Large-diameter long-pipe-segment circulating water pipeline crossing construction method

Abstract

The invention provides a large-diameter long-pipe-segment circulating water pipeline crossing construction method which comprises the steps of cutting and blanking; excavating a welding pit, hoistinga steel outer sleeve pipe into a circulating water pipe ditch; fixing a support roller device on the outer wall of the front end of a first section of branched circulating water pipeline; hoisting thefirst section of branched circulating water pipeline into the circulating water pipe ditch, inserting the front end of the first section of branched circulating water pipeline into the steel outer sleeve pipe, utilizing a roller for supporting the front end of the first section of branched circulating water pipeline, and pushing the first section of branched circulating water pipeline to enter the steel outer sleeve pipe; hoisting a second section of branched circulating water pipeline into the circulating water pipe ditch, butt-welding the second section of branched circulating water pipeline and the first section of branched circulating water pipeline, and then pushing the second section of branched circulating water pipeline into the steel outer sleeve pipe; and installing rest branched circulating water pipelines in place according to a method in C3. According to the large-diameter long-pipe-segment circulating water pipeline crossing construction method provided by the invention,rolling friction replaces sliding friction, so that an outer anti-corrosion layer of a circulating water pipeline can be effectively prevented from being damaged; and in addition, the resistance of rolling friction is low, so that the construction can be carried out in an effort-saving way.

Description

technical field [0001] The invention relates to the construction field of circulating water pipelines, in particular to a construction method for piercing large-diameter and long-section circulating water pipelines. Background technique [0002] In special areas such as collapsible loess and expansive soil, according to the current design code, steel outer casings and inspection wells must be installed for buried pipelines within 5 meters of the foundation of the building. In a waste incineration power generation construction project, two Buried circulating water pipelines are installed in the main workshop section Steel outer casing and four inspection wells, the lengths of steel outer casings between the inspection wells are 42 meters, 42 meters, and 30 meters respectively. [0003] There are two common construction methods for the large-diameter and long-section circulating water pipelines to be equipped with steel outer casings. Common method one: firstly combine t...

AI Technical Summary

Problems solved by technology

Disadvantage 1: The space required for the circulating water pipeline to be installed with a steel outer sleeve is relatively large, that is, the combined circulating water pipeline plus the length of the steel outer sleeve; Disadvantage 2: When the circulating water pipeline is dragged into the steel outer sleeve, It is very easy to damage the outer anti-corrosion layer of the circulating water pipeline, and it cannot be repaired after damage; the third disadvantage: the circulating water pipeline equipped with a steel outer casing is long in length and heavy in weight, and two cranes are required to lift the lower ditch in place, increasing The equipment cost and construction cost are reduced, and the double-machine lifting is a relatively dangerous construction project, which increases the safety risk

Disadvantage 1: The hoist is not easy to arrange in the ditch of the circulating water pipe, and it is difficult to set the ground anchor; Disadvantage 2: When the circulating water pipe is dragged into the steel outer casing, it is very easy to damage the outer anti-corrosion layer of the circulating water pipe, and it cannot be used after damage. Remediation; Disadvantage 3: The circulating water pipe ditch must be over-excavated on the penetrating side of the lower ditch working surface of the long pipe section of the circulating water pipe, which increases the construction cost

From the above analysis, it can be seen that the two common construction methods for installing steel outer casings on circulating water pipes are difficult to construct, high in construction costs, and relatively high in safety risks; at the same time, the circulating water pipes are easily damaged during the installation process. The outer anti-corrosion layer cannot be repaired after damage, and the construction quality cannot be guaranteed, leaving a large quality hidden danger

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