Jacket platform

Abstract

The invention discloses a jacket platform. The jacket platform is mainly suitable for shallow water leg inner piles and comprises a jacket and steel piles, wherein the steel piles are downwards inserted into jacket legs of the jacket and fixed to a seabed; the jacket platform further comprises crown plates and gap plates, the crown plates are connected to the outer walls of the steel piles in a sleeving mode, the bottoms of the crown plates are fixed to the top ends of the jacket legs to connect the jacket legs and the steel piles into a whole, and then environmental loads borne by the jacketand dead weight are transmitted to the steel piles; the gap plates are arranged between the inner walls of the jacket legs and the outer walls of the steel piles, the plurality of gap plates are arranged surrounding the steel piles at intervals and are fixed to the inner walls of the jacket legs. Furthermore, when the jacket platform is in a working state, the loads between the jacket and the steel piles are transmitted, the design that the loads of the jacket are transmitted to the steel piles through the crown plates and the gap plates and finally transmitted to pile foundations fully utilizes the strength of the jacket legs, the steel piles and the crown plates, due to the fact that grouting is not needed, the defects of a traditional grouting scheme are avoided, and meanwhile, the construction period and the construction cost can be greatly saved.

Description

technical field [0001] The invention relates to the field of jacket platforms suitable for inner piles of shallow water legs, and is a jacket platform that does not need grouting between pile legs. Background technique [0002] At present, the conventional shallow water leg inner pile jacket platform adopts the grouting scheme between the conduit leg and the steel pile. The conduit leg and the steel pile form a combined interface through grouting to jointly bear the vertical load of the platform and the horizontal environmental force, environmental load Generally, it includes wind load, wave current load, ice load, etc. [0003] The solution of grouting between the conduit leg and the steel pile will have the following problems: [0004] (1) The jacket grouting design scheme requires the design of the grouting system, which increases the design and construction costs of the grouting system and increases the workload of underwater cutting of the grouting pipeline after grout...

AI Technical Summary

Problems solved by technology

[0004] (1) The jacket grouting design scheme requires the design of the grouting system, which increases the design and construction costs of the grouting system and increases the workload of underwater cutting of the grouting pipeline after grouting

[0005] (2) The jacket grouting design scheme increases the material cost of the cement slurry, the shipping cost, and the floating crane workload caused by the grouting operation

[0006] (3) Jacket grouting design requires the use of packers, which are consumables and cannot be recycled, which increases the cost of purchasing, constructing and installing the equipment

[0007] (4) The jacket grouting design scheme often has a large strength margin for the conduit legs and steel piles, and fails to make full use of the strength of the conduit legs and steel piles. Since the jacket is controlled by the construction design or structural requirements, it cannot be infinitely optimized Therefore, the grouting jacket design scheme cannot solve the problem of large design margins for the strength of the conduit legs and steel piles

[0008] (5) In the conventional jacket grouting design scheme, the load transmitted by the cement slurry between the pile legs is not actually considered, but the conduit legs are shared at the top of the conduit legs with variable cross-section (transition of the steel pile to the composite cross-section of the conduit leg and the steel pile). The load of the jacket is used as the design basis, and the strength design margin of the jacket is relatively large

[0010] (7) The jacket grouting design scheme has the risk of slurry leaking and polluting the marine environment. On the one hand, the reason is that the packer equipment may fail. If the packer fails, the slurry will leak from the bottom of the conduit leg; on the other hand, the cement slurry There is also the possibility of overflow from the top of the conduit legs if the handling is not good at the top after filling

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