CN108149691A - Face the method for excavation of deep foundation pit of inner city under complicated geological - Google Patents

Face the method for excavation of deep foundation pit of inner city under complicated geological Download PDF

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Publication number
CN108149691A
CN108149691A CN201711308814.1A CN201711308814A CN108149691A CN 108149691 A CN108149691 A CN 108149691A CN 201711308814 A CN201711308814 A CN 201711308814A CN 108149691 A CN108149691 A CN 108149691A
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CN
China
Prior art keywords
anchor cable
excavation
cast
bored pile
situ bored
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711308814.1A
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Chinese (zh)
Inventor
王琼
金仁兴
王伟
戴培兴
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Shanghai Foundation Engineering Group Co Ltd
Original Assignee
Shanghai Foundation Engineering Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Foundation Engineering Group Co Ltd filed Critical Shanghai Foundation Engineering Group Co Ltd
Priority to CN201711308814.1A priority Critical patent/CN108149691A/en
Publication of CN108149691A publication Critical patent/CN108149691A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The present invention relates to the method for excavation of deep foundation pit for facing inner city under a kind of complicated geological, comprise the concrete steps that:Form is gone along with sb. to guard him to closing on the deep pit construction of inner city using what slope+soil nailing and cast-in-situ bored pile+anchor cable combined.Form is gone along with sb. to guard him using slope+soil nailing in the excavation range of 0~10m, and is aided with plate brad supporting, m esh-hanging sprayed concrete, setting drain hole, gutter;Form is gone along with sb. to guard him using cast-in-situ bored pile+anchor cable in the excavation range of below 10m.According to foundation depth in several vertically arranged anchor cable of cast-in-situ bored pile, no more than 4m, anchor cable is arranged on steel waist rail the spacing of per pass anchor cable, and collective effect is formed with cast-in-situ bored pile.The present invention can improve deep foundation pit construction speed, while ensure the globality of structure, can reduce the construction cost of building enclosure, save the duration;Good effect can be obtained in the Large Underground interchange tunnel construction of city using this method, successful experience can instruct same type engineering construction.

Description

Face the method for excavation of deep foundation pit of inner city under complicated geological
Technical field
The present invention relates to a kind of method of excavation of deep foundation pit, the deep base of inner city is faced under especially a kind of complicated geological Cheat excavation construction method.
Background technology
In short supply with urban development and urban district soil, the town road work of surrounding city is greatly developed in current each city Journey, underground interchange tunnel are widely used.So the building in Lincheng area, traffic route etc. will be inevitable Ground is influenced by engineering construction activity.Because of the stress state that excavation of foundation pit will change surrounding soil, make to close on structure generation Corresponding deformation and internal force influence the normal use in tunnel and the safety of structure.So, how safely and effectively to carry out facing center The deep pit construction in city is particularly exactly a key point under a complicated geological environment.
Invention content
The present invention is to solve the technical issues of the deep pit construction for facing inner city under complicated geological, and provide one Face the method for excavation of deep foundation pit of inner city under kind complicated geological.
To achieve the above object, the technical solution adopted by the present invention is:Face the deep base of inner city under a kind of complicated geological Excavation construction method is cheated, form is gone along with sb. to guard him using what slope, soil nailing, cast-in-situ bored pile, anchor cable combined, comprises the concrete steps that:
(1) according to the geological condition of deep basal pit and surrounding enviroment, design slope, soil nailing, cast-in-situ bored pile, anchor cable combine Building enclosure;
(2) shallow excavation section
The form of going along with sb. to guard him of soil nailing is added using slope in the excavation range of 0~10m, and it is mixed to be aided with plate brad supporting, linked network injection Solidifying soil, setting drain hole, gutter;
(3) deep excavation section
Form is gone along with sb. to guard him using what cast-in-situ bored pile added anchor cable in the excavation range of below 10m, is being drilled according to foundation depth Several vertically arranged anchor cable of bored concrete pile, the spacing of per pass anchor cable is no more than 4m, and anchor cable is arranged on steel waist rail, with cast-in-situ bored pile Collective effect is formed, steel waist rail is welded using 2 32C I-steel.
In above-mentioned steps (2), the supporting parameter of slope:Slope is than 1:0.5, the vertical step that a 1m wide is set per 4m is hung 8@20*20cm of bar-mat reinforcement Φ, spray 10cm thickness C20 concrete, and soil nailing uses steel floral tube Φ 48mm.
In above-mentioned steps (3), cast-in-situ bored pile uses Φ 80cm@100cm, and anchor cable uses 2 Φ 15.2mm prestress steel twists Line.
The present invention useful achievement be:
The present invention can improve deep foundation pit construction speed, while ensure the globality of structure, and can reduce building enclosure Construction cost, save the duration;Construction method using the present invention can be in city Large Underground interchange Tunnel Engineering Good effect is obtained in construction, successful experience can instruct same type engineering construction.
Description of the drawings
Fig. 1 is the pattern foundation pit supporting structure schematic cross-sectional view in the embodiment of the present invention;
Fig. 2 is that the anchor cable in the embodiment of the present invention constructs and anchor cable connect enlarged drawing with drilled pile.
Specific embodiment
With reference to specific example, the embodiment for patent that the present invention is further explained.It should be understood that these examples are only used for Illustrate the range of patent of the present invention rather than limitation patent of the present invention.In addition, it should also be understood that, having read patent teaches of the present invention Content after, those skilled in the art can make various modifications or changes to the present invention, and such equivalent forms equally fall within this Apply for the appended claims limited range.
The present invention is directed to the difficult point for the method for excavation of deep foundation pit for facing inner city under complicated geological, and measure is:
(1) according to the geological condition of construction site and surrounding enviroment, the building enclosure and construction procedure of reasonable design.
(2) the enough construction personnel of tissue and mechanical equipment arrange rational sequence of construction, accelerate speed of application.
(3) every monitoring such as settlement monitoring, horizontal displacement monitoring, observation of groundwater levels, inclination monitoring, stress monitoring is necessary There is scientific and reliability.
Construction, such as Fig. 1 are gone along with sb. to guard him with reference to the big Xi Kou undergrounds interchange engineering of passenger cableways of Yibin City, shown in 2, illustrates the present invention Concrete construction method:
(1) bored pile construction
Since fender post is campshed, " two are jumped and dig one " construction during beginning, placing concrete is underwater C15 concrete.
(2) shallow excavation section:Slope+soil nailing is gone along with sb. to guard him
Earth excavation is symmetrically excavated from center to both sides, and the excavation height of both sides is basically identical.And rationally set drain hole, The measures such as gutter.
Slope is than 1:0.5, the vertical step 2 that a 1m wide is set per 4m, slope surface hangs bar-mat reinforcement 3 as 8@20*20cm of Φ, injection 10cm thickness C20 concrete, soil nailing 4 use 15m steel floral tube Φ 48mm, and level interval and vertical spacing are 1.5m, and every layer sets 3 Casting nail 4, constructs one layer, excavates one layer, until drilling stake top.
When near earth excavation to drilled pile, it is changed to manually cut the earth, in case mechanical excavation destroys drilled pile.
(3) deep excavation section is bored:Hole pouring pile+anchor cable is gone along with sb. to guard him
It is excavated under drilling stake top and starts Guan Liang of constructing at 1.5m;
After Guan Liang concrete reaches design strength 80%, continue to excavate downwards, be carried out at the same time the construction of anchor cable, steel is installed Waist rail, fixed anchor cable and tensioning, then proceed to excavate.Cycle construction in this way, until being excavated to designed elevation.
Several the vertically arranged anchor cable of cast-in-situ bored pile 1, for the spacing of per pass anchor cable no more than 4m, anchor cable is arranged on steel waist rail 5 On, collective effect is formed with cast-in-situ bored pile 1, steel waist rail 5 is welded using 2 32C I-steel.
Cast-in-situ bored pile 1 uses Φ 80cm@100cm, and anchor cable uses 2 Φ 15.2mm prestress wires, anchor cable injection material For material using the neat slurry of the ratio of mud 0.45~0.5, grouting pressure is preferably 0.5~1.5MPa, and secondary grouting pressure is preferably 2.0~ 3.0MPa, anchoring body intensity, which reaches 15MPa, can carry out prestressed stretch-draw, after the completion must sealing off and covering anchorage.

Claims (3)

1. face the method for excavation of deep foundation pit of inner city under a kind of complicated geological, using slope, soil nailing, cast-in-situ bored pile, What anchor cable combined goes along with sb. to guard him form, which is characterized in that comprises the concrete steps that:
(1)According to the geological condition and surrounding enviroment of deep basal pit, what design slope, soil nailing, cast-in-situ bored pile, anchor cable combined goes along with sb. to guard him Structure;
(2)Shallow excavation section
The form of going along with sb. to guard him of soil nailing is added using slope in the excavation range of 0~10m, and be aided with plate brad supporting, m esh-hanging sprayed concrete, Drain hole, gutter are set;
(3)Deep excavation section
Form is gone along with sb. to guard him using what cast-in-situ bored pile added anchor cable in the excavation range of below 10m, according to foundation depth in drill-pouring Several vertically arranged anchor cable of stake, no more than 4m, anchor cable is arranged on steel waist rail, is formed with cast-in-situ bored pile the spacing of per pass anchor cable Collective effect, steel waist rail are welded using 2 32C I-steel.
2. face the method for excavation of deep foundation pit of inner city under complicated geological according to claim 1, it is characterised in that: Above-mentioned steps(2)In, the supporting parameter of slope:Slope is than 1:0.5, the vertical step that a 1m wide is set per 4m hangs bar-mat reinforcement Φ 8@20*20cm, spray 10cm thickness C20 concrete, and soil nailing uses steel floral tube Φ 48mm.
3. face the method for excavation of deep foundation pit of inner city under complicated geological according to claim 1, it is characterised in that: Above-mentioned steps(3)In, cast-in-situ bored pile uses Φ 80cm@100cm, and anchor cable uses 2 Φ 15.2mm prestress wires.
CN201711308814.1A 2017-12-11 2017-12-11 Face the method for excavation of deep foundation pit of inner city under complicated geological Pending CN108149691A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711308814.1A CN108149691A (en) 2017-12-11 2017-12-11 Face the method for excavation of deep foundation pit of inner city under complicated geological

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711308814.1A CN108149691A (en) 2017-12-11 2017-12-11 Face the method for excavation of deep foundation pit of inner city under complicated geological

Publications (1)

Publication Number Publication Date
CN108149691A true CN108149691A (en) 2018-06-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110144909A (en) * 2019-05-21 2019-08-20 无锡市水利设计研究院有限公司 A kind of soil-slope ruggedized construction and method
CN111118967A (en) * 2019-12-30 2020-05-08 中铁第六勘察设计院集团有限公司 Construction method for filling foam light soil foundation pit of railway roadbed in soft soil area

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201137148Y (en) * 2007-12-25 2008-10-22 杭州南方土木工程咨询有限公司 Double rows bamboo pile composite soil nail defending system
CN102518135A (en) * 2011-12-29 2012-06-27 标力建设集团有限公司 Foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles
CN105604065A (en) * 2015-12-08 2016-05-25 西南有色昆明勘测设计(院)股份有限公司 Foundation fit support and peat-soil deep-foundation-pit-support high-pressure jet grouting anchoring method
CN107044128A (en) * 2017-06-13 2017-08-15 河北建太汇行土木工程有限公司 Supporting and dewatering construction method in Deep Excavation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201137148Y (en) * 2007-12-25 2008-10-22 杭州南方土木工程咨询有限公司 Double rows bamboo pile composite soil nail defending system
CN102518135A (en) * 2011-12-29 2012-06-27 标力建设集团有限公司 Foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles
CN105604065A (en) * 2015-12-08 2016-05-25 西南有色昆明勘测设计(院)股份有限公司 Foundation fit support and peat-soil deep-foundation-pit-support high-pressure jet grouting anchoring method
CN107044128A (en) * 2017-06-13 2017-08-15 河北建太汇行土木工程有限公司 Supporting and dewatering construction method in Deep Excavation

Non-Patent Citations (1)

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Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110144909A (en) * 2019-05-21 2019-08-20 无锡市水利设计研究院有限公司 A kind of soil-slope ruggedized construction and method
CN110144909B (en) * 2019-05-21 2020-10-20 无锡市水利设计研究院有限公司 Method for reinforcing soil slope reinforcing structure
CN111118967A (en) * 2019-12-30 2020-05-08 中铁第六勘察设计院集团有限公司 Construction method for filling foam light soil foundation pit of railway roadbed in soft soil area

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Application publication date: 20180612