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[Keywords] valve; urban water supply; pipe network In 2015, Hangzhou's GDP exceeded 1 trillion yuan in one fell swoop, GDP growth rate reached 10.2%, higher than the national 2.2 percentage points. Among them, urban water supply can be described as "indispensable" in serving as an indispensable service. In this regard, the author analyzes the various drawbacks of valve management and maintenance in the water supply network, which can be used for reference by peers.
First, the status quo of valve operation 1 "sick valve" affects the normal opening and closing of the city water supply pipe network valve as a control facility, if the critical moment can not play the role of cutting, in an emergency situation will inevitably lead to increased water stop area, reasonable flushing Emissions or seriously affect the management and control tasks such as repair and water stop, water cut and cut. Among them, the accumulation of sludge in the valve well and the necrosis of the screw rod are more prominent. The biggest problem brought about by these "sickness valves" is that it is quite laborious to open and close. After closing, the water is not tight enough. Some even have missing signs, no squares, and the bonnet is buried.
Due to the development of urban construction and changes in the environment, some municipal road construction continues to expand, but in order to catch up with the construction period, relevant related units are not in place in key tasks such as pipeline connection, coordination and communication, so that a considerable part of the valve wells are buried. In the underground, it is difficult to find and difficult to use. Due to road reconstruction, some valve wells have been “naturally†moved to the middle of the road, which is more likely to cause the manhole cover to be crushed or even lost, which brings extremely unsafe hidden dangers to passing pedestrians and vehicles. Some valves have cross-flow of sewage in the well, and the environment is harsh; some do not use encryption devices, and the phenomenon of water shut-off occurs frequently.
2 Management and maintenance have to be kept up to the climate, geology and geomorphology of the southern city. The water supply valve has been in a dark and humid special environment for a long time. The depth of the well is shallow, resulting in poor durability of the valve stem seal packing and easy rust and water leakage. In the long run, if daily inspection and maintenance cannot keep up, it will inevitably lead to waste of water resources, increase the leakage rate of the pipeline network, and reduce the economic benefits of enterprises. According to the relevant requirements, the company conducts a comprehensive “physical inspection†and maintenance of the water supply valve every year. If it cannot be repaired, it must be replaced in time. However, for various reasons, valve maintenance needs to be improved and kept up.
3 Pipe network data deviation is not complete Some urban road water supply pipe network facilities have insufficient valve management information, lack of system construction drawings and design drawings, especially the size and model of the valve between road and road, street and street The distance is not clear, and the advanced modern management technology is lacking. Some installation valves do not follow the requirements of the diagonal twisting of the data, resulting in unevenness of the gasket and water seepage, but can not be found after the comparison; some due to the material moisture resistance, acid and alkali resistance, long-lasting Corrosive and affecting the use, but the information does not indicate this information; some due to the "figure" does not match or deviation from the actual data, it is managed by memory supplement. Others have even arbitrarily changed the use of network equipment and facilities, privately accessing the network and changing the configuration of the equipment. Once a valve is buried, it is difficult to find it accurately.
Second, due quality control First, solve the valve problem from the source. It is necessary to close the quality of the valve and select the appropriate type. It must be installed in strict accordance with the specifications, carefully constructed, and establish a sound valve patrol system in daily maintenance. The valve should be operated and maintained in strict accordance with the regulations. Regular inspection to ensure the valve The lubrication is good, the filler does not leak, and the valve is light and easy to open and close.
Secondly, it is necessary to comprehensively consider the installation environment, design requirements and pressure levels of the southern cities with humid climate and relatively heavy rain. When purchasing water supply valves, we must ensure good quality and never purchase three products. The valve specifications and standards must conform to relevant national technical standards.
Third, only the quality of the valve is guaranteed, and the safety can be guaranteed. The water supply valve is an important control device in the pipe network and is not operated frequently, but it must be ensured that it can be opened and closed at a critical time. In view of the defects in the quality of some valves, both parties should actively communicate with each other, listen to opinions, and strive for excellence in design and manufacturing to produce high-quality qualified products.
Fourth, with the development of modern process technology and material industry, valve performance should be continuously improved with the needs of urban water supply environment. For example, the driving device adopts a fully enclosed design, that is, all the operating parts and the intersection parts of the worm wheel housing that communicate with the outside are provided with sealing software, soaking in water, can be used normally, and the operation is flexible.
Fifth, we must put an end to the confusion caused by the valve closure and the lack of water. The surface of the valve body and the internal anti-corrosion are sprayed with non-toxic epoxy resin, and baked at high temperature. The anti-corrosion surface and the valve body material have strong adhesion, so as to completely solve the rust and rust inside the valve body and damage.
Third, due to the management of the urban water supply pipe network expansion, the increase of valves, complete and complete technical information, valve installation drawings, as well as replacement, maintenance, maintenance records, daily management cards and valve changes, etc. The traditional manual management or memory mode can no longer meet the requirements. It is necessary to use scientific and technological means to establish a valve operation and maintenance account, update the computer management, and make valve data updates and data reserves.
First, do a good job in the management of the operation. The valve position setting should meet the scheduling requirements of the urban water supply, and it is in line with the segmentation and zoning control of the water supply pipeline and the need for maintenance. The connection between the main pipe and the main pipe shall be provided with a valve; the connection between the branch pipe and the main pipe shall be provided with a valve on the branch pipe; the branch pipe between the water distribution main pipe shall not exceed 3, and the spacing shall not exceed the arrangement length of 5 fire hydrants; long distance transmission The distance between the water pipeline valves should not exceed 2 kilometers.
Second, meet the technical standards. After receiving the single acceptance notice from the engineering construction department, the receiving enterprise shall complete the single acceptance work within 7 working days, but at the same time meet the requirements of the eight technical standards: (1) the setting of the valve and valve well fully meets the design requirements; (2) Issue the manual and conform to the situation of the on-site valve; (3) Have the factory certificate of conformity; (4) The opening and closing operation end of the valve can be flexibly opened and closed, and there is no stuck phenomenon in each transmission part, no abnormal sound (5) When the butterfly valve is opened and closed, the pointer indication is consistent with the actual opening and closing situation; (6) the valve well masonry meets the requirements of national standards; (7) there should be no foreign matter or water in the valve well; (8) signboard installation Meet the requirements of the recipient, the facility registration form is complete.
Third, information is entered into the GIS system. After the new pipeline project is put into operation, the enterprise should timely incorporate the valve into the daily management model and input relevant information into the GIS system, and do the valve card construction work. During the warranty period, when the valve and valve facilities fail, the fault emergency treatment should be done, and the project construction unit should be notified to find out the cause of the fault. The relevant expenses incurred due to the failure of the construction quality shall be borne by the construction unit. The loss and cost caused by the quality of the material shall be borne by the supplier of the material supply department.
Fourth, implement a dynamic inspection mechanism. The grassroots departments shall establish rules for dynamic inspection of valves and implement dynamic inspection plan management. The annual and monthly plans for dynamic inspection of valves shall be prepared and reported to the senior management department of the enterprise in a timely manner. The management department shall review the annual and monthly dynamic inspection plans of the valves reported at the grassroots level, and supervise and inspect the implementation of the valve dynamic inspection plan. Fifth, the dynamic inspection of the valve should be implemented to people and units. To check the account record, log the inspection result to the valve card. In the case of dynamic inspection or other valve operation, problems affecting water supply safety and personal safety shall be taken immediately, and effective measures shall be taken immediately to prevent the occurrence of safety accidents. Eliminate the burial and settlement of valve wells in “online disease valvesâ€. If the valve cannot be repaired, the valve can be replaced. The replaced valve should be handled uniformly by the unit. The spare parts that can be recycled should be retained and used.
Sixth, establish and improve the valve water stop operation system. Ensure that the valve water stop operation is carried out in an orderly manner. It is strictly forbidden to open and close the valve for water stop operation. When performing dynamic inspection, water stop operation, maintenance, etc. on valves and valve well facilities, safety precautions should be taken to ensure necessary safety warnings. When entering the valve well chamber, safety inspection and forced ventilation measures should be taken. It is strictly forbidden to enter the well chamber for operation before taking safety measures.
Fourth, establish the "levels" that should be
First, put a good assessment and assessment. From the maintenance indicators, we must do a good job of the valve "five rates", that is, the card-building rate, dynamic inspection plan completion rate, facility integrity rate, GIS system input rate, card-building rate of not less than 98%, DN300 (including) up to 100 %. At the same time, establish a work assessment system for valve management personnel, and carry out annual and monthly work evaluation.
The evaluation indicators should be further refined and quantified based on the work objectives, combined with the valve construction rate, dynamic inspection plan completion rate, valve facility integrity rate, and effective valve opening and closing rate. The senior management department of the enterprise shall evaluate the implementation of relevant indicators or make appropriate adjustments to the evaluation indicators.
Second, good maintenance. The daily maintenance of the water supply valve must be periodically checked weekly. Different weekly inspection dates are determined according to the size of the valve. Unscheduled patrol inspections are carried out on all streets. Once a valve cover is lost, it should be repaired immediately to avoid a safety accident. At the same time, encryption prevention, and gradually promote the installation of encryption valves, to prevent chaos, and to install encrypted manhole covers to prevent theft.
Third, put a good construction off. Valve installation and valve well masonry shall be constructed in strict accordance with the drawings, and the dimensions shall conform to the design requirements. In order to facilitate the maintenance of all valves in the future, expansion joints should be installed. At the same time, in the construction of the pipe network should be rationally laid out, comprehensive consideration, valve installation should be appropriate, to facilitate and reasonable, easy to find and effective maintenance at any time in the future.
Fourth, put a good security. It is necessary to firmly understand the safety of this book, which is the life of the enterprise development. Due to the dark and humid inside of the valve well, the exhaust gas is easily stored in such a sealed space, and it is easy to form an oxygen deficiency. Therefore, maintenance personnel must be ventilated and ventilated before entering the valve well to avoid accidents. Safety warning signs should be set up when working in the valve well in the middle of the road, or a special person should be on duty.
Fifth, close the good information. The complete preservation of water supply facilities such as valves and pipe network data is a very important task. The technical data of the valve mainly includes the valve manufacturer's manual, quality certificate, sanitation license, valve opening record, maintenance record, change record, installation position, etc. In general, the more detailed the better. According to the service extension of the water supply network and the increasing number of valves, consider the application of scientific and technological means, do a good job in the management of the basic data of the valve, and actively use the electronic information system (GIS) of the electronic file network to input the relevant information of the valve in time. The water supply network geographic information system makes the online valve consistent with the card, the physical object and the figure, laying a solid foundation for the long-term tracking of the valve and the reasonable arrangement of the valve maintenance.
Brief Discussion on the Management and Maintenance of Water Supply Pipe Network Valves
ã€Abstract】With the development of urban construction and the change of environment, in view of the quality of the water supply pipe network of Hangzhou Water City, the new situation and new problems arising from the management and maintenance, it is proposed how to make the management in place and the maintenance needs. And other issues. As a company, we should strive for survival with quality and credibility, and seek development with the market, putting high-quality water supply and safety benefits first.