CN103334780B - A kind of swollen shell-type constant-resistance prestressed anchor - Google Patents
A kind of swollen shell-type constant-resistance prestressed anchor Download PDFInfo
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- CN103334780B CN103334780B CN201310299758.5A CN201310299758A CN103334780B CN 103334780 B CN103334780 B CN 103334780B CN 201310299758 A CN201310299758 A CN 201310299758A CN 103334780 B CN103334780 B CN 103334780B
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- swollen shell
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Abstract
The invention discloses a kind of swollen shell-type constant-resistance prestressed anchor, belong to Geotechnical Engineering field.Adopt and the swollen shell in anchorage head and cone core are improved, the internal face of swollen shell and the outside wall surface of cone core are provided with corresponding step constant-resistance boss, the step taper surface that the step taper surface that step constant-resistance boss on swollen shell is formed is formed with the step constant-resistance boss on cone core is slidably matched each other, swollen shell even inflation can be made, the setting of the step constant-resistance boss of swollen shell and cone core, the stretching degree of swollen shell can be limited and carry out spacing to swollen shell and the relative motion of cone core, and then limit the maximum anchored force of this swollen shell-type constant-resistance prestressed anchor, prevent anchor bar body from drawing bad, prevent the overall slippage of boring core, a kind of swollen shell-type constant-resistance prestressed anchor reasonable in design of the present invention, easy for installation.
Description
Technical field
The present invention relates to a kind of tunnel (road) or the swollen shell-type prestressed anchor of roadway support, particularly relate to a kind of swollen shell-type constant-resistance prestressed anchor, belong to Geotechnical Engineering field.
Background technology
Prestressed anchor supporting is a kind of support pattern common in the underground chamber constructions such as tunnel (road), underground power house.By applying prestressing force initiatively, prestressed anchor just can make anchorage zone country rock be in pressured state at the supporting initial stage, thus suppresses the distortion and fragmentation of country rock, makes it to reach stability and safety state.And prestressed anchor installation rate is fast, can after excavation Fast Installation, meet the requirement played a role in time.At present, the development of the field such as China's water power, the energy, traffic rapidly, increasing deep-lying tunnel (road), cavity group, storage vault or dispose repository are there is, these deep underground construction Environmental effect are severe, geostatic stress is high, owing to lacking effectively preventing measure particularly supporting control device, very easily break after excavation, peel off the heavily stressed disasters such as even rock burst, cause great property loss and casualties.Therefore, deep engineering also can resist the anchor system of percussion in the urgent need to a kind of can playing a role in time fast.Engineering practice shows, existing common prestressed anchor provides enough large prestressing force and these two conditions of constant anchored force simultaneously after being difficult to meet anchoring, be difficult to adapt to the percussion such as heavily stressed lower country rock failure by rupture and rock burst, cause anchor pole to be usually pulled off or the slippage of anchorage head tap web.
China Patent Publication No. CN1544798A, date of declaration on November 10th, 2004, denomination of invention " a kind of expansion sleeve bolt ", this application case is to disclosing a kind of expansion sleeve bolt, the front end of this anchor pole is grouted part, rear end is outer anchoring section, and the backing plate of anchor pole has connecting pipe close to anchor bar body place, is fixed in the both-side opening groove of wedge in swollen shell by tie at grouted part swollen shell intermediate plate.This prestressed anchor and the effective contact area of drill hole inner wall little, tie is easily pulled off, and cause the prestressing force that can apply little, swollen shell intermediate plate easily comes off.
China Patent Publication No. CN102808635A, date of declaration on December 5th, 2012, denomination of invention " a kind of swollen shell-type Inner bolt head prestressed anchor and installation and application thereof ", this application case discloses the installation and application of a kind of swollen shell-type Inner bolt head prestressed anchor and this anchor pole, and the Inner bolt head of this prestressed anchor comprises and has the swollen shell of cone-shaped through hole and the cone core of tapered shape.The cone core of this prestressed anchor and swollen shell can constantly increase generation relative displacement along with the distortion of country rock, cause anchored force constantly to increase, and finally cause anchor pole to break or bore core slippage.
Engineering practice shows, existing swollen shell-type prestressed anchor is difficult to limit the swollen shell of maximum anchored force and grouted part and the relative sliding of cone core, causes breaking or the slippage of anchoring nose cone core of anchor bar body.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide the swollen shell-type constant-resistance prestressed anchor that a kind of high pre-stress, constant-resistance, anchor structure are reasonable, easy for installation.
To achieve these goals, technical solution of the present invention is: a kind of swollen shell-type constant-resistance prestressed anchor, the body of rod comprising anchor pole is with the pallet being connected to body of rod upper end and locking nut and be connected to the cone core of body of rod lower end and be sleeved on the swollen shell of boring outside core, the internal face of described swollen shell is provided with step constant-resistance boss, the outside wall surface of cone core is provided with the step constant-resistance boss corresponding with the step constant-resistance boss that swollen shell is arranged, the step taper surface that the step taper surface that step constant-resistance boss on swollen shell is formed is formed with the step constant-resistance boss on cone core is slidably matched each other, step constant-resistance boss boss bottom on described cone core is positioned at 1/2 ~ 2/3 place of cone core length.
Owing to have employed above technical scheme, a kind of swollen shell-type constant-resistance prestressed anchor of the present invention, adopt and the swollen shell in anchorage head and cone core are improved, the internal face of swollen shell and the outside wall surface of cone core are provided with corresponding step constant-resistance boss, the step taper surface that the step taper surface that step constant-resistance boss on swollen shell is formed is formed with the step constant-resistance boss on cone core is slidably matched each other, swollen shell even inflation can be made, the setting of the step constant-resistance boss of swollen shell and cone core, the stretching degree of swollen shell can be limited and carry out spacing to swollen shell and the relative motion of cone core, and then limit the maximum anchored force of this swollen shell-type constant-resistance prestressed anchor, prevent anchor bar body from drawing bad, prevent the overall slippage of boring core,
The present invention is swollen, and shell-type constant-resistance prestressed anchor is reasonable in design, structure is simple, easy for installation, a certain size prestressing force can be provided, the initial deformation of restriction country rock and destruction, effectively can control the size of maximum anchored force, prevent anchor bar body to be pulled off, swollen shell and the maximum value of cone core relative sliding can be limited, prevent the overall slippage of boring core.
Accompanying drawing explanation
Fig. 1 is structure design schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail, sees accompanying drawing.
As shown in Figure 1, a kind of swollen shell-type constant-resistance prestressed anchor, it is by the body of rod 3, pallet 2, locking nut 1, cone core 5 and swollen shell 4 form, the internal face of swollen shell 4 is provided with step constant-resistance boss, wall has four grooves, groove width about 3mm, swollen shell 4 symmetry is divided into pintongs by groove, the outer wall of swollen shell 4 upper end has circle shape groove, groove and groove can make swollen shell even inflation, the conical section external surface of swollen shell 4 is scrobicula textured after embossing process, in order to increase the friction factor of swollen shell 4 and country rock, improve anchored force, , the outside wall surface of cone core 5 is provided with the step constant-resistance boss corresponding with the step constant-resistance boss that swollen shell 4 is arranged, step constant-resistance boss boss bottom on cone core 5 is positioned at 1/2 ~ 2/3 place of cone core 5 length, the step taper surface that the step taper surface that step constant-resistance boss on swollen shell 4 is formed is formed with the step constant-resistance boss on cone core 5 is slidably matched each other, cone core 5 internal face is provided with internal thread, cone core 5 activity be inserted in the bellmouth of swollen shell 4, the hypomere of cone core 5 is cylindric, the body of rod 3 grouted part arranges external screw thread, and the body of rod 3 grouted part is threaded with cone core 5, and the epimere of the body of rod 3 is connected with pallet 2 and locking nut 1.
Constant-resistance prestressed anchor of the present invention not only can provide enough prestressing force at tunnel (road) or roadway support initial stage, and along with the failure by rupture of country rock or constant anchored force can be provided under the percussions such as rock burst under condition of high ground stress, give full play to the intensity of anchor rod body, while making the energy of country rock obtain fully release, ensure that its stability, effectively can control the heavily stressed disasters such as deep-buried underground engineering country rock peels off, rock burst.
Claims (2)
1. a swollen shell-type constant-resistance prestressed anchor, the body of rod (3) comprising anchor pole and the pallet (2) being connected to the body of rod (3) upper end and locking nut (1) and be connected to the cone core (5) of the body of rod (3) lower end and be sleeved on cone core (5) swollen shell (4) outward, it is characterized in that: the internal face of described swollen shell (4) is provided with step constant-resistance boss, the outside wall surface of cone core (5) is provided with the step constant-resistance boss corresponding with the step constant-resistance boss that swollen shell (4) is arranged, the step taper surface that the step taper surface that step constant-resistance boss on swollen shell (4) is formed is formed with the step constant-resistance boss on cone core (5) is slidably matched each other.
2. a kind of swollen shell-type constant-resistance prestressed anchor as claimed in claim 1, the step constant-resistance boss boss bottom on described cone core (5) is positioned at 1/2 ~ 2/3 place of cone core (5) length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310299758.5A CN103334780B (en) | 2013-07-17 | 2013-07-17 | A kind of swollen shell-type constant-resistance prestressed anchor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310299758.5A CN103334780B (en) | 2013-07-17 | 2013-07-17 | A kind of swollen shell-type constant-resistance prestressed anchor |
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| Publication Number | Publication Date |
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| CN103334780A CN103334780A (en) | 2013-10-02 |
| CN103334780B true CN103334780B (en) | 2016-01-20 |
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| CN201310299758.5A Expired - Fee Related CN103334780B (en) | 2013-07-17 | 2013-07-17 | A kind of swollen shell-type constant-resistance prestressed anchor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626112B (en) * | 2016-01-08 | 2019-01-04 | 尤洛卡（山东）环境工程有限公司 | A kind of suspension device and its application method based on built-in constant-resistance device |
| CN106499412A (en) * | 2016-12-02 | 2017-03-15 | 西南交通大学 | A kind of anti-rock burst method for protecting support in the tunnel with active support as theory and support system |
| CN110043300B (en) * | 2019-04-12 | 2020-05-19 | 长江水利委员会长江科学院 | Umbrella-shaped anchor for rapidly reinforcing rock mass and application method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2508646A1 (en) * | 1975-02-28 | 1976-09-09 | Bergwerksverband Gmbh | EXPANDABLE DRILL HOLE SEAL |
| SU1065616A1 (en) * | 1982-08-25 | 1984-01-07 | Всесоюзный научно-исследовательский институт золота и редких металлов | Anchor |
| GB2257223A (en) * | 1991-06-27 | 1993-01-06 | Jennmar Corp | Resin bonded expansion assembly |
| CN2238911Y (en) * | 1995-12-12 | 1996-10-30 | 李永和 | Whole-long anchor fixed wedge expansion plastic-steel whole-long archor pin |
| CN2809009Y (en) * | 2005-07-08 | 2006-08-23 | 吴德兴 | Expansion shell anchor rod for multifunctional stop-grouting plug |
| CN102808635A (en) * | 2012-07-20 | 2012-12-05 | 中国科学院武汉岩土力学研究所 | Expanding shell type inner anchor head pre-stressed anchor rod and installation using method thereof |
| CN202936791U (en) * | 2012-10-26 | 2013-05-15 | 兰州大学 | Pre-stressed anchor rod prevented from being pulled out of anchor eye |
| CN203347813U (en) * | 2013-07-17 | 2013-12-18 | 中国科学院武汉岩土力学研究所 | Expansion shell type constant-resistance pre-stressed bolt |
-
2013
- 2013-07-17 CN CN201310299758.5A patent/CN103334780B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2508646A1 (en) * | 1975-02-28 | 1976-09-09 | Bergwerksverband Gmbh | EXPANDABLE DRILL HOLE SEAL |
| SU1065616A1 (en) * | 1982-08-25 | 1984-01-07 | Всесоюзный научно-исследовательский институт золота и редких металлов | Anchor |
| GB2257223A (en) * | 1991-06-27 | 1993-01-06 | Jennmar Corp | Resin bonded expansion assembly |
| CN2238911Y (en) * | 1995-12-12 | 1996-10-30 | 李永和 | Whole-long anchor fixed wedge expansion plastic-steel whole-long archor pin |
| CN2809009Y (en) * | 2005-07-08 | 2006-08-23 | 吴德兴 | Expansion shell anchor rod for multifunctional stop-grouting plug |
| CN102808635A (en) * | 2012-07-20 | 2012-12-05 | 中国科学院武汉岩土力学研究所 | Expanding shell type inner anchor head pre-stressed anchor rod and installation using method thereof |
| CN202936791U (en) * | 2012-10-26 | 2013-05-15 | 兰州大学 | Pre-stressed anchor rod prevented from being pulled out of anchor eye |
| CN203347813U (en) * | 2013-07-17 | 2013-12-18 | 中国科学院武汉岩土力学研究所 | Expansion shell type constant-resistance pre-stressed bolt |
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| CN103334780A (en) | 2013-10-02 |
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