The "Foundation of Solid Wood Composite Doors" and "Code for the Classification of Wooden Door Enterprises" was initiated by the Ministry of Commerce. The "Wooden Doors" and the "Classification Rules for Grades of Wooden Door Enterprises" under the supervision of the Wood Door and Window Professional Committee of the China Wood and Wood Products Circulation Association The preparation of the industry standards was started in Beijing on June 12, 2012 at 10:00 am. The heads of the Wood Door and Window Professional Committee of the China Timber and Wood Products Circulation Association and some outstanding enterprises from North China participated in the meeting. This also marks the introduction of the fourth and fifth industry standards in China's wooden door industry has been put on the agenda. The wooden door enterprise wants to see the sun and see the hope that this standard preparation start-up will be held in Beijing Boyi Chuangzhan Wood Industry Co., Ltd. Executive Vice President of the Wood Door and Window Professional Committee of the China Wood and Wood Products Circulation Association, and Wang Xian, General Manager of Bo Yi Chuang Exhibition, acted as the moderator. The meeting kicked off in a humorous host. Then Zhang Guolin, chairman of the wooden door and window professional committee, took the stage to deliver a speech for this meeting. Chairman Zhang first emphasized the importance of standards for the healthy development of the industry and briefly reviewed the establishment of the China Wood and Wood Products Circulation Association Wood Door and Window Professional Committee for 8 years. The efforts made in standard setting have raised the hope that each wooden door enterprise should strengthen communication and communication, and encourage all wooden door enterprises to be full of confidence, see the sun and see hope! Wang Yonglin, Secretary General of the Wood Door and Window Professional Committee, Wang Yonglin, Secretary General of the Wood Door and Window Professional Committee of the China Timber and Wood Products Circulation Association, took the stage to interpret the two industry standards. He said: China's wooden door industry is very young, just like a thriving Children, healthy, ran for 8 years. Now, the preparation of these two industry standards will further promote the standardization process of the wooden door industry. "Solid wood composite door" and "wooden enterprise enterprise classification standard" are the fourth and fifth industry standards. It is reported that the annual output value of the wooden door industry has exceeded 100 billion yuan, but there is no targeted, professional subdivision of national standards. . There are currently two national standards related to the wooden door industry. One is the standard for wood structure construction introduced in 1986, and the other is the Code for Quality Acceptance of Building Decoration Engineering, codenamed GB50210, which was implemented on March 1, 2002. Although both standards are related to the wooden door field, they are not targeted and professional, and the content is broad. Whenever there is a dispute between a consumer and a company, it is difficult to find the authoritative standard that can be relied upon. At this time, industry standards will come in handy. The reporter learned that the "Solid Wood Composite Door" and the "Classification Standard for Wooden Door Enterprises" are the fourth and fifth standards drafted by the National Committee of Wood and Wood Products Circulation. Prior to this, the China Wood and Wood Products Circulation Association Wood Door and Window Professional Committee drafted and compiled three wooden door industry standards - "wooden doors", "wood door installation specifications" and "wood door repair, replacement and return specifications." Among them, "Wooden Door" is the first product standard dedicated to the wooden door industry. It was officially released and implemented in 2006. The "wood door installation specification" and "wood door repair, replacement and return specifications" are the supporting standards for "wooden door". The installation and after-sales service of the wooden door products were separately regulated. The approval draft has been submitted to the Ministry of Commerce for publication and implementation. The standard of solid wood composite door is the first subdivision standard of wooden door industry. At present, the proportion of solid wood composite door in the market is increasing. The person in charge of the wooden door and window professional committee of China Wood and Wood Products Circulation Association said: "Solid wood composite door The introduction of the standard is to further improve and refine such products, and the standard binding force will be stronger. It can be said that this is the first subdivision standard of the wooden door industry. In addition, in view of the low threshold of the wooden door industry, the proposed “Classification of Wooden Door Enterprise Classification†will standardize the level of wooden door enterprises, and divide the wooden door enterprises at different levels to achieve the goal of enterprise planning and development and promote the wooden door. The technological progress of the enterprise and the adjustment of the industrial structure also provide an objective basis for future project investment bidding and other behaviors that need to evaluate the wooden door enterprises.
How are modern steel beam bridges constructed?
Modern beam bridges that can carry road traffic and railroad are made of steel or reinforced concrete which can also be prestressed or post-tensioned. First step in building of a Beam Bridge is placing of cofferdams which are constructed around each column location in the riverbed.
Why is steel used to construct bridges?
Steel is an ideal material for bridges. It is an essential part of modern bridges because it is strong, can flex without fracturing and has a long life, even in the harshest conditions. It can be used to build bridges of any length because of its durability and ease of manufacture and maintenance.
How long do steel bridges last?
Bridges are typically designed to provide 30 years of service. The actual length of service depends a lot on the amount of stress the bridge is subjected to.
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