JP2001081726A - Method and structure for re-laying steel floor slab of concrete floor slab bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and structure for re-laying steel floor slab of a concrete floor slab bridge capable of re-laying the floor slab in a short traffic regulation time and widening the width without changing the lower structure of the bridge by reducing the weight of the floor slab. SOLUTION: After a support replacement structural body 30 is fixed to a main girder 10 to support a floor slab position part 22 between main girders of a concrete floor slab 20 from the lower face side. The connection part 21 to be supported is cut off from the floor slab position part 22 between main girders and the floor slab position part 22 supported by the support replacement structural body 30 is removed and a fixed cap is put on the connection part 21 to be supported and fixed thereto. The support replacement structural body 30 is released from fixture to the main girder 10 and raised up to a position where the replacement steel plate 33A coincides with the top plate of the fixed cap. Further, the support replacement structural body 30 is fixed again and the replacement steel plate 33A is connected to the top plate and floor slab position part 22 between main girders is replaced with the support replacement structural body 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete slab bridge for replacing a concrete slab with a steel slab of a bridge such as a viaduct which supports an RC slab by a main girder extending in the bridge axis direction. The present invention relates to a method for replacing a steel slab with a steel slab and a structure for replacing a concrete slab bridge with a steel slab.

[0002]

2. Description of the Related Art As a bridge structure such as a viaduct, there is a bridge structure in which a reinforced concrete slab (hereinafter referred to as an RC slab) is supported by a main girder extending in the bridge axis direction. Main girder and R
With the C slab, a dowel implanted in the main girder is buried in the RC slab and coupled to transmit shear force.

At the time of construction, RC slabs are constructed by placing concrete in a formwork at the site and placing concrete, so that the work is troublesome and the construction period is long. Further, the weight is heavy and the dead load is large.

Recently, the number of bridges that need to be replaced due to aging of such RC slabs is increasing. However, the replacement of RC slabs is performed by chopping and removing existing RC slabs.
It is common to rebuild the same RC slab as before on the main girder.

[0005]

However, the disassembly and removal of the existing RC slab, particularly the part to be supported by the main girder (the joint part with the main girder), is extremely troublesome, and the new RC slab is not easily dismantled. The construction of an RC floor slab also requires a long time since it is necessary to provide a formwork, assemble a reinforcing bar inside and cast concrete, as in the case of new production.

For this reason, there is a problem that the traffic regulation period that must be performed during the replacement of the floor slab of the bridge extends for a long time.

Recently, it is desired to increase the width of the slab when replacing the slab due to an increase in traffic volume. However, as described above, since the RC slab is heavy, the lower structure of the bridge including the girder must be strengthened. However, a major change in the configuration of the entire bridge is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to make it possible to replace a floor slab during a short traffic control period and to change the lower structure of a bridge by reducing the weight of the floor slab. It is an object of the present invention to provide a method of replacing a concrete slab bridge with a steel slab, and a structure for replacing a concrete slab bridge with a steel slab, which enables widening without any change.

[0009]

According to the present invention, there is provided a method of replacing a concrete slab bridge with a steel slab according to the present invention, wherein the concrete slab is supported by a main girder extending in the bridge axis direction. In the bridge, a replacement member is provided on the main girder by replacing a steel plate member so that the main girder floor slab portion other than the joint supported portion, which is the bonding portion of the concrete slab with the main girder, can be supported from the lower surface side. After fixing through, the gap between the joined supported portion and the main girder floor slab portion is cut to remove the main girder floor slab portion supported by the replacement steel plate member, and the joint supported portion is The supported portion upper surface steel plate covering at least the upper surface is immovably fixed, the fixing of the support member to the main girder is released, and the replacement steel plate member is raised to a position matching the supported portion upper surface steel plate, The support member to the main girder The addition to degrees fixed coupling the replacement-parts and the supported portion upper surface steel plate, characterized by replacing the main beam between the slab region in the replacement-parts.

[0010] Further, the structure for replacing a concrete slab bridge with a steel slab is provided in a bridge in which the concrete slab is supported by a main girder extending in the bridge axis direction. The concrete floor slab of the main girder floor slab portion except for the bonded supported site that is the bonded site is removed, and only the bonded supported site remains on the main girder,
The supported portion upper surface steel plate is fixed to the upper surface of the joined supported portion, and a replacement steel plate member is fixed to the main girder portion and fixed to the main girder via a support member. The upper steel plate and the replacement steel plate member are combined and integrated.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1A is a cross-sectional view orthogonal to the bridge axis of the RC slab bridge before the replacement, and FIG. 1B is a cross-sectional view of the bridge after the replacement.

The bridge 1 ′ shown in FIG.
Is a reinforced concrete floor slab (RC floor slab) 2 on a girder set including three main girder 10 having a cross-sectional shape I extending in the bridge axis direction.
No. 0 is constructed and supported via a main girder 10 on piers (not shown) arranged at predetermined intervals in the bridge axis direction.

A dowel 11 is provided upright on the upper surface of the upper flange 10F of the main girder 10. The dovetail 11 is immersed in the RC slab 20 so that the main spar 10 and the RC slab 20 can transmit a shearing force. Are combined. The part supported by the main girder 10 of the RC floor slab 20 is formed to be thicker than the other parts by protruding the back surface side with an oblique haunch. Hereinafter, a haunch part is added to the upper flange 10F of the main girder 10. The portion having a width is referred to as a joined supported portion 21, and a portion having an equal thickness between the joined supported portions 21 is referred to as a main girder floor slab portion 22.

The RC slab 20 is replaced with a steel slab by using an example of the method for replacing a slab according to the present invention.
As shown in (B), a steel deck bridge 1 is used.

First, as shown in FIG. 2, which is a partial cross-sectional view, a plurality of support cross beams 31 as support members are fixed to the main girder 10 and are arranged at predetermined intervals in the bridge axis direction.

The illustrated support cross beam 31 is formed of a steel plate having a predetermined thickness and provided with a flange 31A having a predetermined width at an upper edge of a plate portion having a predetermined height. The fixed support plate 32 is fixed to the main girder 10 by being fastened to a fastening plate portion 32A of the fixed support member 32 by a bolt and a nut (not shown).
Are provided horizontally so as to be at a predetermined distance from the back surface of the.

The supporting bracket 32 is formed of a T-shaped section steel to a predetermined length, and its flange has a belly plate 1 of the main girder 10.
It is fixed in a vertical state to 0 W by, for example, welding, and is provided so as to project the fastening plate portion 32A so as to be orthogonal to the bridge axis. The fastening plate portion 32A is set to have a predetermined length in the vertical direction so as to allow movement of the support cross beam 31 described later.

Next, as shown in FIG. 4 which is a sectional view taken along the line AA in FIG. 3 and FIG. 3, and FIG. RC floor slab 20
The replacement structure 33 is inserted between the lower surface of
And the support and replacement structure 30 are integrated by welding or fastening with bolts and nuts.

The replacement structure 33 is a main girder 1 of the RC slab 20.
As shown in FIG. 6, which is a perspective view of the part on the lower surface side of the replacement steel plate 33A as a replacement steel plate member having a width corresponding to the main girder floor slab part 22 excluding the joined supported part 21 supported by 0. , T-shaped vertical beam 3 extending in the bridge axis direction
3B is formed by welding and fixing a plurality of strips. The height is set so that the upper edge of the supporting cross beam 31 fixed to the main girder 10 and the lower surface of the main girder floor slab portion 22 of the RC slab 20 can be fitted with a predetermined tolerance, The length in the bridge axis direction is set so as to be supported by the plurality of supporting cross beams 31.

Here, as shown conceptually in FIG. 7, the replacement structure 33 is installed in such a manner that the supporting cross beam 31 corresponding to the length of the replacement structure 33 is not disposed on a part of the bridge 1. A part: X is set, and at this insertion part: X, the replacement structure 33 is lifted in a horizontal state to a height corresponding to a position between the supporting cross beam 31 and the RC floor slab 20, and is shifted horizontally to a predetermined position. By doing it. The replacement steel plate 33A and the vertical beam 33B of the replacement structure 33 adjacent in the bridge axis direction are joined by welding or bolts and nuts. Thus, the vertical beam 33B becomes a strength member that is continuous in the bridge axis direction.

As described above, the support cross beam 31 and the RC slab 20
When the replacement structure 33 is disposed between the (main girder floor slab portions 22) and the support replacement structure 30 is formed, the replacement steel plate 33 is formed.
A is located close to the lower surface of the main girder floor slab portion 22, whereby the main girder floor slab portion 22 can be supported.
At this time, the fixing position of the support cross beam 31 to the main girder 10 is more positively adjusted to replace the replacement steel plate 33 of the support replacement structure 30.
A may be brought into contact with the lower surface of the main girder floor slab portion 22. In addition, for a portion where the lower surface of the main girder floor slab portion 22 is not horizontal, a replacement steel plate 33A is disposed obliquely in correspondence with the portion, or a spacer 3 having a corresponding shape as shown in FIG.
5 is interposed.

Thereafter, the bonded supported portion 2 of the RC floor slab 20
1 and the main slab section 22 are cut along a vertical plane parallel to the bridge axis. As a result, the main girder floor slab portion 22 is supported by the main girder 10 via the support replacement structure 30, and the main girder floor slab portion 22 is removed by further appropriately subdividing, etc. FIG. As shown in FIG. 7, only the joined supported portion 21 remains.

Next, as shown in FIG. 9, the remaining coupling supported portion 21 is fixed by covering with a fixing cap 40.

The fixed cap 40 is provided on the left and right sides on the lower surface of the top plate 41 as the upper surface steel plate of the supported portion, with side plates 42 of a predetermined height.
Is fixed at an interval corresponding to the width of the joint supported portion 21 and is formed of a steel plate having a predetermined thickness in a substantially U-shaped cross-sectional shape that is open to a lower side that can be fitted into the joint supported portion 21 from above. I have. The top plate 41 projects outwardly from the left and right side plates 42 by a predetermined amount to form a coupling flange 41A. The top plate 41 has a fixed cap 40, as shown in FIG. Filling holes 41B are formed at intervals, and fixed pins 4 of a predetermined length are formed on the inner surface (lower surface).
1C is planted.

The fixed supported portion 2 of the fixing cap 40
1 is fixed to the upper surface of the coupling supported portion 21 at a position corresponding to the fixing pin 41C of the fixing cap 40 by the coupling hole 21A.
After the bonding hole 21A is filled with an epoxy-based adhesive or the like, the fixing pin 41C is matched with the bonding hole 21A, and the fixing cap 40 is put on the joint supported portion 21 to fix and bond. Supported part 2 connected via port 41B
This is performed by injecting and filling mortar between the upper surface of 1 and the top plate 41 of the fixed cap 40.

Thereafter, the support cross beam 3 of the support replacement structure 30 is
1 is supported by a jack or a crane or the like, the fixing of the supporting cross beam 31 to the supporting bracket 32 (that is, fixing to the main girder 10) is released, and the replacement steel plate 33 </ b> A becomes the top plate 41 of the fixing cap 40.
To the position where it comes into contact with the support beam 31 at that position.
Is fixed to the support bracket 32 (main girder 10), and the side edge of the replacement steel plate 33A and the coupling flange 41A of the top plate 41 of the fixing cap 40 are fastened with bolts and nuts. Thus, as shown in FIG. 11, the replacement of the main girder slab portion 22 of the RC slab 20 with the replacement steel plate 33A of the support replacement structure 30 is completed.

After the replacement of the RC slab 20 with the steel slab is thus completed, the upper surface can be paved with a predetermined thickness by asphalt or the like and used.

According to the above method, the RC slab 20
Of the main girder floor slab portion 22 is replaced by the replacement steel plate 33A of the support replacement structure 30 made of a steel plate, and the top plate of the fixing cap 40 fixed to the joined supported portion 21 of the RC slab 20 remaining. Since the RC slab 20 is replaced with a steel slab by combining with the steel slab 41, the joint supported portion 21 that is coupled to the main girder 10 of the RC slab 20 that is difficult to remove is replaced with a steel slab without removing. Can be replaced in a short time. Thereby, the traffic regulation period of the bridge in use can be shortened, and the influence on traffic can be minimized.

In addition, since the main slab floor section 22 made of reinforced concrete is replaced by the supporting replacement structure 30, the total weight can be reduced, and the width of the bridge pier and the lower structure of the bridge can be increased. It is possible.

The support replacement structure 30 and the fixing cap 4
The configuration of 0 is not limited to the above configuration example, but can be changed as appropriate. For example, as shown in FIG. 12 which is a perspective view corresponding to FIG.
A plurality of section steels 33C having a substantially U-shaped cross section are fixed on the lower surface of 3A in parallel in the bridge width direction with the longitudinal direction being the bridge axis direction, and connecting members 34 are provided at positions corresponding to the support cross beams 31. May be.

[0032]

As described above, according to the method for replacing a concrete slab with a steel slab according to the present invention, the main girder excluding the joined supported part which is the joint with the main girder of the concrete slab. After the replacement steel plate member is fixed to the main girder via the support member so that the inter-slab portion can be supported from the lower surface side, the replacement steel plate member is cut by cutting between the joined supported portion and the main girder inter-slab portion. The main slab section supported by the main slab is removed, the supported part upper surface steel plate covering at least the upper surface thereof is immovably fixed to the joined supported part, and the support member is released from being fixed to the main girder to replace the steel plate. The member is raised to a position where it matches the supported part upper surface steel plate, the support member is fixed to the main girder again, and the supported part upper surface steel plate and the replacement steel plate member are joined, and the main girder floor slab portion is replaced with the replacement steel plate member. Replace. Accordingly, only the inter-girder slab portion is replaced with the replacement steel plate member without removing the joint supported portion that is connected to the main girder of the concrete slab which is difficult to remove, so that the replacement can be performed in a short time. Thereby, the traffic regulation period of the bridge in use can be shortened, and the influence on traffic can be minimized. In addition, the total weight can be reduced, and the bridge can be widened without strengthening the pier or the lower structure of the bridge.

Further, as a structure for replacing a concrete slab bridge with a steel slab, in a bridge in which the concrete slab is supported by a main girder extending in the bridge axis direction, the concrete slab is connected to the main girder of the concrete slab. The concrete slab of the main girder floor slab except for the joint supported part which is the part is removed, and only the joint supported part remains on the main girder, and the supported part upper surface steel plate is provided on the upper surface of the joint supported part. While being fixed,
The replacement steel plate member is fixedly provided on the main girder via the support member at the floor between the main girders, and the upper steel plate to be supported and the replacement steel plate member are integrated and configured to be removed. Since only the inter-girder floor slab portion is replaced with the replaced steel plate member without removing the joined supported portion that joins with the main girder of the concrete slab which is difficult to perform, the re-placing can be performed in a short time. Thereby, the traffic regulation period of the bridge in use can be shortened, and the influence on traffic can be minimized. Further, the total weight can be reduced, and the bridge can be widened without strengthening the pier or the lower structure of the bridge.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view orthogonal to the bridge axis of a bridge on an RC floor slab before replacement, and FIG. 1B is a cross-sectional view of the bridge after being replaced with a steel slab using an example of the replacement method according to the present invention. It is sectional drawing.

FIG. 2 is a partial sectional view of a bridge in a state where a supporting cross beam is fixed.

FIG. 3 is a partial cross-sectional view of a bridge in a state where a replacement structure is fixed to a supporting cross beam to construct a support replacement structure.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a view taken in the direction of the arrow B corresponding to the bottom view of FIG. 3;

FIG. 6 is a partial perspective view of a replacement structure.

FIG. 7 is a conceptual diagram illustrating a method of installing a replacement structure.

FIG. 8 is a partial cross-sectional view of the bridge in a state where a main girder floor slab portion is removed.

FIG. 9 is a partial cross-sectional view of a bridge in a state where a fixed cap is placed on a joint supported portion.

FIG. 10 is a view of the fixing cap as viewed from the back side.

FIG. 11 is a partial cross-sectional view of the bridge in a state where a main girder floor slab portion is replaced by a support replacement structure.

FIG. 12 is a perspective view of another configuration example of the replacement structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel slab bridge 1 'RC slab bridge (concrete slab bridge) 10 Main girder 20 Concrete slab 21 Joint supported part 22 Main girder slab part 30 Support replacement structure 31 Support cross beam (support member) 33 Replacement Structure 33A Replacement steel plate (replacement steel plate member) 40 Fixing cap 41 Top plate (Supported portion upper surface steel plate)

Claims (2)

[Claims] 1. A bridge comprising a concrete slab supported by a main girder extending in the bridge axis direction, wherein a gap between the main girders excluding a joined supported part which is a joint part of the concrete slab with the main girder. After the replacement steel plate member is fixed to the main girder via a supporting member so that the floor slab portion can be supported from the lower surface side, the space between the joined supported portion and the main girder floor slab portion is cut off. The main girder floor slab portion supported by the replacement steel plate member is removed, and a supported portion upper surface steel plate covering at least an upper surface thereof is immovably fixed to the joint supported portion, and the support member is attached to the main girder. Release the fixation, raise the replacement steel plate member to a position where it matches the supported portion upper surface steel plate, fix the support member again to the main girder, and join the supported portion upper surface steel plate and the replacement steel plate member. The main girder floor slab How replacement for steel deck concrete slab bridges, characterized in that substituted with a substituted-parts. 2. A bridge having a concrete floor slab supported by a main girder extending in the bridge axis direction, wherein a gap between the main girder excluding a joined supported part which is a joint part of the concrete floor slab with the main girder. The concrete slab of the slab portion is removed, and only the joined supported portion remains on the main girder, the supported portion upper surface steel plate is fixed on the upper surface of the joined supported portion, and the main girder floor is fixed. A replacement steel plate member is fixedly disposed on the main girder via a support member at the plate portion, and the supported portion upper surface steel plate and the replacement steel plate member are integrally combined. Replacing concrete slab bridges with steel slabs.