Joint structure between steel pipe pile and building, and joint method between steel pipe pile and building

Abstract

To provide a junction structure between a steel pipe pile and a building, and a junction method between the steel pipe pile and the building, capable of joining the steel pipe pile and the building with excellent workability and improving the joint strength between the steel pipe pile and the building.SOLUTION: A junction structure 1 of the present invention allows junction to be constructed with excellent workability so as to form a filler 40 in a steel pipe pile P after a pipe body 12 of a junction member 10 covers the steel pipe pile P and a bar-like member 13 and a first reinforcement member 14 are inserted into the steel pipe pile P. A second reinforcement member 15 projecting from an inner wall of the steel pipe pile P, the bar-like member 13 of the junction member 10, and the first reinforcement member 14 are buried in the filler 40 in the steel pipe pile P, and the second reinforcement member 15 is placed at a position higher than that of the first reinforcement member 14, which allows resistance to stress upon drawing out a column C from the steel pipe pile P through creation of compressive force between the first reinforcement member 14 and the second reinforcement member 15, to improve the joint strength between the steel pipe pile and the building.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint structure and a joining method for joining a steel pipe pile to a building constructed on the steel pipe pile. [Background technology]

[0002] BACKGROUND ART Conventionally, a technique has been known in which steel pipe piles erected in the ground are joined to pillars of a building to support the building (see, for example, Patent Document 1). In this joining technique, a top plate is fixed to the top of a pile head cap device attached to the head of the steel pipe pile, and the steel pipe pile and the column are joined by fixing the column of the building to the top plate. By adjusting the position of the top plate fixed to the pile head cap device, it is possible to adjust the position between the steel pipe pile and the pillar of the building. In addition, with this joining technology, the closing plate provided on the pile head capping device is installed so that it drops into the pile head, and mortar or the like is filled above the closing plate to reinforce the pile head. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-169576 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the joining technology of Patent Document 1 mentioned above, there is a problem in that the joining work can take a long time because many bolts are used to attach the pile head cap device to the pile head and to fix the top plate to the pile head cap device. Furthermore, in the case of the joining technology of Patent Document 1, the head of the steel pipe pile is reinforced by filling it with mortar or the like, but this reinforcement does not improve the joining strength between the steel pipe pile and the column of the building.

[0005] The object of the present invention is to provide a joining structure between a steel pipe pile and a building, and a joining method between a steel pipe pile and a building, which can join the steel pipe pile and the building with good workability and improve the joining strength between the steel pipe pile and the building. [Means for solving the problem]

[0006] In order to achieve the above object, one invention of the present application is: A joint structure between a steel pipe pile and a building constructed on the steel pipe pile, a connecting member having a base plate, a pipe body fixed to the underside of the base plate, a rod-shaped member whose upper end is connected to the base plate and disposed so as to extend vertically within the pipe body, and a first reinforcing member disposed on the lower end side of the rod-shaped member, wherein the pipe body is placed over the head of the steel pipe pile, and the rod-shaped member and the first reinforcing member are inserted and installed within the steel pipe pile; An annular second reinforcing member provided on the inner wall of the steel pipe pile at a position above the first reinforcing member so as to extend toward the axis of the steel pipe pile; a joint plate to the upper surface of which a column of the building is fixed; Equipped with The base plate and the joining plate have elongated holes formed therein, the elongated holes extending in directions intersecting each other, the joining plate is disposed on the base plate such that the elongated hole of the joining plate partially overlaps with the elongated hole of the base plate, the joining member and the joining plate are fastened together by a fastening member that is connected to the elongated hole of the base plate and the elongated hole of the joining plate, A filler material filled with a fluid hardening material is provided at least between the first reinforcing member and the second reinforcing member in the steel pipe pile.

[0007] In a joining structure of this configuration, the joining member and the joining plate are stacked in a direction in which their long holes intersect (for example, perpendicular to each other) and are fastened together by fastening members that are connected to each long hole.This makes it possible to adjust the joining plate by moving it in a direction along each long hole, and by adjusting the position of the joining plate relative to the joining member, it is possible to adjust the position of the column relative to the steel pipe pile. By adjusting the position using crossed long holes (slots) in this way, it is relatively easy to adjust the position of the column relative to the steel pipe pile, so the steel pipe pile and the building (column) can be joined with good workability.

[0008] Furthermore, within the steel pipe pile in such a joint structure, a second reinforcing member is positioned above the first reinforcing member, and a filler material made of a fluid hardening material that has been filled and hardened is provided between the first and second reinforcing members.Therefore, even if, for example, a relatively large earthquake occurs and the pillar shakes violently, causing stress that would pull the pillar out of the steel pipe pile, the compressive force generated between the first and second reinforcing members will be able to resist the pulling force, making the joint less susceptible to damage from external forces such as earthquakes. Such a joint structure can improve the joint strength between the steel pipe pile and the building (column).

[0009] Also, preferably, The upper end of the rod-shaped member is attached to the base plate by screwing, and the first reinforcing member is attached to the lower end of the rod-shaped member by screwing. Specifically, male threads may be formed on the upper and lower ends of the rod-shaped member, and the rod-shaped member may be attached by nuts threaded onto the male threads.

[0010] The first reinforcing member is attached to the rod-shaped member by screwing, and its position can be adjusted up and down along the rod-shaped member by screwing the rod-shaped member forward and backward. The first reinforcing member can be moved up and down along the rod-shaped member to adjust the position of the first reinforcing member closer to the second reinforcing member or farther away from the second reinforcing member.Therefore, the vertical position of the first reinforcing member can be adjusted depending on the length that the head of the steel pipe pile protrudes from the ground and the position of the second reinforcing member provided on the inner wall of the steel pipe pile, and the like, thereby adjusting the position of the first reinforcing member relative to the second reinforcing member. Furthermore, the position of the first reinforcing member relative to the second reinforcing member can also be adjusted by adjusting the arrangement in which the upper end of the rod-shaped member is screwed to the base plate.

[0011] Also, preferably, the rod-shaped member is disposed along the axis of the tubular body, and the first reinforcing member is a disk member formed to be smaller in size than an imaginary circle inscribed in the second reinforcing member, The first reinforcing member is configured to be installed at a position vertically lower than the second reinforcing member by at least a dimension equivalent to the radius of the imaginary circle.

[0012] If the first reinforcing member is installed at a position vertically below the second reinforcing member by a dimension equivalent to the radius of an imaginary circle inscribed in the second reinforcing member, or by a dimension longer than the radius of that imaginary circle, a compressive force will be more effectively generated between the first reinforcing member and the second reinforcing member, making it possible to resist stress (pull-out force) that would pull the column out of the steel pipe pile, thereby further increasing the joint strength between the steel pipe pile and the building (column).

[0013] Also, preferably, The base plate of the connecting member is provided with a first through hole for filling the fluid hardening material into the steel pipe pile.

[0014] If a filler made by filling and hardening a fluid hardening material (a grout material such as mortar) into the steel pipe pile through the first through hole in the base plate is provided, the steel pipe pile is less likely to be damaged, such as deformed, even if the column shakes violently during a relatively large earthquake, causing bending stress to act on the head of the steel pipe pile, thereby further increasing the joint strength between the steel pipe pile and the building (column).

[0015] Also, preferably, The base plate of the joining member is provided with a second through hole for filling a fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile, A filler material formed by filling the fluid hardening material through the second through-hole is provided between the inner surface of the pipe body and the outer surface of the steel pipe pile.

[0016] If a filler made by filling and hardening a fluid hardening material (a grout material such as mortar) between the inner surface of the pipe body and the outer surface of the steel pipe pile through the second through hole in the base plate is provided, the steel pipe pile is less likely to be damaged, such as deformed, even if, for example, the column shakes violently and bending stress acts on the head of the steel pipe pile, thereby further increasing the joint strength between the steel pipe pile and the building (column).

[0017] Also, preferably, An annular member is arranged on the outer surface of the steel pipe pile, which abuts against the lower end of the pipe body or the inner surface of the pipe body to retain the fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile.

[0018] If a ring-shaped member is provided that is in close contact with the outer peripheral surface of the steel pipe pile and abuts against the lower end of the pipe body or the inner surface of the pipe body, a filler material made by hardening a fluid hardening material filled between the inner surface of the pipe body and the outer surface of the steel pipe pile can be suitably formed between the pipe body and the steel pipe pile.

[0019] Also, preferably, the second through hole of the base plate is provided at a position inscribed in the inner surface of the pipe body, The joining member is configured to be installed over the head of the steel pipe pile, with the guide member inserted into the second through hole and protruding below the lower end of the pipe body aligned along the outer surface of the steel pipe pile.

[0020] In this way, the joining member can be installed on the steel pipe pile so that the distance between the inner surface of the pipe body and the outer surface of the steel pipe pile is uniform around the entire circumference.

[0021] In addition, other inventions according to the present application include: A method for joining a steel pipe pile to a building for constructing the above-mentioned joint structure between a steel pipe pile and a building, wherein the base plate is provided with a first through hole for filling a fluid hardening material into the steel pipe pile and a second through hole for filling a fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile, the upper end side of the rod-shaped member is screwed to the base plate with a nut, and the first reinforcing member is screwed to the lower end side of the rod-shaped member, adjusting the first reinforcing member to a desired position according to the arrangement of the second reinforcing member; a step of placing the pipe body over the pile head of the steel pipe pile, inserting the rod-shaped member and the first reinforcing member into the steel pipe pile, and installing a connecting member on the steel pipe pile; A step of filling a fluid hardening material into the steel pipe pile through the first through hole; A step of filling a fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile through the second through hole; a step of fastening the base plate and the joining plate with the fastening member; It has been made to have.

[0022] With such a joining method, the first reinforcing member screwed onto the lower end of the rod-shaped member can be adjusted up and down along the rod-shaped member by screwing the rod-shaped member forward and backward.Therefore, the vertical position of the first reinforcing member can be adjusted depending on the length that the head of the steel pipe pile protrudes from the ground and the position of the second reinforcing member provided on the inner wall of the steel pipe pile, and the like, so that the position of the first reinforcing member relative to the second reinforcing member can be adjusted to the desired position.

[0023] Also, preferably, the rod-shaped member is disposed along the axis of the tubular body, and the first reinforcing member is a disk member formed to be smaller in size than an imaginary circle inscribed in the second reinforcing member, The first reinforcing member is adjusted so as to be disposed at a predetermined position that is vertically lower than the second reinforcing member by at least a dimension corresponding to the radius of the imaginary circle.

[0024] If the first reinforcing member is installed vertically below the second reinforcing member by a dimension equivalent to the radius of an imaginary circle inscribed in the second reinforcing member, or by a dimension longer than the radius of that imaginary circle, a compressive force will be more effectively generated between the first reinforcing member and the second reinforcing member, making it possible to resist stress (pull-out force) that would pull the column out of the steel pipe pile, thereby further increasing the joint strength between the steel pipe pile and the building (column).

[0025] Also, preferably, The method includes a step of providing a filler material made by solidifying the fluid hardening material filled into the steel pipe pile through the first through hole, and then tightening the rod-shaped member with the nut in a direction that brings the first reinforcing member closer to the base plate.

[0026] After providing a filler material made by solidifying a fluid hardening material filled inside the steel pipe pile, the rod-shaped member can be further tightened with a nut in a direction that brings the first reinforcing member closer to the base plate, thereby improving the fixation of the connecting member to the steel pipe pile. [Effects of the Invention]

[0027] According to the present invention, a steel pipe pile and a building can be joined with good workability, and the joining strength between the steel pipe pile and the building can be improved. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a cross-sectional view showing a joint structure between a steel pipe pile and a building (column) according to the present embodiment. FIG. [Figure 2] FIG. 1 is an exploded perspective view showing a joint structure between a steel pipe pile and a building (column) according to the present embodiment. [Figure 3] 10 is an explanatory diagram of a mode in which a base plate and a joining plate are fastened together by a fastening member. FIG. [Figure 4] 3 is an explanatory diagram relating to the arrangement of a first reinforcing member and a second reinforcing member in the joint structure of the present embodiment. FIG. [Figure 5] 1A and 1B are explanatory diagrams showing the process of constructing the joint structure of this embodiment. [Figure 6] FIG. 10 is an explanatory diagram of the procedure for covering the pipe body of the joint member onto the pile head of the steel pipe pile. [Figure 7] 1A and 1B are explanatory diagrams showing the process of constructing the joint structure of this embodiment. [Figure 8] 1A and 1B are explanatory diagrams showing the process of constructing the joint structure of this embodiment. [Figure 9] 1A and 1B are explanatory diagrams showing the process of constructing the joint structure of this embodiment. [Figure 10] 1A and 1B are explanatory diagrams showing the process of constructing the joint structure of this embodiment. [Figure 11] FIG. 10 is a cross-sectional view showing a modified example of the joint structure between a steel pipe pile and a building (column). DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, embodiments of a joining structure between a steel pipe pile and a building and a joining method between a steel pipe pile and a building according to the present invention will be described in detail with reference to the drawings. However, although the embodiments described below are subject to various technically preferable limitations for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

[0030] In this embodiment, a joint structure 1 between a steel pipe pile P and a building constructed on the steel pipe pile P, that is, a joint structure 1 between a steel pipe pile P and a column C of the building will be described. As shown in Figures 1 to 3, this joint structure 1 includes a base plate 11, a pipe body 12 fixed to the underside of the base plate 11, a connecting member 10 having a rod-shaped member 13 arranged on the base plate 11 so as to extend downward within the pipe body 12, a first reinforcing member 14 arranged on the lower end side of the rod-shaped member 13, a ring-shaped second reinforcing member 15 provided on the inner wall of the steel pipe pile P at a position above the first reinforcing member 14, a connecting plate 20 having a column C of a building fixed to its upper surface, a fastening member 30 fastening the base plate 11 and the connecting plate 20 together, and a filler 40 formed by filling the steel pipe pile P with a fluid hardening material.

[0031] The joint member 10 is installed on the steel pipe pile P with the pipe body 12 placed over the pile head of the steel pipe pile P and the rod-shaped member 13 and the first reinforcing member 14 inserted into the steel pipe pile P. The steel pipe pile P is driven into a recess U excavated in the ground, with the head of the steel pipe pile P located within the recess U. A filler 40 made by filling a fluid hardening material is also placed in the recess U of the ground. In addition, an annular member 50 is disposed on the outer peripheral surface of the steel pipe pile P. This annular member 50 abuts against the lower end of the pipe body 12 or the inner surface of the pipe body 12.

[0032] The second reinforcing member 15 is provided so as to protrude from the inner wall surface of the pile head of the steel pipe pile P toward the axis of the steel pipe pile P. The second reinforcing member 15 here is a donut-shaped, steel, annular member, and is provided so that the annular plate material projects toward the axis of the steel pipe pile P. The second reinforcing member 15 may be formed by applying a specified processing to a reinforcing material that has been previously installed on the inner wall of the steel pipe pile P to prevent the steel pipe pile P from being deformed by rotary pressing, or may be a new member that is fixed to the inner wall of the steel pipe pile P by welding or the like.

[0033] The joining member 10 is a member formed by welding a steel pipe body 12 to the lower surface of a steel base plate 11. For example, a doughnut-shaped steel plate inscribed on the inner surface of the pipe body 12 is used as a backing metal, and the pipe body 12 is fixed to the base plate 11 by welding. The pipe body 12 of the joint member 10 has a size that allows it to be placed over the head of the steel pipe pile P with a gap between them. In other words, the inner diameter of the pipe body 12 is larger than the outer diameter of the steel pipe pile P, and the pipe body 12 is placed over the pile head with a gap of, for example, about 1 cm to several tens of cm between the inner surface of the pipe body 12 and the outer surface of the steel pipe pile P.

[0034] A rod-shaped member 13 having a first reinforcing member 14 attached thereto is disposed on a base plate 11 of the joining member 10. The rod-shaped member 13 is, for example, a fully threaded bolt, and its upper end is attached to the base plate 11 by screwing, and the first reinforcing member 14 is attached to the lower end of the rod-shaped member 13 by screwing. Specifically, the rod-shaped member 13 is arranged on the base plate 11 by a nut 13a screwed onto the upper end side of the rod-shaped member 13, and a first reinforcing member 14 sandwiched between a pair of nuts 13a screwed onto the lower end side of the rod-shaped member 13 is arranged on the lower end side of the rod-shaped member 13.

[0035] The first reinforcing member 14 is attached to the rod-shaped member 13 by screwing, and its position can be adjusted up and down along the rod-shaped member 13 by screwing the rod-shaped member 13 forward and backward. In other words, the first reinforcing member 14 can be moved up and down along the rod-shaped member 13 to adjust the position of the first reinforcing member 14 closer to the base plate 11 or the second reinforcing member 15, or farther away from the base plate 11 or the second reinforcing member 15. Furthermore, by adjusting the arrangement in which the upper end side of the rod-shaped member 13 is screwed to the base plate 11, the position of the first reinforcing member 14 relative to the second reinforcing member 15 can be adjusted, albeit slightly. In addition, the rod-shaped member 13 is not limited to being a fully threaded bolt, and may be a rod-shaped member having male threads formed on both the upper and lower ends of the rod-shaped member 13, as long as the position of the first reinforcing member 14 attached to the rod-shaped member 13 can be adjusted and the distance between the base plate 11 and the second reinforcing member 15 can be adjusted by a predetermined length.

[0036] Moreover, the rod-shaped member 13 attached to the base plate 11 is disposed along the axis of the pipe body 12 . Furthermore, the first reinforcing member 14 attached to the rod-shaped member 13 is a disk-shaped steel member formed to a size smaller than the imaginary circle inscribed in the annular second reinforcing member 15. In other words, the first reinforcing member 14 is formed to a size that allows it to pass through the inside of the ring of the second reinforcing member 15. As shown in Figure 4, the first reinforcing member 14 is installed at a position vertically lower than the second reinforcing member 15 (a predetermined position of the first reinforcing member 14) by at least a dimension equivalent to the radius r of an imaginary circle inscribed in the annular second reinforcing member 15. Here, the first reinforcing member 14 is installed at a position vertically below the second reinforcing member 15, by a dimension longer than the radius r of an imaginary circle inscribed in the annular second reinforcing member 15.

[0037] In addition, when the first reinforcing member 14 is installed at a position vertically lower than the second reinforcing member 15 by the dimension of the radius r of an imaginary circle inscribed in the annular second reinforcing member 15, the upper surface of the first reinforcing member 14 should be located 45° downward from the inner edge of the second reinforcing member 15 (depression angle α = 45°), as shown in Figure 4. In other words, it is sufficient that the first reinforcing member 14 is installed at a position where the depression angle α from the inner edge of the second reinforcing member 15 is 45° or more.

[0038] Further, the base plate 11 of the joining member 10 has four corners formed with elongated holes 11a (see FIGS. 2 and 3) extending in a predetermined direction. Further, first through holes 11b for filling the fluid hardening material into the steel pipe pile P are provided on the central side of the base plate 11. In this embodiment, four first through holes 11b (see FIG. 2) are provided at equal intervals in the circumferential direction. Furthermore, if multiple first through holes 11b are provided, when the fluid hardening material is filled through any one of the first through holes 11b, the air inside will escape through the other first through holes 11b, and the filling status of the fluid hardening material can be checked using the other first through holes 11b. Further, second through holes 11c are provided at positions toward the center of the base plate 11 and outside the first through holes 11b, for filling a fluid hardening material between the inner surface of the pipe body 12 and the outer surface of the steel pipe pile P. In this embodiment, four second through holes 11c (see FIG. 2) are provided at equal intervals in the circumferential direction. These second through holes 11c are provided at positions inscribed in the inner surface of the pipe body 12, and also pass through a doughnut-shaped steel plate on the underside of the base plate 11 that is inscribed in the inner surface of the pipe body 12. Furthermore, if multiple second through holes 11c are provided, when the fluid hardening material is filled through any one of the second through holes 11c, the air inside can be released through the other second through holes 11c, and the filling status of the fluid hardening material can be checked using the other second through holes 11c.

[0039] The steel pipe pile P is provided with a filler 40 formed by filling a fluid hardening material through the first through-hole 11b. In addition, a filler 40 made by filling a fluid hardening material through the second through-hole 11c is provided between the inner surface of the pipe body 12 and the outer surface of the steel pipe pile P. Here, a ring-shaped member 50 is provided, which has the function of preventing the fluid hardening material filled from the through-hole 11c from leaking out from between the pipe body 12 and the steel pipe pile P. The annular member 50 is a member made of an elastic material such as rubber, and is disposed in close contact with the outer circumferential surface of the steel pipe pile P and the inner surface of the pipe body 12 .

[0040] The joining plate 20 is a plate-like member made of steel, and has elongated holes 20a (see FIGS. 2 and 3) formed at its four corners, extending in a predetermined direction. 2 and 3, the joining plate 20 is placed on the base plate 11 with the long holes 20a of the joining plate 20 overlapping in a direction that intersects (specifically, orthogonal to) the long holes 11a of the base plate 11. At this time, the long holes 20a of the joining plate 20 and the long holes 11a of the base plate 11 intersect and partially overlap. The joining member 10 and the joining plate 20 are fastened together by a fastening member 30 that communicates with the elongated hole 11 a of the base plate 11 and the elongated hole 20 a of the joining plate 20 . In this way, the joining member 10 and the joining plate 20 are stacked in a direction that crosses each other's long holes (11a, 20a) and fastened together by fastening members 30 that are connected to each long hole, so that it is possible to adjust the position of the joining plate 20 relative to the joining member 10 by moving it in a direction along the long holes (11a, 20a). The fastening member 30 of this embodiment is composed of a bolt 31 and a nut 32 screwed onto the bolt 31.

[0041] Next, a procedure for constructing the joint structure 1 of this embodiment (a method for joining a steel pipe pile to a building) will be described.

[0042] First, as shown in FIG. 5(a), a steel pipe pile P is driven into a recess U formed in the ground by rotary press-fitting or the like. A second reinforcing member 15 is provided on the inner wall of the pile head of the steel pipe pile P placed in the recess U. Furthermore, a sealing material S is placed at a predetermined position inside the steel pipe pile P. This sealing material S is installed in close contact with the inner wall surface of the steel pipe pile P so as to seal the steel pipe pile P, in order to reliably fill the pile head of the steel pipe pile P with a fluid hardening material (grout material) such as mortar or concrete. In addition, an annular member 50 is disposed on the outer circumferential surface of the steel pipe pile P.

[0043] Next, the position of the second reinforcing member 15 provided on the inner wall of the steel pipe pile P placed in the recess U is measured, and a rod-shaped member 13 having a first reinforcing member 14 attached thereto, the position of which has been adjusted according to the position of the second reinforcing member 15, is attached to the base plate 11. Specifically, the position of the first reinforcing member 14 is adjusted and attached so that it is positioned vertically lower than the second reinforcing member 15 by at least an amount equivalent to the radius of an imaginary circle inscribed in the annular second reinforcing member 15. For example, the attachment position of the first reinforcing member 14 is marked on the lower end side of the rod-shaped member 13 to correspond to the measured position of the second reinforcing member 15, and the attachment position to the base plate 11 is marked on the upper end side of the rod-shaped member 13, and the first reinforcing member 14 is attached to the rod-shaped member 13, and the rod-shaped member 13 is attached to the base plate 11 according to the markings. In this way, as shown in Figure 5(b), a connecting member 10 is prepared which has a first reinforcing member 14 whose position is adjusted according to the position of the second reinforcing member 15 provided on the inner wall of the steel pipe pile P. Furthermore, the bolt 31 of the fastening member 30 is temporarily fastened with a nut 32 in the elongated hole 11 a of the base plate 11 of the joining member 10 .

[0044] Next, the pipe body 12 of the joint member 10 is installed so as to cover the pile head of the steel pipe pile P. 6, a guide member G is used that is inserted into the second through-hole 11c of the base plate 11 and has its tip protruding below the lower end of the tubular body 12. This guide member G is formed in a shape that prevents it from passing through the second through-hole 11c and falling. In addition, the fastening member 30 is not shown in FIG.

[0045] Then, as shown in Figures 7(a) and (b), the pipe body 12 of the connecting member 10 is placed over the head of the steel pipe pile P with the guide member G, which is inserted into the second through hole 11c of the base plate 11 and protrudes below the lower end of the pipe body 12, aligned along the outer surface of the steel pipe pile P. In this way, the joint member 10 can be installed on the steel pipe pile P so that the gap between the inner surface of the pipe body 12 and the outer surface of the steel pipe pile P is uniform over the entire circumference. Here, when the pipe body 12 is placed over the head of the steel pipe pile P, the rod-shaped member 13 and the first reinforcing member 14 are inserted into the steel pipe pile P. In this embodiment, four second through holes 11c are provided at equal intervals in the circumferential direction, and the guide member G is inserted into the second through holes 11c. However, even if three second through holes 11c are provided at equal intervals in the circumferential direction, and the guide member G is inserted into the second through holes 11c, the distance between the inner surface of the pipe body 12 and the outer surface of the pile P can be made uniform around the entire circumference. After the joint member 10 is installed on the head of the steel pipe pile P, the guide member G is removed from the second through hole 11c.

[0046] Next, as shown in Figure 8(a), a fluid hardening material (a grout material such as mortar) is injected into the steel pipe pile P through the first through hole 11b of the base plate 11 to fill it. Also, a fluid hardening material (a grout material such as mortar) is injected between the inner surface of the pipe body 12 and the outer surface of the steel pipe pile P through the second through hole 11c of the base plate 11 to fill it. At this time, the fluid hardening material overflows from the first through hole 11b and the second through hole 11c into which the fluid hardening material has not been injected, thereby confirming that the fluid hardening material has been filled inside. In addition, the fluid hardening material filled inside the steel pipe pile P and the fluid hardening material filled between the inner surface of the pipe body 12 and the outer surface of the steel pipe pile P may be the same material or different materials.

[0047] Next, as shown in FIG. 8(b), the fluid hardening material filled inside is solidified to form the filler 40. By forming hardened filler material 40 inside the steel pipe pile P and between the pipe body 12 and the steel pipe pile P, the connecting member 10 is fixed to the pile head of the steel pipe pile P. Then, after the hardened filler material 40 is placed inside the steel pipe pile P, the nuts 13 a are further tightened in a direction in which the first reinforcing member 14 and the rod-shaped member 13 are brought closer to the base plate 11 . In this way, by further tightening the nut 13a of the rod-shaped member 13 to which the first reinforcing member 14 is attached, tension can be applied, and the fixation of the connecting member 10 to the steel pipe pile P can be improved.

[0048] Next, as shown in FIG. 9( a ), a base mortar 41 , which is also called a manju mortar, is set on the base plate 11 . Before setting the base mortar 41, the bolt 31 of the fastening member 30 is moved along the elongated hole 11a of the base plate 11 to adjust the position of the bolt 31. The bolts 31 placed at predetermined positions are finally tightened with nuts 32 to fix the base plate 11 . Next, as shown in FIG. 9(b), the bolts 31 of the fastening members 30 are inserted into the elongated holes 20a of the joint plate 20, the joint plate 20 is placed on the base plate 11, and the column C is erected. The joint plate 20 is moved in a direction along the long hole 20a so as to adjust the position of the erected pillar C, thereby adjusting the positions of the joint plate 20 and the pillar C. Then, as shown in FIG. 10(a), the joining plate 20 arranged in a predetermined position is fastened to the base plate 11 of the joining member 10 by fastening members 30. That is, the joint plate 20 placed at a predetermined position is finally fastened with the bolts 31 and nuts 32 to be fixed to the joint member 10, and the column C is erected at a predetermined position.

[0049] Next, as shown in FIG. 10(b), the recess U in the ground is filled with a fluid hardening material such as mortar or concrete. The fluid hardening material is also filled between the base plate 11 and the joining plate 20, and further filled on the joining plate 20, until the recess U is filled with the fluid hardening material. The fluid hardening material filled in the recess U may be the same as or different from the fluid hardening material filled in the steel pipe pile P or the fluid hardening material filled between the inner surface of the pipe body 12 and the outer surface of the steel pipe pile P. Then, the fluid hardening material filled in the recess U is solidified to form the filler 40. When the hardened filler material 40 is formed in the recess U, the construction of the joint structure 1 shown in FIG. 1 is completed. By following this procedure, a joint structure 1 between a steel pipe pile P and a column C of a building can be constructed.

[0050] With such a joint structure 1, the pipe body 12 of the joint member 10 is placed over the head of the steel pipe pile P, and the rod-shaped member 13 and first reinforcing member 14 of the joint member 10 are inserted into the steel pipe pile P. After that, a fluid hardening material is filled into the steel pipe pile P and between the pipe body 12 and the steel pipe pile P to form a filler material 40, and the joint member 10 can be fixed to the steel pipe pile P. Therefore, compared to the joint work in the above-mentioned prior art (Patent Document 1), which uses many bolts to attach a pile head cap device to the head of the steel pipe pile, the joint member 10 can be installed on the steel pipe pile P with a simpler procedure. That is, the joint structure 1 of this embodiment allows for easy construction of the joint.

[0051] Furthermore, the connecting member 10 and the connecting plate 20 in this connecting structure 1 are stacked in a direction in which their long holes (11a, 20a) intersect (orthogonal), and are fastened together by fastening members 30 that are connected to each of the long holes. This makes it possible to adjust the connecting plate 20 by moving it in a direction along each of the long holes (11a, 20a), and by adjusting the position of the connecting plate 20 relative to the connecting member 10, the position of the column C relative to the steel pipe pile P can be adjusted. By performing the position adjustment using the intersecting long holes (11a, 20a) in this manner, it is relatively easy to adjust the position of the column C relative to the steel pipe pile P. In other words, the joint structure 1 of this embodiment allows for easy joint construction.

[0052] In particular, a filler 40 made by filling and hardening a fluid hardening material is provided inside the pile head of the steel pipe pile P, which is covered with the pipe body 12 of the connecting member 10.Therefore, even if the column C shakes violently during a relatively large earthquake, for example, and bending stress acts on the pile head of the steel pipe pile P, the steel pipe pile P is less likely to be damaged, such as deformed. In addition, the point where the connecting member 10 fixed to the pile head of the steel pipe pile P and the connecting plate 20 having the column C fixed to its upper surface are joined using a fastening member 30 is embedded in a recess U in the ground and solidified with a filler material 40, making the joint less susceptible to damage from external forces such as earthquakes. Furthermore, the fastening members 30 embedded in the filler 40 are less likely to rust and deteriorate. In other words, the joint structure 1 of this embodiment can improve the joint strength between the steel pipe pile P and the column C of the building.

[0053] Furthermore, the hardened filler material 40 provided inside the head of the steel pipe pile P is embedded with a second reinforcing member 15 that protrudes from the inner wall of the steel pipe pile P toward the axis of the steel pipe pile P, as well as the rod-shaped member 13 and the disk-shaped first reinforcing member 14 of the connecting member 10, and the second reinforcing member 15 is positioned above the first reinforcing member 14.Therefore, even if, for example, a relatively large earthquake occurs and column C shakes violently, causing stress that would pull column C out of the steel pipe pile P, the compressive force generated between the first reinforcing member 14 and the second reinforcing member 15 will be able to resist the pull-out force, making the joint less susceptible to damage from external forces such as earthquakes. In other words, the joint structure 1 of this embodiment can improve the joint strength between the steel pipe pile P and the column C of the building.

[0054] In the joint structure 1 of this embodiment, the first reinforcing member 14 is installed at a position vertically lower than the second reinforcing member 15 by a dimension longer than the radius r of an imaginary circle inscribed in the second reinforcing member 15. This corresponds to installing the first reinforcing member 14 at a position where the depression angle α from the inner edge of the second reinforcing member 15 is 45° or more. The inventors have discovered that by adjusting the positioning of the first reinforcing member 14 relative to the second reinforcing member 15 based on these dimensions and angles, a compressive force is more suitably generated between the first reinforcing member 14 and the second reinforcing member 15, and the column C can resist stress (pull-out force) that would cause it to be pulled out of the steel pipe pile P.

[0055] As described above, the joint structure 1 of this embodiment allows the steel pipe pile P and the column C of the building to be joined with good workability, and the joint strength between the steel pipe pile P and the column C of the building can be improved.

[0056] The present invention is not limited to the above embodiment. For example, as shown in FIG. 11, the second reinforcing member 15 provided on the inner wall surface of the pile head of the steel pipe pile P may be a ring-shaped member formed using round steel bars. This ring-shaped second reinforcing member 15 is made by forming a round steel into a ring shape to a size that will inscribe the inner wall of the steel pipe pile P, and then fixing it to the inner wall of the steel pipe pile P by welding or the like. The joining structure 1 between a steel pipe pile and a building may be provided with such a ring-shaped second reinforcing member 15. Of course, even in this joint structure 1, the first reinforcing member 14 is installed at a position vertically lower than the second reinforcing member 15 by a dimension equal to or longer than the radius of an imaginary circle inscribed in the second reinforcing member 15. In other words, the first reinforcing member 14 is installed at a position where the depression angle α from the inner edge of the second reinforcing member 15 is 45° or more.

[0057] The application of the present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the present invention. [Explanation of symbols]

[0058] 1 Joint structure 10 Joint material 11 Base plate 11a long hole 11b 1st through hole 11c 2nd through hole 12. Body 13 Rod-shaped member 13a Nut 14 First reinforcing member 15 Second reinforcing member 20 Joint plate 20a long hole 30 Fastening members 31 volts 32 Nut 40 Filler 41 Base Mortar 50 Annular member C Pillar (pillar of building) P steel pipe pile S sealing material U Depression in the ground G guide member

Claims

1. A joint structure between a steel pipe pile and a building constructed on the steel pipe pile, a connecting member having a base plate, a pipe body fixed to the underside of the base plate, a rod-shaped member whose upper end is connected to the base plate and disposed so as to extend vertically within the pipe body, and a first reinforcing member disposed on the lower end side of the rod-shaped member, wherein the pipe body is placed over the head of the steel pipe pile, and the rod-shaped member and the first reinforcing member are inserted and installed within the steel pipe pile; An annular second reinforcing member provided on the inner wall of the steel pipe pile at a position above the first reinforcing member so as to protrude toward the axis of the steel pipe pile; a joint plate to the upper surface of which a column of the building is fixed; Equipped with The base plate and the joining plate have elongated holes formed therein, the elongated holes extending in directions intersecting each other, the joining plate is disposed on the base plate such that the elongated hole of the joining plate partially overlaps with the elongated hole of the base plate, the joining member and the joining plate are fastened together by a fastening member that is connected to the elongated hole of the base plate and the elongated hole of the joining plate, A joint structure between a steel pipe pile and a building, characterized in that a filler material filled with a fluid hardening material is provided at least between the first reinforcing member and the second reinforcing member within the steel pipe pile.

2. The joint structure between a steel pipe pile and a building described in claim 1, characterized in that the upper end of the rod-shaped member is attached to the base plate by screwing, and the first reinforcing member is attached to the lower end of the rod-shaped member by screwing.

3. the rod-shaped member is disposed along an axial center of the tubular body, the first reinforcing member is a disk member formed to be smaller in size than an imaginary circle inscribed in the second reinforcing member, A joint structure between a steel pipe pile and a building as described in claim 1 or 2, characterized in that the first reinforcing member is configured to be installed at a position vertically lower than the second reinforcing member by at least an amount corresponding to the radius of the virtual circle.

4. A joint structure between a steel pipe pile and a building described in any one of claims 1 to 3, characterized in that the base plate of the joint member is provided with a first through hole for filling the fluid hardening material into the steel pipe pile.

5. The base plate of the connecting member is provided with a second through hole for filling a fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile, A joint structure between a steel pipe pile and a building described in any one of claims 1 to 4, characterized in that a filler material is provided between the inner surface of the pipe body and the outer surface of the steel pipe pile, the filler material being filled through the second through hole.

6. A joint structure between a steel pipe pile and a building as described in claim 5, characterized in that a ring-shaped member is arranged on the outer surface of the steel pipe pile, which abuts against the lower end of the pipe body or the inner surface of the pipe body and retains the fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile.

7. the second through hole of the base plate is provided at a position inscribed in the inner surface of the pipe body, The joining structure between a steel pipe pile and a building described in claim 5 or 6, characterized in that the joining member is configured to be installed by covering the head of the steel pipe pile with a guide member that is inserted into the second through hole and protrudes below the lower end of the pipe body, aligned along the outer surface of the steel pipe pile.

8. 2. A joining structure between a steel pipe pile and a building according to claim 1, wherein the base plate is provided with a first through hole for filling a fluid hardening material into the steel pipe pile and a second through hole for filling a fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile, the upper end side of the rod-shaped member is screwed to the base plate with a nut, and the first reinforcing member is screwed to the lower end side of the rod-shaped member. adjusting the first reinforcing member to a desired position according to the arrangement of the second reinforcing member; a step of placing the pipe body over the pile head of the steel pipe pile, inserting the rod-shaped member and the first reinforcing member into the steel pipe pile, and installing a connecting member on the steel pipe pile; A step of filling a fluid hardening material into the steel pipe pile through the first through hole; A step of filling a fluid hardening material between the inner surface of the pipe body and the outer surface of the steel pipe pile through the second through hole; a step of fastening the base plate and the joining plate with the fastening member; A method for joining a steel pipe pile to a building, comprising:

9. the rod-shaped member is disposed along an axial center of the tubular body, the first reinforcing member is a disk member formed to be smaller in size than an imaginary circle inscribed in the second reinforcing member, A method for joining a steel pipe pile to a building as described in claim 8, characterized in that the first reinforcing member is adjusted so that it is positioned at a predetermined position vertically below the second reinforcing member by at least an amount corresponding to the radius of the virtual circle.

10. A method for joining a steel pipe pile to a building as described in claim 8 or 9, characterized in that it includes a process of providing a filler material made by solidifying the fluid hardening material filled into the steel pipe pile through the first through hole, and then further tightening the rod-shaped member with the nut in a direction that brings the first reinforcing member closer to the base plate.

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