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Standard design of square rainwater pipes:

Standard design of square rainwater pipes:

1. Rainstorm intensity refers to the amount of rainfall in a continuous period during the rainfall process.

2. Drainage area refers to the area from the square rainwater pipe to the rainwater collection.

3. Bottom catchment time refers to the time when water flows from the boundary of the discharge area to the starting point of the main pipe.

4. Runoff coefficient refers to the ratio of the amount of rainwater flowing into the pipeline to the total amount of rainwater.

5. The recurrence period of rainstorm refers to the average time interval equal to or greater than the specified intensity of rainstorm. Because the construction and maintenance of rainwater pipelines have great interference on road traffic, rainwater pipelines should be laid directly under green belts or wider sidewalks instead of under the lanes of main traffic arteries, and keep a certain lateral distance from the trees, poles and sidestones. In addition, rainwater pipelines should avoid or reduce crossing with rivers, railways, and other urban underground pipelines as much as possible to avoid construction difficulties; when crossing, they should be as orthogonal as possible and ensure that there is a certain vertical gap between them.

Requirements analysis before backfilling of square rainwater pipes and ditches:

The turning point, starting and ending point, coordinates of well chamber and pipe top elevation of pipeline have been checked and accepted by concealed engineering. After the buried pressure pipeline is laid, its coordinates, elevation and anticorrosive coating are checked together, and the main body of the pipeline section can be backfilled after acceptance of the concealed project. There is no water or debris in the groove. The required well room can be backfilled only after the water closure test is qualified.

Construction procedure of square rainwater pipe: square rainwater UPVC socket and intubation construction procedure, trench excavation, sand cushion, lower pipe, top rubber ring jacking, interface, inspection well masonry, backfilling trench excavation using backhoe excavator with manual excavation of sewage rainwater trench, surveyors accurately measure the horizontal position during trench cleaning, and prohibit the phenomenon of “over-excavation” and “deficit excavation”. When geological conditions are not in conformity with the design during excavation, timely contact with the supervisor and the owner to obtain a reasonable construction plan. According to the soil and pipeline structure, according to the design requirements of drawings, reasonable selection of a certain width of working face, and timely tracking measurement. When manual grooving, attention should be paid to the width and depth of the groove, and the wire should be hanging smoothly. The frog rammer should be used to compact the groove, and the surveyor should timely carry out the re-survey of the horizontal elevation and the check of the middle line of the pipe and canal. After tamping is completed, the tester takes samples and the compactness meets the design requirements before the construction of the next process.

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