JP2005155229A - Rainwater underground permeation structure and its execution method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater reservoir permeation structure capable of getting a large volume of water and gradually permeating and draining the stored rainwater, excellent in the workability and cost effective. <P>SOLUTION: A plurality of box-shaped precast concrete blocks 1 are formed having openings 5, 6 at the side face in which corners of a square top plate 2 and bottom plate 3 are parallelly connected at the columns 4. These concrete blocks 1 are arranged in both longitudinal and breadthwise directions to form a structural body 21 having a successive water reservoirs. Holes 45 for opening for water are formed at the periphery of the structure 21. The rainwater in the structure can outflow from the opening 45. The structure 21 has a large constricted reservoir capacity in one position, As the rainwater in the inside flows out of the hole 45 for water opening of the periphery of the structure 21, the accumulated rainwater can be gradually drained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rainwater underground seepage structure combined with a concrete block for underground water storage tanks and a construction method thereof.

  In recent years, the pavement rate in urban areas has increased, but when it rains, this rainwater cannot penetrate into the basement, so it is transported along the paved road to the sewer and then drained into the river. Such rainwater drainage is calculated so that it can cope with a certain amount of rainfall, but when a large amount of rain falls, the rainwater exceeds the allowable capacity of the sewer and overflows the paved road. Will end up. Therefore, as a countermeasure in such a case, a water storage tank is constructed in the basement, and this rainwater is temporarily collected in the underground water storage tank so as to gradually flow into the sewer.

  As such an underground water tank, what is constructed as follows, for example, is used because it is constructed underground and uses the upper part as a living environment. That is, a concrete foundation is formed on the foundation of the water storage area, and a large number of box culverts are installed and fixed on the foundation in the front-rear direction. (For example, Patent Document 1). Next, reinforcing bars are embedded between the bottoms of the box culverts in each row to form a floor slab by in-situ concrete casting, and the box culverts are sequentially stacked vertically upward. In addition, a lid body in which a reinforcing bar is embedded in advance between the upper portions of the box culverts in each row and is integrally formed with concrete is sequentially placed (for example, Patent Document 2).

  First, the above-mentioned underground water tank needs to secure the required strength such as that it is required that ordinary vehicles can pass on the upper side, so box culverts must be arranged at narrow intervals, Since the space utilization rate becomes small, there is a problem in that it has to be constructed in a region that is significantly larger than the required volume. In addition, when the floor slab is formed by placing concrete on-site, the box culverts are arranged at a narrow interval, so it is not an easy task. In particular, the floor slab is formed after embedding reinforcing bars in each box culvert. It was a very time-consuming task.

  That is, in Patent Document 1, after a concrete foundation is formed and box culverts are arranged on the concrete foundation, the concrete is placed between the bottom walls of adjacent box culverts. It is necessary to cast and cure the concrete between the walls at least twice.

  Moreover, when arrange | positioning a box culvert side by side on a concrete foundation like patent document 1, the height adjustment of box culverts is needed. For this reason, when a height is adjusted by providing a spacer between the concrete foundation and the bottom surface of the box culvert, the box culvert is not integrated with the foundation and the load of the box culvert is applied to the foundation via the spacer. When the strength is insufficient, the foundation is likely to be partially damaged by the load or to cause uneven settlement.

  In particular, these conventional underground water storage tanks are of a type in which box culverts are stacked one on top of the other, so that they are not strong enough to withstand heavy vehicles such as large vehicles and special vehicles. It was.

  On the other hand, underground water storage tanks store rainwater, but it is inevitable that earth and sand will enter along with rainwater even if it is small. And if the accumulated inflow of this earth and sand increases, it may become less than the prescribed volume of the underground water tank. Therefore, it is necessary to clean the underground water tank once every several years to remove earth and sand, etc. In the conventional underground water tank as described above, the box culverts are arranged at narrow intervals. Because heavy machinery and the like cannot be installed, cleaning the floor slabs has to be done manually. In addition, since dirt and sand accumulate in the box culvert, it is necessary to clean it. However, since the entrance and exit of the box culvert is also small, it was hard to clean the inside. This is especially true for large underground reservoirs. Thus, it may be possible to operate a small heavy machine with a space for arranging the box culverts. However, the conventional box culvert has a limit because it needs to have a predetermined strength as described above.

By the way, there is a rainwater storage and penetration underground structure that allows rainwater that has permeated from the ground to temporarily penetrate into the ground while temporarily storing it. As such, it is necessary to bury and bury underground drainage drains configured to allow rainwater to penetrate into the ground from the bottom and both sides in a given area. In addition to providing a rainwater retention space (e.g., Patent Document 3) that can accommodate the entire amount of rainwater, and a concave excavation portion having a required area, both sides of the excavation portion are provided. There is one that forms a single row of rainwater storage grooves (for example, Patent Document 4) by connecting a required number of box-shaped boxes that are configured in such a manner as to enable the permeable outflow of rainwater.
No. 2-334306 JP-A-10-131241 Registered Utility Model No. 3013717 Japanese Patent Laid-Open No. 7-197509

  The rainwater storage and penetration underground structure described above is configured to form a drainage channel by lining up blocks (the underground infiltration channel in Patent Document 3 and the box-shaped box in Patent Document 4), and draining and draining along the way. Therefore, in order to create a facility with a small amount of water storage and a large amount of water storage, the drainage channel must be formed long, which is disadvantageous in terms of construction efficiency and cost.

  Thus, conventionally, there has been no rainwater storage and penetration underground structure having a low storage space occupation ratio and sufficient mechanical strength. If such a rainwater storage and penetration underground structure can be provided, it is desirable to improve the efficiency of the construction work, facilitate the cleaning work, and consequently reduce the work cost.

  The present invention has been made in view of such a problem, and provides a rainwater underground infiltration structure that can obtain a large amount of water storage, can gradually infiltrate and drain the stored rainwater, and has excellent workability and cost. For the purpose.

  According to the first aspect of the present invention, a plurality of box-shaped precast concrete blocks having openings on the side surfaces obtained by connecting the corners of the square top plate and the bottom plate in parallel with columnar portions are formed. A structure having a water storage space arranged in the direction and continuous in the length direction and the width direction, provided with a water passage opening around the structure body, through which rain water inside the structure can permeate and flow out. It is configured.

  The invention according to claim 2 is to form a plurality of box-shaped precast concrete blocks having openings on the side surfaces obtained by connecting the corners of the square top plate and the bottom plate in parallel with columnar portions, and to form a plurality of the concrete blocks in the length direction. A plurality of block wall bodies connected in a standing manner are provided, and a plurality of block wall bodies are provided at intervals in the width direction, and a formwork member is bridged between the top plates of the block wall bodies adjacent in the width direction. A structure in which a top plate portion is formed of the formwork member and a placement top concrete portion formed by placing concrete on the formwork member, and is used for water flow around the structure. An opening is provided, and rainwater inside the structure can be permeated and discharged from the opening.

  According to a third aspect of the present invention, a bottom slab concrete portion is formed at the bottom of the structure.

  According to the invention of claim 4, a plurality of box-shaped precast concrete blocks having openings on the side surfaces obtained by connecting the corners of the square top plate and the bottom plate in parallel with columnar portions are formed, and the plurality of concrete blocks are provided in the length direction. The connected block wall-like bodies are erected, and a plurality of the block wall-like bodies are provided at intervals in the width direction, and a top plate portion is formed between the top plates of the block wall-like bodies adjacent in the width direction. A bottom slab concrete portion is formed on the bottom of the structure, and a groove portion is formed on the top surface of the bottom slab concrete portion to insert the bottom of the block wall-like body, and is passed around the structure. An opening for water is provided, and rainwater inside the structure can be permeated and discharged from the opening.

  According to a fifth aspect of the present invention, a groove portion for inserting the bottom portion of the block wall-shaped body is formed on the upper surface of the bottom slab concrete portion.

  According to a sixth aspect of the present invention, a frame structure is provided on the mold member.

  In the invention of claim 7, after the bottom slab concrete portion having the groove portion on the upper surface is formed, the bottom portion of the block wall-like body is inserted into the groove portion, and a filling material is filled between the bottom portion and the groove portion. And the top plate portion is formed.

  According to the configuration of claim 1, the structure has a large water storage capacity in one place by the water storage space in which the concrete blocks are arranged in the length direction and the width direction and are continuous in the length direction and the width direction. Since the rainwater inside permeates and flows out from the opening for water passage around the water, the accumulated rainwater can be gradually permeated and drained. And since the concrete blocks can be arranged in the length and width directions, and a large water storage capacity can be secured in one place, it is excellent in workability, cost is lower than those forming drainage channels, and maintenance is easy. It becomes.

  According to the configuration of claim 2, the block wall-like body in which a plurality of concrete blocks are connected in the length direction is erected, and a plurality of block wall-like bodies are provided at intervals in the width direction. In the meantime, the edge of the formwork member is engaged with the engaging part of the top plate, the formwork member is spanned, and concrete is placed on the formwork member, and the mold is placed on the upper part of the block wall-shaped body. A structure can be constructed by integrating the frame member and the cast concrete. The structure thus obtained has a wide space between the wall-like bodies and has a box shape having an opening on the side surface of the concrete block itself, so that the space occupation ratio is significantly reduced. Moreover, what is necessary is just to change the length of the columnar part of a concrete block according to the height of a structure, and can respond | correspond to construction | assembly of the structure of various height easily.

  In this way, a structure having excellent strength and a wide water storage space can be obtained. And in the construction of this structure, heavy equipment is placed between the standing positions of the block wall-like body, the block can be installed and the block wall-like body can be constructed, and after the block wall-like body is erected, A structure can be easily constructed by placing a formwork member between them and placing concrete on the formwork member.

  And since the rainwater inside permeates and flows out from the water passage opening around the structure, the accumulated rainwater can be gradually permeated and drained, and a large water storage capacity can be secured in one place, so that workability is improved. It is excellent, costs are lower than those that form drainage channels, and maintenance is easy.

  According to the structure of Claim 3, a structure can be supported stably by installing a block in a bottom slab concrete part, and uneven settlement etc. can be prevented. And the stability of a structure increases significantly compared with the case where the lower part of a structure is made into the water flow layer which consists of crushed stone, gravel, etc.

  According to the structure of Claim 4, it is excellent in intensity | strength and the structure provided with the wide water storage space is obtained. And in construction of this structure, a heavy machine is arrange | positioned between the standing positions of a block wall-like body, and a block wall-like body can be constructed by installing a block. Also, by inserting the bottom part of the block wall-like body into the groove part of the bottom slab concrete part, adjusting the height and filling the groove part with the filling material, the block wall-like body is installed in the bottom slab concrete part, and this state In the bottom slab concrete part, the load of the block wall-like body is applied from the entire bottom surface, so the bottom slab concrete part supports the block wall-like body by the whole groove part, and the load partially concentrated on the bottom slab concrete part is not applied. Can prevent uneven settlement.

  And since the rainwater inside permeates and flows out from the water passage opening around the structure, the accumulated rainwater can be gradually permeated and drained, and a large water storage capacity can be secured in one place, so that the workability is improved. Excellent in cost, lower in cost and easier to maintain than those forming a drainage channel.

  According to the configuration of claim 5, the bottom of the bottom slab concrete part is inserted into the groove part of the bottom slab concrete part, the height of the block wall body is adjusted, and the groove part is filled with the filling material. Since the body is installed and the load of the block wall-like body is applied to the bottom slab concrete part from the entire bottom surface in this state, the bottom slab concrete part supports the block wall-like body by the whole groove part and is partially concentrated on the bottom slab concrete part Load is not applied, and uneven settlement can be prevented.

  According to the structure of Claim 6, the performance of a formwork member as a both-ends support beam improves with a frame structure, and it can take widely between adjacent block wall-shaped bodies.

  According to the configuration of the seventh aspect, the bottom slab concrete portion supports the block wall-like body with the entire groove portion, and a load that is partially concentrated on the bottom slab concrete portion is not applied, so that uneven settlement or the like can be prevented.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, an unprecedented rainwater underground infiltration structure is obtained by adopting a rainwater underground infiltration structure different from the conventional one, and the rainwater underground infiltration structure and construction method are described respectively.

  Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to FIGS. 1 to 3 show a concrete block for an underground water storage tank according to the present embodiment, in which the concrete block 1 is made of a precast concrete block, and the corners of the square top plate 2 and bottom plate 3 are shown. The columnar portion 4 has a structure coupled in parallel, and this columnar portion 4 is formed by a wide width portion 4a on the front and rear side surfaces side and a narrow width portion 4b on the left and right side surfaces, thereby opening large openings on the left and right side surfaces. A portion 5 is formed and a small opening 6 is formed on the front and rear side surfaces. And the taper part 4t which expands toward the inner surface of the top plate 2 and the inner surface of the bottom plate 3 is formed in the up-and-down inner surface of the said columnar part 4. As shown in FIG.

  In the concrete block 1 as described above, in the drawing, the width (W1) in the left-right direction × the length (L1) in the front-rear direction × the height (H1), the width (W2) of the small opening 5 × the height (H2). The width (W3) × height (H2) of the large opening 6 is shown.

  Engagement step portions 7 that are engagement portions are formed at the left and right edges of the top plate 2, and the end portions of the plate-like formwork member 10 made of precast concrete are placed on the engagement step portions 7. . The formwork member 10 is integrally provided with a reinforcing bar truss 11 that is a frame structure continuous in the width direction of the formwork member 10. The reinforcing bar truss 11 is almost the same as the length of the mold member 10 in the width direction.

  As shown in FIGS. 4 and 5, the reinforcing bar truss 11 uses reinforcing bars as string members, and lower string members 13 and 13 are arranged on both lower sides of the upper string member 12, and these string members 12, 13 and 13 are triangular. At the position of the apex, it is integrally connected by connecting diagonal members 14, 14 on both sides, and this connecting diagonal member 14 is bent and formed into a triangular wave shape in which upper and lower apexes 14A, 14B are alternately formed in the length direction. The upper vertex 14A is welded to the upper chord material 12 by resistance spot welding, and the lower vertex 14B is welded to the lower chord material 13 by resistance spot welding. The rebar truss 11 is integrally provided on the mold member 10 with the lower chord members 13 and 13 embedded in the mold member 10 and the upper portion exposed at the upper portion of the mold member 10.

  Next, an underground water tank structure 21 using the concrete block 1 as described above will be described with reference to FIGS. The underground water tank structure 21 has the following configuration. The concrete block 1 is provided with block wall bodies 22, 22 in which a plurality of the concrete blocks 1 are connected in the length direction. In the block wall bodies 22, 22, the concrete blocks 1 are arranged in the front-rear direction, and the front surface 1m and the rear surface 1u are arranged. Butt and connect with a connector (not shown) if necessary. A plurality of the block wall-like bodies 22 and 22 are provided in parallel with a gap in the width direction. In the block wall-like body 22 located outside the structure body 21 in the width direction, the concrete blocks 1 arranged in the front-rear direction are mutually connected. The front surface 1m and the rear surface 1u are joined in a watertight manner.

  A bottom slab concrete portion 31 is provided at the bottom of the structure 21. Groove portions 32 and 32A for inserting the lower portion of the block wall-like body 22 are formed on the upper surface of the bottom slab concrete portion 31. The groove portion 32 in the center in the width direction of the structure 21 has a bottom surface 33 at a position lower than the upper surface of the bottom slab concrete portion 31, and step portions 34, 34 positioned on both sides of the bottom surface 33. A bottom surface 33 and a stepped portion 34 on the center side of the bottom surface 33 are provided. The width of the grooves 32 and 32A is formed wider than the width of the bottom of the concrete block 1, and between the grooves 32 and 32A and the bottom of the concrete block 1 is filled the interstitial concrete 35 serving as the interstitial material. A reinforcing bar 36 is disposed inside the bottom slab concrete portion 16. In addition, mortar etc. can be used as a filling material.

  The formwork member 10 is spanned between the top plates 2 and 2 of the adjacent block wall-shaped bodies 22 and 22, and the formwork members 10, 10.. On the members 10, 10..., Concrete is cast on site, and a top plate portion 17 in which the cast top plate concrete portion 16 and the formwork member 10 are integrated is formed.

  In addition, precast concrete wall blocks 41 are provided on the front, rear, left, and right sides around the structure 21. The wall block 41 includes a vertical wall portion 42 that covers the periphery of the structure 21, and the vertical wall portion 42. It is an L-shaped block having a bottom plate portion 43 provided integrally with the wall portion 42, and has a self-supporting property by placing the bottom plate portion 43 almost horizontally. The vertical wall portion 42 is provided with a plurality of holes 45 serving as openings for water passage of the structure 21, and the holes 45, 6, and the width of the block 1 positioned around the structure body 21. It communicates with the opening between the blocks 1 and 1 adjacent in the direction. Further, in the installed state, the upper end of the vertical wall portion 42 protrudes above the top plate 2, and the inner surface of the vertical wall portion 42 also serves as a formwork of the cast top concrete portion 16, as shown in FIG. The placement top concrete part 16 is placed in accordance with the height of the vertical wall part 42. In the figure, reference numeral 46 denotes a water-permeable layer made of crushed stone or gravel provided around the structure 21. In addition, the hole 45 which is a water flow opening is smaller than the large and small openings 5 and 6.

  Furthermore, the construction method of the underground water tank using the above concrete blocks 1 is demonstrated. First, the ground is floored to a predetermined depth, and crushed stone (not shown) is spread on the root of the root, and the water storage area A is defined by averaging. Next, on the water storage area A, a reinforcing bar 36 is arranged and concrete is placed to form a bottom slab concrete portion 31. In this case, the bottom slab concrete portion 31 corresponding to the size of the structure 21 is formed by placing the concrete approximately once in the entire water storage area A. After curing the bottom slab concrete part 31, the bottom part of the concrete block 1 is inserted into the groove parts 32, 32A and connected in the front-rear direction to assemble the block-like wall bodies 22, 22, and the height is adjusted to obtain the groove parts 32, 32A. Filled with stuffed concrete 35 and installed. In this case, since there is a wide space between the bottom slab concrete portions 31 of the adjacent block wall bodies 22, 22, a heavy machine (not shown) such as a crane is carried on the bottom slab concrete portion 31 and the concrete block 1 is lifted. Installation can be performed. Further, since the interstitial concrete 35 filled in the groove portions 32 and 32A is reliably filled between the bottom surface 33 of the groove portions 32 and 32A and the bottom plate 3 of the block, the concrete block 35 is cured after the interstitial concrete 35 is cured. A load of 1 is supported on the entire bottom surface 33. In the height adjustment of the concrete block 1, the heights of the stepped portions 7 and 7 of the adjacent block-like wall bodies 22 and 22 are matched. Then, the end portions in the width direction of the formwork member 10 are placed on the step portions 7 and 7 of the adjacent block-like wall bodies 22 and 22, so that the tops of the block wall-like bodies 22 and 22 adjacent in the width direction are placed. A form plate member 17 is formed by placing a form member 10 between the plates 2 and 2 and placing the concrete member 16 on the form member 10 and placing the concrete on the form member 10. Form. And the placing top plate concrete part 16 and the top plate 2 of the concrete block 1 are integrated, and the block wall-like bodies 22 and 22 and the top plate part 17 are integrated.

  Further, as to the periphery of the structure 21, the peripheral block 41 is arranged and closed in the left-right direction of the structure 21, and the inside and the outside are communicated by the hole 45. In this case, at least the vertical wall portion 42 of the peripheral block 41 is butted against the front and rear surfaces of the block wall-like body 22 on both sides in the left-right direction. As a result, a water storage space K that is continuous in the front, rear, left, and right is formed in the structure 21 without a backfill portion or the like.

  Then, a permeable layer 46 is formed around the structure 21 and backfilled to construct a rainwater underground infiltration structure. In this case, since the water flow layer 46 is formed on the bottom plate portion 43 of the peripheral block 41, the construction is facilitated. Such rainwater underground seepage structures are connected to rainwater inflow grooves formed at the edges of road shoulders or parking lots and facilities for collecting rainwater such as manholes, and from such rainwater collection facilities during heavy rain, It flows into the internal water storage space K and is stored. The stored rainwater is gradually permeated and drained into the ground through the water passage 46 from the holes 45 formed around the structure 21.

  Thus, in this embodiment, corresponding to claim 1, a box-type precast concrete having openings 5 and 6 on the side surfaces in which the corners of the square top plate 2 and the bottom plate 3 are coupled in parallel by the columnar portion 4. A plurality of blocks 1 are formed, and the concrete block 1 is arranged in the length direction and the width direction, and has a water storage space continuous in the length direction and the width direction. By providing a hole 45 as an opening and allowing the rainwater inside the structure 21 to permeate and flow out from the opening 45, the structure 21 has a large water storage capacity in one place. Since rainwater inside permeates and flows out from the hole 45 serving as the water passage opening, the accumulated rainwater can be gradually permeated and drained. And since the concrete blocks 1 are arranged in the length direction and the width direction, and a large water storage capacity can be secured in one place, the workability is excellent, the cost is low compared to the one that forms the drainage channel, and maintenance is also possible. It becomes easy.

  In this way, in this embodiment, in correspondence with claim 2, a box-type having openings 5 and 6 on the side surfaces in which the corners of the square top plate 2 and the bottom plate 3 are coupled in parallel by the columnar portion 4. A plurality of precast concrete blocks 1 are formed, and a block wall-like body 22 is provided in which a plurality of the concrete blocks 1 are connected in the length direction, and a plurality of block wall-like bodies 22 are provided at intervals in the width direction. Forming member formed by placing a formwork member 10 between the top plates 2 and 2 of the block wall bodies 22 and 22 adjacent to each other in the direction, and placing concrete on the formwork member 10 and the formwork member 10 The structure 21 is formed with a top plate portion 17 composed of a top plate concrete portion 16, and a hole 45 serving as a water passage opening is provided around the structure 21, and the inside of the structure is formed from the opening 45. Since rainwater can be permeated and discharged, the structure for underground water tanks obtained in this way is used. Body 21, together with the space is formed wider between the wall-like member 22, space occupancy is reduced greatly because it is box-shaped having an opening 5, 6 in the concrete block 1 itself side. Further, since the upper portions of the block wall bodies 22, 22 are integrated by the top plate portion 17 and the lower portions of the block wall bodies 22, 22 are integrated with the bottom plate concrete portion 31, the structure 21 Has a structure that is strong against lateral loads, and has a structure that is earthquake resistant to rolling such as earthquakes.

  In addition, the structure 21 has a large water storage capacity in one place, and is configured to allow the rainwater inside the structure to permeate and flow out from the opening 45 around the structure 21. Since the rainwater inside permeates and flows out from the hole 45 as the opening, the accumulated rainwater can be gradually permeated and drained. And since the concrete blocks 1 are arranged in the length direction and the width direction, and a large water storage capacity can be secured in one place, the workability is excellent, the cost is low compared to the one that forms the drainage channel, and maintenance is also possible. It becomes easy.

  Further, in this embodiment, since the bottom slab concrete portion 31 is formed at the bottom of the structure 21 in accordance with the third aspect, the structure 21 is mounted by installing the block 1 on the bottom slab concrete portion 31. It can support stably and can prevent uneven settlement. In addition, the stability of the structure 21 is significantly increased as compared with the case where the lower portion of the structure 21 is a water-permeable layer made of crushed stone or gravel.

  In this way, in this embodiment, corresponding to claim 4, a box-type having openings 5, 6 on the side surfaces in which the corners of the square top plate 2 and the bottom plate 3 are coupled in parallel by the columnar portions 4. A plurality of precast concrete blocks 1 are formed, and a block wall-like body 22 is provided in which a plurality of the concrete blocks 1 are connected in the length direction, and a plurality of block wall-like bodies 22 are provided at intervals in the width direction. A structure 21 in which a top plate portion 17 is formed between the top plates 2 and 2 of the block wall-like body 22 adjacent to each other in the direction, and a bottom plate concrete portion 31 is formed at the bottom of the structure body 21, and this bottom plate concrete portion Since the groove portion 32 into which the bottom portion of the block wall-like body 22 is inserted is formed on the upper surface of 31, an underground water storage tank having excellent strength and a wide water storage space can be obtained. In the construction of the underground water storage tank, the block wall-like body 22 can be constructed by placing a heavy machine between the standing positions of the block-wall-like body 22 and installing the block 1. In addition, the bottom wall of the bottom slab concrete part 31 is inserted into the groove part 32 of the bottom slab concrete part 31 and the height of the block wall body 22 is adjusted to fill the groove part 32 with the interstitial concrete 35. 22 is installed, and in this state, the load on the block wall body 22 is applied to the bottom slab concrete portion 31 from the entire bottom surface thereof, so the bottom slab concrete portion 31 supports the block wall body 22 on the entire bottom surface 33 of the groove portion 32, A load that is partially concentrated on the bottom slab concrete portion 31 is not applied, and uneven settlement can be prevented.

  In this way, in this embodiment, the groove portion 32 for inserting the bottom portion of the block wall-shaped body 22 is formed on the upper surface of the bottom slab concrete portion 31 in correspondence with the fifth aspect. Therefore, the groove portion 32 of the bottom slab concrete portion 31 is formed. The block wall-like body 22 is installed in the bottom slab concrete portion 31 by inserting the bottom of the block wall-like body 22 and adjusting the height, and filling the gap 32 with the interstitial concrete 35. Since the load of the block wall body 22 is applied to the concrete portion 31 from the entire bottom surface, the bottom slab concrete portion 31 supports the block wall body 22 on the entire bottom surface 33 of the groove portion 32 and is partially concentrated on the bottom slab concrete portion 31. Load is not applied, and uneven settlement can be prevented.

  As described above, in this embodiment, the rebar truss 11 that is a framework structure is provided in the mold member 10 in correspondence with the sixth aspect. Therefore, the rebar truss 11 improves the performance of the mold member 10 as both-end support beams, The space between adjacent block walls 22, 22 can be widened.

  Thus, in the present embodiment, in correspondence with claim 7, after the bottom slab concrete portion 31 having the groove portion 32 on the upper surface is formed, the bottom portion of the block wall-shaped body 22 is inserted into the groove portion 32, and the bottom portion and the groove portion. After filling the interstitial concrete 35, which is the interstitial material, between 32, the formwork member 10 is bridged between the top plates 2, 2 of the block wall-like bodies 22, 22 adjacent in the width direction, and then the formwork member Concrete is cast on 10 to form the top plate portion 17, so that the bottom plate concrete portion 31 supports the block wall 22 in the entire groove portion 32, and a partially concentrated load is applied to the bottom plate concrete portion 31. It is possible to prevent uneven settlement. Further, when the mold member 10 itself constitutes a part of the top plate portion 17, it is not necessary to assemble and remove the mold at the site, and the construction cost at the site can be reduced.

  Further, as an effect of the embodiment, the concrete block 1 is a box having openings 5 and 6 on the side surfaces in which the corners of the square top plate 2 and the bottom plate 3 are coupled in parallel by the columnar portions 4, 4, 4, 4. Since it is composed of a precast concrete block 1 of the mold, and an engagement step portion 7 that is an engagement portion with which the edge of the mold member 10 engages is formed on the edge of the top plate 2, a plurality of the concrete blocks 1 are connected in the length direction. The block wall-like bodies 22 and 22 are erected, and a plurality of block wall-like bodies 22 and 22 are provided at intervals in the width direction so that the edge of the mold member 10 is between the adjacent block wall-like bodies 22 and 22. Is engaged with the engaging step 7 of the top plate 2, the formwork member 10 is passed over, concrete is placed on the formwork member 10, and the formwork member is placed on the upper part of the block wall-like body 22. 10 and the top plate placing concrete part 16 can be integrated to construct the underground water tank structure 21. . The underground water tank structure 21 thus obtained has a wide space between the wall-like bodies 22 and is a box shape having openings 5 and 6 on the side surface of the concrete block 1 itself. Occupancy rate is greatly reduced. Further, since the upper portions of the block wall bodies 22, 22 are integrated by the top plate portion 17 and the lower portions of the block wall bodies 22, 22 are integrated with the bottom plate concrete portion 31, the structure 21 Has a structure that is strong against lateral loads, and has a structure that is earthquake resistant to rolling such as earthquakes.

  Further, as an effect of the embodiment, the frame structure is the reinforcing bar truss 11, and a part of the reinforcing bar truss 11 protrudes from the upper part of the mold member 4, so that the frame member 4 has a long span as both-end support beams. In addition, since a part of the reinforcing bar truss 11 is embedded in the placing concrete portion 5, the formwork member 4 and the placing concrete portion 5 can be integrated.

  FIG. 12 shows a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and the detailed description thereof is omitted. If it is a slit 47 and rainwater can flow out in this way and the water passage layer 46 does not enter inside, the opening is not a hole or a vertical slit, but a square hole, a horizontal slit, a vertical hole, a horizontal It may be a hole.

  FIG. 13 shows a third embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-mentioned embodiments, and detailed description thereof will be omitted. In this example, one large opening of the concrete block 1 is shown. A blocking plate 61 is provided in the portion 5 to close it, and the block 1 is provided on both sides of the structure 21 in the width direction, and a hole 45 serving as a water passage opening 45 is formed in the blocking plate 61. It is not necessary to use the surrounding block 41.

  FIG. 14 shows a fourth embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-mentioned embodiments, and detailed description thereof will be omitted. In this example, one large opening of the concrete block 1 is shown. The block 5 is provided with a closing plate portion 61 to block it, and the block 1 is provided on both sides of the structure 21 in the width direction, and the closing plate portion 61 is formed with slits 47 which are openings 45 for water passage. It is not necessary to use the surrounding block 41.

  15 to 16 show a fifth embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. In this example, compared with the first embodiment, FIGS. The height of the concrete block 1 is reduced to the height (H1), and the height is changed by shortening the columnar portion 4, and the structure body can be obtained simply by changing the length of the columnar portion 4 in this way. The height of 21 can be changed according to the design. For example, the structure 21 is set at a predetermined pitch of 500 mm.

  Also in this example, the rain water stored in the water storage space K can be gradually permeated and drained by providing the water flow openings around the front and rear, right and left of the structure 21 and providing the water flow layer 46.

  17 to 21 show Embodiment 6 of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. In this example, compared with Embodiment 1, The height of the concrete block 1 is high and the height (H1) is changed, and the height is changed by elongating the columnar portion 4. Thus, the structure 21 can be obtained simply by changing the length of the columnar portion 4. The structure 21 is set at a predetermined pitch of 500 mm, for example. Further, the columnar portions 4 and 4 adjacent between the top plate 2 and the bottom plate 3 are connected by a horizontal beam portion 51 which is a reinforcing portion. On both sides of the horizontal crosspiece 51, tapered portions 4t that expand toward the inner surface of the columnar portion 4 are formed.

  Also in this example, the rain water stored in the water storage space K can be gradually permeated and drained by providing the water flow openings around the front and rear, right and left of the structure 21 and providing the water flow layer 46.

  Moreover, since the columnar part 4 which adjoins between the top plate 2 and the baseplate 3 is connected by the reinforcement part as an effect on an Example, when an underground water tank is high and a columnar part becomes long, reinforcement By providing the horizontal crosspiece 51 as a part, buckling of the columnar part 4 with respect to a vertical load can be prevented, and the strength can be effectively improved.

  FIG. 22 shows a seventh embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. When the top plate portion 17A of this example is arranged in the width direction, FIG. Concrete precast top plate members 61, 62 are formed between the top plates 2, 2 of the adjacent block wall bodies 22, 22. An engaging portion 63 that engages with the stepped portion 7 is formed. Therefore, in the construction of the top plate portion 17A, it is not necessary to place concrete on site.

  Thus, in this embodiment, corresponding to claim 4, a box-type precast concrete having openings 5 and 6 on the side surfaces in which the corners of the square top plate 2 and the bottom plate 3 are connected in parallel by the columnar portions 4. A plurality of blocks 1 are formed, and a plurality of block walls 22 are connected to each other in the length direction, and a plurality of block walls 22 are provided at intervals in the width direction. A structure 21 in which a top plate portion 17A is formed between the top plates 2 and 2 of adjacent block wall-shaped bodies 22, and a bottom slab concrete portion 31 is formed at the bottom of the structure 21, and the bottom slab concrete portion 31 On the upper surface, a groove portion 32 for inserting the bottom portion of the block wall-like body 22 is formed, and a hole 45 serving as a water passage opening is provided around the structure body 21, and the rainwater inside the structure body 45 permeates and flows out from the hole 45. Because it is configured to be possible, it is excellent in strength and has a large water storage space. Is obtained. And in construction of this structure 21, a heavy machine is arrange | positioned between the standing positions of the block wall-like body 22, the block 1 can be installed, and the block wall-like body 22 can be constructed. Further, by inserting the bottom portion of the block wall-like body 22 into the groove portions 32, 32A of the bottom slab concrete portion 31, adjusting the height, and filling the groove portion 32, 32A with the interstitial concrete 35 as the interstitial material, the bottom plate Since the block wall-like body 22 is installed on the concrete portion 31, and the load of the block wall-like body 22 is applied to the bottom slab concrete portion 31 from the entire bottom surface in this state, the bottom slab concrete portion 31 is blocked by the entire groove portions 32, 32A. The load 22 is supported, and a partially concentrated load is not applied to the bottom slab concrete portion 31, so that uneven settlement or the like can be prevented.

  In addition, the structure 21 has a large water storage capacity in one place, and is configured to allow the rainwater inside the structure to permeate and flow out from the opening 45 around the structure 21. Since the rainwater inside permeates and flows out from the hole 45 as the opening, the accumulated rainwater can be gradually permeated and drained. And since the concrete blocks 1 are arranged in the length direction and the width direction, and a large water storage capacity can be secured in one place, the workability is excellent, the cost is low compared to the one that forms the drainage channel, and maintenance is also possible. It becomes easy. Further, in this example, in the construction of the top plate portion 17A, it is not necessary to place concrete on site, and the construction period can be further shortened.

  As mentioned above, although each Example of this invention has been described with reference to an accompanying drawing, this invention is not limited to the said Example, A various deformation | transformation implementation is possible. For example, it is not always necessary to provide block wall-like bodies on both sides in the left-right direction of the structure, and the left and right surfaces of the structure may be closed with other blocks such as the surrounding block 41. Further, the front and back of the structure 21 may be closed with on-site cast concrete, and at that time, a water passage opening may be formed on the on-site cast concrete. Furthermore, the bottom slab concrete portion can be formed by in-situ concrete, formed by a precast concrete block, or can be formed by combining in-situ concrete and a precast concrete block.

It is a perspective view of the concrete block for underground water tanks by Example 1 of the present invention. It is a front view of a concrete block same as the above, and has illustrated by making the bottom slab concrete part into a cross section. It is a side view of a concrete block same as the above. It is a perspective view of a frame structure same as the above. It is a sectional view of the important section of a formwork member same as the above. FIG. 3 is a partially cutaway perspective view of the underground water tank structure. It is sectional drawing of the width direction (left-right direction) of the structure for underground water tanks same as the above. It is sectional drawing of the length direction (front-back direction) of the structure for underground water tanks same as the above. It is a top view of the structure for underground water tanks same as the above. It is a perspective view of the surrounding block which provided the opening part for water flow same as the above. It is sectional drawing which shows the installation state of the groove part of a bottom slab concrete part, and the bottom part of a block same as the above. It is a perspective view of the surrounding block which provided the opening part for water flow which shows Example 2 of this invention. It is a perspective view of the concrete block which shows Example 3 of this invention. It is a perspective view of the concrete block which shows Example 4 of this invention. It is sectional drawing of the width direction (left-right direction) of the structure for underground water tanks which shows Example 5 of this invention. It is sectional drawing of the length direction (front-back direction) of the structure for underground water tanks same as the above. It is a perspective view of the concrete block for underground water tanks by Example 6 of this invention. It is a front view of a concrete block same as the above, and has illustrated by making the bottom slab concrete part into a cross section. It is a side view of a concrete block same as the above. It is sectional drawing of the width direction (left-right direction) of the structure for underground water tanks same as the above. It is sectional drawing of the length direction (front-back direction) of the structure for underground water tanks same as the above. It is sectional drawing of the width direction (left-right direction) of the structure for underground water tanks by Example 7 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete block 2 Top plate 3 Bottom plate 4 Column-shaped part 5 Large opening part 6 Small opening part 7 Step part (engagement part)
10 Formwork members
11 Reinforcing bar truss (frame structure)
16 Casting top slab concrete section
17 Top plate
17A top plate
21 Structure
22 Block wall
31 Bottom slab concrete section
32, 32A groove
35 Filling concrete (filling material)
51 Horizontal rail (reinforcement)
45 holes (water flow opening)
46 Water flow layer
47 Slit (Water flow opening)
A water storage area

Claims (7)

A plurality of box-shaped precast concrete blocks having openings on the side surfaces of the square top plate and the bottom plate connected in parallel at the columnar portions are formed, and the concrete blocks are arranged in the length direction and the width direction. A structure having a water storage space continuous in the width direction, characterized in that a water passage opening is provided around the structure, and rainwater inside the structure can be permeated and discharged from the opening. Rainwater underground seepage structure. A plurality of box-shaped precast concrete blocks having openings on the side surfaces of the corners of the square top plate and the bottom plate connected in parallel with columnar portions are formed, and a plurality of block walls connected in the length direction are formed. A plurality of the block wall-like bodies are provided at intervals in the width direction, and a formwork member is stretched between the top plates of the block wall-like bodies adjacent to each other in the width direction. A structure in which a top slab part formed by placing concrete on a formwork member is formed, and a water passage opening is provided around the structure, and the opening A rainwater underground infiltration structure characterized in that rainwater inside the structure can be infiltrated and discharged from the section. The rainwater underground infiltration structure according to claim 1 or 2, wherein a bottom slab concrete part is formed at the bottom of the structure. A plurality of box-shaped precast concrete blocks having openings on the side surfaces of the corners of the square top plate and the bottom plate connected in parallel with columnar portions are formed, and a plurality of block walls connected in the length direction are formed. A structure in which a plurality of the block wall bodies are provided at intervals in the width direction, and a top plate portion is formed between the top plates of the block wall bodies adjacent in the width direction. A bottom slab concrete portion is formed at the bottom of the structure, and a groove for inserting the bottom of the block wall-like body is formed on the top surface of the bottom slab concrete portion, and a water passage opening is provided around the structure. A rainwater underground infiltration structure characterized in that rainwater inside the structure can be infiltrated and discharged from the opening. The rainwater underground infiltration structure according to claim 3, wherein a groove portion for inserting the bottom portion of the block wall-like body is formed on the upper surface of the bottom slab concrete portion. The rainwater underground infiltration structure according to claim 2 or 5, wherein a frame structure is provided on the formwork member. In the construction method of the rainwater underground infiltration structure according to claim 4 or 5, after forming the bottom slab concrete part having the groove part on the upper surface, the bottom part of the block wall-like body is inserted into the groove part, and this A method for constructing a rainwater underground infiltration structure, wherein a filling material is filled between a bottom portion and a groove portion to form the top plate portion.

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