CN101929340A - Coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process - Google Patents

Coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process Download PDF

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CN101929340A
CN101929340A CN2009102277906A CN200910227790A CN101929340A CN 101929340 A CN101929340 A CN 101929340A CN 2009102277906 A CN2009102277906 A CN 2009102277906A CN 200910227790 A CN200910227790 A CN 200910227790A CN 101929340 A CN101929340 A CN 101929340A
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grouting
hole
pipe
construction
tunnel
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CN2009102277906A
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CN101929340B (en
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闫昕岭
李国栋
吕振铎
郭成方
李雪峰
申天存
张自新
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平煤建工集团有限公司
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Abstract

The invention discloses a coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process, which comprises the following steps of: (1) construction of a grout stop wall; (2) pipe shed drilling construction comprising hole distribution and hole forming; (3) pipe shed drilling and cleaning construction; (4) pipe shed installation; (5) pipe shed pre-grouting construction; and (6) circulation according to steps (2) to (5), namely constructing a pipe shed hole, mounting a hole and grouting a hole till the grouting is finished; pre-grouting the working face pipe shed for 9 meters, tunneling the pipe shed for 6 meters and reserving an advance distance of 3 meters or tunneling the pipe shed for 7 meters and reserving an advance distance of 2 meters; and after tunneling forward, when the pipe shed is pre-grouted again and constructed according to the steps (2) to (5) without constructing the grout stop wall, directly spraying concrete on the head-on working face till the tunnel construction is finished in the zone. The process has the advantages of simple structure, high construction speed, low cost, safety, reliability, low risk, capability of ensuring the quality of the tunnel and obvious economic benefit.

Description

The coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process

Technical field

The present invention relates to a kind of coal mine underground flat inclined tunnel and pass coal seam, half-edge coal seam, incompetent bed, structure zone of fracture and the bright inclined shaft of surface soil layer and pass building, arterial railway supply line and riverbed section, use the work plane pipe shed pre-grouting advance support construction process.

Background technology

Coal is the main energy sources of China's industry and the national economic development.China's superficial part coal resources reduce in a large number because of continuing exploitation at present, and the mining depth of mine is more and more darker.The coal resources buried depth of China is 2.95 trillion tons below 1000m, accounts for 53% of coal resources total amount.The coal mining degree of depth increases with the speed of annual 8-12m at present.A lot of at present existing a plurality of work planes enter into the degree of depth of 1000m to 1500m.(the ground topsoil is crossed architectural complex, crosses the railway division and is crossed riverbed section etc. for Deep Mine and ground " three times engineerings ".) development and utilization be China's mining industry development trend from now on.The coal seam that runs in the work progress of mine deep, half-edge coal seam, incompetent bed, structure zone of fracture and the bright inclined shaft of topsoil are crossed building, railway division, riverbed section etc., in case the top board roof fall accident takes place, abnormally dangerous.How fast, safety a series of Science and Technology problems such as passes through, and become the great theory and technology problem of mining industry circle.

Summary of the invention

The object of the invention is to provide a kind of coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process, taking off coal seam, half-edge coal seam, incompetent bed, structure zone of fracture and the bright inclined shaft of topsoil etc., by the pre-slip casting of work facial canal canopy formula, can prevent effectively that the tunnel from caving in, large tracts of land roof fall, wall caving, the accident of stopping takes place; Construction technology is simple in structure, and speed of application is fast, and cost is low, and is safe and reliable, and risk is little, can also guarantee roadway quality.

To achieve these goals, the present invention adopts following technical scheme:.The coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process may further comprise the steps:

(1) construction of wall for grouting: do drill site in face of the headwork, extend out the ditching groove by design size to the tunnel outline line, assemble wall for grouting one, the wall for grouting both sides assemble with work stone, middle dead slot concreting; Before assembling,, aqueduct is installed water is derived the place of tunnel water outlet; Wall for grouting assembles in the process, according to design orientation, inclination angle, pre-buried orifice tube between 250~400mm outside the waste section in tunnel, orifice tube exposes 150mm, apart from flange 100mm place, welds a joint that has screw thread in advance, wall for grouting assembles back injection concrete tunnel and peripheral the locating of being connected of wall for grouting is filled and led up, after solidifying 24 hours,, reinforce wall for grouting earlier the aqueduct slip casting shutoff of pre-buried water guide.

(2) pipe canopy drilling construction: evenly deployment tube canopy boring of 300~500mm periphery outside the waste section in driving face arch, pipe canopy pitch of holes is 250~400mm, the degree of depth is 9m;

The cloth hole: the cloth hole method that pipe shed pre-grouting adopts " perimeter hole and mider hole " to combine, " perimeter hole " make in the outer 5m scope of tunnel net section and are consolidated into integral body, and " mider hole " carries out the reinforcement grouting and reinforcing to integral body; Surface soil layer zone of fracture rock crack is consolidated into firm integral body with the slurries filling is full, pipe canopy and tunnel-surrounding country rock are consolidated into firm integral body;

Pore-creating: in the time of the construction wall for grouting, by the orifice tube of design orientation, inclination angle pre-buried good " perimeter hole "; " mider hole " not pre-buried orifice tube, directly construction on the wall; Put up workbench, rig handling fixation to the workbench; Construction drill, when running into broken dirt bed and not advancing, cleaning bottom of hole repeatedly, repeatedly slip-casting is until constructing to projected depth;

(3) pipe canopy boring hole flushing construction: after pore-creating reaches projected depth, connect the hole flushing pipeline, mud and drilling cuttings in the boring are cleaned up with water under high pressure;

(4) pipe canopy installation: slowly down at the bottom of the hole, the flange on the pre-buried orifice tube is docked pipe boron steel pipe tight with double buckle flange on managing the boron steel pipe, use bolt; Behind all the other inlet well pore-formings, the telescopic type hole packer is installed, and the big nut on the hole packer is tightened, it is closely knit that rubber cushion and borehole circumference are fully meshed, the pipe fixation;

(5) pipe shed pre-grouting construction: grouting pipeline is installed, at any time adjust flow, concentration of slurry according to the slip casting situation, allow in the Guan Peng hole slurries along the outside overfall of boring during slip casting, make and be full of after slurries and the slip casting soil layer around the pipe canopy pipe or zone of fracture forms firm integral body, grouting pressure reaches the design grouting pressure, can stop slip casting;

(6) then according to step (2)~(5) circulation, a hole is installed in the Guan Peng hole of constructing, and finish until slip casting in hole of slip casting; Work plane pipe shed pre-grouting 9m tunnels 6m, reserves the leading distance of 3m or tunnels 7m, the leading distance of reservation 2m; Forward behind the driving, once more during pipe shed pre-grouting, during the construction of (2) set by step~(5), the wall for grouting of no longer constructing get final product at the work plane direct injection concrete of meeting head on, till roadway construction finishes this section.

Described step (5) appearance is run, the processing of spillage: in the slip casting process, find race, spillage phenomenon, the method for can run according to the scene, the spillage situation being taked to stick with paste, stop, put notes is handled, to reduce slurries loss.

The grouting pressure of design is 8~10MPa in the described step (5).

Evenly deployment tube canopy boring of 400~500mm periphery outside the waste section in driving face arch in the described step (2), pipe canopy pitch of holes is 300~400mm.

Evenly deployment tube canopy boring of 300~400mm periphery outside the waste section in driving face arch in the described step (2), pipe canopy pitch of holes is 250~300mm.

Slip casting in the described step (5) utilizes the two fluid grouting principle to adopt the cement-sodium silicate slurries full the filling of tunnel-surrounding 5m scope inner pore.

The present invention has the following advantages:

1. coal mine underground flat inclined tunnel work facial canal canopy formula pre-grouting advance support of the present invention was being taken off coal seam, half-edge coal seam, incompetent bed, structure zone of fracture and the bright inclined shaft of surface soil layer by building, arterial railway main line and riverbed section.In tunneling construction, prevention back large tracts of land is caved in and is seriously taken out group, takes out the top, pipe canopy pitch of holes is by 250~400mm control, the degree of depth is pressed the 9m construction, and 9m pipe canopy pipe is installed, and annotates the biliquid slurry and reinforces, full the crack of tunnel-surrounding, pore filling, and be consolidated into integral body with periphery, and increased the supporting capacity in tunnel, improve surrounding rock stability.Total collapse, large tracts of land roof fall and wall caving have been avoided in the tunnelling process.

2. coal mine underground flat inclined tunnel work facial canal canopy formula pre-grouting advance support construction process is simple in structure, and speed of application is fast, and cost is low, and is safe and reliable, and risk is little, can also guarantee roadway quality.Economic benefit is very obvious, and the social benefit of bringing thus that safety realized is then more considerable.

In the step (1), flange purposes: dock with the equivalent diameter of pipe canopy pipe welding and to fix the closed orifices pipe.Pre-buried orifice tube effect: pipe canopy pipe is scurried out when preventing slip casting.The joint purposes of band screw thread: the top valve that diameter 25mm is arranged, slip casting play scavenging action when just having begun, and close upper valve when air has been arranged the back pulp.

In the step (5), in the slip casting process, pressure advances to starch smooth and easy for a short time, illustrate strong, the space is big, can annotate single liquid slurry, increase liquid slurry concentration, boost gradually, increase flow rate of grouting, with the thick slurries of high pressure the water content in the crack is swapped out as early as possible, along with slurries inject injecting cement paste continually.The pressure big crack of fast explanation injecting cement paste of rising is annotated in fact substantially, in order to be full of the slurries state that reaches capacity in the injecting cement paste, can reduce concentration of slurry, reduces flow, improves pressure, makes the interior tiny empty crack of injecting cement paste be full of slurries.

The specific embodiment

Coal mine underground flat inclined tunnel work facial canal canopy formula pre-grouting advance support construction process of the present invention comprises the wall for grouting construction, pipe canopy drilling construction, pipe canopy boring hole flushing construction, pipe canopy fabrication and installation construction and pipe shed pre-grouting construction.

As a kind of improvement of patented technology of the present invention, 400~500mm periphery cloth hole outside taking off coal seam, half-edge coal seam, incompetent bed, the waste section in work plane arch, structure zone of fracture tunnel, pipe canopy pitch of holes 300~400mm.Pipe canopy bore direction, inclination angle and orientation, tunnel, inclination angle are consistent, join ¢ 89mm auger stem or ¢ 50mm round drill rod with ZDY1200S type (or SGZ150 type) all-hydraulic drill, make ¢ 90mm boring, ¢ 75mm * 9m pipe canopy pipe is installed, two fluid grouting is reinforced, utilize the two fluid grouting principle full fracture filling in the tunnel-surrounding 5m scope, and be consolidated into one, increase the supporting capacity of roadway surrounding rock, pipe canopy pipe and tunnel-surrounding country rock are consolidated into firm integral body, strengthen the support coefficient of country rock, improved surrounding rock stability.Driving 7m stays the leading distance of 2m.When constructing for the second time the pre-slip casting in Guan Peng hole, in advance on section, spray the thick concrete of 300mm, directly cloth hole construction, circulation successively at 2m.Bypassed traditional beat advance anchor bolt->driving->anchor net spray temporary lining->take out top (or taking out group)->with round log stop the top->frame U type metal shed->be sprayed onto construction technology such as design thickness (or formwork erection, build concrete) again.

Further improvement as patented technology of the present invention, bright inclined shaft is crossed building, arterial railway main line and riverbed section etc. by surface soil layer, 300~400mm periphery is evenly arranged comb canopy boring outside the waste section in driving face arch, pitch of holes 250~300mm, Guan Peng orientation, inclination angle and orientation, tunnel, inclination angle are consistent.The auger stem drill bit of joining ¢ 89mm with all-hydraulic drill, make ¢ 90mm Guan Peng hole, ¢ 75mm * 9m pipe canopy pipe is installed, two fluid grouting is reinforced, utilize the two fluid grouting principle to adopt the cement-sodium silicate slurries full, and be consolidated into one, increase tunnel supporting capacity on every side the filling of tunnel-surrounding 5m scope inner pore, pipe canopy pipe and tunnel-surrounding are consolidated into firm integral body, improve the stability of periphery.Driving 6m stays the leading distance of 3m, successively circulation.Overcome traditional a large amount of excavation open channels, wall caving is repaiied a large amount of side slopes in the construction, drops into too much support form, expends great amount of manpower and material resources, financial resources, and construction is complicated, has a big risk.

In the time of concrete enforcement, roadway head is cleaned out, it is smooth that head-on wall expands brush, and waste section reaches design size to extending out brush, and the materials barnacle is built wall for grouting one, by design orientation, inclination angle pre-buried ¢ 108mm orifice tube.Work plane is for the second time before the pipe roof construction, and the tunnel that requires to have constructed is carried out permanent support and segmentation and carried out can carrying out the pipe roof construction second time after grouting behind shaft or drift lining reinforces.

1. the construction of wall for grouting

3m in face of the headwork is done drill site, extend out the groove that digs 200mm to the tunnel outline line, assemble wall for grouting one by design size, wall for grouting thickness 1.0m, both sides assemble each 300mm of thickness with work stone, and it is C that middle dead slot 400mm builds label 25Concrete.Before assembling,, aqueduct is installed water is derived the place of tunnel water outlet.Wall for grouting assembles in the process, according to design orientation, inclination angle, pre-buried ¢ 108mm * 1.5m orifice tube between 300~400mm outside the waste section in tunnel, orifice tube exposes 150mm, apart from flange 100mm place, one of welding in advance has screw thread, and (joint of ¢ 25mm * 60mm), wall for grouting assemble the back and spray concrete peripheral the locating of being connected of tunnel and wall for grouting filled and led up.After solidifying 24 hours,, reinforce wall for grouting earlier the aqueduct slip casting shutoff of pre-buried water guide.

2. job practices

Workbench is set up firmly at work plane.Hydraulic drill rig lifted by crane on the workbench fix, proofreaded bore direction and inclination angle, fastening drilling cramp, spud in advance 200mm at a slow speed after, recalibrate the orientation and the inclination angle of boring, can continue to creep into.If in the drilling construction process, running into collapse hole or zone of fracture of foundry loam soil layer does not pull out of hole during drilling depth, cover the stifled dish of ¢ 108mm double buckle flange (be welded with ¢ 25mm * 50mm on the stifled dish and be with threaded joint), tighten with bolt, connect grouting pipeline and carry out slip casting, when grouting pressure reaches 5~8MPa, stop slip casting, carrying out cleaning bottom of hole creeps into, (cleaning bottom of hole) creeps into repeatedly, and repeatedly slip-casting is until the projected depth of constructing.After receiving brill, in the Guan Peng hole, ¢ 75mm * 9m pipe boron steel pipe is installed (is managed canopy Guan Yitou and be drilled with colored hole, length 1m with electric drill; The other end is welded with the stifled dish of ¢ 108mm flange, welding ¢ 25mm in the middle of the stifled dish * 60mm band wire connection head).Connect grouting pipeline, the beginning grouting and reinforcing.Before the slip casting, ¢ 25mm ball valve on the ¢ 25mm * 60mm joint of flange 100mm place welding on the pre-buried orifice tube is opened, allow in the Guan Peng hole slurries along the outside overfall of boring during slip casting, make to be full of after slurries and the slip casting soil layer around the pipe canopy pipe or zone of fracture forms firm integral body.Sealing of hole pressure controls to about 10MPa.A hole is installed in the Guan Peng hole of constructing, and finish until slip casting in hole of slip casting.Work plane pipe shed pre-grouting 9m, driving 6m reserves the leading distance of 3m.After tunneling 6m forward, once more during pipe shed pre-grouting, by former working procedure construction (wall for grouting of no longer constructing get final product at the work plane thick concrete of direct injection 300mm of meeting head on), till roadway construction finishes this section.

3, construction technology

(1). cloth hole: the cloth hole method that pipe shed pre-grouting adopts " periphery and middle part " to combine." perimeter hole " makes in the outer 5m scope of tunnel net section and is consolidated into integral body, and " mider hole " carries out the reinforcement grouting and reinforcing to integral body.Surface soil layer zone of fracture rock crack is consolidated into firm integral body with the slurries filling is full, increases the supporting capacity of roadway surrounding rock rock mass, pipe canopy and tunnel-surrounding country rock are consolidated into firm integral body, raising country rock resistance to overturning.

(2). pore-creating: in the time of the construction wall for grouting, by the orifice tube of design orientation, inclination angle pre-buried good " perimeter hole "; " mider hole " not pre-buried orifice tube, directly construction on the wall.Put up workbench, rig handling fixation to the workbench.Construction drill, when running into broken dirt bed and not advancing, cleaning bottom of hole repeatedly, repeatedly slip-casting is until constructing to projected depth.

(3). hole flushing: after pore-creating reaches projected depth, connect the hole flushing pipeline, mud and drilling cuttings in the boring are cleaned up with water under high pressure.

(3). the mounting pipe canopy: after hole flushing finishes, manually pipe boron steel pipe slowly down at the bottom of the hole, the flange on the pre-buried orifice tube is docked tight with double buckle flange on managing the boron steel pipe, use bolt; Behind all the other inlet wells (reinforcement injected hole) pore-forming, the special-purpose hole packer of ¢ 80mm * 3m telescopic type is installed, with spanner the big nut on the hole packer is tightened, it is closely knit that rubber cushion and borehole circumference are fully meshed, and allows rubber cushion fully play effect, the pipe fixation.

(4). the installation of grouting pipeline: after pipe canopy pipe installed, the peace spherical valve connected double-liquid high pressure slip-casting pipe, threeway blender, four-way and pressure-relief valve earlier.

(5). tube shed grouting: carry out proportioning according to the slip casting situation, adjust flow, concentration of slurry at any time, note changing grouting pressure with variation, reach the design grouting pressure (8~10MPa), can stop slip casting.

(6). run, the processing of spillage: in the slip casting process, as find to run, the spillage phenomenon, can run according to the scene, methods such as the spillage situation is taked to stick with paste, stop, some notes handle, and lose with the minimizing slurries, reach the slip casting intended purposes.

4, the selection of grouting parameter

(1). the preparation of cement grout: the water/binder ratio of cement grout is 1: 1 (weight ratio).

(2). the volume ratio of cement grout and water glass slurries is 1: 0.6~0.8.

(3) .QBZ-BI type waterproof agent dosage is 3% of a cement weight.

(4). grouting pressure: according to the developmental state and the anti-pressure ability of rock stratum, topsoil, whole hole pressure is by 8~10MPa control.Grouting pressure is the energy of slurries diffusions filling, and the size of grouting pressure depends on size, the topsoil space degree of inlet well hydrostatic pressure.

(5). the diffusion radius: the diffusion radius of slurries is different and different with topsoil, space, rock stratum under the constant situation of pressure, and the diffusion radius of slurries has than big-difference.Therefore, rationally determine the diffusion radius of slurries, to economical with materials, reduction of erection time, ensuring the quality of products is significant.In conjunction with slip casting experience in the past, grout spreading range is pressed 5m control.

(6). grouting amount: normal grouting amount is to determine according to the hole that adds solid volume, porosity, slurries setting time, rock stratum of slip casting and the connection situation in crack.Do not run in slip casting under the situation of slurry, make the biliquid slurry inside and outside the tunnel, form curtain as far as possible, full firm integral body, the raising slip casting globality effect of being consolidated into of pore filling.

The curtain-grouting injection rate is calculated as follows: Q=Vna

Q-grouting amount m3, V-need filling and injecting slurry volume m in the formula 3

The n-porosity gets 6%, a-slurries loss coefficient (1.2~1.5) gets 1.4

5. grouting equipment and material are selected:

Pipe shed pre-grouting facilities plan list 1

Pipe shed pre-grouting material planning list 2

Title The specification title Unit Quantity Remarks Orifice tube ¢108mm×1.5m? Root 1/ every hole Processing Steel pipe ¢75mm×9m? Root 1/ every hole Make pipe canopy pipe Grouting Pipe ¢80mm×3m? Root 1/ every hole The special-purpose hole packer of telescopic type Flange ¢108mm? Individual 1/ every hole ? The stifled dish of flange ¢108mm? Cover 1/ every hole The stifled dish processing of double buckle flange Ball valve ¢25mm? Individual 3/ every hole ? Drilling rod ¢50mm×1.0m? Root 100? Round drill rod Drilling rod ¢90mm×1.5m? Root 100? Auger stem Drill bit ¢89mm? Individual 10? Augers Drill bit ¢91mm? Individual 10? ?

(1). cement: the Portland cement of selecting 42.5 grades of label P.O for use.

(2). water glass: modulus is 2.8~3.2, concentration is the water glass of 38~42 Baume degrees.

(3). additive: really must control QBZ-BI type waterproof agent.

(4). other: I type cement anchoring agent (Gu effective).

Claims (6)

1. coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process is characterized in that: may further comprise the steps:
(1) construction of wall for grouting: do drill site in face of the headwork, extend out the ditching groove by design size to the tunnel outline line, assemble wall for grouting one, the wall for grouting both sides assemble with work stone, middle dead slot concreting; Before assembling,, aqueduct is installed water is derived the place of tunnel water outlet; Wall for grouting assembles in the process, according to design orientation, inclination angle, pre-buried orifice tube between 250~400mm outside the waste section in tunnel, orifice tube exposes 150mm, apart from flange 100mm place, welds a joint that has screw thread in advance, wall for grouting assembles back injection concrete tunnel and peripheral the locating of being connected of wall for grouting is filled and led up, after solidifying 24 hours,, reinforce wall for grouting earlier the aqueduct slip casting shutoff of pre-buried water guide.
(2) pipe canopy drilling construction: evenly deployment tube canopy boring of 300~500mm periphery outside the waste section in driving face arch, pipe canopy pitch of holes is 250~400mm, the degree of depth is 9m;
The cloth hole: the cloth hole method that pipe shed pre-grouting adopts " perimeter hole and mider hole " to combine, " perimeter hole " make in the outer 5m scope of tunnel net section and are consolidated into integral body, and " mider hole " carries out the reinforcement grouting and reinforcing to integral body; Surface soil layer zone of fracture rock crack is consolidated into firm integral body with the slurries filling is full, pipe canopy and tunnel-surrounding country rock are consolidated into firm integral body;
Pore-creating: in the time of the construction wall for grouting, by the orifice tube of design orientation, inclination angle pre-buried good " perimeter hole "; " mider hole " not pre-buried orifice tube, directly construction on the wall; Put up workbench, rig handling fixation to the workbench; Construction drill, when running into broken dirt bed and not advancing, cleaning bottom of hole repeatedly, repeatedly slip-casting is until constructing to projected depth;
(3) pipe canopy boring hole flushing construction: after pore-creating reaches projected depth, connect the hole flushing pipeline, mud and drilling cuttings in the boring are cleaned up with water under high pressure;
(4) pipe canopy installation: slowly down at the bottom of the hole, the flange on the pre-buried orifice tube is docked pipe boron steel pipe tight with double buckle flange on managing the boron steel pipe, use bolt; Behind all the other inlet well pore-formings, the telescopic type hole packer is installed, and the big nut on the hole packer is tightened, it is closely knit that rubber cushion and borehole circumference are fully meshed, the pipe fixation;
(5) pipe shed pre-grouting construction: grouting pipeline is installed, at any time adjust flow, concentration of slurry according to the slip casting situation, allow in the Guan Peng hole slurries along the outside overfall of boring during slip casting, make and be full of after slurries and the slip casting soil layer around the pipe canopy pipe or zone of fracture forms firm integral body, grouting pressure reaches the design grouting pressure, can stop slip casting;
(6) then according to step (2)~(5) circulation, a hole is installed in the Guan Peng hole of constructing, and finish until slip casting in hole of slip casting; Work plane pipe shed pre-grouting 9m tunnels 6m, reserves the leading distance of 3m or tunnels 7m, the leading distance of reservation 2m; Forward behind the driving, once more during pipe shed pre-grouting, during the construction of (2) set by step~(5), the wall for grouting of no longer constructing get final product at the work plane direct injection concrete of meeting head on, till roadway construction finishes this section.
2. coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process according to claim 1, it is characterized in that: the processing of race, spillage appears in described step (5): in the slip casting process, find race, spillage phenomenon, the method of can run according to the scene, the spillage situation being taked to stick with paste, stop, put notes is handled, to reduce the slurries loss.
3. according to claim 1 or 2 arbitrary described coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process, it is characterized in that: the grouting pressure of design is 8~10MPa in the described step (5).
4. coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process according to claim 3, it is characterized in that: evenly deployment tube canopy boring of 400~500mm periphery outside the waste section in driving face arch in the described step (2), pipe canopy pitch of holes is 300~400mm.
5. coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process according to claim 3, it is characterized in that: evenly deployment tube canopy boring of 300~400mm periphery outside the waste section in driving face arch in the described step (2), pipe canopy pitch of holes is 250~300mm.
6. according to claim 1,2,4 or 5 arbitrary described coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process, it is characterized in that: the slip casting in the described step (5) utilizes the two fluid grouting principle to adopt the cement-sodium silicate slurries full the filling of tunnel-surrounding 5m scope inner pore.
CN200910227790A 2009-12-31 2009-12-31 Coal mine underground flat inclined tunnel pipe shed pre-grouting advance support construction process CN101929340B (en)

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CN108035738A (en) * 2017-12-08 2018-05-15 中国矿业大学 The anchoring process of more anchor pole simultaneous quantitative slip castings
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CN106368709A (en) * 2016-09-30 2017-02-01 首钢总公司 Construction method of vertical shaft
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