JPH0699959B2 - Nuclear power plant building construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a construction method for a nuclear power plant building, and is particularly suitable for accelerating the work exhaustion of construction work in a plant having a short construction period. Related to the construction method of the nuclear power plant building.

[Conventional technology]

The current nuclear power plant is a huge one-productive plant, and its construction work is carried out with a huge amount of material and labor.

Due to various electric power circumstances, the recent construction work of a nuclear power plant is required to greatly shorten the process and reduce the cost. The construction of the ultra-short process nuclear power plant that shortens the conventional construction work period by about one year is required. Development of construction method is required.

However, the construction work of the present nuclear power plant is organically complicated by the huge equipment installation work to be installed inside the power plant and the civil engineering construction work to construct the main body of the power plant. There is a limit to shortening the construction period by inputting. Even so, the machine side work is a direct-on construction method in which the prefabricated product, which is an integrated unit of machines, pipes, tanks, etc., is installed in a factory or on-site processing site, and a large hoist directly hangs the prefabricated product to a predetermined installation position in the building By adopting the above, etc., the labor saving on site construction and the construction work have been made much faster than before. On the other hand, the construction work is still following the conventional reinforced concrete work.

Specifically, as shown in the construction procedure in FIG. 9, (1) rebar construction, (2) formwork and support work, (3) concrete placing, (4) formwork and support dismantling work repeated Is.
Of the above works, the reinforcement work (1) has a large amount of reinforcements compared to general structures due to the nature of the nuclear power plant. Although the prefabricated reinforcing bar construction method has been put to practical use, fundamental work has not been improved and the process has not been shortened due to problems such as interference with the joint structure and other buried objects. Moreover, in the current reinforced concrete construction, a structure that holds the formwork is required when placing concrete, but generally, scaffolding is used to hold the formwork such as columns and walls, and the formwork of beams and floors is held. For this beam and floor, all the weight of the placed concrete must be held by the temporary material, and the supporting capacity of ordinary scaffolding materials is insufficient. The complexity of the formwork work due to the proper use of these formwork holding structures and the refilling work is also an obstacle to shortening the construction work process.

In general building work, in order to achieve an early start of the frame work, for example, as described in JP-A-49-82125,
Steel panel units are erected in parallel on the foundation, and the transverse beams of the ceiling frame of the box unit, which are sequentially stacked and inserted between the steel panel units, are joined to the pillars of the steel panel unit, and the box units are individually provided with transverse beams. In some cases, the "construction method for medium- and high-rise prefabricated buildings" that supports and reduces the weight of the frame is adopted. However, the nuclear power plant building requires strong seismic resistance in order to ensure the safety and equipment retention of the reactor facility in the event of an earthquake or other disaster, and therefore the building structure has a heavier reinforced concrete structure than the general building. Therefore, it was inappropriate from the viewpoint of earthquake resistance to construct a nuclear power plant building with a prefabricated building structure by joining the above-mentioned simple panel units.

Further, as a construction method for early rising of a frame structure using a precast concrete member, there is a construction method disclosed in JP-A-51-177410. This is a construction method in which each floor of the building is constructed by building a groove-type precast concrete foundation panel in the foundation and then building a gate-type precast concrete reference panel on it. When this construction method is used, the building frame structure becomes a strong precast concrete structure and satisfies the earthquake resistance. However, in general, each floor structure of a nuclear power plant building requires a floor height of about 10 m and a beam span of about 12 m in order to install large equipment and tanks. In addition, the building wall and floor thickness are required to be about 2 m due to the requirements for earthquake resistance and radiation shielding. If a structure of such a scale and dimensions is made into a unit of precast concrete, the weight of the unit alone will be over 1,000 tons. In the construction work of the present nuclear power plant building, using the precast concrete unit construction method was inappropriate in terms of capacity and cost in terms of adaptation of the lifting machine equipment and the transportation facility used for the installation of the unit. .

In addition, in Japanese Patent Laid-Open No. 51-31019, a separately manufactured core
Although a construction method is described in which the unit is brought into the construction site and concrete is placed using this as an internal formwork, however, consideration for the high ceiling height of nuclear power plants and the installation of large equipment was lacking. .

[Problems to be Solved by the Invention]

The above-mentioned conventional technology, in the construction work of general buildings, enabled early start-up of the frame work by using various prefabricated construction methods, but in order to use these construction methods for the construction of the nuclear power plant building, It was unsuitable because it was unsuitable in terms of strength, earthquake resistance, and radiation shielding ability, and also had the adverse effect of enlarging construction equipment. Therefore, the building is built by using the conventional general reinforced concrete construction method, and due to the congestion of the working process, the shortening of the construction work period and further the shortening of the nuclear power plant construction work period are hindered.

The purpose of the present invention is to accelerate the construction period of the nuclear power plant building, and to incorporate the machine side construction into the construction process, and to use the construction method of the building frame that allows the machine side process to be moved forward. It is to provide a nuclear power plant with a shortened process.

[Means for Solving the Problems]

The above-mentioned purpose is in the construction method of the nuclear power plant building,
After placing concrete on the building floor, a support member (3) for supporting the column reinforcement and wall reinforcement (4) is set at a predetermined position on the floor, and the pre-assembled column reinforcement and wall reinforcement (4) are set at the predetermined position. Suspend and fix to the support member (3),
The support member (3) or the column and wall reinforcements (4)
Before and after the construction of, the pipes (6), trays, duct support fittings or small equipment (5), etc. are carried in to predetermined positions on the floor other than the positions where the pillars and walls are constructed, and then the steel structural material. A structure (8) (hereinafter referred to as a steel foam module: SFM) that is made in advance by closing the upper surface of the frame (1) made of (Referred to as) is the pipe (6), tray, duct support fitting or small device (5) that has been carried in.
Etc. are hung inside, and the iron plate formwork (2) on the side surface of the structure (8) is positioned and fixed at a predetermined position,
The iron plate formwork (2) on the side surface of the structure (8) is used as a concrete pouring formwork for at least one surface of the wall, and the iron plate formwork on the upper surface of the structure is used as a concrete pouring formwork for the ceiling. By using the concrete (11) for the wall and the ceiling at the same time, the inner surface of the steel plate form of the structure is used as the ceiling surface and the wall surface even after the concrete (11) is cast. Achieved by the construction method of the building.

[Action]

According to the above configuration, by also using the SFM as a concrete formwork, there is no need for formwork support work, so it is possible to perform separate work within the SFM even during concrete pouring or curing periods, and further configure the SFM. As a result of the steel plate formwork and frame being exposed as the wall surface inside the building, it is possible to freely set the positions of supporting metal fittings for pipes and equipment, and it is possible to install small equipment in parallel with concrete pouring. In addition, it is possible to shorten the construction period of the nuclear power plant construction work and save labor by, for example, placing concrete without the two-step process of the ceiling and the wall.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall view of the SFM according to this embodiment, FIG. 2 shows a vertical sectional view in the longitudinal direction thereof, FIG. 3 shows a plane sectional view, and FIG. 4 shows a vertical sectional view in the short side direction. .

The structure of the SFM of this embodiment will be described below. The frame 1 is a steel structural material that forms the framework of SFM, and has the strength to support the load of concrete when it is placed on columns, walls, beams and ceilings. The iron plate formwork 2 is a member that functions as a concrete formwork when concrete is placed on each part of columns, walls, beams and ceilings, and is set outside the frame 1 so as to cover the frame. .

Next, the construction sequence of the frame building using SFM will be described with reference to FIG.

1) On the floor, the support material 3 for supporting the reinforcing bar is set in advance.

2) Suspend prefabricated column and wall reinforcements 4 on the support material 3 and fix them.

3) Next, equipment 5, piping 6, dry panel 7 for partition walls
Are loaded using a lifting machine.

4) Suspend SFM8 using a lifting machine and turnbuckle 9
And the frame tightening metal fittings 10 etc.

5) Concrete 11 is poured.

Next, the sixth example of the layout of the nuclear power plant building using SFM
Shown in FIG. FIG. 6 shows a cross-sectional view of the reactor building, and FIG. 7 shows a plan view of the reactor building. SFM is applied to the section surrounded by the black frame in the figure.

As described above, by the skeleton construction method of the nuclear power plant building using the SFM according to the present embodiment, the drawbacks of the conventional construction method are solved as follows, accelerating the construction of the skeleton structure and shortening the construction process. To be

1) By using SFM, unlike the conventional process, it is not necessary to perform the concrete pouring work in two steps, that is, the wall and the ceiling, and the work process is eased.

2) Since the frame structure, which is a skeletal steel material of SFM, holds the weight of concrete when pouring concrete, it is unnecessary to perform support and assembly and dismantling work as in the conventional method.

3) Since it is not necessary to place concrete and support work during curing, it is possible to start work ahead of the machine side.

4) By using the SFM steel plate formwork that covers the walls of the concrete frame and the ceiling, it is possible to freely set the positions of the support fittings for the pipes, trays, and ducts to be installed in the building. There is no need to use metal fittings. As a result, the work of setting the embedded metal fitting, which has been conventionally folded during the rebar work, is reduced, and the rebar process is alleviated.

5) Since the iron plate formwork is exposed on the wall surface inside the building, the building is protected during the work inside the building, and the painting work on the inside wall does not require wall polishing as compared with conventional concrete surface painting. The work is simplified.

6) By promoting prefabrication of the building frame, the amount of work on site can be reduced, the local work environment can be improved, and the work man-hours can be leveled. Further, the mechanization of the prefabricated product factory production part improves productivity and product reliability.

The following construction method is an application example of this embodiment.

When assembling the SFM in the factory or on-site prefab yard, the steel plate formwork inside the module has pipes, trays, ducts,
The support metal fittings and small equipment are installed at the same time, and they are hung on the site with a large lifting machine. This method, which is a composite module of building frame and machinery, is the most advanced method in terms of streamlining and improving the efficiency of on-site work at construction sites.

FIG. 8 shows a cross-sectional view of an SFM incorporating a pipe and equipment, which is an application example of this embodiment. Duct 12, tray 13 and piping 1
4 is installed on the frame 1 and the steel plate form 2 at the same time when the SFM is assembled. The procedure for constructing the module body conforms to Fig. 5.

〔The invention's effect〕

According to the construction method of the nuclear power plant building according to the present invention, the SF
Since M is used as a concrete formwork, it is possible to omit formwork work that was conventionally a different type of work, so formwork assembly, support work, and support work and concrete dismantling work after the concrete curing period has passed. It becomes unnecessary. Moreover, since the SFM is loaded after the large-scale equipment of the nuclear power plant building is loaded in advance, the nuclear power plant equipment side construction and the building side skeleton construction can be performed in parallel within the SFM.

It is also possible to use the SFM steel plate formwork and frame instead of the conventional concrete embedded metal as a support base for pipes, trays, ducts and equipment specific to nuclear power plants, water supply and drainage, electrical equipment, etc. Since it is possible, the setting work of the embedded hardware, which has caused the complexity of the conventional bar arrangement work, is omitted,
In addition, since the walls are made of iron plates, the interior work of the building is simplified compared to concrete walls.

Thus, according to the present invention, it is possible to save labor and speed up the construction work, and the equipment-side work, which was a post-process of the construction work in the past, is carried out in parallel with the construction work. Since it is possible to start the work on the equipment side ahead of time and also to promote various incidental works, it is possible to shorten the overall process of the nuclear power plant construction and save labor.

[Brief description of drawings]

FIG. 1 is an overall view of the SFM, FIG. 2 is a vertical sectional view in the longitudinal direction thereof, FIG. 3 is a horizontal sectional view, FIG. 4 is a vertical sectional view in the short side direction, and FIGS. 5 (A) to (D). Is a diagram showing the construction procedure of the building structure using SFM, Fig. 6 is a sectional view of the reactor building using SFM, Fig. 7 is its plan view, Fig. 8 is a sectional view of composite SFM, and Fig. 9 [Fig. 6] is a diagram showing a conventional construction procedure of a building structure. DESCRIPTION OF SYMBOLS 1 ... Frame, 1 ... Iron plate formwork, 3 ... Support material, 4 ... Prefabricated rebar, 5 ... Equipment, 6 ... Piping, 7 ... Dry panel, 8 ...
Steel foam module (SFM), 9 ... Turnbuckle, 10 ... Form clamps, 11 ... Concrete.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sumio Iwashima 3-1-1 Sachimachi, Hitachi City, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Suiji Ishii 3-chome, Hitachi City, Ibaraki Prefecture No. 1 Inside Hitachi Works, Hitachi Works (72) Inventor Tadao Suzuki 3 1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Works, Hitachi Works (56) References JP-A-51-31019 ( JP, A)

Claims (4)

[Claims] 1. A method of constructing a nuclear power plant building, wherein after the concrete is cast on the building floor, a support member for supporting the column reinforcement and the wall reinforcement is set at a predetermined position on the floor, and the column reinforcement and the wall reinforcement are preassembled. Fixed to the support member by suspending at the predetermined position, before and after the construction of the support member or the column reinforcement and the wall reinforcement, piping at a predetermined position on the floor other than the construction position of the column and the wall, the tray , A duct support metal fitting or small equipment, etc. are carried in, and then the upper surface of the frame made of steel structural material and at least the outer sides of the opposite side surfaces are closed by the iron plate formwork, and the lower surface is opened, and the structure is manufactured in advance. The body is hung so that the pipes, trays, duct support fittings, small equipment, etc. that have been carried in are contained therein, and the outer surface of the iron plate formwork on the side surface of the structure is positioned and fixed at a predetermined position. While using the iron plate formwork of the surface as a concrete pouring formwork of at least one surface of the wall, by using the iron plate formwork of the upper surface of the structure as a concrete pouring formwork of the ceiling, between the wall and the ceiling. A construction method for a nuclear power plant building, wherein concrete is poured at the same time, and the inner surface of the steel plate formwork of the structure is used as a ceiling surface and a wall surface even after the concrete is poured. 2. A construction method for a nuclear power plant building according to claim 1, wherein the position of the support metal fittings of the equipment for the nuclear power plant is freely set on the iron plate form. 3. The nuclear power plant according to claim 1, wherein installation work of pipes, trays, ducts, support fittings or small equipments installed in the building is performed in parallel with the concrete placing work. Building construction method. 4. A pipe, a tray, a duct, a support metal fitting, or small equipment installed in the building is attached to the structure in advance when the steel foam module which is the structure is manufactured. The construction method for the nuclear power plant building described in paragraph 1.