CN109098736A - A kind of tunnel support device that stability is high - Google Patents
A kind of tunnel support device that stability is high Download PDFInfo
- Publication number
- CN109098736A CN109098736A CN201811180826.5A CN201811180826A CN109098736A CN 109098736 A CN109098736 A CN 109098736A CN 201811180826 A CN201811180826 A CN 201811180826A CN 109098736 A CN109098736 A CN 109098736A
- Authority
- CN
- China
- Prior art keywords
- support bracket
- gate support
- ground pile
- arching frame
- support device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 16
- 239000010962 carbon steel Substances 0.000 claims abstract description 16
- 238000013016 damping Methods 0.000 claims abstract description 13
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 12
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 12
- 206010058109 Hangnail Diseases 0.000 claims abstract description 6
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 239000002689 soil Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229960004424 carbon dioxide Drugs 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/30—Bases for lower arch members
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a kind of tunnel support devices that stability is high, including gate support bracket, arching frame, carbonomonoxide concentration sensor and carbon steel enhancement layer, the arching frame side wall is internally provided with carbon steel enhancement layer, and polytetrafluoroethylene (PTFE) anti-corrosion layer is provided on the outside of arching frame, central position inside the arching frame is provided with gate support bracket, and hydraulic jack is uniformly fixed between gate support bracket and arching frame, the output end of the carbonomonoxide concentration sensor is electrically connected by the input terminal of conducting wire and single-chip microcontroller, and the output end of single-chip microcontroller is electrically connected by the input terminal of conducting wire and buzzer siren.The high tunnel support device of the stability, is equipped with mounting seat, the first ground pile, the second ground pile and damping spring, so that hangnail is provided on the first ground pile and the second ground pile convenient for will deeply be fixed among soil layer, so that insertion is deeper, it is not easy to collapse.
Description
Technical field
The present invention relates to suspension device technical field, specially a kind of tunnel support device that stability is high.
Background technique
Tunnel is the engineering works being embedded in stratum, is a kind of form of human use's underground space, and tunnel can divide
For traffic tunnel, Hydraulic Tunnel, municipal tunnel, mining tunnel, the structure in tunnel includes main building object and auxiliary device two
Point, main building object is made of barrel and portal, and auxiliary device includes that refuge chamber, fire fighting device, emergency communication and guarded drainage are set
It applies, there are also special ventilation and lighting apparatus for major long tunnel, and the excavation disturbance in tunnel can cause biggish surrouding rock deformation, if supporting
Measure is not in place, and surrouding rock deformation can exceed that its permissible range, and Tunnel Landslide can be caused when serious, causes heavy economic losses,
The most structure of tunnel support device at this stage is simple, has a single function, and fixed installation is not secured enough, and stability is not high, and
Do not have the shockproof function of damping, is easy to collapse, it is inconvenient for use, while such device does not have the function of detection carbonomonoxide concentration
Can, worker constructs in tunnel internal for a long time, it is easy to which anoxic influences health, while the structure of such device is strong
Spend bad with compressive property, service life is shorter, therefore is badly in need of a kind of tunnel support device that stability is high to meet people's
Demand.
Summary of the invention
The purpose of the present invention is to provide a kind of tunnel support devices that stability is high, to solve to mention in above-mentioned background technique
Existing tunnel support device stability out is not high, does not have the function of damping, can not detect carbonomonoxide concentration in tunnel
And the structural strength of device itself and the bad problem of compressive property.
To achieve the above object, the invention provides the following technical scheme: a kind of tunnel support device that stability is high, including
Gate support bracket, arching frame, carbonomonoxide concentration sensor and carbon steel enhancement layer, the inside of the arching frame side wall
It is provided with carbon steel enhancement layer, and is provided with polytetrafluoroethylene (PTFE) anti-corrosion layer on the outside of arching frame, in the arching frame
The central position in portion is provided with gate support bracket, and is uniformly fixed with hydraulic jack between gate support bracket and arching frame
Top, the top of the gate support bracket is provided with single-chip microcontroller, and the two sides inside gate support bracket are respectively and fixedly provided with camera, described
Top inside gate support bracket is fixed with carbonomonoxide concentration sensor, and the side of carbonomonoxide concentration sensor is provided with
Buzzer siren, the both ends of gate support bracket bottom are respectively and fixedly provided with stop sleeve, and stop sleeve is close to arching frame
The bottom end of side passes through haulage cable and is provided with the first ground pile, and the bottom end of the stop sleeve is respectively and fixedly provided with mounting seat,
And the bottom end of mounting seat is respectively and fixedly provided with the second ground pile, is provided with hangnail on second ground pile and the first ground pile, described one
The output end of carbonoxide concentration sensor is electrically connected by the input terminal of conducting wire and single-chip microcontroller, and the output end of single-chip microcontroller passes through
The input terminal of conducting wire and buzzer siren is electrically connected.
Preferably, the both ends of gate support bracket bottom are evenly arranged with screw hole, are provided on the stop sleeve
Bolt is adjusted, and adjusts bolt and screw hole mutual cooperation, the gate support bracket and stop sleeve constitute telescoping mechanism.
Preferably, it is provided with skewed horizontal load bar on the gate support bracket above the camera, and skewed horizontal load bar is equal
Both ends with gate support bracket for gate support bracket bottom described in weldedization structure are evenly arranged with screw hole, the support sleeve
It is provided with adjusting bolt on cylinder, and adjusts bolt and screw hole mutual cooperation, the gate support bracket is stretched with stop sleeve composition
Contracting mechanism.
Preferably, the inside spaced set of the mounting seat has damping spring, and the edge of mounting seat is solid
Surely there is fixing bolt.
Preferably, the inside of the carbon steel enhancement layer is evenly arranged with reinforcing rib, and reinforcing rib is in dies.
Preferably, the two sides of the carbon steel enhancement layer are provided with rubber resistance to compression layer, and the longitudinal section of rubber resistance to compression layer is in
It is semicircular arc-shaped.
Compared with prior art, the beneficial effects of the present invention are: the high tunnel support device of the stability is by being equipped with
Mounting seat, the first ground pile, the second ground pile and damping spring, so that convenient for will deeply be fixed among soil layer, the first ground pile
It is provided with hangnail on the second ground pile, so that insertion is deeper, it is not easy to collapse, the damping spring in mounting seat plays damping
Shockproof effect, so that stability is higher, while device is by being equipped with arching frame and gate support bracket, in arch branch
Hydraulic jack is uniformly fixed between retaining frame and gate support bracket, hydraulic jack can bear the pressure from each face, double
Supporting is protected again, be can effectively prevent tunnel and is collapsed accidentally, while device is by being internally provided with carbon in arching frame side wall
Steel enhancement layer and rubber resistance to compression layer, so that convenient for improving the structural strength and compressive property of device, it is not easy to damage, same to fashionable dress
It sets by being equipped with carbonomonoxide concentration sensor, single-chip microcontroller and buzzer siren, so that convenient for the oxygen in monitoring tunnel
Change concentration of carbon, avoids worker from causing anoxic in interior construction for a long time, unhealthful, safety greatly improves.
Detailed description of the invention
Fig. 1 is that the present invention faces the schematic diagram of the section structure；
Fig. 2 is stop sleeve the schematic diagram of the section structure of the present invention；
Fig. 3 is mounting seat the schematic diagram of the section structure of the present invention；
Fig. 4 is arching frame sidewall profile structural schematic diagram of the present invention.
In figure: 1, the first ground pile；2, haulage cable；3, stop sleeve；4, gate support bracket；5, camera；6, arch
Support bracket；7, carbonomonoxide concentration sensor；8, single-chip microcontroller；9, buzzer siren；10, skewed horizontal load bar；11, hydraulic jack
Top；12, bolt is adjusted；13, mounting seat；14, the second ground pile；15, screw hole；16, fixing bolt；17, damping spring；18, it falls
Thorn；19, polytetrafluoroethylene (PTFE) anti-corrosion layer；20, rubber resistance to compression layer；21, carbon steel enhancement layer；22, reinforcing rib.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the present invention provides a kind of technical solution: a kind of tunnel support device that stability is high, including door
Type support bracket 4, arching frame 6, carbonomonoxide concentration sensor 7 and carbon steel enhancement layer 21, the inside of 6 side wall of arching frame
It is provided with carbon steel enhancement layer 21, the inside of carbon steel enhancement layer 21 is evenly arranged with reinforcing rib 22, and reinforcing rib 22 is in " I " fonts
Structure, improves the structural strength of device, and the two sides of carbon steel enhancement layer 21 are provided with rubber resistance to compression layer 20, and rubber resistance to compression layer 20
Longitudinal section it is semicircular arc, increase the compressive property of device, be unlikely to deform damage, and the outside of arching frame 6 is provided with
Polytetrafluoroethylene (PTFE) anti-corrosion layer 19, the central position inside arching frame 6 are provided with gate support bracket 4, and gate supporting
Hydraulic jack 11 is uniformly fixed between frame 4 and arching frame 6, the top of gate support bracket 4 is provided with single-chip microcontroller 8, single
The model of piece machine 8 can be ZYWYKJ, and the two sides inside gate support bracket 4 are respectively and fixedly provided with camera 5, the door of 5 top of camera
Skewed horizontal load bar 10 is provided on type support bracket 4, and skewed horizontal load bar 10 is weldedization knot with gate support bracket 4
Structure increases the stability of device, and the top inside gate support bracket 4 is fixed with carbonomonoxide concentration sensor 7, and carbon monoxide is dense
The model for spending sensor 7 can be TGS2442, and the side of carbonomonoxide concentration sensor 7 is provided with buzzer siren 9, buzzing
The model of alarm 9 can be QZBJ-260, and the both ends of 4 bottom of gate support bracket are respectively and fixedly provided with stop sleeve 3, gate support bracket 4
The both ends of bottom are evenly arranged with screw hole 15, are provided on stop sleeve 3 and adjust bolt 12, and adjust bolt 12 and screw hole 15
It cooperates, gate support bracket 4 and stop sleeve 3 constitute telescoping mechanism, convenient for adjusting the height of gate support bracket 4, convenient for full
The different supporting demand of foot, and stop sleeve 3 passes through haulage cable 2 close to the bottom end of 6 side of arching frame and is provided with
First ground pile 1, the bottom end of stop sleeve 3 are respectively and fixedly provided with mounting seat 13, and the inside spaced set of mounting seat 13 has damping
Spring 17, and the edge of mounting seat 13 is respectively and fixedly provided with fixing bolt 16, convenient for being fixedly mounted and dismantling, while playing damping
Shockproof effect, and the bottom end of mounting seat 13 is respectively and fixedly provided with the second ground pile 14, is respectively provided on the second ground pile 14 and the first ground pile 1
There is hangnail 18, the output end of carbonomonoxide concentration sensor 7 is electrically connected by the input terminal of conducting wire and single-chip microcontroller 8, and monolithic
The output end of machine 8 is electrically connected by the input terminal of conducting wire and buzzer siren 9.
Working principle: when in use, pass through first of 3 side of the second ground pile 14 and stop sleeve in mounting seat 13
Ground pile 1 is inserted among the soil layer in tunnel, is provided with hangnail 18 on the first ground pile 1 and the second ground pile 14, so that insertion is more deepened
Enter, fixed more firm, the damping spring 17 in mounting seat 13 plays the shockproof effect of damping, guarantees stability, Zhi Houzai
By 16 fixing compact of fixing bolt, hydraulic jack 11 is uniformly fixed between arching frame 6 and gate support bracket 4,
The pressure from each face can be born, dual supporting protection can effectively prevent tunnel and collapse accidentally, in 6 side wall of arching frame
Be internally provided with carbon steel enhancement layer 21 and rubber resistance to compression layer 20 so that convenient for improve device structural strength and crushing resistance
It can, it is not easy to it damages, the outside of arching frame 6 is additionally provided with polytetrafluoroethylene (PTFE) anti-corrosion layer 19, it addles convenient for preventing from getting rusty,
The carbonomonoxide concentration situation of tunnel internal can be monitored in real time in carbonomonoxide concentration sensor 7 in gate support bracket 4, dense
Signal is passed into single-chip microcontroller 8 when spending exceeded, controls 9 warning note construction personnel of buzzer siren later, guarantees construction personnel
Safety, camera 5 convenient for real time monitoring constructing tunnel situation, it is easy to use.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of tunnel support device that stability is high, including gate support bracket (4), arching frame (6), carbonomonoxide concentration
Sensor (7) and carbon steel enhancement layer (21), it is characterised in that: the carbon steel that is internally provided with of arching frame (6) side wall adds
Strong layer (21), and polytetrafluoroethylene (PTFE) anti-corrosion layer (19) are provided on the outside of arching frame (6), the arching frame (6)
Internal central position is provided with gate support bracket (4), and uniformly solid between gate support bracket (4) and arching frame (6)
Surely have hydraulic jack (11), the top of the gate support bracket (4) is provided with single-chip microcontroller (8), and gate support bracket (4) is internal
Two sides be respectively and fixedly provided with camera (5), the internal top of the gate support bracket (4) is fixed with carbonomonoxide concentration sensor
(7), and the side of carbonomonoxide concentration sensor (7) is provided with buzzer siren (9), gate support bracket (4) bottom
Both ends are respectively and fixedly provided with stop sleeve (3), and stop sleeve (3) passes through traction steel close to the bottom end of arching frame (6) side
Cord (2) is provided with the first ground pile (1), and the bottom end of the stop sleeve (3) is respectively and fixedly provided with mounting seat (13), and mounting seat
(13) bottom end is respectively and fixedly provided with the second ground pile (14), is provided with hangnail on second ground pile (14) and the first ground pile (1)
(18), the output end of the carbonomonoxide concentration sensor (7) is electrically connected by conducting wire and the input terminal of single-chip microcontroller (8), and
The output end of single-chip microcontroller (8) is electrically connected by conducting wire and the input terminal of buzzer siren (9).
2. a kind of high tunnel support device of stability according to claim 1, it is characterised in that: the gate support bracket
(4) both ends of bottom are evenly arranged with screw hole (15), are provided on the stop sleeve (3) and are adjusted bolt (12), and are adjusted
Bolt (12) and screw hole (15) cooperate, and the gate support bracket (4) and stop sleeve (3) constitute telescoping mechanism.
3. a kind of high tunnel support device of stability according to claim 1, it is characterised in that: the camera (5)
Be provided with skewed horizontal load bar (10) on the gate support bracket (4) of top, and skewed horizontal load bar (10) with gate support bracket (4)
For weldedization structure.
4. a kind of high tunnel support device of stability according to claim 1, it is characterised in that: the mounting seat
(13) inside spaced set has damping spring (17), and the edge of mounting seat (13) is respectively and fixedly provided with fixing bolt
(16)。
5. a kind of high tunnel support device of stability according to claim 1, it is characterised in that: the carbon steel enhancement layer
(21) inside is evenly arranged with reinforcing rib (22), and reinforcing rib (22) is in dies.
6. a kind of high tunnel support device of stability according to claim 1, it is characterised in that: the carbon steel enhancement layer
(21) two sides are provided with rubber resistance to compression layer (20), and the longitudinal section of rubber resistance to compression layer (20) is semicircular arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811180826.5A CN109098736A (en) | 2018-10-10 | 2018-10-10 | A kind of tunnel support device that stability is high |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811180826.5A CN109098736A (en) | 2018-10-10 | 2018-10-10 | A kind of tunnel support device that stability is high |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109098736A true CN109098736A (en) | 2018-12-28 |
Family
ID=64868444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811180826.5A Pending CN109098736A (en) | 2018-10-10 | 2018-10-10 | A kind of tunnel support device that stability is high |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109098736A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145342A (en) * | 2019-06-06 | 2019-08-20 | 河北省交通规划设计院 | A kind of tunnel support device that stability is high |
| CN114046161A (en) * | 2021-12-09 | 2022-02-15 | 中铁十六局集团有限公司 | Safety maintenance shock absorption protection system for tunnel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04323500A (en) * | 1991-01-17 | 1992-11-12 | Ishikawajima Constr Materials Co Ltd | Lining method for tunnel and lining frame |
| CN201826854U (en) * | 2010-05-14 | 2011-05-11 | 池州恒毅设备制造有限公司 | Concrete lining steel mould trolley lifting device |
| CN104316105A (en) * | 2014-10-14 | 2015-01-28 | 苏州德鲁森自动化***有限公司 | Tunnel environment monitoring system |
| CN105317439A (en) * | 2014-07-17 | 2016-02-10 | 粤水电轨道交通建设有限公司 | Rail type adjustable and comprehensive trolley for tunnel section |
| CN207795286U (en) * | 2018-01-29 | 2018-08-31 | 裴春敏 | A kind of temporary supporter for mine tunnel |
| CN108798722A (en) * | 2018-06-04 | 2018-11-13 | 郑州工程技术学院 | A kind of roadway support concrete steel pipe support frame device and method for supporting |
-
2018
- 2018-10-10 CN CN201811180826.5A patent/CN109098736A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04323500A (en) * | 1991-01-17 | 1992-11-12 | Ishikawajima Constr Materials Co Ltd | Lining method for tunnel and lining frame |
| CN201826854U (en) * | 2010-05-14 | 2011-05-11 | 池州恒毅设备制造有限公司 | Concrete lining steel mould trolley lifting device |
| CN105317439A (en) * | 2014-07-17 | 2016-02-10 | 粤水电轨道交通建设有限公司 | Rail type adjustable and comprehensive trolley for tunnel section |
| CN104316105A (en) * | 2014-10-14 | 2015-01-28 | 苏州德鲁森自动化***有限公司 | Tunnel environment monitoring system |
| CN207795286U (en) * | 2018-01-29 | 2018-08-31 | 裴春敏 | A kind of temporary supporter for mine tunnel |
| CN108798722A (en) * | 2018-06-04 | 2018-11-13 | 郑州工程技术学院 | A kind of roadway support concrete steel pipe support frame device and method for supporting |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145342A (en) * | 2019-06-06 | 2019-08-20 | 河北省交通规划设计院 | A kind of tunnel support device that stability is high |
| CN114046161A (en) * | 2021-12-09 | 2022-02-15 | 中铁十六局集团有限公司 | Safety maintenance shock absorption protection system for tunnel |
| CN114046161B (en) * | 2021-12-09 | 2023-05-16 | 中铁十六局集团有限公司 | A safety maintenance shock attenuation protection system for tunnel |
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| PB01 | Publication | ||
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Application publication date: 20181228 |