Benchmark Marking Tool Segmentation for Nuclear Water Tightness

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Solution Overview

Problem

Conventional benchmark marking tools in construction are not suitable for buildings requiring high water tightness, as they can damage the structure's integrity and create gaps that compromise water tightness, especially in facilities like nuclear power plants, and are difficult to remove without causing obstruction or damage.

Innovation Solution

A benchmark marking tool with a stainless steel marking plate, a carbon steel stud, and an outer peripheral flange that is buried in the structure's coating layer to maintain the benchmark's position without compromising water tightness, featuring a countersunk screw design that seals gaps and prevents structural damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the benchmark marking tool is rigidly fixed to the structure through nailing or screwing, then the benchmark can be maintained at a set position over the construction period, but the structure may crack and gaps are formed that damage water tightness

Engineering Contradiction:

Improvebenchmark position stabilityVSAvoidwater tightness

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The benchmark marking tool is divided into separate components: a marking plate for positioning, a stud for anchoring, and an outer peripheral flange for sealing. This segmentation allows each component to perform its specific function - the stud provides rigid fixation while the flange creates a seal with the coating layer, preventing water penetration without requiring the marking plate to be directly nailed or screwed to the structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The outer peripheral flange acts as an intermediary element between the stud (fixation component) and the coating layer (sealing component). The flange is buried in the coating layer to form a sealed interface, mediating between the rigid fixation requirement and the water tightness requirement, thereby preventing gaps that would compromise sealing while maintaining benchmark stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If the benchmark marking tool is fixed rigidly to maintain position over long construction periods, then the benchmark remains stable, but a larger workload is imposed by the removing operation and it becomes an obstruction

Engineering Contradiction:

Improvebenchmark position stabilityVSAvoidremoval operation ease

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The marking plate is designed to be removable from the structure after the construction period. The stud remains embedded in the structure to maintain the benchmark position during construction, while the marking plate can be detached when no longer needed. This extraction of the marking function from the fixation function allows the benchmark to remain stable during construction while eliminating removal workload afterward.

Inventive Principle:

Principle #2Taking out (Extraction)

3Stability of the object's composition

If nailing or screwing is used to fix the benchmark marking tool, then the benchmark can be maintained at a set position, but the structure may crack and gaps are formed between the base material and the tool

Engineering Contradiction:

Improvebenchmark position stabilityVSAvoidstructural damage and gaps

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The outer peripheral flange works with the coating layer to create a flexible seal that adapts to the structure surface. Rather than rigidly fastening through the coating layer (which causes cracks), the flange is buried in the coating layer to form a sealed interface that maintains water tightness while allowing the structure to move slightly without cracking.

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS8887449B2Benchmark marking tool and benchmark marking method

Publication Date: 2014.11.18 TOSHIBA PLANT SYSTEMS & SERVICES

AI summary

A benchmark marking tool includes a marking plate having an upper surface formed in a flat shape so as to mark a benchmark on the upper surface, a stud extending from a back surface of the upper surface of the marking plate and buried in a structure such as a floor of a building to fix the marking plate, and an outer peripheral flange provided around the marking plate and buried in a coating layer applied to the structure. The marking plate is provided such that the upper surface is located to be flush with or below an upper surface of the coating layer formed on the structure when the marking plate is located in the structure of the building.