Another type of movement for equipment in a mezzanine floor factory is the movement that affects the crane rail laterally.
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The first type of movement is side deflection of the crane rail This type of deflection is limited to Span length divided by 400 to avoid noticeable lateral deflection. weight considerations The load in this case will be the lateral force exerted by the crane. The second type of movement is relative motion on the side of the support point which must be controlled to prevent the crane rails from moving apart or moving with the support point. By controlling this, it prevents the castor from derailing or the cantilever wing from occurring. Interfering with the crane rail as well.
After the crane rail is installed, it will cause the load to be transferred into the structure, which will cause the load to move in or out of the support point. Most of the support points are generated by the weight of the crane. Outward movement part of the support point will be caused by the load on the roof that has to bear a lot of weight from the snow, which in this case does not have to taken into account in Thailand Control of inward motion can be achieved by positioning and proportioning the wheel flange spacing, which generally controls inward motion of the support to a value of less than 1.27 cm (1 /2 inches) and should be coordinated with the crane supplier for accuracy as well.
A cantilever crane is usually attached to a building’s structural column. The main thing to consider is the deflection at the overhang of the crane so that there is not too much deflection. which will cause the scrolling of the pulley set is difficult to slide back into the pole position This deflection is considered to be the sum of the outstretched arms from the crane plus the cross-section of the mast due to the applied force. whereby the limit of deflection at the maximum overhang should be Not more than the length of the extended arm divided by 225. In addition, the additional consideration is When Sen changes position Going in the direction of the soft axis of the pole will cause us to deflect or deflect easily. Therefore, it must be calculated for the case as well.
The crane rail must also have vertical deflection control. This deflection is normally calculated without taking the vertical impact force into consideration together. Deflection limits for different types of cranes are listed below.
Top running cranes
- CMAA Class A, B and C, use the interval length divided by 600.
- CMAA class D, uses the interval length divided by 800.
- CMAA class E and F, divide the interval by 1000.
Underhung and Monorail Cranes
- CMA floors A, B and C, divide the span length by 450.
Note: Overhead cranes under heavy duty cycles must be designed with special care and should not be used.
Mechanical equipment for buildings with mezzanine floors generally consists of water piping systems, air pipes, sprayers, compressors, water pumps, fans, condensers or condensers, water tanks, transformers, switchgear cabinets, etc. These devices are installed throughout the building. collected in the machine room and/or located on the roof, which is designed with the structure These devices will be the actual payload at Considered differently from uniform leads, because in some cases some devices The referee transfers his face as a point to the building. Therefore, the designer should more deflection control must be taken into account so as not to affect the actual sleeping performance operation of such equipment
If the weight of the shift equipment is very heavy compared to the total load acting on the structure, then The tilting and racking of the equipment must be taken into account, which can reduce the performance of the equipment. In addition, if the laying is uneven, it will cause the connection point of the pipe system or the water pipe to be deformed or broken. As a standard, it is allowed to allow the roof value of the roof to be no more than Span length divided by 150 to 240 and Span length divided by 360 for considering live load for caulking, roofing.