CN110104546B - Construction method for rigid legs of gantry crane - Google Patents
Construction method for rigid legs of gantry crane Download PDFInfo
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- CN110104546B CN110104546B CN201811550067.7A CN201811550067A CN110104546B CN 110104546 B CN110104546 B CN 110104546B CN 201811550067 A CN201811550067 A CN 201811550067A CN 110104546 B CN110104546 B CN 110104546B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C5/00—Base supporting structures with legs
- B66C5/02—Fixed or travelling bridges or gantries, i.e. elongated structures of inverted L or of inverted U shape or tripods
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
- Jib Cranes (AREA)
Abstract
The invention relates to a construction method of a gantry crane rigid leg, which is characterized in that a rigid leg structure is divided into an upright column structure and a fishtail beam structure, the upright column structure and the fishtail beam structure are respectively manufactured into middle components, the trimming amount of the upper opening of the upright column structure is confirmed according to the deflection angle size of a main beam and a rigid leg assembly during manufacturing, the two middle components are spliced, and finally a saddle is spliced and connected at the lower end of the fishtail beam structure to form the rigid leg. The invention has the advantages that: the construction method of the invention replaces the scheme of compensating the deflection amount of the rigid leg by adding the cushion plate between the rigid leg and the main beam during the high-altitude general assembly by determining the deflection amount of the upper mouth of the rigid leg of the gantry crane to compensate the deflection amount of the rigid leg during the high-altitude general assembly under the condition that the ground is in a horizontal state.
Description
Technical Field
The invention relates to the field of construction of gantry cranes, in particular to a method for constructing rigid legs of a gantry crane.
Background
The hoisting machine is a machine used for hoisting, transporting and installing materials, is closely related to our life, can reduce physical labor, improve working efficiency and realize the traditional and important auxiliary machine for safe production. With the rapid development of the ship and marine engineering industries, the demand for large gantry cranes is increasing day by day, and the gantry cranes and steel knots mainly comprise main beams, rigid legs and flexible legs.
Due to the difference of the rigid-flexible leg connection mode and the integral rigidity of the rigid-flexible legs, after the gantry crane is loaded, the rigid legs incline to the flexible leg side along with the reduction of the camber of the main beam. However, rigid leg design and calculation are based on the premise that the rigid leg is in a straight state, and the rigid leg cannot be modeled and calculated in an inclined state. In order to ensure that the actual loaded calculation models of the rigid legs are matched, a certain deflection amount is required to be outward from the rigid legs in a no-load state during design, which is equivalent to structural reverse deformation.
In the past, in order to correct the deflection, the rigid leg is adjusted to the design requirement through a cable wind inhaul cable when the main beam and the rigid leg are assembled, and then an inclined base plate is added between the main beam and the rigid leg connecting flange so as to compensate the gap generated between the flange and the main beam flange after the rigid leg is adjusted in angle. For example, in patent CN103204434A, a method for correcting and resetting a rigid leg of a gantry crane in a shipyard is mentioned, wherein the rigid leg of the gantry crane in the shipyard is connected with a main beam through a flange, and the method comprises: determining the deviation amount of a flange interface between the rigid leg and the main beam according to the deviation of the rigid leg; manufacturing an inclined gasket according to the deviation amount, wherein the thickness of the inclined gasket is reduced progressively along the direction of inserting into the flange interface gap; the two sides of the rigid leg are additionally provided with inhaul cables; removing the connecting bolts at the side to be opened of the flange connector; pulling the rigid legs using the pull cords to expand the flange interfaces to form a gap; and inserting the inclined gasket into the gap, and reinstalling a connecting bolt on the opening side of the flange interface. The invention has short construction period, low construction cost and simple operation.
The deviation rectifying scheme has the defects that the main beam needs to be hoisted aloft for a long time, the operation risk is high, and the construction cost is high.
Disclosure of Invention
The invention aims to provide a method for constructing rigid legs of a gantry crane, which can realize land leveling of high-altitude operation and reduce high risk and high cost brought by the high-altitude operation.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for constructing a rigid leg of a gantry crane has the innovation points that: the construction method comprises the following steps: the rigid leg structure is divided into a stand column structure and a fishtail beam structure, the stand column structure and the fishtail beam structure are manufactured into middle assemblies respectively, the trimming and cutting amount of the upper opening of the stand column structure is confirmed according to the deflection angle size of a main beam and the rigid leg assembly during manufacturing, the two middle assemblies are spliced, and finally a saddle is spliced and connected at the lower end of the fishtail beam structure to form the rigid leg.
Further, the construction method comprises the following steps in sequence:
a) manufacturing a rigid leg upright post structure: sequentially carrying out blanking, groove opening, jointed plate sheet manufacturing and small component manufacturing to form a component in the upright column box girder;
b) manufacturing a rigid leg fish tail beam structure: sequentially carrying out blanking, beam flange plate flatness inspection and correction, groove opening, jointed plate sheet manufacturing and small assembly manufacturing to form a fishtail beam middle assembly, and finally carrying out flange plate processing on the lower end of the fishtail beam;
c) assembling the rigid leg upright post and the cross beam: sequentially carrying out splicing site cleaning, jig arrangement and scribing, and hoisting of the rigid leg stand column and the cross beam, so that the components in the stand column box beam manufactured in the step a and the components in the fishtail cross beam in the step b are hoisted onto the jig, then, taking the flange surface processing datum line of the rigid leg cross beam as a reference, trimming the folding allowance of the butt joint of the components in the stand column box beam and the components in the fishtail cross beam, and then splicing the components in the stand column box beam and the components in the fishtail cross beam;
d) and (3) repairing and cutting the deflection angle size of the upper opening of the rigid leg stand column: confirming the inclined deflection amount of a component in the upright box girder according to the theoretical girder arch of the main girder, subtracting the deflection amount when the rigid legs are assembled from the deflection amount to obtain the final deflection angle trimming and cutting amount of the upper opening of the component in the upright box girder, calculating the theoretical deflection angle trimming and cutting amount to obtain the final deflection angle trimming and cutting amount when the rigid legs are in a horizontal state, pre-splicing the rigid leg section of the main girder and the component in the upright structure, and trimming and cutting the upper opening of the component in the upright structure according to the final deflection angle trimming and cutting amount;
e) manufacturing a connecting saddle: the central line of the beam is used as a reference, a length reference control line of the rigid leg is combined, a machining line for connecting the saddle is drawn, the saddle is machined and connected independently after being disassembled, and the components in the connecting saddle and the fishtail beam are spliced after machining is completed to form the rigid leg.
And step d, after the girder rigid leg section is manufactured and verified, the girder rigid leg section is adjusted to be horizontal, the intersection point of the upper surface of the lower wing plate of the girder and the track gauge line is set as a zero point, a girder zero point line perpendicular to the upper wing plate of the girder is drawn at the zero crossing point, and marking is carried out.
Further, in the step d, when the rigid leg is in a horizontal state, the relative state of the rigid leg section of the main beam, namely the difference A between the zero point and the splicing seam of the lower wing plate of the rigid leg section of the main beam, is calculated, so that the offset angle trimming amount after butt joint is obtained, and a numerical value is recorded.
Further, in the step d, before pre-assembly, the rigid legs are required to be in a horizontal state, the rigid leg sections of the main beams are transferred to an assembly site, and the main beams are turned over by 90 ︒, namely the butting flanges are in a vertical state.
Furthermore, in the step d, the rigid leg section of the main beam is shifted and placed with the assembling jig frame after being turned over, the vertical verticality of the flange of the rigid leg section of the main beam is adjusted, the difference value is 'deflection angle repairing and cutting amount', whether the deflection angle repairing and cutting amount meets the requirement is retested, and then the height position of the rigid leg section of the main beam is adjusted, so that the zero point and the zero point line of the rigid leg are on the same horizontal plane.
Furthermore, in the step d, after the size meets the requirement, the allowance at the upper end of the assembly in the upright column structure is marked and trimmed by taking the inspection line as a reference, and a groove is formed, so that the length of the rigid leg is ensured to meet the requirement of a drawing.
And step e, marking out a large base distance by taking the central line of the rigid leg as a reference, hoisting and spot-welding the connecting saddle for positioning, and marking out bolt holes on the assembly in the fishtail beam according to bolt holes on the connecting saddle.
Furthermore, in the step e, the connecting saddle is positioned and installed on the assembly in the fishtail beam by using a guide pin and is screwed by using a process bolt, an inner hole allowance line and a heavy pound plate thickness allowance line which are connected with a pin hole of the saddle and a bolt hole position line of a clamping shaft plate are drawn by taking the central line of the beam as a reference and combining a length reference control line of the rigid leg, and then the connecting saddle is detached and independently processed.
The invention has the advantages that: the construction method of the invention replaces the scheme of compensating the deflection amount of the rigid leg by adding the cushion plate between the rigid leg and the main beam during the high-altitude general assembly by determining the deflection amount of the upper mouth of the rigid leg of the gantry crane to compensate the deflection amount of the rigid leg during the high-altitude general assembly under the condition that the ground is in a horizontal state.
According to the total theoretical height of the rigid legs provided by design, a margin processing line of the lower parts of the rigid legs connected with the saddle is drawn by taking the rail distance zero line of the rigid legs as a reference, and then the rigid legs are detached and independently sent to a finishing workshop for processing, so that the overall processing size is ensured, and the processing cost is reduced compared with that of the whole outfield processing.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic external view of a rigid leg in the invention.
Fig. 2 shows the pre-assembled picture of the rigid leg and the rigid leg section of the main beam in the invention.
FIG. 3 is a view showing the processing of the saddle attached to the lower part of the rigid leg in the present invention.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
The method for constructing the rigid legs of the gantry crane is realized by the following steps:
step one, manufacturing a rigid leg upright post structure: and sequentially carrying out blanking, groove opening, jointed plate sheet manufacturing and small component manufacturing to form the assembly 1 in the upright post box girder.
And step two, manufacturing a rigid leg fish tail beam structure: sequentially carrying out blanking, beam flange plate flatness inspection and correction, groove opening, jointed plate sheet manufacturing and small component manufacturing to form a fishtail beam middle component 2, and finally carrying out flange plate processing at the lower end of the fishtail beam.
Thirdly, assembling the rigid leg upright post and the cross beam: the method comprises the following steps of sequentially cleaning a splicing site, arranging and scribing a jig frame, and hoisting a rigid leg stand column and a cross beam, so that a component 1 in a stand column box beam manufactured in the first step and a component 2 in a fishtail cross beam in the second step are hoisted to the jig frame, then, the flange surface processing datum line of the rigid leg cross beam is used as a reference, the closure allowance of the butt joint of the component 1 in the stand column box beam and the component 2 in the fishtail cross beam is repaired and cut, and then, the component 1 in the stand column box beam and the component 2 in the fishtail cross beam are spliced.
Fourthly, repairing and cutting the deflection angle size of the upper opening of the rigid leg stand column: confirming the inclined deflection amount of the components in the upright box girder according to the theoretical girder arch of the main girder, subtracting the deflection amount during rigid leg assembly from the deflection amount to obtain the final deflection repairing and cutting amount of the upper opening of the components in the upright box girder, calculating the relative state of the rigid leg sections of the main girder, namely the difference A between the zero point and the splicing seams of the lower wing plates of the rigid leg sections of the main girder when the rigid legs are in the horizontal state, thus obtaining the deflection repairing and cutting amount after butt joint and recording the numerical value, calculating the theoretical deflection repairing and cutting amount to obtain the final deflection repairing and cutting amount when the rigid legs are in the horizontal state, pre-splicing the rigid leg sections of the main girder and the components in the upright structure, and repairing and cutting the upper opening of the components in the upright structure according to the final deflection repairing and cutting amount.
In the steps, after the girder rigid leg section is manufactured and verified, the girder rigid leg section is adjusted to be horizontal, the intersection point of the upper surface of the lower wing plate of the girder and the track gauge line is set as a zero point, a girder zero point line perpendicular to the upper wing plate of the girder is drawn at the zero crossing point, and marking is carried out.
Before pre-splicing the components 1 in the upright column box girder and the components 2 in the fishtail beam, rigid legs are required to be ensured to be in a horizontal state, the rigid leg sections of the main girder are transferred to an assembly site, and the main girder is turned over by 90 ︒, namely the butt flange is in a vertical state.
And (3) shifting and placing an assembling jig frame after the rigid leg section of the main beam is turned over, adjusting the vertical verticality of a flange of the rigid leg section of the main beam, wherein the difference is the deflection angle repairing and cutting amount, re-measuring whether the deflection angle repairing and cutting amount meets the requirement, and then adjusting the height position of the rigid leg section of the main beam to enable the zero point and the zero point line of the rigid leg to be on the same horizontal plane.
After the size meets the requirement, the allowance at the upper end of the assembly in the upright column structure is marked and trimmed by taking the inspection line as a reference, a groove is formed, and the length of the rigid leg is required to meet the requirement of a drawing.
And fifthly, manufacturing a connecting saddle: the central line of the beam is used as a reference, a length reference control line of the rigid leg is combined, a machining line for connecting the saddle is drawn, the saddle is machined and connected independently after being disassembled, and the components in the connecting saddle and the fishtail beam are spliced after machining is completed to form the rigid leg.
In the steps, the central line of the rigid leg is taken as a reference, a large base distance is marked, the connecting saddle is hoisted and spot-welded for positioning, and bolt holes in the assembly in the fishtail beam are marked according to bolt holes in the connecting saddle.
The connecting saddle is positioned and installed on the assembly 2 in the fishtail beam by a guide pin and is screwed by a process bolt, an inner hole allowance line and a heavy plate thickness allowance line which are connected with a saddle pin shaft hole and a clamping shaft plate bolt hole position line are drawn by taking the central line of the beam as a reference and combining a length reference control line of a rigid leg, and then the connecting saddle is detached and then is separately processed and connected with the connecting saddle.
The construction method of the invention replaces the scheme of compensating the deflection amount of the rigid leg by adding the cushion plate between the rigid leg and the main beam during the high-altitude general assembly by determining the deflection amount of the upper mouth of the rigid leg of the gantry crane to compensate the deflection amount of the rigid leg during the high-altitude general assembly under the condition that the ground is in a horizontal state.
According to the total theoretical height of the rigid legs provided by design, a margin processing line of the lower parts of the rigid legs connected with the saddle is drawn by taking the rail distance zero line of the rigid legs as a reference, and then the rigid legs are detached and independently sent to a finishing workshop for processing, so that the overall processing size is ensured, and the processing cost is reduced compared with that of the whole outfield processing.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for constructing rigid legs of a gantry crane is characterized by comprising the following steps: the construction method comprises the following steps: dividing the rigid leg into a stand column structure and a fishtail beam structure, firstly manufacturing the stand column structure and the fishtail beam structure into middle components respectively, confirming the trimming and cutting amount of the upper opening of the stand column structure according to the deflection angle size of the main beam and the rigid leg assembly during manufacturing, splicing the two middle components, and finally splicing and connecting a saddle at the lower end of the fishtail beam structure to form the rigid leg; the construction method sequentially comprises the following steps:
a) manufacturing a rigid leg upright post structure: sequentially carrying out blanking, groove opening, jointed plate sheet manufacturing and small component manufacturing to form a component in the upright column box girder;
b) manufacturing a rigid leg fish tail beam structure: sequentially carrying out blanking, beam flange plate flatness inspection and correction, groove opening, jointed plate sheet manufacturing and small assembly manufacturing to form a fishtail beam middle assembly, and finally carrying out flange plate processing on the lower end of the fishtail beam;
c) the column structure of the rigid leg is assembled with the fishtail beam structure: sequentially carrying out splicing site cleaning, jig arrangement scribing and hoisting of a column structure and a fishtail beam structure of rigid legs, so that the components in the column box beam manufactured in the step a and the components in the fishtail beam manufactured in the step b are hoisted onto the jig, then trimming the folding allowance at the butt joint of the components in the column box beam and the components in the fishtail beam by taking the flange surface processing datum line of the fishtail beam structure as a reference, and then splicing the components in the column box beam and the components in the fishtail beam;
d) and (3) repairing and cutting the deflection angle size of the upper opening of the upright column structure of the rigid leg: confirming the inclined deflection amount of the components in the upright box girder according to the theoretical girder arch of the girder, subtracting the deflection amount of the rigid legs during final assembly from the deflection amount to obtain the final deflection trimming amount of the upper opening of the components in the upright box girder, calculating the theoretical deflection trimming amount to obtain the final deflection trimming amount of the rigid legs in the horizontal state, pre-splicing the rigid leg sections of the girder and the components in the upright box girder, and trimming the upper opening of the components in the upright box girder according to the final deflection trimming amount;
e) manufacturing a connecting saddle: the center line of the fishtail beam structure is used as a reference, a connection saddle machining line is marked by combining a length reference control line of the rigid leg, the connection saddle is machined independently after being disassembled, and the connection saddle is spliced with the assembly in the fishtail beam after machining is completed to form the rigid leg.
2. The method for constructing rigid legs of a gantry crane according to claim 1, wherein: and d, after the girder rigid leg section is manufactured and verified, the girder rigid leg section is adjusted to be horizontal, the intersection point of the upper surface of the lower wing plate of the girder and the track gauge line is set as a zero point, a girder zero point line perpendicular to the upper wing plate of the girder is drawn at the zero crossing point, and marking is carried out.
3. The method for constructing rigid legs of a gantry crane according to claim 1, wherein: in the step d, when the rigid legs are in a horizontal state, the relative state of the rigid leg sections of the main beam, namely the difference A between the zero point and the splicing seams of the lower wing plates of the rigid leg sections of the main beam is calculated, so that the offset angle trimming amount after butt joint is obtained, and the numerical value is recorded.
4. The method for constructing rigid legs of a gantry crane according to claim 1, wherein: in the step d, the rigid legs are ensured to be in a horizontal state before pre-assembly, the rigid leg sections of the main beams are transferred to an assembly site, and the main beams are turned over by 90 , namely the butting flanges are in a vertical state.
5. The method for constructing rigid legs of a gantry crane according to claim 1, wherein: and d, shifting and placing the assembling jig frame after the rigid leg section of the main beam is turned over, adjusting the vertical verticality of the flange of the rigid leg section of the main beam, wherein the difference is the deflection angle repairing and cutting amount, re-measuring whether the deflection angle repairing and cutting amount meets the requirement, and then adjusting the height position of the rigid leg section of the main beam to enable the zero point line and the zero point line of the rigid leg to be on the same horizontal plane.
6. The method for constructing rigid legs of a gantry crane according to claim 1, wherein: and d, after the size meets the requirement, marking and trimming the allowance at the upper end of the assembly in the upright box girder by taking the inspection line as a reference, and opening a groove to ensure that the length of the rigid leg meets the requirement of a drawing.
7. The method for constructing rigid legs of a gantry crane according to claim 1, wherein: and e, marking out a large base distance by taking the center line of the rigid leg as a reference, hoisting, spot-welding and positioning the connecting saddle, and marking out bolt holes in the assembly in the fishtail beam according to bolt holes in the connecting saddle.
8. The method for constructing rigid legs of a gantry crane according to claim 1, wherein: and e, positioning and installing the connecting saddle on the assembly in the fishtail beam by using a guide pin, screwing down the connecting saddle by using a process bolt, drawing an inner hole allowance line and a heavy scale plate thickness allowance line which are connected with a pin hole of the saddle and a clamping shaft plate bolt hole position line by using the structural center line of the fishtail beam as a reference and combining a length reference control line of a rigid leg, and then, detaching the connecting saddle and independently processing the connecting saddle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811550067.7A CN110104546B (en) | 2018-12-18 | 2018-12-18 | Construction method for rigid legs of gantry crane |
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| CN201811550067.7A CN110104546B (en) | 2018-12-18 | 2018-12-18 | Construction method for rigid legs of gantry crane |
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| CN110104546B true CN110104546B (en) | 2020-06-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8037658B2 (en) * | 2009-01-08 | 2011-10-18 | Kundel Industries, Inc. | Structural members for forming various composite structures |
| CN103359608A (en) * | 2012-03-28 | 2013-10-23 | 江苏华澄重工有限公司 | Y-shaped rigid leg for portal crane |
| CN108639945A (en) * | 2018-03-30 | 2018-10-12 | 南通振华重型装备制造有限公司 | A kind of Simple tyre hangs assembling process |
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