CN202007678U - Coal mine tension dispersion anchor rope - Google Patents
Coal mine tension dispersion anchor rope Download PDFInfo
- Publication number
- CN202007678U CN202007678U CN 201120085478 CN201120085478U CN202007678U CN 202007678 U CN202007678 U CN 202007678U CN 201120085478 CN201120085478 CN 201120085478 CN 201120085478 U CN201120085478 U CN 201120085478U CN 202007678 U CN202007678 U CN 202007678U
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- anchoring
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- anchoring sections
- anchor cable
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Abstract
The utility model discloses a coal mine tension dispersion anchor rope, which comprises an anchor head section, a free section and anchoring sections, and is characterized in that different anchoring sections adopt anchoring agent with different curing time along the direction of drilling depth, so that the anchoring agent placed at the same time on the different anchoring sections completes curing at different time, the anchoring agent positioned on the inner anchoring sections closer to the bottom position of a drilled hole completes curing firstly, and the anchoring agent positioned on the outer anchoring sections closer to the orifice position of the drill hole and adjacent to the drill hole completes curing late for 10-20 hours. By the aid of the coal mine tension dispersion anchor rope, stability and safety of a roadway support can be improved effectively.
Description
Technical field
The utility model relates to the used anchor cable of coal mine support.
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 the upgrading of coal mining technology and 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 research application 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 by 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, generally the anchor cable of Shi Yonging belongs to pulling force concentrated anchor cable.Also anchoring section A, a free section B and an anchor head section C who exposes of anchoring form the anchor structure of pulling force concentrated anchor cable by an interior at one time curing, 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 once complete whole anchorings of anchoring section in a boring to finish.
Studies show that the distribution of pulling force concentrated anchor cable bonding shear stress is uneven, and has only the anchoring section of partial-length stressed; In the original position bonding shear stress maximum of anchorage cable anchoring section, 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;
3, the information of distortion being provided for the roadway support design personnel causes installation quantity or the safety that improves roadway support of the diameter that increases anchor cable by increasing anchor cable of attempt in designer's supporting design afterwards;
4, increase the roadway support material cost.
The utility model content
The utility model 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 of safety.
The utility model technical solution problem adopts following technical scheme:
The utility model colliery pulling force dispersed anchor cable is to be made of anchor head section, free section and anchoring section, it is characterized in that described anchoring section at it along on the different anchoring sections on the drilling depth direction, employing has the anchoring agent of different hardening times, so that the anchoring agent that the same time inserts on described different anchoring sections is finished curing in the 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 and finished curing in 10～20 hours with it.
Compared with the prior art, the utility model beneficial effect is embodied in:
1, the utility model is owing to use the different anchoring agent of curing rate, by corresponding with it erection sequence is set, the anchoring agent that is implemented in different anchoring sections in the same boring is to finish the curing anchoring in the different periods, thereby realize 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 utility model 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 stir and to finish, thereby realize the novel pulling force dispersed anchor cable in small-bore once mounting, stir and finish, and can segmentation, the timesharing anchoring.
Description of drawings
Fig. 1 a is the anchor structure schematic diagram of pulling force concentrated anchor cable in the prior art.
Fig. 1 b is the bonding shearing stress distribution schematic diagram of the anchor cable of pulling force concentrated shown in Fig. 1 a.
Fig. 2 a is the utility model structural representation.
Fig. 2 b is the utility model anchoring section shearing stress distribution schematic diagram.
The specific embodiment
Referring to Fig. 2 a and Fig. 2 b, present embodiment is to be made 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, so that the anchoring agent that the same time inserts on different anchoring sections is finished curing in the 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 and finished curing in 10～20 hours with it.
In the concrete enforcement of the utility model, 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, finish the anchoring agent of curing in inserting on the anchoring sections A1 position, the anchoring agent that lags behind and finished curing in 10～20 hours on the sections of the place's of the inserting anchoring immediately A2 position in advance in advance;
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 finished 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 finishing 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 anchored force, the anchored force at interior anchoring sections A1 place still can increase along with the increase of roof pressure, until reaching its maximum anchored force;
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 (2)
1. colliery pulling force dispersed anchor cable is made of anchor head section, free section and anchoring section, it is characterized in that described anchoring section at it along on the different anchoring sections on the drilling depth direction, adopt anchoring agent with different hardening times; And that be in position at the bottom of the more approaching boring hole is the interior anchoring sections A1 that the anchoring agent is solidified in advance; Be in more near the drilling orifice position, with described in anchoring sections A1 adjacent be to lag behind to finish the outer anchoring sections A2 of curing.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120085478 CN202007678U (en) | 2011-03-25 | 2011-03-25 | Coal mine tension dispersion anchor rope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120085478 CN202007678U (en) | 2011-03-25 | 2011-03-25 | Coal mine tension dispersion anchor rope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202007678U true CN202007678U (en) | 2011-10-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120085478 Expired - Lifetime CN202007678U (en) | 2011-03-25 | 2011-03-25 | Coal mine tension dispersion anchor rope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202007678U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116162A (en) * | 2011-03-25 | 2011-07-06 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Tension dispersed anchor cable for coal mine and anchoring method thereof |
-
2011
- 2011-03-25 CN CN 201120085478 patent/CN202007678U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116162A (en) * | 2011-03-25 | 2011-07-06 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Tension dispersed anchor cable for coal mine and anchoring method thereof |
| CN102116162B (en) * | 2011-03-25 | 2012-07-25 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Tension dispersed anchor cable for coal mine and anchoring method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111012 Effective date of abandoning: 20120725 |