CN110093941A - Deep foundation pit precipitation construction method - Google Patents
Deep foundation pit precipitation construction method Download PDFInfo
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- CN110093941A CN110093941A CN201910338194.9A CN201910338194A CN110093941A CN 110093941 A CN110093941 A CN 110093941A CN 201910338194 A CN201910338194 A CN 201910338194A CN 110093941 A CN110093941 A CN 110093941A
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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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
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- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention provides a kind of deep foundation pit precipitation construction methods, the following steps are included: S1) structure of every mouthful of dewatering well in deep basal pit, design well depth and design position determined according to construction requirement, the quantity of required dewatering well in deep basal pit is calculated, deep foundation pit precipitation well arrangement and method for construction is generated；S2 the physical location of dewatering well) is determined according to dewatering well arrangement and method for construction surveying and locating；S3) in the physical location of every mouthful of dewatering well to be onstructed, wellbore construction is carried out using drilling machine and forms dewatering well；S4 draining pump) is installed in precipitation bottom, injected clear water and is drawn water using draining pump into dewatering well and carries out well-flushing operation, until water sand removal is net, complete the construction of dewatering well；S5) in underground, water burst enters in dewatering well and after reaching predetermined altitude, completes precipitation using the underground water burst in draining pump extraction dewatering well and operates.Deep foundation pit precipitation construction method provided by the invention, construction volume is small, enhances the safety of construction, improves construction efficiency.
Description
Technical field
The present invention relates to City Subway Station foundation pit technical fields, and in particular to a kind of deep foundation pit precipitation construction method.
Background technique
The general buried depth in subway station in alluvial plain of Huanghe city is shallow, span is big, and geological condition is complicated, gravel soil and silt
Mud layer thickness is big, and widely distributed, while underground water, often through sandy gravel stratum and Yellow River System connection, sealing difficulty pole drops in foundation pit
It is also easy to produce piping and latent erosion risk.The conventional method of City Subway Station deep basal pit drop sealing at present are as follows: foundation pit takes inner support
And go along with sb. to guard him campshed supporting, and combine campshed between water-seal pile measures of preventing water, the prior art method there are the problem of: first is that engineering
Measure larger, higher cost, second is that sealing and foundation pit supporting construction construction after the completion of just can be carried out pit earthwork excavation, the duration compared with
Long, third is that sealing and the construction of foundation pit supporting construction and foundation pit structure have interference, supporting construction still needs to remove after construction, therefore,
In order to ensure the progress of engineering, quality, cost and safety, need using more economical reasonable drop water-stopping method.
Summary of the invention
The present invention provides a kind of deep foundation pit precipitation construction method, and construction volume is small, and can be with deep base during construction
The construction of hole structure carries out simultaneously, enhances the safety of construction, improves construction efficiency.
Deep foundation pit precipitation construction method provided by the invention, comprising the following steps: S1) deep basal pit determined according to construction requirement
Structure, design well depth and the design position of interior every mouthful of dewatering well, calculate the quantity of required dewatering well in deep basal pit, generate deep basal pit
Dewatering well arrangement and method for construction；S2 the physical location of the dewatering well) is determined according to dewatering well arrangement and method for construction surveying and locating；S3) every
The physical location of mouth dewatering well to be onstructed carries out wellbore construction using drilling machine and forms the dewatering well；S4) at the dewatering well bottom
Draining pump is installed in portion, injected clear water and is drawn water using the draining pump and is carried out well-flushing operation in Xiang Suoshu dewatering well, until water is clear
Sand is net, completes the construction of the dewatering well；S5) enter in the dewatering well and after reaching predetermined altitude in underground water burst, use
The draining pump extracts the underground water burst in the dewatering well out and completes precipitation operation.
Preferably, the step S1) in, the structure of every mouthful of dewatering well includes: precipitation wellhole, well casing and filler,
The well casing is placed in the precipitation wellhole, and the filler is filled between the well casing and the precipitation wellhole.
Preferably, the step S1) in, it is calculated using the following equation the quantity of required dewatering well in deep basal pit:
N=A/a, wherein
The quantity (mouth) of required dewatering well in n-deep basal pit；
A-deep basal pit area (m2)；
Effective precipitation area (the m of single dewatering well in a-deep basal pit2)。
Preferably, the step S3) using drilling machine carry out wellbore construction form the dewatering well, comprising: at every mouthful wait apply
Mouth guard tube is buried at the physical location of work dewatering well；The center that drilling machine is directed at the casing carries out wellbore construction, forms drop
Well hole；Wait be drilled with to design well depth position, operation is punched out to the precipitation wellhole using clear water and removes precipitation wellhole
Interior sundries, until without containing clod in the mud returned out in precipitation wellhole；It will be put under well casing in the precipitation wellhole, in institute
It states and fills the filler between well casing and the precipitation wellhole and ensure that the well casing is vertical, form the dewatering well.
Preferably, it in embedded mouth guard tube, is sealed on the outside of the mouth guard tube using cohesive soil.
Preferably, during wellbore construction, mud density is controlled within a predetermined range, described in the precipitation wellhole
Precipitation wellhole internal pressure expires mud, to prevent the hole wall collapse of the precipitation wellhole.
Preferably, it will be put under well casing before the precipitation wellhole, measure the precipitation well depth, determine the dewatering well
Depth reaches design well depth.
Preferably, it fills at the filler to the well head preset distance position apart from the dewatering well.
Preferably, packing is carried out using clay between the well head of the filler to the dewatering well.
Preferably, the brick wall for preventing surface waste water from flowing into outside well is built around the well head of the dewatering well.
Deep foundation pit precipitation construction method provided by the invention, by practice of construction situation and construction requirement, in deep basal pit
Structure, position and the quantity of dewatering well make rational planning for, the dewatering well can accommodate underground water burst, so that in deep basal pit
Drying is kept, deep basal pit structure construction can be gone on smoothly；Tune is made to the physical location of the dewatering well according to the actual situation
It is whole, guarantee the safety of construction；The construction volume of wellbore construction is small, and during construction, can apply with deep basal pit structure
Work carries out simultaneously, does not generate mutual interference, improves the efficiency of construction；It is extracted out in the dewatering well using the draining pump
Underground water burst completes precipitation operation, and effect easy to operate is good, and does not influence deep basal pit structure construction, enhances the safety of construction
Property, improve construction efficiency.
The other feature and advantage of the embodiment of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is to further understand for providing to the embodiment of the present invention, and constitute part of specification, under
The specific embodiment in face is used to explain the present invention embodiment together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure:
Fig. 1 is the step flow chart of the deep foundation pit precipitation construction method of embodiment according to the present invention；
Fig. 2 is the longitudinal section of dewatering well in the deep foundation pit precipitation construction method of embodiment according to the present invention.
Description of symbols
1 precipitation wellhole, 2 well casing
3 fillers
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the embodiment of the present invention.It should be understood that this
Locate described specific embodiment and be merely to illustrate and explain the present invention embodiment, is not intended to restrict the invention embodiment.
With reference to the accompanying drawing, technical solution in the embodiment of the present invention is described in detail.
As shown in Figs. 1-2, the present invention provides a kind of deep foundation pit precipitation construction method, comprising the following steps: S1) according to construction
It is required that determining the structure of every mouthful of dewatering well in deep basal pit, design well depth and design position, required dewatering well in deep basal pit is calculated
Quantity generates deep foundation pit precipitation well arrangement and method for construction；S2) according to dewatering well arrangement and method for construction surveying and locating determine every mouthful it is to be onstructed described
The physical location of dewatering well；S3 it) in the physical location of every mouthful of dewatering well to be onstructed, is formed using drilling machine progress wellbore construction described
Dewatering well；S4 draining pump) is installed in the precipitation bottom, injected clear water and the use draining pumping in Xiang Suoshu dewatering well
Water carries out well-flushing operation, until water sand removal is net, completes the construction of the dewatering well；S5) enter the dewatering well in underground water burst
It is interior and after reaching predetermined altitude, the underground water burst in the dewatering well is extracted out using the draining pump to complete precipitation operate.
During deep foundation pit construction, since the bottom surface of deep basal pit is lower than level of ground water, or due to underground bearing water
Pressure effect so that underground water pours in deep basal pit, influence the construction of deep basal pit, according to the technique and scheme of the present invention, this hair
The deep foundation pit precipitation construction method of bright offer, comprising steps of S1) knot of every mouthful of dewatering well in deep basal pit is determined according to construction requirement
Structure, design well depth and design position, calculate the quantity of required dewatering well in deep basal pit, generate deep foundation pit precipitation well arrangement and method for construction.
By practice of construction situation and construction requirement, make rational planning for the structure of the dewatering well in deep basal pit, position and quantity, institute
Underground water burst can be accommodated by stating dewatering well, so that keeping drying in deep basal pit, can go on smoothly deep basal pit structure construction.
A kind of embodiment according to the present invention, as shown in Fig. 2, the step S1) in, the structure of every mouthful of dewatering well
It include: precipitation wellhole 1, well casing 2 and filler 3, the well casing 2 is placed in the precipitation wellhole 1, and the filler 3 is filled in institute
It states between well casing 2 and the precipitation wellhole 1.The structure of the dewatering well is simple, while accommodating underground water burst, additionally it is possible to right
Underground water burst, which is filtered, prevents underground water burst carrying silt particle from entering deep basal pit, influences the construction of deep basal pit.
The material of a kind of embodiment according to the present invention, the well casing 2 is no sand filtration pipe or cement chimney filter etc., in institute
The outer wall for stating well casing 2 is coated with filter screen, and the length of the filter screen is usually the 20%~50% of width, in filtering underground
It while water burst, avoids forming larger resistance to underground water burst, influences underground water burst and enter in 2 inner cavity of well casing.
Preferably, the step S1) in, it is calculated using the following equation the quantity of required dewatering well in deep basal pit:
N=A/a, wherein
The quantity (mouth) of required dewatering well in n-deep basal pit；
A-deep basal pit area (m2)；
Effective precipitation area (the m of single dewatering well in a-deep basal pit2)。
Water burst is full of under extreme case in the deep basal pit, is equal to deep basal pit area to precipitation area and therefore uses deep basal pit
Area is divided by the effective precipitation area of single dewatering well to get to the quantity of dewatering well required under extreme case；In not up to pole
When holding situation, the dewatering well, which has, accommodates surplus, can guarantee going on smoothly for construction.
According to the technique and scheme of the present invention, step S2) dewatering well determined according to dewatering well arrangement and method for construction surveying and locating
Physical location.The physical location of the usual dewatering well and the deviation of the design position are less than or equal to 50mm, such as encounter spy
It when different situation (such as underground obstacle, ground or aerial barrage etc.) need to adjust well location, should be adjusted at the scene in time, to guarantee
The safety of construction.
According to the technique and scheme of the present invention, step S3) in the physical location of every mouthful of dewatering well to be onstructed, it is carried out using drilling machine
Wellbore construction forms the dewatering well.The construction volume of wellbore construction is small, and during construction, can be with deep basal pit structure
It constructs while carrying out, do not generate mutual interference, improve the efficiency of construction.
A kind of embodiment according to the present invention, the step S3) in the physical location of every mouthful of dewatering well to be onstructed, it utilizes
Drilling machine carries out wellbore construction and forms the dewatering well, comprising: mouth guard tube is buried at the physical location of every mouthful of dewatering well to be onstructed,
To prevent from returning to starch from the dewatering well in construction entering in the dewatering well of construction.
The center that drilling machine is directed at the casing carries out wellbore construction, forms precipitation wellhole 1；Wait be drilled with to design well depth
Behind position, the sundries in operation removing precipitation wellhole 1 is punched out to the precipitation wellhole 1 using clear water, until precipitation wellhole 1
Without containing clod in the mud inside returned out.Preferably, the drilling rod of drilling machine is promoted to the height apart from 1 bottom 0.5m of precipitation wellhole
Degree is gradually promoted and is punched out operation so that the mud density in hole is gradually adjusted to 1.1, bottom hole silting less than 30 centimetres,
Basis is provided for subsequent going on smoothly for well casing 2 of decentralization.
It will be put under well casing 2 in the precipitation wellhole 1, filled out described in filling between the well casing 2 and the precipitation wellhole 1
Material 3 ensures that the well casing 2 is vertical, forms the dewatering well.
A kind of embodiment according to the present invention, it is preferable that in embedded mouth guard tube, using viscous on the outside of the mouth guard tube
Property soil sealing, further prevent construction when from the dewatering well return slurry enter construction the dewatering well in.
A kind of embodiment according to the present invention, it is preferable that during wellbore construction, mud in the precipitation wellhole 1
Density domination expires mud within a predetermined range, in 1 internal pressure of precipitation wellhole, to prevent the hole wall collapse of the precipitation wellhole 1.
The mud density control is in the range of 1.1-1.15, to form slurry coat method during drilling well.
A kind of embodiment according to the present invention measures the precipitation for before being put into the precipitation wellhole 1 under well casing 2
Well depth determines that the precipitation well depth reaches design well depth, so that underground water burst will not be diffused out from the dewatering well, influences
The construction of deep basal pit.
A kind of embodiment according to the present invention fills the filler 3 to the well head preset distance apart from the dewatering well
At position.Preferably, the preset distance is 2 meters.It is carried out between the well head of the filler 3 to the dewatering well using clay
Packing prevents underground water burst from entering in deep basal pit by the filler 3, influences the structure construction of deep basal pit.
Mechanical filler is used filler uneven or generate to impact to the borehole wall to damage in order to prevent, it is usually used
Spade inserts the filler 3.
A kind of embodiment according to the present invention, it is preferable that building around the well head of the dewatering well prevents earth's surface dirty
The brick wall that water flows into outside well guarantees the cleannes of the precipitation well water, meets the condition drawn water.
According to the technique and scheme of the present invention, step S4) in precipitation bottom installation draining pump, Xiang Suoshu dewatering well
Injected clear water is simultaneously drawn water using the draining pump and carries out well-flushing operation, until water sand removal is net, completes the construction of the dewatering well.
A kind of embodiment according to the present invention assembles on road surface for guaranteeing water circulation in drilling process and saving brill
The mud pit that well is slagged tap, it is preferable that the volume of the mud pit is 1.5 times of single port dewatering well volume.The mud pit can be with
The underground water burst extracted out from the dewatering well is accommodated, upper layer clear water can be re-injected to the dewatering well by sludge settling
Middle progress well-flushing operation, has saved with water and has simplified process flow.
According to the technique and scheme of the present invention, step S5) enter in the dewatering well in underground water burst and reaches predetermined altitude
Afterwards, the underground water burst in the dewatering well being extracted out using the draining pump and completing precipitation operation, effect easy to operate is good, and not shadow
Deep basal pit structure construction is rung, the safety of construction is enhanced, improves construction efficiency.
A kind of embodiment according to the present invention establishes underground water burst dynamic monitoring network while carrying out dewatering construction,
The laying of monitoring point should meet: the radial laying monitoring point within radius affected by pumping water；Water is set in front of direction excavating
Position monitoring point；Different water cut layer position cloth hierarchical monitor point.
Before starting precipitation operation, each precipitation well head of Accurate Determining and ground elevation measure underground water burst static level,
It arranges pumping equipment, cable and drainage pipeline properly and makees trial operation, to guarantee that pumping system is intact.
Start after carrying out precipitation operation, monitor the dynamic change of underground water burst water level at any time, and detects foundation pit surrounding soil
Sedimentation and the influence to underground utilities etc..
During deep foundation pit construction, static level networking situation is observed dewatering well daily；7 days early periods of precipitation, every to water level 3
Observation in a hour is primary；Precipitation mid-term (to foundation construction) observation 2 times daily；The precipitation later period (construction to main structure top plate) is every
Week, observation one was to secondary；Underground water burst silt content observes one to secondary daily.
A kind of embodiment according to the present invention, after excavation of foundation pit to designed elevation, in underground, water yield is less than peak value
In the case where, water burst actual conditions a part of dewatering well can be sealed under base area；Remaining dewatering well need to meet anti-in main body body structure
It floats and shunts in a well again according to the actual situation when requiring.
Steps are as follows for specific shut-in well:
(1) depth under base plate of foundation pit is located at according to dewatering well, gets out cement, every packet cement can fill the well of about 0.8m
Pipe (if well depth is deeper, can first fill 2~3m under melon seeds piece, handstone to bottom plate, with Grouting Pipe good at present).
(2) grouting equipment, cable and Grouting Pipe and trial operation are installed, to guarantee that grouting system is intact.
(3) first pre- to stir 2~3m3Cement slurry, the ratio of mud 0.8~1.0, tripping in Grouting Pipe in dewatering well, slip casting nozzle
Away from precipitation bottom about 1.5m or so.
(4) start slip casting, marginal not slurry side slowly above propose Grouting Pipe, and guarantee slip casting nozzle be located at cement slurry liquid level 2m it
Under.It requires cement slurry to enter around dewatering well by chimney filter when slip casting, chimney filter gap is blocked, 0.1~0.4MPa of grouting pressure,
It can be according to practical adjustment.
(5) slip casting can be stopped after cement slurry is higher by bottom plate.
(6) after cement slurry reaches the presetting period, extraction well casing in remain water, and in time observe well casing in water level depth or
Absolute altitude situation of change.After general observation 2~4 hours, the water level in well casing is increased without apparent, illustrates that slip casting effect is preferable.
(7) after slip casting effect reaches requirement, cement slurry final set, the above downcast well pipe of base plate of foundation pit can be cut off.
(8) extra cement in well is cut, its top surface is made to be slightly below 8~10cm of base plate of foundation pit, and welds one piece of thickness 4 in well
The steel plate of~6mm.
(9) after well casing sealing, (can also apply when doing pave-load layer) is smoothed out with cement mortar filling hole, shut-in well work is complete
Finish.
Clay or fine sand can directly be backfilled by cheating outer well and shunting in a well, then when close to 1~2m of earth's surface grout injection to ground
?.
The object of the present invention is to provide a kind of deep foundation pit precipitation construction method, by practice of construction situation and construction requirement,
It makes rational planning for the structure of the dewatering well in deep basal pit, position and quantity, the dewatering well can accommodate underground water burst, make
It obtains and keeps drying in deep basal pit, deep basal pit structure construction can be gone on smoothly；According to the actual situation to the reality of the dewatering well
Position adjusts, and guarantees the safety of construction；The construction volume of wellbore construction is small, and during construction, can be with deep base
The construction of hole structure carries out simultaneously, does not generate mutual interference, improves the efficiency of construction；Using described in draining pump extraction
Underground water burst in dewatering well completes precipitation operation, and effect easy to operate is good, and does not influence deep basal pit structure construction, enhances and applies
The safety of work, improves construction efficiency.
The optional embodiment of the embodiment of the present invention is described in detail in conjunction with attached drawing above, still, the embodiment of the present invention is simultaneously
The detail being not limited in above embodiment can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical solution for applying example carries out a variety of simple variants, these simple variants belong to the protection scope of the embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the embodiment of the present invention pair
No further explanation will be given for various combinations of possible ways.
In addition, any combination can also be carried out between a variety of different embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is violated, equally should be considered as disclosure of that of the embodiment of the present invention.
Claims (10)
1. a kind of deep foundation pit precipitation construction method, which is characterized in that the construction method the following steps are included:
S1 the structure of every mouthful of dewatering well in deep basal pit, design well depth and design position) are determined according to construction requirement, calculate deep basal pit
The quantity of dewatering well needed for interior generates deep foundation pit precipitation well arrangement and method for construction；
S2 the physical location of the dewatering well) is determined according to dewatering well arrangement and method for construction surveying and locating；
S3) in the physical location of every mouthful of dewatering well to be onstructed, wellbore construction is carried out using drilling machine and forms the dewatering well；
S4 draining pump) is installed in the precipitation bottom, injected clear water and is drawn water using the draining pump in Xiang Suoshu dewatering well
Well-flushing operation is carried out, until water sand removal is net, completes the construction of the dewatering well；
S5) enter in the dewatering well and after reaching predetermined altitude in underground water burst, extract the precipitation out using the draining pump
Underground water burst in well completes precipitation operation.
2. construction method according to claim 1, which is characterized in that the step S1) in, the knot of every mouthful of dewatering well
Structure includes: precipitation wellhole (1), well casing (2) and filler (3), and the well casing (2) is placed in the precipitation wellhole (1), described to fill out
Material (3) is filled between the well casing (2) and the precipitation wellhole (1).
3. construction method according to claim 1, which is characterized in that the step S1) in, it is calculated using the following equation depth
The quantity of required dewatering well in foundation pit:
N=A/a, wherein
The quantity (mouth) of required dewatering well in n-deep basal pit；
A-deep basal pit area (m2)；
Effective precipitation area (the m of single dewatering well in a-deep basal pit2)。
4. construction method according to claim 2, which is characterized in that the step S3) utilize drilling machine progress wellbore construction
Form the dewatering well, comprising:
Mouth guard tube is buried at the physical location of every mouthful of dewatering well to be onstructed；
The center that drilling machine is directed at the casing carries out wellbore construction, is formed precipitation wellhole (1)；
Wait be drilled with to design well depth position, operation is punched out to the precipitation wellhole (1) using clear water and removes precipitation wellhole
(1) sundries in, until without containing clod in the mud returned out in precipitation wellhole (1)；
It will be put under well casing (2) in the precipitation wellhole (1), fill institute between the well casing (2) and the precipitation wellhole (1)
Stating filler (3) ensures the well casing (2) vertically, forms the dewatering well.
5. construction method according to claim 4, which is characterized in that in embedded mouth guard tube, on the outside of the mouth guard tube
It is sealed using cohesive soil.
6. construction method according to claim 4, which is characterized in that during wellbore construction, the precipitation wellhole (1)
Interior mud density control within a predetermined range, expires mud in precipitation wellhole (1) internal pressure to prevent the precipitation wellhole (1)
Hole wall collapse.
7. construction method according to claim 4, which is characterized in that will be put under well casing (2) the precipitation wellhole (1) it
Before, the precipitation well depth is measured, determines that the precipitation well depth reaches design well depth.
8. construction method according to claim 4, which is characterized in that fill the filler (3) to apart from the dewatering well
Well head preset distance position at.
9. construction method according to claim 8, which is characterized in that the well head in the filler (3) to the dewatering well
Between using clay carry out packing.
10. construction method according to claim 1, which is characterized in that building around the well head of the dewatering well prevents
The brick wall that surface waste water flows into outside well.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110820778A (en) * | 2019-10-25 | 2020-02-21 | 陕西神州实业有限公司 | Local precipitation construction method for foundation pit |
| CN111335344A (en) * | 2020-03-19 | 2020-06-26 | 中铁六局集团有限公司 | Super pressure suction combined well point dewatering construction method for subway deep foundation pit |
| 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 |
| CN113250220A (en) * | 2021-05-13 | 2021-08-13 | 中铁五局集团成都工程有限责任公司 | Novel dewatering method for deep foundation pit close to existing building |
| CN114525799A (en) * | 2021-12-28 | 2022-05-24 | 南通大学 | Construction method of downcast pipe well |
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| CN110820778A (en) * | 2019-10-25 | 2020-02-21 | 陕西神州实业有限公司 | Local precipitation construction method for foundation pit |
| CN111335344A (en) * | 2020-03-19 | 2020-06-26 | 中铁六局集团有限公司 | Super pressure suction combined well point dewatering construction method for subway deep foundation pit |
| 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 |
| CN113250220A (en) * | 2021-05-13 | 2021-08-13 | 中铁五局集团成都工程有限责任公司 | Novel dewatering method for deep foundation pit close to existing building |
| CN114525799A (en) * | 2021-12-28 | 2022-05-24 | 南通大学 | Construction method of downcast pipe well |
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