Abstract: The application of U-PVC pipe in water supply pipe is introduced. Combined with construction practice, some experiences of application of U-PVC pipe are introduced. Keywords: water supply pipe U-PVC pipe I. INTRODUCTION With the development of urban construction, the improvement of people's living standards has put forward higher requirements on the quality of drinking water. At the same time, in order to ensure the water quality of the water supply network, the State Ministry of Construction, Ministry of Chemical Industry, China National Light Industry Council, State Building Materials Bureau, China Petrochemical Corporation jointly issued a document and Shaanxi Provincial Department of Construction, Shaanxi Provincial Bureau of Quality and Technical Supervision, Shaanxi Provincial Administration for Industry and Commerce Bureau jointly issued by the Shaanxi Provincial People's Government [2001] No. 247 water supply pipe is strictly prohibited galvanized steel pipe, gray cast iron pipe provisions eliminated. Division I through the investigation and analysis of water quality, combined with the actual situation of the pipe network, gray cast iron, especially galvanized steel pipe is one of the main water quality and quality of water, at the same time due to gray cast iron, galvanized steel pipe wall scaling Water capacity decreases, increasing water resistance, a serious threat to water safety and reliability. Second, the promotion and application of U-PVC pipe Currently on the market for a wide range of plastic pipes for water supply, all kinds of plastic pipes have their own advantages and disadvantages, therefore, must be combined with the actual selection of suitable plastic pipe. To this end, our company set up a new type of pipe selection leading group of specialized agencies, after research and repeated demonstration, the development of the selection of the basic principles of new pipe: 1, complete technical regulations, product standards and design, construction and acceptance of a full range of norms; 3, easy to construct, easy to operate, no special tools, fast and reliable; 4, easy to take the branch pipe, not enough water to open the tee branch pipe 5, easy maintenance, repair methods are simple, complete repair fittings ; 6, the pipe is not subject to corrosion of sewage, industrial waste water and various harmful gases; combined with the above several basic principles, conscientiously analyzed the products of many manufacturers on the market, and with reference to other successes and problems in use According to the actual situation of the enterprise, U-PVC pipe is determined to be an alternative product of gray cast pipe and galvanized pipe. U-PVC pipe has the advantages of light weight, no rust, no scale, smooth inner wall and superior hydraulic conditions, Pipeline secondary pollution, and U-PVC pipe compared to other plastic pipe, technology is mature, pipe, pipe fittings complete specifications, In maintenance, and we have successfully used practice, our company is determined to promote the use of U-PVC pipe, and issued a "notice to stop using galvanized pipe and gray cast iron pipe in water supply pipeline process, promote the use of new pipe." Taking into account the current production of many U-PVC pipe manufacturers, pipe fittings GM is not very good. Division I determine the three manufacturers of products as a trial of pipe. In addition, with a variety of U-PVC connection, the actual working practices of construction workers, clear DN200, DN100 U-PVC pipe connector selection rubber ring connection. DN50, DN25 use U-PVC pipe joints live joints and joints inserted plastic adhesive. Third, the application of a few experience U-PVC pipe as a buried water supply pipe, the application in the country for several years, compared to the Division I use later, after a period of use, is now put forward some of the applications Experience: 1, trench excavation and backfill. Compared with ductile iron pipe and steel pipe, U-PVC pipe is light weight, easy to install, less labor, less demanding on construction equipment. It is based on the above characteristics, construction, the construction unit to save costs, trench excavation width sometimes fail to meet regulatory requirements, such as sometimes DN200 trench width of 0.6-0.7M. Although not affect the pipeline installation, but the backfill quality is difficult to guarantee, the soil compaction can not be guaranteed. Especially with the construction of road construction at the same time, generally more for the road repair unit after the lime soil, pipe trench excavation, the general pipeline depth of about 1.7M design, the actual need to dig about 1M, the trench Narrow and shallow, difficult to meet the requirements of backfill, pavement in real time, it will threaten the safety of the pipeline will also affect the quality of road works. In addition, the ditch bottom should ensure that the thickness of not less than 100MM sand cushion, especially in the old city, ditches more construction waste, we must strictly enforce the norms to ensure the quality of backfill so that the pipeline can run safely. 2, pipe installation U-PVC pipe than the metal pipe is less important. The installation requires less manpower and lower installation cost. The connection mode adopts the rubber ring interface, which greatly improves the installation efficiency. The larger the diameter is, the more obvious the superiority is. The only downside is that the pipeline port no jacking depth mark line, inconvenient to grasp the jacking depth when installing, especially at night installation. Its impact is even greater. In addition, pipe often need to cut the pipe installation. Notched face must be serious, especially when crossing over other underground facilities, due to U-PVC elbow mostly double socket, different from the straight line installation. If the groove is not in place, it is difficult to install, but also easy to top the apron or dislocation of the apron, such as in a pipeline project, the pipeline need to cross the power ditch, due to pipe cutting end bevel not in place, uneven Nearly two hours also can not advance, after re-groove, successfully installed successfully. 3, the pipeline pressure test pipeline pressure test, hydrostatic pressure hydrostatic pressure test specifications must not be designed within the water pressure, and shall not be less than 0.8Mpa. Division I follow the metal pipe test standards, the test pressure of 1. OMPa, the regulator 0.5h, U-PVC pipe axial expansion coefficient larger than the metal pipe, our standard pressure test more standardized, the pressure test interface generally prolapse 2-5MM, so the pressure test backfill must be achieved Required compaction, pipe pier to achieve the design strength, back safe and stable, at the same time, observe the pressure when the interface to ensure smooth pressure test to ensure project quality. 4, the pipe pier as a water supply pipe, U-PVC pipe has been used for some time, but the relevant standards are not complete, such as the pipe pier practice, metal tube village pier has a relatively complete standard atlas, construction workers on The practice of metal pipe is familiar with, in practice, construction workers often by metal pipe pier practice masonry U-PVC tube village pier, and U-PVC pipe and metal pipe material characteristics are very different, should be different analysis, specification Clearly stipulates that "U-PVC pipe shall not be used 360 °" full of concrete for foundation treatment or to enhance pipe carrying capacity. "To avoid pipelines due to local stress concentration and damage to the pipeline, affecting the safe operation of the pipeline, therefore, I Division with the specification and regional soil Characteristics of the pier masonry has been standardized, the development of construction standards, standardize construction, to ensure project quality. 5, the user pipe installation User pipe installation, due to U-PVC material meter wells without the appropriate installation standards, most of the installation Reference to the implementation of existing national standards of metal pipe Atlas due to U-PVC and metal pipe of different materials, prone to some problems: 5.1 meter wells Pipe fittings are more, especially in the bypass table, the construction of pipe diameter DN> 100 pipe fittings are generally apron connection and flange connection using the apron interface, because the vertical and horizontal are with the table wall A certain distance, the water test, sometimes have the phenomenon of pipe fittings off (Xi'an water supply network average pressure of 0.24MPa or so), but the flange connection does not appear this kind of phenomenon, combined with the construction practice, water meter pipe connection flange connection 5.2 Rubber tube prices are higher than those of other metal pipe fittings. For example, the main pipe of DN-200 and bypass pipe diameter DN100 is installed and installed. The main tree cost of U-PVC pipe fittings is higher than that of nodular graphite Pipe fittings more than 2 times, affecting the enthusiasm of the construction unit application, thus reducing the price of the pipe fittings, U-PVC pipe can be better to promote. 5.3 The existing water meter and standard Atlas installation, In the vacant state, the gate, the water meter at the masonry pier, tee, elbow at whether to build the pier, the current U-PVC pipe water meter and has not yet clearly defined requirements. In actual operation, sometimes under and dimensional Maintenance inspection, not masonry piers will affect the pipeline maintenance and installation. Raw water meter and standard atlas based on the characteristics of metal materials developed, and U-PVC pipe and metal pipe are very different, should be combined with U-PVC material characteristics, make the corresponding Modify, in the water meter and by the tee, elbow brick pier or reinforcement measures taken to ensure the safe operation of the pipeline is an effective measure.Combined with the practice of construction, to promote the use of good U-PVC pipe, according to national standards , Norms, combined with the characteristics of enterprises to develop enterprise design rules, construction standards, acceptance criteria. At the same time do a good job of training, to promote the U-PVC pipe. IV Conclusion U-PVC pipe as the city's new water supply pipe, with its The superiority has been widely used in water supply projects. It also needs to be constantly summarized in production practice to further improve and perfect the technical specifications and related standards so as to make greater contribution to the application and popularization of U-PVC water supply pipes. The above is the author in the construction practice for the Association, deficiencies, hope colleagues correct. (Xi'an City Water Company Kong Fan Tao Guo Xin Chao)
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