CN103031849B - Method for construction of arranging dewatering well in foundation pit and flexibly closing dewatering well - Google Patents
Method for construction of arranging dewatering well in foundation pit and flexibly closing dewatering well Download PDFInfo
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- CN103031849B CN103031849B CN201210579869.7A CN201210579869A CN103031849B CN 103031849 B CN103031849 B CN 103031849B CN 201210579869 A CN201210579869 A CN 201210579869A CN 103031849 B CN103031849 B CN 103031849B
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- dewatering well
- construction
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- dewatering
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- 238000010276 construction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000013589 supplement Substances 0.000 claims description 9
- 239000004793 Polystyrene Substances 0.000 claims description 7
- 229920002223 polystyrene Polymers 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000004078 waterproofing Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 210000003205 muscle Anatomy 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003643 water by type Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 9
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 4
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 4
- 238000005336 cracking Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Abstract
The invention belongs to the technical field of constructional engineering, and in particular relates to a method for construction of arranging a dewatering well in a foundation pit and flexibly closing the dewatering well. The following steps are adopted: 1, arranging the dewatering well in the foundation pit; 2, digging a pit of a buffer layer; 3, constructing a concrete cushion and a waterproof layer; 4, constructing a foundation raft; 5, filling the dewatering well; 6, laying the buffer layer; 7, filling and pouring a concrete cushion; 8, reserving the waterproof layer and constructing a protecting layer of the waterproof layer; 9, adhering expansive type sealing rubber strips; 10, bound connecting the foundation raft reinforcing steel bars; and 11, supplementarily pouring the foundation raft. The method has the beneficial effects that the method of construction of flexibly closing the dewatering well in the foundation pit is adopted, the problem that the foundation raft and the waterproof layer are cracked due to hogging moment above the dewatering well can be effectively solved, so that the requirement of the method for construction on arranging the dewatering well in a huge foundation pit is satisfied, and compared with a conventional dewatering method, the method can save 2/3 dewatering cost, can shorten the construction period and meets the efficient energy-saving green construction requirements.
Description
Technical field
The construction method that the present invention relates to arrange in a kind of foundation ditch dewatering well and the flexible sealing of dewatering well, belongs to construction engineering technical field.
Background technology
At present, China residential quarters all arrange the underground garage that covers building line scope, thereby building foundation pit area several times are expanded, and the way of traditional foundation ditch periphery dewatering well cannot meet precipitation requirement, therefore generally adopts the way of arranging dewatering well precipitation in foundation ditch.But precipitation borehole wall bearing capacity is far above natural ground, after dewatering well sealing, because pipe well wall produces hogging moment to its top waterproofing course and basic raft plate, often cause waterproofing course and basic raft plate to ftracture and seepage becomes a national technical barrier of builing industry.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of safe and reliable, economical rationality, in workable foundation ditch, arrange the construction method of dewatering well and the flexible sealing of dewatering well, solve the precipitation borehole wall and produced waterproofing course and the basic raft plate cracking seepage guardian technique difficult problem that hogging moment causes, for arranging in huge foundation ditch that dewatering well provides reliable technical guarantee.
The present invention for the technical scheme that its technical problem of solution adopts is: in described foundation ditch, arrange the construction method of dewatering well and the flexible sealing of dewatering well, it is characterized in that taking following steps:
1) in foundation ditch, arrange dewatering well;
2) dig cushion coat pit: expand to surrounding from dewatering well center line and within the scope of 500 ㎜～700 ㎜, add deep excavation 50 ㎜～100 ㎜ pits;
3) concrete cushion and construction of waterproof layer: concreting bed course is to pit edge, at concrete cushion top laying water-proof coiled material to pit edge;
4) basic raft plate construction: stay and establish concrete construction joint at 2～3 times of width places that extend to basic raft plate lapped length of steel bar to surrounding from dewatering well center line, and the reserved reinforcing bar that meets the overlap joint that mutually staggers;
5) tamp dewatering well: after foundation pit dewatering, in dewatering well, adopt medium sand to tamp, in the scope from pit soffit to the dewatering well degree of depth 1000 ㎜～2000 ㎜, adopt C30 expansive concrete to tamp;
6) lay cushion coat: laying depth is the extruded polystyrene board of 50 ㎜～100 ㎜ in pit;
7) supplement concreting bed course: pouring concrete bed course after extruded polystyrene board upper supplementary;
8) reserved waterproofing course and topping construction thereof: mend waterproof roll after laying on rear pouring concrete bed course, and tightly paste concreting topping on waterproof roll and on rear benefit waterproof roll with waterproof roll overlap joint 200mm;
9) paste intumescent watertight rubber bar: paste intumescent watertight rubber bar at concrete construction joint depth of section middle part;
10) colligation connects basic raft slab muscle: carry out bar splicing connection according to the adjacent joint center 1.35 times of lapped length of steel bar that mutually stagger;
11) supplement and water underpin raft plate: adopt than the expansive concrete that waters a strength grade of underpin raft plate hight and supplement rear casting foundation raft plate.
The invention has the beneficial effects as follows:
Adopt the flexible closure construction method of precipitation well in foundation pit, can effectively solve basic raft plate and a waterproof layer cracking difficult problem that dewatering well top hogging moment causes, meet the construction method requirement that dewatering well is set in huge foundation ditch, save precipitation expense 2/3 than traditional precipitation method, can shorten construction period, and meet energy-efficient green construction requirement.
Brief description of the drawings
Fig. 1 is the flexible closure construction layout plan of precipitation well in foundation pit.
Fig. 2 is the A-A cross-sectional view of Fig. 1.
In figure: 1, dewatering well 2, pit 3, concrete construction joint 4, rear casting foundation raft plate 5, concrete cover 6, extruded polystyrene board 7, C30 expansive concrete 8, medium sand 9, concrete cushion 10, rear pouring concrete bed course 11, waterproof roll 12, rear benefit waterproof roll 13, basic raft plate 14, reinforcing bar 15, intumescent watertight rubber bar.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described further:
As depicted in figs. 1 and 2, in foundation ditch of the present invention, arrange the construction method of dewatering well and the flexible sealing of dewatering well, take following steps:
1), according to precipitation design attitude, in foundation ditch, arrange dewatering well 1;
2) dig cushion coat pit: be excavated at the bottom of design of foundation pit after absolute altitude, expand 500 ㎜ scopes from dewatering well 1 center line to surrounding and add deep excavation 50 ㎜ pits 2;
3) concrete cushion and construction of waterproof layer: concreting bed course 9 is to pit 2 edges, at concrete cushion 9 top laying water-proof coiled materials 11 to pit 2 edges;
4) basic raft plate construction: stay and establish concrete construction joint 3 at 2 times of width places that extend to basic raft plate 13 lapped length of steel bar to surrounding from dewatering well 1 center line, and the reserved reinforcing bar 14 that meets the overlap joint that mutually staggers;
5) tamp dewatering well: after foundation pit dewatering, the interior employing medium sand 8 of dewatering well 1 tamps, and in the scope from pit 2 soffits to dewatering well 1 degree of depth 1000 ㎜, adopts C30 expansive concrete 7 to tamp;
6) lay cushion coat: be the extruded polystyrene board 6 of 50 ㎜ at the interior laying depth of pit 2;
7) supplement concreting bed course: pouring concrete bed course 10 after supplementing on extruded polystyrene board 6;
8) reserved waterproofing course and topping construction thereof: mend waterproof roll 12 after laying on rear pouring concrete bed course 10, and overlap 200mm with waterproof roll 11 and tightly paste, concreting topping 5 on waterproof roll 11 and on rear benefit waterproof roll 12;
9) paste intumescent watertight rubber bar: paste intumescent watertight rubber bar 15 at concrete construction joint 3 depth of section middle parts;
10) colligation connects basic raft slab muscle: carry out reinforcing bar 14 overlap joint and connect according to the adjacent joint center 1.35 times of lapped length of steel bar that mutually stagger, and meet the requirement of bar splice area occupation ratio 50%;
11) supplement and water underpin raft plate: adopt than the expansive concrete that waters underpin raft plate 13 high strength grades and supplement rear casting foundation raft plate 4.
Claims (1)
1. a construction method of arranging dewatering well and the flexible sealing of dewatering well in foundation ditch, is characterized in that taking following steps:
1) in foundation ditch, arrange dewatering well (1);
2) dig cushion coat pit: expand to surrounding and within the scope of 500 ㎜～700 ㎜, add deep excavation 50 ㎜～100 ㎜ pits (2) from dewatering well (1) center line;
3) concrete cushion and construction of waterproof layer: concreting bed course (9) is to pit (2) edge, at concrete cushion (9) top laying water-proof coiled material (11) to pit (2) edge;
4) basic raft plate construction: stay and establish concrete construction joint (3) at 2～3 times of width places that extend to basic raft plate (13) lapped length of steel bar to surrounding from dewatering well (1) center line, and the reserved reinforcing bar (14) that meets the overlap joint that mutually staggers;
5) tamp dewatering well: after foundation pit dewatering, in dewatering well (1), adopt medium sand (8) to tamp, in the scope from pit (2) soffit to dewatering well (1) degree of depth 1000 ㎜～2000 ㎜, adopt C30 expansive concrete (7) to tamp;
6) lay cushion coat: laying depth is the extruded polystyrene board (6) of 50 ㎜～100 ㎜ in pit (2);
7) supplement concreting bed course: pouring concrete bed course (10) after extruded polystyrene board (6) upper supplementary;
8) reserved waterproofing course and topping construction thereof: mend waterproof roll (12) after the upper laying of rear pouring concrete bed course (10), and tightly paste the upper and upper concreting topping (5) of rear benefit waterproof roll (12) at waterproof roll (11) with waterproof roll (11) overlap joint 200mm;
9) paste intumescent watertight rubber bar: paste intumescent watertight rubber bar (15) at concrete construction joint (3) depth of section middle part;
10) colligation connects basic raft slab muscle: carry out reinforcing bar (14) overlap joint and connect according to the adjacent joint center 1.35 times of lapped length of steel bar that mutually stagger;
11) supplement and water underpin raft plate: adopt than the expansive concrete that waters the high strength grade of underpin raft plate (13) and supplement rear casting foundation raft plate (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210579869.7A CN103031849B (en) | 2012-12-27 | 2012-12-27 | Method for construction of arranging dewatering well in foundation pit and flexibly closing dewatering well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210579869.7A CN103031849B (en) | 2012-12-27 | 2012-12-27 | Method for construction of arranging dewatering well in foundation pit and flexibly closing dewatering well |
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| Publication Number | Publication Date |
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| CN103031849A CN103031849A (en) | 2013-04-10 |
| CN103031849B true CN103031849B (en) | 2014-11-26 |
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| CN201210579869.7A Expired - Fee Related CN103031849B (en) | 2012-12-27 | 2012-12-27 | Method for construction of arranging dewatering well in foundation pit and flexibly closing dewatering well |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196045B (en) * | 2014-08-28 | 2016-08-17 | 青岛海川建设集团有限公司 | Deep-well precipitation well head well-sealing device and method in underground garage foundation ditch |
| CN110939143A (en) * | 2019-11-29 | 2020-03-31 | 中国建筑第四工程局有限公司 | Simple and easy core section of thick bamboo stepping water conservancy diversion drainage structures |
| CN112575801A (en) * | 2020-12-04 | 2021-03-30 | 中冶天工集团有限公司 | Method for plugging dewatering well |
| CN115324090B (en) * | 2022-10-13 | 2023-03-17 | 山东金城建设有限公司 | Underground engineering pit-in-pit dewatering and well sealing construction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2162122C2 (en) * | 1998-06-17 | 2001-01-20 | Уральская государственная академия путей сообщения | Method for reducing subsoil water level near buildings and structures |
| CN101761096A (en) * | 2009-12-14 | 2010-06-30 | 山东万鑫建设有限公司 | Anti-crack and anti-leak construction method of arranging tower crane foundation below waterproof baseplate |
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2012
- 2012-12-27 CN CN201210579869.7A patent/CN103031849B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2162122C2 (en) * | 1998-06-17 | 2001-01-20 | Уральская государственная академия путей сообщения | Method for reducing subsoil water level near buildings and structures |
| CN101761096A (en) * | 2009-12-14 | 2010-06-30 | 山东万鑫建设有限公司 | Anti-crack and anti-leak construction method of arranging tower crane foundation below waterproof baseplate |
Non-Patent Citations (6)
| Title |
|---|
| 中建一局建设发展公司.金融街B7大厦工程深基坑降水与止水施工总结.《工程质量》.2008,(第4期),第9页右栏第1段及左栏废井封井示意图. * |
| 刘勇等.大孔降水井封井工法.《建筑技术》.2012,第43卷(第12期),第1135页左栏第1段及图1、第1136页第4节及图3. * |
| 北京城建大厦地下室防水施工;李勇;《中国建筑防水》;20040531(第5期);第26页第4.4节及第27页图2 * |
| 大孔降水井封井工法;刘勇等;《建筑技术》;20121215;第43卷(第12期);第1135页左栏第1段及图1、第1136页第4节及图3 * |
| 李勇.北京城建大厦地下室防水施工.《中国建筑防水》.2004,(第5期),第26页第4.4节及第27页图2. * |
| 金融街B7大厦工程深基坑降水与止水施工总结;中建一局建设发展公司;《工程质量》;20080228(第4期);第9页右栏第1段及左栏废井封井示意图 * |
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| CN103031849A (en) | 2013-04-10 |
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Granted publication date: 20141126 |