The damage of concrete

Template flat-fell seam problem caused by the concrete quality defects phenomenon and reason: because the seam between the template is lax have clearance, slurry leakage occurring during concrete pouring concrete surface cellular, holes, serious emerging phenomenon. Its main causes are as follows: ( 1) Sample not serious or correct, template make careless, when assembling seam is too big. ( 2) Wooden template installation cycle is too long, caused by wooden drying shrinkage cracks. ( 3) Poorly made wooden template, flat-fell seam is lax. ( 4) When pouring concrete, wood template not watering humid in advance, make its expansion drive. ( 5) Steel template deformation failure to trim. ( 6) Improper measures of steel template juncture. ( 7) Beams and columns transition parts, the size of the joint and dislocation. Template flat-fell seam problem prevention measures: ( 1) - sample carefully, in strict accordance with the 1/10 1/50 will each partial detail into detail, detail note, after review and correct the serious to the operators so as to strengthen the quality consciousness of the workers, finalize the design templates and assembled carefully. ( 2) Strictly control the wood moisture content of the template, flat-fell seam when producing. ( 3) Wooden template installation period shoulds not be too long, concrete, wood template to water wet in advance, make its expansion drive thick seam. ( 4) Deformation of steel template, especially outside the side bar deformation, to finish straight in a timely manner. ( 5) Sealing measures to control between steel template, cannot use linoleum, plastic sheeting, cement bag, etc to sealing leak. ( 6) Beams and columns support to transfer part, flat-fell seam is tight, Add double sided tape) between seam when necessary Better to dislocation, correction. Concrete expansion mould quality defects caused by 1. Template expansion model problem caused by the concrete quality defects parts and the reasons of the phenomenon, : is in the cast-in-place beam, column, wall and floor of template deformation, lead to cast-in-situ thickness increases. Concrete expansion mould will cause component size, appearance is not neat, serious need to eliminate, affect the appearance quality of concrete. The prevention and control measures of concrete expansion mould 1 template design measures. 2 load combination: besides according to specification calculate the lateral pressure of concrete, concrete pouring methods should also be considered, stacking method, and the possibility of accidental loads. Panel 3 template design: all steel template, the layout of support, the bolt according to usually method, but the panel for MuZhu panel, sheet because of technical indexes of general dry conditions in the standard measurement, after the blisters will be a slight loss, so whoever USES wood, bamboo plate, suggest that the increase of its thickness is calculated for certain, wai purlin hoop spacing and the column spacing for appropriate reduction, the bolt arrangement spacing is also reduced. 4 for bolt layout: should be combined with the structural calculation setting, to the unfavorable setting to the part of the bolt, the support can be used for reinforcement. In addition, from the wall, floor space 200 ~ 250 ㎜ column template, 18 - to be embedded Under 25 steel leg, with a fixed template. 5 for floor support, should be based on the structure calculation, beam, plate racks are calculated respectively, and the supporting frame vertical rod arranged according to the actual design. Use secondary support system or quick release system, to draw the detailed figure auxiliary construction template. Angle of 6 to deal with the following problems: modular form, size, and the connection mode of wall and floor template; Template plate splicing method, big between the template and the template and the Angle of splicing method; Beam-column joints, column, floor and wall inside and outside two templates and support method. 7) Windows and doors hole template design, the reserved hole template and its support structure, installation, positioning way. 8) According to the actual circumstance of building structural design for template walkthrough, place the non-standard plates to facilitate processing in across sites. 9) Determine the template installation order, guarantee the quality of the overall assembly. The damage of concrete