Pipe Joint Watertightness Testing With Reaction-Force Restraint
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Solution Overview
Problem
Conventional watertightness testing methods risk detachment of the second pipe from the first pipe due to water pressure during the test, leading to potential leaks and testing failures.
Innovation Solution
A watertightness testing method and device that uses a pulling device and strap-shaped member to secure the second pipe to the first pipe, preventing detachment by maintaining a reaction force in the joining direction, while allowing the testing device body to move within the pipe for thorough testing without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If water pressure is applied inside the annular sealed space to perform watertightness testing, then the testing accuracy is improved, but the second pipe may become detached from the first pipe
Solution Approach 1:
The patent applies preliminary anti-action by pre-installing a restraining structure (clamping mechanism with夹紧 plates) on the second pipe before performing the watertightness test. This restraining structure counteracts the detaching force generated by water pressure inside the annular sealed space, preventing the second pipe from detaching while allowing accurate testing to proceed.
2Reliability
If the second pipe is restrained during watertightness testing to prevent detachment, then the pipe connection stability is improved, but the device complexity increases due to additional restraining mechanisms
Solution Approach 1:
The patent merges the restraining function with the existing testing device by integrating the clamping mechanism into the overall testing system. The restraining structure is combined with the water stop bags and testing device body, allowing the system to simultaneously perform both restraint and watertightness testing functions without requiring completely separate independent systems.
Solution Approach 2:
The restraining structure is designed to be self-regulating through friction between the clamping plates and the second pipe. The friction force naturally adjusts to counteract the water pressure, eliminating the need for complex active control systems or additional actuators to maintain the restraining force during testing.
3Reliability
If a restraining structure is added to prevent pipe detachment, then the pipe connection stability is improved, but the ease of operation deteriorates due to additional setup steps
Solution Approach 1:
The restraining structure is designed for preliminary installation on the second pipe before the watertightness testing begins. The clamping plates and restraining components are pre-positioned and secured to the second pipe, so that during the actual testing operation, no additional adjustment or setup is required - the restraint is already in place and functional.
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
Ensures the second pipe remains securely attached to the first pipe during the watertightness test, preventing detachment and ensuring accurate results by restraining the second pipe through the assembling device and pulling device in the pipe axial direction.
Implementation Method 1
operating the pulling device and pulling the strap-shaped member in a separating direction of the second pipe to have a reaction force generated in the second pipe cause the second pipe to be pulled in a joining direction
Implementation Method 2
a cylindrical member 207 and a pair of annular water stop bags 208 which are provided in the cylindrical member 207 and of which a diameter-expanding operation can be performed
Implementation Method 3
The testing device body 205 inspects water leakage from an elastic seal 211 of the joined section 204 by supplying water 210 for a water pressure test to inside of the sealed space 209 and applying water pressure
Data Source
AI summary
A watertightness testing method for testing watertightness of a joined section (4) where one end section of a second pipe (3) is joined to a first pipe (2), the watertightness testing method including: inserting a testing device body (21) into the first pipe (2); attaching an assembling device (80) to another end section of the second pipe (3); attaching a pulling device (82a) to the assembling device (80) and connecting the pulling device (82a) to a strap-shaped member (112a) having been wound in advance around an outer circumference of the first pipe (2); operating the pulling device (82a) and pulling the strap-shaped member (112a) in a separating direction of the second pipe (3) to have a reaction force generated in the second pipe (3) cause the second pipe (3) to be pulled in a joining direction (G), the one end section of the second pipe (3) to be inserted into the first pipe (2), and the second pipe (3) to be joined to the first pipe (2); and operating a moving operation rod (22) provided in the testing device body (21) from outside of the other end section of the second pipe (3) in a state where the second pipe (3) is being pulled in the joining direction (G) to move the testing device body (21) to the joined section (4).