Bridge bearing grouting material crack reason and prevention and control

Bridge bearing grouting, grouting material bearing price high-strength non-shrink grout material occupies an important position in the bridge construction, but in the process of bridge construction, it is easy to crack. The appearance of cracks will not only influence the engineering quality, even lead to bridge collapse. If effective measures are taken, many cracks can be avoided and controlled. In order to avoid harm larger cracks appear in the project, especially for grouting material Bridges in the cause of the cracks in the construction process has done more comprehensive analysis, the summary, in order to take effective control measures in the construction, ensure the engineering quality. A grouting material structure of the main causes of cracks in 1. Due to the change in temperature cracks. As the change of temperature, temperature cracks or expansion or fold is compared with other cracks of the biggest characteristics. 2. Due to the shrinkage cracks. This is the main reason of the crack grouting material volume will be in shape and shrinking contraction and deformation in the process, resulting in crack. 3. Foundation deformation caused by the cracks. Component's internal additional stress due to bridge engineering construction to vertical uneven settlement of foundation and the poor lateral horizontal displacement, the tensile strength of grouting material institutions can no longer will have cracks when the load stress. Two cracks prevention measures 1. Design crack control measures are: to avoid the crack load, should try to avoid institutional mutation or section mutation; If structure mutation is inevitable, it should do a good job in details, such as do the rounded corner, mutations in place to make the gradient transfer, at the same time, strengthen the structure reinforcement, in order to improve the crack resistance of the grouting material. For prevention and control of stiffness caused by corrosion cracks, the crack width should be in strict accordance with the specification requirements in the design of control, adopt enough protective layer and anticorrosive grouting material. 2. Crack control measures: before binding reinforcement, thorough cleaning work should be done firstly in order to ensure that the use of steel quality. Reinforced in plants after molding, centralized oil shipped to the site for installation, strictly grasp the reinforcement spacing during installation. Steel specification, type, quantity, spacing, geometry size, location and quality shall meet the requirements of the drawings and construction specifications and strict raw materials and joint test. In the reinforced layer spacing should be adequate spacing, reinforced outer layer between the template and have a certain grouting material block should be set up.