CN109555024B - Modularized self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering - Google Patents
Modularized self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering Download PDFInfo
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- CN109555024B CN109555024B CN201811579209.2A CN201811579209A CN109555024B CN 109555024 B CN109555024 B CN 109555024B CN 201811579209 A CN201811579209 A CN 201811579209A CN 109555024 B CN109555024 B CN 109555024B
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 36
- 239000010959 steel Substances 0.000 title claims abstract description 36
- 238000009434 installation Methods 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 abstract description 13
- 238000000576 coating method Methods 0.000 abstract description 13
- 238000003860 storage Methods 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000005422 blasting Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/343—Structures characterised by movable, separable, or collapsible parts, e.g. for transport
- E04B1/34315—Structures characterised by movable, separable, or collapsible parts, e.g. for transport characterised by separable parts
-
- 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
- E04H1/00—Buildings or groups of buildings for dwelling or office purposes; General layout, e.g. modular co-ordination or staggered storeys
- E04H1/12—Small buildings or other erections for limited occupation, erected in the open air or arranged in buildings, e.g. kiosks, waiting shelters for bus stops or for filling stations, roofs for railway platforms, watchmen's huts or dressing cubicles
- E04H1/1205—Small buildings erected in the open air
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
According to the modularized self-propelled weather shed width adjusting mechanism for all-weather construction of the steel bridge deck engineering, the main body cross beam and the supporting upright posts are hinged with the short cross beams with different lengths through the shaft sleeves and the lug plates, so that the weather shed can be supported to adapt to bridge decks with different widths, a relative sealing device with a certain space is formed above the bridge decks, and the influence of natural weather on the construction of the coating engineering is reduced; the main body cross beam is hinged with the short cross beam through the cooperation of the lug plate and the shaft sleeve between the cross beam fixing sections at the top ends of the short cross beam and the supporting upright post, the width of the wind and rain shed is adjusted according to the widths of different roads, the supporting strength is high, the stability is good, the installation and the disassembly are convenient and quick, the equipment cost investment is reduced, the time and the labor are saved, the occupied space is small, and the installation, the transportation, the storage and the management are convenient.
Description
Technical Field
The invention relates to a modularized self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge surface engineering in bridge construction technology.
Background
In the modern bridge construction technology, a bridge main body is generally composed of steel structure box girders, and in the production and manufacturing process of the steel box girders, rust and other diseases are inevitably generated on the surface of the structure, so that the bonding strength of paving a bridge deck surface layer is affected; therefore, after the steel box girder bridge body is hoisted and closed, the surface of the box girder must be subjected to shot blasting, adhesive spraying and other coating construction; the coating construction process has strict requirements on climate and environment, and cannot perform bridge deck shot blasting and adhesive coating engineering construction under the climatic conditions such as frost, rain and snow, excessive humidity and the like, so that the construction period of project engineering is affected; the bridge floor top sets up the weather shed, because the bridge floor of different road construction projects has multiple width specifications, is equipped with corresponding weather shed respectively according to different bridge floor widths, and equipment cost is put into highly, wastes time and energy much, and occupation space is big, and installation, transportation, storage, management operation are difficult.
Disclosure of Invention
The invention aims to solve the technical problem of providing the modularized self-propelled weather shed width adjusting mechanism which can adjust the width of the weather shed according to different road widths, has high supporting strength, good stability and convenient installation and disassembly and is used for all-weather construction of steel bridge deck engineering.
The invention relates to a modularized self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering, which comprises a support frame formed by a beam and a support column, wherein the bottom of the outer end of the beam is fixedly connected to the top end of the support column, and is characterized in that: the cross beam comprises a main body cross beam extending from the vertical central line of the weather shed to the edge of the steel bridge deck and a cross beam fixing section fixedly connected to the top end of the supporting upright post, a plurality of short cross beams are arranged between the main body cross beam and the cross beam fixing section, a through hole is formed in the middle of one end of each short cross beam, a shaft sleeve is fixedly arranged in the through hole, and a rotatable pin shaft is arranged in the shaft sleeve; a pair of lug plates capable of being clamped on two sides of the shaft sleeve at the end part of the adjacent short beam are symmetrically arranged on two sides of the middle part of the other end of each short beam, the root parts of the lug plates are fixedly connected to two side surfaces of the short beam, the top part of each lug plate extends out of the short beam along the length direction of the short beam and is provided with a shaft hole, and the lug plates are hinged at two ends of the pin shaft through the shaft holes; the end part of the main body beam, which is connected with the short beam, is also provided with a pair of lug plates, and the end part of the beam fixing section, which is connected with the short beam, is also fixedly provided with a shaft sleeve through a through hole;
the length of the shaft sleeve is larger than the thickness of the end part of the short beam, so that two ends of the shaft sleeve extend out of two sides of the short beam, the distance between a pair of ear plates is consistent with the length of the shaft sleeve, one end of the pin shaft is provided with a limiting end plate, and the other end of the pin shaft is in limiting installation and locking through a limiting retainer ring, a gasket and a nut in sequence;
an inclined support beam is fixedly connected between the support upright post and the main body cross beam;
the two ends of the inclined support beam are fixedly connected to the support upright post and the main body cross beam through bolt connecting structures respectively;
the two end surfaces of the inclined support beam are inclined surfaces, so that one end of the inclined support beam is clung to the side surface of the support upright post along the straight direction, and the other end of the inclined support beam is clung to the bottom surface of the main body cross beam along the horizontal direction;
the plurality of short beams comprise a first short beam which can adapt to a bridge deck with the width of 15000mm and a second short beam which can adapt to a bridge deck with the width of 18750mm in a matched manner with the first short beam; the main body cross beam is connected with the cross beam fixing section through a first short cross beam, or the main body cross beam is connected with the cross beam fixing section through the first short cross beam and a second short cross beam in sequence, or the main body cross beam is directly connected with the cross beam fixing section;
the main body cross beam, the short cross beam and the cross beam fixing section are all I-steel.
The modularized self-propelled weather shed width adjusting mechanism for all-weather construction of the steel bridge deck engineering is characterized in that a plurality of short cross beams with different lengths are arranged between the main body cross beams and the supporting upright posts, so that the weather shed can be supported to adapt to bridge decks with different widths, a relative sealing device with a certain space is formed above the bridge decks, and the influence of natural weather on the construction of the coating engineering is reduced; the main body cross beam is hinged with the short cross beam through the cooperation of the lug plate and the shaft sleeve between the cross beam fixing sections at the top ends of the short cross beam and the supporting upright post, the width of the wind and rain shed is adjusted according to the widths of different roads, the supporting strength is high, the stability is good, the installation and the disassembly are convenient and quick, the equipment cost investment is reduced, the time and the labor are saved, the occupied space is small, and the installation, the transportation, the storage and the management are convenient.
Drawings
FIG. 1 is a schematic plan view of a modular self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel deck projects, applied to a 18750mm wide deck, according to an embodiment of the invention;
FIG. 2 is an enlarged schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is an enlarged schematic view of two ends of a short beam of a modular self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering according to an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of FIG. 3;
FIG. 5 is a schematic plan view of a modular self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering, applied to a 15000 width bridge deck, according to the second embodiment of the invention;
fig. 6 is a schematic plan view of the modular self-propelled wind and rain shed width adjusting mechanism applied to a 13000 width bridge deck for all-weather construction of steel bridge deck engineering according to the embodiment of the invention.
Description of the embodiments
As shown in the figure, a modularization self-propelled weather shed width adjustment mechanism for steel bridge deck engineering all-weather construction, include the support frame that comprises crossbeam, support post 5, crossbeam outer end bottom fixed connection is on support post 5 top, the crossbeam includes the main part crossbeam 1 that extends to steel bridge face edge by the vertical central line 100 of weather shed, and fixed connection is at the crossbeam fixed section 4 on support post top, be provided with many short crossbeams between main part crossbeam 1 and the crossbeam fixed section 4, through increase and decrease short crossbeam quantity, can support the weather shed and adapt to different width bridge decks, constitute the relative closing means who has certain space in the bridge floor top, reduce the influence of natural climate to the application engineering construction.
A through hole is formed in the middle of one end of each short beam, a shaft sleeve 11 is fixedly arranged in the through hole, and a rotatable pin shaft 10 is arranged in the shaft sleeve 11; a pair of lug plates 6 which can be clamped on two sides of the shaft sleeve at the end part of the adjacent short beam are symmetrically arranged on two sides of the middle part of the other end of each short beam, the root parts of the lug plates 6 are fixedly connected to two side surfaces of the short beam, the top part of each lug plate extends out of the short beam along the length direction of the short beam and is provided with a shaft hole, and the lug plates 6 are hinged at two ends of the pin shaft 10 through the shaft holes; the end part of the main body beam 1 connected with the short beam is also provided with a pair of lug plates 6, and the end part of the beam fixing section 4 connected with the short beam is also fixedly provided with a shaft sleeve 11 through a through hole; the short cross beam is hinged with the cross beam fixing section at the top end of the supporting upright post in a matched mode through the lug plates and the shaft sleeve, the width of the weather shed is adjusted according to different road widths, the supporting strength is high, and the stability is good.
The length of the shaft sleeve 11 is greater than the thickness of the end part of the short beam, so that the two ends of the shaft sleeve 11 extend out of the two sides of the short beam, the distance between the pair of ear plates 6 is consistent with the length of the shaft sleeve 11, one end of the pin shaft 10 is provided with a limiting end plate, the other end of the pin shaft is in turn subjected to limiting installation and locking through the limiting check ring 9, the gasket 8 and the nut 7, the connection is reliable, and the installation and the disassembly are convenient and quick.
And an inclined supporting beam 51 is fixedly connected between the supporting upright post 5 and the main body cross beam 1, so that the supporting rigidity of the supporting upright post and the cross beam is improved.
The two ends of the inclined support beam 51 are fixedly connected to the support upright post 5 and the main body cross beam 1 through bolt connection structures respectively, and the installation and connection operations are convenient.
The two end surfaces of the inclined support beam 51 are inclined surfaces, so that one end of the inclined support beam 51 is tightly attached to the side surface of the support upright 5 along the straight direction, and the other end of the inclined support beam is tightly attached to the bottom surface of the main body beam 1 along the horizontal direction, and the stability is good.
The plurality of short beams comprise a first short beam 2 which can adapt to a bridge deck with the width of 15000mm and a second short beam 3 which can adapt to a bridge deck with the width of 18750mm in a matched manner with the first short beam; the center distance between the shaft sleeve of the first short beam and the lug plate hole is 1000mm, and the center distance between the shaft sleeve of the second short beam and the lug plate hole is 1875mm.
The main body cross beam of the first embodiment is connected with the cross beam fixing section through the first short cross beam and the second short cross beam in sequence, and can be used for a bridge deck with the width of 18750 mm;
the main body beam of the second embodiment is connected with the beam fixing section through the first short beam, and can be used for a bridge deck with the width of 15000 mm;
the main body beam of the third embodiment is directly connected with the beam fixing section; can be used for bridge decks with the width of 13000 mm.
The main body beam 1, the first short beam, the second short beam and the beam fixing sections are all I-steel, and the shaft sleeve and the lug plate are arranged on the middle main body 12 of the I-steel.
The modularized self-propelled weather shed width adjusting mechanism for all-weather construction of the steel bridge deck engineering is characterized in that a plurality of short cross beams with different lengths are arranged between the main body cross beams and the supporting upright posts, so that the weather shed can be supported to adapt to bridge decks with different widths, a relative sealing device with a certain space is formed above the bridge decks, and the influence of natural weather on the construction of the coating engineering is reduced; the main body cross beam is hinged with the short cross beam through the cooperation of the lug plate and the shaft sleeve between the cross beam fixing sections at the top ends of the short cross beam and the supporting upright post, the width of the wind and rain shed is adjusted according to the widths of different roads, the supporting strength is high, the stability is good, the installation and the disassembly are convenient and quick, the equipment cost investment is reduced, the time and the labor are saved, the occupied space is small, and the installation, the transportation, the storage and the management are convenient.
The specific design idea is as follows:
the invention relates to a mechanism of auxiliary equipment for steel bridge deck shot blasting engineering and adhesive coating engineering construction, in particular to a mechanism which is used for ensuring weather construction of steel bridge deck shot blasting engineering and adhesive coating engineering and used for a weather shed, and the width of the weather shed can be adjusted according to bridge deck width series.
In modern bridge construction technology, the bridge main body mainly consists of steel structure box girders. In the production and manufacturing process of the steel box girder, the structural surface inevitably generates diseases such as rust and the like, and the bonding strength of paving the bridge deck surface layer is affected. Therefore, after the steel box girder bridge body is hoisted and closed, the surface of the box girder must be subjected to construction such as shot blasting, adhesive spraying, coating and the like. The shot blasting and coating construction process has strict requirements on weather and environment, and bridge deck engineering construction cannot be performed under weather conditions such as frost, rain and snow, too high humidity and the like. Thereby affecting the construction period of the project. The modularized self-propelled weather shed device with a certain relative closed space can reduce the influence of natural climate on the construction of coating engineering as much as possible. However, according to road construction needs, the bridge deck has a certain width series, if the wind and rain shed devices with different road widths are designed according to the width series of the bridge deck, time and labor are wasted, and construction cost and enterprise storage and transportation management difficulty are greatly increased.
The invention aims to solve the technical problem that the device for performing all-weather construction of shot blasting and coating engineering under different road width conditions can be met by a mechanism for adjusting the width of a self-propelled weather shed.
In order to achieve the above object, the present invention solves the following problems: according to bridge deck structure and width series, through adjusting self-propelled weather shed crossbeam structure for self-propelled weather shed can satisfy throwing ball and application construction needs under 13M, 15M and 18.75M road surface width condition.
In particular to a self-propelled wind-rain shed width adjusting mechanism which is safe and reliable in structure and convenient to assemble, disassemble and assemble.
The invention relates to a modularized self-propelled wind and rain shed width adjusting mechanism, which comprises:
as shown in the first, second and third drawings: the width adjusting mechanism of the modularized self-propelled weather shed mainly comprises a beam 1, a first short beam, a second short beam and a beam fixing structure.
When the main body cross beam, the first short cross beam and the second short cross beam are combined as shown in the first drawing, the self-propelled weather shed for the 18.75M-width road surface can be formed.
When the main body cross beam, the first short cross beam and the drawing five are combined, the self-propelled weather shed for the 15M wide road surface can be formed.
When the main body cross beam is adopted and combined as shown in a sixth drawing, the self-propelled weather shed for the 13M wide road surface can be formed.
The main body cross beam is connected with the first short cross beam, the first short cross beam is connected with the second short cross beam, the second short cross beam fixing section and the main body cross beam is connected with the cross beam fixing section through a hinge structure.
And 3 groups of inclined support fixing screw holes are formed in the corresponding positions of the cross beams, and the inclined support beams are fixed according to the width requirements of the self-propelled weather shed.
And the second drawing is a schematic diagram of a hinged structure of the cross beam and the short cross beam or the cross beam and the end cross beam. And the third drawing and the fourth drawing are schematic diagrams of the mechanism of the short cross beam. One end of the short beam is welded with a shaft sleeve, and an inner hole phi of the shaft sleeve is 40mm; the other end is welded with an ear plate, the ear plate is provided with a pin hole phi 40mm, the ear plate is connected with the pin hole on the end cross beam through a pin shaft, and the pin shaft is locked through a retainer ring, a locking washer and a nut after the ear plate is spliced.
The width adjusting mechanism has a simple and reliable structure and is convenient to assemble and disassemble. The wind and rain sheds with the required width can be formed by combining the bridge deck width series, and the requirements of steel bridge deck shot blasting engineering construction and adhesive coating engineering construction under all-weather conditions are met. And provides a guarantee for guaranteeing the bridge construction period.
Claims (7)
1. A modularization self-propelled weather shed width adjustment mechanism for construction of steel bridge deck engineering all-weather includes the support frame that comprises crossbeam, support column, crossbeam outer end bottom fixed connection at support column top, its characterized in that: the cross beam comprises a main body cross beam extending from the vertical central line of the weather shed to the edge of the steel bridge deck and a cross beam fixing section fixedly connected to the top end of the supporting upright post, a plurality of short cross beams are arranged between the main body cross beam and the cross beam fixing section, a through hole is formed in the middle of one end of each short cross beam, a shaft sleeve is fixedly arranged in the through hole, and a rotatable pin shaft is arranged in the shaft sleeve; a pair of lug plates capable of being clamped on two sides of the shaft sleeve at the end part of the adjacent short beam are symmetrically arranged on two sides of the middle part of the other end of each short beam, the root parts of the lug plates are fixedly connected to two side surfaces of the short beam, the top part of each lug plate extends out of the short beam along the length direction of the short beam and is provided with a shaft hole, and the lug plates are hinged at two ends of the pin shaft through the shaft holes; the end part of the main body beam, which is connected with the short beam, is also provided with a pair of lug plates, and the end part of the beam fixing section, which is connected with the short beam, is also fixedly provided with a shaft sleeve through a through hole.
2. The modular self-propelled windshed width adjusting mechanism for all-weather construction of steel deck engineering according to claim 1, wherein: the length of the shaft sleeve is greater than the thickness of the end part of the short beam, so that the two ends of the shaft sleeve extend out of the two sides of the short beam, the distance between the pair of ear plates is consistent with the length of the shaft sleeve, one end of the pin shaft is provided with a limiting end plate, and the other end of the pin shaft is in limiting installation and locking through a limiting check ring, a gasket and a nut in sequence.
3. The modular self-propelled windshed width adjusting mechanism for all-weather construction of steel deck engineering according to claim 1, wherein: and an inclined support beam is fixedly connected between the support upright post and the main body cross beam.
4. A modular self-propelled windshed width adjustment mechanism for all-weather construction of steel deck projects as claimed in claim 3, wherein: and two ends of the inclined support beam are fixedly connected with the support upright post and the main body cross beam through bolt connection structures respectively.
5. A modular self-propelled windshed width adjustment mechanism for all-weather construction of steel deck projects as claimed in claim 3, wherein: the two end faces of the inclined support beam are inclined planes, so that one end of the inclined support beam is clung to the side face of the support upright post along the vertical direction, and the other end of the inclined support beam is clung to the bottom face of the main body cross beam along the horizontal direction.
6. The modular self-propelled windshed width adjusting mechanism for all-weather construction of steel deck engineering according to claim 1, wherein: the plurality of short beams comprise a first short beam which can adapt to a bridge deck with the width of 15000mm and a second short beam which can adapt to a bridge deck with the width of 18750mm in a matched manner with the first short beam; the main body cross beam is connected with the cross beam fixing section through the first short cross beam, or the main body cross beam is connected with the cross beam fixing section through the first short cross beam and the second short cross beam in sequence, or the main body cross beam is directly connected with the cross beam fixing section.
7. The modular self-propelled windshed width adjusting mechanism for all-weather construction of steel deck engineering according to claim 1, wherein: the main body cross beam, the short cross beam and the cross beam fixing section are all I-steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579209.2A CN109555024B (en) | 2018-12-24 | 2018-12-24 | Modularized self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579209.2A CN109555024B (en) | 2018-12-24 | 2018-12-24 | Modularized self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering |
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| Publication Number | Publication Date |
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| CN109555024A CN109555024A (en) | 2019-04-02 |
| CN109555024B true CN109555024B (en) | 2024-02-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205369946U (en) * | 2015-12-31 | 2016-07-06 | 中铁十一局集团第六工程有限公司 | Self -propelled modularization subway station roofing steel structure installation support frame |
| CN207761199U (en) * | 2017-11-13 | 2018-08-24 | 深圳市盐田港万永联集装箱有限公司 | All-weather shed telescopic device |
| CN109025388A (en) * | 2018-08-14 | 2018-12-18 | 中铁十六局集团北京轨道交通工程建设有限公司 | A kind of removable expansion type can open the constructing device and construction method of awning |
| CN209989700U (en) * | 2018-12-24 | 2020-01-24 | 镇江蓝舶科技股份有限公司 | Modular self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100071141A1 (en) * | 2008-09-19 | 2010-03-25 | Randall Julian Reiner | Variable length beam |
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2018
- 2018-12-24 CN CN201811579209.2A patent/CN109555024B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205369946U (en) * | 2015-12-31 | 2016-07-06 | 中铁十一局集团第六工程有限公司 | Self -propelled modularization subway station roofing steel structure installation support frame |
| CN207761199U (en) * | 2017-11-13 | 2018-08-24 | 深圳市盐田港万永联集装箱有限公司 | All-weather shed telescopic device |
| CN109025388A (en) * | 2018-08-14 | 2018-12-18 | 中铁十六局集团北京轨道交通工程建设有限公司 | A kind of removable expansion type can open the constructing device and construction method of awning |
| CN209989700U (en) * | 2018-12-24 | 2020-01-24 | 镇江蓝舶科技股份有限公司 | Modular self-propelled wind and rain shed width adjusting mechanism for all-weather construction of steel bridge deck engineering |
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