CN208252137U - Based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force - Google Patents
Based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force Download PDFInfo
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- CN208252137U CN208252137U CN201820680641.XU CN201820680641U CN208252137U CN 208252137 U CN208252137 U CN 208252137U CN 201820680641 U CN201820680641 U CN 201820680641U CN 208252137 U CN208252137 U CN 208252137U
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- top plate
- support system
- anchor cable
- force
- crossheading
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Abstract
The utility model discloses a kind of based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, the side side support system of side, and the pressure relief groove being provided on gate road bottom plate are helped including the roof timbering system for supporting gate road top plate and for supporting gate road two；Roof timbering system includes the short anchor cable of multiple top plates and absorption cell, and the short anchor cable of two neighboring top plate extended along gate road length direction is connected by top plate spill channel steel, opens up top plate pressure relief hole on top plate；Side side support system includes the short anchor cable in multiple side sides and absorption cell, and the two neighboring short anchor cable in side side laid along side side short transverse by side side spill channel steel connection, help to open up side side pressure relief vent on side by gate road two.The composite support system for principle, can effectively inhibit the overall deformation in tunnel with " unloading strong branch, damping energy-absorbing by force ", can reduce the injury to personnel and equipment when bump occurs, while effectively inhibiting the bottom distension in tunnel.
Description
Technical field
The utility model belongs to bump timbering technology in coal mine field, is specifically related to a kind of theoretical based on strong branch is unloaded by force
Bump coal mine rectangle crossheading composite support system.
Background technique
Currently, rock blast hazard has become and takes place frequently in buried high seam coal road recovery process and insoluble main disasters
Evil.Live a large amount of monitoring data show that under the influence of strong dynamic pressure, relaxation zone range has been more than anchor rod anchored range, cause majority
Anchor pole failure, can not provide good support action.Roadway deformation is violent, and wall caving bottom distension phenomenon is difficult to solve, traditional supporting
Means not can guarantee the safety in production of coal working face.This not only influences mining progress, but also usually threatens digging people
The safety of member and equipment.Therefore, it designs the new support system of one kind and guarantees that safe and efficient production is necessary.
Utility model content
The purpose of the utility model is to overcome above-mentioned deficiencies in the prior art, provide a kind of theoretical based on strong branch is unloaded by force
Bump coal mine rectangle crossheading composite support system.The composite support system with " unloading strong branch, damping energy-absorbing by force " be principle,
The overall deformation in tunnel can effectively be inhibited, the injury to personnel and equipment can be reduced when bump occurs, have simultaneously
Effect inhibits the bottom distension in tunnel.
In order to achieve the above purposes, the technical solution adopted by the utility model is: based on the bump for unloading strong branch theory by force
Coal mine rectangle crossheading composite support system, it is characterised in that: including the roof timbering system for supporting gate road top plate with
And absorption cell and side side support system and absorption cell that side is helped for supporting gate road two, and it is provided with gate road
Pressure relief groove on bottom plate；The roof timbering system includes the short anchor cable of multiple top plates for protruding into top plate, long along gate road
The short anchor cable of two neighboring top plate that degree direction extends is connected by top plate spill channel steel, offers top plate pressure relief on the top plate
Hole；The side side support system includes multiple short anchor cables in side side that side is helped for protruding into gate road two, along side height side of side
It is connected to the two neighboring short anchor cable in side side of laying by side side spill channel steel, the gate road two is helped to open up on side
There is side side pressure relief vent.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
The short anchor cable of multiple top plates extended along gate road width direction is connected by reinforcing connecting band.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
The reinforcement connecting band is W steel band of model.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
Top plate absorption cell is provided in the top plate spill channel steel, one end of the short anchor cable of top plate sequentially passes through top plate pallet, top plate
Absorption cell, top plate spill channel steel and reinforce connecting band and protrude into top plate, the top plate pallet far from the top plate absorption cell one
Side is provided with the short Anchor Cable Anchorage of top plate for applying pretightning force to the short anchor cable of the top plate.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
The top plate absorption cell is back wood.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
Side side absorption cell is provided in the spill channel steel of the side side, one end of the side short anchor cable in side sequentially passes through side side pallet, side side
Absorption cell and side side spill channel steel simultaneously protrude into side side, and the side side pallet is provided with far from the side of the side side absorption cell and is used for
Apply the short Anchor Cable Anchorage in side side of pretightning force to the short anchor cable in the side side.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
The side side absorption cell is back wood.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
The base angle of the gate road is provided with the pipe seam anchor bar for tilting down laying, is marked with cement slurry in the pipe seam anchor bar.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
The length of the short anchor cable of top plate and the side short anchor cable in side is 3m~5m.
It is above-mentioned based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that:
The drystone ashes for absorbing moisture is covered in the pressure relief groove, the pressure relief groove passes through cover closure；It is opened up on the cover board
There is the water for making thereon to fall into the drainage hole in pressure relief groove.
Compared with the prior art, the utility model has the following advantages:
1, the utility model composite support system is by tunneling boring cable bolting, effectively to inhibit the whole of tunnel to become
Shape, and by allow pressure release technological means, can effectively lay down pressure, avoid gate road top plate, side side and
Distension phenomenon in bottom occurs on bottom plate.
2, the utility model is by opening up pressure relief groove, can be under bump effect, and bottom distension caused by bottom plate is to unloading
It is moved in indent.
3, the utility model reinforces connecting band by setting, the short anchor cable of top plate effectively can be connected as entirety, rushed
When hitting low pressure generation, the short anchor cable of multiple top plates is enabled to carry out effective cooperative transformation, and then reduce the overall deformation in tunnel.
4, the utility model can not only quickly be absorbed in rock mass by setting top plate absorption cell and side side absorption cell
Harmful energy accomplishes effective damping energy-absorbing, additionally it is possible to which in addition the effective loss for reducing prestressd anchor cable can also impacted
Spill channel steel is avoided to cause damages pallet under load.
5, the utility model is top plate absorption cell by using back carpentery workshop, be effectively utilized the back good compression strength of wood and
The characteristics of compressible deformation energy-absorbing, therefore in bump generating process, back wood can step down release in time, quickly absorb
Harmful energy in rock mass, to alleviate the excessive pressure on support system, protection whole system is injury-free or destroys.
6, the utility model uses this short anchor cable, constructs more convenient, and can reach good anchoring effect.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
It, below will be to embodiment or existing in order to illustrate more clearly of the utility model or technical solution in the prior art
Attached drawing needed in technical description is briefly described, it should be apparent that, drawings discussed below is only that this is practical
Novel some embodiments for those skilled in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the plane artwork of the utility model roof timbering system.
Fig. 3 is the plane artwork that the utility model helps side support system.
Fig. 4 is the positional diagram of the utility model top plate absorption cell, top plate spill channel steel and top plate pallet.
Fig. 5 is that the utility model helps side absorption cell, side side spill channel steel and the positional diagram for helping side pallet.
Description of symbols:
1-gate road；1-1-top plate；1-2-side side；
1-3-bottom plate；2-pipe seam anchor bars；3-side short the anchor cables in side；
4-side side pressure relief vents；5-side side spill channel steels；6-top plate spill channel steels；
The short anchor cable of 7-top plates；8-top plate pressure relief holes；9-reinforce connecting band；
10-cover boards；101-drainage holes；11-pressure relief grooves；
12-drystone ashes；13-top plate pallets；The short Anchor Cable Anchorage of 14-top plates；
15-top plate absorption cells；16-side side absorption cells；17-side short the Anchor Cable Anchorages in side；
18-side side pallets.
Specific embodiment
Below in conjunction with the attached drawing in the utility model, the technical solution in the utility model is carried out clearly and completely
Description, it is clear that the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.It is based on
The embodiments of the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments are fallen within the protection scope of the utility model.
As shown in Figure 1, Figure 2 and Figure 3 is a kind of based on the bump coal mine rectangle crossheading composite support for unloading strong branch theory by force
Watch box system, the composite support system are theoretical based on strong branch is unloaded by force comprising the top plate for 1 top plate 1-1 of supporting gate road
Support system and the side side support system that side side 1-2 is helped for 1 liang of supporting gate road, and it is provided with 1 bottom plate of gate road
Pressure relief groove 11 on 1-3；The roof timbering system includes for protruding into the short anchor cable 7 of multiple top plates of top plate 1-1, along crossheading lane
The short anchor cable 7 of two neighboring top plate that 1 length direction of road extends is connected by top plate spill channel steel 6, is opened up on the top plate 1-1
There is top plate pressure relief hole 8；The side side support system includes multiple short anchors in side side for protruding into 1 liang of gate road side of side side 1-2
Rope 3, the short anchor cable 3 in two neighboring side side laid along side side 1-2 short transverse are described suitable by helping side spill channel steel 5 to be connected
Side side pressure relief vent 4 is offered on side of the side side 1-2 of 1 liang of slot tunnel.
In the present embodiment, the composite support system by roof timbering system for 1 top plate 1-1 of supporting gate road and
Side side support system for 1 liang of supporting gate road side of side side 1-2 constitutes tunneling boring cable bolting, this tunneling boring anchor cable branch
Shield can effectively inhibit the overall deformation in tunnel, and pass through setting top plate pressure relief hole 8 and side side pressure relief vent 4 and crossheading lane
Offer pressure relief groove 11 on the bottom plate 1-3 in road 1, can effectively lay down pressure, avoid gate road 1 top plate 1-1, side side
Distension phenomenon in bottom occurs on 1-2 and bottom plate 1-3, and by opening up pressure relief groove 11, can be under bump effect, bottom plate 1-3
Generated bottom distension is moved into pressure relief groove 11.
In the present embodiment, which for principle, can effectively inhibit the whole of tunnel to become with " unloading strong branch by force "
Shape can reduce the injury to personnel and equipment when bump occurs, while effectively inhibit the bottom distension in tunnel.
As shown in Figure 1, being connected along the short anchor cable 7 of multiple top plates that 1 width direction of gate road extends by reinforcing connecting band 9
It connects.
In the present embodiment, connecting band 9 is reinforced by setting, the short anchor cable 7 of top plate effectively can be connected as entirety, rushed
When hitting low pressure generation, the short anchor cable 7 of multiple top plates is enabled to carry out effective cooperative transformation, and then reduces the whole of tunnel and become
Shape.
In the present embodiment, the reinforcement connecting band 9 is W steel band of model.Using W steel band of model as reinforcement connecting band 9.
As shown in figure 4, top plate absorption cell 15 is provided in the top plate spill channel steel 6, one end of the short anchor cable 7 of top plate
It sequentially passes through top plate pallet 13, top plate absorption cell 15, top plate spill channel steel 6 and reinforces connecting band 9 and protrude into top plate 1-1, it is described
Top plate pallet 13 is provided with the top for applying pretightning force to the short anchor cable 7 of the top plate far from the side of the top plate absorption cell 15
The short Anchor Cable Anchorage 14 of plate.
In the present embodiment, by the way that top plate absorption cell 15 is arranged in top plate spill channel steel 6, the suction of top plate absorption cell 15 is utilized
Can feature, therefore in bump generating process, top plate absorption cell 15 can step down release in time, quickly absorb in rock mass
Harmful energy, to alleviate the excessive pressure on support system, protection whole system is injury-free or destroys.And due to passing
In the anchor cable beam of system, the real contact area very little of top plate pallet 13 and top plate spill channel steel 6, this combination causes to pre-tighten
The transmission effects of power is relatively low, and under irregular Impact Load, loss of prestress is obvious.On the other hand, top plate is recessed
It will form a big gap in shape channel steel 6 and top plate pallet 13, top plate 1-1 holds very much come two legs of top plate spill channel steel 6 when pressing
Easily top plate pallet 13 is caused to damage.It follows that can not only quickly be absorbed in rock mass by setting top plate absorption cell 15
Harmful energy, additionally it is possible to it is effective to reduce the prestressed loss of the short anchor cable 7 of top plate, in addition can also be avoided under impact load
Top plate spill channel steel 6 causes damages to top plate pallet 13.
In the present embodiment, the top plate absorption cell 15 is back wood.Since back is wooden with good compression strength and compressible
The characteristics of deforming energy-absorbing, therefore in bump generating process, back wood can step down release in time, quickly absorb in rock mass
Harmful energy, to alleviate the excessive pressure on support system, protection whole system is injury-free or destroys.
As shown in figure 5, side side absorption cell 16 is provided in side side spill channel steel 5, one end of the side short anchor cable 3 in side
It sequentially passes through side side pallet 18, side side absorption cell 16 and side side spill channel steel 5 and protrudes into side side 1-2, the side side pallet 18 is remote
Side from the side side absorption cell 16 is provided with the short Anchor Cable Anchorage in side side for applying pretightning force to the short anchor cable 3 in the side side
17。
Top plate absorption cell 15 is set similarly in top plate spill channel steel 6, in the present embodiment, by side side spill channel steel
It is provided with side side absorption cell 16 in 5, can not only quickly absorb harmful energy in rock mass, additionally it is possible to is effective to reduce side side
In addition the prestressed loss of short anchor cable 3 can also avoid side 5 pairs of side side pallets 18 of side spill channel steel from causing to damage under impact load
It loses.
In the present embodiment, the side side absorption cell 16 is back wood.It is also with the good compression strength of back wood and can
The characteristics of compressive deformation energy-absorbing, therefore in bump generating process, back wood can step down release in time, quickly absorb rock
Harmful energy in body, to alleviate the excessive pressure on support system, protection whole system is injury-free or destroys.
In the present embodiment, roof timbering system is not only passed through by the composite support system and side side support system is constituted entirely
Section cable bolting, to play the purpose of strong supporting, and by top plate pressure relief hole 8 and side side pressure relief vent 4 and it is set by
Top plate absorption cell 15 made of back wood helps side absorption cell 16 to carry out effective damping energy-absorbing, thus reach it is effective " unload by force strong branch,
The purpose of damping energy-absorbing " realizes effective combination of strong supporting and damping energy-absorbing, and then effectively inhibits the overall deformation in tunnel, energy
When bump occurs, the injury to personnel and equipment is reduced, while effectively inhibiting the bottom distension in tunnel.
As shown in Figure 1, the base angle of the gate road 1 is provided with the pipe seam anchor bar 2 for tilting down laying, the pipe seam anchor
Cement slurry is marked in bar 2.The pipe seam anchor bar 2 of laying is tilted down by being arranged, the level that can effectively reduce bottom plate 1-3 is answered
Power, and by increasing wall-rock crack in bottom hole explosion emission levels stress, and then strengthen the slip casting effect of cement slurry.
In the present embodiment, the length of the short anchor cable 7 of top plate and the side short anchor cable 3 in side is 3m~5m.Using this
Short anchor cable constructs more convenient, and can reach good anchoring effect.
As shown in Figure 1, being covered with the drystone ashes 12 for absorbing moisture in the pressure relief groove 11, the pressure relief groove 11 passes through
Cover board 10 is closed, and the drainage hole 101 that the water for making thereon is fallen into pressure relief groove 11 is offered on the cover board 10.
In the present embodiment, by uniformly spreading the drystone ashes 12 of one layer of 100mm thickness in pressure relief groove 11 and being compacted, such energy
Completely cut off the moisture in 11 slot bottom of pressure relief groove and air, to keep the drying of pressure relief groove 11, and passes through cover board 10 for pressure relief groove 11
Closing, thus facilitate going together for people and equipment, in addition, by opening up drainage hole 101 on cover board 10, and then cover board 10 can be made
On moisture fall into pressure relief groove 11, it is ensured that the drying of cover board 10.
In the present embodiment, which specifically follows the steps below in construction:
Firstly, carrying out tunneling boring cable bolting.Every two anchor cables are using a spill channel steel connection, it may be assumed that two top plates are short
Anchor cable 7 is connected by top plate spill channel steel 6, and two side short anchor cables 3 in side are by helping side spill channel steel 5 to be connected, wherein top plate
Short anchor cable 7 passes through W fashioned iron band connection, wherein is put into back wood in top plate spill channel steel 6 and side side spill channel steel 5, carries on the back the lower peace of wood
High strength pallet is set, pretightning force is fixed by anchorage and applied to last short anchor cable, and pretightning force is not less than 200Kn.
Then, in the side of top plate 1-1 and two, side 1-2 beats pressure relief vent.It is bored and is punched using φ 42, hole depth is not less than 3500mm.
Next, tunnel base angle two sides carry out locking angle anchor bolt construction.Specific construction sequence are as follows: punching, bottom hole explosion, installation
Pipe seam anchor bar 2 and slip casting.Wherein, the first step is punching, is bored and is punched using φ 42, and hole depth is not less than 3500mm.Second step is hole
Bottom explosion, each hole carry out bottom hole explosion with a roll of mining emulsion.Third step is installation pipe seam anchor bar 2 and slip casting, will be managed
Seam anchor pole 2 is installed in the hole after explosion, and carries out slip casting with grouting pump, and the ratio of mud of cement slurry, which is controlled 0.5-0.7, is
Preferably.
Finally, the bottom plate 1-3 of gate road 1 starts discharging indent 11 again.Pressure relief groove 11 is excavated, mode of grooving is using pneumatic pick
The method loosen, manually slagged tap.Such as occurs ponding in work progress, it is necessary to water be discharged immediately, moist quarrel stone is removed.It unloads
After the completion of indent 11, uniformly spreads one layer of 100mm drystone ashes 12 and be compacted, cover board 10, cover board are finally covered on pressure relief groove 11
Drainage hole 101 should be beaten on 10 in order to drain.
The above is only the preferred embodiment of the utility model, not imposes any restrictions to the utility model, all
According to the utility model technical spirit any simple modification, change and equivalent structure transformation to the above embodiments, still
Belong in the protection scope of technical solutions of the utility model.
Claims (10)
1. based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force, it is characterised in that: including being used for
The roof timbering system of supporting gate road (1) top plate (1-1) and the side that side (1-2) is helped for supporting gate road (1) two
Side support system, and the pressure relief groove (11) being provided on gate road (1) bottom plate (1-3)；The roof timbering system includes
For protruding into the short anchor cable of multiple top plates (7) of top plate (1-1), along the two neighboring top plate of gate road (1) length direction extension
Short anchor cable (7) is connected by top plate spill channel steel (6), offers top plate pressure relief hole (8) on the top plate (1-1)；The side
Side support system includes multiple short anchor cables in side side (3) that side (1-2) is helped for protruding into gate road (1) two, along side side (1-2)
The two neighboring short anchor cable in side side (3) that short transverse is laid is by helping side spill channel steel (5) to be connected, the gate road (1)
Side side pressure relief vent (4) is offered in two sides side (1-2).
2. it is according to claim 1 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: being connected along the short anchor cable of multiple top plates (7) that gate road (1) width direction extends by reinforcing connecting band (9)
It connects.
3. it is according to claim 2 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: the reinforcement connecting band (9) is W steel band of model.
4. it is according to claim 2 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: being provided with top plate absorption cell (15) in the top plate spill channel steel (6), one end of the short anchor cable of top plate (7)
It sequentially passes through top plate pallet (13), top plate absorption cell (15), top plate spill channel steel (6) and reinforces connecting band (9) and protrude into top plate
(1-1), the top plate pallet (13) are provided with far from the side of the top plate absorption cell (15) for the short anchor cable of the top plate
(7) apply the short Anchor Cable Anchorage of top plate (14) of pretightning force.
5. it is according to claim 4 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: the top plate absorption cell (15) is back wood.
6. it is according to claim 1 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: side side absorption cell (16) is provided in the side side spill channel steel (5), one end of the side short anchor cable in side (3)
It sequentially passes through side side pallet (18), side side absorption cell (16) and side side spill channel steel (5) and protrudes into side side (1-2), the side side
Pallet (18) is provided with far from the side of side side absorption cell (16) for applying pretightning force to the side short anchor cable in side (3)
It helps the short Anchor Cable Anchorage in side (17).
7. it is according to claim 6 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: the side side absorption cell (16) is back wood.
8. it is according to claim 1 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: the base angle of the gate road (1) is provided with the pipe seam anchor bar (2) for tilting down laying, the pipe seam anchor bar
(2) cement slurry is marked in.
9. it is according to claim 1 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: the length of the short anchor cable of top plate (7) and the side short anchor cable in side (3) is 3m~5m.
10. it is according to claim 1 based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force,
It is characterized by: being covered with the drystone ashes (12) for absorbing moisture in the pressure relief groove (11), the pressure relief groove (11) passes through
Cover board (10) closing；The drainage hole (101) that the water for making thereon is fallen into pressure relief groove (11) is offered on the cover board (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820680641.XU CN208252137U (en) | 2018-05-08 | 2018-05-08 | Based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820680641.XU CN208252137U (en) | 2018-05-08 | 2018-05-08 | Based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force |
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| Publication Number | Publication Date |
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| CN208252137U true CN208252137U (en) | 2018-12-18 |
Family
ID=64635075
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820680641.XU Expired - Fee Related CN208252137U (en) | 2018-05-08 | 2018-05-08 | Based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108397218A (en) * | 2018-05-08 | 2018-08-14 | 西安科技大学 | Based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force |
| CN111379580A (en) * | 2020-03-18 | 2020-07-07 | 中铁十六局集团第三工程有限公司 | Tunnel primary support protection construction method |
-
2018
- 2018-05-08 CN CN201820680641.XU patent/CN208252137U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108397218A (en) * | 2018-05-08 | 2018-08-14 | 西安科技大学 | Based on the bump coal mine rectangle crossheading composite support system for unloading strong branch theory by force |
| CN111379580A (en) * | 2020-03-18 | 2020-07-07 | 中铁十六局集团第三工程有限公司 | Tunnel primary support protection construction method |
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Granted publication date: 20181218 |