KR100656413B1 - The construction method of basement drainage having double drainage canals and the system - Google Patents

Abstract

A method of constructing a ground water drainage for reducing upward water pressure of a construction and a system thereof are provided to ease the width of the discharge volume change due to the rise of the upward water pressure according to the height difference of the drain boards. In a construction method of forming a drainage for discharging the ground water through a sump pit(50), a method of constructing a ground water drainage for reducing upward water pressure of a construction comprises a first process of stopped to be on a level with an excavated finishing surface(20); a second process of installing drain boards(3,300) working as a drainage; a third process of forming a first discarding concrete layer by pouring a mortar up to a predetermined height; a fourth process of forming a second discarding concrete layer by pouring the mortar at the excavated finishing surface with a predetermined height; and a fifth process of placing the drain boards on the upper surface of the second discarding concrete layer.

Description

The construction method of basement drainage having double drainage canals and the system}

1 is a cross-sectional view showing a method for constructing a conventional basement floor drain.

Figure 2 is a cross-sectional view showing another construction method of the conventional basement floor drain.

3 is a cross-sectional view of the first embodiment constructed in accordance with the method of the present invention.

4 is a cross-sectional view of a second embodiment constructed in accordance with the method of the present invention.

5a to 5f are cross-sectional views illustrating the sequence of construction according to the method of the present invention.

6a to 6g are cross-sectional views showing the sequence of construction according to another method of the present invention.

7 is a sectional view of a third embodiment constructed in accordance with the method of the present invention.

8 is a sectional view of a fourth embodiment constructed in accordance with the method of the present invention.

9 is a perspective view of a connector applied to the method of the present invention.

10 is a cross-sectional view of the connector of FIG. 9.

FIG. 11 is a sectional view of a fifth embodiment constructed by applying the connector of FIG. 9. FIG.

12 is a cross-sectional view of the embodiment of FIG. 11.

FIG. 13A is a cross-sectional view of a sixth embodiment employing a second drainage material having “∩” shaped bends in accordance with the method of the present invention, and FIG. 13B is a cross-sectional view of an embodiment with a slight modification thereof.

FIG. 14 is a cross-sectional view of the seventh embodiment to which the connector of FIG. 9 and the second drainage material having the "curve" type bend are applied.

<Description of the symbols for the main parts of the drawings>

1: basement floor 3, 3a, 3b, 3c: (1) drainage

11: concrete wall 12: floor concrete

13: groundwater 20: gulto finish

30: gravel layer 40: drain pipe

41: through hole 50: water collecting well

60, 60 ': Geotextile (non-woven fabric) 70: Synthetic resin vinyl (film)

100: discarded concrete (floor) 110: upper case

120: lower case 140: opening

200: (bottom) concrete concrete (layer) 300: second drain

400: connecting member 1000: connector

The present invention relates to a groundwater drainage construction method and system thereof, and more particularly, to a construction method and a system of drainage material formed over two or more surfaces.

Among large buildings and underground structures, especially underground constructions that require deep excavation inevitably face the problem of uplift pressure of groundwater. Considering the geology and construction conditions of the site, it is very important to prepare a safe and economical upstream hydraulic pressure treatment plan.

In general, a process using dead weight and permanent (buoyancy) anchors is often used for the upward hydraulic pressure treatment on the foundation floor of a building, which does not guarantee the continuous reliability of the buoyancy anchor's tensile force in relation to the durability and safety of the building. There is a limit.

An improved method is to create an artificial catchment and drainage layer under the foundation floor, and when the groundwater flowing into the site is collected into the sump along the drainage, it is pumped and discharged regularly so that the uplifting water pressure acts on the foundation floor concrete. Permanent Underdrainage System. This has the advantage of more stable and permanently solve the problem of up-water pressure in proportion to the high groundwater level compared to the conventional method.

This permanent drainage system will be described in detail with reference to the accompanying drawings. Referring to FIG. 1, when the basement layer 1 is constructed in the basement floor drainage construction, the concrete wall 11 and the floor concrete 12 are poured to form a basement layer 1 having a predetermined area, and the floor concrete ( The lower side gravel layer 30 of 12) has a plurality of spaced apart at a predetermined interval so as to minimize cracks and water leakage when high upwater pressure caused by the water head difference of the oyster finish surface 20 is generated in the bottom concrete 12 A drain pipe in which the through hole 41 is formed is embedded.

In addition, one side of the bottom concrete 12 is constructed with a water collecting well 50 of a predetermined area lower than the bottom concrete, and the water collecting well 50 has an outlet side of the drain pipe 40 embedded in the gravel layer 30. It is constructed to be connected, and the groundwater collected in the sump 50 is configured to be pumped out by a pump (not shown). In addition, the nonwoven fabric 60 'is wound around the plurality of through holes 41 formed on the outer circumferential surface of the drain pipe 40 to prevent the gravel and sand of the gravel layer 30 from penetrating or blocking the through holes 41. have.

However, the conventional method is difficult to construct and the ground concrete 12 and the drain pipe (as well as the groundwater generated directly below the bottom concrete 12 by atmospheric pressure between the bottom concrete 12 and the drain pipe 40). There is a problem that the groundwater generated directly below the bottom concrete by the atmospheric pressure between the 40) is not properly drained through the through-hole 41 of the drain pipe 40, the overall drainage action is not smooth, There was a problem that the drainage of the groundwater is impossible because the drainage pipe is destroyed by the atmospheric pressure.

The basement floor drainage construction method was developed to improve the conventional problems and registered as Korean Patent No. 383665. The main contents of this construction method are shown in FIG. Referring to FIG. 2, the drainage material (or formwork) 3 having a predetermined height is horizontally and vertically connected to each other horizontally and vertically at a predetermined interval on the gulting finish surface 20, but the gulting finish surface 20 of the rock layer is disposed. ) And the outlet 31 of the drainage material 3 gathered to one side while placing the nonwoven fabric 60 between the drainage material 3 and the drainage material 3 is connected to the water collecting well 50, and the mortar is poured to a predetermined height on the bottom thereof. The concrete 12 is formed.

This improved configuration, since the drainage passage 4 is integrally formed on the bottom surface of the bottom concrete 12 in contact with the gulting finish surface 20 and excavation work to secure the gravel layer or gravel layer for constituting the drainage as in the prior art and There is no need for a separate drain pipe. Therefore, it is possible to shorten the construction period and reduce the material cost and construction cost, and the hydraulic pressure generated from the groundwater is guided along the drainage channel 4 formed integrally before acting as the bottom of the bottom concrete 12 to the sump well 50. There is an advantage of being missing.

In the patented technology, drainage (or formwork) installed horizontally or vertically on the gulting finish surface is connected to drainage directly connected to a collecting well on one plane to send groundwater to the drainage well. Due to various reasons such as shortening or splice construction of concrete and damage of drainage materials, some of the drainage materials are not directly connected to other drainage materials connected to the sump, and the discarded concrete is laid and the drainage installation process is incompletely finished. It has often been followed. It is also necessary to vary the installation height of the drain, or to intentionally vary the installation height of the drain for buffering against positive pressure.

Since there is no clear solution with the conventional patented technology, the need for a new construction method and system is increasing.

The present invention has been made to solve the above-described problems, an object of the present invention to provide a construction method in which the drainage on the gulto finish surface can be located at various heights and layers, improving the spatial constraints of the construction of drainage The purpose of the present invention is to provide a drainage system having a cushioning effect against upward hydraulic pressure, and to enable smooth drainage.

The construction method and configuration of the present invention for achieving the above object, the drainage for draining the groundwater to the sump formed on one side while preventing the high upward pressure caused by the water head difference of the groundwater generated in the bottom concrete floor of the underground building structure In the construction method for forming a, the upper surface itself after the excavation or the after-layer layer, gravel layer. One step of stopping the oyster finish surface horizontally by using a bag, etc., two steps of installing a drainage function as a drainage to allow groundwater to flow in and collect thereon, and a partial region in which the drainage material is installed; A third process of forming mortar at a predetermined height to cover the drainage material in a portion of the gulting finish surface to form a first discarded concrete layer; and in the third process, located in another region where the first discarded concrete layer is not formed After the drainage material is spaced apart from the gulting finish surface, pouring mortar at a predetermined height into the gulting finish surface of the other region to form a second discarded concrete layer; It characterized in that it comprises a five step of placing on the upper surface of the discarded concrete layer.

In addition, it characterized in that it further comprises the step of connecting the drainage material to the sump well to flow the groundwater in the drainage to the sump.

The method may further include forming a bottom concrete layer by pouring a predetermined mortar on the drainage material, the first cast concrete layer and the second cast concrete layer.

In addition, in the step 4, it is characterized in that the additional drain material is provided in the second cast concrete layer.

In addition, in the construction method of forming a drainage path for draining the groundwater to the sump well formed on one side while preventing the high up-water pressure caused by the water head difference of the ground concrete generated in the lower concrete floor of the underground building structure, the upper surface itself after the excavation or after the earth soil layer , 1 step of stopping the oyster finish surface horizontally by using a gravel layer, a block, etc., 2 process of installing a first drainage that functions as a drainage for the groundwater flows into the collected flow through the gulto finish surface, the drainage 4 to form the discarded concrete layer by pouring mortar to a predetermined height so as to cover the first drainage material in the region where the pit is finished and the gulting finish surface, and after the step 3, to install a second drainage material on the upper side of the discarded concrete layer. And five steps of connecting the first drain and the second drain to communicate with each other. And the work being configured.

In addition, it characterized in that it further comprises a step of connecting the first drain or the second drain to the sump and the ground water in the first drain or the second drain to flow to the sump.

The method may further include forming a bottom concrete layer by pouring a predetermined mortar on the second drainage material and the discarded concrete layer.

In addition, the first drain and the second drain is characterized in that interconnected by a connecting member.

In addition, the connecting member is characterized in that the installation is embedded in the three process.

In addition, the connecting member is characterized in that the inserting the predetermined position of the discarded concrete layer by opening in a predetermined shape.

In addition, in the step 3, it is characterized in that a separate drainage material is added to the discarded concrete layer.

In addition, in the drainage system for draining the groundwater to the sump well formed on one side while preventing the high upwater pressure caused by the water head difference of the ground concrete generated in the lower concrete floor of the underground building structure, the top surface itself after the excavation, or the soil layer, the gravel layer, the burglary A first drain disposed on the gulting finish surface formed by using the same, a cast concrete layer formed by pouring mortar at a predetermined height on the upper side of the first drain and the gulting finish surface; It characterized in that it comprises a drainage, and the sump is connected to the ground water flowing into the first drainage or the second drainage to be stored.

In addition, the first drain and the second drain is characterized in that formed integrally connected.

In addition, the first drain and the second drain is separated from each other, the first drain and the second drain is characterized in that the separated end is interconnected.

In addition, the first drain and the second drain is separated from each other, the first drain and the second drain is characterized in that the interconnection by a connecting member.

In addition, the drainage is characterized in that the drainage is formed using any one of the drain mat, drainage plate, bundle tube, hollow tube, hose, plastic tube, perforated tube, non-perforated tube, wood, synthetic resin, vinyl, non-woven fabric or concrete block. do.

In addition, the discarded concrete layer is characterized in that the third drainage is further provided to be connected to the sump.

The configuration of the present invention as described above will be described in more detail with reference to each embodiment shown in the accompanying drawings.

3 is an embodiment of the present invention. The drainage construction method of the present invention connects the first drainage material 3 to the horizontal and vertical lattice shape on the gulto finish surface 20, such a connection to form a grid using a connector, or directly drainage and drainage material without a connector Can be connected. Some of the first drains become the main drainage, and finally, the groundwater transferred to the sump through the various drainages is finally treated as the sump 50.

As described above, when the first drainage channel 3 is not directly connected to the sump 50 by a specific working condition, or when the height of the drainage channel needs to be different, the first drainage material on the gulting finish surface 20 (3) is connected, and after casting the cast concrete 100, interconnected with the second drain 300 is directly connected to the sump 50 on the cast concrete 100, the first drain (3) ) Guides the groundwater in the flow through the second drain 300 to the sump (50).

The shape of the first drainage material 3 and the second drainage material 300 may be variously configured such as a drain mat, a drainage plate, a bundle pipe, a hollow pipe, a hose, a plastic pipe, a hole pipe, or a non-pipe pipe, and in particular, a bundle pipe S-shaped bundle tubes or plate-shaped bundle tubes may be used. In addition, the first drainage material 3 and the second drainage material 300 may be variously selected from materials such as wood, synthetic resin, geotextiles (meaning fabric, knitted fabric and nonwoven fabric), concrete block, or styrofoam. That is, there is no particular limitation as long as it has a formwork function for securing a predetermined space in which groundwater flows within the discarded concrete 100 layer.

At this time, the first drainage material 3 and the first drainage material 300 may be integrated or directly connected, or may be provided with a connecting member 400 such as a sleeve or a connector in the middle for convenience of connection. Such a connector can be configured as a PVC tube, a hollow tube, a perforated tube, a square box type, and the sleeve may use a steel tube, a P.E tube, or the like.

The connecting member 400 connects the connector or the sleeve to the first drainage material 3 in advance, and then casts the discarded concrete to provide a point for connection with the second drainage 300, or opens the drilled discarded concrete. By forming a part, the first drain 3 and the second drain 300 may be connected after the connector or the sleeve is mounted. In addition, as described above, the first drainage material 3 and the second drainage material 300 may be directly connected to each other without the use of the connecting member 400. Also, a method of constructing at various heights using a single drainage material from the beginning may also be used. It is possible. This will be described later.

Also in the construction method of the present invention, geotextiles (knitting, woven fabric, nonwoven fabric, web, mat, net grid and plastic sheet, etc.) on the gulting finish surface 20 and / or on the first drainage material 3 as in the conventional underground construction method. Including) 60, or only the first drain (3) can be used to wrap the geotextile. In addition, after the synthetic resin vinyl 70 is covered on the first drainage material 3 for waterproofing, the discarded concrete may be poured, and if necessary, the first drainage material may also be covered with the synthetic resin vinyl 70 on the gulto finish surface 20. 3) can be installed. In other words, the synthetic resin vinyl 70 and the geosynthetic fiber 60 can be used as needed in various locations and there is no limit to the use. In the following drawings, the geotextile 60 and the synthetic resin vinyl 70 are omitted for convenience.

4 is another embodiment, in which the first drainage 3 and the first drainage 300 is connected when the first drainage 3 serving as the main drainage does not reach the catchment 50. Is showing. 4, the connection member 400 is provided in the middle for the connection of both drains (3, 300), the connection member 400 is the first drain (3) or in advance before casting concrete as described above Although it may be connected to the second drainage 300, it may be connected to the second drainage 300 again after connecting the connecting member 400 to the first drainage (3) by drilling after casting discarded concrete.

5a to 5f are cross-sectional views illustrating the sequence of construction according to the method of the present invention. 5A to 5F, a method of constructing an integral drainage without a separate connecting member is shown. FIG. 5A illustrates a step of forming a gulting finish surface 20 after digging a basement layer, and FIG. 5B is a step of arranging a drain 3 on an upper side of the gulting finish surface 20.

After the drainage material 3 is disposed and geotextiles, synthetic resin vinyl, and the like are laid or wrapped around the drainage material or wrapped around it, concrete mortar is poured to form the first cast concrete layer 101 having a predetermined height. At this time, as shown in FIG. 5C, the first discarded concrete layer 101 may be formed only at an area of a part of the entire gulting finish surface 20 or at a part of the location. Therefore, after the first cast concrete layer 101 is formed, a part of the drain material 3 is buried by the first cast concrete layer 101, but the other part is placed in an open state to the outside.

Thereafter, as shown in FIG. 5D, the drainage material 3 of the portion not buried by the first cast concrete layer 101 is lifted from the gulting finish surface 20, or rolled to one side, and then placed as shown in [5]. The second mortar concrete layer 102 is formed by pouring concrete mortar for the portion that is not. The second discarded concrete layer 102 may be formed in parallel with the first discarded concrete layer 101, or may be configured to have different heights from each other. In addition, after the first cast concrete layer 101 is completely cured, the second cast concrete layer 101 may be formed, or after the first cast concrete layer 101 is poured, the drainage material 3 may be spaced apart from the second cast material. The discarded concrete layer 102 may be poured.

6a to 6g are cross-sectional views showing the sequence of construction according to another method of the present invention. 6A to 6G, a method of connecting two or more drainage materials is shown. The first drainage material 3 is positioned as shown in FIG. 6B at a predetermined position on the gulting finish surface 20 formed as shown in FIG. 6A, and concrete mortar is poured on the upper side thereof to form the discarded concrete layer 100. .

The discarded concrete layer 100 may be formed through the drilling operation as shown in FIG. 6D or by using an additional formwork, a connector, a sleeve, or the like, to form the opening 103. 6E to 6G illustrate a method in which the first draining material 3 and the second draining material 300 are connected to the connection members 401, 402, and 403 of various methods. As shown in FIG. 6E, the connecting member 401 may penetrate the discarded concrete layer 100, and as illustrated in FIG. 6F, the connecting member 402 may be located in the discarded concrete layer 100 or as illustrated in FIG. 6G. ) May be located above the discarded concrete layer 100.

In some cases, the first drainage material 3 is connected to the first drainage material 3 and the second drainage material 300 before the casting concrete 100 is poured. To be in contact with the reduction surface 20, the second drain 300 may be configured to be positioned above a certain height. In addition, the process of making the 1st drainage material 3 and the 2nd drainage material 300 have a mutual height difference can also be repeated 2 or more times, and can form a multistage shape.

FIG. 7 shows another embodiment in which several first drainers 3 are connected to one second drainer 300. In the present invention, as shown in FIG. 5, no particular limitation is imposed on the configuration and configuration of the connection between the first drain 3 and the second drain 300, and through the connection of the first drain 3 and the second drain 300. When the first drainage material 3 is not connected to the sump well 50 due to the joint construction of the floor concrete 200 at the actual construction site, the breakage of the first drainage material 3, etc. The first drain 3 may be led to the sump through the second drain 300.

8 is another embodiment, the drainage material 3b connected by the first drainage material 3a connected to the second drainage material 300 and the drainage material 3c connected from the discarded concrete layer 100 to the sump well. Is showing. As described above, the present invention does not mean that all drainage materials are connected to the second drainage material 300 so that the water collecting wells may be passed through. Optionally, the first drainage material 3 may be selectively connected to the second drainage material 300 when necessary. It can be seen that it is characterized by.

9 is a perspective view of Figure 10 and the cross-sectional view of Figure 10 is a connector 1000 improved to be applicable to the method of the present invention Utility Model Registration No. 314875, which is a conventional design technology, unlike the prior art in the proper position of the upper case 110 The opening 140 may be installed to connect with the second drain 300 through this portion.

11 illustrates a state in which the first drains 3a and 3b are connected to the second drains 300 using the connector 1000. In FIG. 11, the discarded concrete 100 and the bottom concrete 200 are not illustrated in order to understand the connection state of the respective drainage materials. The drainage material 3a, which serves as a catchment of the first drainage material 3, is connected to the connector 1000. In the case of the drainage material 3b, which serves as the main drainage, the connector 1000 may not be connected to the water collecting well 50. ) Therefore, as shown in FIG. 11, the second drain member 300 is connected through the upper opening 140 of the connector 1000 to finally communicate with the collecting well 50.

FIG. 12 is a cross-sectional view of FIG. 11 and illustrates a state in which the first drainers 3a and 3b are connected to the second drainer 300 through the opening 140 after the first drainers 3a and 3b are connected in a lattice form using the connector 1000 of the present invention. Is showing. In general, when the connector 1000 is used, it is preferable to use a drain pipe 3b in the form of a bundle pipe as a main drain and to use a drain mat 3a as a drain for drainage.

FIG. 13A is a view illustrating that the shape of the second drainage material 300 may have various changes, not just a straight line, in the present invention. In particular, as shown in FIG. Can be. The second drainage material 300 of the “∩” type extends the sleeve installed as the connecting member 400 on one side of the first drainage material 3 or binds the uppermost bent portion to the reinforcing steel or the wire mesh embedded in the bottom concrete 200. Can be installed. By having a "∩" type in a part of the second drain 300, it has the effect of a hydraulic pressure control can be adjusted to buffer, regulate the amount of groundwater flowing into the sump 50 by the groundwater head difference. . In some cases, the end of the second drain 300 may be horizontally formed as shown in FIG. 13B.

FIG. 14 illustrates an embodiment in which the second draining material 300 having a “∩” shape as shown in FIG. 13 is used together with the connector 1000 of the present invention. 12 is the same as the basic structure, it can be seen that the second drain 300 is curved in a "∩" type.

As described so far, there is no limitation in the connection method between the first drain 3 and the second drain 300 in the present invention, it can be connected in a variety of changes depending on the site situation, the second drain 300 It can be seen that the shape of may have a curve rather than a simple straight line.

The drainage material constructed by the method of allowing the construction of the drainage material communicated with each other in such a manner has the effect of buffering the pressure as much as the difference between the drainage materials. That is, when the upward hydraulic pressure is increased, if the pressure is smaller than the pressure due to the difference in height from the first drain to the second drain, the pressure is absorbed inside the drain and has a buffering effect.

The present invention is not limited to the configuration and effects due to the above embodiments, and includes a range that can be freely modified by those skilled in the art within the scope of the claims.

Drainage construction method using the basement floor concrete according to the present invention has the effect that can have flexibility according to the working environment in the drainage construction compared to the conventional method.

In addition, the present invention has the effect that it is possible to enable the construction of the drainage difficult to disconnect or integrally connected.

In addition, the present invention provides a method for interconnecting the drainage having a variety of heights, has the effect of enabling the construction of the drainage is difficult to disconnect or integrally connected.

In addition, the present invention is to have a height difference in the drain, it has the effect of mitigating the width of the change in displacement with the increase in the upstream pressure.

Claims (19)

In the construction method to form a drainage path for draining the groundwater to the sump well formed on one side while preventing the high upward water pressure caused by the water head difference of the groundwater generated in the lower concrete floor of the underground building structure, The upper surface itself or the after-layer after gravel, gravel layer. 1 step of stopping so that the oyster finish surface is horizontal using a barrel or the like; Two steps of installing a drain on the gulto finish surface functioning as a drain for allowing the ground water to flow in; Three steps of forming a first discarded concrete layer by pouring mortar to a predetermined height to cover the drainage material in the partial region in which the drainage material is installed and in the partial region of the gulting finish surface; In the step 3, the drainage material located in the other region where the first cast concrete layer is not formed is spaced apart from the gulting finish surface, and then mortar is poured into the gulting finish surface of the other region to make the second casting concrete. 4 process of forming a layer; And 5. The method of constructing a groundwater drainage channel for reducing the up-water pressure of the building, characterized in that it comprises a; 5 step of placing the drainage material in the other area spaced apart on the upper surface of the second cast concrete layer. The method of claim 1, And connecting the drainage material with the sump to allow the groundwater in the drainage to flow to the sump. The method of claim 1, Groundwater drainage for reducing the up-water pressure of the building, characterized in that it further comprises the step of forming a floor concrete layer by placing a predetermined mortar on the drainage material, the first cast concrete layer and the second cast concrete layer. Construction method. In the construction method to form a drainage path for draining the groundwater to the sump well formed on one side while preventing the high upward water pressure caused by the water head difference of the groundwater generated in the lower concrete floor of the underground building structure, A first step of stopping the gulto finish surface horizontally by using the upper surface itself after the gulting, or the remnant layer, the gravel layer, and the burl; A second step of installing a first drainage material that functions as a drainage to allow the groundwater to flow in and collect on the gulto finish surface; 3 to form a cast concrete layer by pouring mortar to a predetermined height so as to cover the first drainage material in a region where the drainage material is installed and the gulting finish surface; Four steps of installing a second drainage material on the discarded concrete layer after the three steps; And And a fifth process of connecting the first drain and the second drain to communicate with each other. 3. The method of claim 4, wherein Connecting the first drain or the second drain to the sump to flow groundwater in the first or second drain to the sump; Groundwater drainage method for reduction. The method of claim 4, wherein And forming a bottom concrete layer by pouring a predetermined mortar on the second drainage material and the discarded concrete layer. The method of claim 4, wherein Groundwater drainage construction method for reducing the up-water pressure of the building, characterized in that the first drain and the second drain is interconnected by a connecting member. The method of claim 7, wherein The connecting member is a groundwater drainage construction method for reducing the up-water pressure of the building, characterized in that the installation is buried in the three process. The method of claim 7, wherein The connecting member is a groundwater drainage construction method for reducing the up-water pressure of the building, characterized in that for inserting by opening a predetermined position of the discarded concrete layer in a predetermined shape. In the drainage system for draining the groundwater to the sump well formed on one side while preventing the high upwater pressure caused by the water head difference of the groundwater generated in the lower concrete floor of the underground building structure, A first drainage material positioned on the top surface itself after the gulting or on the gulting finish surface formed by using a residual soil layer, a gravel layer, a burl, or the like; A discarded concrete layer formed by pouring mortar to a predetermined height above the first drainage material and the gulting finish surface; A second drainage material disposed above the discarded concrete layer; And Groundwater drainage system for reducing the up-water pressure of the building, characterized in that it comprises a; a water collecting well connected to the ground water flows into the first drain or the second drain. The method of claim 10, The ground drainage system for reducing the up-water pressure of the building, characterized in that the first drain and the second drain is formed integrally connected. The method of claim 10, The first drain and the second drain is separated from each other, Groundwater drainage system for reducing the up-water pressure of the building, characterized in that the first drain and the second drain is separated end is interconnected. The method of claim 10, The first drain and the second drain is separated from each other, Groundwater drainage system for reducing the up-water pressure of the building, characterized in that the first drain and the second drain is interconnected by a connecting member. The drainage device of claim 1, wherein the drainage material is: Upward pressure of the building, characterized in that the drainage channel is formed by using any one of the drain mat, drain plate, bundle pipe, hollow pipe, hose, plastic pipe, oil pipe, non-pipe, wood, synthetic resin, vinyl, non-woven fabric or concrete block Groundwater drainage method for reduction. The method of claim 4, wherein the first drain and the second drain are: Upward pressure of the building, characterized in that the drainage channel is formed by using any one of the drain mat, drain plate, bundle pipe, hollow pipe, hose, plastic pipe, oil pipe, non-pipe, wood, synthetic resin, vinyl, non-woven fabric or concrete block Groundwater drainage method for reduction. The method of claim 10, wherein the first drain and the second drain are: Upward pressure of the building, characterized in that the drainage channel is formed by using any one of the drain mat, drain plate, bundle pipe, hollow pipe, hose, plastic pipe, oil pipe, non-pipe, wood, synthetic resin, vinyl, non-woven fabric or concrete block Groundwater drainage system for reduction. The method of claim 1, In the above 4 steps, Groundwater drainage construction method for reducing the up-water pressure of the building, characterized in that provided by adding a separate drain in the second cast concrete layer. The method of claim 4, wherein In the above 3 steps, Groundwater drainage construction method for reducing the up-water pressure of the building, characterized in that to add a separate drain in the discarded concrete layer. The method of claim 10, The groundwater drainage system for reducing the up-water pressure of the building, characterized in that the discarded concrete layer further comprises a third drainage connected to the sump.

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