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Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method

A technology of concrete box girder and construction method, which is applied in manufacturing tools, ceramic molding machines, ceramic molding workshops, etc., can solve the problems of lack of mature technology, high technical requirements, and difficult engineering, and achieves good outline size and strong operability. , Lifting and easy installation

Active Publication Date: 2008-02-20
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The 32m / 900t class post-tensioned prestressed concrete box girder adopted by the Hening Railway is a single box section structure with a beam length of 32.6m, a span of 31.5m, a beam width of 13.0m, a beam end height of 3m, and a mid-span beam height of 2.8m. Up to 830 tons; it has the characteristics of large volume, self-heavy weight, and large width-to-span ratio. Its prefabricated construction is the first in China. A new technical scheme suitable for the prefabricated construction of box girders in this road section

Method used

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  • Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method

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Embodiment

[0048] The technical process of the post-tensioned prestressed concrete box girder whole hole prefabrication construction method in this embodiment is shown in Figure 1, and its main steps include:

[0049] (1) Install templates, steel bars and embedded parts, etc.:

[0050] The steps mainly include: repairing the bottom mold, adjusting the side mold, installing the support plate and the anti-drop beam plate, installing the drawing hose, hoisting the main steel bar, installing the embedded parts of the beam body, hoisting the inner mold, installing the end mold, Hoisting surface reinforcement, bridge deck embedded parts installation, etc.

[0051] In this step:

[0052] Both the main reinforcement and the bridge deck reinforcement adopt centralized pre-tie-up and overall hoisting technology, that is, the processing of the box girder reinforcement (including the main reinforcement and bridge deck reinforcement) is completed in the reinforcement workshop, and then bound on the ...

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Abstract

The present invention discloses a monolithic prefabricated construction method of post-tensioned prestressed concrete box grider, which mainly comprises the following steps: moulding board, reinforcing steel bar and embedded part installation, grider concrete packing, grider concrete steaming or natural maintenance, moulding removal, tension, and postorder construction, etc, wherein, the reinforcing steel bar adopts the technologies of centralized prewing, and overall hoisting, and the tension step adopts three tension techniques of pretension, first tension and final tension; the internal die adopts a hydraulic internal die system, and the grider concrete packing step adopts the construction proposal of concrete centralized mixing, and pipeline pumping pouring, which adopts a decentralized and continuous process, and pours gradually from two ends to the middle so as to realize one-though moulding. The construction method of the present invention is suitable for monolithic prefabricated construction of prestressed concrete box grider with 32m / 900t big span and large tonnage in the special railway line for passenger transport.

Description

technical field [0001] The invention relates to a construction method of a prestressed concrete structure of a bridge engineering, and belongs to the technical field of girder bridge prefabrication. Background technique [0002] Prestressed concrete structure is developed from ordinary reinforced concrete structure. It is the abbreviation of prestressed reinforced concrete. The scope of use of reinforced concrete and other aspects have shown good results. It has been widely used in industrial and civil buildings, bridges, sleepers, pressure pipes, poles, piles, liquid storage and gas storage tanks, etc. [0003] The box girders of Qinshen Passenger Dedicated Line that have been built in China are 20m and 24m, with a maximum weight of 570 tons. The construction methods of box girder prefabrication include formwork engineering, reinforcement engineering, concrete engineering, prestressing engineering, etc. Due to the small span and beam weight of the box girder, the technic...

Claims

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Application Information

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IPC IPC(8): B28B7/22B28B15/00B28B23/04B28B11/00
Inventor 韩伟邹宏伟王强孙祖红周文武钟士全申超袁东周玉兴钟卫翔
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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