CN105421463B - Longitudinal excavation construction method of long-span dense-support super-long deep foundation pit - Google Patents
Longitudinal excavation construction method of long-span dense-support super-long deep foundation pit Download PDFInfo
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- CN105421463B CN105421463B CN201510747234.7A CN201510747234A CN105421463B CN 105421463 B CN105421463 B CN 105421463B CN 201510747234 A CN201510747234 A CN 201510747234A CN 105421463 B CN105421463 B CN 105421463B
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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
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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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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a longitudinal excavation construction method of a long-span dense-support super-long deep foundation pit. The longitudinal excavation construction method is characterized in that after first-layer earth is excavated above bottom elevations of top beams of a foundation pit and bottom elevations of inner supports, transverse access roads connecting access roads on the two outer sides of the foundation pit are formed within the range of the foundation pit before second-layer earth is excavated in the foundation pit; excavators longitudinally excavate grooves from the two sides of the transverse access roads to form earth channels; passive-pressure earth is reserved on the two sides, close to an enclosure structure, of the foundation pit, so as to maintain the stability of the foundation pit; after the earth channels are excavated to the other end of the foundation pit along the longitudinal excavated grooves of the foundation pit, the excavators back up to excavate the second-layer earth and third-layer earth, steel supports are erected, and the second-layer earth and the third-layer earth are sequentially excavated within 50m of the two sides of the transverse access roads, wherein the back excavation distance is a spacing between two adjacent steel supports; in an earth excavation process, earth transport vehicles transport the earth out of the foundation pit from excavated earth discharge channels and transverse ramps; concrete supports within 50m of the two sides of the transverse access roads are constructed by a support method; and the earth of the transverse access roads and the earth within 50m of the two sides of the transverse access roads are excavated transversely, and the steel supports are erected. The longitudinal excavation construction method has the benefits that the construction speed is high, the efficiency is high, the construction period and the engineering cost are saved.
Description
Technical field
The present invention relates to a kind of large span is close to support overlength deep basal pit longitudinal direction excavation construction method.
Background technology
In deep foundation pit construction operation process, earth excavation construction is often construction key content, affects integral construction to enter
Degree.Different earthwork digging methods, conventional pattern foundation pit supporting structure form is adopted to have according to different support forms：Support pile+interior
Support, support pile+prestress anchorage cable, diaphram wall etc..Earth excavation long construction period, difficulty of construction are big, in work progress
How earth excavation construction always construction emphasis and a difficult problem are efficiently and safely carried out.
Pit earthwork is longitudinally excavated with its efficient digging mode, tight in the duration, the good foundation ditch of construction line length, soil property
Using good in earth excavation.With reference to pattern foundation pit supporting structure form and soil condition, duration, safety are considered, outside earth excavation
Fortune external condition etc., my portion define Deep Foundation Pit Excavation longitudinal direction excavation construction engineering method.
The content of the invention
It is an object of the invention to provide a kind of large span is close to support overlength deep basal pit longitudinal direction excavation construction method, the side of the present invention
Method has：1st, speed of application is fast, and effect is high, saves duration and engineering cost.2nd, compare laterally excavation, longitudinal excavation pit side without
Mechanical load and mound load, beneficial to deep pit monitor.3rd, laterally excavation is compared, longitudinal excavation mechinery input amount is little.4th, construction machine
Tool opereating specification is big, it is to avoid laterally excavate because supporting restriction freely cannot stretch, and in work progress the earthwork repeatedly must have bad luck and
Excavation mechinery is frequently moved.
The technical scheme is that：
Large span is close to support overlength deep basal pit longitudinal direction excavation construction method, it is characterised in that carry out according to the following steps：(1)
Ground floor earth excavation is carried out in the range of foundation ditch both sides support pile and Guan Liang, ground floor earth excavation is to first concrete
Guan Liang and concrete Construction of Supporting are carried out after supportting bottom elevation of coming of age；(2) first set in the range of foundation ditch before excavating second layer earthwork passage
The horizontal sidewalk of connection foundation ditch both sides sidewalk is put, and a horizontal sidewalk, and each horizontal sidewalk two is designed every 200-250m
The pre- joint constructions of side 1m, in the range of each horizontal sidewalk and each 50m in both sides, concrete is supported and is not temporarily constructed, and is preced with each horizontal sidewalk
Beam construction completes to use clay backfilling；(3) during second layer earth excavation, big digging machine is excavated from each horizontal sidewalk both sides longitudinal direction kerve
Unearthed passage, foundation ditch both sides are supported near the reserved back-pressure soil of building enclosure, interim replacement, it is ensured that foundation ditch is stable；Along foundation ditch longitudinal direction
Kerve is excavated and is unearthed passage to the other end, is arranged the wide platforms of 12-18m in foundation ditch another side and is moved back digging second using digging machine
With three layers of earthwork, often hollowing out foundation ditch bottom one segment distance of mark just carries out bracing members erection in time, moves back digging distance between adjacent bracing members
Away from 50m scopes each to both sides at horizontal sidewalk of constructing successively；(4), during earth excavation, earthwork transportation car is from going out for excavating
The earthwork is transported foundation ditch by native passage and horizontal sidewalk, then carries out each 50m scopes in horizontal sidewalk both sides using step Support Method
First concrete is supported and is set up, and finally employing laterally goes out local method and each 50m scopes earthwork of horizontal sidewalk and both sides is excavated, and and
When set up bracing members.
The width of described horizontal sidewalk is 12-18m.
The each 50m in the horizontal sidewalk both sides of each described is set to 1：10 slope ratios, it is ensured that away from horizontal sidewalk edge it is nearest one
Road concrete supports headroom 4m away from ramp.
To ensure stablizing for support pile and foundation ditch, both sides support pile side:The earthwork of 4m wide scopes must not be excavated, 4m scopes with
It is outer to build 1:2-1：2.5 slope ratio.
The third layer earthwork is often excavated out 3.5-4.0m length and just installs a bracing members.
Present invention additionally comprises following steps:Suspended net shotcrete bank protection is adopted to slope surface after each section of earth excavation.
Described step (four) concrete grammar is：For the second layer earthwork at each 50m scopes ramp in horizontal sidewalk both sides
After the completion of excavation, support must be set up come concrete support of constructing, first built laterally according to concrete Support Position on ramp before setting up support
Then step, every grade of step width 5m set up concrete support on step.
The method of the present invention has：1st, speed of application is fast, and effect is high, saves duration and engineering cost.
2nd, laterally excavation, longitudinal excavation pit side mechanical load and mound load are compared, beneficial to deep pit monitor.
3rd, laterally excavation is compared, longitudinal excavation mechinery input amount is little.
4th, construction machinery opereating specification is big, it is to avoid laterally excavate because supporting restriction freely cannot stretch, and in work progress
The earthwork repeatedly must be had bad luck and excavation mechinery is frequently moved.
Description of the drawings
Horizontal sidewalk construction schematic diagrams of the Fig. 1 for the embodiment of the present invention.
Fig. 2 excavates second and third layer of earthwork schematic diagram for the rollback of the embodiment of the present invention.
Suspended net shotcrete bank protection schematic diagrams of the Fig. 3 for the embodiment of the present invention.
Fig. 4 is concrete Construction of Supporting schematic diagram at the horizontal sidewalk of the embodiment of the present invention.
Fig. 5 is the process chart of the present invention.
Specific embodiment
The invention will be further described in conjunction with the accompanying drawings and embodiments.
Large span of the present invention is close to support overlength deep basal pit longitudinal direction excavation construction method, as shown in figure 1, specifically according to the following steps
Carry out：
First, ground floor earth excavation, the construction of Guan Liang inner support
Ground floor earth excavation to first concrete support to be come of age and carry out Guan Liang and concrete Construction of Supporting after bottom elevation, and
2nd, in the range of the horizontal sidewalk of three layers of earth excavation and each 50m in both sides, concrete is supported and is not temporarily constructed, and both sides Guan Liang first must be constructed, and apply
During work Guan Liang, concrete supports both sides respectively to construct 1m length simultaneously as later stage concrete Construction of Supporting joint, and Guan Liang construction at horizontal sidewalk is completed
With clay backfilling protecting.
The 2nd, horizontal sidewalk is set, longitudinal gradient is excavated
(1) horizontal sidewalk
The horizontal sidewalk of the outer both sides sidewalk of connection foundation ditch is first set in the range of foundation ditch before excavating, and horizontal sidewalk width 15m is horizontal
Support to sidewalk both sides concrete and wouldn't construct, as shown in Figure 1.
(2) excavate longitudinal gradient
Using 1m3Big digging machine excavates ramp of being unearthed from slope slotting in the middle of horizontal sidewalk, and slope ratio is 1:10, it is ensured that away from horizontal
One nearest concrete of sidewalk edge supports headroom 4m away from ramp；To ensure stablizing for support pile and foundation ditch, both sides support pile side
The earthwork of 4m wide scopes must not be excavated, and build 1 beyond 4m scopes:2 slope (soil property preferable where suitably put steep gradient), utilizes
Reserved back-pressure soil is interim to replace first reinforced concrete to support.
3rd, fluting excavates the second layer earthwork
For the other end for excavating each work surface as early as possible, the first only excavation 12m wide groove of the second layer earthwork, the position root of groove
According to longitudinal ramp position, the earthwork of groove both sides presses 1:2 gradient slopes.
4th, retreat and excavate second and third layer of earthwork
Fluting excavates the second layer earthwork to after the other end of each work surface, and the earthwork of both sides is first excavated with big digging machine, digs
Go out a wide platform of 15m, then big digging machine is reached on platform while excavation second layer surplus earth and the third layer earthwork, soil
The earthwork is transported foundation ditch from the groove opened by square transport vehicle, and earthwork head fall is 1:2 (soil property it is preferable where suitably put abrupt slope
Degree).The spacing for digging 1 bracing members is moved back every time, and 1 bracing members is installed in follow-up immediately, as shown in Figure 2.
5th, bracing members are installed
The long just timely installation bracing members of 3.5m (spacing of second layer bracing members), earth excavation are often excavated out in the third layer earthwork
It is complete to install time interval less than 8 hours to bracing members.
6th, spraying anchor between piles
Guarantee Stability of Earth Slopes, suspended net shotcrete bank protection (linked network), suspended net shotcrete are adopted to slope surface after each section of earth excavation
Protective slope structure, as shown in Figure 3.
In-network processing construction technology between stake：Earth excavation → scaffolding → manual amendment wall → fixing muscle construction
(steel planting) → linked network muscle → welding → injection fine-stone concrete.
7th, concrete Construction of Supporting at horizontal sidewalk
After the completion of for the second layer earth excavation at ramp, support must be set up come concrete support of constructing, set up elder generation before support
Lateral step is built according to concrete Support Position on ramp, then every grade of step width 5m sets up concrete support, such as Fig. 4 on step
It is shown.Finally employing laterally goes out local method and each 50m scopes earthwork of horizontal sidewalk and both sides is excavated, and sets up steel in time
Support.
8th, second and third layer of earth excavation at horizontal sidewalk and ramp
At horizontal sidewalk and ramp, second and third layer of earthwork must adopt big digging machine and long-armed digging machine to coordinate carry out drawing digging or grab
Bucket is laterally unearthed.
Claims (6)
1. large span is close supports overlength deep basal pit longitudinal direction excavation construction method, it is characterised in that carry out according to the following steps：（One）
Ground floor earth excavation is carried out in the range of foundation ditch both sides support pile and Guan Liang, ground floor earth excavation is to first concrete support
Come of age Guan Liang and concrete Construction of Supporting are carried out after bottom elevation；（Two）First arrange in the range of foundation ditch before excavating second layer earthwork passage
The horizontal sidewalk of connection foundation ditch both sides sidewalk, and a horizontal sidewalk, and each horizontal sidewalk both sides are designed every 200-250m
The pre- joint constructions of 1m, in the range of each horizontal sidewalk and each 50m in both sides, concrete is supported and is not temporarily constructed, Guan Liang at each horizontal sidewalk
Construction completes to use clay backfilling；（Three）During second layer earth excavation, big digging machine is excavated out from each horizontal sidewalk both sides longitudinal direction kerve
Native passage, foundation ditch both sides are supported near the reserved back-pressure soil of building enclosure, interim replacement, it is ensured that foundation ditch is stable；Longitudinally draw along foundation ditch
Groove is excavated and is unearthed passage to the other end, is arranged the wide platforms of 12-18m in foundation ditch another side and is moved back the second He of digging using digging machine
Three layers of earthwork, often hollow out foundation ditch bottom and mark a segment distance just timely erection bracing members, and it is adjacent steel support interval to move back digging distance, successively
Construct 50m scopes each to both sides at horizontal sidewalk；（Four）During earth excavation, earthwork transportation car from excavate unearthed passage and
Laterally the earthwork is transported foundation ditch by sidewalk, and first concrete of each 50m scopes in horizontal sidewalk both sides is then carried out using step Support Method
Support and set up, finally employing laterally goes out local method and each 50m scopes earthwork of horizontal sidewalk and both sides is excavated, and sets up steel
Support, the step Support Method must not be excavated for the earthwork of both sides support pile side 4m wide scopes, build 1 beyond 4m scopes:2-4's
Slope ratio.
2. large span according to claim 1 is close supports overlength deep basal pit longitudinal direction excavation construction method, it is characterised in that：Institute
The width of the horizontal sidewalk stated is 12-18m.
3. large span according to claim 1 is close supports overlength deep basal pit longitudinal direction excavation construction method, it is characterised in that：Institute
The each 50m in each horizontal sidewalk both sides for stating is set to 1：10 slope ratios, it is ensured that away from one nearest concrete of horizontal sidewalk edge support away from
Headroom 4m in ramp.
4. large span according to claim 1 is close supports overlength deep basal pit longitudinal direction excavation construction method, it is characterised in that：Institute
State step（Three）The third layer earthwork often excavate out 2.5-3.5m length a piece bracing members be just installed.
5. large span according to claim 3 is close supports overlength deep basal pit longitudinal direction excavation construction method, it is characterised in that：Also
Comprise the following steps:Suspended net shotcrete bank protection is adopted to slope surface after each section of earth excavation.
6. large span according to claim 1 is close supports overlength deep basal pit longitudinal direction excavation construction method, it is characterised in that：Institute
The step of stating（Four）Concrete grammar is：After the completion of for the second layer earth excavation at each 50m scopes ramp in horizontal sidewalk both sides,
Support must be set up come concrete support of constructing, before setting up support, lateral step, per grade of platform are built according to concrete Support Position on ramp first
Rank width 5m, then sets up concrete support on step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510747234.7A CN105421463B (en) | 2015-11-04 | 2015-11-04 | Longitudinal excavation construction method of long-span dense-support super-long deep foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510747234.7A CN105421463B (en) | 2015-11-04 | 2015-11-04 | Longitudinal excavation construction method of long-span dense-support super-long deep foundation pit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105421463A CN105421463A (en) | 2016-03-23 |
| CN105421463B true CN105421463B (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510747234.7A Expired - Fee Related CN105421463B (en) | 2015-11-04 | 2015-11-04 | Longitudinal excavation construction method of long-span dense-support super-long deep foundation pit |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887889B (en) * | 2016-04-20 | 2018-04-24 | 中铁上海工程局集团有限公司 | A kind of ultra-wide hyposmosis mud method of excavation of deep foundation pit |
| CN107023012B (en) * | 2017-03-28 | 2019-06-21 | 深圳市工勘岩土集团有限公司 | Multiple tracks annular concrete supports Deep Foundation Pit Excavation to transport outward construction method |
| CN109677864A (en) * | 2019-02-27 | 2019-04-26 | 中铁十二局集团有限公司 | A kind of portable belt conveyer and " it " font earthwork digging method |
| CN110670597A (en) * | 2019-10-08 | 2020-01-10 | 中铁开发投资集团有限公司 | Reasonable excavation method for deep and large foundation pit under water-rich round gravel condition |
| CN111042145B (en) * | 2020-01-02 | 2022-03-11 | 中国水利水电第八工程局有限公司 | Construction method for excavating foundation pit near deep-buried large-diameter pipeline |
| CN115262567A (en) * | 2022-08-02 | 2022-11-01 | 中建市政工程有限公司 | Ultra-narrow full-hard rock deep foundation pit excavation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691300A (en) * | 2012-04-18 | 2012-09-26 | 浙江省建工集团有限责任公司 | Construction method of foundation pit earthwork |
| CN203625911U (en) * | 2013-12-24 | 2014-06-04 | 中国建筑第四工程局有限公司 | Soil discharging construction structure with pit-in-pit door opening arranged in deep foundation pit |
| CN104404964A (en) * | 2014-10-15 | 2015-03-11 | 中建四局第六建筑工程有限公司 | Four-synchronous-operation excavation and support construction method for deep and large foundation pit containing thick mud layer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7883296B2 (en) * | 2008-08-28 | 2011-02-08 | Meyer John W | Shoring beam extension and reinforcement assembly |
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2015
- 2015-11-04 CN CN201510747234.7A patent/CN105421463B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691300A (en) * | 2012-04-18 | 2012-09-26 | 浙江省建工集团有限责任公司 | Construction method of foundation pit earthwork |
| CN203625911U (en) * | 2013-12-24 | 2014-06-04 | 中国建筑第四工程局有限公司 | Soil discharging construction structure with pit-in-pit door opening arranged in deep foundation pit |
| CN104404964A (en) * | 2014-10-15 | 2015-03-11 | 中建四局第六建筑工程有限公司 | Four-synchronous-operation excavation and support construction method for deep and large foundation pit containing thick mud layer |
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| CN105421463A (en) | 2016-03-23 |
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