Construction method of steel-jacketed steel steam direct burial pipeline

Abstract

The invention discloses a construction method of a steel-jacketed steel steam direct burial pipeline. The method comprises the following steps of construction preparation, pipeline transportation andhoisting in place, working pipe butt-joint installation, working pipe butt-joint welding, working pipe welded junction inspection, working pipe hydraulic pressure test, outer protection pipe and working pipe temporary fixing and dismounting, working pipe welded junction corrosion prevention and heat preservation, outer protection pipe joint welding, outer protection pipe joint welding inspection,outer protection pipe joint corrosion prevention, pipe ditch backfilling, and working pipe purge. According to the method, the whole set of mature and systematic construction method is continuously improved in the actual installation and construction process, the construction method is detailed in content, reasonable in standard requirement preparation, simple in process and reasonable in procedure, compared with conventional installation, the construction period is shortened, equipment machine-team use is saved, consumed materials are saved, the working efficiency is improved, material lossesare correspondingly reduced, the construction cost is reduced, civilized construction is facilitated, improvement of environmental protection measures is facilitated, labor, equipment and material cost are saved, and good economic benefits, social benefits and environmental benefits are generated.

Description

[0001] 1. Technical field: [0002] The present invention relates to a construction method for direct-buried steel-sheathed steel thermal pipelines, in particular to a construction method for direct-buried steel-sheathed steel steam pipelines, which is applicable to the fields of petroleum, natural gas, chemical industry, electric power, military industry, pharmacy, papermaking, heat supply, etc. Inner steel sheathed steel steam direct buried pipeline construction. [0003] 2. Background technology: [0004] With the strengthening of environmental governance in our country, centralized heating has begun, resulting in a large number of long-distance heat external pipe network projects; traditional thermal external pipe network projects are basically divided into overhead laying and trench laying; among them, overhead laying, The pipelines are criss-crossed, occupy a large area, affect the city appearance, and are extremely inconsistent with the modern civilization of the city; w...

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Problems solved by technology

[0005] Steel jacketed steel steam direct buried pipeline has the characteristics of saving floor space and reducing the underground space occupied by the pipeline network, especially when the urban underground space is occupied by various pipeline infrastructure and the space is relatively narrow, this advantage is more obvious; Steel-sheathed steel steam direct buried pipelines are mainly used in long-distance buried heat pipe network projects. The pipeline construction is mainly long-distance buried construction, which are all concealed projects. The installation needs to go through the excavation of pipe trenches, pipeline lifting, and pipeline installation. , pipeline welding, tightness test, pipe trench backfilling and many other steps; the installation has high requirements for personnel and equipment, many influencing factors, and the installation period is long, and it will encounter rainy season, cold climate, strong wind environment and high groundwater level, etc. special circumstances

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