JP2891079B2 - Underground burial pond - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried underground type pond that is preferably used for temporarily storing a large amount of rainwater.

2. Description of the Related Art In recent years, a retarding pond has been installed underground, and its upper surface has been used as an artificial base. In general, a conventional basin is generally constructed by cast-in-place concrete or by arranging box-shaped precast box culverts side by side.

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 column members are relatively complicated in shape and large in number, skilled workers are indispensable for formwork and reinforcing steel work for constructing the column members, and a lot of time is spent on site construction. Will be. On the other hand, in the case of using a precast box culvert, the construction period can be shortened as compared with the case of cast-in-place, but since the box-shaped box culverts are juxtaposed, the side walls have to be of a double structure. For this reason, the amount of water stored is reduced and more materials are required than necessary, which is unavoidable. Also,
The double wall formed by juxtaposing the box culverts complicates the structure of the inside of the retarding basin, and also causes a problem that it takes time to maintain and manage the inside cleaning and the like. The present invention has been made in view of such problems, it is possible to shorten the construction period without compromising the good construction state while eliminating or minimizing the skilled workers as described above, and In addition to eliminating waste of materials, the construction of an underground ponding basin that can simplify the internal structure and facilitate maintenance and maintenance, and is also convenient for transporting materials to the construction site, etc. It is intended to provide.

In order to achieve the above object, the present invention takes the following measures. That is, the underground buried retarding pond according to the present invention, a peripheral wall constituted by a precast concrete block,
A plurality of pillar members made of precast concrete blocks that are self-supporting at predetermined intervals in a water storage area surrounded by the peripheral wall, and are cast at the bottom of the water storage area so that lower end pillar portions of these pillar members are buried. A bottom plate made of cast-in-place concrete, and a lid supported on the upper end surface of the column member and the upper end surface of the peripheral wall and covered on the water storage area, and an outer surface of a lower end column portion of the column member With a streak,
The portion protruding outside the streak is buried in a bottom slab made of cast-in-place concrete. As a preferable form of the column member, there can be cited one having a receiving portion for receiving the lid at the upper end, and having a conical-shaped portion having a gradually increasing cross-sectional area downward at the lower end. .
In this case, when it is desired to be able to apply to the retarding ponds having various depth dimensions, the upper half portion including the pedestal portion of the column member and the lower half portion including the cone-shaped portion are placed on top and bottom. It is desirable to make it separable. Since the peripheral wall has a relatively simple shape, the peripheral wall may be constructed of cast-in-place concrete instead of being formed of a precast concrete block.

With such a construction, a precast concrete block is arranged in a borehole to form a peripheral wall, and a plurality of column members are self-supported inside the peripheral wall, and thereafter, are surrounded by the peripheral wall. The perimeter wall, the bottom slab, and the column member are integrated simply by casting concrete on the bottom of the reserved water storage area to form the bottom slab, and the lid is placed thereon to complete the retarding basin. Therefore, the concrete is cast at the site only when the bottom slab which does not require the formwork is formed, and it is not necessary to rely on skilled workers as in the prior art. In addition, since only the pillar members for supporting the overloaded load are erected at predetermined intervals in the retarding basin, there is no waste of material as in the case where a double wall portion is formed inside. There is no use, and the inside can be easily cleaned. In particular, if the lower half of the column member has a pyramid shape, there will be no recessed corner at an angle equal to or less than a right angle between the outer periphery of the column member and the column member and the bottom plate, The inside of the retarding basin can be efficiently cleaned using a cleaning device having a rotating brush or the like. Such a pillar member has a shape in which the bottom plate is formed separately, so that it can be manufactured in a smaller formwork than the one in which the bottom plate is integrated at the time of manufacturing at a factory, and is stored after manufacturing. It is also possible to store a large area in a small area. In addition, when the product is shipped from the factory, it is easy to carry the cargo because of its low bulk, and it is possible to carry it while carrying it at a high density. In addition, at the site, the column member is lightweight because the bottom plate is a separate body, so that small transport construction is easy and labor costs are reduced. Moreover, at the time of construction, since the contact area of the column member with the foundation concrete, that is, the ground contact area of the lower end column portion is small, even if the foundation concrete has irregularity, the irregularity under the column member is stochastically small, It is easy to vertically stand the column members. In this case, since the ground contact area is small, it is easy to take measures such as embedding a steel plate for vertical installation adjustment at the time of placing the foundation concrete at the foundation concrete position corresponding to immediately below the column member. Moreover, in spite of the small ground contact area, the present invention projects the reinforcement from the outer surface of the lower end column portion of the column member and buries it in the cast-in-place concrete bottom slab. And the degree of coupling with the polymer can be effectively increased. At this time, since the reinforcing bars are provided at the lower pillar portion of the pillar member, the reinforcing bars can be left unattached to the pillar member until brought to the site,
The bulkiness during storage and transportation described above can be reduced more effectively. Further, since the bottom slab is formed by casting a large amount of concrete in a wide area on the site, it is possible to improve the familiarity between the bottom slab and the foundation concrete. In particular, when the bottom area is large, the better the familiarity with the foundation ground, the greater the stabilizing effect in supporting force. Also, if the lid is supported by pillar members instead of walls, the visibility inside the retarding basin will be good, so when introducing water, it is necessary to check whether workers remain inside. It becomes easy to confirm. That is, this kind of retarding basin may be used, for example, as a disaster prevention pond, and in this case, it is conceivable that water is poured immediately after the cleaning operation. 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 a worker to confirm the operation and high security can be ensured. Even when the surrounding wall is constructed from cast-in-place concrete instead of the precast concrete block, since the surrounding wall has a relatively simple shape, the skill is not much used for formwork work. Therefore, even in this case, it is possible to reduce the number of skilled workers and shorten the construction period.

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 8, this underground buried reservoir is made of a precast concrete block which is made upright at predetermined intervals in a surrounding wall 1 formed of a precast concrete block and a water storage area 2 surrounded by the surrounding wall 1. A plurality of pillar members 3, a bottom plate 4 made of cast-in-place concrete cast at the bottom of the water storage area 2 so as to bury the lower pillar portions of the pillar members 3, and an upper end surface 3 a of the pillar member 3 And a lid 5 supported on the upper end surface 1a of the peripheral wall 1 and covered on the water storage area 2. More specifically, as shown in FIGS. 2 and 7, the peripheral wall 1 includes a plurality of wall members 6 made of a precast concrete block and a plurality of wall members 6 made of a precast concrete block.
Each of the corner members 7 is tightly and liquid-tightly connected to each other by a suitable connecting means (not shown) such as a PC steel material, and is mounted on a horizontal foundation (not shown) formed at the bottom of the drilling hole. Is established.
As shown in FIG. 3, the wall member 6 is a plate-like member having a thickened lower end portion 6a, and has an insert for mounting a streak 8 on the inner surface of the lower end portion 6a. As shown in FIG. 4, the corner members 7 are disposed at the four corners of the peripheral wall 1, have an L shape in plan view, and are used to mount the streaks 8 on the inner surface of the thickened lower end 7 a. Is provided. As shown in FIG. 5, the column member 3 has a rectangular base-shaped receiving portion 3b.
An intermediate prism portion 3c provided continuously at the lower end of the pedestal portion 3b; and a cone-shaped portion 3d provided continuously at the lower end of the intermediate prism portion 3c and having a gradually increasing sectional area downward. And a lower end prism portion 3e provided continuously to the lower end of the cone-shaped portion 3d. The intermediate prism portion 3c has a square cross section, and one side dimension of the intermediate prism section 3c matches the one side dimension of the upper end of the cone-shaped portion 3d. The cone-shaped portion 3d has a shape in which the tip of a regular quadrangular pyramid is cut off, and each section has a square cross section. The lower end prism portion 3e has a square cross section, and one side dimension thereof is matched with one side dimension of the lower end of the cone-shaped portion 3d. On the outer surface of the lower end prism portion 3e, an insert for mounting the streak 9 is provided. As shown in FIG.
As shown in the figure, it is made of precast concrete,
It has a square disk shape in plan view. One side of the lid 5 corresponds to the arrangement pitch of the column members 3. Although not shown in FIG. 1, the predetermined lid 5 is provided with an entrance and the like for an operator to enter and exit. This retarding pond is constructed in the following procedure. First, an excavation hole of the required depth is provided in the ground, and a horizontal foundation is formed at the bottom of the excavation hole. Thereafter, a plurality of wall members 6 are placed on the foundation.
And four corner members 7 are arranged, and the wall members 6
In addition, the wall member 6 and the corner member 7 are liquid-tightly connected to each other with a PC steel material or the like to form the peripheral wall 1. Further, a plurality of pillar members 3 are made to stand on the water storage area 2 surrounded by the peripheral wall 1 at the same pitch vertically and horizontally (see FIG. 7). And each of these pillar members 3
A reinforcing bar is attached to the bottom of the water storage area 2 by using a reinforcing bar 9 attached to the lower prism portion 3e and a reinforcing bar 8 attached to the inner surface of the lower end of the wall member 6 and the corner member 7. To form the bottom plate 4. At the stage where the cast-in-place concrete hardens and develops strength, the peripheral wall 1 and the column member 3 are integrated via the bottom slab 4 to be in a state where water can be stored (see FIGS. 2 and 8). The bottom slab 4 is cast in such a thickness that the lower end prism portion 3e as the lower end pillar portion of the column member 3 is buried. Then, the upper end surface 1a of the peripheral wall 1 and the upper end surface 3 of the column member 3
The water reservoir is completed by placing the lids 5 on the upper end surfaces 3a of the adjacent column members 3 and closing the water storage area 2 (see FIG. 1). Since one side of the lid 5 corresponds to the arrangement pitch of the column members 3, the corner portions of the four lids 5 are placed on each column member 3. So, with such a configuration,
Casting concrete on site is a bottom slab that does not require a formwork 4
It is sufficient only at the time of forming, so that a skilled worker such as a form carpenter is not required. In addition, since the bottom member 4 has a shape in which the bottom plate 4 is a separate body, a large area can be stored in a small area even when stored in a factory, and the storage efficiency can be increased.
Also, when the column members 3 are shipped from the factory, the loading is easy, and the pillar members 3 can be loaded and transported at high density. Such an effect is effectively enhanced also by the fact that the streaks 9 used for assisting the connection between the column member 3 and the bottom plate 4 can be inserted into the column member 3 at an appropriate time. It is what is being done. Further, at the site, the column member 3 is lightweight because the bottom plate 4 is a separate body, which facilitates small transportation work, reduces labor costs, and is less affected by unevenness. Bottom plate 4 via streaks 9
Can be reliably connected. Moreover, since the column members 3 for supporting the overloaded load are only erected at predetermined intervals in the retarding basin, a material similar to the case where a double wall portion is formed therein is used. There is no waste, and the inside can be easily cleaned. In particular, since the lower half of the column member 3 is formed in a cone shape, there is an inner corner portion that is recessed at an angle smaller than a right angle between the outer periphery of the column member 3 and the column member 3 and the bottom plate 4. Will not do. Therefore, the inside of the retarding pond can be efficiently cleaned using a cleaning device having a rotating brush. In addition, if the lid 5 is supported by the column member 3 instead of the wall, the visibility of the inside of the retarding basin becomes better, so that evacuation contact and confirmation of the worker immediately before introducing the water into the inside are performed. This can be performed easily and reliably, and safety can be dramatically improved. In the illustrated embodiment, a case has been described in which the same number of pillar members and wall members are arranged vertically and horizontally to construct a water-reservoir having a square shape in plan view, but the present invention is not necessarily limited to such a structure. Alternatively, the number of rows and columns may be different to form a rectangular shape in plan view. Or,
The shape of the corner member may be changed to have a polygonal shape other than a quadrangle when viewed in a plan view, or the wall member may be formed into a curved shape so as to be circular or oval in plan view. Further, the peripheral wall may be constructed of cast-in-place concrete, and in that case, a more free overall shape can be realized. Further, the column members are not limited to those in the illustrated embodiment, and may have a circular cross-section or the like. FIG.
As shown in the pillar member 3, the upper half portion 3A _(3A 1 to 3 A
₃ ) and the lower half 3B may be configured to be separable. Here, the upper half 3A comprises a pedestal portion 3b and an intermediate prism portion 3c, and the lower half 3B comprises a cone-shaped portion 3d and a lower end prism portion 3e. This way, for example,
As upper half 3A, several kinds of by preparing those having a height dimension (3A 1 ~3A _3), various intracisternal height be used in lower half 3B are common It is possible to easily construct a retarding basin having the above. In addition, various modifications can be made without departing from the spirit of the present invention.

As described above, the present invention can be constructed while omitting or reducing the on-site formwork and complicated rebar work, and can be constructed quickly without requiring many skilled workers. And it can be constructed reliably. In addition, since there are only pillar members inside and no double walls at all, maintenance management such as internal cleaning is easy, and in addition, communication and confirmation of workers who entered inside Etc. can be performed reliably, and the effect that the safety can be enhanced without difficulty is exhibited. In addition, since the bottom member has a separate bottom plate, a large area can be stored in a small area when storing it after manufacturing at the factory, so the sorting and alignment method is easy and product management Can be facilitated. In addition, when the product is shipped from the factory, the loading becomes easy, and the product can be loaded and transported at a high density.
Further, at the site, the column member is lightweight because the bottom slab is separate, so that small transport construction is easy and labor costs can be reduced. In addition, at the time of construction, since the contact area of the column member with the base concrete, that is, the ground contact area of the lower end column portion is small, even if the base concrete has irregularity, the irregularity under the column member is stochastically small. The column members can be easily erected vertically. In this case, since the ground contact area is small, it is possible to take measures such as embedding an iron plate for vertical installation adjustment at the time of placing the basic concrete at the position of the basic concrete corresponding to immediately below the column member. In addition, despite the small ground contact area, the column members are connected to the bottom slab via the reinforcing bars, so that the self-standing strength of the column members can be effectively increased. At that time, the above-mentioned streak is not embedded at the time of molding of the pillar member, but is inserted into the lower pillar portion at an appropriate time after the fact, and it should not be attached to the pillar member until brought to the site. Therefore, the bulkiness during storage and transportation described above can be reduced more effectively. In addition, since the bottom slab is formed by casting a large amount of concrete over a wide area at the site,
It becomes possible to improve the familiarity between the bottom slab and the foundation concrete. In particular, in a structure having a large bottom area, such as a retarding pond, the better the familiarity with the foundation ground, the greater the stabilizing effect in the bearing capacity.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a stage before the lid of the embodiment is covered.

FIG. 3 is an exemplary perspective view showing a wall member forming a peripheral wall according to the embodiment;

FIG. 4 is a perspective view showing a corner member forming a peripheral wall of the embodiment.

FIG. 5 is a perspective view showing a column member of the embodiment.

FIG. 6 is a perspective view showing a lid according to the embodiment.

FIG. 7 is an exemplary perspective view showing the construction process of the embodiment.

FIG. 8 is a perspective view showing a construction process of the embodiment.

FIG. 9 is an exploded perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Peripheral wall 1a ... Upper end surface 2 ... Water storage area 3 ... Column member 3A ... Upper half part 3B ... Lower half part 3a ... Upper end surface 3b ... Cradle part 3c ... Intermediate prism part 3d ... Conical shape part 3e ... Lower end column part (Bottom prism portion) 4 Bottom plate 5 Lid 6 Wall member 6 a Lower end 7 Corner member 7 a Lower end 9 Strut

Claims (4)

(57) [Claims] 1. A peripheral wall constituted by a precast concrete block, a plurality of column members made of a precast concrete block which are self-supported at predetermined intervals in a water storage area surrounded by the peripheral wall, and a lower end column portion of the column member. A bottom slab made of cast-in-place concrete poured into the bottom of the water storage area so as to be buried therein, and a lid body supported on the upper end face of the column member and the upper end face of the peripheral wall and covered on the water storage area. The outer surface of the lower pillar portion of the pillar member
Install a streak, and attach the protruding part outside this
An underground ponding basin characterized by being buried in a base made of cast concrete . 2. The method according to claim 1, wherein the column member has a pedestal portion at an upper end for receiving the lid, and a conical portion having a gradually increasing cross-sectional area downward at a lower end side. Claim 1
Underground buried ponds described. 3. The underground burial according to claim 2, wherein an upper half portion including the pedestal portion of the column member and a lower half portion including the conical portion are separable upward and downward. Reservoir. 4. A surrounding wall made of cast-in-place concrete, and a plurality of pillar members made of a precast concrete block which are self-supported at predetermined intervals in a water storage area surrounded by the surrounding wall;
A bottom slab made of cast-in-place concrete poured into the bottom of the water storage area so as to bury the lower end column portions of these pillar members, and supported on the upper end face of the pillar member and the upper end face of the peripheral wall to be on the water storage area. it was and a Futagi the lid, before
A reinforcing bar is provided on the outer surface of the lower pillar portion of the pillar member.
Cast-in-place concrete bottom on the outside of the streaks
An underground buried pond characterized by being buried in the plate .