Main chord pipe and design method thereof and pile leg

Abstract

The invention discloses a main chord pipe, a design method of the main chord pipe, a pile leg and a design method for an open-spandrel type main chord pipe by which a solid-web type main chord pipe can be replaced. The main chord pipe comprises a rack plate and semi-chord pipes connected with the rack plate. The rack plate comprises two or more racks and a connection assembly. Each rack comprisesa toothed plate and teeth. The side face, deviating from the teeth, of each toothed plate is the connection face. The connection assembly is connected between the two racks along the width direction of the racks. Thus waste of a tooth-shaped material excised can be effectively saved by the rack structure. In addition, the connection assembly is arranged and connected between the two racks so thatmeshing force coming from the teeth can be conducted, and section rigidity of the rack plate is improved. In this way, by means of the technical scheme of the main chord pipe, saving of materials is achieved, and meanwhile, structural strength of the main chord pipe is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of marine engineering equipment, in particular to a main chord pipe, a design method thereof, and pile legs. Background technique [0002] The legs of the jack-up platform can be divided into truss-type legs and cylindrical legs according to the structure of the legs. Among them, the truss-type legs are a type of legs that are commonly used at present. The truss-type pile legs are mainly composed of welded main chord tubes and horizontal support tubes. The main chord consists of a rack plate and two half chords, such as Figure 1-2 As shown, among them, the rack plate is usually a solid web section, so the rack plate is also called a solid web rack plate. According to the existing production process of the rack plate, three rack plates can be cut at one time, that is, the rack plate used on one leg. Although the production process and cutting layout have been improved, the existence of teeth leads to The tooth-shape...

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the above table 1 that the waste of the rack plate is relatively large, and the utilization rate of the material is about 75%. The rack plate usually adopts a high-strength modulated steel plate with a minimum yield strength of 690MPa. The price of this steel plate is generally in the More than 3,000 US dollars / ton, the material cost is relatively high, and the wasted material greatly increases the material cost of the project

At present, the main dimensions and specifications of the jack-up platform are gradually increasing, and the water depth required to adapt is also increasing. Therefore, the size of the pile legs is also required to increase. In order to lift the ever-increasing weight, the thickness of the rack plate also needs to be increased. Larger, and the material wasted due to the cut tooth material will also increase, resulting in a greater increase in material cost

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