CN215857806U - Earth work membrane level prevention of seepage membrane underground spring drainage structures down - Google Patents
Earth work membrane level prevention of seepage membrane underground spring drainage structures down Download PDFInfo
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- CN215857806U CN215857806U CN202121122453.3U CN202121122453U CN215857806U CN 215857806 U CN215857806 U CN 215857806U CN 202121122453 U CN202121122453 U CN 202121122453U CN 215857806 U CN215857806 U CN 215857806U
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- 239000012528 membrane Substances 0.000 title claims abstract description 32
- 230000002265 prevention Effects 0.000 title description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000004576 sand Substances 0.000 claims abstract description 13
- 239000004575 stone Substances 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 239000004567 concrete Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000004746 geotextile Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 2
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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- 238000007569 slipcasting Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a subsurface spring drainage structure under a horizontal anti-seepage membrane of a geotechnical membrane, which comprises spring holes (1) of a subsurface spring; a water collecting well (2) is arranged at the spring hole (1), and reverse filtering and breaking stones (3) are arranged in the water collecting well (2); the periphery of the water collecting well (2) is provided with embedded ditches (4); the bottom of the water collecting well (2) is provided with a drain pipe (9) and a vent pipe (10); an anti-seepage geomembrane (6) is laid in the middle of the embedding ditch (4), and fine sand cushion layers (7) are arranged on the bottom surface and the top surface of the anti-seepage geomembrane (6); a precast block (8) is laid on the top surface of the anti-seepage geomembrane (6). The utility model is a more reasonable drainage structure of the underground spring under the geomembrane horizontal anti-seepage membrane, which can meet the drainage of the underground spring under the geomembrane and ensure the safety of the integral anti-seepage system structure of the geomembrane.
Description
Technical Field
The utility model relates to a lower underground spring drainage structure under a horizontal anti-seepage membrane of a geomembrane, belonging to the technical field of hydraulic and hydroelectric engineering.
Background
In the Yunobuan area, the karst water falling hole has wide development, the problem of reservoir karst needs to be specially treated when the reservoir is designed and constructed in the karst area, otherwise, the problem of reservoir leakage is serious, and the expected benefit cannot be achieved. For the condition that the karst geological condition is complex or the permeability of rock mass in the foundation depth of more than 100m is still larger, when the seepage prevention effect of the curtain is difficult to ensure by adopting the vertical curtain seepage prevention, a horizontal seepage prevention scheme is usually adopted. The horizontal seepage-proofing scheme mainly comprises clay paving seepage-proofing, asphalt concrete seepage-proofing, reinforced concrete panel seepage-proofing and geomembrane seepage-proofing. The geomembrane horizontal seepage-proofing agent has strong adaptability to topographic and geological conditions, convenient construction and simple process, and is widely applied to karst seepage-proofing treatment of small and medium-sized reservoirs. Factors such as reservoir bank slope groundwater, geomembrane infiltration can lead to the geomembrane to bear the infiltration pressure under the membrane, because its protective layer is thinner, take place the top and hold in the palm the destruction phenomenon easily, consequently, the geomembrane bottom needs to set up drainage facility, leads to arrange to the outside of storehouse basin main drainage pipe again through bank slope drain pipe is unified.
For water seepage under a geomembrane membrane, drainage ditches with certain width and thickness formed by broken stones and rock blocks are usually arranged under the geomembrane membrane in engineering, or drainage blind pipes are arranged for drainage, and water seepage under the geomembrane is uniformly guided to a main drainage channel. And when the geomembrane is adopted for horizontal seepage-proofing treatment, the spring holes under the geomembrane must be effectively led and drained, so that the safety of the integral seepage-proofing system of the geomembrane can be effectively ensured. The method can produce a certain plugging effect on the spring eye with small water inflow, but can not completely plug the spring eye with large water inflow, and the underground spring often forms a new leakage channel from the area outside the plugging position to endanger the safety of the geomembrane. If the underground spring under the geomembrane is not subjected to targeted treatment, the underground spring water can repeatedly impact the geomembrane and corresponding auxiliary structures due to the limited drainage capacity of the conventional drainage measures under the geomembrane, so that bank slopes deform and collapse, and finally the geomembrane is pulled and cracked to be damaged. Therefore, the existing technology is still not perfect and needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a drainage structure of an underground spring under a horizontal anti-seepage membrane of a geomembrane, so as to seek a more reasonable drainage structure of the underground spring under the horizontal anti-seepage membrane of the geomembrane, meet the drainage of the underground spring under the geomembrane, ensure the safety of the integral anti-seepage system structure of the geomembrane and overcome the defects in the prior art.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an underground spring drainage structure under a horizontal anti-seepage membrane of a geomembrane comprises spring holes of the underground spring; a water collecting well is arranged at the spring hole, and anti-filtering broken stones are arranged in the water collecting well; the periphery of the water collecting well is provided with embedded ditches; a drain pipe and a vent pipe are arranged at the bottom of the water collecting well; an anti-seepage geomembrane is laid in the middle of the embedding ditch, and fine sand cushion layers are arranged on the bottom surface and the top surface of the anti-seepage geomembrane; the top surface of the anti-seepage geomembrane is laid with precast blocks.
In the drainage structure of the underground spring under the horizontal anti-seepage membrane of the geomembrane, the size and the wall thickness of the water collecting well are determined according to the water yield of the spring hole, the water collecting well is of a reinforced concrete structure, and the strength grade of concrete is not lower than C25; the wall thickness of the water collecting well is not less than 30 cm.
In the underground spring drainage structure under the geomembrane horizontal anti-seepage membrane, the bottom foundation of the water collecting well is embedded into the stable bedrock, a group of foundation joint bars are arranged in the stable bedrock, and the bottom ends of the foundation joint bars extend into the bedrock and are fixed by grouting; and the top end of the foundation dowel bar is welded with the steel bar in the sump structure.
In the underground spring drainage structure under the geomembrane horizontal anti-seepage membrane, the distance between the foundation steel dowels in the group of foundation steel dowels is 1-2 m; the foundation steel bar is a steel bar with the diameter phi of 25 and the length of 3-6 m.
In the drainage structure of the underground spring under the horizontal anti-seepage membrane of the geomembrane, the thickness of the embedding ditch is not less than 50cm, and the embedding ditch and the water collecting well are integrally cast; the embedding groove is of a plain concrete structure, and the strength grade of concrete is not lower than C25.
In the underground spring drainage structure under the horizontal anti-seepage geomembrane, the drainage pipe and the vent pipe are arranged in the ladder-shaped groove at the bottom of the anti-seepage geomembrane.
In the drainage structure of the underground spring under the horizontal anti-seepage membrane of the geomembrane, the drainage pipe is a drainage blind pipe the surface of which is wrapped with geotextile, and the underground spring is drained to the main drainage channel, so that the structural damage of the underground spring junction is avoided; the number and the pipe diameter of the drain pipes are determined according to the spring hole water yield.
In the underground spring drainage structure under the geomembrane horizontal anti-seepage membrane, the vent pipe is a PVC pipe with the pipe diameter of 10-20 cm; the breather pipe is positioned at one end of the water collecting well and extends upwards to a height above the water level through the elbow pipe to be communicated with the outside air.
By adopting the technical scheme, compared with the prior art, the utility model provides the underground spring drainage structure under the horizontal anti-seepage membrane of the geomembrane, aiming at the defects that the drainage capacity of the conventional drainage measure under the geomembrane is limited, the drainage is only suitable for draining a small amount of seepage water under the geomembrane, the underground spring cannot be effectively drained in time, and the underground spring cannot be completely plugged by adopting grouting or concrete plugging measures, so that the underground spring repeatedly impacts the geomembrane to endanger the integral safety of the underground spring. The problem can be solved by carrying out targeted treatment on the underground spring under the geomembrane: enlarging and digging the spring hole of the underground spring to bedrock, arranging a closed water collecting well, and arranging broken stones in the water collecting well to filter the underground spring reversely; the foundation dowel bars are arranged to ensure the stability of the whole structure of the water collecting well; embedding ditches are arranged at the periphery of the water collecting well, and the anti-seepage geomembrane is embedded and fixed in the embedding ditches to ensure the integral anti-seepage effect; the upper part and the lower part of the geomembrane are provided with the fine sand cushion layers, so that the geomembrane is prevented from being damaged by sharp objects during construction, and the prefabricated block weight is arranged at the top of the geomembrane, so that the geomembrane can bear the bank side slope wave pressure and the water flow scouring action; the drainage pipes are arranged at the lower part of the water collecting well, the drainage capacity of the water collecting well can be ensured by adjusting the pipe diameters and the number of the drainage pipes, and the underground spring can be effectively drained in time; the upper part of the water collecting well is provided with a vent pipe which is used for ventilating the inside of the water collecting well, so that the safety of the structure is prevented from being influenced by vacuum suction corrosion formed in the water collecting well.
The structure of the utility model has the following effects:
(1) the closed water collecting well is arranged from the spring hole of the underground spring to the bedrock, the broken stone is arranged in the water collecting well to filter the underground spring reversely to avoid blocking, the bottom of the water collecting well is embedded into the bedrock and provided with the anchor rod, so that the stability of the whole structure of the water collecting well is ensured to adapt to different topographic and geological conditions.
(2) The periphery of the water collecting well is provided with an embedding groove, the peripheral anti-seepage geomembrane is embedded and fixed in the embedding groove, and the water collecting well and the embedding groove are poured simultaneously, so that the integral anti-seepage effect can be ensured.
(3) The upper portion and the lower portion of the geomembrane are provided with the fine sand cushion layers, sharp objects are prevented from damaging the geomembrane during construction, the prefabricated blocks are arranged at the top of the geomembrane, the prefabricated blocks can bear the bank side slope wave pressure and the water flow scouring effect, and the fine sand cushion layers on the geomembrane are prevented from being damaged by water flow brushing.
(4) The drain pipe is arranged at the lower part of the water collecting well, the drainage capacity of the water collecting well can be ensured by adjusting the pipe diameter and the number of the drain pipes, the underground spring is effectively drained to the main drainage channel in time, and the damage of the underground spring to the knot structure is avoided.
(5) The upper part of the water collecting well is provided with the vent pipe, the vent pipe extends to a height above the water level and is communicated with the outside air, so that the inside of the water collecting well can be continuously ventilated, and the phenomenon that the drainage of the underground spring and the safety of the water collecting well structure are influenced due to the vacuum erosion formed in the water collecting well is avoided.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The designations in the figures illustrate the following:
1-spring eye, 2-water collecting well, 3-inverse filtering broken stone, 4-embedded groove, 5-foundation dowel, 6-impermeable geomembrane, 7-fine sand cushion layer, 8-prefabricated block, 9-drainage pipe, 10-ventilation pipe, 11-stable bedrock and 12-ladder-shaped groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
According to the underground spring drainage structure under the horizontal anti-seepage membrane of the geotechnical membrane, as shown in figure 1, a water collecting well 2 is arranged at a spring hole 1, and anti-filtration broken stones 3 are arranged in the water collecting well 2; the periphery of the water collecting well 2 is provided with embedded ditches 4; the bottom of the water collecting well 2 is provided with a drain pipe 9 and a vent pipe 10; an anti-seepage geomembrane 6 is laid in the middle of the embedding ditch 4, and fine sand cushion layers 7 are arranged on the bottom surface and the top surface of the anti-seepage geomembrane 6; a precast block 8 is laid on the top surface of the impermeable geomembrane 6. The size and the wall thickness of the water collecting well 2 are determined according to the water yield of the spring hole 1, the water collecting well 2 is of a reinforced concrete structure, and the strength grade of concrete is not lower than C25; the wall thickness of the water collecting well 2 is not less than 30 cm. The bottom foundation of the water collecting well 2 is embedded into the stable bedrock 11, a group of foundation joint bars 5 are arranged in the stable bedrock 11, and the bottom ends of the foundation joint bars 5 extend into the bedrock and are fixed through grouting; the top end of the foundation dowel bar 5 is welded with the steel bar in the structure of the water collecting well 2. The distance between the basic joint bars 5 in the group of basic joint bars 5 is 1-2 m; the foundation steel bar 5 is a steel bar with the diameter phi of 25 and the length of 3-6 m. The thickness of the embedding ditch 4 is not less than 50cm, and the embedding ditch 4 and the water collecting well 2 are integrally cast; the embedded groove 4 is of a plain concrete structure, and the strength grade of concrete is not lower than C25. The drain pipe 9 and the vent pipe 10 are arranged in a ladder-shaped groove 12 at the bottom of the anti-seepage geomembrane 6. The drainage pipe 9 is a drainage blind pipe with the surface coated with geotextile, and drains the underground spring 1 to the main drainage channel, so that the structure of the underground spring 1 is prevented from being damaged; the number and the pipe diameter of the water discharge pipes 9 are determined according to the water yield of the spring hole 1. The vent pipe 10 is a PVC pipe with the pipe diameter of 10-20 cm; the vent pipe 10 is positioned at one end of the water collecting well 2 and extends upwards to a height above the water level through a bent pipe to be communicated with the outside air.
In specific implementation, as shown in fig. 1. When the reservoir bank and the reservoir basin are excavated and leveled, the hole openings of the periphery of 1 spring hole of the underground spring found by early exploration are expanded and excavated, the foundation needs to be expanded and excavated until the stable bedrock exposes the whole body of the 1 spring hole of the underground spring, and the peripheral expansion and excavation range is not less than 2 m. The water collecting well 2 is arranged in the expanding excavation range of the underground spring 1 spring hole to seal the spring hole integrally, the water collecting well 2 is of a reinforced concrete structure, the wall thickness is not lower than 30cm, the concrete strength grade is not lower than C25, and the structural size and the wall thickness can be adjusted properly according to the expanding excavation range of the underground spring 1 spring hole. Set up anti-broken stone 3 of straining in sump pit 2, prevent that the spring eye from being blockked up by tiny granule, guarantee 1 water outlet channel of underground spring, and anti-broken stone 3 of straining plays the supporting role to 1 roof of sump pit, improves the bearing capacity of sump pit, guarantees the safety of structure. 2 bottom foundations of sump pit imbed firm basement rock to set up basic dowel steel 5, basic dowel steel 5 adopts phi 25 reinforcing bar, length 3 ~ 6m, interval 1 ~ 2m, and the top is firm with 2 structural reinforcement welding of sump pit, and basement rock and slip casting are stretched into to the bottom, guarantee the overall stability of sump pit 2 structure, in order to adapt to different topography geological conditions. The arrangement of the foundation joint bars 5 avoids the water outlet channel of the underground spring 1, and avoids the blockage of the water outlet channel of the underground spring 1 caused by the drilling and grouting construction of the foundation joint bars 5. The periphery of the outer side of the water collecting well 2 is provided with an embedded ditch 4, the embedded ditch 4 is made of plain concrete, the strength grade is consistent with that of the structural concrete of the water collecting well 2, and the water collecting well 2 and the embedded ditch 4 are poured simultaneously to ensure the integral anti-seepage effect. The thickness of the embedding ditch 4 is not less than 50cm, the anti-seepage geomembrane 6 at the periphery of the embedding ditch is embedded and fixed in the embedding ditch, and the depth of the anti-seepage geomembrane 6 embedded in the embedding ditch 4 is not less than 30 cm. Fine sand cushion layers 7 are arranged on the upper portion and the lower portion of the anti-seepage geomembrane 6, the thickness of each fine sand cushion layer is 10-15 cm, and damage to the geomembrane caused by sharp objects during construction is avoided; and the prefabricated block 8 is arranged at the top of the anti-seepage geomembrane 6 and is prefabricated by C20 concrete, the thickness of the prefabricated block is 8-12 cm, the prefabricated block can bear the wave pressure of a bank side slope and the scouring action of water flow, and the fine sand cushion layer 7 on the anti-seepage geomembrane 6 is prevented from being damaged by water flow brushing. The drain pipe 9 is arranged at the lower part of the water collecting well 2, the drain pipe 9 is a drain blind pipe externally coated with geotextile and is arranged at the bottom of the fine sand cushion layer 7 at the lower part of the anti-seepage geomembrane 6, the drainage capacity of the drain pipe 9 can be ensured by adjusting the pipe diameter and the number of the drain pipe 9, the underground spring 1 is effectively drained to a main drainage channel below the anti-seepage geomembrane 6 in time, and the damage of the underground spring 1 to the structure is avoided. The upper portion of the water collecting well 2 is provided with a vent pipe 10, the vent pipe is a PVC pipe, the pipe diameter is 10-20 cm, the vent pipe is arranged at the bottom of a fine sand cushion layer 7 at the lower portion of the anti-seepage geomembrane 6, the vent pipe 10 extends upwards to a height above the water level and is communicated with the outside air, the inside of the water collecting well 2 can be continuously ventilated, and the phenomenon that the drainage of the underground spring 1 and the safety of the structure of the water collecting well 2 are affected due to vacuum absorption formed in the water collecting well 2 is avoided.
Claims (8)
1. An underground spring drainage structure under a horizontal anti-seepage membrane of an earthwork membrane comprises spring holes (1) of the underground spring; the method is characterized in that: a water collecting well (2) is arranged at the spring hole (1), and reverse filtering and breaking stones (3) are arranged in the water collecting well (2); the periphery of the water collecting well (2) is provided with embedded ditches (4); the bottom of the water collecting well (2) is provided with a drain pipe (9) and a vent pipe (10); an anti-seepage geomembrane (6) is laid in the middle of the embedding ditch (4), and fine sand cushion layers (7) are arranged on the bottom surface and the top surface of the anti-seepage geomembrane (6); a precast block (8) is laid on the top surface of the anti-seepage geomembrane (6).
2. The geomembrane-level impervious membrane subsurface drainage structure according to claim 1, wherein: the size and the wall thickness of the water collecting well (2) are determined according to the water yield of the spring hole (1), the water collecting well (2) is of a reinforced concrete structure, and the strength grade of concrete is not lower than C25; the wall thickness of the water collecting well (2) is not less than 30 cm.
3. The geomembrane-level impervious membrane subsurface drainage structure according to claim 1, wherein: the bottom foundation of the water collecting well (2) is embedded into the stable bedrock (11), a group of foundation joint bars (5) are arranged in the stable bedrock (11), and the bottom ends of the foundation joint bars (5) extend into the bedrock to be fixed through grouting; the top end of the foundation dowel bar (5) is welded with the steel bar in the structure of the water collecting well (2).
4. The subsurface spring drainage structure under a geomembrane horizontal impermeable membrane according to claim 3, wherein: the distance between the basic joint bars (5) in the group of basic joint bars (5) is 1-2 m; the foundation steel bar (5) is a steel bar with the diameter phi of 25 and the length of 3-6 m.
5. The geomembrane-level impervious membrane subsurface drainage structure according to claim 1, wherein: the thickness of the embedding groove (4) is not less than 50 cm; the embedding groove (4) is of a plain concrete structure, and the strength grade of concrete is not lower than C25.
6. The geomembrane-level impervious membrane subsurface drainage structure according to claim 1, wherein: the drain pipe (9) and the vent pipe (10) are arranged in a trapezoidal groove (12) at the bottom of the anti-seepage geomembrane (6).
7. The geomembrane-level impervious membrane subsurface drainage structure according to claim 1, wherein: the drainage pipe (9) is a drainage blind pipe with the surface wrapped by geotextile; the number and the pipe diameter of the drain pipes (9) are determined according to the water yield of the spring holes (1).
8. The geomembrane-level impervious membrane subsurface drainage structure according to claim 1, wherein: the vent pipe (10) is a PVC pipe with the pipe diameter of 10-20 cm; the vent pipe (10) is positioned at one end of the water collecting well (2) and extends upwards to a height above the water level through a bent pipe to be communicated with the outside air.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121122453.3U CN215857806U (en) | 2021-05-24 | 2021-05-24 | Earth work membrane level prevention of seepage membrane underground spring drainage structures down |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121122453.3U CN215857806U (en) | 2021-05-24 | 2021-05-24 | Earth work membrane level prevention of seepage membrane underground spring drainage structures down |
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| CN215857806U true CN215857806U (en) | 2022-02-18 |
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| CN202121122453.3U Active CN215857806U (en) | 2021-05-24 | 2021-05-24 | Earth work membrane level prevention of seepage membrane underground spring drainage structures down |
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