[Grid] bearing steel construction process: Grid 1, construction preparation (1) Material 1) steel truss installation of steel and connecting material, high strength bolts, welding rod, wire, flux, etc., shall meet the design requirements, and should have factory certification. [Grid] bearing steel truss mounting hollow solder balls, solder balls stiffened, bolts ball, semi small fight unit, lever, Hainan grid spacing sliding bearings and rubber bearings and other semi-finished products, It should meet the design requirements and the corresponding national standards. [Grid holder] (2) The main equipment: welding, oxy - acetylene cutting equipment, wheel saws, lever cutting lathe and pole cutting power head, steel tape measure, steel ruler, caliper, level, theodolite, an ultrasonic probe; flaw detectors, magnetic detectors, lifting equipment, lifting equipment, hammer, wire brush, hydraulic jacks, and so on down the chain tool. (3) Operating conditions: [grid] before installing the bearing grid bearing axis response level to carry out inspection line inspection. Grid axis, elevation position must meet the design requirements and related standards. After 2) Before installation check the strength of concrete response capitals, capitals of concrete strength must meet the design requirements and current national standards, can be installed. 3) When using high-altitude slip method to deal with pulley sliding track inspection, slip slope level should be consistent with the requirements of the construction design. [Grid] using strips bearing block installation, sliding table method, response surface table, slip device check and test taxi tests. Ball bearing has the following advantages: (1) by a spherical ball bearing force transmission, and thus more evenly applied to the supporting concrete reaction force. (2) The rotational torque of small ball bearings. Rotating torque and bearing only the spherical radius and PTFE plate sliding friction system, not to the size of the bearing angle of the grid spacing slip drawn carriage, thus especially suitable for corner bearing, grid limit Bit slip bearing price, design 0.05rad corner to play more. (3) ball bearings to rotate each consistent performance for curved bridge and wide bridge. (4) ball bearings are no longer used in rubber bearing, rubber hardening or aging affect more bearing rotation performance does not exist, especially for low-temperature region. Ball bearing plane sliding friction mechanism with rubber bearing basin is exactly the same. In the study in rubber bearing basin of PTFE plate and stainless steel plate (1Cr18Ni9Ti) the friction has done a lot of tests, in order to enter [further reduce bearing friction and wear, PTFE in ball bearing plate surface embossed with storage pit, and grease painted 5201. Diameter of test bearing PTFE sheet is 300mm. In grease lubrication friction characteristics of PTFE plate with no grease lubrication are still similar to the coefficient of friction of PTFE sheet with increasing pressure while being lowered, after the first of friction, the friction coefficient decreased to a stable value, However, the initial value of the difference between the beginning and stable value than that without grease dry friction is small.