CN111719469A - Anti-collision isolation guardrail device in highway center - Google Patents
Anti-collision isolation guardrail device in highway center Download PDFInfo
- Publication number
- CN111719469A CN111719469A CN202010722325.6A CN202010722325A CN111719469A CN 111719469 A CN111719469 A CN 111719469A CN 202010722325 A CN202010722325 A CN 202010722325A CN 111719469 A CN111719469 A CN 111719469A
- Authority
- CN
- China
- Prior art keywords
- thin
- steel plate
- wall
- energy
- mild steel
- 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
Images
Classifications
-
- 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
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0476—Foundations
-
- 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
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0407—Metal rails
- E01F15/0423—Details of rails
-
- 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
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0407—Metal rails
- E01F15/0423—Details of rails
- E01F15/043—Details of rails with multiple superimposed members; Rails provided with skirts
-
- 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
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
- E01F15/04—Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips supported above ground at spaced points
- E01F15/0461—Supports, e.g. posts
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The utility model provides a highway central authorities anticollision isolation barrier device, belongs to highway traffic facilities field, including the high-efficient power consumption thin wall mild steel plate that has the energy-absorbing recess, crashproof protection pad, light thin wall arch mild steel plate, cable, SMA coordinate spacing silk that resets etc, consolidate the basis and set up in the subsurface, the upper portion of consolidating the basis is equipped with the reinforcement base, and the upper portion of consolidating the base is equipped with guardrail bar, guardrail bar's upper portion is equipped with the shrouding, guardrail bar's the left and right sides is equipped with a plurality of high-efficient power consumption thin wall mild steel plates that have the energy-absorbing recess respectively, and light thin wall arch mild steel plate's the outside is equipped with crashproof protection pad and sets up the tension bar, and its one end links to each other with guardrail bar. The guardrail is suitable for being used as a central anti-collision isolation guardrail of a bidirectional highway, has low cost, simple manufacture and convenient disassembly, can be well replaced if damaged, and is favorable for promoting the industrialization process.
Description
Technical Field
The invention belongs to the field of road traffic facilities, and particularly relates to a central anti-collision isolation guardrail device for a road.
Background
With the development of national economy, a large number of highways, expressways, etc. are being built or under construction. At present, the protection devices on the two sides of the highway and the highway are composed of upright posts and protection plates positioned on the upper portions of the upright posts, the protection plates are made of steel plates, and the upright posts and the protection plates are made of rigid materials and are also in rigid connection. When the automobile is out of control and collides with the protection plate, the protection device can prevent the automobile from turning into the waterproof ditches at the two sides of the highway or rushing into the opposite lane to collide with the automobile. However, practice proves that the protective plate with the structure has no buffering function, and the protective plate is often broken under the strong impact force of an out-of-control automobile at high speed, so that the out-of-control automobile rushes into an opposite lane to crash, and the automobile is damaged and people die; especially, the broken protective plate is more serious to hurt people, and the danger that the automobile turns into the waterproof ditches at the two sides of the highway or rushes into the opposite lane to collide can not be effectively prevented. On the other hand, the protective plate made of the steel plate is also permeable, loses the anti-pressure and anti-collision effects, has short service life, and shows an increasing trend along with the mass construction of highways, urban overpasses and the like and the great increase of the global automobile holding capacity. At present, both the upright post and the guardrail plate are made of rigid materials. The existing guard rails in the current market do not have the functions of buffering and damping when in use, when an automobile collides with a guard rail plate, the automobile can only damage energy absorption by means of deformation of the guard rail plate, and the deformation capacity and the energy absorption capacity are limited. And the guard rail plate is easy to break under the impact of the automobile, so that the guard rail cannot be normally used, and the safety of the automobile and crewmembers is easy to cause secondary damage.
Disclosure of Invention
In order to solve the technical problems, the invention provides the highway central anti-collision isolation guardrail device which has strong anti-collision and damping coordination energy consumption capability, is very suitable for being used as a bidirectional highway central anti-collision isolation guardrail, has low cost, simple manufacture and convenient disassembly, can be well replaced if damaged, and is favorable for promoting the industrialized process.
In order to achieve the purpose, the invention adopts the technical scheme that:
the central anti-collision isolation guardrail device for the highway mainly comprises a high-efficiency energy-consumption thin-wall mild steel plate with an energy-absorbing groove, an obliquely-connected thin-wall mild steel plate, a vertically-connected thin-wall mild steel plate, an energy-absorbing groove, an anti-collision protection pad, a light thin-wall arched mild steel plate, a pull rope, a fixing bolt, an SMA (shape memory alloy) coordination limit reset wire, a high-damping spring, a light energy-consumption material, a pull rod, a damping device, a high-strength fixing hinge, a hinge coordination connecting rod, a common fixing hinge, a reinforcing foundation, a reinforcing base, a guardrail bar, an upper sealing plate, a ground and a welding connection hinge, wherein in the structure of the central anti-collision isolation guardrail device for the highway, the reinforcing foundation is arranged below the ground, the reinforcing base is arranged at the upper part of the reinforcing base, the guardrail bar is provided with the upper sealing plate at the upper, the energy-absorbing grooves of the high-efficiency energy-consuming thin-wall mild steel plates with the energy-absorbing grooves face outwards, the high-efficiency energy-consuming thin-wall mild steel plates with the energy-absorbing grooves are formed by connecting an inclined connecting thin-wall mild steel plate and a vertical connecting thin-wall mild steel plate, the energy-absorbing grooves are surrounded by the inclined connecting thin-wall mild steel plate and the vertical connecting thin-wall mild steel plate, the other ends of the inclined connecting thin-wall mild steel plates are connected with welding connecting hinges, a plurality of pull ropes penetrate through the vertical connecting thin-wall mild steel plate and a guardrail rod to be connected, the two ends of the inclined connecting thin-wall mild steel plate and the vertical connecting thin-wall mild steel plate are fixed by fixing bolts, the light thin-wall arched mild steel plate is arranged on the outer side of the high-efficiency energy-consuming thin-wall mild steel plate with the energy-absorbing grooves, and an anti-collision protective pad is arranged on the, The high-strength fixed hinge is connected with the high-strength fixed hinges on two sides of the common fixed hinge through hinge coordination connecting rods, the high-strength fixed hinges are all contacted with light thin-wall arched soft steel plates arranged on the outer sides of the common fixed hinges, SMA coordination limit reset wires are arranged between the adjacent high-strength fixed hinges, the high-strength fixed hinges and the welding connecting hinges for connection, a plurality of high-damping springs are arranged, one ends of the high-strength fixed hinges are connected with the common fixed hinges, the other ends of the high-strength fixed hinges are connected with the vertical connection thin-wall soft steel plates, light energy-consuming materials are arranged in a cavity surrounded by the high-efficiency energy-consuming thin-wall soft steel plates with the energy-absorbing grooves and the light thin-wall arched soft steel plates, a pull rod is arranged, one end of the pull rod is connected with the lower side of the guardrail bar, the other end of the pull rod is connected with the.
The obliquely connected thin-wall mild steel plate, the vertically connected thin-wall mild steel plate and the light thin-wall arched mild steel plate are made of low-yield-point steel plates.
The light energy-consuming material is made of foamed aluminum.
The hinge coordination connecting rod is made of elastic material.
The damping device is made of a flat spring.
Two adjacent oblique connection thin-wall mild steel plates at the middle position on the same side of the guardrail rod share one welding connection hinge.
The invention has the beneficial effects that:
the anti-collision isolation guardrail has strong anti-collision and shock absorption coordinated energy consumption capability, can enable the anti-collision isolation guardrail to fully dissipate collision impact force, acts on an anti-collision protection pad and a light thin-wall arched soft steel plate through the impact force, and extrudes and consumes energy to the high-efficiency energy-consumption thin-wall soft steel plate with an energy absorption groove and a high-damping spring through a high-strength fixed hinge and a common fixed hinge, the set SMA coordinated limiting reset wire and the high-strength fixed hinge are cooperatively stressed to provide stable damping force and a reset function after deformation for the device when the device is deformed, the whole device has good coordinated connection performance, disperses and transmits the impact force, so that the energy consumption efficiency is remarkably improved, the anti-collision isolation guardrail has good use effect and strong practicability, is very suitable for being used as the central anti-collision isolation guardrail of a bidirectional highway, and has the advantages of simple construction, low cost, simple manufacture and convenient disassembly, and can, is beneficial to promoting the industrialization process.
Drawings
FIG. 1 is a schematic structural view of a central highway crash barrier apparatus according to the present invention;
FIG. 2 is a schematic view of a high-efficiency energy-consuming thin-wall mild steel plate with energy-absorbing grooves.
In the figure: 1 is a high-efficiency energy-consumption thin-wall mild steel plate with energy-absorbing grooves; 2 is an oblique connection thin-wall mild steel plate; 3 is a vertical connecting thin-wall mild steel plate; 4 is an energy absorption groove; 5 is an anti-collision protective pad; 6 is a light thin-wall arched mild steel plate; 7 is a guy cable; 8 is a fixing bolt; 9 is an SMA coordination limit reset wire; 10 is a high damping spring; 11 is a light energy-consuming material; 12 is a tension-compression bar; 13 is a damping device; 14 is a high-strength fixed hinge; 15 is a hinge coordination connecting rod; 16 is a common fixed hinge; 17 is a reinforced foundation; 18 is a reinforced base; 19 is a guard rail; 20 is an upper closing plate; 21 is the ground; 22 is a welded connection hinge.
Detailed Description
In order to further illustrate the present invention, the following detailed description of the present invention is given with reference to the accompanying drawings and examples, which should not be construed as limiting the scope of the present invention.
A highway central anti-collision isolation guardrail device is mainly composed of a high-efficiency energy-consumption thin-wall soft steel plate 1 with an energy-absorbing groove, an inclined connection thin-wall soft steel plate 2, a vertical connection thin-wall soft steel plate 3, an energy-absorbing groove 4, an anti-collision protection pad 5, a light thin-wall arched soft steel plate 6, a pull rope 7, a fixing bolt 8, an SMA coordination limit reset wire 9, a high-damping spring 10, a light energy-consumption material 11, a pull rod 12, a shock absorption device 13, a high-strength fixing hinge 14, a hinge coordination connecting rod 15, a common fixing hinge 16, a reinforcement foundation 17, a reinforcement base 18, a guardrail bar 19, an upper sealing plate 20, a ground 21 and a welding connection hinge 22, wherein in the structure of the highway central anti-collision isolation guardrail device, the reinforcement foundation 17 is arranged below the ground 21, the reinforcement base 18 is arranged on the upper part of the reinforcement foundation 17, the guardrail bar 19 is arranged on the upper part of the reinforcement base 18, the left side and the right side of the guardrail rod 19 are respectively provided with a plurality of high-efficiency energy-consumption thin-wall mild steel plates 1 with energy-absorbing grooves, the energy-absorbing grooves 4 of the high-efficiency energy-consumption thin-wall mild steel plates 1 with the energy-absorbing grooves face outwards, the high-efficiency energy-consumption thin-wall mild steel plates 1 with the energy-absorbing grooves are formed by connecting obliquely-connected thin-wall mild steel plates 2 and vertically-connected thin-wall mild steel plates 3, the obliquely-connected thin-wall mild steel plates 2 and the vertically-connected thin-wall mild steel plates 3 form the energy-absorbing grooves 4 in a surrounding manner, the energy-absorbing grooves 4 are trapezoidal grooves, the other ends of the obliquely-connected thin-wall mild steel plates 2 are connected with welding connecting hinges 22, a plurality of guys 7 penetrate through the vertically-connected thin-wall mild steel plates 3 and the guardrail rod 19 to be connected, the two ends of the two are fixed, wherein the light thin-wall arched soft steel plate 6 is connected with the welding connection hinges 22 by welding, a plurality of high-strength fixed hinges 14 are arranged between the adjacent welding connection hinges 22, the high-strength fixed hinges 14 and the welding connection hinges 22 are provided with common fixed hinges 16, the common fixed hinges 16 are connected with the high-strength fixed hinges 14 and the welding connection hinges 22 at the two sides thereof by hinge coordination connecting rods 15, the high-strength fixed hinges 14 are all contacted with the light thin-wall arched soft steel plate 6 arranged at the outer side thereof, SMA coordination limit reset wires 9 are arranged between the adjacent high-strength fixed hinges 14, the high-strength fixed hinges 14 and the welding connection hinges 22 for connection, a plurality of high damping springs 10 are arranged, one end of each high damping spring is connected with the common fixed hinge 16, the other end of each high-strength fixed hinge 14 is connected with the vertical connection thin-wall soft steel plate 3, the light energy-consuming material 11 is arranged in a cavity surrounded by the high-efficiency energy consuming soft steel plate 1 with an energy absorption groove and the light thin-wall arched soft steel plate 6, a tension and compression bar 12 is provided, one end of the tension and compression bar is connected with the lower side of the guardrail bar 19, the other end is connected with the ground 21, and a damping device 13 is arranged on the tension and compression bar 12.
The inclined connecting thin-wall mild steel plate 2, the vertical connecting thin-wall mild steel plate 3 and the light thin-wall arched mild steel plate 6 are made of low-yield-point steel plates.
The light energy dissipation material 11 is made of foamed aluminum.
The hinge coordination connection rod 15 is made of elastic material.
The damper 13 is made of a flat spring.
Two adjacent oblique connection thin-wall mild steel plates 2 at the middle position on the same side of the guardrail rod 19 share one welding connection hinge 22.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a central crashproof isolation barrier device of highway which characterized in that: the energy-saving anti-collision device comprises a high-efficiency energy-consuming thin-wall soft steel plate (1) with energy-absorbing grooves, an anti-collision protection pad (5), a light thin-wall arched soft steel plate (6), a pull rope (7), SMA (shape memory alloy) coordination limit reset wires (9), high-damping springs (10), light energy-consuming materials (11), a pull rod (12), a damping device (13), a high-strength fixing hinge (14), a hinge coordination connecting rod (15), a common fixing hinge (16), a reinforcing foundation (17), a reinforcing base (18), guard bars (19), an upper sealing plate (20) and welding connecting hinges (22), wherein the reinforcing foundation (17) is arranged under the ground, the upper part of the reinforcing foundation (17) is provided with the reinforcing base (18), the guard bars (19) are arranged on the upper part of the reinforcing base (18), the upper sealing plate (20) is arranged on the upper part of the guard bars (19), and a plurality of high-efficiency energy-consuming, the energy-consuming thin-wall mild steel plate (1) with the energy-absorbing grooves is formed by connecting an inclined connecting thin-wall mild steel plate (2) and a vertical connecting thin-wall mild steel plate (3), the inclined connecting thin-wall mild steel plate (2) and the vertical connecting thin-wall mild steel plate (3) enclose the energy-absorbing grooves (4), the energy-absorbing grooves (4) of the energy-consuming thin-wall mild steel plate (1) with the energy-absorbing grooves face outwards, the other end of the inclined connecting thin-wall mild steel plate (2) is connected with a welding connecting hinge (22), the vertical connecting thin-wall mild steel plate (3) is connected with guard rails (19) through inhaul cables (7), two ends of the vertical connecting thin-wall mild steel plate are fixed through fixing bolts (8), a light-weight thin-wall arched mild steel plate (6) is arranged on the outer side of the energy-consuming thin-wall mild steel plate (1) with the energy-absorbing grooves, an anti-collision protection pad (5) is arranged on the outer side, a plurality of high-strength fixed hinges (14) are arranged between adjacent welding connection hinges (22), common fixed hinges (16) are arranged between the high-strength fixed hinges (14) and the high-strength fixed hinges (14), between the high-strength fixed hinges (14) and the welding connection hinges (22), the common fixed hinges (16) are connected with the high-strength fixed hinges (14) and the welding connection hinges (22) at the two sides thereof through hinge coordination connecting rods (15), the high-strength fixed hinges (14) are all contacted with a light thin-wall arched soft steel plate (6) arranged at the outer side of the high-strength fixed hinges, a plurality of high-damping springs (10) are arranged between the adjacent high-strength fixed hinges (14), the high-strength fixed hinges (14), and the welding connection hinges (22) and are connected through SMA coordination limit reset wires (9), one end of each high-damping spring is connected with the common fixed hinges (16), the other end of each high-damping spring is connected with a vertical connection thin-wall soft steel plate (3), and the high-efficiency energy-consuming thin-wall soft steel plate (1) with grooves and the light energy-absorbing thin-wall arched The cavity is internally provided with a light energy consumption material (11), a tension and compression rod (12) is arranged, one end of the tension and compression rod is connected with the lower side of the guardrail rod (19), the other end of the tension and compression rod is connected with the ground, and the tension and compression rod (12) is provided with a damping device (13).
2. The highway central crash barrier device of claim 1, wherein: the obliquely connected thin-wall mild steel plate (2), the vertically connected thin-wall mild steel plate (3) and the light thin-wall arched mild steel plate (6) are made of low-yield-point steel plates.
3. The highway central crash barrier device of claim 1, wherein: the light energy dissipation material (11) is foamed aluminum.
4. The highway central crash barrier device of claim 1, wherein: the hinge coordination connecting rod (15) is an elastic connecting rod.
5. The highway central crash barrier device of claim 1, wherein: the damping device (13) is a flat spring.
6. The highway central crash barrier device of claim 1, wherein: two oblique connection thin-wall mild steel plates (2) which are adjacent to each other at the middle position on the same side of the guardrail rod (19) are connected through a welding connection hinge (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010722325.6A CN111719469A (en) | 2020-07-24 | 2020-07-24 | Anti-collision isolation guardrail device in highway center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010722325.6A CN111719469A (en) | 2020-07-24 | 2020-07-24 | Anti-collision isolation guardrail device in highway center |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111719469A true CN111719469A (en) | 2020-09-29 |
Family
ID=72573411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010722325.6A Pending CN111719469A (en) | 2020-07-24 | 2020-07-24 | Anti-collision isolation guardrail device in highway center |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111719469A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195758A (en) * | 2020-10-25 | 2021-01-08 | 李新旭 | Municipal administration bridge middle part protector |
| CN112761096A (en) * | 2020-12-31 | 2021-05-07 | 南京傲白雪商贸有限公司 | Pier transportation facilities anticollision device |
-
2020
- 2020-07-24 CN CN202010722325.6A patent/CN111719469A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195758A (en) * | 2020-10-25 | 2021-01-08 | 李新旭 | Municipal administration bridge middle part protector |
| CN112761096A (en) * | 2020-12-31 | 2021-05-07 | 南京傲白雪商贸有限公司 | Pier transportation facilities anticollision device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2012022016A1 (en) | Safety protection apparatus of elastic-plastic steel structure | |
| CN110004852B (en) | Assembled road barrier structure with shock attenuation power consumption effect | |
| CN111719469A (en) | Anti-collision isolation guardrail device in highway center | |
| CN111236112A (en) | Elastic buffer device for anti-collision guardrail for bridge and implementation method thereof | |
| CN207314176U (en) | A kind of cantilever shed tunnel applied to Bang Shan highways | |
| CN100590268C (en) | Drop-prevention stayed cable and anchorage system capable of being used for high road or bridge | |
| CN212426889U (en) | Anti-collision isolation guardrail device in highway center | |
| CN106638388A (en) | Energy-absorbing anti-collision safe guard fence | |
| CN209975419U (en) | Special anticollision barrier of assembled road | |
| CN210194494U (en) | Assembled road hard shoulder structure with shock attenuation power consumption effect | |
| CN210737428U (en) | Urban road crosses street island anticollision energy-absorbing structure | |
| CN209975422U (en) | Assembled reinforced protection isolation guardrail | |
| CN209975420U (en) | Assembled light energy consumption guardrail | |
| CN112144449A (en) | Piston type energy-consumption protective fence | |
| CN111719465A (en) | Combined anti-collision guardrail structure | |
| CN210597123U (en) | Urban road is with crashproof energy-absorbing post structure | |
| CN210066591U (en) | Combined type traffic guardrail | |
| CN108547240B (en) | Series-connection slidable highway anti-collision guardrail | |
| CN214116398U (en) | Piston type energy-consumption protective fence | |
| CN209975423U (en) | Assembled anti-collision fence of soft bending extrusion energy dissipation plate | |
| CN112012137A (en) | Highway safety protective guard | |
| CN212426886U (en) | Road isolation fence with built-in coordinated energy consumption combined structure | |
| CN212582520U (en) | Combined anti-collision guardrail structure | |
| CN110714418A (en) | Energy-consuming shed tunnel capable of generating plastic deformation and maintenance method thereof | |
| CN213538784U (en) | Bridge protection device for municipal construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |