JPH0213081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a track girder construction method, particularly to a track girder construction method suitable for constructing a track girder for a suspended monorail on an existing road.

(Prior art) Conventionally, in order to erect this type of track girder, as shown in FIG. The track girder blocks 02 were sequentially lifted onto the support 01 by a self-propelled truck crane 03 and assembled on the support 01 to construct the track.

(Problems to be Solved by the Invention) In the case of using the above-mentioned conventional erection method, the work is diverse and complicated, requiring a large number of workers, which not only increases the construction cost and construction period, but also the assembly and dismantling of the shoring 01. During the lifting and assembly of the track girder block 02, the support 01 collapsed, the truck crane 03 fell, and the track girder block 02 or its fixing fittings and tools fell, causing damage to vehicles or pedestrians passing on the existing road 05. This poses a risk of injury and requires dangerous work at heights. Furthermore, lifting the track girder block 02 requires a large truck crane 03 weighing between 75 and 125 tons, which generates large amounts of noise and vibration, and also requires a work area width of about 13 meters, so the width of the road 05 is not sufficient. This method cannot be used if there is not enough space or there is a lot of traffic.

(Means for solving the problem) The present invention was invented to solve the above problem, and its gist is that a lifting device is installed at the top of a plurality of connected existing columns, and The track girder construction method is characterized in that the track girders assembled on the ground are lifted all at once by the lifting device and then fixed to the existing supports.

(Example) The present invention will be specifically described below with reference to FIGS. 1 to 6.

Multiple existing supports 1 connected as shown in Figure 1
The lifting device 2 is hoisted up by a truck crane 3 and installed and fixed on the top of the. The number of lifting devices 2 is four if the track girder is to be lifted all at once and the track girder to be constructed is, for example, a three-span continuous girder. Then, as shown in Fig. 2, a plurality of track girder blocks 4 are carried into the construction area (approximately 10 m in width) under the girders using a trailer 5, and as shown in Fig. 3, they are connected using a truck crane 6 above the ground. The three-span continuous track girder 8 (total length approximately 80 m) will be assembled in advance. After checking the camber etc. of this track girder 8, as shown in FIGS. 4 and 5, the hanging fittings 9 are lowered from each lifting device 2 to support each fulcrum part of the track girder 8, and the defective fulcrum is At the same time, the parts are lifted vertically to a specified height (approximately 13 meters). Next, as shown in FIG. 6, the movable cart built into the lifting device 2 is used to vertically move the bridge horizontally along the axis of the bridge, and install it on the shoes provided on the beams of the support columns 1. Once the installation is complete, each lifting device 2 is attached to the support column 1.
Then, the track girder is sequentially attached to the top of the existing support 1 on which the track girder is to be erected, and the above operations are repeated thereafter.

(Operations and Effects of the Invention) Since the present invention uses existing supports, there is no need to assemble or disassemble the support.In addition, multiple track blocks can be connected in advance on the ground without lifting each track block individually. Since it is lifted afterward, the work is simple, fewer workers are required, and the construction period and cost can be reduced. Since the track girders are connected and assembled on the ground, it is easy to manage and adjust the camber, and at the same time, the assembly work can be performed easily and quickly, and dangerous work at high places can be greatly reduced. And 75 as before
Since a large truck crane of about 125 tons or so is not required and assembly can be performed using a relatively small truck crane of about 45 tons, noise and vibration are reduced and the width of the construction area is also reduced. Furthermore, since the track girder is lifted by a lifting device, it is very quiet and there is no risk of generating noise or vibration. In this way, the track girder can be erected even when there is not enough road width, when there is a lot of traffic, or on city streets.

[Brief explanation of drawings]

FIGS. 1 to 6 are external views showing different steps of the present invention, and FIG. 7 is an external view showing a conventional construction method. Existing support...1, Lifting device...2, Track girder...
8.

Claims (1)

[Claims] 1. A lifting device is installed at the top of a plurality of connected existing columns, and the track girders assembled in advance on the ground are lifted all at once by the lifting device, and then fixed to the existing columns. Track girder construction method.