CN111321670A - Movable protective device for bridge engineering construction - Google Patents
Movable protective device for bridge engineering construction Download PDFInfo
- Publication number
- CN111321670A CN111321670A CN202010178467.0A CN202010178467A CN111321670A CN 111321670 A CN111321670 A CN 111321670A CN 202010178467 A CN202010178467 A CN 202010178467A CN 111321670 A CN111321670 A CN 111321670A
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- Prior art keywords
- frame
- threaded rod
- base
- engineering construction
- bridge engineering
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/18—Scaffolds primarily resting on the ground adjustable in height
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/24—Scaffolds primarily resting on the ground comprising essentially special base constructions; comprising essentially special ground-engaging parts, e.g. inclined struts, wheels
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention particularly relates to a movable protection device for bridge engineering construction, which solves the problems of low safety coefficient and low operation efficiency of the existing steel pipe building platform in use. A movable protection device for bridge engineering construction is disclosed, wherein a protection platform comprises a support plate and a protection frame; the lifting device comprises a scissor-type lifting frame, two upper connecting seats and two lower connecting seats; the lower surface of the supporting plate is provided with a sliding rod, the sliding rod is sleeved with a sliding block, and the two upper connecting seats are respectively fixed on the lower surfaces of the two sliding blocks; the upper surface of the base is provided with a threaded rod, and the two lower connecting seats are in threaded connection with the side surface of the threaded rod; the rear of fixed block is provided with the motor, and the right-hand member portion fixed mounting of motor output shaft has the driving gear, and the fixed mounting has driven gear on the threaded rod. The invention realizes the purpose that the height of the protective device is flexibly adjusted along with the construction progress, can effectively ensure the personal safety of operators, is simple and convenient to operate and effectively improves the construction efficiency.
Description
Technical Field
The invention relates to a protection device for bridge engineering, in particular to a movable protection device for bridge engineering construction.
Background
In bridge engineering, construction is divided into substructure construction, superstructure construction, beam bridge construction, and the like. Among them, the platform constructed by steel pipes is commonly used in the construction of lower structures (such as bridge abutment and abutment foundation).
However, practice shows that the existing steel pipe building platform has the following problems in use: firstly, the platform built by the steel pipes is simple in structure, insufficient in firmness, poor in stability, low in safety factor, easy to cause safety accidents, and incapable of guaranteeing personal safety of operating personnel; secondly, the platform of setting up at every turn can only be used for the construction operation of specific height, and after the altitude change of pier, need set up the platform again to adjustment platform height adapts to the construction progress, wastes time and energy, and it is not convenient enough to use, influences the construction progress, leads to the operating efficiency low.
Disclosure of Invention
The invention provides a movable protection device for bridge engineering construction, which aims to solve the problems of low safety coefficient and low operation efficiency of the existing steel pipe building platform in use.
The invention is realized by adopting the following technical scheme:
a mobile protective device for bridge engineering construction comprises a bridge pier; the device also comprises a horizontally placed base, a protection platform positioned above the base and a lifting device positioned between the protection platform and the base;
the lower surface of the base is provided with a plurality of travelling wheels;
the protection platform comprises a support plate horizontally arranged right above the base and a protection frame vertically arranged on the edge of the support plate, the bridge pier is arranged in front of the protection frame, the left side and the right side of the protection frame are vertically provided with a connecting plate placed along the front-back direction, the front end parts of the two connecting plates are respectively provided with two electric push rods which are positioned in front of the protection frame and symmetrically placed along the left-right direction, and the push rods of the two electric push rods are both towards the bridge pier;
the lifting device comprises a scissor-type lifting frame; the upper ends of two shearing arms of the shearing fork type lifting frame are respectively hinged with two upper connecting seats, and the lower ends of the two shearing arms are respectively hinged with two lower connecting seats with assembling screw holes;
the middle part of the lower surface of the supporting plate is provided with a sliding chute, a sliding rod is arranged between the left side wall and the right side wall of the sliding chute, two sliding blocks capable of sliding left and right are sleeved on the sliding rod, and two upper connecting seats are respectively fixed on the lower surfaces of the two sliding blocks; the left end and the right end of the lower surface of the supporting plate are respectively provided with a supporting block, and a telescopic rod which is arranged along the left-right direction is respectively arranged between the upper connecting seat positioned on the left side and the supporting block positioned on the left side and between the upper connecting seat positioned on the right side and the supporting block positioned on the right side;
the upper surface of the base is provided with two fixed blocks which are distributed left and right, a rotatable threaded rod is arranged between the two fixed blocks, the thread directions of the left part and the right part of the side surface of the threaded rod are opposite, and the two lower connecting seats are respectively in threaded connection with the left part and the right part of the side surface of the threaded rod; the rear that is located left fixed block is provided with the motor that an output shaft direction is towards the right side, and the right-hand member portion of motor output shaft is fixed to be equipped with a driving gear, and the left end portion of threaded rod is fixed to be equipped with one with driving gear engaged with driven gear.
When the device works, the protective device is pushed to a construction pier through the traveling wheels, then the two electric push rods are started, and the distance between the two push rods is adjusted until the two push rods are close to the side face of the pier, so that the protective device is prevented from shaking in the lifting process; then starter motor, the motor output shaft rotates and drives the driving gear and rotate, then, drive driven gear and rotate, driven gear rotates and drives the threaded rod and rotate, drive two lower connecting seats and move in opposite directions from this, two connecting seats move in opposite directions on driving under the connecting rod effect of cutting the arm of fork crane two after that, meanwhile, two sliders slide in opposite directions along the slide bar, with the resistance that reduces two and go up the connecting seat motion, the length extension of two telescopic rods, make two the side-to-side motion of going up the connecting seat more stable, thereby realize cutting the rising of fork crane, promote protection platform to the target height, accomplish this protector's installation from this. In the use, when the construction height changes, only need the starter motor once more, through driving gear, driven gear, threaded rod, lower connecting seat, go up a series of transmissions of connecting seat, adjust the height of protection platform to the change of adaptation construction height need not build the device again, has effectively improved the operating efficiency. The invention solves the problems of low safety coefficient and low operation efficiency of the existing steel pipe building platform in use.
The outer end part of the push rod of each electric push rod is provided with a roller which rolls on the side wall of the pier along the front-back direction.
This structural design makes things convenient for protective frame and pier contact, and easy operation is convenient.
The protective frame is of a rectangular structure; a protection plate is arranged right above the protection frame, and the protection frame and the protection plate are connected through a plurality of support rods arranged on the upper surfaces of the left frame and the right frame of the protection frame; every connecting plate all is connected through two connecting rods with the protective frame.
The guard plate can provide the guard action for the operation personnel, avoids falling the stone in the work progress to cause the injury to the operation personnel, has further improved this protector's security.
Each telescopic link is telescopic tube, and the left end portion and the right end portion of every telescopic link are all fixed the cover and are equipped with a snap ring, the outside all is equipped with a reset spring who is located between two snap rings.
Reset spring makes the horizontal slip of going up the connecting seat link up more stably, and then has increased the stability of this protector lift in-process.
The left side and the right side of the base are both horizontally provided with a fixed lug plate, and each fixed lug plate is in threaded connection with a positioning pin which penetrates up and down; the number of the travelling wheels is four; the four walking wheels are respectively arranged at four corners of the lower surface of the base.
The walking wheel realizes the flexible movement of the protective device, and the positioning pin can stably fix the protective device on the ground, thereby ensuring the stability of the whole device in use.
The upper surface of the base is horizontally provided with a supporting plate with a guide ball groove, and the guide ball groove is arranged along the left and right direction; every lower connecting seat all installs a ball through the arc connecting block, and two balls all roll the assembly in the direction ball groove of layer board.
Ball and direction ball groove can be on guaranteeing two bases of connecting seat steady motion down, for two connecting seats provide the supporting role down, and then promoted this protector's structural firmness, increased this protector's life.
Two fixed blocks are respectively fixed with a sleeve, and two ends of the threaded rod are respectively rotatably arranged in the two sleeves in a penetrating way; three baffle rings which are distributed at equal intervals are arranged on the side surface of the threaded rod in an extending mode, the driven gear is fixedly sleeved on the baffle ring on the left side, and the two lower connecting seats and the three baffle rings are arranged in a staggered mode; the parts between the three baffle rings on the side surface of the threaded rod are threaded surfaces, and the rest parts on the side surface of the threaded rod are smooth surfaces.
The stop ring can provide limiting effect for the motion of two lower connecting seats, and then the accuracy of the protection device for controlling the height of the protection platform is improved.
The height-adjustable safety device is reasonable and reliable in structural design, achieves the purpose that the height of the protection device is flexibly adjusted along with the construction progress, is high in safety factor, can effectively guarantee the personal safety of operating personnel, is simple and convenient to operate, effectively improves the construction efficiency, and further has the advantages of being firm in structure, good in stability in the use process, accurate in height control and long in service life.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged partial schematic view at A of FIG. 1;
fig. 3 is a top view of the base of the present invention.
In the figure, 1-base, 2-road wheel, 3-support plate, 4-protective frame, 5-connecting plate, 6-electric push rod, 7-scissor type lifting frame, 8-upper connecting seat, 9-lower connecting seat, 10-sliding groove, 11-sliding rod, 12-sliding block, 13-supporting block, 14-telescopic rod, 15-fixed block, 16-threaded rod, 17-motor, 18-driving gear, 19-driven gear, 20-roller, 21-protective plate, 22-supporting rod, 23-connecting rod, 24-snap ring, 25-reset spring, 26-fixed lug plate, 27-positioning pin, 28-supporting plate, 29-arc connecting block, 30-ball, 31-sleeve and 32-retaining ring.
Detailed Description
A mobile protective device for bridge engineering construction comprises a bridge pier; the device also comprises a horizontally placed base 1, a protection platform positioned above the base 1 and a lifting device positioned between the protection platform and the base;
the lower surface of the base 1 is provided with a plurality of travelling wheels 2;
the protective platform comprises a supporting plate 3 horizontally arranged right above the base 1 and a protective frame 4 vertically arranged on the edge of the supporting plate 3, the bridge pier is arranged in front of the protective frame 4, the left side and the right side of the protective frame 4 are both vertically provided with a connecting plate 5 placed along the front-back direction, the front end parts of the two connecting plates 5 are respectively provided with two electric push rods 6 which are positioned in front of the protective frame 4 and symmetrically placed along the left-right direction, and the push rods of the two electric push rods 6 are both towards the bridge pier;
the lifting device comprises a scissor type lifting frame 7; the upper ends of two scissor arms of the scissor type lifting frame 7 are respectively hinged with two upper connecting seats 8, and the lower ends of the two scissor arms are respectively hinged with two lower connecting seats 9 with assembling screw holes;
a sliding groove 10 is formed in the middle of the lower surface of the supporting plate 3, a sliding rod 11 is arranged between the left side wall and the right side wall of the sliding groove 10, two sliding blocks 12 capable of sliding left and right are sleeved on the sliding rod 11, and two upper connecting seats 8 are respectively fixed to the lower surfaces of the two sliding blocks 12; a supporting block 13 is arranged at the left end part and the right end part of the lower surface of the supporting plate 3, and a telescopic rod 14 arranged along the left-right direction is arranged between the upper connecting seat 8 positioned on the left side and the supporting block 13 positioned on the left side and between the upper connecting seat 8 positioned on the right side and the supporting block 13 positioned on the right side;
the upper surface of the base 1 is provided with two fixed blocks 15 which are distributed left and right, a rotatable threaded rod 16 is arranged between the two fixed blocks 15, the left part and the right part of the side surface of the threaded rod 16 are opposite in thread direction, and the two lower connecting seats 9 are respectively in threaded connection with the left part and the right part of the side surface of the threaded rod 16; a motor 17 with an output shaft facing right is arranged behind the fixed block 15 on the left side, a driving gear 18 is fixedly assembled at the right end of the output shaft of the motor 17, and a driven gear 19 meshed with the driving gear 18 is fixedly assembled at the left end of the threaded rod 16.
The outer end part of the push rod of each electric push rod 6 is provided with a roller 20 which rolls on the side wall of the pier along the front-back direction.
The protective frame 4 is of a rectangular structure; a protection plate 21 is arranged right above the protection frame 4, and the protection frame 4 and the protection plate 21 are connected through a plurality of support rods 22 arranged on the upper surfaces of the left frame and the right frame of the protection frame 4; each connecting plate 5 is connected with the protective frame 4 through two connecting rods 23.
Each telescopic link 14 is telescopic tube, and the left end portion and the right end portion of every telescopic link 14 are all fixed the cover and are equipped with a snap ring 24, the outside all is equipped with a reset spring 25 that is located between two snap rings 24.
The left side and the right side of the base 1 are both horizontally provided with a fixed lug plate 26, and each fixed lug plate 26 is in threaded connection with a positioning pin 27 which penetrates up and down; the number of the travelling wheels 2 is four; the four walking wheels 2 are respectively arranged at four corners of the lower surface of the base 1.
A supporting plate 28 with a guide ball groove is horizontally arranged on the upper surface of the base 1, and the guide ball groove is arranged along the left-right direction; each lower connecting seat 9 is provided with a ball 30 through an arc-shaped connecting block 29, and the two balls 30 are assembled in the guide ball grooves of the supporting plate 28 in a rolling manner.
Two fixed blocks 15 are respectively fixed with a sleeve 31, and two ends of the threaded rod 16 are respectively rotatably arranged in the two sleeves 31 in a penetrating way; three baffle rings 32 which are distributed at equal intervals extend from the side surface of the threaded rod 16, the driven gear 19 is fixedly sleeved on the baffle ring 32 positioned on the left side, and the two lower connecting seats 9 and the three baffle rings 32 are arranged in a staggered manner; the portions of the side of the threaded rod 16 between the three stop rings 32 are threaded, and the remaining portions of the side of the threaded rod 16 are smooth.
In the specific implementation process, the two upper connecting seats 8 and the two lower connecting seats 9 are hinged to the end parts of the shearing arms of the shearing fork type lifting frame 7 through rotating shafts.
Claims (7)
1. A mobile protective device for bridge engineering construction comprises a bridge pier; the method is characterized in that: the device also comprises a base (1) which is horizontally placed, a protection platform which is positioned above the base (1) and a lifting device which is positioned between the protection platform and the base;
the lower surface of the base (1) is provided with a plurality of travelling wheels (2);
the protective platform comprises a supporting plate (3) horizontally arranged right above the base (1) and a protective frame (4) vertically arranged on the edge of the supporting plate (3), the bridge pier is arranged in front of the protective frame (4), the left side and the right side of the protective frame (4) are vertically provided with connecting plates (5) placed along the front-back direction, the front end parts of the two connecting plates (5) are respectively provided with two electric push rods (6) which are positioned in front of the protective frame (4) and symmetrically placed along the left-right direction, and the push rods of the two electric push rods (6) face the bridge pier;
the lifting device comprises a scissor type lifting frame (7); the upper ends of two scissor arms of the scissor type lifting frame (7) are respectively hinged with two upper connecting seats (8), and the lower ends are respectively hinged with two lower connecting seats (9) with assembling screw holes;
a sliding chute (10) is formed in the middle of the lower surface of the supporting plate (3), a sliding rod (11) is arranged between the left side wall and the right side wall of the sliding chute (10), two sliding blocks (12) capable of sliding left and right are sleeved on the sliding rod (11), and the two upper connecting seats (8) are respectively fixed to the lower surfaces of the two sliding blocks (12); the left end and the right end of the lower surface of the supporting plate (3) are respectively provided with a supporting block (13), and a telescopic rod (14) arranged along the left-right direction is respectively arranged between the upper connecting seat (8) positioned on the left side and the supporting block (13) positioned on the left side and between the upper connecting seat (8) positioned on the right side and the supporting block (13) positioned on the right side;
the upper surface of the base (1) is provided with two fixed blocks (15) which are distributed left and right, a rotatable threaded rod (16) is arranged between the two fixed blocks (15), the thread directions of the left part and the right part of the side surface of the threaded rod (16) are opposite, and the two lower connecting seats (9) are respectively in threaded connection with the left part and the right part of the side surface of the threaded rod (16); the rear of the fixed block (15) positioned on the left side is provided with a motor (17) with an output shaft facing to the right, the right end part of the output shaft of the motor (17) is fixedly provided with a driving gear (18), and the left end part of the threaded rod (16) is fixedly provided with a driven gear (19) meshed with the driving gear (18).
2. The mobile protective device for bridge engineering construction according to claim 1, wherein: the outer end part of the push rod of each electric push rod (6) is provided with a roller (20) which rolls on the side wall of the pier along the front-back direction.
3. The mobile protective device for bridge engineering construction according to claim 1, wherein: the protective frame (4) is of a rectangular structure; a protection plate (21) is arranged right above the protection frame (4), and the protection frame (4) is connected with the protection plate (21) through a plurality of support rods (22) arranged on the upper surfaces of the left frame side and the right frame side of the protection frame (4); each connecting plate (5) is connected with the protective frame (4) through two connecting rods (23).
4. The mobile protective device for bridge engineering construction according to claim 1, wherein: each telescopic link (14) is a telescopic sleeve, the left end part and the right end part of each telescopic link (14) are fixedly sleeved with a snap ring (24), and the outer side of each telescopic link is sleeved with a return spring (25) located between the two snap rings (24).
5. The mobile protective device for bridge engineering construction according to claim 1, wherein: the left side and the right side of the base (1) are both horizontally provided with a fixed lug plate (26), and each fixed lug plate (26) is in threaded connection with a positioning pin (27) which penetrates up and down; the number of the travelling wheels (2) is four; the four walking wheels (2) are respectively arranged at four corners of the lower surface of the base (1).
6. The mobile protective device for bridge engineering construction according to claim 1, wherein: a supporting plate (28) with a guide ball groove is horizontally arranged on the upper surface of the base (1), and the guide ball groove is arranged along the left-right direction; each lower connecting seat (9) is provided with a ball (30) through an arc-shaped connecting block (29), and the two balls (30) are assembled in the guide ball groove of the supporting plate (28) in a rolling manner.
7. The mobile protective device for bridge engineering construction according to claim 1, wherein: two fixed blocks (15) are respectively fixed with a sleeve (31), and two ends of the threaded rod (16) are respectively rotatably arranged in the two sleeves (31); three baffle rings (32) which are distributed at equal intervals are arranged on the side surface of the threaded rod (16) in an extending mode, the driven gear (19) is fixedly sleeved on the baffle ring (32) on the left side, and the two lower connecting seats (9) and the three baffle rings (32) are arranged in a staggered mode; the parts between the three baffle rings (32) on the side surface of the threaded rod (16) are threaded surfaces, and the rest parts on the side surface of the threaded rod (16) are smooth surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010178467.0A CN111321670A (en) | 2020-03-14 | 2020-03-14 | Movable protective device for bridge engineering construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010178467.0A CN111321670A (en) | 2020-03-14 | 2020-03-14 | Movable protective device for bridge engineering construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111321670A true CN111321670A (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010178467.0A Pending CN111321670A (en) | 2020-03-14 | 2020-03-14 | Movable protective device for bridge engineering construction |
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| Country | Link |
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| CN (1) | CN111321670A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227211A (en) * | 2020-09-30 | 2021-01-15 | 焦作大学 | Lifting type supporting device for bridge construction |
| CN113006446A (en) * | 2021-03-19 | 2021-06-22 | 黄河水利职业技术学院 | Multifunctional construction platform |
| CN113183145A (en) * | 2021-05-17 | 2021-07-30 | 和县隆盛精密机械有限公司 | Positioning clamping sensing device for visual machining and implementation method thereof |
| CN113513146A (en) * | 2021-03-15 | 2021-10-19 | 中国建筑第二工程局有限公司 | Portable intelligent building construction bearing platform |
| CN114314458A (en) * | 2021-12-31 | 2022-04-12 | 山东圣匠机械制造有限公司 | Rail type lifting operation platform |
| CN114809560A (en) * | 2022-05-17 | 2022-07-29 | 叶昌连 | Interior decoration platform convenient to adjust |
| CN114837391A (en) * | 2022-04-14 | 2022-08-02 | 陈建稳 | Peripheral construction supporting table of safety protection's building |
| CN115045488A (en) * | 2022-07-01 | 2022-09-13 | 张海滨 | Equipment is set up with steelframe to basic station construction for communication engineering |
| CN117988207A (en) * | 2024-04-03 | 2024-05-07 | 山西省交通规划勘察设计院有限公司 | Temporary expansion device for bridge |
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| CN110820557A (en) * | 2019-12-12 | 2020-02-21 | 中国铁建大桥工程局集团有限公司 | Steel truss arch bridge maintenance car |
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| EP2366655A1 (en) * | 2010-03-15 | 2011-09-21 | René Altena | Aerial work platform |
| CN206219165U (en) * | 2016-11-10 | 2017-06-06 | 靳昕春 | Power construction job platform |
| CN208578306U (en) * | 2018-05-23 | 2019-03-05 | 长春市城建维护股份有限公司 | A kind of constructing tunnel scaffold |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227211A (en) * | 2020-09-30 | 2021-01-15 | 焦作大学 | Lifting type supporting device for bridge construction |
| CN113513146A (en) * | 2021-03-15 | 2021-10-19 | 中国建筑第二工程局有限公司 | Portable intelligent building construction bearing platform |
| CN113513146B (en) * | 2021-03-15 | 2022-07-01 | 中国建筑第二工程局有限公司 | Portable intelligent building construction bearing platform |
| CN113006446B (en) * | 2021-03-19 | 2022-09-23 | 黄河水利职业技术学院 | Multifunctional construction platform |
| CN113006446A (en) * | 2021-03-19 | 2021-06-22 | 黄河水利职业技术学院 | Multifunctional construction platform |
| CN113183145A (en) * | 2021-05-17 | 2021-07-30 | 和县隆盛精密机械有限公司 | Positioning clamping sensing device for visual machining and implementation method thereof |
| CN114314458A (en) * | 2021-12-31 | 2022-04-12 | 山东圣匠机械制造有限公司 | Rail type lifting operation platform |
| CN114837391A (en) * | 2022-04-14 | 2022-08-02 | 陈建稳 | Peripheral construction supporting table of safety protection's building |
| CN114837391B (en) * | 2022-04-14 | 2023-11-14 | 南京交通工程有限公司 | Safety protection's peripheral construction brace table of building |
| CN114809560A (en) * | 2022-05-17 | 2022-07-29 | 叶昌连 | Interior decoration platform convenient to adjust |
| CN115045488A (en) * | 2022-07-01 | 2022-09-13 | 张海滨 | Equipment is set up with steelframe to basic station construction for communication engineering |
| CN117988207A (en) * | 2024-04-03 | 2024-05-07 | 山西省交通规划勘察设计院有限公司 | Temporary expansion device for bridge |
| CN117988207B (en) * | 2024-04-03 | 2024-06-04 | 山西省交通规划勘察设计院有限公司 | Temporary expansion device for bridge |
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Application publication date: 20200623 |