CN217783548U - Anchor high-pretightening-force anchor cable supporting device - Google Patents
Anchor high-pretightening-force anchor cable supporting device Download PDFInfo
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- CN217783548U CN217783548U CN202221613217.6U CN202221613217U CN217783548U CN 217783548 U CN217783548 U CN 217783548U CN 202221613217 U CN202221613217 U CN 202221613217U CN 217783548 U CN217783548 U CN 217783548U
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Abstract
The utility model provides an anchor high pretightening force anchor cable supporting device, which comprises an anchor cable rod body, a lock clamping piece and an anchor cable stretching device; the middle of the anchor cable stretching device is a circular cavity, a lock tongue is arranged in the cavity, the tail part of the anchor cable rod body extends into the cavity of the anchor cable stretching device, a lock and a locking clamping sheet are sequentially sleeved on the anchor cable rod body, and the locking clamping sheet is positioned between the lock and the anchor cable stretching device; driving the anchor cable stretching device to push the lockset and the locking clamping piece to be stretched and locked; in the anchor cable supporting device, the pressure can be increased by more than 2.5 times by installing the anchor cable stretching device on a power hydraulic system (the liquid supply pressure of a heading machine is 20-22 MPa), so that the initial pre-tightening force of the anchor cable is increased by more than 2.5 times, the pre-stress of the anchor cable rod body is enhanced, the effect of actively supporting a top plate and a side wall of the anchor cable is better achieved, the safety coefficient of anchor cable supporting is increased, and the initiative and the effectiveness of anchor cable supporting are improved.
Description
Technical Field
The utility model relates to a colliery is high stress area's in the pit technical field that struts, especially relates to a high pretightning force anchor rope supporting device of anchor.
Background
With the increase of high-strength mining and mining depth of underground coal mines, the control difficulty of surrounding rocks of the roadway is gradually increased, so that the roadway support is difficult, and the damage and repair rate of the roadway are aggravated.
The anchor cable support has the advantages of high construction speed, good support effect, low labor intensity, low cost and the like, is commonly used by coal mine tunnels, is successfully developed in 1996 and is suitable for small-aperture resin anchoring prestressed anchor cables under coal mine conditions, further solves the problem of the original complex tunnel support of coal mines, and becomes a key technology for tunnel support and surrounding rock reinforcement. The anchor agent at the end part of the anchor cable is used for bonding wall rocks on the wall of the anchor cable to provide anchoring force for the anchor cable, and the wall rocks form a bearing structure by applying pretightening force to the anchor cable support system, so that the stress state of the wall rocks after tunneling and excavation is improved.
The method is characterized in that new technical Specifications for supporting anchor rods of coal mine roadways (GB/T35056-2018) require that initial pre-tightening force of anchor cables (more phi 21.8mm-1 x 19 strands of high-strength and low-relaxation prestressed steel strands are used on site, and about 607kN of ultimate breaking load) is required to be not less than 40% of the lowest value of the yield load of the anchor cables, and traditional pneumatic anchor cable tensioning machines (MQ 22-300/60) are adopted for tensioning and pre-tightening of the anchor cables on site. In addition, theoretical loss and construction loss also exist in the initial pre-tightening force of the anchor cable, the actual pre-tightening force loss after the anchor cable is stretched reaches 30-50%, the initial pre-tightening force of the anchor cable is actually measured on site and is basically about 80-100kN, and the initial pre-tightening force value of the anchor cable is also multiple times smaller than the required requirements of the broken load of the anchor cable rod body and the effective load of the anchor cable support system, so that the anchor cable support system cannot effectively play a role in bearing and controlling the surrounding rock of the roadway. In addition, after the tunnel is excavated, the anchor cable is easy to slip due to the influence of horizontal stress and stress concentration, and the anchor cable is easy to break and damage to lose efficacy, so that the tunnel is deformed and difficult to support, the repair work is high-risk, and the safety production is influenced.
The initial pre-tightening force of the anchor cable in the field construction is low, the anchor cable support cannot effectively play the role of bearing and controlling the surrounding rock of the roadway, the effect of the anchor cable support in the field is poor, when high pre-stress is applied, the displacement difference of an anchoring area is small, the stress change of the anchor cable is small, and the support effect is good. As shown in fig. 1, the graph is a graph of actual measurement of stress of an anchor cable, in the graph, the prestress of the anchor cable is low in a curve (1), the anchor cable is in passive support, the stress of the anchor cable is small, the support of the anchor cable is not obvious, when certain prestress is applied, the curves (2), (3) and (4) are that the prestress is smaller than a critical value, the anchor cable cannot effectively control early separation of surrounding rock, and in the curve (5), high prestress is applied, the displacement difference of an anchoring area is small, and the stress change of the anchor cable is not large; as can be seen from the figure 1, the anchor cable forms a prestressed structure through high pretightening force, the stress change of the anchor cable is small, the supporting effect is good, and the anchor cable support can effectively play the role of bearing and controlling the surrounding rock of the roadway.
The anchor cable support is a method and measures for controlling displacement and damage of surrounding rocks corresponding to stability of the surrounding rocks of the roadway, the anchor cable takes root in a stable rock stratum, initial high pre-tightening force is applied to actively reinforce the surrounding rocks of the roadway, and bearing and control are realized; the displacement and deformation of the supported surrounding rock of the roadway are small, the supporting is effective within the control allowable range, otherwise, the supporting is not timely performed, the anchor cable cannot root to stabilize the rock stratum or the initial high pretightening force is not applied to the anchor cable, the reinforcing, bearing and control effects cannot be timely realized, the surrounding rock of the roadway is influenced by the stress, the deformation is large, the supporting is invalid, and the roadway is collapsed. As shown in fig. 2, the graph is an anchor cable support response curve, in the graph, the anchor cable support effect is not obvious in curve (1) and is not different from that of no support, the anchor cable support effect tends to be stable after the wall rock is greatly displaced, the displacement of the wall rock before the anchor cable is broken is smaller in curve (2), the displacement of the wall rock after the anchor cable is broken is increased sharply, the displacement of the wall rock in curve (4) is larger and cannot be stable, and the displacement of the wall rock is effectively controlled by applying high prestress strong support in curve (5). As can be seen from the figure 2, the anchor cable support is active, the reinforcing, bearing and controlling effects are effective, the anchor cable support response effect is good, the surrounding rock displacement is small, and the roadway tends to a stable state.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that how to improve the initial pretightning force of the anchor rope body of rod, factor of safety is strutted to the increase anchor rope.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
an anchor high-pretightening-force anchor cable supporting device comprises an anchor cable rod body, a lockset, a lock clamping piece and an anchor cable tensioning device; the middle of the anchor cable stretching device is a circular cavity, a lock tongue is arranged in the cavity, the tail part of the anchor cable rod body extends into the cavity of the anchor cable stretching device, the lock and the lock clamping piece are sequentially sleeved on the anchor cable rod body, and the lock clamping piece is positioned between the lock and the anchor cable stretching device; and driving the anchor cable stretching device to push the lock and the locking clamping piece to be stretched and locked.
In the anchor cable supporting device, the pressure can be increased by more than 2.5 times by installing the anchor cable stretching device on a power hydraulic system (the liquid supply pressure of a heading machine is 20-22 MPa), so that the initial pre-tightening force of the anchor cable is increased by more than 2.5 times, the pre-stress of the anchor cable rod body is enhanced, the effect of actively supporting a top plate and a side wall of the anchor cable is better achieved, the safety coefficient of anchor cable supporting is increased, and the initiative and the effectiveness of anchor cable supporting are improved.
Further, the lock further comprises a tray, a middle hole of the tray is 2-4mm larger than the diameter of the anchor cable rod body, the tray is sleeved on the anchor cable rod body, and the tray is located between the surrounding rock wall and the lock.
Furthermore, the cable bolt further comprises a core adjusting ball pad, wherein the core adjusting ball pad is sleeved on the anchor cable rod body, and the core adjusting ball pad is located between the tray and the lockset.
Further, still include power hydraulic system, power hydraulic system is connected with anchor rope tensioning ware.
Furthermore, the power hydraulic system comprises a mechanical pressure gauge, a pressure cylinder, a high-pressure oil pipe, a filter, an overflow valve and a hydraulic valve bank; the mechanical pressure gauge is arranged on the high-pressure oil pipe, and the pressure cylinder, the filter, the overflow valve and the hydraulic valve group are sequentially arranged on the high-pressure oil pipe.
Further, the filter comprises a first filter and a second filter, the first filter is connected to a high-pressure oil pipe between the input port of the pressure cylinder and the overflow valve, and the second filter is connected between the liquid return output port of the pressure cylinder and the hydraulic valve group.
Furthermore, the anchor cable rod body is a phi 21.8mm-1 multiplied by 19 high-strength low-relaxation prestressed steel strand, the tensile strength grade is larger than or equal to 1860Mpa, the ultimate breaking tension is 607KN, and the elongation is larger than or equal to 7%.
Further, the specification of the tray is 150mm multiplied by 16mm, and the tensile strength is more than 490Mpa.
Furthermore, the core adjusting ball pad is conical, and the top and the bottom of the core adjusting ball pad form a 10-degree included angle.
Furthermore, the lock specification is KM22-1860, the lock efficiency coefficient is greater than or equal to 0.95, and the total elongation is greater than or equal to 2.0%; the static load anchoring performance coefficient of the locking clip is more than or equal to 0.95.
The utility model has the advantages that:
1. in the anchor cable supporting device, the pressure can be increased by more than 2.5 times by installing the anchor cable stretching device on a power hydraulic system (the liquid supply pressure of a heading machine is 20-22 MPa), so that the initial pre-tightening force of the anchor cable is increased by more than 2.5 times, the pre-stress of the anchor cable rod body is enhanced, the effect of actively supporting a top plate and a side wall of the anchor cable is better achieved, the safety coefficient of anchor cable supporting is increased, and the initiative and the effectiveness of anchor cable supporting are improved.
2. The anchor cable supporting device utilizes a power hydraulic system to replace an original pneumatic and inefficient anchor cable tensioning instrument, the existing tunneling head-on adopts the power hydraulic tensioning anchor cable pressurizing device to tension an anchor cable for only 5-10 seconds, the length is advanced for 3 meters per small shift, the required time is less than 10min, 110min is saved, the efficiency is improved by 11 times, the labor intensity of workers is reduced, the tunneling efficiency and the work efficiency are improved, the problems that the initial tensioning force of a mining pneumatic anchor cable tensioning instrument is small, the requirement of the initial tensioning force cannot be met by anchor cable supporting are well solved, the initial tensioning force of the anchor cable is improved by more than 2.5 times, the initial tensioning force of a roof anchor cable is actually measured on site and reaches more than 220-240kN, and the initiative and the effectiveness of the anchor cable supporting are improved.
3. The high pre-tightening force applied by the anchor cable support is effectively diffused through surface protection components such as an anchor cable beam (T-shaped steel belt) and a tray, so that the overall rigidity of the anchoring body is improved, and the integrity, the support integrity and the effectiveness of a top plate are kept; the anchor cable rod body has the advantages of controlling the deformation and the separation of the surrounding rock, fully improving and playing the bearing capacity of the surrounding rock, avoiding the maintenance of the roadway and adapting to the support of a deep high stress area.
4. The anchor cable supporting device is simple in construction process, can be used for supporting a top plate and a side wall, is compact in structure and light in weight, and is simpler and more convenient to operate than a mining pneumatic anchor cable tensioning machine.
Drawings
FIG. 1 is a graph of actual measurement of the force applied to an underground anchor cable;
FIG. 2 is a graph of downhole anchor bolt support response;
FIG. 3 is a schematic view of the fixing position of the anchor cable rod body and the coal wall according to the present invention;
fig. 4 is a schematic structural view of a power hydraulic system in the anchor cable support device of the present invention;
fig. 5 is a schematic view of the anchor cable support device of the present invention;
fig. 6 is a high-pressure oil flow diagram of the low-pressure flushing stage of the power hydraulic system in the anchor cable support device of the present invention;
fig. 7 is a high-pressure oil flow diagram of the power hydraulic system in the anchor cable support device in the pressurization stage of the present invention;
in the figure: the hydraulic anchor cable comprises an anchor cable rod body 1, a tray 2, a core-adjusting ball pad 3, a lock 4, a lock 5, a clamp sheet 6, an anchor cable tensioning device 7, a power hydraulic system 7, a mechanical pressure gauge 71, a pressure cylinder 72, a high-pressure oil pipe 73, a filter 74, a first filter 741, a second filter 742, a reverse flow valve 75, a hydraulic valve bank 76, a hydraulic control one-way valve 761, a liquid inlet one-way valve 762, a liquid outlet one-way valve 763, a pressure boosting reversing valve 764, a pressure boosting reversing valve T port 7641, an electromagnetic reversing valve 765, a coal wall surrounding a rock wall or an upper part coal wall 8, a resin cartridge solidified at a medium speed 9, a liquid inlet oil pipe A, a liquid return oil pipe B, a high-pressure oil inlet P and a high-pressure oil return outlet T.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined with the following description to clearly and completely describe the technical solution in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further described below with reference to the drawings and specific embodiments of the specification:
as shown in fig. 3-5, the anchor cable supporting device comprises an anchor cable rod body 1, a tray 2, a core-adjusting ball pad 3, a lock 4, a lock clip 5, an anchor cable stretching device 6 and a power hydraulic system 7, wherein a common anchor drilling machine is adopted to construct an anchor cable hole on a surrounding rock wall or a side coal wall 8, the hole diameter is larger than the diameter of the anchor cable rod body 1 by 6-10 mm, a medium-speed solidified resin cartridge 9 is sequentially filled into the anchor cable hole, the top of the anchor cable rod body 1 extends into the anchor cable hole, the tray 2, the core-adjusting ball pad 3, the lock 4 and the lock clip 5 are sequentially sleeved at the tail end of the anchor cable rod body 1, a circular cavity is formed in the middle of the anchor cable stretching device 6, the anchor cable rod body 1 extends into the circular cavity by no less than 80mm, a lock tongue is arranged in the cavity, the lock tongue 1 is locked when the anchor cable is stretched, the anchor cable stretching device 6 stretches out to push the lock 4 and the lock clip 5 to move forwards, the lock clip 5 is wedged into the lock 4 after the lock 5 is stretched to a set value, and the anchor cable rod body 1 is locked and fixed; the core-adjusting ball pad 3 adjusts the anchor cable rod body 1 to be in a vertical stress direction and an optimal stress state; the anchor cable stretching device 6 is connected with the power hydraulic system 7 through the high-pressure oil pipe 73, when the power hydraulic system 7 works, the anchor cable stretching device 6 is stretched and locked, and the locking clamping piece 5, the lock 4, the core adjusting ball pad 3 and the tray 2 are pushed to stretch with high pretightening force.
The power hydraulic system 7 includes: a mechanical pressure gauge 71, a pressure cylinder 72, a high-pressure oil pipe 73, a filter 74, an overflow valve 75 and a hydraulic valve group 76. The mechanical pressure gauge 71 is connected to a pipeline tee joint through a high-pressure oil pipe 73, the pressure cylinder 72, the filter 74 and the hydraulic valve group 76 are connected through the high-pressure oil pipe 73, and the joints are fixed through nuts.
The pressure cylinder 72 is an automatic pressure boosting cylinder, the area of the low-pressure piston LP is larger than that of the high-pressure piston HP, the low-pressure pushes the low-pressure piston LP to move upwards and compress a liquid column at the end of the high-pressure piston HP to generate high pressure, and the ratio of the high-pressure to the low-pressure is equal to the area ratio of the low-pressure piston LP to the high-pressure piston HP, namely the pressure boosting ratio.
The strainer 74 includes a first strainer 741 and a second strainer 742, the first strainer 741 is connected to the high-pressure line 73 between the inlet P of the pressure cylinder 72 and the relief valve 75, and the second strainer 742 is connected between the return fluid outlet T of the pressure cylinder 72 and the union nut of the three-way pipe.
The hydraulic valve group 76 includes: a hydraulic control one-way valve 761, a liquid inlet one-way valve 762, a liquid outlet one-way valve 763, a boosting reversing valve 764, a boosting reversing valve T port 7641 and an electromagnetic reversing valve 765; the hydraulic control one-way valve 761, the liquid inlet one-way valve 762, the liquid outlet one-way valve 763, the boosting reversing valve 764 and the electromagnetic reversing valve 765 are all installed on the pipeline of the high-pressure oil pipe 73, and the boosting valve T port 7641 is located in the boosting reversing valve 764.
The anchor cable rod body 1 is made of phi 21.8mm-1 multiplied by 19 strands of high-strength low-relaxation prestressed steel strands, the tensile strength grade is not lower than 1860Mpa, the ultimate breaking tension is 607KN, and the elongation is not lower than 7%; the specification of the tray 2 is 150mm multiplied by 16mm, the tray is formed by stamping steel plates, the tensile strength is greater than 490MPa, and the strength is matched with the strength of the anchor cable rod body; the core-adjusting ball pad 3 is made of cast iron and is in a conical shape, an included angle of 10 degrees is designed between the top and the bottom, and the core-adjusting ball pad 3 is installed to adjust the anchor cable rod body 1 to be in a vertical stress direction and an optimal stress state, so that the anchor cable rod body 1 is in a tensile stress state.
The specification of the lockset 4 is KM22-1860, the efficiency coefficient is not less than 0.95, and the total elongation is not less than 2.0%; the static load anchoring performance coefficient of the locking clip 5 is not less than 0.95; the locking clamping piece 5 and the lock 4 are installed and pushed by the power hydraulic system 7 and the anchor cable stretching device 6, the initial pre-tightening force of the anchor cable rod body 1 reaches a set value of more than 180kN, and the anchor cable supporting device is guaranteed to have higher pre-tightening force.
The working principle is as follows:
constructing anchor cable holes on a surrounding rock wall or a side coal wall 8, sequentially filling medium-speed solidified resin cartridges 9 into the anchor cable holes, enabling the top of an anchor cable rod body 1 to penetrate into the anchor rod holes, driving the anchor cable rod body 1 to stir the medium-speed solidified resin cartridges 9 through rotation of stirring equipment, enabling 18-20Mpa high-pressure oil input through a tunneling machine oil pump hydraulic system to enter a pressurizing cylinder 72 from a high-pressure oil input port P after the end of the anchor cable rod body 1 is lengthened and anchored through the medium-speed solidified resin cartridges 9, boosting the pressure by 40-45Mpa, tensioning and locking through an anchor cable tensioning device 6, enabling the anchor cable tensioning device 6 to push a locking clamping piece 5, a lock 4, a core adjusting ball pad 3 and a tray 2 to perform high-pretightening force tensioning, and enabling the high-pressure oil to return to the hydraulic valve group 76 from a high-pressure oil return output port T through a high-pressure oil pipe 73 when the anchor cable tensioning device 6 contracts, so that repeated tensioning is formed. The anchor rope body of rod 1 is through the tip extension anchor, and the tray 2 of afterbody, tool to lock 4, lock clamping piece 5 stretch-draw pretension produce high pretightning force to strutting the country rock, and the adjusting core ball pad 3 adjustment anchor rope body of rod 1 is in perpendicular atress direction and best stress state, and the anchor rope support device installation pretension is accomplished the back, produces high pretightning force to coal wall 8, forms high pretightning force bearing structure.
As shown in fig. 6, the low-pressure charging stage of the power hydraulic system: high-pressure oil enters the boosting reversing valve 764 from the port P, and most of the high-pressure oil directly enters the rodless cavity of the oil cylinder of the boosting cylinder 72 through the hydraulic control one-way valve 761 and the liquid outlet one-way valve 763; the rest of the oil reaches the rodless cavity of the oil cylinder through the liquid inlet one-way valve 762, and quick oil supply is realized.
As shown in fig. 7, the boost phase of the power hydraulic system: the hydraulic control one-way valve 761 is automatically closed due to pressure balance, and the high-pressure oil reaches the top end of the piston HP of the pressure cylinder 72 through the liquid inlet one-way valve 762, so as to push the piston LP of the pressure cylinder 72 to move downwards to the bottom together, and at this time, the pressure boosting reversing valve T port 7641 is in a closed state. When the piston HP bottoms, the high pressure oil will communicate with the upper part of the spool of the pressure-increasing valve 764, pushing the spool downward. After reversing, the high-pressure oil reaches the bottom of the piston LP through the pressure-increasing valve 764, and at this time, the pressure-increasing reversing valve T port 7641 is in an open state, pushing the piston HP to move upwards, outputting the high-pressure oil, and directly reaching the rodless cavity of the oil cylinder of the pressure cylinder 72; after the piston HP reaches the top, the top of the pressure boosting reversing valve 764 is connected with the pressure boosting reversing valve T port 7641, the pressure boosting reversing valve 764 reverses again and returns to the initial position in the figure when high-pressure oil enters from the high-pressure oil inlet P port, at this time, the pressure boosting reversing valve T port 7641 is in an open state, and thus automatic circulation is achieved, the pressure boosting reversing valve 764 can realize high-frequency action and continuously output the high-pressure oil.
Automatic pressure maintaining of a power hydraulic system: after the high-pressure end pressure makes the high-pressure piston HP and the low-pressure piston LP reach mechanical balance, the pistons stop acting, and when the pressure on the high-pressure side is reduced due to the reduction of load or leakage and other factors, the high-pressure piston and the low-pressure piston lose mechanical balance and automatically and circularly supplement pressure.
The power hydraulic system has the unloading function that the electromagnetic reversing valve 765 reverses, the hydraulic control one-way valve 761 is opened when high-pressure oil returns to the oil inlet of the oil outlet T, the high-pressure oil in the rodless cavity of the oil cylinder flows back to the high-pressure oil inlet P through the hydraulic control one-way valve 761 and returns to a system oil tank through the electromagnetic reversing valve 765.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. The anchor high-pretightening-force anchor cable supporting device is characterized by comprising an anchor cable rod body, a lockset, a lock clamping piece, an anchor cable tensioning device and a power hydraulic system; the middle of the anchor cable stretching device is a circular cavity, a lock tongue is arranged in the cavity, the tail part of the anchor cable rod body extends into the cavity of the anchor cable stretching device, the lock and the lock clamping piece are sequentially sleeved on the anchor cable rod body, and the lock clamping piece is positioned between the lock and the anchor cable stretching device; the anchor cable stretching device is driven to push the lock and the locking clamping piece to be stretched and locked, the power hydraulic system is connected with the anchor cable stretching device, and the power hydraulic system comprises a mechanical pressure gauge, a pressure cylinder, a high-pressure oil pipe, a filter, an overflow valve and a hydraulic valve group; the mechanical pressure gauge is arranged on the high-pressure oil pipe, and the pressure cylinder, the filter, the overflow valve and the hydraulic valve group are sequentially arranged on the high-pressure oil pipe.
2. The anchor high-pretightening force anchor cable support device as claimed in claim 1, further comprising a tray, wherein a middle hole of the tray is 2-4mm larger than the diameter of the anchor cable rod body, the tray is sleeved on the anchor cable rod body, and the tray is positioned between the surrounding rock wall and the lock.
3. The anchor high-pretightening force anchor cable support device as claimed in claim 2, further comprising a core-adjusting ball pad, wherein the core-adjusting ball pad is disposed on the anchor cable rod body, and the core-adjusting ball pad is located between the tray and the lock.
4. The anchor high-pretension anchor cable support device according to claim 1, wherein the filter comprises a first filter and a second filter, the first filter is connected to the high-pressure oil pipe between the charging cylinder input port and the relief valve, and the second filter is connected between the charging cylinder return fluid output port and the hydraulic valve bank.
5. The anchor high-pretightening force anchor rope support device as claimed in claim 1, wherein the anchor rope rod body is a phi 21.8mm-1 x 19 high-strength low-relaxation prestressed steel strand, the tensile strength grade is 1860Mpa or more, the ultimate breaking tension is 607KN, and the elongation is 7% or more.
6. The anchor high pre-tightening force anchor cable support device as claimed in claim 2, wherein the tray is 150mm x 16mm in specification, and the tensile strength is greater than 490Mpa.
7. The anchor high-pretightening force anchor cable support device as claimed in claim 3, wherein the core-adjusting ball pad is conical, and the top and bottom of the core-adjusting ball pad form an included angle of 10 degrees.
8. The anchor high-pretightening-force anchor cable support device as claimed in claim 1, wherein the lock specification is KM22-1860, the lock efficiency coefficient is greater than or equal to 0.95, and the total elongation is greater than or equal to 2.0%; the static load anchoring performance coefficient of the lock clamping piece is more than or equal to 0.95.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221613217.6U CN217783548U (en) | 2022-06-22 | 2022-06-22 | Anchor high-pretightening-force anchor cable supporting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221613217.6U CN217783548U (en) | 2022-06-22 | 2022-06-22 | Anchor high-pretightening-force anchor cable supporting device |
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| CN217783548U true CN217783548U (en) | 2022-11-11 |
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| CN202221613217.6U Active CN217783548U (en) | 2022-06-22 | 2022-06-22 | Anchor high-pretightening-force anchor cable supporting device |
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