CN109706927A - A kind of prestressed rock-soil bolt and preparation method of free section thereof - Google Patents
A kind of prestressed rock-soil bolt and preparation method of free section thereof Download PDFInfo
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- CN109706927A CN109706927A CN201910051700.6A CN201910051700A CN109706927A CN 109706927 A CN109706927 A CN 109706927A CN 201910051700 A CN201910051700 A CN 201910051700A CN 109706927 A CN109706927 A CN 109706927A
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- 239000002689 soil Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000004873 anchoring Methods 0.000 claims abstract description 70
- 239000011435 rock Substances 0.000 claims abstract description 37
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 239000004033 plastic Substances 0.000 claims abstract description 18
- 229920003023 plastic Polymers 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 8
- 210000002435 tendon Anatomy 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920006327 polystyrene foam Polymers 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 33
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 230000006641 stabilisation Effects 0.000 abstract description 4
- 238000011105 stabilization Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 230000011218 segmentation Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 239000008267 milk Substances 0.000 description 4
- 210000004080 milk Anatomy 0.000 description 4
- 235000013336 milk Nutrition 0.000 description 4
- 210000003205 muscle Anatomy 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 239000004746 geotextile Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
A kind of preparation method of Prestressed Rock soil anchor bolt and its free segment, belong to Geotechnical Engineering field, the anchor pole includes anchor head and anchor rod body, anchor rod body includes the presstressed reinforcing steel being set in the drilling of foundation pit slope surface or side slope surface drilling, anchoring body and free body, presstressed reinforcing steel is continuous whole reinforcing bar, anchoring body and free body are set on presstressed reinforcing steel, the preparation method of Prestressed Rock soil anchor bolt and its free segment proposed by the present invention is to fill the free segment of rock soil anchor using foamed plastics, form flexible free segment, when anchor pole applies prestressing force, slide mass is compressed, due to the presence of flexible free segment, free segment and corresponding slide mass can be really achieved by anchor pole locking load compression, effective compressive pre-stress can be established in slide mass, sliding surface generates compression, to improve the shear resistance of sliding surface, so that The stabilization of foundation pit or side slope and safety can be guaranteed.
Description
Technical field
The invention belongs to Geotechnical Engineering fields, are related to foundation pit and slope project, are related specifically to a kind of prestressing force
The preparation method of rock soil anchor and its free segment.
Background technique
According to the basic principle and foundation pit of soil mechanics or the designing technique standard requirements of side slope, in the sliding of foundation pit or side slope
Anchor bar body should be made into free segment in body section, and anchor bar body should be made into anchoring section in the liptinite section of foundation pit or side slope, pass through
The frictional resistance that anchoring section anchor bar body provides prevents the production of sliding surface plus the effect constraint slide mass that is locked of anchor pole outer end
It is raw, to realize the purpose to match with calculation model for design, to ensure the stabilization of foundation pit or slope project, guarantee engineering peace
Entirely.
The mooring rod technique of existing foundation pit and slope project adds steel to twist using pea gravel concreten or mortar or cement paste
The scheme of line or steel tendon or high tensile reinforcement, the practice of free segment and anchoring section for anchor bar body, practical engineering application process
In, although having divided free segment and anchoring section in design drawing, there is no distinguish free segment different from the work of anchoring section mostly
Method, but anchor bar body one is poured into bottom, or even give the differentiation scheme of free segment and anchoring section, do not reach but
The effect of differentiation；Or propose technical solution is of poor quality, low efficiency, at high cost, it is difficult to promote and apply in practical projects.
Application No. is 201410030080.5 Chinese patent, a kind of multistage anchoring type resin anchor and its anchoring are disclosed
Method, it includes anchor bar body and aperture preloader, and an anchoring section is equipped at intervals on anchor pole, remaining section is free segment；The point
Anchoring section is that dentation cutting ring is machined on the anchor bar body of this section, and dentation cutting ring housing has a two-component resin anchoring cartridge, double groups
Part resin anchoring cartridge both ends are cased with spacer ring, so that anchor bar body to be successively divided into the first free segment, the since aperture
Some anchoring sections, the second free segment, second point anchoring section, third free segment, thirdly anchoring section, it is desirable that the first free segment is in
The relaxation zone of country rock, thirdly anchoring section is in the elastic region of country rock, remaining section is in the plastic zone of country rock.The technical solution point
The quantity and each section of length of anchoring section and free segment can be adjusted according to pressure from surrounding rock characteristic distributions, dispersed load, avoided
Superpower stress occurs in anchor pole end to concentrate, the body of rod is prevented to be broken or extract anchoring body.The technical solution there are the problem of
Be: complicated for operation, work efficiency is low, quality assurance difficulty is big, at high cost etc., especially quality problems, due to resin mobility and
Permeability is extremely strong, the local sealing to consolidate and being limited in the region of one section of anticipation with the ground on periphery, in rock mass
Has no possibility, resin is inevitable to be overflowed from anchoring section, causes to fail.
Application No. is 201520526632.1 Chinese patents, disclose a kind of water power side slope free section of anchor cable grouting knot
Structure, including side slope surface and the anchor cable being set in side slope surface drilling, the anchor cable drilling is divided into anchoring section and free segment,
Middle free segment is between anchoring section and side slope surface, including being socketed the anchor cable body being set in the anchor cable drilling, the anchor
Grouting Pipe is provided in cable body, the outer rim that anchor cable body is located at the part of free segment is socketed with sealing wrap.The technical solution uses
Geotextiles are that anchor bar body makees housing, it is intended to anchor bar body and rock mass be isolated, to achieve the purpose that reduce side friction, due to drilling
The roughening and cement slurry of side wall can permeate the characteristic of geotextiles, and practical frictional resistance can be bigger, and free segment function is caused to lose
Effect.
Application No. is 201410032446.2 Chinese patent, a kind of multistage anchoring type grouting rock bolt and its anchoring are disclosed
Method, it includes anchor bar body and aperture preloader, and anchor pole is also equipped at intervals with free segment, and the free segment is on the anchor bar body
It is cased with one section of plastic bushing, the both ends contractibility washer of plastic bushing is blocked or tightened, and the anchor bar body for being cased with plastic bushing is
Free segment, the anchor bar body of remaining section are a point anchoring section, so that anchor bar body to be successively divided into the first free segment, the since aperture
Some anchoring sections, the second free segment, second point anchoring section, third free segment, thirdly anchoring section, it is desirable that the first free segment is in
The relaxation zone of country rock, thirdly anchoring section is in the elastic region of country rock, remaining section is in the plastic zone of country rock.Technical solution examination
Figure makes anchor bar body become free segment in its section by plastic bushing, still, due to the frictional resistance between anchor bar body and rock mass
Or cohesive force still has, by the transmitting of anchor bar body Compressive Bearing Capacity, the frictional resistance or cohesive force of this section anchor bar body are still
Reinforcing bar, steel tendon or steel strand wires can be passed to by the anchor bar body of adjacent anchoring section, the free segment can not play free segment
Effect.
Application No. is 201510434626.8 Chinese patents, disclose a kind of anchor cable subregion anchoring segmentation preload rock stratum control
Method processed, this method implements subregion anchoring using anchor cable, segmentation pre-tightens.Subregion anchoring is directed to fracture area, plastic zone and elasticity
Anchoring section is set separately in area, and anchoring sequence is followed successively by elastic region, plastic zone and fracture area, and elastic region anchoring section uses resin anchoring
Agent anchoring, plastic zone and fracture area are anchored using slip casting；Segmentation pre-tightens after i.e. each anchoring is stablized except the anchoring section of aperture, right
The free segment in anchoring section outer end to aperture carries out tensioning preload.The technical solution can effectively improve the reliability of cable bolting,
Subregion setting anchoring section can effectively avoid whole failure of cable caused by anchor cable is locally broken, and slip casting anchoring has anchoring anchor
Rope and the double action for reinforcing crack country rock；Segmentation, which pre-tightens, has anchor cable overall length compared with high pre-stress, and active support effect is obvious
It improves, CONTROL OF STRATA MOVEMENT effect can be effectively improved.The technical solution is suitable for permanent anchor pole, for facing for base pit engineering
When property anchor pole, this way is complicated for operation, work efficiency is low, long construction period, at high cost.
Realize the Free Transform effect of provisional free section, free segment is allowed for by Free Compression.Existing skill
Art is unable to satisfy such requirement, therefore needs the new technical solution of one kind to solve these problems.
Summary of the invention
The technical problems to be solved by the present invention are: providing the preparation side of a kind of Prestressed Rock soil anchor bolt and its free segment
Method, so that foundation pit or the anchor pole of side slope become in slide mass section can lock the free segment that load compresses, anchor pole by anchor pole
It locks load and effectively generates compression in sliding surface, improve the shear resistance of sliding surface, it is ensured that the stabilization of foundation pit or slope project,
Guarantee engineering safety.
The specific present invention adopts the following technical scheme that:
The present invention provides a kind of Prestressed Rock soil anchor bolts, it is characterised in that: the anchor pole includes anchor head and anchor rod body, institute
Stating anchor rod body includes presstressed reinforcing steel, anchoring body and the free body being set in the drilling of foundation pit slope surface or side slope surface drilling, institute
Stating presstressed reinforcing steel is continuous whole reinforcing bar, is divided into two parts, respectively anchoring section presstressed reinforcing steel and free segment presstressed reinforcing steel, from
It is enclosed with outside the aperture side of the drilling of foundation pit slope surface or side slope surface drilling, free segment presstressed reinforcing steel by section presstressed reinforcing steel anti-
Rotten separation layer；The anchoring body is arranged outside anchoring section presstressed reinforcing steel, and anchoring body and anchoring section presstressed reinforcing steel constitute anchor pole
Anchoring section；The free body is arranged outside free segment presstressed reinforcing steel, free body and free segment presstressed reinforcing steel constitute anchor pole from
By section.
The material of the anchoring body uses cement base cementitious mixes.
The material of the free body uses foamed plastics.
The present invention also provides a kind of free phase methods for preparing the Prestressed Rock soil anchor bolt, which is characterized in that should
Method includes the following steps,
Step 1: preparing free body
More than two free bodies are prepared using polystyrene foam plastics or polyurethane foam plastics；Free body is cylinder
Shape, diameter are less than bore diameter 3mm~50mm for accommodating anchor rod body, segmentation or whole section of preparation；Each free body it is total
Length is the freedom length of anchor pole used in free body；The center of free body is arranged elongated perforation circular hole, the circular hole it is straight
Diameter is greater than outer diameter 2mm~20mm of anti-corrosion separation layer outside presstressed reinforcing steel；In the position apart from free body outer wall clear distance 5mm~20mm
The circular pipe hole that an elongated perforation is set again is set, the diameter of conduit hole is greater than catheter outer diameter 2mm~20mm；
Step 2: Rock And Soil drills
It drills in the slope surface of Rock And Soil foundation pit or side slope by the diameter of design requirement, length and the gradient；Hole depth etc.
In anchor rod body length, i.e. the sum of the anchoring section of anchor pole and the length of free segment；
Step 3: material prepares
Presstressed reinforcing steel is prepared by the material of design requirement, quantity, specification and length, and inner end anchor is set by design requirement
Head；Anti-corrosion separation layer is arranged in external in free segment presstressed reinforcing steel；In the range of presstressed reinforcing steel free segment, corresponding free body
Free body prepared by step 1 is set on the outside of presstressed reinforcing steel by center hole；
Conduit is run through to the conduit hole for being inserted through free body, keeps conduit inner end concordant with the inner end of presstressed reinforcing steel；
Step 4: joint bar is in the milk
The material that step 3 is prepared is sent into the hole of step 2 drilling；It prepares grouting material and passes through conduit to step 2
It is in the milk in the hole of drilling, termination when free body is displaced outwardly or the gap between free body and hole sidewalls has grouting material exudation
Grouting.
So far, the preparation method of Prestressed Rock soil anchor bolt free segment is completed.
Through the above design, the present invention can be brought the following benefits: a kind of Prestressed Rock provided by the invention
The preparation method of soil anchor bolt and its free segment is to fill the free segment of rock soil anchor using foamed plastics, is formed flexible free
Section, when anchor pole applies prestressing force, slide mass is compressed, due to the presence of flexible free segment, free segment and corresponding sliding
Body can be really achieved by anchor pole locking load compression, effective compressive pre-stress can be established in slide mass, sliding surface generates
Compression, so that the shear resistance of sliding surface is improved, so that the stabilization of foundation pit or side slope and safety can be guaranteed.
Detailed description of the invention
Fig. 1 is Prestressed Rock soil anchor bolt schematic diagram as mentioned in the embodiments of the present invention.
Fig. 2 is the free segment diagrammatic cross-section of Prestressed Rock soil anchor bolt as mentioned in the embodiments of the present invention.
Fig. 3 is the anchoring section diagrammatic cross-section of Prestressed Rock soil anchor bolt as mentioned in the embodiments of the present invention.
It is respectively marked in figure as follows: 1- anchoring section, 2- free segment, 3- Rock And Soil, 4- anchoring body, 5- free body, 6- prestressing force
Muscle, 7- conduit.
Specific embodiment
Below with reference to attached drawing of the invention, technical solution in the embodiment of the present invention carries out clear, complete statement, institute
Stating embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ability
Without making creative work, every other embodiment obtained belongs to the present invention to domain those of ordinary skill
Protection scope.
Refering to fig. 1~Fig. 3 proposes a kind of Prestressed Rock soil anchor bolt in the present embodiment, which includes anchor head and anchor pole
The body of rod, the anchor rod body include being set to the drilling of foundation pit slope surface or presstressed reinforcing steel 6,4 and of anchoring body in side slope surface drilling
Free body 5, the presstressed reinforcing steel 6 are continuous whole reinforcing bar, are divided into two parts, respectively anchoring section presstressed reinforcing steel and free segment
Presstressed reinforcing steel, free segment presstressed reinforcing steel drills close to foundation pit slope surface or the aperture side of side slope surface drilling, free segment presstressed reinforcing steel
Outside is enclosed with anti-corrosion separation layer；The anchoring body 4 is arranged outside anchoring section presstressed reinforcing steel, and anchoring body 4 and anchoring section are answered in advance
The anchoring section 1 of power muscle composition anchor pole；The free body 5 is arranged outside free segment presstressed reinforcing steel, and free body 5 and free segment are answered in advance
The free segment 2 of power muscle composition anchor pole；
The material of the anchoring body 4 uses cement base cementitious mixes；
The material of the free body 5 uses the foamed plastics of the factorial production.
The invention also provides a kind of free segment preparation methods of Prestressed Rock soil anchor bolt, which is characterized in that this method packet
Include following steps,
Step 1: preparing free body 5
More than two free bodies 5 are prepared using polystyrene foam plastics or polyurethane foam plastics；Free body 5 is cylinder
Shape, diameter are less than bore diameter 3mm~50mm for accommodating anchor rod body, segmentation or whole section of preparation；Each free body 5 it is total
Length is 2 length of free segment of anchor pole used in free body 5；Elongated perforation circular hole is arranged in the center of free body 5, the circular hole
Diameter is greater than outer diameter 2mm~20mm of 6 outside anti-corrosion separation layer of presstressed reinforcing steel；Apart from 5 outer wall clear distance 5mm~20mm of free body
Position the circular pipe hole of one elongated perforation is set again, the diameter of conduit hole is greater than 7 outer diameter 2mm~20mm of conduit；
Step 2: Rock And Soil 3 drills
It drills in the slope surface of 3 foundation pit of Rock And Soil or side slope by the diameter of design requirement, length and the gradient；Hole depth is just
It is the length of anchor rod body, i.e. the sum of the anchoring section 1 of anchor pole and the length of free segment 2；
Step 3: material prepares
Presstressed reinforcing steel 6 is prepared by the material of design requirement, quantity, specification and length, and inner end anchor is set by design requirement
Head；Anti-corrosion separation layer is arranged in external in free segment presstressed reinforcing steel；In the range of 6 free segment of presstressed reinforcing steel, corresponding free body 5
Center hole, free body 5 prepared by step 1 is set on the outside of presstressed reinforcing steel 6；
Conduit 7 is run through to the conduit hole for being inserted through free body 5, keeps 7 inner end of conduit concordant with the inner end of presstressed reinforcing steel 6；
Step 4: joint bar is in the milk
The material that step 3 is prepared is sent into the hole of step 2 drilling, is prepared grouting material and is passed through conduit 7 to step
It is in the milk in the hole of two drillings, when free body 5 is displaced outwardly or the gap between free body 5 and hole sidewalls has grouting material exudation
Terminate grouting.
So far, the preparation method of Prestressed Rock soil anchor bolt free segment is completed.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910051700.6A CN109706927A (en) | 2019-01-21 | 2019-01-21 | A kind of prestressed rock-soil bolt and preparation method of free section thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910051700.6A CN109706927A (en) | 2019-01-21 | 2019-01-21 | A kind of prestressed rock-soil bolt and preparation method of free section thereof |
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| Publication Number | Publication Date |
|---|---|
| CN109706927A true CN109706927A (en) | 2019-05-03 |
Family
ID=66262363
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910051700.6A Pending CN109706927A (en) | 2019-01-21 | 2019-01-21 | A kind of prestressed rock-soil bolt and preparation method of free section thereof |
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| CN (1) | CN109706927A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258928A (en) * | 2019-06-26 | 2019-09-20 | 中国长江三峡集团有限公司 | A kind of installation method of Nut column deformed bar device |
| CN110593929A (en) * | 2019-10-28 | 2019-12-20 | 中冶沈勘秦皇岛工程设计研究总院有限公司 | Secondary multi-section anchoring anchor cable and use method thereof |
| CN116380596A (en) * | 2023-05-06 | 2023-07-04 | 山东大学 | A kind of soil sample preparation device and method for anchoring direct shear test |
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| CN200961263Y (en) * | 2006-08-29 | 2007-10-17 | 湖北中南岩土工程有限公司 | Fixed valve locking type reclaimable rockbolt |
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| CN103758551A (en) * | 2014-01-22 | 2014-04-30 | 山东科技大学 | Multistage anchoring type resin anchor rod and anchoring method thereof |
| CN103850696A (en) * | 2014-01-22 | 2014-06-11 | 山东科技大学 | Multi-section anchoring type mortar anchor rod and anchoring method thereof |
| CN205062860U (en) * | 2015-08-12 | 2016-03-02 | 河海大学 | Side slope model test device is consolidated to stock |
| CN209652927U (en) * | 2019-01-21 | 2019-11-19 | 吉林建筑大学 | A prestressed rock-soil bolt |
-
2019
- 2019-01-21 CN CN201910051700.6A patent/CN109706927A/en active Pending
Patent Citations (6)
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| CN200961263Y (en) * | 2006-08-29 | 2007-10-17 | 湖北中南岩土工程有限公司 | Fixed valve locking type reclaimable rockbolt |
| CN201428135Y (en) * | 2009-07-23 | 2010-03-24 | 中国科学院水利部成都山地灾害与环境研究所 | A pressure-type carbon fiber prestressed anchor cable landslide prevention and control structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258928A (en) * | 2019-06-26 | 2019-09-20 | 中国长江三峡集团有限公司 | A kind of installation method of Nut column deformed bar device |
| CN110593929A (en) * | 2019-10-28 | 2019-12-20 | 中冶沈勘秦皇岛工程设计研究总院有限公司 | Secondary multi-section anchoring anchor cable and use method thereof |
| CN116380596A (en) * | 2023-05-06 | 2023-07-04 | 山东大学 | A kind of soil sample preparation device and method for anchoring direct shear test |
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Application publication date: 20190503 |
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