JP3756889B2 - Kamaba drainage box - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage box for a rotary stove at a construction site of an underground structure.
[0002]
[Prior art]
As is well known, groundwater drainage measures are essential for the construction of underground structures such as basements. In an ordinary underground construction site, for example, a basement site, a basement slab is first constructed. In this case, drainage is also performed during excavation work of the ground, but after the excavation inside the steel sheet pile is finished, as shown in FIG. 5 (a), along the steel sheet pile 61 on the bottom ground of the ground. The drainage groove 62 is provided in the ground, and the groundwater collected thereby is drained to the ground surface by the drainage pump 63.
[0003]
Groundwater that has flowed into the drainage ditch 62 from the ground is gathered in a cradle 65 provided at an important point through a guide water channel 64 and drained by a drainage pump 63 installed here.
[0004]
As shown in FIG.5 (b), since the underground slab 60 is constructed | assembled on this, the drainage groove | channel 62 and the induction | guidance | derivation water channel 64 are embed | buried so that what closed the water distribution pipe or the side groove may be continued. By adopting those provided with through-holes through which groundwater flows in everywhere in the drainage grooves 62 and the guide water channel 64, the groundwater flowing into the bottom ground or springing up can be collected.
[0005]
Further, inside the steel sheet pile 61, a flat plate 66 is provided so that the groundwater flowing from the gap of the steel sheet pile can be collected in the drainage groove 62 without flowing into the underground slab or the underground wall.
[0006]
The rough construction procedure of the underground slab 60, which is the base of the underground structure, is provided with a pothole 65 and a guide water channel 64 that connects the pothole and the drainage ditch 62 everywhere on the bottom ground 67, and a drainage hose above the pothole. A mold 68 for providing a passage is provided. Although not shown in the figure, a waterproof sheet is laid on the bottom ground 67, and a crushed stone layer 69 is laid thereon, and a discarded concrete layer 70 is formed thereon. A pressure-resistant concrete layer 71 having properties is formed.
[0007]
When the underground slab 60 is completed, the underground wall 72 is then provided, and finally the formwork 68 is removed, and the pothole 65 and the cavity formed thereon are filled, and the pressure-resistant concrete layer 71 is supplemented with ready-mixed concrete. Finally, a mortar layer 73 is formed on the surface.
[0008]
In addition, during the above construction, since groundwater constantly flows into the kettle place 65, the drainage operation must be continued until the filling of the water-stopping material such as mortar into the cavity formed on the kettle place. Therefore, the drainage pump 63 must be operated even while the waterstop material is being filled, and therefore the drainage pump cannot be removed, so this pump is eventually buried.
[0009]
[Problems to be solved by the invention]
In the above-mentioned conventional example, since the kettle place 65 is always in communication with the guide water channel 64, the groundwater flows back from the kettle place 65 to the upper surface of the underground slab 60 after the pressure resistant concrete layer 71 of the underground slab is formed. There is a risk of overflow. Accordingly, the drainage pump 63 must be operated even after the mold 68 is removed.
[0010]
For this reason, since the pump cannot be stopped until the water-stopping material such as mortar is filled in the cavity after removing the mold, as described above, the expensive pump is eventually buried. If an inexpensive pump with low performance is used to reduce the economic loss due to the burying of the pump, the drainage during construction will be insufficient and the quality of the concrete will be deteriorated. There is also a limit.
[0011]
Further, if the formwork 68 provided above the kettle place 65 is insufficiently waterproofed at the boundary with the underground slab 60, the discarded concrete layer 70 and the pressure resistant concrete layer 71 in which the groundwater flowing backward from the kettle place is being cast. There is a risk of entering into inflated concrete with inferior strength.
[0012]
Furthermore, in the prior art, if the waterproofing property of the water stop material to be filled in the cavity after removing the cavity portion of the pothole 65 and the formwork 68 is not perfect, the groundwater is transferred to the upper surface of the underground slab. There is also a problem of rising.
[0013]
Accordingly, an object of the present invention is to prevent deterioration of the quality of concrete by first preventing the ingress of groundwater into the concrete being placed during construction of the underground slab. Secondly, it enables recovery of expensive drainage submersible pumps. The third is to completely prevent groundwater from flowing from the kamaba to the upper surface of the underground slab after completion of the construction of the underground structure.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following means.
It is possible to construct an underground structure under complete drainage conditions using a drainage box equipped with the following elements in the stove at the construction site of the underground structure. Here, the drainage box is a box that promotes drainage of groundwater by embedding in the kettle place instead of the drainage basin provided in the kettle place in the prior art, and has the following elements. .
[0015]
That is, the drainage box is formed on the body part where the submersible pump for drainage can be installed, and on the upper part of the body part. A cylinder part that can be provided with a frame, an upper opening provided in the cylinder part so that the submersible pump for drainage can be taken in and out, and a guide water channel provided at a construction site of an underground structure for guiding ground water to a kettle. A plurality of water inlets provided around the trunk portion so as to be connectable, and a water stop cock capable of opening and closing these water inlets from the inside. In addition, this drainage box is manufactured in advance in a factory, and this is carried into a construction site and installed.
[0016]
By adopting the above-mentioned drainage box, it is easy to set up the stove place provided at the construction site of the underground structure, and it is possible to completely prevent leakage of the ground water after the stove place is backfilled. In addition, the construction cost can be reduced by making it possible to collect the submersible pump for drainage.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. First, the drainage box will be described with reference to FIGS.
[0018]
The drainage box 1 is composed of a rectangular parallelepiped container-like body portion 2 and a rectangular parallelepiped tube portion 3 provided on the upper portion of the body portion with a cross-sectional area smaller than that of the body portion. Both the body part 2 and the cylinder part 3 are made of a so-called sheet metal product assembled by joining steel plates by welding, and the upper part (ceiling surface) of the body part 2 inside the cylinder part 3 is notched to form an upper opening 4. . The body portion 2 is sized to accommodate the submersible pump 5, and the upper opening 4 is sized to allow the pump to be taken in and out.
[0019]
In addition, circular water inlets 6 are provided at the upper part of each side of the body part 2 (only two places are shown). The water inlet 6 is an inlet hole for introducing groundwater into the drainage box 1 from a later-described guide channel, and is surrounded by a base portion of a cylindrical sleeve 7 in the trunk portion. The sleeve 7 has a base portion of a steel pipe fixed to the inside of the body portion 2 by welding, and a male screw portion 7a is carved at the tip portion.
[0020]
The tip of the sleeve 7 is covered with a water stop cock 8 so that the ingress of groundwater from the water inlet 6 can be stopped. The water stopcock 8 is made of a steel cap nut, and the female threaded portion 8a carved on the opening side can be screwed with the male threaded portion 7a of the sleeve. The number of the water inlets 6 is determined according to the actual situation at the construction site. Unnecessary installation of water inlets will increase costs and cause water leakage, so the number of water inlets corresponding to the actual situation should be determined.
[0021]
Next, with reference to FIGS. 3 and 4, the construction method of the underground structure adopting the drainage box 1 will be described by taking the construction site of the basement as an example.
[0022]
FIG. 3 shows a process state of construction of the basement using the drainage box 1. In this figure, the construction of the underground slab 11 located on the lowermost floor of the basement has been completed, but in the following explanation, the groundwater is used for the processes from the ground excavation to the completion of the underground slab 11 and the underground wall 25. This will be explained in sequence, with the drainage of
[0023]
First, the steel sheet pile 12 is driven around the construction site of the underground structure as in the prior art, and the inside is excavated. Next, a drainage groove 13 for groundwater is provided along the inside of the steel sheet pile on the bottom ground, and further, recesses that serve as the guiding water channel 14 and the kettle 15 are provided.
[0024]
Further, on the inner side of the steel sheet pile 12, a blister plate 16 is provided to collect water leaked from the underground excavation surface downward along the steel sheet pile surface. The bottom plate 16 is provided so that the lower part is positioned between the steel sheet pile 12 and the drainage groove 13 and the upper part is at a height substantially coincident with the upper surface of a later-described pressure-resistant concrete layer 24.
[0025]
The drainage box 1 is embedded in the recess that becomes the pothole 15 so that the water inlet 6 can be connected to the guide water channel 14. In addition, in the drainage channel 13 and the guide channel 14, entrances for groundwater are provided everywhere, so that underground groundwater can be collected and introduced into the drainage box 1.
[0026]
Next, a water stop member 17 made of a bentonite sheet is affixed around the cylindrical portion 3 of the drainage box 1, and a mold 18 is provided so as to surround the periphery (first step). The presence of the water stop member 17 serves to prevent water leakage from between the outer peripheral portion of the cylindrical portion 3 and the mold 18. The mold 18 allows the drainage submersible pump 5 to be taken in and out and also serves to pass the drainage hose 9. The formwork 18 may be installed after the below-mentioned cracked stone layer 19 is laid. The water stop member 17 functions to prevent water leakage from between the drain box 1 and the mold 18. The upper end of the mold 18 is installed so as to be located above the upper surface of the pressure resistant concrete layer 24.
[0027]
Next, the submersible pump 5 is installed in the drainage box 1, the stop cock 8 is removed, the water inlet 6 is opened, and groundwater is collected in this drainage box. The collected groundwater can be drained to the ground via the drain hose 9 (second step). The submersible pump 5 is provided so as to be able to suck groundwater through a strainer 5b placed on the base 5a.
[0028]
Next, a waterproof sheet (not shown) is laid on the bottom ground including the guide water channel 14, and a cracked stone layer 19 is formed by laying medium-sized cobbles on the waterproof sheet. The upper surface of the cracked stone layer 19 has a height that substantially coincides with the upper end of the trunk portion 2 of the drainage box 1.
[0029]
Next, bentonite powder is applied in a substantially triangular cross section around the mold 18 to connect the upper surface of the body portion 2 of the drainage box 1 and the intermediate position of the cylindrical portion 3, and the water stopping portion 20. Form. The water stop 20 may be formed of mortar or the like. Thus, it becomes possible to prevent the leakage of groundwater from the periphery of the mold 18 by forming the water stop portion 20 around the cylindrical portion 3 of the drainage box 1 during construction.
[0030]
Next, a waterproof sheet is laid on the upper surface of the cracked stone layer 19, and a discarded concrete layer 21 is formed thereon to a height (about 160 mm) substantially coincident with the upper end portion of the drainage box 1. When the discarded concrete layer 21 is solidified, a waterproof plate 22 formed in an L-shaped cross section is arranged along the inner side of the flat plate 16, and a waterproof sheet 23 is further arranged inside the waterproof plate 22. The waterproof sheet 23 is provided so as to overlap with the water stop plate 22 in a range where the water stop plate 22 is provided, and to be parallel to the steel sheet pile 12 in the range above the blister plate 16.
[0031]
Thus, when the upper part of the discarded concrete layer 21 is covered with the waterproof sheet 23, the pressure-resistant concrete layer 24 is placed thereon. The pressure-resistant concrete layer 24 has a thickness of approximately 300 mm and is placed on the entire underground floor except for the portion of the mold 18 (third step).
[0032]
Here, the underground wall 25 is constructed on the underground slab 11 along the steel sheet pile 12. The underground wall 25 is performed in such a state that the waterproof sheet 23 is interposed inside the steel sheet pile 12 so that the underground water does not flow into the concrete being placed.
[0033]
Next, with the submersible pump 5 draining, put a hand into the drainage box 1 from the upper surface side of the underground slab 11, cover all the sleeves 7 with caps (stopcocks) 8 and close the water inlets 6. Then, the entry of groundwater from the guide channel 14 is stopped. Shortly thereafter, all the groundwater remaining in the drainage box 1 is drained by the submersible pump 5. Next, the submersible pump 5, strainer 5b and hose 9 are pulled up and collected, and the mold 18 is removed (fourth step).
[0034]
Next, as shown in FIG. 4, the drainage box 1 that has been emptied is filled with a backfill material 26 such as earth and sand or debris to be tamped. The filling amount of the backfill material 26 is set to the vicinity of the upper end portion of the cylindrical portion 2. For this reason, even if the backfill material 26 is filled after the pump is recovered, the water level does not rise from below, so that the backfilling operation of the kettle can be carried out with a margin. Next, a water-stopping material 27 made of bentonite powder is put into a cavity formed inside the cylinder portion 3, and surrounds and surrounds the cylinder portion 3 to perform a water leakage prevention process from the drainage box 1. (5th process). Thus, if the water stop material 27, such as a bentonite, is arrange | positioned around the opening part 4 after the formwork 18 removal, it will become possible to prevent the raise of the groundwater from the inside and outside of a kamaba box completely.
[0035]
Next, the filled concrete portion 28 is provided by filling and solidifying the empty cavity portion left above the submersible pump. In addition, in order to form the surface mortar layer 29 in each upper surface of the pressure-resistant concrete layer 24 and the filling concrete part 28, the surface boundary with the filling concrete part 28 with which the cavity part left above the drainage box 1 was filled is It does not appear on the surface of the underground slab 11.
[0036]
The construction method described above is merely an example, and there are many actual construction examples. First, the present invention facilitates the installation of the drainage structure by installing the drainage box 1 on the kettle 15. Secondly, it is possible to stop the inflow of groundwater into the drainage box by closing the stop cock 8 after removing the formwork. Third, the submersible pump can be recovered after the formwork is removed. Fourth, it is possible to prevent groundwater from leaking from the gap of the pressure-resistant concrete layer by placing bentonite around the opening 4 of the cylindrical portion after filling the backfill material into the pot box 1 after collecting the submersible pump. It has the characteristics.
[0037]
In this example, the shape of the drainage box 1 is a rectangular parallelepiped. However, the shape is not limited to this, and the material can be made of a synthetic resin or other material in addition to a steel plate. Further, although the water stopcock 8 is described as a cap-like one, it may be formed into a rod shape, and a screw may be engraved on the water stopcock and a female screw may be engraved on the opening side of the sleeve 7.
[0038]
In addition, even if the order of the steps of installing the mold 18 and forming the cracked stone layer 19 and the discarded concrete layer 21 is reversed from the above description, the effect of the present invention is not affected.
[0039]
【The invention's effect】
If the drainage box in this invention is employ | adopted, the installation of the kettle place in the construction site of an underground structure will become easy, and also the construction without the leakage of groundwater will be attained. Moreover, since the water inlet of the drainage box is openable and closable, the water in the drainage box can be excluded by closing it at a predetermined construction point. Therefore, the submersible pump can be recovered after closing the water inlet.
[0040]
In addition, if the construction of the underground structure is adopted by adopting the present invention, the waterproofing measures are perfect, so that the phenomenon of padding in the concrete at the time of placing the concrete disappears, so that an underground structure made of high-quality concrete can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration example of a drainage box.
FIG. 2 is a perspective view showing an example of the appearance of a drainage box.
FIG. 3 is a cross-sectional view showing a construction example of an underground structure employing a drainage box.
FIG. 4 is a cross-sectional view showing a state after completion of construction.
5A and 5B show a conventional example, in which FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drainage box 2 trunk | drum 3 cylinder part 4 upper opening 5 submersible pump 6 water inlet 8 stop cock 11 underground slab 12 steel sheet pile 13 drainage ditch 14 guide waterway 15 pothole 18 formwork 20 water stop part 26 backfill material 27 stop Water material (bentonite)

Claims (1)

A trunk that can accommodate a submersible pump;
It is formed in the upper part of the body part, a water stop member can be attached to the periphery, and a cylinder part that can be provided with a mold so as to surround the water stop member;
An upper opening provided so that the submersible pump can be taken in and out of the cylindrical portion;
A plurality of water inlets provided around the trunk,
A drainage box for a stoveyard, characterized by having a stop cock that allows these water inlets to be opened and closed from the inside.

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