CN103899341A - Pressure-bearing type end-anchoring high-pretightening-force anchor rod support method - Google Patents
Pressure-bearing type end-anchoring high-pretightening-force anchor rod support method Download PDFInfo
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- CN103899341A CN103899341A CN201410124180.4A CN201410124180A CN103899341A CN 103899341 A CN103899341 A CN 103899341A CN 201410124180 A CN201410124180 A CN 201410124180A CN 103899341 A CN103899341 A CN 103899341A
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- pretightening
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Abstract
The invention discloses a pressure-bearing type end-anchoring high-pretightening-force anchor rod support method which is applicable to surrounding rock support in mine sinking and driving engineering. According to the method, at the end of the hole bottom, an anchor rod is fully adhered to surrounding rocks of the bottom of an anchor rod hole through a resin cartridge, and end anchoring effect is realized; a PVC (polyvinyl chloride) sleeve or a sleeve made of similar materials is mounted on an anchor rod body of a free section, a space between the sleeve and the anchor rod hole is filled with cement mortar, a cement mortar body is fully adhered to surrounding rocks of the anchor rod hole, and the cement mortar body cannot be adhered to the anchor rod due to the sleeve, so that pretightening force can be ensured to be applied to the anchor rod at different time periods, and the pretightening force of the anchor rod can be remarkably increased; particularly, under the condition of weak surrounding rocks, the cement mortar body of the free section can bear the pretightening force if an anchoring section at the resin end is displaced, so that support efficiency of the pretightening-force anchor rod is guaranteed to the greatest extent, and stability and safety of surrounding rocks of deep tunnels are facilitated.
Description
Technical field
The present invention relates to the high pretightning force anchor rod support method of pressure-bearing type end anchor, be particularly useful for the control of deep tunnel weak surrounding rock stability; Also be applicable to supporting and the maintenance of mine tunnel engineering and high gradient slope engineering.
Background technology
Prestressed anchor supporting is the technical way of current deep tunnel displacement stability control.The anchorage style of anchor pole has end anchorage, full length fastening and the extensible bolting several.
When end anchorage, free section is long, and the sphere of action of anchor rod prestress is large, and the effective compressive stress district thickness forming is large, but free section middle part compressive stress is little, thereby affects anchoring effect.Axis force of anchor is except anchored end, its body of rod is stressed is equally distributed along its length, and within the scope of anchoring, the absciss layer of rock stratum, any position is all distributed in the length of the whole body of rod equably, thereby cause the body of rod stressed insensitive to surrouding rock deformation and absciss layer, the rigidity of support system is low.In order to improve the rigidity of end anchor anchor pole, can only apply larger prestressing force, but in the time that country rock is weak loose, anchored end is easily subjected to displacement even slip, cause anchor pole to lose efficacy.
When full length fastening, free section is short, little when anchor rod prestress sphere of action ratio end anchor, the effective compressive stress district thickness forming is little, now anchor rod body stress, strain are inhomogeneous along rock-bolt length direction distributed pole, absciss layer and the large position rockbolt stress that slides are very large, the body of rod and injecting cement paste are stressed very sensitive to surrouding rock deformation and absciss layer, and the rigidity of support system is large.For injecting cement paste, in tension state, stress performance is the poorest, and simultaneously because freedom length is less, prestress application is limited, can not fully realize active support.
Therefore, for the prestressed anchor supporting of Deep Soft Rock Tunnel, not only require anchor pole that enough pretightning forces can be provided, to control absciss layer and the distortion of country rock, prevention anchor pole in the time of the slip of end anchor section still can provide effectively enough supporting intensities again.
Summary of the invention
Technical problem: the object of the invention is to overcome the deficiency in existing bolt support technology, provide a kind of simple in structure, anchoring effect good, can apply enough pretightning forces and guarantee in the section partial failure of anchor pole end anchor or when entirely ineffective, anchor pole still can provide the high pretightning force anchor rod support method of pressure-bearing type end anchor of enough supporting intensity.
Technical scheme: the high pretightning force anchor rod support method of pressure-bearing type end anchor of the present invention, comprises the steps:
A, according to the requirement of roadway surrounding rock condition and stability control, design bolt pretension size, end anchor section anchorage length and bolt interval, by the design parameters armature boring of constructing;
B, installation end anchor resin anchor, the anchor pole that first head is equipped with to resin explosive roll is sent in the armature boring of having constructed and is held anchor, then PVC sleeve pipe is installed on free section, at drilling orifice place, Grouting Pipe and stack are set, use afterwards sealing-plug fixing PVC sleeve pipe, Grouting Pipe and stack, and seal up aperture, and last, item is installed on anchor pole revealed section and is leaned against the anchor rod pallet board 2 of drilling orifice periphery and the nut of fastening anchor rod pallet board;
C, nut is applied to pretightning force, until reach designing requirement;
D, by Grouting Pipe to injected water cement mortar in armature boring, make to be full of slurries between PVC sleeve pipe and armature boring wall, until stack has slurries to flow out,
E, according to on-the-spot country rock situation, can again or repeatedly apply pretightning force to nut.
Beneficial effect: the present invention one is that anchor pole country rock at the bottom of bottom, hole is by resin explosive roll and bolthole fully coheres, and realizes end anchorage effect, the 2nd, the sleeve pipe of PVC sleeve pipe or similar material is installed on free segment anchor bar body, and adopt cement mortar that the space between sleeve pipe and bolthole is filled, mortar body and bolthole country rock are well-bonded, because of the existence of sleeve pipe, mortar body and anchor pole are without cohering, thereby can guarantee, in the different periods, anchor pole is applied to pretightning force, can make the pretightning force of anchor pole increase substantially simultaneously, especially under weak surrounding rock condition, if while there is displacement because of tension in resin end anchor section, can be by free segment injecting cement paste bearing pretightening force, thereby guarantee to greatest extent the supporting usefulness of prestressed anchor, be conducive to deep tunnel adjoining rock stability and safety.The present invention had both realized the end anchorage effect of anchor pole, again because of the existence of free segment anchor bar body, and conveniently apply pretightning force, simultaneously can be in the time that anchoring section be mobile because rock mass weakness deforms, still keep because the existence of free segment injecting cement paste makes the supporting usefulness of anchor pole, injecting cement paste bears pressure-acting.Can fully guarantee the supporting effect of Deep Soft Rock Tunnel prestressed anchor, both guarantee that anchor pole applied enough pretightning forces to roadway surrounding rock, guarantee that again anchor pole still can provide enough supporting intensity and support rigidity in the situation that end anchor lost efficacy.Compared with traditional prestressing force end anchor bolt support technology, mortar Full-grouted Bolt support technology, tool has the following advantages:
1) due to free segment rockbolt installation PVC sleeve pipe, provide condition for apply pretightning force to anchor pole under slip casting condition;
2) at the rockbolt installation initial stage, owing to adopting resin end anchor structure, thereby can provide enough pretightning forces to roadway surrounding rock in time, give full play to effect of anchor pole active support, and control initial deformation and the absciss layer of roadway surrounding rock, be conducive to globality and the stability control of country rock;
3) because the gap between free segment anchor pole hole wall and PVC sleeve pipe is full of by cement mortar, thereby guaranteed anchor pole end anchor section be subjected to displacement or the rough sledding that lost efficacy under, free segment injecting cement paste can be used as bearing structure and bears the pressure that resin anchoring end transmits, and does not make anchor pole lose efficacy under weak surrounding rock condition;
4) free segment mortar body bears the pressure being transmitted by resin anchoring end, has given full play to cement mortar material load performance and has been better than the feature of examining tensile behavior, thereby had more superior service behaviour than full length fastening tension type anchor pole.
5) this anchor pole has good displacement Ductility, and anchor pole has very large displacement before supporting destroys, and this just provides a kind of early warning for surrounding rock supporting, and when bolt support simultaneously destroys, bearing capacity can obviously not decline, and residual strength is higher.
6) because free segment injecting cement paste is in three dimension stress state, strengthen the extrusion friction of anchor pole and country rock, the maximum pretightning force that anchor pole can bear has larger raising compared with prestressed anchor and mortar Bolt, and anti-corrosive properties and the durability of anchor pole is also relatively good under this state.
Accompanying drawing explanation
Fig. 1 is surrounding rock supporting structural representation of the present invention.
In figure: 1-nut; 2-anchor rod pallet board; 3-stack; 4-Grouting Pipe; 5-sealing-plug; 6-anchor pole; 7-PVC sleeve pipe; 8-armature boring; 9-resin explosive roll; 10-country rock.
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
The high pretightning force anchor rod support method of pressure-bearing type end anchor of the present invention, concrete steps are as follows:
A, according to the requirement of roadway surrounding rock condition and stability control, design bolt pretension size, end anchor section anchorage length and bolt interval, press design parameters at design attitude jumbolter 10 Drilling armature borings 8 in country rock, and by clean bolthole cleaning;
B, installation end anchor resin anchor, on request by resin explosive roll 9 load holes, according to the end anchor length of design, the anchor pole 6 that first head is equipped with to resin explosive roll is sent in the armature boring of having constructed and is held anchor, then on anchor pole 6 free segments, PVC sleeve pipe 7 is installed, PVC sleeve pipe 7 is arranged on anchor pole 6 from holding anchor section top to this segment distance of free segment top, then Grouting Pipe 4 and stack 3 are set at drilling orifice place, Grouting Pipe 4 is fixed on to the lower end of anchor pole 6, stack 3 bonds apart from the place (along anchor pole downward direction) of end anchor section top certain distance on PVC sleeve pipe 7, guarantee smooth gas discharge, afterwards with urethane seal plug 5 fixing PVC sleeve pipes 7, Grouting Pipe 4 and stack 3, and seal up aperture, with cotton yarn by tight sealing-plug 5 surroundings encapsulation, agitating resin powder stick 9, until resin explosive roll 9 fixed completely after, item is installed on anchor pole revealed section and is leaned against the anchor rod pallet board 2 of drilling orifice periphery and the nut 1 of fastening anchor rod pallet board 2,
C, then with torque amplification tightening nut 1, anchor pole 6 is applied to high pretightning force and carry out stretch-draw, until reach designing requirement;
D, configure cement grout, to the interior injected water cement mortar of armature boring 8, make the space between PVC sleeve pipe 7 and armature boring wall be full of slurries by Grouting Pipe 4, until stack 3 has slurries to flow out;
E, because mortar body and anchor pole 6 is without cohering, thereby can guarantee, in the different periods, anchor pole is applied to pretightning force, can make the pretightning force of anchor pole increase substantially simultaneously, according to on-the-spot country rock situation, can again or repeatedly apply pretightning force to nut 1.
Claims (1)
1. the high pretightning force anchor rod support method of pressure-bearing type end anchor, is characterized in that, comprises the steps:
A, according to the requirement of roadway surrounding rock condition and stability control, design bolt pretension size, end anchor section anchorage length and bolt interval, by the design parameters armature boring (8) of constructing;
B, installation end anchor resin anchor, the anchor pole (6) that first head is equipped with to resin explosive roll is sent in the armature boring of having constructed and is held anchor, then on anchor pole (6) free segment, PVC sleeve pipe (7) is installed, arrange at drilling orifice place Grouting Pipe (4) and stack (3) _, use afterwards sealing-plug (5) fixing PVC sleeve pipe (7), Grouting Pipe (4) and stack (3), and seal up aperture, finally, item is installed on anchor pole revealed section and is leaned against the anchor rod pallet board (2) of drilling orifice periphery and the nut (1) of fastening anchor rod pallet board (2),
C, nut (1) is applied to pretightning force, until reach designing requirement;
D, by Grouting Pipe (4) to interior the injected water cement mortar of armature boring (8), make to be full of slurries between PVC sleeve pipe (7) and armature boring wall, until stack (3) has slurries outflows;
E, according to on-the-spot country rock situation, can again or repeatedly apply pretightning force to nut (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410124180.4A CN103899341B (en) | 2014-03-28 | 2014-03-28 | Pressure-bearing type end anchor high pretightening force anchor rod support method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410124180.4A CN103899341B (en) | 2014-03-28 | 2014-03-28 | Pressure-bearing type end anchor high pretightening force anchor rod support method |
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| CN103899341A true CN103899341A (en) | 2014-07-02 |
| CN103899341B CN103899341B (en) | 2016-04-20 |
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| CN201410124180.4A Expired - Fee Related CN103899341B (en) | 2014-03-28 | 2014-03-28 | Pressure-bearing type end anchor high pretightening force anchor rod support method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405424A (en) * | 2014-11-17 | 2015-03-11 | 神华集团有限责任公司 | Full-length-anchoring anchor rod and anchoring method |
| CN104453961A (en) * | 2014-11-17 | 2015-03-25 | 成都理工大学 | Pressing seam type friction type constant-resistance anchor rod |
| CN104632260A (en) * | 2015-03-19 | 2015-05-20 | 中国长江三峡集团公司 | High-compactness anchor rod grouting method |
| CN106223990A (en) * | 2016-07-27 | 2016-12-14 | 屈荐映 | A kind of building municipal works anchor pole |
| CN107013238A (en) * | 2017-03-20 | 2017-08-04 | 化工部长沙设计研究院 | Resin mortar combined bolt support structure and its construction method |
| CN107676121A (en) * | 2017-11-10 | 2018-02-09 | 长安大学 | A kind of tunnel prestressed anchor and anchoring process |
| CN109083665A (en) * | 2018-10-17 | 2018-12-25 | 河南理工大学 | Bolt device and its anchoring construction method |
| CN109406007A (en) * | 2018-12-07 | 2019-03-01 | 中铁隧道局集团有限公司 | A kind of severe cold area Railway Tunnel country rock temperature field testing device and its method for embedding |
| CN109443595A (en) * | 2018-11-16 | 2019-03-08 | 西南交通大学 | The in-situ testing device and its home position testing method of tunnel homoiothermal ring |
| CN110230511A (en) * | 2019-06-21 | 2019-09-13 | 安徽理工大学 | A kind of anchor dispensing device that can be vented for common bolt and its application method |
| CN114319345A (en) * | 2022-02-14 | 2022-04-12 | 大成科创基础建设股份有限公司 | Glass fiber anchor rod anchoring device and construction method |
| CN114483129A (en) * | 2022-01-26 | 2022-05-13 | 嵩县山金矿业有限公司 | Full-length anchoring method for prestressed long anchor cable of underground broken surrounding rock large-span chamber |
| WO2024088045A1 (en) * | 2022-10-29 | 2024-05-02 | 华能澜沧江水电股份有限公司 | Active control method and device for large deformation of deep thin-layered surrounding rock |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139323A (en) * | 1976-06-01 | 1979-02-13 | Gebirgssicherung - Ges.M.B.H. | Rock anchor |
| CN2229515Y (en) * | 1994-08-31 | 1996-06-19 | 王永胜 | End anchor type anchoring-bolt with recoverable bolt body |
| CN1712670A (en) * | 2005-07-13 | 2005-12-28 | 吴德兴 | Slip casting roof bolt with anticorrosive casing pipe |
| CN102022129A (en) * | 2010-10-15 | 2011-04-20 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Anchorage length limit device for grouting anchor cable |
| CN102359386A (en) * | 2011-10-28 | 2012-02-22 | 湖南科技大学 | Shearing sleeve type yielding bolt |
| CN102536278A (en) * | 2012-01-15 | 2012-07-04 | 山东科技大学 | Progressive yielding combined-type extensible anchor rod and construction method thereof |
| CN103032086A (en) * | 2012-12-07 | 2013-04-10 | 中国矿业大学 | Method for filling resin explosive cartridge in drilled hole of tunnel roof anchor rod |
-
2014
- 2014-03-28 CN CN201410124180.4A patent/CN103899341B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139323A (en) * | 1976-06-01 | 1979-02-13 | Gebirgssicherung - Ges.M.B.H. | Rock anchor |
| CN2229515Y (en) * | 1994-08-31 | 1996-06-19 | 王永胜 | End anchor type anchoring-bolt with recoverable bolt body |
| CN1712670A (en) * | 2005-07-13 | 2005-12-28 | 吴德兴 | Slip casting roof bolt with anticorrosive casing pipe |
| CN102022129A (en) * | 2010-10-15 | 2011-04-20 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Anchorage length limit device for grouting anchor cable |
| CN102359386A (en) * | 2011-10-28 | 2012-02-22 | 湖南科技大学 | Shearing sleeve type yielding bolt |
| CN102536278A (en) * | 2012-01-15 | 2012-07-04 | 山东科技大学 | Progressive yielding combined-type extensible anchor rod and construction method thereof |
| CN103032086A (en) * | 2012-12-07 | 2013-04-10 | 中国矿业大学 | Method for filling resin explosive cartridge in drilled hole of tunnel roof anchor rod |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453961A (en) * | 2014-11-17 | 2015-03-25 | 成都理工大学 | Pressing seam type friction type constant-resistance anchor rod |
| CN104453961B (en) * | 2014-11-17 | 2016-07-27 | 成都理工大学 | A kind of overlapping seam type friction-type constant-resistance anchor pole |
| CN104405424A (en) * | 2014-11-17 | 2015-03-11 | 神华集团有限责任公司 | Full-length-anchoring anchor rod and anchoring method |
| CN104632260A (en) * | 2015-03-19 | 2015-05-20 | 中国长江三峡集团公司 | High-compactness anchor rod grouting method |
| CN104632260B (en) * | 2015-03-19 | 2017-09-29 | 中国长江三峡集团公司 | A kind of high solidity bolt grouting method |
| CN106223990A (en) * | 2016-07-27 | 2016-12-14 | 屈荐映 | A kind of building municipal works anchor pole |
| CN107013238A (en) * | 2017-03-20 | 2017-08-04 | 化工部长沙设计研究院 | Resin mortar combined bolt support structure and its construction method |
| CN107676121B (en) * | 2017-11-10 | 2024-05-14 | 长安大学 | Tunnel prestressed anchor rod and anchoring method |
| CN107676121A (en) * | 2017-11-10 | 2018-02-09 | 长安大学 | A kind of tunnel prestressed anchor and anchoring process |
| CN109083665A (en) * | 2018-10-17 | 2018-12-25 | 河南理工大学 | Bolt device and its anchoring construction method |
| CN109083665B (en) * | 2018-10-17 | 2024-05-28 | 河南理工大学 | Full-length anchoring anchor rod device and anchoring construction method thereof |
| CN109443595A (en) * | 2018-11-16 | 2019-03-08 | 西南交通大学 | The in-situ testing device and its home position testing method of tunnel homoiothermal ring |
| CN109406007A (en) * | 2018-12-07 | 2019-03-01 | 中铁隧道局集团有限公司 | A kind of severe cold area Railway Tunnel country rock temperature field testing device and its method for embedding |
| CN110230511A (en) * | 2019-06-21 | 2019-09-13 | 安徽理工大学 | A kind of anchor dispensing device that can be vented for common bolt and its application method |
| CN114483129A (en) * | 2022-01-26 | 2022-05-13 | 嵩县山金矿业有限公司 | Full-length anchoring method for prestressed long anchor cable of underground broken surrounding rock large-span chamber |
| CN114319345A (en) * | 2022-02-14 | 2022-04-12 | 大成科创基础建设股份有限公司 | Glass fiber anchor rod anchoring device and construction method |
| WO2024088045A1 (en) * | 2022-10-29 | 2024-05-02 | 华能澜沧江水电股份有限公司 | Active control method and device for large deformation of deep thin-layered surrounding rock |
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