Prestressed pipe pressure slurry before concrete pouring test project1

The position of construction joints shall be fixed before concrete pouring, shear force and bending moment are smaller and should be retained in the structure and is convenient for construction, construction joints should be set to horizontal or vertical plane. Handling of construction joints shall meet the following requirements: 1, deal with concrete surface layer of loose weak layer should be cut. The strength of concrete, the processing layer when cut hair by water irrigation, should reach zero. 5MPa; Artificial cut hair, should achieve 2. 5MPa; Using wind motive cut hair, ompa should reach 1. 2, after cut hair treatment of concrete surface, should be clean water is rinsed clean. 3, important parts and seismic requirements of sparse or reinforced concrete structure of reinforced concrete structure, prestressed pipe pressure slurry should be fill thrust fault in the construction joints is reinforced; There is a requirement for impermeability of concrete, the construction joints should be made concave, convex, or set the water stop; Construction joints for slope of casting or chisel into step. In environmental relative humidity, wind speed, smaller under the condition of large concrete, appropriate measures should be taken to prevent excessive water loss of concrete surface. During pouring concrete, prestressed pipe pressure slurry should check bracket, template, reinforcing bar, prestressed pipe and estimate a stable situation, and to fill in concrete construction record timely. The strength of the new concrete reached 2. Before 5 mpa, can not make it bear the pedestrian, transportation tools, templates, support and scaffolding and other load.