Nuclear Plant Concrete Lining Method Using Backing Strip
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Solution Overview
Problem
The existing lining method for concrete walls in nuclear power generation plants involves a conflict between the placement of concrete and the lining process, leading to poor workability and longer work periods.
Innovation Solution
A lining method where a backing strip is fixed to the concrete surface after it has been placed, and a filler is used to fill the gap between the lining plates and the concrete, allowing the lining plates to be butt-joined and sealed after the concrete has set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backing strip is disposed before concrete placement and welding is performed after concrete placement, then the lining structure can be properly formed, but the co-existence of concrete placement and lining operations causes operational conflict and extends the work period
Solution Approach 1:
The backing strip is disposed and the liner plate is temporarily fixed to it before concrete placement, performing the preliminary lining preparation in advance. This allows the concrete placement to proceed without interruption while the lining components are already in position, eliminating operational conflict and reducing the overall work period.
2Manufacturing precision
If the backing strip is disposed before concrete placement, then the lining plates can be positioned correctly, but the operational conflict with concrete placement reduces workability
Solution Approach 1:
The backing strip and liner plate are prepared and positioned in advance before concrete placement, ensuring correct lining plate positioning is established beforehand. This preliminary preparation maintains manufacturing precision while allowing concrete placement to proceed independently, thereby improving overall workability.
Solution Approach 2:
The lining process is segmented into separate preparatory steps (backing strip disposal and liner plate fixation) that can be completed independently before concrete placement. This segmentation allows different operations to be performed by different teams without interference, improving workability while maintaining positioning precision.
3Reliability
If seal welding is performed after concrete placement, then the lining plates can be properly joined, but the work period is extended due to sequential operations
Solution Approach 1:
The liner plate is temporarily fixed to the backing strip before concrete placement, performing the positioning and preliminary joining operations in advance. This allows seal welding to be conducted on already-positioned plates after concrete curing, ensuring welding quality while reducing the total project duration by eliminating sequential delays.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method eliminates the conflict between concrete placement and lining, enhancing workability and reducing the work period, while also improving quality and reducing manufacturing costs.
Implementation Method 1
a backing strip (1) fixed to a concrete surface (100a) of already-placed concrete (100) in a state of protruding from the concrete surface (100a)
Implementation Method 2
a filler (2) disposed inside a frame of the backing strip (1)
Implementation Method 3
edges of a plurality of lining plates (3) are made to butt against each other at a position of the backing strip (1), and the edges of the lining plates (3) are joined by seal welding (5)
Data Source
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AI summary
A lining method achieves enhanced workability and makes a construction period shorter. The lining method includes the steps of: fixing a backing strip (1) in a frame shape to a concrete surface (100a) of already-placed concrete (100); and making edges of a plurality of lining plates (3) covering the backing strip (1) and the concrete surface (100a) butt against each other at a position of the backing strip (1), and joining the edges of the lining plates (3) by seal welding (5).