CN114411573A - Bridge rotation construction method - Google Patents
Bridge rotation construction method Download PDFInfo
- Publication number
- CN114411573A CN114411573A CN202210152619.9A CN202210152619A CN114411573A CN 114411573 A CN114411573 A CN 114411573A CN 202210152619 A CN202210152619 A CN 202210152619A CN 114411573 A CN114411573 A CN 114411573A
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- plate
- bridge
- workstation
- bridge plate
- placing
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 46
- 230000001681 protective effect Effects 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 7
- 230000003028 elevating effect Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
Abstract
The invention relates to the technical field of bridge construction, in particular to a bridge turning construction method, which aims at solving the problem that the longitudinal position of a bridge plate cannot be adjusted during bridge turning construction in the prior art, and the invention provides a scheme which comprises S1, after the bridge plate is poured and reaches the design strength, the bridge plate is hoisted on a placing plate through hoisting equipment, S2, a lifting mechanism drives the placing plate to move longitudinally, the bridge plate can move longitudinally, when the height of the bridge plate is higher than that of the bridge plate, the lifting mechanism stops moving, the invention can not only adjust the longitudinal position of the bridge plate, but also drive a measuring plate to rotate when the bridge plate turns, at the moment, under the action of the measuring plate, the scale value outside a ring plate can be observed, so that the rotating angle of the bridge plate can be accurately controlled, and the accuracy of the bridge plate during installation is improved, thereby reducing errors.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bridge rotation construction method.
Background
The bridge is a building constructed for a road to cross natural or artificial barriers, is erected on rivers, lakes and seas, and enables vehicles, pedestrians and the like to smoothly pass through, and generally consists of an upper structure, a lower structure and an auxiliary structure, wherein the upper structure mainly refers to a bridge span structure and a support system, the lower structure comprises a bridge abutment, a bridge pier and a foundation, and the auxiliary structure refers to a bridge head butt plate, a conical protection slope, a revetment, a diversion project and the like.
When the existing bridge is rotated for construction, the bridge plate can only be subjected to plane rotation adjustment, the longitudinal position of the bridge plate cannot be adjusted, certain defects can exist in the using process, so that the construction progress can be influenced, and the rotating angle of the bridge plate cannot be accurately controlled when the bridge plate is rotated, so that the accuracy of the installation of the bridge plate is reduced.
Therefore, it is necessary to provide a bridge swivel construction method to solve the above problems.
Disclosure of Invention
The bridge turning construction method provided by the invention solves the problem that the longitudinal position of a bridge plate cannot be adjusted during bridge turning construction in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a bridge swivel construction method comprises the following steps:
s1, after the bridge plate is poured and reaches the design strength, hoisting the bridge plate on the placing plate through hoisting equipment;
s2, driving the placing plate to move longitudinally through the lifting mechanism, enabling the bridge plate to move longitudinally, and stopping the movement of the lifting mechanism when the height of the bridge plate is higher than that of the bridge surface;
s3, turning the bridge hung on the placing plate, driving the placing plate to rotate through the rotating mechanism, enabling the bridge plate to rotate, and stopping rotating the rotating mechanism after the bridge plate rotates to the designed position;
s4, the bridge body is driven to slowly retract through the lifting mechanism, and when the bridge body descends to a preset position, the bridge plate and the top of the bridge body are located on the same horizontal plane, so that the bridge plate can be conveniently installed, and the swivel construction engineering is completed.
A construction device for a bridge swivel comprises a bottom plate, wherein two sleeve plates are arranged at the top of the bottom plate, cavities are formed in the two sleeve plates, limiting plates are arranged in the two cavities, the limiting plates are attached to the inner walls of the cavities, supporting plates are mounted at the tops of the two limiting plates, the tops of the two supporting plates respectively penetrate through the two cavities and extend to the outsides of the two cavities, and the tops of the two supporting plates are jointly provided with a workbench, both sides of the workbench are provided with fixing mechanisms for fixing the limiting plates, the top of the workbench is provided with a placing plate through a supporting mechanism, one side of the two sleeve plates close to each other is provided with a lifting mechanism for driving the workbench to lift, the rotary mechanism that the board was placed in the drive and is carried out the rotation is installed to the bottom of workstation, a plurality of stock are installed to the bottom of base.
Preferably, fixed establishment is including installing the mounting panel on one side of the workstation and seting up in lagging one side and with the bar mouth of cavity intercommunication, the mounting panel is close to one side of lagging and installs the sleeve, the spring is installed to telescopic one side inner wall, the kelly is installed to the one end of spring, and the one end of kelly is the triangle-shaped structure, the one end of kelly runs through bar mouth and limiting plate and extends to one side of limiting plate, one side inner wall that the bar mouth was kept away from to the cavity has seted up a plurality of and kelly matched with latch.
Preferably, the supporting mechanism comprises a plurality of connecting rods arranged at the bottom of the placing plate and an annular groove formed in the top of the workbench, the bottom of each connecting rod is provided with a plurality of balls, and the balls are connected in the annular groove in a sliding mode.
Preferably, elevating system is including installing two threaded rods that are close to one side each other at two lagging and two thread bushings of threaded connection in two threaded rod outsides, two the top of thread bushing all articulates there is the carriage release lever, two the top of carriage release lever all articulates with the bottom of workstation, first rotating electrical machines is installed at the top of bottom plate, first bevel gear is installed to first rotating electrical machines's output, two the second bevel gear with first bevel gear meshing is all installed to the one end that the threaded rod is close to each other.
Preferably, rotary mechanism is including installing the protective housing in the workstation bottom and installing the second rotating electrical machines at protective housing bottom inner wall, the reduction gear is installed to the output of second rotating electrical machines, the column spinner is installed to the output of reduction gear, the one end of column spinner run through protective housing and workstation and with place the bottom rigid coupling of board.
Preferably, the top of workstation is installed the annular slab, supporting mechanism is located the inside of annular slab, the outside of annular slab is provided with the scale, place the bottom of board and install the measurement board, the one side of measuring the board is laminated with one side of annular slab.
The invention has the technical effects and advantages that:
1. the lifting mechanism can drive the workbench to move longitudinally, and then can drive the placing plate to move longitudinally, so that the height of the bridge plate can be adjusted, when the workbench stops moving, the clamping rod can be clamped in one of the clamping teeth under the action of elastic force of the spring, the limiting plate can be fixed, the stability of the workbench when the workbench is lifted is improved, and more convenience is brought to people to use.
2. The rotating mechanism can drive the placing plate to rotate, the speed of the second rotating motor for rotating can be reduced through the speed reducer, the rotating plate can be rotated more stably, the measuring plate can be driven to rotate when the placing plate rotates, the scale value outside the annular plate can be observed under the action of the measuring plate, the rotating angle of the bridge plate is accurately controlled, the accuracy of the bridge plate during installation is improved, and errors are reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic front structural view of the present invention.
Fig. 3 is a partial structural schematic diagram of the present invention.
Fig. 4 is an enlarged schematic view of the structure at a in fig. 1 according to the present invention.
Fig. 5 is an enlarged schematic view of the structure at B in fig. 1 according to the present invention.
Fig. 6 is an enlarged schematic view of the structure of fig. 3 at C according to the present invention.
In the figure: 1. a base plate; 2. sheathing; 3. a work table; 4. placing the plate; 5. a protective box; 6. a second rotating electrical machine; 7. a speed reducer; 8. a spin column; 9. a threaded rod; 10. a threaded sleeve; 11. a travel bar; 12. an anchor rod; 13. an annular plate; 14. a support plate; 15. mounting a plate; 16. measuring a plate; 17. a strip-shaped opening; 18. a sleeve; 19. a spring; 20. a clamping rod; 21. a limiting plate; 22. clamping teeth; 23. a first rotating electrical machine; 24. a first bevel gear; 25. a second bevel gear; 26. a connecting rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a bridge swivel construction method as shown in figures 1-6, which comprises the following steps:
s1, after the bridge plate is poured and reaches the design strength, hoisting the bridge plate on the placing plate through hoisting equipment;
s2, driving the placing plate to move longitudinally through the lifting mechanism, enabling the bridge plate to move longitudinally, and stopping the movement of the lifting mechanism when the height of the bridge plate is higher than that of the bridge surface;
s3, turning the bridge hung on the placing plate, driving the placing plate to rotate through the rotating mechanism, enabling the bridge plate to rotate, and stopping rotating the rotating mechanism after the bridge plate rotates to the designed position;
s4, the bridge body is driven to slowly retract through the lifting mechanism, and when the bridge body descends to a preset position, the bridge plate and the top of the bridge body are located on the same horizontal plane, so that the bridge plate can be conveniently installed, and the swivel construction engineering is completed.
A construction device for a bridge swivel comprises a bottom plate 1, two sleeve plates 2 are arranged at the top of the bottom plate 1, cavities are formed in the two sleeve plates 2, limiting plates 21 are arranged in the two cavities, the limit plates 21 are attached to the inner walls of the cavities, the top parts of the two limit plates 21 are respectively provided with the support plates 14, the top parts of the two support plates 14 respectively penetrate through the two cavities and extend to the outside of the two cavities, and the top of two backup pads 14 installs workstation 3 jointly, and fixed establishment is all installed to the both sides of workstation 3 for being used for fixing limiting plate 21, and place board 4 is installed through supporting mechanism in the top of workstation 3, and the elevating system that drives workstation 3 and go up and down is installed to the one side that two lagging 2 are close to each other, and the rotary mechanism that the board 4 was placed in the drive rotation is installed to the bottom of workstation 3, and a plurality of stock 12 are installed to the bottom of base 1.
The fixing mechanism comprises a mounting plate 15 arranged on one side of the workbench 3 and a strip-shaped opening 17 arranged on one side of the sleeve plate 2 and communicated with the cavity, a sleeve 18 is arranged on one side of the mounting plate 15 close to the sleeve plate 2, a spring 19 is arranged on the inner wall of one side of the sleeve 18, a clamping rod 20 is arranged at one end of the spring 19, one end of the clamping rod 20 is of a triangular structure, one end of the clamping rod 20 penetrates through the strip-shaped opening 17 and the limiting plate 21 and extends to one side of the limiting plate 21, a plurality of clamping teeth 22 matched with the clamping rod 20 are arranged on the inner wall of one side of the cavity far away from the strip-shaped opening 17, when the workbench 3 does longitudinal motion, the mounting plate 15 and the supporting plate 14 are driven to do longitudinal motion, when the mounting plate 15 and the supporting plate 14 move, the clamping rod 20 and the limiting plate 21 move, when the first rotating motor 23 stops rotating, under the action of the elastic force of the spring 19, the clamping rod 20 is clamped in one of the clamping teeth 22, this can fix the limiting plate 21, thereby further improving the stability of the table 3.
The supporting mechanism comprises a plurality of connecting rods 26 arranged at the bottom of the placing plate 4 and an annular groove formed in the top of the workbench 3, balls are arranged at the bottoms of the connecting rods 26, the balls are connected in the annular groove in a sliding mode, supporting force of the placing plate 4 is improved through the supporting mechanism with the balls, and accordingly pressure born by the rotary column 8 is reduced.
The lifting mechanism comprises two threaded rods 9 and two threaded sleeves 10, wherein the two threaded rods 9 and the two threaded sleeves 10 are mounted on one side of each sleeve plate 2 and are close to each other, the two threaded sleeves 10 are connected to the two outer portions of the two threaded rods 9 in a threaded mode, moving rods 11 are hinged to the tops of the two threaded sleeves 10, the tops of the two moving rods 11 are hinged to the bottom of the workbench 3, a first rotating motor 23 is mounted at the top of the bottom plate 1, a first bevel gear 24 is mounted at the output end of the first rotating motor 23, and a second bevel gear 25 meshed with the first bevel gear 24 is mounted at one end, close to each other, of the two threaded rods 9.
Rotary mechanism is including installing protective housing 5 in workstation 3 bottom and installing the second rotating electrical machines 6 at protective housing 5 bottom inner wall, reduction gear 7 is installed to the output of second rotating electrical machines 6, column spinner 8 is installed to the output of reduction gear 7, column spinner 8's one end is run through protective housing 5 and workstation 3, and with the bottom rigid coupling of placing board 4, reduction gear 7 through being equipped with can reduce second rotating electrical machines 6 and carry out rotatory speed, make its more steady rotation that turns.
The working principle of the invention is as follows: in a specific implementation process, after the bridge slab is poured and reaches a designed strength, the bridge slab is hoisted on the placing plate 4 through hoisting equipment, at the moment, the first rotating motor 23 drives the first bevel gear 24 to rotate in a forward direction, the two threaded rods 9 rotate through the meshing of the first bevel gear 24 and the two second bevel gears 25, when the two threaded rods 9 rotate, the two threaded sleeves 10 are driven to move towards one side close to each other, so that the two moving rods 11 move, when the two moving rods 11 move, the workbench 3 is driven to move upwards, when the workbench 3 moves upwards, the placing plate 4 is driven to move upwards, so that a bridge body hoisted on the placing plate 4 moves upwards, the placing plate is driven to move longitudinally through the lifting mechanism, and the bridge slab moves longitudinally, when the height of the bridge slab is higher than that of the bridge slab, the lifting mechanism stops moving, at the moment, the first rotating motor 23 stops rotating, when the workbench 3 does longitudinal movement, the mounting plate 15 and the support plate 14 are driven to do longitudinal movement, when the mounting plate 15 and the support plate 14 move, the clamping rod 20 and the limiting plate 21 move, when the first rotating motor 23 stops rotating, under the action of elastic force of the spring 19, the clamping rod 20 is clamped in one of the clamping teeth 22, so that the limiting plate 21 can be fixed, the stability of the workbench 3 is further improved, then the bridge plate hung on the placing plate 4 is rotated, at the moment, the second rotating motor 6 is started, when the second rotating motor 6 rotates, the reducer 7 is driven to move, so that the rotating column 8 rotates, the placing plate 4 is driven to rotate through the rotating mechanism, and then the bridge plate rotates, when the bridge plate rotates to the designed position, the rotation mechanism stops rotating, the second rotating motor 6 stops working, the speed of the second rotating motor 6 can be reduced through the reducer 7, the second rotating motor 6 can rotate more stably, the measurement plate 16 can be driven to rotate in the process of rotating the placing plate 4, the scale value outside the annular plate 13 can be observed under the action of the measurement plate 16, the rotating angle of the bridge plate can be accurately controlled, the accuracy of the bridge plate during installation is improved, errors are reduced, when the rotation mechanism stops working, the first rotating motor 23 can rotate reversely, at the moment, the two thread sleeves 10 can move to the side away from each other, the two moving rods 11 can move, the workbench 3 can be driven to move downwards, and the placing plate 4 can move downwards, the bridge body is driven to slowly retract through the lifting mechanism, and when the bridge body descends to a preset position, the bridge plate and the top of the bridge body are located on the same horizontal plane, so that the bridge plate can be conveniently installed, and the swivel construction engineering is completed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A bridge rotation construction method is characterized by comprising the following steps:
s1, after the bridge plate is poured and reaches the design strength, hoisting the bridge plate on the placing plate through hoisting equipment;
s2, driving the placing plate to move longitudinally through the lifting mechanism, enabling the bridge plate to move longitudinally, and stopping the movement of the lifting mechanism when the height of the bridge plate is higher than that of the bridge surface;
s3, turning the bridge hung on the placing plate, driving the placing plate to rotate through the rotating mechanism, enabling the bridge plate to rotate, and stopping rotating the rotating mechanism after the bridge plate rotates to the designed position;
s4, the bridge body is driven to slowly retract through the lifting mechanism, and when the bridge body descends to a preset position, the bridge plate and the top of the bridge body are located on the same horizontal plane, so that the bridge plate can be conveniently installed, and the swivel construction engineering is completed.
2. The construction device suitable for the bridge swivel construction method according to claim 1, comprising a bottom plate (1), wherein two sleeve plates (2) are installed at the top of the bottom plate (1), cavities are formed in the two sleeve plates (2), limiting plates (21) are installed in the two cavities, the limiting plates (21) are attached to the inner walls of the cavities, supporting plates (14) are installed at the tops of the two limiting plates (21), the tops of the two supporting plates (14) respectively penetrate through the two cavities and extend to the outer portions of the two cavities, a workbench (3) is installed at the tops of the two supporting plates (14) together, fixing mechanisms are installed on two sides of the workbench (3) to fix the limiting plates (21), and a placing plate (4) is installed at the top of the workbench (3) through the supporting mechanisms, two elevating system that drive workstation (3) goes up and down is installed to the one side that lagging (2) are close to each other, the drive is installed to the bottom of workstation (3) and is placed board (4) and carry out rotatory rotary mechanism, a plurality of stock (12) are installed to the bottom of base (1).
3. The bridge swivel construction device according to claim 2, wherein: fixed establishment is including installing mounting panel (15) in workstation (3) one side and seting up bar mouth (17) in lagging (2) one side and with the cavity intercommunication, mounting panel (15) are close to one side of lagging (2) and install sleeve (18), spring (19) are installed to one side inner wall of sleeve (18), kelly (20) are installed to the one end of spring (19), and the one end of kelly (20) is the triangle-shaped structure, the one end of kelly (20) runs through bar mouth (17) and limiting plate (21) and extend to one side of limiting plate (21), one side inner wall that bar mouth (17) were kept away from to the cavity is seted up a plurality of and kelly (20) matched with latch (22).
4. The bridge swivel construction device according to claim 2, wherein: the supporting mechanism comprises a plurality of connecting rods (26) arranged at the bottom of the placing plate (4) and an annular groove formed in the top of the workbench (3), and balls are arranged at the bottoms of the connecting rods (26) and are connected in the annular groove in a sliding mode.
5. The bridge swivel construction device according to claim 2, wherein: elevating system is including installing two threaded rods (9) and two threaded sleeves (10) of threaded connection outside two threaded rods (9) that are close to one side each other at two lagging (2), two the top of threaded sleeve (10) all articulates there is carriage release lever (11), two the top of carriage release lever (11) all articulates with the bottom of workstation (3), first rotating electrical machines (23) are installed at the top of bottom plate (1), first bevel gear (24), two are installed to the output of first rotating electrical machines (23) the one end that threaded rod (9) are close to each other all installs second bevel gear (25) with first bevel gear (24) meshing.
6. The bridge swivel construction device according to claim 2, wherein: rotary mechanism is including installing protective housing (5) in workstation (3) bottom and installing second rotating electrical machines (6) at protective housing (5) bottom inner wall, reduction gear (7) are installed to the output of second rotating electrical machines (6), column spinner (8) are installed to the output of reduction gear (7), the one end of column spinner (8) run through protective housing (5) and workstation (3) and with the bottom rigid coupling of placing board (4).
7. The bridge swivel construction device according to claim 2, wherein: annular plate (13) are installed at the top of workstation (3), supporting mechanism is located the inside of annular plate (13), the outside of annular plate (13) is provided with the scale, place the bottom of board (4) and install and measure board (16), the one side laminating of measuring board (16) and one side of annular plate (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152619.9A CN114411573A (en) | 2022-02-18 | 2022-02-18 | Bridge rotation construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152619.9A CN114411573A (en) | 2022-02-18 | 2022-02-18 | Bridge rotation construction method |
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| Publication Number | Publication Date |
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| CN114411573A true CN114411573A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210152619.9A Pending CN114411573A (en) | 2022-02-18 | 2022-02-18 | Bridge rotation construction method |
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| CN (1) | CN114411573A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115096707A (en) * | 2022-08-26 | 2022-09-23 | 中铁北京工程局集团(天津)工程有限公司 | Building material compressive strength detection device for bridge engineering |
| CN115404779A (en) * | 2022-07-25 | 2022-11-29 | 中铁十一局集团有限公司 | Prefabricated small box girder type hidden cover beam supporting system and construction method thereof |
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| KR20070016378A (en) * | 2005-08-03 | 2007-02-08 | 명보산공 주식회사 | Method of constructing temporary bridge and Rotation Apparatus therefor |
| CN110092317A (en) * | 2019-05-17 | 2019-08-06 | 侯红杰 | A kind of quick-lift attachreactor for road and bridge construction |
| CN111893901A (en) * | 2020-08-07 | 2020-11-06 | 华东交通大学 | Bridge rotation construction device |
| CN112030778A (en) * | 2020-08-21 | 2020-12-04 | 台州学院 | Bridge rotating device capable of rotating stably and construction method thereof |
| CN212340282U (en) * | 2020-08-08 | 2021-01-12 | 北京首发公路养护工程有限公司 | Bridge real-time monitoring equipment |
-
2022
- 2022-02-18 CN CN202210152619.9A patent/CN114411573A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070016378A (en) * | 2005-08-03 | 2007-02-08 | 명보산공 주식회사 | Method of constructing temporary bridge and Rotation Apparatus therefor |
| CN110092317A (en) * | 2019-05-17 | 2019-08-06 | 侯红杰 | A kind of quick-lift attachreactor for road and bridge construction |
| CN111893901A (en) * | 2020-08-07 | 2020-11-06 | 华东交通大学 | Bridge rotation construction device |
| CN212340282U (en) * | 2020-08-08 | 2021-01-12 | 北京首发公路养护工程有限公司 | Bridge real-time monitoring equipment |
| CN112030778A (en) * | 2020-08-21 | 2020-12-04 | 台州学院 | Bridge rotating device capable of rotating stably and construction method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404779A (en) * | 2022-07-25 | 2022-11-29 | 中铁十一局集团有限公司 | Prefabricated small box girder type hidden cover beam supporting system and construction method thereof |
| CN115096707A (en) * | 2022-08-26 | 2022-09-23 | 中铁北京工程局集团(天津)工程有限公司 | Building material compressive strength detection device for bridge engineering |
| CN115096707B (en) * | 2022-08-26 | 2022-11-18 | 中铁北京工程局集团(天津)工程有限公司 | Building material compressive strength detection device for bridge engineering |
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