Specification and introduction of tube bolt testing in Subway

Testing specification for tube bolts for subway
1, municipal "fasteners mechanical properties bolts, screws, and stud" GB/3098.1-2000.
2, the subway, which is referred to as the "underground railroad", city rail transit system in narrow sense refers to operation of the underground. But in a broad sense, because many of these systems may also have ground based sections in order to match the built environment, they usually cover all kinds of underground high-density transportation systems in the metropolitan area.
From a professional point of view, the difference between light rail and subway, is not in heaven and earth, but in the heavy rail and the maximum cross section passenger flow: Rail weight per meter 60 kg per hour, 15 thousand passengers to 30 thousand passengers called light rail; rail weight per meter 60 kilograms, call the subway traffic per hour to 30 thousand 60 thousand passengers.
A tube bolt for repairing the bolt on the subway
Pipe bolt; widely used in subway construction, mine construction fasteners.
The pipe bolt is divided into circumferential and longitudinal.
In some designs, the circumferential and longitudinal specifications are the same.
In some designs, two kinds of specifications, even two kinds of strength grades, are adopted in the loop and the longitudinal direction.