A groundwater drainage device for underground building facilities
By installing drainage pipes and filter layers in underground buildings, the problem of structural damage and high operation and maintenance costs caused by groundwater seepage is solved, and the effective diversion and depressurization of groundwater is achieved, ensuring the normal operation of the facilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU JIAOTONG UNIV ENG CONSTR GRP REINFORCEMENT TECH RES CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-26
AI Technical Summary
Groundwater seepage beneath the concrete layers of underground buildings can cause structural damage, affect operation and use, and increase maintenance costs. Existing cleaning methods are inefficient and incomplete.
Drainage pipes are installed in the concrete layer, with one end entering the soil layer and the other end connecting to the sewer. Through the water passage and filter layer, a groundwater drainage channel is formed to realize the diversion and depressurization of groundwater.
It effectively avoids water accumulation affecting daily operation, reduces water pressure under the concrete layer, prevents cracking and instability, reduces structural damage, and lowers operation and maintenance costs.
Smart Images
Figure CN224281501U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of groundwater drainage and pressure relief technology, and in particular to a groundwater drainage device for underground building facilities. Background Technology
[0002] For underground structures such as underground parking garages, concrete slabs are poured to separate the underground soil and rock layers from the garage's interior space. However, the soil and rock layers beneath these slabs often contain groundwater. Once the underground parking garage is completed and put into use, the groundwater in these layers accumulates, increasing the water pressure on the concrete. Excessive pressure can cause the concrete to become unstable and crack, allowing groundwater to seep into the space above the concrete, i.e., the garage's interior. Over time, this seepage can cause water accumulation on the garage floor, disrupting its daily operation. Currently, staff can only periodically clean the water, and in severe cases, additional pumping equipment is needed to remove it, increasing daily maintenance costs and workload. Furthermore, the prolonged exposure to high water pressure can further damage the structure and create more safety hazards. To address these issues, an effective drainage method is urgently needed to depressurize and divert the groundwater. Utility Model Content
[0003] The purpose of this utility model is to overcome the technical problems of groundwater seepage under the concrete layer of underground garages and other building facilities, which causes structural damage, affects the use and operation of buildings, and increases the operation and maintenance costs of manual water cleaning. The present invention provides a groundwater drainage device for underground building facilities.
[0004] This utility model provides a groundwater drainage device for underground building facilities, including a first drainage pipe and a second drainage pipe connected to each other. The first drainage pipe can pass through a concrete layer from top to bottom and extend into the soil layer below the concrete layer. The second drainage pipe is connected above the first drainage pipe, and the outlet end of the second drainage pipe is connected to the sewer of the underground building facility. A water passage hole is opened on the side wall of the first drainage pipe extending into the soil layer. A first annular space gap is formed between the pipe wall of the first drainage pipe with the water passage hole and the circumferential soil layer. The first annular space gap is filled with a first filter layer. A filter section is provided between the first drainage pipe and the second drainage pipe.
[0005] This invention establishes a drainage channel for groundwater by installing drainage pipes within the concrete layer of underground structures (such as underground parking garages). One end of the drainage pipe enters the soil layer below the concrete layer, while the other end is positioned above the concrete layer and connected to the sewer system. Groundwater in the soil layer can enter the first drainage pipe through a water passage hole, and under pressure, it can flow upward through the concrete layer into the upper second drainage pipe. From there, it can be discharged into the sewer system of the underground structure. This design effectively drains and depressurizes groundwater. By establishing a dedicated drainage channel within the concrete layer, groundwater can be diverted and discharged centrally, preventing seepage and water accumulation in the underground parking garage that is difficult to clean and disrupts daily operations. Furthermore, it reduces the pressure of the groundwater below the concrete layer, preventing excessive pressure from causing cracking and instability in the concrete layer, thus avoiding structural damage.
[0006] The outer side of the pipe wall at the lower end of the first drainage pipe, where a water passage hole is located, is the first annular space. This space can be filled with a first filter layer to filter groundwater from the soil and rock layer. Groundwater in the soil and rock layer usually carries solid media such as sand and gravel. When it enters the drainage pipe through the water passage hole, these solid particles may clog the hole, reducing the water flow efficiency. To prevent solid particles in the groundwater from entering the water passage hole, the first filter layer outside the water passage hole can be used to filter the groundwater. Here, the first filter layer may include first stones with a particle size between 10mm and 25mm. By filling the first annular space with multiple first stones, groundwater can enter the water passage hole through the gaps between the first stones. However, solid media such as sand and gravel larger than the gaps between the first stones cannot pass through and are blocked from entering the drainage pipe.
[0007] The filter section can be connected between the two drainage pipes in a detachable manner, for example, through a flange connection. The filter section is equivalent to the third-stage filter layer after the first and second filter layers. After passing through the first and second filter layers, the groundwater can enter the drainage pipe, go up along the first drainage pipe, undergo the third-stage filtration when passing through the filter section, and then continue to go up and be discharged through the first drainage pipe.
[0008] Preferably, a filter screen is provided between the first filter layer and the wall of the first drain pipe.
[0009] If the first stone in the first filter layer has a large particle size or poor filtration effect, a filter screen can be added between the first filter layer and the wall of the drain pipe. The filter screen can cover the outside of the water passage hole. The pore size of the filter screen can be slightly smaller than the gap between the first stone in the first filter layer. For some solid particles that the first filter layer cannot filter, the filter screen can be used for filtration. After a period of use, when the solid matter accumulated on the filter screen increases and affects the water flow efficiency, the drain pipe can be removed and the filter screen can be disassembled and replaced.
[0010] Preferably, a plurality of filter strips are attached to the inner wall of the first drain pipe where the water passage hole is provided, along the axial direction of the first drain pipe, and the plurality of filter strips are arranged along the circumference of the first drain pipe.
[0011] Preferably, a second annular space is formed between the pipe wall of the first drain pipe without the water passage and the circumferential concrete layer, the second annular space is connected to the first annular space, and the second annular space is filled with a second filter layer.
[0012] The second annular space above the first filter layer can be filled with a second filter layer to enhance filtration performance. The second filter layer can include a second stone with a particle size smaller than the first stone, for example, the particle size of the second stone is in the range of 7mm to 15mm. On the one hand, filling the second stone into the second annular space above the first stone can fix the first drainage pipe in the middle, preventing the drainage pipe from shifting and becoming eccentric under uneven pressure. On the other hand, when the groundwater pressure is high, some groundwater will pass through the first filter layer and enter the second filter layer, and then flow back down through the water passage into the drainage pipe. Therefore, the second filter layer can perform secondary filtration of groundwater and improve filtration performance.
[0013] Preferably, the first filter layer includes a plurality of first stones, and the second filter layer includes a plurality of second stones, wherein the particle size of the second stones is smaller than that of the first stones.
[0014] Preferably, a sealing material is provided at the upper opening of the second annular space gap for sealing.
[0015] To prevent groundwater from overflowing into the concrete layer along the first and second filter layers, sealing materials can be used to seal the upper opening of the second annular space. Here, the sealing material can be a water-based epoxy mortar or other leak-stopping and waterproofing materials.
[0016] Preferably, the filter section includes a first filter plate and a second filter plate spaced apart along the axial direction of the first drain pipe, both the first filter plate and the second filter plate having a plurality of filter holes, and a third filter layer filling the space between the first filter plate and the second filter plate.
[0017] The first filter plate is equivalent to the bottom plate of the filter section, and the second filter plate is equivalent to the top plate of the filter section. The first and second filter plates can be connected by a partition pipe to form an independent accommodating space. A third filter layer is filled in the partition pipe for third-stage filtration of groundwater. The material of the third filter layer can be fibrous materials such as wire mesh or cotton and linen, or it can be crushed stone material with a smaller particle size. However, it should be noted that the material of the third filter layer should be prevented from leaking out along the filter holes opened on the first and second filter plates. For example, when crushed stone material is used for the third filter layer, the pore size should be smaller than the particle size of the crushed stone material.
[0018] Preferably, the second drain pipe includes a straight pipe and a bend that are connected together. The upper end of the straight pipe is closed, the bend is connected to the side wall of the straight pipe, and the outlet of the bend faces downward and is connected to the sewer of the underground building facility.
[0019] Preferably, the bend is equipped with a drain valve.
[0020] As the pressurized groundwater is transported upwards along the first and second drainage pipes, it can buffer the flow at the closed end of the straight pipe, reducing the flow velocity. Then, it enters the bend from the side wall of the straight pipe and flows downwards through the outlet of the bend into the sewer for discharge. A drain valve can be installed on the bend, and the opening and closing of the drain valve can control whether the groundwater is discharged. During normal discharge operations, the drain valve can be kept open to keep the water flowing in the pipe. If pipe repair or replacement of filter material is required, the drain valve needs to be closed to stop the drainage operation. If necessary, the pipe can be removed from the concrete layer for repairs and other operations.
[0021] Preferably, a plurality of support rods are arranged circumferentially on the outer wall of the first drain pipe.
[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0023] This invention provides a groundwater drainage device for underground building facilities. By installing a drainage pipe in the concrete layer of the underground building facility (such as an underground garage), one end of the drainage pipe enters the soil layer below the concrete layer, while the other end of the drainage pipe is located above the concrete layer and connected to the sewer. This establishes a drainage channel for groundwater. Groundwater in the soil layer can enter the first drainage pipe through a water passage hole. Under pressure, it can flow upward through the concrete layer and enter the second drainage pipe above, and then be discharged into the sewer of the underground building facility. This device can drain and depressurize groundwater. By establishing a dedicated drainage channel in the concrete layer, groundwater can be diverted and discharged centrally, preventing seepage and water accumulation in the underground garage that is difficult to clean and affects daily operation. On the other hand, it can reduce the pressure of groundwater below the concrete layer, preventing excessive pressure from causing cracking and instability in the concrete layer, thus avoiding damage to the concrete structure. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the groundwater drainage device for underground building facilities according to the present invention (filter layer not shown).
[0025] Figure 2 This is a schematic diagram of the groundwater drainage device for underground building facilities according to the present invention (showing the filter layer).
[0026] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.
[0027] Figure 4 This is a schematic diagram of the groundwater drainage device for underground building facilities according to the present invention (the drainage valve is located below the filter section).
[0028] Marked in the image:
[0029] 1. First drain pipe; 11. Water passage hole; 2. Second drain pipe; 21. Straight pipe; 22. Bend pipe; 23. Drain valve; 3. Concrete layer; 4. Soil layer; 5. Filter section; 51. First filter plate; 52. Second filter plate; 53. Third filter layer; 54. Filter hole; 55. Isolation pipe; 6. Mounting hole; 61. First annular space gap; 611. First filter layer; 62. Second annular space gap; 621. Second filter layer; 7. Sealing material. Detailed Implementation
[0030] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0031] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0032] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0033] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0034] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0035] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0036] Example
[0037] This embodiment provides a groundwater drainage device for underground building facilities.
[0038] Figure 1 This is a schematic diagram of the groundwater drainage device for underground building facilities according to the present invention (filter layer not shown). Figure 2 This is a schematic diagram of the groundwater drainage device for underground building facilities according to the present invention (showing the filter layer). Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the groundwater drainage device for underground building facilities according to the present invention (the drainage valve is located below the filter section).
[0039] like Figures 1 to 4 As shown in the figure, the groundwater drainage device for underground building facilities described in this embodiment may include a first drainage pipe 1 and a second drainage pipe 2 connected to each other. The first drainage pipe 1 can pass through the concrete layer 3 from top to bottom and extend into the soil layer 4 below the concrete layer 3. The second drainage pipe 2 is connected above the first drainage pipe 1, and the outlet end of the second drainage pipe 2 is connected to the sewer of the underground building facility. A water passage hole 11 is opened on the side wall of the first drainage pipe 1 that extends into the soil layer 4. Groundwater in the soil layer 4 can enter the first drainage pipe 1 and the second drainage pipe 2 through the water passage hole 11 for drainage and pressure relief. Here, there can be multiple water passage holes 11 opened on the first drainage pipe 1. Multiple water passage holes 11 are arranged on the pipe wall to connect the inner and outer sides of the first drainage pipe 1.
[0040] This invention establishes a drainage channel for groundwater by installing a drainage pipe in the concrete layer 3 of an underground building facility (such as an underground garage). One end of the drainage pipe enters the soil layer 4 below the concrete layer 3, while the other end is located above the concrete layer 3 and connected to the sewer. Groundwater in the soil layer 4 can enter the first drainage pipe 1 through the water passage 11. Under pressure, it can flow upward through the concrete layer 3 and enter the second drainage pipe 2 above. It can then be discharged into the sewer of the underground building facility through the second drainage pipe 2, thus realizing the function of draining and depressurizing groundwater. By establishing a dedicated drainage channel in the concrete layer 3, groundwater can be diverted and discharged in a centralized manner, preventing seepage and water accumulation in the underground garage that is difficult to clean and affects daily operation. On the other hand, it can reduce the pressure of the groundwater below the concrete layer 3, preventing excessive pressure from causing cracking and instability in the concrete layer 3, thereby avoiding damage to the structure of the concrete layer 3.
[0041] In this embodiment, a first annular space 61 is formed between the pipe wall of the first drainage pipe 1 with the water passage hole 11 and the circumferential soil layer 4. The first annular space 61 is filled with a first filter layer 611. The outer side of the pipe wall with the water passage hole 11 at the lower end of the first drainage pipe 1, that is, the first annular space 61, can be filled with the first filter layer 611 to filter the groundwater in the soil layer 4. Usually, the groundwater in the soil layer 4 carries solid media such as sand and gravel. When the groundwater enters the drainage pipe through the water passage hole 11, the solid particles such as sand and gravel may block the water passage hole 1. 1. This leads to a decrease in water flow efficiency. To prevent solid particles in the groundwater from entering the water flow hole 11, the groundwater can be filtered by the first filter layer 611 outside the water flow hole 11. Here, the first filter layer 611 may include first stones with a particle size between 10mm and 25mm. Multiple first stones are filled in the first annular space gap 61. Groundwater can enter the water flow hole 11 through the gaps between the first stones. Solid media such as sand and gravel with a size larger than the gaps between the first stones cannot pass through and can be blocked outside the water flow hole 11 and cannot enter the drainage pipe.
[0042] Optionally, a filter screen (not shown in the figure) is provided between the first filter layer 611 and the wall of the first drain pipe 1. If the first stone particle size of the selected first filter layer 611 is large or the filtration effect is poor, a filter screen can be added between the first filter layer 611 and the wall of the drain pipe, covering the outside of the water passage hole 11. The pore size of the filter screen can be slightly smaller than the gap between the first stones of the first filter layer 611. For some solid particles that the first filter layer 611 cannot filter, the filter screen can be used for filtration. After a period of use, when the solid matter accumulated on the filter screen increases and affects the water flow efficiency, the drain pipe can be removed and the filter screen can be disassembled and replaced.
[0043] Of course, filter material (not shown in the figure) can also be detachably installed in the first drain pipe 1. For example, filter cotton can be installed in the first drain pipe 1. The filter cotton can be strip-shaped to form filter strips. The filter strips can be attached to the inner wall of the first drain pipe 1 longitudinally. Multiple filter strips can be arranged circumferentially on the inner wall of the first drain pipe 1. When the filter strips reach a certain service life, they can be removed from the first drain pipe 1 and replaced.
[0044] In this embodiment, a second annular space gap 62 is formed between the pipe wall of the first drainage pipe 1 without water passage holes 11 and the circumferential concrete layer 3. The second annular space gap 62 is connected to the first annular space gap 61, and a second filter layer 621 is filled in the second annular space gap 62 above the first filter layer 611. The second filter layer 621 can be filled in the second annular space gap 62 above the first filter layer 611 to enhance the filtration performance. The second filter layer 621 can include a second stone with a particle size smaller than the first stone, for example, the particle size range of the second stone is 7mm~15mm. On the one hand, filling the second stone in the second annular space gap 62 above the first stone can fix the first drainage pipe 1 in the middle and prevent the drainage pipe from shifting and becoming eccentric under uneven pressure. On the other hand, when the groundwater pressure is high, some groundwater will pass through the first filter layer 611 and enter the second filter layer 621 upwards, and then flow back downwards through the water passage holes 11 into the drainage pipe. Therefore, the second filter layer 621 can perform secondary filtration of groundwater and improve the filtration performance.
[0045] In this embodiment, a sealing material 7 is used to seal the upper opening of the second annular space gap 62. In order to prevent groundwater from overflowing into the concrete layer 3 along the first filter layer 611 and the second filter layer 621, the sealing material 7 can be used to seal the upper opening of the second annular space gap 62. Here, the sealing material 7 can be a water-based epoxy mortar or other leak-stopping and waterproofing material.
[0046] In this embodiment, a filter section 5 is provided between the first drain pipe 1 and the second drain pipe 2. The filter section 5 can be connected between the two drain pipes in a detachable manner, for example, by a flange connection. The filter section 5 is equivalent to the third-level filter layer after the first filter layer 611 and the second filter layer 621. After passing through the first filter layer 611 and the second filter layer 621, the groundwater can enter the drain pipe, go up along the first drain pipe 1, undergo the third-level filtration when passing through the filter section 5, and then continue to go up and be discharged through the first drain pipe 1.
[0047] Optionally, the filter section 5 includes a first filter plate 51 and a second filter plate 52 spaced apart along the axial direction of the first drain pipe 1. Both the first filter plate 51 and the second filter plate 52 have a plurality of filter holes 54. A third filter layer 53 is filled between the first filter plate 51 and the second filter plate 52. The first filter plate 51 is equivalent to the bottom plate of the filter section 5, and the second filter plate 52 is equivalent to the top plate of the filter section 5. The first filter plate 51 and the second filter plate 52 can be connected by a partition pipe 55 to form an independent accommodating space. The third filter layer 53 is filled in the partition pipe 55 for third-stage filtration of groundwater. The material of the third filter layer 53 can be fibrous materials such as wire mesh or cotton and linen, or it can be selected as crushed stone material with a smaller particle size. However, it should be noted that the material of the third filter layer 53 should be prevented from leaking out along the filter holes 54 opened on the first filter plate 51 and the second filter plate 52. For example, when the third filter layer 53 is made of crushed stone material, the pore size of the filter holes 54 should be smaller than the particle size of the crushed stone material.
[0048] Of course, the specific structure of the filter section 5 can also be in other forms. For example, the filter section 5 can be a spherical body that bulges outward along the radial direction of the drain pipe, and the filter material is placed in the sphere. Compared with the filter section 5 whose radial dimension is the same as that of the drain pipe, the bulging spherical structure can hold more filter material, which can meet the requirements of water discharge flow and efficiency while ensuring filtration performance, and will not affect the water delivery speed due to the filter material. This utility model does not make specific limitations on the shape and structure of the filter section 5, as long as it can meet the requirements of filtration and water flow.
[0049] In this embodiment, the second drainage pipe 2 includes a straight pipe 21 and a bend 22 connected together. The upper end of the straight pipe 21 is closed, and the bend 22 is connected to the side wall of the straight pipe 21. The outlet of the bend 22 faces downward and is connected to the sewer of the underground building facility. A drainage valve 23 is provided on the bend 22. Since the groundwater with a certain pressure is transported upward along the first drainage pipe 1 and the second drainage pipe 2, it can buffer the water flow when it reaches the closed end of the upper end of the straight pipe 21, which can reduce the flow velocity of the water. Then it enters the bend 22 from the side wall of the straight pipe 21 and flows downward along the outlet of the bend 22 into the sewer for discharge. A drainage valve 23 can be provided on the bend 22. The opening and closing of the drainage valve 23 can control whether the groundwater is discharged. In normal discharge operations, the drainage valve 23 can be kept open to keep the water flowing in the pipe. If it is necessary to repair the pipe or replace the filter material, the drainage valve 23 needs to be closed to stop the drainage operation. If necessary, the pipe can be removed from the concrete layer 3 for repair and other operations.
[0050] Figure 2 The drain valve 23 shown is positioned on the bend 22. However, the position of the drain valve 23 can be chosen differently depending on actual needs, for example... Figure 4The drain valve 23 shown is located on the first drain pipe 1 below the filter section 5. Setting the drain valve 23 here facilitates later maintenance. This utility model does not limit the specific location of the drain valve 23.
[0051] Optionally, the particle size of the first stone is larger than that of the second stone; this allows the first filter layer 611 and the second filter layer 621 to form a two-stage filtration structure. Combined with the filter section 5 between the first drain pipe 1 and the second drain pipe 2, a three-stage filtration can be formed, maximizing the filtration performance and preventing solid impurities in the soil layer 4 from entering the drain pipe with the groundwater, thus avoiding blockage of the drain pipe.
[0052] Alternatively, multiple support rods (not shown in the figure) can be provided circumferentially on the outer wall of the first drain pipe 1, so that the cantilever end of the support rod abuts against the inner wall of the mounting hole 6. This can ensure that the first drain pipe 1 is fixed in the mounting hole 6 when the drainage device is installed. The multiple support rods are of the same length, which can fix the first drain pipe 1 in the center of the mounting hole 6 and avoid the eccentricity of the drain pipe due to lateral displacement.
[0053] In summary, this utility model establishes a drainage channel for groundwater by installing drainage pipes within the concrete layer of underground building facilities (such as underground parking garages). One end of the drainage pipe enters the soil layer below the concrete layer, while the other end is positioned above the concrete layer and connected to the sewer system. Groundwater in the soil layer can enter the first drainage pipe through a water passage hole, and under pressure, it can flow upward through the concrete layer into the upper second drainage pipe. From there, it can be discharged into the sewer system of the underground building facility. This achieves the function of draining and depressurizing groundwater. By establishing a dedicated drainage channel within the concrete layer, groundwater can be diverted and centrally discharged, preventing seepage and water accumulation in the underground parking garage that is difficult to clean and affects daily operations. Furthermore, it reduces the pressure of the groundwater below the concrete layer, preventing excessive pressure from causing cracking and instability in the concrete layer, thus avoiding structural damage to the concrete layer.
[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A groundwater drainage device for underground building facilities, characterized in that, The system includes a first drain pipe (1) and a second drain pipe (2) that are connected to each other. The first drain pipe (1) can pass through the concrete layer (3) from top to bottom and extend into the soil layer (4) below the concrete layer (3). The second drain pipe (2) is connected above the first drain pipe (1). The outlet end of the second drain pipe (2) is connected to the sewer of the underground building facility. A water passage hole (11) is provided on the side wall of the first drain pipe (1) that extends into the soil layer (4). A first annular space gap (61) is formed between the pipe wall of the first drain pipe (1) with the water passage hole (11) and the circumferential soil layer (4). A first filter layer (611) is filled in the first annular space gap (61). A filter section (5) is provided between the first drain pipe (1) and the second drain pipe (2).
2. The groundwater drainage device for underground building facilities according to claim 1, characterized in that, A filter screen is provided between the first filter layer (611) and the wall of the first drain pipe (1).
3. The groundwater drainage device for underground building facilities according to claim 1, characterized in that, The first drain pipe (1) has a plurality of filter strips attached to the inner wall of the water passage hole (11) along the axial direction of the first drain pipe (1), and the plurality of filter strips are arranged along the circumference of the first drain pipe (1).
4. The groundwater drainage device for underground building facilities according to claim 1, characterized in that, A second annular space gap (62) is formed between the pipe wall of the first drain pipe (1) without the water passage hole (11) and the circumferential concrete layer (3). The second annular space gap (62) is connected to the first annular space gap (61), and the second annular space gap (62) is filled with a second filter layer (621).
5. The groundwater drainage device for underground building facilities according to claim 4, characterized in that, The first filter layer (611) includes a plurality of first stones, and the second filter layer (621) includes a plurality of second stones, wherein the particle size of the second stones is smaller than that of the first stones.
6. The groundwater drainage device for underground building facilities according to claim 4, characterized in that, A sealing material (7) is placed at the upper opening of the second annular space gap (62) for sealing.
7. The groundwater drainage device for underground building facilities according to any one of claims 1 to 6, characterized in that, The filter section (5) includes a first filter plate (51) and a second filter plate (52) arranged axially along the first drain pipe (1). Both the first filter plate (51) and the second filter plate (52) have a plurality of filter holes (54). A third filter layer (53) is filled between the first filter plate (51) and the second filter plate (52).
8. The groundwater drainage device for underground building facilities according to any one of claims 1 to 6, characterized in that, The second drainage pipe (2) includes a straight pipe (21) and a bend (22) connected together. The upper end of the straight pipe (21) is closed, and the bend (22) is connected to the side wall of the straight pipe (21). The outlet of the bend (22) faces downward and is connected to the sewer of the underground building facility.
9. The groundwater drainage device for underground building facilities according to claim 8, characterized in that, A drain valve (23) is provided on the bend (22).
10. The groundwater drainage device for underground structures according to any one of claims 1 to 6, characterized in that, Several support rods are arranged circumferentially on the outer wall of the first drain pipe (1).