Steel sheet pile cofferdam supporting and anti-collision conversion structure and construction method

Abstract

The invention discloses a steel sheet pile cofferdam supporting and anti-collision conversion structure and a construction method. A first concrete ring beam, a second concrete ring beam and a third concrete ring beam are poured on backfill sand of a first backfill sand stone layer and backfill sand of a second backfill sand stone layer, sufficient supporting force is provided for a steel sheet pile cofferdam through the strength of the backfill sand, the strength of the first concrete ring beam, the strength of the second concrete ring beam, the strength of the third concrete ring beam and the micro-expansibility of concrete, after a first inner supporting structure, a second inner supporting structure and a third inner supporting structure of the steel sheet pile cofferdam are sequentially detached according to the requirements of a first bearing platform, a second bearing platform and a bridge pier in the poured steel sheet pile cofferdam, and the steel sheet pile cofferdam is safe and reliable; and meanwhile, a clean and flat operation platform is created for subsequent poured bearing platform and bridge pier construction. After a main bridge is opened to traffic or the steel sheet pile cofferdam is detached, the first concrete ring beam, the second concrete ring beam and the third concrete ring beam form an anti-collision conversion ring beam, the anti-collision conversion ring beam is arranged, the situation that ships collide with the bearing platforms and the bridge piers due to misoperation or underwater objects can be effectively prevented, and the good anti-collision defense measure is free of cost input and can achieve a good additional effect.

Description

technical field [0001] The invention relates to the field of cofferdam support, in particular to a steel sheet pile cofferdam support and anti-collision conversion structure and a construction method. Background technique [0002] Steel sheet pile cofferdams are required to construct bridge piers or main bridge caps in rivers. After the steel sheet pile cofferdams are formed, multiple layers of supports must be installed inside the steel sheet pile cofferdams from bottom to top in order to resist the water pressure outside the steel sheet pile cofferdams. The inner support structure composed of columns and I-beams, usually the I-beams of the inner support structure are close to the inner wall of the steel sheet pile cofferdam at the corresponding position on the same floor, and then several support columns are used to support the inner wall of the steel sheet pile cofferdam on both sides of the same floor The inner end faces of the I-beams form the internal support structure...

AI Technical Summary

Problems solved by technology

When designing the steel cofferdam structure, the traditional method of backfilling sand was adopted. After backfilling the sand and removing the inner support structure of the first layer, it was found that the deformation of the bottom of the steel sheet pile cofferdam had exceeded the allowable value of the specification, which seriously endangered the safety of the structure. If a single cofferdam is used to support the support structure, the amount of steel used will increase by about 57t, or the type of steel sheet piles will be increased (the amount of steel used for a single cofferdam will increase by about 118.9t). The amount of steel used is too large, labor-intensive, increases construction costs, and prolongs the construction period; and the layout of the support structures in each layer also affects the construction space of the caps

Similarly, before the construction of pier columns or tower columns after the construction of the second-floor cap, it is also necessary to dismantle the supporting structure located in the second-floor, and still face the same problem

[0003] On the other hand, after the main bridge is completed or opened to traffic, ships often hit the caps and piers due to operational errors or objects in the water, causing damage to the caps and piers, and there are currently no good defense measures for this impact

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