Design method and structure of steel sheet pile cofferdam with bed rock covered with thick pebble bed

Abstract

The invention discloses a design method for a steel sheet pile cofferdam with a thick pebble bed covered on bedrock, which comprises the following steps: designing a steel sheet pile cofferdam construction process, and punching a guide hole through a punching device so as to mount a steel sheet pile; calculating the preset rock-socketed depth of the steel sheet pile; the influence of the guide hole size on the stress performance of the steel sheet pile is analyzed; analyzing the influence of the characteristics of the backfill on the stress performance of the steel sheet pile; and checking the structural stability. A steel sheet pile cofferdam structure with a thick pebble bed covered on bedrock comprises steel sheet piles, multiple layers of ring beams are installed on the inner rings of the steel sheet piles side by side, and inner supporting assemblies are installed on the inner sides of the ring beams. The steel sheet piles are installed after the guide holes are drilled, installation of the steel sheet piles is facilitated, and deformation or local damage cannot be generated in the installation process of the steel sheet piles; the optimal guide hole diameter and the optimal guide hole depth can be determined, the displacement after the steel sheet pile is installed is reduced, the steel sheet pile is installed more stably, the utilization rate of materials is increased, the material cost is saved, and the problem that the built-in stability and the buoyancy resistance of the bottom sealing concrete cannot meet the requirements is solved.

Description

technical field [0001] The invention belongs to the technical field of cofferdam structure construction, and particularly relates to a design method and structure of a cofferdam of steel sheet piles with thick pebble layers overlying bedrock. Background technique [0002] In the construction of large foundation pits, the steel sheet pile cofferdam has the characteristics of good applicability, convenient construction and good effect. It is widely used in the construction of deep foundation pits and bearing platforms in water. However, the ordinary steel sheet pile construction method has certain limitations in the requirements of the use conditions. It is generally suitable for sandy soil, semi-dry clay, and soft fully weathered rock formations. For hard strong and moderately weathered rock formations and large-diameter pebble formations, if the steel sheet pile is directly inserted, it may cause geological problems. The hardness will cause excessive deformation or local d...

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a method and structure for designing a steel sheet pile cofferdam with a thick pebble layer on the bedrock, which is used to solve the problem of relatively hard strong and medium weathered rock formations and large-size pebble formations in the prior art. If the steel sheet pile is inserted directly, it may cause excessive deformation or local damage of the steel sheet pile during the insertion process due to the hard ground, which will affect the waterproof performance and mechanical performance of the steel sheet pile. question

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