JGJ128-2000 door type steel scaffolding specifications only adjustable adjustable screw extension of the base of the relevant provisions of the top of the screw extension of the length of no provisions, but in the specification check the inspection items to check the extension of the screw extension length. What is the standard?
From the calculation point of view, the end of the care and the top of the extension of the length should be the same, "construction calculation quick manual" seems to have this one of the provisions, as well as the safety of our province continue to re-education on the door scaffolding Textbooks are specified, the top care can be stretched 30CM, but the calculation to be converted, the film coefficient is 0.9, 35c out of the conversion factor is 0.8, out of 40cm, conversion factor is 0.7. Time is longer, the above data is for reference only.
According to the information provided by the door steel pipe scaffolding manufacturers, usually a mast to allow the load of 49KN, that is, adjustable base adjustment screw extension length of not more than 200mm, each pole is 24.5KN, out of the length of 300mm, each root Rod is 24.5 × 0.90 = 22.05KN, extension length of more than 300mm, each pole is 24.5 × 0.80 = 19.6KN. Adjustable base, the maximum adjustable height of the top care: 400 when the high 250mm, 780 high when the 520mm. (The most critical is to see the manufacturers to provide the data)
JGJ128-2000 (JGJ128-2000) Section 9.1.4 of the door type steel pipe scaffolding used as a template support and full of scaffolding, adjustable base adjustment screw extension length should not exceed 200mm. When more than 200mm, the design value of a mast bearing capacity, that is, this specification (5.2.1-5) type Nd should be adjusted according to the adjustable seat extension screw length correction: extension length of 300mm, should be multiplied by the amendment Coefficient 0.90, more than 300mm, should be multiplied by the correction factor 0.80. The height of the template support frame should be adjusted with adjustable jacking.
Door scaffolding jacking screw extension length should not exceed 200mm.
