CN104372793A - Anti-floating method used for existing basement by adopting pre-stressed anchor cables in jet grouting pile method - Google Patents

Anti-floating method used for existing basement by adopting pre-stressed anchor cables in jet grouting pile method Download PDF

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Publication number
CN104372793A
CN104372793A CN201410624063.4A CN201410624063A CN104372793A CN 104372793 A CN104372793 A CN 104372793A CN 201410624063 A CN201410624063 A CN 201410624063A CN 104372793 A CN104372793 A CN 104372793A
Authority
CN
China
Prior art keywords
basement
anchor
floating
jet grouting
cable
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
CN201410624063.4A
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Chinese (zh)
Inventor
王智群
瞿杏青
袁峰
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GEOTECHNICAL TECHNOLOGY Co Ltd
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GEOTECHNICAL TECHNOLOGY 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 GEOTECHNICAL TECHNOLOGY Co Ltd filed Critical GEOTECHNICAL TECHNOLOGY Co Ltd
Priority to CN201410624063.4A priority Critical patent/CN104372793A/en
Publication of CN104372793A publication Critical patent/CN104372793A/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
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
    • E02D31/12Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
    • 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
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • 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
    • E02D5/74Means for anchoring structural elements or bulkheads
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0046Production methods using prestressing techniques

Abstract

The invention relates to an anti-floating method used for an existing basement by adopting pre-stressed anchor cables in a jet grouting pile method. The anti-floating method has the advantages that the diameter of a formed hole is small, structural integrity is unaffected and anti-floating capacity is high. According to the technical scheme, the anti-floating method includes the following step that (1) a plurality of dewatering wells are arranged at outdoor positions nearby the basement; (2) at least one through hole is drilled in a bottom plate of the basement; (3) a jet grouting pile is constructed through the through holes; (4) an anchor plate connected with the anchor cables is pressed in a jet grouting body through a drilling rig and pushed into the bottom end of the jet grouting body; (5) a tensioning machine is arranged, and the anchor cables are tensioned to generate prestress after the strength of slurry of the jet grouting pile reaches 80%; (6) after tensioning is finished, the top ends of the anchor cables maintaining tension are fixed to the anchor plate, and finally the bottom plate is covered with micro-expansion concrete for repairing.

Description

Rotary churning pile method prestress anchorage cable is adopted to be used for the method for existing basement anti-floating
Technical field
The present invention relates to a kind of construction techniques, adopt rotary churning pile in conjunction with the anti-floating of prestress anchorage cable for existing basement.
Background technology
When the shortage in weight of basement superstructure is to offset buoyancy force of underground water, often there is the phenomenon of basement floating-up, have a strong impact on building normal, safe handling and structural safety.The existing basement anti-floating of China mainly adopts two schemes: one, utilize basement structure to conduct oneself with dignity or counterweight anti-floating, and the construction of this method is simple, instant effect, but more by site condition restriction; Two, anti-float anchor rod or anti-floating pile, utilizes the frictional force of anchor pole or stake to offset underground buoyancy of water, prevents building to top offset.
The anti-float anchor rod that existing building basement anti-floating adopts generally adopts root pile mode to make, namely first on base plate pore-forming (aperture is generally between 200-250mm, former basement baseplate reinforcing bar need be destroyed), then Anti-floating reinforcing steel bar and Grouting Pipe is placed, insert coarse aggregate again, then pass through injection forming.This construction method basement bottom board becomes bore open comparatively large, destroys the globality of former basement structure; Bolt diameter is little simultaneously, and the frictional force produced between ground is little, and anti-floating ability is inadequate.
Summary of the invention
The object of the invention is to overcome the deficiency in above-mentioned background technology, provide a kind of rotary churning pile that adopts in conjunction with the method for prestress anchorage cable for the anti-floating of existing basement, the method should have pore-forming aperture little, do not affect structural integrity, feature that anti-floating ability is strong.
Technical scheme provided by the invention is: adopt rotary churning pile method prestress anchorage cable to be used for the method for existing basement anti-floating, carry out according to the following steps:
1) several dewatering wells of outdoor laying near basement, draw water with dewatering by dewatering well;
2) basement bottom board drills at least one through hole; Requirement drills basement bottom board and bed course;
3) carry out jet grouting pile construction by through hole, below basement bottom board, form the churning body being full of cement paste with certain depth;
4) will the form anchor press-in churning body of anchor cable be connected with by rig, and be headed into the bottom of churning body;
The bottom of described anchor cable is fixed on form anchor, and top extends to more than basement bottom board and reserves free end afterwards through the boring on anchor plate; Again the reinforcement welding of anchor plate and basement bottom board is fixed;
5) set tensioner, after rotary churning pile body slurry intensity arrives 80%, make it produce prestressing force with regard to stretch-draw anchor;
6), after stretch-draw, be fixed on anchor plate by keeping the anchor cable top of tension force; Finally adopt slightly expanded concrete to cover base plate to repair.
Described step 2) in boring rig and jet grouting pile construction facility all need, by the repacking of basement clear height, to guarantee to use smoothly in narrow and small short space.
Described step 2) in the aperture of basement bottom board be φ 75mm.
Described step 3) in jet grouting pile construction select substance pipe or dual pipe construction technology.
Described step 6) in anchor cable by welding or buckle mooring anchor backing plate on.
Described anchor cable is made up of at least two steel strand.
The invention has the beneficial effects as follows:
One, construction method of the present invention becomes bore open little in basement bottom board, can avoid the reinforcing bar in base plate, and the least possible destruction reinforcing bar, ensure that the globality of basement structure.
Two, owing to becoming bore open little, thus less-restrictive, anchor cable is arranged more flexible.
Three, in soft clay area, for root pile anti-floating engineering method, the anti-floating power of this engineering method increases greatly, efficiently solves the anti-floating problem of existing basement.
Accompanying drawing explanation
Fig. 1 is main TV structure schematic diagram of the present invention.
Fig. 2 is the annexation schematic diagram of baseplate reinforcing bar and anchor plate in the present invention.
Fig. 3 is the annexation enlarged diagram of anchor cable and form anchor.
Detailed description of the invention
Rotary churning pile is a design altitude at the bottom of utilizing rig rotary jet grouting pipe and shower nozzle to be bored to be placed in, after making liquid stream obtain huge energy by high-voltage generator the cement grout prepared in advance, eject from the nozzle high speed of slip casting tube edge, form the liquid stream that one energy height is concentrated, directly destroy the soil body; In course of injection, rotation limit, drilling rod limit promotes, and cement grout and the soil body is fully uniformly mixed, forms the column induration of certain diameter, thus make ground reach reinforcing in soil.Generally be divided into two workflows in construction, namely spray after subdrilling, then under bore injection, then promote stirring, ensure cement grout content and the quality of every meter of stake.
Below in conjunction with Figure of description, the invention will be further described.
Employing rotary churning pile method prestress anchorage cable described in accompanying drawing is used for the method for existing basement anti-floating, carries out according to the following steps:
1) by basement clear height repacking rig and spray pile driving construction facility, guarantee to use smoothly in narrow and small short space;
2) lay dewatering well, timely groundwater abstraction is with dewatering; Usual dewatering well open area disposed in the outdoor;
3) in basement bottom board boring, recommend to adopt XY-1 type core-drill(ing) machine, after requiring to drill basement bottom board and foundation pad, form through hole (aperture is preferably φ 75mm);
4) jet grouting pile construction is carried out by through hole, below basement bottom board, form the churning body (churning bore and length are determined according to design Anti-floating design bearing capacity) being full of cement paste with certain depth, substance pipe, dual pipe construction technology can be selected;
5) being had being in the form anchor press-in churning body of anchor cable by rig, form anchor top should be depressed into the bottom of churning body;
Described anchor cable is at least two steel strand, and bottom is fixed on form anchor, and top extends to more than basement bottom board and reserves free end afterwards through the boring on anchor plate; Again the baseplate reinforcing bar at anchor plate and basement bottom board through hole position is welded and fixed;
As shown in Figure 3, the fixed form of anchor cable bottom and form anchor preferred tapered end sleeve (lockset fixed by the conventional steel cable of outsourcing);
(overlook direction) as shown in Figure 2, anchor plate lies in above baseplate reinforcing bar, then anchor plate and baseplate reinforcing bar is welded and fixed and is integrated;
6) set tensioner (adopting conventional hoist engine), after rotary churning pile body slurry intensity arrives 80%, carry out stretch-draw anchor make it produce prestressing force;
7) after stretch-draw, the anchor cable top that remain tension force to be fixed on backing plate (fixing by welding or buckle or tapered end sleeve); Slightly expanded concrete (recommending the slightly expanded concrete of a high grade) is finally adopted to cover base plate reparation.

Claims (6)

1. adopt rotary churning pile method prestress anchorage cable to be used for the method for existing basement anti-floating, carry out according to the following steps:
1) several dewatering wells of outdoor laying near basement, draw water with dewatering by dewatering well;
2) basement bottom board drills at least one through hole; Requirement drills basement bottom board and bed course;
3) carry out jet grouting pile construction by through hole, below basement bottom board, form the churning body being full of cement paste with certain depth;
4) will the form anchor press-in churning body of anchor cable be connected with by rig, and be headed into the bottom of churning body;
The bottom of described anchor cable is fixed on form anchor, and top extends to more than basement bottom board and reserves free end afterwards through the boring on anchor plate; Again the reinforcement welding of anchor plate and basement bottom board is fixed;
5) set tensioner, after rotary churning pile body slurry intensity arrives 80%, make it produce prestressing force with regard to stretch-draw anchor;
6), after stretch-draw, be fixed on anchor plate by keeping the anchor cable top of tension force; Finally adopt slightly expanded concrete to cover base plate to repair.
2. employing rotary churning pile method prestress anchorage cable according to claim 1 is used for the method for existing basement anti-floating, it is characterized in that: described step 2) in boring rig and jet grouting pile construction facility all need, by the repacking of basement clear height, to guarantee to use smoothly in narrow and small short space.
3. employing rotary churning pile method prestress anchorage cable according to claim 1 is used for the method for existing basement anti-floating, it is characterized in that: described step 2) in the aperture of basement bottom board be φ 75mm.
4. employing rotary churning pile method prestress anchorage cable according to claim 1 is used for the method for existing basement anti-floating, it is characterized in that: described step 3) in jet grouting pile construction select substance pipe or dual pipe construction technology.
5. employing rotary churning pile method prestress anchorage cable according to claim 1 is used for the method for existing basement anti-floating, it is characterized in that: described step 6) in anchor cable by welding or buckle mooring anchor backing plate.
6. the employing rotary churning pile method prestress anchorage cable according to Claims 2 or 3 or 4 or 5 is used for the method for existing basement anti-floating, it is characterized in that: described anchor cable is made up of at least two steel strand.
CN201410624063.4A 2014-11-07 2014-11-07 Anti-floating method used for existing basement by adopting pre-stressed anchor cables in jet grouting pile method Pending CN104372793A (en)

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CN201410624063.4A CN104372793A (en) 2014-11-07 2014-11-07 Anti-floating method used for existing basement by adopting pre-stressed anchor cables in jet grouting pile method

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Application Number Priority Date Filing Date Title
CN201410624063.4A CN104372793A (en) 2014-11-07 2014-11-07 Anti-floating method used for existing basement by adopting pre-stressed anchor cables in jet grouting pile method

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CN104372793A true CN104372793A (en) 2015-02-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104674809A (en) * 2015-03-06 2015-06-03 中国建筑第八工程局有限公司 Anti-floating anchor rod structure and construction method thereof
CN107338792A (en) * 2017-06-16 2017-11-10 中建市政工程有限公司 A kind of prestressing force cement mixing method and its construction method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101736760A (en) * 2009-12-25 2010-06-16 上海智平基础工程有限公司 Prestressed anti-floating anchor rod and construction method thereof
CN102330427A (en) * 2011-07-23 2012-01-25 上海强劲地基工程股份有限公司 Stiffening pile with high uplift resistance
CN202401478U (en) * 2012-03-06 2012-08-29 徐金 Anti-floating anchor bolt bundle
CN202559345U (en) * 2012-02-23 2012-11-28 山东同圆设计集团有限公司 Bottom-expanded pre-stress anti-floating anchor rod
KR20140062914A (en) * 2012-11-15 2014-05-27 주식회사 삼우기초기술 Construction method for extending bulb of the ground anchor by post grouting and bulb extending apparatus being used for the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101736760A (en) * 2009-12-25 2010-06-16 上海智平基础工程有限公司 Prestressed anti-floating anchor rod and construction method thereof
CN102330427A (en) * 2011-07-23 2012-01-25 上海强劲地基工程股份有限公司 Stiffening pile with high uplift resistance
CN202559345U (en) * 2012-02-23 2012-11-28 山东同圆设计集团有限公司 Bottom-expanded pre-stress anti-floating anchor rod
CN202401478U (en) * 2012-03-06 2012-08-29 徐金 Anti-floating anchor bolt bundle
KR20140062914A (en) * 2012-11-15 2014-05-27 주식회사 삼우기초기술 Construction method for extending bulb of the ground anchor by post grouting and bulb extending apparatus being used for the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104674809A (en) * 2015-03-06 2015-06-03 中国建筑第八工程局有限公司 Anti-floating anchor rod structure and construction method thereof
CN107338792A (en) * 2017-06-16 2017-11-10 中建市政工程有限公司 A kind of prestressing force cement mixing method and its construction method

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Application publication date: 20150225