Top-Down Penstock Segment Installation for Rockfall Protection
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Solution Overview
Problem
Traditional methods for installing large-diameter pipelines, such as penstocks in hydropower plants, pose risks due to rockfall when installing from the bottom up, as workers are exposed to falling rocks during the process, and consolidating the conduit wall is expensive and time-consuming.
Innovation Solution
A method involving securing the first pipe segment at the top end of the conduit, aligning and lifting subsequent segments using a lifting mechanism with retractable wheels and a winch, and attaching them to the lower rim of the previously installed segment, allowing workers to be protected within the installed pipe segment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pipe segments are installed from bottom end toward top end of conduit, then installation can proceed systematically with each segment attached to previous one, but workers are exposed to rockfall danger from detached rocks within previously installed segments
Solution Approach 1:
The patent inverts the traditional installation sequence by installing pipe segments from the top end of the conduit downward instead of from bottom upward. This reversal allows workers to remain outside the conduit during installation, eliminating their exposure to rockfall hazards from detached rocks within previously installed segments while maintaining systematic installation progression.
Solution Approach 2:
The patent employs preliminary action by first consolidating the inner wall of the conduit before installing pipe segments. This pre-consolidation creates a protective barrier that prevents rock detachment and rockfall during the installation process, thereby protecting workers from harmful factors while enabling safe and efficient installation operations.
2Reliability
If inner wall of conduit is consolidated before pipeline installation, then rockfall risk is reduced, but installation process becomes more expensive and time-consuming
Solution Approach 1:
The patent inverts the installation sequence to install from top downward, which fundamentally changes the risk profile. This inversion makes preliminary consolidation unnecessary because workers operate from outside the conduit, eliminating rockfall exposure without requiring time-consuming consolidation work, thereby resolving the contradiction between safety and installation time.
3Ease of manufacture
If pipe segments are installed from bottom end upward, then each segment can be attached to the top rim of previously installed segment, but serious risks are created for workers and equipment due to rockfall
Solution Approach 1:
The patent inverts the installation direction from bottom-up to top-down, which fundamentally resolves the contradiction. By installing from top downward, workers remain outside the conduit throughout the process, eliminating their exposure to rockfall hazards while maintaining the ability to systematically attach each segment to the previous one through the inverted sequence.
Data Source
AI summary
A method for installing pipeline segments within a conduit. The method includes a step of securing a first pipe segment of the pipeline segments at a top end of the conduit, a step of aligning a main axis of a second pipe segment of the pipeline segments with the main axis of the pipeline, a step of lifting the second pipe segment from a first position associated with a bottom end of the conduit to a second position adjacent to the first pipe segment, a step of abutting a top rim of the second pipe segment against a bottom rim of the first pipe segment, and a step of attaching the top rim of the second pipe segment to the bottom rim of the first pipe segment.