Therefore, the product has been improved and improved in terms of performance and anti-condensation performance. Solved the problems of the protection and dew-condensation performance of the lighting cover (window) on the surface of large-scale industrial plants such as the roof of the house and light steel panels, and the defrosting performance of the multi-functional roof-lighting insulation was automatically turned on again. For the insulation performance of this product, due to At that time, the thermal insulation performance test could not be performed, and the structure of the product needs to be further improved so that it has a good thermal insulation performance.
For the above three problems, the practical application of more than 400 multi-functional sunroofs on the roof of the Changchun FAW Golf Sedan Assembly Plant was solved. However, due to the use of the color panel corner sashes, the influence of the color plate profiles on their own, There is a defect in the insulation performance of the sunroof base and the sash, and there is a condensation phenomenon. At present, domestic manufacturers still do not pay enough attention to the insulation and anti-condensation properties of sunroofs, and they should be developed accordingly. After several years of exploration, the author has found a basic method to solve this problem. In theory, the nodes of the multifunctional sunroof are handled more reasonably, so that the multifunctional sunroof achieves true thermal insulation and no condensation.
2 Application of Multi-functional Insulation Skylights In industrial production plants, fires often occur because the concentration of combustible gas is too high; or because of a certain gas content that affects people's normal work, causing physical and psychological harm. In order to take preventive measures before the occurrence of a hazard or cause people to be alert or alarm should be made to reduce hazardous gas concentrations, automatic discharge part of the gas, thus ensuring first author: LAID〗 964 male born in April master engineer 1 Background of the development of high-performance multi-functional insulated skylight As early as in 1991, the General Research Institute of Building Research of the Ministry of Metallurgy began the development and research of multi-functional insulated skylights, mainly based on the domestic Changchun Volkswagen Bridge Vehicle Assembly Plant (with an area of ​​nearly 80,000 M2) The requirements for ventilation, smoke extraction and lighting of the plant's roof surface system were put forward. The company has successively designed JL-type multi-functional sunroofs that can be opened with pneumatic components abroad and domestically produced windows and doors. The company used the color plated corner doors and windows to manufacture the first multi-colored sunroof-like window in China. It consists of two cylinders. Make power to open the sash. At the same time, structural performance, airtightness, and watertightness performance tests were performed, and good results were obtained. At the same time, several suggestions for improvement were proposed.
First of all, it is the problem that the sash is open and the folds are exposed when turning. This long-term exposure of the product to outdoor roofs will result in corrosion of the folds, which will affect the service life of the sunroof and the products. It is advisable to use an inline folding or to hide the rotating flap.
Second, there is the problem of exposure of the sealant strip. Part of the strip is exposed between the seal sash and the window frame. Although appropriate measures can be taken for the properties and quality of the strips, the use of better materials can prolong the service life of the strips, but it cannot fundamentally solve the phenomenon that the strips are exposed to the atmosphere and suffer from weathering and aging. Therefore, after aging of the strip, multifunctional sunroof products will experience severe degradation of H-tightness and watertight properties.
The need for normal production work for steel structures. A multifunctional sunroof is a good system to solve this requirement. The multifunctional sunroof can utilize the content of gas in the building for alarm ventilation. It can accomplish the following tasks by adding and setting some devices: daily ventilation. In case of inclement weather, an instrument with a rain sensor is used to automatically shut down the system so that the intrusion of moisture can be effectively prevented. The multifunctional sunroof can be controlled by a two-cylinder system or a cylinder with compressed air.
In the event of a fire, the thermodynamic automatic discharge device is opened at a prescribed temperature by a thermodynamic priority valve, or it is manually opened or completed through an automatic fire alarm device. At this time, the cylinder is driven by a C02 pressure gas box to complete the opening action.
When a certain gas reaches the specified concentration, the gas cylinder completes the opening action through the gas pressure box. The multifunctional sunroof system puts forward relevant requirements on the roof, such as problems related to temperature, insulation, wind force, snow load, noise prevention, and energy saving. The main application is natural ventilation; anti-bad weather ventilation; fire ventilation and natural lighting with a transparent roof.
The multifunctional skylight lighting parts include tempered glass, lead glass, hollow tempered glass, sun board, plexiglass, and polycarbonate lighting boards. The shape of A surface and surface type and so on. According to the needs of the appearance of shape design, which rotating flaps, sealing strips have a full hidden, can fully prevent aging or prevent corrosion.
(Continued from page 55) According to the prediction of offshore oil and gas in China, oil is 7 billion tons, and natural gas is 4.5 trillion m. At present, China has only found oil and gas of 20% and 7%, which shows that there are promising natural gas developments. China's natural gas resources are close to the economically developed regions on the southeast coast. Because of the high recovery of natural gas and less pollution, the accelerated development of natural gas resources has very good economic and social benefits. However, China's recent natural gas development is not yet able to meet the needs of coastal economic development. Therefore, it is necessary to consider the import of natural gas (liquefied natural gas LNG) from abroad, which requires LNG carriers. Alloy steel is required for cryogenic tanks of LNG ships.
In addition to the development of offshore oil, there are no longer detailed descriptions of the development of marine resources, the use of ocean energy, and the development of marine space. It is worth proposing the "Very Large Floating Structure (VLFS)" proposed in the use of marine space in recent years. This is a large-scale offshore floating structure measuring in kilometers, such as Japan's maritime airports and the future. The offshore factory and offshore city, the main body of the VLFS is a steel multi-mode structure, which is less harmful than the artificial island, but it has a series of new problems in design, construction, connection between modules, etc. ¥ Research, but also an interdisciplinary and cross-industry integrated project.The concept of building a large port of Shanghai, Ningbo, Zhoushan and the Shanghai, Zhou and Ninghai bridges recently proposed by China is also a grand vision for the development of marine space.
At present, the product has been used in large-scale industrial plants, lighting, ventilation, fire and smoke extraction of large-scale light steel structure color plate roof, through the improvement of its connection base, can be well connected with all kinds of pressure corrugated roofing. Its anti-seepage performance, thermal insulation performance has been fully guaranteed.
3 new development of multi-functional insulation skylights In the case of multi-functional sunroof itself in the airtight, watertight, structural performance is met, an important performance indicator is the product's own insulation properties. Through the analysis, the author tried to make several types of window sections. Through comparison and experimentation, the phenomenon of cold bridges and dew condensation of aluminum profiles has been effectively solved. Through the heat insulation, high-strength, lightweight connector, the aluminum profiles required for design are connected side by side and then sealed to form a composite aluminum profile. The aluminum can be processed into various window frames. And the window frame itself does not conduct heat inside or outside, ie it does not form a cold bridge phenomenon. The multifunctional sunroof base also has reliable thermal insulation and thermal insulation properties after similar treatment. The solution to this problem will greatly improve the insulation performance of the aluminum alloy window itself, and will open up a new way for energy conservation. It also made the multifunctional sunroof itself an important step toward civilian development.
4 Conclusion Due to the daily improvement of multifunctional sunroof products, its application will be universally promoted. It will also bring new light to the application of lighting, ventilation, and fire and smoke exhaust of large-scale light-steel roofing systems.
The 21st century is a new century of marine development. At present, our country has the basic conditions and strength to build a powerful ocean economy. In the near future, our country’s ocean engineering and marine development will surely have a greater development. As a result, China’s marine steel structure will also take a new step. In the new century.
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