CN103215958A - Construction method of dewatering and retaining and protecting of deep foundation pit in expansive-soil area - Google Patents
Construction method of dewatering and retaining and protecting of deep foundation pit in expansive-soil area Download PDFInfo
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- CN103215958A CN103215958A CN2013101399480A CN201310139948A CN103215958A CN 103215958 A CN103215958 A CN 103215958A CN 2013101399480 A CN2013101399480 A CN 2013101399480A CN 201310139948 A CN201310139948 A CN 201310139948A CN 103215958 A CN103215958 A CN 103215958A
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Abstract
The invention discloses a construction method of dewatering and retaining and protecting of a deep foundation pit in an expansive-soil area. The construction method includes a first step of constructing densely-distributed bored concrete piles on the upstream face of the deep foundation pit; a second step of conducting shotcrete and protection on soil among the piles in the process of earth excavation; a third step of constructing anchor rods among the piles; a fourth step of conducting inner tube well dewatering construction on the foundation pit; a fifth step of constructing soil nailing walls on the downstream face of the foundation pit; and a sixth step of constructing a water-retaining cofferdam on the periphery of the foundation pit. The construction method of the dewatering and the retaining and protecting of the deep foundation pit in the expansive-soil area has the advantages that densely-distributed bored concrete piles are applied to the upstream face of the deep foundation pit, a combined bolting and shotcrete structure is applied to the earth among the piles, and a soil nailing wall combined bolting and shotcrete method is applied to the downstream face, so that potential safety hazards caused by slop instability of expansive soil can be effectively avoided. The construction method of the dewatering and the retaining and protecting of the deep foundation pit in the expansive-soil area further has the advantages of effectively saving resources and being economical and applicable due to the fact that the retaining and protecting in section is conducted according to the actual situation. In addition, the construction method of the dewatering and the retaining and protecting of the deep foundation pit in the expansive-soil area further has the advantages of effectively lowering the underground water level and being beneficial to foundation construction due to the fact that the foundation dip inner tube well dewatering construction is combined.
Description
Technical field
The present invention relates to a kind of swelled ground area deep foundation ditch building operations precipitation method, especially a kind of swelled ground area deep foundation pit precipitation and construction method for supporting.
Background technology
Development along with the modern city construction; building density is strengthening day by day; the building operations space is subjected to restriction to a certain degree; normal operation in order to ensure construction project; and protection adjacent building; structure; the safe handling of underground utilities etc.; often needing that base pit engineering is carried out foundation ditch handles and supporting; in the expansive soil distributed area; when the excavation of foundation pit degree of depth surpasses the buried depth of expansive soil; the expansive soil rainwater expands; the characteristic that dehydration is shunk will constitute the most direct threat to the stability of excavation slope; cause the example of side slope unstability of common occurrence thus; expansive soil undisturbed soil can be also different with soil permeability after disturbance is reinvented; the height of the water content of expansive soil is in soil body penetration; stress; strain stress relation and shear strength have close and complicated relation, so expansive soil area deep foundation pit precipitation and pattern foundation pit supporting structure are one technical barrier to be solved is arranged.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of swelled ground area deep foundation pit precipitation and construction method for supporting, can effectively prevent the potential safety hazard that causes because of the expansive soil unstability in the swelled ground area deep foundation ditch operation process, guarantees that construction normally carries out.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of swelled ground area deep foundation pit precipitation and construction method for supporting may further comprise the steps:
The first step: the deep foundation ditch upstream face concrete spouting pile driving construction that gathers;
Second step: in the soil excavation process, carry out the inter-pile soil spray and protect;
The 3rd step: anchor bolt construction between stake;
The 4th step: tube well dewatering construction in the deep foundation ditch;
The 5th step: deep foundation ditch back side construction of soil-nailed wall;
The 6th step: water-retaining cofferdam construction around the deep foundation ditch;
The described first step comprise bury that casing, slurrying, rig are in place underground, pore-forming, reinforcing cage fabrication and installation and concrete spouting.
The sand factor of mud is smaller or equal to 8% in the described pore-forming metapore, and mud viscosity is smaller or equal to 28S, and mud balance is less than 1.25.
The slump of described perfusion is 180-220mm, and water/binder ratio is 0.5-0.55.
Described second step comprises deep pit digging, hole wall hanging net and sprayed mortar, finishes sprayed mortar in deep pit digging 2-3 hour.
Described the 3rd step comprises boring, steel wire bundle making, slip casting, inserting or withdrawing sleeves and anchorage cable stretching, and described boring step adopts hydraulic pressure boring, and the water/binder ratio of the cement paste that described slip casting step adopts is 0.45-0.5, and grouting pressure is controlled at 0.3M.
Described the 4th step comprise determine that the precipitation well location is put, pore-forming, clear hole and water pump is installed.
Described the 5th step comprises soil nailing making, pore-forming, slip casting, steel mesh reinforcement establishment, sprayed mortar surface layer and bears down on one, described soil nailing adopts welded steel pipe to make, its sidewall upper edge uniform diameter of its axis is the injected hole of 5-15mm, and the welded steel pipe that seal the bottom is driven underground.
Described slip casting step comprises hole, bottom grouting and mud jacking clearly, adopts neat slurry, and water/binder ratio is 0.5-0.55.
Described the 6th step is included in deep foundation ditch and goes out to build water-retaining cofferdam for outer 1.5 meters, the basis rammed earth of water-retaining cofferdam, and on the basis, build waterwall by laying bricks or stones.
Beneficial effect of the present invention is as follows: adopt the cast-in-place concrete pile that gathers at the deep foundation ditch upstream face, inter-pile soil combined bolting and shotcrete structure, back side adopts soil nailing wall combined bolting and shotcrete method, effectively prevent from the potential safety hazard brought because of the expansive soil slope unstability from, effectively to economize on resources according to actual conditions segmentation supporting, economic and practical, in conjunction with tube well dewatering measure in the foundation ditch, effectively dewatering is convenient to carry out foundation construction simultaneously.
The specific embodiment
In sum, the invention discloses a kind of swelled ground area deep foundation pit precipitation and construction method for supporting, it is characterized in that: may further comprise the steps:
The first step: the deep foundation ditch upstream face concrete spouting pile driving construction that gathers; The described first step comprise bury that casing, slurrying, rig are in place underground, pore-forming, reinforcing cage fabrication and installation and concrete spouting.The sand factor of mud is smaller or equal to 8% in the described pore-forming metapore, and mud viscosity is smaller or equal to 28S, and mud balance is less than 1.25.
The slump of described perfusion is 180-220mm, and water/binder ratio is 0.5-0.55.
Second step: in the soil excavation process, carry out the inter-pile soil spray and protect; Described second step comprises deep pit digging, hole wall hanging net and sprayed mortar, finishes sprayed mortar in deep pit digging 2-3 hour.
The 3rd step: anchor bolt construction between stake; Described the 3rd step comprises boring, steel wire bundle making, slip casting, inserting or withdrawing sleeves and anchorage cable stretching, and described boring step adopts hydraulic pressure boring, and the water/binder ratio of the cement paste that described slip casting step adopts is 0.45-0.5, and grouting pressure is controlled at 0.3M.
The 4th step: tube well dewatering construction in the deep foundation ditch; Because the expansive soil permeability is minimum, it is little to cheat outer dewatering effect, so precipitation adopts tube well dewatering in the technical ability, gutter and collecting well are set around deep foundation ditch simultaneously, employing is fallen, row, every the precipitation method that combines, effective dewatering, this step comprises determines that the precipitation well location puts, pore-forming, clear hole and installation water pump, at first determine that according to actual conditions each precipitation well location puts in the concrete work progress, adopt circulation to be drilled to the hole then, the aperture generally is controlled at 600-800mm, uses mud off, clear immediately hole behind the pore-forming, and the installation well casing, the filter pipe part of well casing should be placed in the proper range in aquifer, and at well casing springtail rubble filtrate between hole wall, water pump money is installed with the clear filter well of compressed air, is installed behind the water pump and can come into operation after water pump and control system thereof detected.
The 5th step: deep foundation ditch back side construction of soil-nailed wall; Described the 5th step comprises soil nailing making, pore-forming, slip casting, steel mesh reinforcement establishment, sprayed mortar surface layer and bears down on one, described soil nailing adopts welded steel pipe to make, its sidewall upper edge uniform diameter of its axis is the injected hole of 5-15mm, and the welded steel pipe that seal the bottom is driven underground.
The steel mesh reinforcement of being worked out is generally two-way layout, the adjacent steel bar end 500mm that staggers, steel mesh reinforcement adopts the screw-thread steel overlap joint between welded steel pipe, the slip casting step comprises hole, bottom grouting and mud jacking clearly, adopt neat slurry, water/binder ratio is 0.5-0.55, and construction artificial fluid concrete of employing or construction of shotcrete bear down on one at deep foundation ditch periphery top, thickness remains on 80-100mm, and arrangement of reinforcement is identical in the steel mesh reinforcement arrangement of reinforcement.Carry out the bright worker of applying of foundation ditch after deep foundation ditch back side construction of soil-nailed wall finishes, sump is set in deep foundation ditch, and the excavation gutter, the gutter is communicated with in sump, and intermittently draws water in sump with slush pump.
The 6th step: water-retaining cofferdam construction around the foundation ditch; Be included in deep foundation ditch and go out to build water-retaining cofferdam for outer 1.5 meters, the basis rammed earth of water-retaining cofferdam, and on the basis, build waterwall by laying bricks or stones, the high 300mm of waterwall, wide 240mm.
Adopt the cast-in-place concrete pile that gathers at the deep foundation ditch upstream face, inter-pile soil combined bolting and shotcrete structure, back side adopts soil nailing wall combined bolting and shotcrete method, effectively prevent from the potential safety hazard brought because of the expansive soil slope unstability from, effectively to economize on resources according to actual conditions segmentation supporting, economic and practical, in conjunction with tube well dewatering measure in the deep foundation ditch, effectively dewatering is convenient to carry out foundation construction simultaneously.
Claims (10)
1. swelled ground area deep foundation pit precipitation and construction method for supporting is characterized in that: may further comprise the steps:
The first step: the deep foundation ditch upstream face concrete spouting pile driving construction that gathers;
Second step: in the soil excavation process, carry out the inter-pile soil spray and protect;
The 3rd step: anchor bolt construction between stake;
The 4th step: tube well dewatering construction in the deep foundation ditch;
The 5th step: deep foundation ditch back side construction of soil-nailed wall;
The 6th step: water-retaining cofferdam construction around the deep foundation ditch.
2. swelled ground area deep foundation pit precipitation according to claim 1 and construction method for supporting is characterized in that: the described first step comprise bury that casing, slurrying, rig are in place underground, pore-forming, reinforcing cage fabrication and installation and concrete spouting.
3. swelled ground area deep foundation pit precipitation according to claim 2 and construction method for supporting is characterized in that: the sand factor of mud is smaller or equal to 8% in the described pore-forming metapore, and mud viscosity is smaller or equal to 28S, and mud balance is less than 1.25.
4. swelled ground area deep foundation pit precipitation according to claim 2 and construction method for supporting is characterized in that: the slump of described perfusion is 180-220mm, and water/binder ratio is 0.5-0.55.
5. swelled ground area deep foundation pit precipitation according to claim 1 and construction method for supporting is characterized in that: described second step comprises deep pit digging, hole wall hanging net and sprayed mortar, finishes sprayed mortar in deep pit digging 2-3 hour.
6. swelled ground area deep foundation pit precipitation according to claim 1 and construction method for supporting, it is characterized in that: described the 3rd step comprises boring, steel wire bundle making, slip casting, inserting or withdrawing sleeves and anchorage cable stretching, described boring step adopts hydraulic pressure boring, the water/binder ratio of the cement paste that described slip casting step adopts is 0.45-0.5, and grouting pressure is controlled at 0.3M.
7. swelled ground area deep foundation pit precipitation according to claim 1 and construction method for supporting is characterized in that: described the 4th step comprise determine that the precipitation well location is put, pore-forming, clear hole and water pump is installed.
8. swelled ground area deep foundation pit precipitation according to claim 1 and construction method for supporting, it is characterized in that: described the 5th step comprises soil nailing making, pore-forming, slip casting, steel mesh reinforcement establishment, sprayed mortar surface layer and bears down on one, described soil nailing adopts welded steel pipe to make, its sidewall upper edge uniform diameter of its axis is the injected hole of 5-15mm, and the welded steel pipe that seal the bottom is driven underground.
9. swelled ground area deep foundation pit precipitation according to claim 8 and construction method for supporting is characterized in that: described slip casting step comprises hole, bottom grouting and mud jacking clearly, adopts neat slurry, and water/binder ratio is 0.5-0.55.
10. swelled ground area deep foundation pit precipitation according to claim 1 and construction method for supporting is characterized in that: described the 6th step is included in deep foundation ditch and goes out to build water-retaining cofferdam for outer 1.5 meters, the basis rammed earth of water-retaining cofferdam, and on the basis, build waterwall by laying bricks or stones.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101399480A CN103215958A (en) | 2013-04-22 | 2013-04-22 | Construction method of dewatering and retaining and protecting of deep foundation pit in expansive-soil area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101399480A CN103215958A (en) | 2013-04-22 | 2013-04-22 | Construction method of dewatering and retaining and protecting of deep foundation pit in expansive-soil area |
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| CN103215958A true CN103215958A (en) | 2013-07-24 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831737A (en) * | 2015-04-29 | 2015-08-12 | 孔志坚 | Construction method of basement support for subway station |
| CN106088121A (en) * | 2016-06-07 | 2016-11-09 | 中国十七冶集团有限公司 | The micro-expansion soil Method on Dewatering of Foundation Pit that a kind of subsoil water soaks |
| CN107090837A (en) * | 2017-06-29 | 2017-08-25 | 中国建筑第二工程局有限公司 | Pit-in-pit reinforced concrete retaining wall composite supporting structure and construction method thereof |
| CN110029673A (en) * | 2019-04-16 | 2019-07-19 | 潮峰钢构集团有限公司 | Anchor cable drilling pilework and its enclosing method suitable for Extra-Deep Foundation Pit |
| CN110359473A (en) * | 2019-07-24 | 2019-10-22 | 青岛东建建设有限公司 | A kind of closed precipitation environmental protection and energy saving construction technology of deep basal pit |
| CN112553991A (en) * | 2020-11-30 | 2021-03-26 | 中交路桥建设有限公司 | Weak expansive soil old roadbed reinforcing method and widening method |
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| CN1348037A (en) * | 2000-10-18 | 2002-05-08 | 首钢总公司 | Continuous wall foundation pit supporting method with short brad |
| CN1540107A (en) * | 2003-04-26 | 2004-10-27 | 曾宪明 | Soft soil slope soil nail supporting construction method |
| KR100468034B1 (en) * | 2002-06-19 | 2005-01-27 | 주식회사 도담이앤씨 | Construction Method of Reinforced Earth Retaining-Wall for using Anchoring |
| CN101225661A (en) * | 2008-02-02 | 2008-07-23 | 浙江环宇建设集团有限公司 | Pile-anchor foundation ditch supporting construction method |
| CN101736732A (en) * | 2009-12-17 | 2010-06-16 | 上海隧道工程股份有限公司 | Pressure and water reduction construction method of ultra-deep foundation pit confined water |
| CN101892667A (en) * | 2010-07-23 | 2010-11-24 | 中国建筑第二工程局有限公司 | Foundation pit supporting device and construction method |
| CN102828518A (en) * | 2012-09-17 | 2012-12-19 | 中国建筑第二工程局有限公司 | Prestressed anchor cable anchoring structure of manual hole digging support pile and construction method thereof |
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2013
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| CN1348037A (en) * | 2000-10-18 | 2002-05-08 | 首钢总公司 | Continuous wall foundation pit supporting method with short brad |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831737A (en) * | 2015-04-29 | 2015-08-12 | 孔志坚 | Construction method of basement support for subway station |
| CN106088121A (en) * | 2016-06-07 | 2016-11-09 | 中国十七冶集团有限公司 | The micro-expansion soil Method on Dewatering of Foundation Pit that a kind of subsoil water soaks |
| CN107090837A (en) * | 2017-06-29 | 2017-08-25 | 中国建筑第二工程局有限公司 | Pit-in-pit reinforced concrete retaining wall composite supporting structure and construction method thereof |
| CN110029673A (en) * | 2019-04-16 | 2019-07-19 | 潮峰钢构集团有限公司 | Anchor cable drilling pilework and its enclosing method suitable for Extra-Deep Foundation Pit |
| CN110029673B (en) * | 2019-04-16 | 2023-10-13 | 潮峰钢构集团有限公司 | Anchor cable bored pile structure suitable for deep foundation pit support and support method thereof |
| CN110359473A (en) * | 2019-07-24 | 2019-10-22 | 青岛东建建设有限公司 | A kind of closed precipitation environmental protection and energy saving construction technology of deep basal pit |
| CN112553991A (en) * | 2020-11-30 | 2021-03-26 | 中交路桥建设有限公司 | Weak expansive soil old roadbed reinforcing method and widening method |
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Application publication date: 20130724 |