Bridge support structure

Abstract

To realize a structure capable of stabilizing a lower support structure by reducing a load applied to the ground directly under a bridge by the lower support structure.SOLUTION: A lower support structure (10) of the present invention comprises: a box culvert (1) placed in the space between bridge piers (B2) below a bridge (B1); a foamed resin block material (3) positioned directly below the box culvert (1); and an excavation part (G1). The foamed resin block material (3) is placed in the excavation part (G1).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an under-support structure for bridges.

Background Art

[0002] Conventionally, aging bridges have become a social problem. To replace a bridge, first, a temporary bridge is constructed, then the existing bridge is demolished, and a new bridge is constructed and the temporary bridge is disassembled and removed. However, such a method requires a great deal of construction period and cost.

[0003] For this reason, for example, Patent Document 1 proposes a technique for supporting a bridge while sharing a road by using a large box culvert and a filler in combination. Also, as a technique for supporting a bridge while sharing a road, for example, Patent Document 2 proposes a technique for embanking under a bridge by using a foamed resin material such as EPS (expanded polystyrene) and a urethane filler in combination.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the technology described in Patent Document 1 may induce ground subsidence due to the weight of the box culvert and filling material (i.e., the weight of the structure supporting the bridge). Countermeasures against such ground subsidence could include improving the supporting ground of the bridge or constructing pile foundations for the supporting base. However, since the bridge is located directly above the supporting ground, it is difficult to install large heavy machinery on the supporting base, making the above countermeasures challenging. Furthermore, even in the technology described in Patent Document 2, which reinforces the area beneath the bridge using a combination of foamed resin and filling material, the space directly beneath the bridge cannot be effectively utilized, and even though the foamed resin and filling material are lightweight, increased loads still occur.

[0006] One aspect of the present invention aims to provide a bridge support structure that reduces the load on the ground directly beneath the bridge, thereby enabling the structure to withstand future bridge loads without significant deformation. [Means for solving the problem]

[0007] To solve the above problems, a bridge reinforcement structure according to one aspect of the present invention is a bridge support structure that is placed between two abutments, between two piers, or between an abutment and a pier, and comprises a box culvert arranged in the space below the bridge, a foamed resin material arranged either directly above or directly below the box culvert, and a ground excavation section, wherein the lower member of the box culvert and the foamed resin material is arranged in the ground excavation section.

[0008] In the bridge support structure, the foamed resin material may be placed directly beneath the box culvert.

[0009] The bridge support structure may include at least a first filling material that fills the space between the bridge and the box culvert.

[0010] The bridge support structure may include a concrete deck slab placed on the foamed resin material.

[0011] The bridge support structure may include a space for height adjustment formed between the concrete deck and the box culvert, and a second filling material for filling the space.

[0012] To solve the above problems, a method for manufacturing a bridge support structure according to one aspect of the present invention is a method for manufacturing a bridge support structure that is built between two abutments, between two piers, or between an abutment and a pier, and includes: an excavation step of excavating the ground directly beneath the bridge to form a ground excavation section; an arrangement step of placing a first member, either a foamed resin material or a box culvert, in the ground excavation section; and an installation step of installing a second member, either a foamed resin material or a box culvert, which is different from the first member, directly above the first member and in the space below the bridge.

[0013] In the method for manufacturing the bridge support structure, a foamed resin material may be placed as the first member in the arrangement step.

[0014] The method for manufacturing the bridge support structure may include at least a filling step of filling the space between the bridge and the second member with a first filler material. [Effects of the Invention]

[0015] According to one aspect of the present invention, in a bridge support structure that supports a bridge, the support structure reduces the load on the ground directly beneath the bridge, thereby realizing a structure that can withstand future bridge loads without significant deformation. [Brief explanation of the drawing]

[0016] [Figure 1] This diagram shows the configuration of a bridge support structure and a method for manufacturing the support structure according to Embodiment 1 of the present invention. Figures 101 to 103 are schematic front cross-sectional views illustrating various steps in the manufacturing method of the support structure, and figure 104 is a front cross-sectional view and a side cross-sectional view showing the general configuration of the support structure. [Figure 2]Front cross-sectional view and side cross-sectional view showing a schematic configuration of a modified example of the lower support structure according to Embodiment 1 of the present invention. [Figure 3] Front cross-sectional view and side cross-sectional view showing a schematic configuration of the lower support structure according to Embodiment 2 of the present invention. [Figure 4] Front cross-sectional view and side cross-sectional view showing a schematic configuration of the lower support structure according to Embodiment 3 of the present invention. [Figure 5] Front cross-sectional view and side cross-sectional view showing a schematic configuration of the lower support structure according to Embodiment 4 of the present invention. [Figure 6] Front cross-sectional view and side cross-sectional view showing a schematic configuration of the lower support structure according to Embodiment 5 of the present invention. [Figure 7] Front cross-sectional view and side cross-sectional view showing a schematic configuration of the lower support structure according to Embodiment 6 of the present invention. MODE FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to this, and various modifications are possible within the described range. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention. In this specification, unless otherwise specified, "A~B" representing a numerical range means "A or more (including A and greater than A), B or less (including B and less than B)".

[0018] [Embodiment 1] Hereinafter, an embodiment of the present invention will be described in detail. FIG. 1 shows the configuration of the lower support structure 10 of the bridge according to the present embodiment and the manufacturing method of the lower support structure 10. 101 to 103 in FIG. 1 are front cross-sectional views schematically showing various steps of the manufacturing method of the lower support structure 10, and 104 in FIG. 1 is a front cross-sectional view and a side cross-sectional view showing the schematic configuration of the lower support structure 10.

[0019] As shown in 104 of FIG. 1, the bridge B targeted by the lower support structure 10 includes a bridge girder B1 and at least two bridge piers B2, and the bridge girder B1 is configured to be spanned between the bridge piers B2. Here, "between the bridge piers" means not only between one bridge pier B2 and the other bridge pier B2, but also between the abutment and the bridge pier B2, and between one abutment and the other abutment. That is, the bridge girder B1 is spanned between two abutments, between two bridge piers, or between an abutment and a bridge pier. The bridge girder B1 is an existing bridge and is not particularly limited as long as it is used for a conventionally known purpose. The bridge girder B1 may be a road bridge such as a trunk road or a highway, a railway bridge, or a waterway bridge. Also, the material constituting the bridge girder B1 may be concrete or steel.

[0020] The lower support structure 10 is a structure for reinforcing the bridge girder B1 between at least two bridge piers B2. As repair work for the bridge girder B1 that has advanced in aging, work for replacing, repairing, or reinforcing the bridge girder B1 is carried out. For the bridge girder B1, it is necessary to impose traffic restrictions such as long-term traffic stoppage associated with the work. With the lower support structure 10 according to the present embodiment, it is not necessary to remove the existing bridge girder B1, so the bridge girder B1 can be reinforced with a minimum of traffic restrictions.

[0021] The lower support structure 10 includes a box culvert 1, a concrete floor slab 2, a foam resin material block 3 made of a foam resin, and an excavation part G1 (ground excavation part). The box culvert 1 is disposed in the space between the bridge piers B2 below the bridge girder B1. The foam resin material block 3 is disposed in the excavation part G1 and directly below the box culvert 1. Note that the foam resin material block 3 may be disposed directly above the box culvert 1 (see Embodiment 6 below). That is, the foam resin material block 3 is disposed either directly above or directly below the box culvert 1. And, the member disposed on the lower side among the box culvert 1 and the foam resin material block 3 (hereinafter, may also be referred to as the lower member) is disposed in the excavation part G1.

[0022] The configuration referred to here as "placed in the excavation section G1" includes not only configurations in which the lower member is placed directly (in contact with the ground surface G2) relative to the excavation section G1, but also configurations in which the lower member is placed indirectly. When the lower member is a box culvert 1, an example of a configuration in which the lower member is placed indirectly relative to the excavation section G1 is a configuration in which the box culvert 1 is placed on the ground surface G2 via a foundation concrete. When the lower member is a foamed resin block 3, an example of a configuration in which the lower member is placed indirectly relative to the excavation section G1 is a configuration in which the foamed resin block 3 is placed on the ground surface G2 via leveled sand.

[0023] In this specification, "the foamed resin block 3 is positioned either directly above or directly below the box culvert 1" means, by definition, that the foamed resin block 3 is positioned either above or below the box culvert 1 such that, when viewed from above, the laminate of the box culvert 1 and the foamed resin block 3 overlap in at least a portion of the area. When viewed from above, the overlapping area of ​​the laminate of the box culvert 1 and the foamed resin block 3 preferably includes the center of the box culvert 1. The above definitions may be applied to expressions related to "directly below" or "directly above" in this specification (for example, "directly above the foamed resin block 3," "directly below bridge B1," etc.).

[0024] Multiple foamed resin blocks 3 are stacked upwards from the ground. The concrete slab 2 is located directly above the foamed resin blocks 3. That is, as shown at 104 in Figure 1, the concrete slab 2 is positioned between the box culvert 1 and the foamed resin blocks 3. In the support structure 10, an excavation section G1 is formed directly below the box culvert 1. The excavation section G1 has a ground surface G2 on which the foamed resin blocks 3 are installed, forming the installation space for the foamed resin blocks 3. The foamed resin blocks 3 are stacked and arranged on the ground surface G2 of the excavation section G1.

[0025] In the support structure 10, a filling material, as described later, is filled between the bridge B1 and the box culvert 1. Normally, the bridge B1 is supported by the bridge pier B2. However, with the support structure 10 in place, the bridge B1 is supported not only by the bridge pier B2 but also by the box culvert 1 and the filling material. Therefore, the ground G directly beneath the bridge B1 is subjected to an additional load from the box culvert 1 and the filling material, in addition to the load from the bridge pier B2. As a result, the additional load on the ground G may cause the box culvert 1 and the filling material to settle, or cause the bridge B1 to undergo sinking.

[0026] In this embodiment, the support structure 10 for bridge B1 is formed in the ground G directly beneath the bridge B1, and the ground in the excavated section G1 is replaced with a foamed resin block 3. Therefore, the load on the ground surface G2 directly beneath the excavated section G1 can be reduced (cancelled). As a result, in the support structure 10 that supports the bridge B1, the load on the support structure 10 can be reduced, and the ground G directly beneath the support structure 10 can be stabilized. In particular, if the ground G is soft ground, even if the load on the ground surface G2 directly beneath the bridge B1 increases due to the support structure 10, the sinking of the bridge B1 can be suppressed. Thus, according to this embodiment, in the support structure 10 for bridge B1 that supports the bridge B1, the load on the ground directly beneath the bridge B1 can be reduced by the support structure 10, and a structure can be realized that can withstand future loads on the bridge B1 without significant deformation.

[0027] The box culvert 1 is a concrete structure, a cylindrical support frame configured to fit into the space between the bridge beam B1 and the bridge pier B2 of bridge B. According to the under-support structure 10 of this embodiment, since the cylindrical box culvert 1 is positioned directly beneath the bridge beam B1, the space directly beneath the bridge beam B1 can be effectively utilized, for example, for water flow or as a walkway. Furthermore, the under-support structure 10 can be made lighter.

[0028] The box culvert 1 can employ a conventionally known configuration as long as it is designed to fit within the space between bridge B1 and pier B2. The box culvert 1 may be composed of a single precast concrete product, or it may be a composite of multiple precast concrete products formed integrally. It may also be a concrete structure manufactured on-site by assembling formwork.

[0029] The concrete slab 2 is placed on top of the uppermost foamed resin block 3 to adjust for unevenness, distribute load, and reduce buoyancy during construction, in order to install the box culvert 1 on top of the foamed resin block 3. The thickness (vertical direction) of the concrete slab 2 is preferably 100 mm to 300 mm. In addition, to improve strength, the concrete slab 2 preferably has a grid of reinforcing bars embedded inside as a base material. The concrete cover thickness of the reinforcing bars is preferably 40 mm or more from the viewpoint of preventing deterioration due to oxidation of the reinforcing bars. Note that the lower support structure 10 is not limited to a configuration in which the concrete slab 2 is placed on top of the uppermost foamed resin block 3, but may also be a configuration in which intermediate concrete slabs are provided at each height of the foamed resin block 3. In such a configuration, the uppermost concrete slab is provided on the uppermost foamed resin block 3 which is installed on top of the intermediate concrete slabs.

[0030] The foamed resin block 3 is not particularly limited as long as it is made of a material that is lightweight, strong, and flexible, capable of withstanding the loads of the support structure 10 (box culvert 1, etc.), bridge B1, traffic loads, etc. The material of the foamed resin block 3 is preferably, for example, expanded polystyrene (EPS). The support structure 10 is preferably provided as a laminate made by stacking multiple foamed resin blocks 3, for example, each 2 m long, 1 m wide, and 0.5 m thick. This allows the foamed resin block 3 to be easily installed by hand.

[0031] Next, a method for manufacturing the support structure 10 according to this embodiment will be described. The manufacturing method is a method for manufacturing the support structure 10 of a bridge B1 that is suspended between at least two bridge piers B2, and is not particularly limited as long as it includes a placement step of placing a first member, either a foamed resin block 3 or a box culvert 1, directly below the bridge B1, and an installation step of installing a second member, which is different from the first member, from the foamed resin block 3 or the box culvert 1, directly above the first member and in the space below the bridge B1.

[0032] In the following, an example in which the foamed resin block 3 is placed as the first member in the placement step will be described. That is, the manufacturing method of the support structure 10 in this example includes a placement step of placing the foamed resin block 3 directly below the bridge B1, and an installation step of installing the box culvert 1 in the space between the bridge piers B2 directly above the foamed resin block 3 and below the bridge B1. Figures 101 to 103 of Figure 1 show an example of the manufacturing method of the support structure 10.

[0033] In the manufacturing method of the support structure 10, first, as shown in 101 of Figure 1, the ground G directly beneath the box culvert 1 is excavated to form a space (i.e., excavated section G1) for arranging the foamed resin blocks 3 (excavation process). More specifically, in the excavation process, the ground G at the planned installation site of the box culvert 1, directly beneath the bridge B1, is excavated. Any conventionally known excavation technique can be applied to excavate the ground G in the excavation process. In addition, in the excavation process, the ground surface G2 of the excavated section G1 is leveled so that the foamed resin blocks 3 can be arranged horizontally.

[0034] Next, as shown in Figure 1, 102, foamed resin blocks 3 are stacked and arranged on the ground surface G2 of the excavated section G1 formed in the excavation process (arrangement process). In the arrangement process, the foamed resin blocks 3 are laid horizontally without gaps on the leveled ground surface G2 of the excavated section G1. The stacking height of the foamed resin blocks 3 is not particularly limited and may be lower or higher than the ground surface G of the bridge pier B2. For example, the stacking height of the foamed resin blocks 3 is appropriately designed so as to cancel out the increased load of the support structure 10 itself, or the increased load of the support structure 10 and the bridge B1. The foamed resin blocks 3 are fixed together by connecting them with fastening fittings so that they do not shift from one another. In addition, crushed stone or locally generated soil is filled to fill the gaps between the foamed resin blocks 3 and the inclined surface of the excavated section G1.

[0035] Next, as shown in 103 of Figure 1, the concrete floor slab 2 is placed on top of the uppermost foamed resin block 3 (floor slab installation process). In this process, first, reinforcing bars, which are the reinforcing members of the concrete floor slab 2, are placed on top of the uppermost foamed resin block 3. That is, reinforcing bars are placed (reinforcing bar placement process). Reinforcing bars are placed by regularly arranging several tens of millimeters, for example 40 mm, platforms (not shown) on top of the foamed resin block 3, taking into account the concrete cover for the reinforcing bars, and then placing the reinforcing bars on top of them. Subsequently, concrete is poured to a predetermined height and allowed to harden (cured) to form the concrete floor slab 2.

[0036] Next, as shown in 104 of Figure 1, the box culvert 1 is installed on the concrete slab 2 (installation process). In the installation process, the box culvert 1 is positioned so that the bridge B1 and piers B2 and B2 and the walls constituting the hollow portion of the box culvert 1 are in the same direction. In the installation process, it is preferable to install the box culvert 1 on the concrete slab 2 so that a space for height adjustment is formed between the box culvert 1 and the concrete slab 2. After the box culvert 1 is installed, this space for height adjustment is filled with filler material. Any conventionally known method can be used for installing the box culvert 1 on the concrete slab 2. For example, if the box culvert 1 is the concrete secondary product described above, multiple concrete parts may be integrated on the concrete slab 2 to form the box culvert 1. Alternatively, multiple concrete parts may be integrated on the concrete slab 2 in advance on the outside of the concrete slab 2 (a space other than the space directly below the bridge B1) to form the box culvert 1, and then the formed box culvert 1 may be moved onto the concrete slab 2. In this case, the method of moving the box culvert 1 is not particularly limited, and conventionally known methods can be employed. For example, rails may be formed to guide the box culvert 1 to the concrete slab 2, and the box culvert 1 may be moved to the concrete slab 2 along these rails. Alternatively, a sphere or cylinder may be placed directly beneath the box culvert 1, and the box culvert 1 may be moved to the concrete slab 2. An example of a method for moving the box culvert 1 is the method disclosed in Japanese Patent Application Publication No. 2011-102468.

[0037] The support structure 10 manufactured in this manner can reduce the load on the support structure 10 and stabilize the ground G directly beneath it. Furthermore, the support structure 10 enables the development of public transportation infrastructure, such as the repair of aging bridges, thereby contributing to the United Nations-led Sustainable Development Goals (SDGs).

[0038] Figure 2 shows a front cross-sectional view and a side cross-sectional view illustrating the schematic configuration of a modified support structure 10A. The support structure 10A shown in Figure 2 has a configuration in which the space between the bridge B1 and pier B2 and the support structure 10A is filled with filler materials M1 and M2. In addition to the steps described above, the manufacturing method of the support structure 10A includes a filling step of filling at least the space between the bridge B1 and the box culvert 1 with filler material M1.

[0039] As shown in Figure 2, the lower support structure 10A differs from the lower support structure 10 shown in Figure 1 in that it comprises an upper barrier wall 4A, a filler material M1 (first filler material), a middle barrier wall 4B, and a filler material M2 (first filler material). Filler material M1 is a filler material that fills the space between the bridge B1 and the upper surface of the box culvert 1. Filler material M2 is a filler material that covers the sides of the box culvert 1. Furthermore, the upper barrier wall 4A and the middle barrier wall 4B are erected and connected to each other in the vertical direction of the ground G.

[0040] The upper barrier wall 4A defines the space to which the filler material M1 is filled. The middle barrier wall 4B defines the space to which the filler material M2 is filled. The upper barrier wall 4A is formed to surround the space between the bridge B1 and the upper surface of the box culvert 1, and a gap is formed between it and the bridge B1 when viewed from above. Therefore, the filler material M1 is filled through the gap between the bridge B1 and the upper barrier wall 4A when viewed from above.

[0041] Furthermore, the central barrier wall 4B is erected from the ground G and is formed to surround the box culvert 1. The central barrier wall 4B is formed to cover the opening of the box culvert 1. Therefore, the filling material M2 fills the space between the box culvert 1 and the central barrier wall 4B, including the opening of the box culvert 1.

[0042] The filler material M1 is a hardened material such as mortar, foamed lightweight soil, or foamed urethane, which is filled without gaps between the upper surface of the box culvert 1 and the lower surface of the bridge B1. The filler material M2 is the same material as filler material M1. By filling the space between the upper surface of the box culvert 1 and the lower surface of the bridge B1 with filler material M1, the load of the bridge B1 is efficiently transmitted to the box culvert 1. This improves the reinforcing strength of the bridge B1 provided by the box culvert 1. Furthermore, by providing filler material M2 that covers the sides of the box culvert 1, the reinforcing strength of the bridge B1 is further improved.

[0043] The support structure 10 only needs to be equipped with a filler material M1 that fills the space between the bridge B1 and the box culvert 1. Depending on the required reinforcing strength of the support structure 10, filler material M2 may be provided as appropriate. Alternatively, the foamed resin material blocks described above may be used instead of filler material M2.

[0044] [Embodiment 2] Other embodiments of the present invention are described below. For the sake of clarity, components having the same function as those described in the above embodiments will be denoted by the same reference numerals, and their descriptions will not be repeated.

[0045] Figure 3 is a front cross-sectional view and a side cross-sectional view showing the schematic configuration of the support structure 10B according to this embodiment. As shown in Figure 3, the support structure 10B differs from the support structure 10A according to Embodiment 1 in that the filler material M1 is filled only between the bridge B1 and the box culvert 1.

[0046] The upper barrier wall 4C, which defines the space for filling the filler material M1, is erected from the top surface of the box culvert 1 and is in contact with the bottom surface of the bridge B1. In the lower support structure 10B, the filler material M1 is filled over the entire top surface of the box culvert 1.

[0047] Even with the support structure 10B according to this embodiment, the load on the support structure 10B can be reduced, and the ground G directly beneath the support structure 10B can be stabilized. Therefore, according to this embodiment, in the support structure 10B of bridge B1 that supports bridge B1, the load on the ground directly beneath bridge B1 can be reduced by the support structure 10B, and a structure can be realized that can withstand the load of bridge B1 in the future without significant deformation.

[0048] [Embodiment 3] Figure 4 is a front cross-sectional view and a side cross-sectional view showing the schematic configuration of the support structure 10C according to this embodiment. As shown in Figure 4, the support structure 10C differs from the support structure 10A according to Embodiment 1 in that a portion of the space between the bridge B1 and the box culvert 1 is filled with filler material M1.

[0049] As shown in Figure 4, the upper barrier wall 4D, which defines the space for filling with the filler material M1, is erected from the upper surface of the box culvert 1 and is in contact with the lower surface of the bridge B1. Four upper barrier walls 4D are provided on the upper surface of the box culvert 1. As a result, there are two areas for filling with the filler material M1 on the upper surface of the box culvert 1. In the lower support structure 10C, the filler material M1 is filled into two spaces between the bridge B1 and the box culvert 1, which are enclosed by the bridge B1, the box culvert 1, and the upper barrier wall 4D.

[0050] Even with the support structure 10C according to this embodiment, the load on the support structure 10C can be reduced, and the ground G directly beneath the support structure 10C can be stabilized. Therefore, according to this embodiment, in the support structure 10C of bridge B1 that supports bridge B1, the load on the ground directly beneath bridge B1 can be reduced by the support structure 10C, and a structure can be realized that can withstand the load of bridge B1 in the future without significant deformation.

[0051] [Embodiment 4] Figure 5 is a front cross-sectional view and a side cross-sectional view showing the schematic configuration of the support structure 10D according to this embodiment. As shown in Figure 5, the support structure 10D differs from the support structure 10A according to Embodiment 1 in that the space between the box culvert 1 and the concrete slab 2 is filled with a filler material M3 (second filler material).

[0052] As shown in Figure 5, the lower support structure 10D comprises a height adjustment member 2A and a filler material M3. The lower surface of the box culvert 1 and the upper surface of the concrete slab 2 are spaced apart. The height adjustment member 2A defines the space between the lower surface of the box culvert 1 and the upper surface of the concrete slab 2, is erected from the upper surface of the concrete slab 2, and supports the lower surface of the box culvert 1. The space enclosed by the lower surface of the box culvert 1, the lower barrier wall 4E, and the upper surface of the concrete slab 2 is a space for height adjustment to adjust the position of the box culvert 1. For example, the height adjustment members 2A are arranged on all four sides of the concrete slab 2 to adjust the height position of the box culvert 1 and ensure the horizontal shape is secured, after which the filler material M3 is filled into the space.

[0053] Furthermore, any conventionally known method can be used to separate the box culvert 1 from the concrete slab 2. For example, the box culvert 1 and the concrete slab 2 may be separated using jacks.

[0054] Even with the support structure 10D according to this embodiment, the load on the support structure 10D can be reduced, and the ground G directly beneath the support structure 10D can be stabilized. Therefore, according to this embodiment, in the support structure 10D of bridge B1 that supports bridge B1, the load on the ground directly beneath bridge B1 can be reduced by the support structure 10D, and a structure can be realized that can withstand the load of bridge B1 in the future without significant deformation.

[0055] In the configuration shown in Figure 5, no filler material is provided in the space between the underside of bridge B1 and the upper surface of box culvert 1. However, the support structure 10D according to this embodiment is not limited to the configuration shown in Figure 5, and may also be configured in which filler material is provided in the space between the underside of bridge B1 and the upper surface of box culvert 1.

[0056] [Embodiment 5] Figure 6 is a front cross-sectional view and a side cross-sectional view showing the schematic configuration of the support structure 10E according to this embodiment. As shown in Figure 6, the support structure 10E is a structure that supports a bridge constructed on a slope.

[0057] As shown in Figure 6, in the support structure 10E, the filler material M1 is filled only between the bridge B1 and the box culvert 1. The upper barrier wall 4F, which defines the space for filling the filler material M1, is erected from the top surface of the box culvert 1 and is in contact with the bottom surface of the bridge B1. In the support structure 10E, the filler material M1 is filled over the entire top surface of the box culvert 1.

[0058] Furthermore, as shown in Figure 6, the foamed resin block 3 is placed after excavating the inclined surface of the ground G and forming the excavated section G3.

[0059] The wall material 5 is a flat plate-shaped member fixed to the wall side of the foamed resin material block 3, and has the function of enhancing the durability and weather resistance of the lower support structure 10E. The wall material 5 can adopt wall structures implemented in conventional lightweight embankment structures utilizing foamed resin, such as a structure in which extruded cement boards are attached to H-shaped steel or a structure in which fiber-reinforced cement boards are attached to the foamed resin material block 3.

[0060] In this embodiment, the support structure 10E has the effect of reducing the load on the excavated section G3 directly beneath the bridge B1.

[0061] [Embodiment 6] Figure 7 is a front cross-sectional view and a side cross-sectional view showing the schematic configuration of the support structure 10F according to this embodiment. As shown in Figure 7, the support structure 10F differs from the support structure 10A according to Embodiment 1 in that the foamed resin material block 3 is positioned directly above the box culvert 1.

[0062] As shown in Figure 7, in the support structure 10F, the box culvert 1 is embedded in the ground G. Multiple foamed resin blocks 3 are stacked upwards from the top surface of the box culvert 1. The concrete floor slab 2 is located directly above the foamed resin blocks 3.

[0063] Furthermore, the wall material 5 is erected above the ground G and fixed to the wall side of the foamed resin block 3. The wall material 5 is in contact with the underside of the bridge B1.

[0064] The filler material M1 is filled into the space formed by the underside of the bridge B1, the concrete deck slab 2, and the wall material 5.

[0065] Even with the support structure 10F according to this embodiment, the load on the support structure 10F can be reduced, and the ground G directly beneath the support structure 10F can be stabilized. Therefore, according to this embodiment, in the support structure 10F of bridge B1 that supports bridge B1, the load on the ground directly beneath bridge B1 can be reduced by the support structure 10F, and a structure can be realized that can withstand the load of bridge B1 in the future without significant deformation.

[0066] Furthermore, in the manufacturing method according to Embodiment 1, foamed resin material blocks 3 were stacked and arranged in the excavated section G1 formed in the excavation step during the placement step. However, in the placement step, it is sufficient to place either the foamed resin material or the box culvert as the first member in the excavated section, and in particular, in the manufacturing method according to this embodiment, the box culvert 1 is placed as the first member. That is, the manufacturing method of the lower support structure 10F according to this embodiment includes a placement step of placing the box culvert 1 in the excavated section below the bridge B1, and an installation step of installing the foamed resin material blocks 3 directly above the box culvert 1 and in the space between the bridge piers B2 below the bridge B1.

[0067] Furthermore, the lower support structure 10F according to this embodiment is preferably used when a box culvert 1 is used for underground drainage or the like.

[0068] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0069] 1 Box Culvert 2. Concrete slab 3. Foamed resin block (foamed resin material) 10, 10A, 10B, 10C, 10D, 10E, 10F Under-support structure B1 Bridge B2 pier G Ground G1 Excavation Section (Ground Excavation Section) G3 Excavation Section (Ground Excavation Section on an Inclined Surface) M1, M2 filler (first filler) M3 filler (second filler)

Claims

1. A bridge support structure that is placed between two abutments, between two piers, or between an abutment and a pier, A box culvert is located in the space below the aforementioned bridge, A foamed resin material positioned directly beneath the aforementioned box culvert, Ground excavation section, The system comprises a concrete floor slab placed on the foamed resin material, The box culvert and the foamed resin material, of which the foamed resin material is placed in the ground excavation section, A bridge support structure in which the ground in the excavated area is replaced with the foamed resin material.

2. A bridge support structure that is placed between two abutments, between two piers, or between an abutment and a pier, A box culvert is located in the space below the aforementioned bridge, A foamed resin material positioned directly below the box culvert, and Ground excavation section, The system comprises a concrete floor slab placed on the foamed resin material, The box culvert and the foamed resin material, of which the foamed resin material is placed in the ground excavation section, A bridge support structure in which the ground in the excavated area is replaced with the foamed resin material.

3. The bridge support structure according to claim 1 or 2, further comprising a first filler material that fills the space between at least the bridge and the box culvert or the foamed resin material.

4. A space for height adjustment is formed between the concrete slab and the box culvert, A bridge support structure according to claim 1 or 2, comprising a second filling material for filling the aforementioned space.

5. A method for manufacturing a bridge support structure that is placed between two abutments, between two piers, or between an abutment and a pier, The excavation process involves excavating the ground directly beneath the bridge to form the excavated section, The arrangement step involves placing the foamed resin material, of which the foamed resin material and box culvert are placed in the excavated ground area, and replacing the ground that was in the excavated ground area with the foamed resin material. A floor slab installation process, in which a concrete floor slab is installed on the aforementioned foamed resin material, A method for manufacturing a bridge support structure, comprising: an installation step of installing a box culvert among the foamed resin material and the box culvert directly above the foamed resin material and in the space below the bridge.

6. A method for manufacturing a bridge support structure according to claim 5, comprising a filling step of filling a first filler material between at least the bridge and the box culvert.

Images