JPS63201204A - Method for withdrawal of construction working vehicle in oblique tensioned 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 [Industrial Application Field] The present invention relates to a method for removing an erection vehicle for extending a bridge girder in a cable-stayed bridge by sequentially moving formwork in the length direction of the bridge girder.

[Prior art]

When constructing a cable-stayed bridge, first the bridge tower is erected, and the construction work vehicle is launched from the bridge tower. The construction vehicle has a formwork, and as the construction vehicle advances, the formwork is moved to sequentially construct and extend the bridge girders. The bridge girders are supported by diagonal members strung from the bridge towers to the left and right in the middle direction.

[Problems to be solved by this invention]

Normally, construction vehicles like this are dismantled when they reach the end of the bridge girder on land, but as shown in Fig. Dismantling the construction vehicles that have been constructed is a difficult and dangerous task. In other words, the intermediate position in the longitudinal direction of the bridge girder is located on land, so it is not safe to dismantle the construction vehicle, and if there are houses, roads, etc. directly below, a major accident could occur if parts of the construction vehicle were to fall. be.

In order to avoid such difficulties and dangers, it is conceivable to move the construction work vehicle back to the bridge girder before dismantling it, but since the bridge girder is already suspended by the diagonal members, this diagonal material may become an obstacle. There is a problem in that the construction work vehicle cannot be backed up.

[Means for solving problems]

The method for disassembling and removing an erection vehicle for a cable-stayed bridge according to the present invention is to separate the cross beams and retreat the erection vehicle to the bridge, avoiding the diagonal members.

The construction vehicle has a cross beam supported so as to be able to run on rails laid on the top surface of the bridge girder, and a work platform suspended from both ends of the cross beam to the bridge girder construction method.

Detachable connecting parts are provided at the left and right ends corresponding to the diagonal members of the cross beam. Remove this connection and separate the center of the cross beam, the cross beam part, and both ends of the cross beam.

The central part of the cross beam runs on the rails on the bridge girder and retreats.

Both ends of the cross beam are supported by legs extending above the bridge girder, allowing the legs to run on rails laid at both ends in the middle direction of the bridge girder. It runs on this rail and retreats both ends of the crossbeam along with the work platform to the bridge tower.

〔Example〕

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

In the figure, A is an erection work vehicle, and a plurality of rails 2 are laid continuously in the length direction on the upper surface of a bridge girder 1. An erection work vehicle A can run on this rail 2 via wheels 3. Two cross beams 4.4 are supported on the top of the construction vehicle A in parallel to the width direction of the bridge girder 1.
Lower beams 5,5 are suspended from the lower beams 5.5, and the formwork 6 is supported by these lower beams 5.5.

Hanging members 7.7 are suspended from both ends of the cross beams 4, 4,
A workbench 8 is suspended from this hanging member 7.7.

At both ends of the cross beams 4, 4, detachable coupling parts 10, 10 corresponding to the diagonals 9, 9 are provided. In the example, the third
As shown in the figure, fixing plates 11.11 are attached facing each other, and a piece 20 is removably interposed between the fixing plates 11.11.

This fixed plate 11.11 is connected to the PC steel rod 12 passing through the piece 20.

To back up the construction vehicle A as described above, first move the bridge girder 1.
Rails 13°13 are laid at both left and right ends in the middle direction. Legs 15.15 are attached downward from both ends of the cross beam 4.4, and wheels 16.16 at the lower end of the legs 15.15 enable it to run on the rails 13.13.

In this state, the PC steel bar 12 is removed and the piece 20 is removed, and the center portion and both ends of the cross beam 4.4 are separated. Cross beam 4
, 4 retreats along the rail 2 to the bridge tower 17 after removing the formwork 6. Both ends of the cross beam 4.4 are retreated together with the work platform 8 along the rail 13.13 to the bridge tower 17.

As described above, the construction vehicle A separates the connecting parts 10.10 at both ends of the cross beam 4.4 corresponding to the diagonal members 9.9, and uses the space created by removing the piece 20 to allow the diagonal members 9, 9 to move when reversing. It will not be a hindrance.

This invention has the above-mentioned configuration, but as shown in FIG. Legs 15.15 may be attached to 18.18. The legs 15.15 are run on the rails 13.13, causing both ends of the cross beams 4, 4 to retreat.

〔Effect of the invention〕

This invention has the above-mentioned configuration, and in order to separate the connecting parts corresponding to the diagonal members at both ends of the cross beam and retreat the central part of the cross beam and both ends of the cross beam separately while avoiding the diagonal members, the construction work vehicle can be easily retreated and safely dismantled at the bridge tower.

[Brief explanation of the drawing]

Figure 1 is a front view of the cable-stayed bridge in its construction state, and Figure 2 is a sectional view of the construction work vehicle. A cross-sectional view taken along the line nb-nb, FIG. 3 is a side view of the connecting portion, and a cross-sectional view of the first embodiment. A...Erection work vehicle, 1...Bridge girder, 2...Rail, 3...
Wheels 1.4...Horizontal beam, 5...Lower beam, 6...Formwork, 7...
Hanging material, 8...Workbench, 9...Diagonal material, 10...Connection part,
11... Fixed plate, 12... PC steel bar, 13... Rail,
15... Legs, 16... Wheels, 17... Bridge tower, 18...
Overhang material, 20 pieces.

Claims (1)

[Claims] In an erection work vehicle that sequentially extends the bridge girder by moving the formwork in the length direction of the bridge girder of a cable-stayed bridge, the construction work vehicle has a cross beam supported so as to be able to run on a rail laid on the top surface of the bridge girder, It has a work platform suspended below the bridge girder from both ends of the cross beam, and detachable connecting parts are provided at both ends corresponding to the diagonal members of the cross beam, and by removing these connecting parts, the central part of the cross beam and both ends of the cross beam can be connected. The central part of the cross beam is moved backward by running on the rails on the bridge girder, and both ends of the cross beam are supported by legs that extend over the bridge girder, and can run on rails laid at both ends in the width direction of the bridge girder. A method for removing an erection work vehicle from a cable-stayed bridge, characterized by retreating both ends of the cross beam together with the work platform to the bridge tower.