CN111236737A - Buffering formula anticollision warning guardrail is used in road and bridge construction - Google Patents
Buffering formula anticollision warning guardrail is used in road and bridge construction Download PDFInfo
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- CN111236737A CN111236737A CN202010025933.1A CN202010025933A CN111236737A CN 111236737 A CN111236737 A CN 111236737A CN 202010025933 A CN202010025933 A CN 202010025933A CN 111236737 A CN111236737 A CN 111236737A
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- buffer
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
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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
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/658—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing
- E01F9/669—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing for fastening to safety barriers or the like
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
- E04H17/16—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention relates to the technical field of road construction equipment, and discloses a buffer type anti-collision warning guardrail for road and bridge construction, which comprises a bottom plate, a vertical plate and a first buffer rod, wherein the bottom plate is provided with a first buffer rod; the middle part of the upper surface of the bottom plate is provided with a vertical plate in the front-back direction, and the right side surface of the vertical plate is provided with a plurality of groups of transverse cavities and protection plates at equal intervals in the front-back direction; the lower part symmetry rotates on both sides around the left surface of guard plate and is connected with two sets of second buffer rods, and the left surface middle part of guard plate is connected with the detached first buffer rod in ascending lower both sides to the left turn, and the bottom of first buffer rod rotates and is connected with the movable block that slides on the riser right flank, and the right side fixedly connected with of depression bar is the push rod of U type structure, and there is a set of connecting rod on the right side of push rod through spring elastic connection, and the inside fixed mounting that the end of connecting rod stretches out the transverse cavity has the protection hammer block. The invention has the advantages that: the buffer effect is excellent, has the effect of preventing overturning, and has higher use value.
Description
Technical Field
The invention relates to the technical field of road construction equipment, in particular to a buffer type anti-collision warning guardrail for road and bridge construction.
Background
The construction guardrail is generally commonly used on common roads, and the highway also has various levels of highway crossroads, toll stations, bridges, parking lots, stations, wharfs, dangerous areas and road construction sections, and places such as temporary barriers of meeting places are used as road lanes, area enclosure safety isolation, diversion and guidance or used in celebration event occasions of some books.
Chinese patent (publication No. CN 109267819A, bulletin date: 2019.01.25) discloses an anti-collision warning guardrail for road and bridge construction, which comprises a U-shaped frame, a concrete base and a rubber anti-collision plate, wherein the upper surface of the concrete base is connected with the U-shaped frame, mounting grooves are respectively formed in the upper end and the lower end of the U-shaped frame, second damping devices are arranged in the mounting grooves, the upper inner wall and the lower inner wall of the U-shaped frame are in contact with third damping devices, the third damping devices are connected with a moving rod, the upper end and the lower end of the moving rod are respectively connected with sliding blocks, two first damping devices which are symmetrically arranged are connected to the right side of the moving rod, and workers fix the device outside a construction range when constructing a road and bridge. The guardrail only simply carries out the alleviation of the impact force to some vehicles which have accidents, can not fully reduce the severity of the accidents, and can easily tip over when impacting a buffer device to some vehicles with higher running speed to cause serious consequences, so that the practical application effect of the guardrail is general, and the application range is limited.
Disclosure of Invention
The invention aims to provide a buffer type anti-collision warning guardrail for road and bridge construction, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a buffer type anti-collision warning guardrail for road and bridge construction comprises a bottom plate, a vertical plate and a first buffer rod; the middle part of the upper surface of the bottom plate is provided with a vertical plate in the front-back direction, and the right side surface of the vertical plate is provided with a plurality of groups of transverse cavities and protection plates at equal intervals in the front-back direction; lower part symmetry rotation is connected with two sets of second buffer rods on both sides around the left surface of guard plate, the bottom of second buffer rod is rotated and is connected with sliding connection on the inside fly leaf of buffer seat, the left surface middle part of guard plate is connected to the first buffer rod of detached upper and lower both sides to the left rotation, the bottom of first buffer rod is rotated and is connected with the movable block of slip on the riser right flank, be located and carry out elastic connection through the spring between the inside movable block of riser, spring elastic connection is passed through in the bottom of riser in the movable block bottom of downside, when the guard plate receives pressure left, compress left through first buffer rod, make the movable block remove to upper and lower both sides, thereby alleviate the guard plate. Through the inside first buffer beam that sets up in the left side of guard plate, both sides set up the second buffer beam, first buffer beam and second buffer beam combined action, and then abundant pressure that alleviates the guard plate and receive. A set of vertical ejector pin has upwards been placed at the top that is located the movable block of upside, and the lower wall that the cross chamber was passed on the top of ejector pin stretches into the cross chamber to a set of depression bar of fixedly connected with, baffle fixed mounting has a set of buffering frame at the top of depression bar, and the top left and right sides sliding connection of buffering frame is on the traveller, and the top sliding connection of traveller is in seting up the spout in the cross chamber upper wall, and spring elastic connection is passed through on the bottom surface at the buffering frame in the bottom of traveller. When the guard plate does not receive pressure, under the effect of the inside spring of buffer frame, the bottom of depression bar stretches into the inside of riser to block the buffer frame through the depression bar and fix it, the right side fixedly connected with of depression bar is the push rod of U type structure, and there is a set of connecting rod on the right side of push rod through spring elastic connection, and the inside fixed mounting that the end of connecting rod stretches out horizontal chamber has the protection hammer block for block the afterbody that strikes the vehicle on the guard plate, prevent that it from taking place the condition of tumbling. The push rod is clamped to move rightwards by stretching the press rod into the vertical plate, then the spring between the push rod and the connecting rod is pulled by the push rod to be in a stretching state, and then the protective hammer body on the right side is tightly attached to the right side face of the transverse cavity. When the guard plate is receiving left pressure, can extrude the movable block through first buffer lever left, thereby order about the movable block rebound of upside, then push the bottom of depression bar into the cross cavity through the ejector pin, then the push rod loses the resistance left, release connecting rod and the terminal protection hammer block of connecting rod right under the effect of spring, thereby when the guard plate receives the anterior striking of vehicle, through the transmission of striking power, will protect the hammer block and push out right, thereby block that the afterbody of vehicle takes place the upset, thereby reduce the severity of accident.
As a further scheme of the invention: the left side and the right side of the bottom plate are fixedly arranged on the ground through two groups of expansion bolts.
As a further scheme of the invention: the outer surface of the protection plate is provided with a layer of rubber pad for reducing direct contact damage between the protection plate and a vehicle in collision.
As a further scheme of the invention: buffer seat fixed mounting is on the right side outer wall of riser, and the upper and lower both sides of fly leaf pass through spring elastic connection in the inside of buffer seat, when the guard plate receives pressure left, extrudees the fly leaf left through the second buffer beam, and then makes the inside spring of buffer seat compress and tensile to reduce the impact that the guard plate received.
As a further scheme of the invention: the bottom of the left side face of the movable block is fixedly provided with a slide bar, the slide bar is connected in a slide rail arranged on the inner wall on the left side of the vertical plate in a sliding mode, the slide bar is arranged through the movable block to slide up and down on the slide rail, and therefore the stability of the movable block when the movable block is moved up and down under pressure is improved.
As a further scheme of the invention: the middle part of the pressing rod vertically penetrates through a group of limiting plates, the left side of each limiting plate is fixedly provided with a mounting plate, the top of each mounting plate is slidably connected into the corresponding chute, and the limiting plates are used for stabilizing the stability of the middle part of the pressing rod.
As a further scheme of the invention: the protective hammer body is provided with a semicircular structure.
As a further scheme of the invention: the outer surface of the protective hammer body is also wrapped with a layer of rubber pad.
As a still further scheme of the invention: carry out fixed connection through a set of buffer block that is the right triangle structure between the downside in horizontal chamber and the right side of riser, the buffer block is when improving to be connected stably between horizontal chamber and the riser, also can reduce the vehicle when striking the downside in horizontal chamber, the damage that receives.
Compared with the prior art, the invention has the beneficial effects that: the first buffer rod is arranged inside the left side of the protection plate, the second buffer rods are arranged on the two sides of the protection plate, and the first buffer rod and the second buffer rods act together to further fully relieve the pressure on the protection plate;
through utilizing the guard plate to receive the removal that accident vehicle striking buffering drove the movable block and take place, make the depression bar at movable block top break away from the riser, then with the terminal protection hammer block of horizontal chamber right removal, and then the afterbody that blocks the accident vehicle upwards tumbles to reduce the severity of accident, this kind of mode is abundant utilizes the inside connection effect of this guardrail, then will act on the maximize, thereby played unexpected effect, had high value of utilization.
The invention has the advantages that: the buffering effect is splendid, has the effect of preventing tumbling, and the inner structure's of full play guardrail advantage has higher use value.
Drawings
Fig. 1 is a schematic view of the interior structure of a buffer type anti-collision warning guardrail for road and bridge construction.
Fig. 2 is an enlarged schematic structural diagram of a1 in fig. 1.
FIG. 3 is a schematic structural diagram of a protection plate in a buffer type anti-collision warning guardrail for road and bridge construction.
Wherein: the device comprises a base plate 10, a vertical plate 11, a sliding rail 12, a protection plate 13, a first buffer rod 14, a second buffer rod 15, a movable block 16, a sliding rod 17, a spring 18, a buffer seat 19, a movable plate 20, a top rod 21, a transverse cavity 22, a protective hammer body 23, a connecting rod 24, a push rod 25, a sliding groove 26, a mounting plate 27, a pressure rod 28, a limiting plate 29 and a buffer frame 30.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example one
Referring to fig. 1-3, a buffering type anti-collision warning guardrail for road and bridge construction comprises a bottom plate 10, a vertical plate 11 and a first buffering rod 14; the left side and the right side of the bottom plate 10 are fixedly arranged on the ground through two groups of expansion bolts, a vertical plate 11 in the front-back direction is arranged in the middle of the upper surface of the bottom plate 10, and a plurality of groups of transverse cavities 22 and protection plates 13 are arranged on the right side surface of the vertical plate 11 in the front-back direction at equal intervals; the outer surface of the fender 13 is provided with a rubber pad for reducing damage caused by direct contact between the fender 13 and a vehicle in collision. Lower part symmetry rotation is connected with two sets of second buffer rods 15 on both sides around the left surface of guard plate 13, the bottom rotation of second buffer rod 15 is connected with sliding connection on the inside fly leaf 20 of buffer seat 19, buffer seat 19 fixed mounting is on the right side outer wall of riser 11, spring 18 elastic connection is passed through in the inside of buffer seat 19 in the upper and lower both sides of fly leaf 20, when guard plate 13 receives pressure left, extrude fly leaf 20 left through second buffer rod 15, and then make the inside spring 18 of buffer seat 19 compress and tensile, thereby reduce the impact that guard plate 13 received. The left surface middle part of guard plate 13 is connected with the first buffer pole 14 that has divided to upper and lower both sides to the left rotation, the bottom of first buffer pole 14 is rotated and is connected with the movable block 16 of slip on the riser 11 right flank, be located and carry out elastic connection through spring 18 between the movable block 16 of riser 11 inside, the bottom of 18 elastic connection at riser 11 is passed through to the movable block 16 bottom of downside, when guard plate 13 receives pressure left, compress left through first buffer pole 14, make movable block 16 both sides removal from top to bottom, thereby alleviate guard plate 13. A sliding rod 17 is fixedly mounted at the bottom of the left side face of the movable block 16, the sliding rod 17 is connected in a sliding rail 12 arranged on the inner wall of the left side of the vertical plate 11 in a sliding mode, the sliding rod 17 is arranged on the movable block 16 to slide up and down on the sliding rail 12, and therefore the left and right stability of the movable block 16 when the movable block is stressed to move up and down is improved. Through the inside first buffer beam 14 that sets up in the left side of guard plate 13, both sides set up second buffer beam 15, first buffer beam 14 and second buffer beam 15 combined action, and then the abundant pressure that alleviates guard plate 13 and receive.
A set of vertical ejector pin 21 has upwards been placed at the top that is located the movable block 16 of upside, the lower wall that violently chamber 22 was passed on the top of ejector pin 21 stretches into violently chamber 22, and a set of depression bar 28 of fixedly connected with, baffle fixed mounting has a set of buffer frame 30 through the top of depression bar 28, the top left and right sides sliding connection of buffer frame 30 is on the traveller, the top sliding connection of traveller is in seting up the spout 26 in violently chamber 22 upper wall, the bottom of traveller passes through spring 18 elastic connection at the bottom surface of buffer frame 30. When the guard plate 13 does not receive pressure, under the effect of the inside spring 18 of buffer frame 30, the bottom of depression bar 28 stretches into the inside of riser 11 to block buffer frame 30 through depression bar 28 and fix it, the vertical passing in middle part of depression bar 28 has a set of limiting plate 29, and the left side fixed mounting of limiting plate 29 has the mounting panel 27 of top sliding connection in spout 26, and the setting of limiting plate 29 is used for the stability in firm depression bar 28 middle part. The right side fixedly connected with of depression bar 28 is the push rod 25 of U type structure, and the right side of push rod 25 has a set of connecting rod 24 through spring 18 elastic connection, and the inside fixed mounting that the terminal of connecting rod 24 stretches out horizontal chamber 22 has protection hammer block 23, and protection hammer block 23 sets up semi-circular structure for block the afterbody of the vehicle that strikes on guard plate 13, prevent that it from taking place the condition of overturning. The push rod 25 is clamped to move rightwards by the extension of the pressure rod 28 into the vertical plate 11, then the spring 18 between the push rod 25 and the connecting rod 24 is pulled by the push rod 25 to be in a stretching state, and then the protective hammer body 23 on the right side tightly abuts against the right side surface of the transverse cavity 22. The outer surface of the protective hammer body 23 is also wrapped with a layer of rubber pad. When the protection plate 13 is pressed leftwards, the movable block 16 is pressed leftwards through the first buffer rod 14, so that the upper movable block 16 is driven to move upwards, then the bottom of the pressure rod 28 is pushed into the transverse cavity 22 through the ejector rod 21, then the left resistance is lost through the push rod 25, the connecting rod 24 and the protective hammer body 23 at the tail end of the connecting rod 24 are pushed rightwards under the action of the spring 18, so that the protective hammer body 23 is pushed rightwards through the transmission of the impact force while the protection plate 13 is impacted by the front part of the vehicle, the tail part of the vehicle is prevented from being overturned, and the severity of the accident is reduced.
The working principle of the invention is as follows: firstly, the base plate 10 is arranged at a required position, then a plurality of groups of protection plates 13 and transverse cavities 22 which are distributed up and down are respectively arranged on the right side surface of the vertical plate 11 at equal intervals, when the protection plates 13 are impacted by a vehicle, the damage to the vehicle is sufficiently reduced by the common buffer action of the first buffer rods 14 and the second buffer rods 15 on the left side of the protection plates 13, then the movable blocks 16 on the upper side of the bottoms of the first buffer rods 14 move upwards while being impacted and compressed, the pressure rods 28 on the tops of the ejector rods 21 are pushed to be separated from the inside of the vertical plate 11, then under the action of the springs 18 between the push rods 25 and the connecting rods 24, the protection hammer bodies 23 at the tail ends of the connecting rods 24 extend outwards, so that the possibility that the tail part of the vehicle in an accident tips upwards is prevented, the severity of the accident is reduced, and after the accident is cleared, the protection hammer bodies 23 are, the bottom of the strut 28 is then again extended into the riser 11 for securement.
Example two
On the basis of embodiment one, carry out fixed connection through a set of buffer that is the right triangle structure between the downside of horizontal chamber 22 and the right side of riser 11, the buffer is improved and is connected stably between horizontal chamber 22 and the riser 11, also can reduce the vehicle when striking the downside of horizontal chamber 22, the damage that receives.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (10)
1. A buffer type anti-collision warning guardrail for road and bridge construction comprises a bottom plate (10), a vertical plate (11) and a first buffer rod (14); the middle part of the upper surface of the bottom plate (10) is provided with a vertical plate (11) in the front-back direction, and the middle part of the upper surface of the bottom plate (10) is provided with a plurality of groups of transverse cavities (22) and protection plates (13) at equal intervals in the front-back direction; the upper and lower parts of the front and rear sides of the left side surface of the protection plate (13) are symmetrically and rotatably connected with two groups of second buffer rods (15), the bottom ends of the second buffer rods (15) are rotatably connected with a movable plate (20) which is slidably connected inside a buffer seat (19), the middle part of the left side surface of the protection plate (13) is rotatably connected with a first buffer rod (14) which is separated from the upper side and the lower side towards the left side, the bottom end of the first buffer rod (14) is rotatably connected with a movable block (16) which slides on the right side surface of a vertical plate (11), the movable blocks (16) positioned inside the vertical plate (11) are elastically connected through springs (18), the bottom of the movable block (16) at the lower side is elastically connected with the bottom of the vertical plate (11) through the springs (18), a group of vertical push rods (21) is upwards placed at the top of the movable block (16) positioned at the upper side, and the top ends of the, and a set of depression bar of fixedly connected with (28), baffle fixed mounting has a set of buffer frame (30) at the top of depression bar (28), the top left and right sides sliding connection of buffer frame (30) is on the traveller, the top sliding connection of traveller is in offering spout (26) in horizontal chamber (22) upper wall, spring (18) elastic connection is passed through on the bottom surface of buffer frame (30) in the bottom of traveller, the right side fixedly connected with of depression bar (28) is push rod (25) of U type structure, spring (18) elastic connection is passed through on the right side of push rod (25) has a set of connecting rod (24), the inside fixed mounting that the end of connecting rod (24) stretches out horizontal chamber (22) has protection hammer body (23).
2. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 1, wherein the left and right sides of the bottom plate (10) are fixedly installed on the ground through two sets of expansion bolts.
3. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 2, wherein a layer of rubber pad is arranged on the outer surface of the protection plate (13).
4. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 3, wherein the buffer seat (19) is fixedly installed on the outer wall of the right side of the vertical plate (11), and the upper side and the lower side of the movable plate (20) are elastically connected inside the buffer seat (19) through the spring (18).
5. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 4, wherein a sliding rod (17) is fixedly installed at the bottom of the left side surface of the movable block (16), and the sliding rod (17) is slidably connected in a sliding rail (12) arranged on the inner wall of the left side of the vertical plate (11).
6. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 5, wherein a group of limiting plates (29) vertically penetrate through the middle part of the compression bar (28).
7. A buffer type anti-collision warning guardrail for road and bridge construction according to claim 6, wherein a mounting plate (27) with the top part connected in the chute (26) in a sliding way is fixedly arranged at the left side of the location plate (29).
8. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 2, wherein the protection hammer body (23) is provided with a semicircular structure.
9. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 8, wherein the outer surface of the protection hammer body (23) is wrapped with a layer of rubber pad.
10. The buffer type anti-collision warning guardrail for the road and bridge construction as claimed in claim 1 or 2, wherein the lower side of the transverse cavity (22) is fixedly connected with the right side of the vertical plate (11) through a group of buffer blocks in a right-angled triangle structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025933.1A CN111236737B (en) | 2020-01-10 | 2020-01-10 | Buffering formula anticollision warning guardrail is used in road and bridge construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025933.1A CN111236737B (en) | 2020-01-10 | 2020-01-10 | Buffering formula anticollision warning guardrail is used in road and bridge construction |
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| CN111236737A true CN111236737A (en) | 2020-06-05 |
| CN111236737B CN111236737B (en) | 2021-04-09 |
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| CN202010025933.1A Active CN111236737B (en) | 2020-01-10 | 2020-01-10 | Buffering formula anticollision warning guardrail is used in road and bridge construction |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459612A (en) * | 2020-12-31 | 2021-03-09 | 汤炬 | Safety device is used in construction of engineering road that anti striking performance is high |
| CN112523132A (en) * | 2020-11-26 | 2021-03-19 | 曹少华 | Anti-collision buffer device for traffic transportation protective facilities |
| CN112832151A (en) * | 2020-12-31 | 2021-05-25 | 刘付宾 | Danger warning device with collision counteracting structure for road traffic transportation |
| CN113323503A (en) * | 2021-06-18 | 2021-08-31 | 国网江西综合能源服务有限公司 | Assembled enclosure |
| CN113832895A (en) * | 2021-11-04 | 2021-12-24 | 王志坚 | Road and bridge bend device of saving oneself that overturns of protection vehicle safety |
| CN113830317A (en) * | 2021-11-01 | 2021-12-24 | 徐业春 | Unmanned aerial vehicle survey and drawing on-site device of collecting evidence convenient to maintain |
| CN113882254A (en) * | 2021-09-15 | 2022-01-04 | 深圳市综合交通设计研究院有限公司 | Based on road and bridge construction is with buffering formula anticollision warning guardrail |
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| EP1710353A1 (en) * | 2005-04-07 | 2006-10-11 | Hierros y Aplanaciones, S.A. (HIASA) | Deformable separator device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523132A (en) * | 2020-11-26 | 2021-03-19 | 曹少华 | Anti-collision buffer device for traffic transportation protective facilities |
| CN112459612A (en) * | 2020-12-31 | 2021-03-09 | 汤炬 | Safety device is used in construction of engineering road that anti striking performance is high |
| CN112832151A (en) * | 2020-12-31 | 2021-05-25 | 刘付宾 | Danger warning device with collision counteracting structure for road traffic transportation |
| CN113323503A (en) * | 2021-06-18 | 2021-08-31 | 国网江西综合能源服务有限公司 | Assembled enclosure |
| CN113882254A (en) * | 2021-09-15 | 2022-01-04 | 深圳市综合交通设计研究院有限公司 | Based on road and bridge construction is with buffering formula anticollision warning guardrail |
| CN113830317A (en) * | 2021-11-01 | 2021-12-24 | 徐业春 | Unmanned aerial vehicle survey and drawing on-site device of collecting evidence convenient to maintain |
| CN113830317B (en) * | 2021-11-01 | 2023-10-13 | 徐业春 | Unmanned aerial vehicle survey and drawing scene evidence obtaining device convenient to maintain |
| CN113832895A (en) * | 2021-11-04 | 2021-12-24 | 王志坚 | Road and bridge bend device of saving oneself that overturns of protection vehicle safety |
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| CN111236737B (en) | 2021-04-09 |
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