JPH0652311B2 - Construction method of reinforced concrete reactor containment vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a reinforced concrete reactor containment vessel integrated with a reactor building, and in particular, can be constructed independently of the reactor building, The present invention relates to a construction method for a reinforced concrete reactor containment vessel suitable for shortening the construction period of the entire nuclear power plant.

[Conventional technology]

In a boiling water reactor, that is, BWR, etc., a reactor containment vessel is installed for the purpose of preventing radioactive steam emitted from the reactor pressure vessel from leaking to the surrounding environment in the event of a coolant loss accident. The reactor containment vessel is located inside the nuclear building. This reactor containment vessel includes a self-supporting steel containment vessel and a reinforced concrete containment vessel.

The reinforced concrete reactor containment vessel has a structure in which a reinforced concrete wall doubles as a wall of the reactor building in order to flow the load to the reactor building and simplify the structure, and is integrated with the reactor building. Therefore, in the conventional construction method of a reinforced concrete reactor containment vessel, the reactor containment vessel was not constructed separately from the reactor building but was started up in parallel with the reactor building.

This will now be described with reference to the drawings. FIG. 4 is a longitudinal sectional view of a BWR reactor building using a reinforced concrete reactor containment vessel, and the reactor building is designated by reference numeral 1. Reactor building 1 is equipped with floor slab 2
A reactor containment vessel 3 is arranged inside the. A reactor pressure vessel 5 supported by a pedestal 4 is installed in the reactor containment vessel 3, and a diaphragm floor 6 is provided around the reactor pressure vessel 5.

At a joint A between the reinforced concrete reactor containment vessel 3 and the reactor building floor slab 2, as shown in an enlarged view in FIG. 5, the reinforcing bar 7 of the reactor containment vessel 3 extends to the floor slab 2 of the reactor building. And it is arranged. Inside the reactor containment vessel 3, a steel liner plate 8 is lined to ensure airtightness.

BW using this reinforced concrete reactor containment vessel 3
At R, the load of the reactor containment vessel 3 is set to the reactor building 1
In order to streamline the structure of the reactor containment vessel 3,
The reactor containment vessel 3 and the reactor building 1 are integrated via a floor slab 2 of the reactor building. Therefore, the reinforcing bar 7 in the reactor containment vessel 3 is extended into the floor slab 2 of the reactor building as described above, and is joined to the reinforcing bar of the floor slab 2.

Therefore, when constructing a reinforced concrete reactor containment vessel 3, the reactor containment vessel 3 or the reactor building 1
Each time the floor slab 2 is built up to the height at which it is located, the floor slab 2 and other parts of the reactor building 1 up to that height are constructed, and this is done until the start-up of the reactor containment vessel 3 is completed. Repeatedly, the reactor containment vessel 3 was started up in parallel with the reactor building 1 in this way.

Note that Japanese Patent Application No. 61-12653, for example, is related to the construction method of the reinforced concrete reactor containment vessel.

[Problems to be solved by the invention]

As described above, in the conventional construction method for a reinforced concrete reactor containment vessel, in order to start up the reactor containment vessel 3, at the same time, the reactor building 1 must be started up in parallel. Therefore, the construction process of the reinforced concrete reactor containment vessel is related to the process required to start up the entire reactor building, and there is a problem that the construction of the reactor containment vessel takes a very long time.

The reactor containment vessel construction process is a critical path in the overall nuclear power plant construction process. For this reason, the length of the construction period of the reactor containment vessel directly affects the construction period of the entire nuclear power plant, and the construction period of the reactor containment vessel is prolonged. It means to prolong.

Therefore, an object of the present invention is to provide a method for constructing a reinforced concrete reactor containment vessel that can shorten the construction period for a reinforced concrete reactor containment vessel.

[Means for solving problems]

The purpose of the above is to provide a screw rebar coupler at one end of the threaded rebar so that the screw rebar coupler is located near the outer surface of the reactor containment vessel at the joint between the reactor containment vessel and the floor slab of the reactor building. Arranging the threaded rebar, and after constructing the reactor building by connecting the floor slab rebar of the reactor building to the screw rebar coupler after launching the reactor containment vessel by placing concrete in this state, This is accomplished by a construction method of a reinforced concrete reactor containment vessel, characterized in that, at the time of starting up the reactor containment vessel, a slip form for moving a formwork upward and placing concrete is applied.

[Action]

Start up the reactor containment vessel so that the screw rebar coupler is located near the outer surface of the reactor containment vessel, and then connect the rebar of the floor slab of the reactor building to the screw rebar coupler. The reactor containment vessel can be started up independently from the reactor building by constructing the reactor building and constructing it with the reactor containment vessel that was started up earlier, thus shortening the construction period of the reactor containment vessel. it can. Further, by applying a slip foam that moves the formwork upward when the reactor containment vessel is started up, the construction period of the reactor containment vessel can be further shortened. Therefore, the construction period of the entire nuclear power plant can be shortened.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a state before a floor slab is joined at a joint portion of a reinforced concrete reactor containment vessel constructed by a construction method according to an embodiment of the present invention with a reactor building floor slab, and FIG. It is a figure which shows the state after joining of a floor slab, and this joining part is a part corresponding to the joining part A shown in FIG. 4 mentioned above. In the figure, the same members as those shown in FIGS. 4 and 5 are designated by the same reference numerals.

In the construction method of the reinforcing bar tencrete reactor containment vessel 3 of the present embodiment, a threaded reinforcing bar 11 is used as a reinforcing bar to be joined to the floor slab reinforcing bar 10 of the reactor building 1, and a screw reinforcing bar coupler 12 is provided at one end thereof. Connecting. As shown in FIG. 1, the screw rebar coupler 12 is installed so that one end thereof is exposed flush with the concrete surface of the reactor containment vessel 3. Next, the form is installed by the slip-form method of moving the form upward, concrete is poured, and the storage container 3 is started up. The start-up of the containment vessel 3 is performed independently of the construction of the reactor building 1 and its floor slab 2 and before that.

In order to construct the floor slab 2 of the reactor building 1 after the reactor containment vessel 3 is started up, a threaded reinforcing bar is used as the reinforcing bar 10 of the floor slab 2, and the threaded reinforcing bar 10 is stored in the reactor. The floor slab 2 is laid out by connecting it to the screw rebar coupler 12 exposed on the concrete surface of the container and projecting the rebar 10 integrated with the rebar 11 of the reactor containment vessel 3 from the concrete surface. Next, the concrete of the floor slab 2 is poured, and the reactor building 1 is started up while constructing the other parts of the reactor building 1.

Therefore, in the construction method of this embodiment, after the reinforced concrete containment vessel 3 is started up, the reactor building 1 is constructed and integrated with the reactor containment vessel 3, so that the construction of the reinforced concrete reactor containment vessel 3 is carried out. It can be carried out independently of the reactor building 1, and the construction period of the reactor containment vessel can be shortened. Therefore, the construction period of the entire nuclear power plant where the reactor containment vessel 3 is used as a critical path can be shortened.

Further, in the construction method of the present embodiment, since the reinforcing bars 11 do not project from the surface of the reactor containment vessel 3, the concrete pouring process by applying slip foam at the time of constructing the reactor containment vessel 3 is easy. From this point as well, the construction period of the reactor containment vessel can be shortened.

That is, as described above, the reason why the reinforced concrete reactor containment vessel 3 and the reactor building 1 are integrated is to flow the load applied to the reactor containment vessel 3 to the reactor building 1. Reactor containment vessel 3 and reactor building floor slab 2
It is necessary to join the rebar inside. For this reason, when the reinforced concrete reactor containment vessel 3 is independently started up by the conventional construction method and then the floor slab 2 of the reactor building is to be placed, as shown in FIG. Building 1
It is necessary to project the reinforcing bar 7 joined to the reinforcing bar in the floor slab 2 of the above from the surface of the reactor containment vessel 3 to the outside.

However, in this case, when the concrete of the reactor containment vessel 3 is poured, the reinforcing bars 7 protruding to the outside become an obstacle, and it becomes difficult to install the formwork 13.

In addition, at the time of construction of a reinforced concrete reactor containment vessel, we will try to shorten the construction period by applying the so-called slip-form method in which the formwork is installed over the entire circumference of the containment vessel and gradually raised. However, if the reinforcing bar is protruding, this method cannot be used.

In the construction method of this embodiment, since the reinforcing bars do not project outside the surface of the reactor containment vessel 3 as described above, there is no obstacle to the installation of the formwork, and the formwork can be moved upward. it can. Therefore, it becomes possible to install slip forms by applying slip forms. Therefore, also from this, the construction period of the reactor containment vessel can be significantly shortened.

〔The invention's effect〕

As is clear from the above, according to the method for constructing a reinforced concrete reactor containment vessel of the present invention, since the reactor containment vessel is started up independently of the reactor building using slip foam, the construction period for the reactor containment vessel Since the reactor containment vessel is a critical path for the entire nuclear power plant construction process, the entire nuclear power plant construction process can also be shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state before a floor slab is joined at a joint portion of a reinforced concrete reactor containment vessel constructed by a construction method according to an embodiment of the present invention with a reactor building floor slab. FIG. 3 is a vertical cross-sectional view showing a state after floor slab joining of the same joint portion, and FIG. 3 is a vertical cross-sectional view showing a reactor containment vessel construction situation when the present invention is not used,
FIG. 4 is a vertical sectional view of the entire BWR reactor building in which a reinforced concrete reactor containment vessel is arranged, and FIG. 5 is an enlarged view of a portion A in FIG. DESCRIPTION OF SYMBOLS 1 ... Reactor building, 2 ... Floor slab 3 ... Reinforced concrete reactor containment vessel 10 ... Floor slab rebar 11 ... Reactor containment rebar 12 ... Screw rebar coupler

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Koichi Saito, 3-1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Ltd., Hitachi Plant (72) Inventor, Minoru Masuda, 3-chome, Hitachi City, Ibaraki Prefecture No. 1 No. 1 in Hitachi Works, Hitachi Ltd. (56) References JP-A-57-179694 (JP, A)

Claims (1)

[Claims] 1. A method for constructing a reinforced concrete reactor containment vessel integrally formed with a reactor building, wherein a threaded rebar coupler is provided at one end of a threaded rebar, and the threaded rebar coupler is the reactor containment vessel and the reactor building. The threaded rebar is placed so that it is located near the outer surface of the reactor containment at the joint with the floor slab, and concrete is placed in this state to start up the reactor containment and then the threaded rebar A slip form is applied to connect the floor slab reinforcement of the reactor building to the coupler to build the reactor building, and at the time of starting up the reactor containment vessel, move the formwork upward to place concrete. A construction method for a reinforced concrete reactor containment vessel characterized by the above.