JPS62174466A - Method for assembling circular water 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] [#: Industrial field of application j Unreleased 1jl relates to a method for constructing a circular water tank used as a sedimentation basin or water storage tank in a sewage treatment plant.

L. Prior Art Conventionally, this type of circular aquarium has generally been constructed using so-called cast-in-place concrete. As a result, on-site formwork work and reinforcing bars were in short supply.
This is causing work to become chained. Therefore, it has become a hot topic that it is difficult to shorten production times and reduce costs, and that there are certain limits to quality control.

Therefore, recently, a structure in which a cylindrical peripheral wall is constructed by arranging a plurality of retaining wall blocks, which are secondary concrete products, in the circumferential direction has been considered.

That is, this circular aquarium is a circular aquarium comprising a cylindrical peripheral wall formed by arranging a plurality of retaining wall blocks in the circumferential direction, and a bottom plate continuous to the base of the peripheral wall. A connecting box is provided in at least one of the retaining wall blocks, and an insertion hole communicating with the connecting box is provided inside each retaining wall block, and a PC steel material is inserted into the insertion hole at both ends thereof. The screw portions are positioned and inserted into the connection box, and nuts are screwed into the screw portions at both ends of the PC steel material to tightly connect the retaining wall blocks to each other.

[Problem to be solved by the invention J] However, in the conventional method, the connecting box is buried in concrete at the same time as the retaining wall block is manufactured, so the outer surface of the connecting box is is 7g in close contact with the concrete structure. Therefore, when the nut is tightened to apply tension to the prestressing steel material, problems are likely to occur, that is, when tension is applied to the prestressing steel material.

Tensile force also acts on the connection box that connects these PC steel materials. Therefore, even when the connecting box is made of metal, a small amount of elongation occurs depending on the tensile force. Then, due to the elongation, a force is applied that tries to expand the concrete structure of the portion of the retaining wall block that surrounds the connection box, resulting in a partial lack of strength in the retaining wall block. To explain specifically,
As shown in Fig. 15, a compressive force based on the tension of the prestressing steel material C acts on the concrete texture portion I that does not correspond to the connecting box b of the retaining wall block a, but
A tensile force may be applied to the concrete texture portion H corresponding to , due to the elongation of the binding box b. Therefore, cracks and the like are likely to occur in this portion H, causing problems in durability.

The present invention aims to solve the above problems all at once.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for assembling a circular aquarium as described above in which a plurality of retaining wall blocks are tightly connected using prestressed steel. The hook is housed in a recess provided in the retaining wall block,
At the time of storage, an edge layer is provided between both circumferential end surfaces of the connection box and the corresponding inner wall surface of the recessed portion, and this is caused when tension is applied to the PC'lJ4 material. It is characterized in that the elongation of the connecting box in the circumferential direction is absorbed by the edge cutting layer.

First, for a circular aquarium like this, the surrounding wall can be constructed by combining multiple retaining wall blocks on-site, so there is no need for large-scale formwork work 11 for constructing the surrounding wall.
No need for G or steel reinforcement water. Moreover, each! Since the wall blocks are tightened and firmly connected by the prestressed steel, there is no possibility that the retaining wall blocks will be misaligned due to uneven earth pressure, etc., and the tightening by the prestressed steel prevents the insertion of each block. This can be done by positioning both ends of the PC steel material inserted into the hole in the connection box and fixing fittings such as nuts to each end, making it easy to connect the retaining wall blocks together. be.

Moreover, when assembling such a circular aquarium, a cutting layer is provided between both circumferential end surfaces of the connecting box and the inner wall surface of the recessed portion that accommodates the connecting box, so that
Even if the connecting box is elongated in the circumferential direction by applying tension to the steel material, the elongation is equal to the edge ν1.
It will be absorbed into the layer. Therefore, i! It is possible to suppress or prevent concentrated tensile force due to the tension of the PC steel material from acting on the concrete texture portion of the retaining wall block corresponding to the I-connection water box.

``Example'' Hereinafter, an example in which the present invention is applied to a circular water tank used as a first sedimentation tank or a final sedimentation tank in a sewage treatment plant will be described with reference to FIGS. 1 to 11.

FIG. 1 is a plan sectional view showing an assembled circular aquarium, and FIG. 2 is a front sectional view thereof. As shown in these drawings, this circular water tank includes a plurality of retaining wall blocks 11 to 19.
a cylindrical peripheral wall 2 formed by arranging them in the circumferential direction;
A bottom plate 3 is provided continuously to the base portion 2a of the peripheral wall 2.

As shown in FIG. 3, each retaining wall block 11 to 19 is a curved plate-shaped concrete block with a fan-shaped planar cross section, and has a flange 4 at its base 2a corresponding to the thickness of the bottom slab 3. are doing. In addition, each retaining wall block 11 to 19
The centers of curvature of the inner circumferential surface 1a and the outer circumferential surface ib are on the center line n of the circular water tank, and when the left and right joining end surfaces 5 and 6 are extended, they are set so that they intersect on the center line n. be. Therefore, by joining these retaining wall blocks II to 19, a perfectly circular peripheral wall 2 is formed. As shown in FIGS. 4 and 5, two parallel seal grooves 7 are provided on one joint end surface 5 of each retaining wall block 11 to 19, extending from one end to the other end. A seal material 8 made of water-inflated rubber is attached to each of these seal grooves 7. In addition, each retaining wall block 11 to 1
As shown in FIG. 3, FIG. 10, and FIG. By embedding the sheath, a curved insertion hole 11 is provided that communicates with each connection box 9 and opens the box 9 to each of the joint end surfaces 5 and 6. Various holes 1 in retaining wall block 1
1 and each can match. In each of these insertion holes 11, a PC steel rod 1, which is a PCJll material, is inserted.
2 is inserted. Each PC steel bar 12 is a steel bar having threaded portions 12a and 12b at both ends, and the threaded portion 12a formed at one end is attached to a specific retaining wall block l! ~19
The threaded portion 12b formed at the other end is connected to the specific retaining wall block 11 to
It is located in the connecting box 9 of the retaining wall blocks 11 to 19 adjacent to the retaining wall block 19. Then, in the connecting box 9, a nut 14 serving as a locking device is screwed into each of the threaded portions 12a and 12b via an anchor plate 13, and this nut 14 is tightened to apply tension to the PCgIilJ412, thereby applying tension to the PCgIilJ412. Retaining wall blocks 11 and 12.12 and 13...j18 and 19. IQ and 11 are tightly connected.

By the way, the detailed method of assembling such a circular water tank is as follows. First, recesses 15 that communicate with the various through holes 11 are provided on the outer surface of each of the retaining wall blocks 11 to 19, and the connection boxes 9 are accommodated in each of these recesses 15, respectively. That is, the connection box 9 has i! It is cylindrical and has a through hole 16 through which M is connected, and the recessed portion 1 is placed with the opening surface facing outward.
5 is loosely fitted. In this case, there is an edge between the circumferential end surfaces 9a+, 9tz of the connection box 9 and the inner wall surfaces 15a, 15b of the recess ff1t517). , IJ layer 17 is formed on the edge cutting layer 1 of this embodiment.
7 is constituted by an easily deformable solid layer, for example, a rubber layer, as shown in FIG. 1O. Then, such retaining wall blocks 11 to 19 are sequentially connected in the circumferential direction to construct the peripheral wall 2. More specifically, as shown in FIGS. 6 and 7, first, the second retaining wall block 12 is guided next to the first retaining wall block 11 by a partially arc-shaped guide member 18. Arrange while doing so. Then, insert the PCtJ4 rod 12 into each insertion hole ti, and each of the PC steel rods 1
Connect the threaded part 12a at one end of 2 to the retaining wall block 1 at the first opening.
The screw portion 12b on the other end side is made to protrude into the connection box 9 of the retaining wall block 12 of No. 2 1].

Then, a nut 14 is fixed to the threaded portion 12a formed at one end via the anchor plate 13, and a nut 14 is temporarily fixed to the threaded portion 12b formed at the other end via the anchor plate 13. Next, in each connecting box 9 of the retaining wall block 12 of No. 2 [1], as shown in FIG. Jack 1
9, and with these hydraulic jacks 19 applying tension to each PC steel rod 12 at the same time, tighten each PC steel rod 12.
The nuts 14 temporarily fastened to the threaded portion 12b at the other end are fully tightened and fixed, and then each hydraulic jack 19 is taken out of the connection box 9.The hydraulic jacks 19, as shown in FIG. A piston 23 is integrally provided on the outer periphery of an operating shaft 22 having a hole 21, and the piston 23 is slidably fitted into a cylinder 24, with both ends of the operating shaft 22 being exposed outside the cylinder 24. Then, pressure oil can be introduced to one end surface side of the piston 23 via an oil guide boat 25, and
The other end surface of the piston 23 is pressed by a return spring 26. A core member 29 having a screw hole 27 at the tip and a flange 28 at the base end is rotatably inserted into the center hole 21 of the operating shaft 22, and the PC is inserted into the screw hole 27 of the core member 29. Threaded portion 12 of steel rod 12
b can be screwed together. Therefore, when using this hydraulic jack 19, the anchor plate 1
The PC
dR-i of m rod 12! -18Xi12b and core material 29 are screwed together.

After that, pressure oil is introduced into the oil 4 inlet/outlet port 25, the piston 23, the operating shaft 22, and the core member 29 are moved back, and the PC steel rod 12 is pulled. In this state, a wrench (not shown) is inserted into the space 31 formed by the spacer 32 from the outside.
, and fully tighten the nut 14. Thereafter, the pressure in the oil guide port 25 is released and the piston 23 and the operating shaft 22 are moved forward by the biasing force of the spring 26, thereby freeing the core member 29 and screwing it off from the PC steel rod 12. Then, the hydraulic jack 19 and spacer 32 are taken out of the connection box 9.

The first retaining wall block 11 and the second retaining wall block 12 are tightly connected by the following procedure.
Second retaining wall block 12 and third retaining wall block 1
3. 3rd retaining wall block 13 and 4th retaining wall block 14 ・Kist・No. 8 1" retaining wall block 18 and 9th retaining wall block
The th (last) retaining wall block 19 is also connected by the same procedure. Furthermore, the last retaining wall block and the first retaining wall block 11 are connected in the same manner. Note that since the guide member 18 described in iii is made in a shape having a curvature corresponding to the peripheral wall 2, the retaining wall block 11 is slid along the guide member 18 while sequentially sliding the guide member 18 in the circumferential direction. ~18 to 11
If you enter the next line and connect it.

Finally, retaining wall block 19 and the first retaining wall block l!
will match exactly.

In this way, when all the retaining wall blowers 11 to 19 are tightly connected by the PC steel rods 12, these PC
Due to the tension of the steel rod 12, a tensile force acts on each connecting box 9 in the circumferential direction, causing elongation in the circumferential direction, but the elongation of each connecting box 9 is absorbed by the deformation of the edge 1 layer 17. It is now possible to do so. And a PC like this
After all the tightening with the steel rod 12 is completed, the insertion hole 1 is inserted from the injection hole 13a provided in the anchor plate 13.
Grout (not shown) is injected into the connecting box 9, and mortar (not shown) is filled into the connecting box 9.

On the other hand, the bottom slab 3 is made by pouring concrete between the tips of the flanges 4 of the retaining wall block 1, and has a central part for mounting a stirring device (not shown), etc. It has a recess 3a.

In addition, 33 is foundation chestnut stone, 34 is foundation concrete, 35
36 is the mortar, and 36 is the reinforcement.

With this kind of configuration, multiple retaining wall blocks l
By combining these on-site, the circumference IM2 can be created, so large-scale formwork work IG for constructing one circumference wall is required.
This eliminates the need for reinforcing steel work and greatly reduces the complexity of on-site work. In addition, since the retaining wall block l can be manufactured in a factory or the like using a highly productive method, one quality control can be carried out in one minute, and the dimensional accuracy is high, making it easy to reduce costs. This makes it possible to provide a circular aquarium. Moreover, since each retaining wall block 1 is tightly connected by the PC steel rods 12, there is no possibility of positional shift due to uneven earth pressure, etc. that acts during the above-mentioned backfilling work. Said P
Tightening with the C steel rod 12 is performed through the insertion hole 1 of each *q block l.
Both end screw portions 12a, 12b of the PC steel rod 12 inserted into the
is located in the connecting Bogges 9, and its threaded part 1
This can be done by screwing the oaks 14 to 2a and 12b, so 1 of the retaining wall block 1 comrades! [! Sweetfish is also easy and does not make the task complicated.

Moreover, both circumferential end surfaces 9a1.9 of the connection box 9
bi and the corresponding inner wall surface 15a of the recess fi15
, 15b is provided, and the elongation in the circumferential direction of the connecting box 9 caused when tension is applied to the PC steel rod 12 by tightening the oak 14. is absorbed into the edge cutting layer 17, and as a result of elongation of these connecting boxes 9, the concrete structures of the retaining wall blocks 11 to 1q are strongly pressed in the left and right direction by the end faces of the connecting boxes. Therefore, it is possible to effectively prevent the inconvenience that a large tensile force is applied to the portion of the retaining wall block that corresponds to the connection box. Therefore, 1 PC steel rod is applied to the entire area and all joints of all retaining wall blocks.
Applying a compressive force based on the tension of 2 is rIT fE
Therefore, it is possible to construct a highly durable circular aquarium that does not leak water.

By the way, as a connecting member for connecting PC steel bars without applying tensile force to the concrete structure of the retaining wall block, a turn/heracle-shaped connector having female threads at both ends is known. However, since such connectors require alignment of the PC steel bars to be connected,
It is impossible to connect curved PC steel rods.

On the other hand, if the connecting box 9 is used as a connecting member as in the present invention, the PC steel rods 12 can be connected to each other without centering. Therefore, a plurality of concrete blocks forming a cylindrical body, that is, the retaining wall block once and seven times, can be reliably and IP! It is possible to simply concatenate.

In addition, in the following embodiments, the case where the edge cutting layer is an easily deformable solid layer composed of rubber or asphalt-based inclusions, etc. has been described, but the present invention is not necessarily limited to such a layer. , for example, flow 177 of grease, etc.
It may be a layer formed by a liquid, an air layer 1 whose width has only air, or a layer formed by combining these (/J, body layer, liquid layer, and air layer) as appropriate. (You can also use it as a cut layer).

Furthermore, in the above embodiments, the case where the present invention is applied to a circular aquarium having a circumferential wall is explained, but the present invention is not limited to such a tank. Similarly, the present invention can be applied to a circular aquarium having a plurality of peripheral walls. That is, what is shown in FIGS. 12 and 13 is a circular water tank used as a treatment tank in a small-scale sewage treatment facility or the like. Therefore, this circular aquarium has a double interior structure comprising a cylindrical inner wall A and a cylindrical outer wall B surrounding this inner wall A, and the inner space of the inner wall is filled with sediment. In addition to being used as a pond C, an annular space formed between the inner wall A and the outer wall B is used as an aeration tank D.

The inner wall A is formed by arranging a plurality (m) of retaining wall blocks IA+ to IA, which are connecting blocks, in the circumferential direction. connected by rods. Also, the outer wall B is a block for connecting multiple A4V4 (n pieces)! ! It is formed by arranging four wall blocks IBI to lBn in the circumferential direction, and P(Jl
Water is constructed using sticks.

In general, it goes without saying that the number and shape of retaining wall blocks to be combined are not limited to those shown in the example shown in the drawings, and can be modified in various ways without departing from the spirit of the present invention.For example, as shown in FIG. 7 langes 104 protruding toward the inner circumference.
Similarly, it is also applicable to a retaining wall block 101 integrally having a flange 105 and a flange 105 protruding toward the outer circumference.

Furthermore, the PC steel material is not limited to a steel bar, and may be a strand, for example. However, in the case where the PCMll material is a strand, it is difficult to form a threaded portion at the end thereof, so a nut is used. For example, other fixing devices other than Natsu may be fixed, such as:
A ring-shaped cone that loosely fits around the outer periphery of the end of the PC steel material, and a grip 2 having a wedge-shaped cross section that is driven between the inner periphery of the cone and the PC steel material to grip the PCMI material. Possible examples include those consisting of the following.

Further, the connection box may be fitted into the retaining wall block with an opening formed on the inner circumferential surface of the retaining wall block.

Effects of the Invention J As described in detail above, the circular aquarium obtained by the present invention has a plurality of circumferential walls. Since it is constructed from liI wall blocks, it is possible to eliminate the complexity of on-site work, shorten the construction period and reduce costs. In addition, since the retaining wall blocks are connected using prestressed steel, there is no inconvenience caused by displacement of the retaining wall blocks during backfilling, etc., and this PCfI
For connection using 4 materials, connect the PC located inside the connection box.
Assembly is extremely easy as it is completed by fixing fasteners to each end of the steel material. Moreover, when assembling such a circular aquarium, the connecting box is housed in the recess of the retaining wall block, and when the connecting box is housed, both circumferential end faces of the connecting box and the corresponding recess are An edge cutting layer is provided between the inner wall surface 1
Since the elongation in the circumferential direction of the connecting box caused when tension is applied to the prestressed steel material is absorbed by the edge cutting layer, J! # corresponding to the binding box
l It is possible to eliminate the inconvenience of tensile force acting on the concrete structure of the wall block. Therefore, the excellent effect of preventing the occurrence of cracks and the like and effectively improving the durability of the peripheral wall can be obtained.

[Brief explanation of drawings]

1 to 11 show one embodiment of the present invention.
The figure is a sectional view, FIG. 2 is a front sectional view, FIG. 3 is a perspective view of the retaining wall block, and FIG. 4 is a sectional view taken along line A-A in FIG. 1.
Figure 5 is an enlarged sectional view taken along line B-B in Figure 4, Figure 6 is a perspective view for explaining the method of joining retaining wall blocks, Figure 7 is a cross-sectional view of the same, and Figure 8. Figure 9 is a front view of the connecting box part to explain the method of applying tension to the PC steel material, and Figure 9 is an enlarged partially cutaway front view showing the hydraulic jack used to apply tension to the PCM material. 1O diagram is a cross-sectional view of the connection box immediately after connection, il1
The figure is a front view of the same. 12 and 13 show other embodiments, with FIG. 12 being a plan view and FIG. 13 being a front sectional view. FIG. 14 is a perspective view showing still another embodiment of the present invention. FIG. 15 is an explanatory diagram showing a conventional example. 11 ~ lq, IAI ~ IAs,
lB+ N IBn・Participation retaining wall block la...Inner peripheral surface 1b@-・Outer peripheral surface 2...Clear peripheral wall
2a...Base 3...Bottom plate 3a dispute・
・Concave portion 4n・Flange 5.6...Joining end surface 7...Φ seal groove 8...e sealing material 9...Connection port 2x 9a, 9b@Φ・End wall 9 al, 9 bl a * a End face 11・φ・
Insertion hole 1211...PC steel material (PCf14 bar) 12a, 12b
...Threaded portion 13...Anchor plate 13a semi-I self-injection port 14...1 nut 15...Concave portion 15a, 15be**Inner wall surface 16...Through hole 17...・Edge cutting layer l8...Guide member 19...Hydraulic jack 21・Base・Center hole 22---Operating shaft 23---Piston 2411...
Cylinder 25...Oil guide port 26...Return spring 27...@Screw hole 28/Flange 29...Core material 31...Space 32...11 Spacer 33/0 foundation stone 34・-・
ノ^ Foundation concrete 3511... mortar 36... insert reinforcement 101...-! II [Wall block 104.105...Flange

Claims (4)

[Claims] (1) At least one of the plurality of retaining wall blocks arranged in the circumferential direction and forming a cylindrical peripheral wall is provided with a concave part to accommodate a connecting box therein, and each of the retaining wall blocks is An insertion hole is provided inside to pass through the connection box, and a PC steel material is inserted into this insertion hole with both ends positioned inside the connection box.
A method of assembling a circular water tank in which the retaining wall blocks are tightly connected to each other by fixing fasteners to both ends of the C steel material, and when the connecting box is accommodated in the recessed part,
An edge cutting layer is provided between the circumferential end face of the connection box and the corresponding inner wall face of the recessed part, and the P
A method for assembling a circular aquarium, characterized in that the elongation of the connecting box in the circumferential direction caused when tension is applied to the C steel material is absorbed by the edge cutting layer. (2) The method for assembling a circular aquarium according to claim 1, wherein the edge cutting layer is an air layer. (3) The method for assembling a circular aquarium according to claim 1, wherein the edge layer is a layer of flowable liquid. (4) The method for assembling a circular aquarium according to claim 1, wherein the edge cutting layer is a solid layer that is easily deformable.