In order to achieve the requested pavement markings, Chrisp used some unique equipment for the Bay Bridge striping. "Chrisp Company came up with a proprietary pre-marking design that evolved from a dune buggy frame. We decided to build what had been on a dune buggy onto a truck so that the operators were safer, had communication, and they could travel more easily," Anderson says.
These trucks feature an air compressor, paint tanks, and a computerized skip timer. The skip timer allows the operator to select a specific pattern for layout. "Raised pavement markers were specified for a special skip-dash pattern which required thermoplastic application for motorist recognition and durability on pavement surfaces," Anderson says. The specially-designed layout trucks allowed the operator to set that specific pattern before starting.
The layout trucks also feature a series of multiple booms and paint guns so the operators can select a pattern in the skip timer and layout multiple lines in one pass, Anderson adds. For this project, the operator lowered a boom to the left and one to the right and was able to layout three lines at once. A long line truck and a raised pavement marker truck followed, applying the thermoplastic striping and reflective and nonreflective markers according to the skip-dash layout. An airless walk-behind striper was used to install contrast striping for lane lines.
In all, Chrisp installed approximately 5,000 raised reflective and non-reflective pavement markers, roughly 12,000 lbs. of thermoplastic material, and 2,000 lbs. of glass beads, Anderson says.
Striping was the final stage of the closure, so once all marking were installed Chrisp conducted one final drive through and then the bridge was reopened - only 90 minutes past the projected opening time.