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Hunan International Convention and Exhibition Centre roof project hoisting steel arch


Abstract: the construction of five projects in the Hunan International Convention and Exhibition Center giant space truss roof construction management, the use of on-site assembly,[link widoczny dla zalogowanych], multi-machine lifting crane, aerial docking and other technology, has successfully completed a large span, large tonnage roof arch construction. Keywords: steel pipe arch assembly upper docking site purlin frame <P class=MsoNormal style=: 21pt Edge design projects, while construction, to the construction difficult, and the narrow construction site, component assembly and lifting operations side is small, you can only assemble a Pin Arch. <B style= <P class=MsoNormal style=frame of the bar all in the factory cutting, simmer bending, rust, a painting, parts transportation to the construction site, assembled in the field, assembly, welding, and the second coating. <P class=MsoNormal style=cross-section, requiring at least every two chords over 300mm staggered, and sub-points does not allow the wall at different place, stitching seam welding with CO2 gas. <P class=MsoNormal style=to consider the pre-bagging arch height, arch height weight pre-bagging under the deflection caused by the reverse deformation, camber values ​​are as follows: <P class=MsoNormal style== MsoNormal style = 0 L/400 ~ L/200 <P class=MsoBodyTextIndent2 style=No physical layout material → → → lofting butt weld groove butt joint welding process → → → simmer NDT Inspection → Members → bend logo. <P class=MsoNormal style=Welding rod length contraction determined by experiment. cutting machinery: imports of CNC cutting machine saddle; workflow: Set the computer to prepare → → material is processed into the chuck of the clamping operation → → → zero return for select cutting mode → processing → cutting → test → correction. major equipment: IF simmer bending machine; processes: computer material is processed into ready → → Clamp Operating frequency heating → → → calibration curve simmer → cooling → Remove workpiece. simmer bend, the heating temperature should be controlled at 900 ° C ~ 1000 ° C between 800 ° C before the temperature dropped, should end processing and slow cooling. <P class=MsoNormal style=south. The main arch and the pole purlin transported to the scene, can be assembled, the main arch pre-assembled to fight the whole division, sub-welding, staging and loading, the overall corrected welded in place. <P class=MsoNormal style=assembly process to prevent the deformation of foundation, assembled before the foundation laid in the pivot position box, and then assembled with the mold line 18 of I-beam welding. Tire rack done, the overall shape measurement based on the chord to put away like the tire rack, tires will be placed in sub-shelf bar code by making assembled into a whole. <P class=MsoNormal style=braces. <P class=MsoNormal style= <B style= <P class=MsoNormal style=, and between the EF-axis of the arrangement between the QR axle of a 150t crane, building temporary roads and north of the south side of the layout of a 48.0m platform 136t crane, to meet the lower steel arch steel frame and roof The lifting frame structure needs. <P class=MsoNormal style=Taking into account the tonnage of the crane lifting is not enough, before lifting the same time due to arching, not poured concrete platform panel, arch assembly in the 12m platform, too difficult, so choose sub-lifting method. With M900 or 136 tons truck crane crane lifting stand-alone, sub-re not excessive or M900 case of arm length 136 tons truck crane or crawler crane 150t Dual Lift way. To reduce the error accumulation and the temperature difference between the adverse effects of lifting from the middle, symmetrical to both sides of the hoisting. <P class=MsoNormal style=WJ5 fixed hoisting needs, from the 12m platform to provide temporary support. Lifting frame and purlins to be completed arch, arch sections after welding so that even as a whole and fixed rear arch Pin removal of temporary support. For installation height is too high arch, choose the larger cross section of the temporary support to increase the stiffness, in order to facilitate the overall stability of the arch, as well as cost savings, reduced investment, the use of C, square columns for the temporary support arch. Location of temporary support setting steel columns in the top layer of ± 0.00m, to ensure that the weight of sub-arch to pass through the platform to the foundation of reliable column. Capitals with a layer of temporary support platform for welding, and welding in the support column, the temporary operating platforms.

<B style=frame lifting <? xml: namespace prefix = o ns = TEXT-INDENT: 21pt Shengjia down the chain of temporary fixed. <P class=MsoNormal style=adjacent to the main frame and steel arch with a purlin purlin connection, can the steel columns supporting the formation of space and the lower rigid unit. Single specimens of the main arch in place can not be stable. Therefore, the first specimens of the crane in lifting the temporary fixed-arch place, it should be followed by a second arch Pin lifting. Wind cable wire should be based on the length of the main arch to consider each set Pin 5 groups, each spaced about 25m, wind cable wire and the ground angle less than 45 degrees, wind cable rope with wire rope, cable each end of the wind near the ground with a rope 5 T down chain link wind cable wire in each arch bilaterally symmetrical setting, adjustable top and bottom chords of the main arch down and maintain the arch of the vertical degree of stability. <P class=MsoBodyTextIndent style= <P class=MsoBodyTextIndent style=welding using steel from the capitals and in the platform supporting the side of a safety railing, platforms, laying of steel springboard. <P class=MsoBodyTextIndent style=way connected to the side of the interface tube, fixture design three pieces of each interface, under the uniform semi-circular range of steel tube, removal of removal of weld used gas cutting and grinding with a grinding wheel machine level. <P class=MsoBodyTextIndent style=the level of support the main components. When the installation of two adjacent arch Pin in place, before the installation of the purlin frame, so the purlin frame joints and arches to be in the air. Lifting equipment using M900 walking tower crane. <P class=MsoBodyTextIndent style=, arch in place, because of chord prominent part of the block, purlin frame can not be suspended from the vertical direction in, so the first purlin frame side of the cut end of the first bar, the length is not less than 300mm, the length of the purlin frame chord direction 50-100mm reserve margin, adjust the gap as the installation, through built-in casing and chord fillet weld connections. Casing diameter slightly smaller than the chord diameter 2-3mm. However, to ensure the chord wall thickness greater than the joint stiffness. Adjust the rack bar through the purlin purlin frame to shorten the overall length of the margin, the overall lifting purlin frame installation position and be fixed to the side port, moving the regulating side cut to the appropriate location of both ends of the welding head fixed. Adjusted according to actual space, using the same chord diameter tube made of two semi-circular, closure and post-welding grinding flat weld reinforcement, touch-up painting to ensure the quality of joints and joint appearance play a strengthened role. <P class=MsoBodyTextIndent style=WJ5 Each Pin in the north, south and central parts of the three tree-based support, support for each tree tree by the four pieces and a solid supporting bar connected or hinged together constitute the bearing. The largest pieces of the tree supporting bar length of about 11m (WJ3 C bearing). If the tree support and installation of the main arch in two, will inevitably increase the difficulty of air interface, and installation quality is difficult to guarantee. For ease of installation quality control and reduce the interface to the difficulty of the main arch in the assembly tree when the main arch support and sub-assembly together, the overall shape of the formation of and the difficulty of the secondary out of luck. <P class=MsoBodyTextIndent style=normal Daily must wind the rope in good condition for examination, identify problems and must timely manner. <P class=MsoBodyTextIndent style=. <P class=MsoBodyTextIndent style=the evening is not lifting. <P class=MsoBodyTextIndent style=. <P class=MsoBodyTextIndent style=rope off shares or defect. <P class=MsoBodyTextIndent style=good fence, lay the safety rope, steel springboard to be tied securely.