CN106050284A - Parallel operation type quick tunneling support system and construction method - Google Patents
Parallel operation type quick tunneling support system and construction method Download PDFInfo
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- CN106050284A CN106050284A CN201610557938.2A CN201610557938A CN106050284A CN 106050284 A CN106050284 A CN 106050284A CN 201610557938 A CN201610557938 A CN 201610557938A CN 106050284 A CN106050284 A CN 106050284A
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- 238000010276 construction Methods 0.000 title claims abstract description 12
- 230000005641 tunneling Effects 0.000 title claims abstract description 9
- 230000008093 supporting effect Effects 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims description 17
- 210000003141 lower extremity Anatomy 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 7
- 230000007774 longterm Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 4
- 238000005065 mining Methods 0.000 abstract description 4
- 230000032258 transport Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003028 elevating effect Effects 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/0418—Positioning devices and stabilizing means for the props
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a parallel operation type quick tunneling support system which comprises a tunnel boring machine and a plurality of support frames. The parallel operation type quick tunneling support system is characterized in that the tunnel boring machine is provided with a transporter which is composed of a rack, a front adjusting beam and a rear adjusting beam, parallel conveying chains are arranged on the two sides of the rack, a guide groove is formed in the center of the rack, one end of the front adjusting beam and one end of the rear adjusting beam are hinged to different bases located in the guide groove correspondingly, and beam supporting devices are arranged at the other end of front adjusting beam and the other end of the rear adjusting beam. A construction method of the parallel operation type quick tunneling support system includes the step a of dismounting the support frames, the step b of placing the support frames, the step c of conveying the support frames, the step d of taking the support frames, the step e of mounting the support frames, and the step of of conducting anchor bolt support. According to the tunneling support system and the construction method, hydraulic pressure station legs adopt active support and have a better supporting effect compared with a passive support mode, and safe production is ensured; and meanwhile, an anchor bolt operation drill carriage operates at the rear of the tunnel boring machine, so that parallel operation of tunneling and anchor bolt support is achieved, and coal mining efficiency is remarkably improved.
Description
Technical field
The present invention relates to the driving support system in a kind of process of coal mining and construction method, in particular, especially
Relate to a kind of parallel operations formula speedy drivage support system and construction method.
Background technology
The gib form that domestic colliery commonly uses at present is to alter pipe forestope and pillar adds crossbeam two ways.This
The problems such as it is longer that both of which also exists support time, and labor strength is big, all drastically influence pick when building supporting
Entering efficiency, maximum problem is still to have safe weak link.Forestope and pillar add crossbeam and are passive support, without actively propping up
Support force, workman's construction is in empty top zone, once presses, it is impossible to effectively support, brings great hidden danger to safety in production.
Current domestic existing hydraulic pressure temporary support device, relies on development machine to install and use, but in use
Cannot be carried out parallel operations, although improve the speed of gib, but driving, driving speed must be stopped when anchor pole operation
Improving is not clearly.Such as Patent No. CN201410445368.9, invention entitled " a kind of driving support system and tunnel are propped up
Maintaining method " patent documentation, disclose a kind of driving support system, its by development machine, elevating conveyor, track, mobile reprint dolly,
Support forms, and track is arranged on development machine and elevating conveyor, and mobile dolly of reprinting can move forward and backward in orbit, in order to by rear end
The transporting bracket of gantry shape to front end, in order to along with the driving of development machine realizes uninterrupted supporting.But this driving supporting
System, must stop driving when suspension roof support, it is impossible to realizes the parallel operations of driving and suspension roof support, reduces opening of colliery
Adopt efficiency.
Summary of the invention
The present invention is for the shortcoming overcoming above-mentioned technical problem, it is provided that a kind of parallel operations formula speedy drivage support system
And construction method.
The parallel operations formula speedy drivage support system of the present invention, including the development machine and some to pick of digging laneway exploitation
Entering territory, rear empty top zone and carry out the support bracket of temporary support protection, support bracket is by crossbeam and the Hydraulic Station lower limb group being fixed on its two ends
Becoming, the two ends of crossbeam are scalable form；It is particular in that: is provided with on described development machine and is turned by the support bracket of rearmost end
Moving to conveying arrangement foremost, conveying arrangement is made up of frame, front tune beam and rear tune beam, and the both sides of frame are provided with the most flat
The transmission chain of row, frame is provided with and orders about the first driving means that driving chain rotates；The central authorities of frame offer guiding
Groove, front tune beam, rear one end adjusting beam be hingedly connected on the different bases that are positioned in gathering sill, and the other end is provided with and support bracket
The Bracket for supporting roof beam that matches of crossbeam, frame is provided with and orders about the second driving means that two bases move along gathering sill, frame
Two ends are fixed with before ordering about adjusts beam, the rear support cylinder adjusting beam lifting.
The parallel operations formula speedy drivage support system of the present invention, the rear end of described development machine is provided with anchor pole operation and bores
Car, anchor pole operation drill carriage is for piercing anchor pole, to realize the long-term supporting of tunnel roof and sidewall on the steel band of supported laneway.
The parallel operations formula speedy drivage support system of the present invention, the rear end of described development machine is provided with for by development machine
The front end transport vehicle that the colliery of exploitation transports, the rear end of front end transport vehicle is provided with the self-movable foot end formula transported further in colliery
Transporter.
The parallel operations formula speedy drivage support system of the present invention, described front tune beam and rear tune beam are stretched by beam body, one-level
Contracting bar and two grades of expansion links composition, the lower end of beam body is articulated with on base, upper end fix successively one-level expansion link, two grades stretch
Bar, Bracket for supporting roof beam is fixed on the end of two grades of expansion links, and Bracket for supporting roof beam is provided with opening up U-shaped bayonet socket.
The construction method of the parallel operations formula speedy drivage support system of the present invention, it is characterised in that pass through following steps
Realize:
A). dismounting support bracket, when development machine tunnel a segment distance need gib time, rear tune beam is stretched out by conveying arrangement, and
Bracket for supporting roof beam on rear tune beam is stuck on the crossbeam on support bracket, now, Hydraulic Station lower limb is shunk and is retracted in the two ends of crossbeam,
So that its width, height are respectively less than width and the height of remaining support bracket, in order to pass from remaining support bracket；B). place and prop up
Retaining frame, after support cylinder orders about, tune beam declines, and the second driving means adjusts the base of beam to move forward along gathering sill after ordering about simultaneously,
So that the support bracket on Bracket for supporting roof beam falls on transmission chain；C). transporting support bracket, the first driving means is ordered about driving chain and is turned
Dynamic, in order to the support bracket on transmission chain is transported to the front end of frame；D). take support bracket, before order, adjust beam to be in retracted mode,
Transmission chain is adjusted before being transported to by support bracket at the Bracket for supporting roof beam of beam, makes crossbeam snap in the U-shaped bayonet socket of Bracket for supporting roof beam, so that support bracket
Adjust on beam before being fixed on；E). installing support bracket, the second driving means adjusts the base of beam to move forward along gathering sill before ordering about, with
Time support cylinder order about before adjust beam rise, under the extension effect of front tune beam, make support bracket move to gib position, then
The crossbeam two ends first being ordered about support bracket by hydraulic system are overhanging, then order about the elongation of Hydraulic Station lower limb, to realize production zone
Gib；
In actual Bracing Process, once can shift one or more support brackets from rear end forward end, the quantity of its transfer is by digging
The distance length entering machine driving determines；When needs shift multiple support bracket, often one support bracket repeated execution of steps a) of transfer
To e)；
F). suspension roof support, either in development machine tunneling process, or during gib, anchor pole operation drill carriage all can enter
Row Anchor Care operation；First steel band is placed in the front or behind of last support bracket, then utilizes anchor pole operation drill carriage on steel band
Squeeze into anchor pole equally spacedly, to realize the long-term supporting to tunnel.
The invention has the beneficial effects as follows: the parallel operations formula speedy drivage support system of the present invention and construction method, driving
Arranging by conveying arrangement on machine, conveying arrangement is made up of, in the process shifting support bracket front tune beam, rear tune beam and transmission chain
In, the support bracket after the rear Bracket for supporting roof beam adjusted on beam will shrink is fixed, and is placed on transmission chain, by transmitting two by it
It is transported to the front end of frame；Then, the Bracket for supporting roof beam on front tune beam is fixed with support bracket, and by the extension of front tune beam by support bracket
It is placed into gib position, after the crossbeam of support bracket and the elongation of Hydraulic Station lower limb, gib can be completed.
Hydraulic Station lower limb is active support, and compared with active support, support effect more preferably, even if sky top, goaf is pressed,
Also the safety in goaf can be ensured, it is ensured that safety in production.Simultaneously as anchor pole operation drill carriage is at the rear work of development machine,
The driving of development machine and the gib operation of support bracket, all will not squeeze into anchor pole operation and cause operation drill carriage, it is achieved that
Driving and the parallel operations of suspension roof support, significantly improve coal mining efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the parallel operations formula speedy drivage support system of the present invention；
Fig. 2 is the fundamental diagram of parallel operations formula speedy drivage support system of the present invention；
Fig. 3 is the fundamental diagram of conveying arrangement in the present invention；
Structure chart when Fig. 4 is the front tune beam of conveying arrangement in the present invention, rear tune beam is in retracted mode；
Fig. 5 is the top view of conveying arrangement in the present invention.
In figure: 1 development machine, 2 support brackets, 3 conveying arrangements, 4 anchor pole operation drill carriages, 5 front end transporters, 6 self-movable foot end formulas
Transporter, 7 support brackets to be installed, 8 support brackets to be removed, 9 crossbeams, 10 Hydraulic Station lower limbs, 11 steel bands, 12 anchor poles, 13 frames, before 14
Adjusting beam, adjust beam, 16 integrated air ducts, 17 transmission chains, 18 first driving means, 19 bases, 20 beam body after 15,21 one-levels are stretched
Bar, 22 2 grades of expansion links, 23 Bracket for supporting roof beam, 24 U-shaped bayonet sockets, 25 support cylinders, 26 gathering sills.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As it is shown in figure 1, give the structural representation of the parallel operations formula speedy drivage support system of the present invention, it is by digging
Enter machine 1, support bracket 2, conveying arrangement 3, anchor pole operation drill carriage 4, front end transporter 5, self-movable foot end formula transporter 6 form, shown
Development machine 1 be used for exploiting colliery, front end transport vehicle 5 is positioned at the rear end of development machine 1, the colliery after exploited by development machine 1
Transport.Self-movable foot end formula transporter 6 is arranged at the rear end of front end transporter, for being transported further in colliery.Support bracket 2 is dragon
Door frame shape, it is arranged at the periphery of development machine 1 equally spacedly, to realize gib effect.Support bracket 2 is by crossbeam 9 and consolidates
Hydraulic Station lower limb 10 due to crossbeam 9 two ends forms, and the two ends of crossbeam 9 are scalable form, to regulate the width of support bracket 2；Liquid
Pressure station lower limb 10 is ordered about by hydraulic pressure and stretches, to realize support action.
As in figure 2 it is shown, give the fundamental diagram of parallel operations formula speedy drivage support system of the present invention, shown fortune
Defeated device 3 is positioned at the top of development machine 1, and the band dismounting support bracket 8 of rear end is transported to front end and carries out supporting by conveying arrangement 3, with
Constantly exploiting forward of development machine 1, by constantly the support bracket 2 of rear end is transferred to front end carries out supporting, it is achieved that to pick
Enter the gib in machine 1 goaf.Shown anchor pole operation drill carriage 4 is positioned at the rear end of development machine 1, and steel band 11 is placed in rearmost end
At support bracket 2, anchor pole operation drill carriage 4 is for squeezing into anchor pole 12 equally spacedly on steel band 11, long-time with realize tunnel
Supporting.
As it is shown on figure 3, give the fundamental diagram of conveying arrangement in the present invention, Fig. 4 gives the front tune of conveying arrangement
Beam, afterwards tune beam are in structure chart during retracted mode, if Fig. 4 is considered as front view, then Fig. 5 is corresponding top view；Shown in
Conveying arrangement 3 by frame 13, front tune beam 14, rear adjust beam 15, integrated air duct 16, transmission chain the 17, first driving means 18, the end
Seat 19, Bracket for supporting roof beam 23, support cylinder 25 form, and shown frame 13 is fixed and supporting role, and two transmission chains 17 are abreast
Being arranged at the both sides of frame 13, the first driving means 18 is ordered about transmission chain 17 and is rotated.The central authorities of frame 13 offer and lead
To groove 26, two bases 19 are respectively positioned in gathering sill 26.Front tune beam 14, the rear lower end adjusting beam 15 are hingedly connected on two bases 19,
Base 19 is ordered about by the second driving means, can move in gathering sill 26.Front tune beam 14, the afterwards end of tune beam 15 are the most fixing
Having Bracket for supporting roof beam 23, the top of Bracket for supporting roof beam 23 is U-shaped bayonet socket 24 upward, and the crossbeam 9 of support bracket 2 can snap in U-shaped bayonet socket 24, with
Realize support bracket 2 to be connected with front tune beam 14 or rear tune the fixing of beam 15.
Shown front tune beam 14 and rear tune beam 15 are formed by beam body 20, one-level expansion link 21 and two grades of expansion links 22, beam
The lower end of body 20 is articulated with on base 19, and one-level expansion link 21 and two grades of expansion links 22 are individually fixed in the upper end of beam body 20.Torr
Beam device 23 is fixed on the end of two grades of expansion links 22.The cylinder body of shown support cylinder 25 is fixed on base 19, support cylinder
The piston rod of 25 is fixed in beam body 20, flexible by support cylinder 25, adjust before can ordering about beam 14, rear adjust beam 15 to rise or under
Fall.
The construction method of the parallel operations formula speedy drivage support system of the present invention, is realized by following steps:
A). dismounting support bracket, when development machine tunnel a segment distance need gib time, rear tune beam is stretched out by conveying arrangement, and
Bracket for supporting roof beam on rear tune beam is stuck on the crossbeam on support bracket, now, Hydraulic Station lower limb is shunk and is retracted in the two ends of crossbeam,
So that its width, height are respectively less than width and the height of remaining support bracket, in order to pass from remaining support bracket；
B). placing support bracket, support cylinder adjusts beam to decline after ordering about, and the second driving means adjusts the base of beam along leading after ordering about simultaneously
Move forward to groove, so that the support bracket on Bracket for supporting roof beam falls on transmission chain；
C). transporting support bracket, the first driving means is ordered about driving chain and is rotated, in order to be transported to by the support bracket on transmission chain
The front end of frame；
D). taking support bracket, adjust beam to be in retracted mode before order, transmission chain is adjusted at the Bracket for supporting roof beam of beam before being transported to by support bracket,
Crossbeam is made to snap in the U-shaped bayonet socket of Bracket for supporting roof beam, so that support bracket is adjusted on beam before being fixed on；
E). installing support bracket, the second driving means adjusts the base of beam to move forward along gathering sill before ordering about, and support cylinder drives simultaneously
Adjust beam to rise before making, under the extension effect of front tune beam, make support bracket move to gib position, then pass through hydraulic system
The crossbeam two ends first ordering about support bracket are overhanging, then order about the elongation of Hydraulic Station lower limb, to realize the gib to production zone；
In actual Bracing Process, once can shift one or more support brackets from rear end forward end, the quantity of its transfer is by digging
The distance length entering machine driving determines；When needs shift multiple support bracket, often one support bracket repeated execution of steps a) of transfer
To e)；
F). suspension roof support, either in development machine tunneling process, or during gib, anchor pole operation drill carriage all can enter
Row Anchor Care operation；First steel band is placed in the front or behind of last support bracket, then utilizes anchor pole operation drill carriage on steel band
Squeeze into anchor pole equally spacedly, to realize the long-term supporting to tunnel.
The parallel operations formula speedy drivage support system of invention, Hydraulic Station lower limb is active support, and compared with active support,
Support effect more preferably, even if sky top, goaf is pressed, it is possible to ensure goaf safety, it is ensured that safety in production.Simultaneously as
Anchor pole operation drill carriage, all will not be to brill in the rear work of development machine, the driving of development machine and the gib operation of support bracket
The anchor pole operation of squeezing into of car causes operation, it is achieved that driving and the parallel operations of suspension roof support, significantly improves coal mining effect
Rate.
Claims (6)
1. a parallel operations formula speedy drivage support system, including the development machine (1) and some to driving of digging laneway exploitation
Territory, rear empty top zone carries out the support bracket (2) of temporary support protection, and support bracket is by crossbeam (9) and the Hydraulic Station lower limb that is fixed on its two ends
(10) composition, the two ends of crossbeam are scalable form；It is characterized in that: be provided with the support bracket of rearmost end on described development machine
(2) being transferred to conveying arrangement (3) foremost, conveying arrangement is made up of frame (13), front tune beam (14) and rear tune beam (15), machine
The both sides of frame are provided with the transmission chain (17) being parallel to each other, and frame is provided with and orders about the first driving dress that driving chain rotates
Put (18)；The central authorities of frame offer gathering sill (26), and front tune beam, rear one end adjusting beam are hingedly connected to be positioned in gathering sill
On different bases (19), the other end is provided with the Bracket for supporting roof beam (23) that the crossbeam with support bracket matches, and frame is provided with and orders about
The second driving means that two bases move along gathering sill, the two ends of frame are fixed with before ordering about adjusts beam, the rear support adjusting beam lifting
Oil cylinder (25).
Parallel operations formula speedy drivage support system the most according to claim 1, it is characterised in that: described development machine (1)
Rear end be provided with anchor pole operation drill carriage (4), anchor pole operation drill carriage is for piercing anchor pole on the steel band (11) of supported laneway
(12), to realize the long-term supporting of tunnel roof and sidewall.
Parallel operations formula speedy drivage support system the most according to claim 1 and 2, it is characterised in that: described development machine
(1) rear end is provided with the front end transport vehicle (5) for being transported in the colliery that development machine is exploited, and the rear end of front end transport vehicle is arranged
There is self-movable foot end formula transporter (6) transported further in colliery.
Parallel operations formula speedy drivage support system the most according to claim 1 and 2, it is characterised in that: adjust beam before described
(14) form by beam body (20), one-level expansion link (21) and two grades of expansion links (22) with rear tune beam (15), the lower end hinge of beam body
Being connected on base (19), upper end fixes one-level expansion link, two grades of expansion links successively, and Bracket for supporting roof beam (23) is fixed on two grades of expansion links
End, Bracket for supporting roof beam is provided with opening up U-shaped bayonet socket (24).
Parallel operations formula speedy drivage support system the most according to claim 1 and 2, it is characterised in that: described frame
(13) it is provided with on and realizes the integrated air duct (16) that development machine (1) front side ventilates with rear side.
6. a construction method based on the parallel operations formula speedy drivage support system described in claim 1, it is characterised in that
Realized by following steps:
A). dismounting support bracket, when development machine tunnel a segment distance need gib time, rear tune beam is stretched out by conveying arrangement, and
Bracket for supporting roof beam on rear tune beam is stuck on the crossbeam on support bracket, now, Hydraulic Station lower limb is shunk and is retracted in the two ends of crossbeam,
So that its width, height are respectively less than width and the height of remaining support bracket, in order to pass from remaining support bracket；
B). placing support bracket, support cylinder adjusts beam to decline after ordering about, and the second driving means adjusts the base of beam along leading after ordering about simultaneously
Move forward to groove, so that the support bracket on Bracket for supporting roof beam falls on transmission chain；
C). transporting support bracket, the first driving means is ordered about driving chain and is rotated, in order to be transported to by the support bracket on transmission chain
The front end of frame；
D). taking support bracket, adjust beam to be in retracted mode before order, transmission chain is adjusted at the Bracket for supporting roof beam of beam before being transported to by support bracket,
Crossbeam is made to snap in the U-shaped bayonet socket of Bracket for supporting roof beam, so that support bracket is adjusted on beam before being fixed on；
E). installing support bracket, the second driving means adjusts the base of beam to move forward along gathering sill before ordering about, and support cylinder drives simultaneously
Adjust beam to rise before making, under the extension effect of front tune beam, make support bracket move to gib position, then pass through hydraulic system
The crossbeam two ends first ordering about support bracket are overhanging, then order about the elongation of Hydraulic Station lower limb, to realize the gib to production zone；
In actual Bracing Process, once can shift one or more support brackets from rear end forward end, the quantity of its transfer is by digging
The distance length entering machine driving determines；When needs shift multiple support bracket, often one support bracket repeated execution of steps a) of transfer
To e)；
F). suspension roof support, either in development machine tunneling process, or during gib, anchor pole operation drill carriage all can enter
Row Anchor Care operation；First steel band is placed in the front or behind of last support bracket, then utilizes anchor pole operation drill carriage on steel band
Squeeze into anchor pole equally spacedly, to realize the long-term supporting to tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610557938.2A CN106050284A (en) | 2016-07-15 | 2016-07-15 | Parallel operation type quick tunneling support system and construction method |
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|---|---|---|---|
| CN201610557938.2A CN106050284A (en) | 2016-07-15 | 2016-07-15 | Parallel operation type quick tunneling support system and construction method |
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| CN201610557938.2A Pending CN106050284A (en) | 2016-07-15 | 2016-07-15 | Parallel operation type quick tunneling support system and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837334A (en) * | 2017-04-11 | 2017-06-13 | 中国矿业大学(北京) | A kind of full-mechanized roadway multi rack automatic moving type props up anchor combined machine set system |
| CN107178384A (en) * | 2017-07-17 | 2017-09-19 | 中煤能源研究院有限责任公司 | The advanced telescopic cantilever suspension device of tunnelling and its construction method |
| CN112253160A (en) * | 2020-10-28 | 2021-01-22 | 中国矿业大学(北京) | Complete equipment for quick tunneling, drilling and anchoring without repeated support under coal mine |
| CN114483073A (en) * | 2022-02-09 | 2022-05-13 | 张云雨 | Rapid roadway tunneling system and method for simultaneous tunneling and anchoring and protecting operation |
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