KR101961284B1 - System for flow-back underground water occurred by the De-Watering - Google Patents

Abstract

The present invention relates to a groundwater reduction system using a permanent drainage method that can return groundwater discharged from an underground to an earth surface when a building is constructed using the permanent drainage method of a building,
That is, according to the present invention, groundwater discharged from a basement layer is not discharged to the outside when the foundation layer of a building or the like is installed using a permanent drainage method, and the groundwater can be reduced back to the basement layer, In order to prevent the groundwater resources from consuming and sinking due to the fact that buoyancy of groundwater does not act on the foundation layer of the building, safe building construction can be done and the groundwater is reduced back to the original ground layer And to provide a groundwater reduction system by a permanent drainage method of a building.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a groundwater re-

The present invention relates to a groundwater reduction system using a building permanent drainage method, and more particularly, to a groundwater reduction system using a building permanent drainage method, in which a groundwater discharged from an underground to a ground surface is reduced The present invention relates to a groundwater reduction system using a permanent drainage method.

De-watering is generally used when there is a large amount of groundwater depending on the type of ground and stratum.

The permanent drainage method is a method for reducing the buoyancy (positive pressure) of the groundwater acting on the bottom surface of the foundation layer (concrete layer) for the building of a building. The drainage layer for inducing the groundwater flow is formed at the bottom of the foundation layer, Collecting the underground water acting on the bottom of the foundation layer through the drainage layer and collecting it by forced collection, discharging it to the outside after discharging it on the ground by forcibly pumping.

When the foundation layer of the building is constructed using the permanent drainage method, it is possible to construct a stable foundation layer and building building by removing the buoyancy of the groundwater to the foundation layer. However, when the groundwater is pumped onto the ground surface, Drainage facilities and rivers, etc.), it is inefficient to consume groundwater resources, and in the case of aquifers, the amount of groundwater consumed by pumping is larger than the amount of groundwater flowing in the case of some permeable strata. There is a problem that ground settlement phenomenon is expected due to the space where the existing ground water is absent.

In other words, if a large amount of groundwater existing in the basement layer is removed, the ground becomes empty in the removed place, and the load supported by the groundwater is concentrated in the empty space, Car damage will follow.

Thus, it is required not only to securely construct the foundation layer and the ground layer of the building by the permanent drainage method but also to reduce the groundwater back to the basement layer within a range that does not adversely affect the base layer of the building have.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a groundwater drainage system, By making it possible to reduce the groundwater into the basement layer, it is possible to construct a safe building due to the absence of the buoyancy of the groundwater in the foundation layer of the building. In addition, as the groundwater is reduced back to the basement layer, And to provide a groundwater reduction system using a building permanent drainage method.

According to an aspect of the present invention, there is provided a vertical drain pipe extending from an underground water collector disposed around a foundation layer of a building to an upper end of a building wall of the building; A horizontal drain pipe communicably connected to the vertical drain pipe and installed along an outer circumference of the wall; A groundwater storage block connected to the horizontal drain pipe so as to be installed in the ground of the outer side of the construction wall; And a groundwater reduction pipe communicably connected to the bottom of the groundwater storage block, the groundwater reduction pipe being press-fitted into the ground of the outer wall of the building, The present invention provides a groundwater reduction system using the permanent water drainage method.

Particularly, the groundwater storage block includes a first storage chamber communicating with the horizontal drain pipe, and a second storage chamber formed adjacent to the first storage chamber and a partition wall formed with an overflow hole, And the groundwater reducing pipe is connected to the bottom of the second storage room so as to be able to communicate with each other.

In addition, the horizontal drain pipe connected to the first storage chamber is equipped with a check valve for preventing the ground water from flowing back to the vertical drain pipe.

In addition, a cement grouting unit is installed in the upper circumference of the groundwater reduction pipe connected to the second storage room for fixing the groundwater reduction pipe.

The first storage chamber and the second storage chamber are formed with a manhole cover seat on which a manhole cover is seated.

According to another aspect of the present invention, there is provided a vertical drain pipe extending from an underground water collector disposed around a foundation layer of a building to an upper end of a building wall of the building; A horizontal drain pipe communicably connected to the vertical drain pipe and extending toward the earth retaining wall outside the wall; A drain socket communicably connected to the horizontal drain pipe and disposed at an upper end of the inner surface of the earth retaining wall; A drainage board connected to a lower portion of the drain socket and closely connected to the entire inner surface of the earth retaining wall; And a groundwater storage block connected to a connection pipe extending outwardly from the drain socket and constructed within the outer region of the earth retaining wall; The present invention provides a groundwater reduction system using the permanent water drainage method.

Preferably, the surface of the drain board is covered with geosynthetics to protect the drain board from gravel backed between the wall of the building and the earth retaining wall.

In addition, the horizontal drain pipe is equipped with a check valve for preventing the groundwater from flowing back to the vertical drain pipe.

In addition, the groundwater storage block is provided with a single storage room structure in which a connection pipe is connected to one side lower part, a discharge pipe is connected to the other side, and a manhole cover seat for receiving a manhole cover is formed on the upper part.

The groundwater storage block may include a first storage chamber having a connection pipe connected to a lower portion of one side thereof, and a second storage chamber formed adjacent to the first storage chamber and a partition wall having an overflow hole formed therebetween, And a manhole cover seat for receiving a manhole cover is formed at an upper portion of the first storage chamber and the second storage chamber.

The present invention provides the following effects through the above-mentioned problem solving means.

First, when the base layer of the building is constructed using permanent drainage method, groundwater discharged from the basement layer can be returned to the original ground layer without discharging the groundwater to the outside uselessly, and the groundwater is uselessly wasted Can be prevented.

Second, since the buoyancy of groundwater does not act on the foundation layer of the building, it is possible to construct a safe building and to reduce the groundwater back to the basement layer, thereby preventing groundwater resources from consuming and sinking can do.

1 and 2 are a sectional view and a plan view showing a groundwater reduction system according to an embodiment of the present invention,
3 is a cross-sectional view of an essential part of a groundwater reduction system according to an embodiment of the present invention,
FIG. 4 is a plan view showing a groundwater storage block of a groundwater reduction system according to an embodiment of the present invention,
5 and 6 are a sectional view and a plan view showing a groundwater reduction system according to another embodiment of the present invention,
FIG. 7 is an enlarged sectional view of a groundwater reducing system according to another embodiment of the present invention,
FIG. 8 and FIG. 9 are sectional views showing a groundwater storage block of a groundwater reduction system according to another embodiment of the present invention,
10 is a perspective view showing a drain socket communicably connected to a drain board of a groundwater reduction system according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As described above, when the foundation layer of the building is installed, a large amount of groundwater discharged from the foundation layer may adversely affect the built-up state of the foundation layer because buoyancy acts on the foundation layer.

In consideration of this, when the foundation layer of the building is constructed using the above-mentioned permanent drainage method, the groundwater is forcibly collected in a predetermined sediment correction, and then the groundwater collected is pumped over the surface of the ground, The groundwater resources are inefficiently consumed, and in the case of the dry season, in some stratified conditions, the amount of groundwater consumed by pumping is larger than the amount of groundwater flowing in the groundwater. And the ground settlement phenomenon is expected to occur.

The present invention relates to a method for recovering groundwater from a groundwater layer, wherein groundwater discharged from the groundwater layer is collected by collecting the collected groundwater, The buoyancy of the groundwater does not act on the foundation layer of the building, so that safe building construction can be performed. In addition, as the groundwater is returned to the basement layer, consumption of groundwater resources and subsidence The point is that there is one point to avoid.

Hereinafter, the construction and operation of the groundwater reduction system according to the embodiment of the present invention will be described.

1 to 4 are views showing a groundwater reduction system according to an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a foundation layer of a building.

The foundation layer 10 of the building is a concrete layer that is constructed by the permanent drainage method and forms a foundation of the building. A groundwater collector 12 for collecting groundwater by the permanent drainage method is formed at a predetermined position.

After the foundation layer 10 of the building is constructed, a basement layer of the building is successively built, and on each side of the basement, there is a building wall 14 forming a wall of a basement layer. And is present in the entirety of the base layer 10 and the basement layer while limiting the inner surface.

As shown in FIGS. 1 and 2, a vertical drain pipe 20 (see FIG. 1) is provided for pulling groundwater from the groundwater collecting unit 12 disposed around the foundation layer 10 of the building to the upper end of the building wall 14 of the building And a horizontal drain pipe 22 communicating with the vertical drain pipe 20 is disposed at an outer circumferential position of the upper end of the wall 14.

At this time, a groundwater storage block 30 communicably connected to the horizontal drain pipe 22 is buried in the ground of the outer region of the construction wall body 14.

Particularly, a groundwater reduction pipe (24) is connected to the bottom of the groundwater storage block (30). The groundwater reduction pipe (24) is pushed into the ground in the area outside the building wall (14) Is pressed deeper than the foundation layer (10) of the building so that the groundwater can be more easily reduced to the original ground layer.

The groundwater storage block 30 is temporarily stored before the groundwater passing through the vertical drain pipe 20 and the horizontal drain pipe 22 is pumped from the collection tank and returned to the ground layer. As shown in FIG. 3, A first storage chamber 31 communicating with the pipe 22 and a second storage chamber 32 formed adjacent to the first storage chamber 31 and a partition wall 34 formed with an overflow hole 33 therebetween.

3, the upper end of the groundwater reducing pipe 24, which is press-in deeper than the foundation layer 10 of the building, is connected to the bottom of the second storage chamber 32 of the groundwater storage block 30, And an exhaust pipe 35 is connected to the upper end of the second storage room 32 of the groundwater storage block 30 to discharge a part of the groundwater to the upper end of the second storage room 32 when the amount of groundwater flowing into the second storage room 32 is too large.

At this time, a check valve 21 is installed in the horizontal drain pipe 22 connected to the first storage chamber 31 to prevent the groundwater from flowing back to the vertical drain pipe 20 and the collector 10 again.

The first and second storage rooms 31 and 32 are formed with a manhole cover seating opening 37 on which the manhole cover 36 is seated. The manhole cover 36 is seated in the manhole cover seating opening 37 so as to be openable as shown in FIG.

Meanwhile, the groundwater reduction pipe 24 connected to the second storage chamber 32 is inserted into the ground hole while being inserted into the perforation hole formed by the perforator, and the groundwater reduction pipe 24 is connected to the groundwater reduction pipe 24 3, a cement grouting portion 26 is provided in the upper circumferential portion of the groundwater reducing pipe 24 for fixing the groundwater reducing pipe 24, Construction.

Accordingly, when the foundation layer of the building is constructed by using the permanent drainage method, when the ground water coming from the ground layer is collected in the collection collector 10 through the predetermined collection water passage, the pump (not shown) When the groundwater is pulled up through the vertical drain pipe 20, the groundwater flows to the outside of the construction wall through the horizontal drain pipe 22 extending to the outside of the construction wall 14.

The groundwater passing through the horizontal drain pipe 22 is temporarily stored in the first storage chamber 31 of the groundwater storage block 30. When the groundwater storage amount gradually increases, Through the overflow hole 33 of the second storage chamber 32.

The groundwater introduced into the second storage chamber 32 drops to the bottom of the second storage chamber 32 and enters the groundwater reduction pipe 24. The groundwater introduced into the groundwater reduction pipe 24 is discharged to the groundwater reduction pipe 24 And then is reduced to the inside of the foundation layer 10 outside the building, that is, the ground layer 14 outside the building wall 14 separated from the inside of the building by the building wall 14.

Meanwhile, when too much groundwater is instantaneously stored in the second storage room 32 of the groundwater storage block 30, some groundwater is discharged to the outside through the discharge pipe 35 formed at the upper end of the second storage room 32 do.

As described above, according to one embodiment of the present invention, groundwater discharged from a basement layer is collected in a collecting tank and discharged to the outside without being useless when a base layer of a building or the like is constructed by using a permanent drainage method. The groundwater can be restored to the original ground layer through which the groundwater is present, so that the buoyant force of the groundwater does not act on the foundation layer of the building. Thus, safe building construction can be accomplished, It is possible to prevent the consumption of resources and settlement phenomenon from occurring.

Hereinafter, the construction and operation of the groundwater reduction system according to another embodiment of the present invention will be described.

5 to 10 show a groundwater reduction system according to another embodiment of the present invention.

Another embodiment of the present invention is a path for reducing groundwater using a retained wall 16 to be applied when a building foundation layer is constructed, a drain socket 38 for reducing groundwater in the retained wall 16, And a drain board 40 is provided.

The retaining wall 16 is a reinforcement structure installed at the outermost part of the building construction area when a trenching process is performed to construct the building. The retaining wall 16 maintains a certain distance from the construction wall 14, So that the earth retaining wall 16 can be used as a medium for groundwater reduction in another embodiment of the present invention.

In other words, in the embodiment of the present invention, the groundwater reducing pipe is pierced through the perforation hole to the ground layer. However, in another embodiment of the present invention, And to use it as a medium for communication.

As shown in FIG. 5, in another embodiment of the present invention, from the groundwater collecting unit 12 disposed around the base layer 10 of the building to the upper end of the building wall 14 of the building, 5 and 6 and connected to the vertical drain pipe 20 so as to be connected to the earth retaining wall 16 outside the wall 14 as shown in FIGS. And a horizontal drain pipe 22 extending therefrom.

6 and 7, a hollow drain socket 38 is disposed at the upper end of the inner surface of the earth retaining wall 16 so as to communicate with the horizontal drain pipe 22, and the earth retaining wall The lower end of the drainage socket 38 and the drainage board 40 for reducing the groundwater can be connected to each other and can be connected to each other.

7, a plurality of drain guide protrusions 41 protrude from the outer surface of the drain board 40. The drain guide protrusions 41 are in close contact with the earth retaining wall 16, The path between the projections 41 becomes a path for reducing the groundwater.

10, the drain socket 38 includes a hollow tube 38-1 connected to the horizontal drain tube 22 in a communicative manner and a drain tube 38 formed integrally with the lower tube 38-1, And a hollow fastening block 38-2 fastened to the frame 40.

7, a drain socket 38 communicably connected to the horizontal drain pipe 22 is disposed at an upper end portion of the inner surface of the earth retaining wall 16, and a drain socket 38 is provided at a lower portion of the earth retaining wall 16 The ground wall reducing drainage board 40 is fastened with the fastening block 38-2 of the drainage socket 38 and tightly installed on the entire inner surface of the drainage socket 38. The drainage board 40 and the drainage board 40, And the soil is filled in the space between them.

At this time, when the soil is sandwiched between the wall 14 of the building and the earth retaining wall 16, the drain board may be damaged by the soil, so that the drain board 40 is protected from the earth Absorbent geosynthetic fibers 42 are wrapped around the surface of the drain board 40. [

Accordingly, when the foundation layer of the building is constructed by using the permanent drainage method, when the ground water coming from the ground layer is collected in the collection collector 10 through the predetermined collection water passage, the pump (not shown) When the groundwater is pulled up through the vertical drain pipe 20, the groundwater flows to the outside of the construction wall through the horizontal drain pipe 22 extending to the outside of the construction wall 14.

The groundwater that has passed through the horizontal drain pipe 22 flows to the drain board 40 through the drain socket 38 and the groundwater passes through the drain guide protrusions 41 of the drain board 40, .

At this time, if a large amount of ground water is simultaneously poured toward the drain socket 38 and the drain board 40, all the ground water may not be reduced along the drain board 40, The groundwater can be stored in the groundwater storage block 30.

8 and 9, the groundwater storage block 30 is connected to the connection pipe 39 extending outwardly from the drain socket 38, and is connected to the drainage wall 38 of the earth drainage wall 16, Construction.

As shown in FIG. 8, the groundwater storage block 30 may have a single storage structure in which a connection pipe 39 is connected to one side of the groundwater storage block 30 and a discharge pipe 35 is connected to the other side of the groundwater storage block 30, 30, a manhole cover seating opening 37 for receiving a manhole cover 36 for removing foreign matter accumulated in the storage block is formed.

When a large amount of ground water is poured into the drain sockets 38 and the drain board 40 at a time, a predetermined amount of the ground water is reduced to the ground layer through the drain board, and groundwater of a predetermined amount or more passes through the connection pipe 39, (30).

At this time, when the amount of ground water flowing into the drain socket 38 becomes less than a predetermined amount, the groundwater stored in the groundwater storage block 30 flows back to the connection pipe 39 by the water head pressure, Through the board (40).

9, the groundwater storage block 30 includes a first storage chamber 31 to which a connection pipe 39 is connected to one side of the groundwater storage block 30, and a first storage chamber 31 having a first storage chamber 31 and an overflow hole 33, And a second storage compartment 32 formed adjacent to the first storage compartment 34 with a gap therebetween.

An exhaust pipe 35 is connected to a lower portion of the other side of the second storage chamber 32 and an upper portion of the first storage chamber 31 and the second storage chamber 32 And a manhole cover seating port 37 on which the manhole cover 36 is seated is formed.

When a large amount of ground water is poured into the drain sockets 38 and the drain board 40 at a time, a certain amount of the ground water is reduced to the ground layer through the drain board, and the remaining ground water is passed through the connection pipe 39, Is temporarily stored in the first storage chamber 31 of the block 30. When the groundwater storage amount gradually increases, the water flows from the first storage chamber 31 through the overflow hole 33 of the partition 33 to the second storage chamber 32 I will enter.

Thereafter, when the amount of ground water flowing into the drain socket 38 becomes less than a predetermined amount, the groundwater stored in the first storage chamber 31 of the groundwater storage block 30 flows back toward the connection pipe 39 by the water head pressure Through the drain sockets 38 and the drain board 40 to the ground layer.

As described above, according to another embodiment of the present invention, groundwater discharged from a basement layer is collected in a house collector when a base layer of a building or the like is constructed by using a permanent drainage method or the like, In addition, since the buoyant force of the groundwater does not act on the foundation layer of the building, it is possible to construct a safe building and to return the groundwater back to the basement layer, It is possible to prevent the consumption of resources and the settlement of the ground.

Meanwhile, the groundwater reducing pipe 24 may be coated with an anti-fouling coating layer made of a composition for preventing fouling, so as to effectively prevent and remove the adhesion of the pollutants.

The composition for anti-fouling coating contains alkaline polyglucoside and aminoalkyllaurobetain in a molar ratio of 1: 0.01 to 1: 2, and the total content of the alkylate polyglucoside and aminoalkyllaurobetain is 1 to 10 Weight%.

The molar ratio of the alkylate polyglucoside and the aminoalkyl sucrose is preferably in the range of 1: 0.01 to 1: 2. If the molar ratio is out of the above range, the coating property of the substrate may be lowered or the adsorption of water on the surface may increase, .

The alkaline polyglycoside and the aminoalkylsulbate are preferably used in an amount of 1 to 10% by weight based on the total weight of the composition. When the content is less than 1% by weight, the applicability of the base material is deteriorated. When the content is more than 10% by weight, The crystal precipitation is likely to occur.

On the other hand, as a method of applying the present anti-fouling coating composition onto a substrate, it is preferable to coat it by a spray method. The thickness of the final coated film on the substrate is preferably 500 to 2000 angstroms, more preferably 1000 to 2000 angstroms. If the thickness of the coating film is less than 500 angstroms, there is a problem of deterioration in the case of a high-temperature heat treatment. On the other hand, when the thickness of the coating film is more than 2000 angstroms,

The anti-contamination coating composition may also be prepared by adding 0.1 mol of an alkylate polyglucoside and 0.05 mol of aminoalkylsorbate to 1000 mL of distilled water and stirring.

In addition, the vertical drain pipe 20 and the horizontal drain pipe 22 may be coated with a fragrance material mixed with a functional oil, thereby sterilizing the vertical drain pipe 20 and the horizontal drain pipe 22, The effect of relieving the stress of the user.

The functional oil may be mixed with 95 to 97% by weight of the perfume material and 3 to 5% by weight of the functional oil, and the functional oil may be selected from the group consisting of Acacia dealbata oil 50 By weight, and 50% by weight of Valeriana fauriei oil.

It is preferable that the functional oil is mixed in an amount of 3 to 5% by weight based on the perfume material. If the mixing ratio of the functional oil is less than 3% by weight, the effect is insignificant. If the mixing ratio of the functional oil exceeds 3 to 5% by weight, the function is not greatly improved, but the manufacturing cost is greatly increased.

The main chemical composition of Acacia dealbata oil is palmic aldehyde and enanthic acid. It has a good fragrance and has a good effect on sterilization, anti-aging and stress relief.

Valeriana fauriei oil is the main chemical component of bornyl acetate, pinene, and blood pressure lowering effect, as well as calming and calming the action of the anxiety, relaxation effect is excellent.

This functional oil is coated on the vertical drain pipe 20 and the horizontal drain pipe 22 to sterilize the vertical drain pipe 20 and the horizontal drain pipe 22, .

A rubber material packing (not shown) may be provided between the parts of the check valve 21 to maintain watertightness. The packing material may contain 60 wt% of rubber, 33 to 36 wt% of carbon black, 2 to 5% by weight of an antioxidant, and 1 to 3% by weight of sulfur as an accelerator.

When the content is less than 33% by weight, the elasticity and abrasion resistance are reduced. When the content is more than 36% by weight, the rubber content of the main component is relatively small and the elasticity may be lowered. , And 33 to 36% by weight.

The antioxidant is selected from 3C (N-PHENYL-N'-ISOPROPYL-P-PHENYLENEDIAMINE) or RD (POLYMERIZED 2,2,4-TRIMETHYL-1,2-DIHYDROQUINOLINE) If the content is less than 5% by weight, the content of the rubber as a main component may be relatively small and the elasticity may be lowered. Further, since the cost of the antioxidant is high, To 5% by weight is appropriate.

Sulfur, which is an accelerator, is mixed in an amount of 1 to 3% by weight. When less than 1% by weight, the effect of vulcanization is insignificant in the heating process during molding, so 1% by weight or more is added. If the content is more than 3% by weight, the content of the rubber as the main component may be relatively small and the elasticity may be lowered. Therefore, 1 to 3% by weight is appropriate.

Accordingly, since the present invention is reinforced with a synthetic rubber having elasticity in various directions, the elasticity, toughness and rigidity of the packing are increased, so that the durability is improved and the service life of the packing is increased.

The geosynthetic fibers 42 may be formed of a nonwoven fabric having a tensile strength of 8.5 kgf / cm 2, an elongation percentage of 30 to 50%, and a weight of 200 g.

The reasons for limiting the tensile strength, the elongation percentage and the weight of the geosynthetic fiber 42 in this way are that the inventor of the present invention obtained optimum effects within the numerical limit range as a result of many tests.

10: foundation layer of building
12: Correction of groundwater house
14:
16: Retaining walls
20: Vertical drain pipe
21: Check valve
22: Horizontal drain pipe
24: Groundwater reduction pipe
26: Cement grouting part
30: groundwater storage block
31: 1st storage room
32: Second storage room
33: Overflow hole
34:
35: Exhaust pipe
36: Manhole cover
37: Manhole cover seat
38: Drain socket
38-1: hollow tube
38-2: fastening block
39: Connector
40: drain board
41: Drain guide projection
42: Geo fiber

Claims (4)

delete delete A vertical drain pipe 20 extending from the groundwater collecting fixture 12 disposed around the foundation layer 10 of the building to the upper end of the building wall 14 of the building;
A horizontal drain pipe 22 communicably connected to the vertical drain pipe 20 and extending toward the earth retaining wall 16 outside the wall 14;
A hollow drain socket (38) communicably connected to the horizontal drain pipe (22) and disposed at the upper end of the inner surface of the earth retaining wall (16);
A drainage drainage board 40 connected to a lower portion of the drainage socket 38 so as to be closely contacted with the entire inner surface of the earth retaining wall 16; And
And a groundwater storage block (30) connected to a connection pipe (39) extending outwardly from the drain socket (38) and constructed in the outer area of the earth of the earth retaining wall (16);
Geo fiber 42 is wrapped around the surface of the drain board 40 to protect the drain board 40 from gravel backed between the wall 14 of the building and the earth retaining wall 16;
The horizontal drain pipe (22) is equipped with a check valve (21) for preventing ground water from flowing backward to the vertical drain pipe (20);
The groundwater storage block 30 has a connecting pipe 39 connected to one side of the groundwater storage block 30, a discharge pipe 35 connected to the other side of the groundwater storage block 30, and a manhole cover seat 37 on which a manhole cover 36 is mounted. A single storage room structure formed;
The groundwater storage block 30 includes a first storage chamber 31 to which a connection pipe 39 is connected at one side and a partition wall 34 having an overflow hole 33 and a first storage chamber 31 therebetween And an exhaust pipe 35 is connected to a lower portion of the other side of the second storage chamber 32. An upper portion of the first storage chamber 31 and the second storage chamber 32 are connected to a manhole A manhole cover seating port 37 on which the lid 36 is seated is formed;
A plurality of drain guide protrusions 41 protrude from the outer surface of the drain board 40 and the drain guide protrusions 41 are brought into close contact with the earth retaining wall 16 so that the path between the drain guide protrusions 41 is reduced ≪ / RTI >
The drain socket 38 includes a hollow pipe 38-1 connected to the horizontal drain pipe 22 and a hollow pipe 38-1 integrally formed at a lower portion of the hollow pipe 38-1, A fastening block 38-2;
A drainage socket 38 communicably connected to the horizontal drain pipe 22 is disposed at an upper end portion of the inner surface of the earth retaining wall 16 and a drainage drainage board (40) is fastened with the fastening block (38-2) of the drain socket (38), and the gaps between the wall (14) and the drain board (40) ;
The groundwater that has passed through the horizontal drain pipe 22 flows to the drain board 40 through the drain socket 38 so that the groundwater is returned to the ground layer while passing through the drain guide protrusions 41 of the drain board 40 Wherein the groundwater drainage system is installed in the groundwater drainage system. delete

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