JPS6156474B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for the top floor of a nuclear reactor building in a nuclear power plant.

The conventional construction method for the top floor of a nuclear reactor building is as shown in Figures 1 to 4.
The operation floor surface 3 of the reactor building 2, which houses the reactor containment vessel A and the reactor pressure vessel B, is poured and cured with concrete, and after this curing period, the operation floor surface 3 is covered with concrete. Using a carry-in device (not shown), the gigantic pressure vessel B is installed on the pressure vessel foundation 2a. On the other hand, a roof steel structure 5 is constructed of each steel support column 4 and truss 5a provided with a gutter rail 4a on the operation floor 3.
Build. Next, as shown in FIG. 3 and FIG.
Stack it up to the top of a.

Then, using this temporary scaffolding 6, concrete is poured between each of the steel supports 4 to construct the steel concrete 6 and concrete side wall 7,
Furthermore, using the temporary scaffolding 8, the truss 5
The roof steel structure 5 is constructed by pouring concrete on the upper surface of the roof, and then the temporary scaffolding 8 is dismantled and removed. Thus, an installation space for the overhead traveling crane 10 is secured on the top floor 9 where the operation floor 3 is located. In this way, it is finally possible to assemble and adjust the overhead crane 10 so that it can run on the girder rail 4a.

In addition, during the assembly work of the overhead traveling crane 10, since a material entrance is provided in a part of the roof steel structure 5, after the assembly of the overhead traveling crane 10 is completed, it is necessary to close the material entrance. It's getting old.

However, in the above-described conventional construction method for the top floor of the reactor building, the operation floor 3 of the reactor building 2 is completed by pouring and curing, and the steel concrete columns 6, concrete side walls 7 and concrete side walls 7 of the top floor are completed. For the procedure (process) of constructing the roof steel frame structure 5 and, after a certain curing period has elapsed, dismantling and removing the temporary scaffolding 8 installed for construction work across the entire inner peripheral wall of the top floor 9, Overhead crane 1
0 installation, assembly, and adjustment time will be significantly delayed. Furthermore, since a material entrance is provided in the roof steel frame structure 5 for carrying in the overhead traveling crane, the time required for closing the temporary opening will be delayed after the overhead traveling crane 10 is brought in. Furthermore, installation work for various structures, piping, wiring, etc. of the reactor itself will be delayed, resulting in longer construction times for nuclear power plants and correspondingly delayed delivery dates for nuclear power plants.

Furthermore, in the conventional construction method for the top floor of a nuclear reactor building, the effective working area of the operation floor 3 is narrowly limited by installing temporary scaffolding 8 along the entire perimeter wall on the operation floor 3. As a result, the efficiency of various construction work decreases, and over a long period of time,
Since temporary scaffolding 8 has been installed, this will affect the construction work.

On the other hand, the construction work of the steel concrete columns 6, the concrete side walls 7, and the roof steel structure 5 on the top floor 9 is work at high places, so it takes a long time to take into consideration the delivery of materials and other construction work. This poses a problem from a safety point of view. In particular, the operating timing of the above-mentioned overhead traveling crane 10 is a critical path in the entire construction process of a nuclear power plant, so if the above-mentioned operating timing is delayed, other construction periods will be significantly delayed. There are some difficulties.

In order to solve the above-mentioned difficulties, the present invention allows the construction work of the roof steel frame structure and the overhead traveling crane to be carried out simultaneously and in parallel after the construction of the steel concrete columns and the concrete side walls, and furthermore, the first temporary scaffolding is To provide a construction method for a nuclear reactor building, which aims to significantly shorten the construction period and achieve early delivery by removing the reactor building and widening the operating floor surface.

Hereinafter, the present invention will be described with reference to an illustrated embodiment. It should be noted that the present invention will be described with the same reference numerals attached to the same components as those of the embodiments described above.

In FIGS. 5 to 7, reference numeral 1 is a bedrock in a nuclear power plant, and this bedrock 1 is covered with concrete up to the operation floor 3 of the reactor building 2 that houses the containment vessel A and pressure vessel B. Pour and cure. After this curing period has passed, the huge pressure vessel B is installed on the pressure vessel foundation 2a from the operation floor 3 using a carrying device (not shown). On the other hand,
On the operation floor surface 3, each steel support column 4 provided with a girder rail 4a and a truss 5a constituting the skeleton of the roof steel structure 5 are constructed.

Next, as shown in FIGS. 5 and 6, a first temporary scaffolding 8a is stacked on the outer periphery of the operation floor 3 up to the bottom of the truss 5a. After that, each of the steel supports 4 is installed using the first temporary scaffolding 8a.
Concrete is poured around and between each steel frame support 4 to construct a steel concrete support 6 and a concrete side wall 7, respectively. In this case, the reinforcing bars 7a are also buried at the same time as the formwork for concrete placement is installed and removed.

Thereafter, the first temporary scaffolding 8a is dismantled and removed to secure an installation space for the overhead traveling crane 10. That is, the operation floor surface 3 of the uppermost floor 9 formed below the truss 5a can be used entirely.

Next, assembly and adjustment of the overhead traveling crane 10 on the girder rail 4a provided in the middle of the steel-framed concrete column 6 begins.

On the other hand, a part of the truss 5a is provided with shaped steel beams 11,1.
Install 2 in parallel. However, this type steel beam 11, 12
Scaffolding board 8c of second temporary scaffolding 8b is laid on top of this. Thereafter, the second temporary scaffold 8b is stacked so as to protrude above the truss 5a, as shown in FIG. Next, the second temporary scaffolding 8
b is used to pour concrete around the outside of the truss 5a, around each of the remaining steel columns 4, and between each of the remaining steel columns 4 to form the roof steel structure 5, the remaining steel concrete columns 6, and concrete. Build the side wall 7 (see Figure 6). In this way,
At the final stage, by dismantling and removing the second temporary scaffolding 8b, the construction of the top floor of the reactor building and the assembly of the overhead traveling crane 10 can be carried out simultaneously and in parallel.

As described above, according to the present invention, after constructing the steel concrete support column 6 and the concrete side wall 7, the roof steel structure 5 and the overhead traveling crane 1 are assembled.
0 in parallel, so
Not only can construction time be significantly shortened, but work safety can also be improved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the reactor building to explain the conventional construction method for the reactor building, Figure 2 is an enlarged cross-sectional view showing a part of the roof steel structure of the reactor building, and Figure 3 is a cross-sectional view of the reactor building. is an enlarged sectional view of chain circle A in Figure 2,
FIG. 4 is an enlarged plan view taken along the chain line B-B in FIG. 3, FIG.
The figure is an enlarged sectional view of chain circle C in FIG. 5, and FIG. 7 is a plan view of the same. 2...Reactor building, 3...Operation floor, 4...
... Steel support column, 5 ... Roof steel structure, 5a ... Truss, 6 ... Steel concrete support column, 7 ... Concrete side wall, 8 ... Temporary scaffolding, 8a ... First temporary scaffolding, 8b ... Second temporary scaffolding Scaffolding, 10...overhead crane, 11, 12...shaped steel beam.

Claims (1)

[Claims] 1. A roof steel structure consisting of each steel support and truss is constructed in advance above the operating floor of the reactor building, and then a first temporary scaffold is placed on the operating floor above the truss. The first temporary scaffolding is then used to pour concrete between each of the above steel supports to construct the steel concrete supports and concrete side walls, after which the first temporary scaffolding is dismantled and removed. The installation space for the overhead traveling crane was secured using A second temporary scaffold is placed on this shaped steel beam so as to protrude above the truss, and concrete is poured between the steel supports and on the truss using this second temporary scaffold to form steel concrete. A method for constructing a nuclear reactor building, comprising constructing columns, concrete side walls, and a roof steel structure, and then dismantling and removing the second temporary scaffolding.