CGM grout material used for cantilever component reinforced misplacing and sinking produce crack and fracture of parsing

CGM grout material governance cantilever component cracks in the reinforced misplacing and sinking crack and craze, causing elements: (1 1) Cantilever component of negative bending in the build-in support the distance - — The tensile, compression below, contrary to the stress of the beam structure. The stress of the cantilever structure reinforcement should be in the above, if the wrong will suffer for jin run backward, will form a disturbance. （ 2) Operation is not standard, such as pick beam and slab concrete pouring, don't build operation channel plate, but trampled on the bar, always pick on the upper beam of the main steel sink, and then forming cracks or cracking. （ 3) Construction units in the cultivation of cantilever structure, insufficient, the right main rebar diameter or put the main reinforcement, or sinking displacement value is big, can weaken the carrying of cantilever structure, or on request of the concrete strength grade is lower than the plan early to open mold, the cantilever members along fixed end roots embedded cracks and broken. 2. Solution: ( 1) View is now in the crack of the cantilever beam rebar diameter, grade, the root number, if the diameter and root number less than or less than planning request, or steel bearing discrepancy compliance punctual, it is necessary to rework in time, replace the qualified steel. （ 2) Spotted the tear in the cantilever beam root, wide to zero. Seam 3 mm, grow up to half of the high beam, when the solution: (1) the cantilever concrete beam chisel, cut in the wall of built-in 300 mm above. (2) to correct the original steel bearing requests to the planning, add two ф 16 steel bar, and will bend near the anchor end in 90. Right Angle, in the main rebar center, on the surface of the manipulation of the main reinforcement layer maintenance is not greater than 25 mm, to maintain the main reinforcement didn't sink. Detailed vibrating compaction (3) when pouring concrete, it is necessary to anchor the concrete, wet maintenance of not less than 7 days. (4) when the member length less than 2 m to the planning of concrete strength standard value of 75% can dismantle; When the component length is larger than 2 m, concrete strength to reach 100% before open mould. （ 3) Cantilever beam roots have crack, slit width less than 0. 3 mm, length less than 50 mm, the solution: (1) the bottom die top bracing, the beam surface anchoring side within the scope of the chisel in addition to maintaining layer, view the main reinforcement without sinking. 2. Wash clean, concrete reinforcement of adding 3 root ф 12 on colligation or welded with stirrups and strong. (3) establish good template, preparation is greater than the C30 strength grade of fine stone concrete is poured concrete close-grained, smoothing, or choose 'CGM high-strength nothing shorten grouting material casting, wet maintenance of not less than 7 days.