CN111648804A - Resistance-increasing deformation anchor cable for deep yielding support and assembling and working method - Google Patents
Resistance-increasing deformation anchor cable for deep yielding support and assembling and working method Download PDFInfo
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- CN111648804A CN111648804A CN202010526061.7A CN202010526061A CN111648804A CN 111648804 A CN111648804 A CN 111648804A CN 202010526061 A CN202010526061 A CN 202010526061A CN 111648804 A CN111648804 A CN 111648804A
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- 238000005553 drilling Methods 0.000 claims description 26
- 239000004744 fabric Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
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Abstract
The invention discloses a resistance-increasing deformation anchor cable for deep yielding support and an assembly and working method thereof.A front anchor cable and a rear anchor cable are arranged in a tensile sleeve with a radius at intervals, and the outer ends of the front anchor cable and the rear anchor cable are respectively anchored at the bottom of a hole and an orifice after being respectively exposed from a reducing section and an equal-diameter section of the tensile sleeve; the tail part of the front end anchor cable is sleeved with a wedge-shaped extrusion anchor sliding body, the front end of the tail anchor cable is sleeved with an extrusion anchor fixing body with external threads, and the front end anchor cable position of the outer wall of the tensile sleeve is provided with a resistance-increasing hoop. The support force of the resistance-increasing deformation anchor cable is gradually increased along with the extension deformation of the whole structure so as to resist higher surrounding rock load, when the surrounding rock load gathers to exceed the existing support force, the anchor cable continues to extend and deform, and simultaneously the support force is increased again, and the surrounding rock deformation is always in the deformation control range in the process.
Description
Technical Field
The invention belongs to the field of underground engineering support, and particularly relates to a resistance-increasing deformation anchor cable for deep yielding support and a construction method thereof.
Background
With the depletion of the front resources, deep mining is a necessary trend. After entering the deep part, the surrounding rock is influenced by high ground pressure, strong rheology, easy disturbance and the like, the difficulty of deep roadway support, particularly kilometer deep roadway support is obviously increased, the stability of the roadway cannot be kept by a conventional support method, and the support cost is continuously increased due to frequent repair. Practice shows that deep roadway support needs to improve bearing capacity and moderately give pressure, so that stable and economic support effects can be achieved. The load acting on the support body can be reduced by artificially controlling the deformation (i.e. yielding) of the roadway, and the commonly used yielding support comprises a U-shaped steel retractable support and a deformable anchor rod (cable). The retractable support of U-shaped steel belongs to passive support, lets the pressure ability limited, has the unable yieldable problem of card cable auto-lock simultaneously, does not reach the yieldable requirement of deep support. Traditional stock anchor section is shallow, often wholly is in the country rock deformation range, allows tunnel country rock to warp simultaneously and generally is less than 200mm, can not satisfy deep country rock large deformation, also is not fit for doing and lets press supporting construction. The anchor cable has large anchoring depth, is in a small deformation range of surrounding rock, has high supporting bearing capacity and is suitable for being used as a yielding supporting structure. Various constant-resistance deformation anchor cable structures have been developed at present, but have some common disadvantages: one of the two yielding structures is too large in size, so that the drilling difficulty is increased, the diameter of the tail part of the anchor cable is convenient to increase, the traditional lockset tray is not matched, special processing is needed, the adaptability is poor, and the cost is high; the two anchor cables have constant resistance, the high current change is easy to disturb, the load of the surrounding rock is always continuously increased, the deformation of the surrounding rock cannot be effectively controlled by the constant resistance, and the deformation of the surrounding rock needs to be controlled by increasing the resistance; the three deep parts support the surrounding rock load, the whole section of the surrounding rock load is not uniformly distributed, but the surrounding rock load is uneven in size, a resistance-increasing yielding structure is adopted, so that the high supporting force of the large position of the surrounding rock load can be exerted, the small supporting force of the small position of the surrounding rock load can be exerted, the surrounding rock deformation can be uniform, and the use safety of a roadway is ensured. Therefore, a resistance-increasing deformation anchor cable structure is developed, and the tail structure of the anchor cable is universal with the existing anchor cable.
Disclosure of Invention
The invention aims to provide a resistance-increasing deformation anchor cable for deep yielding support and a construction method thereof, and realize synergistic stabilization of surrounding rock in deep support under the condition of deformation control. The resistance-increasing deformation anchor cable can effectively solve the problems of instability, discontinuity and nonlinear large deformation of deep supporting surrounding rock, is favorable for cooperative stabilization of a roadway, relieves the damage of key positions caused by nonuniform load of the surrounding rock, prolongs the service life of a supporting structure, ensures long-term stability of the supporting structure under the action of strong rheology and disturbance load, and is suitable for deep supporting and deep mining supporting. The invention also provides an assembly and working method of the resistance-increasing deformation anchor cable.
In order to achieve the purpose, the resistance-increasing deformation anchor cable for deep yielding support mainly comprises a tensile sleeve, a front-end anchor cable, a tail-end anchor cable, a resistance-increasing hoop, a tray and a lock, wherein:
the tensile sleeve is arranged in the drill hole and is divided into an equal-diameter section at the shallow part of the surrounding rock and a variable-diameter section at the deep part of the surrounding rock, the diameter of the variable-diameter section is gradually reduced along the drilling direction of the drill hole, and an internal thread is processed at the equal-diameter section of the tensile sleeve, which is close to the orifice end; the resistance-increasing hoop is fastened on the outer wall of the diameter-changing section of the tensile sleeve;
the front-end anchor cable and the tail-end anchor cable are arranged in the tensile sleeve at intervals, the front-end anchor cable extends out of the variable-diameter section of the tensile sleeve and then is anchored at the bottom of the hole, and the tail-end anchor cable extends out of the constant-diameter section of the tensile sleeve and then is anchored at the hole opening; the tail part of the front-end anchor cable is sleeved with a wedge-shaped extrusion anchor sliding body, the front end of the tail-end anchor cable is sleeved with an extrusion anchor fixing body with external threads, and the wedge-shaped extrusion anchor sliding body and the sawtooth-shaped extrusion anchor fixing body are required not to be displaced with the respective anchor cable bodies during working;
the tray and the lockset are used for fixing the tail anchor cable at the orifice end.
Further: in order to further fix the tail anchor cable, a limiting block is embedded into the inner hole end of the tensile sleeve.
Further: the resistance-increasing hoops are in multiple stages, and the multiple stages of resistance-increasing hoops are arranged on the outer wall of the tensile sleeve at intervals. Preferably, the thickness of the multistage resistance-increasing cuff increases in the direction from the opening to the bottom of the hole, that is, the thickness of the resistance-increasing cuff increases closer to the bottom of the hole. The resistance-increasing hoop can be a steel ring, and can also be limiting composite reinforced plastic cloth (FRP cloth for short) wound on the tensile sleeve, and the limiting composite reinforced plastic cloth comprises CFRP cloth, GFRP cloth or polypropylene fiber cloth and the like.
It should be noted that the orifice end and the bore bottom end described in the present invention refer to the positions of the respective ends of the cable bolt in the bore hole when the cable bolt is used as a whole.
The assembling method of the resistance-increasing deformation anchor cable for deep yielding support comprises the following steps:
the first step is as follows: after a front-section anchor cable with a wedge-shaped extrusion anchor sliding body is placed from the orifice end of the tensile sleeve, the front-section anchor cable sequentially penetrates through the constant-diameter section of the tensile sleeve and the variable-diameter section of the tensile sleeve and is exposed out of the bottom end of the hole of the tensile sleeve, and the initial position of the wedge-shaped extrusion anchor sliding body is positioned at the foremost end (with the drilling direction as the front) of the constant-diameter section of the tensile sleeve;
the second step is that: one end of the tail anchor cable extrusion anchor fixing body is screwed into the equal-diameter section of the tensile sleeve from the orifice end of the tensile sleeve in a rotating mode, so that the tensile sleeve is firmly connected with the tail anchor cable; then, a limiting block is extruded into the tensile sleeve to further fix the tail anchor cable, so that the tail anchor cable is ensured not to be separated from the tensile sleeve all the time;
a third step; the hoop that hinders increases is twined at tensile sleeve pipe reducing section outer wall, and it can to set up in the drilling with tool to lock and tray during the use, and this time whole anchor rope assembly finishes.
The working method of the resistance-increasing deformation anchor cable for deep yielding support comprises the following steps:
the first step is as follows: drilling a hole at the deep part of the surrounding rock of the roadway to be supported;
the second step is that: feeding an anchoring agent to the bottom of the hole, placing the assembled anchor cable into the drilled hole, so that the exposed end of the front-end anchor cable is anchored in the deep part of the surrounding rock, the front end of the tail-end anchor cable is arranged at the shallow part of the surrounding rock, and the exposed end of the tail-end anchor cable is fastened on the wall of the hole through a tray and a lock;
the third step: when surrounding rock expands and deforms, the extrusion drilling hole deforms along with the deformation, the tensile force of the front-section anchor rope is derived from the friction force generated by the relative sliding of the wedge-shaped extrusion anchor sliding body and the diameter-variable section of the reducing sleeve, the shrinkage stress generated by the deformation of the tensile sleeve and the hoop force of the resistance-increasing hoop, the three forces are finally transmitted to the tensile sleeve, the tensile force is transmitted to the tail anchor rope through the tensile sleeve, when the tensile force of the tail anchor rope exceeds the friction force generated by the relative sliding of the wedge-shaped extrusion anchor sliding body and the diameter-variable section of the tensile sleeve, the shrinkage stress generated by the deformation of the tensile sleeve and the hoop force of the resistance-increasing hoop, the tail anchor rope drives the tensile sleeve to move outwards towards the orifice end along with the hole deformation, when the diameter-variable section of the tensile sleeve slides through the wedge-shaped extrusion anchor sliding body, the yielding is realized, and the yielding amount is controlled by adjusting, generally, the control is 20-40 cm, the four-stage resistance-increasing yielding has three yielding amounts, and the total amount is 60-120 cm.
The invention has the advantages that:
(1) the resistance-increasing deformation anchor cable has good contractibility performance, and can enable deep surrounding rock to moderately give pressure and reduce the surrounding rock load acting on a supporting structure.
(2) The supporting force of the resistance-increasing deformation anchor cable is gradually increased along with the extension deformation of the whole structure so as to resist higher surrounding rock load, when the surrounding rock load gathers to exceed the existing supporting force, the anchor cable can continue to extend and deform, meanwhile, the supporting force is increased again, and the surrounding rock deformation is always in the deformation control range in the process.
(3) Traditional stock can only go deep into rock 1 ~ 2m, and the support of stock will be invalid after the great deformation takes place for the country rock like this, and it will be higher to strut required cost once more, and is also unsafe. The anchor cable is driven into a rock mass for 6-8 m during initial construction, the elongation deformation capacity is 0.6-1.2 m, if surrounding rock deformation exceeds the anchor cable elongation capacity, wall breaking and pressure relief can be performed on the surrounding rock, so that a device for the extendable section of the anchor cable is leaked out, the extendable section of the anchor cable is cut off, and the length of the residual anchor cable in the surrounding rock can be used as a secondary support structure after wall breaking and pressure relief of the surrounding rock.
(4) The resistance-increasing deformation anchor cable for deep pressure relief support provided by the invention has the characteristics of small structure size, good adaptability, low cost and capability of effectively controlling the deformation of the surrounding rock, can effectively solve the problems of instability, discontinuity and nonlinear large deformation of the surrounding rock for deep support, is favorable for cooperative stabilization of a roadway, relieves the damage of key positions caused by uneven load of the surrounding rock, prolongs the service life of the support structure, ensures the long-term stability of the support structure under the action of strong rheology and disturbance load, and has wide practical value and economic value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of an embodiment of the resistance-increasing deformation anchor cable of the invention;
fig. 2 is a schematic diagram of the resistance-increasing deformed anchor cable shown in fig. 1 after primary deformation;
fig. 3 is a schematic view of the tail cable fixing structure of fig. 1.
In the figure:
1-a lock;
2-a tray;
3-a rock wall;
4-tail anchor cable, 4-1-extrusion anchor fixing body and 4-2-tail anchor cable front end;
5-tensile sleeve, 5-1-limiting block, 5-2-diameter-variable section, 5-3-first-level resistance-increasing hoop, 5-3-second-level resistance-increasing hoop, 5-3-third-level resistance-increasing hoop and 5-3-fourth-level resistance-increasing hoop;
6-front section anchor cable, 6-1-front section anchor cable tail part and 6-2-wedge extrusion anchor sliding body;
7-internal thread.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
The front and back in the embodiment are based on the drilling direction of the drilled hole.
As shown in fig. 1, the resistance-increasing deformation anchor cable of the present invention includes a tensile casing 5, a front end anchor cable 6, a tail end anchor cable 4 and a resistance-increasing hoop, wherein:
the tensile sleeve 5 is arranged in a drill hole, the tensile sleeve 5 is divided into an equal-diameter section at the shallow part of surrounding rock and a variable-diameter section 5-2 at the deep part of the surrounding rock, as seen from figure 1, the diameter of the variable-diameter section 5-2 is gradually reduced along the drilling direction of the drill hole, and an internal thread 7 is processed at the equal-diameter section of the tensile sleeve 5 close to the orifice end; four stages of resistance increasing cuffs are arranged on the outer wall of the diameter-variable section 5-2 of the tensile sleeve at intervals, namely, a first stage of resistance increasing cuff 5-3-I, a second stage of resistance increasing cuff 5-3-II, a third stage of resistance increasing cuff 5-3-III and a fourth stage of resistance increasing cuff 5-3-IV, and the thicknesses of the first stage of resistance increasing cuff 5-3-I, the second stage of resistance increasing cuff 5-3-II, the third stage of resistance increasing cuff 5-3-III and the fourth stage of resistance increasing cuff 5-3-IV are sequentially increased, namely, the closer to the bottom of a hole, the larger the thickness of the resistance increasing cuff is.
The front-end anchor cables 6 and the tail-end anchor cables 4 are arranged in the tensile sleeve 5 at intervals, the front-end anchor cables 6 extend out of the variable-diameter section 5-2 of the tensile sleeve and then are anchored at the bottom of a hole, and the tail-end anchor cables 4 extend out of the constant-diameter section of the tensile sleeve and then are anchored on the hole wall 3; a wedge-shaped extrusion anchor sliding body 6-2 is sleeved on the tail part 6-1 of the front end anchor cable, an extrusion anchor fixing body 4-1 with external threads is sleeved on the front end 4-2 of the tail anchor cable, and the external threads of the extrusion anchor fixing body 4-1 are matched with the internal threads 7 of the tensile sleeve 5 (see figure 3).
In order to ensure that the wedge-shaped extrusion anchor sliding body 6-2 and the extrusion anchor fixing body 4-1 and respective anchor cables cannot displace, during manufacturing, the tail part 6-1 of the front end anchor cable or the front end 4-2 of the tail anchor cable are subjected to rust removal treatment and deburred by a polishing machine, then a section of extrusion spring is sleeved on the extrusion spring, the extrusion spring penetrates into an extrusion sleeve and then is placed into an extruder for extrusion, after the extrusion is finished, the extrusion sleeve generates plastic deformation to grip the anchor cables, and external threads are processed on the outer periphery of the extrusion anchor fixing body 4-1, so that the wedge-shaped extrusion anchor sliding body 6-2 or the extrusion anchor fixing body 4-1 is formed.
As can also be seen from fig. 1: a limiting block 5-1 is embedded into the inner hole opening end of the tensile sleeve 5, so that the tail anchor cable 4 is further fixed, and the tail anchor cable 4 is prevented from falling off the tensile sleeve 5.
The following describes the method for assembling the resistance-increasing deformation anchor cable for deep yielding support according to the present invention
The first step is as follows: after a front-section anchor cable 6 with a wedge-shaped extrusion anchor sliding body 6-2 is placed from the orifice end of a tensile sleeve 5, the front-section anchor cable sequentially passes through a tensile sleeve constant-diameter section and a tensile sleeve variable-diameter section 5-2 and is exposed from the bottom end of a tensile sleeve 5 hole, and at the moment, the wedge-shaped extrusion anchor sliding body 6-2 is located at the foremost end of the tensile sleeve 5 constant-diameter section at the initial position;
the second step is that: the tail anchor rope 4 is extruded on one end of the anchor fixing body 4-1 with the external thread 7 and is screwed into the equal-diameter section of the tensile sleeve 5 from the orifice end of the tensile sleeve 5 in a rotating mode, so that the tensile sleeve 5 and the tail anchor rope 4 are firmly connected through threads, and the rotating screwing direction is opposite to the direction of the resin anchoring agent broken through the rotation of the anchor rope; then, a limiting block 5-5 is extruded into the tensile sleeve 5, and the tail anchor cable 4 is further fixed;
a third step; and winding a resistance-increasing hoop on the outer wall of the variable-diameter section 5-2 of the tensile sleeve 5, and finishing the assembly of the whole structure.
The working method of the resistance-increasing deformation anchor cable for deep yielding support comprises the following steps:
the first step is as follows: anchor eye positioning
And (4) carrying out hole site lofting by using a laser survey line, and leading out a pile guard of the hole site before drilling so as to determine the hole center after the drilling machine is in place.
Second step, drilling to form a hole
And selecting a proper drilling method according to the actual engineering condition, paying attention to the cleaning of the anchor hole during drilling, drilling the tail part slightly larger, and meeting the installation requirement of the tensile sleeve, and after the drilling of the anchor hole is finished, checking and accepting.
Thirdly, laying the anchor cable
And (3) checking the through hole of the drilled hole again before the anchor cable enters the hole, cleaning the place where the hole collapses and falls, and avoiding underdepth, carrying out detailed check on the resistance-increasing deformation anchor cable body before installation, checking the number of the anchor cable and the number of the drilled hole, and repairing and replacing the damaged accessory.
The fourth step: an anchoring agent is fed into the bottom of the hole, the cable body which is subjected to rust removal, cleaning and inspection and has no quality problem is manually and slowly pushed into the hole, so that the exposed end of the front-end anchor cable 6 is anchored in the deep part of the surrounding rock, the front end of the tail anchor cable 4 is anchored in the shallow part of the surrounding rock, and the exposed end of the tail anchor cable 4 is fixedly fastened on the hole wall 3 through the tray 2 and the lockset 1; when the anchor cable is pushed, force is required to be applied uniformly, and twisting and bending are prevented. The anchor cable body is put into the hole and keeps consistent with the drilling angle;
the fifth step: when the surrounding rock expands and deforms, the extrusion drilling hole deforms along with the deformation, the tensile force of the front-section anchor cable 6 comes from the friction force generated by the relative sliding of the wedge-shaped extrusion anchor sliding body 6-2 and the variable-diameter section 5-2 of the tensile sleeve, the shrinkage stress generated by the tensile sleeve 5 during deformation and the hoop force of the resistance increasing hoop, the three forces are finally transmitted to the tensile sleeve 5 and transmitted to the tail anchor cable 4 through the tensile sleeve 5, when the tensile force of the tail anchor cable 4 exceeds the friction force generated by the relative sliding of the wedge-shaped extrusion anchor sliding body 6-2 and the variable-diameter section 5-2 of the tensile sleeve, the shrinkage stress generated by the tensile sleeve 5 during deformation and the hoop force of the resistance increasing hoop, the tail anchor cable 4 drives the tensile sleeve 5 to move outwards towards the orifice end along with the hole deformation, and when the variable-diameter section 5-2 of the tensile sleeve slides through the wedge-shaped extrusion anchor sliding body 6-2, the single yielding amount is controlled by adjusting the distance between adjacent resistance increasing cuffs and the size of the zigzag yielding ring, the four-stage resistance increasing yielding is generally controlled to be 20-40 cm, and the total three yielding amounts are 60-120 cm.
The anchor hole positioning, the drilling hole forming and the anchor cable laying of the resistance-increasing deformation anchor cable construction method are characterized in that the tail drilling hole is slightly larger than the tail drilling hole in the construction of a common anchor cable, so that the installation of a tensile sleeve can be met; the front end of the anchor cable is fixed in the surrounding rock by mainly using an anchoring agent instead of grouting. The other construction methods are the same as the common anchor cable.
The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (7)
1. The utility model provides a deep lets presses to strut with increasing and hinders anchor rope that warp which characterized in that, it mainly includes tensile sleeve pipe, front end anchor rope, afterbody anchor rope, increases and hinders cuff, tray and tool to lock, wherein:
the tensile sleeve is arranged in the drill hole and is divided into an equal-diameter section at the shallow part of the surrounding rock and a variable-diameter section at the deep part of the surrounding rock, the diameter of the variable-diameter section is gradually reduced along the drilling direction of the drill hole, and an internal thread is processed at the equal-diameter section of the tensile sleeve, which is close to the orifice end; the resistance-increasing hoop is fastened on the outer wall of the diameter-changing section of the tensile sleeve;
the front-end anchor cable and the tail-end anchor cable are arranged in the tensile sleeve at intervals, the front-end anchor cable extends out of the variable-diameter section of the tensile sleeve and then is anchored at the bottom of the hole, and the tail-end anchor cable extends out of the constant-diameter section of the tensile sleeve and then is anchored at the hole opening; the tail part of the front-end anchor cable is sleeved with a wedge-shaped extrusion anchor sliding body, the front end of the tail-end anchor cable is sleeved with an extrusion anchor fixing body with external threads, and the wedge-shaped extrusion anchor sliding body and the sawtooth-shaped extrusion anchor fixing body are required not to be displaced with the respective anchor cable bodies during working;
the tray and the lockset are used for fixing the tail anchor cable at the orifice end.
2. The resistance-increasing deformation anchor cable for deep yielding support according to claim 1, wherein a limiting block is embedded in the inner orifice end of the tensile sleeve.
3. The resistance-increasing deformation anchor cable for deep yielding support according to claim 1, wherein the resistance-increasing hoops are in multiple stages, and the multiple stages of resistance-increasing hoops are arranged on the outer wall of the tensile sleeve at intervals.
4. A resistance-increasing deformation anchor cable for deep yielding support according to claim 3, wherein the thickness of the multistage resistance-increasing hoop is gradually increased from the hole opening to the hole bottom, that is, the thickness of the resistance-increasing hoop is increased closer to the hole bottom.
5. The resistance-increasing deformation anchor cable for deep yielding support according to claim 1, wherein the resistance-increasing hoop is a steel ring or a limiting composite reinforced plastic cloth, abbreviated as FRP cloth, wound on the tensile sleeve.
6. A method for assembling a resistance-increasing deformation anchor cable for deep yielding support according to any one of claims 1 to 5, which comprises the following steps:
the first step is as follows: after a front-section anchor cable with a wedge-shaped extrusion anchor sliding body is placed from the orifice end of the tensile sleeve, the front-section anchor cable sequentially penetrates through the constant-diameter section of the tensile sleeve and the variable-diameter section of the tensile sleeve to be exposed from the bottom end of the hole of the tensile sleeve, the initial position of the wedge-shaped extrusion anchor sliding body is positioned at the foremost end of the constant-diameter section of the tensile sleeve, and the definition takes the drilling direction as the front;
the second step is that: one end of the tail anchor cable extrusion anchor fixing body is screwed into the equal-diameter section of the tensile sleeve from the orifice end of the tensile sleeve in a rotating mode, so that the tensile sleeve is firmly connected with the tail anchor cable; then, a limiting block is extruded into the tensile sleeve to further fix the tail anchor cable, so that the tail anchor cable is ensured not to be separated from the tensile sleeve all the time;
a third step; the hoop that hinders increases is twined at tensile sleeve pipe reducing section outer wall, and it can to set up in the drilling with tool to lock and tray during the use, and this time whole anchor rope assembly finishes.
7. A method of operating a resistance-increasing deformation anchor cable for deep yielding support according to any one of claims 1 to 5,
the first step is as follows: drilling a hole at the deep part of the surrounding rock of the roadway to be supported;
the second step is that: feeding an anchoring agent to the bottom of the hole, placing the assembled anchor cable into the drilled hole, so that the exposed end of the front-end anchor cable is anchored in the deep part of the surrounding rock, the front end of the tail-end anchor cable is arranged at the shallow part of the surrounding rock, and the exposed end of the tail-end anchor cable is fastened on the wall of the hole through a tray and a lock;
the third step: when the surrounding rock is expanded and deformed, the extrusion drilling hole is deformed, the tensile force of the front-section anchor cable is derived from the friction force generated by the relative sliding of the wedge-shaped extrusion anchor sliding body and the diameter-variable section of the reducing sleeve, the contraction stress generated by the deformation of the tensile sleeve and the hoop force of the resistance-increasing hoop, the three forces are finally transmitted to the tensile sleeve, the tensile force is transmitted to the tail anchor cable through the tensile sleeve, when the tensile force of the tail anchor cable exceeds the friction force generated by the relative sliding of the wedge-shaped extrusion anchor sliding body and the diameter-variable section of the tensile sleeve, the contraction stress generated by the deformation of the tensile sleeve and the hoop force of the resistance-increasing hoop, the tail anchor cable drives the tensile sleeve to move outwards towards the orifice end along with the hole-drilling deformation, and when the diameter-variable section of the tensile sleeve slides.
Priority Applications (1)
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| CN112879058A (en) * | 2021-01-21 | 2021-06-01 | 北京科技大学 | Radial internal expansion resistance-increasing anchor rod cable supporting device and method |
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