CN116556336B - Hot-melt recyclable U-shaped anchor cable and construction method thereof - Google Patents
Hot-melt recyclable U-shaped anchor cable and construction method thereof Download PDFInfo
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- CN116556336B CN116556336B CN202310701449.XA CN202310701449A CN116556336B CN 116556336 B CN116556336 B CN 116556336B CN 202310701449 A CN202310701449 A CN 202310701449A CN 116556336 B CN116556336 B CN 116556336B
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- spring
- transmission rod
- rope
- firing pin
- anchor head
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- 239000012943 hotmelt Substances 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 title claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 66
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000010304 firing Methods 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 26
- 238000001125 extrusion Methods 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 17
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 8
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 6
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 claims description 4
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 claims description 4
- 238000005381 potential energy Methods 0.000 claims description 4
- 239000000314 lubricant Substances 0.000 claims description 3
- 235000011837 pasties Nutrition 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000009347 mechanical transmission Effects 0.000 abstract description 2
- 238000004873 anchoring Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920003192 poly(bis maleimide) Polymers 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention discloses a hot-melt recoverable U-shaped anchor cable, which comprises a transmission rope, a steel strand, an extrusion heater, an anchor head, an igniter and a metal clamping piece; the driving rope stretches into the anchor head and is connected with the igniter; the inside of the anchor head is provided with a cavity for accommodating the extrusion heater and the igniter, and the outer surface of the anchor head is provided with a groove for embedding the steel stranded wires and the metal clamping pieces; the steel stranded wires are embedded into the grooves from two sides and are connected with the bushing; the bushing is connected with the metal clamping piece; the igniter comprises a spring limiter, a spring, a firing pin, a transmission rod and a transmission rod limiter, wherein one end of the spring is connected with the spring limiter, the other end of the spring is connected with the firing pin, the transmission rod is connected with a transmission rope, and the transmission rod, the transmission rod limiter and the transmission rope are used for fixing or releasing the firing pin; the striker is able to ignite the pinch heater by striking. The invention also discloses a construction method of the hot-melt recoverable U-shaped anchor cable. The invention activates the heating system in a mechanical transmission mode, saves energy, and is environment-friendly.
Description
Technical Field
The invention belongs to an anchor cable and a construction method thereof, and particularly relates to a hot-melt recyclable U-shaped anchor cable and a construction method thereof.
Background
In foundation pit supporting engineering, a prestressed anchor cable device is one of the most commonly used temporary supporting devices, and steel strands in an anchor cable cannot be recovered, which causes problems, for example: a great deal of waste of steel strand materials; the steel strand left underground pollutes the environment, and the anchor cable invades the construction of building red line influence next building planning land, can also cause harmful effect etc. to surrounding building.
In view of the above problems, many recoverable anchor rods have been developed, such as mechanical directly-extracted recoverable U-shaped anchor cables, hot-melt type recoverable anchor cables, etc., but the recoverable anchor cables have certain disadvantages: 1. the radius of the rotary bearing head at the front end of the U-shaped recyclable anchor cable is smaller, so that the U-shaped recyclable anchor cable is not easy to draw out in the drawing process; 2. the existing hot-melt recoverable anchor cable adopts an electric heating resistance wire method to melt hot-melt materials or directly melt the anchor cable, so that the heating time is too long, a large amount of electric energy is consumed, and the policy guidelines of the state in the aspects of energy conservation, emission reduction and environmental protection are not met; 3. the existing hot-melt recoverable anchor cable is heated by adopting an electric heating resistance wire mode, and the electric wires in the anchor hole or the external environment are easy to erode, so that too much uncertainty exists in recovery, and the recovery rate is reduced.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention aims to provide the hot-melt type recoverable U-shaped anchor cable which is convenient to recover and high in anchoring force, and the other aim of the invention is to provide a construction method of the hot-melt type recoverable U-shaped anchor cable, which is environment-friendly, stable and reliable.
The technical scheme is as follows: the invention relates to a hot-melt recoverable U-shaped anchor cable, which comprises a transmission rope, a steel strand, an extrusion heater, an anchor head, an igniter and a metal clamping piece; the driving rope stretches into the anchor head and is connected with the igniter; the inside of the anchor head is provided with a cavity for accommodating the extrusion heater and the igniter, and the outer surface of the anchor head is provided with a groove for embedding the steel stranded wires and the metal clamping pieces; the steel stranded wires are embedded into the grooves from two sides and are connected with the bushing; the bushing is connected with the metal clamping piece; the igniter comprises a spring limiter, a spring, a firing pin, a transmission rod and a transmission rod limiter, wherein one end of the spring is connected with the spring limiter, the other end of the spring is connected with the firing pin, the transmission rod is connected with a transmission rope, and the transmission rod, the transmission rod limiter and the transmission rope are used for fixing or releasing the firing pin; the striker is able to ignite the pinch heater by striking.
Further, the extrusion heater comprises a constraint shell, a primer, a fire-guiding hole, a fire-guiding strip, a combustion improver, a heat-conducting agent and a bottom cover, wherein the primer, the fire-guiding hole, the combustion improver, the heat-conducting agent and the bottom cover are sequentially arranged in the constraint shell along the direction far away from a firing pin, one end of the fire-guiding strip penetrates through the fire-guiding hole, the other end of the fire-guiding strip is embedded into the heat-conducting agent, and the vertical placement enables chemical reaction to be easier to carry out.
Further, the bottom cover is made of hot melt type material, and is FEP resin, bismaleimide or organic silicon resin, so that heat loss of the heat conducting agent in the heat transfer process is reduced. The igniting strip is magnesium strip, the combustion improver is potassium chlorate, the ignition point of the magnesium strip is low, the heat release amount is high during combustion, the ignition is easy, the heat conducting agent is easy to ignite, and the potassium chlorate is heated and decomposed to generate oxygen.
Further, the heat conducting agent comprises aluminum powder, ferric oxide powder and ferrosilicon powder, the mass ratio of the aluminum powder to the ferric oxide powder to the ferrosilicon powder is 1:3:1, the reaction is easier to carry out, and the reaction time can be prolonged by adding a proper amount of ferrosilicon powder, so that the reaction is more sufficient. The grain diameter of the aluminum powder is 1-2 microns, the grain diameter of the ferric oxide powder is less than 1 micron, and the grain diameter of the ferrosilicon is 1-2 microns, so that the reaction is more sufficient.
Further, one end of the driving rope and one end of the steel strand, which are far away from the anchor head, sequentially pass through the anchor pier, the pad seat and the outer anchor.
Further, the transmission ropes and the steel twisted wires are sleeved with PVC sleeves. The transmission rope is made of ultra-high molecular weight polyethylene fiber, and the ultra-high molecular weight polyethylene fiber material has strong impact resistance, cutting resistance, chemical corrosion resistance and wear resistance and long deflection life.
Further, the surface of the driving rope is smooth, the outer surface of the driving rope is coated with pasty lubricant, and the driving rope is welded on the driving rod, so that the driving rope is easier to withdraw outwards and drive.
The construction method of the hot-melt recoverable U-shaped anchor cable comprises the following steps of:
step one, enabling a spring to be in a compressed state, limiting the rotation of a transmission rod through a transmission rod limiter, enabling one end of the transmission rod to prop against a firing pin to prevent the spring from extending, enabling the spring, the firing pin, the transmission rod and the transmission rod limiter to be in a stress balance state, and then fixing a transmission rope on the transmission rod limiter, wherein the length of the transmission rope is larger than that of a hot-melt type recoverable U-shaped anchor cable;
installing an extrusion heater at a position right below the firing pin, wherein the distance between the extrusion heater and the firing pin is smaller than the complete extension distance of the spring, and the distance between the bottom cover and the bottom of the anchor head is smaller than 3cm;
step three, nesting PVC sleeve pipes on the steel stranded wires and the driving ropes, wherein the steel stranded wires nested with the PVC sleeve pipes are arranged along the grooves on the anchor heads, and are fixedly connected through metal clamping pieces embedded with bushings at the middle positions of the bottoms of the anchor heads;
installing the anchor head into the drill hole, extending the driving rope to the outside of the hole, and grouting into the drill hole;
step five, stretching the steel strand after the grouting material reaches 75% of the design strength and is more than 15MPa, so that the steel strand is locked after the grouting material reaches the design tensile force;
step six, in the anchor cable recovery stage, the driving rope is pulled outwards, the driving rope drives the driving rod to rotate anticlockwise and then separate from the firing pin, at the moment, the spring is not limited, and stretches to release elastic potential energy to enable the firing pin to strike the extrusion type igniter, high temperature is generated by combustion to enable the bushing to be melted, and the constraint of the steel stranded wire is released;
and step seven, the separated steel strands are pulled out of the PVC sleeve and are arranged for the next use.
Working principle: and (3) an anchoring stage: the anchor head not only can accommodate the recovery anchor rope devices such as the extrusion heater, the igniter and the like, but also can fix the anchor rope, increase the contact area with grouting materials and achieve the effect of increasing the anchoring force; the metal clamping piece at the bottom of the anchor head is used for fixing the steel stranded wires and increasing the contact area between the anchor head and the anchoring body, so that the anchoring force of the invention is higher.
In the recovery stage: the driving rope is pulled outwards, the driving rope drives the driving rod to rotate anticlockwise by a certain angle and then is separated from the firing pin, at the moment, the spring is not limited to extend to release elastic potential energy, so that the firing pin can strike the constraint shell of the extrusion type igniter to ignite the primer, the primer ignites the igniting strip, high temperature is generated by combustion of the igniting strip, so that the combustion improver is decomposed to generate oxygen, the igniting strip is enabled to continuously burn, the igniting strip ignites the heat conducting agent to generate chemical reaction to generate high heat (3000 ℃) and be in a molten state, and the heat conducting agent in the molten state acts on the metal clamping piece after melting the bottom of the anchor head, so that the lining is melted, and the constraint of two steel strands is relieved.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable characteristics:
1. the heating system is activated in a mechanical transmission mode, so that the energy is saved, and the environment is protected;
2. the exothermic process is completed through chemical reaction among substances, and the heat transfer process is completed through substance contact, so that the recovery is more stable and reliable, and the recovery rate of the anchor cable is improved;
3. the metal clamping piece at the bottom of the anchor head is used for fixing the steel stranded wires and increasing the contact area between the anchor head and the anchoring body, so that the anchoring force of the invention is higher;
4. the transmission rope is composed of ultra-high molecular weight polyethylene fibers, and the ultra-high molecular weight polyethylene fiber material has strong impact resistance, cutting resistance, chemical corrosion resistance and wear resistance and has longer deflection life;
5. the bottom cover is made of hot melt type material, and compared with a metal bottom cover, the heat loss of the heat conducting agent in the heat transfer process can be reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a cross-sectional view of the anchor head 8 of the present invention;
fig. 3 is a cross-sectional view of the squeeze heater 6 of the present invention;
fig. 4 is a schematic diagram of the structure of the driving rope 1 of the present invention.
Detailed Description
As shown in fig. 1-2, the hot-melt recoverable U-shaped anchor cable comprises a driving rope 1, an outer anchorage device 2, a cushion 3, an anchor pier 4, a steel strand 5, an extrusion heater 6, a PVC sleeve 7, an anchor head 8, an igniter 9 and a metal clamping piece 10, wherein the anchor head 8 is internally hollowed out, the hollowed-out part is provided with the extrusion heater 6 and the igniter 9, and a groove 11 which is convenient for embedding the steel strand 5 and the metal clamping piece 10 is arranged on the outer shell of the anchor head 8. The two steel strands 5 are distributed along the groove 11 on the anchor head 8, and are connected with the bottom of the anchor head 8 through the metal clamping piece 10 and the bushing 12. The metal clamping piece 10 is cuboid, the length is slightly smaller than the length of the anchor head 8, a gap between the metal clamping piece 10 and the steel stranded wire 5 is filled with a lining 12 made of a hot-melting material, the lining 12 is tightly attached to the metal clamping piece 10, the metal clamping piece 10 is welded in a groove 11 of the anchor head 8, the contact area between the anchor head 8 and an anchor body is increased while the steel stranded wire 5 is fixed, and the anchoring force is increased. The PVC sleeve 7 has smooth inner wall, and is sleeved on the steel stranded wire 5 and the driving rope 1 to be connected with the anchor pier 4.
The igniter 9 comprises a spring limiter 901, a spring 902, a firing pin 903, a transmission rod 904 and a transmission rod limiter 905, wherein the spring limiter 901 is welded with the anchor head shell. Spring 902 is welded to spring retainer 901. Striker 903 is welded to spring 902. The drive rod 904 is hinged to the anchor head housing. The drive rod limiter 905 is welded to the anchor head housing. The metal clip 10 is welded to the outer surface of the anchor head 8.
In the anchoring phase of the hot melt type retractable U-bolt, the spring 902 is in a compressed state, and the transmission rod 904 is limited in rotation by the transmission rod limiter 905, so that one end of the transmission rod abuts against the firing pin 903 to prevent the spring 902 from being stretched. At this time, the spring 902, the striker 903, the transmission rod 904, and the transmission rod stopper 905 are in a force balance state, the transmission rope 1 is welded on the transmission rod stopper 905, and the transmission rope 1 is longer than the anchor cable. The squeeze heater 6 is installed at a position just below the firing pin 904, a distance from the firing pin 904 is smaller than a full extension distance of the spring 902, and a distance from the bottom cover 605 of the squeeze heater 6 to the bottom of the anchor head 8 is smaller than 3cm, so that the firing pin 903 can contact the squeeze heater 6 to ignite the primer 602 in a squeeze manner.
As shown in fig. 3, the extrusion heater 6 is located at the center of the lower part of the anchor head 8 and is welded with the shell of the anchor head 8. The pinch heater 6 includes a constraining case 601, a primer 602, a pilot hole 603, a pilot bar 604, a combustion improver 605, a heat conductive agent 606, and a bottom cover 607. The bottom cover 607 is made of hot melt type material, which reduces the heat loss of the heat conductive agent in the heat transfer process, and the igniting hole 603 is formed by the space left in the middle of the metal grids at two sides. The igniting bar 604 is a magnesium bar, the combustion improver 605 is potassium chlorate, and the heat conducting agent 606 is formed by mixing aluminum powder, ferric oxide powder and ferrosilicon powder. The mixing mass ratio of the aluminum powder to the ferric oxide powder to the ferrosilicon powder is 1:3:1, so that the reaction is easier to carry out, and the reaction time is prolonged to be more sufficient. The larger the particle size of the aluminum powder is, the longer the reaction time is, the higher the temperature generated by the reaction is, the lower the heat loss rate is, but the shorter the propagation time is, the more difficult the ignition is, so the particle size of the aluminum powder is the optimal particle size when the particle size is 1-2 microns. The particle size of ferric oxide powder is smaller than 1 micron, the particle size of ferrosilicon is 1-2 microns, and the particle size can enable the reaction to be more complete. The igniting strip 604 is vertically arranged, one end of the igniting strip is abutted against the primer 602 and sequentially passes through the igniting hole 603, the combustion improver 605 and the heat conducting agent 606, the other end of the igniting strip is inserted into the heat conducting agent 606, and the igniting strip is erected through the extrusion action of particles of the combustion improver 605 and the heat conducting agent 606 and the grids on two sides of the igniting hole 603.
As shown in fig. 4, the transmission rope 1 is made of ultra-high molecular weight polyethylene fiber, the outer surface of the transmission rope 1 is smooth, the outer surface is coated with pasty lubricant, and the PVC sleeve 7 is sleeved, so that the transmission rope is easier to draw out and transmit during recycling.
The application method of the hot-melt recyclable U-shaped anchor cable comprises the following steps:
firstly, when the anchor head 8 is assembled, the spring 902 is in a compressed state, the transmission rod 904 is limited to rotate by the transmission rod limiter 905, one end of the transmission rod 904 props against the firing pin 903 to prevent the spring 902 from elongating, at the moment, the spring 902, the firing pin 903, the transmission rod 904 and the transmission rod limiter 905 are in a stress balance state, and then the transmission rope 1 is welded on the transmission rod limiter 905, and the length of the transmission rope 1 is larger than that of the anchor cable 5;
step two, installing a squeeze heater 6 at a position right below the firing pin 903, wherein the distance between the squeeze heater 6 and the firing pin 903 is smaller than the complete extension distance of the spring 902, and the distance between a bottom cover 607 of the squeeze heater 6 and the bottom of the anchor head 8 is smaller than 3cm;
step three, when assembling the hot-melt recoverable U-shaped anchor cable, nesting the PVC sleeve 7 on the steel strand 5 and the driving rope 1, enabling the steel strand 5 nested with the PVC sleeve 7 to be arranged along a groove 11 on the shell of the anchor head 8, and connecting and fixing the steel strand along the middle position of the bottom of the anchor head 8 through a metal clamping piece 10 embedded with a lining 12, wherein the lining 12 is made of a hot-melt material and is FEP resin, bismaleimide or organic silicon resin;
step four, when the hot-melt recoverable U-shaped anchor cable is installed, the hot-melt recoverable U-shaped anchor cable is installed in a drill hole, and the transmission rope 1 extends out of the hole and grouting is carried out in the drill hole;
and fifthly, measuring the surface hardness of the anchoring material through a rebound instrument to calculate the strength of the anchoring material, and tensioning the steel strand 5 after the anchoring material reaches 75% of the design strength and is more than 15MPa, so that the steel strand 5 is locked after the anchoring material reaches the design tensile force.
Step six, in the anchor cable recovery stage, the external lockset is opened to pull the driving rope 1 outwards, the driving rope 1 drives the driving rod 904 to rotate anticlockwise by a certain angle and then is separated from the firing pin 903, at the moment, the spring 902 is not limited to extend to release elastic potential energy, so that the firing pin 903 impacts the constraint shell 601 of the extrusion type igniter 6 to ignite the primer 602, the primer 602 ignites the primer strip 604, the primer strip 604 combusts to generate high temperature to decompose the combustion improver 605 to generate oxygen so as to enable the primer strip 604 to continuously combust, the primer strip 604 ignites the heat conducting agent 606 to generate chemical reaction to generate high heat and to be in a molten state, and the heat conducting agent 606 in the molten state acts on the metal clamping piece 10 after melting the bottom of the anchor head 8, so that the bushing is melted, and the constraint of the two steel strands 5 is relieved.
And step seven, the separated steel strands 5 are pulled out of the PVC sleeve 7, and are recovered and finished.
Claims (6)
1. A hot-melt recoverable U-shaped anchor rope is characterized in that: comprises a driving rope (1), a steel strand (5), an extrusion heater (6), an anchor head (8), an igniter (9) and a metal clamping piece (10); the transmission rope (1) stretches into the anchor head (8) and is connected with the igniter (9); the inside of the anchor head (8) is provided with a cavity for accommodating the extrusion type heater (6) and the igniter (9), and the outer surface of the anchor head is provided with a groove (11) for embedding the steel stranded wires (5) and the metal clamping pieces (10); the steel strands (5) are embedded into the grooves (11) from two sides and are connected with the bushings (12); the bushing (12) is connected with the metal clamping piece (10); the igniter (9) comprises a spring limiter (901), a spring (902), a firing pin (903), a transmission rod (904) and a transmission rod limiter (905), one end of the spring (902) is connected with the spring limiter (901), the other end of the spring is connected with the firing pin (903), the transmission rod (904) is connected with a transmission rope (1), and the transmission rod (904), the transmission rod limiter (905) and the transmission rope (1) are used for fixing or releasing the firing pin (903); the striker (903) is capable of igniting the extruded heater (6) by striking;
the extrusion type heater (6) comprises a constraint shell (601), a primer (602), a primer hole (603), a primer strip (604), a combustion improver (605), a heat conducting agent (606) and a bottom cover (607), wherein the primer (602), the primer hole (603), the combustion improver (605), the heat conducting agent (606) and the bottom cover (607) are sequentially arranged in the constraint shell (601) along the direction far away from a firing pin (903), one end of the primer strip (604) penetrates through the primer hole (603), and the other end of the primer strip is embedded into the heat conducting agent (606); the bottom cover (607) is made of a hot melt type material;
one end of the driving rope (1) and one end of the steel strand (5) far away from the anchor head (8) sequentially penetrate through the anchor pier (4), the pad seat (3) and the outer anchor (2);
PVC sleeves (7) are respectively sleeved on the driving rope (1) and the steel stranded wires (5).
2. The hot-melt recoverable U-bolt of claim 1, wherein: the igniting strip (604) is a magnesium strip, and the combustion improver (605) is potassium chlorate.
3. The hot-melt recoverable U-bolt of claim 1, wherein: the heat conducting agent (606) comprises aluminum powder, ferric oxide powder and ferrosilicon powder, wherein the particle size of the aluminum powder is 1-2 microns, the particle size of the ferric oxide powder is less than 1 micron, and the particle size of the ferrosilicon powder is 1-2 microns.
4. The hot-melt recoverable U-bolt of claim 1, wherein: the transmission rope (1) is made of ultra-high molecular weight polyethylene fibers.
5. The hot-melt recoverable U-bolt of claim 1, wherein: the surface of the driving rope (1) is smooth and the outer surface of the driving rope is coated with pasty lubricant.
6. The construction method of the hot-melt recoverable U-shaped anchor cable according to any one of claims 1 to 5, which is characterized by comprising the following steps:
step one, the spring (902) is in a compressed state, the transmission rod (904) is limited to rotate through the transmission rod limiter (905), one end of the transmission rod (904) props against the firing pin (903) to prevent the spring (902) from elongating, at the moment, the spring (902), the firing pin (903), the transmission rod (904) and the transmission rod limiter (905) are in a stress balance state, and then the transmission rope (1) is fixed on the transmission rod (904);
secondly, installing a squeezing type heater (6) at a position right below the firing pin (903), wherein the distance between the squeezing type heater (6) and the firing pin (903) is smaller than the complete extension distance of the spring (902), and the distance between the bottom cover (607) and the bottom of the anchor head (8) is smaller than 3cm;
step three, nesting the PVC sleeve (7) on the steel stranded wire (5) and the transmission rope (1), arranging the steel stranded wire (5) nested with the PVC sleeve (7) along a groove (11) on the anchor head (8), and connecting and fixing the steel stranded wire (5) at the middle position of the bottom of the anchor head (8) through a metal clamping piece (10) embedded with a bushing (12);
installing the anchor head (8) into the drill hole, extending the driving rope (1) to the outside of the hole, and grouting into the drill hole;
step five, stretching the steel strand (5) when the grouting material reaches 75% of the design strength and is more than 15MPa, so that the steel strand (5) is locked after the grouting material reaches the design tensile force;
step six, in the anchor cable recovery stage, the driving rope (1) is pulled outwards, the driving rope (1) drives the driving rod (904) to rotate anticlockwise and then is separated from the firing pin (903), at the moment, the spring (902) is not limited, and stretches to release elastic potential energy to enable the firing pin (903) to impact the extrusion type heater (6), high temperature is generated by combustion to enable the bushing (12) to be melted, and the constraint of the steel strand (5) is released;
and seventhly, drawing the separated steel strands (5) out of the PVC sleeve (7), and finishing for the next use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310701449.XA CN116556336B (en) | 2023-06-13 | 2023-06-13 | Hot-melt recyclable U-shaped anchor cable and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310701449.XA CN116556336B (en) | 2023-06-13 | 2023-06-13 | Hot-melt recyclable U-shaped anchor cable and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116556336A CN116556336A (en) | 2023-08-08 |
| CN116556336B true CN116556336B (en) | 2024-02-27 |
Family
ID=87488091
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818718A (en) * | 2015-04-29 | 2015-08-05 | 中国建筑股份有限公司 | Hot-melting self-assembly anchor head for collecting anchor cables |
| CN113356907A (en) * | 2021-07-15 | 2021-09-07 | 中煤第一建设有限公司 | Gob-side entry retaining construction process for coal seam disaster prevention and control |
| CN113565549A (en) * | 2021-08-17 | 2021-10-29 | 辽宁工程技术大学 | Glass fiber reinforced plastic anchor cable supporting method for treating weak broken top plate |
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| US8926230B2 (en) * | 2012-10-11 | 2015-01-06 | Minova Usa, Inc. | Tension cable bolt |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818718A (en) * | 2015-04-29 | 2015-08-05 | 中国建筑股份有限公司 | Hot-melting self-assembly anchor head for collecting anchor cables |
| CN113356907A (en) * | 2021-07-15 | 2021-09-07 | 中煤第一建设有限公司 | Gob-side entry retaining construction process for coal seam disaster prevention and control |
| CN113565549A (en) * | 2021-08-17 | 2021-10-29 | 辽宁工程技术大学 | Glass fiber reinforced plastic anchor cable supporting method for treating weak broken top plate |
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