CN116275649A - Manufacturing method of large box girder structure and assembling method of tire crane - Google Patents
Manufacturing method of large box girder structure and assembling method of tire crane Download PDFInfo
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- CN116275649A CN116275649A CN202310252118.2A CN202310252118A CN116275649A CN 116275649 A CN116275649 A CN 116275649A CN 202310252118 A CN202310252118 A CN 202310252118A CN 116275649 A CN116275649 A CN 116275649A
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- box girder
- saddle
- girder structure
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000003466 welding Methods 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013102 re-test Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
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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
-
- 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
Abstract
The invention provides a manufacturing method of a large box girder structure and an assembling method of a tire crane, wherein the manufacturing method comprises the steps of assembling a top plate, a bottom plate and two webs into a pre-box girder structure; the positions of the top plate, the bottom plate and the two webs are preset by spot welding; measuring the perpendicularity and the torsion degree of the pre-box girder structure; when the measurement result of the pre-box girder structure is within a preset range, fixing the positions of the top plate, the bottom plate and the two webs in a continuous welding mode to form the box girder structure, wherein the box girder structure at least comprises saddle girders and supporting legs. According to the manufacturing method provided by the embodiment of the invention, the four-side steel plates are pre-fixed through spot welding, so that the large deviation of the central line during splicing is avoided, the perpendicularity and the torsion resistance of each panel of the box girder structure are ensured, and the manufacturing precision of the large-scale box girder structure is improved.
Description
Technical Field
The invention relates to the field of manufacturing of tire cranes, in particular to a manufacturing method of a large box girder structure and an assembling method of a tire crane.
Background
The tyre crane is usually in the form of a self-propelled load-carrying trolley and a counterweight container sling, and is used for the piling operation of a container yard. The tyre crane generally adopts a diesel engine to drive a generator set as power, can be intelligently connected into a slide groove to carry out electricity taking driving operation by adopting commercial power, is mainly used for freely moving in a container yard of a wharf, and is not influenced by a towing cable and an external power supply.
Because the span of the tire crane is tens of meters away, the saddle beam, the supporting leg and other components assembled to form the tire crane have the same large volume. The components such as saddle beam transporting support legs are box beam structures, and long steel plates are easy to generate distortion in the process of forming the box beam structures, so that the assembly effect of the box beam structures is affected.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for manufacturing a large-sized girder structure and a method for assembling a tire crane.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, according to an embodiment of the present invention, a method for manufacturing a large girder construction including saddle girders or support legs includes:
assembling a top plate, a bottom plate and two webs to form a pre-box girder structure;
the positions of the top plate, the bottom plate and the two webs are preset by spot welding;
measuring the perpendicularity and the torsion degree of the pre-box girder structure;
when the measurement result of the pre-box girder structure is within a preset range, fixing the positions of the top plate, the bottom plate and the two webs in a continuous welding mode to form the box girder structure.
Further, assemble roof, bottom plate and two webs into the structure of pre-box girder, include:
placing the top plate, the bottom plate and the two webs on a jig frame;
reinforcing plates are added at two ends of the jig frame;
and fixing the bottom plate and the jig frame by using a code plate.
Further, assemble roof, bottom plate and two webs into the structure of pre-box girder, still include:
and adding allowance to the lengths of the top plate, the bottom plate and the two webs.
In a second aspect, an embodiment of the present invention further provides a method for assembling a tire crane, the method including:
arranging a jig frame;
arranging two saddle beams on the jig frame;
hoisting a portal frame to the saddle beam for assembly, wherein the portal frame comprises supporting legs and a girder;
hoisting a trolley track, an electric room and a power room;
hoisting the portal frame and arranging a cart to walk;
and hoisting the trolley frame assembly and installing accessories.
Further, the arranging the jig frame includes:
drawing a ground cross center line by using a laser theodolite and taking the ground cross center line as a reference;
and drawing the center line of the saddle Liang Kaidang, the center line of the saddle beam and the cart hole and the jig frame arrangement line.
Further, arranging two saddle beams onto the jig frame includes:
disposing the saddle beam to the jig frame based on the jig frame disposing line;
and adjusting the horizontal central lines of the two saddle beams and enabling the two saddle beams to be positioned on the same horizontal plane.
Further, hoisting the portal frame to the saddle beam part for assembly comprises:
fixing the supporting legs by using a wave wind steel wire rope;
calibrating the perpendicularity of the portal frame by utilizing laser matched with a chain block;
matching the portal frame with the saddle beam by using a guide plate;
adjusting each dimension parameter of the portal frame by utilizing the wind-wave steel wire rope and the chain block so that the intersection points of the center lines of the supporting legs are positioned in the same plane;
and welding the lower opening of the supporting leg and the saddle beam.
Further, hoisting the portal frame to the saddle beam part for assembly further comprises:
and the stay bars are connected between the two supporting legs in a hoisting mode and fixed, and the stay bars are parallel to the saddle beam.
Further, before the portal frame is hoisted to the saddle beam for assembly, the method comprises the following steps:
assembling the cart ear plate on the saddle beam;
in assembling the lug plate on the saddle beam, the method comprises the following steps:
and the technological support is utilized to enlarge the opening assembly size of the large car ear plate.
Further, hoist and mount the portal frame and arrange the cart to walk, include:
drawing a tire crane base distance and a wheel distance by taking the ground cross center line as a reference;
and arranging the cart to walk by using a forklift based on the base distance and the wheel distance of the tire crane, and enabling the axle hole opening size of the cart balance beam to be matched with the saddle beam end opening size.
The technical scheme of the invention has at least one of the following beneficial effects:
according to the manufacturing method of the large box girder structure, disclosed by the invention, the large deviation of the central line during splicing is avoided by the mode of pre-fixing the four-side steel plates through spot welding, the perpendicularity and the torsion degree of each panel of the box girder structure are ensured, and the manufacturing precision of the large box girder structure is improved.
Drawings
Fig. 1 is an overall flow diagram of a method for manufacturing a large-scale girder structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of saddle beam manufacturing in a method for manufacturing a large box beam structure according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of adding allowance to a supporting leg in a method for manufacturing a large box girder structure according to an embodiment of the present invention;
fig. 4 is an overall flow diagram of an assembly method of a tire crane according to an embodiment of the present invention;
FIG. 5 is another overall flow diagram of an assembly method of a tire crane according to an embodiment of the present invention;
FIG. 6 is a schematic view of an arrangement jig frame in a method of assembling a tire crane according to an embodiment of the present invention;
fig. 7 is a schematic view of a gantry frame installed in an assembly method of a tire crane according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a power house and an electrical house installed in an assembly method of a tire crane according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an assembled cart crane in an assembly method of a tire crane according to an embodiment of the present invention;
FIG. 10 is a schematic view of a lifting trolley frame assembly in a method of assembling a tire crane according to an embodiment of the present invention;
FIG. 11 is a right side view of a tire crane assembled using the provided method of assembling a tire crane according to an embodiment of the present invention;
FIG. 12 is a front view of a tire crane assembled using the method of assembling a tire crane provided in accordance with an embodiment of the present invention;
fig. 13 is a left side view of a tire crane assembled by the method for assembling a tire crane according to an embodiment of the invention.
Reference numerals:
a. the center line of the cart hole is turned; b. a ground cross center line;
10. a saddle beam; 20. rib plates; 30. a support leg; 30a, saddle beam end allowance; 30b, girder end allowance; 40. a wind rope; 50. a power house; 60. an electrical room; 70. the cart walks; 80. a trolley frame; 90. and a girder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
The large box girder structure is hollow, and is similar to a box, such as a large box girder structure supporting leg, a saddle girder and the like. In the prior art, three faces are welded firstly for assembling a large-sized box girder structure, and finally the last face is welded, so that the perpendicularity and the torsion resistance of each panel of the box girder structure cannot be guaranteed in the installation process.
In view of the above technical problems, the embodiment of the invention provides a manufacturing method of a large-sized box girder structure, which is characterized in that four panels of the box girder structure are initially positioned in a spot welding mode, and after each parameter of the box girder structure is measured, the box girder structure is continuously welded to ensure the perpendicularity, the torsion degree, the flatness and the like of each panel of the box girder structure, so that the manufacturing precision of the box girder structure is further improved.
A method for manufacturing a large girder structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Specifically, as shown in fig. 1, in the method for manufacturing a large box girder structure according to the embodiment of the present invention, the box girder structure includes a saddle girder 10 or a supporting leg 30, the supporting leg 30 and the saddle girder 10 in the tire crane are both box girder structures, and the manufacturing of the supporting leg 30 and the saddle girder 10 is suitable for the above steps. Of course, the above manufacturing method may also be applied to other components in the tyre crane, such as: longerons 90, crossbars, etc. The method comprises the following steps:
s10, assembling the top plate, the bottom plate and the two webs into a pre-box girder structure.
That is, the relative positions of the top plate, the bottom plate and the two webs are put in place to present a pre-box girder structure.
In one embodiment, as shown in fig. 2, step S10 further includes:
the top plate, bottom plate and two webs are placed on a jig frame.
Reinforcing plates 20 are added to two ends of the jig frame.
And fixing the bottom plate and the jig frame by using a code plate.
According to the embodiment of the invention, the rib plates 20 and the stacking plates are added at the two ends of the jig frame, so that the stability and the firmness of the box girder structure in the manufacturing process are improved, and the manufacturing precision of the box girder structure is further improved.
In an embodiment, step S10 further includes:
and adding allowance to the lengths of the top plate, the bottom plate and the two webs.
After the splicing and welding of the lug plates of the saddle beam 10 and the large car are completed, the web plate contracts inwards to deform so as to influence the overall opening size. Based on this, the surplus is placed to the web upper shed during unloading, and the web concatenation is accomplished the back upper shed surplus and is taken out the limit, and length direction car otic placode central length adds the surplus, and the overall length increases, and length lower shed both ends respectively increase the surplus to guarantee the whole size of opening of web, further guarantee landing leg 30 and saddle roof beam 10 when the concatenation, both ends top panel scope can guarantee the roughness.
As shown in fig. 3, when the panel web of the supporting leg 30 is blanked, the upper opening needs to be provided with a trimming allowance, namely the girder 90 end allowance 30b, and the lower opening needs to be provided with a trimming allowance, namely the saddle girder end allowance 30a, and the problem of out-of-tolerance gap of the upper opening of the supporting leg 30 is avoided when the outer door frame is assembled.
S20, the positions of the top plate, the bottom plate and the two webs are preset through spot welding.
The spot welding mode is used for initially positioning the positions of the top plate, the bottom plate and the two webs, namely the relative positions of the top plate, the bottom plate and the two webs can be changed.
S30, measuring the perpendicularity and the torsion resistance of the pre-box girder structure.
And when the measurement of parameters such as verticality, torsion resistance, flatness and the like of the pre-box girder structure is unqualified, returning to the step S20 to readjust the relative positions of the top plate, the bottom plate and the two webs, and performing primary positioning again by utilizing a spot welding mode.
And S40, fixing the positions of the top plate, the bottom plate and the two webs in a continuous welding mode when the measurement result of the pre-box girder structure is within a preset range, so as to form the box girder structure.
When the measurement result in step S30 is within the preset range, that is, if the measurement result is qualified, the positions of the top plate, the bottom plate and the two webs are fixed by continuous welding, and after continuous welding, the positions of the bottom plate, the top plate and the two webs cannot be changed.
In one embodiment, the method further comprises the step of manufacturing the trolley frame 80, wherein after the trolley frame 80 is assembled by a mechanism, the girder 90I-steel is wound in the presence of the girder 90I-steel, and the girder 90I-steel is required to be placed with a pre-arch during manufacturing, and the girder 90 is placed with the pre-arch by the mechanism. After the auxiliary mechanism base is prefabricated into the assembly, the small flange surface is integrally machined and then is installed with the trolley frame 80, so that the angle and the flatness of the auxiliary mechanism base are ensured.
As shown in fig. 11 to 13, the tire crane includes saddle beam 10, leg 30, girder 90, cart 70, power house 50, electric house 60, and the like.
The embodiment of the invention also provides an assembling method of the tyre crane, as shown in fig. 4 and 5, the method comprises the following steps:
s1, arranging a jig frame.
The portal frame steel structure is manufactured by a split type manufacturing technology, namely, each section of structural member is manufactured in a workshop, and then each manufactured structural member is reassembled, so that the construction period is shortened, the utilization rate of the workshop is improved, and meanwhile, the production and manufacturing cost is reduced.
When the portal frame steel structure is assembled, the jig frame is arranged firstly, as shown in fig. 6, and the method specifically comprises the following steps:
the laser theodolite is used for drawing a ground cross center line b and taking the ground cross center line b as a reference.
And drawing a center line of the saddle beam 10, a center line a of the saddle beam 10 and the cart hole and a layout line of the jig frame.
And S2, arranging two saddle beams 10 on the jig frame.
The center line of the saddle beam 10 is aligned by taking the ground cross center line b as a reference, two saddle beams 10 are respectively arranged on the jig frame, the horizontal center lines of the two saddle beams 10 are positioned on the same horizontal plane, the whole horizontal of the saddle beams 10 is ensured, and the track gauge opening size and the diagonal line size tolerance are detected.
S3, hoisting a portal frame to the saddle beam 10 for assembly, wherein the portal frame comprises supporting legs 30 and a girder 90.
The leg 30 is assembled with the girder 90 to form the portal frame prior to lifting the portal frame. The method specifically comprises the following steps:
the legs 30 are secured with a corrugated steel cable.
And calibrating the perpendicularity of the portal frame by utilizing laser matched with a chain block.
The portal frame is matched to the saddle beam 10 by a guide plate.
And adjusting each dimension parameter of the portal frame by utilizing the wind-wave steel wire rope and the chain block so that the intersection points of the central lines of the supporting legs 30 are positioned in the same plane.
The lower opening of the leg 30 is welded to the saddle beam 10.
That is, as shown in fig. 7, the door frame on the side of the drag chain is lifted to the saddle beam 10 by the door machine, the guide plates are aligned, the lang wire rope is pulled, the door frame verticality is aligned by the laser matching with the chain block, and the lang wire 40 is tightened. And then the non-drag chain side door frame is moved to the position of the saddle beam 10, and the guide plate is aligned. The opening sizes of the two door frames, the opening and horizontal size, the diagonal size and the like of the main girder rail are detected, and the adjustment is carried out by utilizing the wave ropes 40 and matching with the chain block.
And measuring and adjusting the sizes of the portal frames, and ensuring that the zero points around the main beam, namely the intersection points of the central lines of the supporting legs 30, are in the same plane, wherein the lower openings of the supporting legs 30 are aligned with the inner ribs of the saddle beam 10. And the welding seam between the lower opening of the supporting leg 30 and the saddle beam 10 is completed, and the welding is sequentially carried out from inside to outside.
Further, the supporting rods are connected with the supporting legs 30 by using the automobile crane, the pin shafts are penetrated, the bolts are screwed, and finally the trolley rails are hoisted by using the automobile crane and are arranged in place side by side.
In one embodiment, the method further comprises the following steps before step S3:
the lug plate is fitted to the saddle beam 10.
In assembling the lug plate to the saddle beam 10, the method comprises the following steps:
and the technological support is utilized to enlarge the opening assembly size of the large car ear plate.
That is, when the large car ear plate is assembled, the technological support is utilized to enlarge the assembly size of the open gear, the open gear size on the drawing is ensured after welding, and the assembly precision is improved.
S4, lifting trolley tracks, an electric room 60 and a power room 50.
As shown in fig. 8, the support of the retest electric room 60 and the power room 50 is provided with a shear block opening and an angle square, and the underframe of the retest electric room 60 and the power room 50 are correspondingly connected with the opening and the angle square. The electric room 60 and the power room 50 are respectively hoisted in place by using an automobile crane. Finally, installing a ladder platform inclined ladder and a platform, wherein the installation of the platform above the electric room 60 takes the pin shaft end as a reference, and the installation of the other end waist-shaped hole is positioned according to the actual length dimension of the platform; after the electric room 60 and the power room 50 anti-collision frames are installed and the auxiliary parts are installed in place, the relevant dimensions are measured.
S5, hoisting the portal frame and arranging a cart to walk 70.
Drawing a tire crane base distance and a wheel distance by taking a ground cross center line b as a reference;
and arranging the cart travel 70 based on the base distance and the wheel distance of the tire crane by using a forklift, and enabling the axle hole opening size of the cart balance beam to be matched with the end opening size of the saddle beam 10.
That is, as shown in fig. 9, four groups of cart cranes are arranged in size by using a forklift, and the carts are adjusted to ensure that the flatness of the holes of the torn cart shafts is within a preset range, and the four groups of cart cranes are measured and adjusted to meet the tolerance requirements of the wheel base and the base, and the diagonal dimension is within a specified range. And the straightness of the cart is also measured, the integral straightness of the single cart is required to be controlled within a preset range, and the gear opening size of the axle hole of the cart balance beam is ensured to be matched with the gear opening of the end of the saddle beam 10.
S6, lifting the trolley frame 80 assembly and installing accessories.
Specifically, as shown in fig. 10, the ladder platform, the mechanisms, etc. are first assembled, and the electric cables, parts, hydraulic lubrication lines and parts are mounted to the trolley frame 80 to minimize overhead operations. And hoisting the trolley assembly to the trolley track by using a gantry crane, placing a main beam middle position, namely a trolley anchoring position, and adjusting, aligning and overlapping the center lines of the trolley and the track to enable the trolley to fall down. The trolley is fixed by using a steel wire rope, a hoist and the like. Mounting other accessories, such as: an exhaust system, an oil tank pipeline system, a boarding ladder, tire pressure monitoring, an antenna and other accessories.
In the above assembling method, the respective members of the tire crane are assembled in order to form the tire crane shown in fig. 11 to 13. The assembling method changes the conventional manufacturing and assembling method in a breakthrough way, improves the production and manufacturing efficiency, and further improves the assembling precision of the tire crane.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A method of making a large box girder construction comprising saddle girders or legs, the method comprising:
assembling a top plate, a bottom plate and two webs to form a pre-box girder structure;
the positions of the top plate, the bottom plate and the two webs are preset by spot welding;
measuring the perpendicularity and the torsion degree of the pre-box girder structure;
when the measurement result of the pre-box girder structure is within a preset range, fixing the positions of the top plate, the bottom plate and the two webs in a continuous welding mode to form the box girder structure.
2. The method of claim 1, wherein assembling the top plate, the bottom plate, and the two webs in a pre-box girder structure comprises:
placing the top plate, the bottom plate and the two webs on a jig frame;
reinforcing plates are added at two ends of the jig frame;
and fixing the bottom plate and the jig frame by using a code plate.
3. The method of claim 1 or 2, wherein assembling the top plate, the bottom plate, and the two webs in a pre-box girder structure further comprises:
and adding allowance to the lengths of the top plate, the bottom plate and the two webs.
4. A method of assembling a tire crane, the method comprising:
arranging a jig frame;
arranging two saddle beams on the jig frame;
hoisting a portal frame to the saddle beam for assembly, wherein the portal frame comprises supporting legs and a girder;
hoisting a trolley track, an electric room and a power room;
hoisting the portal frame and arranging a cart to walk;
and hoisting the trolley frame assembly and installing accessories.
5. The method of claim 4, wherein arranging the jig frame comprises:
drawing a ground cross center line by using a laser theodolite and taking the ground cross center line as a reference;
and drawing the center line of the saddle Liang Kaidang, the center line of the saddle beam and the cart hole and the jig frame arrangement line.
6. The method of claim 5, wherein disposing two of the saddle beams onto the jig frame comprises:
disposing the saddle beam to the jig frame based on the jig frame disposing line;
and adjusting the horizontal central lines of the two saddle beams and enabling the two saddle beams to be positioned on the same horizontal plane.
7. The method of claim 4, wherein the step of installing the portal frame to the saddle beam comprises:
fixing the supporting legs by using a wave wind steel wire rope;
calibrating the perpendicularity of the portal frame by utilizing laser matched with a chain block;
matching the portal frame with the saddle beam by using a guide plate;
adjusting each dimension parameter of the portal frame by utilizing the wind-wave steel wire rope and the chain block so that the intersection points of the center lines of the supporting legs are positioned in the same plane;
and welding the lower opening of the supporting leg and the saddle beam.
8. The method of claim 7, wherein the step of installing the gantry frame to the saddle beam further comprises:
and the stay bars are connected between the two supporting legs in a hoisting mode and fixed, and the stay bars are parallel to the saddle beam.
9. The method of claim 4, comprising, prior to assembling the gantry frame to the saddle beam:
assembling the cart ear plate on the saddle beam;
in assembling the lug plate on the saddle beam, the method comprises the following steps:
and the technological support is utilized to enlarge the opening assembly size of the large car ear plate.
10. The method of claim 5, wherein lifting the gantry and arranging cart walks comprises:
drawing a tire crane base distance and a wheel distance by taking the ground cross center line as a reference;
and arranging the cart to walk by using a forklift based on the base distance and the wheel distance of the tire crane, and enabling the axle hole opening size of the cart balance beam to be matched with the saddle beam end opening size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310252118.2A CN116275649A (en) | 2023-03-14 | 2023-03-14 | Manufacturing method of large box girder structure and assembling method of tire crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310252118.2A CN116275649A (en) | 2023-03-14 | 2023-03-14 | Manufacturing method of large box girder structure and assembling method of tire crane |
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| CN116275649A true CN116275649A (en) | 2023-06-23 |
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| CN202310252118.2A Pending CN116275649A (en) | 2023-03-14 | 2023-03-14 | Manufacturing method of large box girder structure and assembling method of tire crane |
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- 2023-03-14 CN CN202310252118.2A patent/CN116275649A/en active Pending
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