The sphere is auto parts in direct contact with the wheel of work load should have to meet the requirements such as: -Ensure the intensity. -Wear, flat car to run smoothly, without causing shock. -Fast drainage. -Weight light itself to reduce static load.There are 3 types of main spheres:4.1.1.1. Sphere by concrete Asphalt: Advantages, disadvantages and scope of application: -Sphere by concrete Asphalt waterproofing capable good quickly. -Create quieter road surface for airport runs, limited the shock force transmitted down a precast concrete sphere and noise restrictions. -Inexpensive sphere by precast concrete cement. -Low expectancy about 10 ÷ 20 years and get wear thus increasing costs and nursing. -At present the sphere by concrete asphalt are being applied phổbiến4.1.1.2. The sphere made of concrete cement:Advantages, disadvantages and scope of application: -Cement concrete bridge Surface has a lifespan of about 50 ÷ 60 years (higher sphere by concrete company Asphalt) and less wear and tear which reduces the cost of maintaining. -Spherical surface by BTXM capable of good waterproofing. -Road surface not smooth for airport runs, causing shock and force big noise when the car running over the bridge. -The price is more expensive than spherical surface with Asphalt concrete. -At present the sphere by little BTXM are applied.4.1.1.3. steel sphere: In the steel bridge, the static load đểgiảm the sphere can construct a sphere made of steel.¾ Pros, cons: -Texture the sphere of this type joined the same bearing beams as a bộphận of beams. -No need for configuration of water room because the steel used to make the sphere is steel type No rust. -This sphere Type satisfies requirements for use as flat level, roughness, copper time does not need to hệthống. -Request a users navigate to weigh ourselves lightly so it is especially appropriate to the long span when loaded by the static torque ratio and large loads. -This sphere type price is higher than the category in other spheres. -Online version of texture direction can apply for a spherical surface, or for both beams in the case of box beams.
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