3, The rail girder installation requirements before laying the rails of gantry crane
3.1 The requirements for concrete rail girder
A, During the track beam production process, we must ensure that the reserved bolt hole location deviation along the horizontal and vertical directions≤5mm. The diameter of the bolt hole needs to be 2-7mm larger than that of the bolt. The top-surface of the beam should be smooth and not wiping with pressure.
B, The track beam misalignment must meet the following requirements, otherwise adjust the track beam before leveling with the concrete.box-girder gantry crane
a, The design positioning axle deviation of beam center≤5mm.
b, The elevation deviation of the top surface of the beam should be 10mm-5mm.
c, The displacement deviation of the reserved bolt hole and beam center≤5mm.
C, The construction requirements of the concrete leveling layer
a, The thickness of the concrete leveling layer is 30～50mm.
b, Examine the installation deviation of the track beam according to the requirements before constructing the concrete leveling layer. Adjust the track beam if there are some conditions not complying with the requirements.
c, According to the actual elevation height of the track beam surface, identify a suitable surface elevation height of the concrete leveling layer. Set up a reference point for controlling the elevation height every 2.4-3.0m along the track beam.
d, The surface of the leveling layer must be leveled and polished. Forbid having the phenomena of uneven stones and concave, not allow to leveling with the way of laying another layer of concrete.
e, Mixing the concrete with the mechanical facility. Do the maintenance while the construction. When the concrete block has approached 75% strength design value, then begin to install the rail.
3.2 The requirements of the steel track beam
A, The perpendicularity of cross-track beam≤h/500, h for the height of track beam
B, The lateral bending gradient of the track beam≤l/1500, and net 10mm, I for the length of the track beam
C, The arch in vertical direction of the track beam≤10mm.
D, The design positioning axle deviation of the track beam≤5mm, adjust the positioning before installation if there is something not comply with the requirements.
E, The top height difference within the same cross-section of a track beam at support≤10mm, others≤15m.
F, The top height difference between the adjacent track beam≤1mm, the central lateral dislocation≤3mm.
4, The width between the rails is decided by the span of the crane. The rail longitudinal slope is no more than 1%. Inspect the cart driven power and the overall stability if it has exceeded the above-mentioned value. If it doesn’t comply with the requirements, adjust the slope before putting it into use. Both sides of the rail require in the same level correspondingly, the joints are stable to make the crane travel smoothly. Equip the traveling limit switch on the both ends of the crane rail.