Construction method for suspension bridge gravity type anchorage porous annular foundations

Abstract

The invention discloses a construction method for suspension bridge gravity type anchorage porous annular foundations. The construction method comprises the following steps that the multiple annular foundations are prefabricated; the first layer of annular foundation is put in a to-be-installed position, and soil is taken evenly and symmetrically in a sector area and a wellhole of the first layerof annular foundation till the first layer of annular foundation sinks to the set depth; the second layer of annular foundation is installed on the first layer of annular foundation, head swing rebarson the second layer of annular foundation and head swing rebars on the first layer of annular foundation are bound and connected, a template is supported at joints, and concrete is poured; soil is taken evenly and symmetrically in sector areas and wellholes of the first layer and second layer of annular foundations till the first layer of annular foundation sinks to the set depth; a layer of annular foundation is installed on the topmost layer of annular foundation till the bottom of the first layer of annular foundation reaches the design elevation and is stabilized, and then construction isstopped; pouring of top seal concrete and a cast-in-place cover plate is conducted. Construction safety can be ensured through the suspension bridge gravity type anchorage porous annular foundations.

Description

technical field [0001] The invention relates to a large-scale bridge foundation structure, in particular to a construction method for a gravity-type anchorage porous annular foundation of a suspension bridge. Background technique [0002] The anchorage is an important part of the suspension bridge, which transfers the load from the main cable to the foundation. Anchors are mainly divided into tunnel anchors and gravity anchors. However, due to the high requirements on engineering geological conditions, tunnel anchors are rarely used in practical engineering. According to the data collected by Lou Zhuanghong of 59 large-scale suspension bridges with a span of more than 400m in foreign countries, only 5 bridges adopt tunnel anchorage. In China, only the Chongqing Egongyan Yangtze River Bridge, the Baling River Suspension Bridge, the Sidu River Extra Large Suspension Bridge, and the Aizhai Suspension Bridge among the super bridges under construction or to be built use tunnel a...

AI Technical Summary

Problems solved by technology

If the multi-hole hole layout is adopted, although the force is better, due to the large number of holes, there are large-area solids between the round holes in the plane, and the soil under the solids is difficult during the sinking process of the caisson foundation. If it is cleared, it will cause greater frontal resistance, difficulty in sinking and a large amount of concrete in the well body, which will add more machinery and manpower to make it sink, which is also unfavorable to the construction period, and more concrete in the well body will increase the construction cost

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