JPS5919225B2 - Construction method of underground membrane tank - Google Patents

Description

[Detailed description of the invention] The present invention relates to a construction method for an underground membrane tank.

Conventionally, as an example of a construction method for an underground membrane tank, there is a method shown in Fig. 1.

That is, first, a concrete frame 1 with an open top is constructed in the ground G as shown in FIG.

Next, the roof 3 is assembled on the bottom surface of the frame 1, and the roof 3 with the cold insulating material 4 is lifted up via the wire rope 5 using a winch (or a jack), and the outer periphery of the roof 3 is attached to the outside as shown in the opening of the figure. It is fixed to the upper edge of the tank side plate 2, and then, as shown in FIG. It is arranged on the inner surface of the frame 1, and further a membrane 8 is arranged as shown in Figure 2, the seams of each membrane 8 are welded, and then the scaffold 6 is disassembled and carried out of the tank. .

Another example of the conventional tank construction method is the construction method shown in FIG.

That is, first, the center column 10 is erected at the center of the bottom surface of the structure 1, and the entire scaffold 1 is placed on the bottom surface of the structure 1 except for the center of the bottom surface.
1 is temporarily installed, a centering 12 is placed at the apex of the center column 10, a cold insulation material 7 and a membrane 8 are placed using a scaffold 11, and a roof frame 13 is lifted by a crane truck 14. Centering the end of 13 1
2 and the outer tank side plate 2, a roof plate (not shown) is provided, and the scaffold 11 and center column 10 are disassembled and carried out of the tank.

In both of the conventional construction methods described above, scaffolds 6 and 11 must be temporarily installed around the entire outer periphery of the bottom surface of the frame 1, and the scaffolds 6 and 11 must be disassembled, and depending on the work, they may fall over. Since the temporary construction and disassembly have to be repeated, the number of working days becomes longer and there are problems in terms of economy, safety, and workability, and improvements are desired.

Therefore, the present invention has been made in response to such a demand.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 5.

That is, this embodiment relates to a construction method for an underground membrane tank, and what is shown in FIG. 5 is a scaffolding device 20 used in that construction method.

To explain this scaffolding device 20, 21 is a support base fixed to the center of the bottom surface of the frame body 1, 22 is a center column rotatably disposed on the support base 21, and 23 is a support base fixed to the center of the bottom surface of the frame body 1. The side scaffolding is provided with a cross beam 24, a plurality of vertical beams 25 erected on the horizontal beam 24 at appropriate intervals, and vertically appropriate intervals between each vertical beam 25. The work platform 27 has a plurality of receiving shelves 26 disposed in the space, a work scaffold 27 extending horizontally from each receiving shelf 26 toward the inner surface of the frame 1, and a staircase 28.

29 is a self-propelled traveling device arranged at both ends of the lower part of the cross beam 24.

30 is a pair of joint beams connecting both ends of the cross beam 24 to the lower part of the center column 22, 31 is a reinforcing beam, and 32 is a side scaffolding 23.
It is a stair-type upper working floor arranged from the upper end to the upper end of the center column 22, and is designed to follow the tank roof.

33 is a handrail, 34 is from the side scaffolding 23 to the upper work floor 32
It is an entrance that leads to.

Note that this scaffolding device 20 is designed so that it can be disassembled into an appropriate size.

Next, the tank construction method will be explained.

First, the disassembled parts of the scaffolding device 20 are placed inside the pre-constructed frame 1, and the support base 21 is fixed at the center of the bottom of the frame 1.
The center column 22 is rotatably disposed on the support base 2.1, and the scaffolding device 20 is assembled within the frame 1 as shown in FIG. 3A.

Next, as shown in the opening of the same figure, by using the side scaffolding 23 of the scaffolding device 20, the cold insulating material 7 is arranged at a location on the inner surface of the frame 1 facing the side scaffolding 23.

At the same time, an adjuster 35 is placed on the top of the center column 22, and the centering 12 is placed on the adjuster 35.

Next, both ends of the roof frame 13 lifted by the crane truck 14 are fixed to the centering 12 and the upper edge of the outer tank side plate 2 using the upper work floor 32, and the roof frame 13 is attached to the reinforcing bone (
(not shown).

Next, a roof plate (not shown) is fixed on the roof ribs 13 and reinforcing bones, and a cold insulating material 4 is placed under the roof ribs 13 and reinforcing bones.

At the same time, a strip-shaped membrane 8 is disposed along the vertical direction on the cold insulating material 7 disposed on the inner surface of the frame 1.

Next, the traveling device 29 of the scaffolding device 20 is activated to rotate the scaffolding device 20 by an appropriate angle in one direction and then stopped, and the above-described operations are repeated to join the roof panels together and also join the membranes 8 together.

Next, as shown in Figure C, an automatic welding device (not shown) supported by a membrane welding frame 36 provided on the side surface of the side scaffold 23 is moved up and down to weld the seams of each membrane 8.

By repeating the above operations and rotating the scaffolding device 20 through 360 degrees, an underground membrane tank will be constructed.

Next, the scaffold device 20 is disassembled in order from the top, and the disassembled parts are lifted and discharged by a crane vehicle through the construction hole 37 in the roof board, as shown in FIG. 2, and the construction hole 37 is closed.

Although only one scaffolding device 20 was used in the above embodiment, the present invention is not limited to this. For example, as shown in FIGS. It may be provided.

For example, the cold insulation material 7 may be disposed on the inner surface of the frame 1 using the scaffolding device 20, and then the membrane 8 may be disposed and welded using the auxiliary scaffolding device 38.

As described above, according to the construction method of the underground membrane tank of the present invention, the tank side wall and the tank roof can be formed at the same time, so the work efficiency is high.
This can shorten the construction period and reduce costs.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic explanatory diagrams showing conventional tank construction methods, respectively. 3 to 5 show one embodiment of the present invention, FIG. 3 is a schematic explanatory diagram showing the work procedure, FIG. 4 is a view taken from the ■-■ arrow in FIG. is a perspective view of the scaffolding device. 6 and 7 show other embodiments of the present invention, and FIG.
The figure is a schematic explanatory diagram, and FIG. 7 is a view taken along the ■-■ arrow in FIG. 6. 1...Structure, 2...Outer tank side plate, 4, 7
...Cold insulation material, 8...Membrane, 12
・・・－・・・Centering, 13・・・・・・－Roof frame,
20...Scaffolding device, 21...Support stand,
22...Center column, 23...Side scaffolding, 29...Traveling device, 32...Upper working floor, 35...Adjuster , 36...
...Membrane welding frame, 37...Construction hole, 38...Auxiliary scaffolding device.

Claims (1)

[Claims] 1 Inside the frame with an open top, there is a support stand, a center column rotatably placed on the support stand, and side scaffolding that can move horizontally and placed at an appropriate location at an appropriate distance from the column. , a connecting body that connects the side scaffold to the column, and an upper working platform disposed from the top of the side scaffold to the top of the column, and then inserted in a disassembled state. Assemble the scaffolding device inside the structure by fixing it to the center of the bottom of the structure and rotatably arranging the center column on a support base, then use the side scaffolding of the scaffolding device to Cooling material is placed on the inner side of the opposing building blocks,
At the same time, an adjuster is installed on the top of the center column, a centering is placed on the adjuster, and then both ends of the roof frame lifted from outside the structure are connected to the centering and the upper edge of the outer tank side plate at the top of the structure. fixing using the upper working floor, fixing reinforcing bones to the roof bones, then fixing roof plates on the roof bones and reinforcing bones, placing a cold insulator under the roof bones and reinforcing bones, At the same time, a strip-shaped membrane is placed vertically on top of the cold insulation material placed on the inner surface of the structure, and then the scaffolding device is rotated in one direction at an appropriate angle and stopped, and the above-mentioned work is carried out. Repeat this process to join the roof panels together and then the membranes together, then move the automatic welding equipment supported by the side scaffolding up and down to weld the seams of each membrane. Once the type membrane tank is constructed, the scaffolding device is disassembled in order from the top, and the disassembled parts are lifted up and discharged through the construction hole in the roof plate, and the construction hole is closed. Tank construction method.