Mounting method of water injection and natural pipe sinking river-crossing pipeline

Abstract

The invention discloses a mounting method of a water injection and natural pipe sinking river-crossing pipeline. The mounting method comprises the following steps that construction surveying and positioning are conducted; river bottom foundation pits are excavated to form a groove; the river-crossing pipeline is welded on a river beach, and weld joints are reinforced; the river-crossing pipeline is subjected to first-time water injection and pressure testing on a shore; the river-crossing pipeline is put into a river and floated and pulled in place; the river-crossing pipeline is filled with water and centralized; the river-crossing pipeline is subjected to positioning recheck; the river-crossing pipeline is naturally sunken into the groove; the river-crossing pipeline is subjected to second-time water injection and pipeline pressure testing; after pressure testing is qualified, cyclopean concrete piers are poured for last fixing; a riverbed is restored; and acceptance check is conducted. The natural pipe sinking technology is adopted, and pipe interior water injection is completed through mutual cooperation of water inlets, air exhausts, openable valves and the like which are formed / arranged in / at the two ends of the pipeline; and the water injection quantity is manually controlled, the sum of the weight of injected water and the pipeline is controlled to be equal to the buoyancy of the pipeline, so that the pipeline is naturally sunken, the accuracy of the pipe sinking position can be guaranteed, and large-height-difference large-span river-crossing pipeline mounting is achieved.

Description

technical field [0001] The invention relates to a method for installing a pipeline, in particular to a method for installing a water-flooded naturally immersed pipe for crossing a river. Background technique [0002] The existing immersed pipe technology is hoisting technology with openings at both ends and double sides. This technology injects water at both ends of the water pipe synchronously by dragging it to the river surface, and drives steel pipe piles at both ends of the outer edge line of the downstream design of the pipe position. Two pipe piles are set up as vertical guide rails for positioning and sinking of pipelines to assist the sinking of pipelines. Under the control of water flow and tugboats, the pipelines sink along the vertical guide rails. [0003] The shortcomings of this technology: the speed of water injection cannot be controlled, which may cause the unbalanced sinking of the entire pipeline, causing the pipeline to deviate from the axis, cracks may o...

AI Technical Summary

Problems solved by technology

[0003] The shortcomings of this technology: the speed of water injection cannot be controlled, which may cause the unbalanced sinking of the entire pipeline, causing the pipeline to deviate from the axis, cracks may occur at the weld, and the tap water pipeline will be mixed with sediment during use. The accumulation of sediment in the pipes is difficult to clean up, resulting in the blockage of the water pipes and the inability to transport tap water normally

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