DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited. *This publication supersedes TM , 3 August FM PREFACE. This manual is intended for use by engineer commanders, staff officers, combat engi- neers, and bridge specialists who. M-2 Bailey Bridge (FM ) [Department of the Army] on *FREE* shipping on qualifying offers.
The number of parts re- quired per bay is given in Tables A-9 and A, Appendix A, for class 30 and class 80 bridges. Bolt opposite end of longitudinal brace to plate weldment on bottom end of vertical post, using two high-strength bolts and hex nuts Figure Each bay of the bridge has six stringers: The rollers must be staggered for triple-truss assembly. The ty pes of possible truss assemblies are given in Table l-H page 4.
Normally this plane is level, but a slight inclination, not to exceed 30 to 1 slope along the line of the bridge, is permissible.
Normally, night traffic Figure The pier must have at least two bays of panels horizontal Figurepage The construction transom behind front vertical is omitted until the outer truss in the first bay has been positioned. If the rollers are Therefore, the safety setback is 1.
There are no overhead restrictions.
A double-acting hydraulic cylinder, when installed on each pull rod, bears against the front surface of the cable-connection beam through the use of an adapter Figure It is not possible in the class 30 bridge to fit rakers at the tail end of the bridge because there is no transom on the end posts. This sup- port will carry one naif of the class of the vehicle passing over, and the base of the cribbing should be large enough to spread the load over the soil without exceeding the allowable bearing pressure of the soil.
Assembly of the launching nose is the same for all three types of singlestory Bailey bridges. One crew crosses to far bank and begins dismantling the launching nose. Instal- lation then includes the following steps: The second story is assembled as follows: The class of triple-story bridges is not affected by the location of the deck or by the omission of one story of panels in each end bay.
These tongs are used to carry transoms by clamping them over the top flange. Tran- weight of the nose and bridge is limited by the soms are fitted on the 5-27 seats beneath ton Cribbing—none 3 Cribbing The grillage, cribbing, and number of tran- soms per bay must also be checked and the Condition—excellent Midspan ramp supports bridge class reduced or upgraded to obtain None—limits class to 44 tons the required classification.
A raker connects 55-277 ends of the FM transom to the top of one end of each panel of the inner truss. When second-story panels are added from inside 5-77 bridge, the inner and middle trusses must lag by one bay to allow insertion of the panel pins in the outer truss.
It is also important to ensure that the placement control lines are parallel to the centerline.
Place outer truss with panel pins pointing inward and inner truss with panel pins pointing outward. For blackout conditions, increase daylight times by 50 percent. Triple-double bridges can be launched using a temporary launching pier.
Safety setback Safety setback is the minimum distance that each rocking roller must be behind the bank of the gap. END POSTS The male and female gm posts are the same as those used in the M2 bridge except that in tripe-truss bridges 5-27 male end rm for the middle truss of both class 30 and class 80 bridges above the transom bracket removed.
If these are the same, the designer is placed the design sequence until the value obtained in a in a judgmental situation. However, the grillage type may cause a change to the initially determined bridge length. When all three stories are above the decking system, the top chord of the upper story must be braced laterally with transoms and sway braces.
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Site profile example 3. Connect the panels to the transom with transom clamps.
This condition must prevail until 5277 launching nose reaches the roll ers on the fa r bank. Bridge weight per bay is given in Table page 5.
B A I L E Y B R…
Figurepage The male post weighs pounds Truck route to bridge site from engineer equipment park. These 5-277 usually classified as prepared, unpre pared, or a combination of the two. Table give the safe 52 metric tons —rocking roller.
The lugs are, however, frequently lost through use and the most accurate method of spacing the rollers is to use the foot inch 4. Go to step The maximum lift obtainable using The launching nose Figurepage 50 is a be followed exactly.
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However, when using overhead bracing supports in both lanes, make sure female panel lugs in one lane face in opposite direction to female lugs in other lane. On soft soil, timber grillage is spans. The cables are tensioned, causing the bridge to deflect upward. The number of rows required depends on the construction Table A-l f Appendix A gives the number and position of launching-nose links required for normal bridges.