A design method of cross-sea steel immersed pipe

Abstract

The invention discloses a designing method for a sea-crossing steel sinking pipeline. The designing method for the sea-crossing steel sinking pipeline comprises the following steps: (1) determining the arrangement of a pipeline route according to the terrain of a seabed, wherein the sea-crossing steel sinking pipeline comprises two upwards-bent sections and two downwards-bent sections, which are on the same plane and have the same curvature radius; (2) calculating a design curvature radius: calculating the design curvature radius according to the strength and the stress characteristics of a pipeline material and a specification, and determining the arc lengths of the upwards-bent and downwards-bent sections according to the arrangement of the pipeline route and the design curvature radius; (3) digging a foundation trench matched with the pipeline route in the seabed on the basis of the arrangement of the pipeline route and the design curvature radius; (4) constructing and dragging the pipeline, and ensuring that the curvature radius of the sinking pipeline is equal to the design curvature radius. According to the designing method for the sea-crossing steel sinking pipeline, the shortcomings of a conventional bottom towing method are overcome, and the designing method for the sea-crossing steel sinking pipeline is safer and more suitable.

Description

technical field [0001] The invention belongs to a design method of a sea-crossing steel immersed tube, and in particular relates to a design method of a sea-crossing steel immersed tube with a large diameter and a super aspect ratio. Background technique [0002] Immersed pipe construction method is one of the main construction methods for underwater pipeline construction. It has been continuously improved in recent years. There are mainly surface floating method, pipe-laying ship method and bottom towing method. The more commonly used method is bottom towing method. [0003] The bottom towing method of cross-sea steel immersed pipe is to sink the steel pipe into the foundation bed, drag it along the path of the design elevation, bury the traction ground anchor on the opposite bank or pull the pipe step by step with a winch on the workboat to complete the laying. The bottom towing method is widely used because of its following advantages: (1) It does not need to occupy a lar...

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Problems solved by technology

However, the bottom-drag immersed pipe also has the following disadvantages: (1) long-distance and large-diameter immersed pipes have large frictional resistance, require a large traction force, and have high requirements for traction equipment; (2) the pipe is dragged close to the foundation groove, and The protective layer is easily damaged, or a coating with high wear resistance needs to be used, which increases the difficulty and cost of protection; (3) if the large-diameter steel immersed pipe is provided with rigid elbows at both ends of the bank slope and the seabed slope, it cannot be used to drag Pipe laying, if no rigid elbow is installed, the pipe and the foundation groove will be overhead, which is not conducive to the stability of the pipe and the safety of the structure

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