CN105625445B - A kind of Method on Dewatering of Foundation Pit of coastal sand soil area - Google Patents
A kind of Method on Dewatering of Foundation Pit of coastal sand soil area Download PDFInfo
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- CN105625445B CN105625445B CN201410617295.7A CN201410617295A CN105625445B CN 105625445 B CN105625445 B CN 105625445B CN 201410617295 A CN201410617295 A CN 201410617295A CN 105625445 B CN105625445 B CN 105625445B
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Abstract
A kind of Method on Dewatering of Foundation Pit of coastal sand soil area, it is characterised in that comprise the following steps：A surveying setting-outs and precast dewatering well point pipe, b punchings and installation well-point pipe, c, which is filled, fills out coarse sand filtrate, and d installation pumping equipments, e examinations are drawn water, and f formally draws water, and g foundation constructions and h withdraw well casing.The Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention has base pit dewatering step reasonable in design, simple to operate, and method is simple, easy construction, and dewatering effect is splendid and operating expenses is cheap, has the advantages of extensive promotional value.
Description
Technical field
The present invention relates to a kind of Method on Dewatering of Foundation Pit, is a kind of Method on Dewatering of Foundation Pit of coastal sand soil area specifically.
Background technology
Tend not to meet to be expected dewatering effect, and long construction period, drop using traditional construction method in coastal area
Water cost is high, and dewatering effect controllability is unstable, has considerable influence to construction in later period quality, deep pit monitor, project progress, therefore
For coastal sand region need to develop as early as possible it is a set of it is simple to operate, dewatering effect is good, scheme is simple, the foundation ditch of cost
Precipitation new technology.
The content of the invention
The purpose of the present invention, it is the base for proposing the fairly obvious coastal sand soil area of a kind of easy construction, dewatering effect
Cheat precipitation method.
To achieve the above object, technical solution of the invention is：
A kind of Method on Dewatering of Foundation Pit of coastal sand soil area, it is characterised in that comprise the following steps：
A, surveying setting-out and precast dewatering well point pipe
（1）Surveying setting-out, lays well point, and spacing, quantity, the depth of burying of well point laying are true according to calculating and arrangement and method for construction
It is fixed；
（2）Manage precast dewatering well point
Precipitation well point pipe（3）Made using pvc pipe, pvc pipe lower end is furnished with chimney filter（4）, it is drilled with plum blossom-shaped on chimney filter wall
A diameter of φ 10mm filter opening；Filter opening area is the 15%-25% of chimney filter surface area, and chimney filter wall is double-baged filter screen, and internal layer uses
Mesh is 30-50 holes/cm2Nylon yarn cloth fie screen, outer layer uses mesh as 3-10 holes/cm2Nylon yarn cloth coarse strainer, use
Iron wire fastens；
B, punching and installation well-point pipe
（1）Well point position ground cleaning
After well point is laid, well point position ground 500mm boundary inner surfaces surface dust, miscellaneous soil are excavated, form 500*500*
500mm shallow hole shapes, to facilitate well-point pipe to install；
（2）Punching uses 6 meters of long steel pipes and one 8 meters long PVC water pipes, and PVC water pipes are inserted in steel pipe；PVC water
Pipe upper end connects with high-pressure pump, and lower end is pressed into flat mouth-shaped, and concordant with steel pipe lower end, forms the sleeve pipe of punching；Punching
When, by sleeve pipe perpendicular to well point position ground, high-pressure hydraulic pump is first started, sand reaming sleeve pipe sinks under the impulse force of hydraulic pressure, behaviour
Make personnel to block in the middle part of sleeve pipe using spanner, and left-right rotation sleeve pipe, so that the quick punching of sleeve pipe is sunk；
（3）Precipitation well point pipe is installed
After sleeve pipe sinks down into designed elevation, close high-pressure pump and extract PVC water pipes in sleeve pipe immediately, and rapidly by precast dewatering
In well-point pipe insertion steel pipe, then pulling out steel pipe makes precipitation well point pipe be retained in sand, well-point pipe installation；
C, fill and fill out coarse sand filtrate
After well-point pipe installation, filled inserted in the space that well-point pipe is formed with ground using coarse sand immediately, until being put down in ground
Together；
Pumping equipment is installed d,
Water pump is routinely installed, notices that well-point pipe uses flexible pipe with water pump linkage section；
E, examination is drawn water
Turn on pump examination is taken out, and water outlet rule is first big after small, clear after first muddy；
F, formally draw water
Formal period of drawing water is needed to arrange special messenger to be responsible for maintenance, and the underground water of extraction is drained；
G, foundation construction
Constructed by scheme practice processes；
H, well casing is withdrawn
When need to withdraw precipitation well point pipe, after removing water pump facility, well-point pipe standpipe is cut off by foundation elevation.
The Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention can also be using following technical measures come further real
It is existing.
Foregoing method, wherein a diameter of 25mm of the precipitation well point pipe.
Foregoing method, wherein a diameter of 32mm of the chimney filter.
Foregoing method, wherein the long 500-1200mm of the chimney filter.
Foregoing method, wherein diameter >=48mm of the steel pipe.
Foregoing method, wherein diameter >=32mm of the PVC water pipes, and can insert in steel pipe.
Foregoing method, wherein when the well-point pipe is installed, well-point pipe is higher by 600mm than place ground, is easy to and water pump
Equipment is installed.
Foregoing method, wherein the underground water of the extraction drains into specific drainage ditch or using caliber 150mm's with pvc pipe
Pvc pipe drains into foundation ditch at a distance, to prevent water outlet recharge or rainwater from flowing into foundation ditch and influenceing dewatering effect.
After adopting the above technical scheme, the Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention has advantages below：
1st, base pit dewatering step is reasonable in design, simple to operate；
2nd, method is simple, easy construction, and dewatering effect is splendid；
3rd, operating expenses is cheap, has extensive promotional value.
Brief description of the drawings
Fig. 1 is the precipitation well point tubular construction schematic diagram of the embodiment of the present invention；
Fig. 2 is the precipitation well point pipe installation process A-D of embodiment of the present invention schematic diagram
In figure：1 steel pipe, 2PVC water pipes, 3 precipitation well point pipes, 4 chimney filters.
Embodiment
With reference to embodiments and its accompanying drawing illustrates further to the present invention.
Embodiment 1
The Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention, it is characterised in that comprise the following steps：
A, surveying setting-out and precast dewatering well point pipe
（1）Surveying setting-out, lays well point, and spacing, quantity, the depth of burying of well point laying are true according to calculating and arrangement and method for construction
It is fixed；
（2）Manage precast dewatering well point
Referring now to Fig. 1, Fig. 1 is the precipitation well point tubular construction schematic diagram of the embodiment of the present invention.As illustrated, the precipitation
Well-point pipe 3 is made using pvc pipe, caliber 25mm, and pvc pipe lower end is furnished with chimney filter 4, caliber 32mm, considers pipe range 800mm, chimney filter wall
On be drilled with the filter opening of a diameter of φ 10mm in plum blossom-shaped；Filter opening area is the 15%-25% of chimney filter surface area, and chimney filter wall is double-baged
Filter screen, internal layer use mesh as 40 holes/cm2Nylon yarn cloth fie screen, outer layer uses mesh as 8 holes/cm2Nylon yarn cloth it is thick
Filter screen, fastened with iron wire；
B, punching and installation well-point pipe
（1）Well point position ground cleaning
After well point is laid, well point position ground 500mm boundary inner surfaces surface dust, miscellaneous soil are excavated, form 500*500*
500mm shallow hole shapes, to facilitate well-point pipe to install；
（2）Punching uses one 6 meters long Φ 48mm steel pipes 1 and one 8 meters long Φ 32mmPVC water pipes 2, and PVC water pipes 2 are inserted
Enter in steel pipe 1；PVC water pipes upper end connects with high-pressure pump, and lower end is pressed into flat mouth-shaped, and concordant with the lower end of steel pipe 1, composition punching
The sleeve pipe in hole；During punching, by sleeve pipe perpendicular to well point position ground, high-pressure hydraulic pump is first started, the sand under the impulse force of hydraulic pressure
Reaming sleeve pipe sinks, and operating personnel are blocked in the middle part of sleeve pipe using spanner, and left-right rotation sleeve pipe, so that under the quick punching of sleeve pipe
It is heavy；
（3）Precipitation well point pipe is installed
Fig. 2 is the precipitation well point pipe installation process A-D of embodiment of the present invention schematic diagram.
After sleeve pipe sinks down into designed elevation（Place state A）, close high-pressure pump and extract PVC water pipes 2 in sleeve pipe immediately（Place's state
B）, and rapidly insert precast dewatering well point pipe 3 in steel pipe 1（Place state C）, then pulling out steel pipe 1 makes precipitation well point pipe 3（Place
State D）It is retained in sand, well-point pipe installation；
C, fill and fill out coarse sand filtrate
After well-point pipe installation, filled inserted in the space that well-point pipe 3 is formed with ground using coarse sand immediately, until being put down in ground
Together；
Pumping equipment is installed d,
Water pump is routinely installed, notices that well-point pipe uses flexible pipe with water pump linkage section；
E, examination is drawn water
Turn on pump examination is taken out, and water outlet rule is first big after small, clear after first muddy；
F, formally draw water
Formal period of drawing water needs to arrange special messenger to be responsible for maintenance；The underground water of extraction need to use diameter 150mmPVC pipes in a organized way
Drain into the outer specified point of foundation ditch（Ensure 35 meters minimum from foundation ditch）；
G, foundation construction
Constructed by scheme practice processes；
H, well casing is withdrawn
When need to withdraw precipitation well point pipe, after removing water pump facility, well-point pipe standpipe is cut off by foundation elevation.
The present invention has substantive distinguishing features and significant technological progress, the base pit dewatering side of coastal sand soil area of the invention
Method be it is a set of it is simple to operate, dewatering effect is good, scheme is simple, the base pit dewatering new technology of cost, have method it is simple,
Easy construction, low-cost, dewatering effect is splendid, it is low-cost the characteristics of, and there is extensive promotional value.
The Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention is in Fujian Province Pingtan comprehensive test region flowing water primary school, Tan Cheng
Applied in kindergarten, the multiple projects of Cao Yu schools, work well and ensure that project is smoothly implemented, significant effect, implemented
Unit, supervisor and construction unit's abundant affirmation.
Above example is used for illustrative purposes only, rather than limitation of the present invention, the technology people about technical field
Member, without departing from the spirit and scope of the present invention, can also make various conversion or change.Therefore, it is all equivalent
Technical scheme should also belong to scope of the invention, should be limited by each claim.
Claims (7)
1. a kind of Method on Dewatering of Foundation Pit of coastal sand soil area, it is characterised in that comprise the following steps：
A, surveying setting-out and precast dewatering well point pipe
（1）Surveying setting-out, lays well point, and spacing, quantity, the depth of burying of well point laying determine according to calculating and arrangement and method for construction；
（2）Manage precast dewatering well point
Precipitation well point pipe（3）Made using pvc pipe, pvc pipe lower end is furnished with chimney filter（4）, it is drilled with the straight of plum blossom-shaped on chimney filter wall
Footpath is φ 10mm filter opening；Filter opening area is the 15%-25% of chimney filter surface area, and chimney filter wall is double-baged filter screen, and internal layer uses mesh
For 30-50 holes/cm2Nylon yarn cloth fie screen, outer layer uses mesh as 3-10 holes/cm2Nylon yarn cloth coarse strainer, use iron wire
Fasten；
B, punching and installation well-point pipe
（1）Well point position ground cleaning
After well point is laid, well point position ground 500mm boundary inner surfaces surface dust, miscellaneous soil are excavated, form 500mm*500mm*
500mm shallow hole shapes, to facilitate well-point pipe to install；
（2）Punching uses 6 meters of long steel pipes（1）With one 8 meters long PVC water pipes（2）, by PVC water pipes（2）Insert steel pipe（1）
It is interior；PVC water pipes upper end connects with high-pressure pump, and lower end is pressed into flat mouth-shaped, and and steel pipe（1）Lower end is concordant, and composition punching is used
Sleeve pipe；During punching, by sleeve pipe perpendicular to well point position ground, high-pressure hydraulic pump is first started, the sand reaming under the impulse force of hydraulic pressure
Sleeve pipe sinks, and operating personnel are blocked in the middle part of sleeve pipe using spanner, and left-right rotation sleeve pipe, so that the quick punching of sleeve pipe is sunk；
（3）Precipitation well point pipe is installed
After sleeve pipe sinks down into designed elevation, close high-pressure pump and extract PVC water pipes in sleeve pipe immediately（2）, and rapidly by precast dewatering
Well-point pipe（3）Insert steel pipe（1）It is interior, then pull out steel pipe（1）Make precipitation well point pipe（3）It is retained in sand, the dewatering well
Point pipe（3）A diameter of 25mm, well-point pipe installation；
C, fill and fill out coarse sand filtrate
After well-point pipe installation, filled using coarse sand insert well-point pipe immediately（3）In the space formed with ground, until being put down in ground
Together；
Pumping equipment is installed d,
Water pump is routinely installed, notices that well-point pipe uses flexible pipe with water pump linkage section；
E, examination is drawn water
Turn on pump examination is taken out, and water outlet rule is first big after small, clear after first muddy；
F, formally draw water
Formal period of drawing water is needed to arrange special messenger to be responsible for maintenance, and the underground water of extraction is drained；
G, foundation construction
Constructed by scheme practice processes；
H, well casing is withdrawn
When need to withdraw precipitation well point pipe, after removing water pump facility, well-point pipe standpipe is cut off by foundation elevation.
2. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the chimney filter（4）It is straight
Footpath is 32mm.
3. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the chimney filter（4）It is long
500-1200mm。
4. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the steel pipe（1）It is straight
Footpath >=48mm.
5. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the PVC water pipes（2）'s
Diameter >=32mm, and steel pipe can be inserted（1）In.
6. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the well-point pipe installation
When, well-point pipe is higher by 600mm than place ground, is easy to install with pump equipment.
7. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the underground water of the extraction
Specific drainage ditch is drained into pvc pipe or foundation ditch is drained at a distance using caliber 150mm pvc pipe, to prevent water outlet recharge or rainwater
Flowing into foundation ditch influences dewatering effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410617295.7A CN105625445B (en) | 2014-11-06 | 2014-11-06 | A kind of Method on Dewatering of Foundation Pit of coastal sand soil area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410617295.7A CN105625445B (en) | 2014-11-06 | 2014-11-06 | A kind of Method on Dewatering of Foundation Pit of coastal sand soil area |
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| CN105625445A CN105625445A (en) | 2016-06-01 |
| CN105625445B true CN105625445B (en) | 2017-11-28 |
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| CN106088123B (en) * | 2016-08-16 | 2018-06-29 | 中国建筑第七工程局有限公司 | A kind of sand geology steel tube well drop water level device and its construction method |
| CN106337427B (en) * | 2016-09-26 | 2018-06-22 | 湖南科技大学 | A kind of deformation control method in the pre- dewatering construction of foundation pit |
| CN106544964A (en) * | 2016-11-08 | 2017-03-29 | 中铁六局集团天津铁路建设有限公司 | Road bed and lowering water level construction method during jacking box culvert |
| CN108049392A (en) * | 2017-11-16 | 2018-05-18 | 中国三冶集团有限公司 | A kind of steel plate pilework and water discharge method with drain function |
| CN109736340B (en) * | 2019-02-22 | 2021-03-05 | 宁蔚蔚 | Dewatering device and method for guaranteeing integrity of cushion layer by reserving dewatering well on foundation slab |
| CN109812223A (en) * | 2019-03-25 | 2019-05-28 | 五冶集团上海有限公司 | It is a kind of suitable for silt, the hole punched device of flour sand soil property and application method |
| CN111021508A (en) * | 2019-12-16 | 2020-04-17 | 南通永泰建设工程有限公司 | Underground drainage pipeline construction process |
| CN112609722A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Drainage and water leakage plugging method for deep foundation pit in sea reclamation area |
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