CN106837382A - A kind of subway tunnel country rock pre grouting from the surface reinforcement process - Google Patents

A kind of subway tunnel country rock pre grouting from the surface reinforcement process Download PDF

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Publication number
CN106837382A
CN106837382A CN201710095827.9A CN201710095827A CN106837382A CN 106837382 A CN106837382 A CN 106837382A CN 201710095827 A CN201710095827 A CN 201710095827A CN 106837382 A CN106837382 A CN 106837382A
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CN
China
Prior art keywords
grouting
subway tunnel
country rock
reinforcement
drilling
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CN201710095827.9A
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Chinese (zh)
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CN106837382B (en
Inventor
刘书杰
王桦
袁辉
袁东锋
高晓耕
张基伟
贺宏伟
邵晨霞
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北京中煤矿山工程有限公司
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Priority to CN2016111873655 priority
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Publication of CN106837382A publication Critical patent/CN106837382A/en
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Publication of CN106837382B publication Critical patent/CN106837382B/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor

Abstract

The present invention is disclosed the invention discloses a kind of subway tunnel country rock pre grouting from the surface reinforcement process, is comprised the following steps:(1) the subway tunnel country rock scope for needing reinforcement, as target rock mass region are determined;(2) pore-creating section construction is inclined:Construction of Inclined drills so that inclined drill draws near close to target rock mass region, and progressively transition is horizontal drilling;Sleeve pipe is installed in inclined drill;(3) construction level slip casting section:Construction level is drilled, and horizontal drilling section is reinforced country rock length and determined by pre-pouring grout;(4) grouting and reinforcing:Slurries by Drill-pipe conveyed to target rock mass;(5) after whole horizontal drilling slip castings terminate, the sleeve pipe in inclined drill is extracted, then carries out sealing of hole.The present invention can effectively reinforce subway tunnel country rock, prevent from the phenomenons such as country rock slump or roof fall occur after metro tunnel excavation, improves subway work efficiency and the subway tunnel country rock pre grouting from the surface reinforcement process of enhancing subway tunnel surrounding rock supporting effect.

Description

A kind of subway tunnel country rock pre grouting from the surface reinforcement process

Technical field

The present invention relates to the construction technology that the pre grouting from the surface of shallow tunnel country rock is reinforced, it is adaptable to subway, underground pipe gallery Deng the subterranean tunnel of municipal works, the stability of fragmented rock body can be improved, improve the Geological Environment Engineering of constructing tunnel.

Background technology

The continuous expansion of city size, the continuous growth of the size of population, cause serious urban traffic jam, this gesture Necessity ask for help increase utilization to the underground space, the effective means that subway turns into and alleviates traffic pressure, accelerates city rhythm.Mesh Before, each big city of China continues to increase dynamics in terms of subway construction, and the construction of subway will be empty China's 21 century Urban Underground Between develop emphasis.All building subway transportation system in more than 20, whole nation city.

Subway tunnel typically belongs to the underground structure of shallow embedding, and, subway line can all pass through urban population compact district, ground Face situation is complicated, river, road, bridge, buildings or structures and military restricted zone etc., therefore, mostly using shield method, ore deposit Mountain method is constructed, and reduces the influence of Construction on Ground.But, Mass Near The Top of Underground Cavity rock mass often produces larger sinking after excavation Drop, fragmented rock body even occurs the phenomenons such as slump, roof fall, and especially the rock mass around the severely-weathered subterranean tunnel of shallow embedding is typically located It is intensive and very among broken state in joint, cause subway work inefficiency and surrounding rock supporting decreased effectiveness.

The content of the invention

In view of this, can effectively reinforce subway tunnel country rock the invention reside in offer one kind, prevent metro tunnel excavation Occur the phenomenons such as country rock slump or roof fall afterwards, improve subway work efficiency and the subway tunnel of enhancing subway tunnel surrounding rock supporting effect Road country rock pre grouting from the surface reinforcement process.

The present invention is achieved through the following technical solutions:

A kind of subway tunnel country rock pre grouting from the surface reinforcement process, comprises the following steps:

(1) the subway tunnel country rock scope for needing reinforcement, as target rock mass region are determined;

(2) pore-creating section construction is inclined:Construction of Inclined drills so that inclined drill draws near close to target rock mass region, And progressively transition is horizontal drilling;Sleeve pipe is installed in inclined drill;

(3) construction level slip casting section:Construction level is drilled, and horizontal drilling section is reinforced country rock length and determined by pre-pouring grout;

(4) grouting and reinforcing:Slurries by Drill-pipe conveyed to target rock mass;

(5) after whole horizontal drilling slip castings terminate, the sleeve pipe in inclined drill is extracted, then carries out sealing of hole.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (1):Country rock length M is less than or equal to 200m, if length is more than 200m, the moment of torsion and propulsive force of rig are not enough;Subway Rock Mass belongs to IV grade or more scope, That is more than or equal to 251, (this classification is derived from rock mass basic quality's index BQ《Standard for classification of engineering rock masses GBT50218- 1994)》;And suitable for shield method and the subway tunnel of mining method construction.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (2):Rig is placed in distance objective rock mass Zone level is the ground of 60m apart from N.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (2):Drilling angle of penetration is 8 °~12 °, If angle exceeds the scope, drilling does not enter target, i.e. drilling track in scope of design cannot be ensured in the depth for setting gradually Transition is lateral aperture.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (2):Inclined drill aperture Φ 127~ 152mm, boring aperture is bigger than normal or less than normal, it is impossible to carry out mortar depositing construction in hole, 108~133 × 5mm of sleeve pipe model Φ using drilling Seamless steel pipe.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (3):Horizontal segment boring aperture Φ 89~ 118mm, the deviation proportion of drilling is less than or equal to 3 ‰.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (3):Horizontal drilling is with subway tunnel center Centered on axle, subway tunnel surrounding is evenly arranged in.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (3):Horizontal drilling cloth hole circle footpath D is 12 ~15m, it is less than normal to influence shield tunnel construction, it is bigger than normal to cause the effective curtain of slip casting cannot to hand over circle;Horizontal drilling number is 8.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (3):Using a bench drill machine sequence construction institute There is horizontal drilling;After the slip casting task of only one of which horizontal drilling all terminates, the next level of drilling machine construction could be migrated and bored Hole;Horizontal drilling is crept into using mud off, drilling slurry performance:Proportion is 1.10~1.25,50~65s of viscosity, silt content Less than 0.6wt%;In step (4):The horizontal grouting section of each horizontal drilling uses " protrusive " segmenting slip casting mode, that is, go up One slip casting section slip casting just carries out the drilling of next slip casting section after terminating;50~80m of each slip casting segment length, influence construction less than normal Efficiency, influence grouting consolidation effect bigger than normal.Hole flushing should be carried out before each slip casting using clear water;Grouting serous fluid is from single liquid cement Slurry, the ratio of mud 1.25:1, cement selection P.O 32.5 Portland cement.

Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (4):Slip casting ending standard is as follows:Slip casting Terminate Stress control in 0.5~1.0MPa, it can be ensured that effective diffusion length of slurries;Single grouting amount less than or equal to 60~ 90m3, can be resulted in blockage the accidents such as pipeline more than this value.

The beneficial effects of the invention are as follows:

Compared with traditional upright opening slip casting, the technique in the present invention has advantages below:

1st, drilling hole count is greatly reduced, and reduces by more than 75% drilling hole amount;

2nd, floor space greatly reduces, about 1 mu of construction technology floor space in the present invention, and traditional handicraft is " full hall It is red " formula arranges vertical injected hole, floor space is too wide, about 4 mu;

3rd, often there is buildings or structures, river, bridge etc. above subway tunnel, conventional vertical grouting process is limited to ground Shape landforms, cannot be constructed at all, and the technique in the present invention can be adjusted to construction site open according to actual conditions Area.

4th, the purpose of grouting and reinforcing has specific aim, and consolidation effect is more obvious, and, the reinforcing scope of tunnel surrounding expands Much larger, the rock mass reinforcing regional diameter centered on subway tunnel axle center reaches 22.014m, and area reaches 385m2, reinforce country rock Volume reaches 77000m3

Brief description of the drawings

Fig. 1 is horizontal drilling arrangement cross-sectional view in subway tunnel country rock pre grouting from the surface reinforcement process of the present invention.

Fig. 2 is subway tunnel wall rock grouting hole profile in subway tunnel country rock pre grouting from the surface reinforcement process of the present invention.

1- subway tunnels;2- horizontal drillings;3- reinforcing scopes;4- inclines pore-creating section;5- horizontal groutings section;6- ground;7- Rig.

Specific embodiment

It is the scheme in the clear explanation present invention, preferred embodiment is given below and is described with reference to the accompanying drawings.

A kind of subway tunnel country rock pre grouting from the surface reinforcement process, comprises the following steps:

(1) the subway tunnel country rock scope for needing reinforcement, as target rock mass region are determined;

Country rock length is less than or equal to 200m;Subway Rock Mass belongs to IV grade or more scope, i.e. rock mass basic quality Index BQ is more than or equal to 251, it is adaptable to the subway tunnel of shield method and mining method construction.

(2) pore-creating section construction is inclined:Construction of Inclined drills so that inclined drill draws near close to target rock mass region, And progressively transition is horizontal drilling;Sleeve pipe is installed in inclined drill;Rig is placed in distance objective rock mass zone level distance The ground of 60m.Drilling angle of penetration is 8 °~12 °.Inclined drill aperture Φ 152mm, the sleeve pipe model Φ seamless steel of 133 × 5mm Pipe.

(3) construction level slip casting section:Using DDW-600 horizontal directional drilling machines and SMWD-76 wireless drilling instrument construction levels Drilling, horizontal drilling section is reinforced country rock length and is determined by pre-pouring grout;Horizontal segment boring aperture Φ 118mm, the deviation proportion of drilling is small In or equal to 3 ‰.Horizontal drilling is evenly arranged in subway tunnel surrounding centered on subway tunnel central shaft.Horizontal drilling cloth Kong Quan footpaths D is 12m (a diameter of 6m of subway tunnel), and horizontal drilling number is 8.Bored using all levels of a bench drill machine sequence construction Hole;After the slip casting task of only one of which horizontal drilling all terminates, the next horizontal drilling of drilling machine construction could be migrated;Level is bored Hole is crept into using mud off, uses 3NB-260 slush pumps, drilling slurry performance:Proportion is 1.10~1.25, viscosity 50~ 65s (Marsh funnel), silt content is less than 0.6wt%.

(4) grouting and reinforcing:Using NBB-390 grouting pumps slurries by the way that in Drill-pipe conveyed to target rock mass, slurries are filled To in the crack of fragmented rock body and hole, country rock resistance to overturning is improved, serve the effect for reinforcing fragmented rock body;

Stop grouting plug is positioned using TDKW-2, the horizontal grouting section of each horizontal drilling uses " protrusive " segmenting slip casting side Formula, that is, going up just carries out the drilling of next slip casting section after a slip casting section slip casting terminates, each slip casting 50~80m of segment length, every time Hole flushing should be carried out before slip casting using clear water;Grouting serous fluid is from single liquid cement mortar, the ratio of mud 1.25:1, cement selection P.O 32.5 Portland cement.Slip casting ending standard is as follows:Slip casting terminates Stress control in 0.5~1.0MPa;Single grouting amount is less than Or equal to 60m3.Slip casting ending standard is as follows:Slip casting terminates Stress control in 0.5~1.0MPa;Single grouting amount is less than or waits In 60m3

(5) after whole horizontal drilling slip castings terminate, the sleeve pipe in inclined drill is extracted using ZSB-60 drawbenches, then Carry out sealing of hole.

Subway tunnel country rock pre grouting from the surface reinforcement process of the invention is directed to the crushed zone of subway tunnel country rock and splits Gap water guide band carries out the construction technology of pre grouting from the surface reinforcing, using horizontal orientation drilling technology construction level in tunnel surrounding Injected hole, using drilling rod as slip casting passage, Rock Mass, filling fracture and hole is pressed into using high-pressure injection pump by grouting serous fluid Hole, realizes reinforcing the effect of country rock.Judge there is crushed zone, crack in the stratum that subway line plan is passed through by engineering investigation The weakness rock mass such as water guide band, the subway tunnel country rock for this part carries out pre grouting from the surface Reinforcement.

First, subway tunnel country rock is in and does not excavate the stage, and country rock is not by the influence of construction disturbance;Secondly, utilize Ground no-dig technique drilling machine construction inclined drill, close to during target rock mass region progressively transition be horizontal drilling, horizontal drilling section by Pre-pouring grout is reinforced country rock length and is determined, sleeve pipe is installed in tilting section drilling, and horizontal segment drilling is open-hole slip casting section, high using ground Pressure injection stock pump is slurries by Drill-pipe conveyed to target rock mass;Finally, after reaching slip casting standard, sealing of hole is carried out to drilling.

Above-described embodiment is only intended to clearly illustrate the invention example, and not has to the invention The restriction of body implementation method.For those of ordinary skill in the field, can also make on the basis of the above description The change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.It is all of the invention Spirit and principle within extend out it is any obvious change or variation still in the invention claim guarantor Among shield scope.

Claims (10)

1. a kind of subway tunnel country rock pre grouting from the surface reinforcement process, it is characterised in that comprise the following steps:
(1) the subway tunnel country rock scope for needing reinforcement, as target rock mass region are determined;
(2) pore-creating section construction is inclined:Construction of Inclined drills so that inclined drill draws near close to target rock mass region, and by Step transition is horizontal drilling;Sleeve pipe is installed in inclined drill;
(3) construction level slip casting section:Construction level is drilled, and horizontal drilling section is reinforced country rock length and determined by pre-pouring grout;
(4) grouting and reinforcing:Slurries by Drill-pipe conveyed to target rock mass;
(5) after whole horizontal drilling slip castings terminate, the sleeve pipe in inclined drill is extracted, then carries out sealing of hole.
2. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 1, it is characterised in that in step (1) In:Country rock length M is less than or equal to 200m;Subway Rock Mass belongs to IV grade or more scope, i.e. rock mass basic quality's index BQ is more than or equal to 251;And suitable for shield method and the subway tunnel of mining method construction.
3. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 1, it is characterised in that in step (2) In:It is the ground of 60m that rig is placed in distance objective rock mass zone level apart from N.
4. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 3, it is characterised in that in step (2) In:Drilling angle of penetration is 8 °~12 °.
5. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 4, it is characterised in that in step (2) In:Inclined drill aperture 127~152mm of Φ, sleeve pipe model Φ 108~133 × 5mm seamless steel pipes.
6. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 1, it is characterised in that in step (3) In:Horizontal segment boring aperture 89~118mm of Φ, the deviation proportion of drilling is less than or equal to 3 ‰.
7. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 6, it is characterised in that in step (3) In:Horizontal drilling is evenly arranged in subway tunnel surrounding centered on subway tunnel central shaft.
8. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 7, it is characterised in that in step (3) In:Horizontal drilling cloth hole circle footpath D is 12~15m, and horizontal drilling number is 8.
9. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 8, it is characterised in that in step (3) In:Using the bench drill all horizontal drillings of machine sequence construction;After the slip casting task of only one of which horizontal drilling all terminates, ability The migration next horizontal drilling of drilling machine construction;Horizontal drilling is crept into using mud off, drilling slurry performance:Proportion be 1.10~ 1.25,50~65s of viscosity, silt content are less than 0.6wt%;In step (4):The horizontal grouting section of each horizontal drilling is used " protrusive " segmenting slip casting mode, that is, going up just carries out the drilling of next slip casting section, each slip casting after a slip casting section slip casting terminates 50~80m of segment length;Hole flushing should be carried out before each slip casting using clear water;Grouting serous fluid is from single liquid cement mortar, the ratio of mud 1.25: 1, cement selection P.O 32.5 Portland cement.
10. subway tunnel country rock pre grouting from the surface reinforcement process according to claim 9, it is characterised in that in step (4) In:Slip casting ending standard is as follows:Slip casting terminates Stress control in 0.5~1.0MPa;Single grouting amount less than or equal to 60~ 90m3
CN201710095827.9A 2016-12-20 2017-02-22 A kind of subway tunnel country rock pre grouting from the surface reinforcement process CN106837382B (en)

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CN2016111873655 2016-12-20

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CN106837382B CN106837382B (en) 2019-09-24

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108303729A (en) * 2018-02-27 2018-07-20 中南大学 Shield tunnel influence area Karst method under building
CN108798717A (en) * 2018-07-09 2018-11-13 山东省煤田地质局第四勘探队 A kind of borehole design method that tunnel vault wall rock grouting under urban road is reinforced
CN110528523A (en) * 2019-09-02 2019-12-03 湖南宏禹工程集团有限公司 A kind of highly permeable stratum building foundation pit horizontal grouting back cover construction method
CN110645002A (en) * 2019-09-29 2020-01-03 淮北工业建筑设计院有限责任公司 Support method for coal mine tunnel

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JP2000186490A (en) * 1998-12-22 2000-07-04 Kfc Ltd Natural ground reinforcement
CN103821538A (en) * 2013-12-26 2014-05-28 安徽理工大学 Ground preliminary grouting method for J-shaped horizontal wing-shaped branch holes
CN103835729A (en) * 2013-11-11 2014-06-04 北京中煤矿山工程有限公司 Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock

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JPH10121477A (en) * 1996-10-23 1998-05-12 Ohbayashi Corp Method of reinforcing earth layer side wall and method of constructing underground passage for visiting remains
JP2000186490A (en) * 1998-12-22 2000-07-04 Kfc Ltd Natural ground reinforcement
CN103835729A (en) * 2013-11-11 2014-06-04 北京中煤矿山工程有限公司 Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock
CN103835729B (en) * 2013-11-11 2016-06-15 北京中煤矿山工程有限公司 Deep distance roadway surrounding rock pre grouting from the surface reinforcement process
CN103821538A (en) * 2013-12-26 2014-05-28 安徽理工大学 Ground preliminary grouting method for J-shaped horizontal wing-shaped branch holes

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108303729A (en) * 2018-02-27 2018-07-20 中南大学 Shield tunnel influence area Karst method under building
CN108798717A (en) * 2018-07-09 2018-11-13 山东省煤田地质局第四勘探队 A kind of borehole design method that tunnel vault wall rock grouting under urban road is reinforced
CN110528523A (en) * 2019-09-02 2019-12-03 湖南宏禹工程集团有限公司 A kind of highly permeable stratum building foundation pit horizontal grouting back cover construction method
CN110645002A (en) * 2019-09-29 2020-01-03 淮北工业建筑设计院有限责任公司 Support method for coal mine tunnel

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