A construction method for dismantling upward moving formwork for bridge construction

Abstract

The invention discloses a demolition construction method of an upstroke type movable formwork frame for bridge construction. The problems that in the prior art, demolition of a movable formwork frameat a high altitude is difficult, curve section lowering interferes with an existing beam surface, and the demolition difficulty is high are solved. The demolition construction method of the upstroke type movable formwork frame for bridge construction comprises the steps that step 1, hoisting rods are dismantled, a temporary hoisting basket is installed above main beams, and a formwork system and an external hanging system are sequentially dismantled through the temporary hoisting basket; step 2, the main beams are longitudinally moved to two piers, a front auxiliary supporting leg and a rear auxiliary supporting leg are dismantled, and cross beams are connected; step 3, transverse lengthening sections of a front main supporting leg and a rear main supporting leg are installed; and step 4,two hoisting frames are installed on the beam surface of a bridge, the two hoisting frames are correspondingly positioned above the two piers at which the main beams are positioned, the two main beamsare lowered to the ground at the same time, and the main beams are dismantled. The demolition construction method of the upstroke type movable formwork frame for bridge construction has the beneficial effects that two methods of selecting a continuous jack to lower the external hanging system of the formwork frame in a grouping mode and using a tower crane to dismantle the external hanging systemof the formwork frame piece by piece are combined according to the practical situation of a site, and the external hanging system of the movable formwork frame is dismantled safely.

Description

technical field [0001] The invention relates to the technical field of road and bridge mobile formwork construction, in particular to a construction method for dismantling an upward mobile formwork used in bridge construction. Background technique [0002] The main girder of the railway mobile formwork is operated at a height above 56m from the ground, so the wind force on the top of the pier is relatively strong, and the construction section is a flat curve with a radius of 1200m. When the mobile formwork is removed, it will interfere with the poured beam surface of the curved section. Affecting the normal lowering, the site outside the curve cannot stand the crane. It is difficult to dismantle large-scale components at a height of more than 56m using the existing technology. The existing mobile formwork is constructed under such working conditions, and it is difficult to carry out safe, economical and effective demolition. Contents of the invention [0003] The embodime...

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Problems solved by technology

[0003] The embodiment of the present invention provides a method for dismantling the upward mobile formwork for bridge construction, which is used to solve the problems in the prior art that it is difficult to dismantle the mobile formwork at high altitude, and the lowering of the curved section interferes with the existing beam surface, making the removal difficult.

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