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Prefabricated continuous box girder bridge with saddle shell bottom and its construction method

A prefabricated and saddle technology, which is applied in erection/assembly of bridges, bridge construction, bridges, etc., can solve the problems of difficult tension and anchorage of prestressed steel bars in the lower part, large consumption of wooden formwork, and large workload of concrete, so as to achieve assembly and construction The effect of fast speed, no support construction, and convenient anchor construction

Inactive Publication Date: 2014-10-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, concrete continuous box girder viaducts with small and medium spans usually adopt the construction method of pouring on site, which is an ancient construction method. The construction method of pouring concrete on site and applying prestress has the advantages of good integrity, simple construction technology, and no system conversion during construction. Deficiencies such as difficulty in tensioning and anchoring of prestressed steel bars and long construction period

Method used

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  • Prefabricated continuous box girder bridge with saddle shell bottom and its construction method
  • Prefabricated continuous box girder bridge with saddle shell bottom and its construction method
  • Prefabricated continuous box girder bridge with saddle shell bottom and its construction method

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Embodiment 1

[0035] The assembled saddle shell-shaped bottom plate continuous box girder bridge of the present invention consists of a saddle shell-shaped plate 1, a top ring beam 2, a corrugated steel web 3, a column stud 4, a prestressed concrete top plate 5, a concrete diaphragm 6, and an in vitro The prestressed tendons 7 and the zero segment 8 of the concrete box girder are formed. The saddle shell bottom plate 1 is a prefabricated pre-tensioned high-efficiency prestressed concrete saddle shell plate. The upper sides of the saddle shell bottom plate 1 are respectively connected to a top ring beam 2 at both ends in the transverse direction, and are used as the bottom plate member of the continuous box girder bridge. A corrugated steel web 3 is arranged between the top of the crimping ring beam 2 and the prestressed concrete roof 5, the lower end of the corrugated steel web 3 is connected to the top of the crimping ring beam 2, and the upper end is connected to the prestressed concrete r...

Embodiment 2

[0037] A method for building a continuous box girder bridge with an assembled saddle shell-shaped bottom plate, comprising the following steps:

[0038] The first step is to pour concrete piers on site, install the pot bearings of the continuous box girder bridge, hoist the factory-fabricated saddle shell-shaped bottom plate 1 with topping ring beams 2 to the pier, and use several steel brackets to temporarily support the saddle shell Shaped bottom plate 1, the reserved reinforcement at the end of saddle shell shaped bottom plate 1 at the welding connection support, pouring concrete at the joint;

[0039] The second step is to hoist the corrugated steel web 3 into place, firmly weld the lower ends of the left and right corrugated steel webs 3 to the pre-embedded steel plate on the top of the top ring beam 2, and firmly weld the double row of columnar studs 4 to the corrugated steel web On the top surface of the upper flange of 3, a temporary transverse steel support is install...

Embodiment 3

[0044] A rail transit viaduct is composed of multiple continuous girder viaducts with seven spans and one connection. It adopts a prestressed concrete continuous girder structure of 7 spans × 30 meters. The box girder adopts a single-box single-chamber cross-section. , using the fabrication method of continuous box girder bridge with saddle shell bottom plate. The width of the box girder floor is 4 meters, the width of the bridge deck is 7 meters, the beam height is 2.5 meters, and the vehicle load is road-I class. The pre-tensioned prestressed concrete saddle slab is selected as the bottom plate of the box girder. The prefabricated saddle slab is poured with C60 concrete. The thickness of the middle plate is 150mm, the thickness of the plate at the support is 350mm, the height of the parabola of the shell plate is 400mm, and 36 7φ5 steel strands are arranged inside. The cross-section of the saddle plate topping ring beam is rectangular, with a section of 300×500mm. The toppi...

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Abstract

The invention provides an assembly type saddle-shell-shaped bottom plate continuous box girder bridge. A construction method of the assembly type saddle-shell-shaped bottom plate continuous box girder bridge includes utilizing a pretensioned prestress concrete saddle shell plate as a bottom plate of the continuous box girder bridge and a corrugated steel web plate as a web plate of the continuous box girder bridge, casting a prestress concrete top plate of the continuous box girder bridge sectionally on site, and tensioning anchorage top plate prestress reinforcing ribs in batch to form a novel integral assembly type continuous box girder bridge. The preformed pretensioned concrete saddle shell plate is utilized to substitute for a cast flat bottom plate of the concrete box girder bridge, a bottom wood formwork and a support scaffold are omitted during construction of the concrete box girder bridge, and the box girder bridge can be used as a temporary construction platform, so that construction load of on-site concrete casting is reduced, and prestress tension anchorage construction process of the lower portion of the continuous box girder bridge is simplified. The novel assembly type saddle-shell-shaped bottom plate continuous box girder bridge has the advantages of high construction speed, no support construction, good structural integrity, attractive modeling, low manufacturing cost and the like, and is particularly applicable to a rail transit viaduct with large standard span and long mileage.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a construction technology of an assembled bridge structure, in particular to an assembled continuous box girder bridge with a saddle shell-shaped bottom plate. Background technique [0002] Prestressed concrete continuous box girder bridge has been widely used in highway bridges with small and medium spans because of its beautiful appearance and strong applicability. The multi-span continuous girder bridge structure usually adopts the form of prestressed concrete box section. The closed thin-walled box section has a large torsional rigidity, and the roof and floor have large areas, which can not only resist huge flange pressure, but also meet The layout of prestressed reinforcement needs to be able to effectively resist positive and negative bending moments. The prestressed concrete continuous box girder bridge has the advantages of strong spanning capacity, high structural safety...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D2/04E01D21/00
Inventor 徐文平陈有春涂永明张宇峰张建东刘其伟洪志强石先旺苏刘
Owner SOUTHEAST UNIV
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