CN102383412A - Construction method by adopting dewatering and water recharging to control sedimentation surrounding deep foundation pit - Google Patents

Construction method by adopting dewatering and water recharging to control sedimentation surrounding deep foundation pit Download PDF

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Publication number
CN102383412A
CN102383412A CN2010102687392A CN201010268739A CN102383412A CN 102383412 A CN102383412 A CN 102383412A CN 2010102687392 A CN2010102687392 A CN 2010102687392A CN 201010268739 A CN201010268739 A CN 201010268739A CN 102383412 A CN102383412 A CN 102383412A
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China
Prior art keywords
foundation pit
water
construction
level
foundation ditch
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Pending
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CN2010102687392A
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Chinese (zh)
Inventor
周长喜
赵鑫
宋志洪
胡仁喜
周华荣
何伯绍
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Third Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
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Third Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
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Application filed by Third Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd filed Critical Third Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
Priority to CN2010102687392A priority Critical patent/CN102383412A/en
Publication of CN102383412A publication Critical patent/CN102383412A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a construction method by adopting dewatering and water recharging to control sedimentation surrounding a deep foundation pit, which comprises the following steps that: quantity and depth of dewatering wells are accurately determined by calculating water inflow of the deep foundation pit under the action of pressure water and the construction quality of finished wells is guaranteed; aquifers and pervious beds of the soil outside the foundation pit are determined through a geological exploration report, a target soil layer to be recharged is calculated, and a steel sleeve is sent to the target soil layer through a method for drilling a slope inside the foundation pit; a high-level water tank is arranged on the top part of the foundation pit, the water outlet of the high-level water tank is connected with a recharging well opening, water inside the foundation pit is pumped by a high-pressure pump to the high-level water tank and then to be pressed to the recharging well through the high-level pressure and to reach the recharged target soil layer. By utilizing the method, the underground water level inside the foundation pit can be maintained at a set water level, so a favorable condition can be created to the project construction. At the same time, the underground water level outside the foundation pit is adjusted to be stably maintained within a warning level, so powerful guarantee can be created for the safety of roads and buildings outside the foundation pit.

Description

Adopt precipitation to recharge the job practices of control deep foundation ditch periphery sedimentation
Technical field
When the present invention relates to the deep foundation pit of construction construction, when deep foundation pit construction is carried out in particularly narrow on construction ground old urban area, to a kind of control method of sedimentation of the peripheral building of foundation ditch.
Background technology
Development along with China's reconstruction of the old city town and urban traffic construction; Domestic deep foundation pit construction constantly increases; Traditional dewatering construction method of deep foundation ditch adopts simple well-points dewatering, and after adopting well-points dewatering, very easily causes the phenomenon that adjacent building, pipeline, pavement cracking are sunk.In recent years the major accident that causes thus is of common occurrence.Therefore, deep foundation pit precipitation will especially cautiously and be taked Corresponding Countermeasures.
The main purpose of foundation pit dewatering has 2 points:
The one, when digging to design substrate absolute altitude quicksand and open fire do not appear, guarantee ability normal construction in the foundation ditch;
The 2nd, prevent the various harm that the outer groundwater table decreasing of foundation ditch is caused built construction thing, pipeline, pavement of road on every side.
According to engineering experience, during well-points dewatering for a long time, the precipitation curved surface gradient is 1/10 of the precipitation radius of influence, and being responsible for buried depth like the well point is S (referring to below the groundwater table), and the then maximum radius of influence can reach 10S.If built construction thing, pipeline, pavement of road are positioned at radius of influence scope, and do not take safeguard procedures, will cause differential settlement, cause inclination, crack.
Deep foundation pit construction under the complex environment is on the increase along with the raising of national economy, deep foundation pit precipitation construction dominate in deep foundation pit construction, and it is controlling the safety of construction speed and Foundation Design.Therefore dewatering construction is taked rational measure, could guarantee the safety of construction.
Summary of the invention
To the defective that exists in the prior art, the present invention provides purpose that a kind of job practices that adopts precipitation to recharge the sedimentation of control deep foundation ditch periphery is provided.Utilize this method, can groundwater table in the foundation ditch be maintained designated water level, create favorable conditions to engineering construction.Simultaneously, regulate the outer underground stable level of foundation ditch in police circles' line, create that for the safety of outer road of foundation ditch and building powerful guarantee being provided.
For realizing above-mentioned purpose, technical scheme of the present invention is:
Adopt precipitation to recharge the job practices of control deep foundation ditch periphery sedimentation, implementation step is:
1. through calculating the foundation ditch water yield under the artesian water effect, accurately confirm the quantity and the precipitation depth of foundation pit dewatering well, and guarantee into the construction quality of well;
2. survey report through ground, confirm the aquifer and the pervious layer of the outer soil layer of foundation ditch, and calculate the target soil layer of moisturizing, adopt the method for off-angle drilling in the foundation ditch, steel sleeve is sent into the target soil layer;
3. at the foundation ditch top high level cistern is set, and with the high level cistern delivery port with recharge well head and link to each other, after the precipitation in the foundation ditch is evacuated to high level cistern with high-pressure pump, utilize high-order pressure with hydraulic pressure to recharge well and arrive the target soil layer that recharges.
The usefulness of technique scheme is:
Safety in order to ensure foundation ditch periphery building; Between precipitation well casing and building, pipeline, road surface, be provided with and recharge the well point; Lasting water recharges, and replenishes the underground water at this place, makes the radius of influence of precipitation well point be no more than the scope of recharging the well point; Prevent to recharge the phreatic loss of well point outside building, make underground water keep constant basically.In guaranteeing foundation ditch in the normal construction, reduce the adverse effect on adjacent building, pipeline, road surface on every side.
In order to reach above-mentioned effect, reply is confirmed well depth, well number exactly through calculating foundation ditch water yield under the artesian water effect.Reasonably mentality of designing and well pattern are the important steps of control amount of precipitation.Dewatering construction must be taken into consideration with the moisturizing construction, and through the effect of head concora crush, the outer underground stable level of control foundation ditch prevents that outer road of foundation ditch and building from sinking because of WATER LEVEL CHANGES causes cracking, thereby guarantees the safety of deep foundation pit construction process.
Description of drawings
Fig. 1 is a precipitation well construction sketch map of the present invention;
Fig. 2 is a recharge well structural representation of the present invention;
Fig. 3 is a recharge system structural representation one of the present invention;
Fig. 4 is a recharge system structural representation two of the present invention.
The specific embodiment
Combine accompanying drawing and embodiment that the present invention is described at present.
A kind of job practices that adopts precipitation to recharge the sedimentation of control deep foundation ditch periphery, it is through calculating the foundation ditch water yield under the artesian water effect, accurately confirming the quantity and the precipitation depth of foundation pit dewatering well.And guarantee into the construction quality of well.Like Fig. 1, shown in 4, precipitation well 1 adopts engineering driller pore-forming, the many 219mm of drilling diameter.Get into severely-weathered 10 meters, and 1 meter of weathered rock formation in getting into, guarantee simultaneously that this precipitation advances apart from mark at the bottom of the engineering piles bearing course at pile end and be no less than 6 meters.For guaranteeing have good water permeability and silt particle to infiltrate; The steel pipe 2 that adopts ; At the eyelet that tube wall is arranged ; And at 2 layer of 20 mesh filter screen of tube wall outside bag, and use the iron wire colligation.Fill the round gravel 3 of 0.5~1cm between the borehole wall and the well casing and in the scope of the interior distance pipe of pipe end 1.5m.
Survey report through ground, confirm the aquifer and the pervious layer of the outer soil layer of foundation ditch, and calculate the target soil layer of moisturizing, adopt the method for off-angle drilling in the foundation ditch.Like Fig. 2, shown in 4, steel sleeve is sent into the target soil layer form recharge well 4.Well casing 5,45 degree and 60 degree that this recharge well 4 adopts alternately pierce foundation pit side-wall until destination layer.Drainage section 6 long 10m, tube wall cloth Eyelet, bag one deck 300g/m simultaneously in the tube wall outside 2The ground geotextiles.Closed section 7 injects to establish between 72, two sections of 0.5: 1 cement pastes and ends slurry bag 71 and isolate.
The sealing system of recharge well 4 adopts ends the method that slurry bag and slip casting combines and carry out: the hypomere 2m of sealing system adopts that to end 71 fillings of slurry bag closely knit, and it is 0.5: 1 cement paste 72 that epimere injects water/binder ratio.Should guarantee the sealing of sealing system during recharging, guarantee air tight water-tight.
Like Fig. 3, shown in 4; At the foundation ditch top high level cistern 8 is set; And these high level cistern 8 delivery ports are linked to each other with recharge well 4 well heads, after the precipitation in the foundation ditch is evacuated to high level cistern 8 with high-pressure pump 9, utilize high-order pressure with hydraulic pressure to recharge well 4 and arrive the target soil layer that recharges.Not enough like pressure, can adopt and raise high level cistern 8 or carry out supercharging with the method for compression pump 9 superchargings.After whole system forms, can carry out the inner precipitation of foundation ditch, precipitation directly is evacuated to high level cistern 8, adopt the method for external tap water 10 simultaneously, guarantee that quantity of water in water tank is sufficient.
During the engineering pile foundation construction, for satisfying the pile foundation construction requirement, can the precipitation well all be opened, but will observe closely the distortion of foundation ditch periphery, when noting abnormalities, should in time close precipitation, increasing is recharged.
After the engineering pile foundation construction is accomplished, can close down part precipitation well 1, reduce precipitation time and influence basin, but recharge well 4 must not be closed easily according to monitoring water level situation subregion.Whole precipitation recharge system should load that superstructure applied greater than groundwater effect behind the buoyancy of basement, can stop.After recharge well 4 stops to recharge, should seal immediately, prevent the infiltration of foundation ditch inner bottom plating.
Above method is through repeatedly using; Final conclusion is after the operation of precipitation recharge system, engineering piles and basement main structure construction, the main structure construction of annex part; Accomplish until the backfill earthwork of the basement outside; During the whole construction, the foundation ditch monitoring is stable, and big distortion does not appear in the outer road of foundation ditch, building.In engineering pile foundation construction period, groundwater table maintains designated water level in the foundation ditch, creates favorable conditions to engineering construction especially.Simultaneously, the outer underground stable level of foundation ditch creates that for the safety of outer road of foundation ditch and building powerful guarantee being provided in police circles' line.
Deep foundation pit construction under the complex environment is on the increase along with the raising of national economy, deep foundation pit precipitation construction dominate in deep foundation pit construction, and it is controlling the safety of construction speed and Foundation Design.Reasonably design is the successful key of construction with the first-class well quality that becomes.The foundation ditch water yield is feasible under the artesian water effect through calculating, and can confirm well depth, well number exactly.Reasonably mentality of designing and well pattern are the important steps of precipitation cost control.Dewatering construction must be taken into consideration with the moisturizing construction, and through the effect of head concora crush, the outer underground stable level of control foundation ditch prevents that outer road of foundation ditch and building from sinking because of WATER LEVEL CHANGES causes cracking, thereby guarantees the safety of deep foundation pit construction process.

Claims (1)

1. adopt precipitation to recharge the job practices of control deep foundation ditch periphery sedimentation, implementation step is:
1. through calculating the foundation ditch water yield under the artesian water effect, accurately confirm the quantity and the precipitation depth of foundation pit dewatering well, and guarantee into the construction quality of well;
2. survey report through ground, confirm the aquifer and the pervious layer of the outer soil layer of foundation ditch, and calculate the target soil layer of moisturizing, adopt the method for off-angle drilling in the foundation ditch, steel sleeve is sent into the target soil layer;
3. at the foundation ditch top high level cistern is set, and with the high level cistern delivery port with recharge well head and link to each other, after the precipitation in the foundation ditch is evacuated to high level cistern with high-pressure pump, utilize high-order pressure with hydraulic pressure to recharge well and arrive the target soil layer that recharges.
CN2010102687392A 2010-08-27 2010-08-27 Construction method by adopting dewatering and water recharging to control sedimentation surrounding deep foundation pit Pending CN102383412A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102644291A (en) * 2012-04-10 2012-08-22 广东金辉华集团有限公司 Foundation pit precast concrete pipe immersed-tube precipitation structure and precipitation method
CN102787611A (en) * 2012-08-10 2012-11-21 中国二冶集团有限公司 Precipitation method for excavation of foundation pit at collapsible loess region
CN102926392A (en) * 2012-10-15 2013-02-13 中国建筑第六工程局有限公司 Foundation pit dewatering system and construction method thereof
CN103088836A (en) * 2012-12-15 2013-05-08 天津大学 Sedimentation control method for pumping water and performing reinjection in well casing simultaneously
CN103526780A (en) * 2013-10-23 2014-01-22 天津大学 Water plugging seepage-proofing method for recharge well
CN103790150A (en) * 2014-01-20 2014-05-14 天津大学 Settlement control method based on twin-well combined type recharge
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
CN106812147A (en) * 2017-01-25 2017-06-09 济南轨道交通集团有限公司 A kind of sand-pebble layer protects spring inverted well construction method
CN108062447A (en) * 2017-12-23 2018-05-22 北京地矿工程建设有限责任公司 A kind of method predicted diving precipitation and influenced on building settlement
CN108090291A (en) * 2017-12-23 2018-05-29 北京地矿工程建设有限责任公司 A kind of computational methods for predicting artesian water suspended cutoff Pit Discharge
CN108133108A (en) * 2017-12-23 2018-06-08 北京地矿工程建设有限责任公司 A kind of method predicted artesian water precipitation and influenced on building settlement
CN108589752A (en) * 2018-04-26 2018-09-28 青岛新华友建工集团股份有限公司 Shallow source perched water green construction recycling construction

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CN101608445A (en) * 2009-07-10 2009-12-23 上海隧道工程股份有限公司 A kind of engineering underground raw water recharging method

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CN1492110A (en) * 2002-09-13 2004-04-28 郑鸿彰 Design and construction method of novel man-hole pile
JP2005002659A (en) * 2003-06-11 2005-01-06 East Japan Railway Co Groundwater circulation system in excavation of ground, and construction method for measure against groundwater in excavation of ground
JP2005248632A (en) * 2004-03-05 2005-09-15 Kanpai Co Ltd Liquid injection method, recharge method and chemical grouting method
JP2006077567A (en) * 2004-08-12 2006-03-23 East Japan Railway Co Recharge method, its water pouring control method, and water pouring control system
CN101608445A (en) * 2009-07-10 2009-12-23 上海隧道工程股份有限公司 A kind of engineering underground raw water recharging method

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102644291A (en) * 2012-04-10 2012-08-22 广东金辉华集团有限公司 Foundation pit precast concrete pipe immersed-tube precipitation structure and precipitation method
CN102644291B (en) * 2012-04-10 2014-08-27 广东金辉华集团有限公司 Foundation pit precast concrete pipe immersed-tube precipitation structure and precipitation method
CN102787611A (en) * 2012-08-10 2012-11-21 中国二冶集团有限公司 Precipitation method for excavation of foundation pit at collapsible loess region
CN102926392A (en) * 2012-10-15 2013-02-13 中国建筑第六工程局有限公司 Foundation pit dewatering system and construction method thereof
CN103088836A (en) * 2012-12-15 2013-05-08 天津大学 Sedimentation control method for pumping water and performing reinjection in well casing simultaneously
CN103526780A (en) * 2013-10-23 2014-01-22 天津大学 Water plugging seepage-proofing method for recharge well
CN103790150A (en) * 2014-01-20 2014-05-14 天津大学 Settlement control method based on twin-well combined type recharge
CN103790150B (en) * 2014-01-20 2015-04-08 天津大学 Settlement control method based on twin-well combined type recharge
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
CN104594326B (en) * 2015-01-13 2016-04-13 济南轨道交通集团有限公司 Spring recharge well and method are protected in a kind of pressurization
CN106812147A (en) * 2017-01-25 2017-06-09 济南轨道交通集团有限公司 A kind of sand-pebble layer protects spring inverted well construction method
CN106812147B (en) * 2017-01-25 2019-11-22 济南轨道交通集团有限公司 A kind of sand-pebble layer guarantor spring inverted well construction method
CN108062447A (en) * 2017-12-23 2018-05-22 北京地矿工程建设有限责任公司 A kind of method predicted diving precipitation and influenced on building settlement
CN108090291A (en) * 2017-12-23 2018-05-29 北京地矿工程建设有限责任公司 A kind of computational methods for predicting artesian water suspended cutoff Pit Discharge
CN108133108A (en) * 2017-12-23 2018-06-08 北京地矿工程建设有限责任公司 A kind of method predicted artesian water precipitation and influenced on building settlement
CN108090291B (en) * 2017-12-23 2021-02-23 北京地矿工程建设有限责任公司 Calculation method for predicting water inflow of confined water suspended curtain foundation pit
CN108062447B (en) * 2017-12-23 2021-08-10 北京地矿工程建设有限责任公司 Method for predicting influence of diving precipitation on building settlement
CN108589752A (en) * 2018-04-26 2018-09-28 青岛新华友建工集团股份有限公司 Shallow source perched water green construction recycling construction

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