Non-compensation cold mounting method for large diameter heat supply pipeline

Abstract

The invention provides a large-caliber heat-supply pipeline uncompensated cold mounting method, comprising the following steps: digging a groove for arranging a heat-supply pipeline, and filling sand into the groove; mounting the heat-supply pipeline and a corresponding pipeline accessory into the groove; carrying out backfilling on the groove; wherein, the direct-buried net depth of the heat-supply pipeline is more than 1.7m; the pipeline accessory comprises an elbow with a large bending radius, bevel angles, a three-way pipe, a tapered pipe, and a valve; wherein, the bevel angles comprise a plurality of small bevel angles smaller than 1 degree or the elbow the radius of which is more than 5.0DN can be used for replacing; moreover, the mounting method provided by the invention is led to be suitable for paving the heat-supply pipelines the main tubular diameters of which are more than DN1000 by the processing technology on each node of the pipeline; moreover, the invention is simple to be mounted, has short construction period, reduces the maintaining cost, and is safe and reliable.

Description

technical field [0001] The invention relates to a laying method of a heating pipeline, in particular to a non-compensated cold installation method for a large-diameter heating pipeline. Background technique [0002] Around the 1980s, the central heating network in cities generally adopted the pipe trench laying method, that is, the heat network was laid along the brick or reinforced concrete pipe trench. The structure of the pipe trench is huge, the material consumption is large, and the construction period is long. The main contradiction lies in the slow construction speed. In the 1980s, my country gradually began to adopt the direct burial technology of urban heating pipe networks; because the direct burial technology has its unique advantages, such as low energy consumption, simple construction, saving investment, and will not cause damage to the surrounding environment, etc., Direct burial technology is developing rapidly in our country. [0003] At present, the install...

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Problems solved by technology

[0006] At present, the non-compensated cold installation technology of ≤ DN1000 pipes in China has basically matured, but the non-compensated cold installation technology of > DN1000 pipes has no precedent in the domestic or even world heating industry, and the development of large-diameter non-compensated Compensating cold installation technology is very necessary

[0007] As the area of ​​urban central heating becomes larger and larger, the demand for heat supply is also higher and higher, and the main pipeline required for heating supply is also getting thicker and thicker, and the heating parameters (mainly water supply / return water temperature) Therefore, higher requirements are put forward for the use of non-compensated cold installation. The non-compensated cold installation technology with the main diameter of the heating supply ≤ DN1000 can no longer meet the actual needs of the market. Install technology to explore

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