Talking about the Construction of the Waterproof and Insulation Composite Layer of the Now Sprayed Polyurethane Rigid Foam Roof

Construction Technology 29 49 Talk about the construction of the current spray polyurethane rigid foam roof waterproof insulation composite layer Pan Xingcan (舜杰建(Group) Co., Ltd. Chongqing 401320 warmth, reducing the construction process, eliminating the insulation layer construction on the waterproof layer Destruction, enhanced waterproof and thermal insulation effect, is a new high-tech roof waterproofing insulation material. This paper mainly introduces some construction techniques, construction methods and corresponding quality and technical safeguard measures during the construction process.

Key words: waterproof; heat preservation; construction technology; construction method; quality technology waterproofing and heat preservation is the most important link in roofing engineering, especially the quality of residential building roof waterproofing, directly related to the interests of the owners, affecting the real estate Overall quality. The quality problem of roofing waterproofing is mainly due to the design of the factors of waterproof material selection and construction quality. During the construction process, there is always a problem that directly affects the waterproof quality of the roof. After the waterproof layer is completed, in order to protect the waterproof layer during the construction of the insulation layer in the next process, a layer of cement mortar or fine must be made on the waterproof layer. Stone concrete protective layer, after the protective layer reaches a certain strength, the construction of several processes after heat preservation and other subsequent processes will be carried out, and the construction of these several processes will directly or indirectly cause damage to the waterproof layer, resulting in leakage of the roof, and at the same time This traditional roof waterproofing and insulation practice is complicated by the many processes.

Recently, the roofing project of a residential district in Chongqing used integral polyurethane foam roof waterproof insulation material, which is a high-tech new roof waterproof insulation material that integrates waterproof and heat insulation. It will be waterproof, heat-insulating and waterproof. The construction of the road process is simplified into a process of construction, which not only reduces the construction process, but also eliminates the damage of the waterproof layer by the construction of the insulation layer. Scientifically identified, the material's thermal insulation energy-saving effect is much better than the traditional roof waterproof insulation method, which is more advanced and scientific. Here, some introductions are made to its construction technology and construction methods.

Construction conditions: Since the integral polyurethane foaming construction is directly applied on site, environmental temperature, air humidity, wind and other factors will directly affect the quality of the foam. Therefore, the atmospheric temperature at the site during construction must be no less than 8C, the relative humidity of the air should be less than 90%, and the wind should be less than 5 levels for normal construction.

Base conditions: (1) The drainage slope of the roof base should be 2 2%, and the vertical drainage slope of the gutter and gully should not be less than 1%. (2) The surface of the sputum coating is solid, dry, free of floating ash and oil. The most basic requirement of the polyurethane field foam for the base layer is drying and leveling. If there is water on the surface of the base layer or the moisture content of the base layer is high, an exothermic reaction will occur when the smear is applied to the base layer, and the water in the base layer will be formed when the foam is formed. Perforation occurs in the foam formed by inhalation; the foam is not firmly bonded to the base layer, and it is easy to cause shelling and hollowing. (3) The pipe that exits the roof should be provided with waterproof casing before the construction of the shovel, and the mortar should be made into a small garden file to facilitate uniform construction of the shovel and slippage at the joint. (4) The upper part of the vertical water outlet should be level with the leveling layer. (5) The joint between the parapet wall, the gutter and the protruding roof structure (yin and yang angle) should be curved, the arc must be densely bonded to the base layer and there is no shelling or crack, and the arc radius is R=80mm100mm. (6) The equipment, pipelines, etc. on the roof should be installed in place before the construction of the polyurethane rigid foam waterproof insulation layer to avoid damage to the surface of the waterproof insulation layer. The connection with the base layer is the same as that of the roofing pipeline.

Equipment requirements: the use of professionally produced polyurethane special enamel coating equipment and air compressor, sputum coating equipment consists of the main engine pressurized feeding system, pipeline conveying system, sputum coating system. The raw materials are mixed and formed by a mixing pump and a heating pipe at a constant temperature conveying mixing chamber.

Introduction of raw materials: The use of isocyanates, polyols and foaming agents and other additives, through the construction of the Chongqing construction site, the high closed porosity has a waterproof and thermal insulation integrated function of the type of rigid polyurethane foam.

Construction steps: (1) Pre-treatment of the special part of the joint: Before the sputum coating, the nodes such as the roof pipe and the shovel are made to be treated according to the site conditions.

(2) smear operation: before the smear application, the special layer of air pressure is used to clean the base layer; the spot smear is used for special squeaking, the smear should be evenly connected, and each working surface is sprayed at least twice, each layer is 10mm15mm or so, because each time after smearing, a skin is formed on the surface to increase its waterproof performance. The total thickness of the polyurethane foam after completion should not be less than 20mm; the foaming stability and curing time of the polyurethane rigid foam is about 15 minutes. Therefore, it is strictly forbidden to use the person within 20 minutes after construction to prevent damage; after completion, the reinforced fine stone concrete is used as a protective layer.

Vertical water outlet node: horizontal water outlet node: roof and gable, daughter wall flooding node: pipe joints of the roof: 4 polyurethane waterproof insulation operation special quality assurance measures before construction: (1) professional construction management standards to construction The team will provide a written basis for technical, quality, safety and construction schedule requirements, so that the operation team will not be blindly constructed. (2) The raw materials shall be inspected by the technical department of the factory before leaving the factory, and the factory shall be used after inspection.

During construction: (1) The thickness of the polyurethane rigid foam waterproof insulation layer should reach 20±(2) The surface of the polyurethane rigid foam waterproof insulation layer should be flat, and there should be no drum or breakage. (3) The performance index of thickness, thermal conductivity, dimensional stability and water impermeability of polyurethane rigid foam materials should meet the main performance indexes of polyurethane rigid foam waterproof insulation materials. (4) The surface drainage slope of the level, gutter and gutter should meet the design requirements. The continuous mode and structure of the connection between the roof and the gable, the parapet, the gutter, the gutter and the shuttle roof structure should meet the design requirements. .

(5) When the site is painted, the operator and the sound maintenance worker shall control the sound setting, discharge and foaming status, and adjust the abnormality in time. (6) When painting on site, the quality personnel should follow up the inspection to see if the thickness and foam quality meet the requirements. If it is not satisfied, it should be stopped or re-treated. (7) The foam was randomly sampled at the time of smearing, and the performance of the waterproof insulation layer was tested. (8) The protective layer on the surface of the waterproof insulation layer should not have cracks or peeling.

After the completion of the construction, a professional company will send a special person to the surface layer for random inspection. After ensuring that the quality requirements are met, the inspection can be carried out. If the problem is found, it must be checked in all directions, and then submitted to the supervision unit for inspection; the fine stone concrete rigid waterproof layer construction Before, it is necessary to supervise and protect the polyurethane waterproof insulation layer; after the completion of the project, the professional construction unit organizes personnel to return to the site regularly, and if there is any problem, it should be dealt with in time.

The acceptance of concealed works shall meet the requirements of the code; the number of batches for quality inspection and inspection batch shall comply with the requirements of quality acceptance specifications; the acceptance of polyurethane rigid foam waterproof insulation project shall be in accordance with the technical specifications of CR polyurethane rigid foam waterproof insulation engineering. The procedures specified in CT017-2005 shall be accepted; prior to the acceptance of the project supervision and acceptance, the quality personnel shall complete the inspection procedures and form a document.

6 Quality control of raw materials, finished products and semi-finished products All materials used for roof waterproofing and insulation project shall have product quality assurance information and be submitted for project supervision and acceptance; for the materials required to be inspected, the next station shall be sampled and sent for inspection. The test results must meet the design or quality acceptance requirements; for the sounds entering the site, the product combination certificate must be presented and the operation must be normal; the materials that have doubts in the production process should be checked by the quality staff immediately, and ensured. Continue to work without any mistakes; the polyurethane material should be tested by the manufacturer before leaving the factory, and can be used after delivery.

7 quality common disease prevention measures polyurethane waterproof insulation leakage prevention: (1) can not be free to break polyurethane rigid foam waterproof insulation layer and leak-laid plastic film, can not be inserted into the polyurethane rigid foam waterproof insulation layer, resulting in foam damage Causes water leakage and water seepage on the roof; damage should be found before the concrete is poured. (2) The plastic film should be completed within one week of completing the polyurethane rigid foam waterproof insulation layer. (3) When transporting or working on the polyurethane surface layer, wooden board protection should be laid. (4) It is forbidden to cut the polyurethane surface layer with a sharp tool. Once found, the professional construction team should be notified in time to repair.

Leakage prevention of roof joints: Before the construction of polyurethane waterproof insulation layer and fine stone concrete rigid waterproof layer, the engineering of the previous process should be completed to prevent leakage at the joint.

Advanced and scientific waterproof and thermal insulation materials and strict construction and quality technical support measures are in place. The waterproof and thermal insulation effect of the double roof is better, and the complaints about roof leakage will be less and less.

Responsible Editor: Before the economization of the Energy Conservation and Construction Department of the Ministry of Construction and Energy Conservation, the Ministry of Construction and the Ministry of Finance jointly issued the “Implementation Opinions on Strengthening the Energy Conservation Management of Office Buildings and Large Public Buildings of State Organs”.

The opinion pointed out that the focus of energy conservation work this year and next year is to set up provincial and municipal offices with large concentration of office buildings and large public buildings in state organs, establish a national government office building and large-scale public building energy conservation supervision system, and carry out energy consumption statistics, energy audit, energy efficiency publicity, etc. . On this basis, research and development of energy use standards, energy consumption quotas and over-quota increase, energy-saving service and other systems, and gradually pushed across the country. The opinions also provided the implementation plan for the construction of the energy-saving supervision system for office buildings and large-scale public buildings of state organs.

The opinion calls for strengthening the whole process supervision of implementing energy conservation standards. In the whole process of the construction of office buildings and large-scale public buildings in state organs, the building energy-saving standards are strictly implemented. In the planning and project-building stage, the energy consumption standards are used as the mandatory threshold for the construction of national government office buildings and large-scale public building projects. Construction permits shall not be issued if the construction drawing design documents are not reviewed. After the completion of the project, special assessment of building energy efficiency must be carried out. If the energy-saving mandatory standards are not met, the relevant departments may not go through the procedures for completion and acceptance of the sound.

The opinions emphasize the implementation of the main responsibilities of all parties involved in the project construction. The construction unit shall entrust the architectural design of the project in accordance with the corresponding building energy conservation requirements. Completion acceptance should include the inspection of the implementation of mandatory building energy standards. The design unit must strictly follow the relevant energy-saving, land-saving, water-saving, material-saving and environmental protection standards. The construction drawing design document reviewing agency shall separately list the contents of the building energy conservation special review in the review report, and if the review is not correct, it shall not pass the construction drawing review. Construction and supervision units must strictly implement various energy conservation measures in the design documents to ensure quality.

The Ministry of Construction has discharged the schedule of energy-saving work for office buildings and large-scale public buildings of state organs, and jointly promoted the energy management of office buildings and large-scale public buildings of state organs by the financial departments of the United Nations. (Selected from China Wall Material Network)

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