Split Collar Pipe Joint Structure Against Seismic Disengagement
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Solution Overview
Problem
The existing pipe mounting structure fails to effectively prevent disengagement of spigot and socket portions, leading to reduced sealing performance and fluid leakage due to bending and uneven forces, particularly during earthquakes or fluid pressure changes.
Innovation Solution
A disengagement prevention structure featuring a collar with a divided structure, including a first disengagement blocking part that blocks relative disengagement movement beyond a certain level and a second disengagement blocking part with increased falling-off resistance, along with a tilt restricting part to maintain the bent state of the spigot and pipe support portion within an appropriate range, thereby preventing fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spigot portion and socket portion are allowed to disengage completely, then the connection can be easily disconnected for maintenance or replacement, but the sealing performance deteriorates and fluid leakage occurs due to bending and uneven forces
Solution Approach 1:
The collar is designed with a divided structure that allows dynamic movement and rotation of the spigot portion relative to the socket portion. The connection maintains sealing through the collar's ability to accommodate movement while preserving the mechanical joint connection, rather than allowing complete disengagement.
2Reliability
If the collar structure is made more complex to prevent disengagement, then the sealing performance is maintained, but the device complexity increases
Solution Approach 1:
The collar is divided into multiple independent components including the collar body, disengagement blocking part, and tilt restricting part. Each component performs a specific function: the collar body provides structural support, the disengagement blocking part prevents complete separation, and the tilt restricting part controls angular movement. This segmentation allows the complex functionality to be achieved through modular, manageable components.
3Reliability
If the disengagement blocking part is positioned to effectively block disengagement, then the connection reliability is improved, but the bending between spigot portion and pipe support portion increases
Solution Approach 1:
The tilt restricting part is introduced to control the angular position of the spigot portion in a rotational dimension. By restricting tilt in this angular dimension, the spigot portion maintains proper alignment with the pipe support portion even when the disengagement blocking part prevents axial disengagement, thereby reducing bending deformation.
4Reliability
If the collar is made more rigid to maintain alignment, then the sealing performance is maintained, but the absorption capacity of disengagement forces decreases
Solution Approach 1:
The collar structure incorporates controlled flexibility through its divided design, allowing it to dynamically absorb disengagement forces from earthquakes or fluid pressure changes. The structure can deform within acceptable limits to dissipate energy, then return to its original position, maintaining sealing performance without requiring excessive rigidity.
Data Source
AI summary
A collar having a divided structure and surrounding a fitting connection part between a spigot portion and a socket portion in a sealed state is externally mounted over both pipe portions. A first disengagement blocking part that blocks, by contact, a relative disengagement movement beyond a certain level between the socket portion and the collar is provided at a location where the collar and the socket portion side face each other. A second disengagement blocking part provided with a retaining part in which falling-off resistance between the retaining part and an outer peripheral surface of the spigot portion increases according to a disengagement movement of the spigot portion is provided on a pipe support portion side on one end side in a pipe axis direction of the collar.