CN115041853A - Method for manufacturing upper chord block body with hollowed-out transverse connection - Google Patents
Method for manufacturing upper chord block body with hollowed-out transverse connection Download PDFInfo
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- CN115041853A CN115041853A CN202210700520.8A CN202210700520A CN115041853A CN 115041853 A CN115041853 A CN 115041853A CN 202210700520 A CN202210700520 A CN 202210700520A CN 115041853 A CN115041853 A CN 115041853A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000003466 welding Methods 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 238000005192 partition Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 12
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- 210000001503 joint Anatomy 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 26
- 238000009434 installation Methods 0.000 abstract description 3
- 238000004132 cross linking Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
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- 239000003973 paint Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
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- 239000000779 smoke Substances 0.000 description 3
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- 230000001174 ascending effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000009193 crawling Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The upper chord block body is manufactured by adopting an inverted installation method, an upper chord rod and a transverse connection are inverted and assembled into a complete upper chord block body on a special ground jig in advance, and after the upper chord block body is turned over, the upper chord block body, a lower chord rod and a steel box girder are integrally installed so as to finish the manufacture of the upper chord block body; before inversion, dividing the transverse connection into a first transverse connection unit and a second transverse connection unit in advance; assembling and welding the easily-deformed first transverse connection unit and the upper chord member into a whole in advance, and then assembling the easily-deformed first transverse connection unit and the second transverse connection unit; finally, a circular arc decorative plate is installed. The invention solves the technical problems that the hollow cross-linked upper chord steel truss girder bridge is difficult to construct, the construction safety can not be ensured, and the welding quality is seriously deformed; the construction is safe, efficient and reliable; the method can produce products with better quality without other excessive capital investment, has higher feasibility and can be popularized as experience.
Description
Technical Field
The invention belongs to the technical field of fixed building steel truss girder bridge manufacturing, and particularly relates to a manufacturing method of an upper chord block body with a hollowed-out transverse connection.
Background
At present, structures such as upper chords, transverse links and the like of domestic steel truss girder bridges are mostly designed into bolted structures, the upper chords and the transverse links are most common in a rectangular truss mode, and the manufacturing process is relatively easy. Taking the fourth sea-crossing bridge item in the dead of the mining province as an example as shown in fig. 1, the upper chord 1 and the cross-links 2 are structurally designed to be in the shape of a hollowed-out cross-link 2 with an oval middle, and the circumference of the hollowed-out cross-link 2 surrounds the arc blocking plate 24 and is in a full-welded box type structure, so that the hollowed-out cross-link is attractive in shape, but is difficult to manufacture.
According to the conventional scheme in the prior art, an upper chord 1 and a hollow cross-bar 2 are required to be manufactured respectively; when the welding device is installed on site, the upper chords 1 on the two sides are hoisted in place, the cross-linked 2 components with the middle parts hollowed out are hoisted, and finally welding of butt joints between the upper chords 1 and the cross-linked 2 is completed at high altitude.
The problems existing in the prior art are as follows: (1) in the overhead welding operation, the transverse connection 2 has dense middle partition plates 23, narrow space and high construction difficulty, and the safety of field construction personnel cannot be effectively ensured. (2) The hollow-out part of the cross-linking 2 is long and thin in length and small in width, the width of the narrowest part is only 200-400 mm, large deformation can be generated during welding, and the process quality is not guaranteed well. In view of this, the following improvement is proposed.
Disclosure of Invention
The technical problems solved by the invention are as follows: the upper chord block body manufacturing method with the hollowed-out transverse connection adopts the transverse connection block manufacturing and arc plate after-loading process, and utilizes a special ground jig frame to connect an upper chord and the transverse connection into a whole in advance on the ground by adopting a flip-chip method, and finally the whole upper chord and the transverse connection are turned over and assembled with a steel box girder and a lower chord in total, so that a series of technical problems that the upper chord steel truss bridge with the hollowed-out transverse connection is high in construction difficulty, the construction safety cannot be guaranteed, and the welding quality is seriously deformed are solved.
The technical scheme adopted by the invention is as follows: the upper chord block body manufacturing method with the hollowed-out transverse connection adopts an inverted installation method, an upper chord rod and the transverse connection are inverted and assembled into a complete upper chord block body on a special ground jig frame in advance, and after the upper chord block body is turned over integrally, the upper chord block body, a lower chord rod and a steel box girder are integrally installed, so that the upper chord block body manufacturing is completed; before the upper chord block body is inverted, the transverse connection is divided into a first transverse connection unit and a second transverse connection unit in advance; wherein the first transverse connection unit is a deformable block; the transverse connection unit II is a non-deformable block; assembling and welding the easily-deformed first transverse connection unit and the upper chord member into a whole in advance, and then assembling the easily-deformed first transverse connection unit and the second transverse connection unit; and finally, installing the cross connection circumferential arc decorative plate on the assembled cross connection unit I and the cross connection unit II.
In the above technical solution, further: the method comprises the following steps:
s1, welding the first transverse connection unit of the transverse connection and the upper chord member into a whole and then placing the whole upside down on a special jig frame;
s2, inverting the transverse connection unit II of the transverse connection on the special jig frame and welding the transverse connection unit II and the upper chord member into a whole;
s3, placing the other upper chord member on the symmetrical side upside down on the special jig frame and welding the other upper chord member and the transverse connection units into a whole;
s4, welding and detecting butt welds of the first transverse connection unit and the second transverse connection unit to obtain an upper chord block body;
s5, sanding and coating the manufactured upper chord block and the transversely-connected arc decorative plate to be assembled respectively;
s6, installing a cross-linked arc decorative plate on the upper chord block, and performing supplementary coating operation on the welding seam of the arc decorative plate and the upper chord block;
s7, installing a monaural main hook on one side of the upper chord block, and installing a binaural auxiliary hook on the other side of the upper chord block; the ascending and descending of the monaural main lifting hook and the binaural auxiliary lifting hook are cooperatively operated by the gantry crane to complete the turning over work of the upper chord block body;
and S8, integrally mounting the turned upper chord block, the lower chord and the steel box girder to finish the manufacture of the upper chord block.
In the above technical solution, further: the special jig frame consists of a plurality of supporting piers and opposite-pulling screw rods; the support piers are vertically and fixedly supported and installed on the ground and have different heights; the top ends of the support piers with different heights are respectively provided with different cushion block support line shapes; the linear shape and the size of the cushion block supporting line are matched with the size of the surface undulation line shape of the inverted upper chord block body.
In the above technical solution, further: the counter-pulling screw rod consists of an internal thread sleeve, an adjusting screw rod and a hook; the adjusting screw rods are coaxially screwed and matched and installed at the two ends of the inner thread sleeve barrel body in a matching way, and the adjusting screw rods are used for adjusting the extending lengths of the adjusting screw rods; the outer side of the extending end of the adjusting screw rod is coaxially and fixedly connected with the handle part of the hook; the opposite-pulling screw rod is connected with the second transverse connection unit in a hanging mode through a hook body at one end of the opposite-pulling screw rod; the counter-pulling screw rod is hung on the upper chord through the hook body at the other end of the counter-pulling screw rod.
In the above technical solution, further: the transverse connection is formed by welding a transverse connection top plate, a transverse connection bottom plate, a middle partition plate and an arc decorative plate; the transverse connection is divided into a first transverse connection unit and a second transverse connection unit; wherein the first transverse connection unit is of a slender structure; the width of the narrowest part of the transverse connection unit is 200-400 mm.
In the above technical solution, further: before the transverse connection unit II and the upper chord are assembled and welded; the second cross-linking unit is provided with a cross-linking clapboard for manufacturing barrier-free butt joints; the barrier-free butt joint seam end part has no partition plate bulge; and the barrier-free butt joint is used for inserting the second transverse connection unit without clamping stagnation into the inner side of the upper chord and is welded and connected with the upper chord into a whole.
In the above technical solution, further: in step S7: the single-lug main lifting hook is fixedly arranged on the left outer side of the inverted and horizontally arranged upper chord block body; the double-lug auxiliary lifting hook consists of an auxiliary lifting hook I and an auxiliary lifting hook II; the auxiliary lifting hook I is fixedly arranged on the right outer side of the inverted upper chord block body; the auxiliary lifting hook II is fixedly arranged on the lower right side of the inverted upper chord block body; the auxiliary lifting hook I and the auxiliary lifting hook II respectively consist of lifting lugs and auxiliary hooks;
when the turning-over is carried out in the step S7, the method comprises the following steps:
s701, the gantry crane drives the single-lug main lifting hook to ascend on one hand and drives the auxiliary lifting hook to descend on the other hand, so that the inverted and horizontally-arranged upper chord block body is driven to rotate clockwise;
s702, after the original inverted and horizontal upper chord block body is turned clockwise and changed into a vertical state, stopping the action of the portal crane, taking the auxiliary hook down from the lifting lug of the auxiliary lifting hook I, and replacing the auxiliary hook on the lifting lug of the auxiliary lifting hook II;
s703, the gantry crane is started again, the gantry crane drives the single-lug main lifting hook to descend on one hand and drives the auxiliary lifting hook to lift on the other hand, so that the vertical upper chord block body is driven to continue to rotate clockwise, and the gantry crane stops acting until the upper chord block body is overturned to a horizontal upright state;
and S704, after the upper chord block body, the lower chord and the steel box girder which are horizontally and vertically placed are integrally installed, the single-lug main lifting hook and the double-lug auxiliary lifting hook are detached.
Compared with the prior art, the invention has the advantages that:
1. the invention adopts a 'flip-chip method' to assemble the upper chord and the cross link into a complete upper chord block body on a special jig frame on the ground; after the upper chord block body is integrally turned over, the upper chord block body is integrally installed with the steel box girder and the lower chord; the complex transverse connection structure is segmented, the segmented transverse connection unit I is integrally manufactured with the upper chord in advance, and then the transverse connection unit II is assembled, so that the deformation problem of the transverse connection unit I is solved; and finally, a manufacturing process of mounting the arc decorative plate at the back is adopted, so that the product quality is ensured, and the production efficiency is improved.
2. According to the invention, the upper chord and the cross-bar are assembled on the special jig frame on the ground, so that the construction operation of connecting the upper chord and the cross-bar which should be finished at high altitude is changed into the operation on the special jig frame on the ground, thereby not only bringing great convenience to actual production, but also improving the safety of personnel in the construction process; the construction difficulty is reduced, and the product quality is improved; the verification proves that the method has good actual effect and can be popularized as experience.
3. According to the invention, the upper chord block body is assembled on the special jig frame, the positioning and the transferring of the large rod piece can be completed by a beam transporting flat car without the cooperation of a crane, the requirement on the site is lower, and the resource investment is saved, so that the cost is reduced; if the construction period is short, the condition of simultaneously producing a plurality of working faces can be provided, which is beneficial to shortening the manufacturing period.
4. The turning operation of the upper chord block body is completed by means of the lifting fit and the timely transposition operation of the single-lug main lifting hook and the double-lug auxiliary lifting hook of the portal crane, the turning is safe, and the construction is efficient.
5. According to the invention, the complex transverse connection is segmented, and according to the structural characteristics that the first transverse connection unit is easy to deform, the first transverse connection unit which is easy to deform and the upper chord member are combined into a whole, and then the second transverse connection unit is assembled, so that the upper chord block is manufactured, the problem that the first transverse connection unit is easy to deform during welding is avoided, the correction difficulty is reduced, and the production efficiency is improved; the process quality is ensured, and the curve attractiveness is kept; moreover, after the transverse connection is segmented, constructors can avoid crawling in a long distance in a too long narrow limited space, the operation environment of welding or paint coating construction inside the transverse connection is obviously improved, and the safety of the constructors is guaranteed to the maximum extent.
6. The invention avoids assembling the partition board of the second transverse connection unit with the upper chord at the protruding position, but newly manufactures the barrier-free butt joint seam on the transverse connection partition board of the second transverse connection unit, and is used for pushing the second transverse connection unit into the inner side of the upper chord in a barrier-free and clamping-stagnation-free manner, so that the upper chord and the second transverse connection unit are spliced and welded into a whole, the splicing quality is ensured, and the splicing efficiency is improved.
7. The upper chord and the cross-linking structure are complex and the internal space is narrow, so the process sequence of after-loading the arc decorative plate is adopted, namely the arc decorative plate is not installed at the manufacturing stage of the cross-linking unit, and the arc decorative plate is installed after the whole upper chord block is manufactured, thereby effectively improving the operating environment of welding and coating constructors in a limited space, being beneficial to the discharge of smoke dust and harmful gas in paint during welding, improving the qualified rate of welding seams and the coating quality in a box, and improving the production efficiency.
8. The invention produces products with better quality without other excessive capital investment, and the technology has higher feasibility and can be popularized as experience.
Drawings
FIG. 1 is a diagram showing a simulation live-action effect of upper chord blocks with hollowed-out cross connections in the fourth sea-crossing bridge project in the Audita pool of China;
FIG. 2 is a schematic structural view of the upper chord block body with hollowed-out cross connection, a lower chord and a steel box girder of the invention after being installed as a whole;
FIG. 3 is a schematic view of a hollow cross-linking structure according to the present invention;
FIG. 4 is a schematic structural view of an upper chord block to be manufactured with a hollowed-out cross-connection according to the present invention;
FIG. 5 is a schematic view of an assembled and disassembled structure of a top chord and a cross link in the prior art;
FIG. 6 is a schematic view of the assembly and disassembly structure of the upper chord and the cross-bar of the present invention after improvement without obstruction and jamming;
FIG. 7 is a schematic illustration of the present invention FIG. 6 in a barrier-free, jam-free assembly;
FIG. 8 is a schematic structural view of the upper chord and the cross-link assembly after assembly without obstruction and jamming of the present invention;
FIG. 9 is a schematic view of the transverse block of the present invention;
FIG. 10 is a schematic structural diagram of the cross-linking unit I and the upper chord member after being assembled and welded together in step S1;
FIG. 11 is a state view of the first cross member and the upper chord member being positioned on the special jig after being assembled and welded in step S1 according to the present invention;
FIG. 12 is a top view of the first cross member and upper chord of FIG. 11;
FIG. 13 is a final state diagram of step S2 according to the present invention;
FIG. 14 is a top view of the second cross member of FIG. 13 in combination with the top chord;
FIG. 15 is a final state diagram of step S3 according to the present invention;
FIG. 16 is a top view of the upper chord and the second cross-linking unit on the other side of FIG. 15;
FIG. 17 is the final state diagram of step S4;
fig. 18 is a schematic structural view of the cross arc decorative plate to be assembled in step S5;
fig. 19 is a structural schematic view of the upper chord block after the transverse arc decorative plate is assembled in step S6;
fig. 20 is a state diagram after the monaural main hook and the binaural auxiliary hook are attached to the upper chord block in step S7;
FIG. 21 is a final state diagram of step S702;
FIG. 22 is a final state diagram of step S703;
FIG. 23 is a distribution diagram of the supporting piers in the special jig frame of the invention;
FIG. 24 is a cross-sectional view A-A of FIG. 23;
FIG. 25 is an enlarged detail view of part B of FIG. 24;
FIG. 26 is a schematic structural view of a counter-pulling screw in a special jig frame;
in the figure: 1-upper chord; 2-transverse connection, 2-1 transverse connection unit I, and 2-2 transverse connection unit II; 21-transverse connection top plate, 22-transverse connection bottom plate, 23-middle partition plate and 24-arc decorative plate; 201-cross diaphragm, 202-barrier-free butt seam, 2011-diaphragm bulge; 3-a lower chord; 4-steel box girder; 5-special jig frame, 51-support pier, 511-cushion block support line shape, 52-split screw, 521-internal thread sleeve, 522-adjusting screw and 523-hook; 6-single ear main hook, 7-double ear auxiliary hook; 71-auxiliary hook one, 72-auxiliary hook two.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 26 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The manufacturing method of the upper chord block with the hollowed-out transverse connection adopts an inverted installation method, an upper chord 1 and a transverse connection 2 are inverted and assembled on a special ground jig frame 5 in advance to form a complete upper chord block (as shown in figure 17), and after the upper chord block is turned over integrally (as shown in figures 20 to 22), the upper chord block, a lower chord 3 and a steel box girder 4 are installed integrally to complete the manufacturing of the upper chord block (as shown in figure 2); before the upper chord block body is inverted, the transverse connection 2 is divided into a first transverse connection unit 2-1 and a second transverse connection unit 2-2 in advance (as shown in figure 9); wherein the transverse connection unit I2-1 is a deformable block; the transverse connection unit II 2-2 is a non-deformable block; assembling and welding the easily-deformable transverse connection unit I2-1 and the upper chord 1 into a whole in advance, and then assembling the easily-deformable transverse connection unit I2-1 and the transverse connection unit II 2-2 (as shown in figures 10 and 14); finally, the assembled cross connection unit I2-1 and cross connection unit II 2-2 are finally provided with the circular arc decorative plate 24 (shown in figures 17 to 19) around the cross connection 2.
The upper chord 1 and the hollowed cross-section 2 of the main bridge of the cross-sea bridge in the fourth of Aujest, the second are manufactured as a whole, the connection construction operation of the upper chord 1 and the cross-section 2 which should be finished at high altitude originally is changed into the connection construction operation on the special jig frame 5 on the ground, great convenience is brought to actual production, meanwhile, the safety in the construction process is improved, the experience proves that the effect is good, and the upper chord can be popularized as experience.
In the above embodiment, further: the method comprises the following steps:
(as shown in fig. 11 and 12), step S1, welding the first cross-linking unit 2-1 of the cross-linking unit 2 and the upper chord 1 into a whole, and placing the whole upside down on the special jig 5.
It should be noted that: because the internal partition boards of the cross-linking 2 structure are dense and have narrow space, if the connection is carried out at high altitude, the construction difficulty is extremely high, and the safety of field constructors cannot be effectively ensured; therefore, the splicing welding is improved to be carried out on the special jig frame 5 for the ground, and the construction safety is improved.
Meanwhile, the transverse connection unit 2-1 has an overlong length and a small width, so that large deformation is generated during welding, and welding deformation is difficult to control when the integral transverse connection unit 2 is manufactured independently. Therefore, in order to ensure the attractive appearance of the hollow structure modeling curve, the transverse connection 2 is longitudinally divided into two units, namely a transverse connection unit I2-1 and a transverse connection unit II 2-2, by adopting the scheme of sectional and separate manufacturing, so that the deformation is avoided.
(as shown in fig. 13 and 14), step S2 is performed to place the second cross-linking unit 2-2 of the cross-linking unit 2 upside down on the special jig 5 and weld the upper chord 1 group together. Namely, the cross-linking unit I2-1 which is most easy to deform is connected with the upper chord 1 into a whole in advance, and then the cross-linking unit II 2-2 which is not easy to deform is assembled.
(see fig. 15 and 16) step S3, another upper chord 1 on the symmetrical side is placed upside down on the special jig frame 5 and is welded with the second 2-2 groups of the transverse connection units into a whole.
(as shown in fig. 17) step S4, welding and detecting the butt weld of the first cross-linking unit 2-1 and the second cross-linking unit 2-2, so as to obtain the upper chord block.
(as shown in fig. 18), step S5 is performed to sand the manufactured upper chord block and the circular arc decorative plate 24 of the horizontal linkage 2 to be assembled. Namely, the process sequence of installing the arc decorative plate 24 is adopted.
(as shown in fig. 19) step S6, the arc decorative plate 24 of the cross bar 2 is installed on the upper chord block, and the weld seam between the arc decorative plate 24 and the upper chord block is subjected to the supplementary coating operation.
Because the upper chord 1 and the cross link 2 have complex structures and narrow internal space, the invention adopts the process sequence of installing the arc decorative plate 24 afterwards, namely the arc decorative plate 24 is not installed at the manufacturing stage of the cross link unit, and is installed after the whole upper chord block is manufactured, thereby effectively improving the operating environment of welding and coating constructors in limited space, being beneficial to the discharge of smoke dust and harmful gas in paint during welding, improving the qualification rate of welding seams and the coating quality in a box, and improving the production efficiency.
(as shown in fig. 20 to 22) step S7, installing a monaural main hook 6 on one side of the upper chord block, and installing a binaural auxiliary hook 7 on the other side of the upper chord block; the lifting and descending of the monaural main lifting hook 6 and the binaural auxiliary lifting hook 7 are cooperatively operated by the gantry crane to complete the turning over of the upper chord block. Wherein the single-lug main lifting hook 6 bears 400 tons at most; the double-lug auxiliary lifting hook 7 bears 200 tons at most.
(as shown in fig. 20) in the above embodiment, further: in step S7: the single-lug main lifting hook 6 is fixedly arranged on the left outer side of the inverted and horizontally arranged upper chord block body; the double-lug auxiliary lifting hook 7 consists of an auxiliary lifting hook I71 and an auxiliary lifting hook II 72; the auxiliary first lifting hook 71 is fixedly arranged on the right outer side of the inverted upper chord block body; the auxiliary second lifting hook 72 is fixedly arranged at the lower right side of the inverted upper chord block body; the first auxiliary lifting hook 71 and the second auxiliary lifting hook 72 are respectively composed of lifting lugs and auxiliary hooks.
When the turning-over is carried out in the step S7, the method comprises the following steps:
(as shown in fig. 20), in step S701, the gantry crane drives the single-lug main hook 6 to ascend on the one hand and drives the first auxiliary hook 71 to descend on the other hand, so as to drive the inverted and horizontally-arranged upper chord block body to rotate clockwise.
(as shown in fig. 21) in step S702, after the original inverted and horizontal upper chord block body is turned clockwise and changed to the vertical state, the gantry crane stops operating, the auxiliary hook is taken off from the lifting lug of the first auxiliary lifting hook 71, and the auxiliary hook is changed and installed on the lifting lug of the second auxiliary lifting hook 72.
(as shown in fig. 22) step S703, the gantry crane is started again, the gantry crane drives the single-lug main hook 6 to descend on one hand and drives the secondary hook two 72 to lift on the other hand, so as to drive the vertical upper chord block body to continue to rotate clockwise, and the gantry crane stops acting after the upper chord block body is turned to the horizontal normal-position state;
and S704, after the upper chord block body, the lower chord 3 and the steel box girder 4 which are horizontally and vertically placed are integrally installed, the single-lug main lifting hook 6 and the double-lug auxiliary lifting hook 7 are detached.
Therefore, the turning operation of the upper chord block body is completed by means of the lifting fit and timely transposition operation of the single-lug main lifting hook 6 and the double-lug auxiliary lifting hook 7 of the portal crane, the turning is safe, and the construction is efficient.
(as shown in fig. 2) S8, the turned-over upper chord block is integrally installed with the lower chord 3 and the steel box girder 4, and thus the upper chord block is manufactured.
(as shown in fig. 23 and 24) in the above embodiment, further: the special jig frame 5 consists of a plurality of supporting piers 51 and opposite-pulling screw rods 52.
(as shown in fig. 25) the support piers 51 are vertically and fixedly supported and installed on the ground and have different heights; the top ends of the support piers 51 with different heights are respectively provided with different cushion block support line shapes 511; the linear shape and the size of the cushion block supporting linear shape 511 are matched with the size of the surface undulated linear shape of the inverted upper chord block body.
Further, the support pier 51 is made into a truss structure by welding sectional materials; the top end face of the cushion block supporting line shape 511 is made of a steel plate.
(as shown in fig. 26) in the above embodiment, further: the counter-pull screw 52 is composed of an internal thread sleeve 521, an adjusting screw 522 and a hook 523.
The adjusting screw 522 is coaxially screwed and fittingly installed at two ends of the cylinder body of the internal thread sleeve 521, and the adjusting screw 522 is used for adjusting the extending length of the adjusting screw; the outer side of the extending end of the adjusting screw 522 is coaxially and fixedly connected with a handle part of the hook 523; the counter-pulling screw rod 52 is hooked with the transverse connection unit II 2-2 through a hook body of a hook 523 at one end of the counter-pulling screw rod; the counter-pulling screw 52 is hooked with the upper chord 1 through a hook body of a hook 523 at the other end of the counter-pulling screw. Thereby realizing the accurate positioning and supporting of the upper chord 1 and the cross-piece 2.
Therefore, the upper chord 1 and the cross-bar 2 are assembled on the special jig frame 5 on the ground, and the construction operation of connecting the upper chord and the cross-bar which should be finished at high altitude is changed into the operation on the special jig frame 5 on the ground, so that great convenience is brought to actual production, and meanwhile, the safety of personnel in the construction process is improved; the construction difficulty is reduced, and the product quality is improved; the verification proves that the method has good actual effect and can be popularized as experience.
Moreover, the upper chord block body is assembled on the special jig frame 5, the positioning and the transferring of the large rod piece can be completed by a beam transporting flat car without the cooperation of a crane, the requirement on the site is low, and the resource investment is saved, so the cost is reduced; if the construction period is short, the condition of simultaneously producing a plurality of working faces can be provided, which is beneficial to shortening the manufacturing period.
(as shown in fig. 3 and 9) in the above embodiment, further: the transverse connection 2 is formed by welding a transverse connection top plate 21, a transverse connection bottom plate 22, a middle partition plate 23 and an arc decorative plate 24.
The transverse connection 2 is divided into a transverse connection unit I2-1 and a transverse connection unit II 2-2; wherein the transverse connection unit I2-1 is of a slender structure; the width of the narrowest part of the first transverse connection unit 2-1 is 200-400 mm.
Therefore, the complex transverse connection 2 is segmented, and according to the structural characteristics that the slender transverse connection unit I2-1 of the transverse connection 2 is easy to deform, the assembly process of firstly combining the easy-to-deform transverse connection unit I2-1 and the upper chord 1 into a whole and then assembling the transverse connection unit II 2-2 is adopted, so that the upper chord block is manufactured, the problem that the transverse connection unit I2-1 is easy to deform during welding is avoided, the correction difficulty is reduced, and the production efficiency is improved; the process quality is ensured, and the curve attractiveness is kept; moreover, after the 2 sections of horizontal antithetical couplet, constructor can avoid long distance creeping in the narrow limited space of overlength, and the operation environment of welding or paint coating construction in 2 insides of horizontal antithetical couplet has obtained obvious improvement, furthest's guarantee constructor's safety.
For transverse segmentation of the transverse link 2: (as shown in fig. 5, 6, 7, 9) in the above embodiment, further: the transverse connection unit II 2-2 and the upper chord 1 are assembled and welded; the transverse connection unit II 2-2 is provided with a transverse connection clapboard 201 which is provided with an accessible butt joint seam 202; the barrier-free butt seam 202 has no bulkhead projection 2011 at its end; and the barrier-free butt joint seam 202 is used for inserting the transverse connection unit II 2-2 into the inner side of the upper chord 1 in a clamping-stagnation-free horizontal pushing manner and is welded and connected with the upper chord 1 into a whole.
It should be noted that: because the original design structure has some factors influencing assembly, namely, the corners of the partition protrusions 2011 at the upper end and the lower end of the transverse connection partition 201 protrude outwards to a horizontal line, the transverse connection unit II 2-2 cannot be pushed horizontally to enter the inner side of the upper chord 1, and the clamping stagnation problem exists.
In order to avoid the assembly with the upper chord 1 at the position of the partition plate protrusion 2011 of the transverse unit II 2-2, the barrier-free butt joint seam 202 is newly manufactured on the transverse partition plate 201 of the transverse unit II 2-2, and is used for pushing the transverse unit II 2-2 into the inner side of the upper chord 1 in a barrier-free and clamping-stagnation-free manner, so that the upper chord 1 and the transverse unit II 2-2 are spliced and welded into a whole, the splicing quality is ensured, and the splicing efficiency is improved.
The working principle of the invention is as follows: the invention adopts a 'flip-chip method' to assemble the upper chord 1 and the cross bar 2 into a complete upper chord block on a special floor jig 5; after the upper chord block body is integrally turned over, the upper chord block body is integrally installed with the steel box girder 4 and the lower chord 3; by segmenting a complex transverse connection 2 structure, integrally manufacturing a segmented transverse connection unit I2-1 and an upper chord 1 in advance, and then assembling a transverse connection unit II 2-2, the problem of deformation of the transverse connection unit I2-1 is solved; and finally, the manufacturing process of the arc decorative plate 24 is adopted, so that the product quality is ensured, and the production efficiency is improved.
Through the above description, it can be found that: the invention produces the product with better quality without other excessive capital investment, and the technology has higher feasibility and can be popularized as experience.
In conclusion, the invention effectively prevents the deformation of the first transverse connection unit, ensures the product quality and improves the production efficiency; the method has the advantages of convenient production, safe construction, low construction difficulty, low requirement on site, resource investment saving, cost reduction and contribution to shortening the manufacturing period; the turnover is safe, the construction is efficient, and the process quality and the curve attractiveness are ensured; effectively improve the operating environment in the limited space, be favorable to smoke and dust and harmful gas to arrange fast and disperse, improve welding seam qualification rate and incasement coating quality, synthesize and improve production efficiency.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. The manufacturing method of the upper chord block body with the hollowed-out transverse connection is characterized in that: the upper chord block body, the lower chord (3) and the steel box girder (4) are integrally installed after the upper chord block body is integrally turned over, so that the upper chord block body is manufactured; before the upper chord block body is inverted, the transverse connection (2) is divided into a first transverse connection unit (2-1) and a second transverse connection unit (2-2) in advance; wherein the transverse connection unit I (2-1) is a deformable block; the transverse connection unit II (2-2) is a non-deformable block; assembling and welding the easily-deformed transverse connection unit I (2-1) and the upper chord (1) into a whole in advance, and then assembling the whole with the transverse connection unit II (2-2); and finally, installing the circular arc decorative plate (24) on the periphery of the transverse connection unit (2) on the assembled transverse connection unit I (2-1) and the assembled transverse connection unit II (2-2).
2. The method for manufacturing the upper chord block with the hollowed-out transverse connection as claimed in claim 1, is characterized by comprising the following steps:
s1, welding the first cross-link unit (2-1) of the cross-link (2) and the upper chord (1) into a whole and then placing the whole upside down on the special jig frame (5);
s2, inverting the transverse connection unit II (2-2) of the transverse connection (2) on the special jig frame (5) and welding the transverse connection unit II and the upper chord (1) into a whole;
s3, placing the other upper chord (1) on the symmetrical side upside down on the special jig frame (5) and welding the upper chord and the transverse unit II (2-2) into a whole;
s4, welding and detecting the butt weld of the first transverse connection unit (2-1) and the second transverse connection unit (2-2) to obtain an upper chord block;
s5, sanding and coating the manufactured upper chord block and the arc decorative plate (24) of the cross connection (2) to be assembled;
s6, installing the arc decorative plate (24) of the cross connection (2) on the upper chord block, and performing supplementary coating operation on the welding seam of the arc decorative plate (24) and the upper chord block;
s7, installing a monaural main hook (6) on one side of the upper chord block, and installing a binaural auxiliary hook (7) on the other side of the upper chord block; the lifting and descending of the single-lug main lifting hook (6) and the double-lug auxiliary lifting hook (7) are cooperatively operated by the gantry crane to complete the turning over of the upper chord block;
and S8, integrally mounting the turned upper chord block, the lower chord (3) and the steel box girder (4) to finish the manufacture of the upper chord block.
3. The method for manufacturing the upper chord block with the hollowed-out transverse connection as claimed in claim 1 or 2, wherein the method comprises the following steps: the special jig frame (5) consists of a plurality of support piers (51) and opposite-pulling screw rods (52); the support piers (51) are vertically and fixedly supported and installed on the ground and have different heights; the top ends of the support piers (51) with different heights are respectively provided with different cushion block support line shapes (511); the linear shape and the size of the cushion block supporting linear shape (511) are matched with the size of the surface undulation linear shape of the inverted upper chord block body.
4. The method for manufacturing the upper chord block with the hollowed-out transverse connection as claimed in claim 3, wherein the method comprises the following steps: the counter-pulling screw rod (52) consists of an internal thread sleeve (521), an adjusting screw rod (522) and a hook (523); the adjusting screw rod (522) is coaxially, rotatably and fittingly installed at two ends of the cylinder body of the internal thread sleeve (521), and the adjusting screw rod (522) is used for adjusting the extending length of the adjusting screw rod; the outer side of the extending end of the adjusting screw rod (522) is coaxially and fixedly connected with a handle part of the hook (523); the counter-pulling screw rod (52) is hooked with the transverse connection unit II (2-2) through a hook body of a hook (523) at one end of the counter-pulling screw rod; the counter-pulling screw rod (52) is hooked with the upper chord (1) through a hook body of a hook (523) at the other end of the counter-pulling screw rod.
5. The method for manufacturing the upper chord block with the hollowed-out transverse connection as claimed in claim 1 or 2, wherein the method comprises the following steps: the transverse connection (2) is formed by welding a transverse connection top plate (21), a transverse connection bottom plate (22), a middle partition plate (23) and an arc decorative plate (24); the transverse connection (2) is divided into a first transverse connection unit (2-1) and a second transverse connection unit (2-2); wherein the transverse connection unit I (2-1) is of a slender structure; the width of the narrowest part of the transverse connection unit I (2-1) is 200-400 mm.
6. The method for manufacturing the upper chord block with the hollowed-out transverse connection as claimed in claim 1, 2 or 4, wherein the method comprises the following steps: the second transverse connection unit (2-2) and the upper chord (1) are assembled and welded; the transverse connection unit II (2-2) is provided with a transverse connection clapboard (201) for manufacturing an accessible butt joint seam (202); the barrier-free butt seam (202) ends without a bulkhead projection (2011); and the barrier-free butt joint seam (202) is used for inserting the transverse connection unit II (2-2) into the inner side of the upper chord (1) in a clamping-stagnation-free horizontal pushing manner and is welded with the upper chord (1) into a whole.
7. The method for manufacturing an upper chord block with the hollowed-out transverse connection as claimed in claim 2, wherein in step S7: the single-lug main lifting hook (6) is fixedly arranged on the left outer side of the inverted and horizontally arranged upper chord block body; the double-lug auxiliary lifting hook (7) consists of an auxiliary lifting hook I (71) and an auxiliary lifting hook II (72); the auxiliary first lifting hook (71) is fixedly arranged on the right outer side of the inverted upper chord block body; the second auxiliary lifting hook (72) is fixedly arranged on the lower right side of the inverted upper chord block body; the auxiliary lifting hook I (71) and the auxiliary lifting hook II (72) are respectively composed of lifting lugs and auxiliary hooks;
when the turning-over is carried out in the step S7, the method comprises the following steps:
s701, the gantry crane drives the single-lug main lifting hook (6) to ascend on one hand and drives the auxiliary lifting hook I (71) to descend on the other hand, so that the inverted and horizontally arranged upper chord block body is driven to rotate clockwise;
s702, after the original inverted and horizontal upper chord block body is turned clockwise and changed into a vertical state, stopping the action of the portal crane, taking the auxiliary hook down from the lifting lug of the auxiliary lifting hook I (71), and replacing the auxiliary hook on the lifting lug of the auxiliary lifting hook II (72);
s703, the gantry crane is started again, the gantry crane drives the single-lug main lifting hook (6) to descend on one hand and drives the auxiliary lifting hook II (72) to lift on the other hand, so that the vertical upper chord block body is driven to continue to rotate clockwise until the gantry crane stops acting after the upper chord block body is overturned to a horizontal normal-position state;
and S704, after the upper chord block body, the lower chord (3) and the steel box girder (4) which are horizontally and vertically placed are integrally installed, the single-lug main lifting hook (6) and the double-lug auxiliary lifting hook (7) are detached.
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| CN202210700520.8A CN115041853B (en) | 2022-06-20 | 2022-06-20 | Method for manufacturing upper chord block with hollowed-out cross-section |
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| CN115041853B (en) | 2024-05-14 |
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