CN113464184A - Integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation - Google Patents
Integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation Download PDFInfo
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- CN113464184A CN113464184A CN202110649196.7A CN202110649196A CN113464184A CN 113464184 A CN113464184 A CN 113464184A CN 202110649196 A CN202110649196 A CN 202110649196A CN 113464184 A CN113464184 A CN 113464184A
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- 238000004873 anchoring Methods 0.000 title claims abstract description 145
- 230000009466 transformation Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 15
- 238000005728 strengthening Methods 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 241001391944 Commicarpus scandens Species 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 9
- 230000003014 reinforcing effect Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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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
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides an integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation, wherein a flat hexagonal locking device is arranged at the tail part of an anchor rod, so that the problem that the effective space of a roadway is reduced due to the exposed length of a drill hole of an anchor rod support is avoided, the problem of local stress concentration of a rod body is effectively avoided, and the rod body is not easy to break. The rod body is meshed with a fine thread with a certain length in the pre-anchor loading device to generate a pre-tightening force, the meshing length is long, the thread interval is small, and the applied pre-tightening force is larger under the same torque condition and is not easy to reduce along with the increase of time; the integral anchor rod device generates pretightening force at the bottom of a drill hole and at the end part of the anchor rod, the pretightening force is consistent with the generation position of the anchoring force, and in the pretightening force generation process, the pre-anchoring loading device gradually opens through mechanical force and is in close contact with the wall of the drill hole to generate mechanical anchoring force, so that the effective cooperative conversion of the chemical anchoring force, the mechanical anchoring force and the pretightening force is realized, and the anchoring force of the anchor rod is greatly improved.
Description
Technical Field
The invention relates to the technical field of roadway support design in mining engineering, in particular to an integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation.
Background
In the field of coal mine engineering, the anchor rod is an active support device which has the advantages of widest application, most use amount, obvious effect, safety and high efficiency in coal mine roadway support. The anchor bolt support comprises a rod body, a tray, a nut, an anchoring agent and the like, and the working principle is as follows: at the bottom of the drilling hole, the rod body and the deep stable surrounding rock are tightly anchored together by an anchoring agent to generate anchoring force; and applying a certain torque to the tail part of the rod body through a drilling machine or a torque wrench outside the drilled hole to enable the tray to be tightly pressed on the surface of the roadway, so that pre-tightening force is provided for the anchor rod, and the pre-tightening force is diffused into surrounding rocks. The deep anchoring force and the external pretightening force are matched with each other, so that the anchor rod body is in a stretching state, the stress state of surrounding rock is changed, the active and timely supporting effect of the anchor rod is realized, and the schematic diagram of the conventional anchor rod supporting principle is shown in fig. 1.
The anchoring force and the pretightening force are two key factors for the function of anchor bolt support, and the two have important mechanical relation. The effective performance of the anchor bolt supporting function depends on the mechanical relation between the anchoring force and the pretightening force: after the anchoring is finished, the anchoring force is always existed, and if the pretightening force is not applied, the anchoring force cannot be displayed; if the pre-tightening force is not sufficiently applied, the anchoring force cannot be fully shown and cannot reach the detection standard of an enterprise, namely the pre-tightening force is the premise of showing the anchoring force.
The current stock is of a lot of kind, but has neglected the mechanics of pretightning force, anchorage force in its design process and has lacked effective guide to the cooperative transformation promotion of pretightning force and anchorage force, and concrete analysis is as follows:
(1) in the aspect of the pretightning force is applyed, need apply certain moment of torsion to the nut of the shank afterbody through the rig, so that the tray compresses tightly the tunnel surface and produces the pretightning force, therefore, for producing effectual pretightning force, the afterbody of the stock body of rod all designs the screw thread of certain length and exposes drilling 100 ~ 150mm now, the stock afterbody exposes greatly reduced tunnel section pedestrian, the availability factor in the aspect of the transportation, simultaneously according to stock work characteristics, stock body of rod afterbody atress is the most complicated, and thread design has reduced stock body of rod afterbody intensity, nut and screw thread area of contact are little, easily take place stress concentration and break.
(2) In the aspect of generating positions of pretightening force and anchoring force, the anchoring force is generated at the bottom of a hole of the drilling hole and the end part of the anchor rod, the pretightening force is generated at the hole opening of the drilling hole and the tail part of the anchor rod, and the pretightening force and the anchoring force are far from generating positions and are not beneficial to interaction or conversion between the pretightening force and the anchoring force.
(3) In the aspect of the generation principle of the pretightening force and the anchoring force, the magnitude of the anchoring force depends on the contact area of the anchoring agent with the anchor rod and surrounding rocks, the performance of the anchoring agent and other factors, and the magnitude of the pretightening force is closely related to the pretightening torque of the nut, the thread specification, the friction coefficient and other factors; in the past, the design of an anchor rod mostly takes the pretightening force and the anchoring force as two independent systems to be designed, the mechanical relation between the pretightening force and the anchoring force is not deeply considered, and the design concept of synchronous loading and cooperative transformation of the pretightening force and the anchoring force is not provided.
In recent years, various anchor rod structures are researched and designed at home and abroad, for example, a Chinese patent of patent No. 201910405852.1 discloses an anti-drop anchor rod with large deformation and an anchoring method, wherein a pull rod mechanism in a hollow anchor rod props up a bottom expansion anchor rod head to realize the combined action of mechanical anchoring and chemical anchoring; chinese patent No. 200310108547.5 discloses a shell-expanding anchor rod, wherein one end of a hollow anchor rod body is connected with a shell-expanding inner wedge in a shell-expanding anchoring head, a shell-expanding clamping piece is assembled by a binding rope, the anchoring head and the anchor rod body are inserted into the bottom by a rotary impact means, and the shell-expanding clamping piece is expanded outwards after the shell-expanding anchoring head is pressed tightly; application number is 202010226854.7's chinese patent, discloses an inflation formula stock, increases the shell that sets up a plurality of round platform pieces, anchor piece and extrusion piece in the stock outside, and through rotatory stock, the round platform piece passes through the extrusion piece in the motion process and extrudees the laminating country rock with anchor piece inflation, reaches the purpose that prevents the stock and drop. However, the above patents are all in the form of external pre-tightening of the tail part and the orifice of the anchor rod, and the design concept of synchronous loading and cooperative transformation of pre-tightening force and anchoring force is not involved. This patent will provide an integral stock device of built-in pretension and anchor cooperative transformation in advance, and it changes the spatial position that the pretightning force was applyed through stock structure overall design, realizes exerting the cooperative transformation of pretightning force, pretightning force and anchoring force at the drilling bottom, strengthens the organic mechanics relation between the two, improves the overall support ability of stock support system.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation, which changes the time and the spatial position of the pre-tightening force application through the integral design of an anchor rod structure, realizes the cooperative transformation of the pre-tightening force and the anchoring force and enhances the organic mechanical relation between the pre-tightening force and the anchoring force.
The technical scheme adopted by the invention is as follows: an integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation comprises an anchor rod, wherein one end of the anchor rod is connected with a hexagonal locking device, and the other end of the anchor rod is in threaded connection with a pre-anchoring loading device; the pre-anchor loading device comprises an anchor strengthening section, a conventional anchor section, a middle pre-tightening section, a reducing transition section and a tail expanding and pressurizing section which are connected in sequence, wherein the anchor strengthening section is positioned at the bottommost end of the pre-anchor loading device, the diameter of the anchor strengthening section is increased relative to the diameter of the conventional anchor section, and the anchor strengthening section can be firmly bonded with the bottom of a drill hole; chemical anchoring agents are stored in the anchoring reinforcing section, the anchoring reinforcing section and the conventional anchoring section, and round small holes are reserved on the pipe wall, so that the anchoring agents can smoothly flow out; the inner wall of the middle pre-tightening section and the outer wall of the anchor rod are correspondingly provided with fine thread structures which are in threaded connection to apply pre-tightening force to the anchor rod; the diameter of the diameter-variable transition section is the same as that of the middle pre-tightening section, so that a buffering effect is achieved, the change of the size of the middle pre-tightening section in the pressurizing process of the tail diameter-expanding pressurizing section is avoided, and the pre-tightening effect is ensured; the tail expanding and pressurizing section is in a round table shape, the tail opening groove of the pipe wall of the section is divided into a plurality of pieces, the opening angle is gradually enlarged to the end part, the middle part of the anchor rod corresponding to the tail expanding and pressurizing section is provided with an anchoring force amplifier, and the anchoring force amplifier radially extrudes the tail expanding and pressurizing section; when the anchor rod and the pre-anchoring loading device are arranged in a drill hole, the anchoring force amplifier and the tail expanding pressurizing section are expanded and extruded to generate mechanical anchoring force, the tail expanding pressurizing section is tightly attached to the wall of the drill hole, the anchor rod is in threaded connection with the pre-anchoring loading device to generate pretightening force, and the pre-anchoring loading device, the anchor rod and the roadway surrounding rock are anchored together by the anchoring strengthening section and the conventional anchoring section under the action of chemical cartridges.
Furthermore, the anchor rod and the pre-anchor loading device are respectively provided with fine threads correspondingly, the thread pitch of the fine threads is 2-4mm, the friction coefficient in the pre-tightening force application process can be reduced, and the conversion coefficient of the pre-tightening force moment and the pre-tightening force is increased.
Further, the clearance between the anchoring strengthening section and the hole wall of the drill hole is 1 mm.
Furthermore, the number of the small holes is not less than three along the circumferential direction of the anchoring reinforcing section and the conventional anchoring section, a plurality of groups of small holes are uniformly distributed along the axial direction of the anchoring reinforcing section and the conventional anchoring section, and the diameter of each small hole is 1-2 cm.
Furthermore, a blocking plate is arranged at the joint position of the end head anchoring section and the middle pre-tightening section, the blocking plate has a structure with certain strength and good brittleness, the anchor rod can be damaged by rotation, and the material of the blocking plate is metal, plastic or wood.
Furthermore, the diameters of the anchoring strengthening section, the conventional anchoring section, the middle pre-tightening section and the diameter-changing transition section are smaller than the diameter of the drilled hole by 3 mm.
Further, the anchoring force amplifier and the anchor rod are of an integrated structure, and the thickness of the anchoring force amplifier is 2-3 cm.
Furthermore, when the anchor rod is anchored with the drill hole, the hexagonal locking device tightly presses the steel belt on the surrounding rock outside the drill hole, and the pretightening force is diffused through the steel belt
Furthermore, the thickness of the hexagonal locking device is 2cm, and the diameter of the hexagonal locking device is 2 times of the diameter of the rod body.
Further, the diameter of the anchor rod is smaller than the inner diameter of the main body part of the pre-anchor loading device by 2 mm.
Has the advantages that:
(1) this integral anchor rod device has avoided the anchor bolt support drilling to expose the problem that length caused the effective space in tunnel to reduce completely through setting up flat hexagon locking device at the stock afterbody, has greatly improved tunnel space utilization, has cancelled stock afterbody screw thread design simultaneously, improves body of rod afterbody intensity, can effectively avoid the body of rod local stress concentration problem, and difficult emergence is broken.
(2) The production of traditional stock pretightning force relies on nut and stock afterbody screw thread interlock each other, and not only interlock distance is short and screw thread pitch is big. The pre-tightening force is generated by meshing a rod body with fine threads with a certain length in the pre-anchor loading device, the meshing length is long, the thread interval is small, under the same torque condition, the pre-tightening force applied by the pre-tightening device is larger, and is not easy to reduce along with the increase of time, so that the pre-tightening force applying method is more effective.
(3) Different from the mode of generating pretightening force outside the hole and at the tail part of the anchor rod in the prior art, the integral anchor rod device generates pretightening force at the bottom of the drill hole and at the end part of the anchor rod, namely the pretightening force is consistent with the generation position of anchoring force, and in the process of generating the pretightening force, the pre-anchoring loading device is gradually opened through mechanical force and is tightly contacted with the wall of the hole of the drill hole to generate mechanical anchoring force, so that the synchronous loading of the pretightening force and the mechanical anchoring force and the conversion of the pretightening force to the mechanical anchoring force are realized.
(4) The anchor rod device in the design of the invention realizes the conversion of the pre-tightening force to the mechanical anchoring force and simultaneously realizes the reinforcement of the mechanical anchoring force to the chemical anchoring force, namely, the effective cooperative conversion of the chemical anchoring force, the mechanical anchoring force and the pre-tightening force is simultaneously realized, thereby greatly improving the anchoring force of the anchor rod.
Drawings
Figure 1 is a schematic view of a conventional bolting principle;
FIG. 2 is a schematic view of an integral anchor rod with built-in pre-tightening and pre-anchoring cooperative transformation;
FIG. 3 is a schematic view of a pre-anchor loading device;
FIG. 4 is a sectional view of the tail expanding pressurizing section A-A;
FIG. 5 is a diagram of an integrated anchor bolt support state with built-in pretension and pretension anchoring cooperative transformation;
in the figure, 1-hexagonal locking means; 2-anchor rod body; 3-an anchoring force amplifier; 4-external fine thread structure; 5-internal fine thread structure; 6-a barrier plate; 7-anchoring agent outflow holes; 8-tail expanding pressurization section; 9-a variable diameter transition section; 10-a middle pre-tightening section; 11-a conventional anchor segment; 12-an anchor reinforcement section; 13-slotting the tail part; 14-expanding sheet.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings:
as shown in fig. 2, the integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation comprises a hexagonal locking device 1, an anchor rod body 2, an anchoring force amplifier 3, an outer fine thread structure 4, an inner fine thread structure 5, a blocking plate 6 and an anchoring agent outflow hole 7. The pre-anchoring loading device (as shown in fig. 3) comprises an anchoring strengthening section 12, a conventional anchoring section 11, a middle pre-tightening section 10, a reducing transition section 9 and a tail expanding pressurization section 8. The total length d of the conventional anchoring section 11 and the anchoring reinforcing section 12 is 30-45 cm, the length e of the anchoring reinforcing section 12 is 2-3 cm, the diameters of the conventional anchoring section 11, the middle pre-tightening section 10 and the diameter-changing transition section 9 are equal to each other and are smaller than the diameter of a drilled hole by 3mm, and it is required to be noted that the diameter of the anchoring reinforcing section 12 is large and only has a 1mm installation gap with the hole wall, so that after an anchoring agent is released, the anchoring reinforcing section 12 and surrounding rocks are quickly anchored together, and a pre-anchoring loading device is fixed at the bottom of the hole. The anchoring strengthening section 12 and the conventional anchoring section 11 are hollow inside and used for storing anchoring agent, and are provided with a plurality of groups of anchoring agent outflow holes, the diameters of the outflow holes are 1-2cm, and the outflow holes are used for anchoring an anchor rod, a pre-anchoring loading device and surrounding rocks; the joint position of the conventional anchoring section 11 and the middle pre-tightening section 10 is provided with a barrier plate 6 which has certain strength but better brittleness, the anchor rod can be damaged by rotating, and the material can be metal, plastic or wood; the length c of the middle pre-tightening section 10 is 10-15 cm, the inner surface of the middle pre-tightening section 10 is of a fine thread structure, the thread pitch of the thread is 2-4mm, the friction coefficient in the pre-tightening force application process can be reduced, and the conversion coefficient of the pre-tightening force moment and the pre-tightening force is increased; the diameter-variable transition section 9 is arranged in the middle pre-tightening section 10 and the tail diameter-expanding pressurizing section 8, and the length b of the diameter-variable transition section is 10-15 cm, so that the size of the middle pre-tightening section 10 is prevented from being changed in the upward movement process of the anchoring force amplifier 3, and the pre-tightening effect is prevented from being influenced; the tail expanding and pressurizing section 8 is in a circular truncated cone shape, 3 tail grooves 14 are formed in the cylinder wall, the tail expanding and pressurizing section is divided into 3 expanding pieces 15, the diameter of the tail expanding and pressurizing section is gradually increased from top to bottom, the diameter of the tail expanding and pressurizing section is smaller than the diameter of a drilled hole by 1mm, and the length a is 10-15 cm. The length relation of the pre-anchor loading device meets the conditions that a is b and c, and a + b + c is d; an outer fine thread structure is arranged on the outer surface of the rod body at a position which is a dcm away from the head end of the anchor rod, the length of the outer fine thread structure is ccm, the thread pitch of the outer fine thread structure is 2-4mm, and the size of the outer fine thread structure corresponds to that of the inner fine thread structure in the middle pre-tightening section 10; the anchoring force amplifier 3 is located at a position (b + c + d) cm away from the first section of the anchor rod, the anchoring force amplifier and the anchor rod are of an integral structure, the thickness g is 2-3 cm, and the diameter of the anchor rod is smaller than 2mm of the pre-anchoring loading device. The tail part of the anchor rod body is a hexagonal locking device with the length f of 2cm and the diameter of 2 times of the rod body diameter, and the aim is to diffuse pretightening force through a steel belt. It should be noted that in the integral anchor rod device with the built-in pre-tightening and pre-tightening anchoring cooperative transformation, the lengths of the external fine thread structure 4, the internal fine thread structure 5, the tail expanding pressurization section 8, the reducing transition section 9, the middle pre-tightening section 10, the anchoring reinforcement section 12 and the conventional anchoring section 11 are adjusted according to different geological conditions.
In the engineering practice process, holes are drilled from the surface of the surrounding rock of the roadway to the deep part of the surrounding rock, and the coal rock powder in the drilled holes is cleaned. Slowly placing an integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation into a drill hole, firstly, slowly pushing an anchor rod body 2 to rotate into a certain distance through an external drilling machine, and enabling an anchoring agent to flow out of an anchoring agent outflow hole 7, so that the pre-tightening loading device is tightly anchored with stable surrounding rock; secondly, continuing to slowly rotate the anchor rod body 2, so that the external fine-tooth thread structure 4 of the anchor rod body is meshed with the internal fine-tooth thread structure 5 of the pre-anchoring loading device, and the anchoring force amplifier 3 expands the tail expanding and pressurizing section 8; and finally, the drilling machine rotates to push the anchor rod body 2 until the tail hexagonal locking device 1 extrudes the steel strip to be slightly deformed, and an integral anchor rod support state diagram with built-in pre-tightening and pre-tightening anchoring cooperative transformation is shown in fig. 5.
Claims (10)
1. An integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation comprises an anchor rod, wherein one end of the anchor rod is connected with a hexagonal locking device, and the other end of the anchor rod is in threaded connection with a pre-anchoring loading device; chemical anchoring agents are stored in the anchoring strengthening section and the end anchoring section, and round small holes are reserved in the pipe wall, so that the anchoring agents can smoothly flow out; the inner wall of the middle pre-tightening section and the outer wall of the anchor rod are correspondingly provided with fine thread structures which are in threaded connection to apply pre-tightening force to the anchor rod; the diameter of the diameter-variable transition section is the same as that of the middle pre-tightening section, so that a buffering effect is achieved, the change of the size of the middle pre-tightening section in the pressurizing process of the tail diameter-expanding pressurizing section is avoided, and the pre-tightening effect is ensured; the tail expanding and pressurizing section is in a round table shape, the tail opening groove of the pipe wall of the section is divided into a plurality of pieces, the opening angle is gradually enlarged to the end part, the middle part of the anchor rod corresponding to the tail expanding and pressurizing section is provided with an anchoring force amplifier, and the anchoring force amplifier radially extrudes the tail expanding and pressurizing section; when the anchor rod and the pre-anchoring loading device are arranged in a drill hole, the anchoring force amplifier and the tail expanding pressurizing section are expanded and extruded to generate mechanical anchoring force, the tail expanding pressurizing section is tightly attached to the wall of the drill hole, the anchor rod is in threaded connection with the pre-anchoring loading device to generate pretightening force, and the end anchoring section anchors the pre-anchoring loading device, the anchor rod and the surrounding rock of the roadway together through the effect of chemical cartridges.
2. The integral anchor rod device with the built-in pre-tightening and pre-tightening anchoring cooperative conversion function as claimed in claim 1, wherein the anchor rod and the pre-tightening anchoring loading device are respectively and correspondingly provided with fine threads, the thread pitch of the fine threads is 2-4mm, friction coefficient in the pre-tightening force application process can be reduced, and conversion coefficient of pre-tightening force moment and pre-tightening force is increased.
3. The integral anchor rod device with the built-in pre-tightening and pre-tightening anchor cooperative transformation function as claimed in claim 1, wherein a gap between the anchor strengthening section and the wall of the borehole is 1 mm.
4. The integral anchor rod device with the built-in pre-tightening and pre-tightening anchoring cooperative transformation as claimed in claim 1, wherein the number of the small holes is not less than three along the circumferential direction of the end anchoring section, and the small holes are uniformly distributed along the axial direction of the end anchoring section, and the diameter of each small hole is 1-2 cm.
5. The integrated anchor rod device with the built-in pre-tightening and pre-tightening anchoring cooperative transformation as claimed in claim 1, wherein a blocking plate is arranged at the joint of the end head anchoring section and the middle pre-tightening section, and the blocking plate has a structure with certain strength and good brittleness.
6. The integral anchor rod device with the built-in pre-tightening and pre-tightening anchoring cooperative transformation as claimed in claim 1, wherein the diameters of the end anchoring section, the middle pre-tightening section and the reducing transition section are smaller than the diameter of a drilled hole by 3 mm.
7. The integral anchor rod device with the built-in pre-tightening and pre-tightening anchoring cooperative transformation function as claimed in claim 1, wherein the anchoring force amplifier and the anchor rod are of an integral structure, and the thickness of the anchoring force amplifier is 2-3 cm.
8. The integral anchor rod device with built-in pretension and pretension anchor cooperative transformation as claimed in claim 1, wherein when the anchor rod is anchored with the borehole, the hexagonal locking device tightly presses the steel belt on the surrounding rock outside the borehole, and the pretension force is diffused by the steel belt
9. The integral anchor rod device with the built-in pretension and the pretension anchor co-transformation as claimed in claim 1, wherein the hexagonal locking device has a thickness of 2cm and a diameter of 2 times of the diameter of the rod body.
10. The integral anchor rod device with the built-in pre-tightening and pre-tightening anchoring cooperative transformation function as claimed in claim 1, wherein the diameter of the anchor rod is 2mm smaller than the inner diameter of the main body part of the pre-tightening loading device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110649196.7A CN113464184A (en) | 2021-06-10 | 2021-06-10 | Integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110649196.7A CN113464184A (en) | 2021-06-10 | 2021-06-10 | Integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation |
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| Publication Number | Publication Date |
|---|---|
| CN113464184A true CN113464184A (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110649196.7A Withdrawn CN113464184A (en) | 2021-06-10 | 2021-06-10 | Integral anchor rod device with built-in pre-tightening and pre-tightening anchoring cooperative transformation |
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| CN (1) | CN113464184A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114683422A (en) * | 2022-04-18 | 2022-07-01 | 厦门品河精密科技有限公司 | Main guide wheel with reduced deformation |
-
2021
- 2021-06-10 CN CN202110649196.7A patent/CN113464184A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114683422A (en) * | 2022-04-18 | 2022-07-01 | 厦门品河精密科技有限公司 | Main guide wheel with reduced deformation |
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Application publication date: 20211001 |