CN103603684B - A kind of large deformation prestressed anchor - Google Patents
A kind of large deformation prestressed anchor Download PDFInfo
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- CN103603684B CN103603684B CN201310610440.4A CN201310610440A CN103603684B CN 103603684 B CN103603684 B CN 103603684B CN 201310610440 A CN201310610440 A CN 201310610440A CN 103603684 B CN103603684 B CN 103603684B
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Abstract
The invention discloses a kind of large deformation prestressed anchor, including stitched open band cap cylinder, taper wedge, pad, locking nut, anchor rod body, anchor rod body sequentially passes through stitched open band cap cylinder, taper wedge, pad, locking nut, stitched open band cap cylinder embeds drilling orifice, stitched open band cap cylinder and taper wedge are matched by CONTACT WITH FRICTION, stitched open band cap cylinder is inserted in taper wedge front end, and pad and locking nut are locked from outside.Anchor rod body is threaded solid reinforcing bar or hollow steel pipe, and anchor rod body one end is Flos Cannabis type or linear type, is sinusoidal waveform profile type in the middle part of anchor rod body, and the anchor rod body other end is with external screw thread.Simple in construction, easy to operate, deformability is strong, has anti-loose function, and work mechanical property is good, and cost is low, it is easy to processing, easy for installation, is particularly suitable for the underground engineering such as colliery, tunnel.
Description
Technical field
The present invention relates to Geotechnical Engineering anchorage technology field, it is more particularly to a kind of large deformation prestressed anchor, suitable in colliery, vcehicular tunnel and slope project, and other relates to the Geotechnical Engineering of soft rock mass anchoring support, certain anchor force can be kept when country rock produces moderate finite deformation, be conducive to the lasting security of anchoring support system and effective.
Background technology
Being frequently encountered the support issues of weak surrounding rock in the production of the deep-buried underground engineering such as colliery, tunnel and process of construction, owing to soft rock deforms greatly under high-ground stress effect, and the persistent period is long, therefore supporting measure is had higher requirement.At present, through reinforcing country rock frequently with the mode of the bolt support in engineering, but existing anchor pole usual suitable for surrounding rock deformability is more weak, or provide anchor force less, when soft rock mass deflection is big, very easily cause the inefficacy of anchor adhesive the junction unsticking, Bolted Rock Masses body surrender etc., making anchor rod anchored ability be substantially reduced and lose efficacy, and then cause surrouding rock stress quickly to adjust, energy release of surrounding rock speed is fast, cause supporting construction to damage, burst accident easily occurs.And existing anchor pole in use often causes getting loose due to the effect of blasting vibration load and Cyclic Loading, reduce the anchoring ability of anchor pole.Therefore, it is 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, having following result about large deformation prestressed anchor:
Rely deserved (several Extendable anchor rods [J], coal mining, 1998,3:49-50) Extendable anchor rod being carried out statistical analysis, total snake type telescopic anchoring-bolt, sleeve friction formula Extendable anchor rod, aperture spring compression type can relax elongate bolt, body of rod elongation and aperture compression Extendable anchor rod, plastic 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] suitable in Large Deformation Support, Central-South highway engineering, 2007,32 (2): 103-105,127) propose a kind of sleeve friction-type large deformation anchor rod, all there is stronger deformability.Time court (Extendable anchor rod principle and application, northeast colliery engineering, 1995,5:21-25,32) propose a kind of H type body of rod and afterbody modified model Extendable anchor rod.Wu Dexing (patent No.: 200610051809.2, patent name: a kind of prestress anchor device) proposes a kind of prestress anchor device, and once grouting can realize anchoring section and free segment mortar depositing construction, but structure is complex.Qin Weimin (patent No.: 03128107.9 patent name: a kind of sand consolidated anchorage prestressed bolt and anchoring process thereof) proposes the manufacture method of a kind of sand consolidated anchorage prestressed bolt, improves success rate and the anchoring ability of sand consolidation anchor pole.
Except studying above and achievement, end retrieves the research about large deformation prestressed anchor and also has a lot with product, but owing to structure is complicated, anchoring effect is poor and is not easy to the reasons such as construction, these anchor poles all ends are widely applied in engineering.
Summary of the invention
It is an object of the invention to there are provided a kind of large deformation prestress anchor device, simple in construction, easy to operate, deformability is strong, having anti-loose function, work mechanical property is good, and cost is low, it is prone to processing, easy for installation, it is particularly suitable for the underground engineering such as colliery, tunnel.
In order to achieve the above object, the present invention adopts the following technical scheme that
A kind of large deformation prestressed anchor being adaptable to weak surrounding rock, including stitched open band cap cylinder, taper wedge, pad, locking nut, anchor rod body.It is characterized in that: anchor rod body sequentially passes through stitched open band cap cylinder, taper wedge, pad, locking nut, stitched open band cap cylinder embeds drilling orifice, stitched open band cap cylinder and taper wedge are matched by CONTACT WITH FRICTION, stitched open band cap cylinder is inserted in taper wedge front end, is finally locked by locking nut.Anchor rod body is threaded solid reinforcing bar or hollow steel pipe, and anchor rod body one end is Flos Cannabis type or linear type, as anchoring section；It is sinusoidal waveform profile type in the middle part of anchor rod body, can stretch after anchor rod body stress, increase anchor rod body deformability；The anchor rod body other end, with external screw thread, applies pretightning force by tightening nut.Stitched open band cap cylinder is made up of 6～8mm steel sheet and plate, and cylinder body bottom leaves the hole of anchor rod body traverse.Segmental arc central angle is between 100 °～120 °, and its effect is to play cushioning effect after anchor pole bears axle power, it is prevented that anchor rod body gets loose when being subject to Cyclic Loading and oscillatory load effect；The wing plate of stitched open band cap cylinder primarily serves pressure-bearing effect, is adapted to different pressure-bearing needs by adjusting its radius size；The wing of stitched open band cap cylinder becomes to upwarp shape along partial design, it is possible to after stitched open band cap cylinder stress, slides along country rock right in the face.The processing of stitched open band cap cylinder has a longitudinal joint, makes taper wedge can slip into cylinder under certain pressure effect.Stitched open band cap cylinder on the one hand and the combination of taper wedge, is provided the moderate finite deformation of anchor pole, also acts as the effect of bearing plate on the other hand by taper wedge Frictional Slipping in cylinder.Taper wedge is formed by lathe process by round steel, leaving the cavity of anchor rod body traverse in it, taper wedge one end diameter is slightly less than the barrel diameter of stitched open band cap cylinder, and other end diameter is greater than cylinder, by adjusting the diameter of taper wedge, it is possible to obtain different anchor pole working resistances.
Forming because large deformation prestressed anchor elongation is stretched part, barrel lenght part and the ductility elongated portion of the body of rod own by anchor pole curved portion, therefore large deformation prestressed anchor deflection is much larger than tradition prestressed anchor.The length of waveform number and cylinder by adjusting anchor pole curved section, is almost adapted to various weak surrounding rock anchoring needs.
The anchoring process of the present invention, the steps include:
A, employing rig get out rockbolt installation hole, and landwaste in hole and dust are rinsed well, if aperture country rock has cave in, cement mortar should be adopted to mend circular, if aperture country rock wall out-of-flatness, should adopt cement screeding.Anchor Agent (accelerated cement powder stick or resin explosive roll) is pushed at the bottom of hole after being ready to by boring；
B, boring are rotatably inserted into anchor rod body after being ready to, and insert after at the bottom of hole, and anchor rod body should rotate 1-3 minute, to ensure that Anchor Agent is with anchor rod body bonding uniformly, in the process, should ensure that the body of rod is positioned at boring centre position；
C, stitched open band cap cylinder is penetrated on anchor pole, and cylinder is pushed in boring, and ensure that cylinder body outer wall contacts well with country rock, be absent from big hole；
D, on anchor rod body, penetrate taper wedge, pad and locking nut successively, taper wedge front end should with stitched open band cap cylinder centering enter cylinder a little (5～10mm), then rotational lock nut forms certain pretightning force, (time is determined) after design strength is reached by used rapid solidification anchor agent performance until Anchor Agent, rotational lock nut makes anchor pole reach the pretightning force of design, is controlled the degree of tightness of locking nut in this process by digital display type torque wrench.
Compared with prior art, present invention have the advantage that
(1) deformability is strong.Large deformation prestressed anchor has bigger elongation strain ability, bolt deformation includes barrel lenght part, body of rod curved section elongates partly and the ductility elongated portion of anchor pole itself, by adjusting barrel lenght and body of rod curved section length, it is suitable for various weakness, breaking surrounding rock.
(2) there is anti-loose function.The segmental arc of large deformation prestressed anchor stitched open band cap cylinder and wing plate design can play cushioning effect after rockbolt stress, to prevent anchor pole from getting loose when oscillatory load and reciprocating load,
(3) work mechanical property is good.After rockbolt installation, with country rock shape, anchor-holding force of anchor bolt is gradually increased, when reaching curved section and stretching required load, anchor pole curved section starts elongation, anchor force continues to increase, and after curved section is straightened, increases with anchor force, taper wedge initially enters anchor pole cylinder, anchor-holding force of anchor bolt keeps constant, until taper wedge arrives cylinder body bottom, continues to increase with anchor force, then the body of rod is elongated entrance ductility and destroys, in this course, anchor pole experienced by the different phase of anchor force increase-increase-constant-increase, is particularly suitable for the supporting demand of weak surrounding rock.
(4) large deformation prestressed anchor adopts the material such as regular screw threads reinforcing bar and steel plate to make, less costly, it is easy to processing, easy for installation, is particularly suitable for the underground engineering such as colliery, tunnel.
Fig. 1 is present invention model large deformation prestressed anchor and tradition prestressed anchor drawing empirical curve contrast, it can be seen that prestressed anchor elongation of the present invention can reach more than 30cm, considerably beyond the elongation of tradition prestressed anchor.
Accompanying drawing explanation
Fig. 1 is certain model large deformation prestressed anchor and tradition 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 that one drives stitched open band cap tube structure schematic diagram, and wherein Fig. 3 A is side view, and Fig. 3 B is top view.
Fig. 5 is a kind of rockbolt installation construction drawing.
Wherein: 1 be stitched open band cap cylinder, 2 be taper wedge, 3 be pad, 4 be locking nut, 5 be anchor rod body, 1A to be cylinder, 1B be segmental arc, 1C is wing plate, 1D be the wing along, 5A to be the outer anchor section of anchor rod body, 5B be anchor rod body free segment, 5C is anchor rod body anchoring section, Anchor Agent 6, boring 7.
Detailed description of the invention
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, comprise stitched open band cap cylinder 1, taper wedge 2, pad 3, locking nut 4, anchor rod body 5.Anchor rod body 5 sequentially passes through stitched open band cap cylinder 1, taper wedge 2, pad 3, locking nut 4, stitched open band cap cylinder 1 embeds drilling orifice, stitched open band cap cylinder 1 and taper wedge 2 are matched by CONTACT WITH FRICTION, stitched open band cap cylinder 1 is inserted in taper wedge 2 front end, is finally locked from outside by pad 3 and locking nut 4.
From the figure 3, it may be seen that 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 and outer anchor section 5C connects, and actual is that a body of rod processes.Free segment is that anchor pole is positioned at the non-bonded section of boring.
By Fig. 4 and Fig. 5 it can be seen that stitched open band cap cylinder 1 comprises cylinder 1A, segmental arc 1B, wing plate 1C and the wing along 1D.Cylinder 1A and segmental arc 1B is smoothly connected, and segmental arc 1B and wing plate 1C is smoothly connected, and wing plate 1C and the wing are smoothly connected along 1D.Stitched open band cap cylinder 1, with a longitudinal joint, makes taper wedge can slip into cylinder under certain pressure effect.nullAfter boring 7 gets out，Landwaste in hole and dust are rinsed well，And by aperture country rock wall filling-in、Aperture collapse hole part is circular，By Anchor Agent 6(accelerated cement powder stick or resin explosive roll) it is pushed at the bottom of hole，It is rotatably inserted into anchor rod body 5 under rig drives，Insert after at the bottom of hole，Rotate anchor rod body 5 and answer 1-3 minute，Make guarantee anchor rod body 5 should be positioned in the middle of boring 7 simultaneously，Subsequently stitched open band cap cylinder 1 is penetrated on anchor rod body 5，And cylinder 1A is pushed in boring 6，And ensure that cylinder 1A outer wall contacts well with country rock，Then on anchor rod body 5, penetrate taper wedge 2 successively、Pad 3 and locking nut 4，By taper wedge front end and stitched open band cap cylinder 1 centering and push cylinder 1A，Rotational lock nut 4 forms certain pretightning force，After Anchor Agent 6 reaches design strength，Using digital display type torque wrench to screw locking nut 4 makes anchor pole reach the pretightning force of design.
Claims (2)
1. a large deformation prestressed anchor, including stitched open band cap cylinder (1), taper wedge (2), pad (3), locking nut (4), anchor rod body (5), it is characterized in that: anchor rod body (5) sequentially passes through stitched open band cap cylinder (1), taper wedge (2), pad (3), locking nut (4), stitched open band cap cylinder (1) embeds drilling orifice, stitched open band cap cylinder (1) and taper wedge (2) are matched by CONTACT WITH FRICTION, stitched open band cap cylinder (1) is inserted in taper wedge (2) front end, pad (3) and locking nut (4) are locked from outside；Described anchor rod body (5) is threaded solid reinforcing bar or hollow steel pipe, and anchor rod body (5) one end is Flos Cannabis type or linear type, and anchor rod body (5) middle part is sinusoidal waveform profile type, and anchor rod body (5) other end is with external screw thread；Described stitched open band cap cylinder (1) comprises cylinder (1A), segmental arc (1B), wing plate (1C) and wing edge (1D), cylinder (1A) is connected with segmental arc (1B), segmental arc (1B) is connected with wing plate (1C), and wing plate (1C) and the wing connect along (1D)；Anchor rod body (5) is bondd in the borehole by Anchor Agent (6).
2. a kind of large deformation prestressed anchor according to claim 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) and outer anchor section (5C) connect.
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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 CN103603684A (en) | 2014-02-26 |
| CN103603684B true CN103603684B (en) | 2016-07-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110700255B (en) * | 2019-10-15 | 2020-06-30 | 中山大学 | Snake-shaped armor anchor rod and construction method thereof |
| 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 |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| 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 |
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- 2013-11-26 CN CN201310610440.4A patent/CN103603684B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| 一种适用于大变形支护的新型可伸长锚杆;李铀等;《中南公路工程》;20070420;第32卷(第2期);第103-105页 * |
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