Cambodia Type 200 Double Carriageway Double Deck Bailey Steel Bridge

Class of Bailey Steel Bridge Supports

1. Simple support made of linoleum, asbestos clay or cement mortar cushion
For a span simply supported plate or beam bridge under 10m, the plate or beam shall be directly placed on the said cushion without special support. Deformation performance is poor, fixed support in addition to cushion, but also the use of anchor bolt to connect the upper and lower parts of the structure.
2. Cast Steel Support
(1) Arc-shaped steel plate support: also known as tangential support or line support. The upper support is flat plate, and the lower support is arc-shaped steel plate. The steel plate adopts about 40~50mm cast steel plate or hot-tie steel plate, the disadvantage is that when moving to overcome the larger friction resistance, with a large amount of steel, processing trouble, generally used in small and medium-sized Bridges.
(2) Cast steel support: the support is made of carbon steel or high quality steel and made by molding, sand turning, casting, mechanical processing and heat treatment. Large size, large steel consumption, easy to rust and high maintenance costs.
3. New Section Steel Support
(1) Stainless steel or alloy steel support
(2) Slide steel support
(3) Spherical support: also known as point support. In order to meet the requirements of the rotation of beret pieces in various aspects of the bridge, the contact surfaces of the upper and lower parts of the support are respectively made into convex and concave spherical supports with the same radius of curvature.


4. Reinforced Concrete Support

(1) Pendulum column support: movable support composed of reinforced concrete pendulum column. The shape and activity mechanism are the same as that of the single-roll steel bearing with cutting edge, but the middle part of the roller is replaced by short columns of reinforced concrete with rectangular section in the structure. The top and bottom of the roller are curved steel plates, which are often used for reinforced concrete or prestressed concrete beam Bridges with a span of more than 20m.
(2) Concrete hinge: a simplified bearing that reduces the section stiffness by reducing the concrete section so that a small amount of rotation can be produced and sufficient axial force can be borne.

5. Plate Rubber Support

A support consisting of several layers of rubber sheets and a variety of stiffeners embedded therein or consisting of only one rubber sheet. The shape has rectangle, trapezoid, circle and so on.

6. Basin Rubber Support

A large tonnage rubber bearing in which rubber blocks are placed tightly in a steel basin. The ultimate bearing capacity of the bearing is strengthened because the rubber block is subjected to three – way pressure.
Pull Support:
Also known as the negative reaction support, can simultaneously bear the positive and negative reaction support. It is divided into two kinds of pull hinge support and pull connecting rod support, and the former bridge support is divided into fixed type and movable type. The upper rocker of fixed hinge support is anchored at the end of the beam, and the lower rocker is anchored at the top of the pier or abutment. The movable bottom rocker is anchored between the pull-out blocks on the top of the pier or the top of the platform, and the bottom roller beret piece shaft is mounted so that it can be both pulled and moved along the longitudinal direction.

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