KR100665986B1 - Drainage construction method to maintain proper water pressure - Google Patents

Abstract

The present invention relates to a drainage construction method for draining the groundwater around the lower part of the building and, more particularly, the groundwater penetrating from the lower part or side of the building is appropriately discharged through a collecting well, etc. The present invention relates to a method for constructing a drainage path where a balance between self-weight of a building and an action pressure of groundwater on the floor of a building can be balanced. The construction of the present invention, in the drainage construction method to prevent the high water pressure caused by the water head difference of the groundwater generated in the bottom of the underground building structure and to maintain the proper water pressure, the top surface itself after the excavation or the earth soil layer, gravel layer, the bag A horizontal stop working step of stopping the oyster finish surface horizontally using a layer or the like; A drainage installing step of installing drainage for drainage function on the gulto finish surface after the horizontal stop working process; A decompression work step of allowing the drainage path to ascend and descend by a predetermined height from the gulting finish surface; And a discarding concrete placing step of forming a discarding concrete layer by pouring mortar on the gulting finish surface to a predetermined height.

The present invention in constructing the drainage to prevent the up-water pressure of the groundwater, by configuring the drainage up and down to go up and down to have a certain head head at a predetermined position of the drainage or at the end of the sump side, evenly by a certain section The pressure is distributed to maintain and regulate the constant water pressure up to the floor of the building, and at the same time has the effect of preventing excessive groundwater discharge. In addition, the cross-sectional area of the discharge pipe to be different from each other, or to form a separate hole in the hollow pipe, to prevent the low pressure or vacuum in the discharge pipe to have an effect of preventing excessive discharge of groundwater due to the siphon effect.

Description

The construction method of basement drainage

1 is a view showing a cross section of a conventional drainage construction.

2 is an enlarged view showing a cross section of a conventional drainage construction.

3 is a view showing a variety of drainage construction method of the present invention.

4 is a view showing a drainage construction method of the present invention having various positions and paths.

5 is a view showing another drainage construction method of the present invention having various positions and paths.

6 is a view showing another drainage construction method of the present invention having a variety of positions and paths.

7 is a view showing various forms of the present invention drainage for preventing the siphon effect.

<Description of Signs of Major Parts of Drawings>

1: gulto finish noodle 10: drainage

12: connector 20: discarded concrete

30: sump 40: floor concrete

42: wall 50: tube

52: upward discharge pipe 54: downward discharge pipe

56: upper accommodation space 60: non-public hall

62: upward discharge pipe 64: downward discharge pipe

66: upper accommodation space 68: hall

The present invention relates to a drainage construction method for draining the groundwater around the lower part of the building and, more particularly, the groundwater penetrating from the lower part or side of the building is appropriately discharged through a collecting well, etc. The present invention relates to a method for constructing a drainage path where a balance between self-weight of a building and an action pressure of groundwater on the floor of a building can be balanced.

In general, when a large amount of groundwater exists around and underneath the building, the building receives a buoyancy force due to the groundwater, which causes the building to rise and is destroyed, threatening safety. On the contrary, if a large amount of groundwater existing around and underneath the building is removed by forced drainage, the ground where the groundwater existed suddenly becomes empty and the ground sinks, which causes the building to fall down and threaten its safety. .

Many methods are used through dead weight and permanent (buoyancy) anchors for the up-water pressure treatment on the foundation floor of the building, but this is limited in that the continuous reliability of the buoyancy anchor's tensile force is not guaranteed with respect to the durability and safety of the building. have. An improved method is to form an artificial catchment and drainage layer under the foundation floor so that the groundwater flowing into the site is collected in the catchment along the drainage path and pumped and discharged regularly so that the foundation floor concrete does not act as a positive pressure. Permanent drainage system method. 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 conventional general drainage system is shown in FIGS. 1 and 2. Referring to FIGS. 1 and 2, the drainage material (or formwork) 110 having a predetermined height is horizontally and / or vertically connected to each other at a predetermined interval and disposed horizontally on the gulto finish surface 101, but the rock layer While placing the nonwoven fabric (not shown) between the gulto finish surface 101 and the drainage 110 is installed so that the outlet of the drainage 110 gathered to one side is connected to the sump 130 and the mortar on a predetermined height It is a method of forming cast concrete 120 by pouring.

This conventional method is forced to drain through the sump 130, or directly connected to a separate discharge pipe (not shown) and in communication with the external main drain (not shown), so that it can be naturally drained by the upward pressure do. However, this drainage method has a problem that can not prevent ground subsidence due to excessive discharge.

Therefore, the groundwater discharge is prevented to prevent the upward pressure of the building, and at the same time, the excessive discharge is prevented, and the design ground water level, that is, the theoretical groundwater level is a balance between the force due to the pressure of the groundwater under the building. In order to be maintained, it is necessary to have a drainage system that collects groundwater that penetrates the bottom of the building through various intermediate methods until it reaches the design stability level, and discharges it only when it exceeds the design stability level. It became.

The present invention has been made to solve the above problems, the groundwater level of the bottom of the building does not exceed the design stable water level to avoid buoyancy acted by the groundwater threatens the safety of the building, and the groundwater is excessive It is an object of the present invention to provide a method for constructing a drainage structure for preventing forced drainage.

The construction of the present invention for achieving the above object is, in the drainage construction method for preventing the high up-water pressure caused by the water head difference of the groundwater generated in the bottom of the underground building structure and to maintain a proper water pressure, the upper surface after the excavation Horizontal stop working process to stop the oyster finish surface to be horizontal by using itself or the remaining soil layer, gravel layer, the barrier layer; A drainage installing step of installing drainage for drainage function on the gulto finish surface after the horizontal stop working process; A decompression work step of allowing the drainage path to ascend and descend by a predetermined height from the gulting finish surface; And a discarding concrete placing step of forming a discarding concrete layer by pouring mortar on the gulting finish surface to a predetermined height.

The depressurizing work process is characterized in that it comprises a construction method for causing the drainage material to rise and then descend by a predetermined height.

The drain material is characterized in that the non-porous form without a hole in the side.

The depressurizing work process includes: a construction method for connecting a separate pipe to the drain material, wherein the pipe is characterized in that the shape is to be lowered after ascending by a predetermined height from the position of the drain material.

The depressurizing work process is characterized in that after the discarded concrete pouring process, the drainage path is raised and lowered by a predetermined height.

The depressurizing work process is characterized in that after the bottom concrete is poured, the drainage path is raised and lowered by a predetermined height.

The pipe is characterized in that the air pipe.

The pipe is characterized in that it is installed to be sealed in the wall or pillar.

The pipe is connected to the drainage material and ascends by a predetermined height in the bottom concrete layer placed on top of the discarded concrete, and then descends to be connected to the sump collecting side, characterized in that it is installed to be sealed in the bottom concrete layer.

End of the lower portion of the pipe is characterized in that it is connected to a separate second drain.

The bottom concrete layer placed on top of the discarded concrete is formed with an upper channel connected to the drainage material, and the tube is connected to the upper channel.

The pipe is ascending and then descending by a predetermined height is connected to the lower channel formed in the bottom concrete layer, the lower channel is characterized in that it is directly connected to the collecting well side, or connected to a separate second drain.

The discarded concrete is characterized in that the upper channel is connected to the drainage is formed, the pipe is connected to the upper channel.

The pipe is raised by a predetermined height and then lowered, characterized in that connected to the water collecting well side from the upper side of the discarded concrete.

The pipe is ascending and then descending by a predetermined height is connected to the lower channel formed in the discarded concrete layer, the lower channel is characterized in that it is directly connected to the collecting well side, or connected to a separate second drain.

An end of the descending portion of the pipe is characterized in that it is connected to the sump formed on the gulto finish surface.

All or a partial cross-sectional area of the descending portion of the tube is characterized in that it is wider than the cross-sectional area of the rising portion of the tube.

The upper portion of the rising portion of the tube is characterized in that the upper receiving space larger than the cross-sectional area of the rising portion is provided.

The pipe cross-sectional area of the descending portion formed on one side of the upper accommodating space is characterized in that the shape is wider than the cross-sectional area of the rising portion of the pipe.

Another method of the present invention for achieving the above object is a horizontal stop working process for stopping the gulto finish surface horizontally by using the upper surface itself after the gulto, or the after-layer layer, gravel layer, the barrier layer; A collecting well installation step of installing a collecting well on one side of the gulto finish surface; A drainage installing step of installing drainage for drainage function on the gulto finish surface after the horizontal stop working process; A decompression operation step of allowing the end side of the drainage passage for discharging groundwater to the sump collecting side to rise and fall by a predetermined height from the gulting finish surface; And a discarding concrete placing step of forming a discarding concrete layer by pouring mortar on the gulting finish surface to a predetermined height.

The depressurizing work process includes: a construction method for connecting a separate non-tubular pipe to the drain material, wherein the pipeless pipe is shaped to be lowered toward the water collecting well after ascending by a predetermined height from the position of the drain material. .

The depressurizing work process includes: a construction method for connecting a separate non-pipe to the drain, wherein the pipe is shaped to descend toward a trench formed separately after ascending by a predetermined height from the position of the drain. .

All or part of the cross-sectional area of the lower portion of the tube is characterized in that the shape is wider than the cross-sectional area of the rising portion of the tube.

The upper end of the rising portion of the tube is characterized in that the upper receiving space larger than the cross-sectional area of the tube of the rising portion is provided.

The non-tubular cross-sectional area of the descending portion formed on one side of the upper receiving space is characterized in that the shape is wider than the cross-sectional area of the rising portion of the non-empty tube.

The hole is formed on the upper end side of the pipe.

The upper end side of the tube is characterized in that the opening and closing hole is formed.

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

3 is a view showing a variety of drainage construction method of the present invention. Referring to FIG. 3, various ways of drainage are shown. Drainage can be constructed in a variety of ways, such as A, B, C, and D.

The drainage path is raised and lowered to a position higher than the discarded concrete 20 and the bottom concrete concrete 40 while having a predetermined height upward from the drainage material 10 on the gulting finish surface 1. As a result, if the water head difference to the position where the upward water pressure of the groundwater flowing through the drain 10 rises below the water level, the water is not drained. This prevents a large amount of groundwater from being discharged even at the slight upward pressure.

A is a method of forming the drainage (10) itself to have a predetermined height upward and downward, B is a method of connecting to the sump (30) by connecting a separate (upside down) U-shaped pipe to the drainage (10) and , C is a way to configure the cross-sectional area of the lower pipe compared to the upper pipe cross-sectional area of the U-shaped pipe, D is a way to let the U-shaped pipe is responsible for the discharge at the sump (30) side end.

4 is a view showing a drainage construction method of the present invention having various positions and paths. Referring to FIG. 4, various examples of the method A of FIG. 3 are illustrated. (a) is an embodiment of a general scheme. The drainage material 10 disposed on the gulting finish surface 1 is raised by a predetermined height upward through the discarded concrete 20 and the bottom concrete concrete 40, and then lowered again to extend to the water collecting well side.

(b) is similar to (a) except that all components (E) are located within the building wall 42 or column.

(c) is similar to (b), except that some configuration F is located within the building wall 42 and the remaining portion G is exposed outside the wall 42. At this time, the rising side of the drain 10 may be inserted into the wall 42, the lower side may be inserted into the wall 42.

(d) is a form in which the horizontal position of the drain 10 is different. The original position of the drain 10 is placed on the gulting finish surface 1, the drain 10 after the rise and fall can be located above the discarded concrete 20. In some cases, it may be located in the discarded concrete 20 layer or on the upper surface of the discarded concrete 20.

(e) is similar to the form (d), except that the drainage material 10 after the lowering is inserted into the gulting finish surface (1). At this time, the gulto finish surface (1) may be dug and positioned, or may be formed by forming a separate trench.

(f) is a system in which a separate connector 12 is used between the drainage material 10 so as to have an inverted U-shaped shape. The shape of the connector 12 is not limited, and can be variously formed as long as the channel structure to raise and lower to have a predetermined height. The connector 12 is connected to a separate second drain 10a facing the collecting well side or the outside separately from the drain 10 is connected to one side. At this time, the drainage material 10 and the second drainage material (10a) should not be in communication with each other, if the communication will be impossible to decompress.

Drainage, connectors, pipes, etc. are to be raised and lowered and to be non-porous. That is, the internal groundwater should be sealed so that it does not discharge to the outside. If there is a hole or a hole communicating with the outside, groundwater may flow in the opposite direction. Therefore, drains, connectors, and pipes around the decompression position should all be made of non-perforated pipes. If they are not non-formed, they should be sealed in concrete to prevent communication with the outside, or be buried in a wall to discharge groundwater to the outside or inflow from the outside. It should not be possible.

The drainage structure can be configured in various ways, and the construction order can also be changed freely. This also applies to the construction process to be described below. Generally, the drain material 10 is placed on the gulting finish surface 1, and the bottom concrete 20 is poured, and then the floor concrete 40 is poured. At this time, prior to placing the discarded concrete 20 and the bottom concrete 40, it is preferable to form the drainage material 10 or a non-vacant pipe or other drainage path in advance.

However, after disposing the drainage material 10 in part by changing the construction order, the casting concrete 20 and the bottom concrete 40 are poured, and a hole is inserted in the corresponding position to insert an empty pipe or connect a sleeve or a connector. The drainage path may be formed, and when casting the discarded concrete 20 and the bottom concrete 40, etc., after connecting the sleeve and the connector with the drainage material in advance to form the upper or lower waterway, after finishing the pouring process It is also possible to use a method of connecting a mission, a separate connector, and the like. Alternatively, it is also possible to form a channel by drilling a hole in the bottom concrete layer or the discarded concrete layer.

For example, after the sleeve is connected to the end of the drainage in advance, the cast concrete 20 and the bottom concrete 40 are poured and the sleeve is exposed to be exposed upward, and then the other side is connected to the drain and the sleeve connected to the pipe. It can also be made to be connected directly to the other drainage material and a pipe. The order is not limited to the order set forth in the claims as long as the overall manner includes all the steps set forth in the claims.

In addition, the drainage channel is raised and lowered through the pipe can be connected to the water collecting well side by various routes through the top, inside or bottom of the bottom concrete, above, inside or below the discarded concrete.

5 is a view showing another drainage construction method of the present invention having various positions and paths. Referring to FIG. 5, a drainage path to the sump is separately formed from the drainage material 10. The drainage pipe 10 is connected to the non-empty tube 50 in various ways. Non-public pipe 50 may be connected to the sump well, it may be connected to the external main drainage to facilitate natural drainage.

Referring to (a), the hollow pipe 50 penetrates to the upper side of the discarded concrete 20 and the bottom concrete concrete 40, and ascends by a predetermined height, and then descends again. After falling, the bottom concrete concrete 40 It extends to the water collecting well above the lower discarded concrete 20 or below the discarded concrete 20.

Referring to (b), the air pipe 50 is extended upward and then extends again at the position inserted below the gulto finish surface (1). At this time, the gulting finish surface (1) may be dug into a predetermined depth, or may be inserted to form a separate trench.

Referring to (c), it is also possible to use a method that is connected to each other using a separate connector 52 between the drain 10 and the non-pipe (50).

6 is a view showing another drainage construction method of the present invention having a variety of positions and paths. Referring to FIG. 6, the end of the sump 30 is raised and lowered by a predetermined height to be discharged to the sump 30.

Referring to (a), the vacant pipe 60 connected to the drainage material 10 located on the gulto finish surface 1 is discharged downward by raising and lowering a predetermined height.

Referring to (b), the drain material 10 is located on the gulto finish surface (1). The air pipe 60 connected to the drain 10 is provided in a separate manner. At this time, in the initial stage of construction, the outlet of the sump well 30 of the drain material 10 is opened, but after the completion of the construction, the outlet H of the sump well 30 is blocked by a valve (not shown) or the like. 10) to be discharged along the non-empty pipe (30) flowing through the ground water. Since the initial pressure of the groundwater does not occur in the initial stage of construction, it is not necessary to reduce the pressure so that a separate pressure reducing means does not pass, and after the construction, upward pressure is generated, thereby passing the pressure reducing means. If the outlet (H) of the drain 10 is not closed at this time, the groundwater is discharged immediately without passing through the decompression means, it should be prevented.

Referring to (c), the drain 10 and the non-pipe 60 is connected to each other on the discarded concrete 20.

Referring to (d), the drainage material 10 and the non-pipes 60 are located in the lower part of the gulto finish surface (1), is connected. Drainage 10 or duct 60 may be located within the trench and interconnected.

In addition, the air pipe 60 may not fall directly into the sump 30, but fall to a separate trench connected to the sump, so that the groundwater dropped into the trench flows into the sump.

7 is a view showing various forms of the present invention drainage for preventing the siphon effect. Referring to Figure 7, there is disclosed a hollow tube of various shapes for preventing the siphon effect.

The present invention not only discharges groundwater to prevent excessive upward water pressure of groundwater, but also has an object of preventing ground subsidence due to excessive groundwater discharge. In the case of air pipes 50 and 60, a siphon phenomenon may occur due to the groundwater flowing through the internal cross-sectional area.

That is, while the groundwater flowing initially falls, a low pressure and a vacuum state are formed internally, and the groundwater which was in the lower side is attracted and discharged. In this case, in spite of the above-mentioned hydraulic pressure holding means, groundwater at a lower position is also discharged.

In order to prevent such a siphon phenomenon, various shapes of hollow tubes are used. Referring to (a), the cross-sectional area of the lower discharge pipe 54 is made larger than that of the upper discharge pipe 52. In this case, the groundwater flowing downwards does not fill all the cross sections, and since the empty space is generated, the groundwater of the upper discharge pipe 52 may be prevented from coming up.

Referring to (b), the upper receiving space 56 is formed in the upper end between the upper discharge pipe 52 and the lower discharge pipe 54. The upper accommodating space 56 is a sealed volume of a predetermined volume and has a large cross-sectional area with the lower discharge pipe 54 having a large cross-sectional area. Therefore, the groundwater rising along the upper discharge pipe 52 reaches the upper receiving space 56 and flows down to the lower discharge pipe 52 without siphoning.

Referring to (c), the anti-siphon structure in the empty pipe 60 discharged to the water collecting well side is shown. As described above (b) and (c) it is also possible to form a wide cross-sectional area of the lower discharge pipe 64, it can be formed separately in the hole (68). Since the hole 68 supplies air into the hollow tube 60, the hole 68 serves to prevent the low pressure and vacuum from occurring in the hollow tube 60.

Referring to (d), it is possible to increase the cross-sectional area of the lower discharge pipe 64 together with the hole 68 so as to act simultaneously with the function of the hole 68.

In addition, the hole 68 may be effectively used to clean the inside of the upper discharge pipe and the lower discharge pipe. It may be used to force water through the hole 68 into the discharge pipe to forcibly drain the sediment accumulated and accumulated in the discharge pipe to the sump. In addition, the hole 68 may be opened or closed through a valve (not shown) according to a selection. In particular, in the case where the hole 68 is formed in the decompression means provided in the middle of the drainage passage instead of the collecting well-side decompression means, a valve must be provided to prevent the high pressure groundwater from overflowing into the hole due to a sudden increase in the water pressure.

According to the construction of the drainage as described above, it is possible to appropriately reduce the pressure applied to the drainage material and the discharge pipe every middle of the drainage path, and also to adjust the pressure in the portion discharged from the sump side. This reduces the excessive pressure on the drain and the discharge pipe, and serves to prevent a large amount of groundwater from being discharged even at a slight upward pressure.

In addition, there are no particular restrictions on the shape, material, and type of the drainage, pipe, and non-pipe, and may be variously used by those skilled in the art. For example, a drain plate, a bundle pipe, a hollow pipe, a hose, a plastic pipe, a PE pipe, a steel pipe, etc. may be used. It may be, to form a form in a hollow shape to be in the form of a tube may be included in the range. In addition, the present invention is not limited to the path and shape of the drainage, non-empty tube shown in the drawings, it can be configured in various embodiments.

The present invention in constructing the drainage to prevent the up-water pressure of the groundwater, by configuring the drainage up and down to go up and down to have a certain head head at a predetermined position of the drainage or at the end of the sump side, evenly by a certain section The pressure is distributed to maintain and regulate the constant water pressure up to the floor of the building, and at the same time has the effect of preventing excessive groundwater discharge.

The present invention has an effect of preventing the excessive discharge of ground water due to the siphon effect by preventing the cross-sectional area of the discharge pipe to be different from each other, or to form a separate hole in the non-empty pipe to prevent the low pressure or vacuum state in the discharge pipe.

Claims (27)

In the drainage construction method to prevent the high up water pressure caused by the water head difference of the ground water generated in the bottom of the underground building structure and to maintain the proper water pressure, A horizontal stop working step of stopping the gulto finish surface horizontally by using the upper surface itself after the gulting or the remaining soil layer, the gravel layer, the buffing layer, etc .; A drainage installing step of installing drainage for drainage function on the gulto finish surface after the horizontal stop working process; A decompression work step of allowing the drainage path to ascend and descend by a predetermined height from the gulting finish surface; And A casting method for drainage construction for maintaining proper hydraulic pressure, characterized in that it comprises a; cast concrete mortar on the gulting finish surface to form a discarded concrete layer to form a cast concrete layer. The process of claim 1 wherein the depressurization process is: The drainage construction method for maintaining the proper hydraulic pressure, characterized in that it comprises a construction method for raising and descending the drainage by a predetermined height. The method of claim 2, The drainage method is a drainage construction method for maintaining the proper hydraulic pressure, characterized in that the non-porous form without a hole in the side. The process of claim 1 wherein the depressurization process is: Including a construction method for connecting a separate pipe to the drain, The pipe is a drainage construction method for maintaining a suitable hydraulic pressure, characterized in that the descending shape after rising by a predetermined height from the position of the drain. The method of claim 1, The decompression work step is a drainage construction method for maintaining the proper hydraulic pressure, characterized in that to drop after raising the drainage by a predetermined height after the cast concrete pouring process. The method of claim 1, The decompression work step is a drainage construction method for maintaining the proper hydraulic pressure, characterized in that after the bottom concrete is poured to increase the drainage by a predetermined height and lowered. 5. The method of claim 4, wherein the pipe is a non-empty pipe. 5. The method of claim 4, wherein the pipe is installed to be sealed in a wall or a pillar. The method of claim 4, wherein The pipe is connected to the drainage and ascends by a predetermined height in the bottom concrete layer placed on top of the discarded concrete, and then descends to be connected to the water collecting well side, and is installed to be sealed in the bottom concrete layer. Drainage construction method for maintenance. The method of claim 4, wherein An end of the descending portion of the pipe is a drainage construction method for maintaining a proper water pressure, characterized in that the connection with a separate second drain. The method of claim 4, wherein The bottom concrete layer placed on top of the discarded concrete is formed with an upper channel connected to the drainage material, The drainage construction method for maintaining an appropriate water pressure, characterized in that the pipe is connected to the upper waterway. The method of claim 11, The pipe is connected to a lower channel formed in the bottom concrete layer while rising and lowered by a predetermined height, and the lower channel is directly connected to a collecting well side, or connected to a separate second drainage. Drainage construction method. The method of claim 4, wherein The discarded concrete is formed with an upper channel connected to the drainage material, Drainage construction method for maintaining the proper hydraulic pressure, characterized in that the pipe is connected to the upper waterway. The method of claim 13, The pipe ascends by a predetermined height and then descends to the drainage construction method for maintaining the proper hydraulic pressure, characterized in that connected to the water collecting well side from the upper side of the discarded concrete. The method of claim 13, The pipe is raised and lowered by a predetermined height while being connected to the lower channel formed in the discarded concrete layer, the lower channel is connected directly to the water collecting well side, or connected to a separate second drainage for maintaining the proper hydraulic pressure Drainage construction method. The method of claim 4, wherein End of the descending portion of the pipe drainage construction method for maintaining a suitable hydraulic pressure, characterized in that connected to the water collecting well formed on the gulto finish surface. The method of claim 4, wherein All or a partial cross-sectional area of the descending portion of the pipe is wider than the cross-sectional area of the rising portion of the pipe is a drainage construction method for maintaining the proper hydraulic pressure. The method of claim 4, wherein The upper part of the rising portion of the pipe is a drainage construction method for maintaining a suitable hydraulic pressure, characterized in that the upper receiving space larger than the pipe cross-sectional area of the rising portion is provided. The method of claim 18, Pipe cross-sectional area of the descending portion formed on one side of the upper accommodating space is a drainage construction method for maintaining a suitable hydraulic pressure, characterized in that the wider than the cross-sectional area of the rising portion of the pipe. In the drainage construction method to prevent the high up water pressure caused by the water head difference of the ground water generated in the bottom of the underground building structure and to maintain the proper water pressure, A horizontal stop working step of stopping the gulto finish surface horizontally by using the upper surface itself after the gulting or the remaining soil layer, the gravel layer, the buffing layer, etc .; A collecting well installation step of installing a collecting well on one side of the gulto finish surface; A drainage installing step of installing drainage for drainage function on the gulto finish surface after the horizontal stop working process; A decompression operation step of allowing the end side of the drainage passage for discharging groundwater to the sump collecting side to rise and fall by a predetermined height from the gulting finish surface; And A casting method for drainage construction for maintaining proper hydraulic pressure, characterized in that it comprises a; cast concrete mortar on the gulting finish surface to form a discarded concrete layer to form a cast concrete layer. The process of claim 20 wherein the depressurization process is: Including a construction method for connecting a separate non-empty tube to the drain, The pipe is a drainage construction method for maintaining the proper hydraulic pressure, characterized in that the shape of the descending toward the sump after rising by a predetermined height from the position of the drain. The process of claim 20 wherein the depressurization process is: Including a construction method for connecting a separate non-empty tube to the drain, The pipe is a drainage construction method for maintaining the proper hydraulic pressure, characterized in that the ascending downwards toward the trench formed separately after ascending by a predetermined height from the position of the drain. The method of claim 21 or 22, All or a partial cross-sectional area of the descending portion of the tube is a drainage construction method for maintaining a suitable hydraulic pressure, characterized in that the wider than the cross-sectional area of the rising portion of the tube. The method of claim 21 or 22, The drainage construction method for maintaining a suitable hydraulic pressure, characterized in that the upper end of the rising portion of the pipe is provided with an upper receiving space larger than the cross-sectional area of the pipe of the raised portion. The method of claim 21 or 22, The non-pipe section of the descending portion formed on one side of the upper receiving space is a drainage construction method for maintaining a suitable hydraulic pressure, characterized in that the wider than the cross-sectional area of the rising portion of the pipe. The method of claim 21 or 22, The drainage construction method for maintaining the proper hydraulic pressure, characterized in that the hole is formed on the upper end side of the pipe. The method of claim 4, wherein The drainage construction method for maintaining the proper hydraulic pressure, characterized in that the opening and closing hole is formed on the upper end side of the pipe.

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