CN102337914A - Welding type anchor rod with dynamic and static combination - Google Patents
Welding type anchor rod with dynamic and static combination Download PDFInfo
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- CN102337914A CN102337914A CN2011103324935A CN201110332493A CN102337914A CN 102337914 A CN102337914 A CN 102337914A CN 2011103324935 A CN2011103324935 A CN 2011103324935A CN 201110332493 A CN201110332493 A CN 201110332493A CN 102337914 A CN102337914 A CN 102337914A
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- anchor pole
- rock
- anchor rod
- hard
- country rock
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Abstract
The invention discloses a welding type anchor rod with dynamic and static combination. The anchor rod is manufactured by welding a rod body made of a high-strength threaded steel material and a rod body made of a round steel material with the elongation more than 30%; the rod body made of the round steel material is arranged in the middle of the whole anchor rod, and the section is not bound and anchored with surrounding rock, and the other part of the anchor rod is made of the threaded steel material and is anchored in the whole length; the round-steel section can be used as an extensible member providing the deformation capability, and is arranged near the boundaries of a fracture softening area and an elastic area of the surrounding rock, so that a certain compensation space for expansion and deformation is provided for the surrounding rock in the boundary effect of the stress wave; and the tail part of the anchor rod is bound and anchored, can be suitable for laminar-crack peeling damage of the wall surface of a hard-rock roadway, and can provide a reinforcement action for the fractured surrounding rock of the softening area. The welding type anchor rod can adapt to the characteristic of complete hard-brittle surrounding rock damage under higher stress condition, can resist the static and dynamic load action of the hard-rock roadway, realizes the control on the damage of the hard-rock roadway, and has the advantages of strong pertinence, simplicity in manufacture and processing and simplicity and convenience in operation.
Description
Technical field
The present invention relates to the support apparatus in a kind of hard crisp country rock tunnel, particularly relate to a kind of extending anchor pole of preventing and treating the rock burst disaster, belong to geotechnical engineering anchoring field.
Background technology
In the underground construction of deep solid rock under excavation off-load effect, often peel off, brittle fracture phenomenons such as slabbing, wall caving and rock burst.The characteristics of the hard and compact of hard rock own; Causing the reason of its destruction to relate to the category of dynamic rock mechanics and rock statics two aspects, can be (the seeing work " receiving the catastrophic model of the Dynamic Rock fracture of action of static load " 2004 the 6th phases of coal journal such as left space army) that bears that heavily stressed hard rock body brings out under less exterior power disturbance like rock burst.Dynamic stress when rock burst takes place in the hard rock cavern is very big; Generally can meet or exceed the yield strength of support unit; If letting, support system do not press and surrender character; Just unavoidably destroy, anchor pole can effectively be regulated and control the self-bearing capacity of country rock, so the hard rock support system also adopts extending anchor pole to provide certain distortion to destroy the pressure large deformation that causes to hold rock burst.
Extending anchor pole reduces by operating principle that the body of rod is extending to slide extending two big types with structural member; Be with one section extending anchor pole etc. that rises by pipe and increase resistance pipe like the patent No. 93203496.9 disclosed zigzag expansion shell type pressure-relieving achor bars, the patent No. 201020632589.4 disclosed anchor pole tails and belong to structural member and slide type, can stretch anchor pole etc. of the patent No. 88204483.4 disclosed snakelike extending anchor poles, the patent No. 87211250 disclosed H type bodies of rod belongs to extending type of the body of rod.Present extending anchor pole mainly is to propose to the large deformation soft rock; Usually adopt the mode of end anchorage for the elongation that realizes anchor pole; It is anchor head and hole bed rock body is fixed and the anchor pole tail is used the pallet pretension; These anchor poles are applicable to that usually soft rock distortion keeps the characteristics of country rock integrality continuously, but the hard rock tunnel than the high-ground stress effect the surperficial rock mass slabbing of normal down generation peel off (like Dali, the buried seepage tunnel of Jinping hydropower station country rock), cause the anchor pole pallet unsettled; The anchor pole of end anchorage will lose the effect of reinforcing country rock this moment, thereby the country rock that further brings out this bolt support zone destroys.Thus it is clear that, when the extending anchor pole under the hard rock condition adopts end anchorage, often do not have the effect of anchoring.
For solving the supporting problem in hard rock tunnel; At the extending anchor pole that has proposed a little anti-rock bursts aspect the reply rock burst disaster; Disclosing a kind of prolonging-elastic reactance rock burst anchor pole like patent No. 201020602613.X, though the body of rod is provided with waveform segment and stiffness spring, but still is end anchorage; Patent No. 201020684957.X discloses a kind of water swelling formula elastic reactance rock burst anchor pole; Though can realize full length fastening; Can overcome the influence that wall rock mass slabbing is peeled off, but water swelling formula anchor pole supporting capacity is low, inapplicable during than high-ground stress; Stiffness spring only is the improvement of being extended in the surface, tunnel simultaneously, and the deformability under full length fastening is very weak.The rock burst support technology is different with conventional supporting; Supporting and protection structure under the rock burst condition not only will be able to take the effect of the heavily stressed load under the static conditions, also will resist in the extraneous work progress or stress wave activity that suffered afterwards blasting vibration, mechanical oscillation, earthquake and adjacent rock burst produce.People such as brilliant bodyguard point out that in civilian " the strong and weak powerful model and the applied analysis thereof of the control of impulsion pressure roadway surrounding rock " (2008 the 2nd phases of rock mechanics) rock burst is brought out in the stress wave impact and the roadway surrounding rock structure has close ties; There are some researches show simultaneously at break softened zone and elastic region intersection of country rock and be prone to produce the stress wave boundary effect and bring out rock burst; Therefore, the anchor pole performance also must adapt to the characteristics of hard crisp country rock internal disturbance.Therefore the quiet supporting capacity of extending anchor pole under the existing hard rock condition is low, and can not satisfy hard crisp country rock wall surface layer and split the damage feature with the disturbance of country rock internal motivation.
Summary of the invention
Problem to be solved by this invention provides and a kind ofly overcomes hard crisp country rock wall surface layer and split with the destroying infection of inner country rock energetic disturbance and keep pressure-bearing, continue to let the sound assembled bolt of compressive strain ability.
For high-ground stress hard rock tunnel; Especially having under the rock burst tendentiousness condition, a kind of desirable anchor pole should be before its damage inactivation, to provide image tube seam formula anchor pole the same large deformation ability, to provide the surrounding rock failure dilatation broken bloated space; Again advantages of high bearing capacity can be provided; Have the same high intensity with the regular screw threads anchor pole, adopt the anchorage style of suitable for surrounding rock internal motivation disturbance simultaneously, the anchor pole that meets these conditions promptly is called the sound assembled bolt.
In order to solve the problems of the technologies described above; The solution that welded type sound assembled bolt of the present invention proposes does; A kind of welded type sound assembled bolt; Anchor rod body is welded greater than 30% anchor pole stage casing by anchor pole rear and anchor pole head section and elongation per unit length, and wherein: anchor pole rear and anchor pole head section adopt anchoring agent and hole wall country rock bond-anchorage; The anchor pole stage casing does not bond with the hole wall country rock, but Free Transform elongation after stressed; The anchor pole rear is furnished with clamp nut and is installed on pallet.
Further, can the anchor pole stage casing be arranged in country rock internal rupture softened zone and elastic region boundary vicinity, this border can be confirmed by test.The anchor pole stage casing is arranged on this boundary vicinity, can better overcomes the disturbance of stress wave.
Further, anchor pole head section is selected rapid resin anchoring agent and country rock bonding for use, and the anchor pole rear is selected slow resin anchoring agent and country rock bonding for use, and the resin-bonded mastic of can packing in the anchor pole stage casing is to isolate anchor pole rear and anchor pole head section.Rapid resin anchoring agent is pre-load nut better, and the slow resin anchoring agent of anchor pole rear then can better be consolidated the pretension of nut.
Further, anchor pole rear and anchor pole head section all adopt the high-strength deformed steel bar material body of rod, and the round steel of big elongation per unit length is adopted in the anchor pole stage casing.Adopt the anchor pole of this material, its bearing load ability is stronger.
Adopt the welded type sound assembled bolt of technique scheme; Anchor rod anchored section is adopted the high-strength deformed steel bar material that very high quiet supporting capacity can be provided; The deformable welding section of the body of rod can effectively be regulated and control the self-bearing capacity of country rock; With the needed compensation space of suitable for surrounding rock internal sabotage; The surperficial problem that is prone to inefficacy of country rock when the bar stern anchor can be avoided end anchorage admittedly guarantees that hard rock bolt support system yield deformation when disasters such as generation rock burst also still keeps certain drag, has the ability quiet, the dynamic load effect that resists on performance.
In sum; The present invention is that a kind of adaptation is than complete hard crisp surrounding rock failure characteristics under the high-ground stress condition; Can resist hard rock tunnel suffered quiet, dynamic load effect, realize with strong points, the sound assembled bolt that fabrication and processing is simple, easy and simple to handle of prevention and control hard rock roadway destruction.
Description of drawings
Fig. 1 is the medium rock burst welded type sound assembled bolt sketch map of the embodiment of the invention 1.
Fig. 2 is the weak rock burst welded type sound assembled bolt sketch map of the embodiment of the invention 2.
The specific embodiment
Below will combine accompanying drawing and specific embodiment that the present invention is explained further details.
Welded type sound assembled bolt provided by the invention; Anchor pole adopts the high-strength deformed steel bar material body of rod and elongation per unit length to process greater than 30% round steel material body of rod welding; Can adapt to than complete hard crisp surrounding rock failure characteristics under the high-ground stress condition, can resist hard rock tunnel suffered quiet, dynamic load effect.
Embodiment 1: referring to shown in Figure 1, medium rock burst hard rock roadway surrounding rock can form break softened zone 6 and elastic region 7 under the geostatic stress effect, and the scope of the softened zone 6 that breaks can adopt the relaxation zone testing equipment to measure; According to the surrounding rock failure subregion degree of depth of measuring; Select for use the high-strength deformed steel bar and the round steel of big elongation per unit length to process anchor pole respectively by the anchor Design standard; The round steel of big elongation per unit length is adopted in anchor pole stage casing 2; Satisfied break softened zone 6 and each certain distance of two ends, 7 border, elastic region of exceeding of its length, and the suitable deflection that allows by country rock designs; For medium rock burst condition, the supporting bearing strength of having relatively high expectations, so anchor pole rear 1 all adopts high-strength deformed steel bar with anchor pole head section 3, guarantees during making that anchor pole rear 1 and anchor pole head section 3 have sufficient length to be used for the anchoring country rock; Whole anchor pole made and needed through twice welding two place's soldereds 8 are arranged; Adopt the agent of resin anchoring volume; Reserve rod bolt stage casing 2 not anchorings; The anchor bar body of remainder adopts full length fastening; Concrete operations are following: at first will directly select the resin anchoring agent of suitable diameter and length to be used for the anchoring at anchor pole two ends according to aperture and bar, the no curing agent resin clay 2a of the appropriate length of can packing in the anchor pole stage casing 2 be to isolate the effect of two anchoring sections, and the resin anchoring agent of two anchoring sections has difference in setting rate; Bar head anchoring section is selected rapid resin anchoring agent 3a for use, and bar tail anchoring section is selected slow resin anchoring agent 1a for use; During installation rapid resin anchoring agent 3a is placed on the boring inner end; Resin-bonded mastic 2a is at the boring middle part; Slow resin anchoring agent 1a is placed on the boring outer end; Whole anchor pole advances from hell initial line rotation open inward limit under the drive that facility are installed, whole anchor pole is advanced to foot of hole after, the resin anchoring agent in the boring fully mixes the back chemical reaction takes place to be begun to solidify bonding; After rapid resin anchoring agent 3a arrives setting time, begin to go up clamp nut 5 and carry out pretension with 4 pairs of anchor poles of pallet, slow resin anchoring agent 1a can realize the anchoring of anchor pole rear 1 after arriving setting time.
Embodiment 2: referring to shown in Figure 2, weak rock burst hard rock roadway surrounding rock also can form break softened zone 6 and elastic region 7 under the geostatic stress effect, and the scope of the softened zone 6 that breaks can adopt the relaxation zone testing equipment to measure; According to the surrounding rock failure subregion degree of depth of measuring; Select for use the high-strength deformed steel bar and the round steel of big elongation per unit length to process anchor pole respectively by the anchor Design standard; The round steel of big elongation per unit length is adopted in anchor pole stage casing 2; Satisfied break softened zone 6 and each certain distance of two ends, 7 border, elastic region of exceeding of its length, and the suitable deflection that allows by country rock designs; For weak rock burst condition, the supporting bearing strength of requirement is not high, so anchor pole rear 1 employing high-strength deformed steel bar, and anchor pole head section 3 still adopts the round steel of big elongation per unit length, guarantees during making that anchor pole rear 1 and anchor pole head section 3 have sufficient length to be used for the anchoring country rock; Anchor pole stage casing 2 is identical with the material of anchor pole head section 3, so the two can be integrally formed, and whole anchor pole made and only needed through once welding one place's soldered 8 is arranged; Adopt the agent of resin anchoring volume, reserve rod bolt stage casing 2 not anchorings, the anchor bar body of remainder adopts full length fastening, and the concrete operations step is identical with embodiment 1.
The present invention is a kind of welded type sound assembled bolt; This anchor pole can be resisted hard rock tunnel suffered quiet, dynamic load effect; Adaptation is than complete hard crisp surrounding rock failure characteristics under the high-ground stress condition; Can effectively regulate and control the self-bearing capacity of country rock, yield deformation lets press and also still keeps certain drag when disasters such as generation country rock slabbing, rock burst, realizes the effective supporting in hard crisp country rock tunnel.
More than be two kinds of preferences of the present invention, but be not representative full content of the present invention that all equivalents and the change in spirit of the present invention, done all will be in protection domains of the present invention.
Claims (4)
1. welded type sound assembled bolt is characterized in that: anchor rod body is welded greater than 30% anchor pole stage casing (2) by anchor pole rear (1) and anchor pole head section (3) and elongation per unit length, wherein:
Anchor pole rear (1) and anchor pole head section (3) adopt anchoring agent and hole wall country rock bond-anchorage;
Anchor pole stage casing (2) does not bond with the hole wall country rock, but Free Transform elongation after stressed;
Anchor pole rear (1) is furnished with clamp nut (5) and is installed on pallet (4).
2. welded type sound assembled bolt according to claim 1 is characterized in that: anchor pole stage casing (2) are arranged in country rock internal rupture softened zone (6) and elastic region (7) boundary vicinity.
3. welded type sound assembled bolt according to claim 1 and 2 is characterized in that: anchor pole head section (3) is selected rapid resin anchoring agent (3 for use
a) bond with country rock, anchor pole rear (1) is selected slow resin anchoring agent (1 for use
a) bond the resin-bonded mastic (2 of packing in anchor pole stage casing (2) with country rock
a) to isolate anchor pole rear (1) and anchor pole head section (3).
4. welded type sound assembled bolt according to claim 1 and 2 is characterized in that: anchor pole rear (1) and anchor pole head section (3) all adopt the high-strength deformed steel bar material body of rod, and the round steel of big elongation per unit length is adopted in anchor pole stage casing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103324935A CN102337914A (en) | 2011-10-28 | 2011-10-28 | Welding type anchor rod with dynamic and static combination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103324935A CN102337914A (en) | 2011-10-28 | 2011-10-28 | Welding type anchor rod with dynamic and static combination |
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| Publication Number | Publication Date |
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| CN102337914A true CN102337914A (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103324935A Pending CN102337914A (en) | 2011-10-28 | 2011-10-28 | Welding type anchor rod with dynamic and static combination |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102877870A (en) * | 2012-10-18 | 2013-01-16 | 湖南科技大学 | Static and dynamic combined intelligent pre-warning anchor rod |
| CN110057636A (en) * | 2019-04-15 | 2019-07-26 | 中国矿业大学 | The production method of the mold and rock sample of production plus anchor pole rock sample containing crack |
| CN110359937A (en) * | 2019-06-27 | 2019-10-22 | 湖南科技大学 | A kind of roofbolt recovering device and recovery method of sound combination driving |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86208821U (en) * | 1986-11-01 | 1987-11-18 | 东北工学院 | Telescopic type anchor rod |
| WO2007023363A1 (en) * | 2005-08-23 | 2007-03-01 | Pieter Schalk Mulder | An expansible rock bolt |
| WO2007140159A1 (en) * | 2006-05-30 | 2007-12-06 | Jennmar Corporation | Tensionable bolt with hanger |
| CN102031981A (en) * | 2010-11-19 | 2011-04-27 | 湖南科技大学 | Anchoring method of extensible anchor rod |
| CN201857612U (en) * | 2010-11-11 | 2011-06-08 | 中国科学院武汉岩土力学研究所 | Extending-elastic rock-burst-resistant anchor rod |
| CN202280468U (en) * | 2011-10-28 | 2012-06-20 | 湖南科技大学 | Welded-type dynamic and static combined anchor rod |
-
2011
- 2011-10-28 CN CN2011103324935A patent/CN102337914A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86208821U (en) * | 1986-11-01 | 1987-11-18 | 东北工学院 | Telescopic type anchor rod |
| WO2007023363A1 (en) * | 2005-08-23 | 2007-03-01 | Pieter Schalk Mulder | An expansible rock bolt |
| WO2007140159A1 (en) * | 2006-05-30 | 2007-12-06 | Jennmar Corporation | Tensionable bolt with hanger |
| CN201857612U (en) * | 2010-11-11 | 2011-06-08 | 中国科学院武汉岩土力学研究所 | Extending-elastic rock-burst-resistant anchor rod |
| CN102031981A (en) * | 2010-11-19 | 2011-04-27 | 湖南科技大学 | Anchoring method of extensible anchor rod |
| CN202280468U (en) * | 2011-10-28 | 2012-06-20 | 湖南科技大学 | Welded-type dynamic and static combined anchor rod |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102877870A (en) * | 2012-10-18 | 2013-01-16 | 湖南科技大学 | Static and dynamic combined intelligent pre-warning anchor rod |
| CN110057636A (en) * | 2019-04-15 | 2019-07-26 | 中国矿业大学 | The production method of the mold and rock sample of production plus anchor pole rock sample containing crack |
| CN110057636B (en) * | 2019-04-15 | 2024-01-30 | 中国矿业大学 | Mould for manufacturing rock sample with anchor rod and crack and manufacturing method of rock sample |
| CN110359937A (en) * | 2019-06-27 | 2019-10-22 | 湖南科技大学 | A kind of roofbolt recovering device and recovery method of sound combination driving |
| CN110359937B (en) * | 2019-06-27 | 2024-01-23 | 湖南科技大学 | Anchor rod recovery device driven by dynamic and static combination and recovery method |
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Application publication date: 20120201 |
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