Method for judging occurrence time of transverse crack at bottom of prestressed box girder
A technology of transverse cracks and occurrence time, which is applied to bridges, bridge parts, bridge construction, etc., can solve the problems of increasing the workload of inspection and aggravating beam damage, etc., and achieves the effect of convenient implementation and strong practicability
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[0019] combine figure 1 , figure 2 and image 3 , a method for judging the occurrence time of transverse cracks at the bottom of prestressed box girder girders, according to the following steps:
[0020] First, observe the general direction and location of the transverse cracks (referred to as cracks) 2 on the beam bottom 3, whether there is a gap 4 or a gap 5 at the edge of the cracks; and look for dust traces 6 across the cracks 2 along the length of the cracks 2.
[0021] Next, take a core sample 7 with a diameter not greater than 30mm along the depth direction of the crack 2, and break apart the core sample 7 to observe the interface between the concrete aggregate and the slurry on both sides of the crack 2.
[0022] Thirdly, observe the variation of the crack width on the surface of the transverse crack at the bottom of the box girder when the heavy-duty vehicle passes the bridge.
[0023] Finally, a comprehensive judgment is made on the cause and occurrence time of t...
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