What is the function of cross-ties in multiple row patterns using detonating cord?

• A. To shorten the overall length of the detonating cord
• B. To connect the ends of branchlines and provide detonation paths
• C. To manage the explosive charge volume
• D. To increase safety during the detonation process

Answer: (B)

The correct answer identifies the primary role of cross-ties in multiple row patterns utilizing detonating cord. Cross-ties are essential for connecting the ends of branchlines in a blasting pattern, allowing a continuous and reliable detonation path. This connection ensures that when one part of the detonating cord is ignited, the shock wave can travel effectively along the entire length of the detonating cord and through the branchlines. This capability is crucial for achieving synchronous detonation, which is necessary for maximizing the efficiency and effectiveness of the blast in managing rock fragmentation.

This function is distinct from the roles of the other options. For example, while one might think that shortening the overall length of the detonating cord would be a benefit of cross-ties, that’s not their primary purpose; cross-ties actually facilitate rather than shorten the use of cord across the pattern. Similarly, managing explosive charge volume is more related to the amount of explosive used and its placement rather than the mechanical layout provided by cross-ties. Safety during the detonation process is certainly a consideration in blasting operations overall, but the specific function of cross-ties is more focused on the connectivity and effectiveness of the detonation sequence rather than directly influencing safety measures.