CN115387284A - Under-film drainage pressure reduction structure suitable for reservoir plate of reservoir in coastal region and application method - Google Patents
Under-film drainage pressure reduction structure suitable for reservoir plate of reservoir in coastal region and application method Download PDFInfo
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- CN115387284A CN115387284A CN202210968131.3A CN202210968131A CN115387284A CN 115387284 A CN115387284 A CN 115387284A CN 202210968131 A CN202210968131 A CN 202210968131A CN 115387284 A CN115387284 A CN 115387284A
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- 210000003462 vein Anatomy 0.000 claims abstract description 47
- 239000012528 membrane Substances 0.000 claims abstract description 32
- 238000005086 pumping Methods 0.000 claims abstract description 28
- 238000007667 floating Methods 0.000 claims abstract description 6
- 239000002362 mulch Substances 0.000 claims abstract 11
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- 238000012544 monitoring process Methods 0.000 claims description 20
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- 239000004746 geotextile Substances 0.000 claims description 13
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- 239000003657 drainage water Substances 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/121—Devices for applying linings on banks or the water bottom
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
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Abstract
A under-mulch drainage pressure-reducing structure suitable for a reservoir plate of a reservoir in a coastal region comprises an under-mulch air guide and drainage structure, a water collecting tank and a pumping and drainage system; the water collecting tank is a water storage structure which is arranged outside the reservoir and connected with the under-membrane air guide and drainage structure; the pumping and draining system is arranged on the water collecting tank, and the air guide and drainage structure under the membrane is arranged in a vein shape. The vein-like arrangement mode is as follows: the air guide and drainage structure under the membrane comprises blind ditches of all stages which are gradually expanded from the upper stage to the lower stage. The invention also discloses an application method of the composition. The under-membrane blind ditch is characterized by absorbing veins, the size of the cross section of the under-membrane drainage pressure reduction blind ditch is coordinated with the overflowing amount, and the arrangement mode has better economy; the invention can solve the problem of the inflatable damage of the impermeable geomembrane of the reservoir tray caused by the accumulation of pore gas under the membrane or the problem of the floating damage of the membrane body caused by the lifting of underground water; meanwhile, the defect of drainage and pressure reduction by adopting a check valve is overcome.
Description
Technical Field
The invention belongs to the field of reservoir seepage prevention, and relates to a under-film drainage pressure reduction structure suitable for a reservoir plate of a reservoir in a coastal region.
Background
Most of the coastal areas are saline soil with low-lying terrain, and most of the underground water is saline water with shallow buried depth. Therefore, when a reservoir is built in the region, a geomembrane anti-seepage structure is generally required to be arranged, on one hand, the seepage loss of the reservoir water body is prevented, and on the other hand, the aim of preventing salt in the underground saline water and the saline soil from permeating the water body to pollute the fresh water resources in the reservoir is more important.
The problem that current arrangement geomembrane seepage prevention structure exists is: after the geomembrane anti-seepage body is laid, if the underground water level rises, pore gas in an unsaturated soil body is replaced and extruded to the lower part of the geomembrane by a water body, so that the air inflation phenomenon is caused; if the groundwater level continues to rise until the buoyancy is greater than the ballast on the membrane, membrane buoyancy damage can occur. To solve the problems of air inflation and floating, it is the most effective way to install a reliable drainage and venting facility under the membrane. The common drainage and pressure reduction technology is that criss-cross blind ditches are arranged under the membrane to form a communication channel between gas in soil and water, and then drainage and pressure reduction are carried out under the membrane through check valves arranged at intervals. However, this criss-cross arrangement of blind grooves is not the most economical arrangement. The drainage and pressure reduction of the check valve are adopted, and simultaneously, the saline water underground in the coastal region is discharged into the reservoir area, so that the fresh water resource is polluted. In practice, the position of the check valve is always broken or damaged, so that water body leakage is caused, and the check valve is preferably avoided to be used for drainage and pressure reduction as much as possible in engineering.
Disclosure of Invention
The invention aims to provide a practical and reliable under-film drainage pressure reduction structure suitable for a reservoir plate of a reservoir in a coastal region and an application method thereof.
The invention realizes the aim through the following technical scheme:
a under-film drainage pressure-reducing structure suitable for a reservoir plate of a reservoir in a coastal region comprises an under-film air-guiding and drainage structure, a water collecting tank and a pumping drainage system; the water collecting pool is a water storage structure which is arranged outside the reservoir and connected with the under-membrane air guide and drainage structure; the pumping and draining system is arranged on the water collecting tank, and the air guide and drainage structure under the membrane is arranged in a vein shape.
Further, the vein-like arrangement means that: the inferior membrane air guide drainage structures include from higher level to subordinate, each grade of french drain that expandes step by step, including "main arteries" french drain, "inferior arteries" french drain and "branching arteries" french drain, "main arteries" french drain is that communicate each "secondary arteries" french drain with the air guide drainage trunk of catch basin, "secondary arteries" french drain is that communicate each "branching arteries" french drain and the french drain of "main arteries" french drain, "branching arteries" french drain is terminal air guide drainage french drain, "branching arteries" french drain with "secondary arteries" french drain intercommunication.
Optionally, the 'main vein' blind ditches are arranged on an approximate central axis of the reservoir, divide the reservoir into two parts with approximately equal areas, and are arranged along the long axis direction; and/or the presence of a gas in the atmosphere,
two areas divided by the 'main pulse' blind ditches are respectively divided into a plurality of sub-areas with approximately equivalent areas, the 'secondary pulse' blind ditches are respectively arranged on approximate central axes of the sub-areas, and the 'secondary pulse' blind ditches are responsible for drainage and pressure reduction tasks of the areas; and/or the presence of a gas in the atmosphere,
arranging branch vein blind ditches extending towards the periphery, and distributing the drainage or gas range in the whole subarea through the influence radius of the branch vein blind ditches; and/or the presence of a gas in the gas,
subordinate culverts are added on the branch vein culverts step by step.
Optionally, the cross-sectional size of each stage of blind drain is determined by a water passing cross-section required by the cross-sectional overflow, and the larger the discharge range is, the larger the cross-sectional overflow is, the larger the size of the cross-sectional area of the blind drain is, and the larger the size of the blind drain closer to the water collecting tank on one path is.
Optionally, the blind trench is provided with a longitudinal slope and the increased cross-sectional area portion is used to create a longitudinal slope to reduce the amount of earth excavation.
Optionally, an angle between a direction in which the blind ditch of the next stage extends and a direction in which the blind ditch of the previous stage extends is 45 ° to 90 °.
Optionally, the catchment tank is a water storage structure arranged outside the bottom sideline of the reservoir, having a barrier setting to reduce or avoid groundwater infiltration; and/or the presence of a gas in the gas,
the arrangement of the water collecting tank is close to a reservoir area, close to a municipal drainage pipeline or a drainage channel, and the water collecting tank is good in geological condition, convenient to transport, in line with local planning and small in influence on the surrounding environment; and/or the presence of a gas in the gas,
the water collecting tank is a structural body meeting the requirements of strength, rigidity and stability, and the volume of the water collecting tank corresponds to the water discharge amount under the membrane; and/or the presence of a gas in the atmosphere,
the water collecting tank is switched into a solid-wall pipe within the range of 2-10 m so as to realize the reliable connection between the 'main vein' blind drain and the water collecting tank, and the solid-wall pipe is tightly connected with the tank wall of the water collecting tank so as to avoid water seepage at the joint.
Optionally, the blind ditch is a PVC pipe with holes perforated around the medium coarse sand and the outer geotextile, or a quick-release pipe of the medium coarse sand and the outer geotextile, or gravels of the outer geotextile.
Optionally, the pumping and draining system comprises an automatic control terminal, a liquid level monitoring system, a water pump and an alarm, which are arranged on the water collecting tank and are mutually connected and matched.
Optionally, the alarm comprises a fixed alarm arranged in a duty room or an office where a worker is located, and a portable alarm carried by the worker; and/or the presence of a gas in the gas,
the portable alarm carried with the person is a mobile phone provided with an alarm program.
The application method of the under-film drainage pressure reduction structure comprises the following steps: the water level monitoring system is characterized in that a water drainage level, a water shutdown level and a warning level are preset in the liquid level monitoring system: when the water level rises to a drainage water level, the liquid level monitoring system transmits a signal to the automatic control terminal, the automatic control terminal analyzes the signal and then starts the water pump, and the water pump starts to pump and drain water; when the water level is reduced to a shut-off water level, the liquid level monitoring system transmits a signal to the automatic control terminal, the automatic control terminal analyzes the signal and then closes the water pump, and the water pump stops pumping and draining water; when the water pump is in failure or the water level rising speed exceeds the pumping and draining speed, the water level rises to the warning water level, the liquid level monitoring system transmits a signal to the automatic control terminal, and the automatic control terminal starts an alarm after analyzing the signal and is intervened by a worker; and restarting the system after the staff completes the pumping and drainage task and inspects and maintains the pumping and drainage system, and recovering the normal work.
Further, the setting of the water level of the water pump meets the requirements of two points: (1) lower than a warning water level; (2) the water level is higher than the shut-down water level, so that the water suction pump is prevented from being broken down or damaged due to frequent opening and closing; and/or the presence of a gas in the gas,
the setting of the shut-down water level needs to meet the requirement of the submerging depth required by the normal use of the water pump; and/or the presence of a gas in the gas,
the alarm water level is set to be lower than the theoretical minimum safe water level, and enough time is reserved for manual auxiliary water pumping.
Optionally, the water storage volume between the starting and draining water level and the warning water level meets the requirement that the water storage time under the maximum water inlet flow is not less than 0.5 hour; and/or the presence of a gas in the gas,
the water storage capacity between the starting and draining water level and the stopping water level meets the requirements that the water pump is not less than 10 minutes for normal water pumping and not less than 1 hour for water storage.
Optionally, the water storage volume between the warning water level and the theoretical lowest safe water level meets the requirement that the water storage time under the maximum water inflow rate is not less than 1 hour.
Optionally, the theoretical minimum safe water level refers to a stable underground water level for resisting the floating of the geomembrane under all working conditions.
The beneficial effects obtained by the invention comprise:
1. the arrangement of the blind ditches under the membrane absorbs the characteristic of 'veins', the section size of the drainage decompression blind ditches under the membrane is coordinated with the overflowing amount, and the arrangement mode has better economy.
The 'vein' -shaped blind ditch can be well adapted to the condition of irregular boundaries of reservoirs in coastal areas.
3. The problem of reservoir geomembrane bloating or floating damage in areas with higher underground water levels is solved, and the safety and the reliability of the geomembrane seepage-proofing structure are ensured.
4. The problem that underground salt water invades the fresh water reservoir due to the adoption of a check valve drainage pressure reduction structure is avoided, and precious fresh water resources are protected.
5. The pumping and draining system adopts an automatic control means, so that the labor cost for monitoring the underground water level and starting the water pump in a conventional mode can be saved, and the risk caused by human factors can be avoided, wherein the method comprises the following steps: the risk of structural damage caused by untimely detection or untimely detection of underground water rising is caused; the risk of damage to the water pump due to untimely stopping of the water pump; casualty risk caused by improper operation, and the like.
Drawings
FIG. 1 is a schematic plan view of a drainage pressure-reducing structure under a membrane according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a drainage pressure-reducing structure under a membrane according to an embodiment of the present invention.
In the figure, 11. "main pulse" cul-de-sac; the 'inferior pulse' cul-de-sac; the branch's veins' cul-de-sac; 2. a water collecting tank; 31. an automatic control terminal; 32. a liquid level monitoring system; 33. a water pump; 34. a stationary alarm; 35. a portable alarm; 36. a drain pipe; 41. stopping the water level; 42. starting water drainage level; 43. warning the water level; 44. the theoretical lowest safe water level; 5. an impermeable geomembrane; 61. a reservoir boundary; 62. reservoir bank slopes; 63. water in the reservoir.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 and 2, the under-membrane drainage and pressure reduction structure of the geomembrane anti-seepage structure of the reservoir tray suitable for the coastal region comprises an under-membrane air guide drainage blind ditch, a water collecting tank 2 and a pumping and draining system.
The geomembrane anti-seepage structure refers to an anti-seepage body taking an anti-seepage geomembrane 5 (a single-layer geomembrane or a double-layer geomembrane) as an anti-seepage main material.
The inferior membrane air guide drainage blind ditch adopts a 'vein' shaped arrangement mode and is divided into a 'main vein' blind ditch 11, a 'secondary vein' blind ditch 12 and a 'branch vein' blind ditch 13, the 'main vein' blind ditch 11 is an air guide drainage main pipe for communicating each 'secondary vein' blind ditch 12 with the water collecting tank 2, the 'secondary vein' blind ditch 12 is a blind ditch for communicating each 'branch vein' blind ditch 13 with the 'main vein' blind ditch 11, the 'branch vein' blind ditch 13 is a tail end air guide drainage blind ditch, and the 'branch vein' blind ditch 13 is communicated with the 'secondary vein' blind ditch 12.
The 'main vein' blind ditch 11 is arranged on the approximate central axis of the reservoir as much as possible, divides the reservoir into two parts with approximately equal areas, and is arranged along the long axis direction. The 'main vein' blind ditch 11 is a main channel for discharging water and gas, and the water (gas) in the 'branch vein' blind ditch 13 and the 'secondary vein' blind ditch 12 are gathered in the 'main vein' blind ditch 11, and the water (gas) in the surrounding soil body is absorbed at the same time.
The two regions divided by the "main vein" cul-de-sac 11 are further divided into a plurality of sub-regions with approximately equivalent areas. The 'secondary pulse' cul-de-sac 12 is arranged on the approximate central axis of each sub-region. Each "secondary pulse" blind ditch 12 is responsible for the drainage and pressure reduction task in the area in which it is located.
When the influence radius of the ' secondary vein ' blind ditches 12 is not enough to meet the drainage (gas) requirement of the subareas, branch vein ' blind ditches 13 extending towards the periphery are arranged. The drainage (gas) range is distributed in the whole sub-region through the influence radius of the branch vessel blind ditches 13, and the next stage of branch vessel blind ditches can be additionally arranged on the branch vessel blind ditches 13 if necessary. The arrangement number of the branch vein blind ditches 13 and the secondary vein blind ditches 12 is determined by selecting the optimal arrangement mode after technical and economic comparison according to factors such as the area size of the reservoir ditch, the shape of the reservoir area, the groundwater replenishment quantity, the soil layer permeability and the like.
The blind ditch is formed by PVC pipes with holes perforated at the periphery of medium coarse sand and outer geotextile, can be replaced by quick-discharging screws of the medium coarse sand and the outer geotextile, and can also be replaced by broken stones of the outer geotextile.
Under this under-membrane drainage pressure reduction system, the main drainage paths of under-membrane water (or gas) are as follows: the water (or gas) in the soil is → the branch artery blind ditch 13 → the secondary artery blind ditch 12 → the main artery blind ditch 11 → the water collecting tank 2 → the water pump → an external municipal pipe network or a drainage channel and the like. Thus, it can be understood that: the flow of water (or gas) in the blind ditch is gradually increased in the branch vein blind ditch 13, the minor vein blind ditch 12 and the main vein blind ditch 11, and the more downstream the flow is, the larger the overflow. In order to ensure smooth drainage of water (gas), the cross section size, namely the cross section size of water (gas) passing increases along with the gradual increase of the overflowing amount. It can also be understood that the larger the range of the drainage (gas) is, the larger the overflow quantity is, and the larger the required water section size of the blind ditch is. Under the normal condition, in order to ensure the water body to flow smoothly by itself, the blind ditch is provided with a longitudinal slope, and in the system, no matter the blind ditch with a rectangular or trapezoidal section is adopted, the part with the increased area of the water passing section can be just used for forming the longitudinal slope, so that the earthwork excavating and filling amount is reduced, and the economic benefit maximization is realized.
In a downward aerial plan view, an angle between a direction in which the next-stage cul-de-sac extends and a direction in which the previous-stage cul-de-sac extends is preferably 45 ° to 90 °, specifically, an angle between a direction in which the "minor-vein" cul-de-sac 12 extends and a direction in which the "main-vein" cul-de-sac 11 extends is 45 ° to 90 °, and an angle between a direction in which the "branch-vein" cul-de-sac 13 extends and a direction in which the "minor-vein" cul-de-sac 12 extends is 45 ° to 90 °.
When the blind ditches adopt PVC pipes perforated with medium coarse sand and the peripheries of outer-coated geotextiles, or quick drainage pipes of the medium coarse sand and the outer-coated geotextiles, the connection between the 'main vein' blind ditches 11, the 'secondary vein' blind ditches 12 and the 'branch vein' blind ditches 13 can adopt PVC three-way pipes to connect the perforated PVC pipes and the quick drainage pipes; when the blind ditch adopts the broken stone wrapped with the geotextile, the geotextile wrapped outside the joint should be in tight lap joint, so that the good reverse filtering effect is ensured.
The water collecting tank 2 is a water storage structure arranged outside the bottom side line of the reservoir, and because the water collecting tank 2 is embedded deeply and is below the underground water level, anti-seepage measures need to be taken, so that the influence on the use function caused by the infiltration of underground water is reduced or avoided. The water collecting tank 2 is arranged in a position close to the reservoir area, close to a municipal drainage pipeline or drainage channel, good in geological condition and convenient to traffic, meets local planning and has little influence on the surrounding environment, and reservoir area topographic condition, geological condition, peripheral matching condition and other factors are considered.
The water collecting tank 2 is a structure buried underground, can adopt a column body or other body type structure bodies, and meets the requirements of strength, rigidity and stability. The volume should be calculated in combination with the amount of water displaced under the membrane.
In order to ensure the reliable connection between the 'main vessel' blind drain 11 and the water collecting tank 2, the blind drain is suitable to be switched into a solid-wall pipe within a distance of 2 to 10m from the water collecting tank. The solid wall pipe is tightly connected with the tank wall of the water collecting tank 2, so that water seepage at the joint is avoided.
The pumping and draining system comprises an automatic control terminal 31, a liquid level monitoring system 32, a water suction pump 33, a fixed alarm 34 and a portable alarm 35 which are arranged on the water collecting tank 2 and are matched with each other in a connecting mode.
The level monitoring system 32 monitors the water level in the sump 2 based on preset start and stop water levels 41, 42 and a warning water level 43. When the water level rises to the water drainage starting level 41, the liquid level monitoring system 32 transmits a signal to the automatic control terminal 31, the automatic control terminal 31 analyzes the signal and then starts the water suction pump 33, and the water suction pump 33 starts water drainage; when the water level is reduced to a shut-off water level 42, the liquid level monitoring system 32 transmits a signal to the automatic control terminal 31, the automatic control terminal 31 analyzes the signal and then shuts off the water suction pump 33, and the water suction pump 33 stops pumping and draining water; when the water pump 33 is in failure or the water level rising speed exceeds the pumping and draining speed, the water level rises to the warning water level 43, the liquid level monitoring system 32 transmits a signal to the automatic control terminal 31, the automatic control terminal 31 analyzes the signal and transmits an alarm signal to the fixed alarm 34 and the portable alarm 35, and the staff intervenes. And restarting the system after the staff completes the pumping and drainage task and inspects and maintains the pumping and drainage system, and recovering the normal work.
The shut-down level 42 is set to meet the required submergence depth requirement for normal use of the suction pump 33.
The theoretical minimum safe water level 44 is the underground water level which meets the requirement of the anti-floating stability of the geomembrane under all working conditions and is determined by calculation according to engineering conditions.
The setting of the warning water level 43 needs to be lower than the theoretical minimum safe water level 44, and the water storage volume between the warning water level and the theoretical minimum safe water level 44 meets the requirement that the water storage time under the maximum water inflow rate is not less than 1 hour, so that enough time is reserved for manual auxiliary water pumping.
The set water level 41 needs to satisfy two requirements: (1) the water storage volume between the water storage volume and the warning water level 43 is ensured to meet the requirement that the water storage time is not less than 0.5 hour under the maximum water inlet flow; (2) is higher than the shut-off water level 42, ensures that the water storage volume between the water storage volume and the shut-off water level 42 meets the requirements that the water pump 33 normally pumps water for not less than 10 minutes and not less than 1 hour, and avoids the water pump 33 from being broken down or damaged due to frequent opening and closing.
The alarms are a fixed alarm 34 disposed in a duty room or office where a worker is located and a portable alarm 35 that the worker can carry around.
This pump drainage system can save monitoring ground water level under the conventional mode and open the required cost of labor of suction pump on the one hand, and on the other hand can avoid the risk that brings because of people's factor, include: the risk of structural damage caused by untimely detection or untimely detection of underground water rising is caused; risk of damage to the water pump due to untimely pump shutdown; casualty risk caused by improper operation, and the like.
The drainage pressure-reducing blind ditches are generally divided into three stages, namely a 'main vein' blind ditch, a 'secondary vein' blind ditch and a 'branch vein' blind ditch. The grading blind ditch is more economical and reasonable on the premise of meeting the drainage pressure reduction requirement.
In actual engineering, the area, shape, groundwater replenishment condition, soil permeability and the like of the reservoir area may have large differences. For example, in some cases, when only one such under-membrane drainage pressure-reducing structure is provided, the cross-sectional dimension required for drainage of the "main vein" blind ditch 11 may be too large, which may be uneconomical. The reservoir area may be divided into two or more areas in which the under-film drainage pressure reduction structures are disposed, respectively. In this embodiment, one under-film drainage pressure reduction structure is disposed in the reservoir area, and when a plurality of under-film drainage pressure reduction structures are disposed in different areas, reference may be made to this embodiment, which is not described herein again.
The foregoing description and description of the embodiments are provided to facilitate the understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications can be made to the disclosure and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above description and the description of the embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (15)
1. A under-film drainage and pressure reduction structure suitable for a reservoir plate of a reservoir in a coastal region is characterized by comprising an under-film air guide drainage structure, a water collecting tank and a pumping drainage system; the water collecting tank is a water storage structure which is arranged outside the reservoir and connected with the under-membrane air guide and drainage structure; the pumping and draining system is arranged on the water collecting tank, and the air guide and drainage structure under the membrane is arranged in a vein shape.
2. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 1, wherein: the vein-shaped arrangement mode is as follows: the inferior membrane air guide drainage structures include from higher level to subordinate, each grade of french drain that expandes step by step, including "main arteries" french drain, "inferior arteries" french drain and "branching arteries" french drain, "main arteries" french drain is that communicate each "secondary arteries" french drain with the air guide drainage trunk of catch basin, "secondary arteries" french drain is that communicate each "branching arteries" french drain and the french drain of "main arteries" french drain, "branching arteries" french drain is terminal air guide drainage french drain, "branching arteries" french drain with "secondary arteries" french drain intercommunication.
3. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 1, wherein:
the 'main pulse' blind ditches are arranged on an approximate central axis of the reservoir, divide the reservoir into two parts with approximately equal areas and are arranged along the long axis direction; and/or the presence of a gas in the atmosphere,
two areas divided by the 'main pulse' blind ditches are respectively divided into a plurality of sub-areas with approximately equivalent areas, the 'secondary pulse' blind ditches are respectively arranged on approximate central axes of the sub-areas, and the 'secondary pulse' blind ditches are responsible for drainage and pressure reduction tasks of the areas where the 'secondary pulse' blind ditches are located; and/or the presence of a gas in the gas,
arranging branch vein blind ditches extending to the periphery, and distributing the drainage or gas range in the whole sub-area through the influence radius of the branch vein blind ditches; and/or the presence of a gas in the gas,
and subordinate culverts are added on the branch culverts step by step.
4. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 2, wherein: the section size of each stage of blind ditches is determined by the water passing section required by the section overflow, the larger the discharge range is, the larger the section overflow is, the larger the size of the section of the blind ditch is, and the larger the size of the blind ditch closer to the water collecting tank on one path is.
5. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 2, wherein: the blind ditch is provided with a longitudinal slope, and the part with the increased water cross-sectional area is used for forming the longitudinal slope so as to reduce the earth excavation and filling amount.
6. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 2, wherein: the angle between the extending direction of the next-stage blind ditch and the extending direction of the previous-stage blind ditch is 45-90 degrees.
7. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 2, wherein:
the water collecting tank is a water storage structure arranged outside the bottom side line of the reservoir and is provided with a seepage-resistant arrangement for reducing or avoiding the infiltration of underground water; and/or the presence of a gas in the gas,
the arrangement of the water collecting tank is close to a reservoir area, close to a municipal drainage pipeline or a drainage channel, and the water collecting tank is good in geological condition, convenient to transport, in line with local planning and small in influence on the surrounding environment; and/or the presence of a gas in the atmosphere,
the water collecting tank is a structural body meeting the requirements of strength, rigidity and stability, and the volume of the water collecting tank corresponds to the water discharge amount under the membrane; and/or the presence of a gas in the gas,
the water collecting tank is connected with a solid-wall pipe in a switching way within the range of 2-10 m so as to realize the reliable connection of the main vein blind ditch and the water collecting tank, and the solid-wall pipe is tightly connected with the tank wall of the water collecting tank, so that the water seepage at the joint is avoided.
8. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 2, wherein: the blind ditch is a PVC pipe with holes punched around the medium coarse sand and the outer geotextile, or a quick-discharge pipe with the medium coarse sand and the outer geotextile, or crushed stone with the outer geotextile.
9. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 1, wherein: the pumping and draining system comprises an automatic control terminal, a liquid level monitoring system, a water suction pump and an alarm which are arranged on the water collecting tank and are mutually connected and matched.
10. The under-mulch drainage pressure relief structure for a coastal region reservoir tray as claimed in claim 9, wherein: the alarm comprises a fixed alarm arranged in a duty room or an office where a worker is located and a portable alarm carried by the worker; and/or the presence of a gas in the atmosphere,
the portable alarm carried with the user is a mobile phone provided with an alarm program.
11. The method for applying the under-film drainage pressure reduction structure according to any one of claims 1 to 10, comprising the steps of: the water level monitoring system is characterized in that a water drainage level, a water shutdown level and a warning level are preset in the liquid level monitoring system: when the water level rises to a drainage water level, the liquid level monitoring system transmits a signal to the automatic control terminal, the automatic control terminal starts the water suction pump after analyzing the signal, and the water suction pump starts to pump and drain water; when the water level is reduced to a shut-off water level, the liquid level monitoring system transmits a signal to the automatic control terminal, the automatic control terminal analyzes the signal and then closes the water pump, and the water pump stops pumping and draining water; when the water pump is in failure or the water level rising speed exceeds the pumping and draining speed, the water level rises to the warning water level, the liquid level monitoring system transmits a signal to the automatic control terminal, and the automatic control terminal starts an alarm after analyzing the signal and is intervened by a worker; and restarting the system after the staff completes the pumping and drainage task and inspects and maintains the pumping and drainage system, and recovering the normal work.
12. The application method of the under-membrane drainage pressure reduction structure according to claim 11, wherein the setting of the drainage water level meets two requirements: (1) lower than a warning water level; (2) the water level is higher than the shut-down water level, so that the water suction pump is prevented from being failed or damaged due to frequent opening and closing; and/or the presence of a gas in the gas,
the setting of the shut-down water level needs to meet the requirement of the submerging depth required by the normal use of the water pump; and/or the presence of a gas in the gas,
the alarm water level is set to be lower than the theoretical minimum safe water level, and enough time is reserved for manual auxiliary water pumping.
13. The method for applying the under-film drainage pressure reduction structure according to claim 12, wherein: the water storage volume between the starting and draining water level and the warning water level meets the requirement that the water storage time under the maximum water inflow rate is not less than 0.5 hour; and/or the presence of a gas in the gas,
the water storage amount between the starting and draining water level and the stopping water level meets the requirements that the water pump is used for pumping water normally for not less than 10 minutes and the water storage is used for not less than 1 hour.
14. The method for applying the under-film drainage pressure reduction structure according to claim 12, wherein: the water storage volume between the warning water level and the theoretical lowest safe water level meets the requirement that the water storage time under the maximum water inflow is not less than 1 hour.
15. The method for applying the under-film drainage pressure reduction structure according to claim 14, wherein: the theoretical lowest safe water level refers to the underground water level which meets the requirement of stable anti-floating of the geomembrane under all working conditions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210968131.3A CN115387284A (en) | 2022-08-12 | 2022-08-12 | Under-film drainage pressure reduction structure suitable for reservoir plate of reservoir in coastal region and application method |
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| CN202210968131.3A CN115387284A (en) | 2022-08-12 | 2022-08-12 | Under-film drainage pressure reduction structure suitable for reservoir plate of reservoir in coastal region and application method |
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| CN111254880A (en) * | 2020-01-20 | 2020-06-09 | 济南大学 | Water-gas separation type under-membrane drainage integrated system for horizontal impermeable layer of plain reservoir |
| CN112750283A (en) * | 2020-12-29 | 2021-05-04 | 浙江大学 | Underground structure floating early warning system based on automatic pumping and drainage of water collecting well and working method thereof |
| CN113914291A (en) * | 2021-09-09 | 2022-01-11 | 河海大学 | Under-membrane exhaust blind ditch and design method thereof |
| CN216515520U (en) * | 2021-09-02 | 2022-05-13 | 山西机械化建设集团有限公司 | Underground drainage structure of high-fill engineering in water-rich area |
| CN218712617U (en) * | 2022-08-12 | 2023-03-24 | 中交上海航道勘察设计研究院有限公司 | Under-film drainage pressure reduction structure of reservoir plate of reservoir in coastal region |
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- 2022-08-12 CN CN202210968131.3A patent/CN115387284A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254880A (en) * | 2020-01-20 | 2020-06-09 | 济南大学 | Water-gas separation type under-membrane drainage integrated system for horizontal impermeable layer of plain reservoir |
| CN112750283A (en) * | 2020-12-29 | 2021-05-04 | 浙江大学 | Underground structure floating early warning system based on automatic pumping and drainage of water collecting well and working method thereof |
| CN216515520U (en) * | 2021-09-02 | 2022-05-13 | 山西机械化建设集团有限公司 | Underground drainage structure of high-fill engineering in water-rich area |
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Application publication date: 20221125 |