CN109057842B - Shearing-pulling conversion flexible yielding shearing-resistant anchor rod and construction supporting method thereof - Google Patents
Shearing-pulling conversion flexible yielding shearing-resistant anchor rod and construction supporting method thereof Download PDFInfo
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- CN109057842B CN109057842B CN201811099696.2A CN201811099696A CN109057842B CN 109057842 B CN109057842 B CN 109057842B CN 201811099696 A CN201811099696 A CN 201811099696A CN 109057842 B CN109057842 B CN 109057842B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 50
- 238000010008 shearing Methods 0.000 title claims abstract description 47
- 238000010276 construction Methods 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 173
- 239000010959 steel Substances 0.000 claims abstract description 173
- 239000011435 rock Substances 0.000 claims description 38
- 230000009471 action Effects 0.000 claims description 25
- 238000005553 drilling Methods 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 230000009466 transformation Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000002360 explosive Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
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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
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a shearing-pulling conversion flexible yielding anti-shearing anchor rod which comprises a nut, a tray, an antifriction gasket, a self-aligning ball pad, a threaded steel rod body and a plurality of sections of shearing-pulling conversion flexible yielding combined structures. The shearing-pulling conversion flexible yielding combined structure consists of thread sections at two ends, a lockset, a steel strand in the middle and a steel protection pipe, wherein the thread sections, the lockset and the steel protection pipe are integrally formed steel structures, and the thread sections at two ends of the steel structure are respectively connected with a threaded steel rod body through threads; the steel stranded wires are positioned in the middle of the steel protection pipe, the steel stranded wires are locked with the steel protection pipe through locks, and the steel protection pipe is connected with the threaded steel rod body through threaded sections at two ends; the steel strand is in a bend relaxation state. The shearing-pulling conversion flexible yielding combined structure of the rod body can realize the functions of high pretightening force, flexible yielding and shearing-pulling conversion, and effectively solves the material defect that the existing anchor rod is low in shearing strength and easy to shear.
Description
Technical Field
The invention belongs to the technical field of shear anchor rod support in mine support engineering, and particularly relates to a shear-pull conversion flexible yielding shear anchor rod and a construction support method thereof.
Background
The reinforcement of the anchor rod is mainly characterized by the deformation or movement limitation of the rock strata along the axial direction and tangential direction of the anchor rod, namely, the anchor rod can generate axial tensile action on the crushed and expanded deformation of the rock strata and tangential shearing action on the shearing dislocation of the rock strata. The stock that current is commonly adopted is the screw-thread steel stock, no matter be low strength screw-thread steel stock, still high strength screw-thread steel stock, and the shear strength of stock is all far lower than its tensile strength, and shear strength is about 0.6 times of tensile strength, and is some even lower. However, shear failure of the formation structural face or shear failure of the rock mass itself is an important form of formation failure for the formation. Therefore, in mine support engineering, many bolts have been sheared and broken before they do not exert a large tensile effect, thereby causing failure of the bolt support. Therefore, the technical problems of high tensile strength, low shear strength, extremely easy rod body shearing and the like of the currently adopted anchor rod generally exist, and how to effectively inhibit the shearing damage of the anchor rod and fully exert the tensile effect of the anchor rod becomes a key problem for solving the mechanical property defect of the current anchor rod material.
Disclosure of Invention
The invention provides a shearing-pulling conversion flexible yielding shear-resistant anchor rod and a construction supporting method thereof, and aims to convert shearing acting force of a rock stratum on the rock stratum into drawing acting force of the anchor rod through a shearing-pulling conversion flexible yielding combined structure, so that the technical problems of high tensile strength, low shearing strength, extremely easy shearing of a rod body and the like of the existing anchor rod are effectively solved, and the tensile capacity of the anchor rod is fully exerted.
In order to solve the technical problems, the invention provides a shearing-pulling conversion flexible yielding shear-resistant anchor rod which comprises an anchor rod accessory, a shearing-pulling conversion flexible yielding combined structure, a first threaded steel rod body and a second threaded steel rod body; the anchor rod accessory is arranged at the rear end part of the second threaded steel rod body;
the shearing-pulling conversion flexible yielding combined structure comprises a steel protection pipe and steel strands arranged in the steel protection pipe, wherein inner walls of the front end and the rear end of the steel protection pipe are respectively provided with an inner thread section, the outer circle of the rear end of a first threaded steel rod body and the outer circle of the front end of a second threaded steel rod body are respectively provided with an outer thread section, the outer thread sections of the rear end of the first threaded steel rod body extend into and are connected with the inner thread sections of the front end of the steel protection pipe in a threaded manner, and the outer thread sections of the front end of the second threaded steel rod body extend into and are connected with the inner thread sections of the rear end of the steel protection pipe in a threaded manner;
the inner walls of the front end and the rear end of the steel protection tube are respectively fixedly provided with a lock, the two ends of the steel stranded wire are locked with the steel protection tube through the locks, and the steel stranded wire is in a bending and loosening state.
The threaded connection length of the internal thread section and the external thread section is greater than 40mm so as to ensure that the connection part among the first threaded steel rod body, the second threaded steel rod body and the steel protection pipe has enough bearing capacity.
The length of the steel strand penetrating into the lock is larger than 50mm, so that the steel strand can be locked by the lock when being tensioned, and a surplus length is reserved; the lock comprises an anchor ring and a locking plate, wherein the anchor ring and the steel protection tube are integrally formed, an inner hole of the anchor ring is of a conical structure, the locking plate is provided with three locking plates, the three locking plates are positioned in the inner hole of the anchor ring, the appearance of the three locking plates and the inner hole of the anchor ring are of conical structures, the inner holes of the three locking plates are cylindrical, and the steel stranded wires are arranged in the inner holes of the three locking plates in a penetrating manner; the stretching length of the steel strand is 20-30 mm when in tensioning, and the stretching length can be adjusted according to the construction production requirement.
The anchor rod accessory comprises nuts, a tray, antifriction gaskets and a self-aligning ball pad which are all sleeved on the rear end part of the second threaded steel rod body, the middle part of the tray protrudes backwards to form a bowl-shaped structure, a through hole sleeved on the second threaded steel rod body is formed in the center of the bowl-shaped structure, the self-aligning ball pad is arranged at the edge of the through hole, and the nuts are in press fit with the self-aligning ball pad through the antifriction gaskets.
The positions and the numbers of the shearing-pulling conversion flexible yielding combined structure, the first threaded steel rod body and the second threaded steel rod body are determined by the positions and the numbers of the anchor rods which are easy to shear and break in the rock stratum.
The construction supporting method for the shear-pull conversion flexible yielding shear-resistant anchor rod comprises the following construction steps:
(1) According to the stress condition of surrounding rock to be reinforced by the anchor rod and the rock stratum structure condition of shearing dislocation rock stratum and broken expansion deformation rock stratum, determining design parameters of a nut, a tray, an antifriction gasket, a aligning ball pad, a first threaded steel rod body, a second threaded steel rod body and a shearing-pulling conversion flexible yielding combined structure, and carrying out production processing according to the design parameters;
(2) Assembling the first threaded steel rod body, the second threaded steel rod body and the shearing-pulling conversion flexible yielding combined structure according to a design structure; when in assembly, the shearing-pulling conversion flexible yielding combined structure is arranged at a shearing dislocation rock layer section;
(3, according to the positions, the interval row spacing and the angles of the anchor rod eyes, the anchor rod eyes are drilled by an anchor rod drilling machine, the diameters of the anchor rod eyes are 10-12 mm larger than the diameters of the first threaded steel rod body and the second threaded steel rod body, and the maximum outer diameter of the shear-pull conversion flexible yielding combined structure is 4-6 mm;
(4) After the anchor rod eye is arranged, the front end of the first threaded steel rod body is adopted to send the resin cartridge into the anchor rod fundus, the drilling machine is matched with the stirrer to drive the first threaded steel rod body to stir the resin cartridge, after the resin cartridge is solidified, the tray, the aligning ball pad, the antifriction gasket and the nut are sequentially installed, the pre-tightening torque is applied by adopting the drilling machine and multiple nuts, and then the anchor rod installation is completed.
In the supporting process, the nut is screwed by the drilling machine, so that the steel protection pipe has higher stretching pre-tightening force, and simultaneously, under the rock stratum shearing action of the shearing staggered rock stratum section, the steel protection pipe can provide higher shearing capacity, and after the steel protection pipe is sheared and broken, a steel stranded wire in a loose state in the middle of the steel protection pipe starts to bend and stretch, so that the shearing action of the rock stratum is flexible and yielding; when the steel strand is tensioned under the shearing action of the strata, the steel strand plays an axial tensile action on the strata, namely, the tangential shearing action is converted into the axial tensile action.
In the supporting process, the adopted nut is a thickened nut, the adopted tray is an arch tray, the adopted antifriction gasket can reduce friction loss when installation torque is converted into pretightening force, and the adopted aligning ball pad enables the nut to be in close contact with the tray and the nut, so that the tail of the anchor rod is prevented from being broken due to stress concentration caused by local contact.
By adopting the technical scheme, the steel protection tube has certain tensile strength and shear strength, and can provide higher stretching pre-tightening force by tightening the nut when the anchor rod is installed; the steel guard tube may provide a higher shear capacity when shear misalignment of the rock formation of the anchor bolt support occurs.
The nut is the thickening nut, and the tray is the arch tray, friction loss when antifriction gasket can reduce installation moment of torsion and change pretightning force, and aligning ball pad can guarantee its self and tray and the closely knit contact of nut, avoids local contact to produce stress concentration and causes the stock afterbody to break.
The invention has the following beneficial effects: according to the invention, the shearing-pulling conversion flexible yielding combined structure is added between the first threaded steel rod body and the second threaded steel rod body, so that the technical problems of high tensile strength, low shearing strength, extremely easy rod body shearing and the like of the existing anchor rod can be effectively solved, and the following aspects are specifically realized: firstly, the steel protective tube of the structure has certain tensile strength and shear strength, can apply larger pretightening force when the anchor rod is installed, and provides higher tensile capacity and shear capacity; secondly, after the shearing acting force of the rock stratum exceeds the shearing strength of the steel protection pipe to break, the steel stranded wire in a loose state in the middle of the steel protection pipe starts to bend and stretch, so that the loose steel stranded wire can play a flexible yielding role in the shearing action of the rock stratum; thirdly, when the steel strand is tensioned under the shearing action of the strata, the steel strand starts to exert an axial tensile action on the strata, namely, the tangential shearing action is converted into the axial tensile action. In a word, through increasing the flexible pressure integrated configuration that lets that shears draws conversion, can realize that the stock "high pretightning force, flexibility lets pressure, shears draw conversion" function, effectively solve the material defect problem that "shear strength is low, the body of rod is extremely easily sheared" that current stock exists to provide the guarantee for the tensile ability of full play stock. .
Drawings
FIG. 1 is a cross-sectional view of a shear-pull conversion flexible yielding shear-resistant anchor rod anchoring structure of the present invention;
FIG. 2 is a cross-sectional view of a shear-pull conversion flexible yielding combination structure according to the present invention;
FIG. 3 is a perspective view of a lock structure of the steel strand of the present invention;
fig. 4 is a top view of fig. 3.
In fig. 1-4: the anti-friction nut comprises a nut, a tray, an antifriction gasket, a aligning ball pad, a first threaded steel rod body, a shearing-pulling conversion flexible yielding combined structure, an internal thread section, a lockset, a steel stranded wire, a steel protection tube, an anchor ring, a locking plate, a shearing dislocation rock layer, a broken expansion deformation rock layer, an anchor rod eye, a resin cartridge and a second threaded steel rod body, wherein the nut, the tray, the antifriction gasket, the self-aligning ball pad, the first threaded steel rod body, the shearing-pulling conversion flexible yielding combined structure and the second threaded steel rod body are respectively arranged in sequence, the nut, the friction-reducing gasket and the self-aligning steel rod body are respectively arranged in sequence, the nut, the tray, the friction-reducing gasket, the aligning ball pad, the first threaded steel rod body and the first threaded steel rod body are respectively arranged in sequence, the shearing-pulling conversion flexible yielding combined structure, the shearing-pulling flexible yielding is composed of a first threaded steel rod body, the whole, the steel rod body is composed of a steel protection tube, an anchor ring, the nut, the whole, the locking layer, and the shearing and comprises, and comprises the shearing and a shear.
Detailed Description
As shown in fig. 1-4, the shearing-pulling conversion flexible yielding shear-resistant anchor rod comprises an anchor rod accessory, a shearing-pulling conversion flexible yielding combined structure 6, a first threaded steel rod body 5 and a second threaded steel rod body 17; the anchor rod accessory is arranged at the rear end part of the second threaded steel rod body 17;
the shear-pull conversion flexible yielding combined structure 6 comprises a steel protection tube 10 and steel strands 9 arranged in the steel protection tube 10, wherein inner walls of the front end and the rear end of the steel protection tube 10 are respectively provided with an inner thread section 7, the outer circle of the rear end of a first threaded steel rod body 5 and the outer circle of the front end of a second threaded steel rod body 17 are respectively provided with an outer thread section, the outer thread sections of the rear end of the first threaded steel rod body 5 extend into and are connected with the inner thread sections 7 of the front end of the steel protection tube 10 in a threaded manner, and the outer thread sections of the front end of the second threaded steel rod body 17 extend into and are connected with the inner thread sections 7 of the rear end of the steel protection tube 10 in a threaded manner;
the inner walls of the front end and the rear end of the steel protection tube 10 are respectively fixedly provided with a lock 8, two ends of the steel stranded wire 9 are locked with the steel protection tube 10 through the locks 8, and the steel stranded wire 9 is in a bending relaxation state.
The threaded connection length of the internal thread section 7 and the external thread section should be greater than 40mm in order to ensure that the connection between the first threaded steel rod body 5, the second threaded steel rod body 17 and the steel guard pipe 10 has sufficient load-carrying capacity.
The length of the steel strand 9 penetrating into the lock 8 is larger than 50mm, so that the steel strand 9 can be locked by the lock 8 when being tensioned, and a surplus length is reserved; the lockset 8 comprises an anchor ring 11 and a locking plate 12, wherein the anchor ring 11 and the steel protection tube 10 are integrally formed, the inner hole of the anchor ring 11 is of a conical structure, three locking plates 12 are arranged in the inner hole of the anchor ring 11, the three locking plates 12 and the inner hole of the anchor ring 11 are of conical structures, the inner holes of the three locking plates 12 are cylindrical, and the steel stranded wires 9 are arranged in the inner holes of the three locking plates 12 in a penetrating manner; the stretching length of the steel strand 9 is 20-30 mm when in tensioning, and the stretching length can be adjusted according to the construction production requirement.
The stock annex is including all overlapping the nut 1, tray 2, antifriction gasket 3 and the aligning ball pad 4 of establishing in the tip behind the second screw-thread steel body of rod 17, and the rearward protrusion in tray 2 middle part forms bowl form structure, and the center department of bowl form structure has seted up the perforation of cover to the second screw-thread steel body of rod 17, and aligning ball pad 4 sets up in the fenestrate edge, and nut 1 passes through antifriction gasket 3 and aligning ball pad 4 crimping cooperation.
The positions and the numbers of the shearing-pulling conversion flexible yielding combined structure 6, the first threaded steel rod body 5 and the second threaded steel rod body 17 are determined by the positions and the numbers of the anchor rods which are easy to shear and break in the rock stratum.
The invention relates to a construction supporting method for a shear-pull conversion flexible yielding shear-resistant anchor rod, which comprises the following construction steps:
(1) According to the stress condition of surrounding rock to be reinforced by the anchor rod and the rock stratum structure condition of shearing dislocation rock stratum 13 and crushing expansion deformation rock stratum 14, determining design parameters of nut 1, tray 2, antifriction pad 3, aligning ball pad 4, first screw thread steel rod body 5, second screw thread steel rod body 17 and shearing-pulling conversion flexible yielding combined structure 6, and carrying out production processing according to the design parameters;
(2) The first screw-thread steel rod body 5, the second screw-thread steel rod body 17 and the shearing-pulling conversion flexible yielding combined structure 6 are assembled according to a designed structure; when in assembly, the shearing-pulling conversion flexible yielding combined structure 6 is arranged on the section 13 of the shearing dislocation rock stratum;
(3, according to the positions, the interval row distances and the angles of the anchor rod eyes 15, the anchor rod eyes 15 are drilled by an anchor rod drilling machine, the diameter of the anchor rod eyes 15 is 10-12 mm larger than the diameters of the first threaded steel rod body 5 and the second threaded steel rod body 17, and the maximum outer diameter of the shear-pull conversion flexible yielding combined structure 6 is 4-6 mm;
(4) After the anchor rod eye 15 is finished, the front end of the first threaded steel rod body 5 is adopted to send the resin explosive cartridge 16 into the bottom of the anchor rod eye 15, the drilling machine is adopted to cooperate with the stirrer to drive the first threaded steel rod body 5 to stir the resin explosive cartridge 16, after the resin explosive cartridge 16 is solidified, the tray 2, the aligning ball pad 4, the antifriction gasket 3 and the nut 1 are sequentially installed, the nut 1 is screwed by the drilling machine to apply pre-tightening torque, and then the anchor rod installation is completed.
In the supporting process, the nut 1 is screwed by the drilling machine, so that the steel protection pipe 10 has higher stretching pre-tightening force, the steel protection pipe 10 can provide higher shearing capacity under the rock stratum shearing action of the shearing dislocation rock stratum section 13, and after the steel protection pipe 10 is sheared and broken, the steel stranded wires 9 in a loose state in the middle of the steel protection pipe 10 start to bend and stretch, and the shearing action of the rock stratum is flexibly yielding; when the steel strand 9 is tensioned under the shearing action of the strata, the steel strand 9 plays an axial tensile action on the strata, i.e. corresponds to converting the tangential shearing action into an axial tensile action.
In the supporting process, the adopted nut 1 is a thickened nut, the adopted tray 2 is an arch tray, the adopted antifriction gasket 3 can reduce friction loss when installation torque is converted into pretightening force, and the adopted aligning ball pad 4 enables the nut to be in close contact with the tray 2 and the nut 1, so that the tail of an anchor rod is prevented from being broken due to stress concentration caused by local contact.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.
Claims (8)
1. The flexible pressure-yielding shearing-resistant anchor rod for shearing and pulling transformation is characterized in that: the flexible compression combined structure comprises an anchor rod accessory, a shear-pull conversion flexible compression combined structure, a first threaded steel rod body and a second threaded steel rod body; the anchor rod accessory is arranged at the rear end part of the second threaded steel rod body; the shearing-pulling conversion flexible yielding combined structure comprises a steel protection pipe and steel strands arranged in the steel protection pipe, wherein inner walls of the front end and the rear end of the steel protection pipe are respectively provided with an inner thread section, the outer circle of the rear end of a first threaded steel rod body and the outer circle of the front end of a second threaded steel rod body are respectively provided with an outer thread section, the outer thread sections of the rear end of the first threaded steel rod body extend into and are connected with the inner thread sections of the front end of the steel protection pipe in a threaded manner, and the outer thread sections of the front end of the second threaded steel rod body extend into and are connected with the inner thread sections of the rear end of the steel protection pipe in a threaded manner; the inner walls of the front end and the rear end of the steel protection tube are respectively fixedly provided with a lock, the two ends of the steel stranded wire are locked with the steel protection tube through the locks, and the steel stranded wire is in a bending and loosening state;
under the rock stratum shearing action of the shearing dislocation rock stratum section, the steel protection pipe can provide higher shearing capacity, and after the steel protection pipe is sheared and broken, the steel stranded wires in the middle of the steel protection pipe and in a loose state begin to bend and stretch, and the shearing action of the rock stratum is flexible and yielding.
2. The shear-pull conversion flexible yielding shear anchor of claim 1, wherein: the threaded connection length of the internal thread section and the external thread section is greater than 40mm so as to ensure that the connection part among the first threaded steel rod body, the second threaded steel rod body and the steel protection pipe has enough bearing capacity.
3. The shear-pull conversion flexible yielding shear anchor of claim 2, wherein: the length of the steel strand penetrating into the lock is larger than 50mm, so that the steel strand can be locked by the lock when being tensioned, and a surplus length is reserved; the lock comprises an anchor ring and a locking plate, wherein the anchor ring and the steel protection tube are integrally formed, an inner hole of the anchor ring is of a conical structure, the locking plate is provided with three locking plates, the three locking plates are positioned in the inner hole of the anchor ring, the appearance of the three locking plates and the inner hole of the anchor ring are of conical structures, the inner holes of the three locking plates are cylindrical, and the steel stranded wires are arranged in the inner holes of the three locking plates in a penetrating manner; the stretching length of the steel strand is 20-30 mm when in tensioning, and the stretching length can be adjusted according to the construction production requirement.
4. A shear pull conversion flexible yielding shear anchor as claimed in claim 3, wherein: the anchor rod accessory comprises nuts, a tray, antifriction gaskets and a self-aligning ball pad which are all sleeved on the rear end part of the second threaded steel rod body, the middle part of the tray protrudes backwards to form a bowl-shaped structure, a through hole sleeved on the second threaded steel rod body is formed in the center of the bowl-shaped structure, the self-aligning ball pad is arranged at the edge of the through hole, and the nuts are in press fit with the self-aligning ball pad through the antifriction gaskets.
5. The shear pull conversion flexible yielding shear anchor of claim 4, wherein: the positions and the numbers of the shearing-pulling conversion flexible yielding combined structure, the first threaded steel rod body and the second threaded steel rod body are determined by the positions and the numbers of the anchor rods which are easy to shear and break in the rock stratum.
6. The construction supporting method for the shear-pull conversion flexible yielding shear-resistant anchor rod as claimed in claim 5, wherein the construction steps are as follows:
(1) According to the stress condition of surrounding rock to be reinforced by the anchor rod and the rock stratum structure condition of shearing dislocation rock stratum and broken expansion deformation rock stratum, determining design parameters of a nut, a tray, an antifriction gasket, a aligning ball pad, a first threaded steel rod body, a second threaded steel rod body and a shearing-pulling conversion flexible yielding combined structure, and carrying out production processing according to the design parameters;
(2) Assembling the first threaded steel rod body, the second threaded steel rod body and the shearing-pulling conversion flexible yielding combined structure according to a design structure; when in assembly, the shearing-pulling conversion flexible yielding combined structure is arranged at a shearing dislocation rock layer section;
according to the positions, the interval row distances and the angles of the anchor rod eyes, an anchor rod drilling machine is adopted to drill the anchor rod eyes, the diameter of the anchor rod eyes is 10-12 mm larger than the diameters of the first threaded steel rod body and the second threaded steel rod body, and the maximum outer diameter of the shear-pull conversion flexible yielding combined structure is 4-6 mm larger;
(3) After the anchor rod eye is arranged, the front end of the first threaded steel rod body is adopted to send the resin cartridge into the anchor rod fundus, the drilling machine is matched with the stirrer to drive the first threaded steel rod body to stir the resin cartridge, after the resin cartridge is solidified, the tray, the aligning ball pad, the antifriction gasket and the nut are sequentially installed, the drilling machine is adopted to apply pre-tightening torque to the nut, and then the anchor rod installation is completed.
7. The construction support method for the shear-pull conversion flexible yielding shear-resistant anchor rod as claimed in claim 6, wherein the construction support method comprises the following steps: in the supporting process, the nut is screwed by the drilling machine, so that the steel protection pipe has higher stretching pre-tightening force; when the steel strand is tensioned under the shearing action of the strata, the steel strand plays an axial tensile action on the strata, namely, the tangential shearing action is converted into the axial tensile action.
8. The construction support method for the shear-pull conversion flexible yielding shear-resistant anchor rod as claimed in claim 6, wherein the construction support method comprises the following steps: in the supporting process, the adopted nut is a thickened nut, the adopted tray is an arch tray, the adopted antifriction gasket can reduce friction loss when installation torque is converted into pretightening force, and the adopted aligning ball pad enables the nut to be in close contact with the tray and the nut, so that the tail of the anchor rod is prevented from being broken due to stress concentration caused by local contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811099696.2A CN109057842B (en) | 2018-09-20 | 2018-09-20 | Shearing-pulling conversion flexible yielding shearing-resistant anchor rod and construction supporting method thereof |
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| CN201811099696.2A CN109057842B (en) | 2018-09-20 | 2018-09-20 | Shearing-pulling conversion flexible yielding shearing-resistant anchor rod and construction supporting method thereof |
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| CN109057842A CN109057842A (en) | 2018-12-21 |
| CN109057842B true CN109057842B (en) | 2024-01-26 |
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| CN109883779B (en) * | 2019-01-21 | 2021-04-20 | 宁波大学 | Design method for size effect shear test of anchoring structure surface |
| CN111577339B (en) * | 2020-04-21 | 2021-09-28 | 中国建筑股份有限公司 | High-ground-stress soft rock tunnel supporting structure system and construction method thereof |
| CN113026739B (en) * | 2021-04-16 | 2022-01-18 | 中国矿业大学 | Self-adaptive friction type anti-shearing large-deformation anchor rod |
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