Joint structure between piles and superstructure

Abstract

To provide a joint structure for joining a pile and a structure above it, which shortens construction time, ensures high construction precision and quality, and absorbs displacement from a designed pile core.MEANS: A joining structure between a pile and an upper structure is formed from a joining inner tube which is cylindrical and has approximately the same diameter as an outer diameter of a pile to be embedded and has columnar arms removably attached to its peripheral wall surface at equal intervals from the same circumference toward the outside, and a joining outer tube which is cylindrical and has an inner diameter larger than an outer diameter of the joining inner tube and has long horizontal through holes on its side face through which the arms of the joining inner tube can slide, and has an inner tube fixing bolt screwed in an axial center direction at a midpoint between a pair of neighboring long horizontal through holes. By appropriately increasing or decreasing an amount of threading of the inner tube fixing bolt to fix the joining inner tube, it is possible to absorb displacement between a designed axial center and a core of the pile actually embedded.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] This invention relates to a joint structure between a buried pile and a superstructure to be installed on top of the pile, and more specifically to a joint structure between a pile and a superstructure that minimizes tedious work at the construction site, improves construction accuracy, and shortens construction time. [Background technology]

[0002] Foundations for various types of buildings play an important role in transferring the load acting on the superstructure to the foundation ground. Foundations are generally constructed using cast-in-place reinforced concrete, but pile foundations are also commonly used, in which pre-fabricated piles are brought to the site and driven or buried into the ground.

[0003] This pile foundation uses piles manufactured in a factory with strict quality control, so compared to other foundation construction methods, quality control is easier, there is less on-site work required, and construction time can be shortened, making it suitable for work in urban areas with heavy traffic and where work hours tend to be limited. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2004-183266 [Non-patent literature]

[0005] [Non-Patent Document 1] none Summary of the Invention [Problem to be solved by the invention]

[0006] In this pile foundation, it is necessary to connect the head of the pile to the superstructure that will be installed on top of the pile, and a connecting plate fixed to the head of the pile is connected to the lower end of the superstructure using connecting hardware such as bolts and nuts.

[0007] However, in many surface layers of the ground, there are obstacles such as rubble embedded in the ground, and when burying piles, these obstacles get in the way, making it impossible to bury the piles vertically in the designed position. This can result in a slight deviation between the designed pile core and the pile core of the pile that is actually buried, making it impossible for the piles to reliably absorb the load from the superstructure.

[0008] For this reason, as shown in Patent Document 1, an adjustment member is placed between the pile head and the lower end of the superstructure, thereby absorbing the discrepancy between the designed pile core and the pile core of the pile that is actually buried. However, the work of fixing this adjustment member to the pile head is all done at the construction site, which makes it difficult to ensure construction accuracy and quality, and requires a lot of work time.

[0009] As a result of intensive research conducted by the inventors to solve the above problems with pile foundations, they have succeeded in developing a joint structure between a pile and a superstructure that effectively absorbs the discrepancy between the designed pile core and the actually buried pile core, thereby minimizing tedious work at the construction site, ensuring high construction accuracy and quality, and shortening work time. This joint structure is proposed here as the present invention. [Means for solving the problem]

[0010] In a joint structure between a buried pile and a superstructure to be installed on top of the pile, the above-mentioned problem was solved by configuring the joint structure between the pile and the superstructure from an inner joint tube that is cylindrical and has approximately the same diameter as the outer diameter of the pile, and has three or more cylindrical arms detachably attached to its peripheral wall surface at equal intervals radially outward from the same circumference, and an outer joint tube that is cylindrical and has an inner diameter larger than the outer diameter of the inner joint tube, and has horizontally elongated through holes formed on its side at the same intervals as the arms of the inner joint tube, with a vertical width that allows the arms of the inner joint tube to slide circumferentially, and the holes are threaded axially at the middle positions between each pair of adjacent horizontally elongated through holes, and bolts for fixing the inner tube are screwed into the threaded holes. [Effects of the Invention]

[0011] After the pile, which has the connecting inner tube with the arm removed and previously fixed to the head, is buried in the construction ground to a predetermined depth, the connecting outer tube is placed over the outside of the connecting inner tube at the head of the pile, and the arm is fixed to the peripheral wall surface of the connecting inner tube through the horizontally long through-hole of the connecting outer tube, and then the connecting plate at the upper end of the connecting outer tube is joined to the lower end of the superstructure, and the position of the connecting inner tube inside the connecting outer tube is fixed by appropriately increasing or decreasing the amount of screwing in of the inner tube fixing bolt attached to the connecting outer tube. The pile is joined to the superstructure using a tube and an outer connecting tube, and at the construction site, the pile can be joined to the superstructure simply by attaching the outer connecting tube to the inner connecting tube fixed to the head of the pile.This improves construction accuracy and quality and reduces work time, and the combination of the inner connecting tube and outer connecting tube absorbs any discrepancy between the designed axis and the core of the actually buried pile, allowing the load acting on the superstructure to be stably transmitted to the buried pile. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view of an embodiment of a joint structure between a pile and a superstructure according to the present invention; [Figure 2] Also, a longitudinal cross-sectional view thereof. [Figure 3] Similarly, the perspective view [Figure 4] FIG. 10 is an exploded perspective view of the main components separated. [Figure 5] FIG. 10 is a perspective view of the connecting outer cylinder, which is a main structural part, seen from below. [Figure 6] 6 is a cross-sectional view of the joining outer cylinder taken along the line AA in FIG. 5. [Figure 7] FIG. 10 is a perspective view of the connecting inner tube fixed to the head of the pile. [Figure 8] FIG. [Figure 9] 9 is a cross-sectional view taken along the line BB in FIG. 8, illustrating the attachment of the arm member to the connecting inner tube. [Figure 10]FIG. 10 is a cross-sectional view of another example of a means for forming an arm member in a joining inner tube. [Figure 11] A cross-sectional view showing the state when the designed pile core X and the axis center Y of the actually buried pile are misaligned when the connecting inner tube and the connecting outer tube are connected. [Figure 12] Similarly, this is a cross-sectional view showing the state in which the design axis X and the axis Y of the actually buried pile are aligned by adjusting the inner tube fixing bolts, and the connecting inner tube is fixed. DETAILED DESCRIPTION OF THE INVENTION

[0013] When joining a buried pile to a superstructure to be installed on top of it, the joint structure is made up of an inner connecting tube, which is cylindrical with a diameter approximately the same as the outer diameter of the pile and has three or more cylindrical arms detachably attached to its peripheral wall at equal intervals radially outward from the same circumference, and an outer connecting tube, which is cylindrical with an inner diameter larger than the outer diameter of the inner connecting tube and has long horizontal through holes on its side that are spaced the same distance apart from each other and have a vertical width that allows the arms of the inner connecting tube to slide circumferentially, and has screw holes formed in the middle of each pair of adjacent long horizontal through holes toward the axial center, and bolts for fixing the inner tube are screwed into the screw holes.The greatest feature of this joint structure is that by combining this outer connecting tube and inner connecting tube, it is possible to absorb any discrepancy between the designed axial center and the center of the actual buried pile. [Example]

[0014] An embodiment of a joint structure between a pile and a superstructure according to the present invention will be described with reference to the drawings.

[0015] In the figure, 1 is a pile that is buried at a construction site as the foundation work for various structures. In this example, a rotary penetration steel pipe pile is used, but as long as it is a pre-bored buried pile, it is not limited to a steel pipe pile, and materials other than steel pipe can also be used.

[0016] 6 and 7, a connecting inner tube 11 made of a cylindrical steel pipe and having an outer diameter approximately the same as that of the pile 1 is fixed to the upper end of the pile 1, i.e., the pile head. When the pile 1 is a steel pipe pile, the connecting inner tube 11 is generally fixed to the pile head by welding, but when the pile 1 is a concrete pile or the like, a fixing method other than welding is used. The work of fixing the joining inner tube 11 to the head of the pile 1 is carried out in advance not at the construction site but at a factory separate from the construction site, and the pile 1 is transported to the construction site with the joining inner tube 11 already fixed to the head of the pile 1.

[0017] Four cylindrical arms 3 are detachably attached to the peripheral wall of the connecting inner cylinder 11 at equal intervals, radially outward from the same circumference.

[0018] In this embodiment, four arm members 3 are attached, but this is not necessarily limited to four, and the number is not limited as long as three or more are attached at equal intervals. It is essential that the arm member 3 is attached detachably. In this embodiment, as shown in FIG. 9, a cylindrical recess 20 with an inner diameter slightly larger than the outer diameter of the arm member 3 is formed in the peripheral wall of the connecting inner tube 11. A female screw 4 is formed concentrically from the center of the bottom surface of this recess 20 toward the inner diameter side, and a male screw 8 is protruded along the axis from the center of one end surface of the cylindrical arm member 3. The arm member 3 is inserted into the recess 20 and the male screw 8 is screwed into the female screw 4, thereby attaching the arm member 3 to the connecting inner tube 11. It is designed to be attached and detached freely to the peripheral wall surface, but if the thickness of the connecting inner tube 11 is thin, as shown in Figure 10, a through hole 21 with an inner diameter slightly larger than the outer diameter of the arm member 3 can be formed in the peripheral wall of the connecting inner tube 11, and a plate-shaped body 22 with an internal thread 4 formed in the center can be fixed to the inner wall surface of the connecting inner tube 11 so that the internal thread 4 is concentric with the through hole 27, and the external thread 8 of the arm member 3 can be screwed into the internal thread 4 of the plate-shaped body 22 to fix the arm member 3 to the peripheral wall of the connecting inner tube 11.

[0019] Furthermore, in the figure, reference numeral 17 denotes a steel pipe outer tube for connection, which has an inner diameter D larger than the outer diameter C of the inner tube for connection 11, and on the side thereof, horizontally elongated through holes 12 having an up and down width that allows the arm members 3 to slide circumferentially are formed at equal intervals on the same circumference at the same intervals as the arm members 3 of the inner tube for connection 11, and screw holes 13 are drilled at the midpoints of each of a pair of adjacent horizontally elongated arm members 3.

[0020] As mentioned above, the inner diameter D of the joining outer cylinder 17 is larger than the outer diameter C of the joining inner cylinder 11. This is to allow the axis of the joining inner cylinder 11 to be moved as necessary when the joining inner cylinder 11 is positioned inside the joining outer cylinder 17. In this embodiment, the inner diameter D of the joining outer cylinder 17 is approximately 1.3 times the outer diameter C of the joining inner cylinder 11.

[0021] Also, in the figure, reference numeral 14 denotes a bolt for fixing the inner cylinder, which is adapted to be screwed into a threaded hole 13 drilled in the outer joining cylinder 17 .

[0022] This embodiment has the above-mentioned configuration, and as shown in Figures 7 and 8, the pile 1, with the connecting inner tube 11 having the arm member 3 removed and previously fixed to its head, is buried in the construction ground to a predetermined depth, and then, as shown in Figure 11, the connecting outer tube 17 is placed over the outside of the connecting inner tube 11 at the head of the pile 1, and the arm member 3 is fixed to the peripheral wall surface of the connecting inner tube 11 through the horizontally long through hole 12 of the connecting outer tube 17. After that, the connecting plate 16 at the upper end of the connecting outer tube 17 and the connecting plate 18 attached to the superstructure 2 are connected with bolts / nuts 19, and the position of the connecting inner tube 11 inside the connecting outer tube 17 is fixed by appropriately increasing or decreasing the amount of threading of the inner tube fixing bolt 14 attached to the connecting outer tube 17, and the pile and superstructure are joined together by the connecting inner tube 11 and the connecting outer tube 17. At the construction site, the pile 1 is joined to the superstructure 2 simply by attaching the connecting outer tube 17 to the connecting inner tube 11 fixed to the head of the pile 1, and the combination of the connecting inner tube 11 and the connecting outer tube 17 absorbs any discrepancy between the designed axis and the core of the pile that is actually buried.

[0023] Furthermore, a height adjustment plate may be sandwiched between the joining plates 16 and 17 as needed, and the joining plate 18 at the lower end of the upper structure 2 may be omitted and the joining plate 16 may be directly connected to the lower end of the upper structure 2.

[0024] In this way, in this embodiment, at the construction site, the pile 1 and the superstructure 2 can be joined simply by attaching the connecting outer tube 17 to the connecting inner tube 11, thereby improving construction accuracy and quality and shortening work time, while absorbing the deviation between the designed axis and the core of the pile actually buried, and allowing the load acting on the superstructure 2 to be stably transmitted to the buried pile 1. [Industrial Applicability]

[0025] It is highly useful in civil engineering and construction work in general. [Explanation of symbols]

[0026] 1 stake 2 Superstructure 3 arm material 4 Female thread 8 Male thread 11 Inner cylinder for joining 12 Horizontal through hole 13 screw hole 14 Inner cylinder fixing bolt 16 Joint plate 17 Joint outer cylinder 18 Joint Plate 19 bolts / nuts 20 dent 21 Through hole 22 Plate-shaped body

Claims

1. A pile-to-superstructure joining structure for joining a buried pile to a superstructure to be installed on the pile, comprising a joining inner tube having a cylindrical shape with approximately the same diameter as the outer diameter of the pile, with three or more cylindrical arms detachably attached to its peripheral wall surface at equal intervals radially outward from the same circumference, and a cylindrical shape with an inner diameter larger than the outer diameter of the joining inner tube, with horizontally elongated through-holes formed on the side surface at the same intervals as the arms of the joining inner tube, with a vertical width that allows the arms of the joining inner tube to slide circumferentially, and screw holes formed in the middle of each pair of adjacent horizontally elongated through-holes toward the axial center, and bolts for fixing the inner tube screwed into the screw holes. a connecting outer tube and a connecting inner tube attached to the head of the pile, the connecting outer tube being attached to the head of the pile; a connecting inner tube with its arm members removed and pre-fixed to the head of the pile; a connecting outer tube being attached to the head of the pile; a connecting plate at the top of the connecting outer tube and the bottom of the superstructure being joined; and a connecting outer tube and a connecting inner tube being attached to the head of the pile; a connecting structure between a pile and a superstructure, the connecting outer tube and the ...

2. A joining structure between a pile and a superstructure as described in claim 1, characterized in that a cylindrical recess with an inner diameter slightly larger than the outer diameter of the arm member is formed on the outer surface of the peripheral wall of the joining inner tube, a female thread is formed concentrically from the center of the bottom surface of this recess toward the inner diameter side, and a male thread is protruded from the center of one end surface of the arm member along the axis, and the arm member is inserted into the recess and the male thread is screwed into the female thread, thereby removably attaching the arm member to the joining inner tube.

3. A joining structure between a pile and a superstructure as described in claim 1, characterized in that a through hole with an inner diameter slightly larger than the outer diameter of the arm member is formed in the peripheral wall of the joining inner tube, and a plate-like body with an internal thread formed in the center is fixed to the inner wall surface of the joining inner tube so that the internal thread is concentric with the through hole, and the arm member is removably attached to the joining inner tube by screwing the external thread of the arm member into the internal thread of the plate-like body.

4. 2. A joint structure for connecting a pile to a superstructure according to claim 1, wherein four sets of arm members are detachably attached to the peripheral wall surface of the connecting inner cylinder.

5. 2. The joint structure between a pile and a superstructure according to claim 1, wherein the pile is a steel pipe pile.

6. 2. The joint structure for connecting a pile and a superstructure according to claim 1, wherein the upper end of the pile is fixed to the joint inner tube by welding.

7. 2. The joining structure between a pile and a superstructure according to claim 1, characterized in that the joining between the pile and the superstructure is achieved by joining a joining plate attached to the lower end of the superstructure and a joining plate attached to the upper end of the joining outer cylinder with bolts and nuts.

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