FM 5-277 PDF

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Actions Shares. Embeds 0 No embeds. No notes for slide. TM 1. See also par. TM , 15 September , is changed as follows: DS All Double rocking rollers. TS All Double rocking rollers. DD All Double rocking rollers. TD All Double rocking rollers. All All Under or over- Single rocking rollers.

Single rocking rollers. Double rocking rollers. When tem- plates are not available a transom can be used to locate bear- ings figs. Figure General—The launching nose fig. It does not have stringers or decking. All bays have one transom each. Composition of launching nose. All launching assemblies shown are at point of balance at rocking rollers on near bank. Launching rollers must not be nearer than 2 feet 6 inches to final position of end posts as shown: 3.

Sag indicated is approximate sag at tip of launching nose, just before reaching far bank. These figures aid in determining number and position of launching-nose links required for launching nose to clear for bank. One pair of rocking rollers is required on both near and far banks. These figures aid in determining number and position of launching-nose links required for launching nose to clear far bank.

Two pairs of rocking rollers are required on near bank, and one pair on far bank. Sag indicated is approximate sag at tip of launching nose just before reaching far bank. However, when any part of launching nose consists of double-truss construction, two pairs of rocking rollers are required on far bank.

These figures aid in determining number and position of launching-nose links required for the launching nose to clear far bank. Two pairs of rocking rollers are required on both near and far "banks. Panels of launching nose are used to complete portions of bridge marked thus: 1 I c. Use of launching-nose links. Arrival of launching nose on far bank. Caution: The near-shore rocking rollers and the far-shore landing rollers must carry the entire load after the launching nose reaches the far-shore landing rollers fig.

The rear of the bridge must hang free to act as a counter- weight. This may be done by cribbing up near-shore rocking rollers, or removing plain rollers, so rear end of bridge will not rest on them after launching nose reaches far-shore landing rollers. If removal of plain rollers is not sufficient, excavate ground to give necessary clearance. Place two panels side by side on ground just back of rocking rollers. Clamp transom to panels behind foreward up- rights.

Secure rakers to transom and panels with bracing bolts. Raise rear of first panel onto rollers fig. Connect second bay fig. Insert panel pins with points outward and with grooves in heads of pins horizontal fig. In double- and triple-truss construction, point pins inward in second and third trusses. Insert pickets at each stop to prevent bridge from rolling. Lift front end of bay onto rocking rollers fig. Raise rear end and slide plain rollers under it. This places plain rollers approxi- mately 9 feet from rocking rollers.

Add second bay. Place pair of sway braces in second bay fig. If required, place launching-nose links in position between panels fig. Use of links requires a pair of plain rollers placed 12 K feet behind near-shore rocking rollers and 2 inches below the line of sight joining the other rollers fig. They prevent the launching-nose links from fouling the ground.

These additional rollers are removed as soon as the links have passed over rocking rollers. Continue adding panels fig. When construction of the nose is completed, continue construction by adding panels in every bay figs. In single-story construction the transoms in the main part of the bridge should be behind the panel uprights so stringers and decking can be placed on each bay as it is built. Add transoms every 5 feet on.

All transoms in the bridge proper must be in front, or all in rear, of uprights of the panels or the decking will not fit. In double-story construction the first transom should be behind the end uprights and the others in front of the uprights. Install rakers joining panels and those transoms which are at panel joints. In double- and triple-truss construction Figure Then all these bracing parts should be tightened.

Do not let bridge get out of balance on rollers; push it forward as panels are added to the rear fig. Always make certain center of balance remains behind rocking rollers.

Place one pair of plain rollers 25 feet behind rocking rollers when launching bridges up to 80 feet long. Bridges over 80 feet long require addi- tional sets of plain rollers spaced at foot intervals. To insert additional rollers, push bridge forward until rear of bridge can be lifted.

Insert steel pickets through lower chord and rocking rollers to prevent bridge from rolling on the rocking rollers. Lift rear of bridge and place additional rollers seoting them so the tops of all rollers are in the same plane.

In double-story construction the first bay of the bridge proper is left undecked until the bridge reaches its final position and the nose has been removed. This allows the decking detail to keep closer to the panel detail and gives the men erecting the second story more room in which to work. For the remainder of the bridge, add stringers bay by bay during assembly. As bays of the bridge are completed, it is rolled across the gap; however, until the launching nose reaches the far bank the center of gravity must be kept behind the rocking rollers.

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Distribution Restriction: Approved for public release. Distribution is unlimited. FM 9 May FM The Bailey bridge used in World War II was The purpose of this manual is to provide the designed to be moved, rebuilt, or replaced in user instructions needed to build the standard several hours, even under enemy fire.

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