JP2543667B2 - Rainwater storage tank - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater storage tank which is preferably used when a large amount of rainwater is temporarily stored.

[0002]

2. Description of the Related Art In recent years, it has been practiced to bury this kind of rainwater storage tank underground, for example, and use its upper surface as an artificial base. Therefore, the conventional rainwater storage tank is generally constructed by cast-in-place concrete or by a precast box culvert in the shape of a box.

[0003]

However, the construction using cast-in-place concrete requires a skilled worker such as a reinforcing bar, a form carpenter, a scaffold, a supporter, and the like, and it is difficult to shorten the construction period. In particular, since the side wall has a large area and a large amount of formwork is required, on-site construction becomes complicated and a lot of time is spent. On the other hand, with the precast box culvert, the construction period can be shortened compared to the case of casting on site, but since box-shaped box culverts are installed side by side, there is also a wall inside the storage tank. Become. As a result, the amount of water storage decreases, and more material is needed than necessary, which is uneconomical. Also, if there is a wall inside, it will be difficult to clean the inside because there are many obstacles. Also, when cleaning is completed and water is introduced, make sure that no workers remain inside. There is also the drawback that it becomes difficult. Furthermore, if a box culvert is used, it will be difficult to construct a deep reservoir due to manufacturing and transportation restrictions, and if the box culvert can be forcibly divided, its joint structure and seal structure will become complicated. Occurs.

As a measure for solving such a problem, for example, only the bottom slab is made of cast-in-place concrete, and a side wall made of precast concrete block is erected on the bottom slab to construct a storage tank. It is conceivable to support the floor member covering the upper surface by columns or beams.
However, when placing a wall member made of precast concrete block on a bottom slab made of cast-in-place concrete to form a side wall, etc., it is necessary to secure the joint strength and sealing property between the bottom slab and the side wall by simple work. However, some measures are desired.

The present invention has been made in view of such circumstances, and it is possible to secure high strength and sealability without inviting complicated site construction, and use a box culvert or the like. It is an object of the present invention to provide a rainwater storage tank that can have a larger internal capacity than that of the one.

[0006]

The present invention takes the following means in order to achieve such an object.
That is, the rainwater storage tank according to the present invention comprises a bottom slab, a plurality of wall members made of precast concrete blocks which are horizontally installed so as to be adjacent to each other in the lateral direction, and upper end openings of side walls constructed by these wall members. A floor slab that closes the wall, and each of the wall members is placed on the bottom slab via an uneven engagement portion that allows lateral movement of the wall member, The members are tightly connected to each other by a connecting member in a direction toward each other, and a hardening material is filled in the loose clearance of the concave-convex engaging portion to connect the bottom plate and each wall member.

In order to particularly simplify the work at the site, column members made of precast concrete blocks are erected at required intervals in a storage area surrounded by side walls, and beams made of precast concrete blocks are mounted on these column members. It is preferable that the members are erected, and that the beam members support the floor members made of precast concrete blocks constituting the floor slab.

In this case, in order to simplify the supporting structure of the beam member on the side wall portion, a beam supporting wall member integrally provided with a pillar portion corresponding to the pillar member is used on a part of the side wall. Is desirable.

In order to simplify the structure of the corner portion of the side wall and reasonably improve the strength and the sealing property, the side wall is formed of a wall member for forming a straight wall portion and a wall member for forming a corner portion in plan view. It is preferable to construct it by using an L-shaped corner wall member.

A preferred embodiment of the concave-convex engaging portion comprises a reinforcing bar projecting from the bottom slab and a reinforcing bar insertion hole opened in the lower end surface of the wall member, and with the reinforcing bar inserted in the reinforcing bar insertion hole. An example is a structure in which a floating gap is formed between the outer circumference of the reinforcing bar and the inner circumference of the reinforcing bar insertion hole.

In order to reduce the thickness of the floor slab reasonably, it is desirable that the wall member and the floor member are tightly joined by a tension member in a tensioned state.

[0012]

Since at least the side plates of this rainwater storage tank are made of precast concrete blocks, large-scale formwork work is unnecessary. Therefore, it is possible to greatly reduce the degree of dependence on skilled workers such as reinforcing steelwork, formwork carpenters, scaffolds, and supporters, and to prevent complicated work, thereby shortening the construction period.

Moreover, if the side wall and the bottom slab are connected as described above, it is possible to secure both high mechanical strength and sealing performance. That is, since the wall member is placed on the bottom plate via the concave / convex engaging portion that allows the play in the horizontal direction, the wall members constituting the side walls are easily tightened in the direction in which they are brought close by the connecting member. Therefore, it is possible to sufficiently secure the sealing property of the joint between the wall members.
In addition, since the wall member can be displaced in the lateral direction within the permissible range of movement due to the uneven engagement portion, a rubbing action can be caused between the lower surface of the wall member and the upper surface of the bottom plate. As described later, the watertightness between the wall member and the bottom plate is also improved. Then, in this state, by filling the hardening material into the floating gap of the concave-convex engagement portion and hardening,
The wall member can be reliably fixed to the bottom plate while maintaining the watertightness.

Further, according to such a structure, it is not necessary to provide a wall inside, and it becomes possible to support the floor member by using a pillar member or a beam member. By doing so, the internal structure is improved. Is simplified, and the inside of the storage tank can be efficiently cleaned using a cleaning device having a rotating brush or the like. In addition, since the column member rather than the wall provides a good visibility in the storage tank, it becomes easy to confirm whether or not the worker remains inside when introducing water. That is, this type of rainwater storage tank, for example,
It may be used as a disaster control pond, and in this case, it is possible to pour water immediately after the cleaning work is completed. Even in such a usage mode, according to the configuration of the present invention, the internal structure is simple, so that it is easy for the operator to confirm, and it is possible to ensure high safety. Further, since the wall members and the pillar members can be easily manufactured even if they are tall, and they are relatively easy to carry, they can be applied to a deep reservoir without complicating the joint structure or the seal structure. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, this rainwater storage tank has a bottom slab 1, side walls 2, column members 3, and beam members 4.
And a floor slab 5, which is used by being buried in the ground.

The bottom slab 1 is made of cast-in-place concrete, which is formed by pouring concrete on the bottom of the excavation area, and the edge portion on which the side wall 2 is to be mounted and the portion on which the pillar member 3 is to be erected. Has a bulkhead 11 for the side wall and a bulkhead 12 for the pillar, and the deformed bars 13 are projected on the upper surfaces of the bulkheads 11 and 12 while being positioned.

The side wall 2 comprises a wall member 21 for corners, wall members 22 and 23 for straight walls, and a wall member 24 for supporting beams. These wall members 21, 22, 23 and 24 are provided.
Are laterally adjacent to each other and tightened by a PC steel rod 25 as a connecting member.

The corner wall member 21 is made of precast concrete block, as shown in FIG.
It has a bent plate shape having an L-shape in plan view, and has a plurality of rebar insertion holes 27 opened on the lower surface by embedding a metal sleeve 26 at the lower end thereof. A thick portion 21a is provided on both sides of the lower end of the wall member 21 for ensuring upright stability, and a horizontal ridge 21b is provided on the inner surface of the vicinity of the upper end to form a floor receiving surface 21c. are doing.

As shown in FIG. 4, the wall members 22 and 23 for the straight walls are made of a precast concrete block and have a flat plate shape. By embedding a metal sleeve 26 at the lower end portion thereof, Reinforcing bar insertion holes 27 that open to the lower surface are formed. The lower end portions of the wall members 22 and 23 have thick portions 22a and 23a for securing standing stability.
Are provided on the inner surface near the upper end side.
The floor receiving surfaces 22c and 23c are formed by protruding the b and 23b.

As shown in FIG. 5, the beam supporting wall member 24 is made of a precast concrete block, has a flat plate shape, and has a metal sleeve 26 at the lower end thereof.
Bar insertion hole 27 that opens to the bottom surface by burying
Has been formed. Thickened portions 24a are provided on both sides of the lower end of the wall member 24 to ensure standing stability, and a horizontal ridge 24b is provided on the inner surface side near the upper end to form a floor receiving surface 24c. Is forming. Further, a column portion 24d having the same height as the column member 3 is integrally formed at the center of the inner surface of the beam supporting wall member 24, and the upper surface of the column portion 24d is connected to the beam receiving surface 24e. No. A cutout portion 24f is formed in a portion of the wall member 24 corresponding to the small opening 42 of the beam member 4.
Is provided so as to be able to receive a reinforcing bar (not shown) extending from the small opening 42. The height difference between the beam receiving surface 24e formed on the pillar portion 24d and the floor receiving surface 24c formed on the upper surface of the ridge 24b is determined by the beam member 4
It corresponds to the vertical dimension of. In addition, each wall member 2
Floor receiving surfaces 21c, 22c, 23 of 1, 22, 23, 24
The vertical dimension between c, 24c and the upper end surface of the wall members 21, 22, 23, 24 corresponds to the thickness dimension of the floor slab 5.

Therefore, the side wall 2 corresponds to each of the wall members 2 described above.
1, 22, 23, 24, the wall members 21, 22, 23,
The wall members 21, 22, 23, 24 are placed on the bottom plate 1 via the concave-convex engaging portions 6 that allow the horizontal movement of 24.
The PC plates 25 are tightened and connected to each other, and the floating gap 7 of the concavo-convex engaging portion 6 is filled with mortar as a hardening material so that the bottom slab 1 and each of the wall members 21, 22, 2,
It is constructed by combining 3, 24 with.

The concave-convex engaging portion 6 is composed of the above-mentioned deformed reinforcing bar 13 protruding from the bottom plate 1 and a reinforcing bar insertion hole 27 formed in the lower surface of the wall members 21, 22, 23 and 24. The wall members 21, 22, 23, and 24 can be placed on the bottom plate 1 while loosely fitting 13 into the rebar insertion hole 27. The wall members 21, 22, 23, 24
The mortar 14 is laid between the lower surface of the bottom plate 1 and the upper surface of the raised portion 11 of the bottom plate 1 by a required thickness.

FIG. 6 shows a tightening portion made of PC steel material 25. That is, each of the wall members 21, 22, 23, 24
A recess 28 is formed in the vicinity of the end of the box by box extraction, and a PC steel material insertion hole 29 is drilled in the wall members 21, 22, 23, 24 so that the recesses 28 communicate with each other. Then, the screw portions 25a at both ends of the PC steel material 25 inserted into the PC steel material insertion holes 29 are positioned in the respective concave portions 28, and the nuts 25b are respectively attached to the screw portions 25a while applying tension to the PC steel material 25. By fixing, the adjacent wall members 21, 22, 23, 24 are tightly connected to each other.

FIG. 7 is a plan view showing a joint portion between the wall member 21 for corner and the wall member 22 for straight wall. In the joint portion, a fitting groove 21d that is continuous in the vertical direction is provided only on one joint surface 21c. The water-expandable rubber 8 is fitted into the fitting groove 21d, and hard rubbers 81 for securing clearance are adhered to both sides of the water-expandable rubbers 8 so as to form between the water-expandable rubbers 8 and the respective hard rubbers 81. The grout 82 is injected into the clearance of about 5 mm between the joining surfaces. The joint groove 83 is filled with a sealing 84 made of polyurethane. A joint between a corner wall member 21 and a straight wall member 23, a joint between adjacent straight wall members 22 and 22, 23 and 23, and a straight wall member 23 and a beam support. The joint portion with the wall member 24 for use also has a similar structure.

As shown in FIG. 2, the pillar member 3 is made of a precast concrete block, has a prismatic shape, and a metal sleeve 31 is embedded in the lower end of the pillar member 3 to insert a reinforcing bar open at the lower surface. A hole 32 is formed. At the lower end of the column member 3, an enlarged portion 33 for securing standing stability is provided, and at the upper end, a projecting portion is provided to form a horizontal beam receiving surface. Then, the column member 3 is erected on the bottom plate 1 while the deformed reinforcing bar 13 protruding from the column bulk part 12 of the bottom plate 1 is loosely fitted into the reinforcing bar insertion hole 32,
The column member 3 is fixed on the bottom slab 1 by injecting and hardening mortar into the reinforcing bar insertion hole 32.

The beam member 4 is made of a precast concrete block, has a prismatic shape, and has protruding portions at both edges of the upper end portion to form a horizontal floor receiving surface 41. The beam member 4 has both ends supported by the beam receiving surfaces 24 e and 34, and is bridged between the beam supporting wall member 24 and the column member 3 and between the column members 3.

The floor slab 5 is constructed by laying a plurality of rectangular floor members 51 made of a precast concrete block so as to be adjacent to each other, and each floor member 51 includes wall members 21, 22,
The floor receiving surfaces 21c, 22c, 23c, 24c of 23 and 24 and the floor receiving surface 41 of the beam member 4 are supported.

A shear cotter 52 is used to join the floor members 51 to each other. That is, as shown in FIG. 11, inclined surfaces 51 a are formed at the long-side joint ends of the floor members 51 to be butted, and a shear cotter 52 is attached to the inclined surfaces 51 a. An anchor 53 is fixed to the share cotter 52, and the anchor 53 is fixed to the floor member 51.
The shear cotter 52 is fixed to the floor member 51 by being embedded in the concrete structure. And
The adjacent floor members 51 are connected to each other by joining the edges of the corresponding shear cotters 52 by welding.

The floor member 51 supported by the wall members 21, 22, 23 and 24 is tightly connected to the wall members 21, 22, 23 and 24 by a PC steel material 54 which is a tensile member. FIG. 12 is a partial cross-sectional view showing a joint structure between the upper portion of the wall member 22 and the floor member 51. The floor member 51 is provided with a plurality of recesses 55 formed by box-removal at portions respectively spaced inward from the long side and the short side by a fixed distance, and a PC steel material insertion hole is formed in each of the recesses 55. It communicates with the corresponding end face 51b via 56. Further, the PC steel material insertion holes 56 of the wall members 21, 22, 23, 24 are provided.
The PC steel material insertion hole 57 is provided at a position that can be matched with the above, and a counterbore hole 58 is formed at the outer end of the PC steel material insertion hole 57. Then, the screw portions 54a at both ends of the PC steel material 54 inserted into the PC steel material insertion holes 56 and 57 are positioned in the counterbore hole 58 and the concave portion 55, and the PC steel material 54
The nuts 54b are fixed to the screw portions 54a in a state where tension is applied to the wall members 21, 22, 23, 24.
And the floor member 51 are tightly connected. When the upper end portions of the wall members 21, 22, 23, and 24 and the floor members 51 are tightened with a plurality of PC steel members 54 to have a rigid structure, the thickness of the floor members 51 is reduced without difficulty. It is possible. FIG. 13 shows a floor member 51 when receiving a downward load.
Of the floor member 51 of the floor member 51
3 is a graph showing the relationship between the bending moment of the floor member 51 and its position with the distance L from 1b as the horizontal axis. When the connection is made rigid as described above, the end surface 5
The bending moment Mo at the position 1b has a certain magnitude in the negative direction making the upper surface convex, and the bending moment M becomes 0 at a position away from the end face 51b by a certain distance,
Further away from the end surface 51b, the bending moment M becomes a plus direction in which the upper surface is concaved, and the absolute value of the plus bending moment M increases as approaching the center of the floor member 51. In the case of the rigid structure, the maximum value of the positive bending moment is reduced by the amount corresponding to the generation of the negative bending moment M0 as compared with the conventional hinge structure, so that the thickness of the floor member 51 can be reduced without reducing the strength. It can be made thin.

Next, a method of constructing this rainwater storage tank will be described step by step.

(1) The ground is excavated to a predetermined depth, and a storage tank hole having a sufficient size is secured in consideration of the space for tightening work.

(2) A crushed stone foundation (not shown) is provided at the bottom of the hole for the storage tank, and the bar arrangement for bottom slab is performed on this crushed stone foundation. When the deformed rebars 13 for fixing the wall members 21, 22, 23, 24 and the column member 3 are raised, a positioning iron plate having a hole at a predetermined position is used.

(3) A mold is provided, and concrete for bottom slab is placed in the mold.

(4) After the concrete of the bottom slab 1 is hardened, the wall member 21 for the innermost corner in FIG. 1 is erected. That is, the mortar 1
4 is laid, and deformed bar 13 protruding from the upper part 11
The wall member 21 is raised on the bottom slab 1 while loosely fitting into the reinforcing bar insertion hole 27 of the wall member 21.

(5) Next, the wall member 2 for this corner
1, a wall member 21 for a straight wall adjacent in the front-rear direction in the figure, a wall member 22 for a straight wall adjacent in the left-right direction in the figure, or
The beam supporting wall member 23 adjacent to the wall member 22 is sequentially raised and connected. Specifically, for example, as shown in FIGS. 8 and 9, the wall member 22 to be raised is provided next to the wall member 21 that has already been raised, and the deformed rebar 13 of the bottom slab 1 is inserted into the rebar insertion hole 27. Place it while loosely fitting.
After that, as shown in FIG.
The C steel material 25 is tightened and joined in a direction toward each other. At this time, the wall member 22 slides laterally within the range of the loose fitting gap 7 of the concave-convex engaging portion 6 while consolidating the water expansion rubber 8, and this movement causes the lower surface of the wall member 22 to move. Rubbing is performed between the bottom plate 1 and the wall member 22 and the bottom plate 1.
The water tightness between and improves. More specifically, for example, as shown in an extreme example in FIG. 8, the mortar 14 laid on the bottom plate 1 has a discontinuous portion 14a, or the lower end 8a of the water-expandable rubber 8 is sufficiently large. When the wall member 22 does not reach the upper surface of the bottom slab 1, simply placing the wall member 22 on the bottom slab 1 will result in minute gaps 14b and 14c as shown in FIG.
May remain, and water in the rainwater reservoir may leak to the outside. However, when the wall member 22 moves in the lateral direction due to the tightening operation by the PC steel material 25, the lower surface of the wall member 22 and the upper surface of the bottom plate 1 are rubbed with each other via the mortar 14 layer, and also in the gaps 14b and 14c. The watertightness is improved over the entire mortar 14. When the loose fitting gap 7 of the concave-convex engaging portion 6 is filled with mortar and cured in this state, the wall member 22 is strongly bonded to the bottom plate 1, and the bottom plate 1 and the wall member 22 are integrated. It

(6) By repeating the above operation, the wall member 2
1, 22, 23 and 24 are connected and erected.

(7) The column member 3 is erected on the column upper portion 12 of the bottom slab 1. Also in this case, the deformed reinforcing bar 13 protruding from the bottom plate 1 is loosely fitted in the reinforcing bar insertion hole 32 of the column member 3, and the reinforcing bar insertion hole 32 is filled with mortar and hardened, so that the column member 3 is connected to the bottom plate 1. Fixed to.

(8) The beam member 4 is provided with beam receiving surfaces 24 at both ends thereof.
e, 34 while supporting the beam 24 and the column 3
And between the column members 3. A space 43 for connecting the reinforcing bars (not shown) extending from the small holes is secured between the small holes 42 of the beam member 4. One row of beam members 4
At the stage when the erection is completed, the reinforcing bars extending from the small opening 42 of the beam member 4 are integrated by binding. And
At the stage where the rebar arrangement processing is completed, the fore-edge 42 of the beam member 4 is
Concrete is poured into the space 43 formed between them.

(9) The floor members 51 are sequentially installed on the beam members 4 that have been constructed from the innermost row. The floor members 51 are connected to each other by welding the shear cotters 52 fixed to the long sides of the floor members 51, and the corresponding wall members 21, 22, 23, 24 and the floor member 51 are connected to the PC steel 54. For tight coupling.

(10) In the same manner as above, the beam member 4 and the floor member 51 in the next row are installed.

(11) Reinforcing bars 51d (only a part of which are shown in FIG. 1) extending from the small edge 51c of the floor member 51 are welded to each other on the beam member 4.

(12) Floor member 5 between the last beam members 4
When the arrangement of No. 1 is finished, the wall members 23 and 24 along the left-right direction on the front side are arranged in the same manner as those on the back side.

(13) Each wall member 21, 22, 23, 24
Build joints between them.

(14) Pour in-place concrete onto the beam member 4.

(15) The floor member 51 is waterproofed to complete the construction.

The present invention is not limited to the above-described embodiments, but within the scope of the invention.
Various modifications are possible.

For example, the pillar portion of the beam supporting wall member and the pillar member may have a circular cross section or a polygonal cross section instead of the square cross section.

Further, the structure for tightly connecting the wall members to each other is not limited to that of the above-mentioned embodiment, and for example, by using a long PC steel material inserted through a plurality of wall members, The wall members may be tightly coupled.
The method of applying tension to the PC steel material may be only by tightening the nut, or a tension may be applied to the PC steel material using a hydraulic jack or the like, and the nut may be fixed in the tension state. And then a hydraulic jack,
A method of removing a tension rod, a coupler, or the like for transmitting the pulling force of the hydraulic jack to the PC structural member may be used.

Further, in the above-described embodiment, the case where the wall members are tightly coupled to each other and then the floating gap of the concave and convex engaging portion is filled with the hardening material to be hardened is explained. Conversely, the wall member is placed on the bottom plate. The wall member is placed and moved within the range of the floating gap to consolidate the seal material between the wall members as much as possible, and in that state, the floating gap is filled with a hardening material to be cured, and then the wall The members may be tightly connected to each other.

[0051]

EFFECTS OF THE INVENTION Since the present invention has the structure described above, it is possible to secure high strength and sealability without complicating on-site construction, and moreover, the capacity as in the case of using a box culvert. It is possible to provide a rainwater storage tank that does not cause problems such as reduction, cleaning, making internal confirmation difficult, or not adapting to increasing depth.

If not only the side wall but also the pillar member, the beam member and the floor slab are made of precast concrete blocks as in the invention described in claim 2, the on-site formwork and the like can be minimized. It becomes possible to stop at this time, and particularly quick construction becomes possible.

If a beam supporting wall member integrally provided with a pillar portion corresponding to the pillar member on a part of the side wall is used as the invention according to claim 3, a simple flat wall member is used. Compared with the case of joining with a separate column member interposed therebetween, it is possible to greatly reduce the complicated joining portion.

Further, when the corner portion of the side wall is constituted by the wall member for the corner which is in the shape of a bent plate as in the invention according to claim 4, the side wall is constructed by combining only the flat plate-shaped wall member. There is no problem that the sealing structure at the corner portion becomes complicated as in the case of, and it is possible to secure high strength and watertightness with a simple configuration.

Further, in the fifth aspect of the present invention, the concave and convex engaging portion is composed of the reinforcing bar and the reinforcing bar insertion hole. However, the reinforcing bar is projected from the bottom slab as a part of normal rebar work. The reinforcing bar insertion hole can be easily formed by embedding a sleeve or the like when molding the wall member. Therefore, if such an aspect is adopted, the manufacturing can be simplified.

Further, if the wall member and the floor member are tightly joined to each other by the tension member in the tensioned state as in the invention described in claim 6, the floor slab can be reasonably thinned for the reason described above. It becomes possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the same embodiment.

FIG. 3 is a perspective view showing a corner wall member of the embodiment.

FIG. 4 is a perspective view showing a straight wall member of the embodiment.

FIG. 5 is a perspective view showing a beam supporting wall member of the embodiment.

FIG. 6 is a side sectional view showing a wall member joint portion of the embodiment.

FIG. 7 is an enlarged plan sectional view showing a wall member joint portion of the embodiment.

FIG. 8 is an explanatory view schematically showing a wall member standing procedure in the same embodiment.

FIG. 9 is an explanatory view schematically showing a wall member standing procedure in the embodiment.

FIG. 10 is an explanatory diagram schematically showing a wall member erecting procedure in the embodiment.

FIG. 11 is a cross-sectional view showing a floor member joining portion of the embodiment.

FIG. 12 is a front sectional view showing a joint portion between the wall member and the floor member of the embodiment.

FIG. 13 is an operation explanatory view of the same embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bottom slab 2 ... Side wall 3 ... Column member 4 ... Beam member 5 ... Floor slab 6 ... Uneven engagement part 7 ... Floating gap 8 ... Water expansion rubber 11 ... Side wall bulkhead 12 ... Pillar top 13 ... Deformed shape Reinforcing bar 14 ... Mortar 21 ... Corner wall member 22 ... Straight wall member 23 ... Straight wall member 24 ... Beam supporting wall member 25 ... Connecting member (PC steel material) 26 ... Sleeve 27 ... Rebar insertion Hole 28 ... Recessed part 29 ... PC steel material insertion hole 31 ... Sleeve 32 ... Reinforcing bar insertion hole 33 ... Enlarged part 34 ... Beam receiving surface 41 ... Floor receiving surface 42 ... Small edge 51 ... Floor member 52 ... Shear cotter 53 ... Anchor 54 ... Tension Member (PC steel material) 55 ... Recessed portion 56 ... PC steel material insertion hole 57 ... PC steel material insertion hole 58 ... Counterbore hole 81 ... Hard rubber 82 ... Grout 83 ... Joint groove 84 ... Sealing

Claims (6)

(57) [Claims] 1. A floor slab, a plurality of wall members made of precast concrete blocks which are vertically erected on the bottom slab so as to be laterally adjacent to each other, and a floor slab for closing an upper end opening of a side wall constructed by these wall members. A rainwater storage tank comprising: the respective wall members are mounted on a bottom plate through a concave-convex engaging portion that allows lateral movement of the wall members, and the wall members are connected to each other. A rainwater storage tank, characterized in that the bottom plate and each of the wall members are joined together by tightening and coupling the members in a direction toward each other and filling a floating gap of the concave and convex engaging portion with a hardening material. 2. A column member made of precast concrete block is erected at a required interval in a storage area surrounded by side walls,
The rainwater storage tank according to claim 1, wherein a beam member made of a precast concrete block is installed on the pillar members, and the beam member supports the floor member made of the precast concrete block constituting the floor slab. . 3. The rainwater storage tank according to claim 2, wherein the side wall includes a beam supporting wall member integrally provided with a pillar portion corresponding to the pillar member. 4. The side wall includes a wall member for a straight wall forming a straight wall portion of the side wall, and a wall member for a corner having an L shape in plan view forming a corner portion of the side wall. The rainwater storage tank according to claim 1, 2, or 3. 5. A rebar in which the concave and convex engaging portion protrudes from the bottom plate.
A rebar insertion hole formed in the lower end surface of the wall member, and in a state where the rebar is inserted in the rebar insertion hole, a floating gap is formed between an outer periphery of the rebar and an inner circumference of the rebar insertion hole. Claim 1, 2, characterized in that it is configured
Rainwater storage tank according to 3 or 4. 6. The rainwater storage tank according to claim 2, wherein the wall member and the floor member are tightly joined by a tension member in a tensioned state.