CN103603684A - Large-deformation pre-stressed anchor bolt - Google Patents
Large-deformation pre-stressed anchor bolt Download PDFInfo
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- CN103603684A CN103603684A CN201310610440.4A CN201310610440A CN103603684A CN 103603684 A CN103603684 A CN 103603684A CN 201310610440 A CN201310610440 A CN 201310610440A CN 103603684 A CN103603684 A CN 103603684A
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- anchor
- cylindrical shell
- rod body
- anchor bolt
- anchor rod
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Abstract
The invention discloses a large-deformation pre-stressed anchor bolt which comprises a slotted capped cylinder, a tapered wedge, a gasket, a locking nut and an anchor bolt body. The anchor bolt body penetrates the slotted capped cylinder, the tapered wedge, the gasket and the locking nut sequentially. The slotted capped cylinder is embedded into the mouth of a drilled hole and is matched with the tapered wedge though frictional contact. The front end of the tapered wedge is inserted into the slotted capped cylinder and is locked and fixed by the gasket and the locking nut from the outside. The anchor bolt body is a threaded solid rebar or hollow steel tube. One end of the anchor bolt body is twisted or linear, the middle of the anchor bolt body is sinusoidal-wave-shaped, and the other end of the anchor bolt body is provided with an outer thread. The large-deformation pre-stressed anchor bolt is simple in structure, convenient to operate, high in deformability, looseness resistant, good in working mechanical property, low in cost, easy to process, convenient to mount and especially applicable to underground constructions such as coal mines and tunnels.
Description
Technical field
The present invention relates to geotechnical engineering anchoring field, more specifically relate to a kind of large deformation prestressed anchor, be applicable to colliery, highway tunnel and slope project, and other relates to the geotechnical engineering of soft rock mass anchoring support, can in the situation that country rock produces moderate finite deformation, keep certain anchored force, be conducive to the lasting security of anchoring support system with effective.
Background technology
In the production of the deep-buried underground engineering such as colliery, tunnel and process of construction, often can run into the supporting problem of weak surrounding rock, because soft rock is out of shape greatly under high-ground stress effect, and the duration is long, therefore supporting measure is had higher requirement.At present, in engineering, often adopt the mode of the bolt support reinforce adjoining rock, but the common suitable for surrounding rock deformability of existing anchor pole a little less than, or provide anchored force less, when soft rock mass deflection is large, very easily cause that the cementing emaciated face of anchoring glues inefficacy, the surrender of Bolted Rock Masses body etc., make anchor rod anchored ability greatly reduce and lose efficacy, and then cause surrouding rock stress rapid adjustment, energy release of surrounding rock speed is fast, cause supporting and protection structure to damage, burst accident easily occurs.And existing anchor pole in use often can cause due to the effect of blasting vibration load and Cyclic Loading getting loose, reduced the anchoring ability of anchor pole.Therefore, be necessary to invent the large deformation prestressed anchor that a kind of deformability is strong, mechanical property is good, to adapt to the needs of weakness, breaking surrounding rock anchoring support.
According to periodical literature and patent retrieval, about large deformation prestressed anchor, there is following result:
Rely deserved (several Extendable anchor rods [J], coal mining, 1998,3:49-50) Extendable anchor rod is carried out to statistical analysis, can relax elongate bolt, the body of rod of total snake type telescopic anchoring-bolt, sleeve friction formula Extendable anchor rod, aperture spring compression type extends and aperture compression Extendable anchor rod, plastics compression cylinder Extendable anchor rod and body of rod elongated spacing Extendable anchor rod etc.Lee's axle (a kind of novel Extendable anchor rod [J] that is applicable to Large Deformation Support, Central-South highway engineering, 2007,32 (2): 103-105,127) has proposed a kind of sleeve friction-type large deformation anchor rod, all has stronger deformability.Time has proposed a kind of H type body of rod and afterbody modified Extendable anchor rod towards Chiung (Extendable anchor rod Principle and application, northeast colliery engineering, 1995,5:21-25,32).Wu Dexing (patent No.: 200610051809.2, patent name: a kind of prestress anchor device) proposed a kind of prestress anchor device, once grouting can be realized anchoring section and free segment mortar depositing construction, but structure is comparatively complicated.Qin Weimin (patent No.: 03128107.9 patent name: a kind of sand consolidated anchorage prestressed bolt and anchoring process thereof) has proposed a kind of preparation method of sand consolidated anchorage prestressed bolt, has improved success rate and the anchoring ability of the fixed anchor pole of sand.
Except above research and achievement, end retrieve about the research of large deformation prestressed anchor and product, also have a lot, but due to complex structure, anchoring effect is poor and be not easy to the reasons such as construction, these anchor poles are all last to be widely applied in engineering.
Summary of the invention
The object of the invention is to be to provide a kind of large deformation prestress anchor device, simple in structure, easy to operate, deformability is strong, have anti-loose function, work mechanical property is good, and cost is low, be easy to processing, easy for installation, be particularly suitable for the underground constructions such as colliery, tunnel.
In order to achieve the above object, the present invention adopts following technical scheme:
Be adapted to a large deformation prestressed anchor for weak surrounding rock, comprise crack band cap cylindrical shell, taper wedge, pad, locking nut, anchor rod body.It is characterized in that: anchor rod body is successively through band cap cylindrical shell, taper wedge, pad, the locking nut of cracking, the band cap cylindrical shell that cracks embeds drilling orifice, crack and be with cap cylindrical shell and taper wedge to match by CONTACT WITH FRICTION, taper wedge front end inserts the band cap cylindrical shell that cracks, and finally by locking nut, is locked.Anchor rod body is threaded solid reinforcing bar or hollow steel pipe, and anchor rod body one end is fried dough twist type or linear pattern, as anchoring section; Anchor rod body middle part is sinusoidal waveform profile type, can be stretching after anchor rod body is stressed, increase anchor rod body deformability; The anchor rod body other end, with external screw thread, applies pretightning force by screwing nut.The band cap cylindrical shell that cracks is made by 6～8mm steel sheet and plate, and cylinder body bottom leaves the hole that anchor rod body passes.Segmental arc central angle is between 100 °～120 °, and its effect is to play cushioning effect after anchor pole bears axle power, prevents that anchor rod body from getting loose as the used time being subject to Cyclic Loading and vibrating load; The wing plate cracking with cap cylindrical shell mainly plays pressure-bearing effect, by adjusting its radius size, can adapt to different pressure-bearing needs; Crack and along partial design, become to upwarp shape with the wing of cap cylindrical shell, can, after the band cap cylindrical shell that cracks is stressed, along country rock right in the face, slide.The band cap cylindrical shell that cracks is processed with a longitudinal joint, makes taper wedge can slip into cylindrical shell under certain pressure effect.The band cap cylindrical shell that cracks combines with taper wedge on the one hand, and the Frictional Slipping by taper wedge in cylindrical shell provides the moderate finite deformation of anchor pole, also plays on the other hand the effect of bearing plate.Taper wedge is processed by lathe by round steel, in it, leave the cavity that anchor rod body passes, taper wedge one end diameter is slightly less than the barrel diameter cracking with cap cylindrical shell, and other end diameter is greater than cylindrical shell, by adjusting the diameter of taper wedge, can obtain different anchor pole working resistances.
Because large deformation prestressed anchor elongation is comprised of the stretching part of anchor pole curved portion, cylindrical shell length part and the ductility elongated portion of the body of rod own, so large deformation prestressed anchor deflection is much larger than traditional prestressed anchor.By adjusting the waveform number of anchor pole curved section and the length of cylindrical shell, almost can adapt to various weak surrounding rock anchoring needs.
Anchoring process of the present invention, the steps include:
A, adopt rig to get out landwaste and dust to rinse well, if aperture country rock has, cave in, should adopt cement mortar benefit circular, if aperture country rock wall out-of-flatness should adopt cement screed in the ，Bing Jiang hole, rockbolt installation hole in.After boring is ready to, at the bottom of Anchor Agent (accelerated cement powder stick or resin explosive roll) is pushed into hole;
After B, boring are ready to, anchor rod body is inserted in rotation, at the bottom of patchhole after, anchor rod body should rotate 1-3 minute, to guarantee that Anchor Agent and anchor rod body bonding evenly, in this process, should guarantee that the body of rod is positioned at the centre position of holing;
C, the band cap cylindrical shell that will crack penetrate on anchor pole, and cylindrical shell is pushed in boring, and guarantee that cylinder body outer wall contacts with country rock well, does not exist large hole;
D, on anchor rod body, penetrate taper wedge, pad and locking nut successively, taper wedge front end should with the band cap cylindrical shell centering enter cylindrical shell a little (5～10mm) of cracking, then rotational lock nut forms certain pretightning force, after Anchor Agent reaches design strength (time is determined by used rapid solidification anchor agent performance), rotational lock nut makes anchor pole reach the pretightning force of design, passes through the degree of tightness that digital display type torque wrench is controlled locking nut in this process.
Compared with prior art, tool of the present invention has the following advantages:
(1) deformability is strong.Large deformation prestressed anchor has larger elongation strain ability, bolt deformation comprises that cylindrical shell length part, body of rod curved section elongate the ductility elongated portion of part and anchor pole itself, by adjusting cylindrical shell length and body of rod curved section length, can adapt to various weaknesses, breaking surrounding rock.
(2) there is anti-loose function.Large deformation prestressed anchor cracks and can after rockbolt stress, play cushioning effect with the design of the segmental arc of cap cylindrical shell and wing plate, to prevent that anchor pole from getting loose when vibrating load and the reciprocating load,
(3) work mechanical property is good.After rockbolt installation, with country rock shape, anchor-holding force of anchor bolt increases gradually, when reaching the stretching required load of curved section, anchor pole curved section starts to extend, anchored force continues to increase, after curved section is straightened, with anchored force, increase, taper wedge starts to enter anchor pole cylindrical shell, anchor rod anchored force retaining is constant, until taper wedge arrives cylinder body bottom, with anchored force, continue to increase, the body of rod is elongated and enters ductility and destroy, in this course, anchor pole has experienced the different phase of anchored force increase-increase-constant-increase, be particularly suitable for the supporting demand of weak surrounding rock.
(4) large deformation prestressed anchor adopts the materials such as regular screw threads reinforcing bar and steel plate to make, and cost is lower, is easy to processing, easy for installation, is particularly suitable for the underground constructions such as colliery, tunnel.
Fig. 1 is the present invention's model large deformation prestressed anchor and the contrast of traditional prestressed anchor drawing empirical curve, as we know from the figure, and more than prestressed anchor elongation of the present invention can reach 30cm, considerably beyond the elongation of traditional prestressed anchor.
Accompanying drawing explanation
Fig. 1 is certain model large deformation prestressed anchor and traditional prestressed anchor drawing empirical curve contrast schematic diagram.
Fig. 2 is a kind of large deformation prestressed anchor structural representation.
Fig. 3 is a kind of anchor rod body schematic diagram.
Fig. 4 is a kind of band cap tubular construction schematic diagram that cracks, and wherein Fig. 3 A is lateral view, and Fig. 3 B is top view.
Fig. 5 is a kind of rockbolt installation working drawing.
Wherein: 1 for the band cap cylindrical shell that cracks, 2 is for taper wedge, 3 is for pad, 4 is for locking nut, 5 is for anchor rod body, 1A are that cylindrical shell, 1B are that segmental arc, 1C are that wing plate, 1D be the wing are that the outer anchor section of anchor rod body, 5B are that anchor rod body free segment, 5C are anchor rod body anchoring section along, 5A, Anchor Agent 6, hole 7.
The specific embodiment
Embodiment 1:
Below in conjunction with Fig. 2～Fig. 5, the present invention is further illustrated:
As shown in Figure 2, a kind of large deformation prestressed anchor, comprises crack band cap cylindrical shell 1, taper wedge 2, pad 3, locking nut 4, anchor rod body 5.Anchor rod body 5 is successively through band cap cylindrical shell 1, taper wedge 2, pad 3, the locking nut 4 of cracking, the band cap cylindrical shell 1 that cracks embeds drilling orifice, the band cap cylindrical shell 1 that cracks matches by CONTACT WITH FRICTION with taper wedge 2, taper wedge 2 front ends insert the band cap cylindrical shell 1 that cracks, and finally by pad 3 and locking nut 4, from outside, are locked.
As shown in Figure 3, anchor rod body 5 comprises anchoring section 5A, free segment 5B and outer anchor section 5C.Anchoring section 5A is connected with free segment 5B, and free segment 5B is connected with outer anchor section 5C, and actual is that a body of rod processes.Free segment is that anchor pole is positioned at not bonded section of boring.
From Fig. 4 and Fig. 5, the band cap cylindrical shell 1 that cracks comprises cylindrical shell 1A, segmental arc 1B, wing plate 1C and the wing along 1D.Cylindrical shell 1A and segmental arc 1B are smoothly connected, and segmental arc 1B and wing plate 1C are smoothly connected, and wing plate 1C and the wing are smoothly connected along 1D.Crack band cap cylindrical shell 1 with a longitudinal joint, make taper wedge can slip into cylindrical shell under certain pressure effect.After boring 7 gets out, landwaste in hole and dust are rinsed well, and aperture country rock wall is filled, aperture collapse hole part is by circular, by Anchor Agent 6(accelerated cement powder stick or resin explosive roll) be pushed into hole at the bottom of, under rig drives, anchor rod body 5 is inserted in rotation, after at the bottom of patchhole, rotation anchor rod body 5 is answered 1-3 minute, make to guarantee that anchor rod body 5 should be positioned in the middle of boring 7 simultaneously, the band cap cylindrical shell 1 that will crack subsequently penetrates on anchor rod body 5, and cylindrical shell 1A is pushed in boring 6, and guarantee that cylindrical shell 1A outer wall contacts with country rock well, then on anchor rod body 5, penetrate successively taper wedge 2, pad 3 and locking nut 4, by taper wedge front end and band cap cylindrical shell 1 centering push cylindrical shell 1A of cracking, rotational lock nut 4 forms certain pretightning force, until Anchor Agent 6, reach after design strength, using digital display type torque wrench to screw locking nut 4 makes anchor pole reach the pretightning force of design.
Claims (4)
1. a large deformation prestressed anchor, comprise the band cap cylindrical shell (1) that cracks, taper wedge (2), pad (3), locking nut (4), anchor rod body (5), it is characterized in that: anchor rod body (5) is successively through the band cap cylindrical shell (1) that cracks, taper wedge (2), pad (3), locking nut (4), the band cap cylindrical shell (1) that cracks embeds drilling orifice, the band cap cylindrical shell (1) that cracks matches by CONTACT WITH FRICTION with taper wedge (2), taper wedge (2) front end inserts the band cap cylindrical shell (1) that cracks, pad (3) and locking nut (4) are locked from outside.
2. according to a kind of large deformation prestressed anchor described in right 1, it is characterized in that: described anchor rod body (5) is threaded solid reinforcing bar or hollow steel pipe, anchor rod body (5) one end is fried dough twist type or linear pattern, anchor rod body (5) middle part is sinusoidal waveform profile type, and anchor rod body (5) other end is with external screw thread.
3. according to a kind of large deformation prestressed anchor described in right 1, it is characterized in that: described anchor rod body (5) comprises anchoring section (5A), free segment (5B) and outer anchor section (5C), anchoring section (5A) is connected with free segment (5B), and free segment (5B) is connected with outer anchor section (5C).
4. according to a kind of large deformation prestressed anchor described in right 1, it is characterized in that: the described band cap cylindrical shell (1) that cracks comprises cylindrical shell (1A), segmental arc (1B), wing plate (1C) and the wing along (1D), cylindrical shell (1A) is connected with segmental arc (1B), segmental arc (1B) is connected with wing plate (1C), and wing plate (1C) is connected along (1D) with the wing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310610440.4A CN103603684B (en) | 2013-11-26 | 2013-11-26 | A kind of large deformation prestressed anchor |
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| CN201310610440.4A CN103603684B (en) | 2013-11-26 | 2013-11-26 | A kind of large deformation prestressed anchor |
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| CN103603684A true CN103603684A (en) | 2014-02-26 |
| CN103603684B CN103603684B (en) | 2016-07-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110700255A (en) * | 2019-10-15 | 2020-01-17 | 中山大学 | Snake-shaped armor anchor rod and construction method thereof |
| CN112664249A (en) * | 2020-11-30 | 2021-04-16 | 绍兴文理学院 | Let and press multistage big deformation stock that bears of adjustable length |
| CN114135314A (en) * | 2021-11-12 | 2022-03-04 | 中铁大桥局集团有限公司 | Method for improving flatness of tunnel primary sprayed concrete |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04368598A (en) * | 1991-06-17 | 1992-12-21 | Mitsui Constr Co Ltd | Fixing method for synthetic fiber bar body solidified by synthetic resin |
| CN2702056Y (en) * | 2004-06-04 | 2005-05-25 | 王永伯 | Anchor |
| CN102828760A (en) * | 2012-09-05 | 2012-12-19 | 淮南市顺辉锚固有限公司 | Pre-stress spiral rib hollow grouting anchor rope |
| CN203230446U (en) * | 2013-05-16 | 2013-10-09 | 黑龙江科技大学 | Expansion-shell prestressed coal mine energy-absorption shoring anchor rod |
-
2013
- 2013-11-26 CN CN201310610440.4A patent/CN103603684B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04368598A (en) * | 1991-06-17 | 1992-12-21 | Mitsui Constr Co Ltd | Fixing method for synthetic fiber bar body solidified by synthetic resin |
| CN2702056Y (en) * | 2004-06-04 | 2005-05-25 | 王永伯 | Anchor |
| CN102828760A (en) * | 2012-09-05 | 2012-12-19 | 淮南市顺辉锚固有限公司 | Pre-stress spiral rib hollow grouting anchor rope |
| CN203230446U (en) * | 2013-05-16 | 2013-10-09 | 黑龙江科技大学 | Expansion-shell prestressed coal mine energy-absorption shoring anchor rod |
Non-Patent Citations (1)
| Title |
|---|
| 李铀等: "一种适用于大变形支护的新型可伸长锚杆", 《中南公路工程》, vol. 32, no. 2, 20 April 2007 (2007-04-20), pages 103 - 105 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110700255A (en) * | 2019-10-15 | 2020-01-17 | 中山大学 | Snake-shaped armor anchor rod and construction method thereof |
| CN112664249A (en) * | 2020-11-30 | 2021-04-16 | 绍兴文理学院 | Let and press multistage big deformation stock that bears of adjustable length |
| CN112664249B (en) * | 2020-11-30 | 2022-02-01 | 绍兴文理学院 | Let and press multistage big deformation stock that bears of adjustable length |
| CN114135314A (en) * | 2021-11-12 | 2022-03-04 | 中铁大桥局集团有限公司 | Method for improving flatness of tunnel primary sprayed concrete |
| CN114135314B (en) * | 2021-11-12 | 2023-09-26 | 中铁大桥局集团有限公司 | Method for improving flatness of tunnel primary spraying concrete |
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| CN103603684B (en) | 2016-07-20 |
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