CN101943014A - Displacement release type anchor head device - Google Patents
Displacement release type anchor head device Download PDFInfo
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- CN101943014A CN101943014A CN 201010249697 CN201010249697A CN101943014A CN 101943014 A CN101943014 A CN 101943014A CN 201010249697 CN201010249697 CN 201010249697 CN 201010249697 A CN201010249697 A CN 201010249697A CN 101943014 A CN101943014 A CN 101943014A
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Abstract
The invention discloses a displacement release type anchor head device which comprises an anchor bolt body and a hollow stress release device sheathed and fixed on the anchor bolt body, wherein a plurality of stress release holes are uniformly distributed and arranged on the surface of the hollow stress release device, and the axial compressive strength of the hollow stress release device is smaller than that of the anchor bolt body. The anchor head device is based on the property that the anchor head device can provide the larger space for the deformation of an anchor bolt by compressing a stress release disc during the deformation of a laneway and can better control the deformation, and the premise is that the combined strength of the stress release disc is lower than the tensile strength of the anchor bolt; the uniaxial compression test of the stress release disc finds that the compression process is reversible, the stress release disc can be reused for 2-3 times, and the anchor head device can ensure that the strength is not greatly reduced, thereby reducing the support cost; and the scheme of optimizing the design of the stress release disc can lead the stress release disc to achieve the flexible damage, avoid the production of any cracks or tear sparks, and be conveniently applied in high-gas mines.
Description
Technical field
The present invention relates to a kind of displacement release type anchor head device of supporting roadway surrounding rock.
Background technology
Roadway support mainly is to provide certain supporting resistance to country rock, or the reinforcing country rock makes at country rock superficial part formation back-up coat, its essential is to control dilatation distortion such as open in absciss layer, slip, the crack of anchorage zone country rock, new crackle generation and destroys, in the anchorage zone, form the bigger secondary bearing structure of rigidity, development with the control plastic zone of surrounding rock, stop generation absciss layer in rock stratum outside the anchorage zone, improve the stress distribution in country rock deep simultaneously.Final purpose is to reduce surrounding rock displacement, keeps adjoining rock stability.Roadway support can be adopted two kinds of approach: 1. strengthen the rigidity of supporting and protection structure, improve the supporting resistance, to reduce surrouding rock deformation.2. support system itself has certain scalability, is out of shape with suitable for surrounding rock.Adopt second kind of support system, can produce relatively large rock deformation, as long as but the deflection in tunnel can be controlled at satisfied production in the scope that needs allowed, at this moment, required supporting resistance and rigidity are all little than first kind of scheme, reach not only economic, but also rational purpose.
West Germany, the Soviet Union, the U.S. are in the existing anchor pole technology that can the stretch fifties in last century, and China begins development the seventies, can they be reduced the extending and structural member of the body of rod extending two big classes of sliding by operating principle.
The typical extending anchor pole of the body of rod has the crooked undaform of the body of rod of the Thyssen type and the former Soviet Union.The two ends of the gloomy type anchor pole of the base of a fruit are one section stretchable austenitic steel of welding in the middle of the common carbon Suo Gang, rely on the big austenitic steel of elongation per unit length to reach the stressed back of the anchor pole body of rod self and stretch.The ultimate elongation amount of anchor pole can reach 517mm, and maximum operation resistance is 200KN, but it adopts chromium one nickel alloy steel manufacturing, thereby costs an arm and a leg, so less use in the production reality.
The crooked extending anchor pole of the body of rod of former Soviet Union development is to do waviness with common carbon Suo Gang, after the suffered tensile stress of the body of rod reaches certain value then the waveform section body of rod begin stretching, thereby provide certain working resistance and certain elongation for anchor pole.
Summary of the invention
At the problem that prior art exists, the object of the present invention is to provide a kind of structure through the displacement release type anchor head device that improves, mechanical property is good, practical, easy to use.
For achieving the above object, displacement release type anchor head device of the present invention, comprise anchor rod body, suit and hollow stress release device fixed thereon, evenly distributing on the surface of this hollow stress release device is provided with several stress relief holes, and the axial compressive strength of hollow stress release device is less than the axial compression strength of anchor rod body.
Further, described hollow stress release device comprises the some groups of stress release dishes that fasten setting mutually, this stress release dish comprises bowl-shape disc, and the edge of this disc is outward extended with the annular edge edge, and two stress release dishes are one group of assembly against fastening by the annular edge edge mutually; The central part of disc is provided with the installing hole that is used to be sleeved on the described anchor rod body, uniformly on the disc is provided with 4 first stress relief holes, is provided with second stress relief hole between two the first adjacent stress relief holes.
Further, described first stress relief hole is made up of as two semicircle orifices of diameter with being separately positioned on its minor face and with this minor face a rectangular opening; Described second stress relief hole is a circular hole.
Further, be provided with stop grouting plug, top board, bottom plate and hold-down nut on the described anchor rod body from top to bottom, described hollow stress release device is arranged between this top board and the bottom plate, the installing hole of stop grouting plug sealing top board and the gap between the anchor rod body, hold-down nut is fixedly mounted on the anchor rod body by helicitic texture, is installed in each position component on the anchor rod body with qualification.
Further, the material of described stress release dish is a mild steel.
Displacement release type anchor head device of the present invention, when being based on roadway deformation, by shriveling the stress release dish, for the distortion of anchor pole provides bigger space, controlled deformation preferably, its prerequisite is the tensile strength that the combined strength of stress release dish will be lower than anchor pole; Carry out uniaxial compression test by counter stress release dish, find that its compression process is reversible, that is to say, the stress release dish can reuse 2-3 time and guarantee that its intensity does not have too big reduction, greatly reduces support cost; By optimizing stress release dish design scheme, all make it reach flexible and destroy, can not produce any crackle and tear spark, can use at highly gassy mine easily.
Description of drawings
Fig. 1 is a stress release dish front view;
Fig. 2 is a stress release dish vertical view;
Fig. 3 is a structural representation of the present invention;
Fig. 4-1 is a SRP-1 stress release dish structural representation;
Fig. 4-2 is a SRP-2 stress release dish structural representation;
Fig. 4-3 is a SRP-3 stress release dish structural representation;
Fig. 4-4 is a SRP-4 stress release dish structural representation;
Fig. 4-5 is a SRP-5 stress release dish structural representation;
Fig. 4-6 is a SRP-6 stress release dish structural representation;
Fig. 4-7 is a SRP-7 stress release dish structural representation;
Fig. 4-8 is a SRP-8 stress release dish structural representation;
Fig. 4-9 is a SRP-9 stress release dish structural representation;
Fig. 5-1 is a SRP-1 stress release dish compression back pictorial diagram;
Fig. 5-2 is a SRP-2 stress release dish compression back pictorial diagram;
Fig. 5-3 is a SRP-3 stress release dish compression back pictorial diagram;
Fig. 5-4 is a SRP-4 stress release dish compression back pictorial diagram;
Fig. 5-5 is a SRP-5 stress release dish compression back pictorial diagram;
Fig. 5-6 is a SRP-6 stress release dish compression back pictorial diagram;
Fig. 5-7 is a SRP-7 stress release dish compression back pictorial diagram;
Fig. 5-8 is a SRP-8 stress release dish compression back pictorial diagram;
Fig. 5-9 is a SRP-9 stress release dish compression back pictorial diagram;
Fig. 6-1 is the single group of a SRP-1 stress release dish uniaxial compression load-time graph;
Fig. 6-2 is the single group of a SRP-2 stress release dish uniaxial compression load-time graph;
Fig. 6-3 is the single group of a SRP-3 stress release dish uniaxial compression load-time graph;
Fig. 6-4 is the single group of a SRP-4 stress release dish uniaxial compression load-time graph;
Fig. 6-5 is the single group of a SRP-5 stress release dish uniaxial compression load-time graph;
Fig. 6-6 is the single group of a SRP-6 stress release dish uniaxial compression load-time graph;
Fig. 6-7 is the single group of a SRP-7 stress release dish uniaxial compression load-time graph;
Fig. 6-8 is the single group of a SRP-8 stress release dish uniaxial compression load-time graph;
Fig. 6-9 is the single group of a SRP-9 stress release dish uniaxial compression load-time graph;
Fig. 7 is three groups of stress release dish uniaxial compression load-time graphs of SRP-9.
The specific embodiment
As shown in Figure 1 to Figure 3, displacement release type anchor head device of the present invention, comprise anchor rod body 1, suit and hollow stress release device fixed thereon, be provided with stop grouting plug 5, top board 3, bottom plate 4 and hold-down nut 6 on the anchor rod body 1 from top to bottom, the hollow stress release device is arranged between this top board 3 and the bottom plate 4, the installing hole of stop grouting plug 5 sealing top boards 3 and the gap between the anchor rod body 1 prevent that country rock 7 from flowing into.Hold-down nut 6 is fixedly mounted on the anchor rod body 1 by helicitic texture, is installed in each position component on the anchor rod body 1 with qualification.
The hollow stress release device comprises the some groups of hollow stress release dishes 2 that fasten setting mutually, stress release dish 2 comprises bowl-shape disc 11, it against fastening is one group assembly by annular edge mutually along 12 along 12, two stress release dishes that the edge of disc 11 is outward extended with annular edge; The central part of disc 11 is provided with the installing hole 8 that is used to be sleeved on the anchor rod body 1, in the present embodiment, uniform 4 first stress relief holes 10 that are provided with on the disc 11, be provided with second stress relief hole 9 between two the first adjacent stress relief holes 10, each stress relief hole all around the axially evenly distribution of hollow stress release device, be made up of as two semicircle orifices of diameter with being separately positioned on its minor face and with this minor face a rectangular opening by first stress relief hole 10; Second stress relief hole 9 is a circular hole.The material of stress release dish 2 is a mild steel, and its axial compressive strength is less than the axial compression strength of anchor rod body 1.
In the displacement release type anchor head device of the present invention, the hollow stress release device comprises two bowl-shape stress release dishes 2, two dish make-ups fasten, and the hollow space of its formation is to offer when anchor pole stretches to compress, and its prerequisite is the tensile strength that the uniaxial compressive strength of stress release dish assembly is lower than anchor pole, like this, when roadway deformation, stress release Pan Chu can at first pressure be reached, by shriveling it, be reached for bolt deformation the purpose in space is provided, drawn the bad time to reach the prolongation anchor pole.The group number of stress release dish specifically is set, can be according to on-the-spot geological conditions, the monitoring materials in early stage or theoretical calculating.
Based on above-mentioned mentality of designing, what at first need to satisfy is that this stress release dish can compress when pressurized most possibly, and its cavity is all utilized; Secondly, shrivel the stress release dish and crackle had better not occur, because for highly gassy mine, the spark that any metal is torn generation all is fatal; At last, the stress release dish load peak after the combination should be controlled in the 60-80KN scope, promptly produces in anchor pole in advance and destroys; By carrying out the stress release dish uniaxial compression test of two bowl make-ups, and compare several multi-form stress release dish compression performances, determined following design scheme.
By the stress release dish make-up uniaxial compression test of right different designs external form, different size, can obviously find out the further optimization of design.
SRP-1: see Fig. 4-1, adopt the brim of a hat formula support holder structure, in the uniaxial compression process, along with the increase of compression displacement amount, the equal slump of two stress release dish crowns is inner to dish, cause the central circular butt joint of two stress release dishes, see Fig. 5-1, suppress further developing of distortion, cause decrement to reduce, can not reach default effect, see Fig. 6-1.
By reducing the outward flange width, distortion is more easily spread to the stress release plate edge, fold the hole that difformity, varying number, different sizes are set up in the position, arch in stress release simultaneously, reduce the bulk strength of stress release dish, and proof stress release dish guarantees not occur tearing in the edge of dish simultaneously when shriveling, because at high fiery colliery, the spark that any metal is torn generation all is fatal, so, the design scheme of following several stress release dishes has been arranged.
SRP-2: see Fig. 4-2, the outward flange width on the basis of original 15mm, is reduced 10mm, and its outer edges 4 arc groove millings at equidistant quarter (arc radius 5.85mm, the groove milling bottom surface is controlled at about 1mm apart from the outward flange bottom surface).The distortion of stress release dish middle part annulus can be shifted to 4 groove millings place, and cause along the drawing crack at groove milling edge, at this moment, the distortion at annulus middle part is able to satisfy the purpose that enlarges the compression displacement amount to the diffusion of annulus edge.The uniaxial compression test result shows this stress release dish compression stroke to greatest extent, for stretching, anchor pole provides Free up Memory, and can also save sheet material, utilize raw material to greatest extent, but adopt the stress release dish of this design drawing crack to occur in the groove milling position, see accompanying drawing 5-2, Fig. 6-2, so get rid of;
SRP-3: see Fig. 4-3, the arc groove milling of mentioning among the SRP-2 is increased to 8, the same SRP-2 of size, its result's load is all controlled relative better with the compression displacement amount, see Fig. 6-3, but all fracture occurs, see Fig. 5-3, tear the sound during fracture once in a while, be not suitable for high fiery colliery, so get rid of;
SRP-4: see Fig. 4-4, folding the position, arch increases by 2 holes, and the Kong Youyi del adds a semicircle and forms, the wide 12mm in triangle base, the base is to circular arc summit 15mm, radius of circle 2mm, the circle outermost end is apart from outward flange 21mm, though fracture does not appear in its result, see Fig. 5-4, but the one or two peak value is all higher, sees Fig. 6-4, so get rid of;
SRP-5: see Fig. 4-5, folding the position, arch increases by 4 holes, and the same SRP-4 of size is less because of its decrement, load peak is higher, sees Fig. 5-5, Fig. 6-5, so eliminating;
SRP-6: see Fig. 4-6, folding the position, arch increases by 4 holes, and the Kong Youyi rectangle adds two semicircles and forms, the long 12mm of rectangle, wide 8mm, semicircle radius 6mm, semicircle distance center hole, top outward flange 24.5mm is not though the bottom semicircle fracture occurs apart from outward flange 11mm, see Fig. 5-6, but the one or two peak value is all higher, sees Fig. 6-6, so get rid of;
SRP-7: see Fig. 4-7, folding the position, arch increases by 4 holes, and the Kong Youyi rectangle adds two semicircles and forms, the long 14mm of rectangle, and wide 12mm, two ends are respectively two semicircles, radius 6mm, semicircle distance center hole, top outward flange 24.5mm, the bottom semicircle is apart from outward flange 5mm.Fracture all occurs, see Fig. 5-7, load and compression displacement amount are all controlled relative better, see Fig. 6-7, tear the sound during fracture once in a while, are not suitable for high fiery colliery, so eliminating;
SRP-8: see Fig. 4-8, global design such as SRP-2, a long 1cm is carved in each groove milling and arch camber place in addition, the link slot of dark 1mm.Load and compression displacement amount are all controlled relative better, see Fig. 6-8, but all fracture occurs, see Fig. 5-8, tear the sound during fracture once in a while, are not suitable for high fiery colliery, so eliminating;
SRP-9: see Fig. 4-9, global design such as SRP-7, because of the SRP-7 bulk strength still high, so between hollow hole, add the circular hole of a diameter 12mm, fracture does not appear, see Fig. 5-9, load and compression displacement amount are all controlled preferably simultaneously, see Fig. 6-9, so finally design this scheme of employing.
By SRP-9 being carried out three groups of bowl uniaxial compression tests, find that it meets peak value all the time in the interval fluctuation of 60-80KN, sees accompanying drawing 7
By the colliery tunnel support design experiences as can be known, sandstone coal mine support type anchor pole tensile strength is generally at 60-80KN, first, second load peak all is controlled in the tensile strength scope of anchor pole, could guarantee before reaching anchor pole tensile strength, shrivel the stress release dish, need reach the maximum compression displacement simultaneously and fracture can not occur, reach the flexible destruction of final generation.
The present invention has improved the anchor head part of anchor pole in the prior art, adopt a kind of novel anchorage head device, this anchorage head device is a kind of stress release device, as shown in Figure 3, stress release device in the present embodiment is--displacement stress releasing device, this displacement stress releasing device are the member of bowl-shape band outer, and there is fixedly form processing at bowl arc place and a bowl extension place, the crown center position of member has circular port, and the circular hole aperture should be slightly larger than bolt diameter.The member of two bowl-shape band outers is one group during use, two member one positive one relative being buckled together of anti-the rim of a bowl, and just the outer part of member contacts, and is enclosed within an end of anchor pole then.The member of bowl-shape band outer adopts mild steel equal strength toughness plasticity material preferably, and the intensity of the anti-axial compression of one group stress release device should be less than the intensity of the anti-axial compression of anchor pole.During use, be at string bowl top and the bottom of string bowl the supporting plate liner all be installed passed to stress release device in order to power with country rock.
During use, need at first anchor pole to be mounted to the use location, its installation steps are specially: (1) at first plays the boring with the adaptive aperture of skyhook in the installation process of anchor pole.(2) anchor pole was installed (3) before Installation Stress discharges bowl, earlier a slice supporting plate is installed on the anchor pole (4) with the stress release bowl pass bowl mesopore respectively a make-up install.(3) put supporting plate well, fastening nut adds pretightning force, complete operation.In the actual use, because its compressive strength of every group stress release device is less than the compressive strength of anchor pole, be subjected to axial compression above after the compressive strength of stress release device, stress release device can produce distortion prior to anchor pole, showing as bowl-shape stress release device in this example can be crushed, will axially discharge certain space after the flattening, sharing the pressure that anchor rod body is born in the ever-increasing process of country rock off-load springback capacity.Between anchor pole and relaxation zone 3, produce corresponding compatibility of deformation.Make anchor pole can continue to play a role, supporting and rock mass remain a supporting integral body, and acting in conjunction prolongs the application life of bolt support, and the maintenance cycle in tunnel lengthening is reached for production safety assurance, the purpose of increasing economic efficiency are provided like this.
Bowl-shape band outer stress release device only is one embodiment of the present of invention; other similarly can produce the structure that the space discharges when being subjected to axial stress, for example: rectangle ducted body, spherical ducted body; springs etc. all can be applied among the present invention, also are to belong in protection scope of the present invention.
Claims (5)
1. displacement release type anchor head device, it is characterized in that, this device comprises anchor rod body, suit and hollow stress release device fixed thereon, evenly distributing on the surface of this hollow stress release device is provided with several stress relief holes, and the axial compressive strength of hollow stress release device is less than the axial compression strength of anchor rod body.
2. displacement release type anchor head device as claimed in claim 1, it is characterized in that, described hollow stress release device comprises the some groups of stress release dishes that fasten setting mutually, this stress release dish comprises bowl-shape disc, the edge of this disc is outward extended with the annular edge edge, and two stress release dishes are one group of assembly against fastening by the annular edge edge mutually; The central part of disc is provided with the installing hole that is used to be sleeved on the described anchor rod body, uniformly on the disc is provided with 4 first stress relief holes, is provided with second stress relief hole between two the first adjacent stress relief holes.
3. displacement release type anchor head device as claimed in claim 2 is characterized in that, described first stress relief hole is made up of as two semicircle orifices of diameter with being separately positioned on its minor face and with this minor face a rectangular opening; Described second stress relief hole is a circular hole.
4. displacement release type anchor head device as claimed in claim 1, it is characterized in that, be provided with stop grouting plug, top board, bottom plate and hold-down nut on the described anchor rod body from top to bottom, described hollow stress release device is arranged between this top board and the bottom plate, the installing hole of stop grouting plug sealing top board and the gap between the anchor rod body, hold-down nut is fixedly mounted on the anchor rod body by helicitic texture, is installed in each position component on the anchor rod body with qualification.
5. displacement release type anchor head device as claimed in claim 2 is characterized in that, the material of described stress release dish is a mild steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102496978A CN101943014B (en) | 2010-08-10 | 2010-08-10 | Displacement release type anchor head device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102496978A CN101943014B (en) | 2010-08-10 | 2010-08-10 | Displacement release type anchor head device |
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| CN101943014A true CN101943014A (en) | 2011-01-12 |
| CN101943014B CN101943014B (en) | 2012-07-25 |
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| CN2010102496978A Expired - Fee Related CN101943014B (en) | 2010-08-10 | 2010-08-10 | Displacement release type anchor head device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431623A (en) * | 2020-10-26 | 2021-03-02 | 河南理工大学 | Multistage energy-absorbing anchor rod and construction method thereof |
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| SU883479A1 (en) * | 1980-03-14 | 1981-11-23 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Горно-Металлургический Институт Цветных Металлов | Anchor roof support lock |
| CN200996296Y (en) * | 2007-01-11 | 2007-12-26 | 中国矿业大学 | High-strength decompressing slip-casting rockbolt |
| CN201367909Y (en) * | 2009-03-06 | 2009-12-23 | 山东科技大学 | Novel anchor rod with end anchorage and full-length radial anchorage |
| CN201377330Y (en) * | 2009-03-17 | 2010-01-06 | 山东恒达矿山支护有限公司 | Wing compressible pallet and horseshoe cushion |
| CN201486580U (en) * | 2009-08-12 | 2010-05-26 | 济宁矿安支护材料有限公司 | Controllable pretightening force pressure relief anchor rope |
| CN101725364A (en) * | 2009-11-24 | 2010-06-09 | 中国科学院力学研究所 | Displacement release type anchor head device |
-
2010
- 2010-08-10 CN CN2010102496978A patent/CN101943014B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU883479A1 (en) * | 1980-03-14 | 1981-11-23 | Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Горно-Металлургический Институт Цветных Металлов | Anchor roof support lock |
| CN200996296Y (en) * | 2007-01-11 | 2007-12-26 | 中国矿业大学 | High-strength decompressing slip-casting rockbolt |
| CN201367909Y (en) * | 2009-03-06 | 2009-12-23 | 山东科技大学 | Novel anchor rod with end anchorage and full-length radial anchorage |
| CN201377330Y (en) * | 2009-03-17 | 2010-01-06 | 山东恒达矿山支护有限公司 | Wing compressible pallet and horseshoe cushion |
| CN201486580U (en) * | 2009-08-12 | 2010-05-26 | 济宁矿安支护材料有限公司 | Controllable pretightening force pressure relief anchor rope |
| CN101725364A (en) * | 2009-11-24 | 2010-06-09 | 中国科学院力学研究所 | Displacement release type anchor head device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431623A (en) * | 2020-10-26 | 2021-03-02 | 河南理工大学 | Multistage energy-absorbing anchor rod and construction method thereof |
| CN112431623B (en) * | 2020-10-26 | 2022-10-04 | 河南理工大学 | Multistage energy-absorbing anchor rod and construction method thereof |
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