CN102776881B - Recyclable post-tensioned prestressing anchor cable pile and construction method thereof - Google Patents
Recyclable post-tensioned prestressing anchor cable pile and construction method thereof Download PDFInfo
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- CN102776881B CN102776881B CN201210290137.6A CN201210290137A CN102776881B CN 102776881 B CN102776881 B CN 102776881B CN 201210290137 A CN201210290137 A CN 201210290137A CN 102776881 B CN102776881 B CN 102776881B
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- anchor cable
- drill bit
- drilling rod
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Abstract
The invention discloses a recyclable post-tensioned prestressing anchor cable pile and a construction method thereof. The recyclable post-tensioned prestressing anchor cable pile is characterized by comprising a cement composite earth pile body and an anchor cable stretching into the pile body, wherein one end of the anchor cable, which stretches into the pile body, is connected with a drill. The construction method comprises the steps of assembling and positioning; grouting and retreating a rod; tensioning and locking; and recycling. According to the invention, the construction method of the general recyclable post-tensioned prestressing anchor cable pile is improved, and the steps of placing the anchor cable and grouting are combined into one step, thereby reducing construction steps and improving work efficiency; cement slurry and earth body are mixed and stirred; and the consumption of materials is reduced while construction quality is ensured.
Description
Technical field
The present invention relates to the bracing of foundation pit technical field in building operations, particularly relate to a kind of be applicable to go along with sb. to guard him temporarily in recyclable post-stressed anchored pile and construction method.
Background technology
Present stage, in highway, railway, urban architecture, prestressed anchor reinforcement technology is generally adopted to building deep foundation, underground concealed engineering, geotechnical engineering slope treatment.
But along with the development of society, urban built-up land is more and more nervous, foundation depth also strengthens thereupon, the construction that anchor cable intrusion building line affects next architectural planning land used is more and more serious, go along with sb. to guard him that the disposable input of facility stream line is not recyclable again causes the great wasting of resources temporarily simultaneously, therefore a large amount of researcher is at Foreign Experience, and experimental study has gone out recoverable prestressed anchor cable.Existing recoverable prestressed anchored pile is all adopt step-by-step construction, and the step such as pore-forming, placement anchor cable, grouting, anchor cable locking, recovery anchor cable, has the shortcoming such as complicated operation, long construction period.
Summary of the invention
The invention provides a kind of recyclable post-stressed anchored pile and construction method thereof, there is the advantage such as quick construction, convenience, solve the shortcoming of common recoverable prestressed anchor cable construction complexity, long construction period.
A kind of recyclable post-stressed anchored pile, comprise cementitious composite soil pile body and the anchor cable going deep into pile body, one end that anchor cable gos deep into pile body is connected with drill bit.
Anchor cable one end is connected with drill bit by safe pin, and the other end is connected with the counter-force that tensioning anchor cable and the native pile body termination of cementitious composite offset and buckles, and wherein the native pile body of cementitious composite also comprises other space enclosing structure pile bodies, and counter-force button is also referred to as anchor head; Described safe pin is connected with drill bit knot that can be undone by a pull, when drill bit rotational, safe pin can ensure that anchor cable does not follow drill bit rotational, and safe pin is also a kind of release unit simultaneously, the threshold of its breaking releasing, a suitable scope, can ensure that anchor cable comes off smoothly.
Drill bit is connected with drilling rod knot that can be undone by a pull, is rotated go deep into the soil body by rig.
Drill bit bottom surface is provided with draw-in groove; Drilling rod is stock shape, and two ends have the through hole interconnected, and cross section is annular, and one end and draw-in groove are connected together; The outer wall of two ends of drill respectively has several openings gunniting hole outwardly and injected hole, gunniting hole is communicated with injected hole.The passage be communicated with is not connected with through hole.
Before construction, drill bit and drilling rod are connected together; In construction, drilling rod needs to head on bit and advances; When moving back bar, only drilling rod need be retreated, drill bit just can be made to be separated with drilling rod.
Anchor cable is steel strand cable, also can be nonmetal high-strength carbon fiber drag-line.
A construction method for recyclable post-stressed anchored pile, construction sequence is as follows:
1), assembling and location
Described anchor cable, through the through hole on drilling rod, is connected with drill bit knot that can be undone by a pull by safe pin, and during guarantee drill bit rotational, anchor cable does not rotate; Drilling rod is connected with drill bit knot that can be undone by a pull, ensures that drilling rod can be separated with drill bit; By designing requirement with certain angle, drill bit is aimed at the position needing piling;
2), slip casting and move back bar
Rig rotarily drives drill bit by drilling rod and gos deep into the soil body, and in the process of rotation, from the injected hole of drilling rod, inject cement paste, cement paste sprays from gunniting hole, mixes with the soil body, forms cementitious composite soil pile body; After drill bit gos deep into desired depth, drilling rod is separated with drill bit, and pile body is exited on reversion limit, drilling rod limit, and drill bit and anchor cable are then stayed in pile body.
3), stretching and locking
When cementitious composite soil condenses into one with anchor cable, carry out stretch-draw to anchor cable, the pulling force of stretch-draw is less than the threshold of safe pin fracture; After stretching force reaches designing requirement, determine anchor cable by counter-force padlock, prevent anchor cable from retracting;
4), reclaim
After bracing engineering completes mission, carry out stretch-draw recovery to anchor cable, stretch-draw pulling force is greater than the threshold of safe pin fracture and the frictional resistance between anchor cable top layer and cementitious composite soil, and anchor cable and safe pin depart from, and extract out after reclaiming reusable.
Drilling rod is connected with drill bit knot that can be undone by a pull, and except being connected together, can also be threaded, during work, rig rotates according to a direction, and when moving back bar, drilling rod rotates in the opposite direction and is separated with drill bit, exits pile body along anchor cable; While exiting pile body, ejection cement paste is continued on reverse rotation limit, drilling rod limit, and fully mix cement slurry and the soil body, ensures the intensity of cementitious composite soil pile body.
The construction method of the present invention to general recoverable prestressed anchored pile is improved, and makes placement anchor cable, slip casting two steps merge into a step, save working procedure, improve operating efficiency, cement paste and soil body mix and blend, while guarantee construction quality, reduce material consumption.
Accompanying drawing explanation
Structural representation when Fig. 1 is recyclable post-stressed anchored pile construction in the invention process row 1;
Fig. 2 is the structural representation of drill bit in the invention process row 1;
Fig. 3 be in Fig. 2 A to structural representation;
Fig. 4 is the structural representation of recyclable post-stressed anchored pile in the invention process row 1.
Detailed description of the invention
Embodiment 1
As Figure 1-4, a kind of recyclable post-stressed anchored pile, comprise cementitious composite soil pile body 1 and the anchor cable 2 going deep into pile body, anchor cable 2 one end is connected with the drill bit 4 going deep into the soil body by safe pin 3, and the other end is connected with tensioning anchor cable 2 and buckles 5 with the counter-force that cementitious composite soil pile body 1 termination offsets; Safe pin 3 is connected with drill bit 4 knot that can be undone by a pull, ensure drill bit turn into time, anchor cable does not follow drill bit rotational.
Anchor cable 2 adopts steel strand cable, also can be nonmetal high-strength carbon fiber drag-line.
Drill bit 4 can cutting soil, is connected with drilling rod 6 knot that can be undone by a pull, is rotated go deep into the soil body by rig.Drilling rod 6 is stock shape, and two ends have the through hole 8 interconnected, and cross section is annular; The outer wall at drilling rod 6 two ends respectively has several gunniting hole 9 and injected holes, gunniting hole 9 is communicated with injected hole, and the passage of connection is not connected with through hole 8.
Drill bit 4 is provided with draw-in groove 7 with the safe unidirectional bottom surface of pin 3, and drilling rod 6 connects one end of drill bit 4 and draw-in groove 7 is connected together, and during work, drilling rod 6 heads on drill bit 4 and rotates according to a direction, and when moving back bar, drilling rod 6 retreats and is separated with drill bit 4; The bottom surface of certain drill bit 4 also can adopt with drilling rod 6 and be threaded, and according to being threaded, drilling rod rotates in the opposite direction and is separated with drill bit 4; After separation, drilling rod 6 is while anchor cable 2 exits pile body, and ejection cement paste is continued on reverse rotation limit, limit, and fully mix cement slurry and the soil body, ensures the intensity of cementitious composite soil pile body.
The construction method of this kind of recyclable post-stressed anchored pile comprises the steps:
1), assembling and location
Anchor cable 2, through the through hole 8 on drilling rod 6, is connected with drill bit 4 knot that can be undone by a pull by safe pin 3, and ensure that anchor cable 2 can not rotate while drill bit 4 rotates, drilling rod 6 and drill bit 4 are connected together, and needs to ensure that drilling rod 6 is not separated with drill bit 4 during punching; By designing requirement with certain angle, drill bit 4 is aimed at the position needing piling;
2), slip casting and move back bar
Rig rotarily drives drill bit 4 by drilling rod 6 and gos deep into the soil body, in the process of rotation, injects cement paste by slurry filling machine from the injected hole of drilling rod 6, cement paste sprays from gunniting hole 9, mix with the soil body, form cementitious composite soil pile body, during slip casting, through hole protection anchor cable 2 does not corrode by cement paste; After drill bit 4 gos deep into desired depth, drilling rod 6 retreats and is separated with drill bit 4, and pile body is exited on reversion limit, drilling rod 6 limit, and drill bit 4 and anchor cable 2 are stayed in pile body;
3), stretching and locking
When cementitious composite soil condenses into one with anchor cable 2, apply pulling force by electronic puller system to anchor cable 2, use anchor cable tensiometer to measure pulling force simultaneously, the pulling force of stretch-draw is less than the threshold of safe pin 3 fracture; After stretching force reaches designing requirement, lock anchor cable 2 by counter-force button 5, while preventing anchor cable 2 from retracting, play again the effect of the fixing periphery soil body, prevent from caving in;
4), reclaim
After anchored pile meets designing requirement, sealing off and covering anchorage, blocks outer for pile body unnecessary anchor cable 2, repeats the construction that above step completes other anchored piles; After bracing engineering completes mission, by electronic puller system, stretch-draw recovery is carried out to anchor cable 2, stretch-draw pulling force is greater than the threshold of safe pin 3 fracture and the frictional resistance between anchor cable 2 top layer and cementitious composite soil, and anchor cable 2 and safe pin 3 depart from, and extract out after reclaiming reusable.
Claims (3)
1. a recyclable post-stressed anchored pile, comprise cementitious composite soil pile body (1) and go deep into the anchor cable (2) of pile body, it is characterized in that: one end that described anchor cable (2) gos deep into pile body is connected with drill bit (4);
Described anchor cable (2) one end is connected with drill bit (4) by safe pin (3), and the other end is connected with tensioning anchor cable (2) and buckles (5) with the counter-force that cementitious composite soil pile body (1) termination offsets; Described safe pin (3) is connected with drill bit (4) knot that can be undone by a pull;
Described drill bit (4) is connected with drilling rod (6) knot that can be undone by a pull, is rotated go deep into the soil body by rig.
2. recyclable post-stressed anchored pile according to claim 1, is characterized in that: described drill bit (4) bottom surface is provided with draw-in groove (7); Drilling rod (6) is stock shape, and two ends have the through hole (8) interconnected, and cross section is annular, and one end and draw-in groove (7) are connected together; The outer wall at drilling rod (6) two ends respectively has several openings gunniting hole outwardly (9) and injected hole, gunniting hole (9) is communicated with injected hole.
3. a construction method for recyclable post-stressed anchored pile described in claim 1, is characterized in that:
Construction sequence is as follows:
1), assembling and location
Described anchor cable (2), through the through hole (8) on drilling rod (6), is connected with drill bit (4) knot that can be undone by a pull by safe pin (3), and drilling rod (6) is connected with drill bit (4) knot that can be undone by a pull; By designing requirement with certain angle, drill bit (4) is aimed at the position needing piling;
2), slip casting and move back bar
Rig rotarily drives drill bit (4) by drilling rod (6) and gos deep into the soil body, in the process of rotating, from the injected hole of drilling rod (6), inject cement paste, cement paste sprays from gunniting hole (9), mix with the soil body, form cementitious composite soil pile body; After drill bit gos deep into desired depth, drilling rod (6) is separated with drill bit (4), and pile body is exited on reversion limit, drilling rod (6) limit, and drill bit (4) and anchor cable (2) are stayed in pile body;
3), stretching and locking
When cementitious composite soil condenses into one with anchor cable (2), carry out stretch-draw to anchor cable (2), the pulling force of stretch-draw is less than the threshold that safe pin (3) ruptures; After stretching force reaches designing requirement, by counter-force button (5) locking anchor cable (2), prevent anchor cable (2) from retracting;
4), reclaim
After bracing engineering completes mission, stretch-draw recovery is carried out to anchor cable (2), stretch-draw pulling force is greater than threshold that safe pin (3) ruptures and the frictional resistance between anchor cable (2) top layer and cementitious composite soil, anchor cable (2) and safe pin (3) depart from, reusable after extracting out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210290137.6A CN102776881B (en) | 2012-08-13 | 2012-08-13 | Recyclable post-tensioned prestressing anchor cable pile and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210290137.6A CN102776881B (en) | 2012-08-13 | 2012-08-13 | Recyclable post-tensioned prestressing anchor cable pile and construction method thereof |
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| Publication Number | Publication Date |
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| CN102776881A CN102776881A (en) | 2012-11-14 |
| CN102776881B true CN102776881B (en) | 2015-02-25 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215953A (en) * | 2013-04-24 | 2013-07-24 | 启东建筑集团有限公司 | Construction method of anti-floating anchor in super-large super-deep basement engineering |
| CN103924591B (en) * | 2014-04-16 | 2016-08-31 | 中铁第四勘察设计院集团有限公司 | A kind of method for designing of tension type anchor cable |
| CN107989063A (en) * | 2017-12-01 | 2018-05-04 | 绍兴大明电力设计院有限公司 | Churning anchor cable composite foundation |
| CN113585239A (en) * | 2021-09-02 | 2021-11-02 | 中庆建设有限责任公司 | Prestressed anchor pile |
| CN114183180A (en) * | 2021-12-17 | 2022-03-15 | 辽宁有色勘察研究院有限责任公司 | Down-placing tool and down-placing method for deep hole cross-fault Newton force NPR anchor cable |
| CN115419076A (en) * | 2022-05-30 | 2022-12-02 | 中冶建工集团有限公司 | Construction method for high-pressure rotary spraying recoverable anchor cable support of deep foundation pit |
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| GB2206613A (en) * | 1987-07-08 | 1989-01-11 | Zuei Jse Lin | Recoverable ground anchor |
| CN2813873Y (en) * | 2005-06-22 | 2006-09-06 | 叶迎新 | Drilling rod of central placing roofbolt driller |
| CN2926509Y (en) * | 2006-05-09 | 2007-07-25 | 中国矿业大学 | Roofbolt support |
| CN2934357Y (en) * | 2006-07-26 | 2007-08-15 | 中冶沈勘工程技术有限公司 | Butt-jointing device for anchor cable and borer |
| CN200964592Y (en) * | 2006-11-01 | 2007-10-24 | 中国人民解放军总参谋部工程兵科研三所 | Recoverable prestressed anchor |
| CN202706022U (en) * | 2012-08-13 | 2013-01-30 | 杭州南联地基基础工程有限公司 | Recycled post-tensioned prestressing anchor cable pile |
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- 2012-08-13 CN CN201210290137.6A patent/CN102776881B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2206613A (en) * | 1987-07-08 | 1989-01-11 | Zuei Jse Lin | Recoverable ground anchor |
| CN2813873Y (en) * | 2005-06-22 | 2006-09-06 | 叶迎新 | Drilling rod of central placing roofbolt driller |
| CN2926509Y (en) * | 2006-05-09 | 2007-07-25 | 中国矿业大学 | Roofbolt support |
| CN2934357Y (en) * | 2006-07-26 | 2007-08-15 | 中冶沈勘工程技术有限公司 | Butt-jointing device for anchor cable and borer |
| CN200964592Y (en) * | 2006-11-01 | 2007-10-24 | 中国人民解放军总参谋部工程兵科研三所 | Recoverable prestressed anchor |
| CN202706022U (en) * | 2012-08-13 | 2013-01-30 | 杭州南联地基基础工程有限公司 | Recycled post-tensioned prestressing anchor cable pile |
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| CN102776881A (en) | 2012-11-14 |
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Denomination of invention: Recyclable post-tensioned prestressing anchor cable pile and construction method thereof Effective date of registration: 20181017 Granted publication date: 20150225 Pledgee: Hangzhou joint rural commercial bank Limited by Share Ltd three pier sub branch Pledgor: Yan Ping|Hangzhou Nanlian Base Foundation Engineering Co., Ltd. Registration number: 2018330000314 |