SU1760006A1 - Method for construction of collector-drainage system in watered grounds - Google Patents

Description

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(21) 4823274/15 (22) 07.05.90 (46) 07.09.92. Bul No. 33 (75) E.N. Limansky, V.I. Zelkovsky and G.I. Legostin

(56) Design and construction of horizontal drainage on irrigated lands of the RSFSR. A.N. Matveev et al. Obzorna informacii TSBNTI USSR Ministry of Water Resources. M., 1989, vol. 6, s. 78

(54) METHOD OF CONSTRUCTION OF TORNO-DRAINAGE NETWORK IN WATER GROUND

(57) The invention relates to land reclamation and can be used in the construction of closed drainage in flooded soils. SUMMARY OF THE INVENTION: In the construction of a collector-drainage network in watered soils, the collector is placed in a package consisting of one perforated pipe with a coating of protective filtering material and one non-perforated pipe. In the process of installing the manholes, they overlap the perforated collector pipe in the area above the well being installed, and the wells are mounted from the source of the collector to its mouth.

The invention relates to land reclamation and can be used in the construction of closed horizontal drainage in flooded soils.

The purpose of the invention is to improve the quality of construction by pre-dewatering in the near-collector zone.

The method of construction of the collector-drainage network in the flooded soils is carried out as follows.

Laying the collector leads from the mouth to the source. At the same time, a permanent drainage drainage outside the drainage area is carried out from the wellhead well. The collector is laid by a trench collector. The collector is laid with a package including a perforated drain pipe with a protective filtering coating and an unperforated pipe.

Immediately after laying the collector through perforated groundwater pipes

tap into the wellhead to discharge. As a result, in the area adjacent to the reservoir, the groundwater level drops, and soil collapse and flooding are prevented and water outflow is excluded during the excavation of pit pits for inspection wells and entry holes. This reduces the amount of earthwork, facilitates the installation of wells along the collector road, the joining of flowing drains, and the incision of ground-draining machines for their construction. In addition, as a result of drainage, the Oez collector undergoes partial or full water decrease along the drains, i.e. The drains without any additional measures for the water intake are placed in dry soil, this guarantees quality and stable operation.

After laying the collectors, the manholes are installed. With the passage of pits for wells there is a danger of reverse current

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drainage water from the perforated pipe and flooding the pits. To prevent flooding of the pits, during the installation of each well, water is drained from the perforated pipe to the non-perforated area above the well. The retraction may be performed by blocking the inlet of the perforated pipe in the first overhead well. In this case, the water completely enters the non-perforated pipe and is discharged into the wellhead to be discharged. The non-perforated pipe is ruptured at the well installation site after its installation, which also prevents flooding of the pit under the well.

When installing wells near the collector mouth, it is necessary to divert large volumes of water from the perforated pipe to unperforated water. To reduce the volume of water discharged at each well, it is advisable to install wells from the source to the mouth, i.e. the amount of water discharged at the well is determined by the inflow between the wells.

In order to provide faster and more complete pre-drainage along the drains, it is planned to lay the collector in the lower part of the drainage area, and the drains adjacent to it should be laid in the direction of natural slope. As a result, during the construction period, preliminary draining occurs at the largest part of the drained area.

Claims (1)

Invention Formula A method of building a collector-drainage network in flooded soils, including laying a trench, placing a non-perforated collector pipe therein, mooring manholes and connecting drains to a collector, characterized in that. in order to improve the quality of construction by pre-dewatering in the near-collector zone, simultaneously with the laying of the collector pipe parallel to it, a perforated pipe with a protective-filter coating is laid in the same trench.