Anchor bolt brittle breakage? ------------------------------------------------------ Post-buried parts are built on concrete, and steel bars are often encountered, especially large-size anchor bolts. On-site construction personnel often choose to drill the oblique hole to avoid the steel bar, after installing the anchor bolt, and then break the anchor bolt; in the case where the bending angle is not particularly large, the 4.8 level, 5.8 level anchor bolt will not appear obvious cracking or fracture phenomenon, but the anchor bolt above 8.8 level is more sensitive to bending, and the angle is larger may lead to the cracking or direct breakage of the anchor rod, or some directly use the hammer to knock the fracture. Therefore, it is particularly important to promote the correct installation method, usually the installation of anchors is perpendicular to concrete, avoiding the location of reinforcement.

" In the application process of anchor bolts, there will often be fractures, brittle breaks and other phenomena, which seriously affect the construction quality and efficiency, how should we reduce the occurrence of such problems?"

Anchor bolt is a widely used and relatively important structural part, commonly used in the anchoring of concrete. Some anchor bolts above 8.8 level will occur brittle in the process of use (including chemical anchor bolts, mechanical anchor bolts), in contrast, 5.8 level anchor bolts have a certain strength, plasticity is better; but many projects require the use of anchor bolts with higher strength (8.8 or more), generally speaking, the anchor bolt strength is high, there will be better tensile and shear bearing capacity, while the hardness is higher, the plasticity is reduced, the construction process is easier to break, increasing the difficulty of construction.

01

Material problems

For example, the carbon and phosphorus content of steel exceeds the standard, which may lead to a decrease in plasticity, the problem of brittleness in construction, and the sulfur content exceeding the standard, which may lead to an increase in thermal brittleness and a decrease in corrosion resistance; raw materials are the most fundamental problem affecting the comprehensive quality of anchor bolts, and these anchor bolts may have more problems and potential risks in practical applications. However, the problem of raw materials is usually not directly identifiable, and in addition, the process stability of different raw material manufacturers often determines the stability of anchor products. Therefore, the supply of high-quality raw materials is very important.

02

Process issues

1) Heat treatment process; some alloy steels can achieve higher strength through heat treatment, improper heat treatment may lead to reduced material toughness and impact resistance, there are differences in the physical and chemical properties of different materials, and the sensitivity to the heat treatment process is not the same; obtaining good and stable materials is a problem that material manufacturers have repeatedly pondered. Simply put, good and stable materials are the premise of ensuring product quality, and the controllability and stability of the entire production process can reduce the number and quantity of problems; the self-inspection of products and the experiment of project matching can effectively improve the quality of shipments.

2) Galvanizing process; when the material strength is high, the sensitivity to "hydrogen embrittlement" will rise, in the plating process, pickling, electroplating, degreasing and other links, may seep hydrogen, the number of more will produce "hydrogen embrittlement" effect, so the "dehydrogenation" process is very important. In addition, improper heat treatment will also cause the surface layer of the anchor bolt to be stiff, and the plasticity is reduced and brittle.

03

Construction issues

In general, there are many factors that cause brittleness of high-strength anchors, raw materials, processing technology and improper use methods may lead to problems, and correct use methods are also required while controlling product quality. Therefore, the after-sales service of related products is very important, and timely technical communication and construction guidance can effectively reduce the occurrence of such problems.