U beam prefabrication cast-in-place design construction method

Abstract

The invention discloses a U beam prefabrication cast-in-place design construction method. The method comprises the steps that a U beam is integrally designed and divided into a vertical web part and a horizontal bottom plate part along the cross section of the U beam; after pouring of the vertical web part and middle and bottom prestressing tendon stretching and anchor sealing are finished, the vertical web part is hoisted to the position above a bridge pier and is fixed in the longitudinal direction of a bridge; the vertical web part on the bridge pier is utilized as a foundation for arrangement of a hanging frame and a bottom die, and field pouring of the horizontal bottom plate part is finished; and finally, a top longitudinal prestressing tendon and a bottom plate transverse prestressing tendon of a vertical web are stretched, and anchor sealing is conducted. The U beam prefabrication cast-in-place design construction method effectively solves the problems that underbridge traffic cannot be closed, the clearance requirement is high, and construction time is tense are effectively solved; the construction quality is guaranteed, and in the aspect of construction measures, economization is further achieved compared with an original traditional design construction method; and the construction period is short, and the construction time is short.

Description

Technical field [0001] The invention relates to a U-beam pouring design and construction method, which belongs to the technical field of traffic engineering bridges, and specifically relates to a U-beam precast cast-in-situ design and construction method for situations where traffic under the bridge cannot be closed, construction clearance requirements are high, and construction period is tight . Background technique [0002] In some bridges and railway construction double-track projects in the existing technology, some simply supported post-tensioned U-beam bridges are 2.6m high, 6.8m wide, 25m wide, 350t heavy, and across the highway. The traditional design is a one-time existing Pouring molding, traditional construction adopts full house bracket or steel pipe less bracket method for one-time cast-in-place construction. However, this design and construction method is suitable for under-bridge construction that can close or partially close traffic, under-bridge clearance requir...

AI Technical Summary

Problems solved by technology

However, this design and construction method is suitable for the situation where the traffic under the bridge can be closed or partially closed, the clearance requirement under the bridge is not high, and the construction period is not tight. However, the traffic under the bridge cannot be closed, the construction clearance requirement is high, and the construction period In a tense situation, the traditional design and construction methods will show corresponding shortcomings; at the same time, due to the low elevation of the original line of the existing line, the design of the double line needs to be basically consistent with the elevation of the existing line, resulting in a high requirement for the construction clearance under the bridge

Due to the heavy weight of the U-beam, if one-time prefabricated hoisting is used, a large-tonnage crane is required, and it is limited by transportation roads and traffic control, so the technical and economic performance is not high

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