CN102286979A - Construction method for deep foundation pit supporting by adopting steel pipe piles-self-drilling prestressed anchor bars - Google Patents

Construction method for deep foundation pit supporting by adopting steel pipe piles-self-drilling prestressed anchor bars Download PDF

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Publication number
CN102286979A
CN102286979A CN2011101374910A CN201110137491A CN102286979A CN 102286979 A CN102286979 A CN 102286979A CN 2011101374910 A CN2011101374910 A CN 2011101374910A CN 201110137491 A CN201110137491 A CN 201110137491A CN 102286979 A CN102286979 A CN 102286979A
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CN
China
Prior art keywords
steel pipe
drilling
anchor bars
foundation pit
pipe pile
Prior art date
Application number
CN2011101374910A
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Chinese (zh)
Inventor
葛加君
杨炳庆
朱丹
熊栗志
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昆明二建建设(集团)有限公司
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Publication date
Application filed by 昆明二建建设(集团)有限公司 filed Critical 昆明二建建设(集团)有限公司
Priority to CN2011101374910A priority Critical patent/CN102286979A/en
Publication of CN102286979A publication Critical patent/CN102286979A/en

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Abstract

The invention discloses a construction method for deep foundation pit supporting by adopting steel pipe piles-self-drilling prestressed anchor bars. The construction method comprises the following steps: retaining soil by adopting steel pipe pile groups of vertical vibrating sunk pipe piles; obliquely drilling self-drilling anchor bars with spiral bits into soil layers outside a foundation pit by adopting the drilling rig power, lengthening the anchor bars by adopting handshake wire joints, carrying out high-pressure grouting on the central holes of the anchor bars from the tails of the anchor bars and injecting liquid cement slurry into the surrounding soil from the middle-front parts of the anchor bars and bit openings to form anchored tips of cement soil slurry expanded heads; carrying out prestressed tensioning and locking on the anchor bars by using a prestressed tensioning machine to lock the anchor bars on horizontal steel crossbeams laid on the steel pipe piles to form steel pipe pile force bearing seats to obtain the active supporting and anchoring tension; and injecting fine aggregate concrete along the facade of the foundation pit by utilizing compressed air to form a compact concrete pavement to prevent soil loss. The construction method has the advantages of convenience for construction, high construction speed and stable and reliable force bearing effect.

Description

Steel pipe pile-self-drilling pre-stress anchor rod deep foundation pit support job practices
Technical field
The present invention relates to a kind of deep foundation pit support job practices.
Background technology
Along with the construction of various underground excavation projects needs, guarantee normally using and satisfying building place construction operation condition of foundation ditch surrounding building safety and stability, peripheral path, need carry out necessary pattern foundation pit supporting structure.
Summary of the invention
The object of the present invention is to provide a kind of easy construction, the steel pipe pile of good working effect-self-drilling pre-stress anchor rod deep foundation pit support job practices.
Technical solution of the present invention is:
A kind of steel pipe pile-self-drilling pre-stress anchor rod deep foundation pit support job practices is characterized in that: comprise the following steps:
(1) adopt the steel pipe pile group retaining of vertical motion pipeline sinking pile native;
(2) automatic anchor pole that will have an augers pierces soil layer outside the foundation ditch through rig power is oblique, the continuous long jointing of shaking hands that adopts of anchor pole, from the afterbody of anchor pole to anchor pole centre bore high-pressure slip-casting, the liquid cement slurry sprays the peripheral soil of injection from anchor pole middle front part and drill bit hole, forms cement-soil slurry enlarged footing anchoring termination;
(3) with the prestressing force machine drawing anchor pole is carried out prestressed stretch-draw locking, anchor pole is locked on the horizontal type gooseneck on the steel pipe pile that is laid in, forms the stressed bearing of steel pipe pile, obtains active support anchoring pulling force;
(4) utilize compressed air to spray pea gravel concreten, form closely knit concrete pavement, stop the loss of soil along the foundation ditch facade.
Long or when meeting winter severe cold, step (4) adopts layering to spray pea gravel concreten, and between the pea gravel concreten layer reinforced mesh is set for the duration, reinforced mesh is connected with stake, horizontal type gooseneck and anchor pole, rises freeze proof and disperses partly native lateral pressure.
During step (2) slip casting, slurry adopts P0.32.5 silicate cement mud, and the water/binder ratio of cement paste is 0.4 ~ 0.5.
The horizontal type gooseneck adopts 2 channel-section steels, and is integrally welded with ironware.
Step (4) is sprayed pea gravel concreten, and concrete Pueraria lobota set of dispense composition and division in a proportion is a cement: sand: rubble=1:2::2, and cement adopts the P0.32.5 portland cement, and strength grade is C20, and the fineness modulus of sand is 2.5 ~ 3.0, and moisture content is 5 ~ 7%, the particle diameter of rubble is less than 15mm; Spray the thick 50 ~ 90mm of being of pea gravel concreten.
Easy construction of the present invention, speed of application is fast, and stressed effect is reliable and stable.
The invention will be further described below in conjunction with embodiment.
The specific embodiment
A kind of steel pipe pile-self-drilling pre-stress anchor rod deep foundation pit support job practices comprises the following steps:
(1) adopt the steel pipe pile group retaining of vertical motion pipeline sinking pile native;
(2) automatic anchor pole that will have an augers pierces soil layer outside the foundation ditch through rig power is oblique, the continuous long jointing of shaking hands that adopts of anchor pole, from the afterbody of anchor pole to anchor pole centre bore high-pressure slip-casting, the liquid cement slurry sprays the peripheral soil of injection from anchor pole middle front part and drill bit hole, forms cement-soil slurry enlarged footing anchoring termination;
(3) with the prestressing force machine drawing anchor pole is carried out prestressed stretch-draw locking, anchor pole is locked on the horizontal type gooseneck on the steel pipe pile that is laid in, forms the stressed bearing of steel pipe pile, obtains active support anchoring pulling force;
(4) utilize compressed air to spray pea gravel concreten, form closely knit concrete pavement, stop the loss of soil along the foundation ditch facade.
Long or when meeting winter severe cold, step (4) adopts layering to spray pea gravel concreten, and between the pea gravel concreten layer reinforced mesh is set for the duration, reinforced mesh is connected with stake, horizontal type gooseneck and anchor pole, rises freeze proof and disperses partly native lateral pressure.
During step (2) slip casting, slurry adopts P0.32.5 silicate cement mud, and the water/binder ratio of cement paste is 0.4 ~ 0.5.
The horizontal type gooseneck adopts 2 channel-section steels, and is integrally welded with ironware.
Step (4) is sprayed pea gravel concreten, and concrete Pueraria lobota set of dispense composition and division in a proportion is a cement: sand: rubble=1:2::2, and cement adopts the P0.32.5 portland cement, and strength grade is C20, and the fineness modulus of sand is 2.5 ~ 3.0, and moisture content is 5 ~ 7%, the particle diameter of rubble is less than 15mm; Spray the thick 50 ~ 90mm of being of pea gravel concreten.

Claims (5)

1. steel pipe pile-self-drilling pre-stress anchor rod deep foundation pit support job practices is characterized in that: comprise the following steps:
(1) adopt the steel pipe pile group retaining of vertical motion pipeline sinking pile native;
(2) automatic anchor pole that will have an augers pierces soil layer outside the foundation ditch through rig power is oblique, the continuous long jointing of shaking hands that adopts of anchor pole, from the afterbody of anchor pole to anchor pole centre bore high-pressure slip-casting, the liquid cement slurry sprays the peripheral soil of injection from anchor pole middle front part and drill bit hole, forms cement-soil slurry enlarged footing anchoring termination;
(3) with the prestressing force machine drawing anchor pole is carried out prestressed stretch-draw locking, anchor pole is locked on the horizontal type gooseneck on the steel pipe pile that is laid in, forms the stressed bearing of steel pipe pile, obtains active support anchoring pulling force;
(4) utilize compressed air to spray pea gravel concreten, form closely knit concrete pavement, stop the loss of soil along the foundation ditch facade.
2. steel pipe pile according to claim 1-self-drilling pre-stress anchor rod deep foundation pit support job practices, it is characterized in that: long or when meeting winter severe cold for the duration, step (4) adopts layering to spray pea gravel concreten, and between the pea gravel concreten layer, reinforced mesh is set, reinforced mesh is connected with stake, horizontal type gooseneck and anchor pole, plays lateral pressure freeze proof and dispersion part soil.
3. steel pipe pile according to claim 1 and 2-self-drilling pre-stress anchor rod deep foundation pit support job practices is characterized in that: during step (2) slip casting, slurry adopts P0.32.5 silicate cement mud, and the water/binder ratio of cement paste is 0.4 ~ 0.5.
4. steel pipe pile according to claim 1 and 2-self-drilling pre-stress anchor rod deep foundation pit support job practices is characterized in that: the horizontal type gooseneck adopts 2 channel-section steels, and is integrally welded with ironware.
5. steel pipe pile according to claim 1 and 2-self-drilling pre-stress anchor rod deep foundation pit support job practices, it is characterized in that: step (4) is sprayed pea gravel concreten, concrete Pueraria lobota set of dispense composition and division in a proportion is a cement: sand: rubble=1:2::2, cement adopts the P0.32.5 portland cement, strength grade is C20, the fineness modulus of sand is 2.5 ~ 3.0, and moisture content is 5 ~ 7%, and the particle diameter of rubble is less than 15mm; Spray the thick 50 ~ 90mm of being of pea gravel concreten.
CN2011101374910A 2011-05-26 2011-05-26 Construction method for deep foundation pit supporting by adopting steel pipe piles-self-drilling prestressed anchor bars CN102286979A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN2011101374910A CN102286979A (en) 2011-05-26 2011-05-26 Construction method for deep foundation pit supporting by adopting steel pipe piles-self-drilling prestressed anchor bars

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102996142A (en) * 2012-12-25 2013-03-27 中鼎国际工程有限责任公司 Mine tunnel supporting structure with fixed hanging rings and construction method thereof
CN103061347A (en) * 2013-01-15 2013-04-24 中冶沈勘工程技术有限公司 Deep foundation pit support structure acting with soil
CN104499491A (en) * 2014-12-19 2015-04-08 兰州理工大学 Drainage composite self-drilling tire stringed bolt supporting structure and construction method
CN104878760A (en) * 2015-04-07 2015-09-02 兰州理工大学 Side slope self-drainage electroosmosis anchor rod and construction method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2481759Y (en) * 2001-06-29 2002-03-13 孙洪涛 Steel-pipe pile and anchor bar combined foundation pit supporting member
CN101285309A (en) * 2008-06-06 2008-10-15 南通华汇建筑工程有限公司 Compound support method for deep foundation pit of tall buildings
JP2010053631A (en) * 2008-08-29 2010-03-11 Forest Civil Engineering Facilities Research Institute Retaining wall structure and post installation method for the retaining wall structure
CN101906780A (en) * 2010-07-12 2010-12-08 中铁四局集团第五工程有限公司 Method for protecting and reinforcing anchor rope of steel pipe pile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2481759Y (en) * 2001-06-29 2002-03-13 孙洪涛 Steel-pipe pile and anchor bar combined foundation pit supporting member
CN101285309A (en) * 2008-06-06 2008-10-15 南通华汇建筑工程有限公司 Compound support method for deep foundation pit of tall buildings
JP2010053631A (en) * 2008-08-29 2010-03-11 Forest Civil Engineering Facilities Research Institute Retaining wall structure and post installation method for the retaining wall structure
CN101906780A (en) * 2010-07-12 2010-12-08 中铁四局集团第五工程有限公司 Method for protecting and reinforcing anchor rope of steel pipe pile

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任馨等人: "喷锚网支护技术在高陡边坡防护中的应用", 《四川水力发电》 *
张碧颖: "自钻式预应力中空锚杆在松散土层基坑支护中的应用", 《广西城镇建设》 *
江正荣: "《建筑地基与基础施工手册》", 30 June 2005 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102996142A (en) * 2012-12-25 2013-03-27 中鼎国际工程有限责任公司 Mine tunnel supporting structure with fixed hanging rings and construction method thereof
CN103061347A (en) * 2013-01-15 2013-04-24 中冶沈勘工程技术有限公司 Deep foundation pit support structure acting with soil
CN104499491A (en) * 2014-12-19 2015-04-08 兰州理工大学 Drainage composite self-drilling tire stringed bolt supporting structure and construction method
CN104878760A (en) * 2015-04-07 2015-09-02 兰州理工大学 Side slope self-drainage electroosmosis anchor rod and construction method thereof

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Application publication date: 20111221