CN105625445A - Foundation pit dewatering method in coastal sandy soil region - Google Patents
Foundation pit dewatering method in coastal sandy soil region Download PDFInfo
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- CN105625445A CN105625445A CN201410617295.7A CN201410617295A CN105625445A CN 105625445 A CN105625445 A CN 105625445A CN 201410617295 A CN201410617295 A CN 201410617295A CN 105625445 A CN105625445 A CN 105625445A
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Abstract
The invention discloses a foundation pit dewatering method in a coastal sandy soil region. The method is characterized by comprising the steps of: (a) surveying, setting out and prefabrication of a dewatering well point pipe; (b) punching and installation of the well point pipe; (c) filling of rough sand filtrates; (d) installation of water pumping equipment; (e) trial water pumping; (f) formal water pumping; (g) foundation construction; and (h) evacuation of the well point. The foundation pit dewatering method in the coastal sandy soil region has the advantages of reasonable design of foundation pit dewatering steps, simple operation, simple method, convenience for construction, better dewatering effect, low construction cost and wide promotion value.
Description
Technical field
The present invention relates to a kind of Method on Dewatering of Foundation Pit, specifically, be the Method on Dewatering of Foundation Pit of a kind of coastal sand soil area.
Background technology
Adopt traditional construction method to tend not to meet expection dewatering effect in coastal area, and long construction period, precipitation cost are high, dewatering effect controllability is unstable, construction in later period quality, deep pit monitor, project progress are all had considerable influence, thus for coastal sand region need to develop as early as possible a set of simple to operate, dewatering effect is good, scheme is simple, the base pit dewatering new technology of cost.
Summary of the invention
The purpose of the present invention, is in that to propose the Method on Dewatering of Foundation Pit of the fairly obvious coastal sand soil area of a kind of easy construction, dewatering effect.
For achieving the above object, the technical solution of the present invention is:
The Method on Dewatering of Foundation Pit of a kind 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 the spacing of well point laying, quantity, the depth of burying are determined according to calculating and arrangement and method for construction;
(2) precast dewatering well point pipe
Precipitation well point pipe (3) adopts pvc pipe to make, and pvc pipe lower end is furnished with chimney filter (4), and chimney filter wall is drilled with the filter opening that diameter is �� 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, and internal layer adopts mesh to be 30-50 hole/cm2Nylon yarn cloth fie screen, outer layer adopt mesh be 3-10 hole/cm2Nylon yarn cloth coarse strainer, fasten with iron wire;
B, punching and installation well-point pipe
(1) well point position ground cleaning
Well point position ground 500mm boundary inner surface surface dust, assorted soil are excavated after laying by well point, form 500*500*500mm shallow hole shape, to facilitate well-point pipe to install;
(2) punching adopts 6 meters of long steel pipes and 8 meters long PVC water pipes, is inserted by PVC water pipe 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, the sleeve pipe of composition punching; During punching, sleeve pipe being perpendicular to well point position ground, first start high-pressure hydraulic pump, under the impulse force of hydraulic pressure, sand reaming sleeve pipe sinks, and operator adopt spanner to block in the middle part of sleeve pipe, 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 pipe in sleeve pipe immediately, and rapidly precast dewatering well point pipe is inserted in steel pipe, then pull out steel pipe and make precipitation well point pipe be retained in sand, well-point pipe installation;
Coarse sand filtrate is filled out in c, filling
After well-point pipe is installed, coarse sand is adopted to fill in the space inserting well-point pipe and ground formation immediately, until concordant in ground;
D, installation pumping equipment
Water pump is installed routinely, notices that well-point pipe adopts flexible pipe with water pump linkage section;
E, examination are drawn water
Turn on pump examination is taken out, and water outlet rule is first big after small, first muddy rear clear;
F, formally draw water
Need during formally drawing water to arrange special messenger to be responsible for maintenance, the subsoil water of extraction is drained;
G, foundation construction
Construct by scheme practice processes;
H, withdraw well casing
When need to withdraw precipitation well point pipe, after removing water pump facility, well-point pipe standpipe cuts off by foundation elevation.
The Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention can also be further achieved by the following technical measures.
Aforesaid method, the diameter of wherein said precipitation well point pipe is 25mm.
Aforesaid method, the diameter of wherein said chimney filter is 32mm.
Aforesaid method, the long 500-1200mm of wherein said chimney filter.
Aforesaid method, the diameter >=48mm of wherein said steel pipe.
Aforesaid method, the diameter >=32mm of wherein said PVC water pipe, and can insert in steel pipe.
Aforesaid method, when wherein said well-point pipe is installed, well-point pipe exceeds 600mm than place ground, it is simple to install with pump equipment.
Aforesaid method, the subsoil water pvc pipe of wherein said extraction drains into specific drainage ditch or adopts the pvc pipe of caliber 150mm to drain into foundation ditch at a distance, to prevent water outlet from recharging or rainwater flows into foundation ditch and affects dewatering effect.
After adopting technique scheme, the Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention has the advantage that
1, base pit dewatering step is reasonable in design, simple to operate;
2, method is simple, easy construction, and dewatering effect is splendid;
3, operating expenses is cheap, has promotional value widely.
Accompanying drawing explanation
Fig. 1 is the precipitation well point tubular construction schematic diagram of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the precipitation well point pipe installation process A-D of the embodiment of the present invention
In figure: 1 steel pipe, 2PVC water pipe, 3 precipitation well point pipes, 4 chimney filters.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is illustrated further.
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 the spacing of well point laying, quantity, the depth of burying are determined according to calculating and arrangement and method for construction;
(2) precast dewatering well point pipe
Referring now to the precipitation well point tubular construction schematic diagram that Fig. 1, Fig. 1 are the embodiment of the present invention. As it can be seen, described precipitation well point pipe 3 adopts pvc pipe to make, caliber 25mm, pvc pipe lower end is furnished with chimney filter 4, caliber 32mm, considers pipe range 800mm, chimney filter wall is drilled with the filter opening that diameter is �� 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, and internal layer adopts mesh to be 40 holes/cm2Nylon yarn cloth fie screen, outer layer adopt mesh be 8 holes/cm2Nylon yarn cloth coarse strainer, fasten with iron wire;
B, punching and installation well-point pipe
(1) well point position ground cleaning
Well point position ground 500mm boundary inner surface surface dust, assorted soil are excavated after laying by well point, form 500*500*500mm shallow hole shape, to facilitate well-point pipe to install;
(2) punching adopts 6 meters long �� 48mm steel pipes 1 and 8 meters long �� 32mmPVC water pipes 2, is inserted by PVC water pipe 2 in steel pipe 1; PVC water pipe upper end connects with high-pressure pump, and lower end is pressed into flat mouth-shaped, and concordant with steel pipe 1 lower end, the sleeve pipe of composition punching; During punching, sleeve pipe being perpendicular to well point position ground, first start high-pressure hydraulic pump, under the impulse force of hydraulic pressure, sand reaming sleeve pipe sinks, and operator adopt spanner to block in the middle part of sleeve pipe, and left-right rotation sleeve pipe, so that the quick punching of sleeve pipe is sunk;
(3) precipitation well point pipe is installed
Fig. 2 is the schematic diagram of the precipitation well point pipe installation process A-D of the embodiment of the present invention.
After sleeve pipe sinks down into designed elevation (place state A), close high-pressure pump and extract PVC water pipe 2(place state B in sleeve pipe immediately), and rapidly precast dewatering well point pipe 3 is inserted (place state C) in steel pipe 1, then pull out steel pipe 1 and make precipitation well point pipe 3(place state D) it is retained in sand, well-point pipe installation;
Coarse sand filtrate is filled out in c, filling
After well-point pipe is installed, coarse sand is adopted to fill in the space inserting well-point pipe 3 and ground formation immediately, until concordant in ground;
D, installation pumping equipment
Water pump is installed routinely, notices that well-point pipe adopts flexible pipe with water pump linkage section;
E, examination are drawn water
Turn on pump examination is taken out, and water outlet rule is first big after small, first muddy rear clear;
F, formally draw water
Need during formally drawing water to arrange special messenger to be responsible for maintenance; The subsoil water extracted need to adopt diameter 150mmPVC pipe to drain into the outer specified point (guaranteeing minimum 35 meters away from foundation ditch be) of foundation ditch in a organized way;
G, foundation construction
Construct by scheme practice processes;
H, withdraw well casing
When need to withdraw precipitation well point pipe, after removing water pump facility, well-point pipe standpipe cuts off by foundation elevation.
The present invention has substantive distinguishing features and significant technological progress, the Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention be a set of simple to operate, dewatering effect is good, scheme is simple, the base pit dewatering new technology of cost, there is method simple, easy construction, low cost, dewatering effect is splendid, the feature of low cost, and has promotional value widely.
The Method on Dewatering of Foundation Pit of the coastal sand soil area of the present invention is applied in Pingtan, Fujian Province comprehensive test region flowing water primary school, city, pool kindergarten, the multiple project of Cao Yu school, respond well ensure that project is implemented smoothly, effect is notable, obtains exploiting entity, supervisor and construction unit's abundant affirmation.
Above example is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, it is also possible to make various conversion or change. Therefore, all equivalent technical schemes also should belong to scope of the invention, should be limited by each claim.
Claims (8)
1. the Method on Dewatering of Foundation Pit of a 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 the spacing of well point laying, quantity, the depth of burying are determined according to calculating and arrangement and method for construction;
(2) precast dewatering well point pipe
Precipitation well point pipe (3) adopts pvc pipe to make, and pvc pipe lower end is furnished with chimney filter (4), and chimney filter wall is drilled with the filter opening that diameter is �� 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, and internal layer adopts mesh to be 30-50 hole/cm2Nylon yarn cloth fie screen, outer layer adopt mesh be 3-10 hole/cm2Nylon yarn cloth coarse strainer, fasten with iron wire;
B, punching and installation well-point pipe
(1) well point position ground cleaning
Well point position ground 500mm boundary inner surface surface dust, assorted soil are excavated after laying by well point, form 500*500*500mm shallow hole shape, to facilitate well-point pipe to install;
(2) punching adopts one 6 meters long steel pipes (1) and 8 meters long PVC water pipes (2), is inserted by PVC water pipe (2) in steel pipe (1); PVC water pipe upper end connects with high-pressure pump, and lower end is pressed into flat mouth-shaped, and concordant with steel pipe (1) lower end, the sleeve pipe of composition punching; During punching, sleeve pipe being perpendicular to well point position ground, first start high-pressure hydraulic pump, under the impulse force of hydraulic pressure, sand reaming sleeve pipe sinks, and operator adopt spanner to block in the middle part of sleeve pipe, 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 pipe (2) in sleeve pipe immediately, and rapidly precast dewatering well point is managed in (3) insertion steel pipe (1), then pull out steel pipe (1) and make precipitation well point pipe (3) be retained in sand, well-point pipe installation;
Coarse sand filtrate is filled out in c, filling
After well-point pipe is installed, coarse sand is adopted to fill in the space inserting well-point pipe (3) and ground formation immediately, until concordant in ground;
D, installation pumping equipment
Water pump is installed routinely, notices that well-point pipe adopts flexible pipe with water pump linkage section;
E, examination are drawn water
Turn on pump examination is taken out, and water outlet rule is first big after small, first muddy rear clear;
F, formally draw water
Need during formally drawing water to arrange special messenger to be responsible for maintenance, the subsoil water of extraction is drained;
G, foundation construction
Construct by scheme practice processes;
H, withdraw well casing
When need to withdraw precipitation well point pipe, after removing water pump facility, well-point pipe standpipe cuts 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 diameter of described precipitation well point pipe (3) is 25mm.
3. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the diameter of described chimney filter (4) is 32mm.
4. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that described chimney filter (4) long 500-1200mm.
5. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the diameter >=48mm of described steel pipe (1).
6. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that the diameter >=32mm of described PVC water pipe (2), and can insert in steel pipe (1).
7. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterised in that when described well-point pipe is installed, well-point pipe exceeds 600mm than place ground, it is simple to install with pump equipment.
8. the Method on Dewatering of Foundation Pit of coastal sand soil area as claimed in claim 1, it is characterized in that, the subsoil water pvc pipe of described extraction drains into specific drainage ditch or adopts the pvc pipe of caliber 150mm to drain into foundation ditch at a distance, to prevent water outlet from recharging or rainwater flows into foundation ditch and affects dewatering effect.
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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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| 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 true CN105625445A (en) | 2016-06-01 |
| CN105625445B CN105625445B (en) | 2017-11-28 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106088123A (en) * | 2016-08-16 | 2016-11-09 | 中国建筑第七工程局有限公司 | A kind of sand geology steel tube well fall water level device and construction method thereof |
| CN106337427A (en) * | 2016-09-26 | 2017-01-18 | 湖南科技大学 | Deformation control method applied to foundation pit pre-dewatering construction |
| 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 |
| CN109736340A (en) * | 2019-02-22 | 2019-05-10 | 宁蔚蔚 | A kind of sole plate reserves the dewatering device and method of dewatering well guarantee bed course integrality |
| 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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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106088123A (en) * | 2016-08-16 | 2016-11-09 | 中国建筑第七工程局有限公司 | A kind of sand geology steel tube well fall water level device and construction method thereof |
| 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 |
| CN106337427A (en) * | 2016-09-26 | 2017-01-18 | 湖南科技大学 | Deformation control method applied to foundation pit pre-dewatering construction |
| 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 |
| CN109736340A (en) * | 2019-02-22 | 2019-05-10 | 宁蔚蔚 | A kind of sole plate reserves the dewatering device and method of dewatering well guarantee bed course integrality |
| 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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| CN105625445B (en) | 2017-11-28 |
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