CN111139756A - High-energy-level protection steel shed tunnel suitable for mountainous area arbitrary terrain - Google Patents
High-energy-level protection steel shed tunnel suitable for mountainous area arbitrary terrain Download PDFInfo
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- CN111139756A CN111139756A CN202010032210.4A CN202010032210A CN111139756A CN 111139756 A CN111139756 A CN 111139756A CN 202010032210 A CN202010032210 A CN 202010032210A CN 111139756 A CN111139756 A CN 111139756A
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- steel shed
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F7/00—Devices affording protection against snow, sand drifts, side-wind effects, snowslides, avalanches or falling rocks; Anti-dazzle arrangements ; Sight-screens for roads, e.g. to mask accident site
- E01F7/04—Devices affording protection against snowslides, avalanches or falling rocks, e.g. avalanche preventing structures, galleries
- E01F7/045—Devices specially adapted for protecting against falling rocks, e.g. galleries, nets, rock traps
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- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a high-energy-level protection steel shed tunnel suitable for any landform in a mountainous area, which comprises a steel shed tunnel body, wherein a rotary support is arranged on the top plate of the steel shed tunnel body close to the mountainous side, the rotary support is connected with the bottom of a piston spring support rod, the top of the piston spring support rod is connected with a pulley, a flexible protective net is arranged above the steel shed tunnel body, one side of the flexible protective net is fixed on the mountainous side far away from the top plate of the steel shed tunnel body, the other side of the flexible protective net is connected with a pull rope, the pull rope is anchored in a side slope by bypassing the pulley, and one. According to the invention, a box-type assembled structure is adopted, and the flexible protective net systems are arranged at the top of the steel shed tunnel and the side face of the side slope, so that the steel shed tunnel structure is protected in an all-round and dead-angle-free manner, and the rockfall protection performance of the steel shed tunnel is greatly improved.
Description
Technical Field
The invention relates to the field of road traffic safety protection facilities, in particular to a high-energy-level protection steel shed tunnel suitable for any landform in a mountainous area.
Background
In recent years, after geological disasters such as violent earthquakes and high-level collapse frequently occur in mountainous areas, rush-to-walk and secure communication particularly for mountainous area roads under complex terrain conditions have become "lifeline" projects. Practice proves that the construction of the steel shed tunnel has the advantages of factory prefabrication and rapid assembly; but the large-scale popularization and application of the artificial marble are limited by the defects of poor capability of adapting to terrain conditions, poor rock fall prevention capability of the structure and poor lateral pressure resistance. But the traditional reinforced concrete shed tunnel has long construction period and cannot play a role in rush-clearing and keeping the tunnel. How to improve the protection capability of the steel shed tunnel becomes a problem which needs to be solved urgently.
The traditional steel shed tunnel is generally a beam and a column, an upper protective layer is a truss and steel plate combined form to prevent falling rocks, the protective capability of the mode is limited, the mode is useful for scattered fine falling rocks, the high-position collapse effect is small, the protective effect cannot be achieved, and the falling rocks are punctured frequently.
Disclosure of Invention
In order to solve the technical problem, the invention discloses a high-energy-level protection steel shed tunnel suitable for any landform in a mountainous area.
The invention is realized by the following technical scheme:
the utility model provides a high energy level protection steel shed hole suitable for arbitrary topography in mountain area, includes the steel shed hole body roof leans on the mountain side to set up rotatory support, and rotatory support links to each other with a piston spring vaulting pole bottom, and piston spring vaulting pole top is connected with the pulley, steel shed hole body top is provided with flexible protection network, and flexible protection network one side is fixed in the far away mountain side of steel shed hole body roof, and the opposite side is connected with the stay cord, and the pulley anchor is walked around to the stay cord in the side slope, the stay cord is close to side slope one end and is equipped with the pressure reduction ring.
According to the invention, the steel shed tunnel is of a box-type assembled structure, the flexible protective net is used as a protection system, the roof of the steel shed tunnel is protected from falling rocks, when falling rocks fall into the flexible protective net, the impact energy of high-level collapse high-energy-level falling rocks can be buffered by utilizing the large deformation amount of the flexible protective net, the pressure reducing ring is started at the same time, the first energy consumption is carried out through the deformation of the pressure reducing ring and the flexible protective net, when the impact energy is overlarge, the piston spring supporting rod is triggered to compress under the action of the pull rope and the pulley, the impact energy of the falling rocks is buffered, the second energy consumption is realized, after the piston spring supporting rod is compressed, the flexible net is further deformed, the action time of the falling rocks is greatly prolonged, the impact force of the falling rocks is also converted into an average force by a pulse force, the buffering capacity of the flexible net is further enhanced, the falling rocks speed is gradually reduced to, When the restoring force of the pressure reducing ring and the flexible protective net is greater than the gravity of the falling rocks, the original length of the pressure reducing ring and the spring is restored, the flexible protective net is straightened, the falling rocks are stripped from the range of the steel shed tunnel, and the falling rocks protective performance of the steel shed tunnel is greatly improved through dual energy consumption.
Further, the steel shed tunnel body comprises stand columns, cross beams and longitudinal beams, the cross beams and the longitudinal beams are connected with each other to form a top plate framework and a bottom plate framework, and the stand columns are connected with the top plate framework and the bottom plate framework.
Furthermore, the piston spring support rod can rotate around the rotating support and is fixed, a plurality of bolt holes are reserved in the cross beam in the transverse direction and used for installing auxiliary rods, and the top ends of the auxiliary rods incline towards the side of the backer.
The rotary support adopts the existing structure, and the specific construction and the principle thereof are not described again.
Furthermore, the piston spring support rod comprises a rod body and a piston rod, the top of the rod body is a hollow cylinder, the piston rod is arranged in the hollow cylinder, the top of the piston rod is connected with the pulley, a first limit ring is sleeved on the piston rod below the pulley, a second limit ring is sleeved on the piston spring support rod, a spring is fixed between the first limit ring and the second limit ring, and the diameter of the first limit ring is larger than that of the piston spring support rod.
Furthermore, the top end of the auxiliary rod is detachably connected with the piston spring support rod.
In the process of building the steel shed tunnel, the angle of the piston spring support rod is adjusted and fixed according to the side face and the top mountain condition of the steel shed tunnel, then the top end and the bottom end of the auxiliary rod are connected to the piston spring support rod and the cross beam respectively, the auxiliary rod can increase the strength of the piston spring support rod, the stability and the impact resistance of the piston spring support rod are improved, a piston rod of the piston spring support rod is connected with a pulley, the bottom of the piston spring support rod is connected with a rod body, and the external spring has a buffering effect.
Further, stand bottom or crossbeam lean on the mountain side to be provided with the rotatory support of second, and a second piston spring vaulting pole is connected to the rotatory support of second, and second piston spring vaulting pole end connection second pulley, the stand leans on the mountain side to be equipped with the second protection network, and second protection network upside links to each other with the stand top surface, and the haulage rope is connected to the downside, and the haulage rope is walked around second pulley back anchor and is close to one side of bottom plate skeleton at the side slope, and the haulage rope is close to side slope one side and is equipped with the second decompression ring.
Furthermore, the second piston spring support rod is the same as the piston spring support rod in structure, a plurality of bolt holes are vertically reserved in the upright rod and used for installing reinforcing rods, and the reinforcing rods are detachably connected with the rod body part of the second piston spring support rod.
According to the invention, when the side slope is steep, the falling rocks usually only impact the steel shed tunnel top plate, so that only parts such as the piston spring support rod and the flexible protective net need to be arranged, when the side slope is gentle, the falling rocks impact the steel shed tunnel top plate and the side plate, so that the bottom of the side, close to the mountain, of the steel shed tunnel is provided with the second rotary support and the second piston spring support rod, and the second protective net for protecting the steel shed tunnel side plate is arranged, and the working principle of the parts such as the second piston spring support rod, the second protective net and the reinforcing rod is similar to that of the parts such as the piston spring support rod and the flexible protective net.
During installation, the angle of the second piston spring support rod is adjusted and fixed according to the shape of a side slope, then two ends of the reinforcing rod are connected with the second piston spring support rod and the stand column, the stability of the second piston spring support rod is enhanced, then the second protective net is installed, when falling rocks fall into the second protective net from a mountain body, the impact force of the falling rocks is reduced through the deformation of the second protective net and the second pressure reducing ring, first energy consumption is carried out, if the impact force is too large, the spring compression of the second piston spring support rod is triggered, second energy consumption is carried out, after the falling rocks speed is reduced to zero, the falling rocks are separated from the second protective net glass through the restoring forces of the spring, the second protective net and the second pressure reducing ring, and the omnibearing protection of the steel shed is realized.
Furthermore, the upright posts are I-shaped steel, and the cross beams and the longitudinal beams are box-shaped beams.
Further, flexible protection network includes support rope, shackle and steel loop net, the steel loop net sets up between several support ropes, links to each other through a plurality of shackles between steel loop net and the support rope.
Furthermore, a plurality of groups of rotating supports, piston spring support rods and pulley structures are arranged and are longitudinally distributed along the steel shed tunnel body, and the rotating supports are arranged on the side, close to the mountain, of the cross beam or on the top ends of the stand columns.
The pull rope and the traction rope are a plurality of ropes.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the high-energy-level protection steel shed tunnel is suitable for any landform in a mountainous area, the steel shed tunnel is of a box-type assembled structure, a flexible protective net is used as a protection system, a roof of the steel shed tunnel is protected from falling rocks, when falling rocks fall into the flexible protective net, the impact energy of the high-level collapsed high-energy-level falling rocks can be buffered by using the large deformation amount of the flexible protective net, and meanwhile, a pressure reducing ring is started to perform first energy consumption through the deformation of the pressure reducing ring and the flexible protective net;
2. the invention relates to a high-energy-level protection steel shed tunnel suitable for any landform in a mountainous area, when rockfall impact energy is too large, a piston spring support rod is triggered to compress under the action of a pull rope and a pulley, rockfall impact energy is buffered, secondary energy consumption is realized, a flexible net is further deformed after the piston spring support rod is compressed, the rockfall action time is greatly prolonged in the process, rockfall impact force is converted into average force from pulse force, the buffering capacity of the flexible net is further enhanced, rockfall speed is gradually reduced to zero, when the restoring force of the piston spring support rod spring, the decompression ring and a flexible protective net is larger than rockfall gravity, the decompression ring and the spring recover original lengths, the flexible protective net is straightened, rockfall is stripped from the range of the steel shed tunnel, and the rockfall protection performance of the steel shed tunnel is greatly improved through double energy consumption.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a piston rod of the present invention;
FIG. 3 is a schematic cross-sectional view of a piston rod according to the present invention;
fig. 4 is a schematic view of a flexible protection net according to the present invention;
FIG. 5 is a schematic view of the primary protection against falling rocks according to the present invention;
FIG. 6 is a schematic diagram of the secondary protection against rockfall according to the present invention;
FIG. 7 is a schematic illustration of a rockfall pop-up according to the present invention;
fig. 8 is a schematic view of the steep slope protection of the present invention.
Reference numbers and corresponding part names in the drawings:
1-steel shed hole body, 11-upright post, 12-cross beam, 13-longitudinal beam, 14-top plate skeleton, 15-bottom plate skeleton, 16-bolt hole, 17-auxiliary rod, 2-rotary support, 3-piston spring support rod, 31-rod body, 32-piston rod, 33-first limiting ring, 34-second limiting ring, 35-spring, 4-pulley, 5-flexible protective net, 51-supporting rope, 52-shackle, 53-steel ring net, 6-pull rope, 61-pressure reducing ring, 7-slope, 8-second rotary support, 81-second piston spring support rod, 82-second pulley, 9-second protective net, 91-pull rope, 92-second pressure reducing ring and 10-reinforcing rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in figure 1, the high-energy-level protection steel shed tunnel suitable for any landform in a mountainous area comprises a steel shed tunnel body 1, wherein a rotary support 2 is arranged on the top plate of the steel shed tunnel body 1 close to the mountainous side, the rotary support 2 is connected with the bottom of a piston spring support rod 3, a pulley 4 is connected to the top of the piston spring support rod 3, a flexible protective net 5 is arranged above the steel shed tunnel body 1, one side of the flexible protective net 5 is fixed to the mountainous side far away from the top plate of the steel shed tunnel body 1, the other side of the flexible protective net is connected with a pull rope 6, the pull rope 6 is anchored in a side slope 7 by bypassing the pulley 4, and a pressure reduction ring 61 is.
Example 2
As shown in fig. 1 to 3, the present embodiment is based on embodiment 1: the steel shed tunnel body 1 comprises upright columns 11, cross beams 12 and longitudinal beams 13, the cross beams 12 and the longitudinal beams 13 are connected with each other to form a top plate framework 14 and a bottom plate framework 15, and the upright columns 11 are connected with the top plate framework 14 and the bottom plate framework 15.
Further, the piston spring support rod 3 can rotate around the rotating support 2 and is fixed, a plurality of bolt holes 16 are reserved in the transverse direction of the cross beam 12, the bolt holes 16 are used for installing auxiliary rods 17, and the top ends of the auxiliary rods 17 incline towards the side of the mountain leaning.
Further, piston spring vaulting pole 3 includes the body of rod 31 and piston rod 32, and body of rod 31 top is hollow section of thick bamboo, sets up piston rod 32 in the hollow section of thick bamboo, and piston rod 32 top links to each other with pulley 4, and the cover is equipped with first spacing ring 33 on the piston rod 32 of pulley 4 below, the cover is equipped with second spacing ring 34 on the piston spring vaulting pole 3, and a fixed spring 35 between first spacing ring 33 and second spacing ring 34, first spacing ring 33 diameter is greater than 3 diameters of piston spring vaulting pole.
Furthermore, the top end of the auxiliary rod 17 is detachably connected with the piston spring support rod 3.
Example 3
As shown in fig. 1 to 3, the present embodiment is based on embodiment 2: the bottom of the upright 11 or the mountain side of the beam 12 is provided with a second rotary support 8, the second rotary support 8 is connected with a second piston spring support 81, the end of the second piston spring support 81 is connected with a second pulley 82, the mountain side of the upright 11 is provided with a second protective net 9, the upper side of the second protective net 9 is connected with the top surface of the upright 11, the lower side of the second protective net is connected with a traction rope 91, the traction rope 91 is anchored on one side of the side slope 7 close to the bottom plate framework 15 after bypassing the second pulley 82, and the traction rope 91 is provided with a second decompression ring 92 close to one side of the side slope 7.
Further, the second piston spring support rod 81 is constructed the same as the piston spring support rod 3, a plurality of bolt holes 16 are vertically reserved on the vertical rod, the bolt holes 16 are used for installing the reinforcing rod 10, and the reinforcing rod 10 is detachably connected with the rod body 31 part of the second piston spring support rod 81.
Example 4
As shown in fig. 1 to 4, the present embodiment is based on embodiment 3: the upright posts 11 are I-shaped steel, and the cross beams 12 and the longitudinal beams 13 are box-shaped beams.
Further, the flexible protection net 5 comprises support ropes 51, shackles 52 and a steel ring net 53, wherein the steel ring net 53 is arranged among the support ropes 51, and the steel ring net 53 is connected with the support ropes 51 through the shackles 52.
Furthermore, a plurality of groups of rotating supports 2, piston spring support rods 3 and pulleys 4 are arranged in the structure and are longitudinally arranged along the steel shed tunnel body 1, and the rotating supports 2 are arranged on the side, close to the mountain, of the cross beam 12 or on the top ends of the upright posts 11.
As shown in fig. 5, at the beginning of the contact between the rockfall and the flexible protective net 5 and the second protective net 9, the flexible protective net 5, the second protective net 9, the pressure reducing rings 61, and the second pressure reducing rings 92 deform, and the impact energy of the high-level collapse rockfall is subjected to the first energy consumption.
As shown in fig. 6, after the rockfall contacts the flexible protective net 5 and the second protective net 9, the excessive impact force triggers the spring 35 to compress, and the impact energy of the high-level collapsed high-energy rockfall is subjected to second energy consumption, meanwhile, the flexible protective net 5 and the second protective net 9 are further deformed, the rockfall action time is greatly prolonged in the process, rockfall impact force is also converted into an average force by an impulse force, the buffering capacity of the flexible protective net 5 and the second protective net 9 is further enhanced, and rockfall speed is gradually reduced to zero.
As shown in fig. 7, the pressure reducing rings 61, the second pressure reducing rings 92 and the springs 35 recover the original length, the flexible protective nets 5 and the second protective nets 9 are straightened, the falling rocks are stripped from the steel shed tunnel range, and the falling rocks protective performance of the steel shed tunnel is greatly improved through double energy consumption
As shown in fig. 8, when the slope 7 is steep, the falling rocks usually only impact the steel shed roof, so that only the piston spring support rods 3, the flexible protective nets 5 and other components need to be arranged, and no components such as the second piston spring support rods 81 and the second protective nets 9 need to be arranged.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a high energy level protection steel shed hole suitable for arbitrary topography in mountain area, includes steel shed hole body (1), its characterized in that steel shed hole body (1) roof leans on the mountain side to set up swivel mount (18), and swivel mount (18) link to each other with a piston spring vaulting pole (3) bottom, and piston spring vaulting pole (3) top is connected with pulley (4), steel shed hole body (1) top is provided with flexible protection network (5), and flexible protection network (5) one side is fixed in the far away mountain side of steel shed hole body (1) roof, and the opposite side is connected with stay cord (6), and pulley (4) anchor is walked around in side slope (7) in stay cord (6), stay cord (6) are close to side slope (7) one end and are equipped with pressure reduction ring (61).
2. A high-energy-level protection steel shed tunnel suitable for any terrain in mountainous areas as claimed in claim 1, wherein the steel shed tunnel body (1) comprises upright columns (11), cross beams (12) and longitudinal beams (13), the cross beams (12) and the longitudinal beams (13) are connected with each other to form a top plate framework (14) and a bottom plate framework (15), and the upright columns (11) are connected with the top plate framework (14) and the bottom plate framework (15).
3. A high-energy-level protection steel shed tunnel suitable for any terrain in mountainous areas as claimed in claim 2, wherein the piston spring supporting rods (3) can rotate and be fixed around a rotating support (18), a plurality of bolt holes (16) are reserved on the cross beam (12) in the transverse direction, the bolt holes (16) are used for installing auxiliary rods (17), and the top ends of the auxiliary rods (17) incline to the side of the mountain.
4. The high-energy-level protection steel shed tunnel suitable for any landform in mountainous areas is characterized in that the piston spring support rod (3) comprises a rod body (31) and a piston rod (32), the top of the rod body (31) is a hollow cylinder, the piston rod (32) is arranged in the hollow cylinder, the top of the piston rod (32) is connected with the pulley (4), a first limit ring (33) is sleeved on the piston rod (32) below the pulley (4), a second limit ring (34) is sleeved on the piston spring support rod (3), a spring (35) is fixed between the first limit ring (33) and the second limit ring (34), and the diameter of the first limit ring (33) is larger than that of the piston spring support rod (3).
5. A high-energy-level protection steel shed tunnel suitable for any terrain in mountainous areas as claimed in claim 4, characterized in that the top end of the auxiliary rod (17) is detachably connected with the piston spring support rod (3).
6. The high-energy-level protection steel shed tunnel suitable for any landform in a mountainous area is characterized in that a second rotary support (8) is arranged at the bottom of the upright column (11) or on the side, close to the mountain, of the cross beam (12), the second rotary support (8) is connected with a second piston spring support rod (81), the end of the second piston spring support rod (81) is connected with a second pulley (82), a second protective net (9) is arranged on the side, close to the mountain, of the upright column (11), the upper side of the second protective net (9) is connected with the top surface of the upright column (11), the lower side of the second protective net is connected with a traction rope (91), the traction rope (91) is anchored on the side, close to the bottom plate framework (15), of the side slope (7) after winding around the second pulley (82), and a second pressure reducing ring (92) is arranged on the side, close.
7. A high-energy-level protection steel shed tunnel suitable for any terrain in mountainous areas as claimed in claim 6, wherein the second piston spring support rod (81) is identical in structure to the piston spring support rod (3), a plurality of bolt holes (16) are vertically reserved on the vertical rod, the bolt holes (16) are used for installing the reinforcing rod (10), and the reinforcing rod (10) is detachably connected with the rod body (31) of the second piston spring support rod (81).
8. A high-energy-level protection steel shed tunnel suitable for any terrain in mountainous areas as claimed in claim 2, wherein the upright posts (11) are i-steel, and the cross beams (12) and the longitudinal beams (13) are box-shaped beams.
9. The high-energy-level protection steel shed tunnel suitable for any landform in a mountainous area as claimed in claim 1, wherein the flexible protection net (5) comprises support ropes (51), shackles (52) and steel ring nets (53), the steel ring nets (53) are arranged among the support ropes (51), and the steel ring nets (53) are connected with the support ropes (51) through the shackles (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010032210.4A CN111139756A (en) | 2020-01-13 | 2020-01-13 | High-energy-level protection steel shed tunnel suitable for mountainous area arbitrary terrain |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010032210.4A CN111139756A (en) | 2020-01-13 | 2020-01-13 | High-energy-level protection steel shed tunnel suitable for mountainous area arbitrary terrain |
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| CN111139756A true CN111139756A (en) | 2020-05-12 |
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| CN202010032210.4A Pending CN111139756A (en) | 2020-01-13 | 2020-01-13 | High-energy-level protection steel shed tunnel suitable for mountainous area arbitrary terrain |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359736A (en) * | 2020-11-30 | 2021-02-12 | 陈国俊 | Buffering device for protecting side slope rolling stone |
| CN112813862A (en) * | 2021-01-11 | 2021-05-18 | 西南交通大学 | Scenic spot plank road full-particle-size rockfall protection combined flexible glass net and installation method thereof |
| CN113187087A (en) * | 2021-04-19 | 2021-07-30 | 西南交通大学 | High-falling object flexible glass protective net with landscape function and design method thereof |
| CN113216024A (en) * | 2021-05-08 | 2021-08-06 | 四川省交通勘察设计研究院有限公司 | Assembled steel case canopy hole of hierarchical protection |
-
2020
- 2020-01-13 CN CN202010032210.4A patent/CN111139756A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359736A (en) * | 2020-11-30 | 2021-02-12 | 陈国俊 | Buffering device for protecting side slope rolling stone |
| CN112359736B (en) * | 2020-11-30 | 2022-04-05 | 陈国俊 | Buffering device for protecting side slope rolling stone |
| CN112813862A (en) * | 2021-01-11 | 2021-05-18 | 西南交通大学 | Scenic spot plank road full-particle-size rockfall protection combined flexible glass net and installation method thereof |
| CN112813862B (en) * | 2021-01-11 | 2021-11-05 | 西南交通大学 | Scenic spot plank road full-particle-size rockfall protection combined flexible glass net and installation method thereof |
| CN113187087A (en) * | 2021-04-19 | 2021-07-30 | 西南交通大学 | High-falling object flexible glass protective net with landscape function and design method thereof |
| CN113216024A (en) * | 2021-05-08 | 2021-08-06 | 四川省交通勘察设计研究院有限公司 | Assembled steel case canopy hole of hierarchical protection |
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