Construction method for crossing bridge pile foundation by combining bridge underpinning with shield construction

Abstract

The invention relates to a construction method for crossing bridge pile foundations by combining bridge underpinning with shield construction, which comprises bridge foundation underpinning construction and shield crossing construction. The bridge foundation underpinning construction method comprises the specific steps of: 1, reinforcement construction for bracing structure of foundation pits and underbridge jet grouting, and 2, underbridge soil excavation and base slab construction; and the shield crossing construction method comprises the specific steps of: 1, piles crossing by direct cutting, and 2, pile removal by explosion. In the method, before the shield crossing construction, a pile foundation of a bridge is underpinned into an enlarged plate type foundation, i.e. a deep foundation of the bridge is converted into a shallow foundation through the conversion of stress systems. After the conversion, all bridge piles which are met by a shield during advancing can be cut and removed without influencing the normal use of the bridge. The bearing capacity of shallow soil in Shanghai is lower so that the soil base below the base plate of the enlarged plate type foundation is obliged to be reinforced and the subsidence deformation of the foundation soil meets the technical standards specified for safety traffic on the bridge.

Description

technical field [0001] The invention relates to a shield construction method, in particular to a shield construction method that needs to cross bridge pile foundations. Background technique [0002] The tunnel in a section of Shanghai Rail Transit Line 10 will pass between the pile foundations of the Shajinggang Bridge on Siping Road, which is normally in use. Before crossing, underpin the foundation of Shajing Port Bridge to ensure the safety of the bridge and ground traffic during the crossing process. [0003] Shajinggang Bridge is located about 100m south of the intersection of Siping Road and Quyang Road. The mileage of the bridge center is SK23+242.0. There is a newly built high-rise on the southwest side of the Shajinggang Bridge, and its corner is 11m away from the sideline of the road. 15.2m south of the bridge and 4.69m away from the sideline of Siping Road is a single-layer Siping pumping station. The southeast side of the bridge is a residential area. On the ...

AI Technical Summary

Problems solved by technology

Therefore, only the construction method of shield crossing bridge piles can be adopted

However, the existing construction method of shield crossing bridge piles cannot meet the requirements of shield crossing, such as Shajing Harbor Bridge, which uses prefabricated reinforced concrete square piles as the foundation, and there are multiple piles at each abutment.

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