CN109469068A - A kind of rich water soft stratum excavation of foundation pit and Support Method - Google Patents
A kind of rich water soft stratum excavation of foundation pit and Support Method Download PDFInfo
- Publication number
- CN109469068A CN109469068A CN201811300191.8A CN201811300191A CN109469068A CN 109469068 A CN109469068 A CN 109469068A CN 201811300191 A CN201811300191 A CN 201811300191A CN 109469068 A CN109469068 A CN 109469068A
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- excavation
- foundation pit
- soil
- steel
- pit
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a kind of rich water soft stratum excavation of foundation pit and Support Methods, comprising: step 1) applies high-pressure rotary jet grouting pile or deep cement-mixed pile；Step 2 excavates bonding layer foundation pit；Step 3) carries out advanced deep hole curtain-grouting；Step 4) preliminary bracing, loopful are applied in the upright excavation face of foundation pit, and preliminary bracing includes being laid with steel mesh and gunite concrete；Step 5) welds together the exposed tube head of Grouting Pipe with steel mesh, forms combined supporting；Remaining core soil in advance in rapid 6) excavation pit；Support system is arranged in step 7)；Step 8) is monitored building enclosure stress, deformation, and monitoring measurement result is normal, then carries out excavation and the supporting operation of subsequent cycle, repeats step 2-step 7).The present invention can make the deep big foundation pit excavation under the conditions of rich water soft stratum achieve the effect that good Deformation control and water seepage prevention, and base pit stability is good, and environment influence is small, and construction risk is small, and comprehensive benefit is high.
Description
Technical field
The present invention relates to Pit under Complicated Geological Conditions excavation and support method more particularly to a kind of rich water soft stratum bases
Hole excavate and with infiltration control method.
Background technique
With level of urbanization fast development, city can utilize land resource growing tension, rational exploitation and utilization city
Down space resource has become inexorable trend.And base pit engineering is often the engineerings such as large-scale construction engineering, railway traffic engineering, municipal administration
Important feature form.Base pit engineering is related to engineering geology, infiltration mechanics, construction technology and monitoring technology etc., comprehensive strong；And
The features such as stronger tau-effect of base pit engineering, environmental effect, region, construction risk is very big.Especially rich water soft stratum
Condition brings extreme difficulty to underground engineering construction, so base pit engineering is often the main projects of entire construction project.
Urban groundwater is abundant, and mostly soft stratum, excavates in this stratum, and not controlling often such as will appear hole
Phenomena such as wall large deformation, bottom heave, water burst, causes Important Project accident.Deep big foundation pit in city underground engineering is often tight
Adjacent various important buildings, narrow space, it is clear that excavated without condition slope.Tunneling boring vertical cut is such as carried out, due to stress
The factors such as release and soft soil creep, foundation pit deformation is big, and stability is poor.Traditional method for protecting support have soil nail wall, campshed bored concrete pile,
Lower diaphragm wall etc., these method for protecting support do not carry out pre-reinforcement to the foundation pit surrounding soil body, mostly use bored concrete pile or interlocking pile,
This inevitably will cause some adjacent studs lower parts and is not engaged strictly and leads to leak, and support rigidity deficiency also can inevitably generate compared with
Large deformation jeopardizes the safety of base pit engineering and neighboring buildings.It is especially complex to some geological conditions such as rich water soft stratum, adopt
It is preferable with diaphram wall support rigidity, but construction of diaphragm wall difficulty is big, even with trough plate type diaphram wall, such as
Construction method is improper also cannot to be inevitably aligned in the appearance of adjacent wall section and lead to leak, and this method is costly.
Summary of the invention
The purpose of the present invention is to propose to a kind of rich water soft stratum base pit engineering excavation and Support Methods, can effectively control
Foundation pit deformation and underground water leakage processed guarantees that rich water soft stratum base pit engineering safety, quick, low cost are excavated.
For achieving the above object, the technical scheme is that a kind of rich water soft stratum excavation of foundation pit with combine
Method for protecting support, comprising the following steps:
Step 1) vertically applies high-pressure rotary jet grouting pile or deep cement-mixed pile in Rock And Soil on the outside of the excavation of foundation pit line, reaches design
Depth, formation bonding layer is gone along with sb. to guard him and water-stop curtain；
Step 2 excavates bonding layer foundation pit using provided core soil method, forms the small foundation pit in two sides；
Step 3) is drilled on the outside of the water-stop curtain obliquely using excavation pit space in Rock And Soil, and Grouting Pipe is put into drilling
It is interior, advanced deep hole curtain-grouting is carried out, is formed and reinforces Rock And Soil；
Step 4) preliminary bracing, loopful are applied in the upright excavation face of foundation pit, form closed flexible support layer, preliminary bracing packet
It includes and is laid with steel mesh and gunite concrete；
Step 5) welds together the exposed tube head of Grouting Pipe with steel mesh, forms combined supporting；
Remaining core soil in advance in step 6) excavation pit；
Support system is arranged in step 7), sets including the circumferential steel purlin being arranged on relative closure Rock And Soil outer wall and interval
The steel being placed in circumferential steel purlin is to the steel diagonal brace for supportting and being fixedly installed on closing two adjoining outer walls of Rock And Soil；
Step 8) to building enclosure stress, deformation be monitored, monitoring measurement result is normal, then carry out subsequent cycle excavation and
Supporting operation repeats step 2-step 7).
Further, in the step 7), circumferential steel purlin, steel use fashioned iron to the steelframe of support and steel diagonal brace
Steelframe.
The beneficial effects of the present invention are:
(1) sealing and deformation control effect are good.Vertical high-pressure rotary jet grouting pile or deep cement-mixed pile are applied in advance, in rich water weakness
It can effectively be prevented on the outside of foundation pit in Groundwater infiltration foundation pit under formation condition, water-stagnating effect is good.Pass through bonding layer water-stop curtain, deep hole
The combined supporting that curtain-grouting, preliminary bracing and support system are formed, significantly improves the overall stiffness of building enclosure, can effectively control
Soft soil foundation pit deformation processed, and foundation pit water-stagnating effect can be obviously improved.
(2) overall stiffness is big, stability is good.Advance support is applied, advance support and preliminary bracing form whole stress knot
Structure；Preliminary bracing flexible can not only play preferable Stress relief and excessive deformation occurs for control Rock And Soil, but also can achieve
The purpose of effective water seepage prevention, guarantees integral stability of foundation pit.
(3) strong applicability.This method is adaptable to various complicated geologicals and hydrogeology, and control deformation effect is good, prevents
Infiltration water-stagnating effect is good, and base pit stability is good, and effect on environment is small, and construction risk is small, has very strong applicability.
(4) comprehensive benefit is high.The deep big foundation pit of proposition is layered provided core soil method excavation and combined supporting side from top to bottom
Method, the section excavation that becomes larger are light section excavation, increase base pit stability, reduce construction risk；Support Method is alternatively
Lower diaphragm wall, work efficiency height, reliable in quality, environment influence small, good economy performance, and comprehensive benefit is high.
Detailed description of the invention
Fig. 1 is rich water soft stratum base pit engineering combined retaining structure floor map；
Fig. 2 is the sectional schematic diagram of rich water soft stratum base pit engineering combined retaining structure；
Fig. 3 is the partial enlargement diagram of A in Fig. 2；
Fig. 4 is that rich water soft stratum excavation of foundation pit and Support Method apply bonding layer water-stop curtain schematic diagram；
Fig. 5 is rich water soft stratum excavation of foundation pit and Support Method excavation pit first floor schematic diagram；
Fig. 6 is that rich water soft stratum excavation of foundation pit and Support Method apply advanced deep hole curtain-grouting schematic diagram；
Fig. 7 is that rich water soft stratum excavation of foundation pit and Support Method apply the signal of excavation pit vertical surface preliminary bracing
Figure；
Fig. 8 is that rich water soft stratum excavation of foundation pit and Support Method excavate foundation pit core soil body schematic diagram；
Fig. 9 is rich water soft stratum excavation of foundation pit and Support Method setting support system schematic diagram；
Component and corresponding label in attached drawing: high-pressure rotary jet grouting pile or deep cement-mixed pile 1, advanced deep hole curtain-grouting 2, just
Phase supporting 3, gunite concrete 4, steel mesh 5, circumferential steel purlin 6, steel are to support 7, remaining core soil in advance 8, small foundation pit 9, steel
Diagonal brace 10.
Specific embodiment
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
As shown in Figs. 1-2, a kind of rich water soft stratum base pit engineering combined retaining structure, including high-pressure rotary jet grouting pile or deep layer
Cement mixing pile 1, advanced deep hole curtain-grouting 2, preliminary bracing 3 and support system, support system include circumferential steel purlin 6,
Steel is to support 7, steel diagonal brace 10.
Excavation of foundation pit and Support Method, comprising the following steps:
As shown in figure 4, step 1) vertically applies high-pressure rotary jet grouting pile or deep-cement stirring on the outside of the excavation of foundation pit line in Rock And Soil
Stake 1 reaches projected depth, and formation bonding layer is gone along with sb. to guard him and water-stop curtain；
As shown in figure 5, step 2 excavates bonding layer foundation pit using provided core soil method, the small foundation pit 9 in two sides is formed；
As shown in fig. 6, step 3) is drilled on the outside of the water-stop curtain obliquely using excavation pit space in Rock And Soil, by slip casting
Pipe is put into drilling, carries out advanced deep hole curtain-grouting 2, is formed and is reinforced Rock And Soil；
As shown in fig. 7, step 4) preliminary bracing 3, loopful is applied in the upright excavation face of foundation pit, forms closed flexible support
Layer, preliminary bracing include being laid with steel mesh 5 and gunite concrete 4；
Step 5) welds together the exposed tube head of Grouting Pipe with steel mesh 5, forms combined supporting；
As shown in figure 8, remaining core soil in advance 8 in step 6) excavation pit；
As shown in figure 9, support system is arranged in step 7), including the circumferential steel purlin being arranged on relative closure Rock And Soil outer wall
6, and the steel that is arranged at intervals in circumferential steel purlin 6 to support 7 and is fixedly installed on closing two adjoining outer walls of Rock And Soil
Steel diagonal brace 10；Circumferential steel purlin 6, steel use profile steel frame to the steelframe of support 7 and steel diagonal brace 10；
Step 8) to building enclosure stress, deformation be monitored, monitoring measurement result is normal, then carry out subsequent cycle excavation and
Supporting operation repeats step 2-step 7).
Rich water soft stratum excavation of foundation pit of the present invention and Support Method, by water-stop curtain, deep hole curtain-grouting, just
The combined supporting that phase supporting and support system are formed, alternatively descends diaphragm wall, avoids because construction method is improper in adjacent wall section
Seepy question caused by appearance cannot be aligned, can be obviously improved foundation pit water-stagnating effect, effectively control soft soil foundation pit deformation, have
Work efficiency height, reliable in quality, environment influence the high feature of small, good economy performance, comprehensive benefit.
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to the scope of the present invention.
Claims (2)
1. a kind of rich water soft stratum excavation of foundation pit and Support Method, which comprises the following steps:
Step 1) vertically applies high-pressure rotary jet grouting pile or deep cement-mixed pile in Rock And Soil on the outside of the excavation of foundation pit line, reaches design
Depth, formation bonding layer is gone along with sb. to guard him and water-stop curtain；
Step 2 excavates bonding layer foundation pit using provided core soil method, forms the small foundation pit in two sides；
Step 3) is drilled on the outside of the water-stop curtain obliquely using excavation pit space in Rock And Soil, and Grouting Pipe is put into drilling
It is interior, advanced deep hole curtain-grouting is carried out, is formed and reinforces Rock And Soil；
Step 4) preliminary bracing, loopful are applied in the upright excavation face of foundation pit, form closed flexible support layer, preliminary bracing packet
It includes and is laid with steel mesh and gunite concrete；
Step 5) welds together the exposed tube head of Grouting Pipe with steel mesh, forms combined supporting；
Remaining core soil in advance in step 6) excavation pit；
Support system is arranged in step 7), sets including the circumferential steel purlin being arranged on relative closure Rock And Soil outer wall and interval
The steel being placed in circumferential steel purlin is to the steel diagonal brace for supportting and being fixedly installed on closing two adjoining outer walls of Rock And Soil；
Step 8) to building enclosure stress, deformation be monitored, monitoring measurement result is normal, then carry out subsequent cycle excavation and
Supporting operation repeats step 2-step 7).
2. a kind of rich water soft stratum excavation of foundation pit as described in claim 1 and Support Method, which is characterized in that described
In step 7), circumferential steel purlin, steel use profile steel frame to the steelframe of support and steel diagonal brace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811300191.8A CN109469068A (en) | 2018-11-02 | 2018-11-02 | A kind of rich water soft stratum excavation of foundation pit and Support Method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811300191.8A CN109469068A (en) | 2018-11-02 | 2018-11-02 | A kind of rich water soft stratum excavation of foundation pit and Support Method |
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| Publication Number | Publication Date |
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| CN109469068A true CN109469068A (en) | 2019-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811300191.8A Pending CN109469068A (en) | 2018-11-02 | 2018-11-02 | A kind of rich water soft stratum excavation of foundation pit and Support Method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185044A (en) * | 2019-06-17 | 2019-08-30 | 中铁上海设计院集团有限公司 | A kind of foundation pit side-wall Stress relief system for deep caving ground |
| CN110258606A (en) * | 2019-06-26 | 2019-09-20 | 中国电建集团成都勘测设计研究院有限公司 | Projecting wall encloses well construction |
| US20240076848A1 (en) * | 2022-09-06 | 2024-03-07 | Fucai HUA | Method for constructing large-span station with two-wing open type half-cover excavation and half-reverse construction |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147444A (en) * | 2013-03-24 | 2013-06-12 | 中铁二院工程集团有限责任公司 | Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method |
| CN105178326A (en) * | 2015-06-03 | 2015-12-23 | 福建工程学院 | Water stop method for upper-soft and lower-hard water-rich stratum foundation pit engineering retaining structure |
-
2018
- 2018-11-02 CN CN201811300191.8A patent/CN109469068A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147444A (en) * | 2013-03-24 | 2013-06-12 | 中铁二院工程集团有限责任公司 | Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method |
| CN105178326A (en) * | 2015-06-03 | 2015-12-23 | 福建工程学院 | Water stop method for upper-soft and lower-hard water-rich stratum foundation pit engineering retaining structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185044A (en) * | 2019-06-17 | 2019-08-30 | 中铁上海设计院集团有限公司 | A kind of foundation pit side-wall Stress relief system for deep caving ground |
| CN110185044B (en) * | 2019-06-17 | 2023-12-12 | 中铁上海设计院集团有限公司 | Foundation pit side wall stress adjustment system for deep unstable stratum |
| CN110258606A (en) * | 2019-06-26 | 2019-09-20 | 中国电建集团成都勘测设计研究院有限公司 | Projecting wall encloses well construction |
| US20240076848A1 (en) * | 2022-09-06 | 2024-03-07 | Fucai HUA | Method for constructing large-span station with two-wing open type half-cover excavation and half-reverse construction |
| US11959243B2 (en) * | 2022-09-06 | 2024-04-16 | Beijing Urban Construction Design & Development Group Co., Limited | Method for constructing large-span station with two-wing open type half-cover excavation and half-reverse construction |
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Application publication date: 20190315 |