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CN-121977111-A - Large sea pipe expansion bend butt joint method

CN121977111ACN 121977111 ACN121977111 ACN 121977111ACN-121977111-A

Abstract

The invention relates to a large-scale sea pipe expansion bend butt joint method, which belongs to the field of sea pipe installation, and comprises the steps of determining the position of a base boat, fixing one end of a base boat traction cable onto an expansion bend flange, fixing the other end of the base boat traction cable onto a base boat traction cable winch, fixing one end of a suction barrel traction cable onto the expansion bend flange, fixing the other end of the suction barrel traction cable onto a suction barrel traction cable winch, sinking a suction barrel, fixing one end of a lifting cable onto the expansion bend flange, connecting the other end of the lifting cable onto a crane, expanding and bending into water, adjusting the relative positions of the expansion bend flange and the fixing flange until the expansion bend flange is adjusted to a proper position, abutting joint is performed, disassembling the base boat traction cable, the suction barrel traction cable and the lifting cable after abutting joint is completed, and adjusting the expansion bend butt joint angle by adding the base boat traction cable and the suction barrel traction cable.

Inventors

  • ZHANG WEI
  • Ye yalong
  • HU HONGBIN
  • JIANG XUEXING
  • ZHOU SHENGBO
  • WANG YONGHUI
  • YU JIAYI

Assignees

  • 交通运输部烟台打捞局

Dates

Publication Date
20260505
Application Date
20260403

Claims (9)

  1. 1. The large sea pipe expansion bend butt joint method is characterized by comprising the following steps, Step S1, determining the position of the bottom-seated ship (2) according to the position of the expansion bend (1) and the position of the fixing flange (71) on the terminal platform (7), wherein the bottom-seated ship (2) is positioned on one side, close to the fixing flange (71), of the terminal platform (7); s2, one end of a bottom-seated ship traction cable (22) is fixed on an expansion bend flange (11) on an expansion bend (1), and the other end of the bottom-seated ship traction cable is fixed on a bottom-seated ship traction cable winch (41) after sequentially passing through a bottom-seated ship guide (21) and a bottom-seated ship traction cable guider (51); S3, one end of a suction barrel traction cable (32) is fixed on an expansion bend flange (11) on an expansion bend (1), and the other end of the suction barrel traction cable is fixed on a suction barrel traction cable winch (42) after sequentially passing through a suction barrel guide (31) and a suction barrel traction cable guider (52); s4, sinking the suction barrel (3) on one side of the terminal platform (7) far away from the fixed flange (71); Step S5, one end of a lifting cable (61) is fixed on an expansion bend flange (11) on the expansion bend (1), the other end of the lifting cable is connected to a crane (6), and the crane (6) is used for gradually placing the expansion bend (1) into water near the fixed flange (71); S6, respectively winding and unwinding a pulling cable winch (41) of the bottom-sitting ship and a pulling cable winch (42) of the suction drum to adjust the relative positions of the expansion bending flange (11) and the fixed flange (71), and winding and unwinding a crane lifting cable (61) of the crane (6) to adjust the relative heights of the expansion bending flange (11) and the fixed flange (71) until the expansion bending flange (11) is adjusted to a proper position and then the expansion bending flange (11) is butted with the fixed flange (71); and S7, after the butt joint is completed, disassembling the bottom-seated ship traction cable (22), the suction barrel traction cable (32) and the lifting cable (61) which are fixed on the expansion bend flange (11), and recovering the bottom-seated ship traction cable winch (41), the suction barrel traction cable winch (42) and the lifting machine (6) respectively, wherein the suction barrel (3) is recovered through the lifting machine (6).
  2. 2. The large sea pipe expansion bend butt joint method according to claim 1, wherein the positions of the bottom seat ship (2) and the suction barrel (3) are determined according to the field condition, but the two are respectively positioned at two sides of the fixed flange (71).
  3. 3. A large sea pipe expansion bend butt joint method according to claim 1, wherein the bottom seat ship guiding (21) is higher than the horizontal line where the highest point of the fixing flange (71) is located.
  4. 4. The method for butt-jointing large sea pipes by expansion bend according to claim 1, wherein the suction barrel (3) in the step S4 is submerged, and the height of the suction barrel guide (31) on the suction barrel (3) is ensured to be lower than the lowest point of the fixed flange (71).
  5. 5. The large sea pipe expansion bend butt joint method according to claim 1, wherein the bottom-seated ship traction cable guide (51) and the suction barrel traction cable guide (52) are three-roller cable guides.
  6. 6. The method for butt-jointing large sea pipes by expansion bend according to claim 1, wherein the suction barrel guide (31) is a guide ring or a guide wheel.
  7. 7. A large sea pipe expansion bend butt joint method according to claim 1, wherein the suction barrel guide (31) is welded at the central position of the upper end face of the suction barrel (3) before the step S1.
  8. 8. A large sea pipe expansion bend butt joint method according to claim 1, wherein the bottom-seated ship guide (21) is a guide ring or a guide wheel.
  9. 9. A large sea pipe expansion bend butt joint method according to claim 1, wherein the bottom seat ship guide (21) is welded and fixed at the side position of the bottom seat ship (2) before the step S1.

Description

Large sea pipe expansion bend butt joint method Technical Field The invention relates to a large-scale sea pipe expansion bend butt joint method, and belongs to the field of sea pipe installation. Background Petroleum, one of the most important energy sources worldwide, occupies a central position in the global energy pattern and is known as "industrial blood". With the increase of the difficulty of land oil exploitation, the attention of world countries to offshore oil exploitation with larger storage capacity is getting higher. Submarine pipelines are often selected for transportation after offshore oil exploitation, wherein expansion bends are used as core key components for absorbing thermal expansion and contraction of the pipelines and relieving stress deformation caused by ocean environmental loads such as ocean currents, waves or submarine subsidence, and the installation and butt joint quality directly determines the long-term safe operation stability and the service life of a submarine pipeline system, so that the submarine pipeline is an indispensable important component in submarine pipeline laying engineering. The butt joint construction of the expansion bend is a core procedure in the whole sea pipe laying process, and is also one of links with highest technical difficulty and greatest construction risk. The large sea pipe expansion bend has the structural characteristics of huge size, huge weight and extremely strong rigidity, the butt joint process is not simple linear splicing, but accurate alignment of multiple directions and high precision in a three-dimensional space is needed, and the problems of strict adjustment precision requirement and complicated control of direction dimension are core bottlenecks for limiting the butt joint construction efficiency, construction risk and butt joint quality in the prior art. In the traditional sea pipe expansion bend butt joint method, the expansion bend is mainly adjusted by adopting a crane lifting cable, a plurality of remarkable defects exist in the adjustment mode, the butt joint requirement of the large sea pipe expansion bend is difficult to meet, firstly, the adjustment precision is extremely low, the crane lifting cable can only realize rough lifting or translation adjustment, the circumferential torsion angle and the radial fine deviation of the expansion bend cannot be accurately controlled, the millimeter precision standard required by butt joint is difficult to be achieved, the alignment deviation is extremely easy to exceed an allowable threshold value, secondly, the adjustment dimension is single and mutually interferes, the adjustment action of the crane lifting cable is concentrated on vertical lifting and horizontal rough movement, the phenomenon of axial, radial and circumferential multi-dimensional synchronous adjustment in a three-dimensional space cannot be realized, the phenomenon of pulling and moving the whole body in the adjustment process easily occurs, the ocean deviation in other directions is further aggravated, thirdly, the adjustment stability is extremely poor, the influence of the rigidity of the crane lifting cable and the disturbance of wave in the environment is easy to generate shaking or swinging, the stable positioning of the expansion bend cannot be realized, therefore, the adjustment of the expansion bend is easy to occur in the adjustment process, the inertia is greatly reduced due to the repeated adjustment of the inertia, and the expansion bend is designed, and the expansion bend is greatly designed. Disclosure of Invention The invention provides a large sea pipe expansion bend butt joint method aiming at the defects in the prior art. The technical proposal of the invention for solving the technical problems is that the large sea pipe expansion bend butt joint method comprises the following steps, Step S1, determining the position of the bottom-seated ship according to the position of the expansion bend and the position of the fixing flange on the terminal platform, wherein the bottom-seated ship is positioned on one side of the terminal platform, which is close to the fixing flange; S2, one end of a bottom-sitting ship traction cable is fixed to an expansion bend flange on an expansion bend, and the other end of the bottom-sitting ship traction cable is sequentially guided by a bottom-sitting ship and then fixed to a bottom-sitting ship traction cable winch through a bottom-sitting ship traction cable guider; s3, one end of a suction barrel traction cable is fixed to an expansion bend flange on an expansion bend, and the other end of the suction barrel traction cable is fixed to a suction barrel traction cable winch after sequentially passing through a suction barrel guide and a suction barrel traction cable guider; s4, sinking the suction barrel on one side of the terminal platform far away from the fixed flange; s5, fixing one end of the lifting cable to an expansion bend flange on the expansion bend,