Haidian Sewage Pumping Station is located in the beautiful Haichang Haidian Creek, Haikou City sewage treatment project is an important ancillary works, responsible for the transport center area (except Haidian Island, Xinbu Island) all the sewage task. The total project cost is 42,959,200 yuan, covers an area of ​​about 4500m2, designed to enhance the sewage capacity of 6.0m3 / s. Since it was put into operation in October 1999, it has delivered an average of 20 × 104m3 / d of sewage. 1 process and problems 1.1 between the grid grille between the plane size of 8.0m × 18.0m, the ground below the depth of 9.3m, the operating platform is located 4.9m below the ground, is a semi-subterranean grille. There are three sets of gutters, using underground parallel straight reinforced concrete channels, length of 8.0m, width of 3.0m. The main equipment and equipment in Table 1. Arranged between the grille 6 ultrasonic level meter, used to display the gate before and after the water level. Grille between the water flow is good, the equipment selection economical and reasonable, advanced technology. However, some problems have been found in the actual operation: ①There is a big gap between the elevation of water level at the inlet culvert (the water level at the inlet of the floodgate) and the operating platform, resulting in serious potential safety hazards in production. For example, a sudden power outage Or floodgate leakage damage and other circumstances, the rapid flow of sewage will be in a very short period of time will be flooded the entire platform, resulting in irreparable loss; ② grille too wide (60mm) so that some water in the soft material (such as Cloth strips, hemp rope, etc.) can easily be washed across the grid into the pump pit and wound on the impeller running at high speed, affecting the normal operation of the submersible pump; grid motor due to rake together with the rake, it is easily damp corrosion .
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