What method is used for alignment during the erection of steel on concrete pads?

During the erection of steel on concrete pads, the plumb bob and transit method is commonly employed for alignment due to its effectiveness in ensuring vertical accuracy and level alignment. The plumb bob is a simple yet precise tool that utilizes gravity to indicate a true vertical line. When used in conjunction with a transit, which is an optical instrument for measuring both horizontal and vertical angles, it allows workers to not only align the steel structures vertically but also to check horizontal placement during the erection process.

This combination is particularly useful because it does not depend on technology and can be effectively used in varying site conditions, making it a reliable choice for lineman apprentices. Additionally, this method is traditional and widely understood in the construction industry, providing a solid foundational technique that is essential for accurate erecting of steel frameworks.