Study on Clamping Mechanism of Internal and External Variable Diameter Lifting Tool for Offshore Foundation Pile

Zhuo Wang,Bo Zhang,Tao Wang,Zhuang Li

doi:10.3390/machines9010019

Zhuo Wang, Bo Zhang + Show 2 more

Open Access

https://doi.org/10.3390/machines9010019

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Abstract

Large marine foundation piles are an important part of offshore structural pile foundations, and their lifting operations have always been a major problem in the construction and construction of marine structures. Based on IHC’s bilateral marine foundation pile spreader, this paper proposes a structural scheme of “internal and external clamping type variable diameter marine foundation pile spreader”. It solves the problem of poor adaptability of spreaders to foundation piles of the same specification and different pipe diameters. At the same time, this article has conducted in-depth research on the two clamping methods of friction clamping and wedge tooth embedded clamping. Through experiments, it is found that under the same lateral load, the load capacity of the wedge teeth tightening is three times that of the friction clamping. Aiming at the embedding and clamping method of the wedge teeth of the spreader, first of all, the influence of the tooth profile angle of the wedge teeth on their embedding performance was studied by the plastic mechanics slip line field theory and Abaqus simulation analysis. Subsequently, the elastic mechanics theory and Abaqus simulation analysis were used to study the stress characteristics of the wedge teeth during the lifting process, and the internal stress distribution was obtained. The article aims to provide a reference for the design of spreaders in actual projects.

Highlights

In offshore waters, pile foundations are a common form of foundation for offshore structures
Steel piles driven into the seabed as supporting members of pile foundation are often referred to as offshore foundation piles
In order to ensure the overall strength of the foundation pile and maintain good mechanical properties and stability during piling, avoid stress concentration and buckling deformation, the outer surface of the foundation pile is always designed as a smooth cylindrical surface, meaning that there is often no ideal lifting point on the surface, which brings technical difficulties to the lifting and handling of the foundation pile [2]

Summary

Introduction

Pile foundations are a common form of foundation for offshore structures. This paper mainly studies the force and deformation of foundation pile under the action of hanger clamping, which belongs to the field of static solution of thin shell structure. Force, [T10h4eNe]xperimental results show that under 3.0 T lateral clamping load, the maximum static friction coef0fi.c5ient of the friction clamp−in27g mode is 0−.12823, while t−h2e5equivalen−t1f3riction coefficient of the 1w.0edge insertion clamping−4m9ode is 0.6−6372, which is−a3p9proximate−l2y2 three times the relations1h.5ip between them This sh−o7w2 s that alth−4o3ugh wedge−4t8eeth are em−3b6edded in a small depth2, .0they have a strong bear−i8n7g capacity−.65The reliab−i5li6ty of wed−g4e1 teeth embedded clamp2i.n5 g mode is verified, an−d10t1he carryin−g82capacity o−6f5the two c−la5m3 ping modes of hanger 3is.0quantitatively compare−d1a17nd analyz−e9d8.

Design Items

Conclusions