Architectural template of the new wood-plastic composites
With the rapid development of the construction industry, the demand for concrete construction template is increasing. Of construction commonly used template for the plywood template, its raw material is wood, a lot of use not only a waste of forest resources, harm the environment, new materials and structures of new forms of development template around the corner. Wood-plastic composite materials make full use of waste plastic and wood waste and other waste, the process is simple, low cost, provide a new way for the development of new construction template. On the basis of analysis of the application status of domestic and foreign construction template, give full play to the advantages of wood-plastic composite materials, environmental protection, inexpensive, new wood-plastic construction template, and using a combination of experiment and numerical simulation of wood-plastic template The physical and mechanical properties of the system, provides a useful basis for the promotion of new wood-plastic construction template, main contents and results are as follows:
(1) in accordance with the specification, three wood-plastic construction template for PE, PP and PVC the sheet physical performance test, including the sheet moisture content, tensile strength, flexural strength, elastic modulus, and wood-plastic solid core board according to the experimental data. Test and analysis results show that: PVC-based wood-plastic materials with high strength and modulus of elasticity and low moisture content to meet the actual needs of the project; subject to the same carrying capacity conditions, the PVC-based wood-plastic solid core board design minimum thickness, the best mechanical properties.
(2) designed three different cross-section form of wood-plastic composite materials based on PVC based wood plastic empty core template (rectangular hole, square hole and hole-type), the ANSYS finite element software for the wood plastic empty core structural template carrying capacity and deformation capacity analysis. The analysis showed that: the new wood-plastic hollow-core template to meet the carrying capacity requirements, the bearing capacity and deformation of the template size change the template will have a greater impact; under actual load conditions, the air core template support spacing should not be greater than 400mm, controlled at about 300mm, effectively reducing the amount of support the use of square timber.
(3) the smallest wood-plastic hollow-core template for the target, using the ANSYS optimization module to optimize the size of the wood-plastic hollow-core structure template, the optimal value of the size. The optimization results show that: first-order method for solving the most accurate template is optimized to meet the stress and deformation size of 5mm × 12mm × 32mm × 25mm × 1200mm, optimization, the force is reasonable, both to ensure that the template structure security reduce the cost of the product.
(4) in accordance with the specifications for the new steel frame – wood-plastic (PVC base) combined template design, calculation method, based on the theoretical works of the combined effect of checking the combination of template under different load deflection. The results show that: when the load values ≤ 70KN / m ~ 2, the value of deflection control in less than 3mm steel frame – wood-plastic composite template has good mechanical properties and fully qualified for the template of the construction work.
(5) based on building the technical and economic evaluation principle, the economic analysis of the three forms of template. The results show that: PVC based wood plastic template due to the good mechanical properties and low material cost to the template lowest cost, can be a good alternative to bamboo (wood) plastic sheet, wood templates solid core templates, and low cost; in during construction of the Northern winter, wood plastic empty core structure template, use costs can save 50 percent more than plywood and saving insulation measures costs; when the template works, there are strict requirements need to use steel template, steel frame – wood-plastic The combination of the template instead of the lower cost of recycling converted.