Caisson towing method

Inactive Publication Date: 2014-11-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of towing technology has made the transportation of marine engineering structures easier, but since the caisson is like a box with a bottom and no cover, its stability during towing is difficult to guarantee; the draft in the basic towing process is large, The requirements for the operation of towing ships are also increasing

Method used

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Examples

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Embodiment Construction

[0019] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0020] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0021] The caisson is the foundation of the liquefied natural gas (LNG) storage tank, with a length of 79.6m, a width of 45m, and a height of 40m; figure 1 As shown, by arranging 10 steel transverse skirts 3 (5m high) and 5 steel longitudinal skirts 4 (5m high) at the bottom of the caisson 1, 36 compartments are formed on the bottom 5 of the caisson 1. The bottom plate 5 of the caisson 1 is provided with a valve 6 at the corresponding position of each cabin, and the valve 6 is connected with the air pump, and the air pump is used to inflate the cabin during the towing process, such as figure 2 shown. Using the air floatation towing method, the steps are as follows:

[0022] (1) After the above skirted caisson is built in the...

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Abstract

The invention discloses a caisson towing method. The caisson towing method includes the following steps that (1) after a caisson is manufactured in a dock, a plurality of longitudinal apron boards and a plurality of transverse apron boards are arranged at the bottom of the caisson, and are intercrossed to form a plurality of cabins; (2) water is injected to the dock until the water level is flush with the water level outside the dock, then a gate is opened, and a towing boat is connected with the caisson; (3) the cabins are inflated, so that the caisson floats, the towing boat tows the caisson to a sinking point, the cabins are deflated, then the caisson sinks, and towing of the caisson is finished. The caisson towing method effectively reduces the number of transportation machines used in the process and accidents caused by improper design and operation in the transportation process. The caisson lifts and floats by inflating the cabins, then the depth of immersion can be reduced in the towing process of the caisson, and therefore towing force is reduced, and towing safety can be ensured conveniently in shallow waters.

Description

technical field [0001] The invention relates to a method for towing a caisson of an offshore liquefied natural gas storage tank, belonging to the field of liquefied natural gas storage. Background technique [0002] With the acceleration of marine development in recent years, caissons are widely used in port walls, piers, breakwaters, offshore liquefied natural gas (LNG) receiving terminal platforms, etc. due to their simple structure, convenient construction, and large available space. in the structure. [0003] The traditional caisson transportation method is to move the caisson prefabricated in the prefabrication plant horizontally and vertically with a trolley, then use a crane to lift the caisson to the barge, transport it to the construction site by barge, and then use the crane to lift it on site. The traditional caisson transportation method is only suitable for small caissons. During the lifting process of the crane ship, the design of the lifting point and the lif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D23/02
Inventor 陈峰彭延建屈长龙毕晓星张超肖立王沛
Owner CHINA NAT OFFSHORE OIL CORP
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