JPH06130182A - Method for laying radiation shield penetration pipe in building having radioactive substance and embedding block for the radiation shield used for the method - Google Patents

Abstract

PURPOSE:To obtain a pipe penetration laying method superior in radiation shield performance by fabricating in a factory pipe embedding precast concrete blocks having exact three dimensional lengths and exactly positioning this in the opening for lead pipe penetration at the site. CONSTITUTION:Frames are placed along reference lines XYZ in a factory and the supports 12 of frame steel are fixed to the frames. A plurality of pipes 14 for penetration are bended in a specified three dimensional shape with bend fabrication or welding and fixed to the support 12. Hooks 16 for hanging blocks and adjusting bolts 18 are arranged at proper points, concrete 20 is injected and solidified to make pipe embedded precast concrete blocks 10. The blocks 10 are transported to the site, inserted in an opening for lead pipe penetration, exactly positioned for the reference lines of the building by handling the adjusting bolts and fixed with liners and wedges to fill the gap. That is, the block 10 can be positioned exactly to each 14 inlet and outlet and can be welded to the main pipe.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a spent nuclear fuel reprocessing plant, a nuclear power plant, and other structures, constructs a through pipe at a conduit opening formed in a wall, floor, or ceiling of the structure. On how to do. The present invention is
It also relates to a conduit burying block used to carry out such a method.

[0002]

2. Description of the Related Art In a structure such as a nuclear power plant where radioactive materials such as nuclear fuel and radioactive pollutants are present, a design for shielding radiation is required. Especially in the spent nuclear fuel reprocessing plant,
Since a much higher concentration of radioactive materials is handled than in a nuclear power plant, the structure of the reprocessing plant is divided into a number of small rooms called cells, and the concrete partitions placed between the cells cause radiation Is shielded to prevent radiation from leaking from one cell to another. A large number of stainless steel pipes are laid in the plant to transfer the fluid to be processed between the cells. Due to the large number of cells in the reprocessing plant as described above, the stainless steel pipe must penetrate the concrete partition wall in many places.

In order to make it possible to pierce each of the stainless steel pipes through the concrete partition walls between the cells, when the plant is constructed, the primary casting concrete partition walls such as the walls, floors and ceilings of the cells are preliminarily penetrated with conduits. There is an opening for use. After pouring the primary concrete, it is referred to as a penetrating pipe, and a relatively short stainless steel pipe for the penetrating pipe is preliminarily provided in this opening, and then the secondary concrete is poured to close this opening. Finally, the ends of the stainless steel pipe main body extending inside the cell are butted against both ends of the pipe for the penetration portion, and they are butted and welded in an atmosphere of an inert gas such as argon. Penetration pipes may also be used to penetrate power cables, communication cables, and the like.

When the pipes for the through portions are straight, the radiation penetrates through the partition wall, so that it is necessary to take measures such as bending the respective pipes for the through portions when piping the through portions.

Conventionally, in the case of the through pipes, the stainless pipes for the through pipes are bent one by one by bending or welding, and these pipes are preliminarily fixed to a frame made of steel mold, and this assembly is assembled. After fixing to the opening for penetration of the conduit of the partition wall or fixing these pipes directly to the opening for penetration of the conduit at the construction site, the formwork was assembled and the secondary concrete was cast on site.

Since this construction method involves a lot of on-site work, it not only takes time but also requires a long construction period.

Further, according to this construction method, there is a possibility that the original installation position of the penetrating pipe is slightly displaced due to the influence of secondary concrete pouring. By the way, in order to enable the factory prefabrication of the stainless steel pipe main body, accurate information about the three-dimensional dimensions of the pipe for the penetration portion is required. Therefore, as mentioned above, when the original installation position of the penetration pipe is displaced by the secondary concrete pouring, it is indispensable to accurately measure the three-dimensional dimensions of the penetration pipe after the secondary concrete pouring. Become. This measurement was extremely difficult because it was a work at a high place on the scaffold at the site. In addition, since the gravity flow method is often used as the fluid transfer method in reprocessing plants, there are many three-dimensional oblique arrangements in the pipes for the through parts, and it is necessary to measure accurate dimensions on the scaffold at the site. Was time-consuming, and the measurer had a great deal of difficulty.

In addition, during the period from the installation of the penetration pipe to the placement of the secondary concrete, the penetration pipe is protected from external force and impact, and corrosion of the pipe is prevented. Was needed.

Further, in the case of in-situ casting of secondary concrete, there is a possibility that the concrete flow will be obstructed by the pipe for the penetration part and the concrete will be insufficiently filled. It was hard.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for constructing a through-portion pipe capable of positioning the through-portion pipe with high accuracy.

In another aspect, an object of the present invention is to provide a pipe penetrating portion having excellent radiation shielding performance.

[0012] In another aspect, an object of the present invention is to provide a method for constructing a through pipe which can reduce work at high places and simplify work.

In another aspect, an object of the present invention is to shorten the construction period of the piping for the penetration portion.

Another object of the present invention is to provide a conduit-buried precast concrete block suitable for carrying out such a method.

[0015]

[Constitution of the invention]

In the present invention, the pipe-embedded precast concrete block is prefabricated at a place different from the plant construction site, for example, a factory. Therefore, first, the penetrating pipe is processed into a curved predetermined shape and a predetermined dimension. The pipe is then rigidly secured to a frame or support so that its inlet and outlet are accurately three-dimensionally positioned along the factory reference line. A pipe-embedded precast concrete block is obtained by placing the concrete around the pipe, after non-destructively testing the conduit if necessary.

Since the concrete pouring can be carried out on a small scale in a factory or the like, the pipe is less likely to move due to vibration during pouring. Therefore, the penetration pipe is accurately positioned in the block in three dimensions. Further, the workability is better than the work at the plant construction site, and since concrete can be densely filled, a block having no radiation and excellent radiation shielding performance can be obtained. Since these works can be carried out in the factory, work at high places is not necessary and can be carried out easily.

The block thus manufactured is carried into a plant construction site and installed in an opening for penetration of a conduit in a partition wall. Then, the position of the block relative to the site reference line is accurately adjusted. The position adjustment can be easily performed by the position adjusting mechanism provided on the block. By this position adjustment, the block can be fixed so that the inlet and outlet of the penetration pipe are located at desired three-dimensional positions with respect to the site reference line. Finally, concrete is filled between the conduit penetration opening and the block and the block is installed.

Thus, first a pipe-embedded precast concrete block with accurate three-dimensional dimensions is prefabricated in the factory, and then this block is precisely installed in the conduit penetration opening at the plant construction site. It is possible to obtain the through-portion piping in which the through-portion pipe is positioned at an accurate three-dimensional position with respect to the site reference line. Also,
Since the work on the plant construction site is minimized, the construction period of the site work is shortened and the interference from the work of other industries is also minimized.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the accompanying drawings showing the embodiments of the present invention. First, referring to FIG. 1, a pipe-embedded precast concrete block 10 of the present invention and a method for manufacturing the same will be described.
A mold (not shown) is installed in a known manner with reference to the factory reference line XYZ, and a support 12 made of mold steel or the like is fixed to the mold at a predetermined position. Multiple penetration pipes 1
4 is bent into a predetermined three-dimensional shape and a predetermined dimension by bending or welding, and firmly fixed to the support 12 by welding or the like. Next, the pipe 14 for the penetrating portion of the block 10
Are subjected to non-destructive inspection and pressure resistance test as necessary. After arranging the hooks or eyebolts 16 for suspending the block and the adjusting bolts 18 for position adjustment at appropriate places, concrete 20 is poured and solidified. Once the form is removed, the pipe-embedded precast concrete block 10 is obtained.

Referring to FIG. 3, the pipe-buried precast concrete block 10 thus prepared.
Are transported to the reprocessing plant construction site, for example the truck 21
Is carried in along the internal passage 22 of the plant, and is carried into the specific cell 26 through the construction opening 24. The cell 26 comprises a concrete ceiling 28, a bulkhead 30 and a floor 32, which in the illustrated plant communicate with adjacent cells 34 and 36 via conduit through openings 38 and 40, respectively. .

The block 10 is suspended from a ceiling hook 46 using, for example, a wire 42 and a hoist 44 as shown in FIG. It is carried into the conduit passage opening 38. Next, as shown in FIG. 2, by operating the adjusting bolt 18 arranged on the block 10, the block 10 is accurately positioned with respect to the reference line of the building, and is fixed by the liner, the wedge 48, or the like. (Figure 3). Finally, the formwork is attached along the wall surface, and the gap between the block 10 and the conduit through opening 38 is filled with concrete.

As shown in FIG. 3, the conduit penetration opening 40 between the cells 26 and 36 has a similarly constructed, differently shaped, pipe-buried precast concrete block 5.
0 can be closed in a similar manner.

The block 10 or 5 installed in this way
At 0, the inlet and the outlet of each of the penetration pipes 14 are accurately positioned, so that the stainless steel pipe main pipe of the plant can be prefabricated and welded without performing the dimension measurement again.

In the above description of the embodiments, the method of the present invention has been described as being applied to a reprocessing plant, but the present invention is not limited to this and can be applied to other buildings. .

[0025]

According to the present invention, when manufacturing a pipe-buried precast concrete block, concrete pouring can be performed in a factory or the like having good workability, so that concrete can be densely filled. It is possible to realize a through pipe having excellent radiation shielding performance.

In another aspect, the penetration pipe is positioned with high precision within the conduit penetration opening of the radiation shielding bulkhead and prefabricated fabrication and welding of the pipe main does not require field measurements. Therefore, it is possible to reduce the work at high places on the site and simplify the work at the site.

Further, since the work on the plant construction site is minimized, the construction period of the site work is shortened and the interference received from the work of other industries is also minimized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conduit-embedded precast concrete block of the present invention.

FIG. 2 is a side view showing alignment of a conduit-buried precast concrete block.

FIG. 3 is a cross-sectional view of a cell of a reprocessing plant showing installation of a conduit-embedded precast concrete block in an opening in a partition.

[Explanation of symbols]

10, 50: Pre-cast concrete embedded in conduit
Block 12: Support 14: Curved conduit 16: Suspending means 18: Position adjusting means 20: Concrete body of block 38, 40: Cell partition wall opening for conduit penetration

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Shitara 3-17 Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa JGC Construction Co., Ltd. (72) Inventor Mikio Igarashi Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa No. 3-17 JGC Corporation

Claims (4)

[Claims] 1. Walls, floors of buildings in which radioactive material is present,
When constructing a radiation shielding penetrating pipe in a conduit penetrating opening formed in a building structure element such as a ceiling, prepare a curved conduit of a predetermined shape and size at a place away from the construction site, and A conduit-embedded precast concrete block in which the conduit is accurately positioned in three dimensions by accurately positioning the conduit in three dimensions along the reference line of the location and by placing concrete around the conduit. Is pre-fabricated, the block is brought into the construction site, and then temporarily installed in the conduit penetration opening, and the position of the block is adjusted so that the conduit is located at a desired position three-dimensionally with respect to the reference line of the building. A method of constructing a radiation shielding penetrating pipe of a radioactive material existing building structural element, characterized in that the block is installed after adjustment. 2. A method according to claim 1, characterized in that said positioning of the conduit is performed by fixing the conduit to a predetermined support. 3. A conduit-embedded precast concrete block for shielding against radiation the openings for penetration of conduits formed in structures such as walls, floors and ceilings of spent nuclear fuel reprocessing plants. A body, a curved conduit embedded in the body for penetrating the body and having ends accurately positioned three-dimensionally along a reference line of the body, and a body for the conduit penetrating opening. A radiation-blocking conduit-embedded precast concrete block comprising position adjusting means for adjusting the position three-dimensionally. 4. A conduit-embedded precast concrete block installed in a conduit penetrating opening formed in a building structure element such as a wall, floor, or ceiling of a building, the main body being made of concrete; A conduit embedded in the body for penetrating the body having ends accurately positioned three-dimensionally along a reference line, and for three-dimensionally adjusting the position of the body with respect to the conduit passage opening. A precast concrete block for embedding in a conduit, which comprises the position adjusting means and the suspending means fixed to the main body.