CN115535174A

CN115535174A - General assembly method for large-opening broadside sections

Info

Publication number: CN115535174A
Application number: CN202211157236.7A
Authority: CN
Inventors: 王永亮; 杨宏发; 高攀; 蔡乐
Original assignee: Shanghai Jiangnan Changxing Shipbuilding Co Ltd
Current assignee: Shanghai Jiangnan Changxing Shipbuilding Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2022-12-30

Abstract

The invention relates to a general assembly method of a large-opening broadside section, which comprises the following steps: firstly, positioning two side sections by adopting a crane, and synchronously placing the two side sections left and right; secondly, erecting a distance-keeping beam between two side sections to form a frame structure, adding braces at the head and the tail inside the side, and hanging plumbs at the head and the tail ends of the side planking; thirdly, marking and cutting the allowance, marking the allowance of the part needing to be cut of the broadside subsection according to the positioning numerical value of the broadside subsection and the theoretical value needed by the broadside structure in place measured in the first step, and cutting the allowance; and fourthly, measuring the broadside sections and rechecking by using a plumb bob to finish final positioning. According to the total assembly method of the large-opening side sections, the distance-keeping beams and the braces are arranged on the two side sections to form a frame structure, so that the two side sections are prevented from toppling, the distance-keeping beams are used as rigid supports to increase the strength of the large-opening side, and the ship body is prevented from deforming.

Description

General assembly method for large-opening broadside sections

Technical Field

The invention relates to the technical field of ship manufacturing, in particular to a general assembly method of a large-opening broadside section.

Background

The ship industry often requires shortening the hoisting time in the building process to improve the hoisting efficiency. The traditional hoisting method is applied to the assembling process of the large-opening side section, the efficiency is low due to the long service time of a crane, and the large-opening side section is easy to topple.

The comparison document 1 (CN 107140113A) discloses an assembling method of a side section and a bilge section of an oil tanker, which is characterized in that a left wall pier and a right wall pier are respectively divided into two sections, and the two sections are respectively integrated with the bilge section and the bottom section of the corresponding side, so that the wall pier is cancelled as an independent section, the welding of the wall pier with the bilge and the bottom is reduced, the difficulty of large folding operation is reduced, the assembling steps are simplified, and the working efficiency is improved; the shipboard segment and the bilge segment are assembled on the ground in advance by taking the outer plate as a reference bottom surface, the difficulty of precision control during vertical carrying and hoisting is greatly reduced when the shipboard segment and the bilge segment are not assembled, and the bilge segment and the shipboard segment are butted on the ground, so that the original transverse welding can be converted into the common flat welding, the welding quality is improved, the clamping codes are prevented from being used for adjusting and aligning, the repair rate is greatly reduced, and the working efficiency is improved. The method for assembling the side section and the bilge section in the comparison document 1 solves the problem of low working efficiency caused by long hoisting time in the assembling process of the side section and the bilge section, but does not solve the problem of easy dumping of the side, and the comparison document 1 is only used for assembling the side section and the bilge section, and cannot solve the problem of hull deformation caused by weak structural strength of the large-opening side section.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a method for assembling the broadside sections with large openings, which can solve the problem of hull deformation caused by weak structural strength of the broadside sections.

In order to achieve the above object, the technical solution of the present invention is as follows:

a method of assembling a wide open broadside section, the method comprising the steps of:

the method comprises the steps that firstly, broadside positioning is carried out, two broadside sections are positioned by a crane and are synchronously placed on the left side and the right side of the ground, and positioning data of the two broadside sections are detected by a measuring instrument to ensure that the positioning data accord with theoretical values required by broadside structure in-place;

step two, installing a field tool, and erecting a distance-keeping beam to connect the two broadside sections to form a frame structure under the condition that the crane keeps lifting the two broadside sections after positioning; respectively erecting a brace at the head end and the tail end of the frame structure to prevent the frame structure from inclining to one side; the left and right ground sample lines are arranged on the ground in advance, a plumb bob is respectively arranged at the head end and the tail end of the outer plates of the two broadside subsections, the left and right directions of the two broadside subsections are adjusted according to the positions of the plumb bob and the ground sample lines, and a crane is used for releasing a hook;

step three, marking and cutting the allowance, marking the allowance on the part of the frame structure needing to be cut according to the positioning data and a theoretical value required by the in-place installation of the frame structure, and cutting the allowance;

and fourthly, final positioning is carried out, the frame structure is adjusted left and right through the brace, deviation between the plumb bob and the ground sample line is checked at any time, and after the adjustment is in place, the contact surfaces of the two broadside sections are subjected to burning constraint welding to complete final positioning.

Preferably, in the first step, the offset amount of the two broadside segments is less than or equal to 3mm.

According to the preferable technical scheme, the number of the distance-keeping beams is two, the two distance-keeping beams are symmetrically arranged, and two ends of each distance-keeping beam are respectively fixed to the top of the inner side of one side section and the bottom plate of the other side section.

Preferably, in the second step, the deviation between the plumb bob position and the ground sample line position is not more than 2mm.

Preferably, in the third step, the cutting precision of the margin is less than or equal to 3mm.

Preferably, in the fourth step, the error of the frame structure in the front-back and height directions is less than or equal to 5mm.

As a preferable technical scheme, after the final positioning is finished, the overall error of the broadside section is less than or equal to 5mm.

The side section comprises an outer plate, a side longitudinal girder and a plurality of small frame sections, wherein the outer plate is positioned on the outer side of the side section, and the small frame sections and the side longitudinal girder are arranged on the inner side of the outer plate.

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the method for assembling the large-opening side sections, the two side sections are synchronously positioned, the service time of a crane is short, and the construction efficiency is improved;

(2) According to the total assembly method of the large-opening side subsection, the distance-keeping beam and the brace are arranged to form the frame structure, so that the side subsection is not prone to toppling;

(3) According to the total assembling method of the large-opening side sections, the distance-keeping beam is used as the rigid support, so that the strength of the large-opening side is increased, and the ship body is prevented from deforming.

Drawings

Fig. 1 is a structural schematic diagram of a general assembly method of a large-opening broadside section of the invention.

In the figure: 1. shipboard segmentation; 2. bracing; 3. a distance maintaining beam; 4. and (4) a plumb bob.

Detailed Description

The technical scheme of the invention is further described by combining the specific embodiments as follows:

as shown in fig. 1, a method for assembling a large opening broadside segment comprises the following steps:

the method comprises the steps of firstly, carrying out broadside positioning, namely positioning two broadside sections 1 by using a crane, synchronously placing the two broadside sections 1 on the left side and the right side of the ground, detecting positioning data of the two broadside sections 1 by using a measuring instrument, ensuring that the positioning data accord with a theoretical value required by broadside structure in-place, and enabling the dislocation quantity of the two broadside sections 1 to be less than or equal to 3mm. The side section 1 comprises an outer plate, a side longitudinal girder and a plurality of small frame sections, the outer plate is positioned on the outer side of the side section 1, and the small frame sections and the side longitudinal girder are arranged on the inner side of the outer plate.

Step two, installing a field tool, erecting two symmetrically arranged distance-keeping beams 3 to connect the two shipboard sections 1 to form a frame structure under the condition that the positioning is finished and the two shipboard sections 1 are still in a hoisting state, wherein two ends of the distance-keeping beams 3 are respectively fixed on the top of the inner side of one shipboard section 1 and the bottom plate of the other shipboard section 1; the head and the tail ends of the frame structure are respectively provided with the brace 2, so that the left and right width adjustment is facilitated, and the frame structure can be prevented from toppling aside; the method comprises the following steps that a left ground sample line and a right ground sample line are arranged on the ground in advance, a plumb bob 4 is arranged at the head end and the tail end of an outer plate of two side sections 1 respectively, the left width and the right width of a side upper opening need to be adjusted according to the position of the plumb bob 4 and the position of the ground sample line, the adjustment of the two side sections 1 ensures that the deviation amount between the position of the plumb bob 4 and the position of the ground sample line is less than or equal to 2mm, a crane can be unhooked after the steps are completed, and the subsequent steps can be completed without the intervention of the crane. Therefore, the service time of the crane is shortened, and the working efficiency is improved.

Thirdly, marking and trimming the allowance, wherein after the second step is finished, a gap in the height direction exists between the broadside section 1 and the lower butt-joint section, the allowance is marked on the part, needing to be trimmed and trimmed, of the frame structure according to positioning data and a theoretical value needed by the frame structure in place, and the allowance is trimmed, wherein the cutting precision of the allowance is smaller than or equal to 3mm;

and step four, final positioning, namely adjusting the frame structure in the left and right directions through the brace 2, checking the deviation between the plumb bob 4 and the ground sample line at any time, measuring and adjusting the plumb bob through a measuring instrument in the front and back directions and in the height direction to ensure that the left and right errors of the two broadside subsections 1 are less than or equal to 5mm, and fixing the contact surfaces of the two broadside subsections 1 by burning and constraining welding after the adjustment is in place to finish the final positioning. After final positioning, the overall error of the broadside section 1 should be no more than 5mm.

According to the total assembling method of the wide-opening side section 1, the distance keeping beam 3 and the brace 2 are arranged on the two side sections 1 to form a frame structure, so that the two side sections 1 are prevented from toppling, the distance keeping beam 3 is used as a rigid support to increase the strength of the wide-opening side, and the deformation of a ship body is prevented.

The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.

Claims

1. A method of assembling a wide open broadside section, said method comprising the steps of:

firstly, carrying out broadside positioning, namely positioning two broadside sections by adopting a crane, synchronously placing the two broadside sections on the left side and the right side on the ground, and detecting positioning data of the two broadside sections by using a measuring instrument to ensure that the positioning data accords with a theoretical value required by broadside structure in-place;

step two, installing a field tool, and erecting a distance-keeping beam to connect the two broadside sections to form a frame structure under the condition that the crane keeps lifting the two broadside sections after positioning; respectively erecting a brace at the head end and the tail end of the frame structure to prevent the frame structure from toppling aside; a left ground sample line and a right ground sample line are arranged on the ground in advance, a plumb bob is respectively arranged at the head end and the tail end of the outer plates of the two broadside subsections, the left and right directions of the two broadside subsections are adjusted according to the positions of the plumb bob and the ground sample lines, and a crane is used for releasing a hook;

thirdly, marking and cutting the allowance, marking the allowance on the part of the frame structure needing to be cut according to the positioning data and a theoretical value required by the frame structure in place, and cutting off the allowance;

and fourthly, final positioning is carried out, the frame structure is adjusted left and right through the brace, the deviation between the plumb bob and the ground sample line is checked at any time, and after the bracing piece is adjusted in place, the contact surfaces of the two broadside sections are subjected to welding constraint so as to finish the final positioning.

2. The method for assembling the large-opening broadside section, according to claim 1, characterized in that in said step one, the offset of two broadside sections is less than or equal to 3mm.

3. The method for assembling the large-opening broadside sections according to claim 1, wherein the number of the distance-keeping beams is two, the two distance-keeping beams are symmetrically arranged, and two ends of each distance-keeping beam are respectively fixed on the top of the inner side of one broadside section and the bottom plate of the other broadside section.

4. The method for assembling the large-opening broadside section according to claim 1, wherein in said second step, the deviation amount between said plumb bob position and said above-ground sample line position is less than or equal to 2mm.

5. The method for assembling the large-opening broadside section as claimed in claim 1, wherein in the third step, the cutting precision of the margin is less than or equal to 3mm.

6. The method for assembling the large-opening broadside section as claimed in claim 1, wherein in the fourth step, the error of the frame structure in the fore-and-aft and height directions is less than or equal to 5mm.

7. The method for assembling the large-opening broadside section as claimed in claim 1, wherein the overall error of the broadside section is less than or equal to 5mm after the final positioning.

8. The method for assembling the large-opening broadside section, according to claim 1, is characterized in that the broadside section comprises an outer plate, broadside stringers and a plurality of frame small sections, the outer plate is positioned on the outer side of the broadside section, and the frame small sections and the broadside stringers are installed on the inner side of the outer plate.