RU2512031C2 - Method of erection of underground horizontal water intake of combined structure - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to hydraulic engineering construction, namely, to water intake structures, namely, to water intake structures, and may be used for water intake from underground sources with shallow beds of underground water. The method of erection of an underground horizontal water intake of a combined structure, including a water receiving trench 1 and a water collection well 7, consists in laying of gabion mats 2 in longitudinal rows on the bottom of the water receiving trench 1 with drainage devices. Gabion mats 2 are made of light fascines and perforated pipes, laid in alternating rows and rolled into a gabion net. On top of gabion mats 2 along the trench they lay flexible mats 5, made of a drainage filler, which is made of tight rows of light fascines rolled into a geonet. In the end part of the trench there is a rigid tray 6 of rectangular cross section, the cantilever part of which with an inclination enters into a water collection well 7. Gabion mats with drainage devices are laid from the trench to the middle of the tray.

EFFECT: higher efficiency of operation of a water intake structure and reduced labour intensiveness of construction.

5 dwg

Description

The invention relates to hydraulic engineering, and in particular to water intake structures used for abstraction of water from underground sources with shallow occurrence of groundwater.

A relatively close technical solution is the underground horizontal water intake method [1, 2], including the manufacture of a water-receiving stone-gravel trench and a drainage well. The main disadvantages of this technical solution are the low efficiency and the need for a large amount of stone material.

The purpose of the invention is to increase work efficiency and reduce the complexity of construction.

This goal is achieved by the fact that in the method of constructing an underground horizontal water intake, including a water intake trench and a drainage well, gabion mattresses with drainage devices consisting of light fascines and perforated pipes laid in alternating rows and wrapped in a gabion are laid in longitudinal rows at the bottom of the water intake trench flexible mattresses are laid on top of the gabion mattresses along the trench, consisting of a draining aggregate made of dense rows of light fascines wrapped in a geos weave, and in the mouth of the trench provide a rigid tray of rectangular cross section, the cantilever part of which with a slope enters the drainage well, while gabion mattresses with drainage devices are laid from the trench to the middle of the tray.

Figure 1 shows a longitudinal section of the main section of the horizontal underground water intake; figure 2 is the same in plan; figure 3 is a cross section of an underground horizontal water intake; figure 4 - gabion mattress; figure 5 - flexible mattress; figure 6 shows a light fascin from dry reeds.

The underground horizontal water intake consists of a water receiving trench 1, gabion mattresses 2 with drainage devices made of light fascines 3 and perforated pipes 4, laid in layers and wrapped in a gabion net. On top of the gabion mattresses 2 flexible mattresses 5 are laid in longitudinal rows, made of light fascia 3, wrapped in a geogrid. A rigid tray 6 of rectangular cross section is arranged in the mouth of the trench 1, laid along the slope of the trench with a cantilever inlet to the drainage well 7. For intake of water from the well 7, a suction pipe 8 is arranged.

The method of construction of an underground horizontal water intake is carried out and works as follows.

First, dry and ripened reeds are harvested in sufficient quantities and brought to the construction site of the water intake. Then, the required number of light fashions 3 is made from reeds, of which, laying in layers with perforated pipes 4, gabion mattresses are made 2. From light fashions 3, wrapping them in a geogrid for 4-5 pieces, flexible mattresses are also made 5. Next, in the aquifer soil, with a shallow depth of the groundwater level, develop a water intake trench 1 of the required depth and width, as well as a hole for the drainage well 7. After that, plan the bottom of the hole for the drainage well 7, and the bottom of the trench 1 for gabion mattresses 2, flexible mattresses 5 and a gesture rd tray 6. In this case, the trench slope toward the well 1 7, providing efficient reception and discharge of filtered water is 0.02 ... 0.05. Then simultaneously build a drainage well 7 and a rigid tray 6 of concrete, reinforced concrete or other safe polymeric material. After gaining the necessary strength of the materials of the well 7 and the tray 6, gabion mattresses are laid in two tight rows along the trench so that the perforated pipes 4 (adjacent to the mattresses 2) respectively enter each other along the slope and the flow of water. Thus, the gabion mattresses 2 are mounted along the entire length of the trench 1 to the middle of the hard tray 6. On top of the gabion mattresses, flexible mattresses 5 are also laid in longitudinal rows, in dense rows in two layers with a dressing and attached in places to the gabion mattresses 2. Gabion mattresses can have the following sizes : 30 × 20 × 120 cm, 35 × 25 × 150 cm, 40 × 30 × 200 cm and others. Flexible mattresses 5 are made 150-200 cm long and 20-25 cm in diameter. Then, on top of the flexible mattresses, they lay the soil (taken out of the aquifer) onto the top of the trench with a uniform compaction to its natural state. At the end, a suction pipe is mounted in the drainage well 7 so that the inlet of the nozzle is 30 cm above the bottom. After the construction is completed, the area around the water intake structure is planned and equipped so that the surface water flow does not penetrate into trench 1 or into well 7.

The underground horizontal water intake of a combined design, constructed by the proposed method, works as follows. Due to the fact that the groundwater level is higher than gabion and flexible mattresses, water flows by gravity to flexible mattresses 5, which have good water intake properties. From them - to gabion mattresses 2, where water penetrates through the water inlets into the perforated drainage pipes 4, which ensure (due to the slope) the transportation and ingress of water through the hard tray 6 into the drainage well 7. Lightweight fascia 3 made from dry reeds are good drainage material that retains its properties (without decomposition) for 15-20 years. After 12-15 years, the drainage materials of the water-receiving trench, i.e. gabion 2 and flexible mattresses 5 were replaced and repositioned. To ensure efficient operation of the structure from the catchment well, it is necessary to ensure continuous water intake through the suction pipe of a stationary pump station or a deep pump.

The underground horizontal water intake of a combined construction, erected by the proposed method, can be most effectively used in coastal and floodplain areas of aquifers with a depth of occurrence of a pressureless groundwater level of up to 7 m.

The method of erecting an underground horizontal water intake is intended for water supply to a small settlement, agricultural enterprise, farm and individual households.

Literature

1. A.M. Tugai Water Supply. Water intake facilities. - Kiev .: Vishka school. Head Publishing House 1984. S.163-165.

2. Abramov I.N. Water supply. -M .: 1982 - p. 191-194.

Claims (1)

A method of erecting an underground horizontal water intake of a combined structure, including a water intake trench and a water well, characterized in that gabion mattresses with drainage devices consisting of light fascines and perforated pipes laid in alternating rows and wrapped in gabion mesh are laid in longitudinal rows at the bottom of the water intake trench flexible mattresses are placed along the trench of the gabion mattresses, consisting of a draining aggregate, which is made of dense rows of light fascines, wrapped utyh a geogrid, and in the end portion of the trench provide rigid tray rectangular, cantilevered portion which includes a sloping drainage well, wherein the gabion mattresses with drainage devices are placed from the trench to the middle of the tray.

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