WO2019015260A1

WO2019015260A1 - Construction process of lower assembly of offshore voltage booster substation

Info

Publication number: WO2019015260A1
Application number: PCT/CN2017/119682
Authority: WO
Inventors: 朱军; 胡静波
Original assignee: 南通蓝岛海洋工程有限公司
Priority date: 2017-07-17
Filing date: 2017-12-29
Publication date: 2019-01-24
Also published as: CN107470860A; CN107470860B

Abstract

A construction process of a lower assembly of an offshore voltage booster substation, the process comprising the following steps: (1) performing, according to a nesting drawing, a blanking operation on a steel sheet; (2) marking lines, and cutting grooves; (3) fabricating steel tube piles (1), transverse support rods, and diagonal support rods (5); and (4) joining and welding the steel tube piles (1), transverse support rods, and diagonal support rods (5). By horizontally constructing each section and then joining and welding the same vertically, the construction process is performed in an orderly manner to improve the construction efficiency and enable the lower assembly to provide stable support, thus facilitating long-term operation maintenances of an offshore voltage booster substation. The steel tube pile (1) comprises a vertical portion and an inclined portion inclined toward an inner side, thus greatly improving support provided by the lower assembly, and lowering the possibility of tilting. The present invention has high requirements for rolling and cutting operations, and employs submerged arc welding to provide stable welding quality and high welding production efficiency with no arc light and little fumes and dust. In addition, a reasonable welding allowance is employed to ensure welding quality and precision, thus significantly improving support provided by the lower assembly, and providing stability to the whole offshore voltage booster substation.

Description

Construction process of a lower component of offshore booster station

Technical field

The invention belongs to the field of marine transportation manufacturing, and particularly relates to a construction process of a lower component of an offshore booster station.

Background technique

With the huge consumption of fossil energy and serious pollution of the environment, renewable energy has received more and more attention from all over the world. Wind energy has become one of the most competitive new energy sources. Compared with onshore wind power, offshore wind power is not only not Occupying land resources, and rich in energy, stable output, and high utilization rate, has become a new direction for the development of wind power in the world. At present, most of the offshore wind power under construction in China is 10-30km offshore. The planned capacity of the project is 200-300kw. It is powered by several 3mw-6mw offshore wind turbines. It is concentrated and sent to the offshore booster station through the submarine cable collecting section. After the main transformer of the offshore booster station is boosted and sent to the onshore substation to complete the power transmission, the offshore booster station becomes one of the vital links for offshore wind power generation.

The lower component plays a supporting role for the entire offshore booster station. Therefore, the requirements for the rounding, cutting, welding, fabrication and closing of the lower components are very strict. When the lower components of the conventional offshore booster station are built, the following disadvantages exist: Due to the large structure of the lower components, the overall construction of the lower components is relatively difficult, time-consuming and labor-intensive, the steps are complicated and messy, and the requirements for winding and cutting are low during construction, the welding is unstable, and the welding quality is poor, which greatly weakens. The connection accuracy and support of the lower components bring some instability to the entire offshore booster station.

Summary of the invention

The object of the present invention is to provide a process for constructing a lower assembly of an offshore booster station with an orderly process, high manufacturing precision, high construction efficiency, and improved stability.

In order to solve the above technical problem, the technical solution adopted by the present invention is: a construction process of a lower component of an offshore booster station, the lower component is a jacket that is vertically disposed and whose lower end extends to a bearing layer below the seabed, and the jacket The utility model comprises a plurality of steel pipe piles, wherein the steel pipe pile comprises a vertical portion and an inclined portion, the lower end of the inclined portion is connected with the upper end of the vertical portion, and the upper end of the inclined portion is inclined inwardly, and the inclined portions of the plurality of steel pipe piles are sequentially Corresponding arrangement, at the same time, between the upper end position of the adjacent inclined portion, between the middle position and the lower end position, respectively, a first horizontal strut, a second cross strut, and a third cross strut are arranged between the adjacent inclined portions There are two diagonal struts arranged in a cross, the center of the diagonal struts is connected with the center of the second horizontal struts, and a platform is arranged between the upper ends of the plurality of inclined portions, the platform is placed above the first horizontal struts At the same time, the outer ring of the platform is respectively provided with a fence, and the upper end of the inclined portion of any steel pipe pile is provided with a ladder vertically arranged by the book;

The construction process of the lower component of the offshore boosting station is firstly divided into horizontally constructed and then vertically closed and welded. The steps are as follows: (1) the steel plate is cut according to the nesting drawing; (2) the scribing and the bevel cutting (3) making steel pipe piles, transverse strut and diagonal strut; (4) closing welded steel pipe piles, transverse strut, and diagonal strut.

Further, the specific steps are as follows:

(1) Steel plate according to the nesting material cutting: according to the nesting material cutting, carefully check the cutting diagram and cutting instruction program before cutting to avoid cutting errors, record in the cutting process, check each steel plate to check the steel plate furnace Batch number, make a record, and each part that has been cut must be marked accordingly. Do not repeat the cutting. The cut sheets and residual materials should be stacked in a reasonable batch;

(2) Scribing and bevel cutting: The scribing of the cross-supporting pipe and the diagonal strut of the jacket is very important. The important scribing must be generated by the computer cutting instruction program, and the marking is sprayed when cutting the material, including The upper and lower longitudinal division test lines for the inner and outer cylinders of the support pipe for cutting the groove and the upper and lower longitudinal division test lines for the inspection size, and the detection points and the cutting points are determined. For all the inspection lines and key points, it is necessary to mark with the oceanic punch; The detailed information in the nesting drawing and the construction drawing correctly cut the welding groove, the intersecting line of the diagonal supporting pipe and the groove are to be manually cut after the cylinder is spliced;

(3) Making steel pipe piles, transverse strut and diagonal strut: Firstly, according to the drawings provided by the design department, check and familiarize with the processing parameters of each plate. After processing, control the processing dimensions of each plate. Each has a machining allowance of 100 mm; secondly, according to the diameter of the steel pipe pile, the transverse strut, the diagonal strut, and the wall thickness, the roll is made, and the rolling is positioned on the coiling machine once; , welding the welded joint between the steel pipe pile, the transverse strut and the diagonal strut; after the welding is completed, checking the roundness of the steel pipe pile, the transverse strut and the diagonal strut;

(4) Close the welded steel pipe pile, the transverse strut, the diagonal strut: after positioning the steel pipe pile, respectively hoist the horizontal strut and the diagonal strut, and then sling the horizontal strut and the diagonal strut after the lifting; The middle amount of the rod is positioned by the circumferential seam welding with the middle position of the horizontal strut; the submerged arc is automatically welded when welding the steel pipe pile and the transverse strut, and the weld bead is cleaned before welding, and the cylinder is first welded The inner side is welded, and the outer carbon is used to clear the root and cover surface. When positioning, the two longitudinal slats on the adjacent cylinder are staggered 90° up and down, and the transverse annular joint has at least 50 mm weld overlap, at the beginning and end regions. The weld reinforcement shall not exceed 3 mm.

The beneficial effects of the present invention are as follows:

1. When constructing the lower component of the invention, the first component is firstly horizontally constructed and then vertically closed and welded, and the construction process is organized and orderly, thereby greatly improving the construction efficiency, and the jacket of the lower component passes through the steel pipe pile, the first transverse strut, The arrangement of the second cross strut, the third cross strut and the diagonal strut ensures the stability of the support of the lower assembly, thereby ensuring long-term operation and maintenance of the offshore booster station, and the steel pipe pile includes the vertical portion and the inward slope The inclined portion greatly improves the supportability of the lower component and is less prone to tilting.

2. The lower part of the assembly includes the steps of cutting the steel sheet according to the nesting drawing, cutting the groove, making the steel pipe pile and the transverse strut, and the diagonal strut, closing the welded steel pipe pile and the horizontal strut first-level diagonal strut. It has high requirements for coiling and cutting, and adopts submerged arc welding. The welding quality is stable, the welding productivity is high, there is no arc, and the smoke is less. The welding allowance is reasonably reserved to ensure the welding quality and welding precision, and the support of the lower components is greatly improved. Sexuality brings certain stability to the entire offshore booster station.

DRAWINGS

1 is a schematic structural view of a lower assembly of a construction process of a lower assembly of an offshore booster station according to the present invention.

Detailed ways

The embodiments of the present invention are described below by way of specific embodiments, and those skilled in the art can readily understand other advantages and functions of the present invention from the disclosure.

As shown in FIG. 1, a construction process of a lower assembly of an offshore booster station, the lower assembly being a jacket disposed vertically and having a lower end extending to a bearing layer below the seabed, the jacket comprising a plurality of steel a pipe pile, the steel pipe pile includes a vertical portion and an inclined portion, the lower end of the inclined portion is connected to the upper end of the vertical portion, and the upper end of the inclined portion is inclined inwardly, and the inclined portions of the plurality of steel pipe piles are sequentially Corresponding arrangement, at the same time, between the upper end position of the adjacent inclined portion, between the middle position and the lower end position, respectively, a first horizontal strut, a second cross strut, and a third cross strut are arranged between the adjacent inclined portions There are two diagonal struts arranged in a cross, the center of the diagonal struts is connected with the center of the second transverse struts, and a platform is arranged between the upper ends of the plurality of inclined portions, the platform is placed on the first transverse struts In the upper position, the outer ring of the platform is respectively provided with a fence, and the upper end of the inclined portion of any steel pipe pile is provided with a ladder vertically arranged;

The specific steps are as follows:

When constructing the lower component of the invention, the first component is firstly horizontally constructed and then vertically closed and welded, the construction process is organized and orderly, and the construction efficiency is greatly improved. The jacket of the lower component passes through the steel pipe pile, the first transverse strut, and the second The arrangement of the transverse strut, the third cross strut and the diagonal strut ensures the stability of the support of the lower assembly, thereby ensuring the long-term operation and maintenance of the offshore booster station, and the steel pipe pile includes the vertical portion and the inclination inclined inward. The department greatly improves the support of the lower components and is less prone to tilting.

The lower part of the assembly includes the steps of cutting the steel sheet according to the nesting drawing, cutting the groove, making the steel pipe pile and the transverse strut, and the diagonal strut, closing the welded steel pipe pile and the horizontal strut first-level diagonal strut, etc. The coiling and cutting requirements are high, and the submerged arc welding is adopted. The welding quality is stable, the welding productivity is high, there is no arc, and the smoke is less; the welding allowance is reasonably reserved to ensure the welding quality and the welding precision, and the supportability of the lower component is greatly improved. It brings certain stability to the entire offshore booster station.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention. Any technical solutions that can be implemented on the basis of the above embodiments without creative work should be considered as falling into the present invention. The scope of protection of rights.

Claims

A construction process for a lower assembly of an offshore booster station, characterized in that the lower assembly is a jacket that is vertically disposed and whose lower end extends to a bearing layer below the seabed, the jacket comprising a plurality of steel pipe piles The steel pipe pile includes a vertical portion and an inclined portion, and a lower end of the inclined portion is connected to an upper end of the vertical portion, and an upper end of the inclined portion is inclined inwardly, and the inclined portions of the plurality of steel pipe piles are sequentially arranged correspondingly At the same time, a first horizontal strut, a second transverse strut, and a third transverse strut are respectively disposed between the upper end positions of the adjacent inclined portions, between the middle positions, and the lower end positions, and are disposed between the adjacent inclined portions. Two diagonal struts arranged in a cross, the center of the diagonal struts is connected to the center of the second transverse struts, and a platform is arranged between the upper ends of the plurality of inclined portions, the platform is placed above the first horizontal struts At the same time, the outer ring of the platform is respectively provided with a fence, and the upper end of the inclined portion of any steel pipe pile is provided with a ladder vertically arranged by the book;

The construction process of the lower component of the offshore boosting station is firstly divided into horizontally constructed and then vertically closed and welded. The steps are as follows: (1) the steel plate is cut according to the nesting drawing; (2) the scribing and the bevel cutting (3) making steel pipe piles, transverse strut and diagonal strut; (4) closing welded steel pipe piles, transverse strut, and diagonal strut.
A construction process for a lower assembly of an offshore booster station according to claim 1, wherein the specific steps are as follows:

(1) Steel plate according to the nesting material cutting: according to the nesting material cutting, carefully check the cutting diagram and cutting instruction program before cutting to avoid cutting errors, record in the cutting process, check each steel plate to check the steel plate furnace Batch number, make a record, and each part that has been cut must be marked accordingly. Do not repeat the cutting. The cut sheets and residual materials should be stacked in a reasonable batch;

(2) Scribing and bevel cutting: The scribing of the cross-supporting pipe and the diagonal strut of the jacket is very important. The important scribing must be generated by the computer cutting instruction program, and the marking is sprayed when cutting the material, including The upper and lower longitudinal division test lines for the inner and outer cylinders of the support pipe for cutting the groove and the upper and lower longitudinal division test lines for the inspection size, and the detection points and the cutting points are determined. For all the inspection lines and key points, it is necessary to mark with the oceanic punch; The detailed information in the nesting drawing and the construction drawing correctly cut the welding groove, the intersecting line of the diagonal supporting pipe and the groove are to be manually cut after the cylinder is spliced;

(3) Making steel pipe piles, transverse strut and diagonal strut: Firstly, according to the drawings provided by the design department, check and familiarize with the processing parameters of each plate. After processing, control the processing dimensions of each plate. Each has a machining allowance of 100 mm; secondly, according to the diameter of the steel pipe pile, the transverse strut, the diagonal strut, and the wall thickness, the roll is made, and the rolling is positioned on the coiling machine once; , welding the welded joint between the steel pipe pile, the transverse strut and the diagonal strut; after the welding is completed, checking the roundness of the steel pipe pile, the transverse strut and the diagonal strut;

(4) Close the welded steel pipe pile, the transverse strut, the diagonal strut: after positioning the steel pipe pile, respectively hoist the horizontal strut and the diagonal strut, and then sling the horizontal strut and the diagonal strut after the lifting; The middle amount of the rod is positioned by the circumferential seam welding with the middle position of the horizontal strut; the submerged arc is automatically welded when welding the steel pipe pile and the transverse strut, and the weld bead is cleaned before welding, and the cylinder is first welded The inner side is welded, and the outer carbon is used to clear the root and cover surface. When positioning, the two longitudinal slats on the adjacent cylinder are staggered 90° up and down, and the transverse annular joint has at least 50 mm weld overlap, at the beginning and end regions. The weld reinforcement shall not exceed 3 mm.