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Bridge cast-in-cantilever method cradle counter-pressure construction method

A construction method and technology for bridges, which are applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve the problem of difficult to meet the needs of large-span variable-section continuous box girder and rigid-frame bridges, and it is difficult to accurately simulate hanging basket pouring. Work status, limited work space and other problems, to achieve the effect of simple structure, easy control and high safety

Inactive Publication Date: 2014-11-05
JIANGSU PROVINGIAL TRANSPORTATION ENG GRP
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] According to the applicant's knowledge, for a long time, the preloading method of the bottom mold of hanging basket casting has been directly loaded with sand bags or water bags, which is not only time-consuming and expensive, it is difficult to accurately simulate the actual working state of hanging basket casting, and due to the Space is limited and the number of piled loads is limited, so it is often difficult to meet the cantilevered preloading construction needs of long-span variable-section continuous box girders and rigid frame bridges

Method used

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  • Bridge cast-in-cantilever method cradle counter-pressure construction method

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Embodiment 1

[0022] For the construction method of bridge suspended pouring and hanging basket back pressure construction method in this embodiment, please refer to figure 1 , the hanging basket is at the front ends of the two cantilevers of the T structure (only one end is shown in the figure). In order to ensure the balanced stress at both ends of the T structure, the loading of the two hanging baskets at both ends of the cantilever should be basically synchronized to reduce its unbalanced bending moment. The method comprises the following steps during concrete implementation:

[0023] The first step is to construct the foundation section of the bridge—construct the foundation section of the bridge according to the predetermined design, and its longitudinal section in the longitudinal direction is as follows: figure 1 As shown, the top beam plate A and the bottom beam plate B are connected by a beam pier with a manhole, and the whole is in the shape of an "I", and its end face is as fol...

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Abstract

The invention relates to a bridge cast-in-cantilever method cradle counter-pressure construction method, and belongs to the technical field of building construction. The method comprises the following steps: constructing a bridge foundation section, mounting cradles and a casting bottom die, manufacturing a counter-pressure mechanism, mounting the counter-pressure mechanism, placing a pressing device, regulating pressure and performing loading and detecting, and finally, realizing the actual working state of the cradle casting. The method is characterized in that by controlling the pressure of a hydraulic oil jacking device, the base die is downwards pressed, a hanging rod is upwards pulled, the actual stress of the cradles is simulated, and the deformation parameters of each part of each cradle are measured, so that the reliability of the cradles is verified, the non-elastic deformation of the cradles is eliminated, and the formwork erection elevation is convenient to correct. The method disclosed by the invention overcomes the defects of a traditional preloading method and can be used for accurately simulating the actual stress situation of the cradle construction in the cast-in-cantilever method, and the method has the advantages of easy control of preloading, high safety, good stabilization, time conservation, labor conservation and lower cost. The method can satisfy the requirements of various kinds of cast-in-cantilever construction.

Description

technical field [0001] The invention relates to a bridge suspension pouring construction method, in particular to a bridge suspension irrigation construction hanging basket back pressure construction method, which belongs to the technical field of building construction. Background technique [0002] Bridge cantilever pouring (referred to as cantilever pouring) is a common construction method for contemporary continuous rigid frame bridge buildings. The key step is to suspend and fix the concrete pouring base form with the help of temporary support rigid member hanging baskets that bear the weight of concrete poured in cantilever construction. And pre-press the pouring bottom form to eliminate the plastic deformation of the hanging basket and measure the elastic deformation, and then make compensatory adjustments according to the elastic deformation, so as to ensure that the elevation of the cantilever bridge section after pouring meets the predetermined design. Then move the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/10
Inventor 孙世全
Owner JIANGSU PROVINGIAL TRANSPORTATION ENG GRP
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