CN103741671A - Groundwater recharge system structure for foundation pit dewatering - Google Patents
Groundwater recharge system structure for foundation pit dewatering Download PDFInfo
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- CN103741671A CN103741671A CN201410029930.XA CN201410029930A CN103741671A CN 103741671 A CN103741671 A CN 103741671A CN 201410029930 A CN201410029930 A CN 201410029930A CN 103741671 A CN103741671 A CN 103741671A
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Abstract
The invention relates to a groundwater recharge system structure for foundation pit dewatering. The purpose of the invention is to provide a groundwater recharge system structure for foundation pit dewatering which is capable of reducing and retarding surrounding stratum settlement and ground settlement caused by foundation pit dewatering under the state of an enormously thick confined aquifer, and simultaneously capable of overcoming the shortcomings such as recharge well blockage and water outflowing at the outer side in the prior art, improving the recharge efficiency and also prolonging the service life of the recharge system. The groundwater recharge system structure is matched with a foundation pit depressurizing system in use, and comprises a recharge well and a recharge device, wherein the recharge well comprises a well pipe; a water stop layer, a water-resisting layer and a filter layer are orderly arranged on the outer wall of the well pipe from top to bottom, a mudjacking pipe is reserved outside the well pipe, a sedimentation pipe is arranged at the bottom of the well pipe, a two-layer wind filter is arranged at the upper part of the sedimentation pipe, and a water suction pump is arranged in the well pipe 2-6m away from the bottom of the well, and the like; the recharge device comprises a recharge pipeline, a water release pipeline, an exhaust pipeline and the like.
Description
Technical field
The present invention relates to the base pit engineering technical field in municipal administration, building engineering field geotechnical engineering, specifically, is a kind of groundwater recharge system architecture for foundation pit dewatering.
Background technology
Base pit engineering is for excavating the earthwork at engineering underground structure place, guarantees foundation ditch and safety of surrounding environment and the general name of the engineering measures such as going along with sb. to guard him of taking, support, precipitation, reinforcing, shoveling and backfill.Foundation pit dewatering is at the inside and outside well casing of burying underground of foundation ditch, utilizes plant equipment to draw water, the engineering means that groundwater level is reduced.Groundwater control is for Foundation Pit Construction and reduces draining, precipitation, the sealing that impact is taked on surrounding enviroment or the measure such as recharge.
Excavation of foundation pit and precipitation can cause foundation ditch ground around the distortion such as sedimentation to a certain degree occurs, and water-stop curtain and recharge arranging of structure and can effectively reduce the surface settlement that fender body outside environment causes due to excavation of foundation pit and precipitation, slow down the time that sedimentation occurs, reduce the size that sedimentation occurs, suppress the surrounding ground sedimentation that foundation pit dewatering causes, surrounding ground sedimentation, especially in foundation ditch being had to the huge thick aquifer of artesian water of destruction, its effect is remarkable.Recharging structure is comprised of under ground portion recharge well and overground part backflow device two parts.Dewatering well strainer should be embedded in water-stop curtain bottom with within shallow 5.0m, recharges engineering suitability and is: the huge thick artesian aquifer that affects foundation ditch safety and stability is not cut off by water-stop curtain, and one-level foundation ditch first class of protection, meets regional land subsidence and control requirement.Arranging of water-stop curtain and recharge well is mainly to lengthen the seepage flow approach of underground water to foundation ditch harm, strengthening fender body is controlled the measure of decline of groundwater level amplitude outward, Main Function is to reduce the surface settlement that fender body outside environment causes due to excavation of foundation pit and precipitation, slow down the time that sedimentation occurs, reduce the size that sedimentation occurs, suppress the surrounding ground sedimentation that foundation pit dewatering causes.
Yet there is following problem in existing ground water recharging well: use after certain hour, reason because of the fine grained medium itself in suspension, bubble, chemical precipitation, growth of microorganism and aquifer, cause blocking of recharge well, effect is recharged in impact, even occurs to fill with and not; When the recharging pressure and surpass 1.0MPa of well, the outside of well tends to emit water, and effect is recharged in impact.
Summary of the invention
The object of this invention is to provide a kind of groundwater recharge system architecture for foundation pit dewatering, can reduce and slow down periphery stratum settlement and surface settlement that the foundation pit dewatering under huge thick artesian aquifer state causes, can solve the defect such as blocking of recharge well or outside Mao Shui in prior art, improve and recharge the application life that efficiency extends recharge system simultaneously simultaneously.
The object of the present invention is achieved like this:
A kind of groundwater recharge system architecture for foundation pit dewatering, described recharge system comprises recharge well and backflow device, edge at foundation ditch is provided with water-stop curtain, described water-stop curtain partly inserts in artesian aquifer as described bracing of foundation pit, it is inner that pressure reduction well is located at described water-stop curtain, it is outside that described recharge well is located at described water-stop curtain, artesian water between described pressure reduction well and recharge well is communicated with, the bottom of described pressure reduction well and recharge well is respectively equipped with strainer, and the bottom of described strainer is shallower than the bottom of described water-stop curtain;
Described recharge well comprises: well casing, the outer wall of described well casing is provided with sealing layer, water barrier and filtration beds from top to bottom successively, described sealing layer implements compaction grouting or concrete backfill is stirred, and described water barrier is that clay ball is filled formation, and described filtration beds is that quartz sand inserts forms; At described well casing, reserve madjack pipe outward, the bottom of described madjack pipe is higher than the bottom of described water barrier, at the bottom of the pipe of described well casing, be provided with sediment tube, top at described sediment tube is provided with Dual-layer wire wound filter, the height of described filtration beds is greater than the height of described Dual-layer wire wound filter, in described well casing, from 2-6 rice, shaft bottom, be provided with a suction pump, the pump line of described suction pump is connected to well head, for the Hui Yang of described recharge well;
Described backflow device comprises: recharge pipeline, sluice pipe and extract duct; The described pipeline that recharges is provided with water meter, booster pump and recharges pressure meter, the described pipeline one end of recharging connects pressure reduction well, the underground water of extracting out in pressure reduction well is as recharging water source, the other end stretches in recharge well, described recharging on pipeline is also provided with blowoff basin, and the unnecessary underground water of extracting out in pressure reduction well enters blowoff basin; It is interior to water barrier At The Height that described well casing is stretched in described sluice pipe one end, and the other end stretches out described recharge well well head; Described extract duct stretches out from described recharge well well head, is provided with successively steam vent, non retern valve, vacuum pump on it.
Wherein, the porosity of described Dual-layer wire wound filter is greater than 30%, and the space between two-layer pipe is filled with quartz sand, and sand grains diameter is 2.5～5.5mm, twines a spacing 1.0～2.0mm, the wide 2.0mm of silk, the thick 3.0mm of silk.
Described Dual-layer wire wound filter is double-layer pipe, inner layer steel pipe diameter 273.0mm, thickness 4.0～8.0mm, outer layer pipe diameter 350.0mm, thickness 4.0～8.0mm.
Preferably, described madjack pipe is three, is evenly distributed on the outside of described well casing, together with described well casing colligation.
Preferably, described madjack pipe is provided with anti-mud and enters structure.Particularly, as a more excellent scheme, the pipe of described madjack pipe is surrounded by thin tire outward, is equipped with 4～5 diameters and is the hole of 5 millimeters in the bottom of described madjack pipe.
Further, the spacing between described water-stop curtain and recharge well is not less than 6.0 meters; The bottom of described Dual-layer wire wound filter is not less than 5.0 meters than the difference in height between the bottom of water-stop curtain; Described recharge well bore diameter is 800 millimeters.
Preferably, described steam vent is recharging front opening until close after flowing water, for discharging air, thereby makes recharge water continuous-flow, otherwise effect is recharged in impact, recharges regularly exhaust in process, and whether check recharges unobstructed.
Preferably, described non retern valve and vacuum pump, recharging front opening until air-water mixture is closed after vacuum pump flows out water, for discharging air, thereby accelerate recharge water continuous-flow, improve and recharge efficiency.
The present invention is owing to having adopted technique scheme, compared with prior art there is following beneficial effect: (1) is used the present invention for the groundwater recharge system architecture of foundation pit dewatering, can reduce under huge thick artesian aquifer state surface settlement foundation ditch peripheral ground being caused because of excavation of foundation pit and foundation pit dewatering, slow down time and size that sedimentation occurs, and suppress periphery stratum settlement and the surface settlement that foundation pit dewatering causes; (2) due to the use of recharge well, this structure can be saved the degree of depth of water-stop curtain diaphragm wall greatly, and energy-saving and environment friendly reduces underground obstacle and realizes sustainable development; (3) the present invention adopts for recharge water water source in the groundwater recharge system architecture of foundation pit dewatering the underground artesian water that in hole, pressure reduction well is extracted out, saves water rate, prevents groundwater pollution, has reduced effluent discharge, has realized Groundwater Comprehensive recycling; (4) the present invention has solved the defect such as blocking of recharge well or outside Mao Shui in prior art for the recharge well in the groundwater recharge system architecture of foundation pit dewatering, when raising ground water recharging well recharges efficiency, has extended its application life.
Accompanying drawing explanation
By following embodiments of the invention description taken together with the accompanying drawings, other advantage of the present invention and feature are shown, this embodiment provides with the form of example, but is not limited to this, wherein:
Fig. 1 is that the present invention is for the structural representation of the groundwater recharge system architecture of foundation pit dewatering;
Fig. 2 is the structure enlarged drawing of recharge well shown in Fig. 1.
The specific embodiment
The groundwater recharge system architecture for foundation pit dewatering as shown in Figure 1, comprise recharge well 5 and backflow device, at the edge of foundation ditch 1, be provided with water-stop curtain 3, water-stop curtain 3 partly inserts going along with sb. to guard him as foundation ditch 1 in artesian aquifer 4, pressure reduction well 2 is located at the inside of water-stop curtain 3, recharge well 5 is located at the outside of water-stop curtain 3, artesian water between pressure reduction well 2 and recharge well 5 is communicated with, the bottom of pressure reduction well 2 and recharge well 5 is respectively equipped with strainer, and the bottom of strainer is shallower than the bottom of water-stop curtain 3.
Shown in Fig. 2, recharge well 5 comprises: well casing 18, the outer wall of well casing 18 is provided with sealing layer 7, water barrier 22 and filtration beds 21 from top to bottom successively, wherein sealing layer 7 is implemented compaction grouting or concrete backfill stirring formation, water barrier 22 is filled and is formed for clay ball, and filtration beds 21 is the formation of quartz sand inserts; At outer reserved three madjack pipes 25 of well casing 18, be evenly distributed on the outside of well casing 18, together with well casing 18 colligations.Madjack pipe 25 is provided with anti-mud and enters structure, and specifically the pipe at madjack pipe 25 is surrounded by thin tire outward, is equipped with 4～5 diameters and is the hole of 5 millimeters in the bottom of madjack pipe 25.Recharge while emitting water and to be emergently pressed into Fast Setting Cement Slurry, prevent that recharge well 5 pressurizations from recharging underground water and emitting water from weak sealing layer 7.
The bottom of madjack pipe 25 is higher than the bottom of water barrier 22, at the bottom of the pipe of well casing 18, be provided with sediment tube 20, on the top of sediment tube 20, be provided with Dual-layer wire wound filter 19, the height of filtration beds 21 is greater than the height of Dual-layer wire wound filter 19, in well casing 18, from 2-6 rice, shaft bottom, be provided with a suction pump (not shown), the pump line of suction pump is connected to well head, for the Hui Yang of recharge well 5.
Backflow device 6 comprises: recharge pipeline 61, sluice pipe 62 and extract duct 63; Recharging pipeline 61 is provided with water meter 13, booster pump 14 and recharges pressure meter 15, recharge pipeline 61 one end and connect pressure reduction well 2, the underground water of extracting out in pressure reduction well 2 is as recharging water source, the other end stretches in recharge well 5, recharge on pipeline 61 and be also provided with blowoff basin 12, the unnecessary underground water of extracting out in pressure reduction well 2 enters blowoff basin 12; It is interior to water barrier 22 At The Heights that well casing 18 is stretched in sluice pipe 62 one end, and the other end stretches out the well head of recharge well 5; Extract duct 63 stretches out from the well head of recharge well 5, is provided with successively steam vent 17, non retern valve 23, vacuum pump 24 on it.Steam vent 17 is recharging front opening until close after flowing water, for discharging air, thereby makes recharge water continuous-flow, otherwise effect is recharged in impact, recharges regularly exhaust in process, and whether check recharges unobstructed; Non retern valve 23 and vacuum pump 24, recharging front opening until air-water mixture is closed after vacuum pump 24 flows out water, for discharging air, thereby accelerate recharge water continuous-flow, improve and recharge efficiency.
Wherein, the porosity of Dual-layer wire wound filter 19 is greater than 30%, and the space between two-layer pipe is filled with quartz sand, and sand grains diameter is 2.5～5.5mm, twines a spacing 1.0～2.0mm, the wide 2.0mm of silk, the thick 3.0mm of silk.Dual-layer wire wound filter 19 is double-layer pipe, inner layer steel pipe diameter 273.0mm, thickness 4.0～8.0mm, outer layer pipe diameter 350.0mm, thickness 4.0～8.0mm.
Spacing between water-stop curtain 3 and recharge well 5 is not less than 6.0 meters; The bottom of Dual-layer wire wound filter 19 is not less than 5.0 meters than the difference in height between the bottom of water-stop curtain 3; Recharge well 5 bore diameters are 800 millimeters.
During work, pressure reduction well 2 requires " step-down as required, dynamically step-down ", when having prominent gushing to artesian water through 9 pairs of foundation ditch bottom surfaces 10 of aquitard, pressure water head 8 height do the used time, safety factor 1.05～1.35, start to open pressure reduction well 2, when outside foundation ditch, the distortion of the object of protection such as surface settlement is larger, recharge well 5 requires " to recharge as required, dynamically control ", the underground water of the interior pressure reduction well 2 interior extractions of foundation ditch 1 not ingress of air accesses recharge well 5 as recharging water source recharging under the interior reducing condition of pipeline 61, the underground water that the unnecessary pressure reduction well 2 of part is extracted out enters blowoff basin 12, after three grades of precipitations, enter municipal pipeline again.Recharge well 5 recharges with pressure reduction well 2 and draws water and synchronize, precipitation, recharge synchronous, adjust draw water, recharge well number and pump-out, the amount of recharging draw water as required and recharge as required, recharge well 5 regularly returns and raises maintenance.
Under different excavation pit bottom surface 10 situations, maintaining underground water is having the seepage flow dynamic equilibrium under water-stop curtain 3 effect, takes into full account and recharges the reduction of raising water level in foundation ditch, or increase pressure reduction well 2 or strengthen pressure reduction well 2 flow that draws water while recharging design.Same, after base plate of foundation pit waters, in pressure reduction well 2 and recharge well 5, in underground pressure water head 8, lift, maintain the seepage action of ground water dynamic equilibrium under water-stop curtain 3 effects, guarantee that artesian aquifer 4 groundwater table have prominent gushing lower than artesian water through 9 pairs of foundation ditch bottom surfaces 10 of aquitard and make used time pressure water head 8, until recharge well 5 end-of-jobs.
After recharging a period of time, because of the effect of physics, chemical reaction or microorganism, in well, can produce impurity, easy obstruction space after accumulation is a certain amount of, effect is recharged in impact.Now should stop recharging, with deep well submerged pump, draw water, impurity in Dual-layer wire wound filter 19 is extracted out.
Recharge well 5 is well-flushing thoroughly, and puts into operation after doing uninterruptedly to draw water for 1-2 days, and the sand content of water outlet should meet the sand content standard of pressure reduction well 2.6 of recharge well 5 and backflow devices should seal air tight at well head place.Utilize the underground water of pressure reduction well 2 extractions to the interior water filling of recharge well 5.Recharge that front-seat pore 17 is opened until flowing water is closed steam vent 17, effect is to discharge air, guarantees recharge water continuous-flow, recharges regularly exhaust in process, and whether check recharges unobstructed.Or adopt vacuum pump 24 gas mixture that draws water, recharge front opening non retern valve 23 until air-water mixture flows out water from vacuum pump 24, close vacuum pump 24 and non retern valve 23, effect is to discharge air, accelerates recharge water continuous-flow, improves and recharges efficiency.Should return every day and raise 1～2 time, after starting, can return every day and raise 1 time, after the amount of recharging reduces gradually, rise to every day 2 times, even 3 times, return every day and raise 1～2 hour, after the water of extracting out is limpid, can continue to recharge.
Claims (10)
1. the groundwater recharge system architecture for foundation pit dewatering, described recharge system comprises recharge well and backflow device, edge at foundation ditch is provided with water-stop curtain, described water-stop curtain partly inserts in artesian aquifer as described bracing of foundation pit, it is inner that pressure reduction well is located at described water-stop curtain, it is outside that described recharge well is located at described water-stop curtain, artesian water between described pressure reduction well and recharge well is communicated with, the bottom of described pressure reduction well and recharge well is respectively equipped with strainer, the bottom of described strainer is shallower than the bottom of described water-stop curtain, it is characterized in that:
Described recharge well comprises: well casing, the outer wall of described well casing is provided with sealing layer, water barrier and filtration beds from top to bottom successively, described sealing layer implements compaction grouting or concrete backfill is stirred, and described water barrier is that clay ball is filled formation, and described filtration beds is that quartz sand inserts forms; At described well casing, reserve madjack pipe outward, the bottom of described madjack pipe is higher than the bottom of described water barrier, at the bottom of the pipe of described well casing, be provided with sediment tube, top at described sediment tube is provided with Dual-layer wire wound filter, the height of described filtration beds is greater than the height of described Dual-layer wire wound filter, in described well casing, from 2-6 rice, shaft bottom, be provided with a suction pump, the pump line of described suction pump is connected to well head, for the Hui Yang of described recharge well;
Described backflow device comprises: recharge pipeline, sluice pipe and extract duct; The described pipeline that recharges is provided with water meter, booster pump and recharges pressure meter, the described pipeline one end of recharging connects pressure reduction well, the underground water of extracting out in pressure reduction well is as recharging water source, the other end stretches in recharge well, described recharging on pipeline is also provided with blowoff basin, and the unnecessary underground water of extracting out in pressure reduction well enters blowoff basin; It is interior to water barrier At The Height that described well casing is stretched in described sluice pipe one end, and the other end stretches out described recharge well well head; Described extract duct stretches out from described recharge well well head, is provided with successively steam vent, non retern valve, vacuum pump on it.
2. groundwater recharge system architecture as claimed in claim 1, it is characterized in that: the porosity of described Dual-layer wire wound filter is greater than 30%, space between two-layer pipe is filled with quartz sand, and sand grains diameter is 2.5～5.5mm, twines a spacing 1.0～2.0mm, the wide 2.0mm of silk, the thick 3.0mm of silk.
3. groundwater recharge system architecture as claimed in claim 1, is characterized in that: described Dual-layer wire wound filter is double-layer pipe, inner layer steel pipe diameter 273.0mm, thickness 4.0～8.0mm, outer layer pipe diameter 350.0mm, thickness 4.0～8.0mm.
4. groundwater recharge system architecture as claimed in claim 1, is characterized in that: described madjack pipe is three, is evenly distributed on the outside of described well casing, together with described well casing colligation.
5. groundwater recharge system architecture as claimed in claim 1, is characterized in that: described madjack pipe is provided with anti-mud and enters structure.
6. groundwater recharge system architecture as claimed in claim 5, is characterized in that: the pipe of described madjack pipe is surrounded by thin tire outward, is equipped with 4～5 diameters and is the hole of 5 millimeters in the bottom of described madjack pipe.
7. groundwater recharge system architecture as claimed in claim 1, is characterized in that: the spacing between described water-stop curtain and recharge well is not less than 6.0 meters; The bottom of described Dual-layer wire wound filter is not less than 5.0 meters than the difference in height between the bottom of water-stop curtain.
8. groundwater recharge system architecture as claimed in claim 1, is characterized in that: described recharge well bore diameter is 800 millimeters.
9. groundwater recharge system architecture as claimed in claim 1, is characterized in that: described steam vent is recharging front opening until close after flowing water, for discharging air.
10. groundwater recharge system architecture as claimed in claim 1, is characterized in that: described non retern valve and vacuum pump are recharging front opening until air-water mixture is closed after vacuum pump flows out water, for discharging air.
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| CN104594325A (en) * | 2015-01-13 | 2015-05-06 | 济南轨道交通集团有限公司 | Quaternary micro-confined water spring protection type recharging well and method |
| CN104594326A (en) * | 2015-01-13 | 2015-05-06 | 济南轨道交通集团有限公司 | Pressurizing and spring protection recharge well and method |
| CN104895099A (en) * | 2015-05-13 | 2015-09-09 | 成都佳美嘉科技有限公司 | Waterproof curtain device |
| CN104975610A (en) * | 2015-07-08 | 2015-10-14 | 上海建工二建集团有限公司 | Expanded-end decompression well, deep foundation pit structure and construction method for expanded-end decompression well |
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| CN104594326A (en) * | 2015-01-13 | 2015-05-06 | 济南轨道交通集团有限公司 | Pressurizing and spring protection recharge well and method |
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| CN104975610A (en) * | 2015-07-08 | 2015-10-14 | 上海建工二建集团有限公司 | Expanded-end decompression well, deep foundation pit structure and construction method for expanded-end decompression well |
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| CN106324226A (en) * | 2016-11-03 | 2017-01-11 | 山东大学 | Pouring and injection integrated indoor testing device and method for monitoring underground water seepage and precipitation |
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Application publication date: 20140423 |