Construction method for water jet cutter Larsen steel sheet pile

Abstract

The invention discloses a construction method for a water jet cutter Larsen steel sheet pile. The construction method comprises the following construction steps: (1), a total station and a level gauge for Larsen pile construction are checked before construction, and a datum point for staking out in survey is re-checked; (2), surveying and setting out are performed, the planar position and size of a cofferdam are surveyed with the total station according to a resurveyed and approved surveying result, and the surveying perpendicularity is controlled in a piling process of the steel sheet pile for timely deviation correction; (3), a guide frame is mounted according to a construction drawing in a designed position, the guide frame is mainly formed by splicing and welding double 40b I-beams and channels, and a frame-type guide device is formed through connection of 16# channel; and (4), the water jet cutter Larsen steel sheet pile is manufactured. According to the construction method, the water jet cutter Larsen steel sheet pile is adopted to disturb a rigid plastic or hard soil layer of the original pile position and is driven into a hole until design elevation is reached, then the water jet cutter Larsen steel sheet pile is pulled out, a conventional Larsen steel sheet pile is driven in, and construction of the steel sheet pile in the rigid plastic or hard soil layer can be realized smoothly while a lock port of the Larsen steel sheet pile is not damaged.

Description

technical field [0001] The invention relates to the field of foundation pit support, in particular to a construction method of a water-knife Larsen steel sheet pile. Background technique [0002] The construction of Larsen steel sheet piles is mainly used in the support of foundation pits in river courses. It first appeared in coastal areas such as Shanghai in China. Shanghai belongs to the mouth of the Yangtze River, and its soil layers are mostly clay and muddy soil layers. Larsen steel sheet piles are used in Shanghai Only by increasing the power of the vibratory hammer can the area be drilled to the design depth. [0003] With the rise of bridge construction in the province, there are more and more projects using Larsen steel sheet piles as support in the mainland, and the application of Larsen steel sheet piles is also gradually promoted. However, the substratum of the river channel in the province is dominated by plastic clay, and there are mostly hard plastic soi...

AI Technical Summary

Problems solved by technology

It is very difficult to drive ordinary Larsen steel sheet piles in especially hard plastic and hard soil layers. If the power of the vibratory hammer is increased, the lock of the Larsen steel sheet piles will easily be broken, making it impossible to use them for turnover, which will greatly increase the project cost.

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