Steps for Erection and Launching of 360 feet span Bailey Suspension Bridge

Steps for Erection and Launching of 360 feet span Bailey Suspension Bridge.

Right Bank Flow Direction Abutment Anchorage Block Anchorage Blocks Left Bank Abutment.

Erection of Towers on each Bank. a) Fixation of Tower base and sliding plate to the Abutment.

Erection of Towers on each Bank. b) Fixing Tower base perpendicular to the abutment on both upstream & downstream.

Fixing of support and the pulleys to pull the panels up manually.

Fixation of saddles on top of towers to place the cables.

Cable Marking and Laying of Cables. The positions of the suspenders has to marked with some paints/tie rope on the main cables so as to fix or suspend the suspenders during launching..

FIXING SUSPENDERS & LAUNCHING OF BRIDGE. Fixing of Suspenders.

FIXING SUSPENDERS & LAUNCHING OF BRIDGE. The each panel is connected horizontally with help of panel pin, and the top chord of panel is connected to main cables through the suspenders on both upstream and downstream panels..

FIXING SUSPENDERS & LAUNCHING OF BRIDGE. The each panel is lifted manually and connected on the front face of bridge with help of chain pulleys and the suspenders. In normal bailey bridges, it is launched from one bank after connecting the panels and pushing the connected panels through the span, but in bailey suspension it is launched from the banks and meets/connect at center of the span..

FIXING SUSPENDERS & LAUNCHING OF BRIDGE. From the other/opposite bank launching has to be carried out in the same way of that earlier launching on one bank. The connection of panels in the front has to be carried out from both the banks until it meets at the mid span. The panels have to be connected to cables through suspenders at every 20 feet..

FIXING SUSPENDERS & LAUNCHING OF BRIDGE. After the panel connections completed the main cables are adjusted (Tensioned by adjusting the screw adjusters), so that the bridge should not be undergoing sagging due to self weight. The main cables are connected/anchored to anchorage blocks at each bank with help of Trewhella Grab, Screw adjusters and Rag Bolt Rock Connector Anchor.

Placing and fixing of plain and button stringers.

Bridge Load Testing. Bridge load test must be carried out after completion of launching. Load test is carried out by gradually increasing the load up to the design carrying capacity of the bridge..

Dirt wall construction and fixing of end decks. 1.

Final Shape of the Bailey Suspension Bridge.