CN103290843A - Pre-stressed pressure-type anti-floating anchor with spiral stirrup - Google Patents
Pre-stressed pressure-type anti-floating anchor with spiral stirrup Download PDFInfo
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- CN103290843A CN103290843A CN2013102193682A CN201310219368A CN103290843A CN 103290843 A CN103290843 A CN 103290843A CN 2013102193682 A CN2013102193682 A CN 2013102193682A CN 201310219368 A CN201310219368 A CN 201310219368A CN 103290843 A CN103290843 A CN 103290843A
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- spiral stirrup
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Abstract
The invention relates to a pre-stressed pressure-type anti-floating anchor with a spiral stirrup. The pre-stressed pressure-type anti-floating anchor comprises an anchor head, a free segment and an anchorage segment. The free segment is of a steel bar rod, a corrugated pipe is sleeved onto the outside of the steel bar rod, and the spiral stirrup is arranged on the outer side of the corrugated pipe. Cement paste or cement mortar is filled between the corrugated pipe and an anchor hole, and wraps the spiral stirrup to form an anchor body. One end of the free segment, extending to the inside of the anchor hole, is provided with the anchor segment which comprises a bearing plate and an anchorage device, the bearing plate is abutted against one end of the spiral stirrup, and the anchor segment is anchored on the outer side of the bearing plate through the anchorage device. The anchor head is arranged on the other end of the free segment, and comprises a lock and a steel plate, the steel plate is abutted against the other end of the spiral stirrup, and the anchor head is locked by the lock on the outside of the steel plate after steel bar rod pre-stress of the free segment is extended and pulled. The steel plate covers on a structural waterproof layer, so that the pre-stress pressure exists in the anchor body before being borne. By the aid of the anti-floating anchor, the problem of cracks and water seepage is effectively solved.
Description
Technical field
The present invention relates to a kind of prestressed pressure type anti-float anchor rod with spiral stirrup, belong to building underground structure anti-float anchor rod field.
Background technology
For the ground anchorage technology, its application and research have had the history in more than 100 year.Its application has also expanded to many territories, reinforces pattern foundation pit supporting structure and tunnel support etc. as mining, coal mine roadway.Since nearly 2 years, along with the raising of urban underground space utilization rate, embedded depth of foundation is more and more darker, and it is increasing that particularly the phreatic degree of depth is immersed on the basis, and it also is increasing that the probability that pulls out load is born in the building foundation.In practical project, for the condition of the stress balance that satisfies the basis, some major measure that adopt have structure weightening finish method, fall the measure that cuts drainage, uplift pile method and anti-float anchor rod method etc. at present.Yet still there are many defectives in actual applications in these measures.Can to be underground structure reach balance with buoyancy by the weight that increases self to structure weightening finish method, this kind measure process economics cost is also relatively low, but generally can only use the lower situation of groundwater table, not too suitable for present tall and big dark underground anti-floating situation.Fall and cut the construction requirement that drainage generally also can only use short-term, just not too suitable for long-term requirement, and long-term groundwater abstraction, also be influential for the safety of the adjacent building of periphery.The extensive point of scope of application meeting of this measure of uplift pile, but its cost height, the requirement height of construction, and also the structure bottom slab stress is inhomogeneous.Compare, anti-float anchor rod is wherein most widely used a kind of measure of anti float.Because low, duration of this technology cost is short, easy construction, the most important thing is advantages such as the stressed distribution of sole plate is comparatively even, so use comparatively extensive.But during use, structure percolation-proof problem is a puzzlement researcher and engineers and technicians' a difficult problem always after the endurance issues of anti-float anchor rod and the anti-float anchor rod anchoring.For example, its range of application of total length bonding anti-float anchor rod is very widely, but because anchoring body and the downward frictional resistance effect of ground body on every side, make and produced tensile stress in the anchoring body, when tensile stress surpasses the tension ultimate stress of anchoring body, the crack will be produced, and can expansion can be continued along with the time crack.When the crack arrived reinforcing bar position, underground water will infiltrate, and then corrosion reinforcing bar, has influence on ultimate bearing capacity and the durability of anchor pole.So endurance issues of total length bonding anti-float anchor rod one " time bomb " being equivalent to bury generally speaking.And for the load transfer mechanism of anti-float anchor rod, many scholars have carried out deep research, distribute by power function along anchorage length as Phillips supposition frictional resistance, have provided the relevant parameter that is applicable to rock bolt.But up to the present, in the existing technical standard of country or industry, the design of anti-float anchor rod etc. is planless regulation still, and fails to provide and design relevant anchor pole construction measure.In practical engineering design, even if same engineering if designed by different personnel, also can obtain different design results.In actual the examination, we also still adopt the method for field trial that anchor pole is carried out inspection of quality and sampling observation.
Summary of the invention
The present invention is directed to the deficiency of above-mentioned non-prestressed total length bonding tension type anti-float anchor rod, a kind of prestressed pressure type anti-float anchor rod with spiral stirrup has been proposed, it is on the basis of non-prestressed total length bonding tension type anti-float anchor rod power transmission principle, by put the compressive pre-stress effect that bellows is arranged to the free section of total length and is applied fair-sized to anchoring body in advance at the body of rod, and adopt the measure of disposing spiral stirrup, improve the endurance quality of anti-float anchor rod; The construction measure that the position of anchor head is arranged on the waterproofing course solves structure base plate percolation-proof problem in addition.
The technical solution used in the present invention is specific as follows:
A kind of prestressed pressure type anti-float anchor rod with spiral stirrup, it is characterized in that: described anti-float anchor rod comprises anchor head, free section and anchoring section, wherein, described free section is a reinforcing bar body of rod, the external face of described reinforcement rod is with bellows, bellows outside is provided with spiral stirrup, is filled with cement paste or cement mortar between described bellows and the anchor hole, thereby it wraps spiral stirrup and forms an anchoring body; The free section that is arranged at described anchoring section stretches into the end in the anchor hole, and it comprises bearing plate and ground tackle, and described bearing plate props up spiral stirrup one end, and by ground tackle anchoring outside bearing plate; Described anchor head is arranged at the free section other end, comprise lockset and steel plate, described steel plate also is a bearing plate, it props up the other end of spiral stirrup, lockset by the steel plate outside behind the described free section reinforcing bar body of rod prestressed stretch-draw is locked, and described sheet-steel cover is on the waterproofing course of structure, makes to have compressive pre-stress before the described anchoring body carrying.
Further, the described free segment length length that is anchoring body;
Further, be provided with the rubber waterproof sealing mat between the lockset of described anchor head and the steel plate, perhaps the screw thread at lockset is wound with the polytetrafluoroethylene (PTFE) strip.
Further, the described reinforcing bar body of rod stretches out anchor head outward and bends and is arranged in the structure base plate.
Further, comprise waterproofing course, 100mm concrete cushion and soil layer successively under the described structure base plate.
Further, described anchor hole passes waterproofing course, 100mm concrete cushion and soil layer successively.
Further, be marked with grease in the described free section bellows.
Perhaps the reinforcing bar body of rod in the described free section can be replaced with non-bending steel cable.
The present invention is after anti-float anchor rod anchoring body intensity reaches before anti-float anchor rod carrying, anti-float anchor rod is carried out prestressed stretch-draw in advance, and by prestressing force the concrete ground tackle is locked, make and before the anchoring body carrying, wherein just have compressive pre-stress, in the whole bearing capacity process of anti-float anchor rod, all has only compressive stress in the anchoring body so always, be in pressured state, guaranteed that concrete can not produce the crack because of tension, well solve the problem of the durability of total length bonding anchor pole, but also can give full play to the ultimate bearing capacity of anti-float anchor rod.We increase the steel plate that thickness is suitable with anchor head in addition, and this bearing plate covered on waterproofing course, when we apply waterproofing course below bearing plate can be pushed down prestressed the time to anti-float anchor rod, so just can solve the problem of structure base plate percolation-proof.In addition from construction measure, can between the lockset of anchor head and the steel plate the good valve rubber of property sealing together is set and before the lockset locking earlier screw thread with polytetrafluoroethylene (PTFE) strip volume on several circles and then lockset locked.
In prestressed pressure type anti-float anchor rod, dispose spiral stirrup, can effectively improve the value of thrust in the anchor pole stretching process, thereby improve the compressive pre-stress value in the anchoring body greatly, this kind anti-float anchor rod is applied in the darker underground structure anti-floating of phreatic high and buried depth in a wider context.
Band spiral stirrup prestressed pressure type anti-float anchor rod spy on tension type anti-float anchor rod power transmission principle, the crack developing that effectively limits anchor pole anchoring body in load bearing process by the such application of force of prestressed anchor and spiral stirrup and constraint acting in conjunction; By steel plate being set at anchor head and the anchor head branch being arranged at the seepage problem that solves the structure base plate on the waterproofing course.
Beneficial effect
The prestressed pressure type anti-float anchor rod of band spiral stirrup of the present invention is on the basis of tension type anti-float anchor rod power transmission principle, apply the compressive pre-stress effect of fair-sized in advance for anchoring body, and by outside the body of rod of anchoring body, disposing the measure of spiral stirrup, the initial stress that has had a certain size before anchoring body is carried, supporting capacity improves, crack and anti-float anchor rod excellent in durability do not appear in anchoring body substantially, in addition, by setting up a block plate at anchor head and the anchor head branch being arranged on the waterproofing course, can effectively solve the problem of the percolation-proof of structure base plate, be applicable to the groundwater condition needs of various water levels.
Description of drawings
The prestressed pressure type anti-float anchor rod functional schematic of Fig. 1 band spiral stirrup of the present invention;
The prestressed pressure type anti-float anchor rod structure schematic diagram of structure of Fig. 2 band spiral stirrup of the present invention;
Fig. 3 is that the anchor head functional configuration of Fig. 2 amplifies organigram, and it arranges a block plate and the anchor head branch is arranged on the waterproofing course at the anchor head branch.
Wherein, 1-structure base plate; 2-waterproofing course; 3-100mm concrete cushion; 4-soil layer; The prestressed pressure type anti-float anchor rod of 5-band spiral stirrup; 6-reinforcing bar body of rod; 7-lockset; 8-spiral stirrup; 9-ground tackle; 10-steel plate; 11-bellows; 12-rubber waterproof sealing mat.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing 1-3.
As described in Fig. 1-3, a kind of prestressed pressure type anti-float anchor rod 5 with spiral stirrup of the present invention, comprise anchor head, free section and anchoring section, wherein, free section is a reinforcing bar body of rod 6, its outside is with bellows 11, be marked with grease in the free section bellows 11, bellows 11 outsides are provided with spiral stirrup 8, are filled with cement paste or cement mortar between bellows 11 and the anchor hole, thereby it wraps spiral stirrup 8 and forms an anchoring body, and free segment length is the length of anchoring body; The free section that is arranged at anchoring section stretches into the end in the anchor hole, and it comprises bearing plate and ground tackle 9, and bearing plate props up spiral stirrup 8 one ends, and by ground tackle 9 anchoring outside bearing plate; Anchor head is arranged at the free section other end, comprise lockset 7 and steel plate 10, steel plate 10 also is a bearing plate, it props up the other end of spiral stirrup 8, lockset 7 by steel plate 10 outsides behind the free section reinforcing bar body of rod 6 prestressed stretch-draws is locked, and steel plate 10 covers on the waterproofing course 2 of structure, makes to have compressive pre-stress before the carrying of described anchoring body; The reinforcing bar body of rod 6 stretches out the outer also bending of anchor head and is arranged in the structure base plate 1.The structure base plate comprises waterproofing course 2,100mm concrete cushion 3 and soil layer 4 for 1 time successively, and anchor hole passes waterproofing course 2,100mm concrete cushion 3 and soil layer 4 successively.Wherein, in order to play the effect of water-tight, also be provided with rubber waterproof sealing mat 12 between the lockset 7 of anchor head and the steel plate 10, perhaps the screw thread at lockset 7 is wound with the polytetrafluoroethylene (PTFE) strip, can be before lockset locking earlier screw thread with polytetrafluoroethylene (PTFE) strip volume on several circles and then lockset locked.
Perhaps the reinforcing bar body of rod 6 in the above-mentioned free section can be replaced with non-bending steel cable.
More than be an exemplary embodiments of the present invention, enforcement of the present invention is not limited thereto.
Claims (8)
1. prestressed pressure type anti-float anchor rod (5) with spiral stirrup, it is characterized in that: described anti-float anchor rod comprises anchor head, free section and anchoring section, wherein, described free section is a reinforcing bar body of rod (6), the described reinforcing bar body of rod (6) outside is with bellows (11), bellows (11) outside is provided with spiral stirrup (8), is filled with cement paste or cement mortar between described bellows (11) and the anchor hole, and it wraps spiral stirrup (8) thereby forms an anchoring body; The free section that is arranged at described anchoring section stretches into the end in the anchor hole, and it comprises bearing plate and ground tackle (9), and described bearing plate props up spiral stirrup (8) one ends, and by ground tackle (9) anchoring outside bearing plate; Described anchor head is arranged at the free section other end, comprise lockset (7) and steel plate (10), described steel plate (10) also is a bearing plate, it props up the other end of spiral stirrup (8), lockset (7) by steel plate (10) outside behind the described free section reinforcing bar body of rod (6) prestressed stretch-draw is locked, and described steel plate (10) covers on the waterproofing course (2) in structure, makes to have compressive pre-stress before the described anchoring body carrying.
2. the prestressed pressure type anti-float anchor rod (5) of band spiral stirrup according to claim 1, it is characterized in that: described free segment length is the length of anchoring body.
3. the prestressed pressure type anti-float anchor rod (5) of band spiral stirrup according to claim 1, it is characterized in that: be provided with rubber waterproof sealing mat (12) between the lockset of described anchor head (7) and the steel plate (10), perhaps the screw thread at lockset (7) is wound with the polytetrafluoroethylene (PTFE) strip.
4. the prestressed pressure type anti-float anchor rod (5) of band spiral stirrup according to claim 1 is characterized in that: the described reinforcing bar body of rod (6) stretches out the outer and bending of anchor head and is arranged in the structure base plate (1).
5. the prestressed pressure type anti-float anchor rod (5) of band spiral stirrup according to claim 4 is characterized in that: comprise waterproofing course (2), 100mm concrete cushion (3) and soil layer (4) under the described structure base plate (1) successively.
6. the prestressed pressure type anti-float anchor rod (5) of band spiral stirrup according to claim 5, it is characterized in that: described anchor hole passes waterproofing course (2), 100mm concrete cushion (3) and soil layer (4) successively.
7. the prestressed pressure type anti-float anchor rod (5) of band spiral stirrup according to claim 1 is characterized in that: be marked with grease in the described free section bellows (11).
8. according to the prestressed pressure type anti-float anchor rod (5) of the arbitrary described band spiral stirrup of claim 1-7, it is characterized in that: the reinforcing bar body of rod (6) in the described free section is replaced with non-bending steel cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102193682A CN103290843A (en) | 2013-06-04 | 2013-06-04 | Pre-stressed pressure-type anti-floating anchor with spiral stirrup |
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| CN2013102193682A CN103290843A (en) | 2013-06-04 | 2013-06-04 | Pre-stressed pressure-type anti-floating anchor with spiral stirrup |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044122A (en) * | 2017-05-22 | 2017-08-15 | 江苏景源万河环境科技有限公司 | A kind of engineering method for overcoming anti-floating fixed diameter anchor head or enlarged footing anchoring-bolt system to deform |
| CN108825615A (en) * | 2018-07-18 | 2018-11-16 | 中冶武汉冶金建筑研究院有限公司 | A kind of seamless bellows anchoring piece |
| CN109811804A (en) * | 2019-02-18 | 2019-05-28 | 深圳市工勘岩土技术有限公司 | Anchoring type prestressed anti-floating anchor rod construction method after pretensioning |
| WO2020168766A1 (en) * | 2019-02-18 | 2020-08-27 | 深圳市地质环境研究院有限公司 | Pre-tensioned post-anchored-type prestressed anti-floating anchor rod structure |
| CN115163149A (en) * | 2022-06-22 | 2022-10-11 | 保利长大工程有限公司 | Anti-floating anchor rod construction process based on tunnel engineering |
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| CN202298615U (en) * | 2011-08-24 | 2012-07-04 | 柳州欧维姆机械股份有限公司 | Electrical isolation protective anchor cable |
| CN103061345A (en) * | 2013-02-01 | 2013-04-24 | 中铁二院工程集团有限责任公司 | Pressure dispersion-type anchorage cable crushing prevention grouting bearing plate structure |
| CN203307803U (en) * | 2013-06-04 | 2013-11-27 | 中铁建设集团有限公司 | Pre-stress pressure type anti-floating anchor rod with spiral stirrup |
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2013
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| DE2201950B2 (en) * | 1972-01-15 | 1980-10-09 | Ed. Zueblin Ag, 7000 Stuttgart | Structural component anchorage for earth or rock - involves tension member comprising elastic and non-elastic steel parts |
| CN2389176Y (en) * | 1999-09-03 | 2000-07-26 | 柳州欧维姆建筑机械有限公司 | Sealed anchorage cable |
| CN2667007Y (en) * | 2003-07-24 | 2004-12-29 | 柳州欧维姆机械股份有限公司 | Multi-stage prestressed finished anchorage cable |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044122A (en) * | 2017-05-22 | 2017-08-15 | 江苏景源万河环境科技有限公司 | A kind of engineering method for overcoming anti-floating fixed diameter anchor head or enlarged footing anchoring-bolt system to deform |
| CN107044122B (en) * | 2017-05-22 | 2019-08-13 | 江苏景源万河环境科技有限公司 | A kind of engineering method for overcoming anti-floating fixed diameter anchor head or enlarged footing anchoring-bolt system to deform |
| CN108825615A (en) * | 2018-07-18 | 2018-11-16 | 中冶武汉冶金建筑研究院有限公司 | A kind of seamless bellows anchoring piece |
| CN109811804A (en) * | 2019-02-18 | 2019-05-28 | 深圳市工勘岩土技术有限公司 | Anchoring type prestressed anti-floating anchor rod construction method after pretensioning |
| WO2020168766A1 (en) * | 2019-02-18 | 2020-08-27 | 深圳市地质环境研究院有限公司 | Pre-tensioned post-anchored-type prestressed anti-floating anchor rod structure |
| WO2020168765A1 (en) * | 2019-02-18 | 2020-08-27 | 深圳市地质环境研究院有限公司 | Pre-tensioning and post-anchoring construction method for prestressed anti-floating anchor rod |
| CN115163149A (en) * | 2022-06-22 | 2022-10-11 | 保利长大工程有限公司 | Anti-floating anchor rod construction process based on tunnel engineering |
| CN115163149B (en) * | 2022-06-22 | 2023-04-21 | 保利长大工程有限公司 | Anti-floating anchor construction process based on tunnel engineering |
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Application publication date: 20130911 |