JP6967930B2 - A series of steel pipe piles and sheet piles, and yatco that can be attached to and detached from steel pipe piles and sheet piles belonging to the series. - Google Patents

Description

The present invention relates to a series of steel pipe piles / steel pipe sheet piles developed with at least one of steel pipe diameters and steel pipe thicknesses different, and a yatco that can be attached to and detached from steel pipe piles / steel pipe sheet piles belonging to the series.

Steel pipe piles and steel pipe sheet piles were conventionally connected by welding and joining each single pipe brought to the construction site on site. In recent years, for connecting steel pipe piles and steel pipe sheet piles, mechanical joints that can be rapidly constructed have been adopted instead of welded joints.

As disclosed in Patent Document 1, this mechanical joint is composed of a pin joint, a box joint, a load transmission key, and a set bolt provided at the end of a steel pipe.

The box joint is provided with an inward groove on the inner peripheral surface thereof, and the load transmission key stored in the inward groove can be moved forward and backward in the radial direction by the rotation of the set bolt. The pin joint is provided with an outward groove at a position facing the inward groove provided in the box joint. For a box joint welded to one of the two steel pipes to be connected, insert a pin joint welded to the other steel pipe, and then rotate the set bolt to form an inward groove in the box joint. The stored load transmission key is inserted into the outward groove portion of the pin joint, and the joint member is integrated so that the two steel pipes are connected.

Steel pipe piles and sheet piles are driven in by vibration method, rotary method, middle digging method, pre-boring method, etc. For example, in the vibration method, vibration is applied by a vibro hammer and press-fitted into the ground, so a vibro chuck is used. If the mechanical joint provided on the steel pipe pile / steel pipe sheet pile is directly gripped, the mechanical joint may be deformed and the fitting may be hindered. Therefore, Yatko is used to avoid this.

For example, a Yatco that can be attached to and detached from a pin joint has an inner peripheral surface on which the pin joint can be inserted, and an inward groove portion is provided on this inner peripheral surface at a position facing the outward groove portion of the pin joint. There is. The load transmission key is inserted from the outside of the yatco through the opening provided in the main body, and is arranged so as to straddle the inward groove portion and the outward groove portion provided in the pin joint. It is configured to be mechanically connected to the joint.

By the way, steel pipe piles and steel pipe sheet piles are developed in series such that the steel pipe diameter is Φ400 to 1600 mm and the steel pipe thickness is 9 to 30 mm. Therefore, it was necessary to prepare a Yatco having a size corresponding to a pin joint having a different outer diameter depending on the steel pipe diameter and thickness of the steel pipe pile / steel pipe sheet pile.

Japanese Unexamined Patent Publication No. 2000-31987

The present invention has been made in view of the above circumstances, and is a series of steel pipe piles / steel pipe sheet piles in which the same yatko can be connected even if the steel pipe piles have different diameters, and the axis alignment is easy at that time. The purpose is to provide removable yatko to steel pipe piles and steel pipe sheet piles belonging to the series.

In order to achieve the above object, the characteristic configuration of the steel pipe pile / steel pipe sheet pile series of the present invention is a series of steel pipe piles / steel pipe sheet piles developed by differentiating at least one of the steel pipe diameter and the steel pipe thickness. , A mechanical joint having a size corresponding to the diameter of the steel pipe and the thickness of the steel pipe was provided at the end of the steel pipe, and the mechanical joint was provided on one of the two steel pipes connected to each other. It has a pin joint and a box joint provided on the other steel pipe, and by engaging with an outward concave portion provided on the outer peripheral surface of the pin joint , the pin joint and the box joint are made of a steel pipe. An inward convex portion is provided to prevent the pin joint from being separated in the axial direction, and the shaft of the steel pipe is provided on a part of the outer peripheral surface of the pin joint regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe to which the pin joint is provided. An outward reference surface with a constant distance from the center is provided , and the inward convex portion is arranged so as to straddle the outward concave portion and the inward concave portion provided on the inner peripheral surface of the box joint. It is composed of a load transmission key, and the outward reference surface is provided at a position different from the outward recess on the outer peripheral surface of the pin joint, and is different from the inward recess on the inner peripheral surface of the box joint. At the position, the distance from the axis of the steel pipe is set to be the same as the distance from the axis of the steel pipe of the outward reference plane regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe provided with the box joint. It has a group of steel pipe piles provided with an facing fitting surface, the inward fitting surface is provided at the tip portion of the inner peripheral surface of the box joint, and the outward reference surface is the outer periphery of the pin joint. It is a point having a group of steel pipes constituting the outward fitting surface provided at a position facing the inward fitting surface among the surfaces.

According to the above configuration, since the key member can be moved by the position fixing mechanism, the key member can take a plurality of straddling positions. Therefore, the yatko has a size that can be surrounded by the yatko, and the outward recess can be attached to the first joint in a position where the key member can be pushed.

Therefore, Yatco is, for example, a pin provided in a group of steel pipes having different steel pipe diameters or steel pipe thicknesses belonging to a series of steel pipe piles and steel pipe sheet piles developed by differently at least one of steel pipe diameters or steel pipe thicknesses. Can be attached to and detached from the joint.

On a part of the outer peripheral surface of the pin joint , the inside facing the outward reference surface where the distance from the axis of the steel pipe is set to be constant regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe in which the pin joint is provided. by using the forceps-orientation reference surface is provided, by attachment to the pin joint of the tongs, and inwardly reference surface and the outward reference surface is fitted, automatically axial alignment of the forceps and the pin joint Will be done.

The outward concave portion means a concave portion opened outward in the radial direction of the steel pipe, and the inward concave portion means a concave portion opened inward in the radial direction of the steel pipe. Further, the inwardly convex portion means a convex portion protruding inward in the radial direction of the steel pipe.

According to the above configuration, the pin joint can be provided with an outward reference plane while maintaining the same configuration of the mechanical joint.

According to the above configuration, when the pin joint and the box joint are connected, the outward fitting surface and the inward fitting surface are fitted.

To achieve the above object, characteristic feature of the forceps of the present invention, detachable from the pin joint at least one is provided on each of the different steel group steel diameter or steel pipe thickness having a feature structure of the above forceps At least, the pin joint is provided at a position facing the outward recess on the inner peripheral surface of the main body and the main body that can surround the portion of the pin joint where the outward recess is provided. and inward recesses, and retaining key locatable in straddled position across said outwardly concave portion provided on the pin joint, the outer diameter of the portion where the outward recesses are provided in said different pin joint Even if there is, a position fixing mechanism capable of fixing the retaining key at the straddling position is provided, and an outward direction provided on a part of the outer peripheral surface of the pin joint on the inner peripheral surface of the main body portion. The point is that an inward reference surface that can be fitted to the reference surface is provided.
Further, in order to achieve the above-mentioned object, the characteristic configuration of the Yatco of the present invention is a series of steel pipe piles / steel pipe sheet piles developed by differently at least either the steel pipe diameter or the steel pipe thickness, and the end of the steel pipe. A mechanical joint having a size corresponding to the diameter of the steel pipe and the thickness of the steel pipe is provided in the portion, and the mechanical joint is the first joint provided in one of the two steel pipes connected to each other. , The second joint provided in the other steel pipe, and by engaging with the outward concave portion provided in the first joint, the first joint and the second joint are connected to the axial center of the steel pipe. An inward convex portion is provided to prevent the first joint from being separated in the direction, and the shaft of the steel pipe is provided on a part of the outer peripheral surface of the first joint regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe to which the first joint is provided. It is provided in each steel pipe group that belongs to the series of steel pipe piles and steel pipe sheet piles that have a steel pipe group provided with an outward reference plane with a constant distance from the center, and has a different steel pipe diameter or thickness. A main body that can be attached to and detached from the first joint and that can surround at least the portion of the first joint where the outward recess is provided, and the outer side of the inner peripheral surface of the main body. An inward recess provided at a position facing the facing recess, a retaining key that can be arranged at a straddling position straddling the outward recess provided in the first joint, and an outward recess are provided. Even if the first joint has a different outer diameter of the portion, the first joint is provided with a position fixing mechanism capable of fixing the retaining key at the straddling position, and the first one is provided on the inner peripheral surface of the main body. The point is that an inward reference surface that can be fitted to the outward reference surface provided on a part of the outer peripheral surface of the joint is provided.

According to the above configuration, by attaching the Yatco to the first joint (pin joint) , the inward reference surface and the outward reference surface are fitted, and the axis alignment between the Yatco and the first joint (pin joint) is aligned. It will be done automatically.

In order to achieve the above object, the characteristic configuration of the steel pipe pile / steel pipe sheet pile series of the present invention is a series of steel pipe piles / steel pipe sheet piles developed by differentiating at least one of the steel pipe diameter and the steel pipe thickness. , A mechanical joint having a size corresponding to the diameter of the steel pipe and the thickness of the steel pipe was provided at the end of the steel pipe, and the mechanical joint was provided on one of the two steel pipes connected to each other. It has a pin joint and a box joint provided on the other steel pipe, and by engaging with an inwardly concave portion provided on the inner peripheral surface of the box joint , the pin joint and the box joint are made of a steel pipe. An outward convex portion is provided to prevent the box joint from being separated in the axial direction, and the steel pipe is provided on a part of the inner peripheral surface of the box joint regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe to which the pin joint is provided. An inward reference surface with a constant distance from the axis of the pin is provided, and the outward convex portion is arranged so as to straddle the inward concave portion and the outward concave portion provided on the outer peripheral surface of the pin joint. The inward reference surface is provided at a position different from the inward recess on the inner peripheral surface of the box joint, and is the outward recess on the outer peripheral surface of the pin joint. The distance from the axis of the steel pipe is set to be the same as the distance from the axis of the steel pipe of the inward reference plane at different positions regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe provided with the pin joint. It has a group of steel pipe piles provided with an outward fitting surface, and the inward reference surface constitutes an inward fitting surface provided at the tip portion of the inner peripheral surface of the box joint, and is outward. It is preferable that the fitting surface has a steel pipe group provided at a position facing the inward fitting surface on the outer peripheral surface of the pin joint.

According to the above configuration, since the key member can be moved by the position fixing mechanism, the key member can take a plurality of straddling positions. Therefore, the yatko has a size that can surround the yatko, and the inward concave portion can be attached to the box joint in a position where the key member can be pushed.

Therefore, Yatco is, for example, a box provided in a group of steel pipes having different steel pipe diameters or steel pipe thicknesses belonging to a series of steel pipe piles / steel pipe sheet piles developed by differently at least one of steel pipe diameters or steel pipe thicknesses. Can be attached to and detached from the joint.

The part of the inner peripheral surface of the box joint, opposite the inwardly facing reference surface distance from the axis is set to a constant of the steel pipe irrespective of the steel pipe diameter and steel thickness of the steel pipe to the box fitting is provided, by using the forceps to outward reference surface is provided, by attachment to the forceps box joint, is fitted with an outward reference surface and the inner-facing reference surface, the axis alignment of the forceps and the box joint automatically Will be made.

The outward concave portion means a concave portion opened outward in the radial direction, and the inward concave portion means a concave portion opened inward in the radial direction. Further, the outward convex portion means a convex portion protruding outward in the radial direction.

According to the above configuration, the box joint can be provided with an inward reference plane while maintaining the same configuration of the mechanical joint.

According to the above configuration, when the box joint and the pin joint are connected, the inward fitting surface and the outward fitting surface are fitted.

To achieve the above object, characteristic feature of the forceps of the present invention belongs to a series of steel pipe piles, steel pipe sheet piles having a feature configuration described above, the steel pipe diameter or respectively at least one different steel group steel Thickness A main body portion that is removable from the provided box joint and can be surrounded by at least a portion of the box joint where the inward concave portion is provided, and the inward facing portion of the outer peripheral surface of the main body portion. A retaining key that can be placed at a straddling position straddling the outward recess provided at a position facing the recess and the inward recess provided in the box joint, and a portion provided with the inward recess. Even if the box joint has a different inner diameter, a position fixing mechanism for fixing the retaining key to a straddling position straddling the outward recess and the inward recess is provided, and the outer periphery of the main body is provided. The surface is provided with an outward reference surface that can be fitted to an inward reference surface provided on a part of the inner peripheral surface of the box joint.
In order to achieve the above-mentioned object, the characteristic configuration of the Yatco of the present invention is a series of steel pipe piles / steel pipe sheet piles developed by differently at least either the steel pipe diameter or the steel pipe thickness, and at the end of the steel pipe. A mechanical joint having a size corresponding to the steel pipe diameter and the steel pipe thickness is provided, and the mechanical joint is the first joint provided on one of the two steel pipes connected to each other and the other. The first joint and the second joint are aligned in the axial direction of the steel pipe by having the second joint provided in the steel pipe of the above and engaging with the inward concave portion provided in the second joint. An outward convex portion is provided to prevent separation, and the axial center of the steel pipe is provided on a part of the inner peripheral surface of the second joint regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe to which the first joint is provided. It is provided in each steel pipe group that belongs to the series of steel pipe piles and steel pipe sheet piles that have a steel pipe group provided with an inward reference plane with a constant distance from the steel pipe group and that have different steel pipe diameters or steel pipe thicknesses. A yatko that is removable from the second joint and can be surrounded by at least the portion of the second joint where the inward recess is provided, and the inward recess of the outer peripheral surface of the main body. A retaining key that can be placed at a straddling position straddling the outward recess provided at a position facing the second joint and the inward recess provided in the second joint, and a portion provided with the inward recess. Even in the second joint having a different inner diameter, a position fixing mechanism for fixing the retaining key to a straddling position straddling the outward recess and the inward recess is provided, and the main body portion is provided. The outer peripheral surface is provided with an outward reference surface that can be fitted to the inward reference surface provided on a part of the inner peripheral surface of the second joint.

According to the above configuration, by attaching the Yatco to the second joint (box joint) , the outward reference surface and the inward reference surface are fitted, and the axis alignment between the Yatco and the second joint (box joint) is aligned. It will be done automatically.

Explanatory drawing of steel pipe pile belonging to series of steel pipe pile which concerns on this invention Explanatory drawing of steel pipe pile in vibration method Explanatory drawing of Yatco and pin joint which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of Yatco and box joint which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of the main part of Yatco which concerns on this invention Explanatory drawing of pull-back member Explanatory drawing of pull-back member Explanatory drawing of pull-back member Explanatory drawing of pull-back member Explanatory drawing of attachment to pin joint of Yatco which concerns on this invention Explanatory drawing of Yatco and pin joint which concerns on this invention Explanatory drawing of Yatco and pin joint which concerns on this invention

Hereinafter, a series of steel pipe piles / steel pipe sheet piles according to the present invention and an embodiment of a yatco that can be attached to and detached from steel pipe piles / steel pipe sheet piles belonging to the series will be described with reference to the drawings. FIG. 1 shows steel pipe piles P (P1, P2) as an example of steel pipe piles belonging to a series of steel pipe piles to which YATCO can be attached and detached.

The steel pipe piles P (P1, P2) are connected by a mechanical joint J provided at the end of the steel pipe S (S1, S2) in a retaining state and a rotation preventing state. The steel pipe S may be a spiral steel pipe, a welded pipe such as a UO steel pipe, a seamless steel pipe, a forge welded steel pipe, a cast steel pipe or the like.

The mechanical joint J is composed of a box joint 10, a pin joint 20, a load transmission key 30, and a set bolt 31 provided at the end of the steel pipe S (S1, S2).

As shown in FIGS. 1 and 8, the box joint 10 is provided with a single inward groove portion 12 on the inner peripheral surface 11 thereof along the circumferential direction. The load transmission key 30 stored in the inward groove portion 12 is configured to be able to move forward and backward in the radial direction by the rotation of the set bolt 31. The inward groove portion 12 has a depth capable of storing the entire thickness of the load transmission key 30. Further, a plurality of second notch recesses 14 are provided at equal intervals on the edge of the outer peripheral surface 13 of the box joint 10 at equal intervals in the circumferential direction.

As shown in FIGS. 1 and 3, the pin joint 20 is provided with a single outward groove portion 22 along the circumferential direction at a position facing the inward groove portion 12 provided in the box joint 10 on the outer peripheral surface 21 thereof. Has been done. The outward groove portion 22 is configured to have a depth capable of storing approximately half the thickness of the load transmission key 30. Further, on the edge of the outer peripheral surface 23 of the pin joint 20, a first notch recess 24 is provided at a position facing the second notch recess 14 provided in the box joint 10.

The load transmission key 30 is composed of a plurality of arcuate plates divided in the circumferential direction. The box joint 10 is provided with a through hole 15 that communicates from the outer peripheral surface 13 into the inward groove portion 12 corresponding to each load transmission key 30. A set bolt 31 is provided in each through hole 15.

When the set bolt 31 is rotated after the pin joint 20 is inserted into the box joint 10, the load transmission key 30 stored in the inward groove portion 12 of the box joint 10 enters the outward groove portion 22 of the pin joint 20. By arranging so as to straddle the inward groove portion 12 and the outward groove portion 22, the box joint 10 and the pin joint 20 are connected in a retaining state.

A key groove is formed by the second notch recess 14 and the first notch recess 24, and by attaching the rotation restraining key 33 to the key groove, the box joint 10 and the pin joint 20 are connected in a non-rotating state. The relative rotation of the two spliced steel pipe piles P (P1, P2) is prevented. The rotation suppression key 33 is fixed in the keyway by a fixing screw 34 screwed into a screw hole provided in the pin joint 20.

The box joint 10 in the present embodiment is the second joint according to the present invention, the inward groove portion 12 is the inward concave portion according to the present invention, and the pin joint 20 is the first joint according to the present invention. 22 is an outward concave portion according to the present invention, and the load transmission key 30 is an inward convex portion and an outward convex portion according to the present invention.

When driving such a steel pipe pile P into the ground by a vibration method while applying vibration by a vibro hammer, as shown in FIG. 2, a pin of the steel pipe pile P is used by a vibro chuck C suspended from a crane K. In order to avoid directly gripping the joint 20 or the box joint 10, the Yatco Y according to the present invention is used.

The steel pipe pile P can be driven so that the box joint 10 is on the front side in the traveling direction or the pin joint 20 can be driven on the front side in the traveling direction when the steel pipe pile P is driven.

Here, first, when the box joint 10 is driven so as to be on the front side in the traveling direction, the Yatco Y1 configured to be detachably attached to the pin joint 20 on the rear side in the driving direction will be described.

As shown in FIG. 3, the Yatco Y1 has a cylindrical main body portion 40 that can surround the outer peripheral surface 21 provided with the outward groove portion 22 of the pin joint 20.

An inward groove 42 is provided at a position of the inner peripheral surface 41 of the main body 40 facing the outward groove 22 of the pin joint 20. The inward groove portion 42 in the present embodiment is an inward recess according to the present invention. The main body 40 of the Yatco Y1 is provided with an opening 49 communicating with the inward groove 42.

As shown in FIG. 4, the Yatco Y1 is provided with a retaining key 44 that is arranged so as to straddle the inward groove portion 42 and the outward groove portion 22 and prevents the pin joint 20 from coming off.

Similar to the load transmission key 30, the retaining key 44 is configured by having a plurality of arcuate plates divided in the circumferential direction. As shown in FIGS. 13 and 15, each retaining key 44 is provided with a recess 47 to which the ball of the ball plunger 46, which will be described later, can be engaged. One end of the retaining key 44 is formed in an L shape, and a radius is provided inside the corner portion for the purpose of improving durability.

A through hole 45 is provided in the main body 40 of the Yatco Y1 along the radial direction of the steel pipe pile P. A ball plunger 46 is screwed into the through hole 45. The through hole 45 and the ball plunger 46 in the present embodiment are the position fixing mechanisms according to the present invention.

The ball plunger 46 has a built-in spring in the main body, and when a load is applied to the ball at the tip, the ball sinks inside the main body against the urging force of the spring, and when the load is released, the urging force of the spring causes the ball to sink. The ball is configured to return to its original position.

The ball plunger 46 has a straddling position (see FIG. 4) in which the retaining key 44 is stored in the inward groove portion 42 and straddles the inward groove portion 42 and the outward groove portion 22 provided in the pin joint 20. It can be moved to (see FIG. 5) and fixed at this position.

When the ball plunger 46 moves inward in the radial direction of the steel pipe pile P, as long as the male screw provided on the main body of the ball plunger 46 is screwed into the female screw provided in the through hole 45. It can protrude from the inward groove portion 42 of the Yatco Y1. By changing the protruding length of the ball plunger 46, the retaining key 44 can take a plurality of straddling positions.

Therefore, if the Yatco Y1 is a pin joint 20 having a size that can be surrounded by the Yatco Y1, and the outward groove portion 22 is a pin joint 20 at a position where the retaining key 44 can be pushed by the ball plunger 46. , It can be attached to and detached from the pin joint 20 having a different diameter and thickness provided in the steel pipe belonging to the steel pipe pile P having different steel pipe diameters and thicknesses in the series.

Therefore, in a series of steel pipe piles having a steel pipe diameter of Φ400 to 1600 mm and a steel pipe thickness of 9 to 30 mm, as shown in FIGS. 5 and 6, two patterns of pin joints in which the radius of the outer peripheral surface 21 differs by several mm. If the inner diameter of the inner peripheral surface 41 of the Yatco Y1 is large enough to surround the pin joint 20 having the larger outer diameter with respect to 20 and 201, the retaining key 44 is the pin having the smaller outer diameter. Even if the outward groove portion 22 of the joint 201 is configured so as to be able to take a straddling position straddling the outward groove portion 22 and the inward groove portion 42, the Yatco Y1 has either pin joint 20 or It can also be attached to and detached from 201.

As shown in FIGS. 5 and 6, the gap between the outer peripheral surface 21 of the pin joint 201 and the inner peripheral surface 41 of the Yatco Y1 when the Yatco Y1 is attached to the pin joint 201 is such that the Yatco Y1 is attached to the pin joint 20. It is larger than the gap between the outer peripheral surface 21 of the pin joint 20 and the inner peripheral surface 41 of the Yatco Y1 when it is attached.

In the series of steel pipe piles, for example, the steel pipe diameter and the steel pipe diameter of the steel pipe in which the pin joints 20 and 201 are provided on a part of the outer peripheral surface 21 of the pin joints 20 and 201 in the pin joints 20 and 201 to which the same YATCO Y1 can be attached and detached. The outward reference surface 26 whose distance from the axis of the steel pipe is set to be constant regardless of the thickness of the steel pipe is located at a position different from the outward groove portion 22, preferably the outer peripheral surface 21 of the pin joints 20 and 201. It is provided on the base end side. In the present embodiment, the outward reference surface 26 of the pin joint 20 is flush with the outer peripheral surface 21. The outward reference surface 26 constitutes an outward fitting surface that can be fitted with the inward fitting surface 16 provided in the box joint 10.

Correspondingly, the Yatco Y1 is provided with an inward reference surface 410 that can be fitted to the outward reference surface 26. In this embodiment, the inward reference surface 410 of the Yatco Y1 is flush with the inner peripheral surface 41. By attaching the Yatco Y1 to the pin joints 20 and 201, the inward reference surface 410 and the outward reference surface 26 are fitted, and the axis alignment between the Yatco Y1 and the pin joints 20 and 201 is automatically performed.

In addition, in the steel pipe pile group belonging to the series of steel pipe piles, the distance from the axis of the steel pipe is the axis of the steel pipe of the outward reference surface 26 regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe provided with the box joint 10. The inward fitting surface 16 set to be the same as the distance from the center is on the tip end side of the box joints 10 and 101, and is at a position different from the inward groove portion 12 of the inner peripheral surface 11 and the pin joint 20. It is provided at a position facing the outward reference surface 26 of 201.

As a result, as shown in FIG. 1, when the pin joint 20 and the box joint 10 are connected, the outward reference surface 26 and the inward fitting surface 16 constituting the outward fitting surface are fitted. .. Even when the pin joint 201 and the box joint 101 are connected, the outward reference surface 26 and the inward fitting surface 16 constituting the outward fitting surface are fitted.

In this way, the mechanical joint can be provided with the outward reference surface 26 and the inward fitting surface 16 while maintaining the same configuration as the mechanical joint.

The depth of the inward groove 42 provided in the main body 40 is made deeper than the depth of the inward groove 12 provided in the box joint 10, and the thickness of the retaining key 44 is made thicker than the thickness of the load transmission key 30. By making the lengths of the through hole 45 and the ball plunger 46 sufficient, it is possible to increase the change allowance of the protrusion length of the retaining key 44 from the inward groove portion 42.

When the steel pipe pile P is driven by the vibration method, the retaining key 44 that prevents the steel pipe pile P and the Yatco Y1 from coming off is also vibrated at a high frequency. If a mere bolt is used for the position fixing mechanism, the bolt may be loosened due to high-frequency vibration, the position of the retaining key 44 may be displaced, and the retaining may be released.

On the other hand, in the Yatco Y1 according to the present invention, since the ball plunger 46 is used for the position fixing mechanism as described above, the spring built in the ball plunger 46 can absorb the vibration. Therefore, the ball plunger 46 does not loosen. Therefore, the retaining key 44 is maintained at a straddling position where the retaining key 44 can be prevented. Further, there is no possibility that the contact positions of the balls of the ball plunger 46 will be displaced from each other by engaging with the recess 47 provided in the retaining key 44.

The Yatco Y1 is provided with a main body notched recess 48 at a position facing the first notched recess 24 provided in the pin joint 20 in the edge portion of the outer peripheral surface 43. By straddling the above-mentioned rotation restraining key 33 in the key groove composed of the first notched recess 24 and the main body notched recess 48, the Yatco Y1 and the pin joint 20 rotate relatively around the axis. Is prevented.

The procedure for attaching the Yatco Y1 configured as described above to the pin joint 20 will be described. First, the rotation restraint key 33 is attached to the completely missing recess 24 of the pin joint 20 of the steel pipe pile P whose box joint 10 side is driven into the ground. Next, the Yatco Y1 gripped by the vibro chuck is suspended from the pin joint 20. At that time, the rotation restraining key 33 and the main body notch recess 48 are fitted, and the Yatco Y1 and the pin joint 20 are fixed in the circumferential direction, and the inward reference surface 410 and the outward reference surface 26 are fitted. This automatically aligns the axes of the Yatco Y1 and the pin joint 20.

Next, the retaining key 44 is inserted from the tip through the opening 49 of the main body 40 of Yattoko Y1 and along the key groove composed of the inward groove 42 and the outward groove 22 provided in the pin joint 20. Then, the recess 47 of the retaining key 44 is slid in the circumferential direction until it meets the through hole 45.

Then, as shown in FIG. 17, the ball plunger 46 is screwed into the through hole 45 and moved inward in the radial direction of the steel pipe pile P, and the retaining key 44 is provided on the inward groove portion 42 and the outer side of the Yatco Y1. It is securely fixed at the straddling position straddling the facing groove portion 22.

After that, a cushioning material is sandwiched between the retaining keys 44 facing each other in the circumferential direction inside the opening 4, and the opening 49 is formed with, for example, aluminum tape in order to prevent earth and sand from entering the key groove from the opening 49. By closing, the attachment of the yatco Y1 to the pin joint 20 of the steel pipe pile P is completed.

The Yatco Y1 needs to be removed from the pin joint 20 of the steel pipe pile P after driving the steel pipe pile P to which it is attached to a predetermined depth. As shown in FIG. 7, the retaining key 44 can be easily pulled back from the straddling position to the retracted position by screwing a hexagon bolt as a pull-back member into the female screw provided in the recess 47 of the retaining key 44. .. The pull-back member is not limited to a bolt member such as a hexagon bolt, as long as it can be screwed into a female screw provided on the retaining key 44, and may be a bolt member such as a threaded rod.

In this way, the connection of the Yatco Y1 to the steel pipe pile P is easily released by moving the retaining key 44 from the straddle position to the storage position by the pull-back member, whereby the Yatco Y1 can be removed from the steel pipe pile P. can.

In the above-described embodiment, the case where the outward concave portion is a single outward groove portion 22 provided on the outer peripheral surface 21 of the pin joint 20 along the circumferential direction is described, but the present invention is not limited to this. The outward recess does not have to go around the outer peripheral surface 21 along its circumferential direction, and may be an outward groove portion intermittently provided on the outer peripheral surface 21 of the pin joint 20. Further, the outward concave portion does not have to be groove-shaped, and may be concave-shaped. Any shape may be used as long as the load transmission key 30 as the inwardly convex portion can be engaged.

In the above-described embodiment, the case where the inward concave portion is a single inward groove portion 42 provided on the inner peripheral surface 41 of the main body portion 40 of the Yatco Y1 along the circumferential direction has been described, but the present invention is limited to this. No. The inward recess does not have to go around the inner peripheral surface 41 along the circumferential direction, and may be an inward groove portion intermittently provided on the inner peripheral surface 41 of the main body portion 40. Further, the inwardly facing recess does not have to be groove-shaped, and may be recessed. The shape of the retaining key 44 may be any as long as it can be engaged.

In the above-described embodiment, the outward reference surface 26 is provided on the outer peripheral surface 21, but as shown in FIGS. 18 and 19, the outward reference surface 26 may be provided on the outer peripheral surface 23. FIG. 18 shows that the Yatco Y1 is attached to the pin joint 20 having the larger outer diameter, and FIG. 19 shows the Yatko Y1 attached to the pin joint 201 having the smaller outer diameter. It is shown. Regardless of whether the pin joint 20 has a large outer diameter or the pin joint 201 has a small outer diameter, the outward reference surface 26 is set to have the same distance from the axis of the steel pipe. In Yatco Y1, the inward reference surface 410 is provided at a position facing the outward reference surface 26.

In the above-described embodiment, the position fixing mechanism has the ball plunger 46, but the present invention is not limited to this. The position fixing mechanism may have a pin plunger instead of the ball plunger 46.

Next, when the pin joint 20 is driven so as to be on the front side in the traveling direction, the Yatco Y2 configured to be detachably attached to the box joint 10 on the rear side in the driving direction will be described.

As shown in FIG. 8, the Yatco Y2 has a shaft-shaped main body portion 50 that can be surrounded by an inner peripheral surface 11 provided with an inward groove portion 12 of the box joint 10.

An outward groove 52 is provided at a position of the outer peripheral surface 51 of the main body 50 facing the inward groove 12 of the box joint 10. The outward groove portion 52 in the present embodiment is an outward recess according to the present invention. The main body 50 of the Yatco Y2 is provided with an opening 59 that communicates with the outward groove 52.

As shown in FIG. 9, the Yatco Y2 is provided so as to straddle the outward groove portion 52 and the inward groove portion 12 and has a retaining key 54 for preventing the box joint 10 from coming off.

Like the load transmission key 30, the retaining key 54 is composed of a plurality of arcuate plates divided in the circumferential direction. Each retaining key 54 is provided with a recess 57 to which the ball of the ball plunger 56, which will be described later, can be engaged. One end of the retaining key 54 is formed in an L shape, and a radius is provided inside the corner portion for the purpose of improving durability.

A through hole 55 is provided in the main body 50 of the Yatco Y2 along the radial direction of the steel pipe pile P. A ball plunger 56 is screwed into the through hole 55. The through hole 55 and the ball plunger 56 in the present embodiment are the position fixing mechanisms according to the present invention. The ball plunger 56 has the same configuration as the ball plunger 46, and can exert the same action and effect.

The ball plunger 56 has a straddling position (see FIG. 9) in which the retaining key 54 is stored in the outward groove portion 52 and straddles the outward groove portion 52 and the inward groove portion 12 provided in the box joint 10. It can be moved to (see FIG. 10) and fixed at this position.

When the ball plunger 56 moves outward in the radial direction of the steel pipe pile P, as long as the male screw provided on the main body of the ball plunger 56 is screwed into the female screw provided in the through hole 55. It can protrude from the outward groove portion 52 of the Yatco Y2. By changing the protruding length of the ball plunger 56, the retaining key 54 can take a plurality of straddling positions.

Therefore, if the Yatco Y2 is a box joint 10 having a size that can surround the Yatco Y2 and the inward groove portion 12 is in a position where the retaining key 54 can be pushed by the ball plunger 56, the Yatco Y2 is a box joint 10. It can be attached to and detached from a box joint 10 having a different diameter and thickness provided in a steel pipe belonging to a steel pipe pile P having a series of different steel pipe diameters and thicknesses.

Therefore, in a series of steel pipe piles having a steel pipe diameter of Φ400 to 1600 mm and a steel pipe thickness of 9 to 30 mm, as shown in FIGS. 10 and 11, two patterns of boxes in which the radius of the inner peripheral surface 11 differs by several mm. If the outer diameter of the outer peripheral surface 51 of the Yatco Y2 is large enough to be surrounded by the box joint 101 having the smaller inner diameter with respect to the joint 10, the retaining key 54 is the box joint 10 having the larger inner diameter. Even if the inward groove portion 12 is configured, the Yatco Y2 can be used in either of the box joints 10 and 101 as long as it can take a straddling position straddling the inward groove portion 12 and the outward groove portion 52. It can be attached and detached.

As shown in FIGS. 10 and 12, when the Yatco Y2 is attached to the box joint 10, the gap between the inner peripheral surface 11 of the box joint 10 and the outer peripheral surface 51 of the Yatco Y2 is such that the Yatco Y2 is attached to the box joint 101. It is larger than the gap between the inner peripheral surface 11 of the box joint 101 and the outer peripheral surface 51 of the Yatco Y2 when it is attached.

In the series of steel pipe piles, for example, the steel pipe diameter of the steel pipe in which the box joints 10 and 101 to which the same YATCO Y2 can be attached and detached is provided with the box joints 10 and 101 on a part of the inner peripheral surface 11 of the box joints 10 and 101. And the inward reference surface 16 in which the distance from the axis of the steel pipe is set to be constant regardless of the thickness of the steel pipe is located at a position different from the inward groove portion 12, preferably the inner peripheral surface of the box joints 10 and 101. It is provided on the tip end side of 11. In the present embodiment, the inward reference surface 16 of the box joint 10 is flush with the inner peripheral surface 11. The inward reference surface 16 constitutes an inward fitting surface that can be fitted with the outward fitting surface 26 provided in the pin joint 20.

Correspondingly, the Yatco Y2 is provided with an outward reference surface 510 that can be fitted to the inward reference surface 16. By attaching the Yatco Y2 to the box joints 10 and 101, the outward reference surface 510 and the inward reference surface 16 are fitted, and the axis alignment between the Yatco Y2 and the box joints 10 and 101 is automatically performed.

In the steel pipe pile group belonging to the series of steel pipe piles, the distance from the axis of the steel pipe is the steel pipe with the inward reference plane 16 regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe in which the pin joints 20 and 201 are provided. The outward fitting surface 26 set to be the same as the distance from the axial center of the steel pipe is on the proximal end side of the pin joints 20 and 201, and is at a position different from the outward groove portion 22 of the outer peripheral surface 21 and is a box joint. It is provided at a position facing the inward reference surface 16 of the 10 and 101.

As a result, as shown in FIG. 1, when the pin joint 20 and the box joint 10 are connected, the inward reference surface 16 and the outward fitting surface 26 constituting the inward fitting surface are fitted. .. Even when the pin joint 201 and the box joint 101 are connected, the inward reference surface 16 and the outward fitting surface 26 constituting the inward fitting surface are fitted.

In this way, the mechanical joint can be provided with the inward reference surface 16 and the outward fitting surface 26 while maintaining the same configuration as the mechanical joint.

The depth of the outward groove 52 provided in the main body 50 is made deeper than the depth of the inward groove 12 provided in the box joint 10, and the thickness of the retaining key 54 is made thicker than the thickness of the load transmission key 30. By making the lengths of the through hole 55 and the ball plunger 56 sufficiently long, it is possible to increase the change allowance of the protrusion length of the retaining key 54 from the outward groove portion 52.

When the steel pipe pile P is driven by the vibration method, the retaining key 54 that prevents the steel pipe pile P and the Yatco Y2 from coming off is also vibrated at a high frequency. If a mere bolt is used for the position fixing mechanism, the bolt may be loosened due to high-frequency vibration, the position of the retaining key 54 may be displaced, and the retaining may be released.

On the other hand, in the Yatco Y2 according to the present invention, since the ball plunger 56 is used for the position fixing mechanism as described above, the spring built in the ball plunger 56 can absorb the vibration. Therefore, the ball plunger 56 does not loosen. Therefore, the retaining key 54 is maintained at a straddling position where the retaining key 54 can be prevented. Further, there is no possibility that the contact positions of the balls of the ball plunger 56 will be displaced from each other by engaging with the recess 57 provided in the retaining key 54.

The Yatco Y2 is provided with a main body notch recess 58 at a position facing the second notch recess 14 provided in the box joint 10 in the edge portion of the outer peripheral surface 53. By straddling the above-mentioned rotation restraining key 33 in the key groove composed of the second notch recess 14 and the main body notch recess 58, the yatco Y2 and the box joint 10 rotate relatively around the axis. Is prevented.

The procedure for attaching the Yatco Y2 configured as described above to the box joint 10 will be described. First, the rotation restraint key 33 is attached to the second notch recess 14 of the box joint 10 of the steel pipe pile P whose pin joint 20 side is driven into the ground. Next, the Yatco Y2 gripped by the vibro chuck is suspended from the box joint 10. At that time, the rotation restraining key 33 and the main body notch recess 58 are fitted, and the Yatco Y2 and the box joint 10 are fixed in the circumferential direction, and the outward reference surface 510 and the inward reference surface 16 are fitted. This automatically aligns the axes of the Yatco Y2 and the box joint 10.

Next, the retaining key 54 is inserted from the tip through the opening 59 of the main body 50 of the Yattoko Y2, and along the key groove composed of the outward groove 52 and the inward groove 12 provided in the box joint 10. Then, the recess 57 of the retaining key 54 is slid in the circumferential direction until it meets the through hole 55.

Then, the ball plunger 56 is screwed into the through hole 55 and moved outward in the radial direction of the steel pipe pile P, and the retaining key 54 straddles the outward groove portion 52 and the inward groove portion 12 provided in the Yatco Y2. Securely fix it in the installation position.

After that, a cushioning material is sandwiched between the retaining keys 54 facing each other in the circumferential direction inside the opening 59, and the opening 59 is formed with, for example, aluminum tape in order to prevent earth and sand from entering the key groove from the opening 59. By closing, the attachment of the Yatco Y2 to the box joint 10 of the steel pipe pile P is completed.

The Yatco Y2 needs to be removed from the box joint 10 of the steel pipe pile P after driving the steel pipe pile P to which it is attached to a predetermined depth. As shown in FIG. 11, a hexagon bolt as a pull-back member is screwed into a female screw provided in the recess of the pull-out key 54, and the pull-out key 54 can be easily pulled back from the straddle position to the retracted position. The pull-back member is not limited to a bolt member such as a hexagon bolt, as long as it can be screwed into a female screw provided on the retaining key 54, and may be a bolt member such as a threaded rod.

In this way, the connection of the Yatco Y2 to the steel pipe pile P is easily released by moving the retaining key 54 from the straddle position to the storage position by the pull-back member, whereby the Yatco Y2 can be removed from the steel pipe pile P. can.

In the above-described embodiment, the case where the inwardly concave portion is a single inward groove portion 12 provided on the inner peripheral surface 11 of the box joint 10 along the circumferential direction has been described, but the present invention is not limited to this. The inward recess does not have to go around the inner peripheral surface 11 along the circumferential direction, and may be an inward groove portion intermittently provided on the inner peripheral surface 11 of the box joint 10. Further, the inwardly facing recess does not have to be groove-shaped, and may be recessed. Any shape may be used as long as the load transmission key 30 as the outward convex portion can be engaged.

In the above-described embodiment, the case where the outward recess is a single outward groove 52 provided along the circumferential direction on the outer peripheral surface 51 of the main body 50 of the Yatco Y2 has been described, but the present invention is not limited to this. .. The outward concave portion does not have to go around the outer peripheral surface 51 along its circumferential direction, and may be an outward groove portion intermittently provided on the outer peripheral surface 51 of the main body portion 50. Further, the outward concave portion does not have to be groove-shaped, and may be concave-shaped. The shape of the retaining key 54 may be any as long as it can be engaged.

In the above-described embodiment, the position fixing mechanism has the ball plunger 56, but the present invention is not limited to this. The position fixing mechanism may have a pin plunger instead of the ball plunger 56.

In the above-described embodiment, as shown in FIGS. 7 and 11, a hexagon bolt as a pull-back member is screwed into the female screws provided in the recesses 47 and 57 of the retaining key 44 and the retaining key 54, respectively. , The configuration for moving the retaining key 44 and the retaining key 54 from the straddling position to the storage position has been described, but the present invention is not limited to this.

For example, as shown in FIGS. 13 and 14, the recess 47 is provided with an undercut shape portion 61 to which a hook-shaped member 60 as a pull-back member for pulling back the retaining key 44 from the straddling position to the storage position can be engaged. You may.

As shown in FIG. 13, the hook-shaped member 60 is a rod-shaped member whose tip portion is formed wide in one direction orthogonal to its axis. The recess 47 has an undercut-shaped portion 61 composed of a passage corresponding to a wide tip portion and a space expanding in the back of the passage, and as shown in FIG. 14, the hook-shaped member 60 is inserted into the recess 47 and 90. By turning it many times, the wide tip portion engages with the undercut shape portion 61, whereby the retaining key 44 can be pulled back from the straddle position to the storage position.

Further, as shown in FIGS. 15 and 16, the hook-shaped member 62 can be configured to be wide in two directions in which the tip portion is orthogonal to the axis thereof, and in this case, the undercut shape portion 63 is also configured to be wide. It is configured in the corresponding shape. The configurations of the hook-shaped members 60 and 62 and the undercut shaped portions 61 and 63 can also be applied to the retaining key 54.

The number of rows of the inward groove portion 12 and the outward groove portion 22 provided in the mechanical joint J provided in the steel pipe pile P to be attached / detached according to the present invention is not limited to one. There may be two or more articles. Yatco Y may also have a plurality of inward groove portions 42 and outward groove portions 52 corresponding to these.

In the above-described embodiment, the outward reference surface 26 is provided so as to go around the outer peripheral surface 21, the inward reference surface 410 is provided so as to go around the inner peripheral surface 41, and the inward reference surface 16 is provided so as to go around the inner peripheral surface 41. Although the configuration described in which the outward reference surface 510 is provided so as to go around the surface 11 and the outward reference surface 510 is provided so as to go around the outer peripheral surface 51, the outward reference surface 26 is provided on a part of the periphery of the outer peripheral surface 21. The inward reference surface 410 is provided on a part of the periphery of the inner peripheral surface 41, the inward reference surface 16 is provided on a part of the periphery of the inner peripheral surface 11, and the outward reference surface 510 is provided on the outer peripheral surface 51. It may be configured to be provided in a part of the surroundings.

The mechanical joint J provided in the steel pipe pile P belonging to the series of steel pipe piles according to the present invention does not necessarily have to have the rotation restraint key 33.

Further, the mechanical joint J provided on the steel pipe pile, which is the object of attachment / detachment of the Yatco Y according to the present invention, is not limited to the configuration having the box joint 10 and the pin joint 20. For example, the mechanical joint J has a configuration in which pin joints are provided at both ends of the steel pipe S, and the pin joints are attached to each other and the periphery thereof is surrounded by a tubular joint composed of a plurality of divided bodies. You may. In this case, the inwardly convex portion does not have to be a pin joint or a load transmission key 30 configured separately from the tubular joint, but is a key portion integrally provided on the tubular joint. There may be. In the steel pipe pile having such a mechanical joint, the above-mentioned Yatco Y1 can be attached to and detached from the pin joint at either end of the steel pipe pile P.

In the above-described embodiment, the case where the YATCO Y is attached to and detached from the steel pipe pile P belonging to the series of steel pipe piles developed by differently at least one of the steel pipe diameter and the steel pipe thickness has been described. The Yatco Y can also be attached to and detached from the steel pipe sheet pile belonging to the series of steel pipe sheet piles developed by making at least one of them different.

In the above-described embodiment, the case where the steel pipe pile P, which is the object of attachment / detachment of the Yatco Y according to the present invention, is driven by the vibration method has been described, but the present invention is not limited to this. The Yatco Y according to the present invention can also be used when the steel pipe pile P is driven by a construction method such as a rotary method, a middle digging method and a pre-boring method.

The above-described embodiments are all examples of the present invention, and the description thereof does not limit the present invention, and the specific configuration of each part can be appropriately modified and designed within the range in which the effects of the present invention are exhibited. be.

10: Box joint 101: Box joint 11: Inner peripheral surface 12: Inward groove (inward recess)
13: Outer peripheral surface 14: Second notch recess 16: Inward reference surface (inward fitting surface)
20: Pin joint 201: Pin joint 21: Outer peripheral surface 22: Outward groove portion (outward concave portion)
23: Outer peripheral surface 24: No. 1 missing recess 26: Outward reference surface (outward fitting surface)
30: Load transmission key (inward convex part, outward convex part)
33: Rotation suppression key 40: Main body 41: Inner peripheral surface 410: Inward reference surface 42: Inward groove portion (inward concave portion)
43: Outer peripheral surface 44: Retraction key 45: Through hole (position fixing mechanism)
46: Ball plunger (position fixing mechanism)
47: Recess 48: Main body notch recess 49: Opening 50: Main body 51: Outer peripheral surface 510: Outward reference surface 52: Outward groove (outward recess)
53: Outer peripheral surface 54: Retraction key 55: Through hole (position fixing mechanism)
56: Ball plunger (position fixing mechanism)
57: Recess 58: Notch recess 59 of the main body: Opening C: Vibro chuck J: Mechanical joint P: Steel pipe pile S: Steel pipe Y: Yatko Y1: Yatko Y2: Yatko

Claims (6)

A series of steel pipe piles and steel pipe sheet piles developed with at least one of the steel pipe diameter and the steel pipe thickness different.
A mechanical joint having a size corresponding to the diameter of the steel pipe and the thickness of the steel pipe is provided at the end of the steel pipe.
The mechanical joint has a pin joint provided on one of the two steel pipes connected to each other and a box joint provided on the other steel pipe.
By engaging with the outward concave portion provided on the outer peripheral surface of the pin joint , an inward convex portion for preventing the pin joint and the box joint from being separated in the axial direction of the steel pipe is provided.
Wherein a portion of the outer peripheral surface of the pin joint, outward reference surface distance from the axis is set to a constant of the steel pipe irrespective of the steel pipe diameter and steel thickness of the steel pipe that the pin joint is provided is provided,
The inward convex portion is composed of a load transmission key arranged so as to straddle the outward concave portion and the inward concave portion provided on the inner peripheral surface of the box joint.
The outward reference surface is provided at a position different from the outward recess on the outer peripheral surface of the pin joint.
The distance from the axis of the steel pipe, regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe in which the box joint is provided, is the outward reference at a position different from the inward concave portion on the inner peripheral surface of the box joint. It has a group of steel pipe piles provided with an inward fitting surface set to be the same as the distance from the axis of the steel pipe on the surface.
The inward fitting surface is provided on the tip portion of the inner peripheral surface of the box joint.
The outward reference surface is a series of steel pipe piles and steel pipe sheet piles having a group of steel pipes constituting the outward fitting surface provided at a position facing the inward fitting surface on the outer peripheral surface of the pin joint. A yatco that belongs to the series of steel pipe piles and steel pipe sheet piles according to claim 1 and can be attached to and detached from pin joints provided in steel pipe groups having different steel pipe diameters or steel pipe thicknesses.
At least a main body portion that can surround the portion of the pin joint in which the outward recess is provided, and
A retaining key that can be placed at a straddling position straddling the inward recess provided at a position facing the outward recess on the inner peripheral surface of the main body and the outward recess provided on the pin joint. When,
Even in the case of the pin joint having a different outer diameter of the portion provided with the outward concave portion, a position fixing mechanism capable of fixing the retaining key at the straddling position is provided, and the pin joint is provided.
Yatco is provided with an inward reference surface that can be fitted to an outward reference surface provided on a part of the outer peripheral surface of the pin joint on the inner peripheral surface of the main body portion. A series of steel pipe piles and steel pipe sheet piles developed with at least one of the steel pipe diameter and the steel pipe thickness different.
A mechanical joint having a size corresponding to the diameter of the steel pipe and the thickness of the steel pipe is provided at the end of the steel pipe.
The mechanical joint has a first joint provided on one of the two steel pipes connected to each other and a second joint provided on the other steel pipe.
By engaging with the outward concave portion provided in the first joint, an inward convex portion for preventing the first joint and the second joint from being separated from each other in the axial direction of the steel pipe is provided.
An outward reference surface in which the distance from the axis of the steel pipe is set to be constant is provided on a part of the outer peripheral surface of the first joint regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe in which the first joint is provided. It is a yatko that belongs to the series of steel pipe piles and steel pipe sheet piles that have the steel pipe group that is attached to and detachable from the first joint provided in each steel pipe group that has different steel pipe diameters or steel pipe thicknesses.
At least the main body portion that can surround the portion of the first joint in which the outward recess is provided, and
A retaining position that can be placed at a straddling position straddling the inward recess provided at a position facing the outward recess on the inner peripheral surface of the main body and the outward recess provided on the first joint. With the key
Even in the first joint having a different outer diameter of the portion provided with the outward concave portion, a position fixing mechanism capable of fixing the retaining key at the straddling position is provided, and the first joint is provided.
Yatco is provided with an inward reference surface that can be fitted to an outward reference surface provided on a part of the outer peripheral surface of the first joint on the inner peripheral surface of the main body portion. A series of steel pipe piles and steel pipe sheet piles developed with at least one of the steel pipe diameter and the steel pipe thickness different.
A mechanical joint having a size corresponding to the diameter of the steel pipe and the thickness of the steel pipe is provided at the end of the steel pipe.
The mechanical joint has a pin joint provided on one of the two steel pipes connected to each other and a box joint provided on the other steel pipe.
By engaging with the inward concave portion provided on the inner peripheral surface of the box joint, an outward convex portion is provided to prevent the pin joint and the box joint from being separated in the axial direction of the steel pipe. ,
An inward reference surface in which the distance from the axis of the steel pipe is set to be constant is provided on a part of the inner peripheral surface of the box joint regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe to which the pin joint is provided. ,
The outward convex portion is composed of a load transmission key arranged so as to straddle the inward concave portion and the outward concave portion provided on the outer peripheral surface of the pin joint.
The inward reference surface is provided at a position different from the inward recess on the inner peripheral surface of the box joint.
The distance from the axis of the steel pipe is the inward reference surface regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe in which the pin joint is provided at a position different from the outward recess on the outer peripheral surface of the pin joint. Has a group of steel pipe piles provided with an outward fitting surface set to be the same as the distance from the axis of the steel pipe.
The inward reference surface constitutes an inward fitting surface provided at the tip portion of the inner peripheral surface of the box joint.
The outward fitting surface is a series of steel pipe piles and steel pipe sheet piles having a group of steel pipes provided at positions facing the inward fitting surface on the outer peripheral surface of the pin joint. A yatco that belongs to the series of steel pipe piles and steel pipe sheet piles according to claim 4 , and is detachable to a box joint provided in a steel pipe group having a different steel pipe diameter or at least one of the steel pipe thicknesses.
At least the main body portion that can be surrounded by the portion of the box joint provided with the inward concave portion, and
A retaining key that can be placed at a straddling position straddling the outward recess provided at a position facing the inward recess on the outer peripheral surface of the main body and the inward recess provided on the box joint. ,
A position fixing mechanism for fixing the retaining key to a straddling position straddling the outward recess and the inward recess even in the box joint having a different inner diameter of the portion provided with the inward recess. Is provided and
Yatco is provided with an outward reference surface that can be fitted to an inward reference surface provided on a part of the inner peripheral surface of the box joint on the outer peripheral surface of the main body portion. A series of steel pipe piles and steel pipe sheet piles developed with at least one of the steel pipe diameter and the steel pipe thickness different.
A mechanical joint having a size corresponding to the diameter of the steel pipe and the thickness of the steel pipe is provided at the end of the steel pipe.
The mechanical joint has a first joint provided on one of the two steel pipes connected to each other and a second joint provided on the other steel pipe.
By engaging with the inward concave portion provided in the second joint, an outward convex portion for preventing the first joint and the second joint from being separated in the axial direction of the steel pipe is provided, and at the same time, an outward convex portion is provided.
On a part of the inner peripheral surface of the second joint, an inward reference surface in which the distance from the axis of the steel pipe is set to be constant regardless of the steel pipe diameter and the steel pipe thickness of the steel pipe in which the first joint is provided is provided. It is a yatko that belongs to the series of steel pipe piles and steel pipe sheet piles having the provided steel pipe group, and is removable to the second joint provided in each steel pipe group having different steel pipe diameters or steel pipe thicknesses.
At least the main body portion that can be surrounded by the portion of the second joint provided with the inward recess.
A retaining key that can be placed at a straddling position straddling the outward recess provided at a position facing the inward recess on the outer peripheral surface of the main body and the inward recess provided in the second joint. When,
A position fixing mechanism for fixing the retaining key to a straddling position straddling the outward recess and the inward recess even in the second joint having a different inner diameter of the portion provided with the inward recess. , Is provided and
Yatco is provided with an outward reference surface that can be fitted to an inward reference surface provided on a part of the inner peripheral surface of the second joint on the outer peripheral surface of the main body portion.

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