Section 2: Recommended Temporary RailingAnchor: #i998977
Precast Safety-shaped Traffic Barriers
For temporary railing, TxDOT recommends the single-slope concrete barriers (SSCB), the F-shaped concrete barriers (CSB), or the low profile concrete barrier (LPCB) detailed in the Roadway Standard Drawings.
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 safety-shaped 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 Roadway Standard drawing SSCB (5)-10 for details to anchor SSCB, and drawing CSB(7)-10 for details to anchor CSB. LPCB is not anchored; therefore, slide space must be accommodated.
Also consider length of the construction area when selecting railing. If barrier segments are 30 feet long, they can be connected easily with only nominal equipment. However, to perform adequately as a temporary railing, 10-ft. segments require significant connection in the form of dowels, cables, bolted lap splices, etc. Most precast barriers are in 30-ft. segments and LPCB barrier is in 20-ft. segments. TxDOT generally discourages use of shorter segments for temporary bridge railing.Anchor: #SPOCBSPI
Steel Traffic Barriers
Steel barriers provided on the Roadway Standards webpage 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.”