JPH011862A - Concrete pouring method for partition floor of concrete containment vessel - 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 [Industrial Field of Application] The present invention relates to an improvement in a method for pouring concrete for a partition floor of a concrete containment vessel for a nuclear reactor.

[Conventional technology]

Conventionally, related to this type of technology, Japanese Patent Application Laid-Open No. 57-96173 and Japanese Patent Application Laid-Open No. 61-78958 have been proposed.
is being carried out.

Figures 2 and 3 show the conventional partition floor concrete placement method for a concrete containment vessel, Figure 2 (a) is an explanatory diagram, (b) is a right side view of the temporary support part of (a),
FIG. 3 is a detailed view of section A in FIG. 2(a). In the figure, 2 is a concrete containment vessel, 3 is a partition floor, 4 is an upper chamber of the containment vessel, 5 is a lower chamber of the containment vessel, 6 is a central mat, and 7
8 is a bottom liner, 8 is a side liner, 9 is a reactor pressure vessel pedestal, 10 is a partition floor bottom liner, and 11 is a vent pipe. Further, 15 is a metal alloy, 25 is a base, 26 is a place, 27 is a temporary support, 28 is a support bracket,
29 is a temporary beam, and 30 is a reinforcing bar.

The lower chamber 5 of the containment vessel has a central matsutro on the bottom lined with a bottom liner 7, a concrete containment vessel 2 on the outer peripheral wall with a side liner 8, and a lower surface of the partition floor 3 of the concrete ring with a liner 10 on the lower side of the partition floor. It is lined with. In addition, the inner peripheral wall portion is the reactor pressure vessel pedestal 9. A vent pipe 11 is installed in the lower chamber 5 of the containment vessel.
is constructed in an airtight manner. During the concrete pouring work for the partition floor 3, the reactor pressure vessel pedestal 9 and bottom liner 7 are installed (hereinafter referred to as setting).
At the same time, the base 2 buried in the central Matsutoro part
5, a temporary support 27 reinforced by a place 26 was set to support the lower part of the temporary beam 29. In addition, at this stage, after setting the side liner 8 of the concrete containment vessel 2, which has already been set, the interlocking alloy 15 that will be the joint between the partition floor lower liner 10 and the side liner 8 is added.
In parallel with this, a temporary support bracket 28 was set on the reactor pressure vessel pedestal 9, and the temporary support bracket 28 and the temporary support 27 supported the temporary beam 29.

In this way, the weight (load) of the partition floor 3 portion during concrete pouring work for the partition floor 3 is controlled by the temporary support 27. After constructing it so that it could be supported by temporary materials such as temporary beams 29, concrete pouring work for the partition floor 3 was carried out. after that,
After the concrete poured on the partition floor 3 hardens over time and gains strength, temporary supports 27. Place 26° Temporary materials such as temporary beam 29 were being removed.

Therefore, when placing concrete for the partition floor 3, in the past, temporary supports reinforced by places 26 were used to prevent deformation of the partition floor lower liner 10 due to the load during concrete placement and to support the load during concrete placement. 27. Support bracket 28. There is a drawback that temporary materials such as the temporary beam 29 are required, and the number of man-hours required for attaching and removing these materials and the period required for this construction work are disadvantageous.

[Problem that the invention seeks to solve]

In the above conventional technology, temporary materials such as temporary beams and temporary supports are required to support the weight of the partition floor 3 when concrete is poured, and water is poured into the lower chamber of the containment vessel. No consideration was given to utilizing the incompressibility of the filled water to support it, and as a result, there were problems in that it required many man-hours to attach and detach temporary materials and lengthened the construction period.

The present invention was developed in view of the above circumstances, and can significantly reduce the amount of temporary materials required to support the weight of the partition floor during concrete pouring, improve economic efficiency, and significantly reduce the number of work hours and work period. The purpose of this invention is to provide a method for concrete-casting a partition floor of a concrete containment vessel.

[Means for solving problems]

The above purpose is to form a concrete containment vessel whose bottom is formed by a central mat lined with a bottom liner, whose outer circumferential wall is lined with side liners, whose partition floor at the ceiling is lined with a partition floor bottom liner, and whose inner circumferential wall is pressure-sensitive. A lower chamber of the containment vessel, which is formed by a vessel pedicle and a vent pipe and is configured in an airtight manner, is arranged on the outer periphery of the lower part of the reactor pressure vessel, which is disposed in the upper part of the inside of the concrete containment vessel, and is located at the lower part of the containment vessel. In a method for placing concrete for a partition floor that separates a chamber from an upper chamber of the containment vessel above the lower chamber of the containment vessel, the concreting of the partition floor is performed by filling the lower chamber of the containment vessel with water and making it incompressible. Partition floor concreting for a concrete containment vessel where concrete is cast while supporting the lower part of the liner on the lower surface of the partition floor with water, and when the concrete hardens and the concrete strength is developed, the water in the lower chamber of the containment vessel is drained. This is accomplished by a method.

[Effect]

As described in the description of the embodiment below, the water supply gate valve 20 is opened and water is filled into the lower chamber 5 of the containment vessel by the water supply pump 19 via the water supply and drainage pipe F. Water is incompressible and the lower surface of the partition floor underside liner 10 is sufficient to support the large weight of the upper portion. In this state, concrete is poured for the partition floor 3, and when the concrete hardens and gains strength, the gate valve 24 for draining the water in the lower chamber 5 of the containment vessel is opened and the drain pump 23 is driven. Drain. Therefore, the work of maintaining the strength of supporting the partition floor 3 from below during concrete pouring of the partition floor 3 is extremely simple, and the number of work steps can be significantly reduced.

〔Example〕

Hereinafter, the method for pouring concrete for a partition floor of a concrete containment vessel according to the present invention will be described with reference to FIG.

FIG. 1 is a longitudinal sectional view of the partition floor portion. In the figure, 1
12 is a reactor pressure vessel, 12 is a vent pipe blow-off nozzle, 13 is an airtight door, 14 is an access hatch for maintenance, 15 is a connecting alloy, 16 is a closing plate, 17 is a water supply and drainage pipe, 18 is a pipe for confirming full water, 19 is a water supply pump, and 20 is a water supply gate valve.

21 is a gate valve, 22 is a piping sleeve, 23 is a drainage pump, and 24 is a drainage gate valve. The reactor pressure vessel 1 is housed in the upper center of the concrete containment vessel 2. Further, on the upper surface of the partition floor 3 at the top of the lower containment vessel chamber 5 disposed on the lower side of the outer periphery of the concrete containment vessel 2, there is formed an upper containment vessel chamber 4 which is a storage area for equipment inside the concrete containment vessel. A lower containment vessel chamber 5 separated by a partition floor 3 is provided for the purpose of suppressing the pressure inside the concrete containment vessel 2. The inside of the lower chamber 5 of the containment vessel communicates with the outside through a vent pipe 11° and a vent pipe blow-off nozzle 12, and is provided with a maintenance access hatch 14 having an airtight door 13.

In the case of concrete pouring for partition floor 3, first,
After constructing the central matsutoro, the steel nuclear pressure vessel pedestal 9 and floor liner 7 are set, the side liner 8 and the interlocking alloy 5 are set, and the side wall (outer peripheral wall) of the concrete containment vessel 2 is constructed. . Next, the partition floor lower liner 10, which also serves as a formwork for concrete execution of the partition floor 3, is welded to the joint alloy 15 provided on the upper part of the side liner 8 and the nuclear pressure vessel pedestal 9. Further, the lower end opening of the water supply and drainage pipe 17 that penetrates the partition floor liner 10 from the side of the upper chamber 4 of the containment vessel and communicates with the outside of the concrete containment vessel 2 is opened into the lower chamber 5 of the containment vessel. - On the other hand, a temporary closing plate 16 is sealed and attached in advance to the end of the vent pipe blow-off nozzle 12 of the reactor pressure vessel pedestal 9 by a method such as temporary welding, and the maintenance access hatch 14 is sealed with an airtight door 13. do.

After the inside of the lower chamber S of the containment vessel is made into an airtight closed space as described above, the inside is filled with water, which is an incompressible fluid. In this case, the water supply gate valve 20 is opened and the water supply pump 19 supplies water into the containment vessel lower chamber 5 through the water supply and drainage pipe 17. It can be confirmed that the lower chamber 5 of the containment vessel is filled with water by overflowing from the water-filled confirmation pipe 18 that opens at the top of the partition floor 3. By closing the gate valve 21, water is sealed in the space inside the lower chamber 5 of the containment vessel.

After this condition is established, concrete for the partition floor 3 is poured using the partition floor lower liner 10 as a formwork. in this case,
Since the space inside the lower chamber 5 of the containment vessel is sealed with incompressible water, it can sufficiently support the weight of the partition floor 3, and even if concrete is poured on the partition floor 3, the liner at the bottom of the partition floor cannot 1o can sufficiently support the load without deforming. After a predetermined period of time has elapsed after the concrete has been placed and the concrete has solidified and developed strength, the gate valve 21. The drainage gate valve 24 is opened and the drainage pump 23 is driven to drain water.

Also, a closing plate 1 attached to the vent pipe blow-off nozzle 12 is provided.
6 is removed. The water supply and drainage pipe 17 is cut and removed except for the part installed in the concrete of the partition floor 3, and the holes created by the water supply and drainage pipe F embedded in the concrete of the partition floor 3 and the water-filled confirmation pipe 18 are closed. do. Therefore, there is no need for temporary materials to support the weight of the partition floor 3 as in the prior art, and only temporary materials for supplying and discharging water to the lower chamber 5 of the pressure vessel are sufficient. Furthermore, the number of man-hours and period required for attaching and detaching temporary materials can be significantly reduced.

In this way, in the method of concrete pouring of the partition floor of a concrete containment vessel according to this embodiment, in order to support the weight of the partition floor, the lower part of the pressure vessel is Since the room is filled with water to support the weight of the partition floor, there is no need for the large number of temporary materials used in the past, and only a small amount of material for filling water and supplying and discharging it is sufficient, making it extremely economical. You can improve.

Furthermore, since it only allows water to be supplied and discharged.

The man-hours and work period for attaching and detaching temporary materials can be significantly reduced.

〔Effect of the invention〕

As described above, according to the concrete pouring method for partition floors of concrete containment vessels of the present invention, the amount of temporary materials required to support the weight of the partition floors during concrete pouring can be significantly reduced, improving economic efficiency. This has the effect of significantly reducing the number of man-hours and period of work.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of the partition floor portion when the method of placing concrete for a partition floor of a concrete containment vessel according to the present invention is implemented, and Fig. 2 (a) is a conventional method for placing concrete for a partition floor of a concrete containment vessel. Explanatory drawings during implementation, (B) is a right side view of the temporary support part in (A), and Figure 3 is A in Figure 2 (A).
FIG. 1... Reactor pressure vessel, 2... Containment vessel made of concrete, 3... Partition floor, 4... Upper chamber of containment vessel, 5...
Containment vessel lower chamber, 6... Central mat, 7... Bottom liner, 8... Side liner, 9... Pressure vessel pedestal, 10... Partition floor bottom liner, 11... Vent pipe.

Claims (1)

[Claims] 1. The bottom is formed by a central mat lined with a bottom liner, the outer peripheral wall is formed by a concrete containment vessel lined with side liners, the partition floor at the ceiling is lined with a partition floor bottom liner, and the inner peripheral wall is a pressure vessel pedestal. A lower chamber of the containment vessel, which is formed by a vent pipe and configured in an airtight manner, is disposed on the outer periphery of the lower part of the reactor pressure vessel disposed at the upper inner side of the concrete containment vessel, and is connected to the lower chamber of the containment vessel. In a method for concrete pouring of a partition floor that separates the upper chamber of the lower chamber of the containment vessel from the upper chamber of the containment vessel, the concreting of the partition floor is performed by filling the lower chamber of the containment vessel with water and using the incompressible water. Partition floor concrete for a concrete containment vessel, characterized in that concrete is cast while supporting the lower part of the liner on the lower surface of the partition floor, and the water in the lower chamber of the containment vessel is drained at the stage when the concrete hardens and develops concrete strength. Pouring method.