CN101811553B - Preparation and on-board installation process of bridge of cutter suction dredger - Google Patents

Preparation and on-board installation process of bridge of cutter suction dredger Download PDF

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Publication number
CN101811553B
CN101811553B CN2010101229490A CN201010122949A CN101811553B CN 101811553 B CN101811553 B CN 101811553B CN 2010101229490 A CN2010101229490 A CN 2010101229490A CN 201010122949 A CN201010122949 A CN 201010122949A CN 101811553 B CN101811553 B CN 101811553B
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Prior art keywords
welding
crane span
segmentation
line
gudgeon
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CN2010101229490A
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CN101811553A (en
Inventor
刘鹏鑫
刘华
姚祥
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Nantong Gangzha Shipbuilding Co Ltd
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Nantong Gangzha Shipbuilding Co Ltd
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Abstract

The invention discloses a preparation and on-board installation process of crane span of cutter suction dredger. The process comprises the following steps: preparing the jig of a crane span, performing sectionalized assembly of the crane span, performing wire-drawing to the trunnion of the crane span, performing wire-drawing to the trunnion of a hull, closing shipways, fixing the crane span, installing bolts, etc. The process of the invention has the advantages of convenient construction and good construction effect; and the installation time of the crane span is fully reduced, and the total cycle time for the preparation of ships is shortened.

Description

Mounting process on the making of cutter suction dredger crane span structure, the ship
Technical field:
The present invention relates to mounting process on a kind of cutter suction dredger crane span structure making, the ship.
Background technology:
4500m 3Cutter suction dredger crane span structure length is long, crane span structure length overall: 45.755m, highly: 9.052m, width: 6.60m, mounting process is long in time limit on its making, the ship, difficulty is big.
Summary of the invention:
The object of the present invention is to provide a kind of easy construction, mounting process on the cutter suction dredger crane span structure making that construction effect is good, the ship.
Technical solution of the present invention is:
Mounting process on a kind of cutter suction dredger crane span structure making, the ship is characterized in that: comprise the following steps:
(1) the crane span structure moulding bed is made: according to crane span structure bottom line style, adopt the manufacturing of identity moulding bed, the moulding bed offset provides accurate table of offsets or rising data value by the numerical control setting-out; The segmentation that molded lines is changed greatly provides loose tool by setting-out, submits construction after the Numerical control cutting to;
Moulding bed adopts the laser transit line, marks crane span structure center line, crane span structure wide line, big jointing line, middle rib bit line and horizontal check line, and makes the embossing seal mark;
Moulding bed completes, and after the acceptance(check) of submission quality testing department, can carry out the line of segmentation bed board and structure, and the precision strictness that moulding bed is made is controlled;
(2) crane span structure sectional making:
Crane span structure is carried out segmentation: crane span structure is divided into 7 three dimensional units, wherein is divided into five segmentations, segmentation about two segmentations of bridge trunnion one side respectively are divided into again along crane span structure length;
During sectional construction, segmentation weight should be controlled at below the 100T; Bed board must with the moulding bed fixation; The welding compensation rate vertically places 1mm as welding shrinkage-compensating value for laterally placing 0.5mm between each spacing of longitudinals between each strong component; All floors, stringers, the weldering of T-shape combination dress finish, and need after the firer proofreaies and correct, to go up segmentation and install; Must open big chamfered transition when the thin butt joint of thickness of slab, thickness difference>=4mm, its inclined-plane length is that 4 times thickness of slab is poor; The big seam two ends of segmentation stays 300mm to postpone welding, by welding in the lump with annulus behind the building berth segment folding; All dull and stereotyped butt joints all adopt arc to weld automatically, and the above butt joint of>=12mm is all opened the single or double groove, and after one side was shaped, another side must weld behind the back chipping; The plate of the big seam of segmentation docks with plate and section bar all opens single face CO 2Bevel for welding; The then two-sided bevel of hand welding butt joint, the whole bag of tricks welding all require the full impregnated weldering of weld seam; After finishing, the segmentation assembling should conscientiously check its integrality according to drawing requirement;
Conscientiously measure major dimension, horizontal error value after the segmentation completion, and perform record, submit data to berth combination; The necessary bevel of section bar butt joint, another side carbon digs the back chipping back welding, guarantees complete penetraction and fusion in welding; The segmentation final lengths should require to mark big seam according to accuracy standard and cut off surplus; Must check its integrality according to drawing after the segmentation completion, all something that gives the game aways are answered repair welding, are polished;
(3) bridge trunnion backguy:
Should check before the gudgeon line that bridge trunnion belongs to the integrality of the assembly project of segmentation, simultaneously to each segmentation except that with the gudgeon connecting portion all welding engineerings should all complete;
Measure the later final deviate of bridge trunnion place segmentation center line welding, obtain final crane span structure center line;
The steel wire of diameter d=0.8mm, the theoretical weight q=3.924g/m of unit of steel wire are adopted in backguy.The weight w=60kg of lift heavy; On the crane span structure in the perforate center weld band steel in advance, as axle center marking;
Find out size positions in the distance of bridge trunnion place segmentation center line and the interior collar extension of gudgeon; Mark upright position, rib position, gudgeon place line simultaneously; The bridge trunnion height has drawn steel wire with the ocean towards making the marking with the above position line respectively apart from underwater dredge pump motor platform 1800mm;
Mark crane span structure outer wall φ 1680mm respectively with the steel wire axle center line, inwall φ 1280mm circular arc line is installed line of cut as gudgeon, all cuts outward by line during cutting, must finally confirm line of cut based on diameter in kind before the cutting;
The bridge trunnion lifting is filled in, and the gudgeon instrument that puts in place adopts cucurbit or jack slowly to fill in and puts in place; After bridge trunnion was filled in, center line was adjusted at each three of the dress weldering of each face and regulates bolt, and as the usefulness of center line adjusting, left and right sides verticality is adjusted at each four of the dress weldering of each face and regulates bolt, as the usefulness of left and right sides verticality adjustment;
Utilize each to regulate bolt and transfer to required precision, carry out the spot welding location, check and accept, must each to be with the fixation of six blocks of horse plates in the interior outside of gudgeon in the time of examination, the stress shrinkage strain after guaranteeing to weld is controlled within the margin of tolerance; CO is adopted in welding 2The symmetry welding up and down of gas shielded arc welding, little electric current; Welding finishes, treat that it cools off fully after, surveying record axle center completion amount;
(4) hull gudgeon backguy:
Should check before the main hull line that the hull gudgeon belongs to the integrality of the assembly project of segmentation, simultaneously in the segmentation except that with the gudgeon connecting portion all welding engineerings should all complete;
Measure the later final deviate of segmentation center line welding, obtain final segmentation center line;
The steel wire of diameter d=0.8mm, the theoretical weight q=3.924g/m of unit of steel wire are adopted in backguy.The weight w=60kg of lift heavy;
Mark hull gudgeon place rib position upright position line in the segmentation and apart from the height and position line of baseline BL4600mm, and respectively the above position line has been drawn steel wire with the ocean towards making the marking;
Mark 3500mm in the distance respectively with the steel wire axle center line; 4200mm longitudinal wall φ 1408mm circular arc line in interior longitudinal wall φ 1678mm and the distance; As gudgeon line of cut is installed, is all cut outward during cutting, must finally confirm line of cut based on diameter in kind before the cutting by line;
The lifting of hull gudgeon is filled in, and the gudgeon instrument that puts in place adopts cucurbit or jack slowly to fill in and puts in place,
After the hull gudgeon was filled in, center line was adjusted at each three of the dress weldering of each face and regulates bolt, and as the usefulness of center line adjusting, left and right sides verticality is adjusted at each four of the dress weldering of each face and regulates bolt, as the usefulness of left and right sides verticality adjustment;
Utilize each to regulate bolt and transfer to required precision respectively, carry out the spot welding location, check and accept, must each to be with the fixation of six blocks of horse plates in the interior outside of gudgeon in the time of examination, the stress shrinkage strain after guaranteeing to weld is controlled within the margin of tolerance;
CO is adopted in welding 2The symmetry welding up and down of gas shielded arc welding, little electric current; Welding finishes, treat that it cools off fully after, surveying record axle center completion amount;
(5) berth combination:
Mark rib bit line before and after hull center line, the big wiring of segmentation, the big seam in building berth fixation position according to boats and ships, the altitude datum line marks respectively on the hull baseline mark post, and the stamp mark of number going abroad;
Be the gap size between control crane span structure and the main hull; Close up the segmentation of crane span structure afterbody earlier; Adopt laser that the crane span structure center line is harmonized and coincide consistently with building berth/hull center line, it is firm to take big horse plate to fix between crane span structure and the hull, then use with quadrat method forward one by one segmentation carry out building berth and locate;
Segmentation building berth when location, should be according to slope of building berth, promptly the hull bottom baseline is consistent therewith, confirm the hull bottom height after, guarantee parallelism between them, cenlerline of berth and hull bottom center line match, four jiaos of horizontal adjusting of segmentation are accurately carried out split fix then;
The big seam rib of segmentation apart from all be controlled at ± 15mm between, must be noted that the length overall that guarantees boats and ships during last segment folding, finally confirm the cutting surplus of segmentation, make it the boats and ships length overall and be controlled among 1/1000 margin of tolerance;
Segments in a circular shape seam assembling and positioning all must be used the welding of Φ 3.2mm low-hydrogen electrode; Big seam adopts CO 2Weldering; All must offer groove by following requirement: deck, outside plate, longitudinal wall and inner bottom plating are opened 30 ° of non-structural planes and are stayed root 0~2mm gap 6~8mm groove; Base plate is opened 30 ° of structural planes and is stayed root 0~2mm gap 6~8mm groove, needs welding after polishing smooth after groove is offered; Necessary fixing apart from long horse plate rigidity reinforcement before the big seam assembling and positioning weldering with surpassing a retaining rib, could transfer electric welding;
(6) the crane span structure Fixed latches is installed:
Before Fixed latches is installed, should crane span structure, main hull structure welding completion be applied for checking and examination; Before Fixed latches is installed, should the location be closed up in the lifting of crane span structure leading portion and finish, close up the seam welding completion greatly and apply for checking and examination; The uniformity of inspection Fixed latches processing dimension and drawing, and whether the bevel for welding that the big chamfered transition groove of periphery is connected with structure is perfect;
On platform, be combined into one crane span structure Fixed latches and portal frame Fixed latches in advance; The assurance upper-lower position in 8mm gap overlaps between two latches; Make liner with the continuous firm position of two pinboards with the 8mm steel plate then, strengthen making it to fuse between the two and with fixed block temporarily; At two liftings of two Fixed latches upper end dress welderings eye plate;
According to crane span structure Fixed latches arrangement requirement to the perforate of ruling of crane span structure and portal frame structure, during line: must be noted that portal frame is different with the shape of two latch appearance and sizes of crane span structure;
After portal frame and the portal structure line, carry out cutting and opening holes again, bore size should add about 1.5mm with the Fixed latches periphery, leaves bevel for welding simultaneously;
The lateral partitions of crane span structure Fixed latches installed position is cut off,, treat again its setting-in to be put in place behind the pinboard location so that lifting puts in place smoothly;
With Fixed latches composite member hoisting and locating, confirming that under the situation that size is coincide, formally weld the side; Require before the weldering to be preheated to 150 ℃~200 ℃, postwelding is taked the insulation measure, and welding rod uses low-hydrogen electrode, and welding wire uses H08mn2siA;
At first guarantee the completion of crane span structure pinboard and portal structure welding, when the pinboard end opening docks horizontal joint with crane span structure and is welded with difficulty, can offer fabrication hole to the end opening of portal frame pinboard, ceramic substrate is posted, this is sewn on crane span structure inside and welds; All welding must be carried out symmetrical welding up and down;
The welding of portal frame Fixed latches: the every position that possibly weld completion that should be all over; To the position that can not weld between crane span structure and the portal frame; After treating that all engineerings of crane span structure all complete; Locating piece between original two Fixed latches is removed, be lowered to crane span structure then and can carry out welding operation construction state, again portal frame outside plate and pinboard butt joint are welded.
Easy construction of the present invention, construction effect is good; Fully compress the building berth set-up time, shortened the overall cycle of shipbuilding.
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is crane span structure segmentation division figure.
Fig. 2 is that axle is state diagram.
Fig. 3 is the backguy state diagram.
Fig. 4 is a crane span structure outer wall view.
Fig. 5 is a longitudinal wall view in the crane span structure.
Fig. 6 is that hull gudgeon wire pulling rack making diagrammatic sketch is regulated in the center.
Fig. 7 is a longitudinal wall diagrammatic sketch in the main hull.
Fig. 8 is a main hull outside plate diagrammatic sketch.
Fig. 9 is that Fixed latches is installed diagrammatic sketch.
Bridge trunnion 1, bearing holder (housing, cover) 2, center regulating block 3, motor platform 4, vertical direction regulating block 5, crane span structure upper deck 6, crane span structure main deck 7, portal frame inner platform 8 etc. are arranged among the figure,
The specific embodiment:
Mounting process on a kind of cutter suction dredger crane span structure making, the ship comprises the following steps:
(1) the crane span structure moulding bed is made: according to crane span structure bottom line style, adopt the manufacturing of identity moulding bed, the moulding bed offset provides accurate table of offsets or rising data value by the numerical control setting-out; The segmentation that molded lines is changed greatly provides loose tool by setting-out, submits construction after the Numerical control cutting to;
Moulding bed adopts the laser transit line, marks crane span structure center line, crane span structure wide line, big jointing line, middle rib bit line and horizontal check line, and makes the embossing seal mark;
Moulding bed completes, and after the acceptance(check) of submission quality testing department, can carry out the line of segmentation bed board and structure, and the precision strictness that moulding bed is made is controlled;
(2) crane span structure sectional making:
Crane span structure is carried out segmentation: crane span structure is divided into 7 three dimensional units; Wherein be divided into five segmentations along crane span structure length, two segmentations of bridge trunnion one side respectively be divided into again segmentation up and down (promptly 7 be segmented on 101, on 101 times, 102,102 times, 103,104,105);
During sectional construction, segmentation weight should be controlled at below the 100T; Bed board must with the moulding bed fixation; The welding compensation rate vertically places 1mm as welding shrinkage-compensating value for laterally placing 0.5mm between each spacing of longitudinals between each strong component; All floors, stringers, the weldering of T-shape combination dress finish, and need after the firer proofreaies and correct, to go up segmentation and install; Must open big chamfered transition when the thin butt joint of thickness of slab, thickness difference>=4mm, its inclined-plane length is that 4 times thickness of slab is poor; The big seam two ends of segmentation stays 300mm to postpone welding, by welding in the lump with annulus behind the building berth segment folding; All dull and stereotyped butt joints all adopt arc to weld automatically, and the above butt joint of>=12mm is all opened the single or double groove, and after one side was shaped, another side must weld behind the back chipping; The plate of the big seam of segmentation docks with plate and section bar all opens single face CO 2Bevel for welding; The then two-sided bevel of hand welding butt joint, the whole bag of tricks welding all require the full impregnated weldering of weld seam; After finishing, the segmentation assembling should conscientiously check its integrality according to drawing requirement;
Conscientiously measure major dimension, horizontal error value after the segmentation completion, and perform record, submit data to berth combination; The necessary bevel of section bar butt joint, another side carbon digs the back chipping back welding, guarantees complete penetraction and fusion in welding; The segmentation final lengths should require to mark big seam according to accuracy standard and cut off surplus; Must check its integrality according to drawing after the segmentation completion, all something that gives the game aways are answered repair welding, are polished;
(3) bridge trunnion backguy:
Should check before the gudgeon line that bridge trunnion belongs to the integrality of the assembly project of segmentation, simultaneously to each segmentation except that with the gudgeon connecting portion all welding engineerings should all complete;
Measure the later final deviate of bridge trunnion place segmentation center line welding, obtain final crane span structure center line;
The steel wire of diameter d=0.8mm, the theoretical weight q=3.924g/m of unit of steel wire are adopted in backguy.The weight w=60kg of lift heavy; On the crane span structure in the perforate center weld band steel in advance, as axle center marking;
Find out size positions in the distance of bridge trunnion place segmentation center line and the interior collar extension of gudgeon; Mark upright position, rib position, gudgeon place line simultaneously; The bridge trunnion height has drawn steel wire with the ocean towards making the marking with the above position line respectively apart from underwater dredge pump motor platform 1800mm;
Mark crane span structure outer wall φ 1680mm respectively with the steel wire axle center line, inwall φ 1280mm circular arc line is installed line of cut as gudgeon, all cuts outward by line during cutting, must finally confirm line of cut based on diameter in kind before the cutting;
The bridge trunnion lifting is filled in, and the gudgeon instrument that puts in place adopts cucurbit or jack slowly to fill in and puts in place; After bridge trunnion was filled in, center line was adjusted at each three of the dress weldering of each face and regulates bolt, and as the usefulness of center line adjusting, left and right sides verticality is adjusted at each four of the dress weldering of each face and regulates bolt, as the usefulness of left and right sides verticality adjustment;
Utilize each to regulate bolt and transfer to required precision, carry out the spot welding location, check and accept, must each to be with the fixation of six blocks of horse plates in the interior outside of gudgeon in the time of examination, the stress shrinkage strain after guaranteeing to weld is controlled within the margin of tolerance; CO is adopted in welding 2The symmetry welding up and down of gas shielded arc welding, little electric current; Welding finishes, treat that it cools off fully after, surveying record axle center completion amount;
(4) hull gudgeon backguy:
Should check before the main hull line that the hull gudgeon belongs to the integrality of the assembly project of segmentation, simultaneously in the segmentation except that with the gudgeon connecting portion all welding engineerings should all complete;
Measure the later final deviate of segmentation center line welding, obtain final segmentation center line;
The steel wire of diameter d=0.8mm, the theoretical weight q=3.924g/m of unit of steel wire are adopted in backguy.The weight w=60kg of lift heavy;
Mark hull gudgeon place rib position upright position line in the segmentation and apart from the height and position line of baseline BL4600mm, and respectively the above position line has been drawn steel wire with the ocean towards making the marking;
Mark 3500mm in the distance respectively with the steel wire axle center line; 4200mm longitudinal wall φ 1408mm circular arc line in interior longitudinal wall φ 1678mm and the distance; As gudgeon line of cut is installed, is all cut outward during cutting, must finally confirm line of cut based on diameter in kind before the cutting by line;
The lifting of hull gudgeon is filled in, and the gudgeon instrument that puts in place adopts cucurbit or jack slowly to fill in and puts in place,
After the hull gudgeon was filled in, center line was adjusted at each three of the dress weldering of each face and regulates bolt, and as the usefulness of center line adjusting, left and right sides verticality is adjusted at each four of the dress weldering of each face and regulates bolt, as the usefulness of left and right sides verticality adjustment;
Utilize each to regulate bolt and transfer to required precision respectively, carry out the spot welding location, check and accept, must each to be with the fixation of six blocks of horse plates in the interior outside of gudgeon in the time of examination, the stress shrinkage strain after guaranteeing to weld is controlled within the margin of tolerance;
CO is adopted in welding 2The symmetry welding up and down of gas shielded arc welding, little electric current; Welding finishes, treat that it cools off fully after, surveying record axle center completion amount;
(5) berth combination:
Mark rib bit line before and after hull center line, the big wiring of segmentation, the big seam in building berth fixation position according to boats and ships, the altitude datum line marks respectively on the hull baseline mark post, and the stamp mark of number going abroad;
Be the gap size between control crane span structure and the main hull; Close up the segmentation of crane span structure afterbody earlier; Adopt laser that the crane span structure center line is harmonized and coincide consistently with building berth/hull center line, it is firm to take big horse plate to fix between crane span structure and the hull, then use with quadrat method forward one by one segmentation carry out building berth and locate;
Segmentation building berth when location, should be according to slope of building berth, promptly the hull bottom baseline is consistent therewith, confirm the hull bottom height after, guarantee parallelism between them, cenlerline of berth and hull bottom center line match, four jiaos of horizontal adjusting of segmentation are accurately carried out split fix then;
The big seam rib of segmentation apart from all be controlled at ± 15mm between, must be noted that the length overall that guarantees boats and ships during last segment folding, finally confirm the cutting surplus of segmentation, make it the boats and ships length overall and be controlled among 1/1000 margin of tolerance;
Segments in a circular shape seam assembling and positioning all must be used the welding of Φ 3.2mm low-hydrogen electrode; Big seam adopts CO 2Weldering; All must offer groove by following requirement: deck, outside plate, longitudinal wall and inner bottom plating are opened 30 ° of non-structural planes and are stayed root 0~2mm gap 6~8mm groove; Base plate is opened 30 ° of structural planes and is stayed root 0~2mm gap 6~8mm groove, needs welding after polishing smooth after groove is offered; Necessary fixing apart from long horse plate rigidity reinforcement before the big seam assembling and positioning weldering with surpassing a retaining rib, could transfer electric welding;
(6) the crane span structure Fixed latches is installed:
Before Fixed latches is installed, should crane span structure, main hull structure welding completion be applied for checking and examination; Before Fixed latches is installed, should the location be closed up in the lifting of crane span structure leading portion and finish, close up the seam welding completion greatly and apply for checking and examination; The uniformity of inspection Fixed latches processing dimension and drawing, and whether the bevel for welding that the big chamfered transition groove of periphery is connected with structure is perfect;
On platform, be combined into one crane span structure Fixed latches and portal frame Fixed latches in advance; The assurance upper-lower position in 8mm gap overlaps between two latches; Make liner with the continuous firm position of two pinboards with the 8mm steel plate then, strengthen making it to fuse between the two and with fixed block temporarily; At two liftings of two Fixed latches upper end dress welderings eye plate;
According to crane span structure Fixed latches arrangement requirement to the perforate of ruling of crane span structure and portal frame structure, during line: must be noted that portal frame is different with the shape of two latch appearance and sizes of crane span structure;
After portal frame and the portal structure line, carry out cutting and opening holes again, bore size should add about 1.5mm with the Fixed latches periphery, leaves bevel for welding simultaneously;
The lateral partitions of crane span structure Fixed latches installed position is cut off,, treat again its setting-in to be put in place behind the pinboard location so that lifting puts in place smoothly;
With Fixed latches composite member hoisting and locating, confirming that under the situation that size is coincide, formally weld the side; Require before the weldering to be preheated to 150 ℃~200 ℃, postwelding is taked the insulation measure, and welding rod uses low-hydrogen electrode, and welding wire uses H08mn2siA;
At first guarantee the completion of crane span structure pinboard and portal structure welding, when the pinboard end opening docks horizontal joint with crane span structure and is welded with difficulty, can offer fabrication hole to the end opening of portal frame pinboard, ceramic substrate is posted, this is sewn on crane span structure inside and welds; All welding must be carried out symmetrical welding up and down;
The welding of portal frame Fixed latches: the every position that possibly weld completion that should be all over; To the position that can not weld between crane span structure and the portal frame; After treating that all engineerings of crane span structure all complete; Locating piece between original two Fixed latches is removed, be lowered to crane span structure then and can carry out welding operation construction state, again portal frame outside plate and pinboard butt joint are welded.

Claims (1)

  1. A cutter suction dredger crane span structure make, mounting process on the ship, it is characterized in that: comprise the following steps:
    (1) the crane span structure moulding bed is made: according to crane span structure bottom line style, adopt the manufacturing of identity moulding bed, the moulding bed offset provides accurate table of offsets or rising data value by the numerical control setting-out; The segmentation that molded lines is changed greatly provides loose tool by setting-out, submits construction after the Numerical control cutting to;
    Moulding bed adopts the laser transit line, marks crane span structure center line, crane span structure wide line, big jointing line, middle rib bit line and horizontal check line, and makes the embossing seal mark;
    Moulding bed completes, and after the acceptance(check) of submission quality testing department, can carry out the line of segmentation bed board and structure, and the precision strictness that moulding bed is made is controlled;
    (2) crane span structure sectional making:
    Crane span structure is carried out segmentation: crane span structure is divided into 7 three dimensional units, wherein is divided into five segmentations, segmentation about two segmentations of bridge trunnion one side respectively are divided into again along crane span structure length;
    During sectional construction, segmentation weight should be controlled at below the 100T; Bed board must with the moulding bed fixation; The welding compensation rate vertically places 1mm as welding shrinkage-compensating value for laterally placing 0.5mm between each spacing of longitudinals between each strong component; All floors, stringers, the weldering of T-shape combination dress finish, and need after the firer proofreaies and correct, to go up segmentation and install; Must open big chamfered transition when the thin butt joint of thickness of slab, thickness difference>=4mm, its inclined-plane length is that 4 times thickness of slab is poor; The big seam two ends of segmentation stays 300mm to postpone welding, by welding in the lump with annulus behind the building berth segment folding; All dull and stereotyped butt joints all adopt arc to weld automatically, and the above butt joint of>=12mm is all opened the single or double groove, and after one side was shaped, another side must weld behind the back chipping; The plate of the big seam of segmentation docks with plate and section bar all opens single face CO 2Bevel for welding; The then two-sided bevel of hand welding butt joint, the whole bag of tricks welding all require the full impregnated weldering of weld seam; After finishing, the segmentation assembling should conscientiously check its integrality according to drawing requirement;
    Conscientiously measure major dimension, horizontal error value after the segmentation completion, and perform record, submit data to berth combination; The necessary bevel of section bar butt joint, another side carbon digs the back chipping back welding, guarantees complete penetraction and fusion in welding; The segmentation final lengths should require to mark big seam according to accuracy standard and cut off surplus; Must check its integrality according to drawing after the segmentation completion, all something that gives the game aways are answered repair welding, are polished;
    (3) bridge trunnion backguy:
    Should check before the gudgeon line that bridge trunnion belongs to the integrality of the assembly project of segmentation, simultaneously to each segmentation except that with the gudgeon connecting portion all welding engineerings should all complete;
    Measure the later final deviate of bridge trunnion place segmentation center line welding, obtain final crane span structure center line;
    The steel wire of diameter d=0.8mm, the theoretical weight q=3.924g/m of unit of steel wire are adopted in backguy.The weight w=60kg of lift heavy; On the crane span structure in the perforate center weld band steel in advance, as axle center marking;
    Find out size positions in the distance of bridge trunnion place segmentation center line and the interior collar extension of gudgeon; Mark upright position, rib position, gudgeon place line simultaneously; The bridge trunnion height has drawn steel wire with the ocean towards making the marking with the above position line respectively apart from underwater dredge pump motor platform 1800mm;
    Mark crane span structure outer wall φ 1680mm respectively with the steel wire axle center line, inwall φ 1280mm circular arc line is installed line of cut as gudgeon, all cuts outward by line during cutting, must finally confirm line of cut based on diameter in kind before the cutting;
    The bridge trunnion lifting is filled in, and the gudgeon instrument that puts in place adopts cucurbit or jack slowly to fill in and puts in place; After bridge trunnion was filled in, center line was adjusted at each three of the dress weldering of each face and regulates bolt, and as the usefulness of center line adjusting, left and right sides verticality is adjusted at each four of the dress weldering of each face and regulates bolt, as the usefulness of left and right sides verticality adjustment;
    Utilize each to regulate bolt and transfer to required precision, carry out the spot welding location, check and accept, must each to be with the fixation of six blocks of horse plates in the interior outside of gudgeon in the time of examination, the stress shrinkage strain after guaranteeing to weld is controlled within the margin of tolerance; CO is adopted in welding 2The symmetry welding up and down of gas shielded arc welding, little electric current; Welding finishes, treat that it cools off fully after, surveying record axle center completion amount;
    (4) hull gudgeon backguy:
    Should check before the main hull line that the hull gudgeon belongs to the integrality of the assembly project of segmentation, simultaneously in the segmentation except that with the gudgeon connecting portion all welding engineerings should all complete;
    Measure the later final deviate of segmentation center line welding, obtain final segmentation center line;
    The steel wire of diameter d=0.8mm, the theoretical weight q=3.924g/m of unit of steel wire are adopted in backguy.The weight w=60kg of lift heavy;
    Mark hull gudgeon place rib position upright position line in the segmentation and apart from the height and position line of baseline 4600mm, and respectively the above position line has been drawn steel wire with the ocean towards making the marking;
    Mark 3500mm in the distance respectively with the steel wire axle center line; 4200mm longitudinal wall φ 1408mm circular arc line in interior longitudinal wall φ 1678mm and the distance; As gudgeon line of cut is installed, is all cut outward during cutting, must finally confirm line of cut based on diameter in kind before the cutting by line;
    The lifting of hull gudgeon is filled in, and the gudgeon instrument that puts in place adopts cucurbit or jack slowly to fill in and puts in place,
    After the hull gudgeon was filled in, center line was adjusted at each three of the dress weldering of each face and regulates bolt, and as the usefulness of center line adjusting, left and right sides verticality is adjusted at each four of the dress weldering of each face and regulates bolt, as the usefulness of left and right sides verticality adjustment;
    Utilize each to regulate bolt and transfer to required precision respectively, carry out the spot welding location, check and accept, must each to be with the fixation of six blocks of horse plates in the interior outside of gudgeon in the time of examination, the stress shrinkage strain after guaranteeing to weld is controlled within the margin of tolerance;
    CO is adopted in welding 2The symmetry welding up and down of gas shielded arc welding, little electric current; Welding finishes, treat that it cools off fully after, surveying record axle center completion amount;
    (5) berth combination:
    Mark rib bit line before and after hull center line, the big jointing line of segmentation, the big seam in building berth fixation position according to boats and ships, the altitude datum line marks respectively on the hull baseline mark post, and the stamp mark of number going abroad;
    Be the gap size between control crane span structure and the main hull; Close up the segmentation of crane span structure afterbody earlier; Adopt laser that the crane span structure center line is harmonized and coincide consistently with building berth/hull center line, it is firm to take big horse plate to fix between crane span structure and the hull, then use with quadrat method forward one by one segmentation carry out building berth and locate;
    Segmentation building berth when location, should be according to slope of building berth, promptly the hull bottom baseline is consistent therewith, confirm the hull bottom height after, guarantee parallelism between them, cenlerline of berth and hull bottom center line match, four jiaos of horizontal adjusting of segmentation are accurately carried out split fix then;
    The big seam rib of segmentation apart from all be controlled at ± 15mm between, must be noted that the length overall that guarantees boats and ships during last segment folding, finally confirm the cutting surplus of segmentation, make it the boats and ships length overall and be controlled among 1/1000 margin of tolerance;
    Segments in a circular shape seam assembling and positioning all must be used the welding of Ф 3.2mm low-hydrogen electrode; Big seam adopts CO 2Weldering; All must offer groove by following requirement: deck, outside plate, longitudinal wall and inner bottom plating are opened 30 ° of non-structural planes and are stayed root 0~2mm gap 6~8mm groove; Base plate is opened 30 ° of structural planes and is stayed root 0~2mm gap 6~8mm groove, needs welding after polishing smooth after groove is offered; Necessary fixing apart from long horse plate rigidity reinforcement before the big seam assembling and positioning weldering with surpassing a retaining rib, could transfer electric welding;
    (6) the crane span structure Fixed latches is installed:
    Before Fixed latches is installed, should crane span structure, main hull structure welding completion be applied for checking and examination; Before Fixed latches is installed, should the location be closed up in the lifting of crane span structure leading portion and finish, close up the seam welding completion greatly and apply for checking and examination; The uniformity of inspection Fixed latches processing dimension and drawing, and whether the bevel for welding that the big chamfered transition groove of periphery is connected with structure is perfect;
    On platform, be combined into one crane span structure Fixed latches and portal frame Fixed latches in advance; The 8mm gap is arranged between two latches; The assurance upper-lower position overlaps, and makes liner with the continuous firm position of two pinboards with the 8mm steel plate then, strengthens making it to fuse between the two and with fixed block temporarily; At two liftings of two Fixed latches upper end dress welderings eye plate;
    According to crane span structure Fixed latches arrangement requirement to the perforate of ruling of crane span structure and portal frame structure, during line: must be noted that portal frame is different with the shape of two latch appearance and sizes of crane span structure;
    After portal frame and the portal structure line, carry out cutting and opening holes again, bore size should add about 1.5mm with the Fixed latches periphery, leaves bevel for welding simultaneously;
    The lateral partitions of crane span structure Fixed latches installed position is cut off,, treat again its setting-in to be put in place behind the pinboard location so that lifting puts in place smoothly;
    With Fixed latches composite member hoisting and locating, confirming that under the situation that size is coincide, formally weld the side; Require before the weldering to be preheated to 150 ℃~200 ℃, postwelding is taked the insulation measure, and welding rod uses low-hydrogen electrode, and welding wire uses H08mn2siA;
    At first guarantee the completion of crane span structure pinboard and portal structure welding, when the pinboard end opening docks horizontal joint with crane span structure and is welded with difficulty, can offer fabrication hole to the end opening of portal frame pinboard, ceramic substrate is posted, this is sewn on crane span structure inside and welds; All welding must be carried out symmetrical welding up and down;
    The welding of portal frame Fixed latches: the every position that possibly weld completion that should be all over; To the position that can not weld between crane span structure and the portal frame; After treating that all engineerings of crane span structure all complete; Locating piece between original two Fixed latches is removed, be lowered to crane span structure then and can carry out welding operation construction state, again portal frame outside plate and pinboard butt joint are welded.
CN2010101229490A 2010-03-05 2010-03-05 Preparation and on-board installation process of bridge of cutter suction dredger Expired - Fee Related CN101811553B (en)

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