Hangtou Structure

Abstract

To provide a pile head structure capable of arranging a structural body at a position interfering with a steel pipe.SOLUTION: A pile head structure comprises: a steel pipe 32 covering a pile head of a pile 20, in which concrete C is filled; and a covering plate (a seal plate F2) sealing a cutout part 32A provided in an upper tip part of the steel pipe 32.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] This disclosure relates to a pile head structure.

Background Art

[0002] The following Patent Document 1 shows a pile foundation structure in which a foundation beam is joined to an annular joint formed using a steel pipe.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the pile foundation structure of Patent Document 1 above, a steel pipe is used for the pile head. When forming the pile head using a steel pipe in this way, it is difficult to arrange structures such as beams and slabs that interfere with the pile head. If a structure that interferes with the pile head is formed, a notch is formed in the steel pipe. In such a case, there is a risk that concrete will flow out from the notch, making it difficult to ensure the strength of the pile head. For this reason, for example, in the pile foundation structure of Patent Document 1, the annular joint and the foundation beam are arranged apart and joined using joint concrete. However, depending on the building planning, there may be a case where it is desired to arrange structures such as beams and slabs at positions that interfere with the steel pipe.

[0005] In consideration of the above facts, an object of the present invention is to provide a pile head structure capable of arranging a structure at a position that interferes with a steel pipe.

Means for Solving the Problems

[0006] The pile head structure according to claim 1 covers the pile head of a pile and includes a steel pipe filled with concrete, In side view the upper end portion of the steel pipe So that a step is formedA notch provided therein, a column inserted into the steel pipe, and the notch twist downward Placed A beam joined to the aforementioned column, Arranged along the horizontal plane below the notch, It includes a covering plate that closes the gap between the steel pipe, the column, and the beam.

[0007] In the pile head structure of claim 1, a notch is provided at the upper end of the steel pipe. By providing a notch, structural elements such as beams and slabs can be placed in positions that would otherwise interfere with the steel pipe.

[0008] For example, when a structural beam is to be placed between the pile heads of adjacent piles, positioning this beam in the notch allows the beam to be configured so that it does not protrude above the steel pipe. Furthermore, by providing a notch, it is possible to create a step in the slab above, for example, using the area where the piles are installed as a boundary.

[0009] Furthermore, since the steel pipe is filled with concrete, the pile head can be fixed in place. And because the notch is sealed by a covering plate, leakage of the concrete filled in the steel pipe can be suppressed.

[0010] The pile head structure of claim 2 is, A steel pipe that covers the pile head and is filled with concrete, and a covering plate that closes the notch provided at the upper end of the steel pipe, The structure comprises a column inserted into the steel pipe, a cantilevered beam joined to the column below the notch, and a secondary beam positioned in the notch, spanning across the cantilevered beams joined to adjacent columns, and capable of supporting exterior materials.

[0011] In the pile head structure of claim 2, secondary beams are spanned across cantilevered main beams joined to adjacent columns, and these secondary beams are capable of supporting exterior cladding.

[0012] Here, since the secondary beams are positioned in the notched sections, the secondary beams can be brought closer to the columns compared to a configuration where the steel pipes are cantilevered outside the notches and supported by the main beams. This allows the exterior cladding to be moved closer to the building, making more effective use of the site around the building's perimeter.

[0013] Furthermore, since the secondary beams are positioned in the notched sections, they can be placed at a lower position compared to a configuration where the steel pipes are cantilevered above and supported by the main beams without forming notches. This allows for the creation of openings such as doorways in the exterior material.

[0014] The pile head structure of claim 3 is the pile head structure of claim 1, wherein a slab having a step is formed above the steel pipe, and the step is formed in the notched portion.

[0015] In the pile head structure of claim 3, a step in the slab can be formed at a position that interferes with the steel pipe by providing a notch. In other words, a step can be formed at a desired position regardless of the position of the pile.

[0016] The pile head structure of claim 4 is the pile head structure of claim 2, wherein a main beam is joined to the side surface of the column in two directions perpendicular to the cantilevered main beam and to the opposite side of the cantilevered main beam, and the main beam is fitted into a rectangular cutout formed in the steel pipe.

[0017] In the pile head structure of claim 4, the column is joined to a main beam fitted into the cut portion of the steel pipe. Therefore, the column can be supported by the steel pipe via the main beam without welding a base plate or the like to support the column base inside the steel pipe. [Effects of the Invention]

[0018] According to the present invention, the structure can be positioned in a location that interferes with the steel pipe. [Brief explanation of the drawing]

[0019] [Figure 1] (A) is a cross-sectional view showing a pile head structure according to an embodiment of the present invention, (B) is a cross-sectional view of (A) along line BB, and (C) is a cross-sectional view of (A) along line CC. [Figure 2] This is a perspective view showing a notched portion and a cut-out portion formed in a steel pipe in a pile head structure according to an embodiment of the present invention. [Figure 3]In the pile head structure according to an embodiment of the present invention, it is a perspective view showing a state in which a beam is fitted into a cutout portion formed in a steel pipe and a closing plate is arranged. [Figure 4] (A) is a cross-sectional view showing the arrangement of the closing plate in the pile head structure according to an embodiment of the present invention, (B) is a cross-sectional view taken along line B-B of (A), and (C) is a cross-sectional view taken along line C-C of (A). [Figure 5] In the pile head structure according to an embodiment of the present invention, it is a perspective view showing a state in which a closing plate is arranged. [Figure 6] In the pile head structure according to an embodiment of the present invention, it is a cross-sectional view showing a modified example in which a slab having a step is arranged by omitting the small beam. [Figure 7] (A) is a cross-sectional view showing a modified example of the closing plate in the pile head structure according to an embodiment of the present invention, (B) is a cross-sectional view taken along line B-B of (A), and (C) is a cross-sectional view taken along line C-C of (A). [Figure 8] In the pile head structure according to an embodiment of the present invention, it is a perspective view showing a state in which the closing plate according to the modified example is arranged.

Mode for Carrying Out the Invention

[0020] Hereinafter, the pile head structure according to an embodiment of the present invention will be described with reference to the drawings. Components denoted by the same reference numerals in each drawing mean the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of components may exist.

[0021] Also, descriptions of overlapping configurations and reference numerals in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and appropriate changes such as omitting configurations or replacing them with different configurations can be made within the scope of the object of the present disclosure and implemented.

[0022] In each drawing, the directions indicated by arrows X and Y are along the horizontal plane and are perpendicular to each other. The direction indicated by arrow Z is along the vertical direction (up and down). In each drawing, the directions indicated by arrows X, Y, and Z are assumed to coincide with each other.

[0023] <Pile cap structure> The pile head structure according to an embodiment of the present invention is a pile cap 30 structure that transmits the load of the building 10 to the pile 20 shown in Figure 1. The pile cap 30 is connected to the pile 20, the columns 12 and beams 14 of the building 10.

[0024] The pile 20 is, for example, a steel pipe pile. The column 12 is a square steel pipe, and the beam 14 is an H-shaped steel. The inside of the column 12 may or may not be filled with concrete. The lower end of the column 12 is inserted into the steel pipe 32, which will be described later. The pile head of the pile 20 and the lower end of the column 12 are spaced apart in the vertical direction. The lower end of the column 12 and the lower end of the beam 14 are positioned at the same height.

[0025] (beam) As shown in Figure 1(C), the beam 14 comprises beams 14A, 14B, and 14C as examples of main beams in the present invention, and beam 14D as an example of a cantilevered main beam in the present invention. These beams 14A to 14D are joined to the side surface of the column 12.

[0026] Beams 14A and 14B are foundation beams extending in the Y direction, and beam 14C is a foundation beam extending in the X direction. Furthermore, beam 14D is a foundation beam extending in the X direction, joined to column 12 on the side opposite to beam 14C. In other words, beams 14A and 14B are beams extending in two directions perpendicular to beam 14D, and beam 14C is a foundation beam extending on the opposite side of beam 14D.

[0027] Beams 14A, 14B, and 14C are spanned between adjacent columns 12, joined to the columns 12 inside the steel pipes 32 that form the pile caps 30, and protruding outwards from the steel pipes 32.

[0028] On the other hand, in building 10, no columns 12 are provided in the direction of extension of beam 14D. In the direction of extension of beam 14D, a retaining wall 16, which is the underground outer wall (outer wall in contact with the ground) of building 10 or the foundation of building 10, is located, and in a plan view, the exterior material 18 of building 10 is located between this retaining wall 16 and the columns 12, as shown by the dashed line in Figure 1(A). The exterior material 18 includes some or all of the structural frame, fittings, exterior wall finishing materials and insulation materials that form the exterior wall of building 10.

[0029] As shown in Figures 1(A) and (B), beam 14D is a cantilever beam with a smaller beam depth than beams 14A, 14B, and 14C. Beam 14D is positioned so that its lower end is aligned with beams 14A, 14B, and 14C, and its upper end is positioned lower than beams 14A, 14B, and 14C. As a result, beam 14D is connected to column 12 below the notch 32A, which will be described later.

[0030] Furthermore, beam 14D has a shorter length along the extension direction than beams 14A, 14B, and 14C. Specifically, beam 14D is positioned at a location that approximately coincides with the position of the outer surface of the steel pipe 32, whose tip forms the pile cap 30.

[0031] (Pile cap) The steel pipe 32 forming the pile cap 30 is a cylindrical steel pipe. The steel pipe 32 is positioned to cover the base of the column 12 and the pile head of the pile 20, and concrete C is poured and filled inside the steel pipe 32.

[0032] As shown in Figure 2, the steel pipe 32 has a notch 32A and a cut-out portion 32B. The notch 32A is the portion where the upper end of the steel pipe 32 is cut out, as shown by the dashed line E1. The height of the upper end of the steel pipe 32 in the portion where the notch 32A is formed is the same as the height of the upper end of the beam 14D.

[0033] On the other hand, the cut-out portion 32B is the portion of the steel pipe 32 that is cut off in a way that would interfere with the beams 14A to 14D. The cut-out portion 32B is formed in a roughly rectangular shape, extending between the upper and lower flanges of the beams 14A to 14D. The beams 14A to 14D are each fitted into the cut-out portion 32B.

[0034] (Blocking plate) Here, a sealing plate F1 is placed between the upper and lower flanges of beams 14A to 14D. As shown in Figure 1(C), the sealing plate F1 is provided at a position that coincides with the steel pipe 32 in a plan view, and is a plate material that closes the cut-out portion 32B shown in Figure 2.

[0035] Furthermore, as shown in Figures 3 and 4, with the columns 12 and beams 14 assembled to the steel pipe 32, a sealing plate F2, which is an example of a covering plate in the present invention, is provided on the pile cap 30. In Figure 4, the location where the sealing plate F2 is placed is indicated by hatching.

[0036] As shown in Figure 3, the sealing plate F2 is a plate material that closes the gap between the upper flange of the beam 14D and the steel pipe 32 in the notched portion 32A, as well as the gap between the outer surface of the column 12 and the sealing plate F1, and is arranged along the horizontal plane.

[0037] As shown in Figure 4(A), the sealing plate F2 is positioned at the same height as the upper flange of the beam 14D, and as shown in Figure 4(C), the outer surface that contacts the steel pipe 32 is formed in a circular shape so as to follow the inner surface of the steel pipe 32. In addition, the X-direction end of the sealing plate F2 is joined to the web of the beam 14A or 14B.

[0038] As shown in Figure 5, this sealing plate F2 closes the notch 32A, thereby separating the inside and outside of the steel pipe 32.

[0039] (small beam) As shown in Figure 1(A), a secondary beam 40 is positioned in the notched section 32A. Note that in Figures 2 to 5, the secondary beam 40 is omitted from the illustration in order to clarify the other components.

[0040] The secondary beam 40 rests on and spans the beam 14D, which is connected to the adjacent column 12. The upper end of the secondary beam 40 is positioned at the same height as the upper ends of beams 14A to 14C.

[0041] The lower flange of the secondary beam 40 is cut off where it rests on the beam 14D. A connecting plate J1, fixed to the upper flange of the beam 14D and oriented vertically, is placed in this cut-off portion. The connecting plate J1 is bolted to the web of the secondary beam 40.

[0042] Furthermore, as shown in Figure 1(C), the portions of the upper and lower flanges of the secondary beam 40 that interfere with the outer diaphragm 12A of the column 12 are cut away.

[0043] As shown in Figure 1(A), the joist 40 is designed to support the exterior cladding 18. The exterior cladding 18 may be positioned along the joist 40, directly above the joist 40, or it may be positioned offset towards the retaining wall 16 from directly above the joist 40. If it is offset, metal fittings or the like should be used to transfer the load of the exterior cladding 18 to the joist 40.

[0044] <Mechanism and Effects> In the pile head structure according to an embodiment of the present invention, as shown in Figure 2, a notch 32A is provided at the upper end of the steel pipe 32 in the pile cap 30. By providing the notch 32A, a structural element such as a beam 40 can be placed at a position that interferes with the steel pipe 32, as shown in Figure 1.

[0045] The secondary beam 40 spans between the pile heads of adjacent piles 20. In other words, the secondary beam 40 spans the beam 14D embedded in the pile caps 30 that form the pile heads of adjacent piles 20. Since the secondary beam 40 is positioned in the notch 32A, it can be configured so that the secondary beam 40 does not protrude above the steel pipe 32. This allows the exterior material 18 to be supported directly above the steel pipe 32.

[0046] Furthermore, since concrete C is filled into the steel pipe 32, the pile head of the pile 20 and the column base of the column 12 can be fixed to the inside of the steel pipe 32. In addition, since the notch 32A is closed by a sealing plate F2 as a covering plate, as shown in Figure 5, leakage of the concrete filled into the steel pipe 32 can be suppressed.

[0047] Furthermore, in the pile head structure according to the embodiment of the present invention, a secondary beam 40 is spanned across a beam 14D joined to adjacent columns 12, and an exterior cladding material 18 can be supported by this secondary beam 40.

[0048] Here, the secondary beam 40 is positioned in the notched section 32A. This configuration allows the secondary beam 40 to be positioned closer to the column 12. This allows the exterior cladding 18 to be moved closer to the building 10, making effective use of the site around the building's perimeter.

[0049] In contrast, if the notch 32A is not formed, for example, the tip of the beam 14D is extended to the outside of the steel pipe 32 to support the secondary beam 40. In this case, since the secondary beam 40 is supported by the beam on the outside of the steel pipe 32, it is positioned far from the column 12.

[0050] Furthermore, with the configuration in which the joist 40 is positioned in the notched portion 32A, the joist 40 can be placed at a lower position. This allows for the formation of sliding openings such as doorways in the exterior material 18.

[0051] In contrast, if the notch 32A is not formed, for example, the upper end of the beam 14D is positioned to align with the upper end of the steel pipe 32 to support the secondary beam 40. In this case, since the secondary beam 40 is supported by the beam above the upper end of the steel pipe 32, it is difficult to position the secondary beam 40 at a low position.

[0052] Furthermore, in the pile head structure according to the embodiment of the present invention, the column 12 is joined to beams 14A to 14D that are fitted into the cut portion 32B of the steel pipe 32 shown in Figure 2. Therefore, the column 12 can be supported by the steel pipe 32 via beams 14A to 14D without welding a base plate or the like that to support the base of the column 12 inside the steel pipe 32.

[0053] <Other Embodiments> In the above embodiment, a small beam 40 is placed in the notched portion 32A, but the embodiments of the present invention are not limited to this. For example, as shown in Figure 6, the small beam 40 may be omitted. In the example shown in this figure, a slab 50 having a step 52 is formed above the steel pipe 32, and this step 52 is formed in the notched portion 32A.

[0054] The "step" refers to the section connecting the slab 50A, which is positioned higher, and the slab 50B, which is positioned lower. This step 52 is formed along the extension direction of beams 14A and 14B (see Figure 1(C)).

[0055] Furthermore, stud bolts or the like may be welded to the upper surfaces of beams 14A to 14D to allow stress to be transmitted between the concrete forming the slab 50 and these beams.

[0056] In this way, by forming the notch 32A, a step 52 can be formed in the slab 50 even at a position that would interfere with the steel pipe 32. This improves the flexibility of the building plan 10. In the example where the step 52 is formed in the notch 32A, the beam 14D may extend to the outside of the steel pipe 32. In this case, a column can be provided in the direction of the extension of the beam 14D, and the end of the beam 14D can be joined to this column.

[0057] Furthermore, in the above embodiment, only a blocking plate F2 arranged along a horizontal plane is used as the covering plate, but the embodiments of the present invention are not limited to this. For example, as shown in Figures 7 and 8, in addition to a blocking plate F3 arranged along a horizontal plane, a blocking plate F4 arranged along a vertical plane may also be used as the covering plate.

[0058] As shown in Figure 7(C), the cover plate F3 has a shorter dimension in the X direction compared to the cover plate F2 shown in Figure 4(C). That is, the X-direction end of the cover plate F3 is positioned with a gap between it and the web of beam 14A or 14B. The other configurations of the cover plate F3 are the same as those of the cover plate F2.

[0059] On the other hand, as shown in Figure 8, the sealing plate F4 is a plate material that closes the gap between the column 12 and the sealing plates F1 in the beams 14A and 14B at the notch 32A, and is arranged along the vertical plane.

[0060] As shown in Figure 7(A), the sealing plate F4 is positioned so that its position in the X direction is aligned with the end of the upper flange of beam 14B. The upper end of sealing plate F4 is joined to the upper flanges of beams 14A and 14B, and the lower end of sealing plate F4 is joined to the upper surface of sealing plate F3. By using sealing plate F4 positioned along the vertical plane in this way, the amount of concrete C to be filled can be increased. [Explanation of symbols]

[0061] 12 pillars 14A Beam (Large beam) 14B Beam (Large beam) 14C beam (beam) 14D Beam (Cantilevered main beam) 20 stakes 32 Steel pipe 32A Notch 32B Cutout 50 slab 52 steps F2 Covering plate (covering plate) F3 Covering plate (covering plate) F4 Covering plate (covering plate) C Concrete

Claims

1. A steel pipe that covers the pile head and is filled with concrete, A notch is provided such that a step is formed at the upper end of the steel pipe when viewed from the side, The column inserted into the steel pipe, A beam positioned below the notch and joined to the column, A covering plate is positioned below the notch along the horizontal plane and closes the gap between the steel pipe, the column and the beam, A pile head structure having the following characteristics.

2. A steel pipe that covers the pile head and is filled with concrete, A covering plate that closes the notch provided at the upper end of the steel pipe, The column inserted into the steel pipe, A cantilevered beam joined to the column below the notched portion, A small beam is positioned in the notch, spanning across the cantilevered main beam which is joined to adjacent columns, and capable of supporting the exterior material. A pile head structure equipped with this.

3. A slab with a step is formed above the steel pipe. The aforementioned step is formed in the notched portion. The pile head structure according to claim 1.

4. The pile head structure according to claim 2, wherein a main beam is joined to the side of the column in two directions perpendicular to the cantilevered main beam and extending to the opposite side of the cantilevered main beam, and the main beam is fitted into a rectangular cutout formed in the steel pipe.

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