CN106837382B - 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
CN106837382B
CN106837382B CN201710095827.9A CN201710095827A CN106837382B CN 106837382 B CN106837382 B CN 106837382B CN 201710095827 A CN201710095827 A CN 201710095827A CN 106837382 B CN106837382 B CN 106837382B
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drilling
grouting
slip casting
construction
subway tunnel
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CN106837382A (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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Beijing Zhongmei Mine Engineering Co Ltd
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Beijing Zhongmei Mine Engineering Co Ltd
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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, which is disclosed, includes the following steps: that (1) determines the subway tunnel country rock range to need reinforcement, as target rock mass region the invention discloses a kind of subway tunnel country rock pre grouting from the surface reinforcement process;(2) inclination pore-creating section construction: Construction of Inclined drilling, so that inclined drill is from the distant to the near close to target rock mass region, and gradually transition is horizontal drilling;Casing is installed in inclined drill;(3) construction level slip casting section: construction level drilling, horizontal drilling section are reinforced country rock length by pre-pouring grout and are determined;(4) slurries grouting and reinforcing: are passed through Drill-pipe conveyed into target rock mass;(5) after whole horizontal drilling slip castings, the casing in inclined drill is extracted, sealing of hole is then carried out.The present invention can effectively reinforce subway tunnel country rock, prevent from occurring phenomena such as country rock slump or roof fall after metro tunnel excavation, improve subway work efficiency and enhancing the subway tunnel country rock pre grouting from the surface reinforcement process of 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 technologies that the pre grouting from the surface of shallow tunnel country rock is reinforced, and are suitable for subway, underground pipe gallery The subterranean tunnel of equal municipal works, can be improved the stability of fragmented rock body, improves the Geological Environment Engineering of constructing tunnel.
Background technique
Continuous expansion, the continuous growth of the size of population of city size, cause serious urban traffic jam, this gesture Necessity ask for help increase utilization to the underground space, the effective means that subway becomes and alleviates traffic pressure, accelerates city rhythm.Mesh Before, each big city in China continues to increase dynamics in terms of subway construction, and the construction of subway will be that China's 21 century Urban Underground is empty Between the emphasis developed.All building subway transportation system in national more than 20 cities.
Subway tunnel typically belongs to the underground structure of shallow embedding, moreover, subway line can all pass through urban population compact district, ground Face situation is complicated, therefore river, road, bridge, buildings or structures and military restricted zone etc. mostly use greatly shield method, mine Mountain method is constructed, and the influence of Construction on Ground is reduced.But Mass Near The Top of Underground Cavity rock mass often generates biggish sink after excavation Phenomena such as drop, fragmented rock body even will appear slump, roof fall, especially the rock mass around the severely-weathered subterranean tunnel of shallow embedding is generally located Intensively and very among broken state, subway work inefficiency and surrounding rock supporting decreased effectiveness are caused in joint.
Summary of the invention
In view of this, the invention reside in provide one kind can effectively reinforce subway tunnel country rock, prevent metro tunnel excavation Occur phenomena such as country rock slump or roof fall afterwards, improve subway work efficiency and enhances the subway tunnel of 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, includes the following steps:
(1) the subway tunnel country rock range to need reinforcement, as target rock mass region are determined;
(2) inclination pore-creating section construction: Construction of Inclined drilling, so that inclined drill is from the distant to the near close to target rock mass region, And gradually transition is horizontal drilling;Casing is installed in inclined drill;
(3) construction level slip casting section: construction level drilling, horizontal drilling section are reinforced country rock length by pre-pouring grout and are determined;
(4) slurries grouting and reinforcing: are passed through Drill-pipe conveyed into target rock mass;
(5) after whole horizontal drilling slip castings, the casing in inclined drill is extracted, sealing of hole is then carried out.
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 greater than 200m, the torque and propulsive force of drilling machine are insufficient;Subway Rock Mass belongs to IV grade or range above, That is rock mass basic quality's index BQ is greater than or equal to 251, and (this classification derives from " Standard for classification of engineering rock masses GBT50218- 1994)";And it is suitable for the subway tunnel of shield method and mining method construction.
Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (2): drilling machine is placed in distance objective rock mass Zone level distance N is the ground of 60m.
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 range, drilling does not enter target in scope of design, i.e., drilling track not can guarantee setting depth 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, can not carry out mortar depositing construction in hole, 108~133 × 5mm of casing 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~ The deviation proportion of 118mm, drilling are 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 axis, it is evenly arranged in subway tunnel surrounding.
Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (3): horizontal drilling cloth hole circle diameter D is 12 ~15m, less than normal to will affect shield tunnel construction, the slip casting effective curtain bigger than normal that will cause can not hand over circle;Horizontal drilling number is 8.
Above-mentioned subway tunnel country rock pre grouting from the surface reinforcement process, in step (3): utilizing a bench drill machine sequence construction institute There is horizontal drilling;After the slip casting task whole of only one horizontal drilling, the next horizontal brill of drilling machine construction could be migrated Hole;Horizontal drilling is crept into using mud off, drilling slurry performance: specific gravity 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, i.e., on The drilling of next slip casting section is just carried out after one slip casting section slip casting;50~80m of each slip casting segment length, influence construction less than normal Efficiency, influence grouting consolidation effect bigger than normal.Clear water should be used to carry out hole flushing before each slip casting;Grouting serous fluid selects single liquid cement Slurry, ratio of mud 1.25:1,32.5 ordinary portland cement of cement selection P.O.
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 pressure control in 0.5~1.0MPa, it can be ensured that effective diffusion length of slurries;Single grouting amount be less than or equal to 60~ 90m3, will cause the accidents such as blocking pipeline greater than this value.
The beneficial effects of the present invention are:
Compared with traditional vertical hole slip casting, the technique in the present invention is had the advantage that
1, drilling hole count greatly reduces, and reduces by 75% or more drilling hole amount;
2, occupied area greatly reduces, about 1 mu of construction technology occupied area in the present invention, and traditional handicraft is " full hall It is red " the vertical injected hole of formula arrangement, occupied area is too wide, and about 4 mu;
3, often there is buildings or structures, river, bridge etc. above subway tunnel, conventional vertical grouting process is limited to ground Shape landforms can not construct at all, and construction site can be adjusted to open according to the actual situation by the technique in the present invention Area.
4, the purpose of grouting and reinforcing has specific aim, and consolidation effect is more obvious, moreover, 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
Detailed description of the invention
Fig. 1 is that horizontal drilling arranges 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 sectional view in subway tunnel country rock pre grouting from the surface reinforcement process of the present invention.
1- subway tunnel;2- horizontal drilling;3- reinforcing scope;4- tilts pore-creating section;5- horizontal grouting section;The ground 6-;7- Drilling machine.
Specific embodiment
Scheme in the present invention to clearly illustrate, is given below preferred embodiment and is described with reference to the accompanying drawings.
A kind of subway tunnel country rock pre grouting from the surface reinforcement process, includes the following steps:
(1) the subway tunnel country rock range to need 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 range above, i.e. rock mass basic quality Index BQ is greater than or equal to 251, suitable for shield method and the subway tunnel of mining method construction.
(2) inclination pore-creating section construction: Construction of Inclined drilling, so that inclined drill is from the distant to the near close to target rock mass region, And gradually transition is horizontal drilling;Casing is installed in inclined drill;Drilling machine is placed in distance objective rock mass zone level distance The ground of 60m.The angle of penetration that drills is 8 °~12 °.Inclined drill aperture Φ 152mm, casing model Φ 133 × 5mm seamless steel Pipe.
(3) DDW-600 horizontal directional drilling machine and SMWD-76 wireless drilling instrument construction level construction level slip casting section: are utilized Drilling, horizontal drilling section are reinforced country rock length by pre-pouring grout and are determined;Horizontal segment boring aperture Φ 118mm, the deviation proportion of drilling are small In or equal to 3 ‰.Horizontal drilling is evenly arranged in subway tunnel surrounding centered on subway tunnel central axis.Horizontal drilling cloth Hole circle diameter D is 12m (subway tunnel diameter is 6m), and horizontal drilling number is 8.Utilize all horizontal brills of a bench drill machine sequence construction Hole;After the slip casting task whole of only one horizontal drilling, the next horizontal drilling of drilling machine construction could be migrated;Level is bored Hole is crept into using mud off, and using 3NB-260 slush pump, drilling slurry performance: specific gravity is 1.10~1.25, and viscosity 50~ 65s (Marsh funnel), silt content are less than 0.6wt%.
(4) grouting and reinforcing: slurries are passed through Drill-pipe conveyed into target rock mass using NBB-390 grouting pump, slurries filling Into the crack of fragmented rock body and hole, country rock overall stability is improved, plays the role of 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, i.e., just carry out the drilling of next slip casting section after upper slip casting section slip casting, 50~80m of each slip casting segment length, every time Clear water should be used to carry out hole flushing before slip casting;Grouting serous fluid selects single liquid cement slurry, ratio of mud 1.25:1, cement selection P.O 32.5 Ordinary portland cement.Slip casting ending standard is as follows: slip casting terminates pressure control in 0.5~1.0MPa;Single grouting amount is less than Or it is equal to 60m3.Slip casting ending standard is as follows: slip casting terminates pressure control in 0.5~1.0MPa;Single grouting amount is less than or waits In 60m3
(5) after whole horizontal drilling slip castings, the casing in inclined drill is extracted using ZSB-60 drawbench, then Carry out sealing of hole.
Subway tunnel country rock pre grouting from the surface reinforcement process of the invention is the crushed zone for subway tunnel country rock and splits Gap water guide band carries out the construction technology of pre grouting from the surface reinforcing, utilizes horizontal orientation drilling technology construction level in tunnel surrounding Grouting serous fluid is pressed into Rock Mass, filling fracture and hole using high-pressure injection pump using drilling rod as slip casting channel by injected hole The effect for reinforcing country rock is realized in hole.There are crushed zones, crack in the stratum passed through by engineering investigation judgement subway line plan The weakness rock mass such as water guide band carries out pre grouting from the surface Reinforcement for the subway tunnel country rock of this part.
It is not excavated the stage firstly, subway tunnel country rock is in, country rock does not pass through the influence of construction disturbance;Secondly, utilizing Ground no-dig technique drilling machine construction inclined drill, gradually transition is horizontal drilling when close to target rock mass region, horizontal drilling section by Pre-pouring grout is reinforced country rock length and is determined, casing is installed in tilting section drilling, and horizontal segment drilling is open-hole slip casting section, utilizes ground height Slurries are passed through Drill-pipe conveyed into target rock mass by pressure injection stock pump;Finally, carrying out sealing of hole to drilling after reaching slip casting standard.
Above-described embodiment is only intended to clearly illustrate the invention example, and not has to the invention The restriction of body embodiment.For those of ordinary skill in the art, it can also make on the basis of the above description Other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all of the invention Guarantor of any obvious changes or variations extended out within spirit and principle still in the invention claim It protects among range.

Claims (1)

1. a kind of subway tunnel country rock pre grouting from the surface reinforcement process, which comprises the steps of:
(1) the subway tunnel country rock range to need reinforcement, as target rock mass region are determined;
(2) inclination pore-creating section construction: Construction of Inclined drilling, so that inclined drill is from the distant to the near close to target rock mass region, and by Step transition is horizontal drilling;Casing is installed in inclined drill;
(3) construction level slip casting section: construction level drilling, horizontal drilling section are reinforced country rock length by pre-pouring grout and are determined;
(4) slurries grouting and reinforcing: are passed through Drill-pipe conveyed into target rock mass;
(5) after whole horizontal drilling slip castings, the casing in inclined drill is extracted, sealing of hole is then carried out;
In step (1): country rock length M is less than or equal to 200m;Subway Rock Mass belongs to IV grade or range above, i.e. rock mass Gross index BQ is greater than or equal to 251;And it is suitable for the subway tunnel of shield method and mining method construction;
In step (2): drilling machine is placed in the ground that distance objective rock mass zone level distance N is 60m;
In step (2): drilling angle of penetration is 8 °~12 °;
In step (2): inclined drill aperture 127~152mm of Φ, casing model Φ 108~133 × 5mm seamless steel pipe;
In step (3): the deviation proportion of horizontal segment boring aperture 89~118mm of Φ, drilling are less than or equal to 3 ‰;
In step (3): horizontal drilling is evenly arranged in subway tunnel surrounding centered on subway tunnel central axis;
In step (3): horizontal drilling cloth hole circle diameter D is 12~15m, and horizontal drilling number is 8;
In step (3): utilizing all horizontal drillings of bench drill machine sequence construction;The slip casting task of only one horizontal drilling is complete After portion, the next horizontal drilling of drilling machine construction could be migrated;Horizontal drilling is crept into using mud off, drilling slurry Can: specific gravity is 1.10~1.25, and 50~65s of viscosity, silt content is less than 0.6wt%;In step (4): each horizontal drilling Horizontal grouting section uses " protrusive " segmenting slip casting mode, i.e., just carries out next slip casting section after upper slip casting section slip casting Drilling, 50~80m of each slip casting segment length;Clear water should be used to carry out hole flushing before each slip casting;Grouting serous fluid selects single liquid cement Slurry, ratio of mud 1.25:1, cement selection P.O32.5 ordinary portland cement;
In step (4): slip casting ending standard is as follows: slip casting terminates pressure control in 0.5~1.0MPa;Single grouting amount is less than Or it is 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 Active CN106837382B (en)

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Publication number Priority date Publication date Assignee Title
CN108303729B (en) * 2018-02-27 2020-01-03 中建隧道建设有限公司 Karst detection method for shield tunnel affected area 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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