The railway sphere has 3 main types: the sphere have trough the rubble (three slices), the sphere has sleepers set directly to the beams and the sphere has ray put directly onto a spherical surface (no sleepers and rocks balát). 4.1.2.1. The sphere has the stone trough balát: Pros, cons: -Types of spherical surface containing stone chips creating the trough of copper for about độcứng between the road and the bridge should ensure the ship running smoothly, minimize the shock force. -In case the demand placed on the curve by the type of this sphere allows to create Super high by changing the thickness of the layer of rubble. -Weak đỉểm of this sphere type is increases the static load of the sphere and increase height the architecture of the bridge should present little use (especially in secondary steel bridge).4.1.2.2. the earthly sphere (sleepers placed directly on beams):. Pros, cons: -Sphere type has a simple structure, reduce static load surface height and architecture of the bridge should be applied quite phổbiến. -The main downside is hard to guarantee the uniformity of stiffness between the road on the bridge and In addition requested often causes vanguard force and big noise when the ship. -Difficult to create super high when demand placed on the curve by4.1.2.3. Sphere has ray put directly onto a spherical surfaceb. Pros, cons: -Do not have trough the rubble and sleepers should model this sphere of architecture and height reduction static loads of texture rhythm, saving maintenance costs and materials for repair trough the crushed stone sleepers. -Shape girder concrete bridge construction for simple, easy flange removed rubble chutes. -The downside is made more complicated when the rail link running speed the faster ship. -Quiet Mode upon a boat on the bridge with the sphere have trough the rubble. -For automotive and railway have gone public this sphere type are quite appropriate.
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