CN109778853A - Prestressed anchor injection forming construction method - Google Patents
Prestressed anchor injection forming construction method Download PDFInfo
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- CN109778853A CN109778853A CN201910174537.2A CN201910174537A CN109778853A CN 109778853 A CN109778853 A CN 109778853A CN 201910174537 A CN201910174537 A CN 201910174537A CN 109778853 A CN109778853 A CN 109778853A
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- anchor
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Abstract
The invention discloses a kind of molding construction methods of prestressed anchor once grouting.It include: that a little pore-creating, anchor hole cleaning are put in measurement, anchor hole is examined, and anchor pole, installation supporting plate, washer and nut, tensioning fixation are assigned in rapid solidification anchor agent and retarding mortar preparation, slip casting；Wherein slip casting is divided to two sections to complete using the disposable continuous grouting of a slip casting machine, is initially injected rapid solidification anchor agent, after infuse retarding mortar immediately；Grouting Pipe is slowly released using grouting pressure when slip casting, stops slip casting when being pushed into advance in ready-made label in Grouting Pipe.The present invention uses once grouting mode, technique is faster, conveniently, construction speed can be greatly speeded up, only need to after rockbolt installation 5h to 8h with regard to achievable anchor pole tensioning, only Grouting Pipe the direct slip casting in bolthole bottom need to be inserted into using once grouting construction can and slowly release with slip casting, and Grouting Pipe is reusable, technique is faster, cost is lower.
Description
Technical field
The invention belongs to hydraulic and hydroelectric engineering construction technique fields, especially belong to large-sized concrete structures support technology neck
Domain, and in particular to prestressed anchor injection forming construction technology.
Background technique
In the building course of large-sized concrete structures, it usually needs support anchoring construction is carried out, such as Large Underground hole
The excavation supporting of room.In prestressed anchor uncased using free segment, art methods are usually adopted for support anchoring construction
With secondary grouting technique.When first time slip casting, it is necessary to assure slip casting is filled in anchoring depth, but slurries must not flow into freedom
Section, after prestressed anchor stretch-draw anchor, then second is carried out to free segment and is in the milk.
In secondary grouting construction, for the anchorage length and slip casting plumpness of accurate control anchoring section, anchoring section need to be installed
The measures such as Grouting Pipe, return pipe, grout stop are constructed.According to " hydroelectric project prestress anchoraging design specification " DL/T5176's
It is required that the grade of compressive strength of the grouted part cementing material in the prestressed anchor body of rod is not lower than M35.It is tried according to scene
It tests.M35 mortar strength need to can be only achieved design strength 80% or so at 7 days or so, i.e., 7 talentes, which can be carried out, after anchoring section slip casting opens
It draws.
According to the requirement of " Technical code for shotcrete rock bolts shore " GB50086-2001, prestressed anchor tensioning fixation
48 domestic demands check prestressing force afterwards, if discovery loss of prestress is greater than the 10% of axis force of anchor design value, should be mended
Tensioning is repaid, is carrying out free segment grouting after qualification to be checked.Bolthole is blocked by backing plate at that time, need to fulfil free segment note ahead of schedule
Slurry pipe, return pipe it is pre-buried.
Therefore, it is constructed using secondary grouting, the entire prestressed anchor construction time about 9 days+48 hours about 7 days or so；It is secondary
The process of grouting process is more, long in time limit, and the discarded slurries that secondary grouting generates pollute environment, waste raw material, are unfavorable for environment
Protection.
Summary of the invention
Deficiency discloses a kind of molding construction method of prestressed anchor once grouting to the present invention according to prior art.This
Problems to be solved by the invention is to provide a kind of prestressed anchor injection forming construction method, and the method for the present invention can accelerate prestressing force
Anchor pole includes free segment without casing construction speed, while avoiding secondary grouting and discarding influence of the slurries to environment.
The invention is realized by the following technical scheme:
Prestressed anchor injection forming construction method, comprising the following steps: a little pore-creating, anchor hole cleaning, anchor hole inspection are put in measurement
It tests, anchor pole, installation supporting plate, washer and nut, tensioning fixation are assigned in rapid solidification anchor agent and retarding mortar preparation, slip casting；
The rapid solidification anchor agent and retarding mortar preparation are: progress retarding mortar mixing first, then carry out rapid solidification anchor agent
Mixing, mixing time restriction is in 5min；
The slip casting is: after the completion of rapid solidification anchor agent and retarding mortar preparation, graduated Grouting Pipe will be marked to insert immediately
Enter in hole to pumpback 5cm after bottom hole；Slip casting is divided to two sections to complete using the disposable continuous grouting of a slip casting machine, is initially injected rapid hardening
Anchor Agent, after infuse retarding mortar immediately；Grouting Pipe is slowly released using grouting pressure when slip casting, wait be pushed into advance in Grouting Pipe
Stop slip casting when upper ready-made label；
It is described to assign the anchor pole to be: carry out anchor pole after the completion of retarding mortar filling and assign, anchor pole assign before to silk mouth using twining
It is protected around adhesive tape；Anchor pole slowly, is evenly assigned to bottom hole, and blocking anchor hole with cement anchor after the completion prevents slurries from flowing out.
The installation supporting plate, washer and nut are to start to install Supporting plate for anchor, washer and nut after the completion of anchor pole is assigned；
It is required that supporting plate, washer and nut are vertical with anchor pole axis.
After the installation Supporting plate for anchor, washer and nut, carried out after rapid solidification anchor agent final set, and before retarding mortar initial set
The tensioning of anchor pole.Before the formal tensioning of presstressed reinforcing steel, 20% design tensile load is taken, to its pre- tensioning 1~2 time, makes Qi Gebu
Position contact is close；When the formal tensioning of presstressed reinforcing steel, it should be stretched to the 105%~110% of design load, then locked by specified value
It is fixed；After presstressed reinforcing steel locking in 48h, when loss of prestress is greater than the 10% of axis force of anchor design value, tensioning is compensated.
When the method for the present invention slip casting, the rapid solidification anchor agent of preparation is all put into slip casting machine slip casting aperture, Anchor Agent is complete
Covering slip casting aperture prevents air from entering, after rapid solidification anchor agent fully enters Grouting Pipe, immediately by the slow setting sand of prior mixing
Slurry, which is put into slip casting slot, to be started to infuse slow setting anchor mortar, and retarding mortar will be in rapid solidification anchor agent whole press-in hole.
The measurement, which is put, accurately makes hole location using a total station, and makes mark with red paint.
The pore-creating is less than 200mm using multi-arm drilling, control hole location deviation, and hole depth is not less than anchor rod effective length,
Hole depth 200mm is not larger than designed, bore angle deviation processed is less than 3 °.
The anchor hole cleaning is to rob flushing with high pressure geomantic omen after the completion of drilling, until there is no terminate punching after muddy water outflow
It washes, and is blown out water outside hole with high pressure air pressure gun.
Prestressed anchor once grouting molding construction method of the present invention, effectively accelerates prestressed anchor construction speed,
The construction time is saved, while avoiding secondary grouting and discarding influence of the slurries to environment；Present invention process changes molding construction
Process reduces the use of material and its corollary equipment in work progress, and technique is faster, cost is lower.
Compared with prior art, the beneficial effects of the present invention are:
Existing conventional " secondary grouting construction " technique needs 7 days or so just to can be carried out tensioning after anchor pole once grouting, and
It just can be carried out secondary grouting after 48h need to be waited again, complete whole prestressed anchor injection forming constructions and usually require 9 days or so.
The present invention uses once grouting mode, and technique is faster, conveniently, can greatly speed up construction speed；The present invention only need to be in anchor pole
5h to 8h completes whole prestressed anchor injection forming constructions and usually requires 54 hours left sides with regard to achievable anchor pole tensioning after installation
It is right.
Existing conventional " secondary grouting construction " technique is both needed to embedded Grouting Pipe and return pipe in free segment, anchor section section, and
Seal ring, the not reproducible utilization of all material need to be set between anchoring section and free segment.The present invention is applied using once grouting
Grouting Pipe need to be only inserted into the direct slip casting in bolthole bottom and can and slowly released with slip casting by work, and Grouting Pipe is reusable,
Technique is faster, cost is lower.
Detailed description of the invention
Fig. 1 is construction method flow diagram of the present invention；
Fig. 2 is bolt grouting shaping schematic view of the present invention；
Fig. 3 is existing secondary grouting shaping schematic view.
In figure, 1 is anchor hole, and 2 be anchor pole, and 3 be anchor hole backing plate, and 4 be hemispherical washer, and 5 be nut, and 6 be centering bracket, 7
It is retarding mortar, 8 be rapid solidification anchor agent, and 9 be anchoring return pipe, and 10 be anchoring section Grouting Pipe, and 11 be grout stop, and 12 be free segment
Grouting Pipe, 13 be free segment return pipe, and 14 be M35 mortar, and A is free segment, and B is anchoring section.
Specific embodiment
The present invention is further described With reference to embodiment, specific embodiment be to the principle of the invention into
One step explanation, does not limit the invention in any way, and same or like technology is protected without departing from the present invention with the present invention
Range.
In conjunction with attached drawing.
As illustrated in fig. 1 and 2, prestressed anchor injection forming construction method of the present invention, comprising the following steps:
(1) measurement is put a little, accurately makes hole location using total station, and make mark with red paint.
(2) pore-creating is drilled using multi-arm, and control hole location deviation is less than 200mm, and hole depth is not less than body of rod effective length,
Hole depth 200mm is not larger than designed, circumferentor controls bore angle deviation less than 3 °.
(3) anchor hole is cleared up, and robs flushing with high pressure geomantic omen after the completion of drilling, until there is no terminating to rinse after muddy water outflow,
Water is blown out outside hole with high pressure air pressure gun again.
(4) anchor hole is examined, and after anchor hole cleans out, carries out hole bit number.And the hole location to each hole, aperture, Kong Xiang, hole
Deep, hole cleanliness makes a record.
(5) it weighs, mix and stir, the match ratio of tests determined rapid solidification anchor agent, retarding mortar, anchoring section rapid solidification anchor agent is adopted
Anchor Agent can be made to reach higher consistency with the lower ratio of mud, be stacked to concentrate rapid solidification anchor agent in slip casting
Slip casting nozzle guarantees that accelerator can fully enter in Grouting Pipe, and does not mix with slow solidification anchor agent.To ensure mixing quality, institute
There are rapid solidification anchor agent, retarding mortar individually need to quantitatively carry out mix using small mechanical equipment.
(6) slip casting needs to carry out slip casting machine trial operation before slip casting, and with water lubrication pipeline.Grouting Pipe inserts in the hole part preferably
It is managed using hard PE, and in grout outlet position overstriking to pore size, convenient for pushing Grouting Pipe outward under slurry pressure, simultaneously
Graduated scale is carried out, in Grouting Pipe convenient for control grouting amount.
By pumpback 5cm after Grouting Pipe insertion bottom hole after Grouting Pipe insertion bolthole.Slip casting is divided to two sections of progress, has infused rapid hardening anchor
Gu retarding mortar is infused after agent immediately.Slip casting uses a disposable continuous grouting of slip casting machine.The good rapid hardening of mixing is anchored first
Agent is all put into slip casting machine slip casting aperture, and Anchor Agent, which is completely covered by slip casting aperture, prevents air from entering, to rapid solidification anchor agent whole
Into after Grouting Pipe, the retarding mortar of prior mixing is put into slip casting slot starts to infuse slow setting anchor mortar immediately, retarding mortar will
In rapid solidification anchor agent whole press-in hole, Grouting Pipe is slowly released using grouting pressure when slip casting, wait be pushed into advance in Grouting Pipe
Stop slip casting when upper ready-made label.
(8) anchor pole is assigned, anchor pole is carried out after the completion of retarding mortar filling and assigns, it is to prevent anchor pole from assigning that anchor pole, which is assigned preceding,
In journey due to silk mouth damage or pollute cause nut can not normal mounting, to silk mouth winding adhesive tape protect.
Anchor pole is assigned manually to be carried out using mechanical engagement, and worker before anchor pole is assigned to understand the hole in each hole to so as to one
Secondary property is smoothly inserted into.Anchor pole slowly, at the uniform velocity assign completion after with cut-and-dried cement anchor block anchor hole prevent slurry stream
Out.
(8) supporting plate, washer and nut are installed, after the completion of anchor pole is assigned, starts that Supporting plate for anchor, washer and nut are installed, adjusts
The Board position that puts one's child in a boarding nursery is allowed to vertical with anchor pole axis.When scar using washer be also difficult to leveling nut it is parallel with supporting plate when, use hammer
Local scar is cleared up, and smearing rapid solidification anchor agent is levelling in backing plate installation region.
(9) tensioning fixation carries out the tensioning of anchor pole after rapid solidification anchor agent final set, and before retarding mortar initial set.Prestressing force
Before the formal tensioning of muscle, 20% design tensile load should be taken, to its pre- tensioning 1~2 time, keeps its each location contacts close.It answers in advance
When the formal tensioning of power muscle, it should be stretched to the 105%~110% of design load, then locked by specified value.Presstressed reinforcing steel locking
Afterwards in 48h, if discovery loss of prestress is greater than the 10% of axis force of anchor design value, tensioning should be compensated.
Illustrate bolt grouting molding construction method of the present invention by taking the construction of some hydropower station prestressed anchor as an example below.
Prestressed anchor diameter of phi 32, L=9m, T=12t, anchoring section B long 350mm, free segment A long 550mm.Anchoring is applied
Steps are as follows for work:
1) it is determined by experiment the match ratio of rapid solidification anchor agent and retarding mortar, and determines rapid solidification anchor agent and retarding mortar
Initial set and final setting time.
Measure through test: the rapid solidification anchor agent presetting period is 39min, and compression strength reaches after final setting time 57min, 5h
23.4Mpa, age compression strength reaches 45Mpa within 28 day, meets the quality standard.The retarding mortar presetting period is 11h31min, eventually
The solidifying time is 17h28min.7 day age compression strength reaches 37.2Mpa, and age compression strength reaches 54Mpa within 28 day, meets matter
Amount standard.
2) single prestressed anchor is gone out to the demand of a variety of materials by Conversion Calculation, and material is carried out using weighing tool
The gage work of material.
3) the rapid solidification anchor agent presetting period is shorter, and consistency is higher, should carry out again speed after the completion of retarding mortar mixing
Solidifying Anchor Agent mixing, mixing time restriction is in 5min；
4) it needs that the hydraulic pressure in Grouting Pipe is compeled discharge with slurries before Grouting Pipe insertion bolthole, by slip casting after water discharge
Pipe is inserted into pumpback 5cm after bottom hole.Slip casting is divided to two sections of progress, infuses retarding mortar immediately after having infused rapid solidification anchor agent.Slip casting uses one
The disposable continuous grouting of platform slip casting machine.
The rapid solidification anchor agent of mixing is all put into slip casting machine slip casting aperture first, it is anti-that Anchor Agent is completely covered by slip casting aperture
Only air enters, and after rapid solidification anchor agent fully enters Grouting Pipe, the retarding mortar of prior mixing is put into slip casting slot immediately
Start to infuse slow setting anchor mortar, retarding mortar is by rapid solidification anchor agent whole press-in hole, using grouting pressure by Grouting Pipe when slip casting
It slowly releases, stops slip casting when being pushed into advance in ready-made label in Grouting Pipe.
5) retarding mortar filling is completed, immediately slowly, at the uniform velocity assign prestressed anchor, and with cut-and-dried cement anchor
Blocking anchor hole prevents slurries from flowing out.
When the intensity of anchor pole induration reaches the 80% of predetermined strength and after more than 20MPa, the tensioning of anchor pole just can be carried out
It locking, rapid solidification anchor agent intensity after 5h used in this example reaches 23.4Mpa, and retarding mortar is pre-hardening after 11h31min, because
This tensioning time is scheduled on slip casting and completes in 5~11 hours.
Claims (8)
1. prestressed anchor injection forming construction method, it is characterised in that the following steps are included: a little pore-creating is put in measurement, anchor hole is clear
Reason, anchor hole are examined, and anchor pole, installation supporting plate, washer and nut, tensioning lock are assigned in rapid solidification anchor agent and retarding mortar preparation, slip casting
It is fixed；
The rapid solidification anchor agent and retarding mortar preparation are: progress retarding mortar mixing first, then carry out rapid solidification anchor agent mixing,
Mixing time restriction is in 5min；
The slip casting is: after the completion of rapid solidification anchor agent and retarding mortar preparation, will mark graduated Grouting Pipe insertion hole immediately
It is interior to pumpback 5cm after bottom hole；Slip casting is divided to two sections to complete using the disposable continuous grouting of a slip casting machine, is initially injected rapid hardening anchoring
Agent, after infuse retarding mortar immediately；Grouting Pipe is slowly released when slip casting using grouting pressure, wait be pushed into advance in being done in Grouting Pipe
Stop slip casting when the label got well；
It is described to assign the anchor pole to be: carry out anchor pole after the completion of retarding mortar filling and assign, anchor pole assign before to silk mouth using winding glue
Band is protected；Anchor pole slowly, is evenly assigned to bottom hole, and blocking anchor hole with cement anchor after the completion prevents slurries from flowing out.
2. prestressed anchor injection forming construction method according to claim 1, it is characterised in that: the installation supporting plate,
Washer and nut are to start to install Supporting plate for anchor, washer and nut after the completion of anchor pole is assigned；It is required that supporting plate, washer and nut with
Anchor pole axis is vertical.
3. prestressed anchor injection forming construction method according to claim 2, it is characterised in that: installation Supporting plate for anchor,
After washer and nut, the tensioning of anchor pole is carried out after rapid solidification anchor agent final set, and before retarding mortar initial set.
4. prestressed anchor injection forming construction method according to claim 3, it is characterised in that: presstressed reinforcing steel is formally opened
Before drawing, 20% design tensile load is taken, to its pre- tensioning 1~2 time, keeps its each location contacts close；Presstressed reinforcing steel is formally opened
When drawing, it should be stretched to the 105%~110% of design load, then locked by specified value；After presstressed reinforcing steel locking in 48h, in advance
When stress loss is greater than the 10% of axis force of anchor design value, tensioning is compensated.
5. prestressed anchor injection forming construction method according to claim 3, it is characterised in that: when slip casting, will prepare
Rapid solidification anchor agent be all put into slip casting machine slip casting aperture, Anchor Agent, which is completely covered by slip casting aperture, prevents air from entering, to rapid hardening
After Anchor Agent fully enters Grouting Pipe, the retarding mortar of prior mixing is put into slip casting slot starts to infuse slow setting anchor mortar immediately,
Retarding mortar will be in rapid solidification anchor agent whole press-in hole.
6. prestressed anchor injection forming construction method according to claim 3, it is characterised in that: the measurement, which is put, a little adopts
Hole location is accurately made with total station, and makes mark with red paint.
7. prestressed anchor injection forming construction method according to claim 3, it is characterised in that: the pore-creating is using more
Arm drilling, control hole location deviation are less than 200mm, and hole depth is not less than anchor rod effective length, not larger than design hole depth 200mm,
Bore angle deviation processed is less than 3 °.
8. prestressed anchor injection forming construction method according to claim 3, it is characterised in that: the anchor hole, which is cleared up, is
Flushing is robbed with high pressure geomantic omen after the completion of drilling, until there is no terminating to rinse after muddy water outflow, and blown water with high pressure air pressure gun
Portal outer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174537.2A CN109778853A (en) | 2019-03-08 | 2019-03-08 | Prestressed anchor injection forming construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174537.2A CN109778853A (en) | 2019-03-08 | 2019-03-08 | Prestressed anchor injection forming construction method |
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| Publication Number | Publication Date |
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| CN109778853A true CN109778853A (en) | 2019-05-21 |
Family
ID=66486840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201910174537.2A Pending CN109778853A (en) | 2019-03-08 | 2019-03-08 | Prestressed anchor injection forming construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113445519A (en) * | 2021-06-11 | 2021-09-28 | 中国水利水电第九工程局有限公司 | Grouting anchor rod construction process for supporting side slope |
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| JP2007211412A (en) * | 2006-02-07 | 2007-08-23 | Honma Giken Kk | Anchor construction method |
| 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 |
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2019
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| JP2007211412A (en) * | 2006-02-07 | 2007-08-23 | Honma Giken Kk | Anchor construction method |
| 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 |
| CN102080377A (en) * | 2010-12-13 | 2011-06-01 | 张继红 | Composite anchor rod and guide construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113445519A (en) * | 2021-06-11 | 2021-09-28 | 中国水利水电第九工程局有限公司 | Grouting anchor rod construction process for supporting side slope |
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