RU2074924C1 - Method for construction of combination drainage - Google Patents

Abstract

FIELD: hydraulic engineering and land reclamation. SUBSTANCE: trench is dug out, and placed in it is horizontal drain-collector with filtering overhead fill of gravel and sand mixture. Then, arranged along drain-collector are perforated strengthening holes with unions for connecting pipes located at level of depression curve. Strengthening holes reach up to ground surface and are provided with head-pieces. EFFECT: high efficiency. 1 dwg

Description

 The invention relates to hydraulic engineering and irrigation and drainage construction, and in particular to the construction technology of drainage systems, and can be used in the construction of combined drainage.

A known method of construction of combined drainage, including the connection of a number of vertical drains with individual horizontal recessed collectors by means of corrugated pipes, the ends of which are connected respectively to the drain and collector (see AS 1650867, M. Cl. ³ E 02 B 11/00, publ. May 23, 91).

 This method is difficult to implement, since each well is connected to an individual horizontal reservoir, which with a large number of vertical wells leads to a rise in the cost of construction. Monitoring the operation of the drains is carried out through a tube-socket, the upper end of which is brought to the surface of the earth. However, it is inconvenient to carry out control through a narrow curved tube, and in case of repair of the drain when it is silted, it leads to the shutdown of the drain from operation. To extract the drain to the surface, earthwork is again required.

 Known and can be considered as a prototype a method of building a combined drain, including laying a closed horizontal drain of the collector with a sprinkled filter of granular material, building vertical amplifier wells along it and connecting them to the closed drain-collector by means of water-conducting elements made of granular material. Water supply elements are performed at levels 0.3 0.5 below the bottom of the trench of the drainage collector and above the top of the filter dust (see AS 1537747, class E 02 B 11/00, publ. 1991).

 With this method of construction, a significant amount of granular material, scarce and expensive, is required. Water-conducting elements made of granular material and well-amplifiers are quickly silted up, and for their repair it is necessary to carry out earthwork again, which takes time and capital costs.

 The purpose of the invention is the simplification of construction, combined drainage, repair of its vertical wells-amplifiers during operation.

 This goal is achieved by the fact that the method of construction of combined drainage involves laying a closed horizontal drainage collector with a bulk filter of granular material, building vertical amplifier wells along it and connecting them to a closed drain. Vertical amplifier wells are brought to the surface of the earth. Their connection to the horizontal drain-collector is carried out by means of pipes through which water flows by gravity due to the deviation from the well into the horizontal drain. For the convenience and speed of the work of installers, the pipe is connected to a vertical well-amplifier through a pipe installed before its installation.

 The proposed method for the construction of combined drainage is illustrated in the drawing, which shows a vertical section of a combined drainage system.

 The construction method is implemented as follows.

 First, a trench is torn off, in which a horizontal drain-collector 1 with a filter sprinkling from a gravel-sand mixture is placed. Along the drainage collector at a distance of 0.7 to 1.0 m from it, wells-amplifiers 2 are installed, placing their heads at the level of the earth's surface. The connection of the amplifier wells to the drain-collector is carried out by means of pipes 3, setting them at the level of the depression curve. The connection of the pipe to the amplifier well can be carried out through a pipe installed on the amplifier well prior to its installation. At the same time, during installation, the nozzles are oriented towards the drainage collector. After installation, the trench is covered with soil and compacted.

 The combined drainage system operates in the usual manner, intercepting groundwater near vertical wells and a horizontal reservoir.

 Control over the operation of wells is from the surface of the earth. During operation, the perforation sites of amplifier wells may be clogged with salt deposits. Cleaning is carried out by a bailer or ruff. The rubbish scraped from the walls together with water enters through the pipe 3 into the drain-collector. An important feature of the proposed solution is the fact that in the event of a complete cessation of the operation of a vertical well, it is possible to put the exact same well next to it and, having provided overflow of water from it to the old well at the level of lowering groundwater, restore the drainage process without any additional works.

 If the vertical well-amplifier is also equipped with a submersible pump, it is changed using a truck crane in a short period of time without affecting the operation of the drainage system.

 The method of construction of combined drainage is simple in execution, reliable in operation, and makes it possible to control the technical condition and repair of vertical amplifier wells without opening backfill.

Claims (1)

 A method of construction of combined drainage, including laying a closed horizontal drainage collector with a filter of granular material, placing vertical amplification wells along it and connecting them to a closed horizontal drainage collector, characterized in that the vertical amplification wells are brought to the surface of the earth, and the connection they are carried to a closed horizontal drain-collector by means of pipes inclined towards the horizontal drain.