Underground structure support structure

Abstract

To reduce the influence of seismic force on an adjacent underground structure while dispensing with a pile foundation for supporting a cylindrical underground structure.SOLUTION: The underground structure support structure includes an adjacent underground structure 20 and a cylindrical underground structure 50 which is buried in the ground between the adjacent underground structures 20, is supported by the underground structure 20, and forms an underground space 30 connecting the underground structures 20, and at least one of the adjacent underground structures 20 has a support portion 36 which is inserted into the underground space 30 of the cylindrical underground structure 50 and slidably supports a top wall portion 50U of the cylindrical underground structure 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to underground structure support structures. [Background technology]

[0002] BACKGROUND ART Support structures for underground structures buried in the ground are known (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-297807 [Patent Document 2] Japanese Patent Application Publication No. 4-131430 [Patent Document 3] Japanese Patent Application Publication No. 10-131209 Summary of the Invention [Problem to be solved by the invention]

[0004] It is possible to form an underground space connecting adjacent underground structures by burying an underground structure between them. In this case, if the underground structure is connected to the adjacent underground structures, during an earthquake, seismic force will be transmitted between the adjacent underground structures via the underground structure, which may increase the impact of the seismic force on the adjacent underground structures.

[0005] In response to this, for example, it is conceivable to structurally separate an underground structure from adjacent underground structures and support the underground structure with pile foundations, etc. In this case, during an earthquake, the transmission of seismic force between adjacent underground structures via the underground structure is suppressed, thereby reducing the impact of the seismic performance of the adjacent underground structures.

[0006] However, construction of pile foundations is time-consuming.

[0007] In consideration of the above, the present invention aims to reduce the impact of seismic forces on adjacent underground structures while eliminating the need for pile foundations to support tubular underground structures. [Means for solving the problem]

[0008] The underground structure support structure described in claim 1 comprises adjacent underground structures and a tubular underground structure buried in the ground between the adjacent underground structures, supported by the underground structures, and forming an underground space connecting the underground structures, and at least one of the adjacent underground structures has a support portion inserted into the underground space of the tubular underground structure and slidably supporting the ceiling wall portion of the tubular underground structure.

[0009] According to the underground structure support structure of claim 1, a tubular underground structure is buried in the ground between adjacent underground structures. The tubular underground structure forms an underground space connecting the adjacent underground structures. For example, wiring and piping connecting the adjacent underground structures can be laid in this underground space.

[0010] Furthermore, the tubular underground structure is supported by adjacent underground structures, which makes it possible to omit pile foundations that support the tubular underground structure.

[0011] Furthermore, at least one of the adjacent underground structures has a support portion. The support portion is inserted into the underground space of the tubular underground structure and slidably supports the top wall portion of the tubular underground structure. As a result, during an earthquake, the top wall portion of the tubular underground structure slides relative to the support portion, thereby suppressing the transmission of seismic force between the adjacent underground structures via the tubular underground structure.

[0012] In this way, the present invention can reduce the impact of earthquake forces on adjacent underground structures while eliminating the need for pile foundations to support the tubular underground structure.

[0013] The underground structure support structure described in claim 2 is the underground structure support structure described in claim 1, in which at least one of the adjacent underground structures and the bottom wall portion of the tubular underground structure are connected by a stopper member.

[0014] According to the underground structure support structure of claim 2, at least one of the adjacent underground structures and the bottom wall of the tubular underground structure are connected by a shear stopper member, which can prevent the underground structure and the tubular underground structure from shifting during an earthquake.

[0015] The underground structure support structure described in claim 3 is the underground structure support structure described in claim 1 or claim 2, in which adjacent underground structures are pile foundations and the tubular underground structure is supported on soft ground.

[0016] According to the underground structure support structure of claim 3, adjacent underground structures are pile foundations. Meanwhile, the tubular underground structure is supported on soft ground. In this case, there is a possibility that the tubular underground structure may sink.

[0017] The present invention is particularly effective in such cases, and by supporting the tubular underground structure with adjacent underground structures, the tubular underground structure is supported by the pile foundations of the adjacent underground structures. Therefore, it is possible to suppress subsidence of the tubular underground structure while eliminating the need for pile foundations to support the tubular underground structure.

[0018] Furthermore, by slidably supporting the top wall portion of the tubular underground structure by the support portion of the underground structure, the effect of earthquake forces on adjacent underground structures can be reduced. [Effects of the Invention]

[0019] As described above, according to the present invention, it is possible to reduce the effect of earthquake forces on adjacent underground structures while eliminating the need for pile foundations to support the tubular underground structure. [Brief explanation of the drawings]

[0020] [Figure 1] A vertical cross-sectional view showing two structures and a tubular underground structure to which an underground structure support structure according to one embodiment is applied. [Figure 2] 2 is an enlarged cross-sectional view of a portion of FIG. 1 showing a support part according to one embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] 2 is a partially enlarged cross-sectional view of FIG. 1 showing a stopper member according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment will be described with reference to the drawings.

[0022] (structure) Figure 1 shows two structures 10 and a tubular underground structure 50 to which the underground structure support structure of this embodiment is applied. The two structures 10 and the tubular underground structure 50 are provided on the ground G. As an example, the ground G is soft ground.

[0023] The two structures 10 are placed at a distance from each other on soft ground G. In addition, the two structures 10 are, as an example, pile foundations. Each structure 10 includes an underground structure 20 and an aboveground structure 40.

[0024] In this embodiment, the two structures 10 have the same configuration. Therefore, the configuration of one of the structures 10 will be described below, and the description of the configuration of the other structure 10 will be omitted as appropriate.

[0025] The underground structure 20 is, for example, an underground pit (trench pit) and is provided underground by excavating the ground G. The underground structure 20 includes, for example, a foundation slab 22, a foundation beam 28, and a slab 34.

[0026] The underground structure 20 is not limited to an underground pit, but may be, for example, an underground seismic isolation layer, a basement, an underground parking lot, or the like.

[0027] The foundation slab 22 is made of reinforced concrete and has multiple slab reinforcements (not shown) buried inside. The foundation slab 22 is installed along the bottom of an excavation in the ground G, and is supported by piles 26 via footings 24. A foundation beam 28 is installed on the foundation slab 22.

[0028] The foundation beams 28 are, for example, made of reinforced concrete, and have a plurality of main beam reinforcements and shear reinforcement bars (not shown) embedded inside. The foundation beams 28 are provided along the outer periphery of the foundation slab 22, and define the underground space 30 of the underground structure 20. The outer surfaces of the foundation beams 28 form the outer wall surface 20A of the underground structure 20. The foundation beams 28 support the outer periphery of the slab 34.

[0029] The slab 34 is made of reinforced concrete and has a plurality of slab reinforcements (not shown) buried inside. The slab 34 is placed above the foundation slab 22 and constitutes the first floor of the structure 10 (above-ground structure 40).

[0030] Of the adjacent underground structures 20, an opening 32 is formed in the foundation beam 28 of one of the underground structures 20, which leads to the underground space 30 of the tubular underground structure 50 described below. The opening 32 may be provided as needed and may be omitted as appropriate.

[0031] An above-ground structure 40 is provided on the underground structure 20. The above-ground structure 40 has columns, beams, an exterior wall 42, etc. (not shown). The exterior wall 42 rises upward from the foundation beam 28 and is located above ground.

[0032] The configuration of the structure 10 can be changed as appropriate. Furthermore, the structure 10 only needs to include at least the underground structure 20, and the aboveground structure 40 can be omitted as appropriate.

[0033] (Cylindrical underground structure) A cylindrical underground structure 50 is buried in the ground G between adjacent underground structures 20, forming an underground space 30 connecting these underground structures 20. The cylindrical underground structure 50 is formed by a box culvert, for example. Specifically, the cylindrical underground structure 50 is formed from concrete into a cylindrical shape with a rectangular cross section, with both ends in the axial direction (arrow X direction) open.

[0034] The cylindrical underground structure 50 is arranged with the opposing direction of the outer wall surfaces 20A of adjacent underground structures 20 as the axial direction. Also, as shown in Figure 2, the cylindrical underground structure 50 is arranged with the end faces 50E on both axial sides opposing the outer wall surfaces 20A of adjacent underground structures 20. A gap P is formed between the end faces 50E of this cylindrical underground structure 50 and the outer wall surfaces 20A of the underground structure 20.

[0035] In addition, a water-stopping member or the like may be provided in the gap P between the end surface 50E of the cylindrical underground structure 50 and the outer wall surface 20A of the underground structure 20.

[0036] 3, the cylindrical underground structure 50 has a pair of opposing side walls 50S, a bottom wall 50L connecting the lower ends of the pair of side walls 50S, and a top wall 50U connecting the upper ends of the pair of side walls 50S. An underground space 30 is formed inside the cylindrical underground structure 50.

[0037] The underground space 30 is connected to openings 32 of adjacent underground structures 20, through holes (not shown), etc. In this underground space 30, for example, wiring, piping, etc. that connect the adjacent underground structures 20 are laid.

[0038] The cylindrical underground structure 50 is supported by the adjacent underground structure 20 so as to be slidable in two horizontal directions. Specifically, a support portion 36 is provided on the outer wall surface 20A of the underground structure 20. The support portion 36 is, for example, made of reinforced concrete, and has reinforcing bars and the like (not shown) buried inside.

[0039] The support portion 36 is not limited to being made of reinforced concrete, but may be made of, for example, steel-framed reinforced concrete or steel-framed construction.

[0040] The support portion protrudes from the outer wall surface 20A of the underground structure 20 along the lower surface 50U1 of the top wall portion 50U of the tubular underground structure 50 and is inserted into the underground space 30 of the tubular underground structure 50.

[0041] The support portion 36 is formed to have a rectangular cross section. A lower surface 50U1 of a top wall portion 50U of the cylindrical underground structure 50 is placed on an upper surface 36U of the support portion 36 so as to be slidable in two horizontal directions.

[0042] In addition, at least one of the upper surface 36U of the support portion 36 and the lower surface 50U1 of the top wall portion 50U of the tubular underground structure 50 may be provided with a sliding material, paint, etc. to adjust the sliding amount (friction coefficient) of the top wall portion 50U of the tubular underground structure 50, or may be subjected to roughening treatment.

[0043] 2, the support portion 36 is formed in a eave-like (rod-like) shape extending in the width direction of the cylindrical underground structure 50. The support portion 36 also extends from one end side to the other end side in the width direction of the underground space 30.

[0044] The end faces 36E on both sides of the support portion 36 face the inner wall surfaces 50S1 of the side wall portions 50S on both sides of the cylindrical underground structure 50. A gap Q is formed between the end faces 36E of the support portion 36 and the side wall portions 50S of the cylindrical underground structure 50.

[0045] In addition, a water-stopping member or the like may be provided in the gap Q between the cylindrical underground structure 50 and the side wall portion 50S.

[0046] (Slip-preventing member) As shown in Figure 4, adjacent underground structures 20 and the tubular underground structure 50 are connected by a plurality of anti-slip members 60. The plurality of anti-slip members 60 are arranged at intervals in the width direction of the tubular underground structure 50 (the direction of arrow W in Figure 3).

[0047] As an example, the plurality of shear stop members 60 are slip bars. Specifically, the plurality of shear stop members 60 are formed of reinforcing bars that have been subjected to an unbonding process on one end side 60A to prevent adhesion to the concrete. Each shear stop member 60 is embedded between the underground structure 20 and the bottom wall portion 50L of the tubular underground structure 50.

[0048] In this embodiment, one end 60A of the shear stopper member 60 is embedded in the bottom wall portion 50L of the tubular underground structure 50, and the other end 60B of the shear stopper member 60 is embedded in the foundation slab 22 of the underground structure 20. However, one end 60A of the shear stopper member 60 may be embedded in the foundation slab 22 of the underground structure 20, and the other end 60B of the shear stopper member 60 may be embedded in the bottom wall portion 50L of the tubular underground structure 50.

[0049] The multiple anti-slip members 60 restrain the lateral displacement of the tubular underground structure 50 relative to the adjacent underground structure 20. On the other hand, the multiple anti-slip members 60 allow the tubular underground structure 50 to move axially relative to the adjacent underground structure 20 by sliding the unbonded one end side 60A relative to the bottom wall portion 50L of the tubular underground structure 50 in the axial direction.

[0050] The anti-slip member 60 is not limited to a slip bar and can be modified as appropriate.

[0051] (action) Next, the operation of this embodiment will be described.

[0052] As shown in Figure 1, according to the underground structure support structure of this embodiment, a tubular underground structure 50 is buried in the ground G between adjacent underground structures 20. The tubular underground structure 50 forms an underground space 30 that connects the adjacent underground structures 20. In this underground space 30, for example, wiring and piping that connect the adjacent underground structures 20 can be laid.

[0053] Furthermore, the tubular underground structure 50 is supported by the adjacent underground structures 20. This makes it possible to omit the pile foundation that supports the tubular underground structure 50.

[0054] Furthermore, adjacent underground structures 20 have support portions 36. The support portions 36 are inserted into the underground space 30 of the tubular underground structure 50, and support the top wall portions 50U of the tubular underground structure 50 in a slidable manner.

[0055] As a result, during an earthquake, the top wall portion 50U of the tubular underground structure 50 slides relative to the support portion 36, thereby suppressing the transmission of seismic force between adjacent underground structures 20 via the tubular underground structure 50. Therefore, the effect of seismic force on adjacent underground structures 20 can be reduced.

[0056] In this way, in this embodiment, the pile foundation for supporting the tubular underground structure 50 is not required, and the effect of earthquake forces on adjacent underground structures 20 can be reduced.

[0057] 4, in this embodiment, adjacent underground structures 20 and the bottom wall portion 50L of the tubular underground structure 50 are each connected by a plurality of anti-slip members 60. These anti-slip members 60 prevent the underground structures 20 and the tubular underground structure 50 from shifting in the width direction of the tubular underground structure 50 during an earthquake.

[0058] On the other hand, one end side 60A of the unbonded shear stopper member 60 is made axially slidable relative to the bottom wall portion 50L of the tubular underground structure 50. This prevents the transmission of seismic force between the adjacent underground structures 20 and the tubular underground structure 50.

[0059] Furthermore, in this embodiment, adjacent underground structures 20 are pile foundations. On the other hand, the tubular underground structure 50 is supported on soft ground G. In this case, there is a possibility that the tubular underground structure 50 may sink.

[0060] In such cases, this embodiment is particularly effective, and by supporting the tubular underground structure 50 by adjacent underground structures 20, the tubular underground structure 50 is supported by the piles 26 of the adjacent underground structures 20. Therefore, it is possible to suppress subsidence of the tubular underground structure 50 while eliminating the need for a pile foundation to support the tubular underground structure 50.

[0061] Furthermore, as mentioned above, by slidably supporting the ceiling wall portion 50U of the tubular underground structure 50 by the support portions 36 of adjacent underground structures 20, the effect of seismic forces on adjacent underground structures 20 can be reduced.

[0062] (Variation) Next, a modification of the above embodiment will be described.

[0063] In the above embodiment, adjacent underground structures 20 and the bottom wall portion 50L of the tubular underground structure 50 are each connected by a shear stopper member 60. However, it is also possible to connect one of adjacent underground structures 20 and the bottom wall portion 50L of the tubular underground structure 50 by a shear stopper member 60, without connecting the other adjacent underground structure 20 and the bottom wall portion 50L of the tubular underground structure 50 by a shear stopper member 60. In other words, the shear stopper member 60 can connect at least one of adjacent underground structures 20 and the bottom wall portion 50L of the tubular underground structure 50.

[0064] Furthermore, the anti-slip member 60 is not limited to the bottom wall portion 50L of the tubular underground structure 50, but may also, for example, connect the side wall portion 50S or the top wall portion 50U of the tubular underground structure 50 to the underground structure 20. Furthermore, the anti-slip member 60 may be provided on the underground structure 20 and the tubular underground structure 50 as necessary, and may be omitted as appropriate.

[0065] Furthermore, in the above embodiment, a support portion 36 is provided on each of the adjacent underground structures 20. However, the support portion 36 may be provided on one of the adjacent underground structures 20, and the other adjacent underground structure 20 may be joined (rigidly joined) to the tubular underground structure 50. In other words, the support portion 36 may be provided on at least one of the adjacent underground structures 20.

[0066] In addition, in the above embodiment, the adjacent underground structures 20 are pile foundations. However, the adjacent underground structures 20 are not limited to pile foundations. For example, if the adjacent underground structures 20 are supported by hard ground, the adjacent underground structures 20 may be, for example, spread foundations.

[0067] In addition, in the above embodiment, adjacent underground structures 20 have the same configuration. However, the configurations of adjacent underground structures 20 may be different.

[0068] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0069] 20 Underground structures 36 Support part 50 Cylindrical underground structure 50L bottom wall 50U ceiling wall 60 Shear stopper G Ground

Claims

1. Adjacent underground structures and a cylindrical underground structure that is buried in the ground between adjacent underground structures, is supported by the underground structures, and forms an underground space connecting the underground structures; Equipped with At least one of the adjacent underground structures has a support portion that is inserted into the underground space of the cylindrical underground structure and slidably supports a ceiling wall portion of the cylindrical underground structure. Underground structure support structure.

2. At least one of the adjacent underground structures and the bottom wall portion of the tubular underground structure are connected by a stopper member. The underground structure support structure of claim 1 .

3. The adjacent underground structures are pile foundations, The cylindrical underground structure is supported on soft ground. The underground structure support structure according to claim 1 or 2.

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