CN104314082A - Deep function pit supporting structure in karst geology condition and construction method thereof - Google Patents
Deep function pit supporting structure in karst geology condition and construction method thereof Download PDFInfo
- Publication number
- CN104314082A CN104314082A CN201410634154.6A CN201410634154A CN104314082A CN 104314082 A CN104314082 A CN 104314082A CN 201410634154 A CN201410634154 A CN 201410634154A CN 104314082 A CN104314082 A CN 104314082A
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- foundation pit
- supporting structure
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- reinforcing body
- grouting
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a deep foundation pit supporting structure in a karst geology condition and a construction method thereof. The deep foundation pit supporting structure comprises an encircled underground continuous wall (1), and a horizontal grouting reinforcing body (2) which is poured into an encircling area of the underground continuous wall. With the adoption of the deep foundation pit supporting structure, the problem due to serious water leakage occurring in the excavating of the foundation pit under the karst geology condition can be effectively solved; the underground continuous wall has a good effect, and the supporting structure is small in deformation; in addition, the water stopping effect of the sidewall of a foundation pit is obvious, so that the circumstance of water leaking nearly not occurs; the area in the bottom of the foundation pit is subjected to foundation processing by the grouting mode to form a grouting reinforcing body, and thus the channel for water in karst fissures at the bottom of the pit can be effectively cut, and as a result, the problem that water runs from the bottom of the pit can be completely solved; the cement and soluble glass grout is used as the grouting material which can effectively prevent the cement grout from be washed out by the groundwater, and the water blocking and permeating preventing performances of the grouting reinforcing body can be obviously improved.
Description
Technical field
The present invention relates to architecture Foundation Pit Engineering technical field, relate generally to a kind of deep foundation pit supporting structure and construction method thereof.
Background technology
Karst is also known as karst (KARST), that water carries out solublerock (carbonate rock, gypsum, rock salt etc.) based on chemical corrosion, erosion, the mechanisms such as erosion and avalanche of diving of flowing water are auxiliary geologic process, and act on the general name of the phenomenon produced by these.By landforms that karsitification causes, claim karst landform (karst features).Karst features extensively distribute in China, particularly in southwest.Along with the quick propelling of China's urban construction, increasing construction project is faced with Karst Geology.With regard to the base pit engineering under Karst Geology, owing to being rich in crevice water in Karst Geological Landscape, in Excavation Process, foundation pit side-wall and the end, hole, are all faced with serious Karst Fissures water problems, and measures of preventing water is absolutely necessary.According to the Anchored Sheet Pile Wall for Excavation structure of routine, even if add water-stop curtain can not avoid sidewall water leakage situation completely, then can not process completely for hole end water leakage situation.The supporting and protection structure of all the other forms also all faces a similar difficult problem.
Summary of the invention
The object of the invention is to overcome the base pit engineering seepy question under Karst Geology, a kind of deep foundation pit supporting structure that effectively can solve serious seepy question in Excavation Process under Karst Geology is provided.The present invention also provides the construction method of this supporting and protection structure.
Realize the technical scheme that the object of the invention takes as follows:
A deep foundation pit supporting structure under Karst Geology, this deep foundation pit supporting structure by the diaphragm wall enclosed, be cast in the horizontal grouting reinforcing body that diaphragm wall encloses in region and form.
Grouting and reinforcing body of the present invention is positioned at below design elevation at the bottom of Foundation Pit, and thickness is not less than 3.0m.
The construction method of the deep foundation pit supporting structure under Karst Geology of the present invention, first construction of diaphragm wall is carried out, after diaphragm wall encloses structure construction, then at the bottom of Foundation Pit, position slip casting forms horizontal grouting reinforcing body consolidation process ground, finally carries out excavation of foundation pit again.
Grouting and reinforcing body of the present invention selects cement-silicate slurries as injecting paste material, and described cement-silicate slurries mix water glass in cement slurry, and the water/binder ratio of cement slurry is 0.75:1 ~ 1:1, and water glass incorporation is 2% ~ 4% of cement slurry weight.
Beneficial effect of the present invention is:
(1) not only supporting effect is good, Supporting Structure deformation is little for diaphragm wall, and remarkable at the stagnant water effect of foundation pit side-wall, seldom there is water leakage situation.For the base pit engineering under the Karst Geology being rich in Karst-fissure water, diaphragm wall is compared all the other supporting and protection structure and is had certain superiority.
(2) adopt the mode of slip casting to carry out basement process for territory, Foundation Pit base area, form grouting and reinforcing body, effectively can cut off the passage of hole end Karst-fissure water, thoroughly the solution end, hole, emits water problems.
(3) with cement-silicate slurries for injecting paste material, select water glass as injecting paste material fast coagulating early strength agent and injecting paste material impervious agent, the setting time of cement paste can be reduced, prevent cement paste by underground water erosion not easily consolidation, and the water blockoff barrier performance of grouting and reinforcing body can be significantly improved.
Accompanying drawing explanation
Fig. 1 is that the present invention constructs the foundation pit supporting construction generalized section of first stage when namely carrying out construction of diaphragm wall;
Fig. 2 be the present invention construct second stage and grouting and reinforcing body construction time foundation pit supporting construction generalized section;
Fig. 3 be the present invention construct phase III and excavation of foundation pit time foundation pit supporting construction generalized section.
In figure, each label is: 1---diaphragm wall; 2---grouting and reinforcing body; A---earth's surface; B---at the bottom of foundation ditch.
Detailed description of the invention
Below by drawings and Examples, the present invention is described in further detail, but protection scope of the present invention is not limited to described content.
As shown in Figure 1, Figure 2, Figure 3 shows, the deep foundation pit supporting structure under a kind of Karst Geology by the diaphragm wall 1 enclosed, be cast in the horizontal grouting reinforcing body 2 that diaphragm wall encloses in region and form.Grouting and reinforcing body 2 is positioned at below design elevation at the bottom of Foundation Pit, and thickness is not less than 3.0m.
Deep-foundation pit engineering under Karst Geology can adopt diaphragm wall 1+ to cheat the combined support structure of rising pouring slurry reinforcing body 2, first carry out diaphragm wall 1 to construct, after the construction of diaphragm wall 1 space enclosing structure terminates, again at position, the end, design hole grout and strengthen processing ground, finally carry out excavation of foundation pit again.Concrete construction sequence is as follows:
(1) according to Foundation Pit Support Design requirement, the parameters such as the diaphragm wall degree of depth, thickness are determined;
(2) existing construction method is adopted to carry out construction of diaphragm wall;
(3), after diaphragm wall encloses structure construction, according to design mixture proportion configuration injecting paste material---cement-silicate slurries, first prepare cement slurry, then mix water glass.The water/binder ratio of cement slurry is 0.75:1 ~ 1:1, and water glass incorporation is 2% ~ 4% of cement slurry weight;
(4) at the bottom of Foundation Pit, position slip casting forms horizontal grouting reinforcing body, consolidation process ground; The shear strength of grouting and reinforcing body and deadweight should guarantee to resist its buoyancy descending underground water to produce, and both should meet stability requirement;
(5) excavation of foundation pit is carried out.
The Karst-fissure water that diaphragm wall 1 and grouting and reinforcing body 2 effectively can solve foundation pit side-wall and position, the end, hole respectively emits water problems.
Claims (4)
1. the deep foundation pit supporting structure under Karst Geology, is characterized in that, this deep foundation pit supporting structure by the diaphragm wall enclosed (1), be cast in the horizontal grouting reinforcing body (2) that diaphragm wall encloses in region and form.
2. the deep foundation pit supporting structure under Karst Geology according to claim 1, is characterized in that, described grouting and reinforcing body (2) is positioned at below design elevation at the bottom of Foundation Pit, and thickness is not less than 3.0m.
3. the construction method of the deep foundation pit supporting structure under Karst Geology according to claim 1 or 2, it is characterized in that, first diaphragm wall (1) construction is carried out, after diaphragm wall (1) encloses structure construction, at the bottom of Foundation Pit, position slip casting forms horizontal grouting reinforcing body (2) consolidation process ground again, finally carries out excavation of foundation pit again.
4. construction method according to claim 3, it is characterized in that, described grouting and reinforcing body (2) selects cement-silicate slurries as injecting paste material, described cement-silicate slurries mix water glass in cement slurry, the water/binder ratio of cement slurry is 0.75:1 ~ 1:1, and water glass incorporation is 2% ~ 4% of cement slurry weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634154.6A CN104314082A (en) | 2014-11-12 | 2014-11-12 | Deep function pit supporting structure in karst geology condition and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634154.6A CN104314082A (en) | 2014-11-12 | 2014-11-12 | Deep function pit supporting structure in karst geology condition and construction method thereof |
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| CN104314082A true CN104314082A (en) | 2015-01-28 |
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| CN201410634154.6A Pending CN104314082A (en) | 2014-11-12 | 2014-11-12 | Deep function pit supporting structure in karst geology condition and construction method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105862722A (en) * | 2016-04-07 | 2016-08-17 | 中建交通建设集团有限公司 | Three-dimensional treatment method of subway deep foundation pit in karst intense development region |
| CN108824449A (en) * | 2018-07-26 | 2018-11-16 | 中国建筑第八工程局有限公司 | Support system and its construction method with underground horizontal support |
| CN110409457A (en) * | 2019-06-26 | 2019-11-05 | 贵州建工集团第一建筑工程有限责任公司 | Deep foundation pit supporting structure and its construction method under the conditions of a kind of karst area |
| CN110528523A (en) * | 2019-09-02 | 2019-12-03 | 湖南宏禹工程集团有限公司 | A kind of highly permeable stratum building foundation pit horizontal grouting back cover construction method |
| CN111042146A (en) * | 2019-11-11 | 2020-04-21 | 中铁七局集团第二工程有限公司 | Construction method of deep foundation pit supporting anti-seepage system of coastal karst stratum |
| CN111436204A (en) * | 2018-11-12 | 2020-07-21 | 包尔特殊基础工程有限公司 | Method for producing a sealing base in the ground |
| CN111691442A (en) * | 2019-03-15 | 2020-09-22 | 包尔特殊基础工程有限公司 | Foundation pit surrounding structure in foundation and manufacturing method thereof |
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| CN101328713A (en) * | 2008-07-18 | 2008-12-24 | 华丰建设股份有限公司 | Construction method of circular deep foundation pit support |
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| CN204174626U (en) * | 2014-11-12 | 2015-02-25 | 云南建工集团有限公司 | Deep foundation pit supporting structure under a kind of Karst Geology |
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| CN1376836A (en) * | 2001-03-27 | 2002-10-30 | 同济大学 | Method for controlling deformation of foundation pit's retaining wall by grouting in passive area of earth body |
| KR20090007826A (en) * | 2007-07-16 | 2009-01-21 | 김창근 | Process of blocking water penetration and blocking earth collapsing by using impermeable wall without strut |
| CN101328713A (en) * | 2008-07-18 | 2008-12-24 | 华丰建设股份有限公司 | Construction method of circular deep foundation pit support |
| CN101418572A (en) * | 2008-10-17 | 2009-04-29 | 上海隧道工程股份有限公司 | Pit construction method employing precast support |
| KR101109520B1 (en) * | 2010-09-03 | 2012-01-31 | 삼정건설 주식회사 | Method for constructing earth retaining wall using steel pipe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105862722A (en) * | 2016-04-07 | 2016-08-17 | 中建交通建设集团有限公司 | Three-dimensional treatment method of subway deep foundation pit in karst intense development region |
| CN108824449A (en) * | 2018-07-26 | 2018-11-16 | 中国建筑第八工程局有限公司 | Support system and its construction method with underground horizontal support |
| CN111436204A (en) * | 2018-11-12 | 2020-07-21 | 包尔特殊基础工程有限公司 | Method for producing a sealing base in the ground |
| CN111691442A (en) * | 2019-03-15 | 2020-09-22 | 包尔特殊基础工程有限公司 | Foundation pit surrounding structure in foundation and manufacturing method thereof |
| CN110409457A (en) * | 2019-06-26 | 2019-11-05 | 贵州建工集团第一建筑工程有限责任公司 | Deep foundation pit supporting structure and its construction method under the conditions of a kind of karst area |
| CN110528523A (en) * | 2019-09-02 | 2019-12-03 | 湖南宏禹工程集团有限公司 | A kind of highly permeable stratum building foundation pit horizontal grouting back cover construction method |
| CN111042146A (en) * | 2019-11-11 | 2020-04-21 | 中铁七局集团第二工程有限公司 | Construction method of deep foundation pit supporting anti-seepage system of coastal karst stratum |
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| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Jianfei Inventor after: Wang Xiaoyan Inventor after: Wang Xiaofang Inventor after: Yin Huafu Inventor after: Yang Shaozhen Inventor after: Li Zhiping Inventor after: Zhou Chengming Inventor after: Wang Xiaoshu Inventor after: Yang Shixiang Inventor before: Wang Jianfei Inventor before: Zheng Yungang Inventor before: Meng Yinglei Inventor before: Zhou Lin Inventor before: Yang Cheng Inventor before: Su Lanzhong Inventor before: Wang Xiaoyan Inventor before: Yin Huafu Inventor before: Yang Shaozhen Inventor before: Li Zhiping Inventor before: Zhou Chengming Inventor before: Wang Xiaoshu Inventor before: Yang Shixiang Inventor before: Wang Zizhong |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: WANG JIANFEI WANG XIAOYAN YIN HUAFU YANG SHAOZHEN LI ZHIPING ZHOU CHENGMING WANG XIAOSHU YANG SHIXIANG WANG ZIZHONG ZHENG YUNGANG MENG YINGLEI ZHOU LIN YANG CHENG SU LANZHONG TO: WANG JIANFEI WANG XIAOYAN WANG XIAOFANG YIN HUAFU YANG SHAOZHEN LI ZHIPING ZHOU CHENGMING WANG XIAOSHU YANG SHIXIANG |
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Application publication date: 20150128 |