The installation of the crane end track has a direct impact on the operation of the crane and must be taken seriously. A common malfunction in crane operation is car gnawing rail, that is, the serious friction between the wheel flange and the rail side causes the flange to wear and deform quickly, causing serious wear on the side of the track head as well.There are many reasons for the rail gnawing on the rail, and the poor quality of the track laying is one of the important reasons for the direct impact of the rail gnawing on the rail.
The inspection of crane girder and the quality of the double beam crane beam are the basis for ensuring the quality of the track installation.The standard line for the installation of the general track is the baseline of the crane beam.Before the installation of the track, the crane beam must be carefully checked and the reference line of the crane beam can be released at the same time.This work can be measured by theodolite: one point is measured every 2~3m, and each point is measured at each column, so as to release the reference line and track of the crane beam and find the baseline.The distance between the two lines depends on the size of the track used.In addition, the level of the crane beam is measured by a leveling level, and one point is measured at each column.The quality of the crane beam should be in accordance with the regulations on the construction and acceptance of the reinforced concrete engineering.Several requirements are presented here for reference.
When checking the crane beam, we must ensure that the position deviation of the reserved bolt holes along the beam is less than or equal to 5mm, the allowance for the reserved hole to the two centerlines is 5mm, the diameter of the bolt hole is larger than the diameter of the bolt 5~7mm. Two, the deviation of the plane relative elevation on the crane beam should not exceed 10mm at the post, and the other places must not exceed 15mm. The top elevation of crane beam is 10mm–5mm for the design elevation.
The deviation of the position of the center line of the beam to the axis of the designed positioning must not be greater than 5mm.The size of the reference center line and the column side of each crane beam must conform to the following requirements:
- The weight is Q<=50t, and the size is b+60mm.
- When the weight is at 50t-100t, the size is b+100mm.The B is the distance between the center of the track and the outer end of the crane.
- The crane’s beam is <=2mm at the top of the bolt in the wide 400mm range, and the height difference of the top face of each bolt is 6m in any 6m length of the beam.
- The top face of each bolt is along the workshop floor length, and check whether the reserved hole is skewed or blocked.
- The concrete grouting layer (or leveling layer) between the concrete crane beam and the track should be in accordance with the design regulations.
The top surface of the crane beam should be washed clean before irrigation.After completion of inspection and completion of crane beam, the actual situation of crane beam should be checked, and the length of the processing part, especially the thread, should be put forward, and more careful verification is needed, so as not to affect the installation quality and engineering progress.
