Railway bridge deck has 3 main types: surface trough bridges with stone chips (three slices), the sphere has sleepers placed
directly onto its surface which ray beams and placed directly onto the deck (no sleepers and stone
ballast ).
4.1.2.1. Sphere with ballast tray:
Pros, cons:
- Type of rubble chute demand uniformity creates stiffness between the road and the bridge should
ensure the ship running smoothly, minimizing shock force.
- In to put the case on a curve in the sphere of this type allows to create
ultra-high by changing the thickness of the layer of crushed stone.
- the main disadvantage of this type of sphere is the sphere increases the static load and increase height
the architecture of the bridge should now rarely used (especially in the steel truss bridge).
4.1.2.2. Ceiling sphere (sleepers placed directly on the beam)
. Pros, cons:
- The deck of this kind of simple structure, reduces dead load and height sphere architecture
of the bridge should be applied fairly disseminated.
- The main disadvantage is difficult to ensure the uniformity of hardness middle of the road on the bridge and
bridge to external shock forces often cause loud noise and when the vessel.
- Difficult to create ultra-high when demand is placed on the curve by
4.1.2.3. Ray sphere have placed directly onto the deck
b. Pros, cons:
- Do not have gutters rubble and sleepers so this sphere style architecture and reducing the height
of the structural rhythm static load, saving the cost of materials and maintenance and repair of stone chips trough sleepers.
- the shape of simple concrete girders, workability since quit rubble trough edges.
- the disadvantage is associated ray structure as complex as the faster train speeds.
- the ship smoothly out on the bridge when less than the demand side with rubble chute.
- for rail and automobile bridges with the general travel style is quite appropriate sphere.
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