Construction of horizontal rail BMU

- Feb 10, 2020-

The track type window cleaner is connected to the building structural board through the track system, and the gauge is generally 0.8-4.0m. The two tracks can be set on one plane or not on the same plane. The track system consists of a base, a connector and a track. Before the structure is capped, the window cleaning machine base is poured. The height of the base should be more than 80mm higher than the roofing layer. The base is one every 1500 ~ 2500mm. The embedded part of the base consists of a 10 ~ 16mm thick embedded steel plate and 4 It consists of φ16 or φ20 anchor bolts. After the foundation is completed, all the embedded steel plates are adjusted to the same plane by adjusting the nuts on the embedded bolts. After the second grouting fills the gap, the embedded steel plates are fixed. Pressure plate) to fix the track on the embedded steel plate. The window cleaner track uses I-shaped steel or H-shaped steel. Generally, the track is directly welded to the embedded steel plate. After the track is installed, the base and the roof are unified for waterproofing.

When designing and installing the track system of the ordinary standard track window cleaner, the following points should be paid attention to:

① Consider the weight of each part of the window cleaner, the weight of the track, the counterweight, the lateral force caused by the operation and the force caused by the wind load;

② The design of the track foundation should conform to the building modulus and facilitate civil construction. Leave enough space for concrete pouring and vibration (such as pouring holes). When the wall is high, the track foundation should be properly raised to improve the track foundation the height of;

③ The support points of the track should not be too dense, and the spacing should not be less than 1.5m. Consider to simplify the track into simply supported beams at the maximum acting load between the support points. The deflection of the track should not exceed 1/500 of its span;

④ The design strength of track anchors and connection accessories should be able to withstand more than twice the rated load. The anchoring of embedded parts should meet the architectural design requirements. The track, connection accessories and anchors should be rust-proof and anti-corrosive. ⑤ Consider temperature changes. The impact of the thermal expansion and contraction of the track on the track connection point and the roofing device. The length of each track section is not greater than 9m, and the gap between expansion joints is not greater than 3mm. The position of the track expansion joint is staggered by more than 2000mm. In areas with large temperature differences, try to use small-section profiles as tracks to reduce the impact of temperature stress on track connection points and roofing devices;

⑥ The end of the track should be welded with a limit stop, the thickness of the stop is not less than 8mm, the width is not less than the width of the track, and the height should meet the requirements of the limit device, generally not less than 100mm;

⑦ When the track is outside the joint of the base, groove welding should be used. At the bottom of the track, a piece of galvanized steel with a length of not less than 200mm, a width of not less than the width of the track plus 20mm, and a thickness of not less than 12mm should be welded.