Mixed prestress-based construction method of assembling type corrugated steel web combination box girder
A corrugated steel web and construction method technology, applied in the field of bridge construction, can solve the problems of easy transportation, hoisting and post-maintenance, and achieve the effects of being conducive to rapid erection, firm connection, and sufficient volume reduction
Active Publication Date: 2017-06-30
ENG DETECTION & REINFORCING CO LTD OF HENAN PROVINCIAL COMM PLANNING SURVEY & DESIGN INST CO LTD
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[0006] The present invention provides a construction method for assembled corrugated steel web composite box girder based on mixed prestress, aiming to solve the problems of transportation, hoisting and post-maintenance when the existing corrugated steel web PC composite box girder is applied to large bridges aspects of the problem
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[0033] The construction method of the assembled corrugated steel web composite box girder based on mixed prestressing of the present invention mainly includes the following steps:
[0034] In the first step, according to the design requirements of the bridge, I-shaped beam units are prefabricated separately (such as figure 1 Shown) precast concrete top slab 1, precast concrete bottom slab 2 and corrugated steel web 3:
[0035] Specifically, prefabs such as figure 2 In the case of the prefabricated concrete roof 1 shown, the roof reinforcement mesh with transverse connecting bars 1.1, longitudinal connecting bars and stud notches 1.2 is first bound, and the stud notches 1.2 are arranged on both sides of the roof reinforcing mesh at longitudinal intervals. Then install the negative moment prestressed channel 1.3 on the top of the pier in the steel mesh of the roof, and then pour it;
[0036] prefabricated as image 3For the prefabricated concrete floor 2 shown, the pre-tensi...
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The invention discloses a mixed prestress-based construction method of an assembling type corrugated steel web combined box girder. A combined girder body formed by transversely and longitudinally connecting multiple I-shaped girder body units, wherein each I-shaped girder body unit is formed by splicing a prefabricated concrete top plate, a prefabricated concrete base plate and a corrugated steel web plate which are independently prefabricated; transverse connection steel bars, longitudinal connection steel bars and top plate prestress ducts are buried in the prefabricated concrete top plates, and multiple upper stud notches are formed in two sides of the prefabricated concrete top plates along the longitudinal direction in a spacing manner; transverse connection steel bars, longitudinal connection steel bars, pretensioned prestress steel strands and base plate prestress ducts are buried in the prefabricated concrete base plates, and multiple lower stud notches are formed in two sides of the prefabricated concrete base plates along the longitudinal direction in a spacing manner; flange plates with stud groups are welded at the upper and lower ends of the corrugated steel webs. The girder body is erected in a block prefabricated and assembled structural form; the volumes and the weights of all the components are relatively small, so that the girder body can be stably transported and safely hung and is favorable for construction.
Description
technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method of an assembled corrugated steel web composite box girder based on mixed prestressing suitable for large bridges. Background technique [0002] Traditional prefabricated box girder webs are mostly made of concrete, which is heavy and easy to crack. Therefore, concrete box girders are only suitable for highway bridges with small spans (less than 40m). The PC corrugated steel web box girder adopts corrugated steel plate with high shear efficiency as the web, which not only reduces the self-weight of the box girder, but also prestresses can be efficiently applied to the concrete roof and floor due to the unique "fold effect" of the corrugated steel web In recent years, it has been widely used in large and medium-sized bridges (spans above 50m). [0003] The existing PC composite box girders with corrugated steel webs mostly adopt the following two ...
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IPC IPC(8): E01D21/00E01D2/04
CPCE01D2/04E01D21/00
Inventor 李斐然杜战军马亚丽孙炜玮赵彩菊
Owner ENG DETECTION & REINFORCING CO LTD OF HENAN PROVINCIAL COMM PLANNING SURVEY & DESIGN INST CO LTD
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