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Semi-floatation-condition work method for offshore self-elevating type work platform

A working platform and self-elevating technology, applied to artificial islands, underwater structures, ships, etc., can solve problems such as inability to perform operations

Active Publication Date: 2017-09-08
HUADIAN HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the operation cannot be carried out in a poor sea condition environment, the present invention proposes a semi-floating operation method for an offshore self-elevating operation platform, comprising the following steps:

Method used

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  • Semi-floatation-condition work method for offshore self-elevating type work platform
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  • Semi-floatation-condition work method for offshore self-elevating type work platform

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Embodiment 1

[0040] In order to ensure that the pile leg load is reduced and the stability of the platform is ensured during construction in a semi-floating state, the present invention proposes a semi-floating operation method for an offshore self-elevating operation platform, such as figure 1 shown, including the following steps:

[0041] S110 determines the semi-floating operation condition, draws the leg load curve of the semi-floating operation according to the draft-buoyancy curve in the tidal table of the location of the operation item and the stability calculation report, and determines the draft upper limit Dh and The lower limit of draft Dl;

[0042] S120, according to the weather change trend and tide change trend, combined with the leg load curve of the semi-floating state operation, formulate a lifting plan for the semi-floating state operation hull, so as to maintain the draft between the upper draft limit and the lower draft limit;

[0043] S130 carries out the ship lifting...

Embodiment 2

[0058] When the working method of the present invention is being constructed, it needs preliminary check and data preparation work, including

[0059] 1. Calculation of ultimate bearing capacity of pile leg foundation

[0060] According to the engineering geological data and specific conditions of the operation area provided, pile insertion calculations are carried out for the hoisting position. If the soil bearing layer is deep and the surface soil is too soft to support the complete lifting operation of the jack-up ship, then it can be considered Semi-floating hoisting construction operations. In the soil layer within the reachable depth of the pile legs of the jack-up installation ship, the spud cans are selected to be inserted into the bearing layer, and the corresponding ultimate bearing capacity of the foundation Qs, the depth L of the pile legs, the pile pullout force and the stability against slippage are calculated. sex.

[0061] 2. Calculation of anti-skid force

...

Embodiment 3

[0116] In order to reduce the load of the legs and ensure the stability of the platform during construction in the semi-floating state, the draft is automatically adjusted, such as Figure 9 As shown, an offshore self-elevating operation platform 100 for semi-floating operations that can automatically adjust the draft is proposed, including a platform main body 110 and a pile that is arranged on the platform main body 110 and can be raised and lowered relative to the platform main body 110 Legs 120, a lifting device 130 arranged on the platform main body 110 for driving the lifting of the legs 120; also includes a pressure sensor 140 arranged on the unloaded baseline of the platform main body 110 and connected to the pressure sensor 140 The controller 150 is also connected to the lifting device 130 . A sinking pad 160 is also connected to the bottom of the pile leg 120, and the sinking pad 160 acts on the mud layer. The controller receives the pressure information read by the...

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Abstract

The invention relates to a semi-floatation-condition work method for an offshore self-elevating type work platform. The semi-flotation condition work method includes the following steps that semi-floatation-condition work conditions are determined, a semi-floatation-condition work pile leg loading curve is mapped according to a tidal table of the location of a work project and a draught-buoyancy curve chart in a stability calculation report, and the draught upper limit Dh and the draught lower limit Dl under the semi-floatation-condition work lifting condition are determined; a semi-floatation-condition work ship body lifting plan is scheduled according to the weather change trend and the tidal water change trend and with the combination of the semi-floatation-condition work pile leg load curve, and the draught can be maintained between the draught upper limit and the draught lower limit; ship lifting work is conducted, and leveling and prepressing can be conducted at the center position between the draught upper limit and the draught lower limit; and lifting work is conducted, wherein the lifting and ship body lifting construction work sequence is arranged, a ship body is lifted so that the draught of the ship body can be maintained between the draught upper limit and the draught lower limit, and it is ensured that the pressure of a pile leg over the ground is in the allowed range. Platform environment loads of various time points of tidal changing are taken into consideration.

Description

technical field [0001] The field of the offshore operation platform of the present invention, in particular, relates to a semi-floating operation method of an offshore self-elevating operation platform. Background technique [0002] As the global energy shortage, environmental pollution and other problems are becoming more and more serious, wind energy, as a non-polluting renewable energy, has the fastest development. Since Denmark built the first offshore wind farm in Vindeby in 1991, offshore wind power has become a highlight of new energy development in the world. [0003] The construction of offshore wind farms involves the preliminary marine soil environment measurement, the construction of wind turbine foundation, the transportation of wind turbines, the laying of hoisting cables, and the layout and construction of offshore substations. All aspects of the construction of offshore wind farms require the assistance of offshore engineering cranes and work boats. In the ...

Claims

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Application Information

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IPC IPC(8): E02B17/00E02B17/02B63B35/00
CPCB63B35/00E02B17/00E02B17/021E02B2017/0047E02B2017/0056
Inventor 袁新勇张健翔王小合郝利忠赵迎九逯鹏张星波马春龙王怀明董孟永田利勇余刚赵辉杨吉庆
Owner HUADIAN HEAVY IND CO LTD
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