JPS63308187A - Method of constructing circular prefabricated tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method for constructing a circular prefabricated tank such as a concentric sewage treatment tank in a small-scale sewage treatment facility installed for treating sewage. .

[Prior art and problems to be solved by the present invention] Conventionally, this type of sewage treatment tank has been constructed entirely on-site, and the entire construction work, such as installing and demolding the formwork, has been carried out on-site. The problem was that it was complicated, had low construction efficiency, was not easy to construct, and was expensive.

Therefore, sewage treatment tanks cannot be installed in small-population areas that cannot afford large construction costs.

Therefore, in order to complete sewage treatment facilities, a sewage treatment tank that can be easily and inexpensively constructed has been desired.

This invention was developed in view of the above-mentioned circumstances, and its purpose is to provide a method for constructing a circular prefabricated tank to serve as a sewage treatment tank in a short time and at low cost through simple assembly work, and also to ensure a strong structure. Our goal is to provide the following.

[Means for solving problems]

The circular prefabricated tank serving as the sewage treatment tank of the present invention is assembled into a circular shape by connecting a plurality of arcuate prefabricated blocks under tension using prestressed steel members provided on each block.

Then, two PC steel materials are placed on the final arc-shaped prefabricated block, and after this final block is installed, two PCW4 materials are slid onto each adjacent block and fixed under tension.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments.

Note that this example is an example of a processing tank in which the outer wall is a circular prefabricated tank according to the present invention.

The concentric sewage treatment tank 1, which is a circular prefabricated tank, has an inner sedimentation tank part 3 surrounded by a circular inner wall 2 formed at the center, and a circular outer wall 4 formed around the outer periphery of the inner sedimentation tank part 3. Outer airage tank section 5 surrounded by
It consists of

The inner wall 2 and the outer wall 4 are each formed by joining a plurality of arcuate inner wall prefab blocks 2a and outer wall prefab blocks 4a, 4a' in a circular shape. (See Figures 1 and 2) When constructing the treatment tank 1 having such a configuration, first, a plurality of prefabricated outer wall blocks 4a are tension-connected using the PCP material 6 provided therein, and a foundation is constructed. The outer wall 4 is formed by assembling the outer wall 4 into a circular shape on the outer wall 7 and joining them together by applying prestress in the circumferential direction. (See Figures 3 to 5) In addition, the tension connection with the PC steel material 6 can be made from one side of the block 4a using the connecting fittings 4b provided at the upper and lower parts of the lateral center position of the prefabricated block 4a for the outer wall. P in 4c
After inserting the Cp material 6, its end is fixed with a nut, and the other end is connected to the tension material 20 inserted from one side of the block 4a next to the block 4a with a coupler 21, and using the tension fastener 13. The PC steel material 6 is tensioned and the blocks 4a are joined together. Repeat the same steps below,
(Refer to Figs. 4 and 6 (al and in Fig. 6)) Here, the PCQ material 6 is stored in advance in the through hole 4c of each prefabricated block 4a for external walls, and is used for adjacent external walls to be connected. It is inserted into and penetrated into the through hole 4c of the prefab block 4a.

Further, two blocks are stored in the final prefab block 4aW for an outer wall when assembled to form the outer wall 4, and are inserted into the through holes 4c of the prefab blocks 4a for the outer wall to be connected. (See Figures 7, 8, 9, and 1O) The tension and tightening of each PCIII material 6 is shown in Figures 9 to 9.
As shown in FIG. 11, this is done alternately using tension fasteners 8.

Next, concrete for forming the bottom slab 9 is placed on the foundation 7 inside the outer wall 4. At this time, the lower end of each external wall prefab block 4a and the bottom plate 9 are connected to the anchor member I.
Connected by O. (See Figures 3 and 5) Next, a plurality of inner wall prefabricated blocks 2a are connected to the bottom plate 9 and anchor bars 12 and assembled into a circular shape.
Connecting fittings 13 and bolts each provided on its own
The inner wall 2 is formed by connecting the inner and outer parts with a nut (not shown). (See FIGS. 12 and 13) Meanwhile, a joint material is injected into the joint surfaces of each prefabricated block 4a for external walls, and each prefabricated block 2a, 4
Prefabricated block 4a and bottom plate 9 for joint surface and outer wall of a
The construction of the processing tank 1 is completed by filling the corners of the inner wall prefabricated block 2a and the bottom plate 9 with mortar. (See Figure 14) [Effects of the Invention] A plurality of arcuate prefabricated blocks are tension-connected using prestressed steel materials provided on each one, and two prestressed steel materials are provided in the final assembled arcuate prefab block. Keep it
After installing this final block, two PC steel members are slid one by one onto adjacent blocks and fixed under tension, thereby providing a strong circular prefabricated tank that can be easily and efficiently constructed.

If the circular prefabricated tank of the present invention is used as the outer wall, a concentric circular sewage treatment tank that is easy to construct, efficient, and strong can be provided.

Therefore, it can be used as a treatment tank in a small-scale sewage treatment facility used for circulation with a small population, without any problems in terms of cost and strength.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a processing tank constructed by the method of the present invention, Fig. 2 is a plan view, Figs. 3 to 5 are process diagrams showing the state of construction of the outer wall, and Figs. Figure 12 is a process diagram showing how each outer wall prefabricated block is connected with PC steel. 1... Concentric sewage treatment tank, 2...
Inner wall, 2a... Inner wall prefabricated block, 3...
...Inner sedimentation tank section, 4...Outer wall, 4a
, 4a'...Outer wall prefabricated block, 4b...
...Connection fitting, 4C...Through hole, 5...
...Outer aeration tank section, 6...P
Cl4 material, 7...Foundation, 8...Tension fastener, 9...Bottom plate, 1o...Anchor part, 12...・Anchor muscle, 13...
Connecting fittings. Figure 1 Figure 2 Figure 9 Figure 10 Figure 11 [J °°・66

Claims (1)

[Scope of Claims] A plurality of arcuate prefabricated blocks are assembled into a circular shape by tension-connecting adjacent prefabricated blocks using prestressed steel material disposed on each of the prefabricated blocks, and the final arcuate prefabricated block is assembled with the aforementioned PC steel. This method of constructing a circular prefabricated tank is characterized in that two steel members are arranged, and after the final block is installed, two prestressed steel members are slid onto adjacent blocks one by one and fixed under tension.