| Shorten the removal time, improve the recycling rate templates, improve the quality of molded concrete structure, technical problems resolved in the new project template.Aluminum early dismantling formwork system application technology, both to improve the template material, but also improves the efficiency of construction and concrete structures forming quality, and has broad application prospects.Aluminum template system and a system consists of two technical components, namely,formwork system, technical support system early demolition. This paper relies on supporting the Great Hall of Guizhou Province five-star hotel complex building construction projects in aluminum formwork system using live, theoretical analysis and field test methods to verify the combination of computing, technical studies for the early demolition, the main research work and the results obtained are as follows:First, from a technical and economic point of view indicators, a detailed analysis of aluminum and steel template template, the overall efficiency of traditional wooden template,the results showed that: in high-rise buildings and large space buildings and other large projects, the use of aluminum template has many advantages, can produce better social and economic benefits.Second, the use of new maturity was established early concrete strength prediction and removal time projection formula, calculated using a formula calculated by relying on the subject location in Guiyang engineering examples winter(December to next February)Monthly reach slab formwork construction early dismantling time required strength, that do not add additives(early strength agent, antifreeze) of C40 Portland cement concrete slab early dismantling of age are as follows: December about 7.2 days(172.8 hours) in January about 8days(192 hours), February is about 7.2 days(172.8 hours), mixed with additives other specific analysis according to actual conditions. Real-time assessment of the actual strength of concrete, conditions can be monitored in real time to respond after the early demolition of the structure, strength and form removal time are conducive to determine accuracy.Third, the combination of real-time measurement of the strength of concrete at early age,SAP2000 numerical simulation and floor slab in response to the measured results comparative analysis and support system stability checking system, studies show that: this issue by relying after instances of aluminum formwork early split, on the floor construction work load on the floor structure has little effect, supporting the stability of the system to meet the "steel design Code"(GB50017-2003) requirements, and technology and management from two aspects proposed control measures to prevent cracks in the top plate.Fourth, the method of MIDAS / Gen finite element analysis of the factors affecting the aluminum template early dismantling were studied. The results showed that:(1) top of theboard stress on the concrete strength is not sensitive; high strength concrete is more suitable for aluminum template early dismantling;(2) split after the die strength of 60% strength design value, more conducive to safety and quality of the concrete structure after demolition early template;(3) thicker slab thickness, tensile stress smaller top plate, the better resistance to cracking, larger projects slab thickness more suitable for early dismantling aluminum template construction process.(4) support spacing ≤1.5m, the support bar at the top of the slab tensile stress value change is small, more conducive to early dismantling; bear a greater load floor slabs, aluminum formwork design template should be removed as soon as possible the construction control support spacing ≤1.5m, otherwise there will be cracks in the floor hidden;(5) floor load, the greater the top plate tensile stress; when subjected to uniform load,tensile stress amplitude smaller top plate, the top plate of the tensile stress uniformly distributed load insensitive, That uniform load in the form of an aluminum template is more conducive to early dismantling construction. After the end of mold removal, control the size of the load floor work construction, and materials as far as possible Heaping uniform load appears conducive to early dismantling aluminum template. |
