CN107574746B - Connecting device for prefabricated bridge deck space steel pipe concrete truss composite beam and construction method - Google Patents
Connecting device for prefabricated bridge deck space steel pipe concrete truss composite beam and construction method Download PDFInfo
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- CN107574746B CN107574746B CN201710805813.1A CN201710805813A CN107574746B CN 107574746 B CN107574746 B CN 107574746B CN 201710805813 A CN201710805813 A CN 201710805813A CN 107574746 B CN107574746 B CN 107574746B
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Abstract
The invention relates to a connecting device for a prefabricated bridge deck space steel pipe concrete truss composite beam, which comprises a steel pipe truss and is characterized in that: the bridge girder also comprises a plurality of independent bridge decks which are sequentially paved on the upper part of the steel pipe truss along the longitudinal direction of the bridge, wherein two positioning grooves which are matched with two upper chord steel pipes of the steel pipe truss one by one are arranged on the lower end surface of each bridge deck, and the upper half parts of the upper chord steel pipes are in cambered surface contact with the positioning grooves; an upper groove for anchoring the prestressed reinforcement is formed in the upper end face of the bridge deck, an adjustable combined steel plate for anchoring the prestressed reinforcement is fixedly arranged in the upper groove, a steel strand penetrating hole is formed in the adjustable combined steel plate, an anchor is arranged on the combined steel plate, and the upper groove is filled with filler tightly; arc steel guide pipes are welded at the corresponding positions of the lower parts of the upper chord steel pipes, and the prestressed tendons penetrate through the arc steel guide pipes. The invention has the advantages of reducing construction difficulty, improving bridge deck construction quality, shortening construction period, improving safety of constructors and the like.
Description
Technical Field
The invention belongs to the technical field of space steel tube concrete truss composite beams, and particularly relates to a connecting device and a construction method of a prefabricated bridge deck space steel tube concrete truss composite beam.
Background
In the technical field of bridge construction, the space steel tube concrete truss composite beam is a novel bridge structure, and bridges with the structural form such as a dry sea son super-large bridge and the like are built. The bridge has the advantages that the dead weight is reduced by about 50 percent compared with that of a concrete simply supported beam with the same span, and the lower structural engineering quantity can be reduced while the span capacity of the bridge is increased, so that the bridge has a good development prospect.
At present, the construction of the steel pipe and concrete truss combined beam in space at home and abroad generally adopts methods of traction, sectional hoisting and the like to erect a steel pipe truss, then concrete is injected into an upper chord steel pipe and a lower chord steel pipe in an internal pressure mode, and after the concrete in the steel pipe meets the design requirement, the steel pipe truss is used as a support of a cast-in-place bridge deck slab, the bridge deck slab is erected at a high position, and the bridge deck slab is cast in situ. By adopting the method to cast the bridge deck, the template installation and the concrete casting are completed in situ at high altitude, the construction period is long, the construction difficulty is high, the bridge deck construction quality is not easy to guarantee, and great hidden danger exists in personnel safety and structural quality.
In order to shorten the construction period and ensure the construction quality of the bridge deck, the bridge deck can be poured before the steel pipe truss is installed, namely, the bridge deck and the steel pipe truss are pulled together or hoisted and erected, when the construction method is adopted, the bridge deck can increase the weight of the structure during installation, and for the bridge pier which is not high and can be provided with a temporary buttress site, a large-tonnage crane can be adopted to hoist the steel pipe truss with the bridge deck in a segmented manner; when the pier is higher or a temporary buttress cannot be arranged, the sectional hoisting by adopting a crane cannot be realized, and only the traction and erection can be adopted, and at the moment, the weight of the bridge deck plate generates great internal force when the structure is a large cantilever in the process of the traction and erection of the structure, so that the structural system and the construction method cannot be realized, and only the construction method of firstly erecting a steel pipe truss and then constructing the bridge deck plate can be adopted.
Aiming at the structural characteristics of the space steel tube concrete truss combined beam, a novel structural system and a construction method are developed, and the method has good practical significance for widening the application range of the novel structural site, shortening the construction period and ensuring the safety and construction quality of construction process personnel.
Disclosure of Invention
The invention provides a prefabricated bridge deck space steel pipe concrete truss combined beam connecting device and a construction method for reducing construction difficulty, improving bridge deck construction quality, shortening construction period and improving safety of constructors.
The invention adopts the technical proposal for solving the technical problems in the prior art that:
The utility model provides a prefabricated bridge deck space steel pipe concrete truss composite beam connecting device, includes steel pipe truss, its characterized in that: the bridge girder also comprises a plurality of independent bridge decks which are sequentially paved on the upper part of the steel pipe truss along the longitudinal direction of the bridge, wherein two positioning grooves which are matched with two upper chord steel pipes of the steel pipe truss one by one are arranged on the lower end surface of each bridge deck, and the upper half parts of the upper chord steel pipes are in cambered surface contact with the positioning grooves; an upper groove for anchoring the prestressed reinforcement is formed in the upper end face of the bridge deck, an adjustable combined steel plate for anchoring the prestressed reinforcement is fixedly arranged in the upper groove, a steel strand penetrating hole is formed in the adjustable combined steel plate, an anchor is arranged on the combined steel plate, and the upper groove is filled with filler tightly; arc steel guide pipes are welded at the corresponding positions of the lower parts of the upper chord steel pipes, and the prestressed tendons penetrate through the arc steel guide pipes.
The invention can also adopt the following technical measures:
The adjustable combined steel plate is characterized in that the adjustable combined steel plate is connected with a lower steel plate through a pin shaft, the upper steel plate can rotate up and down by taking the pin shaft as a circle center, the lower steel plate is fixedly connected with the bottom of an upper groove through a high-strength bolt and a nut, and is supported and subjected to prestress through a high-strength bolt rod, and an anchor is arranged on the upper steel plate.
The invention also provides a construction method of the prefabricated bridge deck space steel pipe concrete truss composite beam connecting device, which is characterized by comprising the following construction steps:
1) When the prefabricated bridge deck is installed, the combined steel plate is installed in the groove, and the lower steel plate of the combined steel plate is fixed at the bottom of the concrete in the upper groove through a high-strength bolt;
2) When the steel plates are assembled during installation, firstly, the upper steel plate is opened at a certain angle relative to the lower steel plate, the position of the upper steel plate is adjusted through a nut positioned between the upper steel plate and the lower steel plate, and then the lower steel plate is firmly fixed with the bottom of the upper groove through the nut at the bottom of the adjustment; after the position of the upper steel plate is adjusted, the upper steel plate is locked by a nut at the upper part;
3) Penetrating high-strength steel strands into steel strand penetrating holes formed between the upper steel plate and the lower steel plate, and anchoring the steel strands on the combined steel plate by single-end or double-end tensioning;
4) Filling sealing materials into the upper groove for sealing;
5) When the bridge deck needs to be replaced, firstly removing the filled sealing material, and then gradually loosening nuts at the bottom of the upper steel plate of the combined steel plate to enable the upper steel plate of the combined steel plate to rotate around the pin shaft, so that the tension of the prestressed steel strand is removed;
6) Lifting the damaged bridge deck by lifting equipment and placing the bridge deck at a designated position;
7) And (3) hoisting a new bridge deck plate through hoisting equipment, and then repeating the steps 1 to 4 to realize the installation of the plate.
The invention has the advantages and positive effects that: by adopting the combined beam structure, the bridge deck prefabrication can be performed simultaneously with the bridge lower structure, after the steel pipe truss is installed and the concrete is injected into the upper chord pipe and the lower chord pipe to reach the design strength, the prefabricated bridge deck can be installed block by block from the bridge head, and then the prestressed tendons are sequentially tensioned to be used for reinforcing the connection between the bridge deck and the space truss. Compared with the cast-in-situ bridge deck plate, the prefabricated bridge deck plate structure form does not need to be erected at a high position and the bridge deck plate is cast on site, and only one prefabricated bridge deck plate is fixedly connected with the steel pipe truss, so that a large amount of space operation is avoided, the construction period of the bridge is greatly shortened, the cost is reduced, the safety of personnel during construction is ensured, and the engineering quality is improved. When quality problems occur to the bridge deck boards during the service period of the bridge, only the prestressed tendons are required to be put, and a new prefabricated bridge deck board is required to be replaced.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a schematic cross-sectional view of a prefabricated deck;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a schematic cross-sectional view of an unloader within an upper recess;
FIG. 7 is a top view of an unloader in an upper recess.
In the figure: 1. steel pipe truss; 2. winding a steel pipe; 3. a lower chord steel pipe; 4. a web member; 5. an arc-shaped steel conduit; 6. a bridge deck; 7. a positioning groove; 8. an upper groove; 9. a combined steel plate; 10. a steel plate is arranged; 11. a lower steel plate; 12. a pin shaft; 13. an anchor; 14. a bolt; 15. a nut; 16. a filler; 17. prestressed reinforcement.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
Referring to fig. 1 to 7, a connecting device for a prefabricated bridge deck space steel pipe concrete truss composite beam comprises a steel pipe truss 1, wherein the steel pipe truss refers to the prior art and comprises two upper chord steel pipes 2, a lower chord steel pipe 3 and web members 4 for connecting the upper chord steel pipes and the lower chord steel pipes; the bridge girder also comprises a plurality of independent bridge decks 6 which are sequentially paved at the upper end of the steel pipe truss along the longitudinal direction of the bridge; arc steel guide pipes 5 are welded at the corresponding positions of the lower parts of the upper chord steel pipes; two positioning grooves 7 which are matched with two upper chord steel pipes of the steel pipe truss one by one are formed in the lower end face of each bridge deck, and the upper half parts of the upper chord steel pipes are in cambered surface contact with the positioning grooves; the upper end face of the bridge deck is provided with an upper groove 8 for anchoring the prestressed reinforcement 17, an adjustable combined steel plate 9 for anchoring the prestressed reinforcement is arranged in the upper groove, the adjustable combined steel plate is formed by connecting two steel plates of an upper steel plate 10 and a lower steel plate 11 through a pin shaft 12, the adjustable combined steel plate is formed by connecting the upper steel plate and the lower steel plate through a pin shaft, the upper steel plate can rotate up and down by taking the pin shaft as a circle center, and the lower steel plate is fixedly connected with the bottom of the upper groove through a high-strength bolt and a nut and is supported and stressed through a high-strength bolt rod. Specifically, the prestressed reinforcement is located between the upper chord steel pipe and the lower chord steel pipe, penetrates through the arc steel guide pipe, penetrates through the upper steel plate and the lower steel plate, stretches the prestressed reinforcement to control stress by using a stretching machine tool, anchors the prestressed reinforcement on the upper steel plate in the upper groove of the upper end face of the bridge deck by using an anchor 13 at the stretching end, and the upper groove is filled with filler 16 tightly.
The construction method of the prefabricated bridge deck space steel tube concrete truss composite beam comprises the following construction steps:
1) When the prefabricated bridge deck is installed, the combined steel plate is installed in the groove, and the lower steel plate of the combined steel plate is fixed at the bottom of the concrete in the upper groove through a high-strength bolt;
2) When the steel plates are assembled during installation, firstly, the upper steel plate is opened at a certain angle relative to the lower steel plate, the position of the upper steel plate is adjusted through a nut positioned between the upper steel plate and the lower steel plate, and then the lower steel plate is firmly fixed with the bottom of the upper groove through the nut at the bottom of the adjustment; after the position of the upper steel plate is adjusted, the upper steel plate is locked by a nut at the upper part;
3) Penetrating high-strength steel strands into steel strand penetrating holes formed between the upper steel plate and the lower steel plate, and anchoring the steel strands on the combined steel plate by single-end or double-end tensioning;
4) Filling sealing materials into the upper groove for sealing;
5) When the bridge deck needs to be replaced, firstly removing the filled sealing material, and then gradually loosening nuts at the bottom of the upper steel plate of the combined steel plate to enable the upper steel plate of the combined steel plate to rotate around the pin shaft, so that the tension of the prestressed steel strand is removed;
6) Lifting the damaged bridge deck by lifting equipment and placing the bridge deck at a designated position;
7) And (3) hoisting a new bridge deck plate through hoisting equipment, and then repeating the steps 1 to 4 to realize the installation of the plate.
At present, domestic construction equipment and construction technology can guarantee the prefabrication precision of the bridge deck, and the key of the structural system is whether the prefabricated bridge deck and the steel pipe truss can work together. According to the invention, the steel guide pipe is welded at the lower part of the upper chord steel pipe, the prestressed steel bar is penetrated and led to achieve the fixing effect, so that the connection between the bridge deck and the upper chord steel pipe is well enhanced, and the bridge deck and the upper chord steel pipe are prevented from relative shearing and sliding.
During the service period of the bridge, if a certain bridge deck plate has quality problems and needs to be replaced, the prestressed reinforcement unloading can be realized by screwing the high-strength nuts of the upper steel plate of the combined steel plate in the groove, and after the new bridge deck plate is replaced, the connection between the bridge deck plate and the space truss is completed by tensioning and anchoring the prestressed reinforcement. By adopting the method, the bridge can be maintained in a short period, and the effects of economy, time saving and safety can be achieved by convenient implementation.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, but any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (1)
1. The construction method of the prefabricated bridge deck space steel pipe concrete truss composite beam connecting device is characterized by comprising the following construction steps: 1) When the prefabricated bridge deck is installed, the combined steel plate is installed in the groove, and the lower steel plate of the combined steel plate is fixed at the bottom of the concrete in the upper groove through a high-strength bolt; 2) When the steel plates are assembled during installation, firstly, the upper steel plate is opened at a certain angle relative to the lower steel plate, the position of the upper steel plate is adjusted through a nut positioned between the upper steel plate and the lower steel plate, and then the lower steel plate is firmly fixed with the bottom of the upper groove through the nut at the bottom of the adjustment; after the position of the upper steel plate is adjusted, the upper steel plate is locked by a nut at the upper part; 3) Penetrating high-strength steel strands into steel strand penetrating holes formed between the upper steel plate and the lower steel plate, and anchoring the steel strands on the combined steel plate by single-end or double-end tensioning; 4) Filling sealing materials into the upper groove for sealing; 5) When the bridge deck needs to be replaced, firstly removing the filled sealing material, and then gradually loosening nuts at the bottom of the upper steel plate of the combined steel plate to enable the upper steel plate of the combined steel plate to rotate around the pin shaft, so that the tension of the prestressed steel strand is removed; 6) Lifting the damaged bridge deck by lifting equipment and placing the bridge deck at a designated position; 7) Hoisting a new bridge deck plate through hoisting equipment, and then repeating the steps 1 to 4 to realize the installation of the plate;
The connecting device for the prefabricated bridge deck space steel pipe concrete truss composite beam comprises a steel pipe truss, a plurality of independent bridge decks which are sequentially paved on the upper part of the steel pipe truss along the longitudinal direction of a bridge, wherein two positioning grooves which are matched with two upper chord steel pipes of the steel pipe truss one by one are formed in the lower end face of each bridge deck, and the upper half parts of the upper chord steel pipes are in cambered surface contact with the positioning grooves; an upper groove for anchoring the prestressed reinforcement is formed in the upper end face of the bridge deck, an adjustable combined steel plate for anchoring the prestressed reinforcement is fixedly arranged in the upper groove, a steel strand penetrating hole is formed in the adjustable combined steel plate, an anchor is arranged on the combined steel plate, and the upper groove is filled with filler tightly; arc steel guide pipes are welded at the corresponding positions of the lower parts of the upper chord steel pipes, and the prestressed tendons penetrate through the arc steel guide pipes;
The adjustable combined steel plate is characterized in that the adjustable combined steel plate is connected with a lower steel plate through a pin shaft, the upper steel plate can rotate up and down by taking the pin shaft as a circle center, the lower steel plate is fixedly connected with the bottom of an upper groove through a high-strength bolt and a nut, and is supported and subjected to prestress through a high-strength bolt rod, and an anchor is arranged on the upper steel plate.
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| CN201710805813.1A CN107574746B (en) | 2017-09-08 | 2017-09-08 | Connecting device for prefabricated bridge deck space steel pipe concrete truss composite beam and construction method |
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| CN201710805813.1A CN107574746B (en) | 2017-09-08 | 2017-09-08 | Connecting device for prefabricated bridge deck space steel pipe concrete truss composite beam and construction method |
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| CN108049301A (en) * | 2018-01-25 | 2018-05-18 | 中铁第勘察设计院集团有限公司 | The combining structure overpass of Midspan sag |
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| CN102409619A (en) * | 2011-11-11 | 2012-04-11 | 浙江大学 | A Method for Improving the Transverse Integrity of the Deck Structure of Multi-girder Composite Small Box Girder Bridges |
| CN103821087A (en) * | 2014-03-07 | 2014-05-28 | 天津城建大学 | Precast bridge deck space steel pipe concrete truss composite beam and construction method |
| CN207210932U (en) * | 2017-09-08 | 2018-04-10 | 天津城建大学 | Prefabricated bridge space concrete filled steel tube truss combination beamss attachment means |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100888926B1 (en) * | 2008-06-11 | 2009-03-16 | 노윤근 | Construction method of bridge fixing part |
| CN102808372B (en) * | 2012-08-20 | 2016-10-05 | 杨众 | The integral precast overlapping bridge of a kind of freely-supported and construction method |
| CN103774561B (en) * | 2014-02-11 | 2016-01-20 | 中铁二十三局集团第八工程有限公司 | The job execution of speedway prefabricated small box girder frock method streamlined |
| CN204676531U (en) * | 2015-04-17 | 2015-09-30 | 中建海峡建设发展有限公司 | Prestressed cable anchorage device |
| CN105421213B (en) * | 2015-11-26 | 2017-03-22 | 西安科技大学 | Construction method for main span structure of rigid frame bridge |
| CN106192756B (en) * | 2016-07-08 | 2018-08-07 | 苏交科集团股份有限公司 | Steel chord member-concrete bridge deck assembled combined bridge and construction method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409619A (en) * | 2011-11-11 | 2012-04-11 | 浙江大学 | A Method for Improving the Transverse Integrity of the Deck Structure of Multi-girder Composite Small Box Girder Bridges |
| CN103821087A (en) * | 2014-03-07 | 2014-05-28 | 天津城建大学 | Precast bridge deck space steel pipe concrete truss composite beam and construction method |
| CN207210932U (en) * | 2017-09-08 | 2018-04-10 | 天津城建大学 | Prefabricated bridge space concrete filled steel tube truss combination beamss attachment means |
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