JPH07247702A - Pullback construction method for removal and disassembly of bridge - Google Patents

Abstract

PURPOSE:To remove an urban viaduct as one body. CONSTITUTION:A bridge 1 on existing piers 2 is lifted and separated from the existing piers 2 through lifting and horizontally moving devices 3. The bridge 1 having been lifted and separated from the piers 2 is moved onto an adjoining bridge 4 through the devices 3. The bridge 1 having been moved onto the bridge 4 is then disassembled by means of a disassembling device 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pullback method for removing or dismantling a bridge such as an urban viaduct.

[0002]

2. Description of the Related Art Conventionally, it has been known to remove bridges all at once by using a floating crane or the like on rivers, but in the case of urban viaducts, for example, on existing legs 2 as shown in FIG. Bridge 1 is the bridge 1 before dismantling due to work safety
A support member 12 such as a vent is newly provided in the middle of the existing leg 2 for supporting the
Install a plurality of, then remove the joints 11 etc. of the bridge 1,
The bridge 1 was divided into multiple pieces and dismantled and removed by the dismantling equipment facility 6.

[0003]

However, in the conventional method of removing an urban viaduct, in the case of a concrete slab bridge, first, the concrete is removed by scraping, and the space under the bridge is provided with a means for protecting fallen objects such as suspended dust. However, it is difficult to completely protect fallen objects such as dust and dust, and there is a problem that the construction period will be delayed and the ground surface will be adversely affected due to traffic restrictions and pollution measures under the bridge. was there.

The present invention was developed to address such problems, and it is an object of the present invention to pull back a bridge integrally with a reinforced concrete floor slab and enable dismantling on an existing bridge.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. In the present invention, the bridge 1 on an existing leg 2 is lifted and horizontally moved. The first step of lifting and separating on the existing leg 2 via the device 3 and the bridge separated and lifted on the existing leg 2 to the adjacent bridge 1 or road via the lifting and horizontal moving device 3. It is characterized by comprising a second step of moving and a third step of dismantling the adjacent bridge 1 or the bridge 1 moved on the road at the moving place via the dismantling equipment facility 6.

[0006]

According to the present invention, the bridge on the existing leg is lifted up on the existing leg integrally with the reinforced concrete floor slab by the above means, then moved to the adjacent bridge or road, and dismantled on the road surface. Therefore, dismantling equipment is not required for the space under the bridge, and environmental safety measures are minimized to shorten the construction period, enabling continuous removal work.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1. As shown in FIG. 1 (a), a lifting / horizontal moving device 3 including a jack or the like is mounted on an existing leg 2 for supporting a bridge 1. The bridge 1 is installed on the existing leg 2 by the lifting / horizontal moving device 3 as shown in FIG. 1 (b), and then on the lifting / horizontal moving device 3 and the adjacent bridge 4. The bridge 1 lifted through the provided glide slide device 5 is moved to the adjacent bridge 4 as shown in FIG. At this time, when a new bridge 1a is connected to the rear end of the elevated bridge 1, a new bridge 1a can be installed simultaneously with the removal of the bridge 1. And the bridge 1 moved to the adjacent bridge 4 is shown in FIG.
As shown in (d), it is dismantled on the adjacent bridge 4 through the dismantling equipment 6 such as a weight dismantling machine.

When the cantilever overhanging portion of the removed bridge 1 is large when the removed bridge 1 is moved to the adjacent bridge 4 in the above process, the supporting cable 7 is provided on the adjacent bridge 4 as shown in FIG. The tip lifting device 8 is attached, or as shown in FIG. 3, the hand stretcher device 9 is attached to the rear end of the removed bridge 1. In the case of a curved girder as shown in Fig. 4, the existing leg 2
The bridge axis vertical direction movement control device 10 is installed in the.

Although the illustrated one shows the case where the removed bridge is moved to the adjacent bridge, it is needless to say that the bridge is moved to the road immediately when there is no adjacent bridge.

[0010]

As described above, according to the present invention, the bridge supported on the existing leg is lifted on the existing bridge, and the bridge is moved to the adjacent bridge to be dismantled on the adjacent bridge. It is safe because no falling objects fall into the space under the bridge when dismantled, and there is no need to install dismantling equipment in the space under the bridge, so work can be done in a short period of time without the need to block traffic. If the bridge is continuous, dismantling and removal work can be carried out continuously.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is an explanatory view showing an installation state of a lifting and horizontal moving device, (b) is an explanatory view showing a lifting state of a bridge (c) is a bridge And (d) are explanatory views showing a dismantled state of the bridge.

FIG. 2 is an explanatory diagram showing another moving state of the bridge.

FIG. 3 is an explanatory diagram showing still another movement state of the bridge.

FIG. 4 is a schematic view of a curved bridge.

FIG. 5 is a schematic view showing a conventional example.

[Explanation of symbols]

 1 Bridge 2 Existing leg 3 Lifting and horizontal moving device 4 Adjacent bridge 6 Dismantling equipment facility

Claims (1)

[Claims] 1. A first step of lifting and separating a bridge on an existing leg onto an existing leg via a lifting and horizontal moving device, and a bridge separated and lifted on the existing leg. From the second step of moving onto the adjacent bridge or adjacent road via the moving device, and the third step of dismantling the adjacent bridge or bridge moved onto the road at the moving place through the dismantling equipment. This is a pullback method when removing or dismantling a bridge.