Section 2: Temporary Railing
Section 2: Temporary Railing
Precast Concrete Safety-shaped Traffic Barriers
Precast Concrete Safety-shaped Traffic Barriers
For temporary railing, use the single-slope concrete barriers (SSCB), the F-shaped concrete barriers (CSB), or the low profile concrete barrier (LPCB) detailed in the
.
Consider available railing slide space when deciding whether to anchor the barrier. Crash-test vehicle performance is better with the unanchored barrier. TxDOT does not allow using unanchored precast safetyshaped traffic barriers unless at least two feet of slide space is available behind them to allow the energy of an impact to be absorbed by the change in momentum of the barrier mass. See the
for details to anchor SSCB, and drawing
for details to anchor CSB. LPCB is not allowed to be anchored; therefore, slide space must be accommodated.
Most precast barriers are in 30-foot segments and LPCB barrier is in 20-foot segments. TxDOT discourages use of shorter segments for temporary bridge railing. For 10-foot segments to perform adequately as a temporary railing, they require significant connections that add complexities in the form of dowels, cables, bolted lap splices, etc. If barrier segments are 30 feet long, they can be connected easily with only nominal equipment.
After removal of temporary barrier, any holes made in the bridge deck for anchoring must be repaired in accordance with Item 429, "Concrete Structure Repair," and the
.
Steel Traffic Barriers
Steel Traffic Barriers
Steel barriers provided on the
may be used for temporary railing on bridges. Installation of these barriers is per standard drawing and Manufacturer’s recommendations. Allowable deflection, based on anchoring method, as shown on the standard drawing must be taken into account when selecting and locating a barrier for temporary placement.
After removal of temporary barrier, any holes made in the bridge deck for anchoring must be repaired in accordance with Item 429, “Concrete Structure Repair;” and the