Framing demounting supporting structure of spandrelless arch bridge of over crossing operation highway and construction method

Abstract

The invention relates to a framing demounting supporting structure of a spandrelless arch bridge of an over crossing operation highway. The supporting structure is characterized by being mainly composed of an intermediate support, a bowl-button full support, a full support spiral steel pipe support and a frame support; the intermediate support comprises two spiral steel pipes, a transverse rod and a shearing force support are welded between the spiral steel pipes, the bottoms of the spiral steel pipes and a strip foundation are anchored, and the tops of the spiral steel pipes and a bridge body are anchored through a U-shaped screw; the bowl-button full support is provided with a shearing force support, a top support and a small wood wedge block, and the small wood wedge block is plugged between the top support and the bridge body; the spiral steel pipe support is additionally arranged at the bowl-button full support; and the frame support is formed by box iron in a welded manner, a shearing force support is arranged inside the frame support, an arc-shaped top support is arranged at the top of the frame support, and a shearing force key of the arc-shaped top support is inserted into an arch bridge arch ring. The supporting structure has the beneficial effects of being safe and reliable in construction and high in stability, having no influences on normal traffic, and having the good economic and technological benefits.

Description

technical field [0001] The invention relates to a supporting structure for section demolition of a bellyless arch bridge, in particular to a section demolition support structure for an upper-span operation road without a belly arch bridge. technical background [0002] With the continuous increase of demolition projects of bellyless arch bridges, safety accidents in the demolition process continue to occur. During the demolition process, it is necessary to ensure the construction safety of the tie beams and arch ribs of the main bridge, especially the stability of the arch ribs, the prestress release of the tie beams, and the impact on the traffic safety of the expressway during the demolition process. There is an urgent need for a safe and effective demolition support structure that does not affect the traffic. [0003] The traditional methods of demolishing arch bridges include manual demolition, mechanical demolition, direct demolition, support demolition, and hoisting d...

AI Technical Summary

Problems solved by technology

Although these demolition methods play the purpose of demolishing the arch bridge, there are also many shortcomings.

The manual demolition method has slow construction speed and high noise, and is only suitable for the deck system or partial demolition of small bridges and large and medium-sized bridges; mechanical demolition is economical and requires strict construction organization and construction monitoring; direct demolition method is noisy and dusty Severe pollution and slow speed, suitable for bridges with small spans, short bridges, and completely abolished bridges. The construction is difficult and economical, and requires fine calculation, construction organization, and worker monitoring; traditional support The demolition method does not pre-jack the support structure to verify the stability of its support system, and does not release the prestress of the bridge body, and the support at the arch ring is also difficult

These demolition methods also have a common shortcoming that will affect the normal traffic of the road below the bridge

Therefore, the traditional demolition method is not suitable for partial demolition of the arch bridge and special projects that do not affect the opening to traffic.

Images