Rotary steel pipe pile construction jig and rotary steel pipe pile construction method

Abstract

To improve workability while making common a joint structure between steel pipe piles with each other and components, in a construction jig for connecting between a rotation steel pipe pile and a construction machine connected by a mechanical joint structure.SOLUTION: A construction jig of a rotation steel pipe pile is provided which includes: a body part which is formed of a steel pipe; an end plate which is joined to one end part of the body part, in which an engagement hole is formed at a portion corresponding to the inside of the body part, and which also includes a flange portion corresponding to the outside of the body part; an engagement member which is fitted in the engagement hole; and a locking member which is mounted on an upper surface of the engagement member, and is locked to the end plate or the body part at a peripheral edge part of the engagement hole.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a construction jig for a rotary steel pipe pile and a construction method for a rotary steel pipe pile. [Background technology]

[0002] Patent Document 1 describes a rotary pile joint structure including a pair of end plates fixed to the ends of a rotary pile made of steel pipe, and a shear resistance portion provided on each end plate to resist the rotary shear force of the rotary pile. A joint like this, which transmits the rotary shear force of the rotary pile primarily by mechanical means rather than welding, is also called a mechanical joint structure. This mechanical joint structure for rotary piles is advantageous in that it eliminates the need for on-site welding and simplifies the rotary pile construction process. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 111882 Summary of the Invention [Problem to be solved by the invention]

[0004] In the mechanical joint structure described above, if the joint structure between steel pipe piles and the joint structure between a construction machine installed on the ground and the steel pipe pile could be standardized, it would be advantageous in terms of reducing the number of parts, etc. However, while the steel pipe piles are connected to each other in a state where they are upright, the steel pipe piles are connected to the construction machine in a state where they are laid horizontally before being driven, so it is not necessarily easy to connect them with the same structure while ensuring workability.

[0005] Therefore, the present invention aims to provide a construction jig for rotary steel pipe piles and a construction method for rotary steel pipe piles that connect rotary steel pipe piles connected by a mechanical joint structure to a construction machine, which can standardize the joint structure and parts between steel pipe piles while also improving workability. [Means for solving the problem]

[0006] [1] A construction jig for a rotary steel pipe pile comprising: a main body made of a steel pipe; an end plate joined to one end of the main body, having an engagement hole formed in the part corresponding to the inside of the main body, and further including a flange part corresponding to the outside of the main body; an engagement member fitted into the engagement hole; and a locking member attached to the upper surface of the engagement member and locking to the end plate or the main body at the peripheral part of the engagement hole. [2] The locking member includes a sheath tube attached to the upper surface of the engaging member, and a steel rod inserted into the sheath tube and extending beyond the side of the engaging member to the outside. This is a construction jig for a rotary steel pipe pile described in [1]. [3] A construction jig for a rotary steel pipe pile as described in [2], in which an opening is formed in the main body portion so that the steel rod can be inserted along the upper surface of the engaging member fitted into the engaging hole. [4] A construction jig for a rotary steel pipe pile as described in [3], in which a nut is attached to the outside of the opening, and a bolt inserted into the opening is screwed onto the nut. [5] The tip of the bolt is formed into a spherical shape, and is a construction jig for a rotary steel pipe pile as described in [4]. [6] A construction jig for a rotary steel pipe pile described in any one of [3] to [5], in which the tip of the steel rod opposite the opening is formed into a spherical shape. [7] The locking member is attached to the upper surface of the engaging member and includes a plate-shaped member extending beyond the side of the engaging member to the outside. [1] A construction jig for a rotary steel pipe pile as described in [1]. [8] The locking member includes a hook-shaped member that protrudes from the upper surface of the engaging member and curves outward, in the construction jig for a rotary steel pipe pile described in [1]. [9] A construction jig for a rotary steel pipe pile described in [7] or [8], wherein the locking member is attached to the engaging member via a shaft portion that passes through the engaging member and is rotatable around the shaft portion.

[10] The construction jig described in [1], wherein openings are formed at two circumferential positions of the main body, through which a steel rod can be inserted parallel to the upper surface of the engaging member fitted into the engaging hole, and the engaging member includes a hanging piece attached to the upper surface of the engaging member, and the hanging piece and the steel rod inserted into the openings.

[11] A method for constructing a rotary steel pipe pile using a construction jig described in any one of [1] to

[10] , wherein a rotary steel pipe pile including a pile body and a pile side end plate joined to one end of the pile body, having a pile side engagement hole formed in a portion corresponding to the inside of the pile body, and further including a pile side flange portion corresponding to the outside of the pile body, is connected to the construction jig by fitting the engagement member into the pile side engagement hole and overlapping and fastening the pile side flange portion and the flange portion. [Effects of the Invention]

[0007] According to the above configuration, even if the steel pipe pile is placed horizontally before driving, the construction jig can be connected to the steel pipe pile while preventing the engaging member engaged with the end plate of the construction jig from falling out of the engaging hole. Therefore, the joint structure and parts between the steel pipe piles can be standardized, and workability can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an example of a mechanical joint structure of a rotary steel pipe pile. [Figure 2] FIG. 2 is a diagram showing an example of connecting a construction jig and a steel pipe pile using the same mechanical joint structure as that shown in FIG. 1. [Figure 3] 1 is a perspective view showing a connection structure between a construction jig for a steel pipe rotary pile and a steel pipe pile according to a first embodiment of the present invention. FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] 4 is a perspective view showing an engagement member in the example of FIG. 3. FIG. [Figure 6] FIG. 10 is a view showing a connection structure between a construction jig for a steel pipe rotary pile and a steel pipe pile according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a view showing a connection structure between a construction jig for a steel pipe rotary pile and a steel pipe pile according to a third embodiment of the present invention. [Figure 8] FIG. 10 is a view showing a connection structure between a construction jig for a steel pipe rotary pile and a steel pipe pile according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

[0010] FIG. 1 shows an example of a mechanical joint structure for a rotary steel pipe pile. In the illustrated example, a common engaging member 3 is fitted into an engaging hole 21A (the engaging hole on the end plate 2B side is not visible) formed on the inner side of the end plates 2A and 2B, which are joined to the ends of the steel pipe piles 1A and 1B, respectively. The flange portions of the end plates 2A and 2B, which are on the outer side of the pile bodies, are then overlapped and fastened using bolts 41 and nuts 42 inserted into bolt holes 22A and 22B. The engaging hole 21A, the engaging hole on the end plate 2B side, and the engaging member 3 have corresponding polygonal cross sections (hexagonal in the illustrated example). This allows the engaging hole and the engaging member 3 to mesh at the corners of the polygonal cross section, allowing torque to be transmitted between the steel pipe piles 1A and 1B by bearing pressure between their faces. In order to enable the above-described engagement, the flange portions of the end plates 2A, 2B are fastened together using the bolts 41 and nuts 42 in a loose manner that allows for slippage between the end plates 2A, 2B.

[0011] As shown in Figure 1(a), the specific connecting process involves fitting an engaging member 3 into an engaging hole 21A at the top end of a steel pipe pile 1A that has already been driven into the ground, and then placing the engaging member 3 on a stopper 23A provided on the inside of the steel pipe pile 1A to stabilize it. In this state, as shown in Figure 1(b), the bottom end of the steel pipe pile 1B is lowered from above and the engaging member 3 is also fitted into the engaging hole on the end plate 2B side. Furthermore, as shown in Figure 1(c), the flange portions of the end plates 2A and 2B are overlapped and fastened using bolts 41 and nuts 42.

[0012] FIG. 2 is a diagram showing an example of a case where a construction jig and a steel pipe pile are connected using the same structure as the mechanical joint structure shown in FIG. 1. Before being driven into the ground, a steel pipe pile 1 is placed horizontally on the ground via a stand 5 or the like. In this state, a construction jig 10, which has a protrusion 11 for connection to a construction machine and an end plate 12 joined to its end, is connected to the steel pipe pile 1 via an engaging member 3. However, even if an attempt is made to engage the engaging member 3 with engaging holes (not shown) formed in the end plate 2 joined to the end of the steel pipe pile 1 and the end plate 12 of the construction jig 10, because the steel pipe pile 1 is placed horizontally, the engaging member 3 fitted into the engaging hole cannot be placed on a stopper provided inside the steel pipe pile 1 and stabilized, as in the joint structure between steel pipe piles shown in FIG. 1. Therefore, the engaging member 3 must be supported by hand or with another jig until just before the flange portions of the end plates 2, 12 are overlapped, which not only lengthens the work time but also poses safety problems when the diameter of the steel pipe pile increases and the engaging member 3 becomes larger.

[0013] As described above, the engaging member 3 engages with the engaging hole formed in the end plate and transmits torque by the bearing pressure between the surfaces, so if the engaging member 3 is welded to the end plate 12 of the construction jig 10, for example, the weld strength will be insufficient to withstand the transmitted torque. Therefore, it is not appropriate to try to solve the above problem by welding the engaging member 3 to the end plate 12 of the construction jig 10 in advance.

[0014] FIG. 3 is a perspective view showing the connection structure between a steel pipe rotary pile installation jig and a steel pipe pile according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a perspective view showing the engagement member shown in FIG. 3. As shown in FIG. 3, the installation jig 10 according to this embodiment has a main body made of a steel pipe, a protrusion 11 protruding from the main body for connection to a construction machine, an end plate 12 joined to one end of the main body, an engagement member 3 fitted into an engagement hole 121 formed in the end plate 12, and a locking member (described later). The end plate 12 also has a bolt hole 122. Similar to the joint structure between steel pipe piles shown in FIG. 1, the engagement hole 121 is formed in the inner portion of the main body of the end plate 12, and the bolt hole 122 is formed in the flange portion of the end plate 12 that is located on the outer side of the main body. As shown in the figure, the construction jig 10 is connected to the steel pipe pile 1 by fitting the engaging member 3 into the engaging hole (not visible in Figure 3; see Figure 1) formed in the end plate 2 of the steel pipe pile 1, and then overlapping the flange portion of the end plate 12 with the flange portion of the end plate 2 of the steel pipe pile 1 and fastening them together with bolts 41 and nuts (not shown) inserted into bolt holes 122 and 22.

[0015] As shown in the cross-sectional view of FIG. 4 and the perspective view of the engaging member of FIG. 5, in this embodiment, the sheath tube 31 is joined to the upper surface 3A of the engaging member 3. The upper surface 3A refers to one of the surfaces of the engaging member 3 other than the side surfaces (the surfaces that form each side of the polygonal cross section and contact the engaging hole), and does not necessarily mean that the surface always faces upward. The upper surface 3A faces the main body of the construction jig 10 when the engaging member 3 is fitted into the engaging hole 121. As shown in FIG. 4, with the engaging member 3 fitted into the engaging hole 121, the round steel rod 32 is inserted into the sheath tube 31 along the upper surface 3A. Because the length of the round steel rod 32 is longer than the outer diameter of the engaging member 3 and the engaging hole 121, the round steel rod 32 extends beyond the side surfaces of the engaging member 3 and both ends are engaged with the end plates 12 at the peripheries of the engaging hole 121. This prevents the engaging member 3 from falling off the engaging hole 121 of the end plate 12, even when the steel pipe pile 1 and the construction jig 10 are placed horizontally as shown in FIG.

[0016] In this embodiment, the sheath tube 31 and the round steel rod 32 constitute a locking member that is attached to the upper surface 3A of the engaging member 3 and is locked to the end plate 12 at the periphery of the engaging hole 121. The cross section of the sheath tube 31 is not limited to being circular, and may be triangular, rectangular, or any other polygonal shape. When the cross section of the sheath tube 31 is not circular, the steel rod to be inserted need not be a round steel rod, but may instead be a steel rod with a cross section that matches the cross section of the sheath tube 31, such as a triangular, rectangular, or other polygonal shape.

[0017] As shown in the cross-sectional view of FIG. 4 , the main body of the construction jig 10, made of a steel pipe, has an opening 13 formed therein through which a round steel rod 32 can be inserted along the upper surface 3A of the engaging member 3 fitted into the engaging hole 121. After the round steel rod 32 is inserted through the opening 13, a bolt 15 is threaded into a nut 14 joined to the main body outside the opening 13. The bolt 15 penetrates the nut 14 and into the opening 13, contacts the round steel rod 32, and then returns by a predetermined clearance (e.g., 3 mm). This prevents the round steel rod 32 from falling out, maintaining the state in which the engaging member 3 is engaged with the end plate 12, and also ensures a predetermined clearance so that torque can be transmitted between the engaging member 3 and the engaging hole 121 by bearing pressure between their surfaces. This prevents excessive stress from acting on the round steel rod 32 and the bolt 15.

[0018] In the illustrated example, the tip of the round steel rod 32 (the end opposite the bolt 15) and the tip of the bolt 15 are formed spherically to ensure reliable contact between the round steel rod 32 and the inner surface of the main body of the construction jig 10, which is made of a steel pipe, as well as reliable contact between the tip of the bolt 15 and the end face of the round steel rod 32 and to ensure accurate clearance.

[0019] In the above example, the sheath tube 31 does not protrude beyond the side surface of the engaging member 3 and does not interfere with the engaging hole 121. Therefore, during installation, the engaging member 3 is fitted into the engaging hole 121 from the outside of the end plate 12, and then the round steel rod 32 is inserted into the sheath tube 31 through the opening 13 so that the engaging member 3 can be locked to the end plate 12. In other examples, for example, the round steel rod 32 may be inserted into the sheath tube 31 from the beginning, or a steel rod that protrudes beyond the side surface of the engaging member 3 may be attached to the upper surface 3A of the engaging member 3 instead of the sheath tube 31. In these cases, the engaging member 3 is inserted from the end of the construction jig 10 opposite the end plate 12 and fitted into the engaging hole 121.

[0020] 6 is a diagram showing a connection structure between a construction jig for a steel pipe rotary pile and a steel pipe pile according to a second embodiment of the present invention. In the illustrated example, a plate-like member 33 attached to the upper surface 3A of the engaging member 3 and extending beyond the side surface of the engaging member 3 constitutes a locking member that is locked to the end plate 12 at the peripheral portion of the engaging hole 121.

[0021] In the illustrated example, plate-shaped member 33 is attached to engaging member 3 via shaft 34 that penetrates engaging member 3, and is rotatable about shaft 34. The rotational position of plate-shaped member 33 is fixed by tightening nut 35 that threads onto shaft 34 on the surface opposite top surface 3A. In this case, engaging member 3 is fitted into engaging hole 121 from the outside of end plate 12 while rotated inward from the side surface of engaging member 3 so that plate-shaped member 33 does not interfere with engaging hole 121, and then plate-shaped member 33 can be rotated about shaft 34 to engage with end plate 12.

[0022] 7 is a diagram showing a connection structure between a construction jig for a steel pipe rotary pile and a steel pipe pile according to a third embodiment of the present invention. In the illustrated example, a hook-shaped member 36 protruding from the upper surface 3A of the engaging member 3 and curving outward constitutes a locking member that is locked to the end plate 12 at the periphery of the engaging hole 121. The hook-shaped member 36 protrudes from the upper surface 3A and curves outward by approximately 180°, with its tip coming into contact with the end plate 12.

[0023] In the illustrated example, the hook-shaped member 36 includes a shaft that penetrates the engagement member 3 and extends to the surface opposite the upper surface 3A, and is rotatable about the shaft. The rotational position of the hook-shaped member 36 is fixed by tightening a nut 37 that threads onto the shaft. In this case, the engagement member 3 is rotated inward from the side surface of the engagement member 3 so that the hook-shaped member 36 does not interfere with the engagement hole 121, and then the engagement member 3 is fitted into the engagement hole 121 from the outside of the end plate 12, and the hook-shaped member 36 can then be rotated about the shaft to engage with the end plate 12.

[0024] In the above-described example, the plate-like member 33 and the hook-like member 36 may not be rotatable around the shaft, but may be fixed to the engaging member 3. In this case, the engaging member 3 is inserted from the end of the construction jig 10 opposite the end plate 12 and fitted into the engaging hole 121. The plate-like member 33 and the hook-like member 36 do not necessarily have to be attached via a shaft that passes through the engaging member 3, and may be welded to the upper surface 3A of the engaging member 3, for example.

[0025] 8 is a diagram showing a connection structure between a construction jig for a steel pipe rotary pile and a steel pipe pile according to a fourth embodiment of the present invention. In the first to third embodiments described above, the locking member attached to the upper surface of the engaging member 3 is locked to the end plate 12 at the peripheral portion of the engaging hole 121, whereas in the fourth embodiment, the locking member is locked to the main body of the construction jig 10. Specifically, openings 16A and 16B are formed at two locations in the circumferential direction of the main body made of a steel pipe of the construction jig 10. More specifically, openings 16A and 16B are formed at two locations on the diameter of the cross-sectional circumference of the steel pipe of the main body.

[0026] Meanwhile, a hanging piece 38 is joined to the upper surface 3A of the engaging member 3. The hanging piece 38 is, for example, a frame-shaped member as shown in the figure, but is not limited to this example. In the illustrated example, the hanging piece 38 is joined to two locations on the upper surface 3A of the engaging member 3, but it may be joined to one location or three or more locations. The engaging member 3 is locked to the main body of the construction jig 10 by inserting a round steel rod 39 through the hanging piece 38 and the openings 16A and 16B. For example, by previously joining an end plate 39A to one end of the round steel rod 39 and screwing a nut 39B onto the other end, the round steel rod 39 can be inserted through the hanging piece 38 and the openings 16A and 16B, and the engaging member 3 can be maintained locked.

[0027] The inserted member is not limited to the round steel rod 39; for example, a steel rod with a triangular, rectangular, or other polygonal cross section may be used. By inserting the round steel rod 39 into the hanging piece 38 with a gap at least in the horizontal direction, the horizontal movement of the engaging member 3 is not hindered, and the engaging member 3 engages with the engaging hole 121 of the end plate 12, maintaining a state in which torque is transmitted by the bearing pressure between the surfaces. Therefore, the inner shape of the hanging piece 38 does not necessarily correspond to the shape of the inserted member. For example, as in the illustrated example, the round steel rod 39 may be inserted into a rectangular hanging piece 38. Alternatively, even if there is no gap between the hanging piece 38 and the round steel rod 39, the state in which torque is transmitted by the bearing pressure can be maintained as described above as long as the round steel rod 39 is inserted into the openings 16A and 16B of the main body with a gap.

[0028] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications or alterations within the scope of the technical idea described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention. [Explanation of symbols]

[0029] 1,1A,1B...steel pipe pile, 2,2A,2B...end plate, 21A...engagement hole, 22,22A,22B...bolt hole, 23A...stopper, 3...engagement member, 3A...upper surface, 5...base, 10...construction jig, 11...protrusion, 12...end plate, 121...engagement hole, 122...bolt hole, 13...opening, 14...nut, 15...bolt, 16A,16B...opening, 31...sheath tube, 32...round steel bar, 33...plate-shaped member, 34...shaft, 35,37...nut, 36...hook-shaped member, 38...hanging piece, 39...round steel bar, 39A...end plate, 39B...nut, 41...bolt, 42...nut.

Claims

1. a main body made of a steel pipe; an end plate joined to one end of the main body portion, with an engagement hole formed in a portion corresponding to the inside of the main body portion, and further including a flange portion corresponding to the outside of the main body portion; an engaging member fitted into the engaging hole; a locking member attached to an upper surface of the engaging member and locked to the end plate or the main body at a peripheral portion of the engaging hole; A rotary steel pipe pile construction jig equipped with:

2. 2. The rotary steel pipe pile construction jig according to claim 1, wherein the locking member includes a sheath tube attached to the upper surface of the engaging member, and a steel rod inserted into the sheath tube and extending beyond the side of the engaging member to the outside.

3. 3. The rotary steel pipe pile construction jig according to claim 2, wherein the main body portion has an opening through which the steel rod can be inserted along an upper surface of the engaging member fitted into the engaging hole.

4. 4. The rotary steel pipe pile installation jig according to claim 3, wherein a nut is attached to the outside of the opening, and a bolt inserted into the opening is screwed onto the nut.

5. 5. The installation jig for a rotary steel pipe pile according to claim 4, wherein the tip of the bolt is formed into a spherical shape.

6. The rotary steel pipe pile installation jig according to any one of claims 3 to 5, wherein the tip of the steel rod opposite to the opening is formed into a spherical shape.

7. The rotary steel pipe pile installation jig according to claim 1 , wherein the locking member includes a plate-like member attached to an upper surface of the engaging member and extending outward beyond a side surface of the engaging member.

8. The rotary steel pipe pile installation jig according to claim 1 , wherein the locking member includes a hook-shaped member that protrudes from an upper surface of the engaging member and curves outward.

9. 9. The rotary steel pipe pile installation jig according to claim 7, wherein the locking member is attached to the engaging member via a shaft portion that passes through the engaging member and is rotatable around the shaft portion.

10. At two positions in the circumferential direction of the main body, openings are formed through which steel rods can be inserted parallel to the upper surface of the engaging member fitted into the engaging hole, 2. The rotary steel pipe pile construction jig according to claim 1, wherein the locking member includes a hanging piece attached to an upper surface of the engaging member, and the steel rod inserted through the hanging piece and the opening.

11. A method for constructing a rotary steel pipe pile using the construction jig according to any one of claims 1 to 10, A pile body; a pile-side end plate joined to one end of the pile body, having a pile-side engagement hole formed in a portion corresponding to the inside of the pile body, and further including a pile-side flange portion corresponding to the outside of the pile body; A method for constructing a rotary steel pipe pile, comprising: fitting the engaging member into the pile-side engaging hole; overlapping and fastening the pile-side flange portion and the flange portion; and connecting the rotary steel pipe pile to the construction jig.

Images