CN110485433A - Sand gravel geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support - Google Patents

Sand gravel geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support Download PDF

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Publication number
CN110485433A
CN110485433A CN201910821716.0A CN201910821716A CN110485433A CN 110485433 A CN110485433 A CN 110485433A CN 201910821716 A CN201910821716 A CN 201910821716A CN 110485433 A CN110485433 A CN 110485433A
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CN
China
Prior art keywords
fender post
foundation pit
concrete
design
steel
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
CN201910821716.0A
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Chinese (zh)
Inventor
陈朝勃
柳仓太
张小强
杨洋
康旭升
马增福
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fourth Engineering Co Ltd of China Railway 21st Bureau Group Co Ltd
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Fourth Engineering Co Ltd of China Railway 21st Bureau 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.)
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Publication date
Application filed by Fourth Engineering Co Ltd of China Railway 21st Bureau Group Co Ltd filed Critical Fourth Engineering Co Ltd of China Railway 21st Bureau Group Co Ltd
Priority to CN201910821716.0A priority Critical patent/CN110485433A/en
Publication of CN110485433A publication Critical patent/CN110485433A/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
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18Restraining 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
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering

Abstract

Sand gravel geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support of the present invention.It is to construct according to insertion depth, diameter, the spacing etc. of fender post to concrete fender post;Concrete continuous wall is formed between concrete fender post, forms whole building enclosure with fender post;Hanging plate is hung up at the crown beam for going along with sb. to guard him stake top, and anchor cable is added at the design position of foundation pit and fixes, forms prestress anchorage cable;Tripod is anchored into fender post, the monitoring of supporting construction sidesway is carried out.The present invention makes to improve the effect that construction method reaches other method for protecting support under the premise of guaranteeing that deep pit monitor is feasible.And the advantages of reducing difficulty of construction, accelerating works progress, reduce engineering cost, inherit concrete fender post system and diaphram wall system, the shortcomings that both avoiding;Bracing members and anchor pole collective effect simultaneously, reduce the requirement of construction site, and the dismounting of bracing members later period is more convenient.

Description

Sand gravel geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support
Technical field
The present invention relates to a kind of Construction of Civil Engineering steel anchor method for protecting support, and in particular to sand gravel geology Among Piles In Deep Foundation Pit formula connects Continuous wall steel anchor method for protecting support, belongs to underground engineering field.
Background technique
Urban transportation plays a crucial role the development of economic, the social people's livelihood, and subway is as special traffic work Have the traffic pressure in city of largely having releived, is made that huge contribution for the fast development of modern city.Due to The variability of geological conditions, so the steel anchor support pattern used is also had nothing in common with each other, and deep basal pit is opened during subway construction Digging supporting becomes technical problem.Sand gravel geology is widely distributed in China, and deep foundation pit support is very common.Such as subway station, people's air defense work Journey, skyscraper, market place builet below the ground, underground pipe gallery etc., since sand gravel geology deep foundation pit support does not have systematic Study, so one As the deep foundation pit support of sand gravel geology be all deep foundation pit support directly with reference to other areas, or select a kind of deep pit support The optimization for carrying out thin portion parameter after shield scheme to it, wastes many times and engineering cost.
Currently, most common four kinds of support systems are respectively in sand gravel geology deep pit digging supporting: drilling fender post+ Suspension roof support system, this system subway and deep foundation pit of tall buildings all in be widely used, its construction application is flexible, still The deformation of stake is excessive in ultra-deep foundation pit, and the soil body requirement in anchor bolt construction space is openr, is not suitable for applying under crowded environment Work;Drilling fender post+inner support support system is conducive to control foundation pit deformation, but the dismounting cost in later period is larger, when construction Between it is longer;Though drilling fender post+anchor pole+inner support support system has the advantages that the above two, it is not suitable for cheating outer construction Build the too complicated foundation pit of object;Diaphram wall+anchor pole+inner support support system stiffness by itself is bigger, good integrity, But the joint quality of diaphram wall is difficult to control, and be easy to cause the weak spot of structure.
Summary of the invention
The purpose of the present invention is overcoming the defect of current sand gravel geology deep pit digging method for protecting support, a kind of sand ovum is disclosed Stone geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support.
The present invention is achieved by the following technical solutions:
A. according to the geological mapping of foundation pit as a result, calculating between the insertion depth of fender post, the diameter of fender post, fender post Away from and arrangement of reinforcement;
B. the excavation place of smooth mistake is pinpointed with design scheme, according to the construction work of steel reinforced concrete fender post Skill constructs to concrete fender post 1;
C. concrete continuous wall 3 is formed between concrete fender post using the form of rotary churning pile 2, is formed simultaneously sealing curtain The barrier of curtain;
D. it constructs to crown beam 4, forms whole building enclosure with fender post;
E. after the completion of building enclosure is constructed, precipitation is carried out to foundation pit using precipitation scheme, is started gradually after the completion of precipitation Excavation pit;
When f. to the depth of excavation of foundation pit to design requirement, hanging plate 6 is hung up at the crown beam 4 for going along with sb. to guard him stake top, setting is together Bracing members 5, and the given prestressing force of design is applied to bracing members 5, to ensure the stability of structure;
G. anchor cable is added at the design position of foundation pit to fix, bore position is squeezed at the center of 1 spacing of concrete fender post Concrete is gone along with sb. to guard him after steel strand wires 8, correcting wedge 9 sets up waist rail 10 and supports on diaphragm wall surface, then is twisted with anchorage extended steel Line is simultaneously fixed with fixture 11 and gasket 12, forms prestress anchorage cable 13;
H. tripod 14 is anchored into fender post 1 to design Support Position in excavation of foundation pit, sets up steel and encloses wingceltis 7 and will hang Plate 6 hangs over steel and encloses on wingceltis 7, while setting up bracing members 5, and applies the given prestressing force of design to bracing members 5, while to supporting knot Structure carries out sidesway monitoring.
Reasonably selected after being computed according to specification regulation the diameter of concrete fender post, fender post center away from crown beam Size, determines the model of the grade and reinforcing bar using concrete, and the building-in depth of fender post determines design bracing members and draws anchor Quantity and its position;Further according to the soil layer information that exploration obtains, the stress of rod piece is calculated, then calculate internal force and the position of rod piece It moves;According to the internal force being calculated, then the arrangement of reinforcement of fender post is calculated, the configuration of anchor pole and the type selecting of bracing members;To calculated result It is checked, it is ensured that the stability of structure checks the maximal displacement of structure: Δ≤ΔuIn formula: Δ refers to the maximal displacement of structure; ΔuRefer to the maximal displacement for allowing structure, it is related with security level.
The advantage and disadvantage of comparative analysis of the present invention various application methods at present are closed under the premise of guaranteeing that deep pit monitor is feasible Reason utilizes limited place, reduces engineering cost and risk, meets the requirement of environmental protection, and construction technology is simplified, and shortens Duration makes construction method reach the effect of other method for protecting support, and reduces difficulty of construction compared to other method for protecting support, adds Fast construction progress is but kept away the advantages of reducing engineering cost, remain concrete fender post system and diaphram wall system The shortcomings that having exempted from the two;Bracing members and anchor pole collective effect simultaneously, construction site require to reduce, and the bracing members later period removes more square Just.Make support system being optimal between the effect of excavation supporting, engineering cost and construction progress three.
Detailed description of the invention
Attached drawing 1 is the floor map that the present invention constructs.
Attached drawing 2 is the longitudinal profile schematic diagram that the present invention constructs.
Attached drawing 3 is the horizontal section schematic diagram that the present invention constructs.
The reference numerals are as follows: fender post 1, rotary churning pile 2, diaphragm wall 3, crown beam 4, bracing members 5, hanging plate 6, steel Enclose wingceltis 7, steel strand wires 8, correcting wedge 9, waist rail 10, fixture 11, gasket 12, prestress anchorage cable 13, tripod 14.
Specific embodiment
Below in conjunction with attached drawing, the invention will be described in further detail:
A. according to the geological mapping of foundation pit as a result, calculate the insertion depth of fender post, the diameter of fender post, fender post away from And arrangement of reinforcement;
B. smooth to place progress, fender post is positioned by design position, according to applying for steel reinforced concrete fender post Work technique carries out artificial inspecting hole, mechanical hole building, filling concrete to concrete fender post 1 and constructs;
C. it constructs to rotary churning pile 2, forms concrete continuous wall 3, while shape after the completion of construction with concrete fender post At the barrier of water-stop curtain;
D. formwork is carried out to crown beam 4, binds the configuration reinforcement and casting concrete of crown beam, it is made to form entirety with fender post Building enclosure;
E. after the completion of building enclosure is constructed, according to precipitation scheme to precipitation well construction, precipitation to design Foundation Pit bottom one Rice is hereinafter, start gradually excavation pit;
When f. to the depth of excavation of foundation pit to design requirement, hanging plate 6 is hung up at the crown beam 4 for going along with sb. to guard him stake top, and using swollen Swollen bolt is fixed, and one of bracing members 5 is arranged, and apply the given prestressing force of design to bracing members, to ensure the stability of structure;
G. anchor cable is added at the design position of foundation pit to fix, bore position is squeezed at the center of 1 spacing of concrete fender post Concrete is gone along with sb. to guard him after steel strand wires 8, correcting wedge 9 sets up waist rail 10 and supports on diaphragm wall surface, then is twisted with anchorage extended steel Line is simultaneously fixed with fixture 11 and gasket 12, after slurry intensity reaches design value, carries out steel strand tension, forms prestress anchorage cable 13;
H. in excavation of foundation pit to design Support Position, tripod 14 is anchored into fender post 1 using expansion bolt, steel is enclosed Wingceltis 7 is erected on tripod, and hanging plate 6 is hung over steel and is enclosed on wingceltis 7, while setting up bracing members 5, and applies to bracing members 5 and design Given prestressing force, while sidesway monitoring is carried out to supporting construction.
Sidesway monitoring calculation example: existing sand gravel geology deep basal pit, the cutting depth of foundation pit are 8m, the geology of foundation pit Condition is as follows: miscellaneous fill, with a thickness of 3m, severe 18kN/m3, cohesive strength 3kPa, internal friction angle is 15 °, cohesive soil, thickness For 2m, severe 20kN/m3, cohesive strength 25kPa, internal friction angle is 11 °, round gravel, with a thickness of 20m, severe 25kN/m3, Cohesive strength is 30kPa, and internal friction angle is 13 °, and buoyant weight degree is 15kN/m3, underwater cohesive strength is 30kPa, and underwater internal friction angle is 13 °, under soil layer be all rock stratum.
The diameter of the concrete fender post of selection is 0.8m, and the spacing of fender post is 1.6m, using C30 grade concrete, Building-in depth is 9m, and one of I-shaped bracing members is arranged at crown beam, and depth is that anchor is drawn in setting together at 3m, and depth is to be arranged at 6m One of I-shaped bracing members determines internal force and displacement according to calculation diagram, carries out structure design.
Maximal displacement is 4mm on the inside of the foundation pit of computation model, and the security level of this foundation pit is level-one, and permission maximal displacement is 0.0025h checks the maximal displacement of foundation pit: Δ=4mm≤Δu=0.0025 × 8000=20mm event, is designed feasible.

Claims (2)

1. sand gravel geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support, it is characterised in that: be real by the following technical programs Existing:
A. according to the geological mapping of foundation pit as a result, calculate the insertion depth of fender post, the diameter of fender post, fender post spacing with And arrangement of reinforcement;
B. the excavation place of smooth mistake is pinpointed with design scheme, it is right according to the construction technology of steel reinforced concrete fender post Concrete fender post (1) is constructed;
C. concrete continuous wall (3) are formed between concrete fender post using the form of rotary churning pile (2), is formed simultaneously sealing curtain The barrier of curtain;
D. it constructs to crown beam (4), forms whole building enclosure with fender post;
E. after the completion of building enclosure is constructed, precipitation is carried out to foundation pit using precipitation scheme, starts gradually to excavate after the completion of precipitation Foundation pit;
It when f. to the depth of excavation of foundation pit to design requirement, is hung up hanging plate (6) at the crown beam (4) for going along with sb. to guard him stake top, setting is together Bracing members (5), and the given prestressing force of design is applied to bracing members (5), to ensure the stability of structure;
G. anchor cable is added at the design position of foundation pit to fix, bore position squeezes into steel at the center of concrete fender post (1) spacing Twisted wire goes along with sb. to guard him concrete after (8), sets up waist rail (10) with correcting wedge (9) on diaphragm wall surface and supports, then is stretched with anchorage Steel strand wires are simultaneously fixed with fixture (11) and gasket (12), formed prestress anchorage cable (13);
H. tripod (14) is anchored into fender post (1) to design Support Position in excavation of foundation pit, erection steel encloses wingceltis (7) and will Hanging plate (6) hangs over steel and encloses on wingceltis (7), while setting up bracing members (5), and applies the given prestressing force of design to bracing members (5), together When to supporting construction carry out sidesway monitoring.
2. sand gravel geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support according to claim 1, it is characterised in that:
B. smooth to place progress, fender post is positioned by design position, according to the construction work of steel reinforced concrete fender post Skill carries out artificial inspecting hole, mechanical hole building, filling concrete to concrete fender post (1) and constructs;
D. formwork is carried out to crown beam (4), binds the configuration reinforcement and casting concrete of crown beam, it is made to form whole enclose with fender post Protection structure;
E. after the completion of building enclosure is constructed, according to precipitation scheme to precipitation well construction, precipitation to design one meter of Foundation Pit bottom with Under, start gradually excavation pit;
It when f. to the depth of excavation of foundation pit to design requirement, is hung up hanging plate (6) at the crown beam (4) for going along with sb. to guard him stake top, and using swollen Swollen bolt is fixed, and one of bracing members (5) is arranged, and apply the given prestressing force of design to bracing members, to ensure the stabilization of structure Property;
G. anchor cable is added at the design position of foundation pit to fix, bore position squeezes into steel at the center of concrete fender post (1) spacing Twisted wire goes along with sb. to guard him concrete after (8), sets up waist rail (10) with correcting wedge (9) on diaphragm wall surface and supports, then is stretched with anchorage Steel strand wires are simultaneously fixed with fixture (11) and gasket (12), after slurry intensity reaches design value, carry out steel strand tension, formed pre- Stress anchor cable (13);
H. in excavation of foundation pit to design Support Position, tripod (14) is anchored into fender post 1 using expansion bolt, steel is enclosed into wingceltis (7) it is erected on tripod, and hanging plate (6) is hung over into steel and is enclosed on wingceltis (7), while setting up bracing members (5), and to bracing members (5) Apply the given prestressing force of design, while sidesway monitoring is carried out to supporting construction.
CN201910821716.0A 2019-08-30 2019-08-30 Sand gravel geology Among Piles In Deep Foundation Pit formula diaphragm wall steel anchor method for protecting support Pending CN110485433A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110820763A (en) * 2019-11-29 2020-02-21 兰州理工大学 Truss type cast-in-situ bored pile supporting method for mucky soil deep foundation pit

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CN202969392U (en) * 2012-12-06 2013-06-05 中铁四局集团有限公司 Complex geology deep excavation pit combined support
CN203440821U (en) * 2013-07-17 2014-02-19 广州中煤江南基础工程公司 Closed type barrel supporting structure
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110820763A (en) * 2019-11-29 2020-02-21 兰州理工大学 Truss type cast-in-situ bored pile supporting method for mucky soil deep foundation pit

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Application publication date: 20191122

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