JP4507220B2 - How to install large heavy objects in the ground - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for installing a large heavy object in the ground.
[0002]
[Prior art]
In order to store, store, dispose of, and dispose of large heavy objects such as reactor pressure vessels and steam generators, some overseas methods are used to embed them in the ground.
A common method that can be considered when adopting such a treatment method in Japan is to dig a shaft beforehand and suspend large heavy objects with a crane or hydraulic jack after the completion of the shaft and backfill with earth and sand. Is the method.
[0003]
[Problems to be solved by the present invention]
The above-described conventional installation method for large heavy objects in the ground has the following problems.
<I> The excavation of the shaft cannot be performed in parallel with the hanging work of a large and heavy heavy object. Therefore, the whole construction period becomes long.
<B> Special cranes and hydraulic jacks that suspend large and heavy objects require special equipment and are uneconomical.
<C> It is dangerous to suspend large and heavy waste in the deep ground, and sufficient countermeasures are required.
[0004]
[Object of the present invention]
The present invention was made to solve the conventional problems as described above. In a short construction period, a large-sized heavy object can be safely installed in the ground without using special equipment and devices. It aims at providing the installation method of a heavy article.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the method for installing a large heavy object in the ground according to the present invention is to install on a ground surface with a rotary excavating blade of a drilling machine which is a shield excavator or a tunnel boring machine facing downward. , the inside or top of the excavating machine is placed the large-scale heavy weight substance to be installed objects, drilling ground by rotation downward digging edge of the excavating machine, lowered by the weight of its own weight and the large heavy and, taking a reaction force around the excavation traces Once lowered to a certain depth, the large weight of the excavating machine and the top by the shield of the excavating machine is advanced in the ground, drilling Once you have reached a predetermined depth Exit advance, returning is performed subsequent to filling of the excavation marks, in which features a method of installing the ground of a large heavy.
[0006]
[Embodiments of the present invention]
Hereinafter, embodiments of a method for installing a large heavy object in the ground according to the present invention will be described with reference to the drawings.
[0007]
<I> Drilling device.
In order to install heavy objects in the ground, the ground is excavated by an excavator.
For this purpose, for example, a shield machine, a tunnel boring machine, and other known excavators and excavators can be used.
Therefore, although the following description is an Example using a shield machine, it does not exclude construction and installation by other excavation apparatuses, and is merely an example of an excavation apparatus.
[0008]
<B> Installation of shield machine 1
The shield machine 1 is installed on the ground surface with the digging blade 2 facing downward.
The shield machine 1 has a diameter larger than the projected cross section of the heavy object 3 to be installed.
[0009]
<C> Installation of heavy objects 3
A large heavy object 3 to be installed, such as a reactor pressure vessel, is installed in or on the shield machine 1.
The large heavy object 3 installed and stored in the upper part of the shield machine 1 may be single or a plurality of large heavy objects 3 may be installed.
[0010]
<D> Drilling of shield machine 1.
The shield machine 1 excavates the ground by the downward rotation of the excavating blade 2 and descends by its own weight and the weight of the heavy object 3.
After descending to a certain depth, a concrete segment 4 is assembled around the excavation trace and the wall surface of the shaft is installed.
The shield machine 1 is dug by taking a reaction force on the segment 4 and extending the jack.
In this way, the shield machine 1 and the large heavy object 3 on the top enter the ground by the shield machine 1.
In the case of an excavator other than a shield machine, the wall surface may be constructed by placing concrete on the wall surface of the excavation site.
[0011]
<E> Backfill.
When the shield machine 1 reaches a predetermined depth, the excavation is terminated.
At the same time that the shield machine 1 arrives at a predetermined depth, a large heavy object 3 is also installed at a predetermined depth in the ground.
In some cases, after that, recoverable parts such as parts of the shield machine 1 are collected. In addition, sensors that detect leaks of radioactive materials are attached to heavy objects.
The excavation trace of the shield machine 1 is formed as a deep shaft 5 in the ground.
Backfill 6 is performed by introducing earth or sand or concrete from the ground into the shaft 5 of the excavation site.
[0012]
[Effect of the present invention]
Since the installation method of the large heavy article of the present invention in the ground is as described above, the following effects can be obtained.
<I> The excavation process of the shaft and the lifting and lowering process of the large heavy object 3 are integrated.
Therefore, when the excavation process is completed, the lifting and lowering process is also completed, and the construction period can be greatly shortened.
<B> Special equipment and devices such as cranes and hydraulic jacks for suspending large heavy objects 3 are unnecessary and economical.
<C> Since the construction of the shaft and the installation of the heavy object 3 are completed at the same time, there is no hanging work process. For this reason, it is not necessary to take measures to prevent the large heavy object 3 from falling and to evaluate the safety at the time of dropping.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram of a construction sequence of a method for installing a large heavy article into the ground according to the present invention.
FIG. 2 is an explanatory diagram of a construction process.
FIG. 3 is an explanatory diagram of a construction process.

Claims (2)

Installed on the ground surface with the rotary excavating blade of the excavating machine that is a shield machine or tunnel boring machine facing down,
The inside or top of the excavating machine is placed the large-scale heavy weight substance to be installed target,
The excavation machine excavates the ground by the downward rotation of the excavating blade, descends due to its own weight and the weight of the large heavy object, and when it descends to a certain depth, it takes a reaction force around the excavation trace , excavation by to enter the large weight of the excavating machine and the top in the ground,
Exit et excavation proceeds reaching a predetermined depth,
Backfill carried out subsequent to the excavation marks,
Installation method of large heavy objects in the ground . Inside or upper portion of the excavating machine, a single number Oh Rui is performed by installing a plurality of the large heavy,
The installation method of the large-sized heavy article of Claim 1 in the ground .

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