Connection structure between support pile and decking beam

Abstract

To provide a connection structure between a support pile and a decking beam which can firmly join a pile head cap to a pile head part of the support pile by tightening clamp bolts while absorbing a construction error of the support pile without executing site welding.SOLUTION: A pile head cap 10 having a support pile construction error absorption function is inserted into a space between a head part of a support pile 30 made of an H-shaped steel and a decking beam. The pile head cap 10 can be placed on a pile head of the support pile 30, and comprises: a top plate 11 having plural connection holes 12 at a plate face; a sagging plate 15 downwardly projecting on a lower face of the top plate 11; and plural cramp bolts 20 screwed on the sagging plate 15 so as to be advanced and retreated. By externally installing the sagging plate 15 of the pile head cap 10 to the support pile 30 and adjusting a protrusion amount of the plural cramp bolts 20, the adjustment of a fitting position of the pile head cap 10 relative to the support pile 30 is made possible, and the decking beam is placed on the top plate 11 of the pile head cap 10 fixed to the pile head part of the support pile 30 by tightening the plural cramp bolts 20 with plural connection bolts.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a construction technique for temporary structures such as temporary piers, and more particularly to a joint structure between a bearing head and a supporting girder, in which a supporting girder is joined to the head of a supporting pile using a pile head cap having a construction error absorbing function. [Background technology]

[0002] When constructing or repairing roads, etc., temporary piers are constructed beside the road to serve as passageways and waiting areas for personnel and vehicles. To construct the substructure of a temporary bridge, support piles made of steel pipes or H-shaped steel are driven into the ground and the tops of the support piles are cut to the specified height. When placing and joining a support girder to the head of a support pile, construction errors may occur in the support pile.

[0003] As a means for adjusting construction errors of support piles, it is known to provide a flat top plate at the head of the pile to adjust the placement position (Patent Document 1). The specific construction method involves fine-tuning the horizontal position when placing the top plate on the pile head, and then welding the top plate on site to secure it to the pile head. Finally, the support beam is placed in the correct position on the top plate, and multiple fixing bolts are screwed between the support beam and the top plate to connect them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-186056 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional technologies for connecting support piles and beams have the following problems to be solved: <1> The quality of the top plate welding varies greatly depending on factors such as whether the worker has welding qualifications, differences in welding skill, and the weather on the day. <2> If the pile head height of the support pile is lower than the normal position, extension steel must be added by on-site welding, which requires a lot of time and effort to adjust the pile head height to the normal position. <3> When dismantling and removing the support piles to be reused, the welded top plate cannot be reused, so it is cut at a height of about 50 cm below the neck of the support pile. The cut pieces of the support piles with the top plates attached must be disposed of as scrap, which is uneconomical. <4> On-site welding work requires skilled workers, but the chronic shortage of skilled workers in recent years has become a major issue. Therefore, there is a need to propose alternative techniques that can join materials at low cost without welding.

[0006] An object of the present invention is to provide a joint structure between a support pile and a support girder that can solve the above problems. [Means for solving the problem]

[0007] The present invention provides a support head and support girder joining structure in which a steel support girder is placed between the heads of adjacent H-shaped steel support piles and fixed with a plurality of connecting bolts, and a pile head cap having a function of absorbing construction errors of the support pile is interposed between the heads and support girder of the support pile, and the pile head cap can be placed on the head of the support pile and is equipped with a top plate having a plurality of connecting holes on its plate surface, a hanging plate protruding downward from the underside of the top plate so that it can be attached to the support pile, and a plurality of clamp bolts screwed to the hanging plate so that it can be moved forward and backward, and the hanging plate of the pile head cap is attached to the support pile and the attachment position of the pile head cap relative to the support pile can be adjusted by adjusting the protruding amount of the plurality of clamp bolts, and a support girder is placed on the top plate of the pile head cap which is fixed to the head of the support pile by tightening the plurality of clamp bolts and fixed with a plurality of connecting bolts. In another form of the present invention, the hanging plate comprises a pair of flange opposing walls which are integrally fixed to the underside of the top plate and formed facing downwardly opposite each other, and a pair of web opposing walls which are integrally fixed to the underside of the top plate and formed facing downwardly opposite each other, and the pair of flange opposing walls and the pair of web opposing walls are in a perpendicular relationship. In another embodiment of the present invention, a plurality of clamp bolts are threadedly attached to the pair of flange opposing walls and the pair of web opposing walls at opposing positions so as to be movable forward and backward. In another embodiment of the present invention, the top plate has a square or rectangular planar shape. In another embodiment of the present invention, the top plate is provided with a plurality of rows of connecting holes so that the placement position of the support beam relative to the top plate can be adjusted. In another embodiment of the present invention, the rows of a plurality of connecting holes arranged in a row on the top plate are formed to intersect with each other so that the orientation in which the support beam is placed on the top plate can be selected. In another embodiment of the present invention, a plurality of clamp bolts may be provided in multiple stages on the hanging plate. In another embodiment of the present invention, one or more reinforcing ribs may be fixed between the side surfaces of the flange-facing wall and the web-facing wall and the underside of the top plate for reinforcement. Effect of the Invention

[0008] The present invention has at least one of the following advantages. <1> By adjusting the protruding amount of the multiple clamp bolts equipped on the pile head cap, construction errors in the support pile can be absorbed while the clamp bolts are tightened to firmly join the pile head cap to the pile head of the support pile. <2> Since the support girder can be attached to the pile head of the support pile and joined via the pile head cap, no welding work is required at all, thereby eliminating the conventional problems caused by welding work. <3> By selecting a row of multiple connecting holes arranged in a row on the top plate, the placement position of the support beam relative to the top plate can be adjusted. <4> By forming rows of multiple connecting holes in the top plate so that they cross each other, the direction in which the support beam is placed can be freely selected without having to replace the pile head cap on the support pile. <5> When dismantling a temporary pier or bridge, the pile cap can be separated from the supporting pile by the simple operation of loosening the clamp bolt. The separated pile cap can be reused. [Brief description of the drawings]

[0009] [Figure 1] An explanatory diagram of the joint structure between the pile head and the support girder of a support pile using a pile head cap [Diagram 2] Perspective view of pile cap [Diagram 3] An explanatory diagram of the dimensional relationship between the pile cap hanging plate and the supporting pile [Figure 4] In the diagrams illustrating the method of joining a support pile and a support girder, (A) is an explanatory diagram of the work of cutting the head of the support pile, (B) is an explanatory diagram of the work of putting a pile head cap on the head of the support pile, and (C) is an explanatory diagram of the work of fixing the pile head cap to the head of the support pile. [Diagram 5] An explanatory diagram of the joint between the head of a support pile and the support girder after the construction error of the support pile was corrected with a pile head cap. [Figure 6] A side view of the joint between the head of a support pile and a support girder, with the head cap adjusted in height relative to the head of the support pile. [Figure 7] A side view of the joint between the pile cap and the support girder of a support pile connected with a support girder mounted on the pile cap [Figure 8] A plan view of the pile cap and the support girder mounting section, with the support girder mounted so that it can be displaced relative to the top plate of the pile cap. [Figure 9] A side view of the pile cap and the support girder mounting part, in which the support girder is mounted so as to be displaceable relative to the top plate of the pile cap. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. For the purposes of explanation, the bridge axis direction is defined as X and the direction perpendicular to the bridge axis is defined as Y, but X and Y may be combined in the opposite directions.

[0011] <1> support pile In the present invention, a form in which a support pile 30 made of H-shaped steel is used will be described. The support pile 30 made of H-shaped steel has a pair of flanges 31 and a web 32.

[0012] <2> Pile cap Referring to Figures 1 and 2, the pile head cap 10 used in the present invention is a mounting bracket that is attached to the head of the support pile 30 to adjust construction errors of the support pile 30, and a support girder 40 is mounted on the head of the support pile 30 via the pile head cap 10.

[0013] The pile head cap 10 comprises a top plate 11 that can be placed on the pile head of the support pile 30, a hanging plate 15 protruding downward from the underside 11a of the top plate 11 to exteriorly cover the support pile 30, and a plurality of clamp bolts 20 screwed into the hanging plate 15 in the penetrating direction.

[0014] <2.1> Tabletop The top plate 11 is a flat plate interposed between the support pile 30 and the support girder 40 of the temporary bridge, and is larger than the planar shape of the pile head of the support pile 30. A plurality of connecting holes 12 are arranged at predetermined intervals on the surface of the top plate 11.

[0015] <2.1.1> Shape of the top plate There is no limitation on the planar shape of the top plate 11, but in practice it is square or rectangular.

[0016] <2.1.2> Connecting hole The top plate 11 has a plurality of connecting holes 12 arranged in rows along the X direction and the Y direction (directions perpendicular to each other). The spacing between the connecting holes 12 in the top plate 11 is formed to match the spacing between the connecting holes 41 in the support beam 40 . The multiple connecting holes 12 arranged in a row are parallel to each other along the X direction or the Y direction. The reason why the connecting holes 12 in the top plate 11 are formed facing both the X direction and the Y direction is so that the orientation of the support beam 40 placed on the top plate 11 can be selected according to the site.

[0017] The reason why two or more rows of connecting holes 12 facing the same direction are provided is to appropriately select the mounting position of the support beam 40 on the upper surface 11b of the top plate 11.

[0018] <2.2> Hanging board The hanging plate 15 is a plate body that can be fitted at intervals to the head of the H-shaped steel support pile 30 , and works together with the clamp bolt 20 to adjust the construction error of the support pile 30 .

[0019] The hanging plate 15 is composed of a pair of flange opposing walls 15a, 15a erected opposite each other, and a pair of web opposing walls 15b, 15b erected opposite each other in a direction perpendicular to the flange opposing walls 15a, 15a. The opposing walls 15a and 15b constituting the hanging plate 15 are made of steel plates and are inseparably fixed to the lower surface 11a of the top plate 11 by welding or the like. The overall length and height of each of the opposing walls 15a, 15b are appropriately selected.

[0020] <2.2.1> Flange facing wall The pair of flange opposing walls 15a, 15a are plate bodies that are fitted onto the exterior of a pair of flanges 31, 31 of the support pile 30 and into which the tension bolt 20 is screwed.

[0021] <2.2.2> Web facing wall The pair of web opposing walls 15b, 15b are plate bodies that are fitted onto the webs 32 of the support piles 30 and into which the tension bolts 20 are screwed.

[0022] <2.2.3> Relationship between flange facing wall spacing and flange spacing of bearing piles The description will be made with reference to Fig. 3. In Fig. 3, the illustration of the auxiliary ribs and the connecting holes is omitted for ease of understanding. The opposing distance between the pair of flange opposing walls 15a, 15a is L 1 , the distance between the flanges 31, 31 is T 1When the above equation is satisfied, the opposing distance L between the pair of flange opposing walls 15a, 15a is 1 is the distance T between the flanges 31, 31 of the support pile 30 1 It has a larger dimensional relationship. These dimensional differences (L 1 >T 1 ) is an adjustment margin for the construction error of the support pile 30, so the opposing distance L between the pair of flange opposing walls 15a, 15a 1 is the distance T between flanges 31 and 31 1 Set appropriately according to the situation.

[0023] <2.2.4> Relationship between the spacing of the web facing walls and the web spacing of the bearing piles The description will be given with reference to FIG. 3. The opposing distance between the pair of web-opposing walls 15b, 15b is L 2 , the thickness of the web 32 of the support pile 30 is T 2 When the distance L between the pair of web-facing walls 15b is 2 is the thickness T of the web 32 of the support pile 30 2 It has a larger dimensional relationship. These dimensional differences (L 2 >T 2 ) is an adjustment margin for the construction error of the support pile 30, so the opposing distance L between the pair of web opposing walls 15b, 15b 2 is the thickness of the web 32 T 2 Set appropriately according to the situation.

[0024] <2.2.5> Bolt holes A plurality of bolt holes 16 are provided at intervals on the plate surfaces of the pair of flange opposing walls 15a, 15a and the pair of web opposing walls 15b, 15b. In this example, a set of two bolt holes 16, 17 are provided in each of the opposing walls 15a, 15b.

[0025] <2.2.6> Reinforcing ribs Between the side surfaces of the opposing walls 15a, 15b and the lower surface 11a of the top plate 11, one or more reinforcing ribs 14 are fixed for reinforcement. The reinforcing rib 14 is not essential, and the reinforcing rib 14 may be omitted.

[0026] <2.3> Clamp bolt The clamp bolt 20 is a bolt for correcting construction errors of the support pile 30, and is also a bolt for positioning the pile head cap 10 on the pile head of the support pile 30 so that it cannot be displaced. The clamp bolts 20 are provided opposite each of the opposing walls 15a, 15b. By adjusting the amount of protrusion of the opposing clamp bolts 20, the mounting position of the pile head cap 10 relative to the support pile 30 can be adjusted.

[0027] <2.3.1> Clamp bolt installation direction The clamp bolts 20 are screwed through the bolt holes 16 from the outside to the inside of each of the opposing walls 15a, 15b. The head of each clamp bolt 20 is located outside the corresponding opposing wall 15a, 15b, and the threaded portion protrudes inside the corresponding opposing wall 15a, 15b.

[0028] <2.3.2> Number of clamp bolts The number of clamp bolts 20 provided for each of the opposing walls 15a, 15b can be appropriately selected, but it is sufficient that there are two or more clamp bolts for each of the opposing walls 15a, 15b. In this example, a total of eight clamp bolts 20 are screwed into the four opposing walls 15a, 15b.

[0029] <2.3.3> Number of clamp bolts installed In this example, the clamp bolts 20 are provided in one stage in the circumferential direction of the hanging plate 15, but the clamp bolts 20 may be attached in multiple stages spaced apart in the height direction. FIG. 8 shows a configuration in which clamp bolts 20 are provided on two levels, upper and lower, of the hanging plate 15. The number of clamp bolts 20 to be attached and the number of stages to be installed can be appropriately selected taking into consideration the bending strength required of the pile head cap 10.

[0030] [Method of joining support piles and beams] A method of joining a support pile 30 and a support girder 40 using a pile cap 10 when constructing the substructure of a temporary bridge will be described with reference to Figs.

[0031] <1> Driving the supporting piles 4(A), an H-shaped steel support pile 30 is driven into the ground, and the pile head of the support pile 30 is cut to a predetermined height. The breaking height of the pile head of the support pile 30 is indicated by a chain line.

[0032] <2> Installation of pile cap The pile head cap 10 is placed on the pile head of the support pile 30 in the following manner. As shown in FIG. 4(B), each clamp bolt 20 of the pile head cap 10 is retracted in advance so that the clamp bolts 20 do not strike the support pile 30.

[0033] Next, as shown in Figure 4 (C), the pile head cap 10 is placed over the head of the support pile 30 with the hanging plate 15 facing downward, so that a pair of flange opposing walls 15a, 15a of the pile head cap 10 are positioned opposite the outer faces of a pair of flanges 31 that constitute the support pile 30, and a pair of web opposing walls 15b, 15b of the pile head cap 10 are positioned opposite both side faces of the web 32. Furthermore, the lower surface 11 a of the top plate 11 of the pile head cap 10 abuts against the upper end surface of the support pile 30 .

[0034] <3> Adjusting the position of the top plate of the pile cap When driving the support piles 30, construction errors may occur. If a construction error occurs in the support pile 30, as shown in Figure 5, the pile head cap 10 is moved horizontally while rotating each clamp bolt 20 provided on the hanging plate 15 of the pile head cap 10, thereby correcting the top plate 11 to the correct position.

[0035] FIG. 5 shows the state in which the pile cap 10 has been attached to absorb the construction error of the support pile 30. When a construction error occurs in the support pile 30, the pile head cap 10 is horizontally rotated or moved horizontally in the error correction direction while adjusting the protruding amount of the opposing clamp bolts 20. In other words, the orientation and position of the top plate 11 of the pile head cap 10 is corrected so that the top plate 11 of the pile head cap 10 matches the placement position of the support girder 40 to be mounted on the support pile 30. In the present invention, the clamp bolt 20 functions as a correction member (adjustment member) for the orientation and position of the top plate 11 of the pile head cap 10. In the present invention, by simply performing the simple task of rotating the clamp bolt 20 while the pile head cap 10 is placed on the pile head of the support pile 30, the top plate 11 of the pile head cap 10 can be corrected to the correct position even if there is a construction error in the support pile 30.

[0036] <4> Bolt fixing of pile cap Once the top plate 11 of the pile head cap 10 is aligned to the correct position, all opposing clamp bolts 20 are tightly tightened to fix the pile head cap 10 to the supporting pile 30 so that it cannot be displaced.

[0037] The position adjustment work of the pile head cap 10 described above is repeated to attach the pile head cap 10 to the pile head of each support pile 30.

[0038] In the present invention, the pile head cap 10 can be firmly fixed to the head of the support pile 30 by utilizing the tightening force of multiple clamp bolts 20, eliminating the need for welding work such as welding a steel top plate to the upper end surface of the support pile on site as in the conventional method. Furthermore, the use of the pile head cap 10 not only eliminates the need for welding work that requires highly skilled workers, but also resolves the problem of variations in fixing accuracy. The pile head cap 10 can be fixed by clamping the outer peripheral surface of the support pile 30 with opposing clamp bolts 20 without passing bolts through the support pile 30, so there is no need to process the support pile 30 to open bolt holes.

[0039] Furthermore, if there is no construction error in the support pile 30, there is no need to adjust the position of the pile head cap 10.

[0040] <5> When the cutting height of the support pile is low When cutting off the head of the support pile 30, the head of the support pile 30 may be cut off by mistake at a height lower than the normal position. Even in such a case, the height at which the support beam 40 is supported can be adjusted by using the pile cap 10.

[0041] In other words, if the upper end surface of the pile head of the support pile 30 is lower than the normal position, as shown in Figure 8, the pile head cap 10 is lifted to adjust the top plate 11 to the normal height, and then the clamp bolt 20 is tightened to fix it to the head of the support pile 30. In this way, even if the end face of the pile head of the support pile 30 is lower than the normal position, the height of the support pile head cap 10 can be adjusted to correct the top plate 11 to the normal height. Therefore, the conventional work of welding a separate extension steel material to the head of the support pile 30 to extend it is no longer necessary, and the time and labor required to adjust the pile head height to the correct position can be significantly reduced.

[0042] <6> Installation of receiving beams A support beam 40 is placed between adjacent support piles 30 via a pile head cap 10. When the support girder 40 is hung, the support girder 40 is mounted on the upper surface 11b of the top plate 11 constituting the pile head cap 10. As shown in Figures 7 and 8, the connecting hole 12 provided in the top plate 11 of the pile head cap 10 is aligned with the connecting hole 41 of the receiving girder 40, and a connecting bolt 42 is inserted into both holes 12, 41 to secure them in place.

[0043] <6.1> Selection of the mounting direction of the support beam A plurality of connecting holes 12 are arranged in a top plate 11 of the pile head cap 10 along two directions, the X direction and the Y direction. Therefore, the direction of the support girder 40 can be selected to be either the X direction or the Y direction and mounted on the pile head cap 10 without changing the pile head cap 10 for the support pile 30.

[0044] <6.2> Adjustment of the mounting position of the support beam By arranging multiple rows of connecting holes 12 in the X and Y directions on the top plate 11 of the pile head cap 10, it is possible to give the top plate 11 the function of correcting construction errors of the support piles 30. The top plate 11 has multiple rows of connecting holes 12 arranged so that the support beam 40 can be mounted not only at the center of the top plate 11, but also at a position offset from the center of the top plate 11 in the left-right direction (X direction) or the up-down direction (Y direction). Therefore, by selecting a specific arrangement of the connecting holes 12 from among the connecting holes 12 arranged in a row on the top plate 11 of the pile head cap 10, the support beam 40 can be mounted not only at the center of the top plate 11, but also shifted in the X or Y direction away from the center.

[0045] As mentioned above, construction errors in the support pile 30 can be corrected by rotating the clamp bolt 20 of the pile head cap 10, but there is a limit to how much the position of the pile head cap 10 can be adjusted by the clamp bolt 20. By selecting a particular arrangement of the connection holes 12 on the top plate 11 of the pile cap 10, the placement position of the support beam 40 can be corrected. In the present invention, by combining the position adjustment action of the pile head cap 10 using the clamp bolt 20 and the adjustment action of the mounting position of the support girder 40 using the top plate 11 of the pile head cap 10, it is possible to accommodate even large construction errors in the support pile 30.

[0046] <7> Removal of pile caps When dismantling a temporary pier or a temporary bridge, the pile head cap 10 can be removed from the head of the support pile 30 by a simple operation of simply loosening the clamp bolt 20. Unlike the conventional method, it is no longer necessary to cut the end of the support pile 30 short, and this eliminates the generation of scrap that needs to be disposed of, which is economical. Furthermore, the removed pile cap 10 can be reused any number of times. [Explanation of symbols]

[0047] 10. Pile cap 11. Pile cap top plate 11a Underside of the top plate 11b Top surface of the tabletop 12. Top plate connection hole 14. Reinforcement rib of pile cap 15 Pile cap flap 15a: Flange facing wall constituting the hanging plate 15b: Web facing wall constituting a hanging plate 20···Clamp bolt 30...Support pile 31... Flange 32. Web 40....Passing beam 41 ..... Receiver connection hole 42 Connecting bolt

Claims

1. A joint structure between a support pile and a support girder in which a steel support girder is placed between the heads of adjacent H-shaped steel support piles and fixed with a plurality of connecting bolts, A pile head cap having a function of absorbing construction errors of the support pile is interposed between the head of the support pile and the receiving girder, The pile head cap can be placed on the pile head of the support pile, and a top plate having a plurality of connection holes on a plate surface; A hanging plate protruding downward from the lower surface of the top plate so as to be able to be exteriorly mounted on the support pile; A plurality of clamp bolts are screwed to the hanging plate so as to be movable forward and backward. The pile head cap is fitted to the support pile, By adjusting the protruding amount of the plurality of clamp bolts, it is possible to adjust the mounting position of the pile head cap relative to the support pile, The pile head cap is fixed to the pile head of the support pile by tightening the clamp bolts, and a support girder is placed on the top plate of the pile head cap and fixed with a plurality of connecting bolts. Joint structure between support piles and receiving girders.

2. The joint structure between a support pile and a receiving girder as described in claim 1, characterized in that the hanging plate comprises a pair of flange opposing walls that are fixed integrally to the underside of the top plate and formed facing downward, and a pair of web opposing walls that are fixed integrally to the underside of the top plate and formed facing downward, and the pair of flange opposing walls and the pair of web opposing walls are in a perpendicular relationship.

3. 3. The joint structure for a support pile and a receiving girder as described in claim 2, characterized in that a plurality of clamp bolts are screwed in a movable manner at opposing positions of the pair of flange opposing walls and the pair of web opposing walls.

4. The joint structure for a support pile and a support girder according to claim 2, characterized in that the planar shape of the top plate is square or rectangular.

5. 3. The joint structure for a support pile and a support girder according to claim 2, wherein a plurality of rows of connecting holes are provided in the top plate so that the position of the support girder relative to the top plate can be adjusted.

6. The joint structure between a support pile and a support girder as described in claim 5, characterized in that the rows of connecting holes arranged in the top plate are formed to cross each other so that the direction in which the support girder is placed on the top plate can be selected.

7. 3. The joint structure for a support pile and a receiving girder according to claim 1 or 2, characterized in that a plurality of clamp bolts are provided in multiple stages on the hanging plate.

8. 3. The joint structure between the support pile and the support girder as described in claim 2, characterized in that one or more reinforcing ribs are fixed between the side surfaces of the flange facing wall and the web facing wall and the underside of the top plate for reinforcement.

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