JPS6131501A - Construction of track beam - 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 track girder construction method, and particularly to a track girder construction method suitable for constructing a track girder of a suspended type mole rail on an existing road under pressure.

(Prior Art) Conventionally, in order to erect this type of track girder, as shown in Fig. 7, in addition to the supports (04), a large number of supports (01) are installed at predetermined intervals within the existing road (05). This shoring (
A self-propelled truck crane (03) lifts the track girder blocks (02) one by one onto the shoring (01).
It was constructed by assembling on top.

(Problems to be Solved by the Invention) In the case of using the above-mentioned conventional erection method, the work is diverse and complicated, and requires a large number of workers, which not only increases the construction cost and construction period, but also increases the construction cost and construction period. , demolition and track girder block (0
2) Support during lifting and assembly (01)
The collapse of the truck crane (03), the fall of the track girder block (02) or its fixing fittings, and falling tools may cause harm to vehicles or pedestrians traveling on the existing road (05), and it is dangerous. Requires high-altitude work.

Furthermore, lifting the track girder block (02) requires a large truck crane (03) of 75 to 125 tons, which generates large amounts of noise and vibration, and requires a work area of about 13 meters, so it is difficult to lift the track girder block (02). 05) When there is not enough width or there is a lot of traffic, the second construction method can be adopted~1゜(Means for solving the problem) The present invention was invented to deal with the above problem. The gist of this is that a lifting device is installed at the top of a plurality of connected existing supports, and the track girder assembled in advance on the ground is lifted all at once by the lifting device, and then the above-mentioned This is a track girder construction method that is characterized by fixing to existing supports.

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

As shown in FIG. 1, a lifting device (2) is lifted and fixed onto the top of a plurality of connected existing columns (1) using a truck crane (3). 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 Figure 2, multiple track girder blocks (4) are installed in the construction area under the girders (width approx.
0m) using a trailer (5), and as shown in Figure 3, connect it using a truck crane (6) and transport it on the ground.
Assemble in advance into a continuous span track girder (8) (total length approximately 80 m). After checking the camber etc. of this track girder (8), as shown in Figures 4 and 5, the hanging fittings (9) are lowered from each lifting device (2) and each of the track girders (8) is (Support the fulcrum part and raise each fulcrum part at the same time to a specified height of approximately 13 meters)
Lift vertically until Next, as shown in Figure 6, using the moving cart built into the lifting device (2), it is moved horizontally and vertically along the bridge axis direction and installed on the shoe provided on the beam of the support column (1). . When the installation is completed, each lifting device (2) is removed from the support (1), and then the top pressure of the existing support (1) on which the track girder is to be erected is sequentially attached, 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, and it is also possible to connect multiple track blocks 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, as before, 75 to 125
Since a large truck crane of approximately 45 tons is not required and assembly can be performed using a relatively small truck crane of approximately 45 tons, noise and vibration are reduced, and the amount of space in 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, it is possible to construct track girders even when there is no room for overlapping roads, when there is a lot of traffic, or on city streets.

[Brief explanation of the drawing]

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 column...(1) Lifting device...(2)
) Orbit girder... (8) Sub-agents Patent attorney Shigefumi Okamoto and 3 others

Claims (1)

[Claims] 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.