膨胀螺栓规格尺寸表及国家标准（Specification and table of expansion bolt and national standard）

膨胀螺栓规格尺寸 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 及国家标准（Specification and table of expansion bolt and national standard） 膨胀螺栓规格尺寸表及国家标准(Specification and table of expansion bolt and national standard) 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 anchor bolt, SB high tension expansion screws 2, NC type.H type.DR type hammer type 3, SH type tube type SHF 4, 5, five, nylon sleeve cork safety rate by using the general safety in two directions: (a) the ultimate strength method: this method is expanded into concrete in the failure to pull out, as the reference point, and then to 4-5 times the rate of available security strength. This method has been used abroad for several decades. (two) proportional intensity method: this method for testing method (a), but the key to solve the deformation point (which is proportional to the load), then consider the safety benchmark rate was 2 times higher than available strength, because it can be used for Luther line (Luder 's Line' view of knowledge ") stress strain conditions, therefore more accurate and convenient, but because of the desire of a change point (proportional load), compared with the ultimate strength method of complex difficult, and must use the precise instrument, it is generally used for research, but also comply with the provisions of ASTME488-88. The limit of safety strength safety law rate, to present the 4 times (most of the main provisions, according to the rules of the weight lifting construction technology strength four times) but because of considering the earthquake and other factors, the more important for engineering or construction, to Gu its safety, life and other factors, should be considered more than 5 times. Moving load due to the dynamic conditions of the object in the afterburner produce the material rod internal resistance (resiting force of bar) is gradually returning force two times, so the dynamic load considering safety rate is more than 8 times, if considering burst force or vibration force, when according to the general safety consideration use 4-5 times, the great stress ratio is limited to within limits. In fact, the consideration of the safety ratio should be considered by designers or engineers according to the actual needs of the design. The safety ratio of the proportional strength method is relatively simple. Since the proportion load has been calculated, the 40%-60% of the proportional load is generally used as a safety factor. The average long-term load recommended by the company is 50% of the proportional strength. Six, considering the strength of cement cement in the grouting process, because the sand or water problems are often caused by the cement itself in fact phenomenon of uneven strength, it is also necessary mainly because of the field test, also is to take the test in the laboratory results can be revised to apply to the actual project position, therefore the correction coefficient is as follows: Construction - ceiling and walls correction coefficient of 0.8 - 0.9 - ground construction, correction coefficient of 0.7 - 0.8 (1) long-term static load for general long-term load modified proportional value 1/2 = ratio of long-term load bearing weight * K/2 (K: 2: safety coefficient; rate) (2) the short-term static load, the short-term load is the corrected value of the proportional load, the short-term load = the proportional load * the correction factor Designers or engineers should consider the safety of applications Seven, two spacing and margin consideration, two spacing, standard spacing, minimum margin (most apart), metal expansion screws embedded depth of more than 3.5 times, embedded depth of 3. More than 5 times more than 3.5 times the embedded depth (tension will reduce) the chemical anchor bolt 2 times 1.2 times 0.5 times (eight, will reduce the tension) other expansion screws use often because other factors (such as concrete strength, construction deviation etc.) affect the quality, so it can be on the scene to obtain instrument test data, when in right. The company is equipped with test instruments for on-site destruction or non-destructive test in two ways, to obtain stress - stress data for design and use reference. Expansion bolt related technology (such as drawing) One