Line shape control method for short line method segment prefabrication construction

Abstract

The invention discloses a line shape control method for short line method segment prefabrication construction and relates to the field of control of bridge construction. The method comprises the following steps of: calculating a theoretical prefabrication line shape according to the line shape of bridge design and the construction sequence by a tangent displacement method; building the global coordinate system of the prefabrication line shape and the local coordinate systems of all prefabrication segments; converting segment control points between the local coordinate systems and the global coordinate system by a matrix calculation method; processing errors by a non-linear least square method, and correcting coordinates of segment nodes in the global coordinate system; and adjusting the line shapes of subsequent segments by a direct adjustment method or a segmentation adjustment method according to the errors. According to the method, the errors are processed by the non-linear least square method, so the method is high in calculation speed; the influence of position errors of matched segments, measurement errors of a control point coordinate, and template errors on the prefabrication line shape is comprehensively considered, the control accuracy of the line shape is improve obviously, and the popularization of a short line method segment construction method in China is accelerated.

Description

technical field [0001] The invention relates to the field of bridge construction control, in particular to a method for controlling segmental prefabricated construction alignment by short-line method. Background technique [0002] At present, more and more prestressed concrete bridges in China adopt the segmental prefabrication and assembly construction method. The core of this construction method lies in the segmental prefabrication. The methods of segmental prefabrication are divided into long-line method and short-line method. The long-line method segmental prefabrication has a history of more than ten years in China, and the construction technology is relatively mature, while the short-line method segmental prefabrication is rarely used in China due to its complex construction technology, high measurement accuracy requirements, and complicated alignment control. [0003] The short-line method of segmental prefabrication has a short construction period, occupies less spa...

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Problems solved by technology

Domestic projects try to avoid using the short-line prefabrication method, because there is no effective control method in domestic actual projects using the short-line method for segmental prefabrication, and the control accuracy of the bridge alignment cannot meet the requirements, which limits the development of the short-line method. Affected the progress of bridge construction in my country

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