Research On Interface Treatment And Overall Performance Of Rock Wool Composite Insulation External Formwork

Now,with increasingly shortage of resources and environmental pollution,it is very necessary to study the integration technology of building energy conservation and structure.This technology integrates the external thermal insulation and formwork engineering,combines the advantages of external thermal insulation and formwork engineering,and avoids the problems of fire and shedding in previous external thermal insulation engineering and resource waste in formwork engineering.It is a new energy-saving system.However,at present,there are few researches on the engineering performance of composite insulation exterior formwork,and there is a lack of cases to guide the engineering application.Therefore,this paper studies the relevant performance of the rock wool composite insulation external formwork,and at the same time,studies the performance of this type of formwork in the process of construction and use,such as the ability to withstand concrete side pressure and impact resistance,wind resistance,the effect under temperature load and axial load,etc.The purpose of this paper is to provide some guidance for the application of rock wool composite insulation exterior formwork in engineering.The main research contents are as follows:(1)The thermal performance calculation formula is used to calculate the thickness of the core material of the rock wool composite insulation exterior formwork for buildings in the cold zone A and the cold zone B in Heilongjiang Province.At the same time,the economic thickness can be obtained by comprehensive analysis of the annual cost,and the value of the core material thickness can be acquired by combining the thermal performance and economic efficiency.By using the calculation formula of thermal resistance of heterogeneous enveloping structure,the degree of reduction of thermal performance by different slotting forms and sizes is quantitatively analyzed.The influence of grooving on the flexural property was studied by using the finite element model of three-point bending,and the theoretical calculation formula was used to verify the flexural property.The influence of grooving on thermal and mechanical properties is analyzed comprehensively,and the suggestion of reasonable grooving form and size is given.(2)The load borne by the rock wool composite insulation external formwork in the construction process was analyzed,and the requirements for the bending strength and deformation value of the formwork system were used to check the main and secondary lines of the rock wool composite insulation external formwork system and the distance between pulling bolts.The impact theory is used to analyze the ability of rock wool composite insulation formwork to bear impact load during construction.The number of anchors required per unit area for the formwork at different building heights under wind load was calculated.In order to ensure the quality of the project,the key points such as the construction flow of the formwork in the construction process are explained.(3)The composite wall formed by pouring concrete is analyzed.Firstly,Finite element software is used to verify the stress and deformation of rock wool composite insulation external formwork under construction load.Then,the temperature field and stress field of the composite insulation wall under the load of temperature difference between summer and winter are analyzed,and the influence of the insulation transition layer,grooves and anchors on the temperature effect is studied.It can be seen that the thermal insulation transition layer can effectively prevent cracking under the action of temperature load.Grooving and the thermal insulation anchor and bolt will increase the stress of the outer reinforcing layer.Finally,finite element software is used to study the mechanical behavior of composite wall under axial load.