Underbridge Catalog

FIGURE 12 - design loads on supports

direction of duct run

supports

weight of duct

vertical direction

transverse load or normal direction of wind

direction of expansion frictional force

longitudinal direction

direction of load on stranding

6:04.3 When ordering, supply the "X" and "Y" distances and angle of the fittings as shown in Figure 14.

FIGURE 15 - guy clamps for longitudinal bracing

FIGURE 14 - dimensions for determining length of braces

UB5905

single bolt clamp assembly for intermediate

horizonal distance ‘X’

triple bolt clamp assembly for strand termination

UB5904

vertical distance ‘Y’

length of brace struct ‘C’

for installation of these clamps see figure 16

6:05.2 The size and strength of the strand used will depend on the number of conduits plus the distance between angle-braced supports. A 3/16” strand (with an ultimate tensile strength of 2200 lbs) or a 3/8” strand (with an ultimate tensile strength of 8700 lbs) can be used depend- ing on the anticipated forces encountered. Guy clamps accommodate both of these strand sizes.

various styles of adjustable braces are available.

6:05 Longitudinal Bracing The purpose of longitudinal strand bracing is to enable intermediate supports to carry the loads developed primarily by expansion and contraction on the conduit. 6:05.1 Hangers are equipped with a 2” x 2” square tube with bolt holes for the attachment of the strands. The fittings shown in Figure 15 accom- modate the different strand sizes normally used on intermediate hangers. Note that a special “triple” clamp fitting is used for dead-ending strand.

6:05.3 Longitudinal bracing should be terminated: (1) At both sides of bridge expansion joints. (2) At every stop ring location. (3) At a maximum strand length of 200’.

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