A combined loose-drilling method for lattice-type steel sheet piles and large cylinder main lattice sheet piles

Abstract

The invention discloses a combined disperse hitting method for a lattice type steel sheet pile large cylinder main lattice sheet piles. According to the method, vibration sinking is performed on lattice type steel sheet pile large cylinder main lattices in a grouped mode through a single vibration hammer. The aquatic combined disperse hitting technology of a lattice type steel sheet pile large cylinder is suitable for lattice type steel sheet pile diking construction in all land formation projects and especially suitable for applicable to the areas, where a large crane ship cannot enter, such as intertidal zones of which the water is shallow and height limit aviation areas near airports. Land pre-splicing is not affected by on-site conditions, and therefore the method is especially suitable for offshore areas where on-site effective operation time per year is quite short. Meanwhile, because the technology does not need a large-tonnage crane ship of which the tonnage is 2000 t or more, and construction cost is lower.

Description

technical field [0001] The present invention relates to a construction technique of an artificial island on the sea, in particular to a method of splicing 1 / 4 cylinders pre-assembled in the off-site land area into a full circle on site during the construction of a large cylinder of lattice-type steel sheet piles on the sea, and then vibrating and sinking them in place in groups. method. Background technique [0002] Artificial islands are generally artificially built land in shallow waters near the coast. As a place for offshore operations or other purposes, most of them are connected to the shore by trestles or undersea tunnels. In a coastal country with developed modern industry, the dense population and crowded cities along the coast have greatly restricted the further development and construction of new enterprises and public facilities, and the problems of residence, traffic, noise, water and air pollution in the original city itself are also difficult. solve. Therefo...

AI Technical Summary

Problems solved by technology

3) Poor geological conditions make the pile length longer

[0007] In addition to the above-mentioned construction constraints, for the sinking of the large cylindrical main cell of the lattice-type steel sheet pile with a diameter of 31.194m and a length of 37.1m, in conventional technology, a large-tonnage crane ship of 2000t or more is generally required to be equipped with more than 20 sets at the same time. In addition to the various requirements of large-scale equipment on the construction site, this process is very expensive, which will increase the cost of engineering construction.

[0008] At the same time, due to the large cylinder main cell of the lattice-type steel sheet pile with a diameter of 31.194m and a length of 37.1m, its volume and weight are very large, and it is difficult to ensure the verticality of the cylinder after the pile is placed during the overall vibration sinking process.

[0009] Furthermore, during the overall vibration of the large cylinder, the pile top will be uneven due to uneven soil quality.

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