顶板底板控制
controlling of roof and bottom
鞍座底板断裂
fracture of saddle support mat
白底板病
white abdominall shell disease
white abdominal shell disease
板底滑道
Pole-slide with plank-bottom
板底脱空
hollow board
Void beneath Cement Concrete
Cavity beneath road slabs
Bursted bottom plate
slab suspending
void under slab
empty space beneath the slab
gapping under pavement slab
plat-bottom escape
void at the bottom of slab
Hole under Concrete Pavement
void beneath slab
cavity beneath slab
cavity of slab
void beneath concrete slab
void underneath pavement slab
slab hollow
板底脱空注浆
grouting treatment for void beneath slab
板底弯沉
deflection beneath old concrete slab
板底压浆
cement grout injected under slab