Installation requirements for rail beams of bridge cranes

Overhead crane is a kind of hoisting machinery installed on the upper part of the workshop, and its running track needs a track beam to bear the weight. When the track beam is installed, it needs to meet certain standards to avoid the inability to install the cart track in the later stage.

The user's workshop is generally built with two materials: concrete and steel structure. We will introduce the requirements of the two kinds of workshop structure track beams:

1. Requirements for concrete track beams

(1) The position deviation of the reserved bolt holes along the transverse and longitudinal directions of the beam must be guaranteed to be less than or equal to 5mm, the diameter of the bolt hole is 2-7mm larger than the diameter of the bolt, and the top surface of the beam must be flat, but not smooth.

(2) The installation deviation of the track beam must meet the following requirements, otherwise the track beam must be adjusted before it can be leveled with concrete.

①The deviation of the center position of the beam to the design positioning axis is less than or equal to 5mm.

②The deviation of the beam top elevation from the design elevation is +10mm-5mm.

③ The reserved bolt holes on the beam and the displacement deviation of the reserved bolts to the center of the beam are ≤5mm.

(3) Construction requirements for concrete leveling layer

①The strength grade of the concrete leveling layer is C30, and the thickness is 30-50mm.

②Before the construction of the concrete leveling layer, the installation deviation of the track beam should be checked as required. If it does not meet the requirements, the track beam should be adjusted. ③According to the measured elevation of the track beam surface, determine a suitable control elevation of the top surface of the concrete leveling layer, and set a reference point for the control elevation on the track beam every 214-310m.

④Measure with the instrument, adjust the elevation of the reference point, determine the reference line for the elevation of the top surface of the leveling layer, then install the template, remove the sundries on the top surface of the track beam and the bolt hole, and block the upper opening of the bolt hole and sprinkle water. Concrete can be poured when wet.

⑤ The top surface of the leveling layer must be leveled and calendered, and there must be no exposed stones and unevenness. It is not allowed to use the method of laying cement mortar on the surface for leveling.

⑥ The top surface of the leveling layer must meet the following requirements: the unlevelness of the top surface within the width of 400mm at the bolts is ≤5mm; the elevation difference of the top surface at any 610m long house bolts is ±3mm; The elevation difference of the top surface at the bolt is ±5m.

⑦Concrete is mechanically mixed, and maintenance should be strengthened during construction. When the concrete test block reaches 75% of the design strength of the design value, the track installation work can be carried out.

2 Requirements for steel structure track beams

(1) The mid-span verticality of the track beam is ≤ h/500, and h is the beam height of the track beam.

(2) The horizontal side bend of the track beam is less than or equal to 1/1500, and the net is 10mm, and l is the beam length of the track beam.

(3) The vertical arch of the track beam is less than or equal to 10mm.

(4) The deviation of the center position of the track beam from the design positioning axis is ≤5mm. If it does not meet the requirements, the track beam positioning should be adjusted before the track can be installed.

(5) The height difference of the top surface of the rail beam of the same cross-section within the same span is ≤10mm at the support, and ≤15m at other places.

(6) The height difference of the top surface of the track beam between two adjacent columns in the same row is ≤ l/1500, and ≯ 10mm, and l is the beam length of the track beam.

(7) At the joint of two adjacent rail beams, the height difference between the top surfaces of the two rail beams is less than or equal to 1mm, and the lateral dislocation of the center is less than or equal to 3mm.

The track beam is the basis for installing the crane track, which is related to the safe operation of the crane. Therefore, enterprises must manufacture and install track beams in strict accordance with the standards.