JPS6326211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a nuclear reactor building, and particularly to a method of constructing formwork for a concrete frame for construction work.

As shown in FIG. 1, the reactor building 1 is composed of many walls 2, floors 3, and beams 4, and construction work is progressed sequentially from the lower floors to the upper floors.

On the top floor, as shown in Fig. 2, concrete is poured for the operation floor 5, steel columns 6 are constructed, and the roof steel structure 7 is set, and the walls 8, ceiling beams 9, etc., are reinforced with concrete, etc. Concrete pouring work will be carried out.

After these operations, the overhead traveling crane 10, which is the most important equipment in nuclear power plant construction, is mounted on the traveling girder 11 and installed.

The outline of the construction method for the reactor building is as described above, but to explain the details of the conventional method especially for the top floor, after pouring concrete for the operation floor 5, the steel columns 6 are constructed as shown in FIG. (3rd
The figure shows the steel columns surrounded by concrete. ), the roof steel frame structure 7 is arranged on the steel frame columns 6, and set and installed using connecting members 12 made of steel plates and special tightening bolts.

After the steel structure 7 is properly installed in this way, reinforcing bars are assembled around the steel columns 6, walls 8, and ceiling beams 9, and then temporary scaffolding 1 is installed from the operation floor 5.
3 is constructed, and this scaffolding is used to set up the wooden formwork 14 for concrete pouring, the temporary steel pipes 15 that support it, and the shoring 16.

Next, concrete is poured into the wooden formwork 14, and after a necessary curing period, the formwork 14 is poured.
and shoring 16 will be removed, and temporary scaffolding 13 will be dismantled.

These demolition steps are carried out in the order of the surrounding steel columns 6, walls 8, and ceiling beams 9. After the construction work on the ceiling beams 9 is completed and the temporary scaffolding 13 is dismantled, the second
As shown in the figure, the overhead traveling crane 10 is mounted on a tower at a predetermined position, an assembly test is performed, and it is put into operation.

The conventional method of constructing a nuclear reactor building is as described above, but this method has the following drawbacks.

That is, in the conventional method, in order to set up and support the wooden formwork 14, the temporary scaffolding 13 must be erected until the concrete has finished curing, so the overhead traveling crane 10 cannot be mounted on the tower until it is dismantled. Moreover, the construction work starts from the top of the reactor building, which is the slowest, and the start of operation of the overhead traveling crane 10 is inevitably delayed.

As a result of the delay in starting the crane operation, the installation work of the internal reactor structures may be delayed, which may seriously impede the construction process of the nuclear power plant.

In addition, by setting up temporary scaffolding all around the operating floor along the wall, the effective working area of the operating operating floor becomes narrower, and the temporary scaffolding must be kept in place for a long period of time. , which will affect other construction processes.

Furthermore, the construction of walls, columns, ceiling beams, and roof steel structures requires work at heights, and construction must proceed over a long period of time in parallel vertically with other work on the operating floor. Coordinating encounters becomes complicated,
There are also problems from a safety point of view.

For these reasons, the operating period of the overhead traveling crane is a critical path in the overall construction process of a nuclear power plant, and is the biggest reason for the long overall construction period.

The present invention was made in view of the above circumstances, and
The objective is to obtain a construction method for a nuclear reactor building that significantly shortens the construction period, reduces costs, and improves work safety and efficiency.

A feature of the present invention is that the formwork necessary for concrete pouring is made of steel plates, the steel plate formwork is fixed to the form steel of the ceiling beam of the building frame via suspension support members, and the form steel with the steel plate formwork is attached to the steel frame. By setting and fixing the formwork between the pillars and then embedding it directly into the concrete structure, it is possible to eliminate the need for shoring and temporary scaffolding to support the formwork.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in the drawings.

In the present invention, after pouring concrete for the operation floor as in the past, the H-shaped steel 17 of the steel column 6 is constructed as shown in FIGS. 4 and 5.

An iron plate form 19 is attached to the H-beam 18 of the ceiling beam 9 in advance with a hanging support member 20 made of steel or the like.

The H-shaped steel 18 with the steel plate formwork 19 assembled in this way is set and fixed between the H-shaped steel 17 of the steel column 6, and the roof steel structure 7 is installed using the connecting member 12.

Once these steel structures have been set and fixed, reinforcing bars within the steel columns 6 and walls 8 are constructed using temporary scaffolding constructed from the operation floor as usual.

In addition, in parallel with this, reinforcing bars for the ceiling beam 9 are constructed from the upper steel. Next, concrete is poured, but with the method of the present invention, there is no need for shoring as in the conventional method.
Since concrete can be poured within the steel plate formwork, the temporary scaffolding will be dismantled and removed immediately after the concrete for the steel columns and walls has been poured to the bottom of the ceiling beams.

As described above, in the reactor building construction method according to the present invention, the formwork for the ceiling beam section at the top of the reactor building, which is the latest to be constructed, can be constructed without temporary scaffolding or shoring. After the concrete work is completed, the temporary scaffolding can be dismantled and removed immediately, and furthermore, there is no need to assemble and dismantle the support and formwork for the ceiling beams, making it easier to mount and operate the overhead crane. You can start earlier.

Therefore, by using this overhead traveling crane, the internal reactor structures can be installed efficiently, and the overall construction period for nuclear power plant construction can be significantly shortened.

In addition, since the temporary scaffolding can be removed quickly, the effective working area of the operation floor can be secured, and safety is improved by reducing work encounter coordination and up-and-down work, and reducing the need for work at heights. Significant.

Moreover, since there is no need to assemble or disassemble the shoring of the beam or the formwork, it can significantly contribute to cost reduction.

As described above, according to the present invention, by combining the various effects described above, it is possible to significantly shorten the construction period of a nuclear power plant and save costs.

In the above description, the present invention has been described with reference to its embodiments, but the present invention is not limited to these specific embodiments, and can be modified and modified in many ways without departing from the spirit of the present invention. Of course.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing an example of the overall structure of the reactor building, Figure 2 is a vertical cross-sectional view of the top floor of the reactor building shown in the frame of Figure 1, and Figure 3 is a diagram explaining the conventional method. FIG. 4 is a perspective view of the ceiling beam shown in the frame of FIG. 2, looking up from below; FIG. The figure is a longitudinal sectional view taken along the - line in FIG. 4. 1... Reactor building, 2... Wall, 3... Floor, 4...
...Beam, 5...Operation floor, 6...Steel column, 7...
...Roof steel structure, 8...Wall (top floor), 9...
Ceiling beam, 10... Overhead traveling crane, 11... Traveling girder, 12... Connecting member, 13... Temporary scaffolding, 14... Wooden formwork, 15... Temporary steel pipe (for formwork support), 16... Shoring (for formwork support), 17...
...H type steel (steel column), 18...H type steel (ceiling beam),
19... Steel plate formwork, 20... Steel plate formwork suspension support member.

Claims (1)

[Scope of Claims] 1. A steel plate form used for pouring concrete in a reactor building is fixed to a form steel of a ceiling beam of a building frame via a suspension support member, and the form steel with the steel plate form is attached to a steel column. A method for constructing a nuclear reactor building, characterized in that after setting and fixing the steel plate formwork in between, concrete is poured using the steel plate formwork, and the steel plate formwork is embedded in the concrete frame as it is even after the concrete is poured. 2. The method for constructing a nuclear reactor building as set forth in claim 1, wherein the ceiling beam portion is a ceiling beam portion on the top floor of the reactor building.