CN101260672B - Weak surface rock slope grouting method and anchor tube for grouting - Google Patents
Weak surface rock slope grouting method and anchor tube for grouting Download PDFInfo
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- CN101260672B CN101260672B CN2008100309289A CN200810030928A CN101260672B CN 101260672 B CN101260672 B CN 101260672B CN 2008100309289 A CN2008100309289 A CN 2008100309289A CN 200810030928 A CN200810030928 A CN 200810030928A CN 101260672 B CN101260672 B CN 101260672B
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Abstract
The invention discloses a weak-plane rock side slope grouting method and an anchor pipe for grouting. An anchor hole is drilled; the diameter of the anchor hole is more than the outside diameter of the anchor pipe body of at least 100 mm; the anchor pipe is placed in the anchor hole; concrete is filled in the anchor hole mouth; suspended grout in a double layer stirring mill is pressed to the anchor pipe for grouting by a grouting pump; when the grouting flow rate is more than the flow rate of grout absorption by rock or the grouting pressure is larger than the shearing resisting intensity of fissure filling in a shallow layer rock body, a grout returning valve is started in order that the grout in the hole returns to a grout storage barrel of the double layer stirring mill for circulating grouting. The weak-plane rock side slope grouting method and the anchor pipe for grouting effectively solve the difficult problems that the prior pressing in type grouting is easy to leak the grout, can not completely fill the fissure and can not be suitable for reinforcing the shallow layer. The circulating grouting method of the invention enlarges the grouting scope, improves the injection rate by the single hole, can effectively reinforce the water seepage and corrosion resisting capacity in the interlayer of the side slope and improve the stabilizing capacity of the whole side slope. The anchor pipe of the invention has the advantages of simple structure, easy manufacture and low costs.
Description
Technical field
The present invention relates to rock mass internal reinforcement method and equipment therefor thereof in the geotechnical engineering, particularly the grouting strengthening method of the rock side slope of plane of weakness interlayer class and used grouting device thereof.
Background technology
In the geotechnical engineering, the rock side slope that contains plane of weakness interlayer class is easy to the landslide under rainfall and groundwater effect.At present, the shallow failure that causes for the water erosion piping that prevents plane of weakness interlayer rock slope, the reinforcement means of employing have and mainly contain two kinds: a kind of is bolt anchorage rock stratum and the domatic integrated processes of sprayed mortar sealing; Another kind is rock stratum high-pressure slip-casting filling solution cavity, tomography, plane of weakness interlayer and joint fissure.
Anchor pole and spray series-parallel connection are closed reinforcement means and existed important disadvantages: the temperature difference between atmosphere and the rock stratum makes domatic concrete-shell tympanites produce crack and absciss layer, causes sealing to lose efficacy rainwater infiltration; Bolt grouting can not be full of the plane of weakness interlayer, and infiltration corrosion anchor rod body shortens anchor pole application life, has stayed potential safety hazard.
The Cementer of rock stratum high-pressure slip-casting has automatic anchor pole and bimetallic tube (or dual pipe).Automatic anchor pole is generally used for decomposed rock, macadam, backfill layer, sandy gravel stratum and boulder bed etc. and is difficult to the pore-forming stratum.Automatic anchor pole will provide slip casting hollow channel and two kinds of performances of drill rod torsional moment, and the special rolling-mill section of employing has increased the cost of anchor pole; Automatic anchor pole has only a slip casting passage, can only be used for forced slip casting.Two-layer equation or double-type Grouting Pipe are used for injecting simultaneously the deep layer location slip casting of two kinds of heterogeneity slurries, because tubing is special, complex structure, cost costliness also can only forced slip castings and can not be as the bolt anchorage rock stratum.
And forced slip casting is a kind of grouting method of pushing slurries compressing interlayer charges, filling rock crack by means of impressed pressure.Forced grouting process is used for shallow layer grouting and has three shortcomings: the one, and side slope superficial slip casting does not have earthing mud jacking layer, will cause domatic race slurry, emit slurry if can not regulate grouting pressure, and the side slope fracture filling is discontented; The 2nd, shallow-layer domatic rock stratum dehydration is serious, and slurries lose moisture in the flow process of anchor hole and rock stratum, mobile variation and stop up and ooze the slurry passage; The 3rd, slurries can not reflux when stopping annotating, and stop up anchor hole, cause and can not pour into repeatedly.
Summary of the invention
The objective of the invention is to solve the slip casting of plane of weakness shallow-layer rock mass and run slurry easily, and the discontented problem of fracture filling, a kind of incorporate circulation grouting method of anchor bolt grouting that is used for Weak surface rock slope shallow-layer rock mass is provided, and a kind of anchor tube of the slip casting that is used to circulate is provided.
The detailed technology scheme that the present invention is used for the circulation grouting method of Weak surface rock slope shallow-layer rock mass is: the Drilling anchor hole, and the anchor hole diameter is than the big 100mm of anchor tube body external diameter; Centering is put into anchor tube in anchor hole, at anchor hole aperture filling concrete; With grouting pump the suspension slurry in the double-deck mixer is pressed into anchor tube slip casting; Regulate flow rate of grouting and grouting pressure according to rock stratum stability by grouting valve and slurry traversing valve in the slip casting process; When defeated slurry flow is inhaled slurry flow or grouting pressure greater than the shear strength of shallow-layer rock cranny charges greater than rock, start slurry traversing valve and make slurries in the hole return the slurry storing tank of mixer, circulation slip casting by return pipe.
Anchor tube used in the said method is made up of the injected hole on anchor head, anchor tube body and the anchor tube body, backing plate and nut are set as the prestressing force bringing device at the anchor head branch, apart from backing plate 600mm～1000mm place stop grouting plug is set, the stop grouting plug bottom connects the return pipe inlet, and outlet extends to the outer slurry storing tank that connects double-deck mixer of anchor hole.
Use anchor tube of the present invention, in anchor hole, form circulation slip casting passage, both can effectively keep the water content of slurries during slip casting, can reduce disturbance by regulating grouting pressure and flow again sloping body rock stratum.Particularly when the processing of domatic race slurry needs appears in supreme overburden layer, can inject clear water flushing anchor hole, prevent slurries frozen plug anchor hole, not only kept passage for postorder section repeatedly slip-casting, and utilize fracture grouting to seal domatic crack, created condition for the slip casting of postorder section improves pressure, slurry is run in traditional forced slip casting and fracture filling is discontented thereby solved effectively, can not be applicable to the difficult problem of shallow layer reinforcement.And anchor tube of the present invention adopts common cored steel just can make, and is simple in structure, is easy to make, with low cost.
Compare with existing slope reinforcement grouting method, circulation grouting method of the present invention had both kept the simple and feasible characteristics of traditional anchoring construction, open filling pressure by raising again and realize that the parting clay fracture grouting seals domatic crack, created condition for repeatedly slip-casting improves grouting pressure; By follow-up slip casting control grouting pressure and flow, enlarged range of grouting, improved single hole slurries injection rate.Adopt circulation grouting method of the present invention, the anti-water that can effectively strengthen the side slope interlayer oozes, the water erosion ability, improves the stabilizing power of side slope integral body.
This invention not only provides a kind of anchor injecting method from the inner shallow layer reinforcement of rock mass, regulation geological disaster for industry plane of weakness interlayer rock side slope such as traffic, water conservancy, the energy and building and soft rock, fragmented rock body, gravel cobble alternating layers side slope, and be that domatic ecological protection and elimination geotechnical engineering artificial construction vestige have been created condition, also eliminated the hidden danger that stabilization works was lost efficacy in advance because of the anchor pole corrosion.
Description of drawings
Fig. 1: anchor tube structural representation of the present invention;
Fig. 2: the sectional structure chart that carries out circulating slip casting with anchor tube of the present invention;
The process chart of Fig. 3: embodiment 2 circulation grouting methods.
The specific embodiment
Embodiment 1
Adopt
The ordinary straight seam welded tube make anchor tube body (6), 20cm place Drilling first is arranged injected hole (8) at the bottom of the hole, to medium-height trestle (7), every 20 Drilling injected holes (8), and welds respectively medium-height trestle (7) at anchor tube body (6) epimere and stage casing at the bottom of the welding hole.Backing plate and nut (2) partly are set as the prestressing force bringing device at anchor head (1), the 800mm place is provided with stop grouting plug (4) apart from backing plate (3), and the stop grouting plug bottom connects return pipe (5) inlet, and the return pipe outlet extends to outside the anchor hole.
Embodiment 2
Certain slope, the express highway section left side is the broken limestone side slope of clay parting.Domatic long 240m, maximum height 39.6m is side slope forward.Side slope is divided into level Four, every grade of high 10m of side slope, and the slope was than 1: 0.75～1: 1.This side slope is by four groups of joints and the cutting of several tomographies, and sloping top natural slope groundwater seepage causes the softening and loss of parting clay in tomography and crack, the bedding glide of shallow-layer rock stratum occurs.The speedway owner requires the domatic ecological protection that carries out, can not sprayed mortar, require side slope is carried out shallow layer reinforcement.Adopt technological process shown in Figure 3 to implement circulation slip casting.
As shown in Figure 2, after the cleaning side slope, Drilling diameter 54mm, the anchor hole of hole depth 4～6m, the anchor hole diameter is than the big 100mm of anchor tube body (6) external diameter.With rock slag in the water under high pressure clean-out opening, put into the anchor tube that embodiment 1 makes, stop grouting plug (4) is installed in degree of depth 600mm position, anchor hole aperture, clog concrete (9) then.Anchor head (1) is installed backing plate (3) and nut (2) with the position of the concordant part of side slope.Adopt label 52.5 Portland cements, cohesive soil, flyash slurry material, utilize double-deck mortar mixer to stir the preparation suspension slurry as suspension slurry.With grouting pump suspension slurry is pressed into anchor tube, pressure meter (12) and grouting valve (10) are established in the anchor tube entrance.Suspension slurry enters anchor hole through injected hole (8), and a part of slurries in the hole squeeze in the plane of weakness interlayer crack.In the slip casting process, according to rock stratum stability and pressure meter, by regulating flow rate of grouting and grouting pressure.When defeated slurry flow is inhaled slurry flow or grouting pressure greater than the shear strength of shallow-layer rock cranny charges greater than rock, start the slurry traversing valve (11) on the return pipe (5), make the slurries hole in return the slurry storing tank of mixer, realization circulation slip casting.Treat to mend slurry, the fluid concrete lattice beam after slurries calculus soma contracts in the hole.When lattice beam intensity reach design strength 70% after, fastening nut (2) applies prestressing force.
To adopt sonic detection and boring coring sample with the slope rock mass after the method slip casting of the present invention, the result shows: the rock mass acoustic velocity has improved 10%～27% in the 1.9m scope of distance anchor hole center, and 6m shallow bore hole low pressure recycle formula slip casting radius surpasses 1.9m.This side slope after 4 years stability state good, the many places localized landslip appears in adjacent not slip casting side slope.
In same side slope forced slip casting and circulating slip casting are compared test, the result shows:
1. forced slip casting method adopts water/binder ratio 2: 1 or 1.5: 1 slurries to open filling, and under water/binder ratio 1.5: 1 and the above condition of maximum grouting pressure 1.6Mpa, sustainable time 25～30min normally is in the milk.Circulating slip casting method adopts 2: 1 slurries of grouting pressure 0.05MPa water/binder ratio to open to irritate and just can obtain the bigger flow that advances to starch, when adopting the sustainable time 40min that normally is in the milk under water/binder ratio 0.8: 1 and the maximum grouting pressure 1.0Mpa condition.
When 2. joint agensis zone grouting pressure reaches 1.6MPa, shallow-layer crack hydraulic fracture occurs and run slurry; The joints development zone just may produce the slabbing action of slurries when grouting pressure reaches 0.2MPa, cause that the face of land emits slurry.
3. use circulation slip casting method anchor hole to many injection and expect 200L admittedly than the single hole of forced slip casting method anchor hole.
Claims (4)
1. a Weak surface rock slope grouting method is characterized in that comprising the steps: the Drilling anchor hole, and described anchor hole diameter is than anchor tube body diameter 100mm greatly at least; Centering is put into anchor tube in anchor hole, the filling concrete; With grouting pump the suspension slurry in the double-deck mixer is pressed into anchor tube slip casting; When defeated slurry flow is inhaled slurry flow or grouting pressure greater than the shear strength of shallow-layer rock cranny charges greater than rock, start the slurry traversing valve on the return pipe, make slurries in the hole return the slurry storing tank of double-deck mixer, circulation slip casting by return pipe; Treat to mend slurry after slurries calculus soma contracts in the hole, the fluid concrete lattice beam, when lattice beam intensity reach design strength 70% after, apply prestressing force.
2. the method for claim 1 is characterized in that: in the slip casting process, regulate flow rate of grouting and grouting pressure according to rock stratum stability by grouting valve and slurry traversing valve.
3. the anchor tube that is used for the described grouting method of claim 1, form by the injected hole on anchor head, anchor tube body and the anchor tube body, it is characterized in that: described anchor head periphery is provided with screw thread, the nut that backing plate is set in the position of the flat side slope of anchor head part and adapts with screw thread is as the prestressing force bringing device, apart from backing plate 600mm～1000mm place stop grouting plug is set, connect the return pipe inlet on the anchor tube body under the stop grouting plug, the return pipe outlet extends to the outer slurry storing tank that connects double-deck mixer of anchor hole, establishes slurry traversing valve on the return pipe.
4. anchor tube as claimed in claim 2 is characterized in that: be welded with medium-height trestle on the described anchor tube body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100309289A CN101260672B (en) | 2008-03-27 | 2008-03-27 | Weak surface rock slope grouting method and anchor tube for grouting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100309289A CN101260672B (en) | 2008-03-27 | 2008-03-27 | Weak surface rock slope grouting method and anchor tube for grouting |
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| CN101260672A CN101260672A (en) | 2008-09-10 |
| CN101260672B true CN101260672B (en) | 2011-04-27 |
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| CN2008100309289A Expired - Fee Related CN101260672B (en) | 2008-03-27 | 2008-03-27 | Weak surface rock slope grouting method and anchor tube for grouting |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101956560B (en) * | 2009-07-11 | 2013-02-20 | 北京中煤矿山工程有限公司 | Stop-grouting plug safety separation device for subvertical ground pre-grouting engineering |
| CN102182191B (en) * | 2011-04-19 | 2013-03-20 | 中水东北勘测设计研究有限责任公司 | Impermeable choking and grouting method for rock plug truncated cone shell in deepwater |
| WO2014127680A1 (en) * | 2013-02-19 | 2014-08-28 | Pei Chunguang | Scissor-type expansion bolt and use thereof |
| CN103643977B (en) * | 2013-11-21 | 2015-08-19 | 中国矿业大学 | A kind of full anchor subregion is by pressure grouting anchor pole and using method thereof |
| CN103669363B (en) * | 2013-12-31 | 2016-01-13 | 青建集团股份公司 | A kind of anti-float anchor rod pressure grouting device for overall |
| CN104832199A (en) * | 2015-04-30 | 2015-08-12 | 广西大学 | Anchor rod and anchoring method adopting anchor rod |
| CN105019458A (en) * | 2015-07-30 | 2015-11-04 | 中铁五局（集团）有限公司 | Deep and thick sand layer covered karst cave grouting system device and construction method |
| CN105862990B (en) * | 2016-03-24 | 2019-05-24 | 上海市机械施工集团有限公司 | A kind of prefabrication and assembly construction shaft wall structure and its construction method |
| CN107675696A (en) * | 2017-08-23 | 2018-02-09 | 中铁二十二局集团有限公司 | A kind of Intelligent deep hole orientation slip casting and monitoring system |
| CN108061687B (en) * | 2017-12-06 | 2020-02-14 | 中南大学 | Geotechnical engineering simulation test platform for researching potential failure surface |
| CN108104474A (en) * | 2018-01-05 | 2018-06-01 | 广州华土建筑工程技术有限公司 | A kind of high-pressure grouting construction method expected using steel construction and CGM |
| CN109162660A (en) * | 2018-10-30 | 2019-01-08 | 中国电建集团成都勘测设计研究院有限公司 | Interior anchor formula orifice closing device |
| CN112647499A (en) * | 2021-01-12 | 2021-04-13 | 中国电建集团中南勘测设计研究院有限公司 | Deepwater ground anchor grouting method |
| CN114352328A (en) * | 2022-01-06 | 2022-04-15 | 徐州徐工基础工程机械有限公司 | Drilling and grouting anchor trolley grouting system and control method thereof |
| CN114718060A (en) * | 2022-05-05 | 2022-07-08 | 湖南科技大学 | Wing-type inflatable anchor pipe and construction method thereof |
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