Bridge manufacturing method and bridge

Abstract

To improve the durability of a floor slab in a bridge.SOLUTION: The method for manufacturing a bridge 10 comprises: a foam resin layer formation step of directly injecting a foam resin raw material into a soil surface positioned below a floor slab 14 of the bridge 10 and forming a foam resin layer 20; and a concrete layer formation step of injecting concrete from a hole 26 bored in the floor slab 14 and forming a concrete layer 22 between the floor slab 14 and the foam resin layer 20. The hole 26 is filled with the concrete of the concrete layer 22.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a method for manufacturing a bridge and a bridge.

Background Art

[0002] In structures such as bridges, it has been proposed to reinforce by providing a rigid urethane foam layer on the lower side of the floor slab (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Local loads may be applied to the floor slab from the wheels of vehicles passing over the floor slab. In consideration of such local loads applied to the floor slab, it is required to improve the durability of the floor slab.

[0005] In view of the above problems related to the prior art, the present invention has been proposed to preferably solve these problems, and an object thereof is to provide a method for manufacturing a bridge and a bridge with improved durability of the floor slab.

Means for Solving the Problems

[0006] A first aspect of the method for manufacturing a bridge according to the present invention is a foamed resin layer forming step of directly injecting a foamed resin raw material onto the soil surface located on the lower side of the floor slab of the bridge to form a foamed resin layer, and a concrete layer forming step of filling the holes made in the floor slab with concrete to form a concrete layer between the floor slab and the foamed resin layer, and the gist thereof is to include these steps.

[0007] The second aspect of the method for manufacturing a bridge according to the present invention is that, in the first aspect of the manufacturing method, Before the concrete layer forming step, a sheet joining step of joining a sheet containing inorganic fibers or metal to the lower surface of the slab may be further provided.

[0008] The third aspect of the method for manufacturing a bridge according to the present invention is that, in the first aspect or the second aspect of the manufacturing method, Before the concrete layer forming step, a reinforcing bar installation step of assembling reinforcing bars and installing them between the slab and the foamed resin layer may be further provided.

[0009] The first aspect of the bridge according to the present invention is a slab of a bridge, a foamed resin layer disposed below the slab, a concrete layer disposed between the slab and the foamed resin layer, and a sheet layer containing inorganic fibers or metal disposed on the lower surface of the slab, and holes penetrating in the vertical direction are formed in the slab and the sheet layer, and the gist is that the holes are filled with the concrete of the concrete layer.

[0010] The second aspect of the bridge according to the present invention is a slab of a bridge, a foamed resin layer disposed below the slab, and a reinforced concrete layer disposed between the slab and the foamed resin layer, and holes penetrating in the vertical direction are formed in the slab, and the gist is that the holes are filled with the concrete of the reinforced concrete layer.

Advantages of the Invention

[0011] According to the method for manufacturing a bridge according to the present invention, a bridge having a slab with improved durability can be obtained. According to the bridge according to the present invention, the durability of the slab can be improved.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0013] Next, a manufacturing method of a bridge according to the present invention will be described below with reference to the accompanying drawings by giving preferred embodiments. Note that the embodiments and drawings described below are examples of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations, and can be appropriately changed without departing from the gist of the present invention.

Embodiment

[0014] As shown in FIG. 1, a bridge 10 according to an embodiment includes a floor slab 14, a foamed resin layer 20 disposed below the floor slab 14, a concrete layer 22 disposed between the floor slab 14 and the foamed resin layer 20, and a sheet layer 24 disposed on the lower surface of the floor slab 14. The floor slab 14 is supported by a substructure 12, which is a structure supported by the ground such as a pier or an abutment via a bridge girder (not shown). The substructure 12 and the floor slab 14 are made of reinforced concrete. On the upper surface of the floor slab 14, a pavement 18 such as asphalt or concrete is disposed. Loads such as local wheel loads may be applied to the floor slab 14 from vehicles passing on the pavement 18. Here, the wheel load refers to a vertical load applied to the pavement surface through one wheel of a vehicle. Further, when damage occurs in the existing floor slab 14, a load called a local eccentric load may be applied to the floor slab 14.

[0015] The foamed resin layer 20 receives the load applied to the floor slab 14 through the sheet layer 24 and the concrete layer 22. By passing through the sheet layer 24 and the concrete layer 22, the load applied to the floor slab 14 is dispersed and transmitted to the foamed resin layer 20. The foamed resin layer 20 is a lightweight embankment formed of a foamed resin such as polyurethane foam. Since the specific gravity of the foamed resin layer 20 is smaller than that of soil, the load on the ground is smaller than that of an embankment made of soil. Here, if the foamed resin layer 20 is formed of polyurethane foam, for example, on-site foamed polyurethane foam that is foamed and cured at the construction site may be used. On-site foamed polyurethane foam is suitable from the viewpoints of light weight, workability, adhesiveness to the substructure 12, etc. The foamed resin layer 20 is preferably arranged so as to contact the soil surface (ground surface) located below the floor slab 14, and no other structures such as blocks are interposed between the foamed resin layer 20 and the soil surface, so that the foamed resin layer 20 is directly supported by the ground, thereby stabilizing it or making it easier to disperse the upper load to the ground. Further, the foamed resin layer 20 is preferably a single unit as a whole block, rather than an aggregate formed by stacking blocks, for example. In addition, the foamed resin layer 20 may be formed by injecting the foamed resin in multiple portions, but even in this case, it is integrated by the self-adhesiveness of the foamed resins, so the foamed resin layer 20 is regarded as a single-block structure.

[0016] The foamed resin layer 20 may be formed with the same strength as a whole, or the strength may be changed in the vertical direction, such as making the upper part of the foamed resin layer 20 have a higher strength than the lower part. Further, the strength may be changed in the horizontal direction of the foamed resin layer 20 according to the shape of the floor slab 14 located above the foamed resin layer 20. The compressive strength (JIS A9511) of the foamed resin layer 20 is not particularly limited, but it is preferably, for example, 120 kN / m 2 or more, and for example, 120 kN / m 2 ~400 kN / m 2 is set in the range. The density (JIS A9511) of the foamed resin layer 20 is not particularly limited, but for example, 36 ± 4 kg / m3 It may be within the range of values adjusted according to the above-described compressive strength from the degree.

[0017] The concrete layer 22 receives the load applied to the floor slab 14 directly or via the sheet layer 24, and disperses the load to the foamed resin layer 20. As shown in FIG. 1, the concrete layer 22 is preferably disposed over the entire upper side of the foamed resin layer 20. Further, it is preferable that the entire lower surface of the concrete layer 22 is in contact with the foamed resin layer 20. The concrete layer 22 is preferably disposed over the entire lower side of the floor slab 14. Also, the upper surface of the concrete layer 22 may be formed horizontally (see FIGS. 2(a) and (d)), or may be formed in an uneven shape conforming to the uneven shape such as the beam 16 formed on the lower surface of the floor slab 14 (see FIGS. 2(b) and (c)). The concrete layer 22 preferably receives the load from the entire lower surface of the floor slab 14 (see FIGS. 2(a) to (c)), but may receive the load from a part of the lower surface of the floor slab 14 (for example, the beam 16) (see FIG. 2(d)).

[0018] The concrete layer 22 may be either reinforced concrete in which reinforcing bars 22a (see FIG. 2) are disposed inside, or unreinforced concrete in which no reinforcing bars 22a are disposed inside. As the concrete layer 22, reinforced concrete is preferable because the tensile strength is increased, and the load applied from the floor slab 14 to the concrete layer 22 can be efficiently dispersed to the foamed resin layer 20. As the type of concrete for the concrete layer 22, ordinary concrete, lightweight concrete, high-strength concrete, fluidized concrete, high-fluidity concrete, mass concrete, etc. can be used. Among these, high-fluidity concrete is preferable because it is easy to fill the space between the floor slab 14 and the foamed resin layer 20 with concrete.

[0019] The thickness of the concrete layer 22 is not particularly limited, but for example, setting it to about 250 mm to 450 mm is preferable because the load applied from the floor slab 14 can be appropriately dispersed to the foamed resin layer 20 and the load on the foamed resin layer 20 applied by the concrete layer 22 itself can be reduced. If the compressive strength of the concrete layer 22 is set higher than the compressive strength of the foamed resin layer 20, it is preferable because the load applied from the floor slab 14 can be appropriately dispersed to the foamed resin layer 20. Also, if the tensile strength of the concrete layer 22 is set higher than the tensile strength of the foamed resin layer 20, it is preferable because the load applied from the floor slab 14 can be appropriately dispersed to the foamed resin layer 20.

[0020] The concrete layer 22 may contain fiber-based reinforcing materials such as glass fibers, inorganic fibers such as carbon fibers other than glass fibers, organic fibers such as polypropylene, and other reinforcing materials. Among these, the fiber-based reinforcing materials can improve the tensile strength of the concrete layer 22, so the load dispersibility can be improved. Also, the concrete layer 22 may contain admixtures such as fly ash, silica fume, rock powder, expansive agent, blast furnace slag fine powder, and additives such as admixtures such as water reducing agent, AE agent, AE water reducing agent, retarder, accelerator, flash setting agent, foaming agent, rust inhibitor for steel bar protection, and drying shrinkage reducing agent.

[0021] The sheet layer 24 reinforces the floor slab 14 against the load. The sheet layer 24 is preferably joined to the lower surface of the floor slab 14, and by directly joining with the floor slab 14, the reinforcing effect of the floor slab 14 by the sheet layer 24 can be improved. Although it is preferable that the entire sheet layer 24 is joined to the floor slab 14 (see FIGS. 2(a) to (c)), it is not limited thereto. For example, a part of the sheet layer 24 may be joined to the floor slab 14 and the remaining part of the sheet layer 24 may be arranged away from the floor slab 14 (see FIG. 2(d)), or the floor slab 14 may be reinforced by the sheet layer 24 via a layer (for example, the beam 16) arranged between the floor slab 14 and the sheet layer 24 (see FIG. 2(d)).

[0022] The sheet layer 24 is preferably disposed over the entire lower surface of the floor slab 14 (see Fig. 2(a)). However, the present invention is not limited thereto, and the sheet layer 24 may be disposed only over a partial range of the lower surface of the floor slab 14. Further, the sheet layer 24 is preferably disposed with unevenness following the uneven shape such as the beam 16 on the lower surface of the floor slab 14 (see Fig. 2(b)). Furthermore, when there is an uneven shape such as the beam 16 on the lower surface of the floor slab 14, the sheet layer 24 may be disposed in the concave portion of the lower surface of the floor slab 14 (see Fig. 2(c)), or the sheet layer 24 may be disposed so as to span between the beams 16 (protrusions) on the lower surface of the floor slab 14 (see Fig. 2(d)). Note that the sheet layer 24 may be disposed not only under the floor slab 14 but also under these including the floor slab 14 and the bridge girder. Note that the beam 16 may be a structure included in a part of the floor slab 14, or the beam 16 and the floor slab 14 may be separate structures.

[0023] The sheet layer 24 preferably has excellent tensile strength in the direction along the lower surface of the floor slab 14 (hereinafter referred to as the surface direction). Here, the sheet layer 24 preferably has a tensile strength in the surface direction greater than that of the foamed resin layer 20, and more preferably greater than that of the concrete layer 22. Thus, when the tensile strength in the surface direction of the sheet layer 24 is greater than the tensile strength in the surface direction of the foamed resin layer 20, the load applied from the floor slab 14 can be appropriately dispersed to the concrete layer 22 and the foamed resin layer 20. Note that the thickness of the sheet layer 24 is not particularly limited, but it may be set to the minimum thickness capable of ensuring a tensile strength capable of reinforcing the floor slab 14, so that the weight can be reduced.

[0024] The sheet layer 24 is formed of a sheet S (see Fig. 4(a)) containing inorganic fibers or metal. Examples of the inorganic fibers include glass fibers, carbon fibers, silicon carbide fibers, ceramic fibers, and metal fibers. The inorganic fibers are not limited to single fibers, and may be composite fibers of synthetic resin fibers such as vinylon, polyamide fibers, aramid fibers, polyester fibers, urethane fibers, olefin fibers, rayon fibers, PBO (poly-p-phenylene benzobisoxazole) fibers, and organic fibers such as cellulose and inorganic fibers. Here, when the sheet layer 24 is composed of fibers, it may be either a woven fabric or a non-woven fabric.

[0025] As the sheet layer 24, for example, a single metal such as steel, stainless steel, or aluminum may be used, or a resin such as polycarbonate, vinyl chloride, urethane resin, or silicone resin, or a composite of a rubber such as NBR (nitrile rubber), CR (chloroprene rubber), EPT (ethylene-propylene rubber), SBR (styrene-butadiene rubber), FR (fluororubber), SR (silicone rubber), or urethane rubber and a metal may be used.

[0026] The sheet layer 24 is not limited to being composed of one material, and may be composed of a combination of two or more materials. In particular, when the sheet layer 24 is an inorganic fiber layer, it has excellent tensile strength, so that the floor slab 14 can be appropriately reinforced, and since it is lightweight, an excessive weight increase of the bridge 10 can be suppressed. Further, when the sheet layer 24 is a metal layer, it has excellent tensile strength, so that the floor slab 14 can be appropriately reinforced.

[0027] Examples of the joining method of the sheet layer 24 to the floor slab 14 include chemical joining by an adhesive or its own adhesiveness, and mechanical joining such as bolts and anchors, and are appropriately selected according to the constituent material and form of the sheet layer 24.

[0028] It is preferable that the sheet layer 24 has good durability such as a long life against repeated loads. Further, since there is a possibility that water or oil oozing from the cracked portion or the like of the floor slab 14 may come into contact with the sheet layer 24, it is preferable that the sheet layer 24 has good water resistance and oil resistance.

[0029] As shown in Fig. 1, the floor slab 14 is formed with holes 26 penetrating in the vertical direction. The holes 26 are filled with the concrete of the concrete layer 22. When the sheet layer 24 is disposed on the lower surface of the floor slab 14 as in the embodiment, the holes 26 are formed so as to continuously penetrate the sheet layer 24 in the vertical direction from the floor slab 14. A plurality of the holes 26 may be formed at intervals from each other as in the embodiment, but are not limited thereto, and may be provided at one location. The holes 26 are preferably larger than the diameter of the concrete placing hose and smaller than the reinforcing bar pitch of the floor slab 14. Further, when the floor slab 14 has the beam 16, the holes 26 are preferably formed at positions deviated from the beam 16.

[0030] The above-described bridge 10 can be manufactured, for example, as follows. When newly constructing the bridge 10, the foamed resin layer 20, the concrete layer 22, and the sheet layer 24 may be formed, or the foamed resin layer 20, the concrete layer 22, and the sheet layer 24 may be formed on the existing bridge to form a new bridge 10.

[0031] There is a space between the floor slab 14 spanned over the lower work 12 and the soil surface (see Fig. 3(a)). First, a foamed resin layer forming step of forming a foamed resin layer 20 in the space below the floor slab 14 is performed (see Fig. 3(b)). For example, if polyurethane foam is used as the foamed resin layer 20, the foamed resin raw material obtained by mixing liquid A (polyol) and liquid B (isocyanate) on-site is sprayed and injected, and the foamed resin raw material is foamed to form polyurethane foam. The foamed resin raw material is directly injected onto the soil surface located below the floor slab 14, and this injection operation is repeated in order from the bottom to form the foamed resin below the floor slab 14. When the foamed resin reaches a height where it can reach the lower surface of the floor slab 14, the formation operation of the foamed resin layer 20 is temporarily stopped. In the foamed resin layer forming step, by directly injecting the foamed resin raw material onto the soil surface, the foamed resin is formed according to the unevenness of the soil surface. Therefore, it is not necessary to level the soil surface or form a base with concrete or the like on the soil surface, and the man-hours can be significantly reduced. In addition, since the foamed resin layer 20 is self-supporting, the work of fixing the blocks required in the case of blocks is not necessary, the work of providing a gradient required in the case of soil is not necessary, and the formwork work required in the case of concrete can be omitted or simplified.

[0032] When providing the sheet layer 24, after forming the foamed resin layer 20 halfway, before the concrete layer forming step described later, a sheet joining step of joining a sheet S containing inorganic fiber or metal to the lower surface of the floor slab 14 is performed (see Fig. 4(a)). At this time, since the work of joining the sheet S to the lower surface of the floor slab 14 can be performed on the foamed resin layer 20 formed halfway, the workability is good and scaffolds and aerial work platforms can be omitted.

[0033] After performing the sheet joining process as necessary, if the concrete layer 22 is reinforced, a steel bar installation process is performed in which the steel bars 22a are assembled and installed between the floor slab 14 and the foamed resin layer 20 (see Fig. 4(b)). The steel bars 22a may be arranged on the foamed resin layer 20 formed partway, or assembled products assembled elsewhere may be installed between the floor slab 14 and the foamed resin layer 20. Note that the steel bars 22a are not limited to assembling bar-shaped steel in a lattice shape on site, and assembled products such as welded wire meshes and steel bar lattices may also be used. The assembled steel bars 22a are hung from the lower surface of the floor slab 14, and the assembled steel bars 22a are installed at a position separated from the lower surface of the floor slab 14 by a necessary cover thickness or more and at a position separated from the upper surface of the foamed resin layer 20 by a necessary cover thickness or more.

[0034] A foamed resin layer forming process for forming the remaining foamed resin layer 20 is performed (see Fig. 5(a)). The foamed resin layer forming process is terminated leaving a space for the concrete layer 22 between the lower surface of the floor slab 14 and the upper surface of the foamed resin layer 20. Since the foamed resin layer forming process, the sheet joining process, and the steel bar installation process can be performed on the lower side of the floor slab 14, traffic on the floor slab 14 is not obstructed.

[0035] Before the concrete layer forming process, holes 26 are drilled in the floor slab 14 (see Fig. 5(b)). Note that when the sheet layer 24 is disposed on the lower surface of the floor slab 14, holes 26 are also drilled in the sheet layer 24. The holes 26 are formed by core drilling or the like from the upper side of the floor slab 14, penetrate the floor slab 14 and the sheet layer 24 in the vertical direction, and lead to the space between the lower surface of the floor slab 14 and the upper surface of the foamed resin layer 20 from the upper side of the floor slab 14. The hole forming process for the holes 26 is not limited to being performed after the completion of the foamed resin layer forming process as long as it is before the concrete layer forming process. As described above, when the foamed resin layer forming process, the sheet joining process, and the steel bar installation process are being performed, traffic is possible on the floor slab 14, so by performing the hole forming process for the holes 26 immediately before the concrete layer forming process, the adverse impact on traffic can be minimized.

[0036] Next, a concrete layer forming step is performed in which concrete (fresh concrete) is filled from the holes 26 to form a concrete layer 22 between the floor slab 14 and the foamed resin layer 20 (see Fig. 6(a)). By filling the concrete between the floor slab 14 and the foamed resin layer 20 so that the concrete overflows up to the holes 26, the holes 26 will be filled with the concrete of the concrete layer 22. Then, by curing the concrete over a predetermined curing period, a concrete layer 22 is formed between the floor slab 14 and the foamed resin layer 20, and the holes 26 are blocked with the concrete of the concrete layer 22. Then, the paving 18 cut out to form the holes 26 is repaired (see Fig. 6(b)).

[0037] In this way, by injecting the concrete from the holes 26 formed in the floor slab 14, it is easy to inject the concrete between the floor slab 14 and the foamed resin layer 20, and the workability and work safety can be improved. Further, by adjusting the position and number of the holes 26, etc., the concrete can be spread widely between the floor slab 14 and the foamed resin layer 20, and the concrete can be filled between the floor slab 14 and the foamed resin layer 20 without gaps. Furthermore, since the degree of filling of the concrete can be confirmed from above the floor slab 14 through the holes 26, the concrete layer 22 can be appropriately formed. Moreover, by filling the holes 26 with the concrete of the concrete layer 22, the labor for blocking the holes 26 can be reduced.

[0038] The manufacturing method of the bridge 10 in the embodiment includes a foamed resin layer forming step of directly injecting a foamed resin raw material onto the soil surface located below the floor slab 14 to form a foamed resin layer 20, a sheet bonding step of bonding the sheet S to the lower surface of the floor slab 14, a reinforcing bar installation step of assembling the reinforcing bars 22a and installing them between the floor slab 14 and the foamed resin layer 20, and a concrete layer forming step of filling the holes 26 made in the floor slab 14 with concrete to form a concrete layer 22 between the floor slab 14 and the foamed resin layer 20. By doing so, a bridge 10 is obtained which includes a foamed resin layer 20 arranged below the floor slab 14, a concrete layer 22 arranged between the floor slab 14 and the foamed resin layer 20, and a sheet layer 24 arranged on the lower surface of the floor slab 14, and the holes 26 penetrating vertically in the floor slab 14 and the sheet layer 24 are filled with the concrete of the concrete layer 22. Similarly, a bridge 10 is obtained which includes a foamed resin layer 20 arranged below the floor slab 14 and a concrete layer 22 which is reinforced concrete arranged between the floor slab 14 and the foamed resin layer 20, and the holes 26 penetrating vertically in the floor slab 14 are filled with the concrete of the concrete layer 22.

[0039] Since the bridge 10 includes a concrete layer 22 arranged between the floor slab 14 and the foamed resin layer 20, when a load is locally applied to the floor slab 14 by a vehicle or the like passing above the floor slab 14, the concrete layer 22 arranged below the floor slab 14 receives and disperses the load, and the dispersed load can be received by the foamed resin layer 20. In this way, the concrete layer 22 which is easier to harden (has a higher compressive strength or tensile strength) compared to the foamed resin layer 20 is interposed between the floor slab 14 and the foamed resin layer 20, so that the dispersion angle of the load applied to the floor slab 14 can be widened. Thereby, it is possible to suppress the local application to the foamed resin layer 20 and widely support it with the foamed resin layer 20. Therefore, in the bridge 10, the durability of the floor slab 14 against the load can be improved.

[0040] In the above-described bridge 10, since the concrete layer 22 is a reinforced concrete layer, even if a load is locally applied to the floor slab 14 by a vehicle or the like passing over the floor slab 14, the floor slab 14 is supported by the reinforced concrete having excellent tensile strength compared to non-reinforced concrete. And since the load can be dispersed and transmitted from the concrete layer 22 to the foamed resin layer 20, the local load on the foamed resin layer 20 can be further reduced. In addition, the concrete layer 22 made of reinforced concrete can be made flexible, whereby the dispersion angle of the applied load can be made wider. Therefore, in the bridge 10, the durability of the floor slab 14 against the load can be improved.

[0041] The above-described bridge 10 includes a sheet layer 24 containing inorganic fibers or metal disposed on the lower surface of the floor slab 14. Even if a load is locally applied to the floor slab 14 by a vehicle or the like passing over the floor slab 14, the floor slab 14 is supported by the tension of the sheet layer 24 disposed on the lower side of the floor slab 14. And since the load can be dispersed and transmitted from the sheet layer 24 to the concrete layer 22, the local load on the foamed resin layer 20 can be further reduced. Therefore, in the bridge 10, the durability of the floor slab 14 against the load can be improved. In particular, by arranging the concrete layer 22 and the sheet layer 24 so as to overlap each other, the sheet layer 24 can be made difficult to be torn by the concrete layer 22.

[0042] The above-described bridge 10, compared with the case of renewing the floor slab 14, has no traffic stoppage for vehicles or a short traffic stoppage period, a short construction period for reinforcing the floor slab 14, and can greatly reduce the cost for renovating an existing bridge. Further, since a large construction machine is not required for forming the foamed resin layer 20, the bridge 10 can be constructed even in a place where it is difficult for large vehicles to enter. In particular, when the foamed resin layer 20 is a site-foamed polyurethane foam, due to the adhesiveness peculiar to the polyurethane foam, the substructure 12 and the concrete layer 22 will adhere. Thereby, the load applied to the foamed resin layer 20 from the floor slab 14 via the sheet layer 24 and the concrete layer 22 can be dispersed to the substructures 12, 12 standing on the left and right, and by integrally supporting the load of the floor slab 14 with the foamed resin layer 20 and the substructure 12, the deformation of the foamed resin layer 20 can be suppressed and the floor slab 14 can be appropriately supported. And according to the above-described manufacturing method, the bridge 10 having the above-described functions and effects can be easily obtained.

[0043] (Modified Example) Not limited to the above-described matters, for example, it may be as follows. Note that the present invention is not limited only to the specific descriptions of the embodiments and the following modified examples. (1) The bridge of the embodiment includes a sheet layer, but is not limited thereto, and the sheet layer may be omitted. (2) The concrete layer is not limited to being reinforced, and may be unreinforced. (3) The bridge of the embodiment exemplifies an automobile bridge that constitutes a road on which vehicles such as automobiles pass, but is not limited thereto, and can also be applied to other uses such as constituting a railway line on which railway vehicles such as trains pass.

Explanation of Reference Numerals

[0044] 10 Bridge, 14 Floor slab, 20 Foamed resin layer, 22 Concrete layer (reinforced concrete layer), 22a Reinforcing bars, 24 Sheet layer, 26 Hole

Claims

1. A foamed resin layer forming process in which a foamed resin raw material is directly injected into the soil surface located under the bridge deck to form a foamed resin layer; A concrete layer forming process of filling concrete through holes in the deck to form a concrete layer between the deck and the foamed resin layer; A method for manufacturing a bridge comprising the steps of:

2. The method for manufacturing a bridge according to claim 1 , further comprising a sheet joining step of joining a sheet containing inorganic fibers or metal to the underside of the deck before the concrete layer forming step.

3. 2. The method for manufacturing a bridge according to claim 1, further comprising a reinforcing bar installation step of assembling and installing reinforcing bars between the deck and the foamed resin layer before the concrete layer forming step.

4. The bridge deck and A foamed resin layer disposed under the deck; A concrete layer disposed between the deck and the foamed resin layer; A sheet layer containing inorganic fibers or metal arranged on the underside of the deck, The deck and the sheet layer are formed with holes penetrating in the vertical direction, The hole is filled with concrete from the concrete layer.

5. The bridge deck and A foamed resin layer disposed under the deck; A reinforced concrete layer is disposed between the deck and the foamed resin layer, A hole penetrating in the vertical direction is formed in the floor slab, The hole is filled with concrete from the reinforced concrete layer.

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