Hole opening tool under pressure and hole opening process

Abstract

The invention belongs to the technical field of pipeline hole opening under pressure, in particular to a hole opening tool under pressure and a hole opening process for a composite pipeline with a PE(polyethylene) lining pipe. A PE pipe fitting with a pre-buried electric heating wire, a PE saddle and a PE flange is used in the hole opening process. The construction process is characterized in that a branch line hole opening method that holeopening is required to be connected with a branch line without stopping and disconnecting the main pipeline after the pipeline is repaired by using the PElining pipe is adopted, a part of the old pipeline is removed at the hole opening position, the prefabricatedPE pipe fitting with the pre-buried electric heating wire, the PE saddle and the PE flangeis welded to the hole opening position of the PE lining pipe in an electric melting mode, a pipe hoop is installed to sleeve the PE pipe fitting and the exposed part of the PE lining pipe at the old pipeline removal part, a branch line valve is installed, the hole opening tool under pressure is installed, the branch line valve is closed after the hole opening operation under pressure is finished,and the hole opening tool under pressure is disassembled. The newly-added branch line hole opening of the composite pipeline with the PE lining pipe is realized through a non-stop conveying hole opening mode under pressure.

Description

technical field [0001] The invention belongs to the technical field of pipe under-pressure drilling, in particular to a under-pressure drilling tool and a drilling process for a composite pipe with a PE inner lining pipe. Background technique [0002] Drilling under pressure is a safe, environmentally friendly, economical and efficient pipeline maintenance and emergency repair technology in service. rush repairs under pressure, replacement of corroded pipe sections, installation of devices, distribution and transformation, etc.), pressure vessels and industrial pipelines state expressly stipulate that when there is internal pressure, no maintenance shall be carried out. For special production processes, it is necessary to tighten with temperate belt pressure When bolts are used, or when an emergency leak occurs and needs to be sealed under pressure, the user shall put forward effective operation requirements and protective measures in accordance with the design regulations, ...

AI Technical Summary

Problems solved by technology

[0004] However, the pressurized hole opening tool of the prior art judges whether the hole cutting has been completed by whether the hand wheel can be rotated and feeds the knife, which will cause the hole hole tool to cut the top wall layer of the PE pipe to be holed quickly. Sliding down to the bottom wall layer of the PE pipe to be drilled, causing damage to the PE pipe, and even dis

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