Concave curved surface polygonal suction foundation

Abstract

The invention discloses a concave curved-surface polygonal suction foundation, which consists of a curved-surface polygonal top plate and a bent side wall. The lower end of the bent side wall is sharpened to reduce penetration resistance of the bottom of the foundation. Compared with a conventional thin-wall barrel-shaped suction foundation, when the thin-wall barrel-shaped suction foundation bears a horizontal load, the inwards-concave type bent side wall of the thin-wall barrel-shaped suction foundation can transfer more soil mass to participate in bearing, and the effect of resisting transverse displacement of the foundation is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of marine engineering and relates to the basic design and application of offshore structural engineering. Background Art

[0002] Suction foundation mainly uses negative pressure for sinking and installation. It has the characteristics of convenient construction, fast construction speed, low cost and reusability. It is widely used in offshore oil and gas platforms built in China. In 1999, the Chengbei CB20B offshore platform built by Shengli Oilfield used suction foundation; the JZ20-2 oilfield in the South China Sea adopted a single-point mooring suction anchor foundation; the wind tower built in Changyi, Shandong in 2011 used a large-diameter suction foundation. In addition to bearing the gravity of the upper structure, the suction foundation is also subjected to horizontal loads and moment loads from sea breeze, waves, ocean currents, etc. The conventional suction foundation structure cannot realize the function of mobilizing the surrounding soil and providing horizontal resistance. Therefore, it is necessary to explore new structural forms to make the foundation side wall produce soil aggregation effect, thereby generating radial resistance and increasing the foundation's ability to resist horizontal loads. Summary of the invention

[0003] In order to improve the horizontal bearing capacity and bending moment resistance of the marine structure foundation, the present invention proposes a concave curved polygonal suction foundation. The invention improves the conventional cylindrical suction foundation by changing the cross-sectional shape to a hexagonal and octagonal style, in which each side is a concave side. Each concave side curved side wall can mobilize more surrounding soil to participate in the horizontal bearing.

[0004] The present invention adopts the following technical solutions:

[0005] A concave curved polygonal suction foundation is characterized in that it comprises a curved polygonal top plate and a curved side wall. The curved side wall is a rolled steel sheet, and a plurality of curved side wall rolled steel sheets are connected to the curved polygonal top plate by welding.

[0006] In the present invention, the concave curved polygonal suction foundation, the cross-sectional shape of the curved polygonal top plate is a concave hexagon or octagon.

[0007] In the present invention, the bottom of the curved side wall of the concave curved polygonal suction foundation is sharpened. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention is further described in conjunction with the accompanying drawings.

[0009] Figure 1 Front view of the overall structure

[0010] Figure 2 Top view of the curved polygonal top plate

[0011] Figure 3 Side view of the overall structure 1- curved polygonal top plate; 2- curved side wall; 3- base bottom (sharpened); DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] A concave curved polygonal suction foundation is characterized in that it comprises a curved polygonal top plate and a curved side wall. The curved side wall is a rolled steel sheet, and a plurality of curved side wall rolled steel sheets are connected to the curved polygonal top plate by welding.

[0014] In this embodiment, the cross-sectional shape of the curved polygonal top plate is a concave hexagon or octagon, and the bottom of the curved side wall is sharpened to reduce the penetration resistance during the penetration process.

[0015] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A concave curved polygonal suction foundation, characterized in that: The invention comprises two parts: a curved polygonal top plate and a curved side wall. The curved side wall is a rolled steel sheet, and a plurality of curved side wall rolled steel sheets are connected to the curved polygonal top plate by welding.

2. According to the concave curved polygonal suction foundation of claim 1, the cross-sectional shape of the top plate is a concave hexagon or octagon.

3. According to the concave curved polygonal suction foundation of claim 1, the bottom of the curved side wall is sharpened.

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