CN104032760A - Foundation pit construction tube well dewatering method - Google Patents

Foundation pit construction tube well dewatering method Download PDF

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Publication number
CN104032760A
CN104032760A CN201310068635.0A CN201310068635A CN104032760A CN 104032760 A CN104032760 A CN 104032760A CN 201310068635 A CN201310068635 A CN 201310068635A CN 104032760 A CN104032760 A CN 104032760A
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well
foundation pit
tube
construction
wells
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CN201310068635.0A
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李孝虎
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李孝虎
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Abstract

The invention relates to a tube well dewatering method of a deep well. The disposition is arranged on positions which are 1.5m from the periphery of a foundation pit and around the foundation pit, a row of tube wells are arranged on each of left and right sides of the foundation pit, three wells are arranged on each side, and the number of the arranged tube wells can be increased or decreased according to effects of rainfall. The distance from the centers of the wells to the sideline of a building is 1.5m, the distance between wells is 7m, the wellhead diameter is 600mm, well tubes are mounted in sections and removed in sections to positions 30cm above an excavation face with the excavation of the foundation pit, and the normal water level the of wells is controlled to be in the height lower than 48.0m during structural construction so as to ensure that the underground water level of the soil is 0.5m lower than the bottom surface of the foundation pit. The construction steps include well position lofting, wellhead making and pile casing mounting, drilling machine placing and drilling, well bottom sand cushion backfilling, well tube lifting and arranging, backfilling of filter layers between tube walls and hole walls, water pumping control circuit mounting, trial water pumping and normal operations of dewatering wells. The foundation pit construction tube well dewatering method aims at performing basic construction in areas of high underground water levels, reducing the underground water levels and providing a dry working environment for foundation structure construction.

Description

A kind of foundation pit construction tube well dewatering method
Technical field
The present invention relates to construction of hydro project technical field, be specially a kind of foundation pit construction tube well dewatering method.
Background technology
For guaranteeing foundation pit construction, the safety of main body underground structure and supporting and protection structure, precipitation and soil excavation and the backfill that surrounding environment is without prejudice and takes, comprise prospecting, design, construction, monitoring and detection etc., being called base pit engineering, is a comprehensive very strong system engineering.Base pit engineering is an ancient traditional subject in soil mechanics Foundation Design, again a comprehensive geotechnical engineering problems simultaneously, both related to typical intensity in soil mechanics, stablize and problem on deformation, also relate to the acting in conjunction problem of soil and supporting and protection structure along with the excavation of foundation ditch is more and more darker simultaneously, area is increasing, design and the construction of foundation pit enclosure structure become increasingly complex, needed theory and technology is more and more higher, surmounted the category as construction ancillary method far away, it is stable that unit in charge of construction does not have enough technical forces to solve complicated foundation ditch, distortion and environmental protection problem, the intervention of research and designing unit has solved the theory of base pit engineering and has calculated and design problem, progressively formed thus that an independently subject branch---base pit engineering deep-foundation pit engineering relates to Structural Engineering, numerous ambits such as geotechnical engineering and Environmental Engineering, comprehensive height, influence factor is many, design calculation theory is also immature, also depend on to a certain extent engineering experience.The construction technology of pit earthwork excavation generally has two kinds: put slope excavation (non-support excavation) and excavation (having supporting excavation) under support system protection.The former not only simply but also economical but need possess the condition of putting slope excavation, outside the not too dark and foundation ditch plane of foundation ditch, has enough this use of Gong Fang slope, space.Therefore, in open territory or surrounding environment allow to put slope and can guarantee and should preferentially select under stability of slope condition.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, adopt and carry out foundation construction in the higher area of groundwater table, dewatering, is crucial for foundation structure construction provides a dry operating environment.
To achieve these goals, the present invention realizes by the following technical solutions:
Deep-well tube well dewatering construction method of the present invention, for arranging apart from foundation ditch outer rim 1.5m along foundation ditch, respectively arranges a comb well at foundation ditch left and right sides around, and every side is arranged 3 mouthfuls of wells, and pipe well arranges that quantity increases or reduces according to the effect of precipitation.Well centre distance building sideline is 1.5m, well spacing is 7m, well head diameter is 600mm, well casing merogenesis is installed, with excavation of foundation pit, remove section by section to the above 30cm of excavation face, during structure construction, in well, ordinary water level elevation is controlled at below 48.0m, to guarantee that soil body groundwater table is lower than foundation ditch bottom surface 0.5m.Concrete construction method:
1, construction sequence well location setting-out → do well head, Hospice Center's cylinder → rig are in place, the take out → dewatering well of filtration beds → installation pumping control circuit → examination of boring → backfill shaft bottom sand cushion → hang between well casing → backfill tube wall and hole wall is normally worked
2, pore-forming adopts XY-600 type drilling equipment drilling.Diameter 600mm tri-leaves or four taper bits, one-step pore-creating are selected by designing requirement in aperture.Supporting water pump is BWT450/12 slush pump, and maximum working pressure (MWP) is not less than 1.2MPa, and defeated slurry amount is not less than 5L/S, and drillability is controlled at 2.5~4m/h, at argillic horizon, can, from pulping, enter sandy soil layer and adopt the qualified mud of mud pit.The strict mud balance 1.1 to 1.2 of controlling, mud viscosity 18~20 seconds, sand content is less than 5.0%, and the proportion that boring is flowed out certainly, 1.2~1.3, enters low level pond after the precipitation filter of high-order pond, qualifiedly after testing can be pumped into boring circulation.
3, deep shaft system equipment well casing: adopt concrete well casing, well casing internal diameter φ 300mm, pipe thickness 50mm, the sediment tube that its underpart is 1.0m, top is sand concrete free chimney filter.Water pump: 1 150QJ20-26/4 moldeed depth well pump of configuration in every mouthful of deep-well, a gauge tap of every water pump configuration.
4, hang well casing, filtrate backfill and clay sealing for keeping boring concentric with well casing, well outer wall colligation guiding wooden unit, drilling cramp does not move, and with former drilling cramp lifting concrete pipe, after elevation at the bottom of complexor hole is errorless, fills in record.Bottom first configures a joint concrete blind pipe, pulls and hangs, slowly in downcast hole, until desired depth with hardwood pallet with wire rope.On blind pipe, connect chimney filter, to good tongue and groove, outer wall bag one deck 80 order nylon filtering cloths, two union 200mm, with nonwoven wrapping, use 3 ~ 4 bamboo plates vertically fixing again outside it, with 10# galvanized wire banding, manage outer backfill medium coarse sand.
5, after hole flushing, the well casing that draws water install, should carry out immediately hole flushing, permit of no delay.After well-flushing, water yield reaches requirement, starts formally to draw water, and surveys note groundwater table by peephole.Analysis limit, measurement limit, Cheng Jing limit, limit improvement limit Jia Jing, requires water level until Water Level in Foundation Pit drops to.
6, shunt in a well this engineering after foundation structure has been constructed, through supervising engineer's approval, start the shut-in well of stop pumping in an orderly manner, ensure quality, does not stay hidden danger.In order to guarantee shutoff safety, before opening, first use gravel backfill, top 0.5m fills out clay compacting.
Beneficial effect of the present invention is to adopt and carries out foundation construction in the higher area of groundwater table, and dewatering, for foundation structure construction provides a dry operating environment.Supporting and protection structure, precipitation and the soil excavation and the backfill that guarantee the safety of foundation pit construction, main body underground structure and surrounding environment to be without prejudice and take, comprise prospecting, design, construction, monitoring and detection etc., is a comprehensive very strong system engineering.
The specific embodiment
In conjunction with Gansu construction works, be described further.
Example one, a kind of foundation pit construction tube well dewatering method
1, project profile and geological condition Deep Foundation Pit excavation soil property are mainly cohesive soil, and excavation slope is 1:3, and according to the above actual conditions in job site, excavation slope is not carried out supporting.The draining of falling of foundation ditch is that excavation of foundation pit is crucial, before excavation, answers dewatering, makes it lower than excavation face 0.5m, forbids disturbance natural ground, the reserved 30cm thickness topping in foundation ditch bottom.Foundation pit dewatering mainly adopts gutter drainage and tube well dewatering.Engineering geology is divided into three layers of upper, middle and lowers: take manually to pile up and banket as main in top, middle part is brick-red reticulate pattern clay, and bottom basement rock be take glutenite as main.
2, material and facilities plan well casing: adopt concrete well casing, well casing internal diameter φ 300mm, pipe thickness 50mm, the sediment tube that its underpart is 1.0m, top is sand concrete free chimney filter.Water pump: 2 22kW slush pumps are used in gutter drainage, 1 150QJ20-26/4 moldeed depth well pump of configuration in every mouthful of deep-well, a gauge tap of every water pump configuration.
3, foundation pit dewatering construction arranges
3.1 construction method excavation slopes are 1:3, and this one-phase earth material water content is moderate, and foundation ditch directly excavates.When the following soil excavation of second stage 52.0m elevation, adopt gutter drainage and pipe well draining; Second stage starts to beat deep-well at 52.0m elevation from the following soil excavation of 52.0m elevation, after cut-off wall construction finishes seven days, start tube well dewatering, to reduce soil body diving, improve the following soil excavation efficiency of groundwater table, for improving dewatering effect, adopt the auxiliary precipitation of mode in gutter simultaneously; Phase III is after excavation of foundation pit finishes, to utilize pipe well well point as collecting well, adopts open drain and pipe well to reduce underground water simultaneously, guarantees that structure construction carries out in nonirrigated farmland.
3.2 gutter drainages arrange that foundation ditch is rectangle, long 50.6m, wide 21m, along with the excavation of foundation ditch, when foundation depth approaches 52.0m, along foundation ditch surrounding (beyond base profile line, in margin of foundation pit toe 0.3m) gutter is set, four jiaos of foundation ditches or every 30 ~ 40m, establish the collecting well that a diameter is 0.8m, ditch bottom width 0.3m, bottom of trench is than the low 0.4m of foundation ditch, at the bottom of collecting well than the low 0.8m in gutter.Along with excavation of foundation pit, gutter and collecting well be classification setting and intensification thereupon, until the end, hole reaches design elevation.Excavation of foundation pit, to desired depth, then is repaired perfectly to gutter and collecting well, furrow bank must utilize masonry laid dry or carry out supporting with permeable sand pocket when unstable.
3.3 tube well dewaterings arrange to take out and fall pipe well and around apart from foundation ditch outer rim 1.5m, arrange along foundation ditch, and at foundation ditch left and right sides, respectively arrange a comb well, every side is arranged 3 mouthfuls of wells, and pipe well arranges that quantity increases or reduces according to the effect of precipitation.Well centre distance building sideline 1.5m, well spacing is 7m, well head diameter is 600mm, well casing merogenesis is installed, with excavation of foundation pit, remove section by section to the above 30cm of excavation face, during structure construction, in well, ordinary water level elevation is controlled at below 48.0m, to guarantee that soil body groundwater table is lower than foundation ditch bottom surface 0.5m.
3.4 deep-well construction methods
3.4.1 construction sequence well location setting-out → do well head, Hospice Center's cylinder → rig are in place, the take out → dewatering well of filtration beds → installation pumping control circuit → examination of boring → backfill shaft bottom sand cushion → hang between well casing → backfill tube wall and hole wall is normally worked
3.4.2 pore-forming adopts XY-600 type drilling equipment drilling.Diameter 600mm tri-leaves or four taper bits, one-step pore-creating are selected by designing requirement in aperture.Supporting water pump is BWT450/12 slush pump, and maximum working pressure (MWP) is not less than 1.2MPa, and defeated slurry amount is not less than 5L/S, and drillability is controlled at 2.5 ~ 4m/h, at argillic horizon, can, from pulping, enter sandy soil layer and adopt the qualified mud of mud pit.The strict mud balance 1.1 to 1.2 of controlling, mud viscosity 18 ~ 20 seconds, sand content is less than 5.0%, and the general proportion flowing out from boring, 1.2 ~ 1.3, enters low level pond after the precipitation filter of high-order pond, qualifiedly after testing can be pumped into boring circulation.
3.4.3 deep shaft system equipment well casing: adopt concrete well casing, well casing internal diameter φ 300mm, pipe thickness 50mm, the sediment tube that its underpart is 1.0m, top is sand concrete free chimney filter.Water pump: 1 150QJ20-26/4 moldeed depth well pump of configuration in every mouthful of deep-well, a gauge tap of every water pump configuration.
3.4.4 hang well casing, filtrate backfill and clay sealing for keeping boring concentric with well casing, well outer wall colligation guiding wooden unit, drilling cramp does not move, and with former drilling cramp lifting concrete pipe, after elevation at the bottom of complexor hole is errorless, fills in record.Bottom first configures a joint concrete blind pipe, pulls and hangs, slowly in downcast hole, until desired depth with hardwood pallet with wire rope.On blind pipe, connect chimney filter, to good tongue and groove, outer wall bag one deck 80 order nylon filtering cloths, two union 200mm, with nonwoven wrapping, use 3 ~ 4 bamboo plates vertically fixing again outside it, with 10# galvanized wire banding, manage outer backfill medium coarse sand.
3.4.5 after hole flushing, the well casing that draws water install, should carry out immediately hole flushing, permit of no delay.After well-flushing, water yield reaches requirement, starts formally to draw water, and surveys note groundwater table by peephole.Analysis limit, measurement limit, Cheng Jing limit, limit improvement limit Jia Jing, requires water level until Water Level in Foundation Pit drops to.
3.4.6 this engineering of shunting in a well, after foundation structure has been constructed, through supervising engineer's approval, starts the shut-in well of stop pumping in an orderly manner, and ensure quality, does not stay hidden danger.In order to guarantee shutoff safety, before opening, first use gravel backfill, top 0.5m fills out clay compacting.

Claims (3)

1. a foundation pit construction tube well dewatering method, is characterized in that
(1), working procedure well location setting-out → do well head, Hospice Center's cylinder → rig are in place, the take out → dewatering well of filtration beds → installation pumping control circuit → examination of boring → backfill shaft bottom sand cushion → hang between well casing → backfill tube wall and hole wall is normally worked;
(2), diameter 600mm tri-leaves or four taper bits are selected by designing requirement in pore-forming aperture, one-step pore-creating, supporting water pump is BWT450/12 slush pump, maximum working pressure (MWP) is not less than 1.2MPa, defeated slurry amount is not less than 5L/S, drillability is controlled at 2.5~4m/h, at argillic horizon, can, from pulping, enter sandy soil layer and adopt the qualified mud of mud pit; The strict mud balance 1.1 to 1.2 of controlling, mud viscosity 18~20 seconds, sand content is less than 5.0%, and the proportion that boring is flowed out certainly, 1.2~1.3, enters low level pond after the precipitation filter of high-order pond, qualifiedly after testing can be pumped into boring circulation;
(3), deep shaft system equipment well casing: adopt concrete well casing, well casing internal diameter φ 300mm, pipe thickness 50mm, the sediment tube that its underpart is 1.0m, top is sand concrete free chimney filter;
(4), hang well casing, filtrate backfill and clay sealing for keeping boring concentric with well casing, well outer wall colligation guiding wooden unit, drilling cramp does not move, and with former drilling cramp, lifts concrete pipe, after elevation at the bottom of complexor hole is errorless, fills in record;
(5), after hole flushing, the well casing that draws water install, should carry out immediately hole flushing, permit of no delay; After well-flushing, water yield reaches requirement, starts formally to draw water;
(6), this engineering of shunting in a well after foundation structure has been constructed, through supervising engineer approval, start the shut-in well of stop pumping in an orderly manner, ensure quality, does not stay hidden danger.In order to guarantee shutoff safety, before opening, first use gravel backfill, top 0.5m fills out clay compacting.
2. a kind of foundation pit construction tube well dewatering method as claimed in claim 1, it is characterized in that for around arranging apart from foundation ditch outer rim 1.5m along foundation ditch, at foundation ditch left and right sides, respectively arrange a comb well, every side is arranged 3 mouthfuls of wells, pipe well arranges that quantity increases or reduces according to the effect of precipitation, well centre distance building sideline is 1.5m, well spacing is 7m, well head diameter is 600mm, well casing merogenesis is installed, with excavation of foundation pit, remove section by section to the above 30cm of excavation face, during structure construction, in well, ordinary water level elevation is controlled at below 48.0m, to guarantee that soil body groundwater table is lower than foundation ditch bottom surface 0.5m.
3. a kind of foundation pit construction tube well dewatering method as claimed in claim 1, is characterized in that: bottom will configure a joint concrete blind pipe, with hardwood pallet, with wire rope, pulls and hangs, slowly in downcast hole, until desired depth connects chimney filter on blind pipe, to good tongue and groove, outer wall bag one deck 80 order nylon filtering cloths, two union 200mm, with nonwoven wrapping, it is outer vertically fixing with 3~4 bamboo plates again, with 10# galvanized wire banding, manage outer backfill medium coarse sand.
CN201310068635.0A 2013-03-05 2013-03-05 Foundation pit construction tube well dewatering method Pending CN104032760A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104762981A (en) * 2015-02-16 2015-07-08 中交一航局第一工程有限公司 Hole forming method of precipitation well
CN104831762A (en) * 2015-04-30 2015-08-12 宁波大学 Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown
CN104947680A (en) * 2015-06-16 2015-09-30 乌海市公路工程有限公司 Method for overwater bearing platform foundation pit excavation construction of quick sand stratum
CN105201000A (en) * 2015-09-28 2015-12-30 中国十七冶集团有限公司 Wide foundation pit precipitation method capable of remotely monitoring
CN106032672A (en) * 2015-12-02 2016-10-19 天津富源水利工程有限公司 Deep ground pit grenade type well pre-sealing precipitation method
CN106988342A (en) * 2017-05-19 2017-07-28 中国水利水电第四工程局有限公司 A kind of underground pipe gallery drainage and construction method
CN107165180A (en) * 2017-06-30 2017-09-15 上海二十冶建设有限公司 A kind of anti-quicksand precipitation method of pipe well
CN107386308A (en) * 2017-07-26 2017-11-24 浙江省工程勘察院 A kind of side slope slopes automate precipitation method
CN107476322A (en) * 2017-08-10 2017-12-15 魏玉建 Well-points dewatering automatic servo compensation technique
CN108867673A (en) * 2018-06-12 2018-11-23 武汉丰达地质工程有限公司 A kind of underwater prevention method in the foundation pit based on the curtain that draws water
CN108894240A (en) * 2018-06-26 2018-11-27 兰州理工大学 Recyclable drainage of foundation pit system and recovery method
CN109577353A (en) * 2018-11-07 2019-04-05 江苏兴厦建设工程集团有限公司 A kind of prefabricated regenerated aggregate concrete downcast well pipe and its construction method
CN109630192A (en) * 2018-10-31 2019-04-16 广州地铁设计研究院股份有限公司 A kind of precipitation method suitable for the construction of half diagenesis bored tunnel
CN109736338A (en) * 2018-12-26 2019-05-10 江苏省水利工程科技咨询股份有限公司 A kind of hydraulic engineering foundation pit pipe well combination light well point Yield rainfall relation method
CN110016924A (en) * 2019-04-23 2019-07-16 华东交通大学 A kind of partition-type base pit dewatering design method considering rainfall recharge
CN110529042A (en) * 2019-08-09 2019-12-03 天津建工城市建设发展有限公司 A kind of forming hole method of dewatering well
CN110872837A (en) * 2019-11-29 2020-03-10 深圳宏业基岩土科技股份有限公司 Construction method for transforming empty pile section of rotary excavating cast-in-place pile into dewatering well
CN111456054A (en) * 2020-04-14 2020-07-28 山东大学 Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method
CN111456053A (en) * 2020-04-15 2020-07-28 江苏中路工程技术研究院有限公司 Construction method for dry operation of ditch and pond
CN111851546A (en) * 2020-06-03 2020-10-30 南通大学 Construction method for sealing precipitation of drainage well in deep foundation pit construction
CN111877377A (en) * 2020-05-26 2020-11-03 中建八局天津建设工程有限公司 Foundation pit dewatering construction method

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104762981A (en) * 2015-02-16 2015-07-08 中交一航局第一工程有限公司 Hole forming method of precipitation well
CN104762981B (en) * 2015-02-16 2016-08-24 中交一航局第一工程有限公司 A kind of forming hole method of dewatering well
CN104831762A (en) * 2015-04-30 2015-08-12 宁波大学 Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown
CN104947680A (en) * 2015-06-16 2015-09-30 乌海市公路工程有限公司 Method for overwater bearing platform foundation pit excavation construction of quick sand stratum
CN105201000A (en) * 2015-09-28 2015-12-30 中国十七冶集团有限公司 Wide foundation pit precipitation method capable of remotely monitoring
CN106032672A (en) * 2015-12-02 2016-10-19 天津富源水利工程有限公司 Deep ground pit grenade type well pre-sealing precipitation method
CN106988342A (en) * 2017-05-19 2017-07-28 中国水利水电第四工程局有限公司 A kind of underground pipe gallery drainage and construction method
CN107165180A (en) * 2017-06-30 2017-09-15 上海二十冶建设有限公司 A kind of anti-quicksand precipitation method of pipe well
CN107386308A (en) * 2017-07-26 2017-11-24 浙江省工程勘察院 A kind of side slope slopes automate precipitation method
CN107476322A (en) * 2017-08-10 2017-12-15 魏玉建 Well-points dewatering automatic servo compensation technique
CN108867673A (en) * 2018-06-12 2018-11-23 武汉丰达地质工程有限公司 A kind of underwater prevention method in the foundation pit based on the curtain that draws water
CN108894240A (en) * 2018-06-26 2018-11-27 兰州理工大学 Recyclable drainage of foundation pit system and recovery method
CN109630192A (en) * 2018-10-31 2019-04-16 广州地铁设计研究院股份有限公司 A kind of precipitation method suitable for the construction of half diagenesis bored tunnel
CN109577353A (en) * 2018-11-07 2019-04-05 江苏兴厦建设工程集团有限公司 A kind of prefabricated regenerated aggregate concrete downcast well pipe and its construction method
CN109736338A (en) * 2018-12-26 2019-05-10 江苏省水利工程科技咨询股份有限公司 A kind of hydraulic engineering foundation pit pipe well combination light well point Yield rainfall relation method
CN110016924A (en) * 2019-04-23 2019-07-16 华东交通大学 A kind of partition-type base pit dewatering design method considering rainfall recharge
CN110529042A (en) * 2019-08-09 2019-12-03 天津建工城市建设发展有限公司 A kind of forming hole method of dewatering well
CN110872837A (en) * 2019-11-29 2020-03-10 深圳宏业基岩土科技股份有限公司 Construction method for transforming empty pile section of rotary excavating cast-in-place pile into dewatering well
CN111456054A (en) * 2020-04-14 2020-07-28 山东大学 Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method
CN111456054B (en) * 2020-04-14 2021-04-30 山东大学 Pipe well structure suitable for high-permeability alluvial stratum, precipitation construction system and precipitation construction method
CN111456053A (en) * 2020-04-15 2020-07-28 江苏中路工程技术研究院有限公司 Construction method for dry operation of ditch and pond
CN111877377A (en) * 2020-05-26 2020-11-03 中建八局天津建设工程有限公司 Foundation pit dewatering construction method
CN111851546A (en) * 2020-06-03 2020-10-30 南通大学 Construction method for sealing precipitation of drainage well in deep foundation pit construction

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