Reinforcement methods for reinforced concrete structures

Abstract

To provide a reinforced concrete structure and a method for reinforcing reinforced concrete structures that suppress damages when a load is applied to an upper structure.SOLUTION: A reinforced concrete structure according to the present invention includes a support structure that supports an upper structure from below, and slabs formed to overhang laterally from the support structure. The slab includes a reinforcing bar member having multiple main reinforcing bars arranged parallel to each other and multiple fixed transverse bars that connect the side surfaces of the multiple adjacent main reinforcing bars, and a filling member filled around the reinforcing bar member. The main reinforcing bars extend in a direction intersecting the edge of the slab, and the fixed transverse bars are arranged along the edge of the slab.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a reinforced concrete structure, and in particular to a structure erected at the end of a deck slab. Ru iron This relates to a method for reinforcing reinforced concrete structures. [Background technology]

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

[0003] In conventional reinforcement construction, lattice-shaped reinforcement members are placed at a predetermined distance along the surface of a structure's beams, floors, or columns, and then filled with a filler such as mortar. The filler fills the space between the reinforcement members and the structure, and further covers the reinforcement members so that the thickness of the filler from the reinforcement members is a predetermined dimension. This structure eliminates the need for skilled workers to assemble reinforcing bars such as steel bars on-site or to weld the reinforcing bars in a factory, reducing the labor and cost required for assembling the reinforcing bars and eliminating the need to secure skilled workers. Furthermore, lattice-shaped reinforcement members improve the load-bearing capacity 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 with a lattice, which is made up of 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 with a lattice, which reduces the dimension in the thickness direction and improves the load-bearing capacity compared to conventional reinforcing bar structures made up of deformed steel bars. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-91126 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, the number of platform doors installed on station platforms has been increasing. Platform doors are erected at the end of station platforms along the tracks and separate the area next to the tracks from the space above the platform. A space that serves as a work passage and evacuation space is provided below the platform, and the cross-sectional structure of the platform deck is a cantilever structure with the track side being the free end. Platform doors are installed on the top surface of the free end of the platform deck and are displaced so that they tilt toward the tracks due to negative pressure generated by trains passing over the tracks.

[0007] The reinforced concrete structure disclosed in Patent Document 1 has reinforcing bars arranged to reinforce the deck, but the reinforcing bars are arranged to reinforce the deck, with both ends supported by columns from below. Therefore, in decks where a superstructure such as platform doors is installed at the end, even if reinforcing bars are arranged in the same way as for decks where the ends are supported by columns from below, there is a problem in that the load applied to the superstructure erected on the top surface of the free end can cause damage such as cracks in the deck at the end where the superstructure is installed.

[0008] The present invention has been made to solve the above problems, and provides a method for suppressing damage when a load is applied to a superstructure in a reinforced concrete structure having a floor slab on which a structure is erected on the upper surface of an end portion. Ru iron The object is to provide a method for reinforcing a reinforced concrete structure. [Means for solving the problem]

[0010] The method for reinforcing a reinforced concrete structure according to the present invention is a method for reinforcing a reinforced concrete structure comprising a support structure supporting an upper structure from below, and a deck slab formed to protrude laterally from the support structure, and comprises: a reinforcing bar arrangement step in which a reinforcing bar member having a plurality of main bars arranged parallel to one another and a plurality of anchored cross bars connecting the sides of adjacent main bars is arranged from above the support structure of the deck slab to an end of the deck slab, and the plurality of anchored cross bars are arranged along the edge of the deck slab away from the support structure; a filling step in which a filling member is filled around the reinforcing bar member; and a fixing part installation step in which the fixing part is installed so that the plurality of anchored cross bars of the reinforcing bar member are arranged between a fixing part on which an upper structure is installed and the edge of the deck slab. and a removing step of removing the surface of the deck slab to a depth greater than the combined thickness of the reinforcing bar members and the covering thickness required to cover the reinforcing bar members with the filling member, prior to the reinforcing bar arranging step. . [Effects of the Invention]

[0011] The present invention Ru iron According to this method of reinforcing a reinforced concrete structure, the horizontal anchoring reinforcement of the reinforcing members is arranged along the edge between the edge of the deck slab and the fixing part where the superstructure is fixed, so that even if the superstructure is displaced so as to tip toward the edge, the main reinforcement of the reinforcing members can resist the bending moment generated in the deck slab. This ensures the strength of the reinforced concrete structure when a load is applied that causes the superstructure to tip toward the edge of the deck slab, and prevents damage to the deck slab. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view of a platform at a railway station, which is an example of the reinforced concrete structure 100 according to the first embodiment. [Figure 2] 1 is an explanatory diagram showing an example of a cross-sectional structure of a reinforced concrete structure 100 according to a first embodiment. [Figure 3] 1 is an explanatory diagram showing an example of a cross-sectional structure of a reinforced concrete structure 100 according to a first embodiment. [Figure 4] 1 is an explanatory diagram of a reinforcing bar member 20 arranged on a deck 10 of a reinforced concrete structure 100 according to the first embodiment. [Figure 5]10 is a plan view showing a modified example of the reinforcing bar member 20 according to the first embodiment. FIG. [Figure 6] 1 is a schematic diagram of a deck 10 of a reinforced concrete structure 100 according to a first embodiment. [Figure 7] FIG. 6(b) is an enlarged view of part B in FIG. [Figure 8] FIG. 7 is a plan view showing a modified example of the reinforcing bar member 20 shown in FIG. 6. [Figure 9] 2 is an enlarged view of a reinforcing bar member 20 according to the first embodiment. FIG. [Figure 10] 1 is an explanatory diagram of a cross-sectional structure of a reinforced concrete structure 100 that is a comparative example of the reinforced concrete structure 100 according to the first embodiment. [Figure 11] 1 is a diagram comparing the structure of a reinforcing bar member 20 according to the first embodiment with that of a reinforcing bar structure 1020 according to a comparative example. [Figure 12] 11 is a plan view showing the structure of a test specimen for comparing anchorage performance between the reinforcing bar member 20 according to the first embodiment and the bent portion 1021a of the main bar 1021 of the reinforcing bar structure 1020 of the comparative example shown in FIG. [Figure 13] 13 shows the measurement results of the anchorage force of the main reinforcements 21 and 1021 to the filling member 60 for each test specimen shown in FIG. 12. [Figure 14] 1 is an outline of a test specimen for evaluating the adhesion performance between the main reinforcement 21 of the reinforcing bar member 20 and the filling member 60 according to the first embodiment. [Figure 15] 15 shows the measurement results of the bond strength between the main reinforcements 21 and 1021 and the filling member 60 for each test specimen shown in FIG. 14. [Figure 16] 1 is an explanatory diagram of a process of reinforcing an existing reinforced concrete structure 100A with reinforcing members 20 and installing an upper structure 50. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, parts with the same reference numerals represent the same or equivalent parts, and this applies throughout the entire specification. Furthermore, the forms of components shown throughout the specification are merely examples, and the present invention is not limited to the descriptions in the specification. In particular, the combinations of components are not limited to the combinations in each embodiment, and components described in other embodiments can be applied to other embodiments. Furthermore, when multiple similar parts are distinguished by subscripts, the subscripts may be omitted if there is no need to distinguish or identify them. Furthermore, the size relationships between the components in the drawings may differ from those in reality.

[0014] Embodiment 1 FIG. 1 is a side view of a railway station platform, which is an example of a reinforced concrete structure 100 according to the first embodiment. In the first embodiment, the reinforced concrete structure 100 has platform doors erected at the track-side end of a deck 10 that forms the platform. The platform doors are arranged along an edge 13 of the deck 10 that is located along the tracks, and separate the area on the track side from the area above the deck 10 that forms the platform. The platform doors include, for example, a door section 51 that is arranged in accordance with the position of a train door, a door pocket 52 that retracts when the door section 51 is open, and a structural section 53 that is fixed to the deck 10. The platform doors are sometimes called superstructures 50.

[0015] Fig. 2 is an explanatory diagram showing an example of the cross-sectional structure of a reinforced concrete structure 100 according to the first embodiment. The cross section shown in Fig. 2 is perpendicular to the edge 13 and surface 14 of the deck slab 10. The reinforced concrete structure 100 comprises the deck slab 10, a support structure 11 that supports the deck slab 10 from below, and a superstructure 50 that stands on the deck slab 10. The superstructure 50 is fixed to a fixing portion 16 formed on the surface 14 of the end portion 12 of the deck slab 10. The fixing portion 16 is, for example, a plate-shaped member, and is formed with bolt holes and the like for fixing the superstructure 50.

[0016] The fixing portion 16 is fixed by passing fixing members 17 such as bolts through the deck slab 10. As a result, the upper structure 50, such as the platform doors, is fixed integrally to the deck slab 10. The fixing members 17 also support the lower structure 90 so that it is suspended from the platform. The lower structure 90 has wiring and the like arranged therein to supply the power necessary for the platform doors, for example.

[0017] Inside the deck 10, reinforcing members 20 are arranged along the surface 14. The reinforcing members 20 are arranged over an area extending from at least above the support structure 11 to the edge 13 side of the fixed portion 16 where the upper structure 50 is installed. Filler members 60 such as concrete are filled around the reinforcing members 20. The reinforcing members 20 and the filler members 60 together form the deck 10. The surface of the deck 10 is paved with paving members 62 such as tiles.

[0018] Fig. 3 is an explanatory diagram showing an example of a cross-sectional structure of a reinforced concrete structure 100 according to the first embodiment. The reinforced concrete structure 100 shown in Fig. 3 is an example different from the reinforced concrete structure 100 of Fig. 2, and may include a support structure 11 made of steel and an internal structure 70 of the deck slab 10. The internal structure 70 can be modified as appropriate depending on the performance required of the reinforced concrete structure 100. Even in this case, the reinforcing members 20 are arranged inside the deck slab 10 along the surface 14, and are arranged between the surface 14 and the internal structure 70.

[0019] FIG. 4 is an explanatory diagram of a reinforcing bar member 20 arranged in a deck 10 of a reinforced concrete structure 100 according to the first embodiment. FIG. 4(a) is a schematic diagram of the cross-sectional structure of the deck slab 10, and FIG. 4(b) is an explanatory diagram from a perspective perpendicular to the surface 14 of the deck slab 10. Note that FIG. 4(a) shows the AA section in FIG. 4(b). The reinforcing bar member 20 is configured in a lattice pattern by intersecting multiple main reinforcements 21 extending in the left-right direction in FIG. 4 and distribution reinforcements 22 extending in the up-down direction in FIG. 4. The main reinforcements 21 are arranged over an area extending from above the support structure 11 of the reinforced concrete structure 100 to near the edge 13. In the first embodiment, the main reinforcements 21 are arranged perpendicularly to the linearly extending edge 13 of the deck slab 10, but this is not the only possible configuration. The main reinforcements 21 may be arranged to extend from the support area 10A, where the deck slab 10 is fixed by the support structure 11, toward the edge 13.

[0020] As shown in the cross-sectional structures of Figures 2, 3, and 4(a), the deck slab 10 has a cantilever structure with the support structure 11 as the fixed end and the edge 13 as the free end. A bending moment is input to the deck slab 10 at an imaginary line 16A that indicates the center position of the fixed portion 16 to which the upper structure 50 is fixed. The main reinforcements 21 need only be arranged so as to share the tensile load caused by the bending moment that occurs when a load is applied to the cantilever. In other words, the main reinforcements 21 need only be arranged to extend from above the support structure 11 toward the edge 13. Furthermore, the multiple main reinforcements 21 do not necessarily need to be arranged in parallel, and the distance between one end of two main reinforcements 21 may be greater than the distance between the other end.

[0021] The main reinforcements 21 extend in a direction intersecting at least the edge 13, and a plurality of distribution reinforcements 22 are arranged in a direction intersecting the direction in which the main reinforcements 21 extend. The thickness of the main reinforcements 21 in a plan view is formed to be thicker than the distribution reinforcements 22. The plurality of distribution reinforcements 22 are formed to connect the side surfaces of the plurality of main reinforcements 21. The distribution reinforcements 22 are joined to the side surfaces of two adjacent main reinforcements 21, and distribute the tensile load acting on the main reinforcements 21 to the adjacent main reinforcements 21. In FIG. 4(b), the distribution reinforcements 22 are inclined from a direction perpendicular to the main reinforcements 21, but they may also extend in a direction perpendicular to the main reinforcements 21.

[0022] Of the multiple distribution reinforcements 22, the distribution reinforcements 22 arranged on the edge 13 side of the deck slab 10 are referred to as horizontal anchor reinforcements 22b. As shown in Figure 4(b), the horizontal anchor reinforcements 22b are arranged between the fixing part 16 to which the upper structure 50 is fixed and the edge 13 of the deck slab 10 in plan view. The horizontal anchor reinforcements 22b connect the sides of two adjacent main reinforcements 21 at the ends of the multiple main reinforcements 21 on the edge 13 side.

[0023] Fig. 5 is a plan view showing a modified example of the reinforcing bar member 20 according to the first embodiment. In the reinforcing bar member 20 shown in Fig. 5, the main reinforcements 21 and the distribution reinforcements 22 are arranged perpendicular to each other, and the grid is formed to be approximately square. Furthermore, in the reinforcing bar member 20 shown in Fig. 5, the main reinforcements 21 and the distribution reinforcements 22 are formed to have the same thickness. The reinforcing bar member 20 shown in Fig. 4(b) may be replaced with the reinforcing bar member 20 shown in Fig. 5. In the reinforcing bar member 20 shown in Fig. 5, the main reinforcements 21 and the distribution reinforcements 22 have the same structure, and therefore are configured to have the same strength even if the vertical and horizontal directions are reversed.

[0024] Fig. 6 is a schematic diagram of the deck 10 of the reinforced concrete structure 100 according to the first embodiment. Fig. 6(a) is a schematic diagram of the cross-sectional structure of the reinforced concrete structure 100, and Fig. 6(b) is a schematic diagram of the structure of the reinforced concrete structure 100 viewed from above. The reinforcing bar 20 shown in Fig. 6 is shown with the distribution bars 22 other than the anchoring horizontal bars 22b omitted. The function of the reinforcing bar 20 installed in the reinforced concrete structure 100 will be described below.

[0025] As shown in Figure 6(a), for example, on a platform at a railway station, a load f from people, luggage, etc. is distributed across the surface 14 of the deck slab 10. The end 12 of the deck slab 10 is not supported from below, and the deck slab 10 has a cantilever structure with the support structure 11 as the fixed end. Therefore, if an upper structure 50 such as a platform door is not installed at the end 12, and a uniformly distributed load equivalent to the distributed load f from passengers and luggage is applied to the surface 14 of the deck slab 10, the distribution of the bending moment generated in the deck slab 10 can be represented as shown by the curve M1 in Figure 6(a). In this case, the strength required for the deck slab 10 is represented by the straight line P1 in Figure 6(a).

[0026] When an upper structure 50, which is intended to be a platform door, which has been increasingly installed in recent years, is installed on the top surface of the end 12 of the deck slab 10, the platform door is displaced so as to tip toward the tracks due to negative pressure caused by the passing of a train. In other words, a bending moment m is applied to the end 12 of the deck slab 10 so as to bend the deck slab 10 downward. Therefore, the distribution of the bending moment generated in the deck slab 10 can be represented as the curve M2 in Figure 6(a).

[0027] Because the stress generated in the deck 10 is proportional to the bending moment, a reinforced concrete structure 100 having a superstructure 50 such as platform doors must ensure greater strength than conventional structures in order to withstand the bending moment distribution represented by curve M2. In other words, the strength of the deck 10 required when a superstructure 50 such as platform doors is installed on the reinforced concrete structure 100 is indicated by line P2 in FIG. 6(a). The reinforced concrete structure 100 according to the first embodiment can increase the strength of the deck slab 10 from line P1 to line P2 by installing reinforcing members 20 in the deck slab 10.

[0028] As shown in FIG. 6(b), the deck slab 10 of the reinforced concrete structure 100 according to the first embodiment has panel-shaped reinforcing members 20 arranged along the surface 14, allowing the reinforcing members 20 to share the tensile stress caused by the bending moment that occurs in the deck slab 10. In particular, because the anchoring cross bars 22b are arranged along the edge 13 of the deck slab 10, the distributed load f and bending moment m applied to the filling members 60 that make up the deck slab 10 can be transmitted from the anchoring cross bars 22b to the multiple main reinforcements 21. Because the anchoring cross bars 22b are arranged closer to the edge 13 than the fixing parts 16 of the superstructure 50, the load due to the bending moment m caused by the load applied to the superstructure 50 can be borne by the reinforcing members 20 via the filling members 60.

[0029] Generally, the reinforcing bar members 20 are stronger against tensile stress than the filling members 60 made of concrete or the like, and by installing the reinforcing bar members 20 as shown in Figure 6, the deck slab 10, which has a cantilever structure, can be strengthened. In other words, the distributed load f and bending moment m applied to the deck slab 10 are transmitted to the filling members 60 that make up the deck slab 10.

[0030] Because the main reinforcements 21 extend from the fixed end to the free end of the cantilever beam structure, the load applied to the filling member 60 is usually transmitted to the main reinforcements 21 depending on the adhesive force between the filling member 60 and the surface of the main reinforcements 21. In this case, if the adhesive force between the filling member 60 and the main reinforcements 21 is not sufficiently strong, the main reinforcements 21 will be pulled out of the filling member 60 and will not be able to fully bear the load applied to the filling member 60. However, in the reinforced concrete structure 100 according to the first embodiment, the reinforcing bar 20 includes the anchoring horizontal reinforcements 22b. Therefore, the load f and the bending moment m applied to the filling member 60 are transmitted to the multiple main reinforcements 21 via the anchoring horizontal reinforcements 22b. This allows the main reinforcements 21, which are resistant to tensile forces, to bear the distributed load f and bending moment m. Note that in the first embodiment, the filling member 60 is made of concrete, flowable concrete, high-strength concrete, fiber-reinforced concrete, mortar, non-shrink mortar, fiber-reinforced mortar, polymer cement mortar, or the like. Furthermore, the reinforcing bar member 20 is not limited to a steel material, and may be made of a high-strength material other than metal, such as carbon fiber FRP, aramid fiber FRP, or glass fiber FRP.

[0031] In Figure 6, the distribution bars 22 of the reinforcing bar member 20 are omitted, but the distribution bars 22a other than the anchoring horizontal bars 22b extend in a direction intersecting the main reinforcements 21 and connect multiple main reinforcements 21 together. Therefore, the load applied to the filling members 60 that make up the deck slab 10 is transmitted to the main reinforcements 21 via the distribution bars 22a. Therefore, the distributed load f applied to the surface 14 of the deck slab 10 on the support structure 11 side relative to the superstructure 50, such as platform doors, is transmitted to the main reinforcements 21, thereby enhancing the effect of the reinforcing bar member 20 in improving the strength of the deck slab 10.

[0032] FIG. 7 is an enlarged view of part B in FIG. 6(b). In the reinforced concrete structure 100 according to the first embodiment, the fixing portion 16 is fixed using a fixing member 17 that penetrates the deck slab 10. The fixing portion 16 and the fixing member 17 are installed on the deck slab 10 after the reinforcing bar members 20 have been placed and the filling member 60 has been filled. Therefore, as shown in FIG. 7, there are cases where the reinforcing bar members 20 are partially removed. Even in this case, the strength of the deck slab 10 can be ensured because the multiple main reinforcements 21 of the reinforcing bar members 20 are connected by the anchoring horizontal bars 22b, and the main reinforcements 21 adjacent to the cut main reinforcement 21 can bear the load.

[0033] FIG. 8 is a plan view showing a modified example of the reinforcing bar member 20 shown in FIG. 6. In the reinforcing bar member 20 of FIG. 8, the anchoring horizontal bars 22b are inclined relative to the edge 13 of the deck slab 10, but the strength of the deck slab 10 can be ensured in the same way as in FIG. 6. Note that the reinforcing bar member 20 shown in FIG. 8 is a schematic representation of the reinforcing bar member 20 shown in FIG. 6(b), for example. The reinforcing bar member 20 shown in FIG. 8 is formed, for example, by forming multiple slits in a single steel plate and widening the slits to form a lattice pattern. As long as the reinforcing bar member 20 includes at least the main bars 21 and the anchoring horizontal bars 22b that connect the main bars 21 together, it is possible to ensure the strength of the deck slab 10 as described using FIG. 6.

[0034] The reinforcing bar members 20 according to the first embodiment are in the form of panels each about 2 m wide, and are installed, for example, in a row on the deck slab 10 of a station platform. Adjacent reinforcing bar members 20 may abut each other at their end faces, or may have engaging portions that allow them to engage with each other.

[0035] FIG. 9 is an enlarged view of the reinforcing bar member 20 according to the first embodiment. FIG. 9(a) is an enlarged plan view of the main reinforcement 21 of the reinforcing bar member 20, showing a case where the protrusion protrudes 2 mm from the side surface 24. FIG. 9(b) is an enlarged plan view of the main reinforcement 21 of the reinforcing bar member 20, showing a case where the protrusion protrudes 5 mm from the side surface 24. As shown in FIG. 9, the main reinforcement 21 of the reinforcing bar member 20 may have protrusions 23 on its side surface. By forming the protrusions 23 on the side surface 24, the main reinforcement 21 is firmly connected to the filling member 60. This makes the main reinforcement 21 less likely to be pulled out of the filling member 60. In other words, the load applied to the filling member 60 is more easily transmitted to the main reinforcement 21, and the main reinforcement 21 can bear a tensile load more easily than if the protrusions were not formed, thereby improving the strength of the deck slab 10. 4 and 5, the distribution bars 22 and the horizontal anchoring bars 22b may also have protrusions 23 on their side surfaces 25. This makes the connection between the reinforcing bar members 20 and the filling members 60 stronger.

[0036] The reinforcing bar member 20 may also be manufactured by processing a material, such as a checkered steel plate, that has protrusions on its upper and lower surfaces. In this case, the reinforcing bar member 20 has protrusions formed on at least one of its upper and lower surfaces. The protrusions formed on the upper or lower surface of the reinforcing bar member 20 also improve the adhesion between the reinforcing bar member 20 and the filling member 60.

[0037] 10 is an explanatory diagram of a cross-sectional structure of a reinforced concrete structure 1000 that is a comparative example of the reinforced concrete structure 100 according to the first embodiment. In the comparative reinforced concrete structure 1000, a reinforcing bar structure 1020 is installed along the surface of a deck slab 1010, in which deformed steel bars are crossed and combined and bound with iron wire. In the reinforcing bar structure 1020, deformed steel bars that serve as main reinforcements 1021 and deformed steel bars that serve as distribution reinforcements 1022 are arranged so that they overlap in the vertical direction. Therefore, when attempting to ensure the same strength as a single plate-shaped reinforcing bar such as the reinforcing bar member 20 according to the first embodiment, the reinforcing bar structure 1020 of the comparative example will have a greater thickness than the reinforcing bar member 20 according to the first embodiment.

[0038] Furthermore, in the steel reinforcement structure 1020 of the comparative example, the bonding strength between the distribution reinforcement 1022 and the main reinforcement 1021 is low, so that the load is not easily transmitted from the distribution reinforcement 1022 to the main reinforcement 1021. Therefore, when the main reinforcement 1021 is installed along the surface 14 of the deck slab 1010, the main reinforcement 1021 is easily pulled out of the filling member 60 that surrounds it. Therefore, as shown in FIG. 10 , the tip end of the main reinforcement 1021 of the steel reinforcement structure 1020 is installed so as to wrap around the edge of the internal structure 70 at the end 1012 of the deck slab 1010. The bent portion 1021a of the main reinforcement 1021 of the steel reinforcement structure 1020 functions in the same way as the anchoring horizontal reinforcement 22b according to the first embodiment, but the area in which the steel reinforcement structure 1020 is installed within the reinforced concrete structure 1100 is wide. Therefore, when installed on the platform of an existing station, it may interfere with the vehicle limit L through which the vehicle passes or the substructure 91 installed below the deck 10 shown in Figure 3, and the steel structure 1020 of the comparative example has limitations in its application as reinforcement for the deck 10 of a station platform for the installation of platform doors.

[0039] FIG. 11 is a structural comparison diagram between the reinforcing bar member 20 according to the first embodiment and a reinforcing bar structure 1020 according to a comparative example. FIG. 11(a) shows a cross section perpendicular to the main reinforcement bars 21 of the reinforcing bar member 20 according to the first embodiment, and FIG. 11(b) shows a cross section perpendicular to the main reinforcement bars 1021 of the reinforcing bar structure 1020 according to the comparative example. The reinforcing bar member 20 according to the first embodiment is in the form of a panel with a lattice pattern, and the main reinforcement bars 21, the distribution reinforcement bars 22, and the anchorage horizontal reinforcement bars 22b are arranged on the same plane. Therefore, the reinforcing bar member 20 has a thickness H1 across the entire deck slab 10. On the other hand, in the reinforcing bar structure 1020, the main reinforcement bars 1021 and the distribution reinforcement bars 1022 are arranged one above the other, so the thickness H2 is the sum of the diameter D1 of the main reinforcement bars 1021 and the diameter D2 of the distribution reinforcement bars 1022. Therefore, when the cross-sectional areas of the main reinforcements 21 and 1021 and the distribution reinforcements 22 and 1022 are matched to ensure equivalent strength, the thickness H1 of the steel reinforcement member 20 in embodiment 1 is thinner than the thickness H2 of the steel reinforcement structure 1020 in the comparative example.

[0040] The reinforcing bar member 20 according to the first embodiment is configured to be thinner than the reinforcing bar structure 1020 according to the comparative example, and therefore, the area it occupies inside the deck slab 10 can be reduced while maintaining strength. By configuring the reinforcing bar member 20 in this manner, for example, when applying the reinforcing bar member 20 according to the first embodiment to an existing reinforced concrete structure 100, it is possible to reduce the amount of filler member 60 that needs to be removed from the deck slab 10 of the existing reinforced concrete structure 100. Furthermore, even in the case of a newly constructed reinforced concrete structure 100, by reducing the thickness H1 of the reinforcing bar member 20, it is possible to reduce the size of the reinforced concrete structure 100 and the amount of filler member 60 used.

[0041] (Anchorage strength of main reinforcement 21) Fig. 12 is a plan view showing the structure of a test specimen for comparing the anchorage performance between the reinforcing bar member 20 according to embodiment 1 and the bent portion 1021a of the main reinforcement bars 1021 of the reinforcing bar structure 1020 of the comparative example shown in Fig. 10. In Fig. 12, test specimen N is a test specimen corresponding to the reinforcing bar member 20 according to embodiment 1. That is, as shown in Fig. 12, test specimen N includes two main reinforcement bars 21 and anchoring horizontal bars 22b that connect the side surfaces of the two main reinforcement bars 21 at their tip portions.

[0042] 12, specimen J corresponds to the main reinforcement 1021 of the reinforced concrete structure 1020 according to the comparative example. That is, as shown in FIG. 12(b), specimen J has a bent portion 1021a formed at the tip of the main reinforcement 1021. This structure corresponds to the main reinforcement 1021 of the reinforced concrete structure 1020 shown in FIG.

[0043] Figure 13 shows the measurement results of the anchorage force of the main reinforcement bars 21 and 1021 to the filling member 60 for each test specimen shown in Figure 12. The dotted lines in Figure 13 represent a load F of 35.5 kN, which corresponds to 95% of the standard yield load of the reinforcing steel, applied to each test specimen. Curves p, q, and r in Figure 13 show the relationship between the displacement and load F of test specimen N shown in Figure 12(a). Curves s, t, and u in Figure 12 show the relationship between the displacement and load F of test specimen J shown in Figure 12(b).

[0044] 13, when compared with test specimen J corresponding to the comparative steel reinforcement structure 1020, test specimen N corresponding to the reinforcing bar member 20 according to embodiment 1 exhibited the same or smaller displacement when the same load F was applied. In other words, by installing the reinforcing bar member 20 according to embodiment 1 on the deck slab 10, the deck slab 10 can exhibit anchorage strength that is equal to or greater than that when the conventional reinforcing bar structure 1020 is applied.

[0045] (bond strength of main reinforcement 21) FIG. 14 shows an overview of test specimens used to evaluate the adhesion performance between the main reinforcement bars 21 and the filling member 60 of the reinforcing bar member 20 of embodiment 1. Test specimens A, B1, B2, C, and D were formed with a width of 15 mm and a thickness of 9 mm, as shown in FIG. 9. Test specimens A, B1, and B2 were processed from ordinary steel plates with smooth surfaces, while test specimens C and D were processed from checkered steel plates with uneven surfaces. Furthermore, test specimens A, B1, C, and D had 2 mm protrusions 23 formed on their sides, as shown in FIG. 9(a), and test specimen B2 had 5 mm protrusions 23 formed on their sides, as shown in FIG. 9(b).

[0046] The surfaces of specimens B1, B2, and D were plated or epoxy painted. Plating or epoxy painting on the surface of the main reinforcement 21 is generally intended to protect the metal material from corrosion. When epoxy painting is applied, the adhesion between the main reinforcement 21 and the filling member 60 generally decreases.

[0047] Specimen E corresponds to the comparative example of reinforcing bar structure 1020, and is made of deformed reinforcing bars D13 (diameter approximately 13 mm). Specimen E is not particularly painted or plated.

[0048] FIG. 15 shows the measurement results of the bond strength between the main reinforcement bars 21 and 1021 and the filling member 60 for each test specimen shown in FIG. 14. The bond strength shown in FIG. 15 shows the value of the load F when a pull-out load F was applied to the ends of test specimens A, B1, B2, C, and D equipped with the protrusions 23 shown in FIG. 9, resulting in a displacement of 0.04 mm. The bar graph shows the average value of the measurement results obtained for each test specimen. According to the results shown in FIG. 15, test specimens A, B1, B2, C, and D, which have the structure equipped with the reinforcing bar member 20 according to embodiment 1, have bond strengths equal to or greater than that of test specimen E, which corresponds to the reinforcing bar structure 1020 of the comparative example.

[0049] Furthermore, even in the case of specimen D, which was coated with epoxy paint, which is detrimental to adhesion strength, by adding 2 mm high protrusions 23 to the sides of the main reinforcement 21 of the reinforcing bar member 20, adhesion strength equivalent to that of specimen E, a comparative example, was obtained. When the surface of the reinforcing bar member 20 is plated, and further, by adding 5 mm protrusions 23 to the sides of the main reinforcement 21, as in specimen B2, it was found that an even higher adhesion strength than that of specimen E can be obtained.

[0050] As described above, the reinforcing steel member 20 according to embodiment 1 can be applied to reinforced concrete structures 100 in a variety of environments because it can obtain sufficient adhesion strength even when plated or painted for purposes such as corrosion prevention.

[0051] Next, a construction method for the reinforced concrete structure 100 according to the embodiment 1 will be described. Note that the following construction method for the reinforced concrete structure 100 will be described as an example for a case where reinforcement of the deck slab 10 is required when installing platform doors on the platform of an existing station.

[0052] (Method of reinforcing reinforced concrete structure 100) FIG. 16 is an explanatory diagram of the process of reinforcing an existing reinforced concrete structure 100A with reinforcing members 20 and installing an upper structure 50. First, as shown in FIG. 16(a), the pavement that forms the surface 14 is removed from the existing deck slab 10. Then, the filler member 60 of the deck slab 10 is removed to the depth required to install the reinforcing members 20. In other words, the area K from above the support structure 11 to the edge 13 of the deck slab 10 shown in FIG. 16(a) is chipped, and concrete and the like are removed. This process is called the removal process.

[0053] Next, as shown in FIG. 16(b), the reinforcing bar members 20 are placed in the area K. For example, the reinforcing bar members 20 are placed on the blocks 80 arranged on the bottom surface 61 of the area K so as to be arranged at a predetermined distance from the bottom surface 61. At this time, since the reinforcing bar members 20 are panel-shaped members with a lattice pattern, no assembly work is required on-site; they only need to be arranged and fixed. This process is called the reinforcing bar arrangement process. According to the reinforcing bar arrangement process, the time required to arrange the reinforcing bar members 20 can be significantly reduced compared to the time required to assemble a conventional reinforced concrete structure 1020.

[0054] After the reinforcing bar members 20 are placed, the region K is filled with a filling member 60 such as concrete. The surface of the filled concrete or the like is finished to be flat. This is called the filling step.

[0055] After the filling member 60 has solidified, as shown in FIG. 16(c), the deck slab 10 is drilled to form holes 19 through which the fixing members 17 are inserted. When the holes 19 are formed, some of the main reinforcement 21 or distribution reinforcement 22a of the reinforcing bar member 20 may be cut. Then, the fixing members 16 are fixed to the surface of the deck slab 10 by the fixing members 17. This is referred to as the fixing member installation process. The fixing members 16 are formed on the upper surface of the end portion 12 of the deck slab 10. In the horizontal direction of FIG. 16(c), the fixing members 16 are installed so that the anchoring cross bars 22b of the reinforcing bar member 20 are positioned between the end edge 13 and the fixing members 16. Furthermore, paving to form the surface 14 of the deck slab 10 may be performed simultaneously with, before, or after the fixing member installation process. This process is referred to as the paving process.

[0056] After the fixed part 16 is installed, an upper structure 50 such as platform doors is installed on the fixed part 16.

[0057] According to the method for constructing a reinforced concrete structure according to the first embodiment, the time required to install the reinforcing members 20 is reduced, making it possible to carry out construction during the short time when train service is suspended, for example. Another advantage is that the construction period for the reinforced concrete structure 100 is also reduced. Note that although an existing reinforced concrete structure 100 has been described in FIG. 16, the reinforcing members 20 can also be applied to a newly constructed reinforced concrete structure 100. In a newly constructed reinforced concrete structure 100, the removal step described in FIG. 16(a) is omitted.

[0058] Although the present invention has been described above based on the embodiments, the present invention is not limited to the configurations of the above-described embodiments. In particular, the combination of components is not limited to the combinations in the embodiments, but can be modified as appropriate. Furthermore, it should be noted that the gist (technical scope) of the present invention also includes various modifications, applications, and uses that may be made by those skilled in the art as needed. [Explanation of symbols]

[0059] 10 deck slab, 10A support area, 11 support structure, 12 end, 13 edge, 14 surface, 16 fixing part, 16A virtual line, 17 fixing member, 19 hole, 20 reinforcing member, 21 main reinforcement, 22 distribution reinforcement, 22a distribution reinforcement, 22b horizontal anchorage reinforcement, 23 protrusion, 24 side, 25 side, 50 superstructure, 51 door part, 52 door pocket, 53 structural part, 60 filling member, 61 bottom, 62 paving member, 70 internal structure, 80 block, 90 substructure, 91 substructure, 100 reinforced concrete structure, 100A reinforced concrete structure, 1000 reinforced concrete structure, 1010 deck slab, 1012 end, 1020 reinforcing structure, 1021 main reinforcement, 1021a Bending section, 1022 distribution bar, 1100 reinforced concrete structure, A specimen, B1 specimen, B2 specimen, C specimen, D specimen, D13 deformed bar, E specimen, F pull-out load, H1 thickness, H2 thickness, K area, L vehicle limit, f distributed load, m bending moment.

Claims

1. a support structure that supports the upper structure from below; A method for reinforcing a reinforced concrete structure comprising: a deck slab formed by projecting laterally from the support structure; a reinforcing bar arrangement process in which a reinforcing bar member having a plurality of main reinforcements arranged parallel to one another and a plurality of anchoring cross bars connecting the sides of adjacent main reinforcements is arranged from above the support structure of the deck slab to the end of the deck slab, and the plurality of anchoring cross bars are arranged along the edge of the deck slab away from the support structure; a filling step in which a filling member is filled around the reinforcing bar member; a fixing portion installation process in which the fixing portion is installed so that the plurality of anchorage horizontal reinforcements of the reinforcing bar member are arranged between the fixing portion on which the upper structure is installed and the edge of the deck slab, A method for reinforcing a reinforced concrete structure, further comprising, before the reinforcing bar placement step, a removal step of removing the surface of the deck slab to a depth greater than the combined thickness of at least the thickness of the reinforcing bar member and the cover thickness required to cover the reinforcing bar member with the filling member.

2. The upper structure includes:

2. The method for reinforcing a reinforced concrete structure according to claim 1, wherein the reinforced concrete structure is a platform screen door erected on a platform of a railway station.

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