WO2011024267A1

WO2011024267A1 - Method of manufacturing rainwater containing tank

Info

Publication number: WO2011024267A1
Application number: PCT/JP2009/064874
Authority: WO
Inventors: 和久清水
Original assignee: 旭コンクリート工業株式会社
Priority date: 2009-08-26
Filing date: 2009-08-26
Publication date: 2011-03-03

Abstract

A method of manufacturing a rainwater containing tank (C) is configured such that beam blocks (31) are laid between pillars (3) and between side walls (1) and the pillars (3), the beam blocks (31) are temporarily fixed to the pillars (3) and to the side walls (1) by prestressing steel members (P), all the beam blocks (31) butted against each other in the longitudinal direction thereof are prestressed by prestressing steel strands (ST), and then the prestressing steel members (P) are finally tightened to fasten the beam blocks (31) between the side walls (1) and the pillars (2).

Description

Rainwater storage tank manufacturing method

The present invention relates to a method for manufacturing a rainwater storage tank that is preferably used for temporarily storing rainwater in order to prevent damage such as inundation caused by a large amount of rainwater flowing into rivers and sewers during heavy rain.

Conventionally, with the expansion of urbanization such as land use corresponding to population concentration and road surface development, the water retention and recreational functions originally possessed by the land are significantly impaired, resulting in an increase in the amount of rainwater outflow and sewerage facilities And the discharge capacity of the discharge river is exceeded, causing problems such as inundation damage. In order to solve this problem, a rainwater storage tank is disposed underground and its upper surface is used as an artificial base. Conventional underground buried rainwater storage tanks are constructed entirely from cast-in-place concrete, or box-shaped precast box culverts are arranged close to each other in parallel, or slabs are placed between them at intervals. It was built by that.

By the way, in order to store a large amount of rainwater on a limited site, it is necessary to reduce the walls in the rainwater storage tank. In a structure in which precast box culverts are arranged close to each other in parallel or slabs are placed at intervals, a continuous wall is formed in the rainwater storage tank, and efficient storage is not possible. When a wall is formed, work efficiency such as heavy machinery cannot be used to remove earth and sand that flows into the tank together with rainwater and collects at the bottom, and the work efficiency is significantly reduced. In the case of construction using cast-in-place concrete, the column / beam structure is adopted to increase the storage efficiency, and maintenance work such as sediment discharge and cleaning can be performed relatively efficiently. The burden on the environment such as residents' lives and traffic obstruction becomes a problem.

In order to deal with such problems, a conventional column / beam structure has been adopted, and the outer wall, columns, beams, and top slabs are blocked into multiple types of precast, enabling efficient storage. At the same time, various rainwater storage tanks that can perform maintenance work and shorten the construction period have been developed (see, for example, Patent Document 1).

However, these blocks have a single reinforced concrete structure or a prestressed concrete structure, and mechanical assemblies such as FD grips and splice sleeves are used for assembly. Therefore, further improvement is desired in order to construct a rainwater storage tank that cannot introduce appropriate prestress to the entire long beam and has a safe and reasonable strength.

Japanese Patent No. 2543667

The present invention has been made paying attention to the above circumstances, and has a rainwater storage tank that employs a column / beam structure and blocks outer peripheral walls, columns, beams, and top slabs into multiple types of precast. It aims to solve the above-mentioned problems.

That is, the manufacturing method of the rainwater storage tank of the present invention includes a side wall formed by joining a plurality of blocks, and a plurality of columns arranged in a row in a water storage space surrounded by the side wall. A plurality of beam blocks which are installed between the columns and between the columns and the side walls and are joined to the beam support surfaces of the columns or the beam support surfaces of the side walls using PC steel. A beam formed by joining in the longitudinal direction, a bottom plate having a peripheral edge continuous with a lower end portion of the side wall, and a span between the beams and between the beam and the side wall so as to form the water storage space between the bottom plate and the bottom plate. A rainwater storage tank comprising a top slab, wherein the beam blocks are horizontally mounted between the columns and between the side walls and the columns, and the beam blocks are Temporarily fastened to the pillar and side wall with PC steel Then, pre-stress is introduced into all beam blocks that face in the longitudinal direction using PC steel strands, and then the PC steel material is finally tightened so that the beam blocks are placed between the side walls and the columns. It is characterized by being tightly coupled.

In such a case, a plurality of beam blocks temporarily fixed on the columns and the side walls are tightly coupled in the longitudinal direction with PC steel wires, so the beams are not restrained by the columns and the side walls. The blocks can be fastened together, and prestress corresponding to the design value can be introduced over the entire length inside the entire beam. Furthermore, since the entire beam that has become a prestressed concrete structure in this way is securely connected to the side walls and pillars by tightening the PC steel bar, a rainwater storage tank having a safe and reliable strength can be provided. Can be built.

In order to further increase the overall strength and more reliably prevent external groundwater from leaking into the storage space, the side wall is formed between a corner wall block that forms a corner of the water storage space, and the corner wall block. It is constructed using the intermediate wall block disposed in the column wall block between the intermediate wall block at the required location or between the intermediate wall block and the corner wall block and supporting the end of the beam, After connecting each block with PC steel, pre-stress is introduced into the two corner wall blocks and all the blocks arranged between the two corner blocks using PC steel strands. Good.

In the case where the column is a column block that is connected to the bottom plate and a column block that is erected on the column block using PC steel, the column is formed using the PC steel. The block is temporarily fixed on the column base block, and the beam block is temporarily fixed to the upper upward surface of the column block using a PC steel material, and then the PC is applied to all the beam blocks that face in the longitudinal direction. Desirably, prestress is introduced using a steel strand, and then the PC steel material is finally tightened to tightly connect the beam block to the column block, and the column block is tightly coupled to the column base block. .

As a preferable configuration of the rainwater storage tank, the side wall has a first flat wall portion formed between the first corner wall block and the second corner wall block, and a right angle to the first flat wall portion. And a second flat wall portion formed adjacent to and formed between the first corner wall block and the third corner wall block, and facing the second flat wall portion, the second corner wall. A third flat wall portion formed between the block and the fourth corner wall block; and the fourth corner wall block and the third corner wall block adjacent to the third flat wall portion. What comprises other flat wall parts formed in between is considered. As a preferable construction order of such a rainwater storage tank, the first corner wall block is placed at a reference position, and the first flat wall portion and the second flat wall portion are defined based on the corner wall block. As each of them is constructed, the construction of the third flat wall portion is advanced after the completion of the first flat wall portion, and each time the column wall block of the third flat wall portion is installed, A plurality of columns are erected in a row between the column wall blocks of the second flat wall facing the column wall block, and the beams are erected sequentially on the columns, and finally the other Mention what completes the wall.

As described above, according to the present invention, since the column / beam structure blocked by precast is adopted, the construction period can be shortened and a rainwater storage tank that can be easily mechanized for maintenance work can be constructed. Of course, since appropriate prestress can be introduced into the blocked beam, a rainwater storage tank having a safe and reasonable strength can be realized.

The schematic exploded perspective view of the rainwater storage tank which is one embodiment of the present invention. The disassembled perspective view which shows the side wall in the same embodiment. Sectional drawing which shows the connection structure of the intermediate wall blocks of the side wall in the embodiment. Sectional drawing which shows the connection part of the pillar in the same embodiment, a beam, a top slab, and a bottom board. Sectional drawing which shows the connection part of the pillar in the same embodiment, a beam, and a pillar wall block. The schematic plan view of the state except the top plate slab in the same embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 1, 2, and 6, the rainwater storage tank C includes first, second, and third flat wall portions, and other flat wall portions, that is, the fourth flat wall portion in the present embodiment. A side wall 1 having 1a, 1b, 1c, and 1d, a plurality of columns 2 arranged in a row in a water storage space R surrounded by the side wall 1, and a space between these columns 2 and a column 2 And a plurality of beam blocks 31 respectively joined to the beam support surface 22a of each column 2 or the beam support surface 136a of the side wall 1 using the PC steel material P. Are joined to each other in the longitudinal direction, a bottom plate 4 having a peripheral edge continuous with the lower end of the side wall 1, and the water storage space R between the beams 3 and the bottom plate 4. A top slab 5 is provided between the beam 3 and the side wall 1.

As shown in FIG. 2, the side wall 1 includes a corner wall block 11 that forms a corner of the water storage space R, an intermediate wall block 12 disposed between the corner wall blocks 11, and an intermediate wall block at a required location. It is constructed using a column wall block 13 that is disposed between 12 or between the intermediate wall block 12 and the corner wall block 11 and supports the end of the beam 3. That is, as shown in FIG. 6, by arranging a plurality of intermediate wall blocks 12 between the first corner wall block 11a and the second corner wall block 11b, the first flat wall portion 1a is arranged. The intermediate wall block 12 and the column wall block 13 are densely disposed between the first corner wall block 11a and the third corner wall block 11c, whereby the second flat wall portion 1b is formed. Is formed. Further, the third flat wall portion 1c is formed by densely arranging the intermediate wall block 12 and the column wall block 13 between the second corner wall block 11b and the fourth corner wall block 11d. The fourth flat wall portion 1d is formed by densely arranging a plurality of intermediate wall blocks 13 between the third corner wall block 11c and the fourth corner wall block 11d.

The corner wall block 11 is made of precast concrete, has a substantially L shape in plan view, and has a foot portion 111 continuous to the bottom plate 4 at a lower end portion. A connection box 112 is formed on the inner surface and the rear surface of the corner wall block 11, and PC steel material insertion holes 113 communicating with the connection box 112 are formed on both side end surfaces. Further, an upper upward surface 114 for supporting the top slab 5 is provided on the upper end side of the corner wall block 11.

As shown in FIGS. 2 and 3, the intermediate wall block 12 is made of precast concrete, has a substantially I shape in plan view, and has a foot 121 continuous to the bottom plate 4 at the lower end. Yes. A connection box 122 is formed on the inner surface and the rear surface of the intermediate wall block 12, and a PC steel material insertion hole 123 communicating with the connection box 122 is formed on both side end surfaces. Further, an upper upward surface 124 for supporting the top slab 5 is provided on the upper end side of the intermediate wall block 12.

The column wall block 13 is made of precast concrete, has a thick column portion 136 at the center in the left-right direction, has a substantially T-shape in plan view, and has a foot portion 131 that continues to the bottom plate 4 at the lower end. In addition, a notch portion 137 for receiving the beam 3 is provided at a portion corresponding to the thick column portion 136 at the upper end portion. A beam support surface 136 a for attaching the beam 3 is provided on the upper surface side of the thick column portion 136. A connection box 132 is formed on the inner surface and the rear surface of the column wall block 13, and PC steel material insertion holes 133 communicating with the connection box 132 are formed on both side end surfaces. Further, an upper upward surface 134 for supporting the top slab 5 is provided on the upper end side of the column wall block 13.

Strand insertion holes for inserting strands ST, which will be described later, from the PC steel at positions that do not interfere with the PC steel material insertion holes 113, 123, 133 of the corner wall block 11, the intermediate wall block 12, and the column wall block 13 115, 125, and 135 are formed so as to be continuous with each other.

The column 2 is made of precast concrete, and a column base block 21 continuous with the bottom plate 4 and a column block 22 standing on the column base block 21 are connected using an unbonded PC steel rod P which is a PC steel material. It is what is done. A beam support surface 22 a for supporting the beam 3 is provided at the upper end of the column block 22.

The beam 3 is made of precast concrete, and as shown in FIG. 6, the beam blocks 31 a at both ends constructed between the column wall block 13 of the side wall 1 and the column 3 adjacent to the side wall 1 are mutually connected. And a plurality of intermediate beam blocks 31b provided between the adjacent pillars 3. As shown in FIG. 5, the ends of the beam blocks 31 are connected by using a horizontal PC steel rod P which is a PC steel material arranged in the longitudinal direction. 4 and 5, each beam block 31 is connected to the column wall block 13 and the column 2 using a vertically oriented PC steel rod P, which is a PC steel material. Each beam block 31 is formed with a strand insertion hole 311 through which a strand ST, which will be described later, is inserted from a PC steel, so as to be continuous with each other. An upper upward surface 312 for supporting the top slab 5 is formed on both side edges of each beam block 31.

The bottom plate 4 has a reinforcing bar 41 in a space formed between the

legs

111, 121, 131 of the corner wall block 11, the intermediate wall block 12, and the column wall block 13 constituting the side wall 1 and the column base block 31 of the column 3. It is comprised by placing concrete after placing.

The top plate slab 5 is made of precast concrete having a flat plate shape and is placed on the upper

upward surfaces

114, 124, 134 of the side wall 1 and the upper upward surface 312 of the beam 3, and cooperates with the beam 3. It is laid so as to cover the upper surface of the water storage space R. The top slabs 5 adjacent to each other via the beam 3 are joined together using a PC steel rod P that penetrates the beam 3 as shown in FIG.

For the connection and tightening connection using the PC steel material in the present embodiment, a normal method such as screwing the nut Nt after attaching the washer W is used. Further, the connection between the PC steel bars P is performed by a normal method using a coupling J as a connecting member.

Next, details of the rainwater storage tank C will be described together with its manufacturing method.

In the construction, first, the first corner wall block 11a is placed at an arbitrarily determined reference position, and the first flat wall portion 1a and the second flat wall portion 1b are based on the corner wall block 11a. Go build each one. That is, the PC steel material in which the intermediate wall block 12 is adjacent to one end face of the first corner wall block 11a via a sealing material (not shown), and both the

blocks

11 and 12 are inserted into the PC steel material insertion holes 113 and 123. Tightly coupled with a PC steel rod P.

Next, the next intermediate wall block 12 is adjacent to the open end face of the intermediate wall block 12, and both the intermediate wall blocks 12 and 12 are inserted into the PC steel material insertion holes 123 and 123. Tighten with. In this way, the required number of intermediate wall blocks 12 are tightly connected, and the second corner wall block 11b is similarly tightly connected to the outer end surface of the last intermediate wall block 12 to thereby form the first flat wall. Build part 1a.

In this state, the strand insertion holes 115 and 125 of all the corner wall blocks 11 and the intermediate wall block 12 constituting the first flat wall portion 1a are continuous. Prestress is introduced to the entire first flat wall portion 1a forming one side of the rainwater storage tank C by inserting the strand ST made of PC steel into the strand insertion holes 115 and 125 and tightening them.

On the other hand, with respect to the second flat wall portion 1b, the intermediate wall block 12 is adjacent to the other end surface of the first corner wall block 11a via a sealing material (not shown), and both the

blocks

11a and 12 are inserted into the PC steel material. The steel plates P, which are PC steel materials inserted through the

holes

113 and 123, are tightly coupled.

Next, as shown in FIG. 3, the PC steel material in which the next intermediate wall block 12 is adjacent to the open end surface of the intermediate wall block 12 and both the intermediate wall blocks 12 and 12 are inserted into the PC steel material insertion hole 123. Tightly coupled with a PC steel rod P. In this way, the required number of, for example, two intermediate wall blocks 12 are tightly coupled, and then the column wall block 13 is adjacent to the outer end surface of the intermediate wall block 12 at the front end so that the intermediate wall block 12 and the column wall are adjacent to each other. The block 13 is tightly coupled by a PC steel rod which is a PC steel material inserted into the PC steel material insertion holes 123 and 133.

Thereafter, the intermediate wall block 12 is adjacent to the outer end face of the column wall block 13, and the column steel block 13 and the intermediate wall block 12 are inserted into the PC steel material insertion holes 133 and 132. The rod P is tightly coupled. By repeating the above operations, the construction of the second flat wall portion 1b in which the column wall blocks 13 are present at predetermined positions at a constant pitch is advanced.

Then, the second flat wall portion 1b is constructed by tightly connecting the third corner wall block 11c to the outer end surface of the last intermediate wall block 12 in the same manner. In this state, the strand insertion holes 115, 125, and 135 of all the corner wall blocks 11, the intermediate wall block 12, and the column wall block 13 constituting the second flat wall portion 1b are continuous. Prestress is introduced to the entire second flat wall portion 1b forming one side of the rainwater storage tank C by inserting the strand ST made of PC steel into the strand insertion holes 115, 125, and 135 and tightening them.

After the construction of the second flat wall portion 1b or in parallel with the construction, the third flat wall portion 1c is constructed. The construction will be described below.

About the 3rd flat wall part 1c, the intermediate wall block 12 is made to adjoin via the sealing material which is not shown in figure on the other end surface of the 2nd corner wall block 11b, These both

blocks

12 and 12 are said PC steel material penetration hole 123. , 123 is tightly coupled by a PC steel rod P which is a PC steel material inserted through 123. And the 3rd flat wall part 1c in which the column wall block 13 exists in a predetermined location with a fixed pitch by the procedure similar to the 2nd flat wall part 1b mentioned above is constructed | assembled.

At that time, every time the pillar wall block 13 of the third flat wall portion 1c is installed, the beam 3 is constructed between the pillar wall block 13 and the pillar wall block 13 of the second flat wall portion 1b. To do.

That is, when the column wall block 13 of the third flat wall portion 1c is installed, the column wall block 13 and the column wall block 13 of the second flat wall portion 1b facing the column wall block 13 are arranged. A plurality of columns 2 are erected in a row in between, and the beam 3 is installed on the columns 2. More specifically, the column block 22 is placed on the column base block 21, and the

columns

21 and 22 are temporarily fixed by the unbonded PC steel rod P so as to allow a slight relative movement. 2 is erected. Similarly, the plurality of pillars 2 are installed in a row at predetermined intervals.

Thereafter, the beam blocks 31a at both ends are installed between the column wall block 13 of the side wall 1 and the column 2 adjacent to the side wall 1, and the intermediate beam block 31b is installed between the columns 2 adjacent to each other. .

Then, the outer ends of the beam blocks 31a at both ends are temporarily fixed to the beam support surface 136a of the column wall block 13 by using a vertical PC steel rod P, and the inner ends of the beam blocks 31a at both ends and intermediate Both ends of the beam block 31b are temporarily fixed to the beam support surface 22a of the column 2 by using a vertically oriented PC steel bar P, respectively. In this state, the strand insertion holes 311 of each beam block 31 are continuous. The strand ST is passed through the continuous strand insertion hole 311, and prestress is introduced to the entire beam 3 by the strand ST. In this way, after the entire beam 3 has a prestressed concrete structure, the vertical PC steel rod P is finally tightened to firmly tighten the beam 3 to the side wall 1 and the column 2 and prestress. The horizontal PC steel bar P is also tightened to secure the connection between the beam blocks 31.

The construction work of the pillar 2 and the beam 3 as described above is performed every time the pillar wall block 13 of the third flat wall portion 1c is installed, and a plurality of beams 3 are attached to the second flat wall portion 1b of the side wall 1. And the third flat wall portion 1c. Then, the fourth corner wall block 11d is joined to the outer end surface of the last intermediate wall block 12 of the third flat wall portion 1c, and all the corner wall blocks 11, the intermediate wall block 12 and the column wall block 13 are stranded. Prestress is introduced into the entire third flat wall portion 1c forming one side of the rainwater storage tank C using ST.

Thereafter, another flat wall portion, that is, the fourth flat wall portion 1d in the present embodiment is constructed by a construction method according to the first flat wall portion 1a.

After the above construction work is completed, the reinforcing bar 41 is arranged inside the side wall 1 and concrete is placed to construct the bottom board 4.

Then, the rainwater storage tank C is completed by laying the top slab 5 between the side wall 1 and the beam 2 without any gap.

As explained above, by using the method for manufacturing a rainwater storage tank according to the present invention, a column / beam structure blocked by precast is adopted, so the work period is shortened and the maintenance work is easy to mechanize. Of course, it is possible to construct a rainwater storage tank, as well as an entire beam formed by arranging a plurality of beam blocks in the longitudinal direction, an entire flat wall part forming one side of the side wall, and Because it is possible to introduce appropriate pre-stress into the beam end and column or beam end and column wall block formed linearly in the vertical direction, it has safe and reasonable strength. A rainwater storage tank can be realized. In addition, as shown in the present embodiment, the plurality of beam blocks temporarily fixed on the columns and side walls are tightly coupled in the longitudinal direction with PC steel strands and prestress is introduced. The beam blocks can be fastened without being restrained by each other, and a prestress corresponding to the design value can be introduced over the entire length inside the entire beam. And since the whole beam which became the prestressed concrete structure in this way is securely fastened to the side wall and the pillar by introducing the prestress to the whole longitudinal direction while pre-tightening the PC steel bar, it is safe. A rainwater storage tank having a certain strength can be constructed.

In the present embodiment, the rainwater storage tank is constructed with the first corner wall block as a reference position, so that accuracy and planning in construction can be further secured, and as a result It is possible to construct a rainwater storage tank excellent in safety and safety.

Note that the present invention is not limited to the embodiment described in detail above.

Rainwater storage tanks are generally buried underground, but some or all of them may be exposed on the ground surface.

The side walls are not limited to those having a quadrangular shape in plan view with the four corners being substantially right angles as shown in the present embodiment, but having various shapes corresponding to various circumstances of the construction site. Can do. Examples of this include a trapezoidal shape or a polygonal shape in plan view, but other than that, a part of the plan view protrudes outward or is recessed inward. Various things are possible, such as a mode of playing. In other words, the other flat wall portions are not limited to those shown in the present embodiment, and various shapes and structures are conceivable.

The corner wall blocks are not limited to those having an L-shape in plan view, and the shapes of the intermediate wall block and the column wall block may be various shapes without departing from the spirit of the present invention. Of course it can be applied.

The column for beam support may be a circular cross section or a polygon cross section, for example, instead of a square cross section. Also, various shapes of the beam can be employed without departing from the spirit of the present invention.

Various methods can be considered as a method of applying tension to the PC steel material when the blocks are tightly connected to each other. When only the nuts are tightened or when various jacks are used, various other modes are listed. be able to.

The location where the PC steel material insertion hole and the strand insertion hole are provided, in other words, the location where the PC steel material such as the PC steel rod and the strand is arranged, is appropriately set according to various conditions such as the size and balance of the finished product. Of course, the present invention is not limited to that shown in this embodiment.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

If the method for manufacturing a rainwater storage tank according to the present invention is adopted, a rainwater storage tank that shortens the construction period and facilitates the mechanization of maintenance work because it employs a column / beam structure blocked by precast concrete. As a matter of course, it is possible to construct an appropriate pre-process for one entire beam formed by arranging a plurality of beam blocks in the longitudinal direction or each flat wall portion forming one side of the side wall. It is possible to introduce stress. Therefore, a rainwater storage tank having a safe and reasonable strength can be manufactured.

DESCRIPTION OF SYMBOLS 1 ... Side wall 1a ... 1st flat wall part 1b ... 2nd flat wall part 1c ... 3rd flat wall part 1d ... 4th flat wall part (other flat wall part)
2 ... pillar 3 ... beam 4 ... bottom 5 ... top slab 11 ... corner wall block 11a ... first corner wall block 11b ... second corner wall block 11c ... third corner wall block 11d ... fourth corner wall Block 12 ... Intermediate wall block 13 ... Column wall block 21 ... Column base block 22 ... Column block 22a ... Beam support surface 31 ... Beam block 41 ... Reinforcing bar 111 ... Foot 112 ... Connection box 113 ... PC steel material insertion hole 114 ... Upward upward Surface 115 ... Strand insertion hole 121 ... Foot portion 122 ... Connection box 123 ... PC steel material insertion hole 124 ... Upper upward surface 125 ... Strand insertion hole 131 ... Foot portion 132 ... Connection box 133 ... PC steel material insertion hole 134 ... Upper upward surface 135 ... strand insertion hole 136 ... thick column part 136a ... beam support surface 137 ... notch 311 ... strand insertion hole 312 ... on Up-facing C ... rainwater reservoir Nt ... nut J ... coupling P ... PC steel rod R ... water storage space ST ... strand W ... washer

Claims

A side wall constituted by joining a plurality of blocks, a plurality of columns arranged in a row in a water storage space surrounded by the side walls, and between these columns and between the columns and the side walls A plurality of beam blocks that are installed on the beam support surfaces of the columns or the beam support surfaces of the side walls using PC steel, and are formed by joining the beam blocks in the longitudinal direction; A rain water storage tank comprising: a bottom plate having a peripheral edge continuous with a lower end portion; and a top slab erected between the beams and between the beams and side walls so as to form the water storage space between the bottom plates. A method of manufacturing
The beam blocks are horizontally mounted between the columns and between the side walls and the columns, and then the beam blocks are temporarily fixed to the columns and the side walls by the PC steel material, and then the longitudinal blocks abut each other. Pre-stress was introduced into all beam blocks using PC steel strands, and then the PC steel material was finally tightened so that the beam blocks were tightly coupled between the side wall and the column. A method for producing a rainwater storage tank, which is characterized.
The side wall forms a corner wall block that forms a corner of the water storage space, an intermediate wall block disposed between the corner wall blocks, and an intermediate wall block at a required location or between the intermediate wall block and the corner wall block. It is constructed using a column wall block that is arranged in the wall and supports the end of the beam, and is connected between the two corner wall blocks and the two corner blocks after the blocks are connected by a PC steel material. 2. The method for manufacturing a rainwater storage tank according to claim 1, wherein prestress is further introduced into all the blocks using a PC steel strand.
The pillar is formed by joining a pillar block continuous to the bottom plate and a pillar block standing on the pillar block using a PC steel material, and the pillar block is made of the PC steel material. Is temporarily fixed on the column base block, and the beam block is temporarily fixed to the beam support surface of the column block using a PC steel material. Prestress is introduced using a stranded wire, and then the PC steel material is finally tightened to tightly couple the beam block to the column block, and the column block is tightly coupled to the column base block. The manufacturing method of the rainwater storage tank of Claim 1 or 2 to do.
A first flat wall portion formed between the first corner wall block and the second corner wall block; and the first corner wall block adjacent to the first flat wall portion; A second flat wall portion formed between the third corner wall block and a surface formed between the second corner wall block and the fourth corner wall block facing the second flat wall portion. And a third flat wall portion formed adjacent to the third flat wall portion and formed between the fourth corner wall block and the third corner wall block. It is made up of
The first corner wall block is placed at the reference position, and the first flat wall portion and the first flat wall portion are respectively constructed from the corner wall block as a base point. After the completion of the construction, the construction of the third flat wall part is advanced, and each time the pillar wall block of the third flat wall part is installed, the pillar wall block and the second flat wall part facing the pillar wall block 3. A plurality of columns are erected in a row between the column wall blocks and the beams are sequentially installed on the columns, and finally the other flat wall portion is completed. Or the manufacturing method of the rainwater storage tank of 3.