Anchor rod end treatment process for improving pulling resistance of anchor rod

Abstract

The invention relates to the technical field of anchor rods, and discloses an anchor rod end treatment process for improving the pulling resistance of an anchor rod. Comprising the following steps that S01, parameter design is conducted, specifically, according to tension and compression parameter design requirements of an anchor rod and geological parameters of anchor rod installation surrounding rock, the installation position of the anchor rod is determined in an anchor rod installation surrounding rock area, after the installation position of the anchor rod is determined, the installation position of the anchor rod is marked, an anchor hole is formed according to the mark, the radius of the anchor hole is defined as R1, and the depth of the anchor hole is defined as L1; and S02, cutting is conducted, after the step S01, the anchor rod with the specified specification is selected, the radius of the anchor rod is defined as R2, the length of the anchor rod is defined as L2, and R2 is 0.45-0.55 times of the radius of R1. According to the method, the cutting process of the end of the anchor rod is set, the pulling resistance of the anchor rod can be increased by increasing the size and rigidity of the anchoring end of the anchor rod, and the pulling resistance of the anchor rod is greatly improved on the premise that the material cost is not increased by conducting secondary machining treatment on the anchor rod.

Description

Technical Field

[0001] The invention relates to the technical field of anchor rods, in particular to an anchor rod end treatment process for improving the pull-out resistance of the anchor rod. Background Art

[0002] Soil anchor bolting technology originated in the last century. Soil anchor bolt refers to drilling holes in the unexcavated soil layer of the foundation soil wall. After reaching a certain depth, steel bars, steel pipes, steel wire bundles, steel strands and other materials are placed in the holes, and mud or chemical slurry is poured in to make them combine with the soil layer to form an anchor bolt with strong tensile (pull-out) resistance. The end of the anchor bolt is connected to the retaining wall pile to prevent the soil wall from collapsing or landslide.

[0003] Soil anchor rods are widely used in transportation, water conservancy, construction, electricity, municipal administration, mining and other fields. At present, my country still mainly uses cement grouting anchor rods in terms of construction methods. However, traditional anchor rods mostly use straight rod structures when in use. Due to the limitations of the straight rod structure, the anti-pullout strength of the anchor rod is relatively limited. Although some anchor rod strengthening processes have appeared in the prior art, such as the patent document with publication number CN110566256B, a rock anchoring method of a mechanical linkage anti-pullout anchor rod is disclosed, including a fixed structure, a linkage structure, an adjustment mechanism and a passive anti-pullout mechanism, wherein a linkage structure is installed inside the fixed structure. An adjustment mechanism and a passive pull-out resistance mechanism are installed on the outside of the fixed structure, and the linkage structure and the adjustment mechanism are connected to each other. Under the obstruction of the groove wall rock formation, the anchor sleeve cannot continue to be pulled out, and the greater the pull-out force or the greater the pull-out displacement, the greater the blocking force on the anchor sleeve, which is not conducive to the pull-out of the anchor sleeve and has a passive pull-out resistance effect. However, the above processing technology is not convenient for improving the pull-out resistance of the anchor without increasing the material cost by performing secondary processing on the anchor itself. Based on this, the present invention provides an anchor end processing process for improving the pull-out resistance of the anchor to solve the technical problems raised in the above background technology. Summary of the invention

[0004] The purpose of the present invention is to provide an anchor rod end treatment process for improving the pull-out resistance of the anchor rod, which solves the problem that the existing anchor rod pull-out resistance improvement process proposed in the background technology is not convenient for secondary processing of the anchor rod itself, and improves the pull-out resistance of the anchor rod without increasing the material cost. In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A process for treating an anchor end for improving the pull-out resistance of an anchor, comprising the following steps:

[0006] S01, parameter design: According to the design requirements of the tension and compression parameters of the anchor rod and the geological parameters of the surrounding rock where the anchor rod is installed, the installation position of the anchor rod is determined in the surrounding rock area where the anchor rod is installed. After the installation position of the anchor rod is determined, the anchor rod installation position is marked, and an anchor hole is opened according to the mark. The radius of the anchor hole is limited to R1, and the depth of the anchor hole is limited to L1;

[0007] S02, cutting. After step S01, an anchor rod with specified specifications is selected. The radius of the anchor rod is limited to R2, and the length of the anchor rod is limited to L2. R2 is 0.45 times to 0.55 times the radius of R1, and L2 is 0.8 times to 0.9 times of L1. After the specifications of the anchor rod are specified, a specified length L3 is cut from the middle position of the anchor rod end. L3 is 0.5 times to 1.1 times R1. After the anchor rod end is cut from the middle position, the end of the anchor rod is divided into two parts;

[0008] S03, welding, select the short steel bar to be installed, the radius of the short steel bar is limited to R3, R3 is 0.4 times to 0.5 times of R2, the length of the short steel bar is limited to L4, L4 is 2.01 times to 2.05 times of R1, after the radius and length of the short steel bar are determined, use the ejection tool to push the two parts of the anchor rod end into a "V" shape, and weld the short steel bar between the two parts of the anchor rod end;

[0009] S04, wear-resistant treatment, after step S03, the two separated parts of the anchor rod end, the short steel bar and the welding position are quenched, and after the quenching treatment is completed, a Ni-TiN coating is deposited on the above parts by using a pulse electrodeposition method to improve the wear resistance and hardness of the above parts;

[0010] Preferably, a process for treating the end of an anchor rod to improve the pull-out resistance of the anchor rod further comprises the following steps:

[0011] S05, initial spraying of concrete, with the anchor hole as the center, is performed on the outer surface of the surrounding rock where the anchor rod is installed. After the concrete in the initial spraying of concrete is semi-solidified, a steel mesh is implanted in the semi-solidified concrete, and the concrete of the initial spraying of concrete is fully solidified;

[0012] S06, one-time pouring, cleaning the anchor hole opened in step S01, after the cleaning is completed, placing a pouring casing on the inner wall of the anchor hole, the outer diameter of the pouring casing is set to R4, R4 is 0.85 times to 0.95 times of R1, before the one-time pouring, an external auxiliary positioning mechanism is used to set the pouring casing and the anchor hole at the same time, after the positioning is completed, one-time pouring is performed between the pouring casing and the anchor hole;

[0013] S07, screwing in. When the concrete poured once is half solidified, the casting casing is removed from the anchor hole. After the casting casing is removed, the anchor rod processed in step S04 is screwed into the anchor hole by using an anchor drill. When the anchor rod is screwed in, the screwing speed is set to 0.5 cm / min.

[0014] S08, primary angle expansion, using a knocking mechanical arm to knock the anchor rod screwed into the anchor hole back and forth for a specified time toward the inside of the anchor hole, and causing the short steel bar to encounter resistance to increase the angle between the two parts of the anchor rod end;

[0015] S09, secondary pouring, performing secondary segmented pouring of slurry into the anchor hole;

[0016] S10, secondary angle expansion: after step S08, the anchor rod is reciprocatedly struck for a second time by a striking mechanical arm to further increase the angle between the two parts of the anchor rod end, and the mud surface is smoothed after the striking mechanical arm strikes for a specified time;

[0017] S11, implantation, when the slurry filled in step S09 is fully solidified, a pad is implanted on the outer surface of the steel mesh, and the end of the anchor rod passes through the pad. After the anchor rod passes through, a nut is used to connect the anchor rod, the pad and the steel mesh into one;

[0018] S12, spray concrete again, spray concrete again on the top of the pad, wait for the sprayed concrete to solidify, and then complete the processing and installation and fixation of the anchor head.

[0019] Preferably, in step S01, the marking includes information on the height, angle, diameter and depth of the anchor hole.

[0020] Preferably, in step S03, the two separated parts of the anchor rod end each have an outermost endpoint, and after the short steel bar is welded, the distance between the two outermost endpoints should be limited to D, and D is 2.05 times to 2.2 times of R1.

[0021] Preferably, in the step S06, during the primary pouring, the concrete used during the primary pouring is expansive concrete.

[0022] Preferably, in step S08, the specified time for one reciprocating knocking is 5 minutes to 15 minutes, and the specified time for two reciprocating knockings in step S10 is 2 minutes to 6 minutes.

[0023] Preferably, in the step S09, the pouring is divided into a first pouring section and a second dosing section. When pouring the first pouring section, a resin anchor is used to form a resin anchor section. After the resin anchor is filled, the resin anchor section poured into the anchor hole is stirred. After stirring, a second dosing is performed on the resin anchor section.

[0024] Furthermore, during the secondary dosing, a mixture of expansive cement rolls and quick-hardening cement slurry is used, and finally a medicinal mud anchoring section is formed. When the medicinal mud anchoring section is formed, fine stones are filled into the mud. After the fine stones are filled, a vibrating rod is inserted into the mud and vibrated for 2min-3min, and the vibrating rod is removed. By adding fine stones, the stability of the anchor rod in the anchor hole is improved, and the stress of the anchor rod and the friction between the anchor rod and the anchor hole are fully improved, thereby improving the pull-out resistance of the anchor rod in multiple effects.

[0025] Preferably, in step S09, the particle size of the fine stone is 0.4 cm-4 cm, and the filling amount of the fine stone is 30%-55% of the filling amount of the mixture of the expansive cement roll and the rapid hardening cement slurry in step S09.

[0026] Preferably, in step S09, the length of the resin anchoring section is 0.5 to 0.7 times the length of the anchor rod, and the length of the medicinal mud anchoring section is 0.3 to 0.5 times the length of the anchor rod.

[0027] Preferably, in step S02, the anchor rod adopts a longitudinal rib-free threaded steel anchor rod or an equal-strength threaded steel anchor rod.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0029] 1. The present invention can increase the pull-out resistance of the anchor rod by increasing the volume and rigidity of the anchoring end of the anchor rod through the cutting process setting of the anchor rod end. In addition, this processing method greatly improves the pull-out resistance of the anchor rod without increasing the material cost by performing secondary processing on the anchor rod itself, thereby solving the problem of insufficient pull-out force of the anchor rod in the past.

[0030] 2. The present invention can effectively improve the connection strength between the anchor rod end and the anchor hole through the setting of the anchor rod screw-in processing flow, and can open a thread groove on the inner wall of the semi-solidified concrete on the other hand. By opening the thread groove, the tensile strength of the anchor rod can be effectively improved. At the same time, by opening the thread groove, the connectable area between the semi-solidified concrete and the secondary casting can be effectively increased, thereby assisting in improving the fixing stability of the anchor rod in the anchor hole.

[0031] 3. The present invention can, through primary and secondary angle expansion treatments during anchor installation, enable the anchor to penetrate further into the anchor hole and fully increase the volume of the anchor end, and can effectively improve the connection strength and friction strength between the two separate parts of the anchor end and the anchor hole, thereby effectively increasing the pull-out resistance of the anchor end. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of an anchor after installation in an anchor end treatment process for improving the pull-out resistance of the anchor;

[0033] Figure 2 The present invention is a schematic diagram of the process structure of an anchor rod end treatment process for improving the pull-out resistance of the anchor rod. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1

[0036] See also Figure 1-2 , a bolt end treatment process for improving the pull-out resistance of the bolt, comprising the following steps:

[0037] S01, parameter design: According to the design requirements of the tension and compression parameters of the anchor rod and the geological parameters of the surrounding rock where the anchor rod is installed, the installation position of the anchor rod is determined in the surrounding rock area where the anchor rod is installed. After the installation position of the anchor rod is determined, the anchor rod installation position is marked, and an anchor hole is opened according to the mark. The radius of the anchor hole is limited to R1, and the depth of the anchor hole is limited to L1;

[0038] In step S01, the marking includes the height, angle, diameter and depth information of the anchor hole;

[0039] S02, cutting. After step S01, an anchor rod with specified specifications is selected. The radius of the anchor rod is limited to R2, and the length of the anchor rod is limited to L2. R2 is 0.45 times the radius of R1, and L2 is 0.8 times L1.

[0040] After the anchor specifications are determined, a designated length L3 is cut from the middle of the anchor end, and L3 is 0.5 times of R1;

[0041] In step S02, the anchor rod adopts a threaded steel anchor rod without longitudinal ribs;

[0042] After the anchor rod end is cut from the middle position, the end of the anchor rod is divided into two parts;

[0043] S03, welding, select the short steel bar to be installed, the radius of the short steel bar is limited to R3, R3 is 0.4 times of R2, the length of the short steel bar is limited to L4, L4 is 2.01 times of R1, after the radius and length of the short steel bar are determined, use the ejection tool to push the two parts of the anchor rod end into a "V" shape, and weld the short steel bar between the two parts of the anchor rod end;

[0044] Through the above-mentioned cutting process setting, the pull-out resistance of the anchor rod can be increased by increasing the volume and rigidity of the anchoring end of the anchor rod;

[0045] At the same time, by performing secondary processing on the anchor rod itself, the pull-out resistance of the anchor rod is greatly improved without increasing the material cost, solving the problem of insufficient pull-out force of the anchor rod in the past;

[0046] In step S03, the two parts separated from the anchor rod end each have an outermost end point. After the short steel bar is welded, the distance between the two outermost end points should be limited to D, which is 2.05 times of R1.

[0047] S04, wear-resistant treatment, after step S03, the two separated parts of the anchor rod end, the short steel bar and the welding position are quenched, and after the quenching treatment is completed, a Ni-TiN coating is deposited on the above parts by using a pulse electrodeposition method to improve the wear resistance and hardness of the above parts;

[0048] Through wear-resistant treatment, the structural strength and service life of the anchor end can be effectively improved;

[0049] S05, initial spraying of concrete, with the anchor hole as the center, is performed on the outer surface of the surrounding rock where the anchor rod is installed. After the concrete in the initial spraying of concrete is semi-solidified, a steel mesh is implanted in the semi-solidified concrete, and the concrete of the initial spraying of concrete is fully solidified;

[0050] S06, pouring once, cleaning the anchor hole opened in step S01, after which a casting casing is placed on the inner wall of the anchor hole, the outer diameter of the casting casing is set to R4, which is 0.85 times of R1;

[0051] Before the first pouring, an external auxiliary positioning mechanism is used to set the pouring casing and the anchor hole at the same time. After the positioning is completed, a pouring is performed between the pouring casing and the anchor hole.

[0052] The casting casing is a hollow tubular structure with openings at both ends;

[0053] In step S06, during the first pouring, the concrete used during the first pouring is expansive concrete;

[0054] S07, screwing in. When the concrete poured once is half solidified, the casting casing is removed from the anchor hole. After the casting casing is removed, the anchor rod processed in step S04 is screwed into the anchor hole by using an anchor drill. When the anchor rod is screwed in, the screwing speed is set to 0.5 cm / min.

[0055] By setting the screw-in processing flow of the anchor rod, on the one hand, the connection strength between the anchor rod end and the anchor hole can be effectively improved, and on the other hand, a thread groove can be opened on the inner wall of the semi-solidified concrete, and the tensile strength of the anchor rod can be effectively improved by opening the thread groove;

[0056] At the same time, by opening the thread groove, the connection area between the semi-solidified concrete and the secondary pouring can be effectively increased, thereby helping to improve the fixing stability of the anchor rod in the anchor hole;

[0057] S08, primary angle expansion, using a knocking mechanical arm to knock the anchor rod screwed into the anchor hole back and forth for a specified time toward the inside of the anchor hole, and causing the short steel bar to encounter resistance to increase the angle between the two parts of the anchor rod end;

[0058] In step S08, the specified time for one reciprocating tapping is 5 minutes;

[0059] Through the one-time angle expansion, on the one hand, the anchor rod can be further inserted into the anchor hole and the volume of the anchor rod end can be fully increased; on the other hand, the connection strength and friction strength between the two separated parts of the anchor rod end and the anchor hole can be effectively improved, thereby effectively increasing the pull-out resistance of the anchor rod end;

[0060] S09, secondary pouring, performing secondary segmented pouring of slurry into the anchor hole;

[0061] In step S09, the pouring is divided into a first pouring section and a second dosing section. When the first pouring section is poured, a resin anchoring agent is used to form a resin anchoring section. After the resin anchoring agent is filled, the resin anchoring section poured into the anchor hole is stirred. After stirring, a secondary dosing is performed on the resin anchoring section. During the secondary dosing, a mixture of an expansive cement roll and a fast-hardening cement slurry is used to finally form a drug mud anchoring section. When the drug mud anchoring section is formed, fine stones are filled into the mud. After the fine stones are filled, a vibrating rod is inserted into the mud and vibrated for 2 minutes, and the vibrating rod is removed. The addition of fine stones can improve the stability of the anchor rod in the anchor hole, and fully improve the stress of the anchor rod and the friction between the anchor rod and the anchor hole, thereby improving the pull-out resistance of the anchor rod in multiple ways;

[0062] In step S09, the particle size of the fine stone is 0.4 cm, and the filling amount of the fine stone is 30% of the filling amount of the mixture of the expansion cement roll and the rapid hardening cement slurry in step S09;

[0063] In step S09, the length of the resin anchoring section is 0.5 times the length of the anchor rod, and the length of the medicinal mud anchoring section is 0.3 times the length of the anchor rod;

[0064] S10, secondary angle expansion: after step S08, the anchor rod is reciprocatedly struck for a second time by a striking mechanical arm to further increase the angle between the two parts of the anchor rod end, and the mud surface is smoothed after the striking mechanical arm strikes for a specified time;

[0065] The specified time for the second reciprocating tapping in step S10 is 2 minutes;

[0066] Through the secondary expansion angle, on the one hand, the anchor rod can be further inserted into the anchor hole, and on the other hand, the connection strength and friction strength between the two separated parts of the anchor rod end and the anchor hole can be effectively improved, thereby effectively increasing the pull-out resistance of the anchor rod end;

[0067] S11, implantation, when the slurry filled in step S09 is fully solidified, a pad is implanted on the outer surface of the steel mesh, and the end of the anchor rod passes through the pad. After the anchor rod passes through, a nut is used to connect the anchor rod, the pad and the steel mesh into one;

[0068] S12, spray concrete again, spray concrete again on the top of the pad, wait for the sprayed concrete to solidify, and then complete the processing and installation and fixation of the anchor head.

[0069] Embodiment 2

[0070] See also Figure 1-2 , a bolt end treatment process for improving the pull-out resistance of the bolt, comprising the following steps:

[0071] S01, parameter design: According to the design requirements of the tension and compression parameters of the anchor rod and the geological parameters of the surrounding rock where the anchor rod is installed, the installation position of the anchor rod is determined in the surrounding rock area where the anchor rod is installed. After the installation position of the anchor rod is determined, the anchor rod installation position is marked, and an anchor hole is opened according to the mark. The radius of the anchor hole is limited to R1, and the depth of the anchor hole is limited to L1;

[0072] In step S01, the marking includes the height, angle, diameter and depth information of the anchor hole;

[0073] S02, cutting. After step S01, an anchor rod with specified specifications is selected. The radius of the anchor rod is limited to R2, and the length of the anchor rod is limited to L2. R2 is 0.55 times the radius of R1, and L2 is 0.9 times L1.

[0074] After the anchor specifications are determined, a designated length L3 is cut from the middle of the anchor end, and L3 is 1.1 times of R1;

[0075] In step S02, the anchor rod is a threaded steel anchor rod;

[0076] After the anchor rod end is cut from the middle position, the end of the anchor rod is divided into two parts;

[0077] S03, welding, select the short steel bar to be installed, the radius of the short steel bar is limited to R3, R3 is 0.5 times of R2, the length of the short steel bar is limited to L4, L4 is 2.05 times of R1, after the radius and length of the short steel bar are limited, use the ejection tool to push the two parts of the anchor rod end into a "V" shape, and weld the short steel bar between the two parts of the anchor rod end;

[0078] Through the above-mentioned cutting process setting, the pull-out resistance of the anchor rod can be increased by increasing the volume and rigidity of the anchoring end of the anchor rod;

[0079] At the same time, by performing secondary processing on the anchor rod itself, the pull-out resistance of the anchor rod is greatly improved without increasing the material cost, solving the problem of insufficient pull-out force of the anchor rod in the past;

[0080] In step S03, the two parts separated from the anchor rod end each have an outermost end point. After the short steel bar is welded, the distance between the two outermost end points should be limited to D, which is 2.2 times of R1.

[0081] S04, wear-resistant treatment, after step S03, the two separated parts of the anchor rod end, the short steel bar and the welding position are quenched, and after the quenching treatment is completed, a Ni-TiN coating is deposited on the above parts by using a pulse electrodeposition method to improve the wear resistance and hardness of the above parts;

[0082] Through wear-resistant treatment, the structural strength and service life of the anchor end can be effectively improved;

[0083] S05, initial spraying of concrete, with the anchor hole as the center, is performed on the outer surface of the surrounding rock where the anchor rod is installed. After the concrete in the initial spraying of concrete is semi-solidified, a steel mesh is implanted in the semi-solidified concrete, and the concrete of the initial spraying of concrete is fully solidified;

[0084] S06, pouring once, cleaning the anchor hole opened in step S01, after which a casting casing is placed on the inner wall of the anchor hole, the outer diameter of the casting casing is set to R4, which is 0.95 times of R1;

[0085] Before the first pouring, an external auxiliary positioning mechanism is used to set the pouring casing and the anchor hole at the same time. After the positioning is completed, a pouring is performed between the pouring casing and the anchor hole.

[0086] The casting casing is a hollow tubular structure with openings at both ends;

[0087] In step S06, during the first pouring, the concrete used during the first pouring is expansive concrete;

[0088] S07, screwing in. When the concrete poured once is half solidified, the casting casing is removed from the anchor hole. After the casting casing is removed, the anchor rod processed in step S04 is screwed into the anchor hole by using an anchor drill. When the anchor rod is screwed in, the screwing speed is set to 0.5 cm / min.

[0089] By setting the screw-in processing flow of the anchor rod, on the one hand, the connection strength between the anchor rod end and the anchor hole can be effectively improved, and on the other hand, a thread groove can be opened on the inner wall of the semi-solidified concrete, and the tensile strength of the anchor rod can be effectively improved by opening the thread groove;

[0090] At the same time, by opening the thread groove, the connection area between the semi-solidified concrete and the secondary pouring can be effectively increased;

[0091] S08, primary angle expansion, using a knocking mechanical arm to knock the anchor rod screwed into the anchor hole back and forth for a specified time toward the inside of the anchor hole, and causing the short steel bar to encounter resistance to increase the angle between the two parts of the anchor rod end;

[0092] In step S08, the specified time for one reciprocating tapping is 15 minutes;

[0093] Through the one-time angle expansion, on the one hand, the anchor rod can be further inserted into the anchor hole and the volume of the anchor rod end can be fully increased; on the other hand, the connection strength and friction strength between the two separated parts of the anchor rod end and the anchor hole can be effectively improved, thereby effectively increasing the pull-out resistance of the anchor rod end;

[0094] S09, secondary pouring, performing secondary segmented pouring of slurry into the anchor hole;

[0095] In step S09, the pouring is divided into a first pouring section and a second dosing section. When the first pouring section is poured, a resin anchoring agent is used to form a resin anchoring section. After the resin anchoring agent is filled, the resin anchoring section poured into the anchor hole is stirred. After stirring, a secondary dosing is performed on the resin anchoring section. During the secondary dosing, a mixture of an expansive cement roll and a fast-hardening cement slurry is used to finally form a drug mud anchoring section. When the drug mud anchoring section is formed, fine stones are filled into the mud. After the fine stones are filled, a vibrating rod is inserted into the mud and vibrated for 3 minutes, and the vibrating rod is removed. The addition of fine stones can improve the stability of the anchor rod in the anchor hole, and fully improve the stress of the anchor rod and the friction between the anchor rod and the anchor hole, thereby improving the pull-out resistance of the anchor rod in multiple ways;

[0096] In step S09, the particle size of the fine stone is 4 cm, and the filling amount of the fine stone is 55% of the filling amount of the mixture of the expansion cement roll and the rapid hardening cement slurry in step S09;

[0097] In step S09, the length of the resin anchoring section is 0.7 times the length of the anchor rod, and the length of the medicinal mud anchoring section is 0.5 times the length of the anchor rod;

[0098] S10, secondary angle expansion: after step S08, the anchor rod is reciprocatedly struck for a second time by a striking mechanical arm to further increase the angle between the two parts of the anchor rod end, and the mud surface is smoothed after the striking mechanical arm strikes for a specified time;

[0099] The specified time for the second reciprocating tapping in step S10 is 6 minutes;

[0100] Through the secondary expansion angle, on the one hand, the anchor rod can be further inserted into the anchor hole, and on the other hand, the connection strength and friction strength between the two separated parts of the anchor rod end and the anchor hole can be effectively improved, thereby effectively increasing the pull-out resistance of the anchor rod end;

[0101] S11, implantation, when the slurry filled in step S09 is fully solidified, a pad is implanted on the outer surface of the steel mesh, and the end of the anchor rod passes through the pad. After the anchor rod passes through, a nut is used to connect the anchor rod, the pad and the steel mesh into one;

[0102] S12, spray concrete again, spray concrete again on the top of the pad, wait for the sprayed concrete to solidify, and then complete the processing and installation and fixation of the anchor head.

[0103] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for treating the end of an anchor rod to improve its pull-out resistance, characterized in that: The following steps are involved: S01, parameter design: According to the design requirements of the tension and compression parameters of the anchor rod and the geological parameters of the surrounding rock where the anchor rod is installed, the installation position of the anchor rod is determined in the surrounding rock area where the anchor rod is installed. After the installation position of the anchor rod is determined, the anchor rod installation position is marked, and an anchor hole is opened according to the mark. The radius of the anchor hole is limited to R1, and the depth of the anchor hole is limited to L1; S02, cutting. After step S01, an anchor rod with specified specifications is selected. The radius of the anchor rod is limited to R2, and the length of the anchor rod is limited to L2. R2 is 0.45 times to 0.55 times the radius of R1, and L2 is 0.8 times to 0.9 times of L1. After the specifications of the anchor rod are specified, a specified length L3 is cut from the middle position of the anchor rod end. L3 is 0.5 times to 1.1 times R1. After the anchor rod end is cut from the middle position, the end of the anchor rod is divided into two parts; S03, welding, select the short steel bar to be installed, the radius of the short steel bar is limited to R3, R3 is 0.4 times to 0.5 times of R2, the length of the short steel bar is limited to L4, L4 is 2.01 times to 2.05 times of R1, after the radius and length of the short steel bar are determined, use the ejection tool to push the two parts of the anchor rod end into a "V" shape, and weld the short steel bar between the two parts of the anchor rod end; S04, wear-resistant treatment. After step S03, the two separated parts of the anchor rod end, the short steel bars and the welding position are quenched. After the quenching is completed, a Ni-TiN coating is deposited on the above parts using a pulse electrodeposition method to improve the wear resistance and hardness of the above parts.

2. The anchor rod end treatment process for improving the pull-out resistance of the anchor rod according to claim 1, characterized in that: The following steps are also included: S05, initial spraying of concrete, with the anchor hole as the center, is performed on the outer surface of the surrounding rock where the anchor rod is installed. After the concrete in the initial spraying of concrete is semi-solidified, a steel mesh is implanted in the semi-solidified concrete, and the concrete of the initial spraying of concrete is fully solidified; S06, one-time pouring, cleaning the anchor hole opened in step S01, after the cleaning is completed, placing a pouring casing on the inner wall of the anchor hole, the outer diameter of the pouring casing is set to R4, R4 is 0.85 times to 0.95 times of R1, before the one-time pouring, an external auxiliary positioning mechanism is used to set the pouring casing and the anchor hole at the same time, after the positioning is completed, one-time pouring is performed between the pouring casing and the anchor hole; S07, screwing in. When the concrete poured once is half solidified, the casting casing is removed from the anchor hole. After the casting casing is removed, the anchor rod processed in step S04 is screwed into the anchor hole by using an anchor drill. When the anchor rod is screwed in, the screwing speed is set to 0.5 cm / min. S08, primary angle expansion, using a knocking mechanical arm to knock the anchor rod screwed into the anchor hole back and forth for a specified time toward the inside of the anchor hole, and causing the short steel bar to encounter resistance to increase the angle between the two parts of the anchor rod end; S09, secondary pouring, performing secondary segmented pouring of slurry into the anchor hole; S10, secondary angle expansion: after step S08, the anchor rod is reciprocatedly struck for a second time by a striking mechanical arm to further increase the angle between the two parts of the anchor rod end, and the mud surface is smoothed after the striking mechanical arm strikes for a specified time; S11, implantation, when the slurry filled in step S09 is fully solidified, a pad is implanted on the outer surface of the steel mesh, and the end of the anchor rod passes through the pad. After the anchor rod passes through, a nut is used to connect the anchor rod, the pad and the steel mesh into one; S12, spraying concrete again, spraying concrete again on the pad, and after the sprayed concrete solidifies, completing the processing and installation and fixing of the anchor head; In the step S01, the marking includes the height, angle, diameter and depth information of the anchor hole.

3. The anchor rod end treatment process for improving the pull-out resistance of the anchor rod according to claim 1, characterized in that: In the step S03, the two separated parts of the anchor rod end each have an outermost endpoint. After the short steel bar is welded, the distance between the two outermost endpoints should be limited to D, and D is 2.05 times to 2.2 times of R1.

4. A process for treating the end of an anchor rod to improve the pull-out resistance of the anchor rod according to any one of claims 1 to 3, characterized in that: In the step S06, during the primary pouring, the concrete used during the primary pouring is expansive concrete.

5. A process for treating the end of an anchor rod to improve its pull-out resistance according to any one of claims 1 to 3, characterized in that: In the step S08, the specified time for one reciprocating knocking is 5 minutes to 15 minutes, and the specified time for two reciprocating knockings in the step S10 is 2 minutes to 6 minutes.

6. A process for treating the end of an anchor rod to improve its pull-out resistance according to any one of claims 1 to 3, characterized in that: In the step S09, the pouring includes a first pouring section, a resin anchoring agent is used, and a resin anchoring section is formed. After the resin anchoring agent is filled, the resin anchoring section poured into the anchor hole is stirred, and after stirring, a second dosing is performed on the resin anchoring section.

7. The anchor rod end treatment process for improving the pull-out resistance of the anchor rod according to claim 6, characterized in that: During the secondary dosing, a mixture of expansive cement rolls and quick-hardening cement slurry is used to eventually form a medicinal mud anchoring section. When the medicinal mud anchoring section is formed, fine stones are filled into the mud. After the fine stones are filled, a vibrating rod is inserted into the mud and vibrated for 2min-3min. The vibrating rod is removed. The addition of fine stones can improve the stability of the anchor rod in the anchor hole, and fully increase the stress of the anchor rod and the friction between the anchor rod and the anchor hole, thereby improving the pull-out resistance of the anchor rod in multiple ways.

8. The anchor rod end treatment process for improving the pull-out resistance of the anchor rod according to claim 7, characterized in that: In the step S09, the particle size of the fine stone is 0.4 cm-4 cm, and the filling amount of the fine stone is 30%-55% of the filling amount of the mixture of the expansion cement roll and the rapid hardening cement slurry in the step S09.

9. The anchor rod end treatment process for improving the pull-out resistance of the anchor rod according to claim 8, characterized in that: In the step S09, the length of the resin anchoring section is 0.5 to 0.7 times the length of the anchor rod, and the length of the medicinal mud anchoring section is 0.3 to 0.5 times the length of the anchor rod.

10. A process for treating the end of an anchor rod to improve its pull-out resistance according to any one of claims 1 to 3, characterized in that: In the step S02, the anchor rod adopts a longitudinal rib-free threaded steel anchor rod or an equal-strength threaded steel anchor rod.

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