JPH0452436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in the construction method of a lined storage tank, for example, a lined storage tank for storing radioactive waste provided in a nuclear power plant.

[Background of the invention]

Taking a lined storage tank for a nuclear power plant as an example, a lined storage tank for a nuclear power plant is installed to store radioactive waste liquid generated from a nuclear power generation facility and attenuate the radioactivity of the waste liquid. There are also systems installed to separate and purify the waste liquid by passing it through various lined storage tanks and reusing it as circulating water within the reactor.

The lining storage tank has a rectangular shape, and when storing a relatively large volume of waste liquid in the power radioactive waste liquid treatment system of recent nuclear power plants, it has advantages such as the space factor of the reactor building. It is attracting attention and being adopted as an alternative to More than ten lined storage tanks of this type are normally planned to be installed in each nuclear power plant, but due to their function of storing radioactive waste liquid, they are specially designed to maintain the integrity of the tank during the life of the plant. It must be designed to prevent liquid from leaking out of the system.

The structure of a conventional lined storage tank, as shown in a vertical cross-sectional view in FIG. The structure consists of long reinforcing metal fittings 3 and studs 4 attached to these, and concrete is poured around them so as to envelop them, and the liner plate 1 is placed in a pit formed by the concrete building wall. It has an overall rectangular shape with a lining. The long base hardware 2 serves as an anchor as well as a backing metal when welding the liner plate 1, and the reinforcing hardware 3 is used to lift the storage tank.
The studs 4 serve as reinforcement to maintain the integrity of the liner plate 1 during transport and concrete pouring, and the studs 4 serve to integrate the poured concrete and the liner plate 1.

The construction method for this conventional lined storage tank is as described below. A lined storage tank, for example, has a fairly large capacity of about 200m ³ , so it is economically disadvantageous to assemble the tank into a rectangular shape at a factory and transport it to the site. Therefore, the factory manufactures four liner panels, as shown in Figure 2, which form one side of the storage tank. This liner panel includes liner plates 1 welded together, base hardware 2 welded thereto and serving as a backing for welding the liner plates together, and in order to prevent out-of-plane deformation of the liner plates, It consists of a grid-like reinforcing metal fitting 3 welded to it.

Next, the four liner panels transported from the factory are assembled into a rectangular shape by welding at the on-site assembly yard to form the four circumferential side walls of the storage tank. Next, this storage tank is carried into the storage tank installation area by a crane. This transport is carried out by interposing a rectangular suspension balance formed by a beam between the storage tank and the crane to prevent deformation of the storage tank due to lifting.

Next, on the outer surface of the storage tank brought into the storage tank installation area, separators (not shown) and studs 4 are lined with base hardware 2 to ensure the integrity of the lining storage tank during and after concrete pouring.
Or attach it to reinforcing hardware 3. The separator is liner plate 1 for concrete placement pressure.
In order to prevent out-of-plane deformation of the liner plate, the stud 4 is installed between the liner plate and the concrete casting formwork, and the stud 4 is used to integrate the concrete and the liner plate. Furthermore, grid-shaped reinforcing bars will be placed around the outer circumference of the storage tank to maintain the integrity of the concrete wall against earthquake forces. After installing the separators, studs, and reinforcing bars, concrete will be poured around the tank to completely envelop them.

Regarding the bottom of the storage tank, after forming the upper floor (ceiling) of the storage tank, the liner plate for the bottom is carried in from the ceiling hatch and welded to the base metal fittings that have been embedded in the concrete frame wall in advance. form.

In the conventional lined storage tank construction method described above, reinforcing hardware is used to reinforce the liner panel during transport from the factory to the site, and to prevent out-of-plane deformation of the liner plate during storage tank transport and concrete pouring at the site. It is used for reinforcement and is only useful when constructing lining storage tanks.
It is completely unrelated to maintaining the storage tank function after construction is completed. However, the amount of reinforcing hardware per tank is large, and it requires a lot of labor and time to weld directly to the storage tank. Therefore, when looking at the lined storage tanks as a whole, which can include more than a dozen of them per plant, reinforcing hardware is often used in lined storage tanks. This has become a factor in increasing costs.

Against this background, it is desirable to reduce costs by reducing the amount of reinforcing hardware that becomes unnecessary after completion of lining storage tank construction.

[Purpose of the invention]

The purpose of the present invention is to utilize the reinforcing material to effectively reinforce the storage tank during construction of the lining storage tank and to make it convenient for the construction work, but to utilize the reinforcing material as a material that can be finally recovered before the construction is completed. To provide a lining storage tank construction method that saves labor and required working time.

[Summary of the invention]

The feature of the lining storage tank construction method of the present invention is that a wall liner panel is manufactured in a factory, which is made up of a liner plate and reinforcing materials arranged in a lattice shape that are removably attached to the liner plate via hooks and can be disassembled. , weld four of these liner panels into a box shape at an on-site assembly yard, transport this box to the storage tank installation area, remove all the hooks and reinforcing materials from the liner panels before or after welding, and remove these from the liner panels. A pedestal is formed inside the box using reinforcing material, and a dimension-adjustable reinforcing beam device for concrete pouring is attached to this pedestal, and the box is held from the inside by the reinforcing beam device for concrete pouring. The purpose is to pour concrete around its outer periphery.

[Embodiments of the invention]

Embodiments of the present invention will be explained with reference to FIGS. 3 to 8.

First, the liner panel shown in Figure 3 is manufactured at a factory. Figure a is a front view thereof, and figure b is a cross-sectional view taken along line A-A. This liner panel is composed of a liner plate 1, a long base hardware 2, a substantially U-shaped hook 5, a long reinforcing member 6 assembled in a lattice shape, and bolts 7. Liner plate 1
The comrades are butt welded using the base hardware 2 as a backing, and the hooks 5 are fixed with bolts 7 to the top, bottom, left and right ends of the reinforcing material 6 assembled in a lattice shape.
A base hardware 2 is hooked across the outer periphery of the liner panel 1, and is clamped and fixed to the liner plate 1 by bolts 9 screwed into hooks 5. As a result, the reinforcing material 9 is disposed on the entire surface of the liner plate 1, and the hook 5 and the reinforcing material 6 are integrated with the liner plate 1. The connecting parts of the vertical and horizontal reinforcing members 6 are fixed with bolts 8a using L-beams 8 as backing plates, as shown in FIG. The hook 5 and reinforcing material 6 are attached without welding to the surface of the liner plate 1 (the surface that appears on the front side when the storage tank is formed), and the base hardware 2 is attached to the back surface of the liner plate 1 (the surface that appears on the front side when the storage tank is formed). Please note that it is welded to the side (hidden on the back side). The vertical and horizontal installation pitches of the reinforcing material 6 are as follows:
It is selected to prevent deformation of the liner plate 1 when lifting and transporting the liner panel.

After four such liner panels are transported to a local assembly yard, they are welded together and assembled into a box shape (at this time, the reinforcing material 6 is placed on the inside). During this welding, the horizontal hook 5 is removed by loosening the bolt 9 and removing the bolt 7. FIG. 4 shows the appearance of the storage tank assembled into a box shape in this way.

Next, the storage tank assembled in a box shape is transported to the storage tank installation area using a crane using a hanging balance.
As shown in Figure a, after attaching the studs 4 to the base hardware 2 and arranging the reinforcing bars 10 around them, as shown in Figure 5b, the reinforcing materials 6 and hooks 5 on each wall are removed, and these reinforcements are removed. Using the material 6 and necessary additional members, assemble and form the pedestal in the storage tank. A reinforcing beam device 11 for concrete placement whose dimensions can be adjusted as described below is attached to this frame.

FIG. 6 shows a state in which the reinforcing beam device 11 for concrete pouring is attached to the pedestal formed of the reinforcing material 6 as described above. Reinforcement beam device 11 for concrete placement with adjustable dimensions
It has a bolted structure.

FIG. 7 is a partially enlarged cross-sectional view showing the details of the dimension-adjustable reinforcing beam device 11 for concrete pouring. By passing the bolt 11b welded to the abutting beam 11c and tightening it with the nut d, the main beam member 11
Fine adjustment of the dimension between a and the contact beam 11c is possible. During concrete pouring, the abutment beam 11c comes into contact with the liner plate 1, and at this time, a plywood plate 12 is interposed between the two, and the abutment beam 11c of the reinforcing beam device for concrete pouring is connected to the liner plate forming the inner surface of the storage tank. By adjusting the dimensions described above so that the liner plate 1 comes into contact with the surface of the liner plate 1, out-of-plane deformation of the liner plate 1 due to concrete placement pressure can be prevented while protecting the lining surface.

Finally, as shown in FIG. 8, the frame to which the reinforcing beam device 11 for concrete pouring with the structure and function described above is attached is installed inside the storage tank so as to reach the top of the storage tank via the support columns 13. This will hold the tank from the inside and pour concrete around the outside of the tank. By doing so, it is possible to prevent the liner plate 1 from being deformed out of plane due to concrete placement pressure.

Since the deflection of the liner plate 1 due to concrete pouring is affected by the concrete pouring height, concrete pouring is carried out in several batches to prevent deformation of the liner plate. Therefore, the number of reinforcing beam devices 11 for concrete placement must be such that it can withstand the placing pressure applied to the liner plate depending on the height of one concrete placement and prevent the liner plate from deforming. It is not enough, and it is enough.

When pouring concrete, since the bottom of the storage tank is not lined, there is no need to take into account damage to the liner plate at the bottom of the storage tank due to the weight of the pedestal and the reinforcing beam device 11 for concrete pouring.

In order to shorten the overall construction period, welding of the bottom liner plate will be carried out at the final stage of lining storage tank construction, as in the past.

9 and 10 show other embodiments of the invention. In the above-mentioned embodiment, after the storage tank welded into a box shape was carried into the storage tank installation area at the on-site assembly yard, the reinforcing members 6 on each wall were removed and assembled as a frame. In the example shown in FIG. 9, when the four liner panels shown in FIG. 3 manufactured at a factory are welded together in a field assembly yard and assembled into a box shape, each liner panel is welded together in a state shown in FIG. 9a. After setting as shown, reinforcing material 6 and hook 5 of each liner panel
The reinforcing members 6 that have been removed are assembled as shown in Figures 9b and 10, and the support pillars 13 are attached to form a pedestal inside the box. After the storage tank, which is used as a pedestal and is further assembled into a box shape by welding, and the work pedestal are carried into the storage tank installation area, the above-mentioned dimension-adjustable reinforcing beam device 11 for concrete pouring is attached to the pedestal.

According to this embodiment, it is possible to simplify the pedestal assembly without having to prepare a separate working pedestal when welding the liner panel, and it is possible to further improve the quality of the storage tank and reduce costs.

〔Effect of the invention〕

As explained above, according to the lining storage tank construction method of the present invention, the reinforcing material of the liner panel is not welded but is temporarily installed for construction, so it can be directly welded to the storage tank. Compared to conventional methods, the welding effort and time are saved, and the quality of the tank is improved.In addition, these reinforcement materials are not ultimately embedded in the concrete, but are removed and recovered before construction is completed. Therefore, it is possible to save on materials.

Furthermore, the reinforcing material temporarily installed on the liner panel can be assembled and used as a work frame during construction, and furthermore as a support frame to resist concrete pouring pressure. In addition, each of the reinforcing materials only needs to have sufficient strength to serve as a reinforcing member during transportation and assembly of the liner panel, without considering the strength to withstand concrete placement pressure, so the amount of material used can be reduced. can.

Therefore, according to the present invention, the cost of constructing a lined storage tank per plant can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a lined storage tank, Fig. 2 is a partially cutaway surface view of a liner panel in a conventional construction method, and Figs. 3 a, b, and c are liners in an embodiment of the present invention. A surface view, an A-A cross-sectional view, and a partial detailed view of each panel, FIG. 4 is a perspective view of the liner panel shown in FIG. 3 assembled into a box-shaped storage tank, and FIG. 5 a shows the box-shaped storage tank shown in FIG. 4. Figure 5b is a top view showing the state in which reinforcing bars are placed around the frame after installation, Figure 5b is a top view when the reinforcing material is assembled as a pedestal in the above state, and Figure 6 is a top view showing the reinforcing beam device for concrete pouring installed on the pedestal. Fig. 7 is a cross-sectional view of the reinforcing beam device for concrete pouring, Fig. 8 is a perspective view showing the frame of Fig. 6 assembled and stacked, Fig. 9 a and b are the main parts. Figure 10 shows another embodiment of the invention, in which Figure a is a top view when the box-shaped storage tank is assembled, Figure b is a top view when the reinforcing member 6 removed after assembly is assembled as a frame, and Figure 10 is a top view when the box-shaped storage tank is assembled. FIG. 9 is a perspective view of FIG. 9; 1...liner plate, 2...base hardware, 3
...Reinforcement hardware, 4...Studs, 5...Hooks,
6...Reinforcement material, 10...Reinforcement bar, 11...Reinforcement beam device for concrete placement, 12...Plywood board,
13...Support pillar.

Claims (1)

[Scope of Claims] 1. A large number of liner panels for wall surfaces made of a liner plate and reinforcing members arranged in a lattice pattern that are removably attached to the entire surface of the liner plate via hooks and disassembleable are manufactured at a factory. These liner panels are manufactured, transported to an on-site assembly yard, and then four of these liner panels are welded into a box shape at the on-site assembly yard, and this box is carried to the storage tank installation area, and in the storage tank installation area,
All the hooks and reinforcing materials mentioned above are removed from the liner panel, a pedestal is formed inside the box using these removed reinforcing materials, and a reinforcing beam device for concrete pouring with adjustable dimensions is attached to this pedestal. A method for constructing a lined storage tank, characterized by pouring concrete around the outer periphery of the box while holding the box from the inside using a reinforcing beam device for concrete pouring. 2. A large number of liner panels for wall surfaces consisting of a liner plate and reinforcing materials arranged in a lattice pattern that can be detached and disassembled and attached removably to the entire surface of the liner plate via hooks are manufactured in a factory, and these liner panels After transporting the liner panel to the on-site assembly yard and setting four of these liner panels in a box shape at the on-site assembly yard, all the hooks and reinforcing materials mentioned above were removed from the liner panel, and these removed reinforcing materials were used to assemble the above box. A pedestal is formed inside the shape, a box is welded using the pedestal, the box and the pedestal are transported to a storage tank installation area, and the dimensions of the pedestal can be adjusted in the storage tank installation area. A method for constructing a lining storage tank, which comprises: attaching a reinforcing beam device for concrete pouring, and pouring concrete around the outer periphery of the box while holding the box from the inside with the reinforcing beam device for concrete pouring.