收缩螺栓规格尺寸表及国家标准(国外英文资料).docVIP

膨胀螺栓规格尺寸表及国家标准(国外英文资料) This article is contributed by Guo Lisuan Pdf documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Standard Specification for expansion bolts, national standard JB/ZQ4763-2006 expansion bolts The implementation of standards, the expansion bolts fixed screw expansion screws fixed principle is to use the oral form to promote the expansion of slope friction grip, achieve the anchoring effect. Two, the expansion screw depth of buried depth of buried general expansion screws with fixed by bolt diameter 4 times was calculated on the basis of deep buried, more tension, it can withstand the shear force is greater, but because manufacturers design problems need to be considered factors containing material and anchoring etc.. Three, the use of reference for the expansion screw (a) of concrete strength (two) strength of fixed screw (calculated by material) (three) strength expansion screws (manufacturers design), four expansion strength test of screw strength expansion, the past with a hydraulic device under pressure, the maximum strength out of the expansion screw the tensile strength, the test failed to detect defects is left screw displacement of cement, that is to say, we cannot know the expansion itself material elastic stress is in Newton, so the new measuring instrument, the pulling force and displacement to coordinate picture, Y axis tension. The X axis is a displacement (Figure) when the tension rises, a Increase until the cement breaks or expands, the screws pull out or snap. The highest point of the curve, namely ultimate tensile force, when tension increases to a certain point, such as the removal of tension, displacement can still return to the place, this is the expansion screw itself material yield point, it is also for us to design the proportion of load. The commonly used expansion curves of screw, can be divided into 5 minutes. 1, chemical an