JPS6255305A - Method for withdrawing reinforced concrete floor panel of bridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing reinforced concrete deck slabs for bridges.

[Prior art]

The main girders of bridges often have an I-beam cross-section, and the horizontal flanges that make up the main girders support the reinforced concrete slab.

By the way, if the reinforced concrete deck of a bridge with this structure becomes dangerous due to cracks, etc.,
This reinforced concrete slab needs to be replaced.

Conventionally, in this case, the reinforced concrete slab was removed using air gouging or core breakers, leaving the main girders and flanges that make up the support members of the bridge, but this construction method was very noisy and caused the bridge to become inhabited. Because they are often installed near the ground, they not only cause noise pollution, but also require a great deal of time and effort to remove them.

In order to solve the problem of the above construction method, as shown in Fig. 6, on the flange 2 provided horizontally on the main girder 1, when the reinforced concrete deck slab 3 is cut, it is supported by the main girder. It has been proposed to cut vertically inside the flange 2 and lift and scatter the cut reinforced concrete slab 3 using a crane or the like.

However, in this method, it takes time to lift the cut reinforced concrete slab 3. In other words, the thickness W of this reinforced concrete slab 3 is generally about 30 μ, and the intervals between cutting lines 4 made by a diamond cutter etc. are 30 mm.
Approximately 0 fins. Therefore, unless the cut reinforced concrete floor slab 3 is lifted gently along the cutting line 4, it will come into contact with the reinforced concrete floor slab 3' left on the flange 2 and cannot be lifted. In addition, since the cutter is cut on the flange 2, there is a risk that the cutter will come into contact with the flange and cause damage to the flange.

[Purpose of the invention]

The present invention has been made in order to solve the conventional problems as described above, and its purpose is to provide a method for constructing bridge reinforced concrete deck slabs that causes less noise pollution (and has good workability). We aim to provide the following.

[Summary of the invention]

To achieve the above object, the present invention provides a bridge in which a reinforced concrete deck is supported by a flange of a main girder, in which a cutting line of the reinforced concrete deck is inclined outward in the width direction of the flange from the top to the bottom. This method involves cutting reinforced concrete deck slabs into bridges, then lifting and scattering the cut reinforced concrete deck slabs.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for removing reinforced concrete slabs for bridges according to the present invention will be described below with reference to FIGS. 1 to 5.

Figure 1 shows a bridge 10 during which reinforced concrete slabs 11 are being removed.
FIG. 2 is a partial plan view, and FIG. 3 is a partial sectional view.

The bridge 10 has a flange 1 having a dowel 13 on the main girder 12.
4 is formed in the horizontal direction, and a reinforced concrete floor slab 11 and a paving layer 5 are laminated on this flange 14.

In the present invention, the method of cutting the concrete slab near the flange 14 is significantly different from conventional construction methods.

That is, the reinforced concrete floor slab 11 having the above structure is cut with a cutter along the flange 14 so that the cutting line 16 thereof is inclined from the top to the bottom at an angle θ to the outside of the flange 14, as shown in FIG. disconnected.

The thus cut reinforced concrete floor slab 11 is longitudinally cut along cutting lines 18 to form blocks 22 that match the lifting capacity of the crane 17 as shown in FIG. This cutting line 18 may be vertical. Thereafter, a lifting device 19 is attached to the reinforced concrete floor slab 11 and lifted by a crane 17, loaded onto a truck 20, and transported as appropriate.

As described above, in the vicinity of the flange 14, the flange 14
Cut the concrete slab from the top surface to the bottom surface with a cutter so that it faces outside of the reinforced concrete slab 1.
1, some of it remains on the flange 14 as shown in FIG. This involves injecting an inflatable material, statically crushing it, and then scattering it.

Further, in some cases, a normal concrete crushing method may be used in combination, but even in this case, since the concrete slab 11' is a small amount, it is possible to prevent generation of large noises as in the conventional method.

FIG. 5 is an explanatory diagram of the case where the reinforced concrete deck slab 11 of a box girder bridge is removed, and this is done in the same manner as in the first embodiment.

〔Effect of the invention〕

As is clear from the above explanation, in the method of scattering the bridge reinforced concrete deck 11 according to the present invention, concrete is poured diagonally outward from above the flange 14 in the vicinity of the flange 14 provided at the upper end of the main girder 12. The feature is that the floor slab 11 is cut.

Therefore, according to the present invention, there is less noise pollution, and since the cutting line 16 along the flange 14 is inclined outward from the flange 14 from the top to the bottom, the concrete slab 11 remains unchanged even after cutting. It is now supported by the concrete slab 11' on the flange 14.

Moreover, since the cutting line 16 is oblique, the work when lifting the concrete slab 11 upward with a crane is easy.

Furthermore, during the cutting work of the concrete slab 11, the cutter does not come into contact with the flange 14 and damage it as in the conventional construction method (this has the effect of making it possible to remove the flange with good workability). .

[Brief explanation of drawings]

1 to 5 are explanatory diagrams of an embodiment of the bridge reinforced concrete deck scattering method according to the present invention, in which FIG. 1 is a partial perspective view of the bridge, FIG. 2 is a plan view, and FIG. The figure is a sectional view, FIG. 4 is an explanatory diagram of the removal of the reinforced concrete slab on the flange 14, and FIG. 5 is an explanatory diagram of an example of application to a bridge of another structure. FIG. 6 is an explanatory diagram of the conventional method for removing reinforced concrete slabs for bridges. 1.12...Main girder, 2,14...Flange, 3.1
1...Reinforced concrete floor slab, 4.16.18...
Cutting line, 10...Bridge, 13...Gibel, 15...
- Asphalt, 17... Crane, 19... Hanging tool, 20... Trunk, 21... Injection hole.

Claims (1)

[Claims] In a bridge in which a reinforced concrete deck is supported by a flange provided on a main girder, the reinforced concrete deck is cut so that the cutting line is inclined outward in the width direction of the flange from the top to the bottom; A method for removing reinforced concrete deck slabs for bridges, which is characterized by lifting up and removing the reinforced concrete deck slabs.