KR100856388B1 - Structure and method for draining underground water, and valve device thereof - Google Patents

Abstract

An underground water drainage structure is provided to discharge underground water at need with a simple structure, to require a small space for installation, to make installation simple and to shorten a period of installation, to construct with low expenses. An underground water drainage structure(110) comprises a perforated pipe(114), an extension pipe(136) connected with the perforated pipe to supply a passage for moving underground water, an extension pipe valve(132) installed to the end of the extension pipe connected to a water collecting well to open or close the extension pipe, a water pressure sensor(134) located in the extension pipe to sense water pressure in the extension pipe, a water collecting well(128), and a drain device for discharging the water gathered into the water collecting well to the outside.

Description

Groundwater drainage structure and drainage method and valve device for groundwater drainage structure {STRUCTURE AND METHOD FOR DRAINING UNDERGROUND WATER, AND VALVE DEVICE THEREOF}

The present invention relates to a structure for draining groundwater around a building, and more particularly, to a groundwater drainage structure that automatically adjusts the groundwater around the building so as not to exceed the design stable water level.

Under the large buildings such as apartments and shopping malls, underground structures such as underground parking lots are formed. These underground structures are buoyant by the surrounding groundwater, and these buoyancy greatly reduces the stability of the building when it is above a certain size. This concern is especially acute during the rainy season, due to high precipitation, which increases the level of adjacent rivers. Anchor method and drainage method to solve the risk of buoyancy caused by groundwater. The anchor method is to offset the influence of buoyancy to raise the building by the friction force between the ground and the anchor by forming the anchor connected to the structure and steel wire in the ground, which is expensive, corroded steel wire or low strength, etc. There is a problem and it is replaced by the drainage method recently. Drainage is a method of reducing buoyancy by lowering the groundwater level around buildings by discharging groundwater to the outside.

In the drainage system for this purpose, a porous tube or drainboard drain board, commonly referred to as a “pore pipe”, is installed in the ground below the foundation of the building. Groundwater from the ground penetrates into the perforated pipes or sump and travels along the passage to the sump. In this way, the water collected in the sump is drained to the external sewer by a pump.

However, in such a conventional drainage system, even when the positive pressure caused by the groundwater acting on the building is not large enough to threaten the building, the groundwater continues to collect in the collecting well through the perforated pipe, so it is continuously pumped to the sewage system. It must be drained.

Forced drainage of groundwater from a sump is expensive, including electricity costs and drainage pump maintenance costs. In addition, the sewage system usage fee may be charged depending on the region of the water collected by the sump and drained to the public sewage system. In addition, the groundwater is drained and mixed with fine soil, and if such a process continues for a long time, the ground is soft, which may seriously damage the stability of the building. Therefore, the conventional drainage system as described above has a problem that the economic efficiency is also lowered and the stability of the building in the long run,

1 shows another conventional drainage system 10 that solves this problem. The drainage system 10 includes the infiltration water trench 12, the perforated pipe 14, the vertical connector 16, the horizontal connector 18, the drainage passage 22, the collecting plumb pipe 24, and the structural plumbing pipe 26. , And a sump 28.

Groundwater around the building penetrates into the perforated pipe 14 through the infiltration water trench 12, and the groundwater that accumulates in the perforated pipe 14 rises along the vertical connecting pipe 16 in communication with the perforated pipe 14 to provide a horizontal connection pipe ( It flows along 18) to the catchment vertical pipe 24. The catchment vertical pipe 24 is open at the top of the same level as the design stable water level set in consideration of the safety factor in the groundwater level in which the building can maintain stability against buoyancy. Groundwater flowing from the top of the sump vertical pipe 24 flows down along the outer surface of the sump vertical pipe 24 to reach the sump well 28 along the drainage passage 22. Groundwater collected in the sump 28 is drained to the sewer by a pump. In such a drainage system 10, the groundwater is drained only when the groundwater level exceeds the design stable water level, so the amount of groundwater drained is significantly reduced.

On the other hand, in the drainage system 10, the groundwater in the horizontal connection pipe 18 is lower than the water collecting vertical pipe 24, the air mixed in the groundwater can prevent the smooth flow of groundwater. In order to prevent this, the drainage system 10 has a structural plumbing pipe 26. Air trapped in the groundwater of the horizontal connection pipe 18 is discharged to the outside through the structural plumbing pipe (26). As a result, the groundwater in the horizontal connection pipe 18 may have a continuous flow. Structural plumb pipe 26 has an open upper end higher than the upper end of the catchment vertical pipe 24, so that unless there is a sudden increase in the groundwater level, ground water does not overflow and performs only an air discharge function.

However, in the conventional drainage system 10, the vertical pipes having a height higher than the design stable water level protrude vertically to an underground structure such as an underground parking lot, and the groundwater flows along the outer wall, thereby damaging the appearance. Therefore, although the vertical pipes are installed in close contact with the wall or pillar and a plastic cover is installed around the vertical pipes, the appearance is inevitably deteriorated compared to the case where the vertical pipes are not provided. In addition, the plastic cover is easily broken when hitting the vehicle. Installing a catchment plumbing pipe in or near the sump may interfere with other processes, such as installing a drain pump and installing a sump cap. In addition, the groundwater flowing over the top of the vertical pipe and flowing along the drainage passage at the bottom of the parking lot is not good for hygiene such as providing moisture in the underground structure and odors. In particular, the drainage system 10 takes a long time to install because after the ground is trimmed and the trenches 12 and the perforated pipes 14 are installed, the foundation can be completed only after the foundation of the building is completed and a considerable part of the underground structure is completed again. Therefore, there is a problem that the overall cost is also greatly increased.

In the present invention, this problem is solved simply by using a valve means that opens when the groundwater pressure is more than the reference pressure. However, such valve means must be able to reliably open to relatively small groundwater pressure changes, and watertightness must be ensured, which is difficult to meet with such a conventional valve device.

The present invention is to solve the problems of the above-described conventional drainage system, an object of the present invention is to provide a groundwater drainage structure that discharges groundwater only when necessary in a simple structure.

The present invention also aims to provide a groundwater drainage structure which requires only a small space for installation.

The present invention also aims to provide a groundwater drainage structure that is simple to install and has a short installation work period.

The present invention also aims to provide a groundwater drainage structure that can be constructed at low cost.

The present invention also aims to provide a valve suitable for the above groundwater drainage structure.

The present invention also has several other objects apparent from the description of the present invention described later.

The groundwater drainage structure of the present invention for achieving the above object is a water collecting well, a means located in the lower part of the building foundation and the groundwater flows in, the outlet is formed in the water collecting well and groundwater flow between the groundwater inflow means and the water collecting well Groundwater guide means for providing a passage and the valve means is installed adjacent to the outlet of the groundwater guide means and opened when the groundwater water pressure exceeds a predetermined reference water pressure corresponding to the design stable water level of the building. The inflow means may be composed of a trench formed in the ground, a perforated pipe, a drain board, and the like, which are installed through the permeable member on the trench. The valve means is closed when the groundwater pressure is lower than the reference water pressure. The reference water pressure may be defined as a single water pressure or a range of water pressures depending on the response performance of the valve means.

The valve means may include a valve, a groundwater pressure sensor, an actuator for controlling opening and closing of the valve, and a control unit for giving a valve opening / closing command to the actuator according to the magnitude of the pressure signal of the sensor. Or it may be configured as a mechanical valve that opens and closes according to the size of the hydraulic pressure.

The groundwater drainage structure of the present invention also includes a catchment well located in the underground structure of the building, a perforated pipe located at the base of the building, an extension pipe having one end connected to the perforated pipe extending on the same plane as the perforated pipe, and the other end being located in the well. When the water pressure in the extension pipe is greater than or equal to the reference water pressure, the other end of the extension pipe may be opened and less than that may be configured as a valve device for closing the other end of the extension pipe. The valve device may be composed of an actuator, a valve for interlocking the operation of the actuator to open and close the extension pipe, a hydraulic pressure sensor for detecting the water pressure in the extension pipe, a control unit for giving a valve opening and closing command to the actuator according to the detection signal of the hydraulic pressure sensor. It may be a mechanical valve device that is opened and closed mechanically according to the water pressure.

In still another aspect of the present invention, the groundwater drainage structure of the present invention is a water collection well located in the underground structure of the building, a perforated pipe located below the foundation of the building, embedded in the building foundation concrete above the perforated pipe and one end is exposed in the collection well A horizontal connector forming an outlet, a lower end connected to the perforated tube, and an upper end connected to the vertical connector connected to the horizontal connector, and the outlet is opened when the water pressure in the horizontal connector is equal to or greater than a reference pressure; It can be configured as a horizontal connecting valve device for closing the.

The present invention may also be implemented in the form of a groundwater drainage method for minimizing the risk factor of the building due to groundwater buoyancy by lowering the groundwater level around the building. The method includes the steps of introducing groundwater around the building into a flow path inside the building, discharging the ground water to the sump through a connection pipe parallel to the flow path with an outlet in the sump, and collecting the water collected in the sump. Draining is done. In the step of discharging the groundwater to the sump well, the groundwater pressure is detected, and when the detected water pressure is equal to or greater than the standard water pressure, the outlet of the connection pipe is opened, and the outlet of the connection pipe is closed under the water pressure lower than that.

Unlike the conventional drainage system, the drainage structure of the present invention includes a sensor for detecting a change in the positive pressure of the groundwater in the lower part of the foundation of the building, and a valve that opens and closes in response to the positive pressure change detected by the sensor. Accordingly, it is possible to minimize the risk of the building caused by groundwater and at the same time to minimize the amount of groundwater collected by the sump.

In addition, since a vertically installed drainage pipe required by the conventional drainage facility is not required in the drainage structure according to the present invention, the drainage structure may be installed under or under the foundation concrete of the building. Therefore, it is possible to complete the installation of the drainage structure in short air, unlike the prior art, which had to install the vertical pipe after the foundation of the building was sufficiently formed.

In addition, compared with the conventional drainage structure in which the vertical drainage pipe protrudes from the bottom of the underground space, the underground space of the building can be utilized to the maximum, and the appearance and hygiene are improved.

In addition, in the conventional drainage structure, while the process is complicated when adjusting or changing the height of the vertically installed drain pipe, the drainage facility according to the present invention easily solves the problem of unskilled workers by simply operating the sensor and the related device. Can be.

In addition, in the conventional drainage structure, when the depth of the underground structure goes down three or more floors, it may be necessary to install the drainage pipe installed vertically through one floor or two or more floors, and to lengthen the floor. You may. There is no such risk in the present invention since no vertical drainage pipe is required.

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

2 shows a drainage structure 110 according to an embodiment of the present invention.

The drainage structure 110 may include a hole pipe 114, an extension pipe 136, an extension pipe valve 132, a hydraulic pressure sensor 134, a sump well 128, and a drainage means for discharging water collected in the sump well to the outside (not shown). It is composed of Extension tube 136 is connected to the perforated tube 114 at one end to provide a passage for the groundwater to move to the sump. The extension pipe valve 132 is installed at the end of the extension pipe 136 leading to the sump well to open or close the extension pipe 136. The hydraulic pressure sensor 134 is located at least in the extension tube 136 to sense the water pressure in the extension tube 136. This is to make it easy for the operator to access the water pressure sensor 134 during management or maintenance, and if necessary, the water pressure sensor 134 may be installed in the oil hole pipe 114 or another place where the groundwater water pressure measurement is possible. It is possible.

The detection signal of the hydraulic pressure sensor 134 is transmitted to a controller (not shown). When the groundwater level rises and the water pressure signal becomes greater than or equal to the design stable water level, the control unit issues an actuator (not shown) operation command to open the extension pipe valve 132. If the groundwater level is reduced and the water pressure signal is less than a predetermined size, the control unit closes the extension pipe valve 132 in a similar manner. The magnitude of the hydraulic pressure signal for determining whether the extension pipe valve 132 is closed may be a size corresponding to the design stability level or may be somewhat smaller. Operation of the drainage means may be associated with opening and closing of the extension tube valve 132. For example, when the control unit issues an actuator operation command to open the extension tube valve 132, the drain pump starts operation in association with the extension tube valve 132, and when the control unit issues a command to close the extension tube valve 132, the drain pump operates in response to the command. You can stop it.

3 shows an example of the arrangement of the hole. The hole tube 114 is installed on the trench 112 formed in the ground of the lower part of the building foundation 140. In the trench 112, a permeable member 113, such as sand gravel, is first laid, and a perforated tube 114 wrapped around a nonwoven fabric is disposed on the permeable member. Accordingly, if the groundwater is discharged from the ground and accumulated in the trench 112, the groundwater passes through the permeable member 113 and the nonwoven fabric and penetrates into the perforated tube 114 through the hole in the perforated tube 114. The nonwoven fabric at this time serves to prevent the inflow into the perforated pipe 114 by filtering the soil mixed in the ground water.

4 shows a cross section of an groundwater drainage structure 210 according to a second embodiment of the invention. The drainage structure 210 is different from the drainage structure 110 of the first embodiment in that the connection pipe is installed on the upper portion of the perforated pipe.

The connector consists of a vertical connector 216 and a horizontal connector 218. The vertical connector 216 has a lower end connected to the perforated tube 214 and an upper end connected to the horizontal connector 218. A plurality of perforated pipes 214, vertical connecting pipes 216, and horizontal connecting pipes 218 are respectively provided to form groundwater passages connected to each other over a large area. The groundwater flow passage provided by the horizontal connector 218 extends to the sump 228. A horizontal connector valve 232 is installed at an end of the horizontal connector 218 extending to the sump 228. On the connection pipe 218 adjacent to its end is also provided a water pressure sensor 234 for detecting the water pressure inside the connection pipe. The operation of the horizontal connector valve 232 and the hydraulic pressure sensor 234 is equivalent to the operation of the extension tube valve 132 and the hydraulic pressure sensor 134 of the first embodiment.

In the drainage structure 210, despite the filtering means such as non-woven fabric, mixed with groundwater, foreign matter such as soil penetrates into the oil hole pipe 214 and is deposited inside the oil hole pipe 214 for a long time, so that groundwater flow through the oil hole pipe 214 is maintained. Even when it is not smooth, groundwater discharge can be made smoothly. This is because the perforated pipe 214 is connected with the horizontal connector 218 through a plurality of vertical connectors 216 so that groundwater can flow freely through these connectors. The vertical connection pipe 216 and the horizontal connection pipe 218 may be embedded in the concrete foundation of the building, in which case no need for additional excavation and also does not occupy the space inside the building.

The water pressure sensor 234 is for detecting the positive pressure according to the groundwater level in the lower part of the building foundation. As the positive pressure of groundwater under the foundation of the building increases, the pressure of groundwater in the connecting pipes increases. Therefore, it is possible to detect the change in the positive pressure of the groundwater under the building foundation by measuring the pressure of the groundwater in the connecting pipe.

For example, the hydraulic pressure signal from the hydraulic pressure sensor 234 is compared with a predetermined reference value in the controller. The reference value is set based on the positive pressure of the groundwater or the positive pressure reflecting the safety factor under the building foundation. When the water pressure signal reaches the reference value, the horizontal connection valve 232 is automatically opened and the groundwater is discharged to the sump 228.

The hydraulic pressure sensor 234 may be configured as a built-in horizontal connector valve 232. In this case, the micro-hydraulic pressure sensor embedded in the valve detects a change in the positive pressure of the groundwater at the base of the building by comparing the measured groundwater pressure with a predetermined reference value. That is, when the measured groundwater pressure exceeds a predetermined reference value, the micro-hydraulic pressure sensor built in the valve determines that the positive pressure at the lower part of the building foundation is raised to dangerously cause the building to open the horizontal connector valve 232. Send it.

The hydraulic pressure sensor 234 continuously or repeatedly measures the pressure of the groundwater in the horizontal connector 218 even after the horizontal connector valve 232 opening signal is transmitted to detect a change in the positive pressure of the groundwater under the building foundation. The control unit detects the change in the positive pressure of the groundwater at the base of the building by comparing the magnitude of the pressure signal of the groundwater detected after the open signal and the reference value. If the magnitude of the measured signal after the open signal is lower than the reference value, it is determined that the positive pressure in the lower part of the building foundation is lower than the level at which the building is dangerous, and the closing signal is transferred to the opening and closing device of the horizontal connector valve 232. send.

Therefore, the groundwater is discharged to the sump 228 only when the positive pressure is excessively high, and the amount of groundwater collected in the sump 228 is adjusted. Groundwater collected in the sump 228 may be forcedly drained through a drainage pump or the like, or may be naturally drained depending on the terrain.

Further, the valve device of the present invention may be a mechanical valve device. In this case, a sensor for detecting the water pressure is not necessary.

5 shows an example of the mechanical valve device of the present invention. The mechanical valve device 400 includes a housing 410, a diaphragm 430, a spring 450, a top plate 470 and a valve 481. The valve device 400 also includes an outer casing 500 for protection against external shocks and for improved water tightness. The housing 410 is fixed in the casing 500. The valve device 400 comprises a groundwater inlet 422 which is in communication with the groundwater guiding means, ie the end of the extension pipe 136 or the horizontal connecting pipe 218, so that the groundwater flows into the valve device 400. The valve device 400 also includes a groundwater outlet 424 so that if the groundwater pressure is greater than or equal to the reference water pressure, groundwater is discharged to the outside through the groundwater outlet 424 while the valve 481 is opened. The valve device 400 is installed in the sump 228, and the groundwater discharged from the groundwater outlet 424 of the valve device 400 is immediately collected in the sump 228. Depending on the building structure, it is also possible to arrange the valve device 400 spaced apart from the sump 228 and to connect a drain pipe between the two.

The housing 410 is composed of an upper housing 412 and a lower housing 414. The diaphragm 430 is interposed between the upper housing 412 and the lower housing 414 and fastened by bolts together with the upper housing 412 and the lower housing 414. Accordingly, the internal space of the housing 410 is partitioned into a first space above the diaphragm 430 and a second space below it.

The diaphragm 430 is made of a material having flexibility, waterproofness, and dimensional stability. For example, the multilayer sheet material which combined the rubber sheet excellent in waterproofness on both surfaces of the fabric sheet which is excellent in dimensional stability can be used.

The upper plate 470 is tightly coupled to the diaphragm 430 in the first space. The spring 450 is installed in the first space. The spring 450 is compressed and its lower end is seated on the upper plate 470, and the upper end is seated on the spring seat 440 installed at the upper end of the upper housing 412. do. Thus, the top plate 470 is always biased downwards by the compressed spring 450. Top plate 470 and spring sheet 440 are provided with grooves 475 or protrusions 445 for seating the springs.

One end of the adjustment shaft 460 is connected to a surface opposite the seating surface of the spring 450 of the spring seat 440. The other end of the adjustment shaft 460 is exposed to the outside of the casing 500 and is made of an adjustment screw 465. When the adjusting screw 465 is tightened, the adjusting shaft 460 in contact with the adjusting screw 465 and the spring seat 440 connected with the adjusting shaft 460 are also lowered together. On the contrary, as the adjusting screw 465 is released, the spring seat 440 is raised upward. By tightening or bearing the adjustment screw 465 in this manner, the position of the spring seat 440 is adjusted, thereby adjusting the biasing force of the spring 450 acting on the top plate 470.

The lower housing 414 includes a groundwater inlet 422 for communicating with groundwater guiding means, ie, an extension pipe 136 or a horizontal connecting pipe 218, and a groundwater outlet 424 for discharging groundwater to the sump.

The lower plate 472 is in contact with the surface opposite to the surface in contact with the upper plate 470 of the diaphragm 430. Holes are formed in the centers of the diaphragm 430, the upper plate 470, and the lower plate 472, respectively. The upper end of the valve shaft 480 is formed with an extension 486 having a diameter smaller than the other portion and having a thread. The extension part 486 is fastened to the bolt 495 in the state which penetrated the hole of the lower plate 472, the diaphragm 430, and the upper plate 470. The valve 481 is connected to the lower end of the valve shaft 480. In another embodiment, the valve 481 may be integrally coupled with the top plate 470 via the valve shaft 480.

Referring to FIG. 6, one or more protrusions 435 are formed on the upper and lower surfaces of the diaphragm 430 to form concentric circles with the diaphragm 430 around the central hole. Since the biasing force of the spring 450 applied to the upper plate 470 is transmitted to the lower plate 472 wider than the cross section of the valve shaft 480, the biasing force acting on the diaphragm 430 is dispersed, and the protrusion 435 is provided. Increases the sealing pressure in the diaphragm central hole region to further enhance watertightness.

The valve 481 consists of a valve plate 484 covering the groundwater outlet 424 and a valve plate holder 482 holding the valve plate 484. Guide pins 498 extend downward from the center of the valve. The guide pin 498 is threaded at one end thereof. On the other hand, there is a hole in the center of each of the valve plate 484, the valve plate holder 482, and a threaded hole in the center of the lower end of the valve shaft 480. They are integrally coupled to each other by the threaded portion of the guide pin 498 being fastened to the hole in the lower end of the valve shaft 480. The other end of the guide pin 498 protrudes below the valve plate 484.

The valve seat surface 492 provides a seating surface of the valve plate 484 at the groundwater outlet 424 of the lower housing 414 to allow the valve plate 484 to seal the second space with respect to the outlet 424. And guide hole ribs 485 for providing a guide hole 488 for guiding the vertical movement of the guide pin 498. Accordingly, as the upper plate 470 moves up and down together with the diaphragm 430, the valve 481 connected to the upper plate 470 via the valve shaft 480 can be accurately and stably guided in the up and down direction. have.

The valve device 400 can include a pressure gauge 510. The pressure gauge 510 is preferably installed such that the pressure indicator is visible outside the casing 500 of the valve device 400. The pressure gauge 510 may be connected to the lower housing 414 and the flow path 520 to measure the water pressure in the second space. The pressure gauge 510 may be usefully used when installing or checking the valve device 400. By the adjustment screw 465 such that the biasing force exerted on the upper plate 470 by the spring 450 at the time of installation of the valve device 400 is equal to the force acting by the diaphragm 430 by reference water pressure. The position of the spring seat 440 is adjusted. At this time, the installer tightens the adjusting screw 465 when the water pressure in the second space indicated on the pressure gauge 510 is lower than the reference water pressure when water inside the second space begins to flow out through the groundwater outlet 424. Increasing the biasing force applied to the plate 470 and, when higher than the reference water pressure, loosens the adjusting screw 465 to reduce the biasing force by the spring 450 so that the valve can be opened when the groundwater reaches the reference level. I can regulate it.

As such, the adjusted valve device 400 may not reach the reference hydraulic pressure of the groundwater introduced from the extension pipe 136 or the horizontal connecting pipe 218 through the groundwater inlet 422 of the lower housing 414 in the second space. If not, the valve plate 484 is pushed down by the upper plate 470 to form a seal against the valve seat surface 492 so that groundwater does not flow out of the groundwater outlet 424. On the other hand, when the positive pressure of the groundwater acting in the second space exceeds the reference hydraulic pressure, the lifting force by the hydraulic pressure acting on the diaphragm 430 exceeds the biasing force by the spring acting on the upper plate 470. The upper plate 470 is to be lifted up. Accordingly, the valve 481 connected to the upper plate 470 and the valve shaft 480 is also raised to open the groundwater outlet 424. Therefore, the groundwater is discharged to the outside through the groundwater outlet 424 through the second space, and is collected in the sump 228.

When the groundwater pressure in the second space becomes lower than the standard water pressure as the groundwater around the building is discharged, the force that the spring 450 pushes the upper plate 470 downward is caused by the groundwater pressure in the second space. Since the diaphragm 430 becomes larger than the force for raising, the upper plate 470 descends again and the valve 481 closes the groundwater outlet 424.

According to the configuration of the mechanical valve, it is possible to stably adjust the groundwater level around the building without a separate sensor or electric device. In addition, since the mechanical valve is simple in structure and has fewer moving parts, the possibility of failure in use is very small. In addition, by using the diaphragm, it is possible to precisely and quickly react to small changes in the positive pressure of the groundwater to discharge the groundwater exceeding the reference level to the outside. While the present invention has been described with reference to examples, the present invention may be embodied in other forms as well. However, such changes are, of course, within the scope of the present invention.

1 is a side cross-sectional schematic view of a conventional drainage system.

Figure 2 is a side cross-sectional schematic diagram of the groundwater drainage structure according to an embodiment of the present invention.

Figure 3 shows an embodiment of the perforated tube and its periphery of the drainage structure of the present invention.

Figure 4 is a side cross-sectional schematic view of the groundwater drainage structure according to another embodiment of the present invention.

Figure 5 shows a side sectional view of a valve arrangement used in the drainage structure of the present invention.

6 is an enlarged view of a diaphragm of a valve device used in the drainage structure of the present invention.

Claims (22)

delete delete delete delete delete delete delete delete delete delete delete delete delete In the groundwater drainage structure to minimize the risk factors of the building by buoyancy of the groundwater, Home Fertilization, Means located in the lower part of the building foundation and groundwater flows in; Groundwater guide means having an outlet formed in the sump and providing groundwater flow passages between the groundwater inflow means and the sump; And a valve means installed adjacent to the outlet of the groundwater guide means and opened when the groundwater pressure is equal to or greater than the reference pressure. The reference pressure is the pressure corresponding to the design stability level of the building, The valve means is a mechanical valve device that is closed if the groundwater pressure is less than the reference water pressure, A housing having a groundwater inlet and an groundwater outlet, A diaphragm dividing the inside of the housing into a first space and a second space communicating with the inlet and the outlet; An upper plate for tightly supporting the diaphragm in the first space; A spring disposed in a compressed state with respect to the upper plate to act as a biasing force for pressing the upper plate in the second space direction; And a valve located in the second space and connected to the upper plate to open and close the outlet by the movement of the upper plate. 15. The groundwater drainage structure of claim 14 wherein said valve means comprises means for adjusting said biasing force. The spring of claim 15, wherein an end opposite to the upper plate is connected to a spring seat, and the biasing means adjusts one end of the spring seat to move the spring seat to adjust the compression length of the spring. Groundwater drainage structure wherein the adjustment screw is exposed outside the housing. 15. The groundwater drainage structure of claim 14 wherein the valve includes a valve plate and at the inlet of the outlet port a valve seat surface is formed to allow the valve plate to seat and form a seal. 18. The groundwater drainage structure of claim 17 wherein the valve is integrally coupled with the top plate via a valve shaft. 19. The groundwater drainage structure of claim 18, wherein the valve further comprises a guide pin and the housing further comprises a guide hole located in the outlet and for guiding movement of the guide pin of the valve.  15. The groundwater drainage structure of claim 14 wherein the valve device further comprises a bottom plate for tightly supporting the diaphragm in the second space. 21. The groundwater drainage structure of claim 20 wherein the diaphragm further comprises one or more protrusions concentric with the diaphragm on the first space side, wherein the protrusions abut the upper plate. 21. The groundwater drainage structure of claim 20 wherein the diaphragm further comprises one or more protrusions concentric with the diaphragm on a second space side surface, wherein the protrusion contacts the bottom plate.

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