Application of External Wall External Insulation Construction Technology in Energy Saving Reconstruction Engineering of Existing Residential Buildings
The gas exhaust pipe is installed, and the exhaust pipe is exposed to the outer wall and will pass through the heat preservation system. The high temperature during use may cause a fire hazard; the original building fire evacuation function is lacking, so the external thermal insulation technical solution should adopt the heat insulation system as much as possible. Technical measures for fire performance.
Because during the use of the building, the residents' transformation and decoration of the joints such as the window opening and the mouth make the joint parts different in shape, which is not a common practice, and is also a problem faced by the energy-saving renovation of the external thermal insulation construction.
2Solutions 2.1 Test and treatment measures for the base surface condition The external insulation construction base of the existing residential building should be inspected in detail. Through inspection and analysis, it is confirmed that it has the bond strength with the bonded mortar used: B ―The measured bonding strength of the base wall and the bonding mortar used is strong—the bonding area ratio.
Through the drawing test, the average tensile bond strength of the outer wall surface coating layer and the concrete base surface was 0.53 N/mm2, and the lowest value was 0.40 N/mm2; the average tensile bond strength of the bonded mortar and the coating surface It is 0.37N/mm2, and the lowest value is 0.28 N/mm2. The average bond strength and the minimum strength of the two interfaces are much higher than the tensile bond strength of the polystyrene molded plate itself 0.1N/mm2, which can be seen in the original The insulation layer is pasted on the paint layer to meet the strength.
According to the test results, the bonding method of directly bonding the polystyrene board after cleaning the wall surface is adopted to ensure safety, and the bonding area ratio is not less than 50%. 2.2 Existing building thermal insulation system fireproof technical measures 2.2.1 Installation of rock wool The fire-proof belt adds fire-proof isolation belts to the external thermal insulation structure of the energy-saving renovation project, which plays a key role in improving the fire safety performance of the buildings and ensuring that residents escape in time when they encounter fire. The fireproof material used in this project is rock wool which is close to the thermal conductivity of the thermal insulation board. The key to installing a fire barrier is to ensure a secure connection to the wall. The main material of the fire barrier is a product of rock wool wrapped polymer mortar. Install the rock wool fireproof isolation belt on the upper side of the window opening, the width is 200mm, the length is the width of the opening plus 600mm, and the side of each opening extends 300mm. Before installation, 2mm thick polymer mortar is applied on the surface of the rock wool board, and the glass fiber is laid. The net is used as an enhancement layer. Because the rock wool is soft and self-important, in order to prevent the deformation of the fireproof belt, the rock wool board is connected with the wall by means of a nail-bonding method, and the bonding is full-stick, and the fixing member is a large-plate anchor with a diameter of 150 mm.
The main fire hazard existing in the external thermal insulation system of this project is the gas exhaust pipe distributed in various parts of the external wall. The exhaust pipe passes through the insulation material and is used at a high temperature enough to cause the polystyrene board to burn. For this part, the rock wool fireproof material with the thickness of the heat preservation material is attached to the periphery of the exhaust pipe with a radius of about 200mm. The plaster is adhered to the base surface with a full adhesive, and fixed with a large plate fixing piece to ensure fire prevention. The material is safely connected to the base.
2.2.3 External thermal insulation node treatment technology to deal with the construction problems of existing building external thermal insulation nodes, combined with the specific construction environment, based on the principle of comprehensive insulation, connection safety and convenient operation, researched a set that can completely block the thermal bridge, and A technical solution that ensures construction quality and is quick and convenient to operate. The project carried out the technical treatment of the 4-gas exhaust pipe gas exhaust fire prevention technology on different nodes, and adopted the technical measures to introduce the finished components of the node, which not only satisfied the safety and performance of the insulation system, but also ensured the system. The quality of the finished product raised the construction efficiency.
2.2.3.1 Window exterior insulation details The main problem of the insulation node of the residential building energy-saving renovation window is that many households have been replaced and modified, and the relative positions of the window frame and the structural wall have changed greatly. The window frame position of the household mainly has two cases: the window frame is located near the center line of the structural wall and the outer side of the window frame is flush with the outer edge of the structural wall. For the first case, the polystyrene board should be attached to the side of the structure outside the window according to the local standard, and sealed at the junction of the heat preservation and the window frame; and for the second case, the window frame is closely attached to the outer edge of the structure. After pasting the outer wall insulation board, the insulation board and the insulation window frame have formed a broken bridge, and the outer side of the window can be directly closed with a polymer mortar and sealed.
2.2.3.2 Installation of the sill drip plate The aluminum drip plate is used to directly direct the rainwater to the outside of the wall to avoid the dynamic characteristics and seismic performance analysis of the water over-limit high-rise structure. Fan Weixia, Zhao Qunchang (Shenzhen Municipal Design and Research Institute Co., Ltd., 518029, Shenzhen, Guangdong) The meta-software Etabs analyzes the structural dynamic characteristics of the building, determines the reasonable vibration mode participation of the mode decomposition method, and analyzes the seismic response of the structure under the most unfavorable seismic wave by elastic time history method. The structure conforms to the current national norm requirements, and the calculation methods and conclusions have certain value for the calculation of over-limit high-rise buildings using finite element software.
The construction area of ​​a project is about 114575m2, the plane size of the main building is 64mx32m, the aspect ratio H/B is 5.47, the aspect ratio is 2.0, the frame-core tube structure, the total height is 175.05 m, and the basement depth is 9.5m. Above ground 42:2010 -12-20 division, the main research direction is building structure, municipal public structure design and research, e-mail: fwx820926163.com. Contaminated wall surface flowing down the window, aluminum drip board and window frame node using sealing strip and silicone glue Double waterproof measures for excellent water resistance. In addition, the aluminum drip plate also enhances the load-bearing capacity of the window sill.
2.2.3.3 Window side processing technology The expansion sealing seal is added on the insulation layer and the side of the window to improve the waterproof performance.
2.2.3.4 Other node processing technology The application of node components greatly improves the efficiency of the construction of existing building energy-saving renovation nodes, and enhances the functions of drainage and waterproofing of the joint parts, which is worthy of promotion in the energy-saving renovation of existing buildings.
Install the drip sill and the male corner member. This project uses pre-embedded drip æª prefabricated parts to solve the dripping treatment problem of the insulation window.
Install the male and female corner members. After the polystyrene board is installed, before the bottom layer is smeared, the angled mesh members are embedded in the yin and yang angles to reduce the yin and yang smears, and the underground 2 layers. The bottom 4 tier podiums are mainly used for business and entertainment, 5~ The 9th floor is the hotel and the 10th floor is for office use. The height of 1 layer is 6m, the height of 2~4 is 4.5m, the height of 5th is 4m, the height of 6~25 is 3.2m, and the height of 26th is 5.15m. 1 The finite element calculation model soil is Class I, the intensity of the fortification is 7 degrees, the design of the ground ash is difficult, and the construction quality is easy to guarantee.
3 Conclusion In the energy-saving renovation of residential buildings, the problems faced by external thermal insulation construction are mainly diversified base conditions, complex construction environment, flexible and diverse node forms. The starting point for solving the above problems is that the insulation performance meets the energy-saving requirements, the structure connection is safe and reliable, and the construction operation is convenient. The specific technical measures and suggestions include the determination of the base surface treatment plan through the test of the monomer engineering base surface; the rational use of the finished component; the node detailing method according to the specific situation. After the completion of the energy-saving renovation project, there are no quality problems such as cracking, leakage, and empty drums within 3 years after completion, and the thermal insulation effect is good. After testing, the thermal insulation performance fully meets the requirements of 65% energy saving in Beijing, and the energy-saving renovation work of existing buildings is completed. Carrying out value.
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