JPS5916621B2 - How to build side walls of underground tanks - Google Patents

Description

[Detailed description of the invention] <Explanation of the gist> The invention of this application relates to a method for constructing a side wall of an underground tank having an underground wall as a side wall and a lining inside the side wall, and in particular, a method for constructing a side wall of an underground tank that has an underground wall as a side wall and a lining inside the side wall. A bottom plate is set between the lining plate and the underground wall, side wall concrete is cast in the space formed by these, and after curing, the joint of the lining plate is This invention relates to a method for constructing a side wall of an underground tank, in which the side wall lining is formed by seal welding.

<Prior art> Conventionally, as a method for constructing the side wall lining of an underground tank, for example, a lining plate is appropriately attached to the inside of the concrete side wall formed by the reverse winding method on the underground wall in a separate process, and the lining plate is A construction method has been adopted in which the joints are seal-welded and, if necessary, the gap between the concrete side wall and the lining plate is filled with mortar.

Another method is to construct a side wall lining at the same time as constructing the side wall by casting an inner formwork in a predetermined position so as to be integrated with the concrete side wall when constructing the concrete side wall.

<Problems with the prior art> However, the former method in the prior art described above requires multiple steps, and
This method requires curing time for the poured concrete, which requires a large number of man-hours and time, and has the disadvantage of increasing costs.

In addition, the latter conventional construction method has the disadvantage that the formwork support required for each work process requires a lot of man-hours and labor, and is cumbersome to manage. The construction accuracy of the inner lining had to be maintained based on the required accuracy, and there was also a problem in that it was difficult to perform the work.

<Objective of the Invention> The object of the invention of this application is to solve the problems of the method of constructing the concrete side wall of an underground tank and its lining based on the above-mentioned prior art as a technical problem, to form a lining plate into a prefabricated formwork, The purpose of this invention is to provide an excellent underground tank construction method that facilitates construction, improves construction accuracy, and reduces costs, and is beneficial to the field of tank utilization in the energy industry.

<Structure of the Invention> In order to solve the above-mentioned problems, the structure of the invention of this application, which is based on the above-mentioned claims in accordance with the above-mentioned object, is to provide a reinforcing material to the lining plate using tie bars when constructing the tank side wall. The bottom plate was set between the formwork and the underground wall, which was prefabricated and set on the underground wall with a gap between them.
Concrete is poured in this space, and after the poured concrete has cured, the joints of the lining plates are seal-welded to form the side wall lining, replacing the multi-step process in the conventional construction method with one step. This technology has the advantage of making it possible to shorten the length of the construction process, and, in comparison with conventional construction methods, to omit the need for formwork support.

<Example> Next, an example of the invention of this application will be described below with reference to the drawings.

1 is an underground tank that is being constructed by the method of the invention of this application, in which a predetermined underground wall 3 for retaining earth is formed in advance as an outer formwork by concrete pouring means in the ground 2; The inner ground 2 surrounded by the underground wall 3 is excavated to a predetermined depth.

The lining plates 4, 4, 4, .・・・
. . . and special nuts 6, 6, 6, which have female threads on both sides with a partition in between, are welded and fixed in a predetermined arrangement, and are drilled into the surface of the lining plate 4. A tie bar 8 is screwed into and extended from the special nut 6 through the planted hole T, and a plurality of U-shaped steel members 9 and 10 are arranged horizontally and vertically on the surface of the lining plate 4 as reinforcing materials. Then, tighten the nut 1 against the outer end of the tie bar 8.
Formwork 1 of each unit tightened and fixed in step 1 and made into a block.
Make 2. A tie bar 13 is screwed inwardly extending from the inner female threaded portion of the nut 6, and a female thread is carved into the inner end of the tie bar 13.

On the other hand, another tie bar 14, 14, 14, . The tie bars 14 are embedded in the wall, and when installing the block formworks 12, 12, 12, etc., the tie bars 14 are connected to the turn packs 15 at predetermined positions for each tie bar 13 of the block formwork 12. The gap between the underground wall 3 and the lining plate 4 is set appropriately. Next, the blocked formwork 12, 12,
12... At the time of installation, each bottom plate 16 is attached to a rod 18 having a turnpatch IT at the upper end, and a threaded anchor 19.
A hanging tool consisting of a rod 1 for the turnpatch IT
Attach by screwing the upper end of No. 8.

Incidentally, the hanging tool is hung as appropriate. In this way, after the side wall concrete form work is completed, side wall concrete 21 is cast from the inlet (not shown) provided at the required location on the upper end of the block form 12, and the underground wall 3 is turned into an outer form. The lining plate 4 is cured as an inner formwork, and after curing, the tie bar 8 and the U-shaped steel members 9 and 10 are dismantled, and the joints of the planting hole T) and each of the lining plates 4 are sealed and welded to a predetermined position. After completing the construction of the side wall lining, we move on to the next stage of work.

During this time, the upper surface of the uppermost concrete 21 is naturally flattened in advance, as shown in FIG. 1a. After removing the tie bar 8 and the U-shaped steel members 9 and 10, the bottom plate 16 is removed by removing the anchor 19 by unscrewing it from the rod 18.
The inner surface of the underground wall 3 at the lower level is excavated, and the block forming formwork 12 is again connected to the underground wall 3 with tie bars 8 and 14, and the turn pack 17 is screwed to the anchor 19, and the next bottom plate 16 is connected. is suspended, concrete is poured in from the inlet 20, and the side walls are constructed along with the inner bottom surface excavation.

In the above process, during concrete pouring, the U-shaped steel materials 9 and 10 act to prevent the lining plate 4 from expanding due to concrete pouring pressure, and after curing the concrete 21, the dowel materials 5, Furthermore, the strength of the construction part of the lining plate 4 can be increased by the tie bars 13 and 14 remaining on the side concrete underground wall 3.

In addition, although the above-mentioned embodiment is an embodiment of a method in which each side wall lining is constructed by a reverse winding method, it goes without saying that the method can also be applied to an embodiment in which a forward winding method is used.

Effects of the Invention> As described above, according to the invention of this application, the lining plate is used and attached as an inner formwork, and the side wall concrete is poured between it and the underground wall used as the outer formwork. By seal-welding the joints of the lining plates after curing, the side wall concrete and the lining plate can be integrally formed in one process, which eliminates the need for conventional multiplexing. Compared to the installation method using a step process, the construction period can be significantly shortened, and the reinforcing material of the lining plate can be used in stages, and the lining plate can be prefabricated as an inner formwork, making the work difficult. It is possible to reduce the number of workers and auxiliary equipment, and the excellent effect of significantly reducing the overall construction cost is achieved.

In addition, the thickness of the side wall concrete of the underground wall and the accuracy requirements for the construction position of the lining plate can be adjusted integrally and in relation to each other. Because it can be prefabricated, it has an excellent effect in terms of accuracy.Furthermore, since the side wall concrete placed between the underground wall and the lining plate is also poured in one process, its supporting strength is improved. In addition, as in the above-mentioned embodiment, support materials such as tie bars can be buried inside the side wall concrete, thereby further improving the support strength of the lining plate. Excellent effects can be achieved.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing one embodiment of the present invention, and part 1a
Figure 11b is a cross-sectional and plan view explaining the underground tank construction process;
FIG. 2 is an explanatory sectional view of the side wall concrete and lining plate during construction, and FIG. 3 is a partially enlarged sectional view of FIG. 2. 3... Underground wall, 9,10... Reinforcement material,
4... Lining plate, 13, 14...
...Tie bar, 1...Tank, 21...
··concrete.

Claims (1)

[Claims] 1. A method of constructing a side wall of a tank by installing an inner formwork on an underground wall and pouring concrete, in which the underground wall is used as an outer formwork and a removable reinforcing member is provided. A concrete formwork for constructing the tank side wall is formed by attaching a metal lining plate to the above-mentioned underground wall via tie bars, and then a bottom plate is set between the formwork and the above-mentioned underground wall via hanging tools. Then, concrete is poured into the space formed by the underground wall, the formwork, and the bottom plate to integrally connect the side wall concrete and the lining plate, and after the concrete hardens, the lining reinforcing material and the bottom plate are removed. A method of constructing a side wall of an underground tank, in which a side wall with a lining is constructed by sequentially repeating the steps. 2. The inner formwork consists of a lining plate made of a metal material with a removable reinforcing material installed externally, and has a dowel material on the side wall facing the concrete of the lining plate, a partition part in the middle part, and a nut with a female thread part on both sides. Along with fixing
Tie bars are screwed onto the nuts through holes drilled in the outer surface of the lining plate, the reinforcing material is fixed to the surface of the lining plate, and the block formwork is used as the inner formwork. A method of constructing a side wall of an underground tank according to claim 1, characterized in that: