Land oversized open caisson subsidence construction method

Abstract

The invention relates to a bridge foundation construction method, in particular to a land oversized open caisson subsidence construction method. The method is characterized by comprising the following steps of: firstly, excavating a deep well at intervals around an open caisson, descending the water level of the open caisson by using the deep well around the open caisson, supplementing water in the open caisson at the same time of maintaining draining outside the open caisson in case that the underwater level outside the open caisson can not further descend so that the water level of the open caisson and the deep water well forms a water head, setting a buoyancy tank working platform on the water level in a partition warehouse of the open caisson, hanging a high-pressure ejection water gun and a mud pump below the buoyancy tank platform so that the high-pressure ejection water gun and the mud pump are located in water and on the position of the elevation half of the water head, scouring soil body through high-pressure ejection water to form the mud and discharging outside the open caisson, tunneling the soil body at the bottom of the open caisson and then subsiding under the gravity of the open caisson body. The invention provides a construction method which has the advantages that the devices required for subsiding construction is less, the subsiding efficiency is high, the economical efficiency is good, the construction difficulty of the open caisson is reduced and the efficiency is improved.

Description

technical field [0001] The invention relates to a bridge foundation construction method, in particular to a super large-scale caisson sinking construction method on land. technical background [0002] In recent years, with the rapid development of my country's highway transportation and other infrastructure construction, and the large-scale construction of cross-river and sea-crossing passages, super-long-span bridges with strong spanning capabilities have emerged continuously, and suspension bridges and cable-stayed bridges with the longest spans in the world And arch bridges have sprung up in our country. At the same time, as one of the foundation types of large bridges, caissons, a super-large-scale deep foundation, have been widely used. In long-span bridges such as suspension bridges, caissons are often used in anchorage foundations, main piers and other deep foundations. [0003] The caisson is mainly used in soft soil stratum, sandy soil stratum or alluvial zone with...

AI Technical Summary

Problems solved by technology

The undrained sinking method requires a lot of equipment, the temporary platform support is huge, and the sinking efficiency is low and the economy is relatively poor, which increases the difficulty of caisson construction and reduces efficiency and benefits

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