Water supply network planning, setting is the initial stage of the PVC pipeline design, the layout is reasonable or not directly related to the operation of the water supply is reasonable or not and the pump head settings. When the focus of development of the city, investment direction, urban planning, or the water supply scale change, designed according to the conventional method of pipe network, due to the inability to solve optimization and contradiction on the adaptability of change condition, design, management and construction departments often in a passive position in "repair", which appeared in the road for many times "disembowelling her, the main problems existing in the network planning and layout in, causing extensive damage and artificial and resource waste. The root cause of this phenomenon is that designers from the beginning and ending end of consciousness exists on network system "patchy" is inherent in the design ideas, no from macro and methods to be extended.
We all know that the high-speed inner ring or outer ring road, can greatly improve the traffic capacity of a city, its investment / benefit ratio is quite high. High speed link has been able to improve transport capacity, the main reason is to improve the speed. Based on this idea, we put forward the design of water supply pipe network theory, reflected to the network planning and fixed line, can be considered from the following aspects:
1) for small and medium cities, a vertical can layout double trunk line or form a "link", if it is a main line, try to make the trunk to the left and right approximate distance on both sides of the edge of; if is within the link, the link to the outer edge of the distance and to the ring in the heart of the distance similar. For large cities, can consider the establishment of a double ring line or the word line.
2) in the link to link only dry PVC pipe connected, not connected with the branch pipe, so that the hydraulic can reduce the influence of local head loss, in the technology can avoid the pipeline of big diameter and the small diameter pipeline connections, saving investment. In the ring in the reason to avoid local head loss. The reason is that, link of larger diameter, velocity, in accordance with the hf= zeta V2/2g, zeta = (0.1 ~ 1.5) + (0.03 ~ 0.49) [3], if you take the zeta = 1.0, v=2.0, is hf=0.2, also is said, each received a tube, there is 0.2 M head loss, so on the downstream effects of larger.
3) flow from the link down after, through the branch pipe connected to the user, then can enable these laterals are reduced as much as possible, the minimum pressure requirements can be met. The reason is that the rapid growth of the urban water supply mainly from on an urban scale expanding and development of new industries and enterprises, and in the urban area, due to the relative stability in the distribution of population and industry, with the change of water relatively small.
By the theory of highway of characteristics of pipe network layout, a wider range of application in construction link, as far as possible to consider the long-term with the increase of water demand, so as to meet the requirements of long-term water supply without consideration should be given to the direction of the long term water supply, so as to avoid big changes due to the change of the center of gravity of the water supply pipe network, so the network. It is proved by example that the pipeline network designed by the freeway theory is similar to that of the investment in the same way by using the conventional method and the optimization of the pipe network.
2, to optimize the calculation of water pipe network
The so-called working optimization calculation is in the optimization process, taking into account the biggest water, accident, fire, the maximum transfer various possible water supply condition, make the design of pipe network system and meet the requirements of various conditions of water supply.
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