JPS626058A - How to construct a work vehicle for repairing bridges, etc. - 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 repair work vehicle for long bridges, suspended bridges, etc., which is mainly suspended from the underside of bridge girders for inspection, maintenance work, and painting work. This relates to the construction method.

[Prior Art] As bridges have recently become larger and longer, as is known from the Honshu-Shikoku Connecting Bridge, the amount of work and dangerous work involved has increased, so painting work on large, movable (mobile ) It has become necessary to use work vehicles more safely and in a shorter time.

However, conventional underside work vehicles for bridges are limited to small hanging inspection vehicles, and these vehicles are no longer able to handle larger and longer bridges.

[Problems to be solved by the invention] In other words, since conventional work vehicles are small, they can be hung from the top of a bridge to the underside of a bridge girder using a crane, etc., but large work vehicles cannot be mounted in this way. method cannot be adopted.

On the other hand, it is conceivable to erect a large construction vehicle by constructing scaffolding from the seabed or under water below the bridge, but since the lower surface of the bridge girder is located at an extremely high place, it would require a huge amount of cost and construction time, and it would also be difficult for ships to navigate. There were many difficulties and shortcomings in safety measures during typhoons, etc., and it was impossible to realize.

The present invention aims to eliminate such difficulties and drawbacks and to provide a method for constructing a repair work vehicle that can be easily constructed from above the fa beam.

[Means for Solving the Problems] The construction method of the present invention suspends and supports a work vehicle component unit with a left-right split structure equipped with a foldable main girder member at the width end of a bridge girder portion of a bridge, etc. The main girder members of both units are extended and connected at the lower surface of the bridge girder portion, and a floor plate is further disposed on the main girder member.

[Function] Therefore, the work vehicle can be erected safely in a short time without erecting a large-scale scaffold from the seabed or under water.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 shows an example of a two-tiered bridge, with the upper tier serving as an automobile road and the lower tier serving as a railway. 2 is the lower bridge girder of the beam 1, and in the present invention,
A work vehicle is installed so as to be suspended from both width ends of the bridge girder 2.

As shown in FIG. 2, the working vehicle is composed of a pair of left and right working vehicle constituent units 3L and 3R. Units 3L, 3Rt, l: @Have running sections 5 arranged at required intervals so as to run on guide rails 4 laid in the longitudinal direction (bridge axis direction) on the width end of the girder 2. The running section 5 has a running frame 6 which is inverted when viewed from the front (Fig. 1).
It is installed inside the upper part of the. Further, a main girder material holding casing 7 is fixedly installed at the lower part of the traveling frame 6, and at the front and rear positions within the holding casing 7, a main girder material 8 that can be folded horizontally into two stages can be extended and stored. installed on. The length of the main girder member 8 is such that it is located at the center of the lower surface of the bridge girder 2 when expanded. In FIG. 1, reference numeral 9 denotes a temporary fixing tool 11 for temporarily fixing the traveling frame 6 to the vertical member 10 of the m-beam 1 when the units 31 and 3R are suspended from the bridge girder 2.
is a stopper that regulates the position of the traveling frame 6 during construction.

Next, the concrete construction procedure will be explained.

First, on the bridge 1, a unit, for example, 3, in which the main girder material 8 is stored in the holding casing 7, is lifted by a crane (indicated by crane wire 12 in the figure), and the bridge girder 2 is lifted.
The traveling part 5 is set so as to ride on the guide rail 4 at the width end, and the position of the unit 3 is fixed with a temporary fixing tool 9.

Next, the stored front and rear main girder members 8 are each extended to the center position of the lower surface of the bridge girder 2. The main girder material 8 can be extended by pulling it out using a hoist movably installed on the bridge girder 2, pulling it in by installing a winch on the unit on the opposite side, or pushing it out using a hydraulic cylinder. Can be adopted.

On the other hand, the unit 3R on the opposite side also performs the same process to make the main girder material 8 in an extended state.

In this way, the main girder 8.8 of both units 31.3R
After abutting at the center of the lower surface of the bridge girder 2, they are connected as appropriate, and a connecting beam 13 is installed between the front and rear main girder members 8, 8, and a floor plate 14 is arranged to form a work space. By removing the temporary fasteners 9 and the stoppers 11, the working vehicle can move along the guide rails 4, 4.

FIG. 3 shows another embodiment of the units 3L and 3R, in which the main girder 8 is articulated and extends and retracts in a bellows style. Unit 3L with such a configuration, 31? Even if you use

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the present invention, it is possible to safely erect large and long bridges, etc. in a short time without having to construct large-scale scaffolding from the seabed or the bottom of the water. It can produce excellent effects.

[Brief explanation of drawings]

Fig. 1 is a front view showing a state in which a work vehicle is being erected by the erection method of the present invention, Fig. 2 is a view taken along the ■-■ arrow in Fig. 1, and Fig. 3 is another example of a work vehicle configuration unit. FIG. 1 is a bridge, 2 is a bridge girder, 3L and 3R are working vehicle constituent units, 5 is a running section, 6 is a running frame, 7 is a holding casing, 8 is a main girder material, and 14 is a floor plate.

Claims (1)

[Claims] 1) A work vehicle component unit with a left-right split structure equipped with a foldable main girder material is suspended and supported at the width end of a bridge girder section of a bridge, etc., and the main girder materials of both units are expanded to form a bridge girder section. A method for constructing a work vehicle for repairing bridges, etc., characterized by connecting the lower surfaces of the bridges and further arranging floor plates on the main girder members.