High-speed railway bridge girder construction of self-leveling bearing mortar ( Grouting material) The research and application

High-speed rail bearing grouting material of high speed railway bridge bearing mortar PuJia quality is an important link in the evenness of beam body force. Domestic girder erection has been gradually adopted load jack as a temporary support, between the bearing pad stone and bearing base self-leveling mortar materials into infill fall again after the construction technology of beam emplacement. In this paper, combined with the high speed railway engineering, the effect factors of self-leveling mortar performance test analysis, developed the construction performance is good, high early strength, compressive strength of 2 h & gt; 20 MPa, 24 h flexural strength & gt; 10 MPa, no rust, micro expansion, not bleeding, durable performance is good, self-leveling, self-compacting, CGM - that could satisfy the requirement of construction progress 320 bearing grouting material. Bridge PuJia quality is to guarantee the bridge beam body stress is an important part of the uniform. The traditional precast beam body PuJia method is the beam body directly placed on the dry hard bearing pad on the stone mortar, work hard mortar depend on the weight of it, and then anchor support bolt. This approach often leads to the beam body four fulcrum is not in a horizontal plane, produce three stress phenomenon, and cannot ensure the completely same four pivot bearing. A large number of research results show that the bridge bearing four protection uneven will impose additional stress on the beam body transverse, caused when large amount of uneven beam of roof and floor craze. Therefore, in the high speed railway bridge girder when no longer use this PuJia way. At present, the domestic bridge PuJia bridge shop according to the foreign successful experience, which is adopting beam falls on the first according to the leveling of CWR on bridge girder elevation, jack, and then in the gap between filling with bearing self-leveling no shrinkage grouting material ( Or use higher bearing adjustment) To avoid three-point loading phenomenon. Domestic girder erection of the requirement of technical standards have gradually adopted load jack as a temporary support, to ensure the four support beam counterforce difference within 5%, the bearing pad between stone and bearing base fell after the grouting material filled beam in place.