Construction method for high-altitude section prefabricating, beam moving, beam storing and assembling of large concrete box beam

Abstract

The invention discloses a construction method for high-altitude section prefabricating, beam moving, beam storing and assembling of a large concrete box beam, which is characterized by comprising the following steps: 1) erecting a high-pile prefabricated platform; 2) erecting beam moving steel tube supports and steel slide rails between the high-pile prefabricated platform and a pier; 3) pouring a matched beam section on the high-pile prefabricated platform; 4) using the poured matched beam section as the end die at one end of the next new beam section to be poured and pouring the new beam section; 5) after pouring the new beam section, transporting the matched beam section to the design position as the beam section to be assembled and simultaneously moving the new beam section forward as the next matched beam section; 6) longitudinally moving the beam section to be assembled to the matching surface of the end of the assembled beam section as the beam section to be assembled and adjusting the position of the beam section to be assembled to ensure the beam section to be assembled to conform to the requirement of split joint with the assembled beam section on the pier; and 7) carrying out split joint on the beam section to be assembled and the assembled beam section. By section prefabricating and long-time beam storing of the beam sections, the construction method effectively ensures the prefabricated beam sections to complete most contraction deformation of the beam body in free state and eliminates the contraction difference of the adjacent beam sections caused by different ages, thus eliminating cracks.

Description

technical field [0001] The invention belongs to bridge construction methods, and in particular relates to a construction method of high-altitude segmental prefabrication, beam moving, beam storage and assembly of large concrete box girders. Background technique [0002] At present, domestic and international construction of large concrete box girders generally adopts segmental cast-in-place construction. However, during the construction process, due to the restriction of the shrinkage of the concrete poured in the previous segment on the shrinkage of the concrete poured in the latter segment, poor concrete shrinkage occurs, resulting in cracks. At the same time, since the concrete pouring is mostly divided into sections according to the entire span, the volume of a single-section beam is too large, so that the beam section is prone to free shrinkage cracks due to its own constraints. [0003] In China, most bridges of this type require continuous pouring across the entire sp...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method of high-altitude segmental prefabrication, beam moving, beam storage, and assembly of large concrete box girders, so as to solve the problems caused by the shrinkage and creep of the beam body and the settlement of the support during the construction process of the overly long beam section. The problem of cracks caused by deformation

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