Dynamic reducing cutting device for pipeline repair and construction method

By using a dynamic variable diameter cutting device, which utilizes a drive gear, bevel gear, and double-sided toothed ring transmission system, combined with a multi-stage telescopic rod and grouting system, the problem of incomplete or excessive cutting in pipeline repair in existing technologies has been solved. This enables precise repair of severely uneven and collapsed pipelines, ensuring the stability of the new pipeline and the surrounding retaining wall.

CN121945865APending Publication Date: 2026-05-01CCCC SHANGHAI DREDGING CO LTD
2 Cites 0 Cited by

Patent Information

Application Number
CN202610307028.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-13
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing variable diameter drill bit technology cannot effectively cope with irregular defects such as severe undulations and collapses in pipeline repair, resulting in incomplete cutting or over-cutting.

Method used

A dynamic variable diameter cutting device was designed. The cutting parameters are dynamically adjusted through a drive gear, bevel gear and double-sided toothed ring transmission system. Combined with a multi-stage telescopic rod and grouting system, the cutting head is ensured to make precise contact with the pipe-soil mixture. The new pipe is tightly locked with the grout wall through a replacement structure and a lifting structure.

Benefits of technology

It enables precise cutting of pipelines with severe undulations and collapses, avoids stuck drills or excessive cutting, improves system adaptability and repair efficiency, and ensures the stability of the new pipeline and the surrounding protective wall as well as the overall stability.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

A dynamic variable-diameter cutting device for pipeline repair belongs to the technical field of pipeline repair and comprises a machine head and a variable-diameter structure arranged in the machine head and used for cutting a pipeline, and the variable-diameter structure comprises a rotating component and a variable-diameter component; therefore, the diameter of a circle formed by the four sets of second cutterheads is smoothly increased, it is ensured that the first cutterheads and the second cutterheads make contact with a to-be-cut pipeline-soil body mixture all the time, drill jamming or excessive cutting of undisturbed soil is avoided, meanwhile, through protection of a protective cover, a double-face tooth ring and a second motor are covered inside, and the working efficiency is improved. On this basis, dynamic adjustment of cutting parameters is achieved through the structure, irregular defects such as serious fluctuation and collapse of a pipeline can be precisely treated, precision adjustment is ensured through a driving gear, a first bevel gear and a double-face tooth ring transmission system, the adaptability is improved compared with a pipe cracking method, the system reliability is enhanced, and the service life of the system is prolonged. The maintenance time is shortened.
Need to check novelty before this filing date? Find Prior Art