CN110576939A - Construction method for large conical cylinder segments - Google Patents

Construction method for large conical cylinder segments Download PDF

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Publication number
CN110576939A
CN110576939A CN201910463990.5A CN201910463990A CN110576939A CN 110576939 A CN110576939 A CN 110576939A CN 201910463990 A CN201910463990 A CN 201910463990A CN 110576939 A CN110576939 A CN 110576939A
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CN
China
Prior art keywords
conical
conical ring
welding
built
segments
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Pending
Application number
CN201910463990.5A
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Chinese (zh)
Inventor
金国飞
庄劲松
吴佩
柯于舫
柯金
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Hudong Zhonghua Shipbuilding Group Co Ltd
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Hudong Zhonghua Shipbuilding Group Co Ltd
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Priority to CN201910463990.5A priority Critical patent/CN110576939A/en
Publication of CN110576939A publication Critical patent/CN110576939A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a construction method of a large conical cylinder section, which comprises the following steps: step one, dividing a conical cylinder body to be built into a plurality of conical ring sections to be built along the circumferential direction in a segmented mode; step two, dividing the plurality of conical ring segments to be built into a plurality of arc segments along the radial direction respectively and processing and forming; thirdly, vertically splicing the circular arc sections on the plane jig frame to form corresponding conical ring sections; step four, splicing the plurality of cone ring segments obtained by splicing into a whole section on a plane jig frame in sequence, and performing tack welding; and step five, horizontally placing the whole subsection on a roller carrier, and welding and forming to obtain the conical barrel subsection. The large conical barrel is divided into the plurality of conical ring segments in sections and then divided into the plurality of arc segments, so that the processing and the forming of the plate are facilitated, the problems that the sectional caliber of the large conical barrel is large, the processing precision cannot be guaranteed, the welding deformation cannot be easily controlled are solved, the construction difficulty is reduced, and the welding efficiency and the welding quality are improved.

Description

Construction method for large conical cylinder segments
Technical Field
The invention belongs to the technical field of ship steel structure construction, and particularly relates to a construction method for a large conical cylinder section.
Background
In the existing ship steel structure construction, a large conical cylinder section generally refers to a cylinder section with the minimum inner diameter size of more than 6 meters. The conical barrel section is axially symmetrical, the inner diameter sizes of the front end surface and the rear end surface of the barrel section are different, and the inner diameter size linearly increases or decreases along the axial direction. For small hollow cylinder segments, in the prior art, the cylinder segment is generally divided into two halves along the radial direction, processed on a mechanical device, and then spliced into a circle on a semicircular jig frame. However, for the large conical barrel segment, the prior art has the following defects:
(1) The inner diameter is overlarge, the mechanical processing capacity is limited, and the processing mode that the segment is divided into two halves along the radial direction and is directly processed and formed cannot be met.
(2) the machining radiuses in the radial direction are different, the longer the length of each conical ring segment is, the lower the machining precision is, the inconsistent coincidence degree of the circle centers of the front end and the rear end of the conical ring segments is often caused in the process of splicing into a circle, the conical ring segments are not horizontal to the ground, the butt joint among the conical ring segments is large in super-difference, and secondary machining needs to be performed again.
(3) The larger the inner diameter size is, the higher the height of the corresponding semicircular jig frame is, more jig frames and reinforcing materials need to be consumed, the ascending operation is needed for the personnel construction, and the construction safety is also greatly reduced.
(4) The semi-circular jig frame is folded and built, and after the semi-circular jig frame is divided into two halves and spliced into a circle, only carbon dioxide semi-automatic welding transverse butt welding can be adopted, so that the welding difficulty is high, and the quality is difficult to ensure.
disclosure of Invention
Aiming at the problems in the prior art, the invention provides a sectional construction method of a large conical barrel, which can reduce the construction difficulty of the large conical barrel, can adopt automatic welding and high-efficiency welding, improve the welding efficiency and quality, reduce the welding deformation and solve the problem that the existing large conical barrel cannot be directly processed and molded.
In order to achieve the purpose, the invention adopts the following technical scheme:
The invention provides a construction method of a large conical barrel section, which comprises the following steps:
The method comprises the following steps of firstly, dividing a conical cylinder section to be built into a plurality of conical ring sections to be built along the axial direction according to the height of the conical cylinder section to be built;
Step two, dividing the plurality of conical ring segments to be built in the step one into a plurality of arc segments along the radial direction respectively to obtain parameters of the arc segments and processing and forming the parameters;
Thirdly, vertically splicing a plurality of arc sections corresponding to each conical ring section to be built in the second step into corresponding conical ring sections on a plane jig;
step four, splicing the plurality of conical ring segments obtained by splicing in the step three into a whole section on a plane jig frame in sequence, and performing tack welding;
And step five, horizontally placing the whole subsection obtained in the step four on a roller carrier, and welding and fixing to obtain the conical barrel subsection.
As a preferable technical scheme, the height of the conical ring section to be built in the step one is 2-2.4 meters.
as a preferred technical scheme, in the second step, each conical section to be built is divided into 3-4 circular arc sections.
Preferably, the center line of the planar jig frame coincides with the center line of the conical ring segment in the third step.
in the fourth step, before splicing, the levelness of the end face of each conical ring section is checked by using an electronic level bar, then the circle center of the conical ring section is determined by using a steel wire hanging method, and the circle center mark is made on the ground to serve as the splicing standard of the subsequent conical ring section.
As a preferred technical scheme, in the fourth step, the welding length of the tack welding is 200 mm, the welding distance of the tack welding is 300 mm, and after the tack welding is completed, the levelness of the end face of the conical ring segment at the uppermost end and the contact ratio of the circle centers of the conical ring segments are checked.
As a preferred technical solution, in the fifth step, when the whole segment is placed horizontally, the coordinates of the centers of circles of the two end surfaces of the whole segment are used as a reference for adjustment, and a connecting line between the centers of circles of the two end surfaces is adjusted to be parallel to the horizontal plane.
As a preferable technical scheme, the welding mode in the fifth step is carbon dioxide gas shielded welding.
according to the preferable technical scheme, the plane jig frame is a vertical column jig frame, vertical columns of the jig frame are formed by splicing angle steel, the height of each vertical column is 800 mm, the arc length between every two adjacent vertical columns is 1 m, and inner shell jig plates are arranged on the vertical columns.
Compared with the prior art, the invention has the beneficial effects that: when the conical barrel is built, a mechanical processing and forming mode that the conical ring section is axially divided firstly and then the arc section is radially divided is adopted, the vertical arc section is folded slightly firstly, then the conical ring section is folded greatly, and finally the conical ring section is automatically welded on the roller frame, so that the problems that the large diameter of the large conical barrel section cannot be directly processed and formed, the processing precision cannot be ensured, and the welding deformation is difficult to control are solved, the construction difficulty is greatly reduced on the building mode, the automatic welding and high-efficiency welding can be adopted, the welding efficiency and quality are improved, and the welding deformation is reduced.
drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a sectional construction method of a large conical cylinder according to the invention.
fig. 2 is a schematic structural diagram of the division of the conical ring segment to be built according to the present invention.
fig. 3 is a schematic structural diagram of division in one case of the arc segment of the present invention.
Fig. 4 is a schematic structural diagram of division in another case of the arc segment of the present invention.
FIG. 5 is a schematic view of a closed structure of conical ring segments according to the present invention.
FIG. 6 is a schematic structural view of welding of the cone ring segment according to the present invention.
Fig. 7 is a sectional view taken along the direction B-B of fig. 6.
Fig. 8 is a schematic structural view of the jig frame of the present invention.
Fig. 9 is a sectional view taken along a-a of fig. 8.
wherein the reference numerals are specified as follows: the conical ring comprises a first conical ring section 1 to be built, a second conical ring section 2 to be built, a third conical ring section 3 to be built, a fourth conical ring section 4 to be built, a fifth conical ring section 5 to be built, a sixth conical ring section 6 to be built, an arc section 7, an upright post 8, an inner shell tire plate 9, a roller frame 10, a first conical ring section 11, a second conical ring section 12, a third conical ring section 13, a fourth conical ring section 14, a fifth conical ring section 15 and a sixth conical ring section 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the present embodiment provides a method for constructing a large tapered cylinder segment, which includes dividing the tapered cylinder segment into a plurality of circular arc segments 7, folding the circular arc segments 7 into tapered ring segments, folding the tapered ring segments into a whole segment, turning the whole segment by 90 degrees, and welding to obtain the large tapered cylinder segment.
In this embodiment, the construction of a large conical barrel section with a total length of 13 meters and an inner diameter of 7-9 meters is further described in detail, and the detailed construction steps of the invention are as follows:
Step one, as shown in fig. 2, a large conical cylinder to be built is axially divided into conical ring segments to be built, the height of which is 2-2.4 meters, in this embodiment, the conical ring segments to be built are divided into 6 conical ring segments to be built, and the conical ring segments to be built are marked as a first conical ring segment 1 to be built, a second conical ring segment 2 to be built, a third conical ring segment 3 to be built, a fourth conical ring segment 4 to be built, a fifth conical ring segment 5 to be built, and a sixth conical ring segment 6 to be built according to the sequence of the inner diameters from large to small. The conical ring segment to be built comprises a first conical ring segment 1 to be built, a second conical ring segment 2 to be built, a third conical ring segment 3 to be built, a fourth conical ring segment 4 to be built, a fifth conical ring segment 5 to be built, and a sixth conical ring segment 6, wherein the height of the sixth conical ring segment is 2 meters.
Step two, as shown in fig. 3 and 4, dividing the 6 conical ring segments to be built in the step one into 3-4 arc segments 7, wherein the first conical ring segment 1 to be built is divided into 4 arc segments 7, the sixth conical ring segment 6 to be built is divided into 3 arc segments 7, the rest conical ring segments to be built can be divided into 3 arc segments 7 or 4 arc segments 7, the division number of the arc segments 7 is determined according to the machining capacity, parameters of the arc segments 7 are obtained, and the parameters are machined and molded to form the arc segments 7
And step three, as shown in fig. 5, respectively folding the circular arc sections 7 on the flat jig frame into corresponding first conical ring section 11, second conical ring section 12, third conical ring section 13, fourth conical ring section 14, fifth conical ring section 15 and sixth conical ring section 16, and welding the spliced seam by adopting a positioning welding mode. As shown in fig. 8 and 9, the upright columns 8 of the planar jig frame are formed by splicing angle steels, the heights of the upright columns 8 are unified to be 800 mm, the arc length between every two adjacent upright columns 8 is 1 m, inner shell jig plates 9 are arranged on the upright columns 8, and the inner shell jig plates 9 support the arc sections 7. The design and manufacturing process of the flat bed-jig are well known to those skilled in the art of ship manufacturing, and therefore, will not be described herein.
And step four, as shown in fig. 5, considering that the vertical folding height of the large conical cylinder section with the length of 13 meters is too high, in order to ensure the construction safety, the first conical ring section 11 and the fourth conical ring section 14 are respectively taken as two base surface jig frames, the two base surface jig frames are firstly folded into an upper small section and a lower small section, then the first conical ring section 11 is taken as a base surface jig frame, and then the whole large conical cylinder section is integrally folded. Before each conical ring section is folded, an electronic level ruler is used for carrying out end face levelness inspection, the center of a circle is determined by adopting a steel wire hanging method, and the center of the circle is marked on the ground and is used as a reference for subsequent conical ring section folding. After the whole subsection is closed in the vertical state, considering that the transverse welding efficiency of the annular welding line of the conical ring section is low and the quality is not easy to guarantee, the closing only adopts the tack welding, the welding length is 200 mm, and the interval between the welding lines is 300 mm. Meanwhile, the welding seams on the adjacent conical ring sections are arranged in a staggered mode, for example, the welding seams between the circular arc sections 7 on the first conical ring section 11 and the welding seams between the circular arc sections 7 on the second conical ring section 12 are not on the same straight line.
Step five, as shown in fig. 6 and 7, the whole subsection in the step four is arranged and turned over and then is translated to the roller frame 10, the adjustment is carried out by taking the circle center coordinates of the two end surfaces of the whole subsection as the reference, the connecting line of the circle centers of the two end surfaces is adjusted to be parallel to the horizontal plane, and the deviation is not more than 1 mm. The whole ring segment welding line on the roller frame 10 in segments is electrically welded by CO2The gas shielded welding is automatic welding, so as to improve the welding efficiency and quality.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.

Claims (9)

1. A method for building a large conical barrel section is characterized by comprising the following steps:
The method comprises the following steps of firstly, dividing a conical cylinder section to be built into a plurality of conical ring sections to be built along the axial direction according to the height of the conical cylinder section to be built;
Step two, dividing the plurality of conical ring segments to be built in the step one into a plurality of arc segments along the radial direction respectively to obtain parameters of the arc segments and processing and forming the parameters;
Thirdly, vertically splicing a plurality of arc sections corresponding to each conical ring section to be built in the second step into corresponding conical ring sections on a plane jig;
Step four, splicing the plurality of conical ring segments obtained by splicing in the step three into a whole section on a plane jig frame in sequence, and performing tack welding;
And step five, horizontally placing the whole subsection obtained in the step four on a roller carrier, and welding and forming to obtain the conical barrel subsection.
2. The method for constructing a large-scale conical barrel section according to claim 1, wherein the height of the conical ring segment to be constructed in the first step is 2-2.4 m.
3. the method for constructing the large conical barrel section according to claim 1, wherein in the second step, each conical section to be constructed is divided into 3-4 circular arc sections.
4. The method for constructing a large-scale conical barrel section according to claim 1, wherein the center line of the planar jig frame in the third step coincides with the center line of the conical ring section.
5. The method for constructing the large-scale conical barrel section according to claim 1, wherein in the fourth step, before splicing, an electronic level bar is used for checking the levelness of the end face of each conical ring section, then the center of the conical ring section is determined by a steel wire hanging method, and the center of the conical ring section is marked on the ground and is used as the splicing standard of the subsequent conical ring section.
6. The method for constructing the large conical barrel section according to claim 1, wherein in the fourth step, the welding length of the tack welds is 200 mm, the welding interval of the tack welds is 300 mm, and after the tack welds are completed, the levelness of the end face of the conical ring section at the uppermost end and the coincidence ratio of the circle centers of the conical ring sections are checked.
7. The sectional construction method for the large conical cylinder according to claim 1, wherein in the fifth step, when the whole section is horizontally placed, the coordinates of the centers of the two end surfaces of the whole section are used as a reference for adjustment, and the connecting line of the centers of the two end surfaces is adjusted to be parallel to the horizontal plane.
8. the sectional construction method of a large-sized taper cylinder according to claim 1, wherein the welding in the fifth step is carbon dioxide arc welding.
9. The sectional construction method of the large conical barrel according to claim 1, wherein the planar jig is a column jig, the columns of the jig are spliced by angle steel, the height of each column is 800 mm, the arc length between every two adjacent columns is 1 m, and inner shell jig plates are arranged on the columns.
CN201910463990.5A 2019-05-30 2019-05-30 Construction method for large conical cylinder segments Pending CN110576939A (en)

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN113083958A (en) * 2021-03-15 2021-07-09 宁波骋拓金属制造有限公司 Edge rolling production method

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CN113083958A (en) * 2021-03-15 2021-07-09 宁波骋拓金属制造有限公司 Edge rolling production method

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