GB/T 37349-2019 in English

Background and Significance of Standard Formulation

As an important equipment for offshore oil and gas development, the cantilever beam structure of the jack-up drilling platform is a key load-bearing component for drilling operations. The formulation of GB/T 37349—2019 aims to standardize the design requirements of the cantilever beam structure and ensure its safety and reliability in complex marine environments.

As offshore engineering develops deeper and farther, cantilever beam structures need to withstand greater drilling loads and environmental loads. Based on years of engineering practice and technological innovation, this standard provides designers with a scientific design basis and technical guidance.

Design methods and key technologies

1. Structural type selection

Cantilever beam structures are mainly divided into two types: "box type" and "door type". The specific selection should take into account the following factors:

• Main deck space layout requirements of jack-up drilling platform
• Drilling load size and overhang distance requirements
• Cantilever beam sliding system load

2. Structural component classification

According to the stress state and failure consequences, the cantilever beam structure is divided into primary components and secondary components:

• Web plate and face plate of longitudinal I-beam
• Strong crossbeam and ring frame of drilling platform sliding support structure
• Crossbeam and corresponding ring frame of pipe yard platform

• Strengthening materials of longitudinal I-beam
• Upper deck and internal platform structure
• Other auxiliary structures

Design verification and implementation suggestions

1. Design verification requirements

To ensure the reliability of the cantilever beam structure, the design verification should include the following:

• Meet the requirements of the contract technical specification
• Meet the functional and interface requirements of the drilling platform
• Meet the requirements of the classification society's rules
• Comprehensively evaluate the applicability, processability and economy of the structural system

2. Implementation suggestions

Based on the background of standard formulation and the analysis of technological evolution, the following are implementation suggestions in actual projects:

• Give priority to box-type structure: When space and bearing capacity permit, the box-type structure is a better choice. Its closed internal design saves deck space, is easy to operate, and is suitable for complex drilling operations.
• Pay attention to material selection and weld design: The main components of the cantilever beam structure should give priority to high-strength steel, and the nodes and plate seams should be designed strictly in accordance with the requirements of GB/T37347 and GB/T37335 to ensure welding quality.
• Strengthen transverse strength management: For portal structures, setting lateral struts between the deck beams and lateral beams can effectively improve the lateral bearing capacity and reduce the risk of structural deformation.
• Consider the impact of environmental loads: The comprehensive effects of marine environmental loads such as wind, current, and waves should be fully considered in the design, and the impact of cantilever beam deformation on drilling operations should be reduced through reasonable structural layout and optimized design parameters.