Reinforcement structure

Abstract

To provide a reinforcement structure etc. that can be easily constructed.SOLUTION: A reinforcement structure 1 for reinforcing a rigid-frame bridge in which piers 110 and a superstructure 120 are rigidly connected, has: tendons 2 arranged so as to straddle a joint between the piers 110 and the superstructure 120 and provided in a vertical direction so as to be exposed along the piers 110; and brackets 3 for fixing upper and lower ends of the tendons 2 to a bridge. The lower end of the tendon 2 is fixed to the pier 110 by the bracket 3, and the upper end of the tendon 2 is fixed to the superstructure 120 by the bracket 3.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a reinforcing structure for bridges and the like.

Background Art

[0002] For the bending moment generated by various factors such as earthquakes and temperature loads, it may be necessary to reinforce the bridge. For example, when the sectional force changes due to the widening construction of the superstructure and reinforcement is required, or when additional sectional force is generated at the pier by performing external cable reinforcement due to the deterioration of the bridge, such reinforcement is also required. In Patent Document 1, at the joint between the pier made of a steel pipe and the superstructure, an inner cylinder is provided inside the pier, the pier is surrounded by an outer jacket, concrete is filled between the inner surface of the pier and the inner cylinder, and a high-toughness cement composite material is filled between the outer surface of the pier and the outer jacket to reinforce the joint between the pier and the superstructure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above-described reinforcing structure has a problem that it takes time and effort in construction, such as the installation of the inner cylinder and the outer jacket, and the filling of concrete and the like.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a reinforcing structure and the like that can be easily constructed.

Means for Solving the Problems

[0006] The present invention, which solves the aforementioned problems, is a bridge reinforcement structure comprising: a tensioning member arranged to straddle the reinforcement area and provided vertically so as to be exposed along the bridge pier of the bridge; and fixing parts that fix the upper and lower ends of the tensioning member to the bridge. The aforementioned bridge is a rigid-frame bridge in which the bridge piers and the superstructure are rigidly connected. The tensioning member is positioned to straddle the joint between the bridge pier and the superstructure of the bridge, the lower end of the tensioning member is fixed by the fixing part to a surface of the bridge pier perpendicular to the bridge axis, and the upper end of the tensioning member is fixed by the fixing part to a surface of the superstructure perpendicular to the bridge axis.

[0007] In this invention, compressive force (prestress) introduced by vertical tensioning members arranged along the bridge pier can be used to reinforce necessary areas of the bridge, such as the joint between the bridge pier and the superstructure, and the stepped sections of the bridge pier. This reinforcement structure is simple and lightweight, requiring no concrete filling, and since the tensioning members are externally mounted and exposed along the bridge pier, construction is not time-consuming.

[0008] For example, the superstructure has a box girder, and the tensioning member is positioned by passing it through a hole in the lower slab of the box girder. 。 This invention makes it possible to easily reinforce the joint between the bridge pier and the superstructure against bending moments in the vertical plane in the bridge axis direction. If the superstructure is a box girder, tensioning members can be passed through holes formed in the lower deck slab. Such reinforcement is particularly effective in rigid-frame bridges where the bridge pier and the superstructure are rigidly connected. [Effects of the Invention]

[0010] The present invention provides a reinforcing structure and the like that can be easily constructed. [Brief explanation of the drawing]

[0011] [Figure 1] A diagram showing bridge 100. [Figure 2] A diagram showing the connection point between pier 110 and superstructure 120. [Figure 3] A diagram showing bracket 3. [Figure 4] A diagram showing bridge pier 200. [Figure 5] A diagram showing paragraph B. [Modes for carrying out the invention]

[0012] Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

[0013] [First Embodiment] Figure 1 shows a bridge 100 to which a reinforcing structure according to an embodiment of the present invention is applied. This bridge 100 is a rigid-frame bridge having a rigid frame structure in which the bridge piers 110 and the superstructure 120 are rigidly connected.

[0014] Figure 2(a) shows a vertical cross-section in the bridge axis direction at the joint between the bridge pier 110 and the superstructure 120. The bridge 100 in this embodiment is a box girder bridge having a box girder as the superstructure 120, and has an upper deck slab 121 and a lower deck slab 122 formed of concrete or the like.

[0015] The pier 110 is a column member formed of concrete or the like, and a transverse girder 123 is formed at a position corresponding to the pier 110 within the box girder.

[0016] The reinforcing structure 1 of this embodiment reinforces the joint between the existing bridge pier 110 and the superstructure 120 against bending moments M in the vertical plane in the bridge axis direction that are applied to the superstructure 120 due to various factors such as earthquakes and temperature loads, and comprises tensioning members 2 and brackets 3.

[0017] The tension member 2 is arranged so as to straddle the joint portion (reinforcement portion) between the pier 110 and the superstructure 120, and is provided vertically so as to be exposed along the pier 110. In the tensioned state, the upper and lower ends of the tension member 2 are fixed to the lateral girder 123 and the pier 110 of the bridge 100 by brackets 3. The upper end of the tension member 2 is fixed to the surface along the direction orthogonal to the bridge axis of the lateral girder 123, and the lower end of the tension member 2 is fixed to the surface along the direction orthogonal to the bridge axis of the pier 110. The direction orthogonal to the bridge axis is the direction orthogonal to the bridge axis direction in plan view, and corresponds to the direction of the normal to the plane of Fig. 2(a).

[0018] Fig. 2(b) is a view showing a vertical section taken along line A-A in Fig. 2(a). A plurality of reinforcement structures 1 are provided at intervals in the direction orthogonal to the bridge axis (corresponding to the left-right direction in Fig. 2(b)). The tension members 2 of each reinforcement structure 1 are arranged by passing through holes 124 separately formed in the lower floor slab 122. The reinforcement structure 1 is external, and the tension members 2 and the brackets 3 are exposed, but the durability can be improved by covering the tension members 2 with a covering material (not shown). Also, for water stoppage, a water stop material (not shown) can be provided in the holes 124.

[0019] Fig. 3 is a view showing the bracket 3. The bracket 3 is a fixing portion for fixing the upper and lower ends of the tension member 2. In the present embodiment, a pair of H-shaped steels 31 are arranged with the member axis direction being the vertical direction, and the upper and lower end faces of these H-shaped steels 31 are each fixed to a single plate 32 by welding or the like.

[0020] Holes 321 are formed in the plate 32. The upper end of the tension member 2 is passed through the holes 321 of the upper and lower plates 32 of the bracket 3 fixed to the lateral girder 123 with bolts or the like, and is fixed to the upper plate 32 by a fixing tool (not shown). The lower end of the tension member 2 is similarly passed through the holes 321 of the upper and lower plates 32 of the bracket 3 fixed to the pier 110 with bolts or the like, and is fixed to the lower plate 32 by a fixing tool (not shown).

[0021] By fixing both ends of the tension member 2 in the tensioned state across the joint between the pier 110 and the superstructure 120 in this way, the joint between the pier 110 and the superstructure 120 can be reinforced by the compressive force (prestress), the plasticization of the vertical reinforcing bars (not shown) embedded in the joint can be controlled, and the rigid connection state between the pier 110 and the superstructure 120 can be maintained.

[0022] As described above, according to this embodiment, using the compressive force introduced by the tension member 2 arranged along the pier 110, reinforcement can be carried out for the bending moment M at the joint between the pier 110 and the superstructure 120. The reinforcement structure 1 has a simple and lightweight configuration that does not require filling with concrete or the like. Also, since the tension member 2 is an external member that is exposed along the pier 110, construction is not laborious, and inspections for repair and maintenance management are also simple.

[0023] Moreover, the bridge 100 of this embodiment is a box girder bridge, and the tension member 2 can be arranged through the holes 124 in the bottom slab 122. The reinforcement structure 1 is particularly effective in a continuous girder bridge in which the pier 110 and the superstructure 120 are rigidly connected, and the joint between the pier 110 and the superstructure 120 can be reinforced by the compressive force of the tension member 2 against the bending moment M.

[0024] However, the present invention is not limited to the above embodiment. For example, the bracket 3 is not limited to the above configuration, and any member that can fix the upper and lower ends of the tension member 2 to the pier 110 or the superstructure 120 may be used. Also, the superstructure 120 is not limited to the above box girder, and any structure that is rigidly connected to the pier 110 and has a surface along the direction orthogonal to the bridge axis for fixing the upper end of the tension member 2 may be used.

[0025] Also, when the pier 110 is a cylindrical column member having a cavity, although construction becomes slightly more difficult, the reinforcement structure 1 can also be provided on the inner surface (the inner surface along the direction orthogonal to the bridge axis) in addition to the outer surface of the pier 110.

[0026] Furthermore, the locations of bridge reinforcement by the reinforcement structure 1 are not limited to the joints between the bridge piers 110 and the superstructure 120 as described above. Below, an example with different reinforcement locations will be described as a second embodiment. The second embodiment will mainly describe the differences from the first embodiment, and similar components will be denoted by the same reference numerals in the figures, etc., and their explanation will be omitted.

[0027] [Second Embodiment] Figures 4(a) and 4(b) show a pier 200 to which the reinforcing structure 1 is applied, and represent the pier 200 as viewed from the plane along the bridge axis and the plane perpendicular to the bridge axis, respectively. The pier 200 is a column member made of reinforced concrete. The pier 200 may be a pier of the rigid-frame bridge described earlier, or it may be a pier of any other type of bridge. It may or may not be rigidly connected to the superstructure.

[0028] Figure 5(a) is a view of the vertical cross-section of the pier 200 in the direction of the bridge axis. In this embodiment, the reinforcing structure 1 is provided to reinforce the stepped section B of the pier 200. The stepped section B is a part of the pier 200, such as the middle section in the height direction, where the number (density) of reinforcing bars 210 is reduced.

[0029] As shown in Figure 5(b), the bending moment Mt (in this example, the bending moment in the vertical plane in the direction of the bridge axis) applied to the pier 200 by the horizontal force during an earthquake is maximum at the base of the pier 200 and decreases as it approaches the top of the pier 200.

[0030] The number of reinforcing bars 210 is reduced on the top side of the pier 200 in accordance with the distribution of the bending moment Mt. However, in this case, the yield bending strength My of the pier 200 changes in steps according to the number of reinforcing bars 210, so the bending moment Mt is more likely to exceed the yield bending strength My at the stepped section B, making it easier for damage to occur.

[0031] The reinforcing structure 1 reinforces the stepped section B, and the tensioning member 2 is positioned to straddle the stepped section B (reinforcement area) and is provided vertically so as to be exposed along the pier 200. When the tensioning member 2 is in a tensioned state, its upper and lower ends are fixed by brackets 3 to the surface of the pier 200 in the direction perpendicular to the bridge axis.

[0032] As shown in Figure 4(b), multiple reinforcing structures 1 are provided at intervals in the direction perpendicular to the bridge axis. The number of reinforcing structures 1 can be determined according to the bending moment Mt and yield bending strength My.

[0033] In this embodiment, the stepped section B of the bridge pier 200 can be reinforced by fixing both ends of the tensioned tension member 2 across the stepped section B, thereby preventing damage to the stepped section B of the bridge pier 200 due to bending moment Mt applied to the bridge pier 200 by horizontal forces such as earthquakes.

[0034] In this embodiment, the lower end of the tensioning member 2 is fixed to the side surface of the pier 200 by a bracket 3. However, the lower end of the tensioning member 2 can also be embedded in the footing (not shown) of the pier base and fixed to the footing by an anchoring body (fixing part) provided at the lower end. Furthermore, although the reinforcing structure 1 is provided on the surface of the pier 200 in the direction perpendicular to the bridge axis, it can also be provided on the surface of the pier 200 in the direction of the bridge axis, depending on the circumstances. Also, as described above, if the pier 200 is a cylindrical column member with a cavity, the reinforcing structure 1 can be provided on the inner surface of the pier 200 as well as the outer surface.

[0035] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but the present invention is not limited to these examples. It will be obvious to those skilled in the art that various modifications or alterations can be conceived within the scope of the technical idea disclosed herein, and these will naturally also fall within the technical scope of the present invention. [Explanation of Symbols]

[0036] 1: Reinforcement structure 2: Tensile material 3: Bracket 100:Bridge 110, 200: Bridge foot 120: Upper Works 121: Bed Version 122: Getting Out of Bed Version 123: Horizontal Gauge 124: Kong B: paragraph part

Claims

1. A bridge reinforcement structure, A tensioning member is positioned to straddle the reinforced area and is provided vertically so as to be exposed along the bridge pier of the bridge, Fixing parts for fixing the upper and lower ends of the tensioning member to the bridge, It has, The aforementioned bridge is a rigid-frame bridge in which the bridge piers and the superstructure are rigidly connected. The tensioning member is positioned to straddle the joint between the bridge pier and the superstructure of the bridge. The lower end of the tensioning member is fixed by the fixing part to the surface of the bridge pier in the direction perpendicular to the bridge axis, The upper end of the tensioning member is fixed by the fixing portion to a surface of the superstructure that is perpendicular to the bridge axis.

2. The superstructure has a box girder, The reinforcing structure according to claim 1, characterized in that the tensioning member is arranged by passing it through a hole in the lower floor slab of the box girder.

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