A construction method of continuous composite beam

A construction method and technology of composite beams, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of easy cracking, high stress, low service life, etc., to increase crack resistance, increase service life, prevent Effect of quality accident or safety accident

Active Publication Date: 2022-04-08
CHINA RAILWEY ENG SERVICE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems in the prior art that the internal stress of the bridge is large, cracks are prone to occur, and the service life is low, the present invention provides a continuous composite beam construction method, the purpose of which is to divide the internal stress of the bridge into multiple sections, each section The stress of the segment is not connected, preventing the development of cracks and prolonging the service life of the bridge

Method used

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  • A construction method of continuous composite beam
  • A construction method of continuous composite beam
  • A construction method of continuous composite beam

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Embodiment 1

[0060] A construction method for a continuous composite beam, comprising the following steps:

[0061] Step [1]: Make prefabricated bridge pieces. In this embodiment, a total of three specifications of prefabricated bridge pieces are provided, namely No. 1 prefabricated bridge piece 1, No. 2 prefabricated bridge piece 2 and No. ③ prefabricated bridge piece 3, and the size of the prefabricated bridge piece is set according to the specific conditions of the bridge. The concrete pouring process is set in the beam prefabrication field for industrial production, and the prefabricated bridge pieces are constructed using the pretensioning method. In this embodiment, the diameter of the steel bar of the prefabricated bridge piece is 20cm, and 35cm of prestressed tendons 10 are reserved on the left and right sides. Leave 30cm ~ 40cm of prestressed tendons. The prestressed tendons of the bridge deck are provided with two layers, and the prestressed tendons of the lower layer are arran...

Embodiment 2

[0069] This embodiment is basically the same as the technical solution of the first embodiment, the difference is that between steps [6] and [7], a link of applying adhesive to the cross-section of the prefabricated bridge piece is added. Remove the loose concrete at the section of the prefabricated bridge piece, remove impurities such as oil stains and dust, and dry the concrete at the section of the prefabricated bridge piece, and then apply adhesive on the section of the prefabricated bridge piece. The adhesive used in this embodiment The invention is a chemical concrete mixture made by mixing epoxy resin and cement, and belongs to the commonly used binder in the prior art. The adhesive is applied evenly, the thickness is controlled between 0.5mm and 1mm, and the bonding strength between the adhesive and the concrete is greater than that of the concrete. In order to stabilize the adhesive on the section of the prefabricated bridge sheet, after applying the adhesive, apply p...

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Abstract

The invention belongs to the technical field of bridge engineering, and in particular relates to a continuous composite beam construction method. It solves the problems of large internal stress, easy cracks and low service life of the bridge in the prior art. The technical solution is: including prefabricated bridge pieces, applying prestress to each prefabricated bridge piece, building supports and lifting equipment, and hoisting bridge piers. Prefabricated bridge pieces, simultaneous hoisting of prefabricated bridge pieces in the mid-span, joint reinforcement, pouring concrete and other steps. The invention divides the prestress of a span beam into multiple sections, the joints are not affected by the prestress, the probability of cracks is greatly reduced, and the cracks will not develop to the adjacent prefabricated bridge pieces, and the service life of the bridge is improved. Increased and shortened the construction time of bridges, improved engineering efficiency, and reduced the adverse impact of construction projects on traffic. The invention is suitable for the construction of bridges with high traffic or construction period requirements.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, in particular to a construction method of a continuous composite beam. Background technique [0002] Continuous beams are beams with three or more supports in construction, construction, aviation, and pipeline projects. With the rapid construction of expressways and high-speed railways, many long-span continuous girder bridges have appeared. The commonly used construction methods are hanging baskets, scaffolding, etc. The construction process is complicated and requires comprehensive pouring construction on site. A long time often becomes the limit of the entire project progress. [0003] The domestic bridge construction is all concrete reinforced prestressed bridges, and most of the construction techniques such as hanging basket construction and full house scaffolding are used in the construction. This kind of construction technology is a common bridge construction now, which can en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 冯赟杰吴小平段文军范志勇罗杭飞刘昊吴瑶
Owner CHINA RAILWEY ENG SERVICE CO LTD
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