CN108104852A - A kind of low stretch-draw anchor construction method for reducing loss of prestress - Google Patents
A kind of low stretch-draw anchor construction method for reducing loss of prestress Download PDFInfo
- Publication number
- CN108104852A CN108104852A CN201711363479.5A CN201711363479A CN108104852A CN 108104852 A CN108104852 A CN 108104852A CN 201711363479 A CN201711363479 A CN 201711363479A CN 108104852 A CN108104852 A CN 108104852A
- Authority
- CN
- China
- Prior art keywords
- anchor
- agent
- anchor agent
- ultrafast
- slow speed
- 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.)
- Granted
Links
- 238000010276 construction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 230000036316 preload Effects 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 description 58
- 241001568665 Ocinebrellus inornatus Species 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A kind of low stretch-draw anchor construction method for reducing loss of prestress, suitable for mine and geotechnical engineering.Using anchor cable by Anchor Agent according to ultrafast Anchor Agent preceding, the posterior order of Anchor Agent is headed into drilling completely at a slow speed, is sufficiently stirred, and is stood after ultrafast Anchor Agent is fully cured, and tensioning is carried out using stretch-draw jack and anchorage, and protects load a period of time, and tensioning is completed.The process not yet starts to cure preceding completion in Anchor Agent at a slow speed.Most long in stretching process free section of anchor cable, loss of prestress ratio caused by the intermediate plate retraction of anchorage is minimum；It protects to carry and can eliminate the loss of prestress caused by anchoring body front end takes off glutinous sliding.The problems such as ultra stretching load of this method is low, avoids tensioner high loaded process, and anchor cable steel strand wires stock is broken.
Description
Technical field
It is especially a kind of to be adapted to mine and the reduction of geotechnical engineering in advance the present invention relates to construction prestressed cable technology
The low stretch-draw anchor construction method of power loss.
Background technology
In infrastructure construction, usually constructed using anchor cable instead of traditional anchor pole.Compared to traditional anchor pole, anchor
From the limitation of construction space, intensity is far above anchor rod strength, can bear more big load the flexible flexible, length of rigging, sharp
It can apply the advantages that more high-prestressed with stretch-draw jack and clip type lockset.So that anchor cable is used widely.
Since anchor cable is using stretch-draw jack and strand tapered anchorage application prestressing force, inevitably occur because in anchorage
Intermediate plate retraction causes anchor cable to bounce back, and causes loss of prestress；Simultaneously in order to ensure high anchor force, anchorage length often beyond 2m,
Free section of anchor cable is shorter, and elongation is smaller, and loss of prestress caused by causing anchor cable retraction is huge, at maximum up to 40%-50%；
It anchoring section front end also can the loss of prestress caused by sliding de- stick.
The prior art generally uses the mode of ultra stretching, i.e., is offset the loss by improving stretching force so that lifting jack unloading
Residual stress afterwards disclosure satisfy that design requirement.But this method needs to apply nearly 2 times of design pretightning force in tensioning,
Machine drawing tool can due to high loaded process the service life die-off, anchor cable steel strand wires stock can because high prestress damage even be broken, the construction time
Also can it rise with difficulty.Still lack a kind of anchor cable construction method for reducing loss of prestress in stretching process at present.
The content of the invention
Technical problem：The purpose of the present invention is overcoming the shortcomings of in prior art, a kind of reduction loss of prestress is provided
Low stretch-draw anchor construction method.
Technical solution：The low stretch-draw anchor construction method of the reduction loss of prestress of the present invention, its step are as follows：
A. drill according to the size of anchor cable in wall；
B. according to ultrafast Anchor Agent preceding, the posterior order of Anchor Agent fills in drilling at a slow speed, and using anchor cable by ultrafast anchor
Gu agent and at a slow speed Anchor Agent head into drilling, poked after ultrafast Anchor Agent and at a slow speed Anchor Agent are headed into drilling bottom by anchor cable ultrafast
Anchor Agent and at a slow speed Anchor Agent blend ultrafast Anchor Agent and the at a slow speed packaging of Anchor Agent using anchor cable and are stirred, wherein super
Fast Anchor Agent and the at a slow speed interface of Anchor Agent nearby have minimum one section and generate mixing but do not influence actual effect, stand anchor
Ultrafast Anchor Agent is fully cured in rope；
C. the part installation strand tapered anchorage outside anchor cable drilling props up wall, coordinates clip type using stretch-draw jack
Anchorage carries out tensioning preload and the standard stretching force of maintenance to anchor cable and carries out guarantor's load, ultrafast Anchor Agent solidification at this time and by anchor cable top
Part is anchored with the wall of a borehole, and when tensioning, ultrafast Anchor Agent solidification portion outboard was gradually opened with the wall of a borehole, and anchor at a slow speed at this time
Gu agent is not solidified also still for fluidised form, become de- glutinous sliding, cause anchor cable relaxation pretightning force loss；
E. jack release is controlled, terminates to protect load process, completes the installation of anchor cable, Anchor Agent curing at a slow speed is waited, completes
The construction of anchor cable.
Ultrafast Anchor Agent size only needs to meet design pretightning force requirement, and it is common to meet two section Anchor Agents for Anchor Agent size at a slow speed
The anchor force of generation meets design pulling capacity requirement, and ultrafast Anchor Agent length is often the 1/5 of anchor cable length, at a slow speed Anchor Agent length
For the 1/5-3/5 of the anchor cable body of rod).
The tensioning and guarantor's load process start to cure preceding completion in Anchor Agent at a slow speed, wherein it is 30s-1min to wrap in the time.
The beginning hardening time of the Anchor Agent at a slow speed is much larger than the ultrafast Anchor Agent model Cka of ultrafast Anchor Agent, coagulates
The glue time is 8-25s, and Anchor Agent model M, gel time are at a slow speed>180s.
The standard stretching force load is design pretightning force and the summation of anchor cable retraction lost force
Advantageous effect：By adopting the above-described technical solution, the present invention has the following advantages that compared with prior art：
(1) stretching force additionally applied is needed during ultra stretching, and much smaller than traditional construction method, stretch-draw jack tool is subjected to
Load it is small, the tensioning time shortens, and mechanical service life extends, and anchor cable stress during tensioning is smaller, and steel strand wires stock is not easily broken
It splits.
(2) compared with the construction method of tensioning again is fully cured in resin anchoring agent, stretching process stream line of the invention is non-
Anchoring section is most long, anchor cable under the conditions of equal prestressing force along stretch it is longer, after stretch-draw jack release because anchor cable retraction generate it is pre-
Stress loss smaller.
(3) protected in stretching process and carry removal jack again after a period of time, can eliminated and be made because anchoring section front end takes off glutinous sliding
Into loss of prestress.
(4) slow resin anchoring agent cures in the case where anchor cable is in pre-stressed state, is equivalent to prestress anchoraging, is more advantageous to
Firm coal and rock.
Description of the drawings
Fig. 1 is the low stretch-draw anchor construction method schematic diagram of the present invention.
In figure：The ultrafast Anchor Agents of 1-, 2- Anchor Agents at a slow speed, 3- anchor cables, 4- strand tapered anchorages.
Specific embodiment
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings：
As shown in Figure 1, the low stretch-draw anchor construction method of the reduction loss of prestress of the present invention, its step are as follows：
A. drill according to the size of anchor cable 3 in wall；
B. according to ultrafast Anchor Agent 1 preceding, 2 posterior order of Anchor Agent fills in drilling, Anchor Agent 2 at a slow speed at a slow speed
Beginning hardening time much larger than ultrafast 1 ultrafast 1 model Cka of Anchor Agent of Anchor Agent, gel time 8-25s is anchored at a slow speed
2 model M of agent, gel time are>180s, ultrafast 1 size of Anchor Agent only need to meet design pretightning force requirement, at a slow speed Anchor Agent 2
Size meets the anchor force that two section Anchor Agents generate jointly and meets design pulling capacity requirement, and ultrafast 1 length of Anchor Agent is often anchor cable
The 1/5 of length, 2 length of Anchor Agent is the 1/5-3/5 of 3 body of rod of anchor cable at a slow speed, using anchor cable 3 by ultrafast Anchor Agent 1 and anchor at a slow speed
Gu agent 2 heads into drilling, ultrafast Anchor Agent 1 is poked after ultrafast Anchor Agent 1 and at a slow speed Anchor Agent 2 are headed into drilling bottom by anchor cable 3
Anchor Agent 2 at a slow speed blend ultrafast Anchor Agent 1 and the at a slow speed packaging of Anchor Agent 2 using anchor cable 3 and are stirred, wherein ultrafast
Anchor Agent 1 and the at a slow speed interface of Anchor Agent 2 nearby have minimum one section and generate mixing but do not influence actual effect, stand anchor
Ultrafast Anchor Agent 1 is fully cured in rope 3；
C. the part installation strand tapered anchorage 4 outside the drilling of anchor cable 3 props up wall, coordinates intermediate plate using stretch-draw jack
Formula anchorage 4 carries out anchor cable 3 tensioning preload and the standard stretching force of maintenance carries out guarantor's load, and the standard stretching force load is design
Pretightning force and anchor cable 3 bounce back the summation of lost force, and ultrafast Anchor Agent 1 solidifies and by 3 tip portion of anchor cable and the wall of a borehole anchor at this time
Gu tensioning and protecting load process and starting to cure preceding completion in Anchor Agent 2 at a slow speed, wherein it is 30s-1min to wrap in the time, when tensioning, surpasses
Fast Anchor Agent 1 solidifies portion outboard and is gradually opened with the wall of a borehole, and it is still fluidised form that Anchor Agent 2, which does not solidify also, at a slow speed at this time, into
For de- glutinous sliding, anchor cable relaxation pretightning force loss is caused；
E. jack release is controlled, terminates to protect load process, completes the installation of anchor cable 3, Anchor Agent 2 cures at a slow speed for wait, complete
Into the construction of anchor cable 3.
Technical scheme is disclosed as above by alternative embodiment.Artisan will appreciate that it is not taking off
That is made in the case of from the revealed scope and spirit of the present invention of appended claims of the invention changes and retouches, and belongs to
Within the scope of the claims of the present invention.
Claims (5)
1. a kind of low stretch-draw anchor construction method for reducing loss of prestress, it is characterized in that step is as follows：
A. according to anchor cable（3）Size drill in wall；
B. according to ultrafast Anchor Agent（1）Preceding, Anchor Agent at a slow speed（2）Posterior order fills in drilling, and uses anchor cable（3）It will be super
Fast Anchor Agent（1）Anchor Agent at a slow speed（2）Drilling is headed into, treats anchor cable（3）By ultrafast Anchor Agent（1）Anchor Agent at a slow speed（2）Top
Ultrafast Anchor Agent is poked after entering the bottom that drills（1）Anchor Agent at a slow speed（2）, utilize anchor cable（3）Blend ultrafast Anchor Agent（1）With it is slow
Fast Anchor Agent（2）Packaging and be stirred, wherein ultrafast Anchor Agent（1）Anchor Agent at a slow speed（2）Interface nearby have
Minimum one section generates mixing but does not influence actual effect, stands anchor cable（3）, make ultrafast Anchor Agent（1）It is fully cured；
C. in anchor cable（3）Part installation strand tapered anchorage outside drilling（4）Wall is propped up, coordinates intermediate plate using stretch-draw jack
Formula anchorage（4）To anchor cable（3）It carries out tensioning preload and the standard stretching force of maintenance carries out guarantor's load, at this time ultrafast Anchor Agent（1）Solidification
And by anchor cable（3）Tip portion and the wall of a borehole anchor, ultrafast Anchor Agent during tensioning（1）Solidify portion outboard and the wall of a borehole gradually quilt
It pulls open, and Anchor Agent at a slow speed at this time（2）It does not solidify also still for fluidised form, becomes de- glutinous sliding, cause anchor cable relaxation pretightning force loss；
E. jack release is controlled, terminates to protect load process, completes anchor cable（3）Installation, wait Anchor Agent at a slow speed（2）Cure, it is complete
Into anchor cable（3）Construction.
2. the low stretch-draw anchor construction method according to claim 1 for reducing loss of prestress, it is characterized in that：Described is super
Fast Anchor Agent（1）Size only needs to meet design pretightning force requirement, at a slow speed Anchor Agent（2）Size meets two section Anchor Agents and generates jointly
Anchor force meet design pulling capacity requirement, ultrafast Anchor Agent（1）Length is often the 1/5 of anchor cable length, at a slow speed Anchor Agent（2）It is long
It spends for anchor cable（3）The 1/5-3/5 of the body of rod）.
3. the low stretch-draw anchor construction method according to claim 1 for reducing loss of prestress, it is characterized in that：The tensioning
With guarantor's load process in Anchor Agent at a slow speed（2）Start to cure preceding completion, wherein it is 30s-1min to wrap in the time.
4. the anchor cable construction method of low stretch-draw prestressing force loss according to claim 1, it is characterized in that：The anchor at a slow speed
Gu agent（2）Beginning hardening time be much larger than ultrafast Anchor Agent（1）Ultrafast Anchor Agent（1）Model Cka, gel time 8-
25s, at a slow speed Anchor Agent（2）Model M, gel time are>180s.
5. the anchor cable construction method of low stretch-draw prestressing force loss according to claim 1, it is characterized in that：The standard
Drag load is design pretightning force and anchor cable（3）The summation for the lost force that bounces back.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711363479.5A CN108104852B (en) | 2017-12-18 | 2017-12-18 | A kind of low stretch-draw anchor construction method reducing loss of prestress |
| PCT/CN2018/105355 WO2019119900A1 (en) | 2017-12-18 | 2018-09-13 | Low-tension anchor cable construction method capable of reducing prestress loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711363479.5A CN108104852B (en) | 2017-12-18 | 2017-12-18 | A kind of low stretch-draw anchor construction method reducing loss of prestress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108104852A true CN108104852A (en) | 2018-06-01 |
| CN108104852B CN108104852B (en) | 2019-05-14 |
Family
ID=62209868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711363479.5A Active CN108104852B (en) | 2017-12-18 | 2017-12-18 | A kind of low stretch-draw anchor construction method reducing loss of prestress |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108104852B (en) |
| WO (1) | WO2019119900A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019119900A1 (en) * | 2017-12-18 | 2019-06-27 | 中国矿业大学 | Low-tension anchor cable construction method capable of reducing prestress loss |
| CN113529705A (en) * | 2021-07-21 | 2021-10-22 | 中国矿业大学(北京) | High-prestress nondestructive application device and method for anchor rods and anchor cables |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062248B (en) * | 2021-11-02 | 2022-09-13 | 西南交通大学 | System and method for testing friction resistance value of free section of rock-soil anchor cable pipeline |
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| CN101413396A (en) * | 2008-09-26 | 2009-04-22 | 中国水利水电第十四工程局有限公司 | Injecting and mounting method of stretching anchor rod |
| CN102116162A (en) * | 2011-03-25 | 2011-07-06 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Tension dispersed anchor cable for coal mine and anchoring method thereof |
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| CN104153801A (en) * | 2014-08-29 | 2014-11-19 | 河南理工大学 | Method for automatic, rapid and damage-free application of high pretightening force to mining anchor rod |
| CN105370303A (en) * | 2015-11-26 | 2016-03-02 | 湖南科技大学 | Tensioning device for deep roadway high-prestress anchor bolt support and operation method thereof |
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| DE102011078769A1 (en) * | 2011-07-07 | 2013-01-10 | Hilti Aktiengesellschaft | rock bolt |
| CN102337912A (en) * | 2011-10-17 | 2012-02-01 | 新汶矿业集团有限责任公司华丰煤矿 | Rapid anchoring method for coal mine roadway anchor rod |
| CN105134267B (en) * | 2015-09-10 | 2017-08-01 | 河南理工大学 | A kind of anchorage cable anchoring synergisting method and its structure |
| CN205172610U (en) * | 2015-11-02 | 2016-04-20 | 新汶矿业集团有限责任公司协庄煤矿 | A stock anchor for tunnel country rock |
| CN108104852B (en) * | 2017-12-18 | 2019-05-14 | 中国矿业大学 | A kind of low stretch-draw anchor construction method reducing loss of prestress |
-
2017
- 2017-12-18 CN CN201711363479.5A patent/CN108104852B/en active Active
-
2018
- 2018-09-13 WO PCT/CN2018/105355 patent/WO2019119900A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413396A (en) * | 2008-09-26 | 2009-04-22 | 中国水利水电第十四工程局有限公司 | Injecting and mounting method of stretching anchor rod |
| CN102116162A (en) * | 2011-03-25 | 2011-07-06 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Tension dispersed anchor cable for coal mine and anchoring method thereof |
| CN103498690A (en) * | 2013-09-04 | 2014-01-08 | 中国矿业大学 | Double-anchor-cable combination locking device and method thereof |
| CN104153801A (en) * | 2014-08-29 | 2014-11-19 | 河南理工大学 | Method for automatic, rapid and damage-free application of high pretightening force to mining anchor rod |
| CN105370303A (en) * | 2015-11-26 | 2016-03-02 | 湖南科技大学 | Tensioning device for deep roadway high-prestress anchor bolt support and operation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019119900A1 (en) * | 2017-12-18 | 2019-06-27 | 中国矿业大学 | Low-tension anchor cable construction method capable of reducing prestress loss |
| CN113529705A (en) * | 2021-07-21 | 2021-10-22 | 中国矿业大学(北京) | High-prestress nondestructive application device and method for anchor rods and anchor cables |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019119900A1 (en) | 2019-06-27 |
| CN108104852B (en) | 2019-05-14 |
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