JPH022119B2 - - 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 above-mentioned containment vessel A is usually a large structure, a construction method is used in which steel materials such as reinforcing bars that reinforce the concrete layer 2 are assembled 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.

The present invention solves the above-mentioned conventional problem by configuring a piping element by arranging in advance a large number of reinforcing reinforcing bars for reinforcing the concrete layer around the piping, and by integrally attaching this piping element to the pipe penetration part of the container wall. It is easy to assemble steel materials such as reinforcing reinforcing bars around the piping, improving work efficiency at the work site, and shortening the construction period. The purpose is to provide an installation method.

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

4 to 6 show an example of a piping element used when implementing the installation method of the present invention, and this piping element B includes a piping 10 and a mesh pattern around the piping 10. It is composed of a large number of reinforcing bars 20 arranged vertically and horizontally to reinforce the concrete layer of the wall of the reactor containment vessel and to fix the piping 10 to the concrete layer, and the piping 10 has flanges at both ends. 11 are provided. In the figure, reference numeral 21 denotes reinforcing reinforcing bars arranged concentrically around the pipe 10 and welded to the reinforcing reinforcing bars 20, so as to increase the structural strength around the pipe 10.

Next, piping element B configured as above
A method of installing piping in the piping penetration part of the reactor containment vessel using this method will be explained.

First, a large number of reinforcing reinforcing bars 20 necessary for reinforcing the concrete layer of the vessel wall are welded in advance at a factory or near the work site around the piping 10 that is installed to penetrate the vessel wall of the reactor containment vessel. The above-mentioned piping element B
Configure. In addition, at this time, reinforcing reinforcing bars 21 are welded to the reinforcing reinforcing bars 20 arranged in the mesh shape in a concentric manner with the pipe 10.

Next, when assembling the liner material that forms the inner surface of the containment vessel, the piping element B is connected to the pipe penetration part of the vessel wall, and the connection port 10a on one side of the piping element B is inserted into the containment vessel, and the other After opening the side connection port to the outside of the containment vessel and fixing it to the liner material by welding or the like, a large number of reinforcing bars 25 are arranged to be buried in the concrete layer of the vessel wall. Then, the reinforcing reinforcing bars 20 of the piping element B are connected to these reinforcing bars 25 by welding or via attachment members 26 or the like.

In the above, steel materials such as reinforcing bars 20 necessary for reinforcing the concrete layer are placed around the pipe 10 in advance near the factory or work site, so it is easy to assemble the steel materials around the pipe 10. Yes, and the above piping element B at the work site
When installing, it is only necessary to connect the reinforcing bars 25 of the concrete layer to the reinforcing bars 20 of the piping element B, which improves work efficiency on site and shortens the construction period.

Note that by arranging a plurality of pipes 10, these pipes 10
Reinforcement reinforcing bars 2 are installed around the container wall to reinforce the concrete layer and to secure the pipe 10 to the concrete layer.
0, 21 may be arranged to form a piping element having a plurality of pipes 10, and such a piping element is suitable for work in pipe penetrations where there are a plurality of pipes close to each other. can be dealt with particularly effectively.

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 explained above, according to the present invention, a large number of reinforcements for reinforcing the concrete layer of the container wall are installed around the piping to be provided in advance at the factory or near the work site to penetrate the container wall of the reactor containment vessel. Piping elements are constructed by arranging reinforcing bars, and piping is installed using these piping elements, making it easy to assemble steel materials such as reinforcing bars around the piping, improving work efficiency on the work site, and It has excellent effects such as being able to shorten the construction period and also being able to reliably fill the area around the pipes with concrete. Further, it has the advantage that it can be applied not only to a nuclear reactor containment vessel but also to other tanks or silos etc. in which piping is installed through, 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 structure around conventional piping, Figure 2 is a front view, and Figure 3 is a front view.
The figure is a sectional view, and Figures 4 to 6 show an embodiment of the piping element used in the present invention.
FIG. 4 is a perspective view, FIG. 5 is a front view, and FIG. 6 is a longitudinal sectional view. A... Containment vessel, 2... Concrete layer, B...
...Piping element, 10...Piping, 10a, 10
b... Connection port, 20, 21... Reinforcement bar, 25...
...reinforced steel.

[Claims]

1. A reactor vessel containing liquid metal, a reactor vessel lid for sealing this reactor vessel, a plurality of upper plates installed in close contact with the lower surface of this reactor vessel lid, and these upper plates. a lower plate provided facing each other, a spacing member provided at the center of the upper plate and the lower plate to maintain a constant distance between the upper plate and the lower plate, and each of the opposing upper plates. A flexible thin film connects the outer periphery of the lower plate,
A heat insulating material surrounded by this thin film and held so as not to apply the mechanical load to the thin film, and an atom that penetrates through holes arranged in the center of the upper plate and lower plate, respectively, connect the upper plate and the lower plate. A thermal resistor for a reactor vessel lid, consisting of a hanging member attached to the reactor vessel lid.