Blocking Method of Deep Buried Large Diameter Disused Sewage Pipeline

Abstract

The invention discloses a plugging method of a deep-buried large-diameter waste water pipeline.Firstly, a plugging position is determined, a drill bit with the diameter larger than the outer diameter of a sewage pipeline by 25-50 mm is selected for vertical drilling, and the drill bit penetrates through the bottom of the sewage pipeline by 500 mm; backfilling is performed with plain soil through a loader, tamping is performed in layers, and backfilling is performed with the plain soil till backfilling height is larger than the top of the pipeline by 500 mm; a drill bit with the diameter equal to the outer diameter of the sewage pipeline is selected for drilling in backfill soil till drilling depth is 500 mm away from the bottom of the sewage pipeline; a guiding pipe is lowered, concrete is adopted for pouring plugging till a concrete face is higher than the top face of the sewage pipeline by 500 mm, and construction is completed.According to the method, no staff needs to go down to a well for operation during plugging construction, the risk caused when staff goes down to a well for operation is reduced, plain soil and a concrete plug are adopted for plugging construction, tamped plain soil is utilized for surrounding and blocking poured concrete pulp, the using amount of plugging concrete is reduced, the poured concrete forms a pipe plug, brick building construction is not needed, and the construction cost is greatly saved.

Description

Technical field [0001] The invention relates to the treatment of waste sewage pipelines, in particular to a method for plugging deep buried waste pipelines with large diameters. Background technique [0002] Large sewage pipelines in cities are generally buried deep (about 8 meters underground) due to the characteristics of the transported medium. With the rapid development of today's cities, the development and utilization of subways and underground spaces often conflict with buried underground pipelines, and the original pipelines need to be relocated. Due to the large diameter of sewage pipes (all over one meter), if the abandoned pipes are not blocked, subsequent construction will be affected (for example, a large amount of mud will be lost during the construction of bored piles and concrete cannot be poured. To design elevation). In this regard, it is necessary to block the abandoned sewage pipes. The existing plugging method mainly relies on manual plugging from the insp...

AI Technical Summary

Problems solved by technology

Due to the deep sewage pipeline, the underground environment is harsh, and the air is not smooth, there may be CH 4 , CO and other toxic gases, although it is required to "drain the water and change the gas" before going into the well, and take preventive measures against the possible incoming water from the upstream of the sewage pipeline and the return water from the downstream to impact the underground operators as required, and adopt effective vulcanization The absolute value of hydrogen sulfide at the working point and adjacent points measured by the hydrogen tester is less than 10 micrograms, and the original ventilation measures must be kept unchanged before going into the well. Experienced professional team, the cost is relatively high, and the risk of personnel going into the well is still high under various sufficient preparation conditions