- Damage expansion joint and non-shrinkage concrete by structural behavior discordance

- Decreasing durability by bearings' corrosion such as furred walls and copping and deterioration

- Difficult drivability securement by damage of expansion joint and concrete

- Increasing the cost of construction by frequent maintenance and repair.

- Securing perfect and equal waterproof quality by unification

- Preventing damage of non-shrinkage concrete and improving a stability of drive

- Decreasing the cost of maintenance by various repair works reduced.