Wedge anchor characteristics:
wedge anchor lengths have longer threads and are easier to install, and are usually used in heavy-duty facilities. To obtain a reliable and huge fastening force, it is necessary to ensure that the clamp ring fixed on the anchor bolt is fully expanded. The wedge anchor keeps spinning and the expansion clip should not fall off the pole or twist in the hole. The calibrated tensile values are all tested under the condition of cement strength of 260~300kgs/cm2, and the maximum safe load shall not exceed 25% of the calibrated value.
The edges and spacing of the wedge anchor and the thickness and width of the substrate must be strictly implemented in accordance with the requirements to ensure the required bearing capacity of the wedge anchor. Otherwise, the building materials may break off or cracks.
The drilling depth of the wedge anchor Through bolt must be greater than the depth of the expansion rear end: In this way, the wedge anchor Through bolt has enough space to expand, so that the anchoring function is guaranteed. It is indispensable to clean the holes by blowing, brushing, etc. after drilling. Uncleaned holes will reduce the bearing capacity. The debris generated by drilling will affect the normal anchoring ability of the wedge anchor Through bolt in the cavity.
The four inspection methods of the manufacturer before leaving the factory are summarized:
1) Appearance quality requirements: The inspection of the appearance of the wedge anchor through bolt is from the appearance, wedge anchor galvanized and other aspects.
2) Inspection of coating thickness of wedge anchor Through bolt
1. Measuring tool method: The amount used includes micrometer, vernier caliper, plug gauge, etc.
2. Magnetic method: The magnetic method measures the thickness of the coating layer, which is a non-destructive measurement of the non-magnetic coating layer on the magnetic substrate with a magnetic thickness gauge.
3. Microscopy: The microscopy method is called the metallographic method, which is to magnify the etched fasteners on a metallographic microscope with a micrometer eyepiece to measure the thickness of the coating on the section.
4. Time flow method
The chronograph flow method is to use a solution that can dissolve the coating on the partial surface of the coating, and calculate the thickness of the coating according to the time required for the partial coating to dissolve. There are also plating spot method, anode dissolution coulometric method and so on.
3) Inspection of coating adhesion strength of wedge anchor Through bolt
There are many methods to evaluate the adhesion of the coating to the base metal, usually the following: friction polishing test; file method test; scratch method; bending test; thermal shock test; extrusion method.
4) Wedge anchor Through bolt coating corrosion test
The coating corrosion test methods include: atmospheric exposure test; neutral salt spray test (NSS test); acetic acid salt spray test (ASS test), copper accelerated acetic acid salt spray test (CASS test); and corrosion paste corrosion test (CORR test) and solution spot corrosion test; immersion test, inter-immersion corrosion test, etc.
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Post time: Sep-17-2020