Method for keeping roundness of pressure steel pipe in concrete backfilling process

A pressure steel pipe and pressure pipeline technology, which is applied to the field of maintaining the roundness of the pressure steel pipe in the process of concrete backfilling, can solve the problems of troublesome installation and disassembly, poor rounding effect, and reduced thickness, etc., and achieves simple and convenient operation and high use stability. , to ensure the effect of roundness
CN113172124AActive Publication Date: 2021-07-27华电云南发电有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
华电云南发电有限公司
Publication Date
2021-07-27

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Abstract

The invention discloses a method for keeping the roundness of a pressure steel pipe in a concrete backfilling process, and belongs to the technical field of pressure steel pipe construction. The method comprises the following steps: before concrete backfilling, a keeping device is put into the pressure steel pipe, keeping hydraulic cylinders on two sides are driven to synchronously contract by a PLC (Programmable Logic Controller) control system, and moving end plates on two sides are driven to approach by the keeping hydraulic cylinders, the movable end plates push a supporting plate to expand outwards through a diagonal draw bar, so that the supporting plate is in contact with the inner wall of the pressure pipeline; and the PLC control system control the keeping hydraulic cylinders to contract to drive the supporting plate to apply pressure to the inner wall of the pressure pipeline, the pressure borne by the outer wall of the pressure pipeline is balanced, the roundness of the pressure pipeline is guaranteed, deformation of the pressure pipeline is effectively avoided, and the pressure applying amplitude of the supporting plate to the pressure pipeline is controlled by sensing the change of the oil pressure of the inner cavity of a movable supporting hydraulic cylinder, the arrangement of a stroke sensor on the keeping device is reduced, so that the keeping device is simpler in structure and higher in use stability.
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Description

technical field

[0001] The invention relates to the technical field of penstock steel construction, in particular to a method for maintaining the roundness of penstock steel pipes during concrete backfilling. Background technique

[0002] Penstocks are used more and more in hydropower stations, especially the water delivery system of pumped storage power stations, which are often lined with penstocks in large quantities due to the influence of geological conditions. In the process of water conservancy construction, the pressure steel pipe is rolled by steel plate. During the transportation, the inner support and the outer reinforcement ring are used to reinforce it to prevent deformation; in the subsequent construction process of the pressure steel pipe outsourcing concrete pouring construction, the internal support is also required. Continuous support is used to prevent the deformation of the penstock during the outsourcing concrete pouring process; therefore, the internal ...

Claims

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