Deck structure, reinforced concrete structure and construction method of deck structure

Abstract

To provide a floor slab structure, a reinforced concrete structure, and a method of constructing a floor slab structure capable of holding a reinforcement member at a proper position when filling a filler in reinforcing a floor slab.SOLUTION: A floor slab structure consists of an internal structure composed of steel or reinforced concrete, a lattice-like reinforcement member, spacers placed between the reinforcement member and the surface of the internal structure, and a filler material filled along a surface of the internal structure, the reinforcement member is disposed so as to be separated from the surface of the internal structure, and the filler material contains the reinforcement member and the spacer.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a deck structure reinforced with reinforcing members, a reinforced concrete structure using the deck structure, and a method for constructing the deck structure. [Background technology]

[0002] Conventionally, when constructing, repairing, or reinforcing a reinforced concrete structure, a technique has been used in which flat reinforcing bar members having a lattice shape processed in a factory are transported to the site and installed in a designated position on the structure at the site.

[0003] In the construction of such conventional reinforcing bar members, lattice-shaped reinforcing bar members are arranged at a predetermined distance along the surface of a structure such as a beam, floor, or column of a structure, and a filling material such as mortar is filled from above. The filling material fills the space between the reinforcing bar member and the structure, and further covers the reinforcing bar member so that the thickness of the filling material from the reinforcing bar member is a predetermined dimension. This structure eliminates the need for a process in which reinforcing bars such as steel bars are assembled by a skilled worker on-site, and a process in which reinforcing bars are assembled and welded in a factory even in the case of a mesh reinforcing bar in which the main reinforcing bars and the distribution bars are welded in advance, reducing the effort and cost of assembling reinforcing bars and eliminating the need to secure skilled workers. In addition, the lattice-shaped reinforcing bar members improve the load-bearing performance of reinforced concrete structures.

[0004] For example, the reinforced concrete structure disclosed in Patent Document 1 is reinforced by a reinforcing bar member formed into a plate shape having a lattice with a plurality of main bars arranged parallel to one another and a plurality of distribution bars connecting adjacent main bars. The reinforced concrete structure of Patent Document 1 uses a plate-shaped reinforcing bar member having a lattice, so that the dimension in the thickness direction is reduced and the load-bearing performance is improved compared to a conventional reinforcing bar structure made of deformed steel bars.

[0005] In addition, the deck structure disclosed in Patent Document 2 has FRP lattice material placed on the deck and filled with steel fiber reinforced ultra-fast hardening concrete to integrate it with the deck. By placing FRP lattice material on the surface of the deck and integrating it with the deck using concrete containing reinforcing fibers, cracks in the concrete subjected to repeated loads are dispersed, resulting in a deck with a crack self-repair function. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2018-91126 A [Patent Document 2] JP 2007-162417 A Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, road and railway viaducts, etc., that have been built long ago during the period of high economic growth and have become old and deteriorated, are being reinforced. When reinforcing the deck of such viaducts, reinforcing members are placed on the deck and filled with concrete or other filling members, as in Patent Document 1. In order to ensure sufficient strength, a filling member of an appropriate thickness is placed between the reinforcing members and the internal structure, such as a deck plate, which is placed as a member of the deck of the viaduct, and the reinforcing members need to be covered with a filling member of an appropriate thickness. However, there was a problem that the reinforcing members moved from their designated positions when filling with the filling member. There was also a problem that the gap between the reinforcing members and the internal structure was not filled with sufficient filling material, resulting in a gap, and the repeated load from the vehicle caused cracks to progress from the gap, causing damage.

[0008] In particular, when placing an FRP lattice material as in Patent Document 2 on a deck slab and filling it with concrete, the FRP lattice material, which has a light specific gravity, is caused to float up by the filling material, and the FRP lattice material cannot be placed in the appropriate position, which is an issue.

[0009] The present invention has been made to solve the above-mentioned problems, and aims to provide a deck slab structure, a reinforced concrete structure, and a construction method for a deck slab structure that can hold reinforcing steel members in the correct position when filling with filler to reinforce the deck, and that suppresses the occurrence of voids in the filler between the internal structure and the filler. [Means for solving the problem]

[0010] The deck structure of the present invention includes an internal structure made of steel or reinforced concrete, a lattice-shaped reinforcing bar member, a spacer disposed between the reinforcing bar member and the surface of the internal structure, and a filler material filled along the surface of the internal structure. A fixing bracket that holds the reinforcing bar member between the internal structure and the fixing bracket; The reinforcing bar member is disposed apart from the surface of the internal structure, and the filling material contains the reinforcing bar member and the spacer. The fixing bracket holds the reinforcing bar member so that it does not move in a direction away from the internal structure, and the fixing bracket has a top plate portion, leg portions extending downward from both ends of the top plate portion, and fixing portions extending parallel to the top plate portion from the lower ends of the leg portions toward the outside, and the fixing portions are fixed to the internal structure. .

[0011] The reinforced concrete structure according to the present invention comprises the above-mentioned deck structure.

[0012] The construction method for a deck structure of the present invention is a construction method for the above-mentioned deck structure, and comprises a spacer placement process of installing the spacer on the surface of the internal structure, a reinforcing bar placement process of placing the reinforcing bar member on the surface of the spacer, and a filling process of filling the filler material so as to encapsulate the spacer and the reinforcing bar member on the surface of the internal structure. Effect of the Invention

[0013] According to the present invention, the reinforcing bar member can be positioned at an appropriate distance from the surface of the internal structure by disposing the spacer, which prevents the occurrence of voids in the filler between the reinforcing bar member and the internal structure, and allows the deck structure and the reinforced concrete structure to be appropriately reinforced by the reinforcing bar member. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view of an viaduct, which is an example of a reinforced concrete structure 100 according to a first embodiment. [Diagram 2]2 is an enlarged perspective view of the superstructure of the reinforced concrete structure 100 of FIG. 1. [Diagram 3] 3 is an enlarged view of the deck plate 23 and the vertical rib 24 in FIG. 2. [Figure 4] FIG. 4 is an enlarged view of the area surrounding the pavement 30 in FIG. 3. [Diagram 5] 1 shows an example of an arrangement of reinforcing bar members 50 and spacers 60 in the deck structure 10 according to the first embodiment. [Figure 6] 13 shows a modified example of the arrangement of the reinforcing bar members 50 and the spacers 60 in the deck structure 10 according to the first embodiment. [Figure 7] FIG. 2 is a schematic diagram of a state in which aggregate is filled between a reinforcing bar member 50 and a deck plate 23 in the deck structure 10 according to the first embodiment. [Figure 8] 11 is an enlarged view of the periphery of a spacer arrangement portion 60a of a reinforcing bar member 50 according to embodiment 2. FIG. [Figure 9] 9 is an explanatory diagram of a cross-sectional structure of a spacer arrangement portion 60a of the reinforcing bar member 50 in FIG. 8. FIG. [Figure 10] 10 is a three-view diagram of the fixing metal fitting 61 shown in FIG. 8 and FIG. 9. [Figure 11] 13 is a modified example of the fixing metal fitting 61 according to the second embodiment. [Figure 12] FIG. 11 is an explanatory diagram of a cross-sectional structure of a spacer arrangement portion 360a of a reinforcing member 50 arranged in a deck structure 310 of a reinforced concrete structure 100 according to embodiment 3. [Figure 13] 13 is an explanatory diagram of a support fitting 361 according to the third embodiment. FIG. [Figure 14] FIG. 11 is an explanatory diagram of a cross-sectional structure of a reinforced concrete structure 400 according to a fourth embodiment. [Figure 15] 13 is an example of an arrangement of reinforcing bar members 50 and spacer arrangement sections 460a in a deck structure 410 according to the fourth embodiment. [Figure 16] 13 is an explanatory diagram of a cross-sectional structure of a spacer arrangement portion 460a of the deck structure 410 according to embodiment 4. FIG. [Figure 17] 13 is an explanatory diagram of a modified example of the cross-sectional structure of a spacer arrangement portion 460a of the deck structure 410 according to embodiment 4. FIG. [Figure 18] 13 is a perspective view of a spacer 60A which is a modified example of the spacer 60. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described based on the drawings. In each drawing, the parts with the same reference numerals represent the same or equivalent parts, and this is common throughout the entire specification. In addition, the forms of the components shown in the entire specification are merely examples, and the present invention is not limited to the description in the specification. In particular, the combination of components is not limited to the combination in each embodiment, and the components described in other embodiments can be applied to other embodiments. Furthermore, when there is no need to particularly distinguish or specify multiple similar parts that are distinguished by subscripts, the subscripts may be omitted. In addition, the size relationship of each component in the drawings may differ from the actual one.

[0016] Embodiment 1 FIG. 1 is a perspective view of an viaduct, which is an example of a reinforced concrete structure 100 according to the first embodiment. In the first embodiment, the reinforced concrete structure 100 is, for example, an expressway viaduct, in which a plurality of bridge piers are arranged in the direction in which a road 93 extends (hereinafter referred to as the first direction), and a steel deck is arranged on a bridge supported by the bridge piers. In the following description, the steel deck is also referred to as an internal structure 90. The deck structure 10 is a structure including the internal structure 90 and a pavement 30 formed on its upper surface. The road 93 is formed on the upper surface of the deck structure 10. As shown in FIG. 1, a vehicle 99 runs on the road 93, so that a repeated load is applied to the deck structure 10. Note that a railroad track may be laid instead of the road 93.

[0017] 2 is an enlarged perspective view of the superstructure of the reinforced concrete structure 100 in FIG. 1. When the direction in which the road 93 extends is defined as the first direction, the main girder 20 includes a plate-shaped main girder web 21 extending in the first direction, a transverse rib 22 arranged to intersect the main girder web 21, and a deck plate 23 made of a steel plate joined to the upper ends of the main girder web 21 and the transverse rib 22. The main girder web 21 and the transverse rib 22 are plate-shaped and arranged so that the width direction of the plate is perpendicular (intersects) to the road 93. The deck plate 23 is joined by welding or the like to the main girder web 21 and the transverse rib 22 arranged to intersect in a crisscross manner, and is configured to withstand a load in the surface direction of the road 93.

[0018] A vertical rib 24 is joined to the underside of the deck plate 23. The vertical rib 24 is a member extending in a first direction in which the road 93 extends, and is formed in a U-shape or a substantially U-shape in a cross section perpendicular to the first direction. The tip of the open side of the U-shape of the vertical rib 24 is joined to the underside of the deck plate 23 by welding or the like. A plurality of the vertical ribs 24 are arranged in a second direction perpendicular to the first direction, and ensure the rigidity and strength of the deck plate 23 against loads in the surface direction of the road 93.

[0019] Fig. 3 is an enlarged view of the deck plate 23 and the vertical rib 24 in Fig. 2. In the cross section shown in Fig. 3, the vertical rib 24 includes two side plate portions 25 extending in a direction in which the plate surface intersects with the road 93, and a bottom plate portion 26 connecting the lower ends of the two side plate portions 25. The upper ends of the side plate portions 25 are welded to the underside of the deck plate 23. A welded portion 28 is formed between the underside of the deck plate 23 and the tip of the side plate portion 25 of the vertical rib 24. With this structure, the vertical rib 24 improves the rigidity of the deck plate 23 in the surface direction.

[0020] As shown in FIG. 3, a pavement 30 is formed on the upper surface of the deck plate 23. The surface of the pavement 30 is a road 93. The tire 80 is a schematic representation of a tire of a vehicle 99 traveling on the road 93, and applies a load F toward the road 93. The longitudinal rib 24 is joined to the lower surface of the deck plate 23 in a portion where the main girder web 21 and the transverse rib 22 are not arranged, thereby suppressing deflection of the deck plate 23 due to the load F applied from the tire 80 through the pavement 30. In the first embodiment, for example, the plate thickness of the deck plate 23 and the plate thickness of the steel plate constituting the longitudinal rib 24 are 9 to 16 mm. In addition, the height of the U-shape of the longitudinal rib 24 is 200 to 400 mm.

[0021] Fig. 4 is an enlarged view of the periphery of the pavement 30 in Fig. 3. A block-shaped spacer 60 is placed on the deck plate 23, and a reinforcing bar member 50 is placed on top of that. The filler 70 is filled to a predetermined thickness on the deck plate 23. In the first embodiment, concrete or mortar is used for the filler 70, and fiber-reinforced concrete or fiber-reinforced mortar is used in which synthetic fibers or FRP fibers such as steel fibers, carbon fibers, aramid fibers, and vinylon fibers are mixed in to prevent cracks. Mortar mixed with resin may also be used for the filler 70.

[0022] The spacer 60 is placed on the upper surface of the deck plate 23 to properly ensure a distance between the upper surface of the deck plate 23 and the reinforcing bar member 50. The height of the spacer 60 is set to, for example, 10 to 40 mm. The height of the spacer 60 is adjusted according to the gap height H between the reinforcing bar member 50 and the upper surface of the deck plate.

[0023] FIG. 5 is an example of the arrangement of the reinforcing bar members 50 and the spacers 60 in the deck structure 10 according to the first embodiment. FIG. 5 is a top view of the deck structure 10 in FIG. 3, with the filler 70 seen through. The arrow X in FIG. 5 indicates the first direction in which the road 93 extends. The reinforcing bar member 50 is configured in a lattice shape with a plurality of main reinforcements 51 extending in a direction perpendicular to the first direction and a plurality of distribution reinforcements 52 extending in the first direction intersecting each other as shown in FIG. 5. The main reinforcements 51 and the distribution reinforcements 52 are arranged on the same plane. In other words, the reinforcing bar member 50 has a structure in which the side surfaces of two adjacent main reinforcements 51 are connected by the distribution reinforcements 52.

[0024] The main reinforcement bars 51 are arranged so as to extend in a direction perpendicular to the first direction. The distribution bars 52 are arranged along the first direction. The reinforcing bar member 50 shown in Fig. 5 is made by cutting a steel plate and processing it into a lattice shape, and the main reinforcement bars 51 and the distribution bars 52 are arranged perpendicular to each other. In the reinforcing bar member 50 shown in Fig. 5, the main reinforcement bars 51 and the distribution bars 52 are set to the same thickness.

[0025] By arranging the main reinforcements 51 to extend in a direction perpendicular to the first direction in which the longitudinal ribs 24 extend, the main reinforcements 51 exert tensile resistance, alleviating stress generated in the deck plate 23 and preventing fatigue damage to the deck slab structure 10. The reinforcing bars 52 are arranged in a direction along the longitudinal ribs 24 and distribute the load to the multiple main reinforcements 51. This alleviates local stress generation in the main reinforcements 51 and improves the fatigue durability of the reinforcing bar member 50. In particular, the load distribution effect is high when the reinforcing bar member 50 has a square or rectangular lattice pattern as shown in FIG. 5. In the first embodiment, the plate thickness of the reinforcing bar member 50 is set to 4.5 to 12 mm, and the lattice spacing is set to 50 to 200 mm.

[0026] Fig. 6 shows a modified example of the arrangement of reinforcing bar members 50 and spacers 60 in the deck structure 10 according to the first embodiment. The reinforcing bar member 50 shown in Fig. 6 is formed, for example, by making multiple cuts in a single steel plate and expanding the steel plate so that the cuts are expanded in one direction. The cuts in the steel plate are provided, for example, to extend in a direction perpendicular to the arrow X in Fig. 6, and the steel plate is expanded in the X direction so that the main reinforcement 51 extends in a straight line in the direction perpendicular to the arrow X. The multiple distribution reinforcement bars 52 are inclined with respect to the arrow X, and are connected by being bent in a zigzag pattern along the first direction indicated by the arrow X.

[0027] Even in the case of an expansion-type reinforcing bar member 50 as shown in Fig. 6, multiple main reinforcements 51 extend in a direction perpendicular to the first direction in which the vertical ribs 24 extend, so that the main reinforcements 51 exert tensile resistance and relieve stress on the deck plate 23, preventing fatigue damage. The distribution bars 52 shown in Fig. 6 are inclined with respect to the first direction, but are arranged in a direction along the vertical ribs 24, so that the effect of distributing the load to the multiple main reinforcements 51 can be obtained, similar to the reinforcing bar member 50 shown in Fig. 5.

[0028] As shown in FIG. 4, the filler 70 is filled so as to cover the entire reinforcing bar member 50 and the spacer 60. In the first embodiment, the covering thickness K of the filler 70 above the reinforcing bar member 50 is set to a thickness of 20 to 40 mm. The filler 70 is also filled between the reinforcing bar member 50 and the deck plate 23 without leaving any gaps. The filler 70 is, for example, concrete. Concrete is made by mixing cement, fine aggregate, and coarse aggregate. The fine aggregate is, for example, sand, which passes through a 10 mm mesh sieve and has a grain size of 5 mm or less in 85% or more by mass. The coarse aggregate is, for example, gravel, which is a large-grained aggregate with 85% or more by mass remaining on a 5 mm sieve. The maximum dimension D of the coarse aggregate is determined by the dimension of the sieve with the smallest mesh size among the sieves through which at least 90% by mass passes. The mesh sizes of the sieves used are generally 13 mm, 20 mm, 25 mm, and 40 mm. Fine aggregate and coarse aggregate are collectively called aggregate 71.

[0029] FIG. 7 is a schematic diagram of a state in which aggregate 71 is filled between the reinforcing bar member 50 and the deck plate 23 in the deck slab structure 10 according to the first embodiment. When the reinforcing bar member 50 is placed at a gap height H from the deck plate 23, it is necessary that the aggregate 71 having the maximum dimension D contained in the concrete is filled without any gaps between the reinforcing bar member 50 and the deck plate 23. If the gap height H is not set appropriately, the filler is not sufficiently filled in the gap between the reinforcing bar member and the internal structure, and a gap is formed, and there is a risk that cracks will progress from the gap due to repeated loads from the vehicle, causing damage. Therefore, as shown in FIG. 7, the gap height H needs to be set so that two aggregates 71 having the maximum dimension D come into contact with each other when they are placed under the reinforcing bar member 50. By setting the gap height H in this way, the concrete containing the aggregate 71 having the maximum dimension D is filled without any gaps between the reinforcing bar member 50 and the deck plate 23.

[0030] If the gap height between the reinforcing bar member 50 and the deck plate 23 is H, the width of the main bars 51 or distribution bars 52 of the reinforcing bar member 50 is B, and the diameter of the aggregate is D, then the aggregate 71 will be filled in the gap between the reinforcing bar member 50 and the deck plate 23 when the following relationship is satisfied. When D≧B, H>D / 2+(B / 2×(DB / 2)) 0.5 (1) When D≦B, H>D (2)

[0031] For example, if the filler 70 is fiber-reinforced concrete, the maximum dimension of the coarse aggregate D is 20 mm, and the width dimension B of the reinforcing bar member 50 is 7 mm, then H>14.8 mm based on the above formula (1). Therefore, it is advisable to set the gap height H to, for example, 15 mm or more.

[0032] In addition, when the filler 70 is mortar, no coarse aggregate is mixed in, and only fine aggregate having an aggregate diameter D of 5 mm or less is mixed in. Therefore, based on the above formula (2), it is sufficient to ensure that the gap height H>5 mm, and preferably the gap height H>10 mm.

[0033] As described above, the gap height H between the reinforcing bar member 50 and the deck plate 23 is appropriately set according to the maximum dimension D of the aggregate 71 contained in the filler 70. As a result, even if the aggregate 71 with the maximum dimension D is placed under the reinforcing bar member 50, no gap is generated in the filler 70 filled under the reinforcing bar member 50, because the aggregates are configured to be in contact with each other at the contact parts 72 in FIG.

[0034] In the first embodiment, the spacer 60 is made of a magnet. For example, a ferrite magnet is used as the magnet, but other magnets such as neodymium magnets may also be used. The spacer 60 is fixed to the steel deck plate 23 by the magnetic force of the spacer 60, and the reinforcing bar member 50 is also fixed to the spacer 60. Therefore, the reinforcing bar member 50 can be easily installed on the deck structure 10 by the spacer 60 having magnetic force. In addition, by adjusting the dimensions of the spacer 60 to the gap height H described above, the distance between the reinforcing bar member 50 and the internal structure 90 can be appropriately secured. In particular, when concrete is used as the filler 70, the filler 70 contains about 60% coarse aggregate as a ratio, so there is a risk that the aggregate 71 does not penetrate under the reinforcing bar member 50 and a gap is generated in the filler 70. However, by securing the gap height H as described above, the generation of a gap under the reinforcing bar member 50 can be suppressed.

[0035] (Construction method of deck structure 10) 4 and 5, a process for reinforcing the deck structure 10 of the reinforced concrete structure 100 with reinforcing bar members 50 will be described. In the first embodiment, a case will be described in which the internal structure 90 is a steel deck using a deck plate 23. First, the deck structure 10 is in a state in which the deck plate 23 is exposed. For example, if an existing structure is to be the deck structure 10, a removal process is carried out in which the pavement 30 on the surface of the existing structure is chipped and removed to expose the deck plate 23. The deck plate 23 is the surface of the internal structure 90. Furthermore, if the deck structure 10 is to be newly constructed, the removal process is not necessary.

[0036] Next, the spacer 60 is placed on the surface of the deck plate 23. This process is called the spacer placement process. Then, the reinforcing bar member 50 is placed on the spacer 60. This process is called the reinforcing bar placement process. If the spacer 60 has magnetic force, the spacer 60 is attracted to and fixed on the deck plate 23. The reinforcing bar member 50 can also be attracted to the spacer 60 to fix its position.

[0037] With the reinforcing bar member 50 placed on the spacer 60, the filler 70 is filled into the surface of the internal structure 90. This process is called the filling process. The filler 70 is filled so as to enclose the spacer 60 and the reinforcing bar member 50.

[0038] In the first embodiment, the case where the internal structure 90 is a steel deck has been described, but the internal structure 90 may be a reinforced concrete deck. In that case, in the above-mentioned removal process, a space is secured on the surface of the internal structure 90 to the extent that the reinforcing bar member 50 and the spacer 60 can be placed thereon.

[0039] Embodiment 2 The following describes a deck structure 210 of a reinforced concrete structure 100 according to embodiment 2. The deck structure 210 according to embodiment 2 is obtained by changing the fixing structure of the reinforcing bar members 50 in the deck structure 10 according to embodiment 1. In embodiment 2, the changes from embodiment 1 will be mainly described.

[0040] Fig. 8 is an enlarged view of the periphery of spacer arrangement portion 60a of reinforcing bar member 50 according to embodiment 2. Fig. 9 is an explanatory view of the cross-sectional structure of spacer arrangement portion 60a of reinforcing bar member 50 in Fig. 8. Although internal structure 90 is omitted in Fig. 9, it may be deck plate 23 as shown in Fig. 1 or the like, or may be, for example, a reinforced concrete floor slab.

[0041] The reinforcing bar members 50 are installed along the surface of the internal structure 90 in the deck structure 10, but as explained above, they may not only be placed on the spacers 60 but also be fixed by the fixing brackets 61. In other words, the reinforcing bar members 50 and the spacers 60 may be fixed by being sandwiched between the fixing brackets 61 and the internal structure 90. The fixing brackets 61 are fixed to the internal structure 90 by fixing members 66 such as bolts, for example, and fix the reinforcing bar members 50 and the spacers 60 by pressing them against the internal structure 90.

[0042] Figure 10 is a three-view diagram of the fixing bracket 61 shown in Figures 8 and 9. Figure 10(a) is a top view of the fixing bracket 61, Figure 10(b) is a front view of the fixing bracket 61, and Figure 10(c) is a side view of the fixing bracket 61. The fixing bracket 61 comprises a top plate portion 62, leg portions 64 extending downward from both ends of the top plate portion 62, and fixing portions 63a and 63b extending outward from the lower ends of the leg portions 64 in parallel to the top plate portion 62.

[0043] The fixing bracket 61 is arranged so as to press the upper surface of the reinforcing bar member 50 downward, and the gap height H is adjusted by providing a spacer 60 between the reinforcing bar member 50 and the internal structure 90, while the reinforcing bar member 50 is pressed down by a fixing member 66, such as an anchor bolt, which is screwed into the internal structure 90. As shown in Fig. 10(b), the fixing bracket 61 is hat-shaped, which is a structure for preventing the head of the fixing member 66 from protruding from the filling material 70 and for stably pressing the reinforcing bar member 50 against the internal structure 90 so as not to shift sideways.

[0044] The fixing parts 63a and 63b each have a hole 65a or 65b for inserting a fixing member 66. The hole 65a of the fixing part 63a is an elongated hole, so that the horizontal position of the fixing bracket 61 can be adjusted according to the position of the fixing member 66.

[0045] FIG. 11 shows a modified example of the fixing bracket 61 according to the second embodiment. FIG. 11(a) is a top view of the modified example of the fixing bracket 61, and FIG. 11(b) is a front view of the modified example of the fixing bracket 61. In the modified example of the fixing bracket 61, holes 65c and 65d for passing the fixing member 66 are provided in one fixing portion 63b. In FIG. 10, the hole 65a in one fixing portion 63a is made into an elongated hole to accommodate misalignment of the fixing member 66, but multiple holes 65c and 65d may be provided in the fixing portion 63b as in the fixing bracket 61 of FIG. 11. In the fixing bracket 61 of FIG. 11, misalignment of the fixing member 66 can be absorbed by inserting the fixing member 66 into the hole 65c or 65d.

[0046] 10 and 11, the fixing metal fitting 61 is not limited to the hat-shaped form, and may be flat. In the case of a plate-shaped fixing metal fitting 61, the head of the fixing member 66 is located above the reinforcing bar member 50, so the covering thickness K of the filler 70 needs to be large. For example, it is preferable that the covering thickness K of the filler 70 is 20 to 40 mm from the head of the fixing member 66.

[0047] Furthermore, since the spacer arrangement portion 60a of the reinforcing bar member 50 according to the second embodiment uses the fixing brackets 61 to fix the reinforcing bar member 50 along the surface of the internal structure 90, the spacer 60 does not need to have magnetic force. For example, the spacer 60 may be a concrete block.

[0048] (Construction method of deck structure 210) A construction method for the deck structure 210 will be described with reference to Fig. 9. In the second embodiment, a case where the deck structure 210 is constructed by reinforcing an existing deck structure of reinforced concrete structure will be described. However, the steps other than the removal step are the same even for a newly constructed deck structure of reinforced concrete structure.

[0049] First, the surface of the existing reinforced concrete is chipped and removed to secure a space on the surface of the internal structure 90 for arranging the reinforcing bar member 50, the fixing bracket 61 and the fixing member 66.

[0050] Next, the spacer 60 is placed on the surface of the internal structure 90. This process is called a spacer placement process. Then, the reinforcing bar member 50 is placed on the spacer 60. This process is called a reinforcing bar placement process. If the spacer 60 has magnetic force, the spacer 60 can fix the position by attracting the reinforcing bar member 50 to the spacer 60.

[0051] With the reinforcing bar member 50 placed on the spacer 60, the fixing bracket 61 is placed so as to cover the reinforcing bar member 50. This is called the fixing bracket installation process. The fixing bracket 61 is fixed to the internal structure 90 by a fixing member 66 such as a bolt, and fixes the reinforcing bar member 50 and the spacer 60 so as to press them against the surface of the internal structure 90.

[0052] With the reinforcing bar members 50 fixed, the filler 70 is filled into the surface of the internal structure 90. This process is called the filling process. The filler 70 is filled so as to enclose the spacers 60 and the reinforcing bar members 50.

[0053] Embodiment 3 The following describes a deck structure 310 of a reinforced concrete structure 100 according to embodiment 3. The deck structure 310 according to embodiment 3 is obtained by modifying the structure corresponding to the spacer 60 of the deck structure 210 according to embodiment 2. In embodiment 3, the following mainly describes the changes from embodiment 2.

[0054] Fig. 12 is an explanatory diagram of a cross-sectional structure of a spacer arrangement portion 360a of a reinforcing bar member 50 arranged on a deck structure 310 of a reinforced concrete structure 100 according to embodiment 3. Fig. 13 is an explanatory diagram of a support metal fitting 361 according to embodiment 3. Fig. 13(a) is a top view of the support metal fitting 361, and Fig. 13(b) is a front view of the support metal fitting 361. In the reinforced concrete structure 100 according to embodiment 3, the reinforcing bar member 50 arranged on the deck structure 310 is supported by a support structure 360 ​​shown in Fig. 12, rather than by a spacer 60 as shown in Figs. 3, 4, and 9, etc.

[0055] The support structure 360 ​​includes a lower nut 367a screwed onto an anchor bolt, which is a fixing member 366 erected on the surface of the internal structure 90, and a support bracket 361 placed on the lower nut 367a. In the third embodiment, the reinforcing bar member 50 is placed on the support bracket 361 to adjust the gap height H, which is the distance between the internal structure 90 and the reinforcing bar member 50.

[0056] A fixing bracket 61 is attached to the upper part of the support structure 360. The fixing bracket 61 fixes the reinforcing bar member 50 by sandwiching it between the fixing bracket 61 and the support bracket 361 by fastening an upper nut 367b. In the third embodiment, two spacers 369 are sandwiched between the fixing bracket 61 and the reinforcing bar member 50. However, the number and size of the spacers 369 can be changed appropriately by changing the height of the hat shape of the fixing bracket 61.

[0057] The fixing metal fitting 61 is formed in a hat shape, but may be formed in a flat plate shape. However, it is necessary to ensure an appropriate covering thickness K for the tip of the fixing member 366.

[0058] The spacer 369 may have a magnetic force. Since the spacer 369 has a magnetic force, the reinforcing bar member 50 can be sandwiched and temporarily fixed between the support metal fitting 361 and the magnetic spacer 369. In this case, the fixing metal fitting 61 and the upper nut 367b can be omitted from the support structure 360.

[0059] The support bracket 361 can adjust the gap height H of the reinforcing member 50 by shifting the position of the lower nut 367a in the axial direction of the fixing member 366 shown in FIG. 12. The reinforced concrete structure 100 may be formed, for example, by scraping off the surface of an existing structure, arranging the reinforcing member 50 in the scraped-off portion, and filling it with the filler 70. When the reinforcing member 50 is arranged to reinforce the existing structure, the surface of the internal structure 90 formed by scraping off the surface of the existing structure may have large irregularities. In this case, even if the spacer 60 as in the first embodiment is arranged, it may be difficult to ensure a predetermined gap height H between the reinforcing member 50 and the internal structure 90. In addition, when the spacer 60 is arranged on the surface of the internal structure 90 with large irregularities, it may be unstable and unable to stably support the reinforcing member 50. However, according to the support structure 360 ​​according to the third embodiment, the position of the support bracket 361 can be adjusted regardless of the state of the surface of the internal structure 90, so that the reinforcing member 50 can be stably arranged even if the surface of the internal structure 90 has irregularities.

[0060] The support structure 360 ​​may have a reinforcing member 368 installed between the support bracket 361 and the surface of the internal structure 90. For example, when installing the reinforcing member 50, a worker may stand on the placed reinforcing member 50, which may cause deformation of the support bracket 361. By providing the reinforcing member 368, the support structure 360 ​​is ensured to have sufficient strength even during installation.

[0061] (Construction method of deck structure 310) A construction method for the deck structure 310 will be described with reference to Fig. 12. In the third embodiment, a case where the deck structure 310 is constructed by reinforcing an existing deck structure of reinforced concrete will be described. However, even when construction is performed on a newly constructed deck structure of reinforced concrete, the same steps are performed except for the removal step.

[0062] First, a removal process is performed in which the surface of the existing reinforced concrete structure is chipped and removed. In the removal process, a space is secured on the surface of the internal structure 90 for arranging the reinforcing bar member 50, the support bracket 361, the fixing bracket 61, and the fixing member 366.

[0063] Next, the fixing member 366 is placed on the surface of the internal structure 90. The fixing member 366 is placed, for example, by drilling a hole in the internal structure 90 and embedding the fixing member 366 in the hole. Furthermore, the lower nut 367a is screwed onto the fixing member 366. After the lower nut 367a is screwed onto the two fixing members 366, the support bracket 361 is placed on the lower nut 367a. These steps correspond to the spacer arrangement step in the first or second embodiment. In the third embodiment, the above steps are performed as the spacer arrangement step.

[0064] After that, the reinforcing bar member 50 is placed on the support metal fitting 361. This process is called the reinforcing bar placing process. In the reinforcing bar placing process, the spacer 369 is appropriately placed on the reinforcing bar member 50. This is performed if necessary depending on the shape of the fixing metal fitting 61.

[0065] With the reinforcing bar member 50 placed on the support bracket 361, the fixing bracket 61 is arranged so as to cover the reinforcing bar member 50 from above. The fixing bracket 61 is fastened and fixed by screwing the upper nut 367b with the fixing member 366, and fixes the reinforcing bar member 50 and the spacer 369 so as to press them against the support bracket 361.

[0066] With the reinforcing bar member 50 fixed, a filling step is performed in which the filler 70 is filled into the surface of the internal structure 90. The filler 70 is filled so as to enclose the fixing member 366, the fixing metal fittings 61, and the reinforcing bar member 50.

[0067] Embodiment 4 A deck structure 410 of a reinforced concrete structure 400 according to embodiment 4 will be described. The deck structure 410 according to embodiment 4 will be described as a reinforcement structure of a deck structure 410 of a box culvert forming a waterway under a road, for example, as the reinforced concrete structure 400. In embodiment 4, the changes from embodiment 1 will be mainly described.

[0068] 14 is an explanatory diagram of a cross-sectional structure of a reinforced concrete structure 400 according to the fourth embodiment. The reinforced concrete structure 400 according to the fourth embodiment is, for example, a box culvert forming a waterway under a road, and the upper surface of the interior is reinforced with a reinforcing member 50. The upper surface and sides of the interior of the reinforced concrete structure 400 are scraped away, reinforcing members 50 are placed there, and mortar is sprayed onto the surface as a filler 70 to reinforce the upper surface and the side. The reinforcing member 50 includes a reinforcing member 50a placed in the center of the upper surface and a reinforcing member 50b placed from the upper surface to the side. The reinforcing members 50a and 50b are placed so as to overlap each other partially.

[0069] FIG. 15 is an example of the arrangement of the reinforcing bar member 50 and the spacer arrangement portion 460a in the deck structure 410 according to the fourth embodiment. FIG. 15(a) is a plan view of the upper surface of the reinforced concrete structure 400 seen from the inside, and FIG. 15(b) is an explanatory diagram of the cross-sectional structure of the upper part of the reinforced concrete structure 400. As shown by the arrow X in FIG. 15(a), the main reinforcement 51 of the reinforcing bar member 50 is arranged so as to extend in a direction perpendicular to the first direction in which the water channel extends. In addition, the reinforcing bar member 50 shown in FIG. 15(a) is an expansion type reinforcing bar member formed by making cuts in a steel plate and expanding it, but the reinforcing bar member 50 with a square lattice pattern shown in FIG. 5 may be used, or the lattice pattern may be of another shape.

[0070] 15(b), even when installing the reinforcing bar member 50 from below the deck structure 410, it is necessary to properly ensure the gap height H between the reinforcing bar member 50 and the internal structure 90. In addition, since it is necessary to properly ensure the covering thickness K of the filling material 70, the reinforcing bar member 50 needs to be held in a proper position when filling the filling material 70.

[0071] 16 is an explanatory diagram of the cross-sectional structure of a spacer arrangement portion 460a of a deck structure 410 according to embodiment 4. The reinforcing bar member 50 of the deck structure 410 according to embodiment 4 is sandwiched and fixed between a fixing bracket 61 and an internal structure 90. The fixing bracket 61 is fixed by screwing a fixing member 66 into the internal structure 90. At this time, a spacer 60 is arranged between the internal structure 90 and the reinforcing bar member 50, and the distance of the gap height H is appropriately secured.

[0072] The spacer 60 may have a magnetic force. For example, if the internal structure 90 has reinforcing bars 98 therein, the spacer 60 having a magnetic force can be arranged so as to be attracted to the reinforcing bars 98 inside the internal structure 90, and the reinforcing bar member 50 can be attracted to the spacer 60 to temporarily fix the reinforcing bar member 50. Also, if a steel plate member such as the deck plate 23 is arranged inside the internal structure 90, the use of the spacer 60 having a magnetic force makes it easy to temporarily fix the reinforcing bar member 50.

[0073] 17 is an explanatory diagram of a modified cross-sectional structure of the spacer arrangement portion 460a of the deck structure 410 according to the fourth embodiment. The reinforced concrete structure 400 according to the fourth embodiment may be an existing box culvert. In this case, the surface of the deck structure 410 is scraped to expose the existing reinforcing bars 98 of the internal structure 90, and the magnetic spacer 60 can be attached to the reinforcing bars 98. After the magnetic spacer 60 is attached to the existing reinforcing bars 98, the reinforcing bar member 50 is attached to the spacer 60, and the reinforcing bar member 50 can be temporarily fixed to the upper surface of the inside of the internal structure 90.

[0074] The dimensions of the spacer 60 are adjusted so as to properly ensure the gap height H with the internal structure 90, and a fixing bracket 61 is attached from the underside of the reinforcing bar member 50. The fixing bracket 61 is fixed with a nut 67 screwed into a fixing member 66 fixed to the internal structure 90. Mortar, which is the filler 70, is then sprayed onto the inner upper surface and sides of the internal structure 90 to cover the reinforcing bar member 50, the fixing bracket 61, and other components with the filler 70. In this way, the reinforcing bar member 50 can be placed on the underside of the deck structure 410 of the reinforced concrete structure 400 to reinforce it.

[0075] Although the present invention has been described above based on the embodiments, the present invention is not limited to the configurations of the above-mentioned embodiments. In particular, the combinations of the components are not limited to the combinations in the embodiments, but can be changed as appropriate.

[0076] Fig. 18 is a perspective view of a spacer 60A, which is a modified example of the spacer 60. The spacers 60 of the first, second and fourth embodiments and the reinforcing member 368 of the third embodiment can be replaced with the spacer 60A. The spacer 60A is composed of a plurality of leg reinforcing bars 60Aa and supporting reinforcements 60Ab joined to the tops of the plurality of leg reinforcing bars 60Aa. The spacer 60A supports the reinforcing bar member 50 or the reinforcing member 368 placed on the supporting reinforcements 60Ab.

[0077] It should be noted that the scope of various modifications, applications, and uses that may be made by those skilled in the art as necessary is also included within the gist (technical scope) of the present invention. [Explanation of symbols]

[0078] 10 Deck slab structure, 20 Main girder, 21 Main girder web, 22 Horizontal rib, 23 Deck plate, 24 Vertical rib, 25 Side plate portion, 26 Bottom plate portion, 28 Welded portion, 30 Pavement, 32 Deck plate, 50 Reinforcement member, 50a Reinforcement member, 50b Reinforcement member, 51 Main bar, 52 Force distribution bar, 60 Spacer, 60A Spacer, 60Aa Leg reinforcement, 60Ab Support reinforcement, 60a Spacer arrangement portion, 61 Fixing bracket, 62 Top plate portion, 63a Fixing portion, 63b Fixing portion, 64 Leg portion, 65a Hole, 65b Hole, 65c Hole, 65d Hole, 66 Fixing member, 67 Nut, 70 Filler, 71 Aggregate, 72 Contact portion, 80 Tire, 90 Internal structure, 93 Road, 98 (existing) reinforcing bar, 99 vehicle, 100 reinforced concrete structure, 210 deck structure, 310 deck structure, 360 support structure, 360a spacer arrangement section, 361 support fitting, 366 fixing member, 367a lower nut, 367b upper nut, 368 reinforcing member, 369 spacer, 400 reinforced concrete structure, 410 deck structure, 460a spacer arrangement section.

Claims

1. An internal structure made of steel or reinforced concrete; A lattice-shaped reinforcing bar member; A spacer disposed between the reinforcing bar member and a surface of the internal structure; A filler material is filled along a surface of the internal structure; and a fixing bracket that holds the reinforcing bar member between the internal structure and the fixing bracket, The reinforcing bar member is a surface of the internal structure, the surface being spaced apart from the surface of the internal structure; The filler is The reinforcing bar member and the spacer are contained therein, The fixing metal fitting holds the reinforcing bar member so as not to move in a direction away from the internal structure, The fixing metal fitting has a top plate portion, leg portions extending downward from both ends of the top plate portion, and fixing portions extending outward from lower ends of the leg portions in parallel with the top plate portion, A deck structure, wherein the fixing portion is fixed to the internal structure.

2. The filler is Contains aggregate, When the maximum dimension of the aggregate is D, the width of the reinforcing member is B, and the distance between the reinforcing member and the surface of the internal structure is H, the distance H is: H>D / 2+(B / 2×(D-B / 2)) ０．５ Fulfilling The height dimension of the spacer is The deck structure according to claim 1 , which is set to be greater than or equal to the distance H.

3. The spacer is 3. A deck structure according to claim 1 or 2, which is block-shaped.

4. The spacer is A fixing member erected on a surface of the internal structure; A support bracket fixed to the fixing member, The support bracket is The deck structure according to claim 1 or 2, which supports the reinforcing steel member.

5. The spacer is The deck structure according to claim 3 or 4, which has magnetic force.

6. The reinforcing bar member is A plurality of main reinforcements extending parallel to each other; The deck structure according to any one of claims 1 to 5, further comprising a reinforcing bar arranged to connect the sides of the plurality of main reinforcements.

7. The reinforcing bar member is 7. The deck structure according to claim 6, wherein the steel plate having the cuts formed therein is expanded in one direction to form a lattice shape.

8. The reinforcing bar member is A deck structure according to any one of claims 1 to 7, having protrusions on its surface.

9. The internal structure is The deck structure according to any one of claims 1 to 8, which is a steel deck.

10. The internal structure is The deck structure according to any one of claims 1 to 8, which is a reinforced concrete deck.

11. The reinforcing bar member is A deck structure as described in any one of claims 1 to 10, which is arranged below the internal structure.

12. A reinforced concrete structure comprising the deck structure according to any one of claims 1 to 11.

13. The deck structure is 13. The reinforced concrete structure according to claim 12, having a road or a railway laid on its upper surface.

14. The reinforcing bar member of the deck structure is The reinforced concrete structure according to claim 13, which recites claim 6, wherein the plurality of main reinforcements are arranged to extend in a direction intersecting a first direction in which a road or a railway is laid.

15. A construction method for a deck structure according to any one of claims 1 to 11, a spacer placement step of placing the spacer on a surface of the internal structure; A reinforcing bar placing process of placing the reinforcing bar member on a surface of the spacer; A construction method for a deck structure comprising: a filling process for filling the filler onto the surface of the internal structure so as to encapsulate the spacer and the reinforcing bar member.

16. The internal structure is The steel deck, The spacer arrangement step includes: A construction method for a deck structure according to claim 15 which recites claim 9, wherein the spacer having magnetic force is attached to the steel deck and installed.

17. The spacer arrangement step includes: A fixing member is installed on a surface of the internal structure, and a support bracket is fixed to the fixing member; The reinforcing bar placing step includes: A construction method for a deck structure according to claim 15 which relies on claim 4, further comprising placing the reinforcing bar member on the support bracket.

18. Further comprising a removing step of removing a surface of an existing structure prior to the spacer arrangement step; The method for constructing a deck structure according to any one of claims 15 to 17, wherein the existing structure from which the surface has been removed is used as the internal structure.

19. The method for constructing a deck structure according to any one of claims 15 to 18, further comprising a fixing bracket installation step of installing the fixing bracket so as to sandwich the reinforcing bar member between the internal structure after the reinforcing bar placing step.

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