Non-stop water-carrying installation method for Parshall metering tank of sewage treatment plant and positioning tool

By combining a portal rigid frame and total station closed-loop fine adjustment with multi-layer sealing technology, the problem of millimeter-level precise positioning and reliable sealing of the Parshall metering tank in the sewage treatment plant under non-stop operation conditions was solved, achieving high-precision installation and underwater stability of the tank.

CN122306185APending Publication Date: 2026-06-30赵有刚
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Patent Information

Application Number
CN202610635643.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-09
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In wastewater treatment plants, existing technologies struggle to install and reliably seal Parshall flumes with millimeter-level precision without interrupting production or discharging water, especially under conditions of strong water flow, where traditional methods are insufficient to achieve rigid constraints and fine-tuning of the flume.

Method used

The trough is suspended by a portal rigid frame and combined with total station closed-loop fine adjustment and multi-layer sealing technology. The trough is positioned with millimeter precision and reliably sealed underwater through six sets of three-dimensional adjusting screw assemblies, including quick-setting sealing material, water-swellable water-stop strips and layered grouting.

Benefits of technology

It achieves installation accuracy of ≤2mm throat width deviation and ≤2mm weir crest elevation deviation in water flow with a velocity of 1.8m/s, ensuring the normal operation of the sewage treatment plant, avoiding the risk of shutdown and biochemical system collapse, and providing a reliable underwater seal.

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Abstract

The invention discloses a non-stop water-carrying installation method for a Parshall metering tank of a sewage treatment plant and a positioning tool, and belongs to the field of sewage treatment equipment installation construction. According to the method, the problems that the water flow impact force is large, underwater millimeter-level positioning is difficult and sealing fails when an old groove is replaced under the working condition that a large-flow open channel is not stopped are solved. The method comprises the following steps: prefabricating a rigid positioning frame, and installing an adjustable three-dimensional screw on a cross beam; the tank body is hung into water, a tail end connector of a vertical screw is connected with a lifting lug pin shaft at the top of the tank body, and the tank body is hung by a frame to complete rough in-position; a total station is erected to collect three-dimensional coordinates of feature points of the tank body in real time, and three-axis fine adjustment is driven in a measurement and deviation feedback mode until center lines coincide, the throat width deviation is smaller than or equal to 2 mm, and the weir crest elevation deviation is smaller than or equal to 2 mm; and finally, layered composite sealing is conducted, a steel wire mesh and waterproof material mixed plugging is conducted on a front edge seam of the bottom plate, expansion water stop strips are plugged in vertical seams on the two sides, and C40 grouting materials are poured twice. The installation precision and sealing of the method are qualified through detection, economy is achieved, and environmental protection risks are avoided.
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