JPH022118B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing piping in a piping penetration portion of a reactor containment vessel installed in a nuclear power plant or the like.

As a new energy source to replace oil, nuclear power is becoming more important than other energy sources such as coal and LNG because it can provide stable energy over a long period of time. By the way, nuclear power generation uses enriched uranium as fuel, so
To prevent radioactive materials from leaking outside, primary reactor equipment such as the reactor pressure vessel and recirculation equipment is housed within the reactor containment vessel.

As shown in FIG. 1, this type of reactor containment vessel consists of a liner material 1 made of a steel plate, which forms the inner surface of the containment vessel A, and whose function is primarily to ensure airtightness within the reactor; It is mainly composed of a concrete layer 2 which is cast integrally on the outside of the container and has the function of effectively shielding radiation etc. as is well known, and the container wall 3 has a cooling water system, an air conditioning system and Various types of piping 4, such as electrical and measuring equipment wiring, are provided to penetrate the container wall 3.

By the way, since the containment vessel A is usually a large structure, the steel materials such as reinforcing bars that reinforce the concrete layer 2 are formed by a method of assembling them together by welding or the like at the work site.

However, conventionally, as shown in FIGS. 2 and 3, the pipe penetration portion of the pipe 4 in the container wall 3 has reinforcing reinforcing bars 6 for reinforcing the concrete layer 2 and fixing the pipe 4 to the concrete layer 2. Because of the jumble, assembly of steel materials such as reinforcing reinforcing bars 6 around the piping 4 becomes complicated, resulting in problems such as poor work efficiency at the work site and difficulty in filling with concrete.

In the present invention, a large number of reinforcing reinforcing bars are placed around the piping that is installed to penetrate the wall of the reactor containment vessel, and concrete is placed around the piping to cover the base of these reinforcing bars. By constructing a piping block in advance and then integrally attaching this piping block to the piping penetration part of the container wall, the above conventional problems are eliminated, making it easy to assemble steel materials such as reinforcing reinforcing bars around the piping. It is an object of the present invention to provide a method for installing piping in a piping penetration part of a nuclear reactor containment vessel, which improves work efficiency at a work site, shortens the construction period, and can reliably fill concrete.

Hereinafter, the present invention will be explained with reference to the drawings.

Figures 4 to 6 show an embodiment of a piping block used when implementing the installation method of the present invention, and this piping block B is installed by penetrating the vessel wall of the reactor containment vessel. The pipe 10 is mainly composed of a pipe 10 for the pipe 10, and a large number of reinforcing bars 20 arranged around the pipe 10 to reinforce the container wall and fix the pipe 10 to the concrete layer. Concrete 21 is placed around the base 20a of the reinforcing steel 20 to cover it. Note that flanges 11 are provided at both ends of the pipe 10.

Next, a method of installing piping in the piping penetration portion of the reactor containment vessel using piping block B configured as described above will be explained.

First, pipe 10 near the work site or factory etc.
A large number of reinforcing bars 20 necessary for reinforcing the concrete layer of the container wall are arranged by welding etc. around the pipe 10, and concrete 21 is placed around the pipe 10 so as to cover the base of these reinforcing bars 20. The above-mentioned piping block B is constructed in advance.

Next, when assembling the liner material that forms the inner surface of the container wall of the containment vessel, after installing the piping block B at a predetermined position where the piping 10 will be installed, that is, at a position that will become the piping penetration part of the container wall, A large number of reinforcing bars 25 are arranged to be buried in the concrete layer of the container wall. The tip portions 20b of the reinforcing reinforcing bars 20 are connected to these reinforcing bars 25 by direct welding or via connecting members 26 or the like.

In the above, the pipe 10 has a large number of reinforcing bars 20 placed around it in advance near a factory or a work site, and concrete 21 is placed around the pipe 10 so as to cover the base of these reinforcing bars 20.
Therefore, it is easy to assemble the steel materials around the pipe 10, and the area around the pipe 10 can be reliably filled with concrete. In addition, when installing the above-mentioned piping block B at the work site, the reinforcing reinforcing bars 20 in piping block B
Since it is only necessary to connect the reinforcing bar 25 buried in the concrete layer to the tip end 20b of the steel bar, the work efficiency at the work site is good and the construction period can be shortened.

Moreover, FIG. 7 shows another embodiment of a piping block used when carrying out the installation method of the present invention, and this piping block C has its lower part (lower part in FIG. 7) projecting in the shape of a mountain. This makes it easier to fill the lower side of the piping block C with concrete.

In addition, a plurality of pipes 10 are lined up and the concrete layer of the container wall is reinforced and the pipes 1 are placed around the pipes 10.
A large number of reinforcing reinforcing bars 20 are arranged to fix the pipes 10 to the concrete layer, and concrete is placed to cover the bases of these reinforcing bars 20.
A piping block having such a piping block may be constructed, and such a piping block can particularly effectively cope with work in a pipe penetration part where a plurality of pipes are located close to each other.

In addition, in the example, the method of installing piping at the piping penetration part of the reactor containment vessel was described, but it can also be applied to other concrete tanks, silos, etc. where piping is installed penetrating the vessel wall. Needless to say.

As detailed above, according to the present invention, a large number of reinforcing reinforcing bars are installed in advance at a factory or near a work site, etc. around the piping to be installed by penetrating the vessel wall of the reactor containment vessel. In order to construct a piping block by pouring concrete around the piping so as to cover the base of these reinforcing reinforcing bars, and using this piping block to attach the piping to the piping penetration part of the reactor containment vessel. , it is easy to assemble steel materials such as reinforcing bars around the pipes, improving work efficiency at the work site, shortening the construction period, and has excellent effects such as being able to reliably fill the area around the pipes with concrete. .

Furthermore, it has the advantage that it can be applied not only to reactor containment vessels but also to other tanks and silos that are installed through piping, and similar effects can be obtained.

[Brief explanation of drawings]

Figure 1 is a schematic perspective view of the reactor containment vessel, Figures 2 and 3 are shown to explain the conventional structure around the piping, Figure 2 is a front view, and Figure 3 is a cross-sectional view. 4 to 6 show an embodiment of the piping block used in the present invention, in which FIG. 4 is a perspective view, FIG. 5 is a front view, FIG. 6 is a sectional view, and FIG.
The figure is a front view showing another embodiment of the piping block used in the present invention. B...Piping block, C...Piping block, 1
0...Piping, 20...Reinforcement bar, 20a...Base, 20b...Tip, 21...Concrete,
25...Reinforced steel.

[Claims]

1. A large number of reinforcing reinforcing bars for reinforcing the concrete layer of the vessel wall are arranged in advance around the piping to be installed to penetrate the vessel wall of the reactor containment vessel to form a piping element, and then After installing the piping element with one side of the connection port opened inside the containment vessel and the other side connected to the outside of the containment vessel for the pipe penetration part of the vessel wall, the piping element is buried in the concrete layer of the vessel wall. A method for installing piping in a piping penetration part of a nuclear reactor containment vessel, characterized by arranging a large number of reinforcing bars and connecting the reinforcing reinforcing bars to these reinforcing bars.