An Immersion Pipe Operation Method Using Floating Balls to Immerse Pipelines
A technology for pipelines and floating balls, which is applied in pipeline laying and maintenance, pipes/pipe joints/fittings, water resources protection, etc. It can solve problems such as large local shear stress, difficulty in uniform control of lifting force, and influence of hoist pull
Active Publication Date: 2018-09-14
TIANJIN CHENGAN THERMAL POWER CO LTD
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Problems solved by technology
However, this immersed tube sinking construction method has the following disadvantages: (1) it is difficult to uniformly control the lifting force; (2) problems such as large local shear stress have always plagued safe construction; (4) The construction process is complicated and the investment is high
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[0024] Taking DN1000 prefabricated thermal insulation steel pipe immersed pipe crossing a 165-meter-wide river channel as an example, the overall welding of the pipe is completed, and after the pressure meets the design requirements, according to the force analysis results, the gravity of the 95m steel pipe in the water is 121.6KN, and the DN1000*2000 rubber buoy is selected. The ball, in which the floating ball is made of natural rubber and nylon dipped cord fabric, and its design pressure meets the pressure strength of 20 meters underwater. Each pipe is equipped with 5 floating balls, and a floating ball is installed every 15 meters in the horizontal pipe part of the pipe. The floating ball is installed above the pipe with a special fastening belt, and the fastening belt is a braided strap. According to this plan, the total buoyancy can reach 77KN, and the gravity of the remaining 44.6KN is borne by the lifting points at both ends and the positioning lifting point in the midd...
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The invention discloses a pipe immersing operation method for immersing a pipe by using floating balls. The method comprises steps as follows: 1) the multiple floating balls are evenly tied on the pipe; 2) the pipe is transported into a river channel from a welding platform; 3) two ends of the pipe are connected with hanging point ropes of derrick masts on both sides; 4) multiple positioning hanging point boats are evenly arranged on one side of the pipe and are connected onto the pipe by the aid of hanging point ropes; 5) water is injected into the pipe, and meanwhile, the floating balls are symmetrically deflated, so that the pipe is immersed in a preset groove at the river bottom; 6) the pipe is disconnected from the hanging point rope of the derrick mast on the left side, the hanging point rope of the derrick mast on the right side and the hanging point ropes of all the positioning hanging point boats, the preset groove is back filled with fine sand and stone chip cushions, and the river channel is restored. In the process of water injection and immersion of the pipe, the floating balls can be deflated manually at any time until the pipe is immersed in place according to the immersion depth progress and the water injection condition of the pipe, so that the deflection, the bending stress, the shear stress and the immersing speed of all parts of the pipe are controlled actively.
Description
technical field [0001] The invention relates to the field of engineering operation and transportation, in particular to an immersed pipe operation method using floating balls to sink pipes. Background technique [0002] For long and large metal pipes, due to the limitation of large deflection and bending stress, it is difficult to realize the immersed pipe operation. Unless a number of hoisting hoists are used to assist lifting in the middle of the pipeline, the immersed pipe operation can be carried out. However, this immersed tube sinking construction method has the following disadvantages: (1) it is difficult to uniformly control the lifting force; (2) problems such as large local shear stress have always plagued safe construction; (4) The construction process is complicated and the investment is high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an immersed pipe operation method using floating balls to s...
Claims
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IPC IPC(8): F16L1/16
CPCY02A20/402
Inventor 孙继伟赵颖杨亚龙柴玉龙范文强李爽白鹤刘超许茜
Owner TIANJIN CHENGAN THERMAL POWER CO LTD