JPH0235095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for installing a box culvert in a narrow mine.

[Conventional technology]

Conventionally, box culverts have been laid one by one using rollers, etc., mainly by hand, because heavy lifting equipment such as cranes cannot be used in narrow tunnels such as subway construction, communal tunnel construction, and construction under bridges. They were installed sequentially from the back of the pit to the front.

[Problem to be solved by the invention]

For this reason, this work had to be done in a narrow tunnel, requiring considerable labor and time for installation.

The problem to be solved by the present invention is to find a method for easily and reliably installing box culverts in a continuous manner in such a narrow tunnel without requiring any manual labor.

[Means to solve the problem]

In the present invention, a concrete roadbed having a flat convex surface with depressions formed on both shoulders is poured into a mine shaft to form a place for placing a box culvert having a square cross section, and the depressions on both shoulders of the roadbed are Rails are laid within the recesses of both shoulders of the roadbed, each of which has hydraulic jacks at the front and rear, and a vertically elongated truck supported by front and rear wheels is placed. Raise the jacks on the upper truck to straddle the roadbed and place and support the box culvert on both of the trucks, move the truck to transport the box culvert to the installation location, and place the box culvert at the installation location. The above problem is solved by lowering the hydraulic jacks on both trucks to sequentially install the transported box culverts on the surface of the flat convex portion of the concrete roadbed.

Furthermore, by arranging a plurality of the above-mentioned carts on the rails in the recesses of both shoulders of the concrete roadbed, it becomes possible to install a plurality of box culverts in succession.

〔Example〕

Next, the present invention will be explained by way of example with reference to the drawings.

FIG. 1 shows a concrete subgrade 1 according to the present invention, which has a flat convex cross-section, the surface of the flat convex portion serving as the installation surface of a box culvert, and which is cast in a mine shaft. FIG. 2 shows a state in which the box culvert 5 is supported by a hydraulic jack 4 provided on the truck 3 of the rail 2.

Referring to FIG. 1, depressions are provided on both shoulders of the concrete roadbed 1, and as shown in FIG. Lay rail 2. As shown in Fig. 3d, the trolley 3 has an elongated shape that is supported by front and rear wheels so that it can move within the recessed part, and a chain attached between the motor and the wheels by a gear mode motor. This allows a self-propelled structure that runs on the rails 2 in the recesses. Further, as shown in FIG. 2, the bogie 3 has a height lower than the surface of the flat convex portion of the concrete roadbed 1, and a width somewhat smaller than the width of the shoulder depression of the roadbed 1. . Further, a hydraulic jack 4 is fixed to the truck 3 for supporting and raising and lowering the box culvert by operating a hydraulic pump.

Hereinafter, the installation process will be explained based on FIGS. 3a to 3e.

First, as shown in FIG. 3a, a box culvert 5 is placed by a crane or the like on a concrete roadbed 1 which has been cast to extend outside the tunnel and has a flat convex cross section. Next, move the hydraulic jack 4 to the trolley 3.
The box culvert 3 is moved under the box culvert 5 by moving it on the rails 2 in the recesses of both shoulders, as shown in FIG. 3b. Furthermore, at this position, as shown in Figure 3c,
A jack 4 in the truck 3 is driven to lift the box culvert 5 away from the flat convex surface of the concrete roadbed 1 and support it in a straddling state. FIG. 3d is a side view of the supported state.

In this state, the cart 3 supporting the box culvert 5 is moved on the rails 2 to the installation position.

At the installation position, the jack 4 is driven again to descend and is placed on the convex surface of the concrete roadbed 1 previously provided to the installation position in the mine shaft.

FIG. 3e shows a state in which a new box culvert 5 is placed adjacent to the rear end of a plurality of box culverts 5 that have already been installed.

In this way, the box culverts 5 can be continuously and reliably installed on the concrete roadbed 1 without requiring any human effort.

〔Effect of the invention〕

According to the present invention, box culverts can be installed continuously, efficiently, and reliably without requiring special space and equipment in the tunnel and without relying on human labor.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a concrete roadbed according to the present invention, and FIG. 2 is a front view showing the relationship among the concrete roadbed, box culvert, and self-propelled truck. Figures 3a to 3e are explanatory diagrams showing the working steps of the present invention. 1... Concrete roadbed, 2... Rail, 3...
...Self-propelled trolley, 4...Hydraulic jack, 5...Box culvert.

Claims (1)

[Scope of Claims] 1. A concrete roadbed having a flat convex surface with depressions formed on both shoulders is cast in a mine shaft to form a place for placing a box culvert with a square cross section, Rails are laid in the recesses of the shoulders, and hydraulic jacks are installed at the front and rear of each rail.
In addition, a vertically elongated bogie supported by front and rear wheels is arranged, and the bogie is straddled over the roadbed with the jacks on the bogie on rails laid respectively in both shoulder depressions of the roadbed raised. A box culvert is placed and supported on top of the cart, the box culvert is moved to the installation location, and the hydraulic jacks on both carts are lowered at the same installation location, whereby the transported box culvert is placed in the concrete. A method for installing box culverts, which is characterized by sequentially installing box culverts on the surface of flat convex portions of a roadbed.