JPS5967495A - Method of constructing atomic power facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a construction method for nuclear power facilities, and in particular to a biological shielding wall (hereinafter referred to as SW) surrounding a nuclear reactor containment vessel (hereinafter referred to as PCV).
construction work of the main steam pipe (hereinafter referred to as MS) tunnel room adjacent to Nuclear equipment suitable for use in construction work
Concerning construction methods.

[Technical background of the invention]

As shown in Figures 1 and 2, MS) tunnel room/ is a POV in reactor building a, ? The PCV penetration %ils, MS
Co-valve 6a, FDW β-valve 6b, common pedestal 7, MS J
Valve ga, FDW third valve t b, piping? , POV penetration pipe bellows 10, piping anchor/c and POV shell 1] trade'
Internal piping/, 2nd class FDW.

MS system piping and its stand have been installed.

Conventionally, when constructing this nuclear power facility for rice, the steps qMl to No. 1 are carried out according to the procedure shown in Fig. 7 and Fig. 7(a).

That is, first the floor of the tunnel room l is constructed, then the walls are constructed, and finally the ceiling is constructed.

After the construction work for the MS tunnel room is completed, the building will be vacated, and the construction of the piping section and other parts on the side of the building will begin. This is because during the curing period after concrete is removed from the ceiling, shoring/3 is erected inside the MS tunnel room l to support the load of the ceiling, as shown in Figure 9.
This is because piping etc. cannot be brought in until after the removal of the pipes.

When the building is vacated, the piping 9, as shown in Figure S,
MS gp, Koben Otsu a, MS 3rd valve g a, F
DW third valve Ab, FDW third valve rb, and common stand 7
into the MS tunnel room/inside.

Next, as shown in Fig. 6, the end of the PCV penetration pipe is first processed and the PCV penetration pipe bellows 10 is installed, and then the POV penetration pipe internal piping 7.2 is welded and both box lambda valves Aa and Ab are installed. Do the following.

Next, the common pedestal 7 is installed, and both second valves 4a are installed.
, Ab and both the third valves ga and g'o are installed, and then the three temperature valves ga and gb are installed and the piping anchors for fixing the piping to the common frame 7 are installed. Perform installation. After that, the connecting piping with both third valves ga and g'o will be constructed.

[Problems with background technology]

With the conventional construction method explained above, it is not possible to start construction on the machinery side until the building is vacated within 2 days.
Moreover, when carrying out construction work on the machine side, each part is first transported into the MS tunnel room, and then one of these parts is installed inside the MS tunnel room. For this reason, the construction process becomes long, the number of man-hours increases, and there is a risk that the quality will deteriorate because the machinery is not working properly.

[Purpose of the invention]

The present invention was developed in view of the current situation, and an object thereof is to provide a construction method for nuclear power facilities that can shorten the construction period and improve the quality of the construction period.

[Summary of the invention]

The present invention is to make the pipes, valves, and their mounts that are folded into the building into a unitary structure by pre-tapping them together, thereby improving the quality of the machinery. The unit was carried into the building and the frame was dug out, and then a partition plate was installed between the building and the frame, supported only by H, T and the frame to form a 4-part ceiling filling form. It is characterized by the fact that the construction work on the ceiling side and the construction work on the unit side are carried out in parallel, and the kneading process significantly shortens the construction period and reduces the number of man-hours.

[Embodiments of the invention]

The present invention will be explained below by taking the construction of the MS) tunnel room part as an example. Figures 2 to 11 show the construction method of the MS) tunnel room part 7 in order according to the construction procedure, and Figures 1 and 1 show the details of the Pyhx" unit 20 installed in the λ48 tunnel. First, the floor of the tunnel room and the offshore construction work 43 After that, the unit 20 was carried in and its common pedestal 7 was installed, and then SW 419 (supporting name of i, ・1 material, shared with 2/a, support sand (material) of pedestal 7141i)/b and Between these supporting materials 2/h,
:), /j), and then the MS tunnel room /
Construction on the ceiling side and construction on the unit 20 side are carried out in parallel.

As shown in Figures W7.2 to 7d:n, the unit 20 includes an IAS a valve 4a, a FDW valve A t),
Common mount 7, M B J valve, ga, FDW 3rd valve gb
, piping 9, and piping anchor/l, and this unit 20 is installed in advance in the factory. The welding work, stress relief, and inspection ship were carried out, and it was completed +j-! 'It is integrated as a product. This unit 20 is to be carried into the building after the building walls of the MS tunnel room are constructed.

Next, the construction method of the MS tunnel chamber/section will be explained with reference to FIGS. 2 to 1 and FIG. 7(b).

During construction, first construct the floor of the MS tunnel room/, as shown in Figure 2, then move the 5WII, which also serves as the wall of the MS) tunnel room, to the ceiling of the MS) tunnel room/in POV 3.
Constructed to surround. Then, attach the supporting silver material 2/a to the top of SW<t.

Next, as shown in FIG. 9, the unit 2o is carried into the MS tunnel room/, and the common pedestal 7 is installed.

After that, the support steel 121b is attached to the top of the common frame 7 which has a height up to the ceiling of Ms) tunnel ♀/, and as shown in Figure 1O, it is connected to the supporting copper phase 2/a on the 5Wll side. Place several deck plates 22 in between. After that, work on the ceiling side and work on the unit l side will be carried out in parallel.

That is, on the ceiling side, reinforcing work and concrete work are performed, while on the unit J side, connections are made between unit 1 and other piping.

When making this connection, first, as shown in Figure 1/
After processing the end of the through-through pipe, install the PCV7 through-pipe bellows 1.
0 to J, and then weld the pave J internal piping VIA and both box a valves A a and 6'b of the unit 20.

For this purpose, the piping anchor l/ of the unit 20 is once removed and welding is performed, and after welding, the m degree distribution anchor // is attached and fixed (jl g to the common frame 7.

Next, connect the connecting piping with the three valves ga, g, and b of both boxes to 1. I will work on it.

However, by carrying out the construction method described above, M
S) By waiting for the completion of the ceiling work 41 in the tunnel room l, the work on the cuff machine side can be carried out.Since the machine side is unitized, the work period can be significantly shortened and the number of cuts can be reduced. can.

Furthermore, since the unit 20 is assembled in a factory with a good atmosphere, quality can be improved compared to the conventional method of on-site construction.

Although one aspect of the above-mentioned embodiment has been explained by taking the construction of an MS tunnel room/section as an example, the present invention can also be applied to other sections of folding force equipment.

〔Effect of the invention〕

As explained above, the present invention involves assembling piping, valves, and pedestals into a unit in advance, and after constructing the floor and walls of a reactor building, carrying the unit into the building and attaching the pedestal. Next, between the wall and the pedestal, a partition plate that is supported only by the wall and the pedestal and forms a part of the ceiling (1'4) is placed, and then the ceiling 111!1 construction and unit work are carried out.
Since we are trying to do the fil+ construction in parallel, we will perform 1 eyebrow 1 on the machine side after the building construction is completed.
Moreover, compared to the conventional construction method in which the machine side was assembled on site, the construction period can be shortened to 1f':A, and the number of man-hours can also be reduced. Since the cutting machine side is unitized, quality is more stable compared to on-site construction (m9't
i-ness can be improved.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the position of the MS) tunnel room in the reactor building, Figure 2 is an enlarged sectional view taken along line t+-n in Figure 1,
Fig. 3 is a view taken along the If-I line in Fig. 12, Figs. A process diagram showing an example of the construction method according to the invention, FIGS. 2 to 1/FIG. are explanatory diagrams showing an embodiment of the present invention in the order of steps, and FIG. Figure, Figure 3 is 7.2
The X1ll-XusiI cross-sectional view in the figure, Figure 1q is the
It is a sectional view taken along the line XIV-XIV of the diagram.゛ l...MS) channel room, co...reactor building, 3...
・PCV, i=s W, A a-M S second valve, A
``D-・-FDW 2nd valve, 7...Common mount, ga・MS
3rd valve, g'b-FDW a) 3rd valve, wa piping, /l-
Piping anchor, J unit, 2/a, 21b
-・Support silver material 1.2.2 deck plate. Applicant's agent Inomata Seishin 12 Bacteria 13] 14th Bacterium

Claims (1)

[Scope of Claims] / In a method for constructing the floor and walls of a reactor building, and then constructing the ceiling of the reactor building and constructing the pipes, valves, and frames for the pipes and valves disposed inside the building, , the valve and the pedestal are assembled together in advance to form a unit, and after constructing the floor and walls of the reactor building, the unit is carried into the building and the pedestal is installed, and then between the wall and the pedestal, This is a patented construction method for nuclear power facilities that involves arranging partition plates that are supported only by walls and frames and forming the fill-in formwork for the ceiling, and then carrying out work on the ceiling side and the unit side in parallel. 2. A patent claim characterized in that it is applied to the construction work of a main steam pipe tunnel room adjacent to the biological shielding wall surrounding the reactor containment vessel, and the installation work of piping arranged in the main steam pipe tunnel room and its frame. What is the range of the power equipment mentioned in the / section?
Ia construction method.