CN101736760A - Prestressed anti-floating anchor rod and construction method thereof - Google Patents

Prestressed anti-floating anchor rod and construction method thereof Download PDF

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Publication number
CN101736760A
CN101736760A CN200910200950A CN200910200950A CN101736760A CN 101736760 A CN101736760 A CN 101736760A CN 200910200950 A CN200910200950 A CN 200910200950A CN 200910200950 A CN200910200950 A CN 200910200950A CN 101736760 A CN101736760 A CN 101736760A
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CN
China
Prior art keywords
anchor
bar
anchor pole
prestressed
anchor rod
Prior art date
Application number
CN200910200950A
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Chinese (zh)
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CN101736760B (en
Inventor
陈富海
凌振健
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上海智平基础工程有限公司
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Publication of CN101736760A publication Critical patent/CN101736760A/en
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Publication of CN101736760B publication Critical patent/CN101736760B/en

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Abstract

The invention discloses a prestressed anti-floating anchor rod and a construction method thereof. The invention is characterized in that alignment steel tubes are arranged in an anchor rod body which is formed by a plurality of steel bars uniformly distributed along the circle, the steel bars are provided with a plurality of barbs, the alignment steel tubes are arranged at intervals along the axis of the anchor rod body and are fixedly connected with the steel bars, the barbs are welded with the steel bars. The construction method comprises the following steps: grouting into piles; arranging the anchor rod; locking the anchor rod; and sealing the anchor. Compared with the prior art, the invention has the advantages of simple structure, convenient construction, good anti-floating effect and low cost, especially being applicable to the reconstruction of old buildings with built underground structures and confined water.

Description

A kind of prestressed anti-floating anchor rod and job practices thereof
Technical field
The present invention relates to the anti-floating technical field of underground structure structure, especially a kind of prestressed anti-floating anchor rod and job practices thereof.
Background technology
Anchor pole is with its materials province, fast, the easy construction of work efficiency, be widely used in stability of slope engineering, bridge engineering, deep-foundation pit engineering, tunnel and underground construction at home and abroad, also be applied to simultaneously reinforcing, rush to repair structure that disease occurs, building etc., but the application of anchor pole on the underground structure anti-floating seldom.Along with being on the increase of deep foundation engineering, particularly for the anti-floating requirement of dark big basement, the application of resistance to plucking anchor pole brings great convenience to construction.China's application of resistance to plucking anchor pole in geotechnical anchor engineering also is in the primary stage, and its corresponding design and construction standard and acceptance criteria are imperfect as yet.But flourish along with the coastal area highrise building, the resistance to plucking anchor pole but has vast potential for future development for large quantities of weak soil deep-foundation pit engineerings.
Because there are following two problems in the anti-float anchor rod that at present wide model is used: 1. anchor structure adopts one or more reinforcing bar to tie up weldering, no hangnail can not utilize the frictional resistance of the body of rod and slurry cmpletely; 2. pore-forming often adopts the construction technology of rig pore-forming, mud off, is difficult for pore-forming at soil layers that easily caves in such as ovum gravel, mud matter, and can't reach designing requirement; And at old building renovation and exist the existing basement of artesian water to use.
Summary of the invention
A kind of prestressed anti-floating anchor rod and the job practices thereof that provide at the deficiencies in the prior art is provided, the frictional resistance of anchor bar body and slurry is big, solved the basement anti-floating that soft soil layer comprises the soil layers that easily cave in such as ovum gravel, mud matter, especially be fit to have built underground structure and exist in the old building renovation of artesian water use, anchor structure is simple, cost is low, easy construction, and real is a kind of resources conservation, environmentally friendly job practices.
The object of the present invention is achieved like this: a kind of prestressed anti-floating anchor rod, be characterized in being uniformly distributed along the circumference and be provided with the centering steel pipe in the anchor bar body that constitutes by several bars, reinforcing bar is provided with several hangnails, the centering steel pipe is provided with at interval for several axis along anchor bar body and is affixed with reinforcing bar, hangnail and reinforcing bar welding.
Described hangnail is shaft-like affixed with 20~40 ° of angles and reinforcing bar, and is provided with 1~2 meter interval.
Described centering steel pipe is that 2~3 meters interval is provided with.
A kind of job practices of prestressed anti-floating anchor rod is characterized in that this method comprises: grouting pile-forming, placement anchor pole, anchor pole locking and antiseepage sealing off and covering anchorage, and concrete construction is undertaken by following step:
A, grouting pile-forming
Adopt the high pressure jet grouting pile, the stake footpath is φ 500~φ 800mm, the vertical pore-forming of drilling rod, grouting pressure>25MPa is sprayed greater than the design length 0.5m of anchor pole in angular deviation<1 °, depth of pore forming, flow rate of grouting>30L/min, boring hoisting velocity<20cm/min;
B, placement anchor pole
In the grouting pile-forming hole, place anchor pole at the bottom of stake, clear up pile crown and lay the anchoring pile head unit in the anchor bar body termination;
The locking of c, anchor pole and sealing off and covering anchorage
Treat that big bottom slab concreting is finished and after concrete reaches 80% intensity, the reinforcing bar of anchor bar body is carried out stretch-draw, earlier with 0.1~0.2N t(axial tension design load) is to the pre-stretch-draw of anchor pole 1~2 time, after making anchor bar body straight fully, with 1.05~1.10Nt (axial tension design load) anchor pole is carried out stretch-draw 10~15min, off-load locks to locking design load then, locking back pile crown filling polyamine fat blowing agent carries out antiseepage to be handled, and builds the C35 slightly expanded concrete and carries out sealing off and covering anchorage.
The present invention compared with prior art has simple in structure, easy construction and flexibly, programming is fast, high efficiency, the advantage that cost is low, and the frictional resistance of anchor bar body and slurry is big, and anti-floating is effective, especially is fit to have built underground structure and exists in the old building renovation of artesian water use.
Description of drawings
Accompanying drawing 1 is structural representation of the present invention
Accompanying drawing 2 is accompanying drawing 1 left view
Accompanying drawing 3 is the invention process illustration
The specific embodiment
Consult accompanying drawing 1~accompanying drawing 2, the present invention is uniformly distributed along the circumference by several bars 2 and is provided with centering steel pipe 3 in the anchor bar body 1 that constitutes, and reinforcing bar 2 is provided with several hangnails 4, and to be several be provided with along the axis of anchor bar body 1 interval with 2~3 meters centering steel pipe 3, and affixed with reinforcing bar 2; Hangnail 4 for shaft-like with 1~2 meter be disposed on the reinforcing bar 2, and affixed with 20~40 ° of angles and reinforcing bar 2.
Be example with Tian Yi CITIC Building, Hainan attached building resistance to plucking anchor pole engineering below, the present invention is further elaborated:
Embodiment 1
The former garage basement structure of Tian Yi CITIC Building, Hainan attached building is three layers, is transformed into five layers of concrete structure beam slab according to the garage needs, needs to remove wall, post, beam, plate and the abutment wall concrete structure in the south in the garage abutment wall under the original place.(about 1m is thick for sole plate to be close to six layers of underground garage of concrete structure of the newly-built length 68 in southern side, former garage (L) * 30 (B) * 13 (H) rice, the thick about 0.5m of abutment wall), newly-increased basement anti-floating adopts jet grounting prestress pulling resistant anchor pole, and this engineering resistance to plucking anti-pulling of anchor bar design load is 398KN.
Consult accompanying drawing 3, the present invention is undertaken by following step:
(i), at first construct fender post and fall groundwater level at the bottom of the foundation ditch about 0.5 meter.
(ii), at the bottom of extremely big base plate 6 bed courses of shoveling.
(iii), by the fixed stake of construction layout plan unwrapping wire position, carry out mark and preliminary examination, a stake bit error is controlled within the code requirement.
(iv), spray before the slip casting with the rig pore-forming, bore diameter 117mm, each depth of pore forming is greater than projected depth 0.2m.Borer frame is leveled up during pore-forming, and the drilling tool vertical ground becomes hole perpendicularity≤1%.
(v) spraying operation
The churning frame is in place, and jet pipe begins to mix and send cement paste during down to super projected depth 10cm, opens high-pressure blast and high-pressure slurry then, and design parameters to be reached after the aperture emits slurry normal, begins churning again and promotes, and finishes pile body 9.
If when meeting special circumstances such as fault, jet pipe must could begin to continue spray by decline 10cm, to guarantee the vertical continuity of rotary jet strengthening body in the spray.
Pressure control: when Grouting Pipe is inserted boring, nozzle reaches design elevation can spray slip casting.After the injection grouting parameter reached setting, the technological requirement of pressing rotary jet grouting promoted Grouting Pipe, from bottom to top sprays slip casting.The pressure of water jet is greater than 25MPa, and flow is greater than 30L/min.The boring hoisting velocity is not more than 20cm/min.
(vi) place anchor bar body
Place anchor bar body 1 in pile body 9 at the bottom of stake, 1 meter hangnail 4 is set along the every interval of reinforcing bar 2 total lengths, hangnail 4 is horn-like with reinforcing bar 2 with 40 ° of angles and opens.
(vii) anchor bar body stretch-draw, locking
At first clear up pile crown and lay sleeve pipe 5, sleeve pipe 5 is fixedly installed on the termination of anchor bar body 1, treat that big base plate 6 is built and finish and after concrete reaches 80% intensity, the reinforcing bar 2 of anchor bar body 1 is carried out stretch-draw, before the formal stretch-draw, get the 60KN pulling force to anchor bar body 1 pre-stretch-draw 1~2 time, make anchor bar body 1 straight fully, each position of anchor bar body 1 contacts with slip casting closely, when anchor bar body 1 is stretched to 417.9KN, rock stratum, sandy soil layer are kept 10min, and off-load locks to locking load 398KN then.
(viii) build C35 slightly expanded concrete sealing off and covering anchorage
After treating anchor bar body 1 stretch-draw, locking, 8 pairs of pile crowns of filling polyamine fat blowing agent carry out the antiseepage processing in sleeve pipe 5, build C35 slightly expanded concrete 7 then and carry out sealing off and covering anchorage.

Claims (4)

1. prestressed anti-floating anchor rod, it is characterized in that being uniformly distributed along the circumference and be provided with the centering steel pipe in the anchor bar body that constitutes by several bars, reinforcing bar is provided with several hangnails, and the centering steel pipe is provided with at interval for several axis along anchor bar body and is affixed with reinforcing bar, hangnail and reinforcing bar welding.
2. according to the described prestressed anti-floating anchor rod of claim 1, it is characterized in that described hangnail is shaft-like affixed with 20~40 ° of angles and reinforcing bar, and be provided with 1~2 meter interval.
3. according to the described prestressed anti-floating anchor rod of claim 1, it is characterized in that described centering steel pipe is 2~3 meters interval setting.
4. the job practices of the described prestressed anti-floating anchor rod of claim 1 is characterized in that this method comprises: grouting pile-forming, place anchor pole, anchor pole locking and antiseepage sealing off and covering anchorage, concrete construction is undertaken by following step:
A, grouting pile-forming
Adopt the high pressure jet grouting pile, the stake footpath is φ 500~φ 800mm, the vertical pore-forming of drilling rod, grouting pressure>25MPa is sprayed greater than the design length 0.5m of anchor pole in angular deviation<1 °, depth of pore forming, flow rate of grouting>30L/min, boring hoisting velocity<20cm/min;
B, placement anchor pole
In the grouting pile-forming hole, place anchor pole at the bottom of stake, clear up pile crown and lay the anchoring pile head unit in the anchor bar body termination;
The locking of c, anchor pole and sealing off and covering anchorage
Treat that the big bottom slab concreting of basement is finished and after concrete reaches 80% intensity, the reinforcing bar of anchor bar body is carried out stretch-draw, earlier with 0.1~0.2N t(axial tension design load) to the pre-stretch-draw of anchor pole 1~2 time, make anchor bar body straight fully after, with 1.05~1.10N t(axial tension design load) carries out stretch-draw 10~15min to anchor pole, and off-load locks to locking design load then, and the antiseepage processing is carried out to pile crown filling polyamine fat blowing agent in the locking back, builds the C35 slightly expanded concrete then and carries out sealing off and covering anchorage.
CN2009102009508A 2009-12-25 2009-12-25 Construction method of prestressed anti-floating anchor rod CN101736760B (en)

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Application Number Priority Date Filing Date Title
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CN101736760A true CN101736760A (en) 2010-06-16
CN101736760B CN101736760B (en) 2012-06-06

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101892666A (en) * 2010-07-13 2010-11-24 张家港固耐特围栏系统有限公司 Ground pile for installing stand column
CN101914915A (en) * 2010-07-24 2010-12-15 烟台市工程勘察有限公司 Construction method for anti-floating anchor rod and special long auger
CN102182196A (en) * 2011-03-28 2011-09-14 北京鑫实路桥建设有限公司 Reverse circulation grouting anchor rod reinforcing method for road rock side slope
CN102251660A (en) * 2011-04-27 2011-11-23 湖南科技大学 Self-blocking anchorage piece for fixing cast-in-place concrete inner die and construction process
CN103205967A (en) * 2013-03-14 2013-07-17 张强 Anti-floating anchor rod structure of raft board
CN103603379A (en) * 2013-12-03 2014-02-26 葛建 Anti-floating system combining anti-floating cement soil pile and anti-floating anchor rod and construction process of anti-floating system
CN103774664A (en) * 2014-02-19 2014-05-07 深圳大学建筑设计研究院 Waterproof structure of basement anti-floating steel anchor rope and construction method
CN103774663A (en) * 2014-02-19 2014-05-07 深圳大学建筑设计研究院 Waterproof structure and construction method of basement anti-floating anchor bar
CN103924589A (en) * 2014-03-14 2014-07-16 苏州市能工基础工程有限责任公司 Prestressed anti-floating anchor bolt and construction method thereof
CN104131560A (en) * 2013-10-21 2014-11-05 中国建筑第四工程局有限公司 Anti-floating anchor and construction method thereof
CN104372793A (en) * 2014-11-07 2015-02-25 岩土科技股份有限公司 Anti-floating method used for existing basement by adopting pre-stressed anchor cables in jet grouting pile method
CN105178328A (en) * 2015-07-30 2015-12-23 葛加君 High-pressure jet grouting expansion hot-melting anchor bolt foundation pit supporting method
CN105292828A (en) * 2015-10-21 2016-02-03 中国石油化工股份有限公司 Tank bottom plate structure of large storage tank
CN105756059A (en) * 2016-04-29 2016-07-13 武汉建工集团股份有限公司 Back anchor type anti-floating anchor and construction method
CN105951823A (en) * 2016-03-29 2016-09-21 中铁时代建筑设计院有限公司 Soft soil foundation treatment and construction method by using mixing pile and anti-floating anchor rod
CN106661854A (en) * 2015-05-26 2017-05-10 上江洲正直 Anchor pile and installation method for same
CN107012865A (en) * 2017-03-31 2017-08-04 中国二十冶集团有限公司 The construction method of the anti-collapse hole of anchor pole
CN108370770A (en) * 2017-11-22 2018-08-07 石城县松湖养殖专业合作社 A kind of red bayberry planting greenhouse
CN110219300A (en) * 2019-05-27 2019-09-10 北京建材地质工程有限公司 The construction technology of part adhesive prepared pulling-resistant anchor rod
CN111042843A (en) * 2019-12-16 2020-04-21 中铁十四局集团大盾构工程有限公司 Pre-anchoring method for underground excavated tunnel
CN111975981A (en) * 2020-07-28 2020-11-24 南京钜力智能制造技术研究院有限公司 Prefabricated part, and tensioning device and tensioning method for end part of prefabricated part

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101892666A (en) * 2010-07-13 2010-11-24 张家港固耐特围栏系统有限公司 Ground pile for installing stand column
CN101914915A (en) * 2010-07-24 2010-12-15 烟台市工程勘察有限公司 Construction method for anti-floating anchor rod and special long auger
CN102182196A (en) * 2011-03-28 2011-09-14 北京鑫实路桥建设有限公司 Reverse circulation grouting anchor rod reinforcing method for road rock side slope
CN102251660A (en) * 2011-04-27 2011-11-23 湖南科技大学 Self-blocking anchorage piece for fixing cast-in-place concrete inner die and construction process
CN102251660B (en) * 2011-04-27 2012-12-12 湖南科技大学 Self-blocking anchorage piece for fixing cast-in-place concrete inner die and construction process
CN103205967B (en) * 2013-03-14 2015-02-25 中国建筑第八工程局有限公司 Anti-floating anchor rod structure of raft board
CN103205967A (en) * 2013-03-14 2013-07-17 张强 Anti-floating anchor rod structure of raft board
CN104131560A (en) * 2013-10-21 2014-11-05 中国建筑第四工程局有限公司 Anti-floating anchor and construction method thereof
CN103603379A (en) * 2013-12-03 2014-02-26 葛建 Anti-floating system combining anti-floating cement soil pile and anti-floating anchor rod and construction process of anti-floating system
CN103774663A (en) * 2014-02-19 2014-05-07 深圳大学建筑设计研究院 Waterproof structure and construction method of basement anti-floating anchor bar
CN103774664A (en) * 2014-02-19 2014-05-07 深圳大学建筑设计研究院 Waterproof structure of basement anti-floating steel anchor rope and construction method
CN103774664B (en) * 2014-02-19 2015-10-07 深圳大学建筑设计研究院 The water proof structure of basement anti-floating cable wire rope and construction method
CN103924589A (en) * 2014-03-14 2014-07-16 苏州市能工基础工程有限责任公司 Prestressed anti-floating anchor bolt and construction method thereof
CN103924589B (en) * 2014-03-14 2015-10-28 苏州市能工基础工程有限责任公司 prestressed anti-floating anchor rod and construction method thereof
CN104372793A (en) * 2014-11-07 2015-02-25 岩土科技股份有限公司 Anti-floating method used for existing basement by adopting pre-stressed anchor cables in jet grouting pile method
CN106661854A (en) * 2015-05-26 2017-05-10 上江洲正直 Anchor pile and installation method for same
CN106661854B (en) * 2015-05-26 2019-05-31 上江洲正直 Anchoring pile and its setting method
CN105178328A (en) * 2015-07-30 2015-12-23 葛加君 High-pressure jet grouting expansion hot-melting anchor bolt foundation pit supporting method
CN105292828A (en) * 2015-10-21 2016-02-03 中国石油化工股份有限公司 Tank bottom plate structure of large storage tank
CN105951823A (en) * 2016-03-29 2016-09-21 中铁时代建筑设计院有限公司 Soft soil foundation treatment and construction method by using mixing pile and anti-floating anchor rod
CN105756059A (en) * 2016-04-29 2016-07-13 武汉建工集团股份有限公司 Back anchor type anti-floating anchor and construction method
CN105756059B (en) * 2016-04-29 2017-11-03 武汉建工集团股份有限公司 A kind of rear anchor formula anti-float anchor rod and construction method
CN107012865A (en) * 2017-03-31 2017-08-04 中国二十冶集团有限公司 The construction method of the anti-collapse hole of anchor pole
CN108370770A (en) * 2017-11-22 2018-08-07 石城县松湖养殖专业合作社 A kind of red bayberry planting greenhouse
CN108370770B (en) * 2017-11-22 2020-07-31 石城县松湖养殖专业合作社 Red bayberry planting greenhouse
CN110219300A (en) * 2019-05-27 2019-09-10 北京建材地质工程有限公司 The construction technology of part adhesive prepared pulling-resistant anchor rod
CN111042843A (en) * 2019-12-16 2020-04-21 中铁十四局集团大盾构工程有限公司 Pre-anchoring method for underground excavated tunnel
CN111975981A (en) * 2020-07-28 2020-11-24 南京钜力智能制造技术研究院有限公司 Prefabricated part, and tensioning device and tensioning method for end part of prefabricated part

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