CN102116162B - Tension dispersed anchor cable for coal mine and anchoring method thereof - Google Patents
Tension dispersed anchor cable for coal mine and anchoring method thereof Download PDFInfo
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- CN102116162B CN102116162B CN2011100755741A CN201110075574A CN102116162B CN 102116162 B CN102116162 B CN 102116162B CN 2011100755741 A CN2011100755741 A CN 2011100755741A CN 201110075574 A CN201110075574 A CN 201110075574A CN 102116162 B CN102116162 B CN 102116162B
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Abstract
The invention discloses a tension dispersed anchor cable for a coal mine and an anchoring method thereof, which consists of an anchor head section, a free section, and an anchoring section. The invention is characterized in that anchoring agents with different hardening times are adopted on different anchoring segments of the anchoring section along the depth direction of the drilled hole of the anchoring section; therefore, the anchoring agents injected on different anchoring segments at the same time are completely hardened at different time; moreover, the anchoring agents on the inner anchoring segments closer to the bottom part of the drilled hole are hardened firstly; and the anchoring agents on the outer anchoring segments neighboring with the inner anchoring segments closer to the mouth of the drilled hole are completely hardened in 10-20 hours lately. The invention can effectively improve the stability and safety of roadway supports.
Description
Technical field
The present invention relates to used anchor cable of coal mine support and anchoring process thereof.
Background technology
Along with the deepening of the construction of coal mine and the level of production, coal mine roadway ground is pressed and is increased; Along with of the upgrading of coal mining technology with equipment, the corresponding increase of coal mine roadway section, cable bolting becomes indispensable important supporting means in highland, colliery pressure, the large section roadway just day by day.The colliery cable bolting changes a kind of short-term supporting and the common supporting means that adopt of long-term supporting into from a kind of short-term supporting means at its Application Research initial stage, promotes the use of supporting long term service tunnel, promotes the use of supporting rock gangway even soft-rock tunnel from the supporting coal road from supporting short-term service tunnel.
Yet the anchor structure of coal mine roadway cable bolting and technology but do not have along with the great change that coal mine roadway cable bolting object and condition took place to be transformed to some extent.Can find that through analyzing colliery anchorage cable anchoring technology exists certain systematic defect, existing anchorage cable anchoring technology exists certain system risk for the stability and the safety of colliery tunnel support.
According to the difference of bearing mode, anchor cable can be divided into pulling force concentrated anchor cable, pressure concentrated anchor cable, pulling force dispersed anchor cable, pressure dispersing anchorage cable and tension and compression mixed type anchor cable etc.In colliery tunnel support, the anchor cable that generally uses belongs to pulling force concentrated anchor cable.The anchor structure of pulling force concentrated anchor cable is made up of the interior at one time anchoring section A of also anchoring, a free section B and the anchor head section C who exposes of solidifying; Shown in Fig. 1 a and Fig. 1 b; Adopt the identical same a kind of anchoring agent of curing performance its anchoring section A is anchored in the country rock boring, use the identical same a kind of anchoring agent of curing performance whole anchorings of once full anchoring section in a boring to accomplish.
Research shows that the distribution of pulling force concentrated anchor cable bonding shear stress is uneven, and has only the anchoring section of partial-length stressed; Original position bonding shear stress in the anchorage cable anchoring section is maximum, and to anchoring section deep direction, anchor cable bonding shear stress is exponential curve and decays rapidly; In the outer end of anchoring section, promptly can produce serious tensile stress concentration phenomenon on the original position of anchoring section; Because anchorage cable anchoring power is far below the Fracture Force of its steel strand, thus the destruction that anchoring in the anchor cable will take place in lower anchored force level.Traditional prestress anchorage cable belongs to this type more, and the employed anchorage cable anchoring structure of colliery tunnel support all belongs to this type at present.
The inefficacy of cable bolting and destruction belong to recessive the inefficacy and destroy with recessive; And existing monitoring technology is difficult in time find the destruction of anchoring in the anchor cable; Cause thus in recent years that the coal mine roadway roof fall accident constantly takes place, bring serious threat, be in particular in to the colliery safety in production:
1, the anchor cable working condition gets on intactly outwardly, but absciss layer and sedimentation take place top board, and the interior anchor that shows anchor cable has taken place loosening or got loose.
2, anchor cable and cementing medium or hole wall between produce shear failure after loosening taking out take off, top board may the situation that anchor is intact anchor cable outside under the serious absciss layer of generation or collapse;
The information of 3, distortion being provided for the roadway support design personnel, the safety that causes installation quantity or the diameter that increases anchor cable through increasing anchor cable of attempt in designer's supporting design afterwards to improve roadway support;
4, increase the roadway support material cost.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point; Provide a kind of anchoring section bonding shearing stress distribution more even; The anchorage cable anchoring section effectively utilizes length longer, can effectively improve the stability of roadway support and the colliery pulling force dispersed anchor cable and the supporting method thereof of safety.
Technical solution problem of the present invention adopts following technical scheme:
Colliery of the present invention pulling force dispersed anchor cable is to be made up of anchor head section, free section and anchoring section; It is characterized in that said anchoring section at it along on the different anchoring sections on the drilling depth direction; Employing has the anchoring agent of different hardening times, solidifies so that the anchoring agent that the same time inserts on said different anchoring sections is accomplished in different time; And the anchoring agent that is in the interior anchoring sections of position at the bottom of the more approaching boring hole is solidified in advance, is in more near the drilling orifice position, the anchoring agent on the adjacent outer anchoring sections lags behind to accomplish in 10～20 hours and solidifies with it.
The characteristic of the anchoring process of colliery of the present invention pulling force dispersed anchor cable is to carry out as follows:
A, adopt each anchor cable hole that the anchor cable hole, small-bore of an anchor cable only is installed;
B, in anchor cable hole, said small-bore, insert the anchoring agent, accomplish the anchoring agent of solidifying in advance in inserting on the anchoring sections A1 position in advance, inserting immediately lags behind on the outer anchoring sections A2 position accomplished the anchoring agent of curing in 10～20 hours;
C, installation steel strand, and with the stirring duration of steel strand continuous stirring anchoring agent to regulation;
D, treat in the locational anchoring agent of anchoring sections A1 when solidifying fully, ground tackle is installed and is carried out pretension and be stretched to the design stretching force;
E, the anchoring agent of waiting for outer anchoring sections A2 position lag behind and accomplished curing fully in 10～20 hours.
Compared with present technology, beneficial effect of the present invention is embodied in:
1, the present invention is owing to use the different anchoring agent of curing rate; Through corresponding with it erection sequence is set, the anchoring agent that is implemented in different anchoring sections in the same boring is in the different periods, to accomplish to solidify anchoring, thereby realizes segmented, the timesharing anchoring of anchor cable; That has improved anchoring section in the anchor cable effectively utilizes length; Disperse and the even distribution of anchorage cable anchoring section shear stress, reduced the bonding shear stress peak value of anchor cable, improved the anchored force and the supporting intensity of anchor cable.
2, the present invention according to short anchoring agent hardening time the anchoring agent preceding, that lag behind hardening time after order the anchorage cable anchoring agent is installed; The anchoring agent once mounting of two or more different curing rates, once stirring completion; Thereby realize the novel pulling force dispersed anchor cable in small-bore once mounting, stir and accomplish, and can segmentation, the timesharing anchoring.
The drawing explanation
Fig. 1 a is the anchor structure sketch map of pulling force concentrated anchor cable in the prior art.
Fig. 1 b is the bonding shearing stress distribution sketch map of pulling force concentrated anchor cable shown in Figure 1.
Fig. 2 a is a structural representation of the present invention.
Fig. 2 b is an anchoring section shearing stress distribution sketch map of the present invention.
The specific embodiment
Referring to Fig. 2 a and Fig. 2 b; Present embodiment is to be made up of anchor head section C, free section B and anchoring section A; Anchoring section A at it along on the different anchoring sections on the drilling depth direction; Employing has the anchoring agent of different hardening times, solidifies so that the anchoring agent that the same time inserts on different anchoring sections is accomplished in different time; And the anchoring agent that is in the interior anchoring sections A1 of position at the bottom of the more approaching boring hole is solidified in advance, is in more near the drilling orifice position, the anchoring agent on the adjacent outer anchoring sections A2 lags behind to accomplish in 10～20 hours and solidifies with it.
In the practical implementation of the present invention, interior anchoring sections A1 was generally 1: 1 with the length ratio of outer anchoring sections A2, but the length of interior anchoring sections A1 should be not less than 1 meter.Interior anchoring sections adopts middling speed anchoring agent, and outer anchoring sections adopts retardation setting type anchoring agent, and the initial solidification time of retardation setting type anchoring agent is 12～16 hours, and be 24 hours final hardening time.
The anchoring process:
1, adopt each anchor cable hole that the anchor cable hole, small-bore of an anchor cable only is installed;
2, in the anchor cable hole, insert the anchoring agent, accomplish the anchoring agent of solidifying in advance in inserting on the anchoring sections A1 position in advance, lag behind on the sections of the place's of the inserting anchoring immediately A2 position and accomplished the anchoring agent of solidifying in 10～20 hours;
3, steel strand are installed, simultaneously with the stirring duration of steel strand continuous stirring anchoring agent to regulation;
4, treat in the locational anchoring agent of anchoring sections A1 when solidifying fully, ground tackle is installed and is carried out pretension and be stretched to the design stretching force;
5, the anchoring agent of waiting for outer anchoring sections A2 position lags behind and accomplished curing fully in 10～20 hours.
Load bearing process:
At the installation initial stage, the anchoring agent at outer anchoring sections A2 place does not stress owing to not accomplishing to solidify, and the anchored force of anchor cable all results from interior anchoring sections A1 position;
Along with the increase of roof pressure, the anchored force of anchoring section will increase thereupon on the anchor cable;
After the anchoring agent at the outer anchoring sections A2 place of anchor cable is solidified anchoring fully; And the load that top board acts on anchor cable is during greater than the anchored force at interior anchoring sections A1 place; The anchored force at outer anchoring sections A2 place begins to produce and increase, at this moment, and not stressed can not the increasing at interior anchoring sections A1 place;
When load that top board acts on anchor cable greater than outside the anchored force at anchoring sections A2 place; And in the anchored force at anchoring sections A1 place when not reaching its maximum anchorage power; The anchored force at interior anchoring sections A1 place still can increase along with the increase of roof pressure, until reaching its maximum anchorage power;
All after the anchoring work, the anchored force of anchor cable equals the anchored force sum of interior anchoring sections A1 position and outer anchoring sections A2 position at interior anchoring sections A1 place and outer anchoring sections A2 place.
Claims (3)
1. colliery pulling force dispersed anchor cable; Constitute by anchor head section, free section and anchoring section; It is characterized in that said anchoring section at it along on the different anchoring sections on the drilling depth direction; Employing has the anchoring agent of different hardening times, solidifies so that the anchoring agent that the same time inserts on said different anchoring sections is accomplished in different time; And the anchoring agent that is in the interior anchoring sections A1 of position at the bottom of the more approaching boring hole is solidified in advance, is in more near the drilling orifice position, the anchoring agent on the adjacent outer anchoring sections A2 lags behind to accomplish in 10～20 hours and solidifies with it.
2. colliery according to claim 1 pulling force dispersed anchor cable, anchoring sections A1 is 1: 1 with the length ratio of outer anchoring sections A2 in it is characterized in that, interior anchoring sections A1 length should be not less than 1 meter.
3. the anchoring process of the said colliery of claim 1 a pulling force dispersed anchor cable is characterized in that carrying out as follows:
A, adopt each anchor cable hole that the anchor cable hole, small-bore of an anchor cable only is installed;
B, in anchor cable hole, said small-bore, insert the anchoring agent, accomplish the anchoring agent of solidifying in advance in inserting on the anchoring sections A1 position in advance, inserting immediately lags behind on the outer anchoring sections A2 position accomplished the anchoring agent of curing in 10～20 hours;
C, installation steel strand, and with the stirring duration of steel strand continuous stirring anchoring agent to regulation;
D, treat in the locational anchoring agent of anchoring sections A1 when solidifying fully, ground tackle is installed and is carried out pretension and be stretched to the design stretching force;
E, the anchoring agent of waiting for outer anchoring sections A2 position lag behind and accomplished curing fully in 10～20 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100755741A CN102116162B (en) | 2011-03-25 | 2011-03-25 | Tension dispersed anchor cable for coal mine and anchoring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100755741A CN102116162B (en) | 2011-03-25 | 2011-03-25 | Tension dispersed anchor cable for coal mine and anchoring method thereof |
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| CN102116162A CN102116162A (en) | 2011-07-06 |
| CN102116162B true CN102116162B (en) | 2012-07-25 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865088B (en) * | 2012-09-12 | 2015-04-08 | 山东科技大学 | Tension and compression coupling type high-strength and high-deformation anchor rod and method for using same |
| CN108104852B (en) * | 2017-12-18 | 2019-05-14 | 中国矿业大学 | A kind of low stretch-draw anchor construction method reducing loss of prestress |
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| WO2006034208A1 (en) * | 2004-09-20 | 2006-03-30 | Atlas Copco Mai Gmbh | An elongate element tensioning member |
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2011
- 2011-03-25 CN CN2011100755741A patent/CN102116162B/en active Active
Patent Citations (7)
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| GB596408A (en) * | 1945-05-25 | 1948-01-02 | Zako Sytse Beijl | Improvements relating to tunnelling and like subterranean operations |
| CN2051672U (en) * | 1989-06-23 | 1990-01-24 | 煤炭科学研究总院南京研究所 | Tensible device of anchor shank |
| CN2141466Y (en) * | 1992-08-19 | 1993-09-01 | 兖州矿务局科研所 | Rocoverable quick fixing metal anchor rod |
| CN2161730Y (en) * | 1993-01-19 | 1994-04-13 | 成恒棠 | Multi-section anchoring-bolt fastening device |
| WO2006034208A1 (en) * | 2004-09-20 | 2006-03-30 | Atlas Copco Mai Gmbh | An elongate element tensioning member |
| CA2520793A1 (en) * | 2004-09-24 | 2006-03-24 | Jennmar Corporation | Point anchor coated mine roof bolt |
| CN202007678U (en) * | 2011-03-25 | 2011-10-12 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Coal mine tension dispersion anchor rope |
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| 丁瑜 |
| 丁瑜;王全才;何思明.拉力分散型锚索锚固段荷载传递机制.《岩土力学》.2010,(第2期), * |
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