Pile and column connection structure

Abstract

In a configuration where steel pipes support columns, this involves adjusting the relative position of the steel pipes and columns even if their relative positions are misaligned. [Solution] The pile-and-column joint structure comprises a steel pile installed in the ground, a steel pipe surrounding the pile head with its lower end, a steel column positioned above the pile and its lower end surrounded by the upper end of the steel pipe, filling concrete that fills the steel pipe and embeds the pile head and the lower end of the column inside, and a support member that at least a portion of which is attached to the steel pipe, allowing the column to be supported by the steel pipe and enabling adjustment of the relative position of the column with respect to the steel pipe.

Description

Technical Field

[0001] This disclosure relates to a joint structure between a pile and a column.

Background Art

[0002] The foundation structure described in Patent Document 1 includes a pile provided in the ground, a steel pipe surrounding the pile head of the pile, a steel column arranged on the pile head with the column foot inserted into the steel pipe, a filling concrete filled in the steel pipe with the pile head and the column foot buried therein, and a reinforcing steel shape buried in the filling concrete and extending from both sides of the column foot of the steel column and having the tip end in the extending direction joined to the steel pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a structure in which a pile and a steel column are joined through concrete filled in a steel pipe. Specifically, the upper end portion of the pile is inserted into the steel pipe, the lower end portion of the column is inserted into the steel pipe, and the pile and the steel column are joined through the concrete filled in the steel pipe by filling the inside of the steel pipe with concrete.

[0005] In such a configuration, a bracket extending horizontally may be attached to the lower end portion of the column, and a support portion for supporting this bracket from below may be provided on the steel pipe to position the column with respect to the steel pipe. However, when the steel pipe is inclined with respect to the vertical direction, the column will also be inclined.

[0006] The problem of this disclosure is to adjust the relative position between the steel pipe and the column even when the relative position between the steel pipe and the column is displaced in a configuration where the steel pipe supports the column. [Means for solving the problem]

[0007] The pile-and-column joint structure according to the first embodiment is characterized by comprising: a pile provided in the ground; a steel pipe surrounding the pile head of the pile with its lower end portion; a steel column positioned above the pile and whose lower end portion is surrounded by the upper end portion of the steel pipe; filling concrete that is filled into the steel pipe and embeds the pile head and the lower end portion of the column inside; and a support member that is at least partially attached to the steel pipe, supporting the column on the steel pipe and allowing adjustment of the relative position of the column with respect to the steel pipe.

[0008] According to the above embodiment, the support member that supports the column on the steel pipe is adjustable in relation to the steel pipe. This allows for adjustment of the relative position between the steel pipe and the column even if the relative position between the steel pipe and the column is misaligned in the configuration in which the steel pipe supports the column.

[0009] The pile-column joint structure according to the second embodiment is characterized in that, in the pile-column joint structure described in the first embodiment, the steel pipe is erected on the upper surface of a leveling concrete section formed on the ground, and an adjustment member is attached to the steel pipe that allows adjustment of the relative position of the steel pipe with respect to the upper surface.

[0010] According to the above embodiment, the adjustment member attached to the steel pipe allows for adjustment of the relative position of the steel pipe with respect to the upper surface of the leveling concrete section. This makes it possible to position the steel pipe so that it extends vertically even if the upper surface of the leveling concrete section is inclined with respect to the horizontal plane.

[0011] The pile-and-column joint structure according to the third embodiment is characterized in that, in the pile-and-column joint structure described in the second embodiment, the steel pipe and the column are provided outdoors, and the adjustment member is positioned below the running surface of a work vehicle traveling to the side of the steel pipe.

[0012] According to the above embodiment, the adjustment member is positioned below the running surface of the work vehicle traveling alongside the steel pipe. This prevents the adjustment member from being damaged by the vehicle traveling alongside the steel pipe.

[0013] The pile-column joint structure according to the fourth embodiment is characterized in that, in the pile-column joint structure according to any one of the first to third embodiments, the support member is embedded in the filling concrete, a shear connector is provided at the lower end of the column which is embedded in the filling concrete and which is capable of transmitting shear force between the column and the filling concrete, and the shear connector is positioned below the support member.

[0014] According to the above embodiment, the shear connector provided at the lower end of the column is positioned below the support member. This makes it possible to suppress the reduction in workability caused by the shear connector when adjusting the relative position between the steel pipe and the column from above using the support member before concrete is filled into the steel pipe. [Effects of the Invention]

[0015] According to this disclosure, in a configuration in which a steel pipe supports a column, the relative position between the steel pipe and the column can be adjusted even if the relative position between the steel pipe and the column is misaligned. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view showing a pipe rack equipped with a pile-and-column joint structure according to an embodiment of the present disclosure. [Figure 2] This is a perspective view showing a portion supporting a pipe rack equipped with a pile-and-column joint structure according to an embodiment of the present disclosure. [Figure 3] This is an overall cross-sectional view showing a pile-column joint structure according to an embodiment of the present disclosure. [Figure 4] (A)(B) These are a side cross-sectional view and a plan cross-sectional view showing the pile head of a pile-column joint structure according to an embodiment of the present disclosure. [Figure 5]The perspective view which showed the pile head part of the pile and column joining structure which concerns on embodiment of this indication. [Figure 6] The front view which showed the adjustment member which adjusts the inclination of the steel pipe of the pile and column joining structure which concerns on embodiment of this indication. [Figure 7] (A)(B) The side sectional view which showed the base end part of the column in the pile and column joining structure which concerns on embodiment of this indication, and the plan sectional view. [Figure 8] The perspective view which showed the base end part of the column in the pile and column joining structure which concerns on embodiment of this indication. [Figure 9] The perspective view which showed the base end part of the column in the pile and column joining structure which concerns on embodiment of this indication.

FORM FOR CARRYING OUT THE INVENTION

[0017] An example of the pile and column joining structure which concerns on embodiment of this indication is demonstrated using FIGS. 1-9. The arrow H shown in each figure is the vertical direction of the pile and column joining structure, and shows the vertical direction. The arrow W shown in each figure is the width direction of the pile and column joining structure, and is orthogonal to the arrow H and shows the horizontal direction. The arrow D shown in each figure is the depth direction of the pile and column joining structure, and is orthogonal to the arrow H and the arrow W and shows the horizontal direction.

[0018] (Overall structure) First, the pipe rack 100 which has the column supported using the pile and column joining structure 10 which concerns on this embodiment is demonstrated. The pipe rack 100 is installed outdoors in the factory, and is a member which supports equipment piping etc., and is a so-called piping stand of the factory.

[0019] As shown in FIG. 1, the pipe rack 100 includes a plurality of portal frames 110 arranged at intervals in the depth direction, and a plurality of connecting frames 120 which connect the adjacent portal frames 110.

[0020] The portal frame 110 comprises a pair of columns 50 spaced apart in the width direction, and a beam 112 that extends in the width direction and spans the pair of columns 50. The columns 50 are formed using H-shaped steel, and the lower ends of the columns 50 are embedded inside the steel pipe 30.

[0021] The beams 112 are formed using H-shaped steel members and are provided in three separate units spaced apart in the vertical direction. The uppermost beam 112 spans the tops of a pair of adjacent columns 50.

[0022] The connecting frame 120 is formed using H-beams, extends in the depth direction, and spans adjacent columns 50 in the depth direction. Specifically, both ends of the connecting frame 120 are connected to the columns 50 at the points where the beams 112 are connected.

[0023] (Pile and column connection structure 10) Next, we will describe the joint structure 10 between the pile and the column (hereinafter referred to as "joint structure 10"). Specifically, we will describe the joint structure 10 between the column 50 provided on the pipe rack 100 and the pile 20 embedded in the ground.

[0024] As shown in Figures 2 and 3, the joint structure 10 comprises a pile 20, a steel pipe 30, an adjustment member 40, a column 50, a filling concrete 60, and a support member 70.

[0025] [Pile 20] As shown in Figure 3, the pile 20 is a pre-fabricated cylindrical pile installed in the ground, protruding upward from the upper surface 64a of the base portion 64, which is rectangular in plan view (see Figure 2). A headed stud 22 is attached to the pile head 20a, protruding radially from the pile 20. Specifically, the headed studs 22 are provided in two stages spaced apart in the vertical direction, and are provided spaced apart in the circumferential direction of the pile 20 so as to protrude in four directions from the pile 20 (see Figure 5).

[0026] The base portion 64 is formed on the ground with so-called lean concrete, and the upper surface 64a of the base portion 64, which faces upward, is positioned below the ground level (GL) of the work vehicle traveling alongside the steel pipe 30. The base portion 64 is an example of a leveling concrete section formed by concrete poured into the ground.

[0027] [Steel pipe 30] The steel pipe 30 is cylindrical in shape and extends vertically, and is supported by the base portion 64 as shown in Figures 2 and 3. Thus, the steel pipe 30 is erected from the upper surface 64a of the base portion 64. The lower end portion of the steel pipe 30 surrounds the pile head 20a of the pile 20. An adjustment member 40 is attached to the outer circumferential surface 30a of the steel pipe 30, which allows adjustment of the relative position of the steel pipe 30 with respect to the upper surface 64a of the base portion 64.

[0028] [Adjustment member 40] As shown in Figures 4(A) and (B), four adjustment members 40 are provided spaced apart in the circumferential direction of the steel pipe 30. Specifically, a pair of adjustment members 40 are provided on either side of the steel pipe 30 in the depth direction, and a pair of adjustment members 40 are provided on either side of the steel pipe 30 in the width direction. All of the adjustment members 40 are positioned below the running surface GL (see Figure 3) of the work vehicle traveling along the side of the steel pipe 30.

[0029] The adjustment member 40 comprises a support plate 42 whose end face is attached to the outer surface 30a of the steel pipe 30 and whose thickness direction is the circumferential direction of the steel pipe 30, and an adjustment plate 44 attached to the lower end of the support plate 42 and whose thickness direction is the vertical direction. Furthermore, the adjustment member 40 comprises an anchor bolt 46a and a nut 46b screwed onto the anchor bolt 46a.

[0030] The support plate 42 is rectangular in shape, extending vertically when viewed from the plate thickness direction. The adjustment plate 44 is rectangular in shape, extending circumferentially around the steel pipe 30 when viewed from the plate thickness direction. The adjustment plate 44 is divided into two sections by the support plate 42 when viewed from above. Furthermore, through holes (not shown) that penetrate vertically are formed in each section of the adjustment plate 44.

[0031] As shown in Figure 6, the anchor bolt 46a protrudes upward from the upper surface 64a of the base portion 64, and the protruding portion of the anchor bolt 46a is inserted into a through hole formed in the adjustment plate 44. Furthermore, a pair of nuts 46b are tightened onto the anchor bolt 46a, sandwiching the adjustment plate 44 from above and below.

[0032] In this configuration, the relative positions of the upper surface 64a of the base portion 64 and the steel pipe 30, such as height and inclination, can be adjusted by changing the vertical position of the adjustment plate 44 which is sandwiched between a pair of nuts 46b.

[0033] [Column 50, filling concrete 60] The column 50 is an H-shaped steel member and, as shown in Figure 3, is composed of a pair of flanges 50a and a web 50b connecting the pair of flanges 50a. The lower end portion of the column 50 is surrounded by the upper end portion of the steel pipe 30.

[0034] The filling concrete 60 is filled inside the steel pipe 30. The pile head 20a of the pile 20 is embedded in the lower end portion of the filling concrete 60, and the lower end portion of the column 50 is embedded in the upper end portion of the filling concrete 60. In this state, the upper end of the pile 20 and the lower end of the column 50 are separated in the vertical direction. In this way, the column 50 is joined to the pile 20 via the filling concrete 60.

[0035] Furthermore, the headed studs 22 attached to the aforementioned piles 20 are also embedded in the filling concrete 60, and the headed studs 22 are designed to transmit shear force between the piles 20 and the filling concrete 60.

[0036] Furthermore, as shown in Figure 7(A), a plate member 54 with a plate thickness direction oriented vertically is attached to the lower end of the column 50. In addition, a headed stud 56 embedded in the concrete is attached to the lower end portion of the column 50. Specifically, the headed stud 56 is provided in two stages spaced apart in the vertical direction and is provided to protrude in four directions from the column 50, spaced apart in the circumferential direction (see Figure 8). As a result, the headed stud 56 transmits shear force between the column 50 and the concrete 60. The headed stud 56 is an example of a shear connector.

[0037] [Support member 70] As shown in Figures 7(A) and 7(B), the support members 70 are positioned above the headed studs 56 at the lower end of the column 50 and embedded in the filling concrete 60. Furthermore, four support members are provided spaced apart in the circumferential direction of the column 50. Specifically, a pair of support members 70 are provided on either side of the column 50 in the depth direction, and a pair of support members 70 are provided on either side of the column 50 in the width direction.

[0038] In the following description, the pair of support members 70 that sandwich the column 50 in the depth direction will be referred to as support member 70a, and the pair of support members 70 that sandwich the column 50 in the width direction will be referred to as support member 70b. Unless otherwise specified, they will be referred to as support member 70.

[0039] -Support member 70a- As shown in Figures 7(A)(B) and 9, the support member 70a comprises a support plate 72a, an adjustment plate 74a, a bolt 76a, and a nut 78a.

[0040] The support plate 72a has a rectangular shape when viewed from the width direction, with the thickness direction being the width direction. One end edge of the support plate 72a is attached to the inner circumferential surface 30b of the steel pipe 30. The adjustment plate 74a has a rectangular shape when viewed from the width direction, with the thickness direction being the width direction, extending vertically. Furthermore, a flange portion 75a is formed at the lower end of the adjustment plate 74a, where the adjustment plate 74a is bent so that the thickness direction is vertical.

[0041] Furthermore, one end of the adjustment plate 74a is attached to the flange 50a of the column 50. In addition, a portion of the support plate 72a and a portion of the adjustment plate 74a are overlapped in the width direction.

[0042] Furthermore, the support plate 72a and the adjustment plate 74a of this overlapping section are provided with two through holes (not shown) that penetrate both members, spaced apart in the vertical direction. As shown in Figure 9, bolts 76a are inserted into each of the through holes, and nuts 78a are tightened onto the inserted bolts 76a. Here, at least one of the through holes formed in the support plate 72a and the adjustment plate 74a is made larger than the thread diameter of the bolt 76a. This allows the relative position of the support plate 72a and the adjustment plate 74a to be adjusted with the bolt 76a inserted into the through hole.

[0043] -Support member 70b- As shown in Figures 7(A)(B) and 9, the support member 70b comprises a support plate 72b, an adjustment plate 74b, a bolt 76b, a nut 78b, and a rib plate 80.

[0044] The support plate 72b has a rectangular shape when viewed from the depth direction, with its thickness direction being the depth direction. One end edge of the support plate 72b is attached to the inner circumferential surface 30b of the steel pipe 30. The adjustment plate 74b has a rectangular shape when viewed from the depth direction, with its thickness direction being the depth direction. Furthermore, a flange portion 75b is formed at the lower end of the adjustment plate 74b, where the adjustment plate 74b is bent so that its thickness direction is vertical.

[0045] Furthermore, one end of the adjustment plate 74b is attached to the web 50b of the column 50. In addition, a portion of the support plate 72b and a portion of the adjustment plate 74b are overlapped in the width direction.

[0046] Furthermore, four rib plates 80 are provided, and the thickness direction of the rib plates 80 is in the vertical direction. Moreover, when viewed from above, the rib plates 80 are rectangular in shape. One pair of rib plates 80 sandwich the upper end portion of the adjustment plate 74b from the depth direction, and the other pair of rib plates 80 sandwich the lower end portion of the adjustment plate 74b from the depth direction.

[0047] Specifically, one rib plate 80 sandwiching the adjustment plate 74b is sandwiched between the adjustment plate 74b and one flange 50a, and is attached to the adjustment plate 74b and one flange 50a. The other rib plate 80 sandwiching the adjustment plate 74b is sandwiched between the adjustment plate 74b and the other flange 50a, and is attached to the adjustment plate 74b and the other flange 50a.

[0048] Furthermore, in the portion where the support plate 72b and the adjustment plate 74b overlap, the support plate 72b and the adjustment plate 74b are provided with two through holes (not shown) that pass through both members, spaced apart in the vertical direction. As shown in Figure 9, bolts 76b are inserted into each of the through holes, and nuts 78b are tightened onto the inserted bolts 76b.

[0049] Here, at least one of the through holes formed in the support plate 72b and the adjustment plate 74b is made larger than the thread diameter of the bolt 76b. This allows the relative position of the support plate 72b and the adjustment plate 74b to be adjusted when the bolt 76b is inserted into the through hole.

[0050] In this configuration, before concrete is filled into the steel pipe 30, the column 50 is supported by the support member 70. Furthermore, before concrete is filled into the steel pipe 30, the relative position between the support plate 72a and the adjustment plate 74b can be adjusted by the support member 70a. In addition, the relative position between the support plate 72b and the adjustment plate 74b can be adjusted by the support member 70b. In other words, before concrete is filled into the steel pipe 30, the relative position between the steel pipe 30 and the column 50 can be adjusted by the support member 70.

[0051] (summary) As explained above, in the pile-and-column joint structure 10, in a configuration in which the steel pipe 30 supports the column 50 with the support member 70, the relative position of the steel pipe 30 and the column 50 can be adjusted even if the relative position of the steel pipe 30 and the column 50 is misaligned.

[0052] Furthermore, in the pile-and-column joint structure 10, the relative position of the steel pipe 30 with respect to the upper surface 64a of the base portion 64 can be adjusted by an adjustment member 40 attached to the steel pipe 30. This allows the steel pipe 30 to be positioned to extend vertically even if the upper surface 64a of the base portion 64 is inclined with respect to the horizontal plane.

[0053] Furthermore, in the pile-and-column joint structure 10, the adjustment member 40 is positioned below the running surface of a work vehicle traveling alongside the steel pipe 30. This prevents the adjustment member 40 from being damaged by a vehicle traveling alongside the steel pipe 30.

[0054] Furthermore, in the pile-and-column joint structure 10, the headed stud 56 provided at the lower end of the column 50 is positioned below the support member 70. This prevents a decrease in workability caused by the headed stud 56 when adjusting the relative position between the steel pipe 30 and the column 50 from above using the support member 70 before concrete is filled into the steel pipe 30.

[0055] Furthermore, in the pile-and-column joint structure 10, the support member 70a is provided with a flange portion 75a whose thickness direction is vertical, and the support member 70b is provided with a flange portion 75b whose thickness direction is vertical. As a result, when an uplift force is applied to the column 50, the flange portions 75a and 75b can transmit this uplift force to the filling concrete 60.

[0056] Furthermore, in the pile-and-column joint structure 10, the upper end of the pile 20 and the lower end of the column 50 are separated in the vertical direction. Therefore, even if the position of the upper end of the pile 20 varies in the vertical direction, interference between the pile 20 and the lower end of the column 50 can be avoided.

[0057] Furthermore, in the pile-and-column joint structure 10, the pile 20 and the inner surface 30b of the steel pipe 30 are separated in the horizontal direction. This makes it possible to avoid interference between the pile 20 and the inner surface 30b of the steel pipe 30, even if the position of the pile 20 varies in the horizontal direction.

[0058] Although this disclosure has described specific embodiments in detail, it will be apparent to those skilled in the art that this disclosure is not limited to these embodiments, and that various other embodiments are possible within the scope of this disclosure. For example, in the above embodiment, the pile-to-column joint structure 10 was used to connect the column 50 of the portal frame 110 to the pile 20, but it may also be used to connect the column to the pile of a building such as an apartment building or office building.

[0059] Furthermore, in the above embodiment, the pile 20 was a pre-fabricated steel pile installed in the ground, but it may also be a cast-in-place pile.

[0060] Furthermore, although the column 50 was an H-shaped steel beam in the above embodiment, it may also be a square steel pipe or a circular steel pipe, etc. [Explanation of Symbols]

[0061] 10. Joint structure of piles and columns 20 stakes 20a Pile head 22 Headed studs (an example of a shear connector) 30 Steel pipe 40 Adjustment Member 50 pillars 56. Headed stud (an example of a shear connector) 60 Filling concrete 64. Base section (an example of a leveled concrete section) 64a top surface 70 Support member 70a Support member 70b Support member GL running surface

Claims

1. Piles that are installed in the ground, A steel pipe surrounding the pile head at its lower end, A steel column is positioned above the aforementioned pile, and its lower end is enclosed by the upper end of the steel pipe, The steel pipe is filled with concrete, in which the pile head and the lower end portion of the column are embedded, A support member, at least a portion of which is attached to the steel pipe, supports the column on the steel pipe, and allows adjustment of the relative position of the column with respect to the steel pipe, A joint structure for piles and columns equipped with [a specific feature].

2. The steel pipe is erected on the upper surface of the leveling concrete section formed on the ground, The steel pipe is fitted with an adjustment member that allows for adjustment of the relative position of the steel pipe with respect to the upper surface. The pile-and-column joint structure according to claim 1.

3. The steel pipe and the column are installed outdoors. The adjustment member is positioned below the running surface of the work vehicle that travels along the side of the steel pipe. The pile-and-column joint structure according to claim 2.

4. The support member is embedded in the concrete filling, A shear connector is provided at the lower end of the column, which is embedded in the filling concrete and capable of transmitting shear force between the column and the filling concrete. The shear connector is located below the support member. The pile-and-column joint structure according to claim 1.

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