing.

Figure 14 is a perspective view showing an embodiment provided with a fixing nut.

As shown in Figure 14, a fixing nut (5) to which the shear key (3) is fastened is provided on the inner peripheral surface of either the lower steel pipe (1) or the upper steel pipe (2) at the key groove (14, 24). You can.

In order for the locking pieces (12, 22) to be easily inserted into the other locking grooves (23, 13), a slight gap is required between the locking pieces (12, 22) and the locking grooves (23, 13).

In this case, errors may also occur in the size of the keyhole (H) formed by the upper and lower keyways (14, 24), and the shear key (3) inserted into the keyhole (H) may fall out.

Therefore, the end of the shear key (3) can be screwed to the fixing nut (5) by attaching the fixing nut (5) to the inner peripheral surface of the lower steel pipe (1) or the upper steel pipe (2).

14 shows an embodiment in which the fixing nut 5 is coupled to the inner peripheral surface of the lower steel pipe 1, but it is also possible to couple the fixing nut 5 to the inner peripheral surface of the upper steel pipe 2.

The fixing nut (5) is fixed to the key groove (14, 24) by welding, etc., and the shear key (3) can be screwed to the fixing nut (5) through the key hole (H).

Accordingly, the shear key (3) is fixed to the fixing nut (5) to prevent separation, and the key grooves (14, 24) of the upper and lower steel pipes (1, 2) are caught by the shear key (3) to secure the upper and lower steel pipes (1, 2) Limit rotation.

1: Lower steel pipe 11: First sliding surface
12: First locking piece 121: Chamfering
13: first locking groove 14: key groove
2: upper steel pipe 21: second sliding surface
22: Second locking piece 221: Chamfering
23: second locking groove 24: key groove
3: Shear key 31: Head part
4: Fastening nut 5: Fixing nut
6: Guide plate H: Keyhole

Claims (6)

It relates to a steel pipe pile connection structure for mutually joining the upper end of the lower steel pipe (1), each of which has a circular cross section, and the lower end of the upper steel pipe (2),
The upper end of the lower steel pipe 1 is divided into at least two equal angles, and at each upper end, a first sliding surface 11 inclined in the same direction is formed in a sawtooth shape, and the first sliding surface ( 11) A first locking piece 12 extending from the first sliding surface 11 is formed protruding on the upper side of the stepped portion of the end, and the lower surface is adjacent to the lower part of the first locking piece 12. A first locking groove 13 extending from the surface 11 is formed,
The lower end of the upper steel pipe (2) is divided equally into the lower steel pipe (1), and a second sliding surface (21) at an angle corresponding to the first sliding surface (11) is formed at each lower end. It is formed in a sawtooth shape corresponding to (1), and a second locking piece 22 inserted into the first locking groove 13 is formed protruding below the side edge of the stepped portion at the end of the second sliding surface 21. A steel pipe pile connection structure, characterized in that a second locking groove (23) into which the first locking piece (12) is inserted is formed on the upper part of the second locking piece (22).
In paragraph 1:
Key grooves 14 and 24 are formed at corresponding positions on the joint surfaces of the lower steel pipe 1 and the upper steel pipe 2, respectively, and a key hole H is formed by the upper and lower key grooves 14 and 24, A steel pipe pile connection structure characterized in that a shear key (3) is inserted into the key hole (H).
In paragraph 1:
A steel pipe pile connection structure, characterized in that the upper end of the lower steel pipe (1) and the lower end of the upper steel pipe (2) are divided into three or more equal parts.
In paragraph 2,
The key holes (H) are formed as a pair at symmetrical positions on both sides of the lower steel pipe (1) and the upper steel pipe (2), and the shear key (3) is fastened through the pair of key holes (H). Characterized by steel pipe pile connection structure.
In paragraph 4,
On the outside of the joint between the lower steel pipe (1) and the upper steel pipe (2) at the keyhole (H) position, a guide plate ( 6) A steel pipe pile connection structure, characterized in that it is provided.
In paragraph 2,
Steel pipe pile connection structure, characterized in that the inner peripheral surface of either the lower steel pipe (1) or the upper steel pipe (2) is provided with a fixing nut (5) to which the shear key (3) is fastened at the key groove (14, 24) position. .

Images