CN111456055A - Foundation pit dewatering construction method - Google Patents
Foundation pit dewatering construction method Download PDFInfo
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- CN111456055A CN111456055A CN202010320671.1A CN202010320671A CN111456055A CN 111456055 A CN111456055 A CN 111456055A CN 202010320671 A CN202010320671 A CN 202010320671A CN 111456055 A CN111456055 A CN 111456055A
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- well
- dewatering
- foundation pit
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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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- Hydrology & Water Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a foundation pit dewatering construction method, which relates to the technical field of foundation pit drainage and has the technical problems that an underground water level is easy to permeate into a foundation pit and has serious influence on the stability of the foundation pit in the construction process; the technical scheme comprises the following steps: s1, laying well positions as required, and measuring the ground elevation; s2, digging a mud pit at the side of the well position, and manually digging a backflow water ditch between the well head and the mud pit; s3, positioning a drilling machine to a well point position to form a well hole, and placing a well pipe in the well hole; s4, immediately filling a filter material after the well pipe is put into the well pipe; s5, after filling the filter material into the well point, sealing and compacting below the well mouth; s6, after the well is formed, a water pump is put into the well to wash the well; s7, laying a drain pipe along the outer side of the foundation pit, and connecting the drain pipe to a municipal specified drainage position; s8, hanging a water pump into the well by adopting a rope; and S9, starting a power supply of the water pump to pump water in the well. The invention can reduce the infiltration of ground water in the foundation pit and improve the precipitation effect of the foundation pit.
Description
Technical Field
The invention relates to the technical field of foundation pit drainage, in particular to a foundation pit dewatering construction method.
Background
The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation.
The existing foundation pit, referring to fig. 1, includes a pit body 1 dug manually, and the pit body 1 is generally lower than the ground surface to improve the firmness of the superstructure of the foundation.
The above prior art solutions have the following drawbacks: the foundation pit is formed by excavating on the foundation ground in the building construction process, and the underground water level easily permeates into the foundation pit, so that the stability of the foundation pit in the construction process is seriously influenced, and the improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a foundation pit dewatering construction method, which can reduce the infiltration situation of ground water in a foundation pit and improve the dewatering effect of the foundation pit.
The above object of the present invention is achieved by the following technical solutions:
a foundation pit dewatering construction method comprises the following steps:
s1, setting line and positioning well: laying well positions as required, measuring the ground elevation, and marking the well positions by using obvious marks;
s2, dredging a mud ditch: digging a mud pit at the side of the well position, and manually digging a backflow water ditch between the well head and the mud pit;
s3, positioning the well machine: the drilling machine is positioned to a well point, firstly, trial drilling is carried out, drilling is carried out according to the design to a specified depth, a well hole is formed, and a well pipe is placed in a drilling hole;
s4, filling a filter material: filling a filter material immediately after the well pipe is put into the well pipe;
s5, sealing the well: after the well point is filled with the filter material, sealing and compacting below the well mouth;
s6, well washing: after the well is formed, a water pump is put into the well to wash the well until clear water is pumped out;
s7, mounting a drain pipe: laying a drain pipe along the outer side of the foundation pit, wherein the drain pipe is connected to a municipal specified drainage position;
s8, water pump installation: the water pump is hung in the well by adopting a rope, and after the water pump is placed to a specified position, a cable and an electric brake box are laid, and a power supply is switched on;
s9, pumping water: and starting a power supply of the water pump to pump water in the well.
By adopting the technical scheme, firstly, a well is opened at the bottom of the foundation pit, a mud pool is dug to circularly precipitate mud in the drilling process, and the mud in the mud pool is cleaned and extracted in time every day; the well casing is placed in the well hole and is filled with the filter material, then is sealed tightly, washs new well for its sand content reaches specified standard, can install drain pipe and water pump, continuously draws water to the precipitation well through the water pump, and discharges to appointed unit, thereby realizes the precipitation to the foundation ditch, alleviates the condition of ground water infiltration in the foundation ditch, reduces the cave in that collapses of foundation ditch.
The present invention in a preferred example may be further configured to: in the step S1, the steel chisel is driven into the ground for 300-.
Through adopting above-mentioned technical scheme, squeeze into ground through the drill rod to detect soil quality, can consolidate showing the sign simultaneously, reduce to show that the sign takes place to empty, lead to the operation workman to be difficult to observe the specific position of the well position of design fast.
The present invention in a preferred example may be further configured to: in step S2, the mud pit is located between multiple wells when the position is selected.
By adopting the technical scheme, the mud pit is positioned among the multiple wells, so that one mud pit can be used by a plurality of dewatering wells, the pollution to the site is reduced, the energy and manpower consumption in digging a plurality of mud pits is reduced, and the contribution is made to the environmental engineering of the city.
The present invention in a preferred example may be further configured to: in step S3, the deviation of the verticality of the well is less than 1%.
The deviation of the well hole is too serious, the soil on the inner side wall of the well hole is easy to collapse under the action of gravity under the condition of inclination, and meanwhile, the pressure on the outer side wall of the well pipe is higher; by adopting the technical scheme, the vertical deviation degree of the well hole during drilling is controlled, the well hole needs to tend to be vertical, the pressure of soil on the inner side wall of the well hole on the well pipe is reduced, the stability of the well pipe during setting is improved, and the stability of a later foundation pit during precipitation is improved.
The present invention in a preferred example may be further configured to: in the step S4, the filter material adopts gravel with the specification of 6-12 mm.
By adopting the technical scheme, the gravels with smaller diameters are selected, so that the gap between every two gravels is smaller, the sliding probability among the gravels is smaller, and the stability of the gravels serving as filter materials is improved; meanwhile, the gravel serving as the filter material has a strong filtering effect due to the small diameter of the gravel.
The present invention in a preferred example may be further configured to: in the step S5, sealing and compacting 1-1.5m below the wellhead.
By adopting the technical scheme, the compaction is sealed at the position 1-1.5m away from the wellhead, so that the using amount of the filter material is reduced under the condition that the compaction is sealed at the wellhead, the filter material still can play a role in filtering, and the air leakage is prevented to reduce the precipitation effect.
The present invention in a preferred example may be further configured to: in the step S6, after the well is washed, the volume ratio of the sand content of the dewatering well should be less than 0.002%.
Through adopting above-mentioned technical scheme, the well washing is discharged the grit in the new precipitation well, through control sand content rate to drawing water in the precipitation well to the later stage lasts provides the guarantee, reduces the grit and discharges into municipal specified drainage point, reduces environmental pollution, makes the contribution for the environmental engineering in city.
The present invention in a preferred example may be further configured to: in the step S7, before the drainage pipe is discharged into the municipal administration designated drainage position through the dewatering well, the drainage pipe is firstly discharged into the slurry pond for sedimentation.
By adopting the technical scheme, the water pumped from the precipitation well is firstly deposited, the water flow and the sand and the stone are separated at the position, the sand and the stone are deposited at the bottom of the mud pit, and the running water is discharged into a municipal specified drainage position; further reduce the grit and discharge into municipal administration appointed drainage position, reduce environmental pollution, make a contribution for the environmental engineering in city.
The present invention in a preferred example may be further configured to: in the step S8, the water pump is hung and placed in the well by a rope, and the distance between the water pump and the bottom of the well is 1-1.5 m.
By adopting the technical scheme, the placing position of the water pump is 1-1.5m away from the bottom of the well, so that the suction force of the water pump to the bottom of the well in the water pumping process can be reduced, the disturbance of the suction force of the water pump to the soil at the bottom of the well is reduced, and the stability of the soil at the bottom of the well is improved; the impurity proportion of the pumped water flow is reduced.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the dewatering well is continuously pumped by the water pump and discharged to a specified unit, so that the dewatering of the foundation pit is realized, the condition of ground water permeation in the foundation pit is reduced, and the collapse and depression of the foundation pit are reduced;
2. the gravels with smaller diameters are selected, so that the gaps among the gravels are smaller, the sliding probability among the gravels is smaller, and the stability of the gravels as filter materials is improved; meanwhile, the gravel serving as the filter material has a strong filtering effect due to the small diameter of the gravel.
Drawings
FIG. 1 is a schematic diagram of a background art configuration;
fig. 2 is a flowchart of the present embodiment.
In the figure, 1, a pit body.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 2, the method for foundation pit dewatering construction disclosed by the invention comprises the following steps:
s1, setting line and positioning well: well positions are arranged according to requirements, the well spacing is 15m, the ground elevation is measured, and the upper opening line of a dewatering well tool groove is arranged by 1.5 m; well positions are marked by marked marks, and are driven into the ground by steel drill rods for 320m, and lime powder is poured into the well positions.
S2, dredging a mud ditch: a mud pit is dug beside the well position, the size of the mud pit is 6 x 0.5m, and when the mud pit is selected, the mud pit is positioned among multiple wells, one pool is arranged among the multiple wells, so that the pollution to the site is reduced, and the mud pit can be built by bricks; a backflow water ditch is manually dug between the wellhead and the mud pit.
S3, positioning the well machine: the drilling machine is positioned to a well point, preferably a pumping reverse circulation drilling machine, firstly, pilot drilling is carried out, the drilling speed is changed according to the field situation, and the specific gravity of the slurry is controlled; drilling at a specified depth according to the design to form a well hole with the diameter of 560mm, wherein the verticality deviation of the well hole is less than 1%;
and the well pipes are placed in the inlet holes, the well pipes are reinforced concrete well pipes with the inner diameter of 300mm, the length of each well pipe is 2.5m, the well pipes are welded firmly and are vertically installed, and gaps between the well pipes and the inner side walls of the well holes are uniform.
S4, filling a filter material: immediately filling a filter material after the well pipe is put in, wherein the filter material adopts 8 mm-sized gravels, the thickness of the gravel is 80mm, and the sand filling thickness is uniform and continuous; the height of the filter material is higher than the underground water line.
S5, sealing the well: after the well point is filled with filter material, the well head is sealed and compacted with clay 1.2m below the well head.
S6, well washing: after the well is formed, a water pump is put into the well to wash the well, the water pump adopts a submersible pump to wash the well one by one until clear water is pumped out; after the well is washed, the volume ratio of the sand content of the dewatering well is less than 0.002%.
S7, mounting a drain pipe: and (3) laying a drain pipe along the outer side of the foundation pit, wherein the diameter of the drain pipe is 200mmPVC pipe, water is firstly discharged into the slurry pond through the drain pipe for deposition, and then is discharged into a municipal specified drainage position.
S8, water pump installation: the water pump is hung in the well by adopting a rope, the rope is a steel wire rope, and the distance between the water pump and the bottom of the well is 1 m; after the device is placed to a designated position, a cable and an electric brake box are laid, single-well single control is realized, and a power supply is switched on.
S9, pumping water: starting a power supply of a water pump to pump water in the well; and observing the sand amount, and flushing the well again once the sand amount is too large.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A foundation pit dewatering construction method is characterized by comprising the following steps: the method comprises the following steps:
s1, setting line and positioning well: laying well positions as required, measuring the ground elevation, and marking the well positions by using obvious marks;
s2, dredging a mud ditch: digging a mud pit at the side of the well position, and manually digging a backflow water ditch between the well head and the mud pit;
s3, positioning the well machine: the drilling machine is positioned to a well point, firstly, trial drilling is carried out, drilling is carried out according to the design to a specified depth, a well hole is formed, and a well pipe is placed in a drilling hole;
s4, filling a filter material: filling a filter material immediately after the well pipe is put into the well pipe;
s5, sealing the well: after the well point is filled with the filter material, sealing and compacting below the well mouth;
s6, well washing: after the well is formed, a water pump is put into the well to wash the well until clear water is pumped out;
s7, mounting a drain pipe: laying a drain pipe along the outer side of the foundation pit, wherein the drain pipe is connected to a municipal specified drainage position;
s8, water pump installation: the water pump is hung in the well by adopting a rope, and after the water pump is placed to a specified position, a cable and an electric brake box are laid, and a power supply is switched on;
s9, pumping water: and starting a power supply of the water pump to pump water in the well.
2. A method of dewatering foundation pits according to claim 1 and characterised by: in the step S1, the steel chisel is driven into the ground for 300-.
3. A method of dewatering foundation pits according to claim 1 and characterised by: in step S2, the mud pit is located between multiple wells when the position is selected.
4. A method of dewatering foundation pits according to claim 1 and characterised by: in step S3, the deviation of the verticality of the well is less than 1%.
5. A method of dewatering foundation pits according to claim 1 and characterised by: in the step S4, the filter material adopts gravel with the specification of 6-12 mm.
6. A method of dewatering foundation pits according to claim 1 and characterised by: in the step S5, sealing and compacting 1-1.5m below the wellhead.
7. A method of dewatering foundation pits according to claim 1 and characterised by: in the step S6, after the well is washed, the volume ratio of the sand content of the dewatering well should be less than 0.002%.
8. A method of dewatering foundation pits according to claim 1 and characterised by: in the step S7, before the drainage pipe is discharged into the municipal administration designated drainage position through the dewatering well, the drainage pipe is firstly discharged into the slurry pond for sedimentation.
9. A method of dewatering foundation pits according to claim 1 and characterised by: in the step S8, the water pump is hung and placed in the well by a rope, and the distance between the water pump and the bottom of the well is 1-1.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010320671.1A CN111456055A (en) | 2020-04-22 | 2020-04-22 | Foundation pit dewatering construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010320671.1A CN111456055A (en) | 2020-04-22 | 2020-04-22 | Foundation pit dewatering construction method |
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| CN111456055A true CN111456055A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010320671.1A Pending CN111456055A (en) | 2020-04-22 | 2020-04-22 | Foundation pit dewatering construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252346A (en) * | 2020-09-11 | 2021-01-22 | 北京市市政二建设工程有限责任公司 | Construction method of dewatering well |
| CN112682044A (en) * | 2020-12-08 | 2021-04-20 | 上海市基础工程集团有限公司 | Construction method of small-caliber dewatering well between narrow cracks |
| CN114525799A (en) * | 2021-12-28 | 2022-05-24 | 南通大学 | Construction method of downcast pipe well |
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2020
- 2020-04-22 CN CN202010320671.1A patent/CN111456055A/en active Pending
Patent Citations (4)
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| JP2004068485A (en) * | 2002-08-08 | 2004-03-04 | Sakamoto Shokai:Kk | Method of forcedly removing surface water in deep well construction method |
| CN103031850A (en) * | 2013-01-08 | 2013-04-10 | 中铁上海工程局有限公司 | Low-permeability sludge claypan ultra-vacuum dual-pipe unwatering well and construction technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252346A (en) * | 2020-09-11 | 2021-01-22 | 北京市市政二建设工程有限责任公司 | Construction method of dewatering well |
| CN112682044A (en) * | 2020-12-08 | 2021-04-20 | 上海市基础工程集团有限公司 | Construction method of small-caliber dewatering well between narrow cracks |
| CN114525799A (en) * | 2021-12-28 | 2022-05-24 | 南通大学 | Construction method of downcast pipe well |
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Application publication date: 20200728 |