JPH0746152B2 - Structure of containment vessel wall - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a wall of a reactor containment vessel.

[Conventional technology]

Conventionally, a reactor containment vessel (hereinafter, abbreviated as a storage vessel) has been made to have a reinforced concrete structure. To construct this type of storage vessel, a weir plate is supported at a site by a support work and temporarily installed. It is common practice to assemble the formwork, assemble the reinforcing bars, then place concrete in the formwork, and remove the formwork after curing the concrete.

[Problems to be Solved by the Invention] However, in the above-mentioned construction method for constructing the containment vessel, it is necessary to assemble a large amount of reinforcing bars one by one on site, and a temporary mold using a weir plate and a supporting structure. Since it was necessary to assemble the frame and remove the formwork after curing, there was a problem that complicated construction with a large amount of work had to be performed on site. Therefore, in the construction of the reactor building, the construction of the storage container is a critical path in the process.

By the way, conventionally, a steel plate concrete wall is known in which concrete is cast between a pair of steel plates, and a tensile force is applied to the steel plate instead of the reinforcing bars. Therefore, when this type of steel plate concrete wall is applied, it is possible to simplify the work of assembling the rebar,
If a steel plate designed with structural strength in mind is provided on the inner surface side of the containment vessel, the liner thrust force may act on the steel plate due to the temperature rise in the event of an accident, which makes it difficult to design the inner steel plate. Since the thrust force of the steel sheet may act on the concrete skeleton and cause adverse effects such as cracking, there is a problem that it is practically impossible to apply.

The present invention has been made in view of the above problems, and can simplify the work of assembling the temporary formwork and the rebar, which has been conventionally required, and can significantly reduce the work period and save the labor of the construction, and also perform the liner construction. An object of the present invention is to provide a structure of a containment vessel wall which can be simplified and enables application of a steel plate concrete structure.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an outer formwork comprising a precast concrete inner formwork lined with a liner material, and a steel plate arranged apart from the inner formwork. And form a form unit by connecting with a connecting material,
It is made by placing concrete between the inner and outer molds.

[Action]

The inner and outer molds that can be produced at the factory can form a mold for concrete placement, which simplifies the mold assembling work and also bears the pulling force to replace the steel rebar with a steel outer mold. Since the frame is provided, the rebar assembling work can be simplified.

〔Example〕

1 and 2 show an embodiment of the present invention, and FIG. 3 shows a containment vessel A built inside the reactor building 1.

The reactor building 1 shown in FIG. 3 has a containment vessel A in the center thereof.
The pressure vessel 3 accommodating the reactor body is provided inside the containment vessel A.

The storage container A has a tubular shape, and its cross-sectional structure is, as shown in FIG. 1, an outer mold 5 on the outer peripheral portion, a concrete wall part 6 on the inner side thereof, and a precast concrete inner mold on the inner side. 7 and a liner material 8 lined in the inner formwork 7 as main components.

The outer mold 5 comprises a steel plate 10 curved with a predetermined curvature and stud bolts 11 fixed to the inner surface of the stud bolt 11 at a predetermined pitch, and an inner peripheral portion of a concrete wall 6 formed inside thereof. A reinforcing bar 12 for preventing cracks is embedded in the inside. The inner formwork 7 includes a precast concrete portion 13, a liner material 8 made of a steel plate lined on the inner surface thereof, and a stud bolt 14 fixed to the outer peripheral surface of the liner material 8 at a predetermined pitch and embedded in the concrete portion 13.
And a reinforcing bar 15 embedded in the outer peripheral portion of the precast concrete portion 13. Then, the steel plate 10 and the precast concrete portion 13 are, as shown in FIG.
The steel plate 10 and the precast concrete part 13 are connected in parallel to each other by a connecting member 16 such as a tie bar fixed to the precast concrete part 13.

The storage container A has a mold formed by joining a plurality of mold units Y as shown in FIG. 2 in which the outer mold 5 and the inner mold 7 are connected by a connecting member 16, It was constructed by placing concrete.

Next, a method for constructing the storage container A having the above configuration will be described in detail.

In order to construct the storage container A having the above structure, the outer mold 5 and the inner mold 7 are joined by the connecting member 16, and the storage container A is divided into a plurality of pieces in the circumferential direction. A plurality of form unit Y shown in are manufactured in a factory.

As described above, the form unit Y having a size obtained by dividing the storage container A into a plurality of parts is carried into the site by appropriately selecting a transportation means such as sea transportation or land transportation according to the size.

If a plurality of formwork units y having the above-mentioned configuration are carried into a predetermined position on the site, the steel plates 10 of the adjacent formwork units Y are mutually attached.
The precast concrete parts (13) adjacent to each other are joined together to form a formwork for building a containment vessel.

Next, concrete is poured into the gap between the steel plate 10 and the precast concrete wall portion 13 to form the concrete wall portion 6. In this way, by making the ready-made formwork unit Y produced at the factory and installed on the site to act as a formwork, construction of a temporary formwork consisting of supporting works and weirboards that had to be built on site in the past. The work can be eliminated and the work can be unsupported. That is, in order to construct the storage container A by assembling the formwork unit Y produced at the factory, the prefabrication and unitization are promoted, the work amount on site can be reduced, and the construction period can be shortened. In addition, the form unit Y
Since it is manufactured in a factory, quality control is easy and the quality can be stabilized. In installing the formwork unit Y, a crane used when constructing the reactor building 1 can be used, and the use efficiency of the crane is also improved by this use.

In the storage container A constructed as described above, the stud bolts 11 and the connecting members 16 improve the joint strength between the concrete wall portion 6 and the steel plate 10 and prevent the steel plate 10 from buckling. Further, in the storage container A, the tensile force is applied to the steel plate.
Due to the configuration that 10 bears, it is possible to omit the work of assembling the reinforcing bar that previously bears the pulling force in the conventional structure. On the other hand, the liner material 8 prevents a rapid temperature rise in the event of an accident.

By the way, it is necessary for the storage container A to adopt a structure capable of coping with a sudden temperature increase on the inner side that is expected in the event of an accident. In this respect, in the storage container A having the above structure, the precast concrete portion 13 of the inner formwork 7 has a heat insulating effect. Furthermore, since the liner material 8 is not a structural material that bears the structural strength of the storage container A, it can be designed to cope with the liner thrust force acting due to a rapid temperature rise in the event of an accident. Therefore, the liner material 8 can be designed by checking its distortion.

Further, in the construction of the containment vessel A, it is the steel plate 10 that is exposed to the outer peripheral side, and since the equipment work on the outside of this steel sheet 10 can be carried out during construction of the containment vessel A, both constructions are parallel. Can be made to proceed, and the workability is also improved.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention is one in which concrete is cast between a precast concrete inner formwork and an outer formwork located outside the inner formwork and spaced apart from the inner formwork. And because the ready-made inner and outer molds manufactured at the factory can be brought into the site and assembled,
Since it can be prefabricated, it is possible to omit the work of assembling and removing the temporary formwork consisting of the weir plate and the support work, which had been done on-site in the past, and it is possible to shorten the construction period and simplify the construction. is there. Further, the inner mold and the outer mold can be manufactured in a factory, and the quality control is facilitated, so that the quality can be improved. Further, since the tensile force is borne by the steel plate of the outer formwork in place of the conventional reinforcing bar, by adopting the structure of the present invention, the structural reinforcing bar can be omitted and the assembling work of the reinforcing bar can be simplified and This has the effect of significantly reducing the amount of work. Further, since the liner material is lined inside the inner formwork, there is an effect that the liner construction on site can be simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of a formwork unit, and FIG. 3 is a reactor building constructed by applying the structure of the embodiment to a containment vessel. It is a block diagram. A: containment vessel, 1 reactor building, 5 outer mold, 6
…… Concrete wall, 7 …… Inner form, 8 …… Liner material, 10 …… Steel plate, 11,14 …… Stud bolt, 12,15 ……
Reinforcing bar, 13 …… Precast concrete section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isamu Yamamoto 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Kazuhiko Osawa 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (56) Reference JP-A-59-116090 (JP, A) JP-A-62-170885 (JP, A) Practical application Sho-59-29797 (JP, U)

Claims (4)

[Claims] 1. A connecting member for connecting an inner formwork made of precast concrete lined with a liner material and an outer formwork comprising a steel plate arranged outside the inner formwork and spaced apart from the inner formwork. To form a mold unit, join a plurality of the mold units to form a mold, and place concrete between the inner mold and the outer mold to form the inner mold and the outer mold. The structure of the wall of the reactor containment vessel that integrates the frame. 2. The structure of the reactor containment vessel wall according to claim 1, wherein stud bolts are attached to the inner surface of the outer form. 3. The structure of the reactor containment vessel wall according to claim 1, wherein a reinforcing bar is provided between the outer mold and the inner mold. 4. A precast concrete inner formwork having reinforcing bars embedded therein.
The structure of the wall of the containment vessel of paragraph.