Construction method of large-span post-tensioned prestressed longitudinal and transverse frame beams

Abstract

The invention discloses a construction method of large-span post-tensioned prestressed longitudinal and transverse frame beams, which comprises the steps of erecting a supporting body, producing a template, arranging a base template and a unilateral template, rolling longitudinal main reinforcements, installing a corrugated tube, rolling hoop reinforcements, embedding utility pipelines, mounting prestressing steel wires, mounting an anchor backing plate, closing a lateral templates, filling concrete grouts, pretensioning and grouting pore canals; in the pretensioning, the prestressing tendons of beams are stretched according to the following steps: (1) firstly, the frame beams at the top layer are stretched and then frame beams at the following layers are stretched; (2) the short spans of the longitudinal and transverse frame beams at the same layer are stretched first, and then the long spans thereof are stretched; (3) the upper prestressing tendon of a building unit is stretched first, and then the lower prestressing tendon thereof are stretched; and the left line and the right line of prestressing tendons are stretched symmetrically and separately. The construction method adopts a stretching order from the upper layer to the lower layer and can construct the prestressed frame beams in accordance with an ordinary reinforced concrete structure layer by layer, thereby being capable of reducing the influence of concrete curing on the construction period and accelerating work progress.

Description

(1) Technical field [0001] The invention relates to a construction method for large-span prestressed post-tensioned vertical and horizontal frame beams, which is suitable for the construction of 2-3-story frame passenger station buildings for railways, highways, etc., and belongs to the technical field of building construction. (2) Background technology [0002] Passenger station buildings, waiting rooms, entrance halls, ticket halls, etc. of railways and roads require large space and high headroom. At present, the commonly used methods are: ordinary frame structure and unidirectional prestressed frame structure. Ordinary frame structures require many frame columns, small column spacing, and large beam sections; unidirectional prestressed frame structures, although the column spacing is increased in one direction and the beam height is reduced, the overall effect is poor. Therefore, ordinary frame structures and unidirectional prestressed frame structures cannot meet the fu...

AI Technical Summary

Problems solved by technology

The disadvantage is that it takes a long time

[0004] The construction of long-span prestressed post-tensioned vertical and horizontal frame beams has the characteristics of large span, many interspersed processes, and tension can easily cause cracks in the surrounding cast-in-place slabs. The determination of the tension construction sequence is the key point of construction, and it is difficult to guarantee the construction quality by conventional methods

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