JPH07882B2 - Construction method of temporary roadbed for moving heavy objects - Google Patents

Description

The present invention relates to a method for constructing a temporary roadbed that bears the load of heavy objects.

"Prior Art" When moving a heavy structure, the ground of a moving route is temporarily improved so as to bear the load of the heavy structure.

Conventionally, as one example of this type of ground improvement means, there is known a method of driving a pile to an underground support ground and placing concrete on the surface of the ground to build a concrete roadbed supported by the pile to improve the ground. ing.

The concrete roadbed constructed as described above is restored by removing the concrete portion after moving the heavy structure, and the removed material is disposed of as industrial waste.

[Problems to be Solved by the Invention] However, the above-mentioned conventional construction method has a problem that a pile driving operation and a concrete placing operation are required, which requires large-scale equipment and a large amount of materials. In addition to that, in the above-mentioned conventional method, it is necessary to perform large-scale concrete removal work for restoration after moving heavy structures, and after removing the materials, a large amount of industrial waste must be paid. It was necessary to dispose of it, and the method was extremely expensive.

The present invention has been made in view of the above-mentioned problems, and it is possible to build a roadbed having sufficient proof stress without producing industrial waste, and special work and many materials are not required for restoration, and the construction cost is increased. The purpose of the present invention is to provide a method for constructing a temporary roadbed for moving a cheap heavy structure.

“Means for Solving Problems” The present invention, in order to solve the problems, freezes the ground of a route for moving a heavy load to temporarily improve the yield strength,
This is a temporary roadbed.

[Operation] The roadbed can be constructed by freezing without using special materials such as piles and concrete, and can be quickly restored without thawing industrial waste by thawing after use.

"Embodiment" FIGS. 1 and 2 are for explaining one embodiment of the present invention. When the heavy load 1 is moved, the ground G on the moving route is shown.
A plurality of the freezing pipes 2 are driven to the required depth to cool the ground G to form the frozen soil layer 3. Here, the freezing tube 2 is a well-known one which has a cooling function by circulating a refrigerant therein. Then, when the frozen soil layer 3 is formed, the thickness of the frozen soil layer 3 and the freezing temperature are appropriately set according to the weight of the heavy object 1 to be moved on the frozen soil layer 3. That is, heavy object 1
The heavier the weight, the thicker the frozen soil layer 3 and the lower the freezing temperature. In setting the freezing temperature, when setting the temperature of the frozen soil layer 3 to about -10 to -20 ° C, use a freezing tube using brine such as chlorine gas, and when freezing to a lower temperature. For this purpose, a cooling liquid such as liquid nitrogen may be used for cooling.

Next, when the frozen soil layer 3 is formed, the receiving plate 4 made of a steel plate or the like is laid on the upper surface of the frozen soil layer 3, and the heavy object 1 loaded on the conveyor device 5 such as a roller is moved on the receiving plate 4. During this movement, the frozen soil layer 3 supports the heavy load 1 and the load of the transport device 5. Since it is known that frozen soil has a strength comparable to that of concrete, it can sufficiently support the load of the heavy load 1. Further, since the ground G as it is can be used as a temporary roadbed, it is not necessary to throw in special materials such as piles and concrete.

On the other hand, after the heavy load 1 is moved, the frozen soil layer 3 is thawed and the frozen soil layer 3 disappears to complete the restoration work of the ground G. In this restoration work, concrete removal work is unnecessary, and since industrial waste is not generated, industrial waste countermeasures are not required, and
The cost of restoration work is also less than the conventional method. In addition, in the conventional method, since the pile is generally left in the ground after the concrete is removed, a foreign substance (pile) is left in the ground, but according to the method of the present invention, the ground is removed. No foreign matter is left in G.

By the way, when the heavy object 1 is an extremely heavy structure (for example, in the case of performing a decommissioning operation in a reactor structure, the reactor pressure vessel, the containment vessel, and the biological shielding wall that surrounds them are collectively formed as they are. In the case of taking out and carrying out the structure), in some cases, the frozen soil layer can be formed to reach the underground rock bed, and the weight of the structure can be supported by the frozen soil layer supported by the rock bed.

As described above, if the heavy load 1 is moved using the frozen soil layer 3, it is possible to build a temporary roadbed at an arbitrary position even in a place where the concrete roadbed is not formed, and it depends on the soil quality. There is an advantage that you can build a temporary roadbed without

"Effects of the Invention" As described above, the present invention improves the ground by the frozen soil layer formed by freezing the ground, and constructs a temporary roadbed that withstands the movement of heavy objects. It is possible to easily improve the ground at a low cost as compared with the conventional method that requires placing concrete. In addition, since the recovery work can be done by thawing the frozen layer after use, it does not require special materials for the recovery work, and compared with the conventional method that required the removal work of concrete, It has the effect of facilitating the work and not producing industrial waste.

[Brief description of drawings]

1 and 2 are for explaining one embodiment of the present invention. FIG. 1 is a vertical sectional view of the ground, and FIG. 2 is a horizontal sectional view of the ground. 1 ... Heavy load, 2 ... Freezing pipe, 3 ... Frozen soil layer, 4 ... Receiving plate, 5 ... Conveying device, G ... Ground.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Makiro Nakano 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Katsuyuki Torii 2-1-1-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (1)

[Claims] 1. A method for constructing a temporary roadbed for moving heavy goods, characterized by freezing the ground on a route for moving a heavy load to form a frozen soil layer, and temporarily improving the proof stress to build a temporary roadbed. .