JPH0432190B2 - - Google Patents

Description

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

[Prior art and problems to be solved by this invention]

Conventionally, when constructing this type of sewage treatment tank, the entire sewage treatment tank was constructed on-site, and the entire construction work, such as installing and demolishing the formwork, was complex, resulting in poor construction efficiency, making it difficult to construct, and expensive. There was a problem.

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 construct a cylindrical prefabricated tank that will serve as a sewage treatment tank in a short time and at low cost through simple assembly work, and to be able to build it strongly. The purpose is to provide a method.

[Means for Solving the Problems] The present invention is a method of constructing a cylindrical prefabricated tank on a foundation by interconnecting prefabricated blocks each having a shape in which a cylindrical tank is divided into a plurality of pieces in the generatrix direction. A through-hole is provided inside the upper and lower parts of each prefabricated block that communicates with each other along the circumferential direction, and a connecting fitting is provided in the opening that opens from the through-hole to the central outer surface of the prefabricated block. The other end of the connecting PC steel material is inserted into the through hole of the prefabricated block and fixed to one side of the connecting metal fitting provided on the block, and the other end of the connecting PC steel material is inserted into the through hole of the other prefabricated block, and the side wall of the connecting metal fitting provided on the block. The PC is made to protrude from the side wall of the other prefabricated block, and the tip of the tension material inserted into the through hole from the side wall of the other prefabricated block protrudes from the side wall of the connecting fitting.
After connecting the prefabricated block to the steel material and tensioning it with jacks from the side wall side of the prefabricated block, fix the other end of the prefabricated steel material to the connecting fitting, and assemble it into a cylindrical shape in this way to form a cylindrical tank. Two connecting PC steel materials are inserted, and each PC
One end of the steel material is fixed to a connecting fitting provided on the left and right adjacent prefabricated blocks, and the other end is used for fastening at an opening that opens to the outer surface of the block from a through hole provided in the last prefabricated block.
This is an attempt to solve the above problem by tension-fixing the PC steel material.

〔Example〕

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

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

Concentric cylindrical sewage treatment tank 1 which is a cylindrical pre-prepared tank
These are an inner sedimentation tank section 3 surrounded by a cylindrical inner wall 2 formed at the center, and an outer aeration tank section 5 surrounded by a cylindrical outer wall 4 formed around the outer periphery of the inner sedimentation tank section 3. It is made up of.

The inner wall 2 and the outer wall 4 are each formed by joining a plurality of prefabricated inner wall blocks 2a and outer wall prefabricated blocks 4a, 4a' into a cylindrical shape, which are each formed by dividing a cylindrical tank into a plurality of pieces in the generatrix direction. (See Figures 1 and 2) When constructing the processing tank 1 having such a configuration, first, a plurality of prefabricated outer wall blocks 4a are installed inside the upper and lower parts of the blocks so as to communicate with each other along the circumferential direction. PC inserted into the through hole 4c
They are tension-connected by steel members 6 and assembled into a cylindrical tank on a foundation 7, and are joined together by applying prestress in the circumferential direction from the outer surface of the tank to form the outer wall 4. (Refer to Figures 3 to 5) In addition, the tension connection with the PC steel material 6 is achieved by 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.
After inserting the PC steel material 6 into 4c from one side of the block, fix its end with a nut, and connect the other end with the tension material 20 inserted from one side of block 4a next to block 4a with a coupler 21, and tighten the tension. Attachment 1
3 to tension the PC steel material 6 and join the blocks 4a and 4a. Repeat the same steps below. (See Figures 4 and 6a and 6b) Here, the PC steel material 6 is stored in advance in the through hole 4c of each prefabricated block 4a for external walls, and is used to connect the prefabricated blocks for adjacent external walls to be connected. It is inserted into the through hole 4c of 4a and passed through.

In addition, two blocks are stored in the final outer wall prefabricated block 4a' when assembled to form the outer wall 4.
It is inserted into the through hole 4c of the prefabricated outer wall block 4a to be connected and passed through. . (Fig. 7, 8
9 and 10) The prestressing steel material 6 is tension-tightened alternately using tension fasteners 8 as shown in FIGS. 9 to 11.

A bottom plate 9 is placed on the internal foundation 7 surrounded by the next outer wall 4.
Concrete for the formation of the concrete is poured. At this time, the lower end of each prefabricated outer wall block 4a and the bottom plate 9 are connected by anchor members 10. (See FIGS. 3 and 5) Next, the plurality of inner wall prefabricated blocks 2a are assembled into a cylindrical shape by connecting the bottom plate 9 and the anchor bars 12. The inner wall 2 is formed by connecting the inner and outer parts with a nut (not shown).
(See Figures 12 and 13) Meanwhile, a joint material is injected into the joint surfaces of each of the prefabricated blocks 4a for external walls, and the joint surfaces of prefab blocks 2a, 2a for internal and external walls, as well as the prefab blocks 4a for external walls and the bottom plate 9 are injected. The inner wall prefab block 2a and the bottom plate 9 are sealed.
The construction of the treatment tank 1 is completed by filling the inner and outer corners of the tank with mortar. (See Figure 14) [Effects of the Invention] A plurality of prefabricated blocks are tension-connected using prestressed steel materials inserted into through holes in the blocks, and two prestressed steel materials are placed in the final assembled prefabricated block. After the final block is installed, two prestressed PC steel members are slid one by one onto adjacent blocks and fixed under tension, thereby providing a strong cylindrical prefabricated tank that can be easily and efficiently constructed.

If the cylindrical prefabricated tank of the present invention is used as the outer wall, it is possible to provide a concentric cylindrical sewage treatment tank that is easy to construct, efficient, and strong.

Therefore, the treatment tank of the sewage treatment facility can be constructed at low cost.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing a treatment tank constructed by the method of the present invention, FIG. 2 is a plan view, and FIG.
Figures 6 to 5 are process diagrams showing the state of construction of the outer wall.
Figures 11 to 11 are process diagrams showing how each prefabricated block is connected with prefabricated steel materials for the outer walls, Figures 12 and 13 are process diagrams showing how the inner walls are constructed, and Figure 14 is a process diagram showing the construction of the inner wall. FIG. 1... Concentric cylindrical sewage treatment layer, 2... Inner wall, 2
a... Inner wall prefabricated block, 3... Inner sedimentation tank section, 4... Outer wall, 4a, 4a'... Outer wall prefabricated block, 4b... Connection fittings, 4c... Through hole, 5... Outer aeration tank Part, 6...
PC steel material, 7... Foundation, 8... Tension fastener, 9...
... Bottom plate, 10 ... Anchor member, 12 ... Anchor reinforcement, 13 ... Connection fitting.

Claims (1)

[Scope of Claims] 1. A method of constructing a cylindrical prefabricated tank on a foundation by connecting prefabricated blocks each having a shape in which a cylindrical tank is divided into a plurality of pieces in the generatrix direction, comprising the steps of: A through hole is provided inside the upper and lower parts that communicate with each other along the circumferential direction, and a connecting fitting is provided in the opening that opens from the through hole to the central outer surface of the prefabricated block, and is inserted into the through hole of one of the adjacent prefab blocks. The other end of the connecting PC steel material fixed to one side of the connecting fitting provided on the block is inserted into the through hole of the other prefabricated block so that it protrudes from the side wall of the connecting fitting provided on the block, and The tip of the tension material inserted into the through hole from the side wall of the block is connected to the prestressed steel material protruding from the side wall of the connecting metal fitting, and after being tensed by jacking from the side wall of the prefabricated block, the other end of the prestressed steel material is fixed to the connecting metal fitting. However, in the final prefabricated block that is assembled into a cylindrical shape to form a cylindrical tank, there are two connecting holes in the through hole.
The prestressed steel material is inserted, one end of each prefabricated steel material is fixed to the connecting fitting provided on the left and right adjacent prefabricated blocks, and the other end of each prefabricated steel material is inserted through the through hole provided on the last prefabricated block to the outer surface of the block. A method for constructing a cylindrical prefabricated tank, characterized in that a PC steel material for fastening is tension-fixed in an opening to be opened.