JPH09133792A - Concrete wall penetration piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce construction cost by preventing the break of piping or concrete. SOLUTION: Regarding a concrete wall penetration pipeline 1a led through a radiation shielding concrete wall 4 such as the cell of a reprocessing plant, the portion of the pipeline 1a buried in the concrete wall 4 is bent as angled and a cushion and insulation material 2 is wound around the portion of the pipeline 1a to the prescribed thickness. In addition, a waterproofing layer 3 is formed around the cushion and insulation material 2. As a result, the cushion and insulation material 2 restrains heat transfer from the high temperature piping 1a to the concrete wall 4, thereby restraining the temperature rise of the concrete wall 4. Also, the cushion function of the cushion and insulation material 2 acts to absorb the thermal elongation of the high temperature piping 1a, thereby preventing the occurrence of thermal stress. The waterproofing tape (waterproofing layer) 3 also prevents water moisture contained in ready- mixed concrete to enter the cushion and insulation material at the time of concrete placement, thereby preventing a drop in cushion and insulation function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete wall penetrating pipe that penetrates a concrete wall that shields radiation such as cells of a reprocessing plant.

[0002]

2. Description of the Related Art In a reprocessing plant, a facility containing a highly radioactive fluid is required to contain and shield radiation. From this requirement, a sealed room called a cell is surrounded by a concrete wall, A highly radioactive fluid is contained inside. Therefore, the pipe for supplying steam or the like to the equipment in the cell penetrates the concrete wall because the supply source of steam or the like is outside the cell. .

Generally, the concrete wall penetrating pipe is directly buried in the concrete wall in order to satisfy the shielding requirement. However, high temperature pipe such as steam pipe has a structure capable of absorbing thermal displacement and thermal stress of the pipe. There is a need. Further, when the temperature of concrete is heated to 80 ° C. or higher, the radiation shielding performance deteriorates, so it is necessary to consider heat shielding from the pipe to the concrete.

FIG. 4 shows a conventional example of piping for penetrating a concrete wall.
As shown in FIG. In the concrete wall penetrating pipe of FIG. 4, a structure in which a special shielding material (shielding material containing lead) 5 having elasticity and radiation shielding property is filled around the high temperature pipe 1c is incorporated in the concrete wall 4. . The concrete wall penetrating pipe of FIG. 5 is a double pipe system in which the high temperature pipe 1d is passed through the penetrating sleeve 6, and an auxiliary shielding plate 7 is added to the concrete wall 4 in order to prevent leakage of radiation.

[0005]

The cell (closed room) of a reprocessing plant or the like is surrounded by a concrete wall to shield radiation. The following problems must be solved in this concrete wall and high-temperature piping that penetrates it. (1) When moisture in concrete is released, the shielding performance of the concrete wall deteriorates, so it is necessary to keep the concrete temperature at about 80 ° C or lower. (2) Since the radiation travels in a straight line, if the straight pipe portion of the pipe is long, the radiation penetrates along the pipe and the effective shielding thickness of the concrete decreases. (3) As a measure for the above item (2), there is a measure for bending the pipe so as to bend it in concrete. In this case, thermal stress is generated in the bent portion of the pipe due to thermal expansion of the pipe, and the pipe or Concrete is damaged.

However, the concrete wall penetrating pipe shown in FIG. 4 has a structure in which a special shielding material (shielding material containing lead) 5 having elasticity and radiation shielding property is filled around the high temperature pipe 1c. Since it is built in the wall 4, an expensive shielding material 5 is required, and there is a drawback that the construction cost becomes high. Further, the concrete wall penetrating pipe shown in FIG. 5 is a double pipe system in which the high temperature pipe 1d is passed through the penetrating sleeve 6, and absorbs thermal expansion in the gap between the high temperature pipe 1d and the penetrating sleeve 6, and also has a heat insulation effect I try to have it,
In this case, the non-concrete part (porosity) increases,
The shielding efficiency is reduced, and the auxiliary shielding plate 7 is required.
There is a drawback that the burying work of the pipe in the concrete wall becomes complicated and the construction cost becomes high.

The present invention has been proposed in view of the above problems, and an object thereof is to provide a concrete wall penetrating pipe capable of preventing damage to the pipe or concrete and reducing the construction cost. is there.

[0008]

In order to achieve the above-mentioned object, the present invention provides a concrete wall penetrating pipe that penetrates a concrete wall that shields radiation such as cells of a reprocessing plant and is embedded in the concrete wall. The pipe portion to be bent is bent so as to be bent, and a buffer / heat insulating material is wound around the buried pipe portion to a certain thickness, and a waterproof layer is formed around the buffer / heat insulating material.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Next, a concrete wall penetrating pipe of the present invention will be described with reference to a first embodiment shown in FIGS. 1 and 2.
a is high temperature piping, 4 is a concrete wall, and the same high temperature piping 1a
Of the high temperature pipe 1a embedded in the concrete wall 4
The portion is bent so as to be bent in an inverted V shape.

2 is a buffer / heat insulating material, and the same buffer / heat insulating material 2
Is wound around the buried high temperature pipe 1a to a constant thickness. This thickness is determined by the temperature condition (adiabatic condition) and thermal expansion of the high temperature pipe 1a. 3 is a waterproof tape (waterproof layer), and the waterproof tape 3 is a cushioning / insulating material 2
Is formed around. Further, waterproof paint or the like is applied to the waterproof tape 3 as needed.

Next, the operation of the concrete wall penetrating pipe shown in FIGS. 1 and 2 will be specifically described. The cushioning / heat insulating material 2 suppresses heat transfer from the high-temperature pipe 1a to the concrete wall 4 and suppresses an increase in temperature of the concrete wall. Also the same buffer
The thermal insulation of the high temperature pipe 1a is absorbed by the cushioning function of the heat insulating material 2 to prevent generation of thermal stress. Further, when the waterproof tape (waterproof layer) 3 is poured into concrete, it prevents the moisture in the fresh concrete from entering the buffer / heat insulating material 2 and lowering the buffer / heat insulating performance.

(Second Embodiment) FIG. 3 shows a second embodiment. Reference numeral 1b is a high temperature pipe, and the high temperature pipe 1b portion embedded in the concrete wall 4 of the high temperature pipe 1b is bent so as to be continuously bent into an inverted V shape and a V shape. Further, the cushioning / insulating material 2 is wrapped around the high-temperature pipe 1a portion to be embedded in a certain thickness, and the waterproof tape 3 is formed around the cushioning / insulating material 2. Also in this embodiment, the same as above. The action takes place.

[0013]

As described above, in the concrete wall penetrating pipe of the present invention, the cushioning / insulating material suppresses the heat transfer from the pipe to the concrete wall and suppresses the temperature rise of the concrete wall. Further, the buffering function of the same cushioning / insulating material absorbs the thermal expansion of the pipe and prevents the generation of thermal stress, so that the pipe or concrete can be prevented from being damaged.

Further, when the waterproof layer is poured into concrete, water in the fresh concrete is prevented from invading the buffer / heat insulating material and preventing the buffer / heat insulating performance from being deteriorated. Therefore, an expensive shielding material or auxiliary shielding plate is attached. Work can be eliminated and construction costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of a concrete wall penetrating pipe of the present invention.

FIG. 2 is a vertical sectional side view of the concrete wall penetrating pipe.

FIG. 3 is a vertical sectional side view showing a second embodiment of the concrete wall penetrating pipe of the present invention.

FIG. 4 is a vertical cross-sectional side view showing a conventional concrete wall penetrating pipe.

FIG. 5 is a vertical sectional side view showing another conventional concrete wall penetrating pipe.

[Explanation of symbols]

 1a, 1b Piping (high temperature piping) 2 Buffer / heat insulating material 3 Waterproof layer (waterproof tape) 4 Concrete wall

Front page continuation (72) Koichi Tanimoto, 1-1 1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture, Takasago Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Mitsuo Tamaki 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy industry Takasago Research Institute

Claims (1)

[Claims] 1. In a concrete wall penetrating pipe that penetrates a concrete wall that shields radiation such as cells of a reprocessing plant, the pipe portion embedded in the concrete wall is bent to be bent, and the embedded pipe portion is bent. Wrap a cushioning / insulation material around the
A concrete wall penetrating pipe characterized in that a waterproof layer is formed around the heat insulating material.