CN108343458A - Overall length bonds large deformation pressure-relieving achor bar and its construction method - Google Patents

Overall length bonds large deformation pressure-relieving achor bar and its construction method Download PDF

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Publication number
CN108343458A
CN108343458A CN201810468330.1A CN201810468330A CN108343458A CN 108343458 A CN108343458 A CN 108343458A CN 201810468330 A CN201810468330 A CN 201810468330A CN 108343458 A CN108343458 A CN 108343458A
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CN
China
Prior art keywords
rod
head
anchorage head
sleeve
anchor
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.)
Pending
Application number
CN201810468330.1A
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Chinese (zh)
Inventor
李廷春
殷齐浩
杜贻腾
张�浩
李为腾
王刚
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Shandong University of Science and Technology
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Shandong University of Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shandong University of Science and Technology filed Critical Shandong University of Science and Technology
Priority to CN201810468330.1A priority Critical patent/CN108343458A/en
Publication of CN108343458A publication Critical patent/CN108343458A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • E21D20/025Grouting with organic components, e.g. resin
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts

Abstract

The invention discloses a kind of overall lengths to bond large deformation pressure-relieving achor bar and its construction method, and anchor pole includes mainly expansion anchorage head, the body of rod, corrugated sleeve, pallet and damping nut.The hollow cylinder that anchorage head is inwall processing coarse-pitch thread is expanded, is divided into expandable portion and non-enlarged portion by boundary of circumferential groove;Rod end threading, tail portion setting increase resistance head;Corrugated sleeve includes clamp, bellows segment and flat segments, is recessed outside bellows segment and is filled by rubber deformation layer;The body of rod is connect with sleeve using interference, and sleeve flat segments are arranged external screw thread and install pallet and damping nut.When construction, by anchorage head, slow setting resin explosive roll and assembling after the body of rod and corrugated sleeve be sequentially sent to anchor hole;Pallet and damping nut are installed in sleeve flat segments;Rotary damping nut drives body of rod rotation, until damping plug falls off.The present invention can form certain prestressing force, and provide larger allow and press distance and continuous work resistance, can keep the stability of large deformation country rock, avoid the generation of roof fall accident.

Description

Overall length bonds large deformation pressure-relieving achor bar and its construction method
Technical field
The present invention relates to a kind of overall lengths to bond large deformation pressure-relieving achor bar, belongs to geotechnical engineering anchorage technology field.
Background technology
Suspension roof support be it is a kind of disturb that small, speed of application is fast, safe and reliable, economical rationality reinforcement technique to protolith, energy The bearing capacity for enough giving full play to Rock And Soil itself is widely used in mine construction and underground chamber construction.
The anchor pole wide variety applied in mine and geotechnical engineering at present, and respectively have its advantage and disadvantage.Wherein, overall length is viscous Knot anchor pole can effectively provide anchor force when any point deforms in anchoring range, while also have certain shearing resistance Ability, but certain allowing can not be provided and press distance, it is not suitable for large deformation surrounding rock supporting, while realizing entirely using grouting method Long to bond, construction is complicated, and the period is long;Large deformation anchor rod can ensure to allow when large deformation occurs in tunnel simultaneously presses distance and supporting Resistance effectively safeguards the stability of large deformation country rock, but limited to the support capacity of weak broken wall rock, and the body of rod is also easy production Raw corrosion failure;Prestressed anchor can effectively control back sinking, reduce surrounding rock separation layer and sliding, improve the steady of tunnel It is qualitative, it can be difficult to country rock is allowed to generate certain deformation, it is not suitable for large deformation surrounding rock supporting.
Such as:Chinese invention patent CN105715287A discloses a kind of combination Self-propelling grouting anchoring-bolt, exists in the anchor pole Anchor head and hollow grouting anchor body process multiple injected holes, and barb-like screw thread is arranged to increase on hollow grouting anchor body front bar surface Add anchor force.But the body of rod processes multiple injected holes, reduces lever strength;In addition, it is difficult to which country rock is allowed to generate certain become Shape is not suitable for large deformation surrounding rock supporting;Meanwhile full length fastening is realized using grouting mode, complicated for operation, time-consuming.
Chinese utility model patent CN203230446U discloses a kind of swollen shell-type prestressing force coal mine energy-absorbing support anchor rod, should Anchor pole has stronger deformability, is suitable for high stress large deformation rock mass coal mine by the way that wave energy-absorbing section bent stick is arranged.But It is that the body of rod is easy to be corroded by substances such as water, reduces anchor rod body intensity, shortens the service life of anchor pole.
Chinese invention patent CN102808635A discloses a kind of swollen shell-type Inner bolt head prestressed anchor and its installs and uses Method, which is provided with cone core and the swollen shell of pyramidal structure in Inner bolt head and cone angle is identical, is provided on swollen shell symmetrical logical Slot, when use, can significantly improve the prestressing force that anchor-holding force of anchor bolt and anchor pole can apply with the swollen shell of spreading.But the body of rod holds Easily corroded by substances such as water, causes corrosion failure;In addition, it is difficult to allow compressive strain, it is not suitable for large deformation surrounding rock supporting.
The pros and cons that above-mentioned anchor pole respectively has, it should develop a kind of novel anchor rod effectively combining this three classes anchor pole advantage, reach There is the purpose of large deformation country rock in more preferable supporting.
Invention content
Large deformation is bonded the purpose of the present invention is providing a kind of overall length simple in structure in conjunction with a variety of anchor pole advantages and allows pressure anchor Bar can form certain prestressing force after the rockbolt installation, and provide it is larger allow pressure distance and continuous work resistance, can effectively keep The stability of large deformation breaking surrounding rock avoids the generation of roof fall accident.
The construction that overall length of the present invention bonds large deformation pressure-relieving achor bar is:By expansion anchorage head, the body of rod, corrugated sleeve, pallet It is formed with damping nut;The expansion anchorage head is the hollow cylinder that inwall processing has coarse-pitch thread, using circumferential groove as boundary It is divided into expandable portion and non-enlarged portion;The rod end is machined with the external screw thread being connect with expansion anchorage head, tail portion setting There is increasing resistance head;The corrugated sleeve includes clamp, bellows segment and flat segments, and the outer sunk part of bellows segment is filled out by rubber deformation layer It fills, sleeve flat segments are arranged external screw thread and install pallet and damping nut;Before installing anchor pole, the body of rod should be assembled first with sleeve.
Pressure resistance and frictional resistance moment, the increasing resistance head of body of rod tail portion is allowed to pass through plunging to be formed on body of rod increasing resistance head point Or temperature differential method carries out interference with corrugated sleeve and connect, and increasing resistance head is made just to contact corrugated sleeve bellows segment.
In order to avoid the substance for causing the body of rod to corrode enters inside corrugated sleeve, using marine glue or grout off radiation fins Cylinder flat segments end.
To make main rod body more preferably enter anchorage head expandable portion, the expansion anchorage head is machined at the top of not enlarged portion Four rectangular notches;Processing has the gap among expandable portion, each two groove.
It is more preferable to realize that overall length bonds in order to ensure that the slow setting resin into anchorage head cavity flows back into anchor hole, in expansion anchor Gu the head whole body is equipped with four symmetrical vertical grooves.
In order to more preferably apply prestressing force, the body of rod external thread section length is identical as anchorage head expandable portion, diameter Less than main rod body diameter, with 45 ° of cone angle transition and linkages of main rod body, the sum of main rod body radius and expansion anchorage head wall thickness are more than anchor hole Radius;After main rod body rotates into anchorage head expandable portion, make to be arranged in every gap of anchorage head expandable portion and groove Between continuous hangnail piece be close to anchor hole wall, larger anchor force is provided.
In order to avoid binder enters inside corrugated sleeve, the gap between the corrugated sleeve clamp and the body of rod uses Low-intensity glue blocks.
To make well adapting to property of the present invention, the corrugated segment length is that maximum allows pressure amount, can be according to difference The suitable length of project situation processing;Pressure resistance is allowed in addition, changing corrugated sleeve wall thickness and can adjust, it can be according to live practical spirit Selection sleeve wall thickness living.
The construction method that overall length of the present invention bonds large deformation pressure-relieving achor bar is:It, first will expansion anchorage head, enough when construction Slow setting resin explosive roll is sequentially placed into anchor hole;Then, the body of rod being completed and corrugated sleeve are inserted into anchor hole, flat segments successively Pallet, damping nut are installed;Then, damping nut is connect with Pneumatic anchor rod fitting machine, damping due to rotation nut drives the body of rod to turn It is dynamic, stirring powder stick is squeezed, so that slow setting resin is diffused in anchor hole, adhesive layer is formed between anchor pole and anchor hole wall;When the body of rod connects When touching anchorage head, anchorage head generates frictional force by rectangular notch and anchor hole floor rocks, can phase between the body of rod and anchorage head To rotation;While body of rod external thread section enters anchorage head not expandable portion, main rod body, which just starts spreading anchorage head, to expand The portion of opening, hangnail piece are close to anchor hole inner wall, form anchor force;Finally, when the body of rod is rotated to expansion anchorage head bottom, torque starts to increase Greatly, after increasing to a certain extent, damping plug falls off, and damping nut is relatively rotated with the body of rod;It is rotated further nut, nut pressure Tight pallet applies prestressing force simultaneously, and prestressing force size should be less than corrugated sleeve and increase the pressure resistance that allows between hindering head.
Overall length of the present invention bonds the working deformation principle of large deformation pressure-relieving achor bar:After rockbolt installation, with country rock Deformation, when active force be more than increase resistance head and corrugated sleeve between allow pressure resistance when, increase resistance head start phase occur with corrugated sleeve To sliding;After increasing resistance head enters corrugated section, bellows segment inner wall is squeezed, rubber deformation layer is compressed, and bellows segment is with country rock Deformation gradually with bond layer separation;It can control by using the corrugated sleeve of different wall thickness and allow pressure resistance;It is slided when increasing resistance head To sleeve ends, increasing resistance head can not continue to slide under the action of sleeve ends clamp, reach the maximum allowable pressure amount that allows at this time;It can According to actual conditions, the length of corrugated sleeve bellows segment is designed, controls the maximum allowable deflection of country rock.
Overall length of the present invention, which bonds the advantages of large deformation pressure-relieving achor bar, is:
(1)Anchor bar body and water etc. easily cause the substance isolation of corrosion, avoid causing lever strength to decline because of corrosion, extend anchor pole Service life;In addition, anchor rod pallet board is only subjected to the loosening force of part rock mass, and compared with part adhesive or end-fixed bolter, pallet The power being subjected to can be much smaller;
(2)Realize that overall length bonds by slow setting resin explosive roll, more effortless compared with grouted anchor bar, operation is more convenient;In addition, Using slow setting resin material, compared to cement mortar, the time for forming enough cohesive forces is also shorter;
(3)Anchorage head periphery hangnail piece can be close to anchor hole inner wall, form larger just anchor-hold and improve branch convenient for applying prestressing force Protect effect;
(4)Corrugated sleeve bellows segment can be gradually disengaged during surrouding rock deformation with adhesive layer, be bonded compared to traditional overall length Class anchor pole, the present invention can realize in the state that overall length bonds allows compressive strain, effectively combines whole-length cohesive anchor bolt and large deformation The advantages of anchor pole;
(5)Increase between resistance head and corrugated sleeve there are frictional resistance, when the active force that surrouding rock deformation generates is more than frictional resistance, two It will appear relative motion between person, discharge country rock internal energy, avoid body of rod stress in country rock small deformation excessive and be broken;
(6)Corrugated section evagination top metal part is contacted with adhesive layer, since rubber material is less than what metal material transmitted Cohesive force, although corrugated sleeve diameter is big, the cohesive force provided is smaller than the mobile jib body portion for stretching out sleeve;Therefore, bellows segment There is partial metallic contact, helps to reduce the bonding gap edge between the body of rod and sleeve.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the corrugated sleeve schematic diagram of the present invention.
Fig. 3 is the expansion anchorage head side schematic three dimensional views of the present invention.
Marginal data:1- damping nuts;2- damping plugs;3- pallets;4- increases resistance head;5- rubber deformation layers;6- corrugated sleeves; The 7- bodies of rod;8- expands anchorage head;9- adhesive layers;10- flat segments;11- bellows segments;12- clamps;13- main rod bodies;14- hangnail pieces; 15- rectangular notches;The gaps 16-;17- vertical grooves;18- circumferential grooves;19- not enlarged portions;20- expandable portions.
Specific implementation mode
The present invention provides a kind of overall length bonding large deformation pressure-relieving achor bar, to make the purpose of the present invention, technical solution and effect It is clearer, clear, the specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.
Overall length as shown in Figure 1 bonds large deformation pressure-relieving achor bar by expansion anchorage head 8, the body of rod 7, corrugated sleeve 6, pallet 3 It is formed with damping nut 1.The expansion anchorage head 8 is the hollow cylinder that inwall processing has coarse-pitch thread, and cylinder outer diameter is slightly smaller In anchor hole diameter, the circumferential groove 18 that is arranged by surface is divided for expandable portion 20 and not enlarged portion 19;Cylinder whole body design four Symmetrical vertical groove 17, main function are that the slow setting resin resided in expansion anchorage head 8 is made to be back to anchor hole;Do not expand Rectangular notch 15 is arranged in 19 top of the portion of opening, and so that expansion anchorage head 8 is generated certain frictional force with anchor hole floor rocks, the body of rod 7 can It is relatively rotated with anchorage head 8,19 length of enlarged portion is not 20mm~30mm for setting, mainly for ensureing enough anchor forces;It can 20 length of enlarged portion should be not less than not enlarged portion 19, and setting 20 length of expandable portion is 40mm~60mm, in expandable portion 20, often Gap 16 is set among two vertical grooves 17, several hangnail pieces 14 are set between every gap 16 and vertical groove 17, make master The body of rod 13 is easier to enter anchorage head expandable portion 20(See Fig. 3).
Anchor rod body 7 is solid metal, and end is machined with the external screw thread to match with expansion 8 coarse-pitch thread of anchorage head, outside Reach is consistent with expandable portion 20;Main rod body 13, by 45 ° of cone angle transition and linkages, has a diameter larger than outer with male thread portion Threaded portion, the sum of 13 radius of main rod body and expansion 8 wall thickness of anchorage head are more than anchor hole radius, when 7 male thread portion of the body of rod rotates Into anchorage head not enlarged portion 19 when, main rod body 13 expands anchorage head 8, hangnail just into anchorage head not enlarged portion 20, spreading Piece 14 is close to anchor hole wall, provides larger anchor force, applies prestressing force convenient for the later stage;Tail portion setting increases resistance head 4, and diameter is slightly larger than Sleeve flat segments internal diameter;Increase resistance head 4 to connect with the progress interference of corrugated sleeve 6 by plunging or temperature differential method, makes increasing resistance head 4 just Contact 6 bellows segment 11 of corrugated sleeve, main function is to allow pressure resistance and frictional resistance to increase resistance head 4 part in the body of rod 7 and formed Square.
Anchor pole corrugated sleeve 6 includes clamp 12, bellows segment 11 and flat segments 10, and wherein clamp 12 is arranged in sleeve ends, It can prevent the body of rod 7 from completely disengaging sleeve;11 outer sunk part of bellows segment is filled and led up by rubber deformation layer 5, can allow for bellows segment 11 are deformed, and realization is progressively disengaged with binder, and the length of main allow presses distance, can add according to different project situations The suitable length of work, such as:In coal mine roadway with large deformation, rock deformation can be set up to 500~600mm, 11 length of bellows segment It is set to 600mm;External screw thread is arranged in flat segments 10, for installing damping nut 1(See Fig. 2);In the assembling body of rod 7 and corrugated sleeve 6 When, using 10 end of marine glue or 6 flat segments of grout off corrugated sleeve, main function is the object for avoiding that the body of rod 7 is caused to corrode Matter enters inside corrugated sleeve 6;In addition, the change of 6 wall thickness of corrugated sleeve can adjust and allow pressure resistance size, it can be according to practical work Condition flexibly selects sleeve wall thickness.Pallet 3 and damping nut 1 are mounted on 6 flat segments 10 of corrugated sleeve, and 1 tail portion of damping nut is equipped with Damping plug 2, main function are to make corrugated sleeve 6 and damping nut 1 under certain torque without relative rotation.
When construction, expansion anchorage head 8, enough slow setting resin explosive rolls are first sequentially placed into anchor hole;Then, it will be completed The body of rod 7 and corrugated sleeve 6 be inserted into anchor hole, pallet 3, damping nut 1 are installed successively in flat segments 10;Then, by damping nut 1 It is connect with Pneumatic anchor rod fitting machine, damping due to rotation nut 1 drives the body of rod 7 to rotate, and squeezes stirring powder stick, slow setting resin is made to diffuse to In anchor hole, adhesive layer 9 is formed between anchor pole and anchor hole wall;When the body of rod 7 contacts expansion anchorage head 8, anchorage head 8 is at top Frictional force is generated with anchor hole floor rocks under the action of rectangular notch 15, can be relatively rotated between the body of rod 7 and anchorage head 8; 1 external thread section of the body of rod enter anchorage head not enlarged portion 19 while, main rod body 13 just starts spreading anchorage head expandable portion 20, Hangnail piece 14 is close to anchor hole inner wall, forms anchor force;Finally, when the rotation of the body of rod 7 is to 8 bottom of expansion anchorage head, torque starts to increase Greatly, after increasing to a certain extent, damping plug 2 falls off, and damping nut 1 is relatively rotated with the body of rod 7;It is rotated further nut 1, is pressed Tight pallet 3 applies prestressing force simultaneously, and prestressing force size should be less than corrugated sleeve 6 and increase the pressure resistance that allows between hindering head 4.

Claims (6)

1. a kind of overall length bonds large deformation pressure-relieving achor bar, main includes expansion anchorage head, the body of rod, corrugated sleeve, pallet and damping Nut;The expansion anchorage head is the hollow cylinder that inwall processing has coarse-pitch thread, is divided into using circumferential groove as boundary expansible Portion and non-enlarged portion;The rod end is machined with the external screw thread to match with expansion anchorage head coarse-pitch thread, and tail portion is provided with Increase resistance head;The corrugated sleeve includes clamp, bellows segment and flat segments, and the outer sunk part of bellows segment is filled out by rubber deformation layer It fills, flat segments are arranged external screw thread and install pallet and damping nut;Before installing anchor pole, the body of rod is first assembled with corrugated sleeve.
2. overall length as described in claim 1 bonds large deformation pressure-relieving achor bar, which is characterized in that the body of rod and corrugated sleeve Assembling process be:The increasing of body of rod tail portion is first hindered head to connect with corrugated sleeve progress interference by plunging or temperature differential method, is made Increase resistance head and just contact corrugated sleeve bellows segment, then uses marine glue or grout off corrugated sleeve flat segments end.
3. overall length as described in claim 1 bonds large deformation pressure-relieving achor bar, which is characterized in that the expansion anchorage head whole body Equipped with four symmetrical vertical grooves;There are four rectangular notches for processing at the top of not enlarged portion;In expandable portion, each two groove Centre processing has the gap, and continuous hangnail piece is arranged between every gap and groove.
4. overall length as described in claim 1 bonds large deformation pressure-relieving achor bar, which is characterized in that the body of rod external screw thread segment length Degree is identical as anchorage head expandable portion, and diameter is less than main rod body diameter, with 45 ° of cone angle transition and linkages of main rod body;Main rod body half The sum of diameter and expansion anchorage head wall thickness are more than anchor hole radius.
5. overall length as described in claim 1 bonds large deformation pressure-relieving achor bar, which is characterized in that the corrugated sleeve clamp with Gap between the body of rod is blocked using low-intensity glue;Corrugated segment length is that maximum allows pressure amount, can be according to different project situations The suitable length of processing;Pressure resistance is allowed in addition, changing corrugated sleeve wall thickness and can adjust, it can be according to live practical flexibly selection set Barrel is thick.
6. a kind of overall length according to any one of claims 1 to 5 bonds the construction method of large deformation pressure-relieving achor bar, which is characterized in that When construction, expansion anchorage head, enough slow setting resin explosive rolls are first sequentially placed into anchor hole;Then, by the body of rod being completed and Corrugated sleeve is inserted into anchor hole, and pallet, damping nut are installed successively in sleeve flat segments;Then, by damping nut and Pneumatic anchor rod Fitting machine connects, and damping due to rotation nut drives body of rod rotation, squeezes stirring powder stick, so that solidifying resin medicine is diffused in anchor hole, in anchor Adhesive layer is formed between bar and anchor hole wall;When the body of rod contacts anchorage head, anchorage head can be with anchor hole bottom by rectangular notch Rock generates frictional force, can be relatively rotated between the body of rod and anchorage head;It is not expansible to enter anchorage head in body of rod external thread section While portion, main rod body just starts spreading anchorage head expandable portion, and hangnail piece is made to be close to anchor hole inner wall, forms anchor force;Most Afterwards, when the body of rod is rotated to expansion anchorage head bottom, torque increases, and after increasing to a certain extent, damping plug falls off, damping nut It is relatively rotated with the body of rod;It is rotated further nut, pallet can be compressed while applying prestressing force, prestressing force size should be less than wave Line sleeve and increases and allow pressure resistance between resistance head.
CN201810468330.1A 2018-05-16 2018-05-16 Overall length bonds large deformation pressure-relieving achor bar and its construction method Pending CN108343458A (en)

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Application Number Priority Date Filing Date Title
CN201810468330.1A CN108343458A (en) 2018-05-16 2018-05-16 Overall length bonds large deformation pressure-relieving achor bar and its construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810468330.1A CN108343458A (en) 2018-05-16 2018-05-16 Overall length bonds large deformation pressure-relieving achor bar and its construction method

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Publication Number Publication Date
CN108343458A true CN108343458A (en) 2018-07-31

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110578542A (en) * 2019-09-19 2019-12-17 中国矿业大学 High-stress rock burst roadway anchor rod, design method and working method
CN113356909A (en) * 2021-08-11 2021-09-07 徐州祥瑞工程机械科技有限公司 Mining slip casting stock

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110578542A (en) * 2019-09-19 2019-12-17 中国矿业大学 High-stress rock burst roadway anchor rod, design method and working method
CN110578542B (en) * 2019-09-19 2020-09-08 中国矿业大学 High-stress rock burst roadway anchor rod, design method and working method
CN113356909A (en) * 2021-08-11 2021-09-07 徐州祥瑞工程机械科技有限公司 Mining slip casting stock

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