CN211547433U - Do benefit to used repeatedly's steel hangar tunnel protection system and steel hangar tunnel - Google Patents
Do benefit to used repeatedly's steel hangar tunnel protection system and steel hangar tunnel Download PDFInfo
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- CN211547433U CN211547433U CN202020036899.3U CN202020036899U CN211547433U CN 211547433 U CN211547433 U CN 211547433U CN 202020036899 U CN202020036899 U CN 202020036899U CN 211547433 U CN211547433 U CN 211547433U
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Abstract
The utility model discloses a steel shed tunnel protection system beneficial to repeated use, which comprises at least one group of rockfall stripping assemblies, wherein the rockfall stripping assemblies are arranged at the top and/or the side part of the steel shed tunnel; the rockfall stripping assembly comprises a piston spring rod, a support rod and an elastic protective net; one end of the supporting rod is rotatably connected with the steel shed tunnel frame structure, the other end of the supporting rod is rotatably connected with one end of the piston spring rod, and the other end of the piston spring rod is fixedly connected with the steel shed tunnel frame structure; an elastic protective net is fixed between the two supporting rods; the net surface of the elastic protective net faces the falling direction of the falling rocks and is used for being in direct contact with the falling rocks. The utility model provides an elasticity protection network plays buffering and rockfall effect of peeling off with the piston spring pole, does benefit to repetition, the repetitious usage that realizes the protection system.
Description
Technical Field
The utility model relates to a road traffic safety protection facility field, concretely relates to do benefit to used repeatedly's steel hangar hole protection system.
Background
In recent years, after geological disasters such as violent earthquakes and high-level collapse occur in mountainous areas for many times, the rush-to-walk and the traffic-securing of mountainous area highways particularly under complex terrain conditions become life line 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. Therefore, a buffer mechanism, such as a sand buffer layer, a foam buffer layer and the like, is flatly laid on the top of the steel shed tunnel. Falling rocks fall behind steel shed hole top surface, need artifical instant clearance, still there is the risk of being hit by the falling rocks among the artifical clearance process, consequently, the cost of labor and the construction risk have been increased, so steel shed hole top falling rocks often can't instant clearance, the great falling rocks of volume and the less falling rocks of volume can be piled up at steel shed hole top, accumulate accumulational falling rocks and reach behind the certain degree, the elastic buffer effort of the gross gravity of falling rocks can balanced buffer gear, follow-up falling rocks that fall at steel shed hole top, can be because buffer gear loses cushioning effect, direct impact effort and falling rocks gravity transfer to steel shed hole frame construction, influence steel shed hole overall structure stability. In addition, the above-mentioned problems are also caused when the buffer mechanism is laid on the side wall of the steel shed tunnel and the falling rocks are accumulated on the side wall of the steel shed tunnel.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: traditional steel hangar tunnel, the utility model provides a do benefit to used repeatedly's steel hangar tunnel protection system who solves above-mentioned problem.
The utility model discloses a following technical scheme realizes:
a steel shed tunnel protection system beneficial to reuse comprises at least one group of rockfall stripping assemblies, wherein the rockfall stripping assemblies are arranged at the top and/or the side of a steel shed tunnel; the rockfall stripping assembly comprises a piston spring rod, a support rod and an elastic protective net; one end of the supporting rod is rotatably connected with the steel shed tunnel frame structure, the other end of the supporting rod is rotatably connected with one end of the piston spring rod, and the other end of the piston spring rod is fixedly connected with the steel shed tunnel frame structure; an elastic protective net is fixed between the two supporting rods; the net surface of the elastic protective net faces the falling direction of the falling rocks and is used for being in direct contact with the falling rocks.
And a buffer mechanism, such as a sand buffer layer, a foam buffer layer and the like, is horizontally paved on the top of the steel shed tunnel. Falling rocks fall behind steel shed hole top surface, need artifical instant clearance, still there is the risk of being hit by the falling rocks among the artifical clearance process, consequently, the cost of labor and the construction risk have been increased, so steel shed hole top falling rocks often can't instant clearance, the great falling rocks of volume and the less falling rocks of volume can be piled up at steel shed hole top, accumulate accumulational falling rocks and reach behind the certain degree, the elastic buffer effort of the gross gravity of falling rocks can balanced buffer gear, follow-up falling rocks that fall at steel shed hole top, can be because buffer gear loses cushioning effect, direct impact effort and falling rocks gravity transfer to steel shed hole frame construction, influence steel shed hole overall structure stability. In addition, when the buffer mechanism is laid on the side wall of the steel shed tunnel, falling rocks are accumulated on the side wall of the steel shed tunnel, and the problem that the lateral pressure resistance of the steel shed tunnel is reduced is also caused.
Therefore, the utility model provides a do benefit to steel shed hole protection system who peels off rockfall, this protection system's primary structure is one kind and peels off the subassembly by the rockfall that major structure bracing piece, piston spring pole and elasticity protection network constitute, this rockfall peels off the prefabricated part of subassembly as an independent use for install at steel shed hole top or lateral part (especially the lateral part that is close to the side slope), and according to demands such as protection area and protection level, can install a plurality of rockfall simultaneously and peel off the subassembly on the top or the lateral part of same steel shed hole. The utility model provides a falling rocks strips off subassembly, two bracing pieces are used for the elasticity protection network in the middle of fixing, form the falling rocks and accept the face, and the piston spring pole is used for supporting the falling rocks and accepts the one end of face, makes the falling rocks accept the face, the face of piston spring pole place and the steel shed hole place face that the subassembly was peeled off to the installation falling rocks head and the tail in proper order connect, forms and looks sideways at the supporting structure who is triangle-shaped, and the steel shed hole position that the subassembly was peeled off to the installation falling rocks is base, bracing piece and piston spring pole for both sides limit. Because the net surface of the elastic protective net faces the falling direction of the rockfall and is used for being directly contacted with the rockfall, when the rockfall at the side slope contacts the elastic protective net, the elastic protective net deforms, and the rockfall is buffered; when the impact force is too large and exceeds the deformation rigidity of the piston spring rod, the piston spring rod is driven by the elastic protective net to be compressed, so that deformation is generated, the whole energy consumption process is equivalent to converting a pulse impact force of falling rocks into an average impact force, the action time of the falling rocks is prolonged through the deformation of the elastic protective net and the piston spring rod, and the impact action of the falling rocks is reduced; and finally, after the falling rocks are intercepted, the impact force of the falling rocks is gradually reduced to the gravity of the falling rocks, and when the gravity of the falling rocks is smaller than the elastic force of the piston spring rod, the piston spring rod restores the original design length and the elastic protective net is deformed and restored, so that the falling rocks are stripped from the range of the steel shed tunnel.
Furthermore, when the rockfall stripping assembly is arranged at the top of the steel shed tunnel, an included angle alpha between the support rod and the piston spring rod is more than 0 and less than or equal to 90 degrees; when the rockfall stripping assembly is arranged on the side part of the steel shed tunnel, the included angle alpha between the support rod and the piston spring rod meets the condition that alpha is more than 0 and less than or equal to 90 degrees.
Under the condition that the rockfall stripping assembly is arranged at the top of the steel shed tunnel, the larger the included angle alpha between the support rod and the piston spring rod is, the larger the gradient of a rockfall bearing surface formed by the support rod and the elastic protective net is, the better the stripping effect is, but the more easily the piston spring rod is directly exposed under the rockfall, the direct impact of the rockfall is easily caused, and the stability of the whole rockfall glass assembly is ensured; the smaller the included angle alpha between the supporting rod and the piston spring rod is, the larger the falling rock bearing surface formed by the supporting rod and the elastic protective net is and the larger the falling rock contact surface is, so that a good buffering effect can be provided, the piston spring rod can be isolated from the falling rocks, the piston spring rod is protected, and the glass effect on the falling rocks is relatively reduced.
Further, the size of the gap of the elastic protective net when the steel shed tunnel is placed at the top is smaller than that of the gap of the elastic protective net when the steel shed tunnel is placed at the top.
Selecting an elastic protective net with relatively small pore size for a protection system at the top of the steel shed tunnel, so that 95% of falling rocks can be intercepted and the range of the steel shed tunnel can be stripped; the elastic protective net arranged on the side surface of the steel shed tunnel has a relatively large gap size, and allows a part of falling rocks to pass through; like this when the rockfall is less, can see through the elasticity protection network of lateral part, follow-up accessible is opened steel shed tunnel side door and is cleared up to after all particle size rockfalls peel off, at a large amount of rockfall at the inboard siltation of side slope.
Furthermore, a plurality of piston spring rods are correspondingly arranged at the top edge of the elastic protection net, one end of each piston spring rod is fixedly connected with the steel shed tunnel frame structure where the piston spring rod is located, and the other end of each piston spring rod is connected with the top edge of the elastic protection net.
If only set up the piston spring pole in the bracing piece corresponds the side, then the elasticity protection network geometric centre department between two bracing pieces is far away relatively from the piston spring pole distance, mainly drives the bracing piece through the elasticity protection network, the bracing piece drives the piston spring pole again and warp, and it is great to the space requirement that the elasticity protection network allows to warp, and the impact force of falling rocks reaches the great value and just can start the piston spring pole and warp the cushioning effect. Consequently, at the piston spring pole the utility model discloses a between two bracing pieces, elasticity protection network topside department also is connected with the piston spring pole, and when the impact effort was received to the elasticity protection network, direct pulling piston spring pole compression deformation played buffering and implementation peeling effect.
Furthermore, supporting ropes are respectively pulled between the top ends of the two supporting rods and between the bottom ends of the two supporting rods, and the top edge and the bottom edge of the elastic protective net are connected with the supporting ropes through the pulling ropes.
Through setting up the stay cord, play to draw, the supporting role to the position far away from both sides bracing piece on the elasticity protective screen.
Furthermore, a rubber support, a rigid combination board and a rubber layer are sequentially arranged on the top surface of the steel shed tunnel from bottom to top; a plurality of rubber supports are distributed between the rigid combination plate and the upper surface of the top of the steel shed tunnel.
The utility model provides a three-layer buffering defense system, the first layer is elasticity protection network and piston spring pole, and the second floor is the rubber layer, and the third layer is rubber support. The rubber support, the rigid combination board and the rubber layer are sequentially arranged at the top of the steel shed tunnel and are used as an auxiliary energy consumption mechanism of the rockfall stripping mechanism, and when the elastic protective net reaches an allowable deformation space under the impact action of rockfall, the rockfall contacts the upper rubber layer and plays a role in buffering through the rubber layer; when the falling rock impact energy is too large, the last defense mechanism is started after the rubber layer reaches the allowable deformation space, namely, the acting force is transmitted to the rubber support downwards through the rubber layer and the rigid combination plate, and the rubber support deforms to play a role in buffering.
Further, the thickness of the rubber support is 50 cm-60 cm, the thickness of the rigid combination plate is 35 cm-50 cm, and the thickness of the rubber layer is 10 cm-20 cm.
In the rubber layer and the rubber support, the rubber support plays a main buffering role; the rubber layer is used for protecting the rigid combination plate, and the impact force of falling rocks is decomposed and averaged.
Further, a rubber layer is arranged on the outer surface of the side part of the steel shed tunnel, which is provided with the rockfall stripping assembly.
The rubber layer is arranged on the outer side wall of the steel shed tunnel, so that the side wall of the steel shed tunnel is protected; meanwhile, the falling rock stripping assembly on the side part of the steel shed tunnel plays an auxiliary buffering role.
A steel shed tunnel comprises the steel shed tunnel protection system beneficial to reuse.
Furthermore, the steel shed tunnel is of a box-type structure and is spliced and installed by prefabricated cross beams and longitudinal beams; the bottom of the steel shed tunnel is anchored on the ground through anchor rods.
The steel shed tunnel is assembled by taking the existing I-steel as a stand column and taking the box-shaped beam as a cross beam and a longitudinal beam, and rotary hinged supports are reserved on the bottom longitudinal beam and the top longitudinal beam, so that one end of a support rod is conveniently and rotatably connected with the steel shed tunnel; the anchor rod is anchored at the bottom of the steel shed tunnel and is driven into the foundation to prevent falling rocks from laterally impacting to cause the overturn of the shed tunnel, so that the lateral pressure resistance of the steel shed tunnel is improved.
The utility model discloses have following advantage and beneficial effect:
1. the utility model provides an elasticity protection network plays buffering and rockfall effect of peeling off with the piston spring pole, does benefit to repetition, the repetitious usage that realizes the protection system: when falling rocks at the side slope contact the elastic protective net, the elastic protective net deforms to buffer the falling rocks; when the impact force is too large and exceeds the deformation rigidity of the piston spring rod, the piston spring rod is driven by the elastic protective net to be compressed, so that deformation is generated, the whole energy consumption process is equivalent to converting a pulse impact force of falling rocks into an average impact force, the action time of the falling rocks is prolonged through the deformation of the elastic protective net and the piston spring rod, and the impact action of the falling rocks is reduced; after the falling rocks are finally intercepted, the impact force of the falling rocks is gradually reduced to the gravity of the falling rocks, and when the gravity of the falling rocks is smaller than the elastic force of the piston spring rod, the piston spring rod restores the original design length and the elastic protective net is deformed and restored, so that the falling rocks are stripped from the range of the steel shed tunnel;
2. the utility model provides a three-layer buffering defense system, the first layer is elasticity protection network and piston spring pole, and the second floor is the rubber layer, and the third layer is rubber support. The rubber support, the rigid combination board and the rubber layer are sequentially arranged at the top of the steel shed tunnel and are used as an auxiliary energy consumption mechanism of the rockfall stripping mechanism, and when the elastic protective net reaches an allowable deformation space under the impact action of rockfall, the rockfall contacts the upper rubber layer and plays a role in buffering through the rubber layer; when the falling rock impact energy is too large, the last defense mechanism is started after the rubber layer reaches the allowable deformation space, namely, the acting force is transmitted to the rubber support downwards through the rubber layer and the rigid combination plate, and the rubber support deforms to play a role in buffering.
To sum up, the utility model relates to a do benefit to used repeatedly's steel shed hole protection system can adapt to the arbitrary topography in mountain area and assemble the construction fast on arbitrary road, can improve steel shed hole protection energy level greatly through elasticity protection network and piston spring to can peel off the shed hole scope with the falling rocks, not influence follow-up protection. The utility model provides a steel shed tunnel kind can reach to speedily carry out the expert, protect the logical function and have higher protection energy level, and can realize the self-resuming, repetitious usage, the core key technology for emergency rescue and relief work emergency response.
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 view of the protection process of the protection system when the side slope is steep according to the present invention;
FIG. 2 is a schematic view of the protection process of the protection system when the side slope is relatively gentle;
fig. 3 is a top view of the elastic protection net of the present invention;
fig. 4 is a schematic view of the piston spring rod structure.
Reference numbers and corresponding part names in the drawings: 1-piston spring rod, 11-baffle, 12-lower round steel tube, 13-helical spring, 14-upper round steel tube, 2-support rod, 3-elastic protective net, 4-support rope, 5-rubber support, 6-rigid composition board, 7-rubber layer, 8-anchor rod, 9-rotary support, A-steel shed tunnel and B-slope.
Detailed Description
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 the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
This embodiment provides a do benefit to used repeatedly's steel hangar tunnel protection system, including the subassembly is peeled off to the multiunit rockfall, vertically arranges in proper order along the steel hangar tunnel. At the steep side slope, arranging a rock fall stripping assembly at the top of the steel shed tunnel, as shown in figure 1; at the lower part of the side slope, the top of the steel shed tunnel and the side wall close to the side slope are provided with the falling stripping components, as shown in figure 2.
The rockfall stripping assembly comprises two piston spring rods 1, two support rods 2 and an elastic protective net 3; one end of the support rod 2 is rotatably connected with the steel shed tunnel frame structure, the other end of the support rod 2 is rotatably connected with one end of the piston spring rod 1, and the rotary connecting mechanism adopts the existing mechanisms such as hinging, pin shaft rotary connecting and the like; the other end of the piston spring rod 1 is fixedly connected with the steel shed tunnel frame structure; an elastic protective net 3 is fixed between the two support rods 2; the net surface of the elastic protective net 3 faces the falling direction of the falling rocks and is used for directly contacting the falling rocks.
Example 2
Based on the embodiment 1, the elastic protection net 3 is further optimized to be a net structure with elastic expansion and contraction effects, and the allowable deformation space is 1 m-1.5 m. When the rockfall stripping assembly is arranged at the top of the steel shed tunnel, an included angle alpha between the support rod 2 and the piston spring rod 1 is not more than 90 degrees, and the specific value of the included angle alpha can be set according to the slope gradient and the inclination angle of the net surface of the elastic protective net, such as alpha is 45 degrees. When the rockfall stripping assembly is arranged on the side portion of the steel shed tunnel, an included angle alpha between the support rod 2 and the piston spring rod 1 is not more than 150 degrees, and the specific value of the included angle alpha can be set according to the slope gradient and the inclination angle of the net surface of the elastic protective net, for example, alpha is 60 degrees. The gap size of the elastic protective net 3 is 5cm multiplied by 5cm when the elastic protective net is arranged at the top of the steel shed tunnel, so that 95 percent of falling rocks can be intercepted and the range of the shed tunnel can be stripped. The size of the gap of the elastic protective net 3 is 20cm multiplied by 20cm when the elastic protective net is placed on the side wall of the steel shed tunnel, so that falling rocks with small volume are allowed to penetrate through the protective net, and the side door of the steel shed tunnel is subsequently opened for cleaning.
Example 3
Further optimization is performed on the basis of the embodiment 2, a plurality of piston spring rods 1 are correspondingly arranged at the top edge of the elastic protection net 3, one end of each piston spring rod 1 is fixedly connected with the steel shed tunnel frame structure where the piston spring rod is located, and the other end of each piston spring rod 1 is connected with the top edge of the elastic protection net 3. Supporting ropes 4 are respectively pulled between the top ends of the two supporting rods 2 and between the bottom ends of the two supporting rods 2, and the top edges and the bottom edges of the elastic protective nets 3 are connected with the supporting ropes 4 through pulling ropes.
Example 4
On the basis of the embodiment 3, the rubber support 5, the rigid combination plate 6 and the rubber layer 7 are sequentially arranged on the top surface of the steel shed tunnel from bottom to top, a plurality of rubber supports 5 are distributed between the rigid combination plate 6 and the top surface of the top of the steel shed tunnel, and the rubber supports are specifically arranged at intervals of 50-80 cm. The thickness of the rubber support 5 is 50 cm-60 cm, the thickness of the rigid combination board 6 is 35 cm-50 cm, the width of the rigid combination board 6 in the longitudinal direction is 1m, and the thickness of the rubber layer 7 is 10 cm-20 cm. The rigid combination board 6 is a combination board of a stainless steel plate and concrete. And a rubber layer 7 is also arranged on the outer surface of the side part provided with the rockfall stripping assembly on the steel shed tunnel.
Example 5
This embodiment provides a steel hangar comprising the steel hangar protection system provided in embodiment 4. The steel shed tunnel is of a box-shaped structure and is spliced and installed by prefabricated cross beams and longitudinal beams; the bottom of the steel shed tunnel is anchored on the ground through anchor rods 8.
The steel shed tunnel adopts steel frame shed tunnel, assembles for crossbeam, longeron through the I-steel for stand, box girder, reserves rotatory hinged-support 9 at bottom longeron and top longeron for bracing piece 2 rotates with the steel shed tunnel to be connected, and bottom anchor stock 8 is squeezed into the ground in order to prevent that the rockfall lateral impact from leading to the steel shed tunnel to topple.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A steel shed tunnel protection system beneficial to reuse is characterized by comprising at least one group of rockfall stripping assemblies, wherein the rockfall stripping assemblies are arranged at the top and/or the side of a steel shed tunnel;
the rockfall stripping assembly comprises a piston spring rod (1), a support rod (2) and an elastic protective net (3); one end of the supporting rod (2) is rotatably connected with the steel shed tunnel frame structure, the other end of the supporting rod (2) is rotatably connected with one end of the piston spring rod (1), and the other end of the piston spring rod (1) is fixedly connected with the steel shed tunnel frame structure; an elastic protective net (3) is fixed between the two support rods (2); the net surface of the elastic protective net (3) faces the falling direction of the falling rocks and is used for directly contacting the falling rocks.
2. The steel shed tunnel protection system beneficial to reuse as claimed in claim 1, wherein when the rockfall stripping assembly is arranged on the top of the steel shed tunnel, an included angle α between the support rod (2) and the piston spring rod (1) meets the condition that α is more than 0 and less than or equal to 90 degrees; when the rockfall stripping assembly is arranged on the side part of the steel shed tunnel, the included angle alpha between the support rod (2) and the piston spring rod (1) meets the condition that alpha is more than 0 and less than or equal to 150 degrees.
3. A steel hangar tunnel protection system facilitating reuse according to claim 1, characterized in that the size of the gaps of the elastic protection net (3) when placed on top of the steel hangar tunnel is smaller than the size of the gaps of the elastic protection net (3) when placed on top of the steel hangar tunnel.
4. The steel shed tunnel protection system beneficial to reuse according to any one of claims 1 to 3, wherein a plurality of piston spring rods (1) are correspondingly arranged at the top edge of the elastic protection net (3), one end of each piston spring rod (1) is fixedly connected with the steel shed tunnel frame structure where the piston spring rod is arranged, and the other end of each piston spring rod is connected with the top edge of the elastic protection net (3).
5. A steel hangar tunnel protection system convenient for repeated use as claimed in claim 1, characterized in that supporting ropes (4) are respectively drawn between the top ends of the two supporting rods (2) and between the bottom ends of the two supporting rods (2), and the top and bottom edges of the elastic protective net (3) are connected with the supporting ropes (4) through the drawing ropes.
6. The steel shed tunnel protection system beneficial to reuse as claimed in claim 1, wherein a rubber support (5), a rigid combination board (6) and a rubber layer (7) are sequentially arranged on the top surface of the steel shed tunnel from bottom to top; a plurality of rubber supports (5) are distributed between the rigid combination plate (6) and the upper surface of the top of the steel shed tunnel.
7. A steel shed tunnel protection system facilitating reuse according to claim 6, wherein the thickness of the rubber support (5) is 50cm to 60cm, the thickness of the rigid combination board (6) is 35cm to 50cm, and the thickness of the rubber layer (7) is 10cm to 20 cm.
8. A steel hangar protection system for reuse according to claim 1 or 6, wherein the steel hangar is provided with a rubber layer (7) on the outer surface of the side portion provided with the rockfall stripping assembly.
9. A steel hangar comprising a steel hangar protection system as claimed in any one of claims 1 to 8 for repeated use.
10. The steel shed tunnel according to claim 9, wherein the steel shed tunnel is a box-type structure and is assembled by prefabricated beams and longitudinal beams; the bottom of the steel shed tunnel is anchored on the ground through anchor rods (8).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030543A (en) * | 2022-07-24 | 2022-09-09 | 西南交通大学 | Curtain type pocket construction high-fall flexible protection system and design method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030543A (en) * | 2022-07-24 | 2022-09-09 | 西南交通大学 | Curtain type pocket construction high-fall flexible protection system and design method thereof |
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