CN107460885A - A kind of relief well of deep foundation pit and its construction method - Google Patents
A kind of relief well of deep foundation pit and its construction method Download PDFInfo
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- CN107460885A CN107460885A CN201710868471.8A CN201710868471A CN107460885A CN 107460885 A CN107460885 A CN 107460885A CN 201710868471 A CN201710868471 A CN 201710868471A CN 107460885 A CN107460885 A CN 107460885A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
Abstract
The invention provides a kind of relief well of deep foundation pit and its construction method, the relief well of deep foundation pit includes well bore, the wall casing being arranged in the well bore, and is arranged at the back cover plate of the borehole wall bottom of the tube；Filter layer and packed layer are additionally provided between the outer wall of the hole wall of the well bore and the wall casing, the well bore sequentially passes through first water barrier, the artesian aquifer, second water barrier and the water table aquifer from the bottom to top, and the wall casing runs through the well bore in the axial direction.So, the relief well of deep foundation pit reduces the buying difficulty of material, simplifies difficulty of construction, so as to simply and efficiently complete dewatering construction while reliable precipitation processing is provided for deep basal pit.
Description
Technical field
The present invention relates to deep foundation pit precipitation technical field of construction, and in particular to the Novel pressure-reducing well set outside a kind of deep basal pit
The construction method of structure and the relief well of deep foundation pit.
Background technology
With developing rapidly for national economy and urban construction, the heavy construction such as skyscraper, bridge and subway engineering is big
Amount is built, and in order to ensure structural stability, heavy construction is more using deep basal pit basis.Artesian water refers to riddle two water barriers
Between water-bearing layer in water, its head height should apparently higher than base roof plate height.When under foundation ditch with the presence of artesian aquifer
When, excavation pit reduces water-bearing layer overlying impermeable stratum thickness, when it reduce to a certain extent, the head pressure with artesian water
When can not balance can capping or the base plate of foundation pit that destroys by rush of water, cause it is prominent emerge in large numbers as.It can be seen that when foundation depth is deeper, work progress
Need to carry out precipitation processing for foundation ditch, the setting of rational relief well is successfully crucial containing artesian aquifer deep foundation pit precipitation.
Therefore it provides a kind of relief well of deep foundation pit, to while reliable precipitation processing is provided for deep basal pit, reduce material
The buying difficulty of material, simplify difficulty of construction, so as to simply and efficiently complete dewatering construction, just turn into those skilled in the art urgently
Solve the problems, such as.
The content of the invention
It is an object of the invention to provide a kind of relief well of deep foundation pit, to provide the same of reliable precipitation processing for deep basal pit
When, the buying difficulty of material is reduced, simplifies difficulty of construction, so as to simply and efficiently complete dewatering construction.Another mesh of the present invention
Be to provide a kind of construction method of above-mentioned relief well of deep foundation pit.
In order to solve the above-mentioned technical problem, the present invention provides a kind of relief well of deep foundation pit, described for for deep foundation pit precipitation
Deep basal pit includes the first water barrier, artesian aquifer, the second water barrier and water table aquifer successively from the bottom to top；The relief well of deep foundation pit
Including well bore, the wall casing being arranged in the well bore, and it is arranged at the back cover plate of the borehole wall bottom of the tube；The drilling well
Filter layer and packed layer are additionally provided between the outer wall of the hole wall in hole and the wall casing, the well bore passes through successively from the bottom to top
First water barrier, the artesian aquifer, second water barrier and the water table aquifer, the wall casing is worn to pass through in the axial direction
Wear the well bore.
Further, the filter layer includes filter screen and filter pipe, and the filter pipe is sheathed on the outside of the wall casing,
The filter screen fits in the outer wall of the filter pipe, and some filter openings are offered on the tube wall of the filter pipe.
Further, the packed layer includes filter material layer and sealing of hole layer, and the filter material layer sequentially passes through described from the bottom to top
First water barrier and the artesian aquifer, the sealing of hole layer sequentially pass through second water barrier and the diving from the bottom to top
Layer.
Further, in addition to casing, the casing are sheathed on the periphery of the wall casing, and are arranged at the diving
Layer.
Further, the depth of the well bore be 51 meters, its a diameter of 700mm, the wall casing be diameter of phi 325 ×
5mm welded tubes, the filter pipe are that the opening diameter of filter opening described in Φ 325 × 5mm welded tubes is 40mm, percent opening 12%, the filter
The bed of material is the millet stone that diameter is less than 5mm, and the sealing of hole layer is mud ball or clay ball, and the casing is diameter 820mm steel pipes.
Further, the filter screen includes the first filter mesh layer and the second filter mesh layer, and first filter mesh layer is 40 mesh iron wires
Net, second filter mesh layer are 40 mesh safety nets.
The present invention also provides a kind of construction method of relief well of deep foundation pit as described above, comprises the following steps：
Construction survey：Field survey deep basal pit depth, diving layer depth, water proof layer depth and artesian aquifer depth；
Set casing：Crane lifting pile monkey rapping of shaking puts steel in casing water table aquifer predetermined depth, and is adjusted using locating rack
The plan-position of whole casing and perpendicularity；
Drilling：Using convolution rig, and the drilling construction technique being combined using direct circulation and gas lift reverse circulation, use are swollen
Moisten soil mud；
Borehole cleaning：Mud density is set to be down to 1.10, bottom hole is heavy to become silted up<30cm, the mud returned out are interior without untill clod；
Well casing prepares and down tube：Chimney filter manually cuts hole, parcel screen pack in back court, often saves well casing and sets positioning bar and hang
Ear, merogenesis processing and decentralization, between well casing connection is welded using sleeve pipe and up and down between section well casing；
Fill anti-filter pellet and sealing of hole material：Filler bottom artesian aquifer fills handstone, and top water table aquifer fills clay ball
Or mud ball, two meters of water barrier need to be entered by filling handstone；
Well-flushing：Carried out using air compressor machine and suction pump, untill water is free of sand clearly；
The facility that draws water is installed；
Precipitation is run；
Water level recovers；
Shut-in well：Shunt in a well using back-up sand in well casing；
Tube drawing：Pulled out using the crane lifting pile monkey that shakes.
It is deep foundation pit precipitation that relief well of deep foundation pit provided by the present invention, which is used for, the relief well of deep foundation pit including well bore,
The wall casing being arranged in the well bore, and it is arranged at the back cover plate of the borehole wall bottom of the tube；The hole wall of the well bore with
Filter layer and packed layer are additionally provided between the outer wall of the wall casing, the well bore sequentially passes through described first from the bottom to top
Water barrier, the artesian aquifer, second water barrier and the water table aquifer, the wall casing run through the drilling well in the axial direction
Hole.
The construction of the relief well is relatively simple, can realize assembling and construction in job location, and take full advantage of geology knot
The effective underground water isolated in water table aquifer is expected in structure feature, the hole by filling out envelope in packed layer, and by filter layer
Filtrate ensure that the water rate of artesian aquifer；And wall casing and the selectable material of filter pipe are wide, the rigidity of structure is big, is adapted to deep-well
Construction, the overall structure of relief well is easy to maintain, service life length, and well casing and filler etc. are engineering conventional material, are easy to adopt
Purchase and processing, are especially suitable for emergency work of speedily carrying out rescue work, and simple into well and precipitation apparatus, and simple operation, cost is low, into well yield
Greatly, precipitation efficiency is high.So, the relief well of deep foundation pit reduces material while reliable precipitation processing is provided for deep basal pit
Difficulty is purchased, simplifies difficulty of construction, so as to simply and efficiently complete dewatering construction.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of embodiment of relief well of deep foundation pit provided by the present invention；
Fig. 2 is a kind of technique stream of embodiment of the construction method provided by the present invention for relief well of deep foundation pit
Cheng Tu.
Description of reference numerals：
1- wall casings
2- filter pipes
3- filter screens
4- back cover plates
5- filter material layers
6- sealing of hole layers
7- casings
A- the first water barrier B- artesian aquifers C- the second water barrier D- water table aquifers
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is refer to, Fig. 1 is a kind of structural representation of embodiment of relief well of deep foundation pit provided by the present invention
Figure.
In a kind of embodiment, it is deep foundation pit precipitation that relief well of deep foundation pit provided by the present invention, which is used for, the depth
Foundation ditch is used in skyscraper, bridge or other heavy constructions, and it can be related to each layer of earth's surface, i.e., deep base because depth is deeper
Hole includes the first water barrier A, artesian aquifer B, the second water barrier C and water table aquifer D successively from the bottom to top；Matched with the deep basal pit
Relief well is arranged on the side of deep basal pit, for including well bore for water drainage of deep foundation pit precipitation, the relief well, being arranged at the brill
Wall casing 1 in wellhole, and it is arranged at the back cover plate 4 of the bottom of wall casing 1；The hole wall of the well bore and the wall casing
Filter layer and packed layer are additionally provided between 1 outer wall.In order to ensure precipitation ability, the depth of well bore should be with deep basal pit
Depth matches, and the well bore sequentially passes through the first water barrier A, the artesian aquifer B, second water proof from the bottom to top
The layer C and water table aquifer D, specifically, the depth of the well bore is 51 meters, its a diameter of 700mm.The wall casing 1 is in axial direction
Upper to run through the well bore, wall casing 1 is arranged on the interior well bore to drill out of well bore and provides lateral support, avoids well bore from collapsing
Collapse, specifically, the wall casing 1 is diameter of phi 325 × 5mm welded tubes.In work progress, brill is drilled out by projected depth using rig
Wellhole, and tripping in wall casing 1 is supported in backward well bore, and filter layer is set gradually between wall casing 1 and the hole wall of well bore
And packed layer, and with back cover plate 4 by the bottom package of wall casing 1, completely cut off bottom water, hold the water in water layer and enter after filtering and bore
In wellhole, completion precipitation is constantly extracted out using water pump.
Specifically, above-mentioned filter layer includes filter screen 3 and filter pipe 2, and the filter pipe 2 is sheathed on the outer of the wall casing 1
Side, the filter screen 3 fit in the outer wall of the filter pipe 2；Some filter openings are offered on the tube wall of the filter pipe 2, filter opening has
It is multiple, can be circular, triangle or square etc., multiple filter openings form several filter opening groups, multiple filters in each filter opening group
Hole is rounded or quincunx distribution, by the double filtration of filter pipe 2 and filter screen 3, avoids the impurities in water extracted out excessive, improves
The recycling ability of the moisture of extraction；The filter pipe 2 is Φ 325 × 5mm welded tubes, and the opening diameter of filter opening is 40mm, perforate
Rate 12%.In order to improve filter capacity, the filter screen 3 includes 3 layers of 3 layers of the first filter screen and the second filter screen, 3 layers of first filter screen
For 40 mesh wire nettings, 3 layers of second filter screen is 40 mesh safety nets.
In order to avoid the soil layer between tube wall caves in, packed layer, packed layer bag should be set between wall casing 1 and well bore
Filter material layer 5 and sealing of hole layer 6 are included, the filter material layer 5 sequentially passes through the first water barrier A and the artesian aquifer B from the bottom to top,
The sealing of hole layer 6 sequentially passes through the second water barrier C and the water table aquifer D from the bottom to top.Wherein, the filter material layer 5 is straight
Footpath is less than 5mm millet stone, and the sealing of hole layer 6 is mud ball or clay ball.
Further, in order to ensure the intensity of well bore, drilling process is avoided to be caved in into soil layer occurs, the relief well also wraps
Casing 7 is included, the casing 7 is sheathed on the periphery of the wall casing 1, and is arranged at the water table aquifer D, and the casing 7 is diameter
820mm steel pipes.
The construction of relief well of deep foundation pit provided by the present invention is relatively simple, can realize assembling and construction in job location,
And geologic structure feature is taken full advantage of, the effective underground isolated in water table aquifer D is expected in the hole by filling out envelope in packed layer
Water, and ensure that by the filtrate in filter layer artesian aquifer B water rate；And 2 selectable material of wall casing 1 and filter pipe
Extensively, the rigidity of structure is big, is adapted to deep-well construction, and the overall structure of relief well is easy to maintain, service life length, and well casing and filler etc. are equal
For engineering conventional material, it is easy to purchase and processes, is especially suitable for emergency work of speedily carrying out rescue work, and, operation simple into well and precipitation apparatus
Convenient, cost is low, into well yield is big, precipitation efficiency is high.So, the relief well of deep foundation pit is providing reliable precipitation for deep basal pit
While processing, the buying difficulty of material is reduced, simplifies difficulty of construction, so as to simply and efficiently complete dewatering construction.
Except above-mentioned relief well of deep foundation pit, the present invention also provides a kind of construction method of the relief well of deep foundation pit, such as Fig. 2 institutes
Show, this method comprises the following steps：
S101- construction surveys：Field survey deep basal pit depth, water table aquifer D depth, water proof layer depth and artesian aquifer B are deep
Degree；
S102- sets casing 7：Crane lifting pile monkey rapping of shaking squeezes into casing 7 in water table aquifer D predetermined depths, and uses
The plan-position of locating rack adjustment casing 7 and perpendicularity；
S103- drills：Using the rig that circles round, and the drilling construction technique being combined using direct circulation and gas lift reverse circulation,
Using bentonite mud；
S104- borehole cleanings：Mud density is set to be down to 1.10, bottom hole is heavy to become silted up<30cm, the mud returned out are interior without untill clod；
S105- well casings prepare and down tube：Chimney filter manually cuts hole, parcel screen pack 3 in back court, often saves well casing and sets positioning bar
And hanger, merogenesis processing and decentralization, between well casing connection is welded using sleeve pipe and up and down between section well casing；
S106- fills anti-filter pellet and sealing of hole material：Filler bottom artesian aquifer B fills handstone, and top water table aquifer D is filled
Clay ball or mud ball, two meters of water barrier need to be entered by filling handstone；
S107- well-flushings：Carried out using air compressor machine and suction pump, untill water is free of sand clearly；
S108- installs the facility that draws water；
S109- precipitation is run；
S110- water levels recover；
S111- shunts in a well：Shunt in a well using back-up sand in well casing；
S112- tube drawings：Pulled out using the crane lifting pile monkey that shakes.
The relief well construction technological process includes：Construction survey → set 7 → drill hole of drilling machine of casing → borehole cleaning → well casing system
Standby and down tube → filling anti-filter pellet → fill sealing of hole material → well-flushing → installation draw water facility → precipitation operation → water level recover →
Shut-in well → tube drawing.
Wherein, steel pile casting 7 is shaken pile monkey rapping using crane lifting, and plan-position and perpendicularity are adjusted using locating rack；Bore
Machine selection convolution rig, the drilling construction technique that drilling construction is combined using direct circulation and gas lift reverse circulation, using bentonite
Mud processed；Borehole cleaning makes mud density be down to 1.10, and bottom hole is heavy to become silted up<30cm, the mud returned out are interior without untill clod；Chimney filter is rear
Field is artificial to cut hole, parcel screen pack 3, often saves well casing and sets positioning bar and hanger, and merogenesis is processed and decentralization, connects and uses between well casing
Welded between sleeve pipe, with section well casing up and down；Well-flushing is carried out using air compressor machine and suction pump, untill water is free of sand clearly；Filler bottom
Portion artesian aquifer B fills handstone, and top water table aquifer D fills clay ball or mud ball, and water barrier two need to be entered by filling handstone
Rice；Shut-in well is using back-up sand in well casing；Well casing is pulled out to pull out using the crane lifting pile monkey that shakes.
Using relief well of deep foundation pit made of this kind of technique material can periphery buying, chimney filter can process voluntarily, engineering institute
Welded tube, steel plate, filter screen 3, small crushed stone and other auxiliary materials needed are all engineering common used material, convenient to be purchased from Around, even if
In more underdeveloped foreign locale, also it is easier to purchase from periphery, chimney filter uses the welded tube scene system of cutting, therefore material structure is fast；
Drilling equipment utilizing works are commonly used or existing drilling equipment, and drilling equipment uses the churning driven of engineering pile foundation drilling construction, convolution
Rig or impact drill, equipment are often that equipment has been marched into the arena or had by oneself to engineering, and personnel and equipment tissue are convenient, personnel are skilled in technique,
Construction speed is fast；Also, well casing recoverable, after the completion of precipitation, using shaking, pile monkey is pulled out with crane to well casing, well
Tube material is repeatable to be utilized；In summary, construction method construction organization provided by the present invention is simple, production efficiency is high, precipitation
Operational effect is good, service life length, and cost input is low, applied widely.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (7)
- A kind of 1. relief well of deep foundation pit, for including the first water barrier successively from the bottom to top for deep foundation pit precipitation, the deep basal pit (A), artesian aquifer (B), the second water barrier (C) and water table aquifer (D)；Characterized in that, the relief well of deep foundation pit includes drilling well Hole, the wall casing (1) being arranged in the well bore, and it is arranged at the back cover plate (4) of the wall casing (1) bottom；The brill Filter layer and packed layer are additionally provided between the outer wall of the hole wall of wellhole and the wall casing (1), the well bore is from the bottom to top Sequentially pass through first water barrier (A), the artesian aquifer (B), second water barrier (C) and the water table aquifer (D), institute State wall casing (1) and run through the well bore in the axial direction.
- 2. relief well of deep foundation pit according to claim 1, it is characterised in that the filter layer includes filter screen (3) and filter pipe (2), the filter pipe (2) is sheathed on the outside of the wall casing (1), and the filter screen (3) fits in the outer of the filter pipe (2) Wall, some filter openings are offered on the tube wall of the filter pipe (2).
- 3. relief well of deep foundation pit according to claim 2, it is characterised in that the packed layer includes filter material layer (5) and sealing of hole Layer (6), the filter material layer (5) sequentially pass through first water barrier (A) and the artesian aquifer (B), the envelope from the bottom to top Aperture layer (6) sequentially passes through second water barrier (C) and the water table aquifer (D) from the bottom to top.
- 4. relief well of deep foundation pit according to claim 3, it is characterised in that be also arranged including casing (7), the casing (7) In the periphery of the wall casing (1), and it is arranged at the water table aquifer (D).
- 5. relief well of deep foundation pit according to claim 4, it is characterised in that the depth of the well bore is 51 meters, its diameter For 700mm, the wall casing (1) is diameter of phi 325 × 5mm welded tubes, and the filter pipe (2) is filter described in Φ 325 × 5mm welded tubes The opening diameter in hole is 40mm, percent opening 12%, and the filter material layer (5) is the millet stone that diameter is less than 5mm, the sealing of hole layer (6) it is mud ball or clay ball, the casing (7) is diameter 820mm steel pipes.
- 6. relief well of deep foundation pit according to claim 5, it is characterised in that the filter screen (3) include the first filter screen (3) layer and Second filter screen (3) layer, the first filter screen (3) layer are 40 mesh wire nettings, and the second filter screen (3) layer is 40 mesh safety nets.
- 7. the construction method of a kind of relief well of deep foundation pit as described in claim any one of 1-6, it is characterised in that including following Step：Construction survey：Field survey deep basal pit depth, diving layer depth, water proof layer depth and artesian aquifer (B) depth；Set casing (7)：Crane lifting pile monkey rapping of shaking squeezes into casing (7) in water table aquifer (D) predetermined depth, and using positioning The plan-position of frame adjustment casing (7) and perpendicularity；Drilling：Using the rig that circles round, and the drilling construction technique being combined using direct circulation and gas lift reverse circulation, using bentonite Mud processed；Borehole cleaning：Mud density is set to be down to 1.10, bottom hole is heavy to become silted up<30cm, the mud returned out are interior without untill clod；Well casing prepares and down tube：Chimney filter manually cuts hole, parcel screen pack (3) in back court, often saves well casing and sets positioning bar and hanger, Merogenesis is processed and decentralization, and connection uses between well casing welds between sleeve pipe and up and down section well casing；Fill anti-filter pellet and sealing of hole material：Handstone is filled in filler bottom artesian aquifer (B), and top water table aquifer (D) fills clay Ball or mud ball, two meters of water barrier need to be entered by filling handstone；Well-flushing：Carried out using air compressor machine and suction pump, untill water is free of sand clearly；The facility that draws water is installed；Precipitation is run；Water level recovers；Shut-in well：Shunt in a well using back-up sand in well casing；Tube drawing：Pulled out using the crane lifting pile monkey that shakes.
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| CN201710868471.8A CN107460885A (en) | 2017-09-22 | 2017-09-22 | A kind of relief well of deep foundation pit and its construction method |
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Cited By (6)
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| CN108867651A (en) * | 2018-07-26 | 2018-11-23 | 江苏兴厦建设工程集团有限公司 | A kind of pervious concrete well casing mounting device for base pit dewatering |
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| CN110130379A (en) * | 2019-05-28 | 2019-08-16 | 中亿丰建设集团股份有限公司 | The recovery method of dewatering well |
| CN110144919A (en) * | 2019-05-30 | 2019-08-20 | 中冶建工集团有限公司 | Embed-type precipitation joint construction method |
| CN110905403A (en) * | 2019-12-09 | 2020-03-24 | 中冶集团武汉勘察研究院有限公司 | Construction method of large-diameter groundwater environment monitoring well |
| CN113216198A (en) * | 2021-06-02 | 2021-08-06 | 上海兴怡基础工程有限公司 | Well sealing method for relief well of foundation pit large bottom plate |
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| CN110130379A (en) * | 2019-05-28 | 2019-08-16 | 中亿丰建设集团股份有限公司 | The recovery method of dewatering well |
| CN110144919A (en) * | 2019-05-30 | 2019-08-20 | 中冶建工集团有限公司 | Embed-type precipitation joint construction method |
| CN110905403A (en) * | 2019-12-09 | 2020-03-24 | 中冶集团武汉勘察研究院有限公司 | Construction method of large-diameter groundwater environment monitoring well |
| CN113216198A (en) * | 2021-06-02 | 2021-08-06 | 上海兴怡基础工程有限公司 | Well sealing method for relief well of foundation pit large bottom plate |
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