CN114986009B - Welding method for arc-shaped beam for salvage of sunken ship - Google Patents
Welding method for arc-shaped beam for salvage of sunken ship Download PDFInfo
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- CN114986009B CN114986009B CN202210895386.1A CN202210895386A CN114986009B CN 114986009 B CN114986009 B CN 114986009B CN 202210895386 A CN202210895386 A CN 202210895386A CN 114986009 B CN114986009 B CN 114986009B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
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Abstract
A welding method for fishing arc-shaped beams by a sunken ship comprises the steps of firstly arranging a welding tool with a measurement base point, radially laying a plurality of radial supporting beams with positioning mechanisms, hoisting sub-pieces of a first side plate on the radial supporting beams, positioning and welding the first arc plate and a second arc plate by utilizing the arc edges of the sub-pieces of the first side plate and the positioning mechanisms on the radial supporting beams to control the roundness of an arc within 0.5mm, and finally hoisting and welding the second side plate. The method can stably and efficiently complete the welding of the arc-shaped beam for fishing the large-size sunken ship, and effectively reduce the size error of parts.
Description
Technical Field
The invention belongs to the field of sunken ship salvage, and particularly relates to a method for welding a sunken ship salvage arc-shaped beam.
Background
The ancient sunken ship of 'Changjiang estuary No. two' sinks to bury under the sea bed of the Yangtze river entry, and is whole covered by silt, in order to carry out the protection work of ancient sunken ship and historical relic archaeology work, must salvage totally and protect ancient sunken ship and the intact of historical relic on the ship with sinking the ship. In order to successfully complete the salvage of sunken ships, a set of non-contact integral salvage equipment is developed, wherein the equipment comprises end plates on two sides, a launching frame, an arc-shaped beam and the like. The semi-arc-shaped beams are used as main bearing parts in the process of salvaging the sunken ship and are driven by the launching frame, the plurality of arc-shaped beams are tunneled from the lower part and completely wrap the whole sunken ship and surrounding sludge, and then the special salvage ship is used for salvaging the whole equipment to obtain water.
Because the salvage scheme is adopted for the first time in the field of sunken ship salvage, a plurality of technical difficulties exist in the equipment manufacturing process. Among them, the welding process of the arc beam is one of the main technical difficulties. The sunken ship salvage arc-shaped beam is formed by welding a plurality of steel parts, the diameter of a single arc-shaped beam is about 20 meters, the outer dimension of the cross section is 1m multiplied by 2m, adjacent arc-shaped beams are connected into a whole in a sliding embedded mode in the salvage operation process, the dimensional accuracy, particularly the arc roundness of each arc-shaped beam is required to be controlled to be +/-0.5 mm, and the conventional welding process cannot be used for welding parts with large sizes and meanwhile ensuring the accuracy.
Disclosure of Invention
The invention aims to provide a welding method for salvaging arc-shaped beams by a sunken ship, which can ensure the dimensional precision of the salvaged arc-shaped beams by the sunken ship after welding and assembling.
According to an embodiment of the invention, a welding method for fishing arc beams by a sunken ship is provided, which comprises the following steps:
a) Setting a welding tool, setting a measuring base point on the horizontal ground, and radially laying a plurality of radial support beams by taking the measuring base point as a circle center; respectively arranging a first positioning block and a second positioning block on the radial support beam, so that the distance from the first positioning block to the measurement base point is equal to the first cambered surface radius of the sunken ship salvage arc beam, the distance from the second positioning block to the measurement base point is equal to the second cambered surface radius of the sunken ship salvage arc beam, and the error is not more than 0.5mm;
b) Dividing the sunken ship salvage arc-shaped beam into a first side plate, a second side plate, a first arc plate and a second arc plate, dividing each part into a plurality of sub-pieces respectively, obtaining the plurality of sub-pieces, controlling the roundness of each sub-piece of the first side plate and the second side plate within 0.5mm, and controlling the roundness of each sub-piece of the first arc plate and the second arc plate within 5mm;
c) Sequentially hoisting the sub-pieces of the first side plate onto the welding tool, enabling the distance between the first arc edge of the first side plate and the first positioning block to be equal to the thickness of the first arc plate, and then hoisting the sub-pieces of the first arc plate to enable the sub-pieces to abut against the first positioning block and to be positioned;
d) Pushing the sub-piece of the first side plate along the radial supporting beam to enable the sub-piece of the first side plate to abut against the sub-piece of the first arc plate, performing local spot welding on the sub-piece of the first arc plate to form a first arc plate blank, performing roundness precision rechecking, and performing size correction on a position with out-of-precision;
e) Performing local spot welding on the sub-pieces of the first side plate, welding the sub-pieces of the first side plate together to form a first side plate blank, and welding the first side plate blank and the first arc plate blank together;
f) Sequentially hoisting the sub-pieces of the second arc plate onto the radial support beam to be abutted against the first side plate, performing local spot welding to weld the sub-pieces together to form a second arc plate blank, performing arc precision rechecking, performing size correction on the position with out-of-precision, and then welding the second arc plate blank and the first side plate together;
g) And hoisting the sub-piece of the second side plate to enable a first arc edge and a second arc edge of the sub-piece to be respectively abutted against the first arc plate and the second arc plate and welded with the first arc plate and the second arc plate.
By the method, the roundness of the arc surface of the whole sunken ship salvage arc beam is accurately controlled by controlling the accuracy of the positioning block and the arc edge of the side plate, so that the roundness of the arc surface of the sunken ship salvage arc beam can be controlled within 0.5mm, adjacent sunken ship salvage arc beams can be smoothly and strictly embedded with each other in the sunken ship salvage process, and the weight of a sunken ship is effectively borne.
Further, the radial support beams arranged in the step a) comprise a bottom radial support beam and a top radial support beam, and the bottom radial support beam and the top radial support beam are connected through a longitudinal support structure. The top radial supporting beam and the bottom radial supporting beam are used for positioning the first side plate and the second side plate respectively, and limit effect is achieved on the first arc plate and the second arc plate together, so that welding efficiency and accuracy are improved.
Further, the longitudinal support structure comprises a longitudinal support beam and an inclined reinforcing rib. The longitudinal support beams provide vertical support and the tilt stiffeners provide lateral support to prevent the longitudinal support beams and the top support beams from tilting.
Further, the flatness of a supporting plane formed by the radial supporting beams in the step a) is controlled within 1 mm; controlling the flatness of the sub-pieces of the first side plate and the second side plate in the step b) within 1 mm; in the step e) and the step f), the method further comprises the steps of performing flatness rechecking on the first side plate and the second side plate, and performing size correction on an area with flatness exceeding 1 mm. The flatness is checked in the assembling process of the first side plate and the second side plate sub-pieces, so that the flatness of the first side plate and the second side plate of the finished product sunken ship salvage arc-shaped beam is guaranteed to be within 1mm, and adjacent sunken ship salvage arc-shaped beams can be tightly embedded with each other in the sunken ship salvage process.
Further, the step g) is preceded by a step g 0) of welding a plurality of internal reinforcing panels to the surface of the first side panel blank, the internal reinforcing panels being adapted to provide support for the sub-pieces of the second side panel in the step g). The internal reinforcing plate can improve the overall rigidity of the submerged ship salvaging arc-shaped beam, and meanwhile, the internal reinforcing plate provides support for the sub-parts of the second side plate, so that the welding efficiency and the welding precision are improved.
Further, in the step b), the sub-pieces of the first arc plate and the second arc plate are rolled in a direction that the axis is perpendicular to the ground, so that the sub-pieces of the first arc plate and the second arc plate are prevented from radially deforming under the action of self gravity. As the overall diameter of the arc-shaped beam salvaged by the sunken ship is about 20m, the arc length of the arc plate part is large, the arc plate part is easy to deform under the action of self gravity under the condition of no support, and is processed in the direction that the axis is vertical to the ground in the plate rolling processing process, so that the arc plate part is always supported, and the radial deformation under the action of self weight is avoided.
Further, in the step c) and the step g), when the sub-pieces of the first side plate and the second side plate are hoisted, the radial planes of the sub-pieces of the first side plate and the second side plate are perpendicular to the ground for hoisting, so that the sub-pieces of the first side plate and the second side plate are prevented from deforming in the thickness direction under the action of self gravity. Because the weight of the sub-piece is large, the horizontal hoisting is easy to deform in the thickness direction under the action of the self gravity, and the vertical hoisting is needed to ensure that the gravity of the sub-piece is born in the width direction.
Further, the size correction adopts hydraulic jack mechanical correction or flame correction.
Further, in the step b), the number of the sub-parts divided by the first side plate, the second side plate, the first arc plate and the second arc plate is 2-4. According to the size of the arc-shaped beam salvaged by the sunken ship, 2-4 sub-parts are divided, so that the hoisting and tailor-welding difficulty can be effectively reduced, and excessive welding workload is avoided.
Further, the welding method further comprises h) the steps of: and welding an accessory boss arc plate, a front-end machine head shell and a rear-end sealing plate of the sunken ship salvaging arc beam on the sunken ship salvaging arc beam. And (5) completing the tailor welding work of salvaging the arc-shaped beam by the sunken ship after the accessories are welded.
Drawings
FIG. 1 is a schematic structural view of a sunken ship salvaging apparatus in one embodiment;
FIG. 2 is a schematic structural view of an arc beam for salvage of a sunken ship in one embodiment;
fig. 3 is a schematic structural view of the welding tool for fishing the arc-shaped beam by the sunken ship in one embodiment.
The above-mentioned drawings are intended to illustrate the present invention in detail so that those skilled in the art can understand the technical idea of the present invention, and are not intended to limit the present invention. For the sake of clarity, the drawings described above are only schematic representations of structures relevant to the technical features of the invention, and do not show the complete apparatus and all the details strictly in practical scale.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment herein. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive. Those of skill in the art will appreciate that embodiments described herein may be combined with other embodiments without structural conflict.
In the description herein, unless otherwise expressly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly, as meaning either a movable connection or a fixed connection or an integral entity. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
In the description herein, terms of "upper", "lower", "left", "right", "lateral", "longitudinal", "height", "length", "width", "thickness", "axial", "radial", "circumferential", etc., indicating an orientation or positional relationship, are intended to accurately describe embodiments and to simplify the description, but are not intended to limit the referenced parts or structures to a particular orientation, to be mounted or operated in a particular orientation, and are not to be construed as limiting the embodiments herein.
In the description herein, the terms "first", "second", and the like are used only for distinguishing between different objects and are not to be construed as indicating relative importance or defining the number, specific order, or primary and secondary relationship of the technical features described. In the description herein, "plurality" means at least two.
The ancient sunken ship of 'Changjiang estuary No. two' is sunken under the sea bed of the Yangtze river entry, is determined as the sunken ship of the contemporary stage of Qing dynasty through archaeological exploration, the residual length of the ship body is about 38.5 meters, the residual width is about 7.8 meters, the sunken ship is the wooden sunken ship which is the largest in body quantity and most complete in preservation and is found by the Chinese underwater archaeology, the ship-borne cultural relic quantity is large, the cultural relic value is very high, and the difficulty of integral salvage is very large. In order to completely salvage a sunken ship and keep the cultural relics on the ship intact, a set of non-contact integral salvage equipment as shown in figure 1 is developed. When fishing, firstly, the top beam 4 is sunk to the position of a sunken ship at the bottom of water, and the end plates 3 at the two ends are inserted into the seabed to separate the area of the bow and the stern of the sunken ship from the surrounding seabed; about 20 curved beams 1 are then driven into the seabed in sequence by a launcher 2 mounted on a top beam 4. The structure of the arc-shaped beam 1 is shown in figure 2, the arc-shaped beam 1 is integrally in a semi-circular arc shape, the cross section of the arc-shaped beam 1 is a rectangle with the size of 1m multiplied by 2m, one end of the arc-shaped beam 1 is a front-end machine head 16, the other end of the arc-shaped beam 1 is a sealing plate 15, the launching frame 2 is used as a guide, the front-end machine head 16 is tunnelled into a seabed, the arc-shaped beam 1 penetrates through the lower portion of a hull of a sunken ship, and two ends of the arc-shaped beam 1 are fixed on a top beam 4 after the arc-shaped beam 1 integrally rotates for 180 degrees. Bosses 141 distributed along the circumferential direction of an arc are arranged on the surface of one side of each arc beam 1, mortises 131 distributed along the circumferential direction of the arc are arranged on the surface of the other side of each arc beam 1, the bosses 141 and the mortises 131 on the adjacent arc beams 1 are mutually embedded together, and finally all the arc beams are connected into a whole, so that the sunken ship and surrounding sediments are held together from the lower part of the top beam 4. And then the steel cable is fixed on the top beam 4 by the salvage ship, and the whole sunken ship salvage device is lifted to the water surface to finish the integral salvage of the sunken ship.
The fishing equipment is the first creation in the industry, and the manufacturing process faces a plurality of technical problems. The arc beam 1 is used as a main bearing part, the diameter of the arc beam is up to 20m, meanwhile, in order to ensure that the arc beam can smoothly rotate along the track of the launching frame 2 and is embedded with the adjacent arc Liang Jinmi, the requirement on the size precision of the arc beam is high, the roundness of the arc needs to be controlled within 0.5mm, the flatness of the side face needs to be controlled within 1mm, and the traditional welding method cannot ensure the welding precision while welding and assembling large-size parts.
In order to solve the problems, the embodiment of the invention provides a welding method for a sunken ship salvage arc-shaped beam, which comprises the following steps:
firstly, a sunken ship salvage arc beam welding tool 5 shown in fig. 3 is arranged. A base point is arranged on the horizontal ground, a central shaft 51 is arranged perpendicular to the ground and serves as a measuring base point of the welding tool 5 for fishing the arc-shaped beam by using the sunken ship, and the tool and the part take the side close to the central shaft 51 as the inner side and the side far away from the central shaft 51 as the outer side. Next, a plurality of radial support beams are radially laid around the central axis 51, in some embodiments, 8 or 12 radial support beams are provided, and the radial support beams are arranged at equal intervals in a semicircular shape. In some preferred embodiments, the radial support beams are provided in two layers, including a bottom radial support beam 52 and a top radial support beam 55, with a longitudinal support beam 58 and angled ribs 59 connecting the bottom radial support beam 52 and the top radial support beam 55 and providing longitudinal support. An inner side positioning block and an outer side positioning block are arranged on the radial support beam, wherein a bottom inner side positioning block 53 and a bottom outer side positioning block 54 are arranged on the bottom radial support beam 52, and a top inner side positioning block 56 and a top outer side positioning block 57 are arranged on the top radial support beam 55. The distance from the outer end surfaces of the bottom inner side positioning block 53 and the top inner side positioning block 56 to the central shaft 51 is equal to the radius of the inner surface of the inner cambered surface 11 of the arc beam 1; the distance from the inner end surfaces of the bottom outer side positioning block 54 and the top outer side positioning block 57 to the central shaft 51 is equal to the radius of the outer surface of the outer arc plate 12 of the arc beam 1; the error is controlled within 0.5 mm.
Next, the arc beam 1 is divided into four sections of a first side plate 13, a second side plate 14, an inner arc plate 11 and an outer arc plate 12, and each section is divided into a plurality of sub-pieces. In the preferred embodiment, the first side plate 13 and the second side plate 14 are divided into 4 sub-pieces, the inner arc plate 11 and the outer arc plate 12 are divided into 2 sub-pieces, and the sub-pieces are obtained according to the division manner. In one embodiment, a plate is cut by using a laser cutting device and subjected to groove machining to obtain sub pieces of the first side plate 13 and the second side plate 14, wherein the roundness of the arc edges of the sub pieces of the first side plate 13 and the second side plate 14 is controlled within 0.5mm; and cutting the plate by using laser cutting equipment, performing plate rolling processing by using a plate rolling machine, performing groove processing to obtain sub-pieces of the inner arc plate 11 and the outer arc plate 12, and performing arc precision detection by using an arc detection sample plate ruler, wherein the roundness of the arc surface is controlled within 5 mm.
In a partially preferred embodiment, when the sub-pieces of the inner arc plate 11 and the outer arc plate 12 are rolled and processed, the axes of the sub-pieces are perpendicular to the ground, so that the processed parts of the sub-pieces of the inner arc plate 11 and the outer arc plate 12 can be flatly laid on a processing table to be axially supported, and the problem that the precision of the part is influenced by radial deformation caused by the self weight of the part in a posture that the axes of the sub-pieces are parallel to the ground is avoided.
Then, the sub-pieces of the first side plate 13 are sequentially hoisted onto the bottom radial support beam 52, so that the distance between the inner arc edge and the bottom inner side positioning block 53 is equal to the thickness of the inner arc plate 11, namely, about 100mm, and then the sub-pieces of the inner arc plate 11 are hoisted, so that the inner side surfaces of the sub-pieces abut against the outer end surfaces of the bottom inner side positioning block 53 and the top inner side positioning block 56 for positioning.
The sub-piece of the inner arc plate 11 has certain elasticity on the arc surface, and pushes the sub-piece of the first side plate 13 towards the central shaft 51 along the bottom radial supporting beam 52, so that the sub-piece is abutted against the sub-piece of the inner arc plate 11 and is pressed on the bottom inner side positioning block 53 for positioning, and the arc surface of the sub-piece of the inner arc plate 11 is attached to the arc edge of the sub-piece of the first side plate 13. And welding the positioned sub-parts of the inner arc plate 11 together by using local spot welding to form a blank of the inner arc plate 11, and performing arc precision rechecking by using a three-dimensional laser detector to correct the size of the position with out-of-precision. In the preferred embodiment, hydraulic jacks are used to mechanically correct the out-of-tolerance sites or flame correct them by heating to eliminate dimensional errors.
The sub-pieces of the first side plate 13 are welded together with spot welding into a blank of the first side plate 13 and with a blank of the inner arc plate 11.
Subsequently, the sub-pieces of the outer arc plates 12 are sequentially hoisted onto the bottom radial support beam 52 with their inner side surfaces abutting against the sub-pieces of the first side plate 13 and their outer side surfaces positioned against the inner end surfaces of the bottom and top outer side positioning blocks 54 and 57. And connecting the positioned sub-pieces of the outer arc plate 12 into a blank of the outer arc plate 12 through local spot welding, and performing arc precision rechecking by using a three-dimensional laser detector to perform size correction on the position with out-of-precision. The blank of the outer arc panel 12 is then welded to the blank of the first side panel 13.
Next, the sub-pieces of the second side plate 14 are lifted so that the inner arc edge and the outer arc edge thereof abut against the inner arc plate 11 and the outer arc plate 12, respectively, and are positioned by the top inner side positioning block 56 and the top outer side positioning block 57, and are welded together by spot welding.
In some preferred embodiments, a plurality of internal reinforcing plates 17 are welded to the surface of the first side plate 13 to provide better structural support for the arcuate beam 1. The inner stiffening plate 17 can also provide longitudinal location and support for the sub-members of the second side plate 14 when they are hoisted. The inner reinforcing plate 17 has one end welded to the surface of the first side plate 13 and the other end welded to the second side plate 14, and can also be welded to the inner arc plate 11 and the outer arc plate 12 to enhance the structural stability. And (3) fully welding the butt joint position of the internal reinforcing plate 17 and the splicing positions of the inner arc plate 11, the outer arc plate 12, the first side plate 13 and the second side plate 14, and performing nondestructive testing, and then completing the welding of the main body part of the arc beam 1.
In some preferred embodiments, the flatness of the first side plate 13 and the second side plate 14 is also controlled and checked: firstly, when a bottom radial support beam 52 and a top radial support beam 55 are laid, the support beams are horizontally calibrated, so that the flatness of a support plane formed by the support beams is controlled within 1 mm; when the sub-pieces of the first side plate 13 and the second side plate 14 are hoisted and welded, a three-dimensional laser detector and a level meter are used for carrying out flatness recheck, and the size of an area with flatness exceeding 1mm is corrected. Meanwhile, in some embodiments, when the sub-pieces of the first side plate 13 and the second side plate 14 are hoisted, the postures of the sub-pieces are controlled to enable respective radial planes of the sub-pieces to be perpendicular to the ground in the hoisting process, so that the radial width of each sub-piece bears the self-gravity, and the deformation in the axial thickness is avoided.
Finally, after the main body part of the arc beam 1 is welded, all accessories of the arc beam 1, namely the arc plate where the boss 141 is located, the shell of the front-end machine head 16 and the rear end sealing plate are welded on the arc beam 1, the bottom inner side positioning block 53, the bottom outer side positioning block 54, the top inner side positioning block 56 and the top outer side positioning block 57 are removed, and the tailor welding operation of the sunken ship salvaging arc beam is completed. Before warehousing, a three-dimensional laser detector and a level meter are utilized to carry out final retest on the arc precision and the flatness of the whole arc beam 1.
The above-described embodiments are intended to describe the present invention in further detail with reference to the accompanying drawings, and are not intended to limit the present invention. It is intended that all combinations of elements or method steps which are described in this application, or combinations of elements or method steps, which are not necessarily structural or functional equivalents, are included within the scope of the invention as claimed.
Claims (9)
1. A welding method for fishing arc-shaped beams by sinking ships is characterized by comprising the following steps:
a) Setting a welding tool, setting a measurement base point on a horizontal ground, radially laying a plurality of radial supporting beams by taking the measurement base point as a circle center, wherein each radial supporting beam comprises a bottom radial supporting beam and a top radial supporting beam, and the bottom radial supporting beam and the top radial supporting beam are connected through a longitudinal supporting structure; respectively arranging a first positioning block and a second positioning block on the radial support beam, so that the distance from the first positioning block to the measurement base point is equal to the first cambered surface radius of the sunken ship salvage arc beam, the distance from the second positioning block to the measurement base point is equal to the second cambered surface radius of the sunken ship salvage arc beam, and the error is not more than 0.5mm;
b) Dividing the sunken ship salvage arc-shaped beam into a first side plate, a second side plate, a first arc plate and a second arc plate, dividing each part into a plurality of sub-pieces respectively, obtaining the plurality of sub-pieces, controlling the roundness of each sub-piece of the first side plate and the second side plate within 0.5mm, and controlling the roundness of each sub-piece of the first arc plate and the second arc plate within 5mm;
c) Sequentially hoisting the sub-pieces of the first side plate onto the welding tool, so that the distance between the first arc edge of the first side plate and the first positioning block is equal to the thickness of the first arc plate, and then hoisting the sub-pieces of the first arc plate to abut against the first positioning block for positioning;
d) Pushing the sub-piece of the first side plate along the radial supporting beam to enable the sub-piece of the first side plate to abut against the sub-piece of the first arc plate, performing local spot welding on the sub-piece of the first arc plate to form a first arc plate blank, performing roundness precision rechecking, and performing size correction on a position with out-of-precision;
e) Performing local spot welding on the sub-pieces of the first side plate, welding the sub-pieces of the first side plate together to form a first side plate blank, and welding the first side plate blank and the first arc plate blank together;
f) Sequentially hoisting the sub-pieces of the second arc plate onto the radial support beam to be abutted against the first side plate, performing local spot welding to weld the sub-pieces together to form a second arc plate blank, performing arc precision rechecking, performing size correction on the position with out-of-precision, and then welding the second arc plate blank and the first side plate together;
g) And hoisting the sub-piece of the second side plate to enable a first arc edge and a second arc edge of the sub-piece to be respectively abutted against the first arc plate and the second arc plate and welded with the first arc plate and the second arc plate.
2. The method of welding submerged boat fishing arced beams of claim 1, wherein the longitudinal support structure includes longitudinal support beams and angled reinforcing bars.
3. The welding method for the arc-shaped beams for salvage of sunken ships according to claim 1, wherein the flatness of the support plane formed by the radial support beams in the step a) is controlled within 1 mm; controlling the flatness of the sub-pieces of the first side plate and the second side plate in the step b) within 1 mm; in the step e) and the step f), the method further comprises the steps of performing flatness rechecking on the first side plate and the second side plate, and performing size correction on an area with flatness exceeding 1 mm.
4. The method for welding the sunken ship salvage arc-shaped beam according to claim 1, further comprising a step g 0) before the step g), wherein a plurality of inner reinforcing plates are welded on the surface of the first side plate blank, and the inner reinforcing plates are used for providing support for the sub-piece of the second side plate in the step g).
5. The welding method for the sunken ship salvaging arc-shaped beam as claimed in claim 1, wherein in the step b), the sub-pieces of the first arc plate and the second arc plate are rolled in a direction that the axes are vertical to the ground so as to avoid radial deformation of the sub-pieces of the first arc plate and the second arc plate under the action of self gravity.
6. The welding method for the submerged ship salvage arc-shaped beam according to claim 1, wherein in the step c) and the step g), when the sub-pieces of the first side plate and the second side plate are hoisted, the radial planes of the sub-pieces of the first side plate and the second side plate are vertically hoisted to the ground, so that the sub-pieces of the first side plate and the second side plate are prevented from deforming in the thickness direction under the action of self gravity.
7. The method for welding the sunken ship salvage arc beam of claim 1, wherein the size correction is performed by hydraulic jack mechanical correction or flame correction.
8. The welding method for the sunken ship salvage arc-shaped beam according to claim 1, wherein in the step b), the number of the sub-pieces divided by the first side plate, the second side plate, the first arc plate and the second arc plate is 2-4.
9. The welding method for the sunken ship salvage arc beam of claim 1, further comprising the steps of h): and welding an accessory boss arc plate, a front-end machine head shell and a rear-end sealing plate of the sunken ship salvaging arc beam on the sunken ship salvaging arc beam.
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| CN202210895386.1A CN114986009B (en) | 2022-07-28 | 2022-07-28 | Welding method for arc-shaped beam for salvage of sunken ship |
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