The head forming of high-strength bolts can be achieved through cold working or hot working and rolling method for thread formation, followed by quenching in a salt bath furnace or roller hearth furnace. The quenching temperature should be selected between 860°C and 880°C, and the nitriding furnace tempering should be between 340°C and 380°C.C) Treatment to enhance its strength and hardness. To improve the anti-corrosion capability of high-tensile bolt connections and to improve the lubrication condition between bolts and nuts, proper lubrication treatment should be applied to the surface. The nuts of high-tensile bolts are preferably made of Grade 35 steel and should undergo appropriate heat treatment, with the physical properties of Grade 35 steel complying with the relevant provisions of "Technical Conditions for Carbon Structural Steel" (GB 699). The nuts should be formed by hot forging and processed after heat treatment, with lubrication treatment applied to the nuts.
Adding energy-absorbing blocks between the guardrail and the posts offers several benefits: 1. The blocks themselves act as energy-absorbing mechanisms, allowing the guardrail to gradually deform upon impact, which aids in energy absorption and reduces the risk of occupant injuries; 2. Fixed between the posts and the guardrail, the blocks suspend the guardrail from the posts, preventing the front wheel from being trapped against the post when an out-of-control vehicle collides with the guardrail; 3. Once the blocks are integrated into the guardrail's overall function, they distribute collision forces across more spans, resulting in more even load distribution on the guardrail and smoother collision paths, which is beneficial for vehicle guidance and enhancing the overall strength of the guardrail; 4. On sections with road curbs, the blocks can reduce the distance between the guardrail and the curb face, mitigating or eliminating the adverse effects caused by an out-of-control vehicle bouncing off the curb and impacting the guardrail.
W-beam guardrails are a type of excellent guardrail, commonly used and frequently constructed on various road traffic projects. Ensuring the prevention and continuous efficiency of W-beam guardrails requires high standards in construction. Accurate numerical data is essential during the manufacturing process, demanding precise technical specifications. However, for various reasons, attention is also paid to errors during the production of W-beam guardrails.
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