Tubular stretcher bars type GV and GRV are intended to stabilize the doorpost of roadways and chamber made of profiles V25, V29, V32, V34 and V36.
Tubular stretcher bars type GV and GRV struts are unsymmetrical.
Tubular stretcher bars type GV are produced in two versions (depending upon the hook bolts):
– Version using two hook bolts with resistance diameter ø18 mm;
– Version of the application of the screws hook resistance with a diameter of ø18 mm and screw the hook taper ø 24 mm.
Tubular stretcher bars type GV are manufactured to the door frame spacing exceeding 1.25 m.
Tubular stretcher bars type GRV is adjustable struts used if necessary to maintain a variable spacing doorpost on the right or left ociosie, mainly in the performance:
– Excavations in curves,
– Branches and forks.
Adjustable tubular stretcher bars type GRV produced versions using screw hook resistance with a diameter of ø18 mm and screw the hook taper ø 24 mm.
Adjustable tubular stretcher bars type GRV are provided for spacing the lintel: 400-450 mm, 450-550 mm, 500-650 mm, 550-750 mm, 600-850 mm, 650-900 mm, 700-950 mm, 750-1000mm. 800-1000 mm, 850-1000 mm and 900-1000 mm and 950-1000 mm.
Tubular stretcher bars type GV and GRV have appropriate certificates permitting their use in underground mines in the fields of methane and non-methane in excavations classified as “a”, “b” or “c” methane explosion hazard and Class A or B explosive coal dust.