CN106930304A - Drift sand base pit dewatering construction method - Google Patents
Drift sand base pit dewatering construction method Download PDFInfo
- Publication number
- CN106930304A CN106930304A CN201710184018.5A CN201710184018A CN106930304A CN 106930304 A CN106930304 A CN 106930304A CN 201710184018 A CN201710184018 A CN 201710184018A CN 106930304 A CN106930304 A CN 106930304A
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- Prior art keywords
- drainage groove
- filter
- pipe
- filter pipe
- coarse sand
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Classifications
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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
-
- 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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
-
- 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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/20—Restraining of underground water by damming or interrupting the passage of underground water by displacing the water, e.g. by compressed air
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- 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 discloses a kind of drift sand base pit dewatering construction method, comprise the following steps：1）All around a drainage groove is excavated in foundation ditch around foundation ditch；2）The filter pipe that some closed at both ends are set is obtained, being covered with filter pipe there are some treatment holes, then in the metafiltration net of filter pipe outer cladding one；3）One layer of coarse sand is laid in drainage groove bottom land, then by step 2）In some filter pipes be laid on coarse sand along drainage trench length direction, then obtain some vavuum pumps and be placed in by drainage groove, every filter pipe is connected with the pumping end of corresponding vavuum pump by exhaust tube；4）To coarse sand is inserted in drainage groove, form coarse sand integument and filter pipe is wrapped in inside it, then be compacted up to drainage groove top and to clay to clay is inserted in drainage groove；5）Starting all of vavuum pump carries out precipitation., using the dewatering mode for actively drawing water, not only pump-out is big, while precipitation efficiency is high, shortens the construction period for the present invention.
Description
Technical field
The present invention relates to the realm of building construction, and in particular to a kind of drift sand base pit dewatering construction method.
Background technology
With the development of construction technology, architecture Foundation Pit Engineering constantly extends to underground, and building foundation pit precipitation is one larger
Problem, foundation ditch width and depth are larger in particularly present engineering, the big engineering of underground water content.Existing precipitation technology master
There are well-point dewatering method and tube well dewatering method, tube well dewatering method is that some pipe wells for working independently are arranged around foundation ditch, underground
Water is flowed under the influence of gravity into well, is taken away water with pumping equipment.And well-point dewatering method be one by well casing, water header,
The drainage system of the compositions such as common centrifugal water pump, vavuum pump and header tank.Underground water relies on true from the filter pipe of well casing lower end
The swabbing action of empty pump and water pump is flowed into pipe, imports water header, flows into header tank, is discharged by water pump.Tube well dewatering method one
As with respect to compare with underground water depth that is abundant and excavating it is deep when use, underground water flows under the influence of gravity into well
In, water is taken away with pumping equipment, precipitation is carried out by passive mode, not only precipitation efficiency is low, and the precipitation duration is also long in addition；
And underground water is flowed into pipe from the filter pipe of well casing lower end by the swabbing action of vavuum pump and water pump in well-point dewatering method, import
Water header, flows into header tank, is discharged by water pump, although carry out precipitation by the way of active, but usually cutting depth
Used in the case that shallower and water level is little, well casing diameter is generally smaller in well-point dewatering method in addition, water yield is also corresponding smaller,
Equally have impact on precipitation efficiency.
In the sand dirt band environment little for water penetration, particularly soil body osmotic coefficient it is moderate 50~100m/d it
Between, water content of soil is larger, using above two precipitation method, not only reduces precipitation efficiency, while also extending construction work
Phase.
The content of the invention
For above-mentioned the deficiencies in the prior art, the technical problems to be solved by the invention are：A kind of raising how is provided to drop
Water efficiency, shortens the drift sand base pit dewatering construction method of construction period.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
A kind of drift sand base pit dewatering construction method, comprises the following steps：
1）A drainage groove all around is excavated around foundation ditch in foundation ditch, the bottom land absolute altitude of drainage groove is marked less than the hole bottom of foundation ditch
It is high；
2）The filter pipe that some closed at both ends are set is obtained, being covered with filter pipe there are some treatment holes, then outside filter pipe
One layer of mesh number of cladding is 80~100 filter screen；
3）One layer of coarse sand is laid in drainage groove bottom land, then by step 2）In some filter pipes along drainage trench length direction spread
It is located on coarse sand, adjacent two filter pipes head and the tail are affixed, then obtains some vavuum pumps and be placed in by drainage groove, by pumping
Pipe makes every filter pipe be connected with the pumping end of corresponding vavuum pump；
4）To coarse sand is inserted in drainage groove, form coarse sand integument and filter pipe is wrapped in inside it, then in drainage groove
Clay is inserted until being compacted at the top of drainage groove and to clay；
5）Starting all of vavuum pump carries out precipitation.
In the present invention, the waterline in order to make underground water is under the elevation line at Foundation Pit bottom all the time, will be dug
The drainage groove bottom land absolute altitude of pick so when precipitation, can not only make to be located at water-filtering ditch less than the bottom land absolute altitude of foundation ditch
Waterline outside groove declines, it is to avoid underground water product in foundation ditch, while under the waterline in drainage groove in foundation ditch can also be made
Drop, makes Foundation Pit bottom keep dry state, it is to avoid ponding.Filter pipe is wrapped in inside it using coarse sand, coarse sand can be filtered
Other impermeability materials such as clay, ratchel for being mingled with water, and the filter screen of drainage tube outer surface cladding can enter to coarse sand
Row barrier, it is to avoid it is entered into filter pipe.Finally recycle clay that filter pipe and coarse sand are enclosed in drainage groove, energy
Enough during filter pipe draws water, it is to avoid pressure release situation occur, filter pipe pumpage is reduced, influence precipitation efficiency.This hair
It is bright to employ the method actively drawn water, drawn water using vavuum pump, filter pipe surrounding is formed a negative pressure space, it is actively right
The moisture on periphery is extracted, and by the filter pipe set around foundation ditch, declines the waterline of foundation ditch surrounding, around foundation ditch
Moisture is completely cut off, and allows foundation ditch to be in an environment for closing, improves the precipitation efficiency of foundation ditch.The pipe shaft of other filter pipe
On some treatment holes for being covered with while drawn water, improve pump-out, further increase precipitation efficiency, and then shorten and apply
Work works, and reduces construction cost.
Used as optimization, every two adjacent filter pipes, a vavuum pump and an exhaust tube are one group of drop
Water unit, wherein being provided with T-shaped three-limb tube, two drainages between two filter pipes in every group of precipitation unit
The relative one end of pipe connects with two athwartship legs of T-shaped three-limb tube respectively, and the vertical branch pipe of T-shaped three-limb tube is in perpendicular
Directly set up and connected with one end of the exhaust tube, the other end of the exhaust tube connects with the pumping end of the vavuum pump
It is logical.Two filter pipes are connected by T-shaped three-limb tube, is evacuated by an exhaust tube, reduce the number of exhaust tube
Amount, can make a vavuum pump while carrying out operation of drawing water to two filter pipes, cost be not only reduced, while it also avoid
Many exhaust tubes, because the reasons such as vibrations make to occur between clay pressure release caused by gap, influence precipitation efficiency.
Used as optimization, every drainage groove is excavated using order from top to bottom successively, every layer of excavation thickness
In 0.3~0.6m.The drainage groove of too early excavation can be avoided because caving in occurs in influence on groundwater, while also avoiding excavation too early
Drainage groove internal water accumulation, influence the later stage construction.
Used as optimization, the coarse sand wraps up minimum of the layer surface along the filter pipe radial direction to the drainage pipe surface
Distance is 50mm.Filter pipe periphery is set there are enough coarse sands to be filtered, it is to avoid impurity blocks treatment hole.
In sum, the beneficial effects of the present invention are：The present invention uses the dewatering mode for actively drawing water, not only pump-out
Greatly, while precipitation efficiency is high, the construction period is shortened.
Specific embodiment
The present invention is described in further detail below.
Drift sand base pit dewatering construction method in this specific embodiment, comprises the following steps：
1）A drainage groove all around is excavated around foundation ditch in foundation ditch, the bottom land absolute altitude of drainage groove is marked less than the hole bottom of foundation ditch
It is high；
2）The filter pipe that some closed at both ends are set is obtained, being covered with filter pipe there are some treatment holes, then outside filter pipe
One layer of mesh number of cladding is 80~100 filter screen；
3）One layer of coarse sand is laid in drainage groove bottom land, then by step 2）In some filter pipes along drainage trench length direction spread
It is located on coarse sand, adjacent two filter pipes head and the tail are affixed, then obtains some vavuum pumps and be placed in by drainage groove, by pumping
Pipe makes every filter pipe be connected with the pumping end of corresponding vavuum pump；
4）To coarse sand is inserted in drainage groove, form coarse sand integument and filter pipe is wrapped in inside it, then in drainage groove
Clay is inserted until being compacted at the top of drainage groove and to clay；
5）Starting all of vavuum pump carries out precipitation.
In this specific embodiment, every two adjacent filter pipes, a vavuum pump and an exhaust tube
It is one group of precipitation unit, wherein being provided with T-shaped three-limb tube, two between two filter pipes in every group of precipitation unit
The relative one end of the filter pipe connects with two athwartship legs of T-shaped three-limb tube respectively, T-shaped three-limb tube it is vertical
Branch pipe in setting straight up and being connected with one end of the exhaust tube, with the vavuum pump take out by the other end of the exhaust tube
Gas end connects.
In this specific embodiment, every drainage groove is excavated using order from top to bottom successively, every layer
Thickness is excavated in 0.3~0.6m.
In this specific embodiment, the coarse sand wraps up layer surface along the filter pipe radial direction to the filter pipe table
The minimum range in face is 50mm.
During specific implementation, a diameter of 40~60mm of the filter pipe, pipe thickness is not more than 2mm, some
The treatment hole is staggered along the filter pipe circumferential and axial, and the aperture of each treatment hole is 4~6mm, adjacent two
The pitch-row of the individual treatment hole is 20~30mm.Treatment hole is set to be distributed on filter pipe more uniform, can be uniformly to surrounding
Drawn water, improved precipitation efficiency.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although by ginseng
According to the preferred embodiments of the present invention, invention has been described, it should be appreciated by those of ordinary skill in the art that can
To make various changes to it in the form and details, without departing from the present invention that appended claims are limited
Spirit and scope.
Claims (4)
1. a kind of drift sand base pit dewatering construction method, it is characterised in that：Comprise the following steps：
1）A drainage groove all around is excavated around foundation ditch in foundation ditch, the bottom land absolute altitude of drainage groove is marked less than the hole bottom of foundation ditch
It is high；
2）The filter pipe that some closed at both ends are set is obtained, being covered with filter pipe there are some treatment holes, then outside filter pipe
One layer of mesh number of cladding is 80~100 filter screen；
3）One layer of coarse sand is laid in drainage groove bottom land, then by step 2）In some filter pipes along drainage trench length direction spread
It is located on coarse sand, adjacent two filter pipes head and the tail are affixed, then obtains some vavuum pumps and be placed in by drainage groove, by pumping
Pipe makes every filter pipe be connected with the pumping end of corresponding vavuum pump；
4）To coarse sand is inserted in drainage groove, form coarse sand integument and filter pipe is wrapped in inside it, then in drainage groove
Clay is inserted until being compacted at the top of drainage groove and to clay；
5）Starting all of vavuum pump carries out precipitation.
2. the drift sand base pit dewatering construction method according to claim, it is characterised in that：Every two adjacent filter pipes,
One vavuum pump and an exhaust tube are one group of precipitation unit, wherein two drainages in every group of precipitation unit
Be provided with T-shaped three-limb tube between pipe, the relative one end of two filter pipes respectively with two horizontal strokes of T-shaped three-limb tube
Connected to branch pipe, the vertical branch pipe of T-shaped three-limb tube is described in setting straight up and being connected with one end of the exhaust tube
The other end of exhaust tube is connected with the pumping end of the vavuum pump.
3. drift sand base pit dewatering construction method according to claim 1, it is characterised in that：Every the drainage groove is used
From top to bottom order successively is excavated, and every layer is excavated thickness in 0.3~0.6m.
4. drift sand base pit dewatering construction method according to claim 1, it is characterised in that：The coarse sand parcel layer surface edge
The filter pipe radial direction to the minimum range of the drainage pipe surface is 50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184018.5A CN106930304A (en) | 2017-03-24 | 2017-03-24 | Drift sand base pit dewatering construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184018.5A CN106930304A (en) | 2017-03-24 | 2017-03-24 | Drift sand base pit dewatering construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106930304A true CN106930304A (en) | 2017-07-07 |
Family
ID=59425140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710184018.5A Pending CN106930304A (en) | 2017-03-24 | 2017-03-24 | Drift sand base pit dewatering construction method |
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| CN (1) | CN106930304A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736337A (en) * | 2019-02-22 | 2019-05-10 | 宁蔚蔚 | A kind of substrate elevator catch pit drift sand processing guarantees the dewatering device and method of bed course integrality |
| CN110644498A (en) * | 2019-09-23 | 2020-01-03 | 李贺清 | Deep foundation pit slope quicksand handling method |
| CN111021385A (en) * | 2019-12-18 | 2020-04-17 | 宁蔚蔚 | Precipitation method for treating quicksand when manual hole digging pile hole digging meets quicksand layer |
| CN111305241A (en) * | 2019-12-18 | 2020-06-19 | 宁蔚蔚 | Method for treating quicksand in hole digging of manual hole digging pile through light well point dewatering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61117327A (en) * | 1984-11-14 | 1986-06-04 | Taiyo Gijutsu Kaihatsu Kk | Drain reinforcing earthwork method |
| CN205152968U (en) * | 2015-11-19 | 2016-04-13 | 中国建筑第七工程局有限公司 | Precipitation tubular well structure |
| CN205530381U (en) * | 2016-01-20 | 2016-08-31 | 中国建筑第二工程局有限公司 | Water filtering tank for directionally guiding underground water outside basement outer wall |
| CN106013045A (en) * | 2016-06-01 | 2016-10-12 | 上海建研地基基础工程有限公司 | Fast drainage method for shallow soil body |
-
2017
- 2017-03-24 CN CN201710184018.5A patent/CN106930304A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61117327A (en) * | 1984-11-14 | 1986-06-04 | Taiyo Gijutsu Kaihatsu Kk | Drain reinforcing earthwork method |
| CN205152968U (en) * | 2015-11-19 | 2016-04-13 | 中国建筑第七工程局有限公司 | Precipitation tubular well structure |
| CN205530381U (en) * | 2016-01-20 | 2016-08-31 | 中国建筑第二工程局有限公司 | Water filtering tank for directionally guiding underground water outside basement outer wall |
| CN106013045A (en) * | 2016-06-01 | 2016-10-12 | 上海建研地基基础工程有限公司 | Fast drainage method for shallow soil body |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736337A (en) * | 2019-02-22 | 2019-05-10 | 宁蔚蔚 | A kind of substrate elevator catch pit drift sand processing guarantees the dewatering device and method of bed course integrality |
| CN110644498A (en) * | 2019-09-23 | 2020-01-03 | 李贺清 | Deep foundation pit slope quicksand handling method |
| CN111021385A (en) * | 2019-12-18 | 2020-04-17 | 宁蔚蔚 | Precipitation method for treating quicksand when manual hole digging pile hole digging meets quicksand layer |
| CN111305241A (en) * | 2019-12-18 | 2020-06-19 | 宁蔚蔚 | Method for treating quicksand in hole digging of manual hole digging pile through light well point dewatering |
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Application publication date: 20170707 |