CN214063015U - Friction constant-resistance grading yielding anchor rod - Google Patents
Friction constant-resistance grading yielding anchor rod Download PDFInfo
- Publication number
- CN214063015U CN214063015U CN202023016691.4U CN202023016691U CN214063015U CN 214063015 U CN214063015 U CN 214063015U CN 202023016691 U CN202023016691 U CN 202023016691U CN 214063015 U CN214063015 U CN 214063015U
- Authority
- CN
- China
- Prior art keywords
- fastening nut
- stock
- anchor rod
- anchor
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The utility model relates to a friction constant resistance lets in grades presses stock. For overcoming prior art defect, this friction constant resistance lets in grades presses stock includes arch supporter, fastening nut, stock body, screw rod and rotatory section of thick bamboo, screw rod one end is direct to link firmly with the outer end of rotatory section of thick bamboo is coaxial to integrated into one piece, stock body outer end is equipped with the external screw thread, rotatory section of thick bamboo is revolved the cover and is served at this external of stock, the two screw-thread fit, and the lead angle of its screw thread is 60-65, the fastening nut main part is frustum shape, and fastening nut tip external diameter < the through-hole diameter on the uplift < fastening nut main aspects external diameter, and the peripheral arch supporter of uplift presses on the peripheral country rock in adapted anchor hole, and its tip still outwards extends a cylinder section. The utility model discloses friction constant resistance lets in grades presses stock has processing, simple to operate's advantage, can provide invariable anchor power during the initial time, can improve anchor power in the certain limit automation gradually again when the load increases, extensively is applicable to various mines.
Description
Technical Field
The utility model relates to a friction constant resistance lets in grades presses stock.
Background
At present, in coal mines and metal mines for deep mining, because the buried depth of a roadway is large, the ground stress of the roadway is large, the roadway is supported by a common anchor rod and still generates a certain amount of uncontrollable deformation, and then surrounding rocks enter a gradually stable state; the requirement is that the anchor rod has the pressure yielding capacity in the early stage of roadway support, the roadway is deformed by a proper amount to release the elastic energy accumulated by surrounding rocks, and the requirement is that the anchor rod has the pressure yielding function.
The pressure device that lets of pressure stock of tradition often adopts and lets the clamping ring or let the pressure pipe, lets after the clamp ring starts, and the effective length of strutting of stock is than letting a small amount of extensions before the clamp ring starts to the deformation of adaptation tunnel country rock avoids the stock body of rod to be broken by the drawing, makes the stock can take place to warp at tunnel country rock and continue to exert the supporting effect. And let the pressure ring whether start, depend on the tensile stress that the stock received and let the intensity of clamping ring, when the tensile stress that the stock received is greater than the intensity of letting the clamping ring, let the pressure ring start and the compressive deformation.
However, after the yielding ring is started, the deformation of the surrounding rock is rapidly increased, which often causes that the yielding process of the anchor rod has a sudden property, the constant support resistance (the support force of the anchor rod is reduced) cannot be kept to limit the deformation of the surrounding rock to the maximum extent, and the limit yielding performance of the yielding anchor rod anchoring device cannot be fully exerted (the anchor rod support fails due to the overlarge deformation of the surrounding rock and the damage of the roadway).
The Chinese patent invention with the publication number of CN107218072B, issued on 12.03.2019, discloses an extrusion friction type constant-resistance yielding large-deformation anchor rod, which comprises a first anchor rod and a constant-resistance extrusion friction sleeve, wherein the extrusion friction type constant-resistance yielding large-deformation anchor rod comprises a first part and a second part which are smoothly connected and fixed through an arc structure, the first part and the second part are both hollow cylinders, the bottom of the closed end of the first part is fixedly connected with one end of the first anchor rod, and a disc-shaped tray is fixed at the position, close to the end head, of the other end of the first anchor rod through a first fastening nut; still include the second stock, its top is stretched into by the open end of second part, and the top of second stock passes through piston movable connection in the constant resistance extrusion friction sleeve, has seted up circular recess along piston circumferential surface, a plurality of steel balls of embedding in it, and a plurality of steel balls are with the top seamless surrounding of second stock. The anchor rod has good supporting function and high bearing capacity, but the structure is still complex, a piston needs to be welded on the anchor rod (namely the second anchor rod 2-1 in the patent), components such as steel balls and the like are assembled, the installation is complicated, the constant-resistance extrusion friction sleeve deforms under pressure when yielding, the deformation states are different, the force applied to the anchor rod is different, the real constant resistance is difficult to achieve, the deformation does not have elasticity, the reversibility is avoided, and the whole anchor rod fails under the conditions of fracture and steel ball leakage.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is how to overcome prior art's above-mentioned defect, provides a friction constant resistance lets in grades and presses stock.
For solving above-mentioned technical problem, this anchor rod is stepped to friction constant resistance includes arch supporter, fastening nut, anchor rod body and screw rod, the screw rod exposes outside the adapted anchor eye, the arch supporter is made by the steel sheet, and its central outside uplift forms the uplift portion, and the uplift portion center is opened there is the through-hole, and overlaps through this through-hole on the screw rod, fastening nut establishes soon on the screw rod, fastening nut and screw rod screw-thread fit, the screw thread of fastening nut and screw rod is self-locking thread, and fastening nut presses in the uplift portion, its characterized in that: it still includes a rotatory section of thick bamboo, screw rod one end is direct to link firmly with the outer end of a rotatory section of thick bamboo is coaxial to integrated into one piece, and stock body outer end is equipped with the external screw thread, a rotatory section of thick bamboo is revolved and is overlapped on this external end of stock, the two screw-thread fit, and the lead angle of its screw thread is 60-65, the fastening nut main part is frustum shape, and fastening nut tip external diameter < the through-hole diameter on the uplift < fastening nut main aspects external diameter, and the peripheral arch supporter of uplift presses on the peripheral country rock adapted of anchor eye, and its tip still outwards extends a cylinder section.
Preferably, the screw direction of the fastening nut and the screw is the same as the screw direction of the internal thread of the rotary cylinder (of course, the screw pitches are different)
The tension on the anchor rod is partially converted into the torque of the rotary cylinder. When the stress of the anchor rod reaches 60% of the ultimate strength but not more than 80%, the torque overcomes the static friction force between the internal thread of the rotary cylinder and the external thread at the outer end of the anchor rod body, the rotary cylinder rotates, the screw rod rotates along with the rotary cylinder, the fastening nut does not rotate under the constraint of the arch support body, and the cylindrical section at the small end of the fastening nut is firstly extruded into the through hole of the arch support body under the drive of the screw rod, as shown in fig. 3.
At this stage, the arch support body basically does not deform, the tension of the anchor rod is offset by the static friction force between the internal thread of the rotary cylinder and the external thread at the outer end of the anchor rod body, and the anchor rod is in a first-stage yielding state. The process utilizes the characteristic that the sliding friction force is kept unchanged, and the anchor rod is kept with constant supporting force by adjusting the constant friction angle between the anchor rod and the rotary cylinder.
When the stress of the anchor rod reaches 80% or more than 80% of the ultimate strength, the static friction force between the internal thread of the rotary cylinder and the external thread at the outer end of the anchor rod body is overcome by the torsion force exerted on the rotary cylinder, the rotary cylinder rotates, the screw rod rotates along with the rotary cylinder, the fastening nut does not rotate under the constraint of the arch support body, and the frustum shape of the fastening nut is gradually extruded into the through hole of the arch support body under the drive of the screw rod, as shown in fig. 4. At this stage, the arch support body is deformed under stress, the anchoring force is increased, and the arch support body can be regarded as a secondary yielding state. So design, at the beginning, this friction constant resistance lets in grades presses the stock and can provide invariable anchoring power, when the load increases, can also improve anchoring power in certain extent automation gradually, needn't manual regulation.
The friction constant-resistance grading yielding anchor rod is convenient to process and install, and a large number of steel balls are not arranged.
Preferably, the outer end of the matched anchor hole is expanded to form an expanded hole, and the rotary cylinder is arranged in the expanded hole. So design, the installation is convenient.
Preferably, the anchor rod body is further provided with a rubber damping pad, and the rubber damping pad is clamped between the rotating cylinder and surrounding rock at the inner end of the enlarged hole. By the design, certain elastic yielding can be provided.
Preferably, the inner surface and the outer surface of the bulge part are spherical. By the design, the elasticity is good, and the strength is high.
Preferably, the supporting device further comprises a supporting rigid ring, the supporting rigid ring is sleeved on the screw, the inner end face of the supporting rigid ring is pressed on the rotating cylinder, and the outer edge of the supporting rigid ring abuts against the edge of the inner wall of the bulge part. So design, support rigid ring and fastening nut and follow both sides compression arch supporter respectively, when the ore deposit shakes, can provide certain elastic deformation, the ore deposit shakes and eliminates, and the part resumes.
Preferably, the anchor rod further comprises a rotation stopping fixed wing, and the rotation stopping fixed wing is arranged between the anchor rod body and the inner wall of the adapted anchor hole. By the design, the rotation stopping fixed wing is clamped between the anchor rod body and the inner wall of the matched anchor hole, and the anchor rod can be effectively prevented from rotating when yielding.
The utility model discloses friction constant resistance lets in grades presses stock has processing, simple to operate's advantage, can provide invariable anchor power during the initial time, can improve anchor power in the certain limit automation gradually again when the load increases, extensively is applicable to various mines.
Drawings
The utility model discloses friction constant resistance step by step lets presses stock to make further explanation below with the accompanying drawing:
FIG. 1 is a schematic sectional view (cut along a plane passing through the axial line of the anchor rod) of a matched anchor hole and an enlarged hole of the friction constant-resistance graded yielding anchor rod;
FIG. 2 is a schematic sectional view (taken along a plane passing through the axial center line of the anchor rod) of the initial installation state of the friction constant-resistance graded yielding anchor rod;
fig. 3 is a schematic cross-sectional view (cut along a plane passing through the axial center line of the anchor rod) of the first-stage (constant-resistance) yielding state of the friction constant-resistance grading yielding anchor rod;
fig. 4 is a schematic sectional view (cut along a plane passing through the axial lead of the anchor) of the two-stage yielding state of the friction constant-resistance grading yielding anchor rod.
In the figure: the anchor rod comprises an arched support body 1, a fastening nut 2, an anchor rod body 3, a screw rod 4, a matched anchor hole 5, a rotating cylinder 6, a surrounding rock 7, a cylindrical section 8, an enlarged hole 51, a rubber damping pad 9, a supporting rigid ring 10, a bump 11, a through hole 12 and a stop-rotation fixing wing 13.
Detailed Description
The first implementation mode comprises the following steps: as shown in fig. 1-4, the friction constant resistance graded yielding anchor rod comprises an arch support body 1, a fastening nut 2, an anchor rod body 3 and a screw rod 4, wherein the screw rod 4 is exposed out of an adapted anchor hole 5, the arch support body 1 is made of a steel plate, the center of the arch support body is bulged outwards to form a bulged part 11, a through hole 12 is formed in the center of the bulged part 11, and the through hole 12 is sleeved on the screw rod 4,
fastening nut 2 is established soon on screw rod 4, fastening nut 2 and 4 screw-thread fit of screw rod, and fastening nut 2 and 4 screw threads of screw rod are self-locking thread, and fastening nut 2 presses on the uplifted portion 11, its characterized in that: it still includes a rotatory section of thick bamboo 6, 4 one ends of screw rod are direct to link firmly with the 6 outer ends of a rotatory section of thick bamboo are coaxial to integrated into one piece, and 3 outer ends of stock body are equipped with the external screw thread, 6 cover soon of a rotatory section of thick bamboo is on 3 outer ends of stock body, the two screw-thread fit, and the lead angle of its screw thread is 60-65, 2 main parts of fastening nut are frustum shape, and 2 tip external diameters of fastening nut < the through-hole 12 diameter on the swelling portion 11 < the 2 main aspects external diameters of fastening nut, and 11 peripheral arch supporters 1 of swelling portion press on 5 peripheral country rocks 7 in adapted anchor hole, and its tip still outwards extends a cylinder section 8.
As shown in FIG. 1, the outer end of the adapted anchor hole 5 is enlarged to form an enlarged hole 51.
As shown in fig. 1 to 4, the rotary cylinder 6 is disposed in the enlarged hole 51. The anchor body 3 is also provided with a rubber damping pad 9, and the rubber damping pad 9 is clamped between the rotary cylinder 6 and the surrounding rock 7 at the inner end of the enlarged hole 51. The inner surface and the outer surface of the bulge part 11 are spherical.
The friction constant-resistance grading yielding anchor rod further comprises a supporting rigid ring 10, the supporting rigid ring 10 is sleeved on the screw rod 4, the inner end face of the supporting rigid ring 10 is pressed on the rotating cylinder 6, and the outer edge of the supporting rigid ring 10 abuts against the edge of the inner wall of the bulge part 11.
This constant resistance of friction lets in grades and presses stock still includes the stationary vane 13 that ends soon, and this end and revolve stationary vane 13 and set up between stock body 3 and adapted anchor eye 5 inner wall.
Claims (6)
1. The utility model provides a friction constant resistance lets in grades presses stock, includes arch supporter, fastening nut, stock body and screw rod, the screw rod exposes outside the adapted anchor eye, the arch supporter is made by the steel sheet, and its central outside uplift forms the uplift, and the uplift center is opened there is the through-hole to overlap through this through-hole on the screw rod, fastening nut establishes soon on the screw rod, fastening nut and screw rod screw-thread fit, the screw thread of fastening nut and screw rod is self-locking thread, and fastening nut presses in the uplift is last, its characterized in that: it still includes a rotatory section of thick bamboo, screw rod one end is direct to link firmly with the outer end of a rotatory section of thick bamboo is coaxial to integrated into one piece, and stock body outer end is equipped with the external screw thread, a rotatory section of thick bamboo is revolved and is overlapped on this external end of stock, the two screw-thread fit, and the lead angle of its screw thread is 60-65, the fastening nut main part is frustum shape, and fastening nut tip external diameter < the through-hole diameter on the uplift < fastening nut main aspects external diameter, and the peripheral arch supporter of uplift presses on the peripheral country rock adapted of anchor eye, and its tip still outwards extends a cylinder section.
2. The friction constant-resistance graded yielding anchor rod according to claim 1, wherein: the outer end of the matched anchor hole is expanded to form an expanded hole, and the rotary cylinder is arranged in the expanded hole.
3. The friction constant-resistance graded yielding anchor rod according to claim 2, wherein: the anchor rod body is also provided with a rubber damping pad which is clamped between the rotating cylinder and the surrounding rock at the inner end of the enlarged hole.
4. The friction constant-resistance graded yielding anchor rod according to claim 3, wherein: the inner surface and the outer surface of the bulge part are spherical.
5. The friction constant-resistance graded yielding anchor rod according to claim 4, wherein: the supporting rigid ring is sleeved on the screw rod, the inner end face of the supporting rigid ring is pressed on the rotating cylinder, and the outer edge of the supporting rigid ring abuts against the edge of the inner wall of the bulge part.
6. The friction constant-resistance graded yielding anchor rod according to any one of claims 1 to 5, characterized in that: the anchor rod further comprises a rotation stopping fixed wing, and the rotation stopping fixed wing is arranged between the anchor rod body and the inner wall of the adapted anchor hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023016691.4U CN214063015U (en) | 2020-12-14 | 2020-12-14 | Friction constant-resistance grading yielding anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023016691.4U CN214063015U (en) | 2020-12-14 | 2020-12-14 | Friction constant-resistance grading yielding anchor rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214063015U true CN214063015U (en) | 2021-08-27 |
Family
ID=77408558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023016691.4U Active CN214063015U (en) | 2020-12-14 | 2020-12-14 | Friction constant-resistance grading yielding anchor rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214063015U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075853A (en) * | 2022-07-01 | 2022-09-20 | 同济大学 | Take prestressing force to increase in grades and hinder and let pressure stock |
-
2020
- 2020-12-14 CN CN202023016691.4U patent/CN214063015U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075853A (en) * | 2022-07-01 | 2022-09-20 | 同济大学 | Take prestressing force to increase in grades and hinder and let pressure stock |
| CN115075853B (en) * | 2022-07-01 | 2023-09-15 | 同济大学 | Grading resistance-increasing yielding anchor rod with prestress |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214063015U (en) | Friction constant-resistance grading yielding anchor rod | |
| CN106567331A (en) | Adjustable wire stay rope anchor | |
| CN109026105A (en) | The anchor rod component and its method for protecting support of coal mine roadway buffering surrouding rock deformation | |
| CN113027500B (en) | Outward-expansion friction type constant-resistance energy-absorbing anchor cable and using method thereof | |
| CN102031873B (en) | Hydraulic tensioner of fixed-torque locking prestressed anchor | |
| CN112483156A (en) | Friction constant-resistance grading yielding anchor rod | |
| CN210239718U (en) | Pressure-yielding fastening device for protecting anchor rod and anchor tail thread section | |
| CN107611899B (en) | Angle-adjustable strain clamp | |
| CN209509532U (en) | A kind of self-locking anchorage of compressor wire tensioning | |
| CN113374177B (en) | Anchor device | |
| JP6144086B2 (en) | Steel pipe pile joint structure | |
| CN206128447U (en) | Automatic push -pull system is opened to anchor and steel strand wires prestressing force | |
| CN216588665U (en) | Full-length anchoring anti-shearing large-deformation anchor rod | |
| CN111594244A (en) | III type resistance-increasing deformation anchor cable for deep yielding support and assembling and working method | |
| CN112922654B (en) | External expansion friction type constant-resistance energy-absorbing anchor rod and use method thereof | |
| CN206127892U (en) | Push -pull system is opened to closing device and steel strand wires prestressing force | |
| CN106382322B (en) | A kind of complex spring damper of adjustable initial stiffness | |
| CN214251805U (en) | Conical workpiece drawing clamp | |
| CN211525768U (en) | Mining pump elastic flange | |
| CN213869920U (en) | Torque quantitative output device for prestressed anchor rod | |
| CN106382317B (en) | A kind of complex spring damper that early stage rigidity is predeterminable | |
| CN201835534U (en) | Hydraulic tensioning device for locking prestressing anchor rod with fixed torque | |
| CN216588666U (en) | Anti-shearing anchor bolt supporting device capable of being installed quickly | |
| CN217558319U (en) | Anti-torsion supporting shoe for thrust cylinder of shield machine | |
| CN207848138U (en) | A kind of self-pulling type anchor bolt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |