Construction method for newly adding municipal inspection well in rich water pressure sand and gravel layer

Abstract

The invention relates to a construction method for newly adding a municipal inspection well in a rich water pressure sand and gravel layer. Construction method comprises the steps that after a vertical well is built above the rich water pressure sand and gravel layer, a sand and gravel stratum is punched, and then an outer lining pipe and an inner lining pipe are sequentially lowered and fixedly connected with the hole wall through underwater concrete to form a main body of the inspection well. Compared with a traditional brick masonry method, a higher construction speed is achieved, the waterseparation effect is better, and the inflow of groundwater into the inspection well is advantageously reduced. A steel bar frame part of a concrete layer is formed by a longitudinal steel bar and a stirrup, then a formwork is supported by formwork equipment, the concrete layer is formed between the formwork equipment and a clay layer by grouting, and after the concrete layer is solidified, the construction of the inspection well is completed. Compared with an existing method of directly excavating to a to-be-constructed pipeline by 'hanging the well wall upside down', the problems of difficult construction and low safety of the newly added inspection well caused by rich groundwater and high liquidity when the lower soil layer is the rich water pressure sand and gravel layer are solved.

Description

technical field [0001] The invention relates to the technical field of municipal engineering, in particular to a construction method for adding a municipal inspection well to a water-rich pressure sand pebble layer. Background technique [0002] In the water supply and drainage pipeline system, the drainage inspection well is suitable for rain and sewage discharge pipelines. It has important functions such as connecting pipelines, inspecting and maintaining pipelines, and is a necessary auxiliary structure that is convenient for regular inspection, dredging pipelines and preventing pipeline clogging. Some existing municipal pipelines do not meet the requirement of installing a 100-meter inspection well because of the long construction time, or because the special working conditions of the pipeline require it to add inspection wells to maintain certain parts of the pipeline, so it is often Some municipal pipelines that are already in use are being constructed for new inspecti...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a construction method for newly adding a municipal inspection well in the water-rich sandy pebble layer, which effectively solves the problem that the groundwater is abundant when the lower soil layer is a water-rich sandy pebble layer. , the effect of the problems of difficulty in construction and low safety of newly added inspection wells caused by strong fluidity

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