Application of new technology of composite insulation wall
in order to protect land resources, the Ministry of construction has determined that 170 large and medium-sized cities in the country will phase out the use of clay bricks within a time limit, and has set June 30, 2003 as the deadline. Qinhuangdao Yaohua Jian'an Engineering Co., Ltd. seizes the opportunity to grasp the situation and is committed to the development and construction of new energy-saving housing. Since 1998, shear wall construction technology has been developed, and the first energy-saving demonstration community with a construction area of 100000 square meters in Qinhuangdao city has been built in 2000. Five advanced construction technologies such as shear wall structure, internal insulation of external walls, external insulation of external walls, floor radiant heating, and eight new energy-saving materials such as steel plastic composite pipes, UBR toilets, and composite polystyrene boards are used in the community, which makes the building have excellent energy-saving, land-saving, and seismic performance. After the building compliance test by the competent department, the building has reached the national phase II energy-saving target of 50% in advance, The community was rated as "Hebei Construction Industry from the current research results at home and abroad, recycled plastics are mainly used to make a variety of heat insulation building materials, new technology application demonstration project"
aiming at the wall insulation technology mastered in the construction of the demonstration community, the company organized relevant engineering and technical personnel to tackle the key problems of the composite insulation wall in 2001. After repeated demonstration. Three kinds of insulation materials were selected for the experiment, two of which are the double-sided steel wire frame polystyrene insulation board and single-sided steel wire polystyrene insulation board, which are widely used at present, while the other one tentatively chose the polystyrene free version, and cast the cast-in-situ concrete shear wall and the polystyrene board at the same time to form a composite wall, that is, the concrete and the polystyrene board are self adhered. Using the above three kinds of exterior wall insulation materials and construction methods to carry out the performance experiment of single building composite wall, a breakthrough has been made. The results show that the self bonding process has the advantages of simple construction process and easy operation. In particular, the non polyphenyl insulation board has obvious advantages that the other two insulation materials do not have. First, the insulation performance is strong. After testing, due to the metal frame inside the other two insulation materials, there is a phenomenon of heat loss caused by the cold bridge effect of metal wires. Among them, the polyphenyl insulation board with double-sided steel wire frame loses more than 20% compared with the non insulation board, The appearance of heat dissipation fixture of single-sided steel wire polystyrene insulation board is also different. 3 When the oil return valve is opened, the loss of heat is more than 8%, while without polystyrene board, there is no heat loss caused by this factor; Second, the cost is low. Based on the current market price, the price of non polystyrene board is more than 65% lower than that of the other two materials on average; Third, it overcomes the wall cracks existing in the other two materials, which are also common in the field of building insulation at present. So far, Qinhuangdao Yaohua construction and Installation Engineering Co., Ltd. has initiated a new process of "shear wall external insulation composite wall" formed by pouring polystyrene board and cast-in-place concrete wall at one time. The above performance has been tested by the civil engineering testing center of Tianjin University, which fully meets the quality requirements of construction projects. In December, 2001 and February, 2002, the technology was officially accepted by the State Intellectual Property Office and obtained invention and utility model patents
in order to further reduce the project cost, the company also adopted another patented technology - "scattered bamboo plywood support and reinforcement system" when building the model building. Bamboo formwork is one of the new materials promoted by the Ministry of construction. It has low comprehensive cost and short production cycle. However, the large bamboo formwork in the market is easy to deform and has low reuse rate due to the problems of complex formwork card, large fixed spacing and lax fixation, which leads to the decline of wall quality and the increase of cost due to the repair of defects. In order to overcome the defects in the use of bamboo formwork, the company decided to change the large formwork into small formwork, complete with its own designed special fixtures and other fixed parts, and form its own complete set of bamboo plywood formwork support and reinforcement system. During construction, first bind the reinforcement according to the design thickness of the wall, support the formwork on both sides of the reinforcement, connect the formwork into a large area with special fixtures, then pour concrete, and finally remove the formwork, and the wall is formed at one time. The wall surface of such a wall is flat without plastering, ensuring that the thickness error of 140mm wall is between 0 ~ 2mm. This patented technology has the advantages of simple processing, short production cycle, low cost if the oil viscosity is too high, no large lifting machines and tools are required for construction, convenient handling, labor-saving, fast support speed and so on
the energy-saving model building built with composite thermal insulation walls and bamboo plywood support and reinforcement system is warm in winter and cool in summer. Under the same conditions, the temperature in summer is 1 ℃ ~ 2 ℃ lower than that of other walls, and 2 ℃ ~ 3 ℃ higher in winter, saving heating and cooling costs. This technology has brought the revolution of building walls and promoted the development of building energy-saving technology
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