Method to erect spillway channel of polygonal profile with flexible fixation

FIELD: construction.

SUBSTANCE: invention relates to hydraulic engineering, namely, to channels used in water-engineering systems and irrigation systems as open spillway structures. The method includes erection of a channel of polygonal profile with two pairs of symmetrical slopes and a triangular base. Reinforced concrete anchor beams 1 are laid into a single longitudinal row along the top of the triangular base. At the left and right to these beams they fix gabion mats 2, laid across the riverbed along the line of bottom slopes m2. Gabion mats 2 are made of light fascines and perforated pipes laid in layers into a metal net. Along the line of side slopes m1 in tight rows they lay flexible mats 3, made from light fascines, wrapped into a geonet of tubular shape. Gabion 2 and flexible 3 mats are tied to each other with the help of a metal wire and in some points are attached to slopes of the channel with the help of reinforcement rods 4. The method may be most efficiently used in low-head dam and dam-free water-engineering systems, and also a manifold irrigation network in piedmont and mountain hard-to-access areas.

EFFECT: channel of polygonal profile, erected by the proposed method, turns into a reliable spillway or coupling structure of open type, designed for safe passage or discharge of maximum possible water flows.

5 dwg

 

The invention relates to hydraulic construction, namely the channels used in waterworks and main irrigation network as an open spillway structures.

Known hydraulic channel [1], which includes a polygonal cross-section with two pairs of symmetric slopes and triangular base, passing into earth soils and concrete lining. The main disadvantage of this technical solution is the low efficiency and reliability in conditions when the track channel is erodible soils and with high slope, and channel large volumes of sediment.

The purpose of the invention is to improve the efficiency and reliability of the channel through the use of flexible mounts.

This goal is achieved by the fact that the method of construction of the spillway channel polygonal profile, comprising two parts with symmetrical pairs of slopes, top with slope mi and bottom with ground lines m1and triangular base, the apex of the triangular base in one longitudinal row are placed concrete anchor beams, left and right to this beam attach gabion mattresses laid across the bed on the bottom line of slope m1while gabion mattresses are made of layers stacked in a metal grid lung Pasini perforated pipes, and on the side slopes of m1dense rows of stacked flexible mattresses, made of light fashin, geogrid wrapped in tubular form, and flexible gabion mattresses connects together using metal wire and seats attached to the jamb channel by using rebar.

Figure 1 shows a cross section of the channel polygonal profile; figure 2 is a plot of channel plan; figure 3 is a section along the longitudinal axis of the channel; 4 - gabion mattress, figure 5 is a flexible mattress from the lungs fashin.

Channel polygonal profile consists of reinforced concrete beams 1, arranged along the line of the vertex of the triangular base, gabion mattresses 2, laid on the bottom line of slope m2and attached to concrete beams, flexible 3 mattresses laid on the line side slopes m1. Gabion mattresses 2 and flexible mattresses 3 attached seats to the slopes with rebar 4.

The method of construction of the spillway channel polygonal profile is constructed and operates as follows.

Initially planned route of the channel with reference to the ground, developing a recess of polygonal cross-section with two symmetrical pairs of slopes m1and m2then planned these slopes. Work is also underway on the production of reinforced concrete beams 1, 2 gabion and flexible 3 mattresses insuranee harvested materials according to their size. Light Pasini made from dried reeds, and from the lungs fashin-and flexible gabion mattresses using corrugated pipes, gabion and polymer (geogrids) grids. Gabion mattresses 2 are made of alternating rows of light fashin and perforated pipe wrapped in gabion mesh (length of 2-2,5 m, a width of 0.4-0.6 m and a thickness of 0.3-0.4 m). Flexible mattresses perform 3 of 4-5 rows of light fashin wrapped in geogrid (length of 2-2,5 m and a diameter of 20-25 cm). And light Pasini made from a bundle of dry reeds, tied in three places with a metal wire (2,2,5 m and a diameter of 10-15 cm). Reinforced concrete beams 1 can be made in place of reinforced concrete or industrially in the form of precast beams. In the first case, on the spot at the base line of the triangular top sections and dimensions set formwork with steel frame and poured concrete. After dialing the primary strength concrete dismantle formwork, then these beams 1 with two sides attach gabion mattresses 2 and stack them on the bottom line slopes. In the second case, precast beams 1 are mounted on the sections, and they also attach gabion mattresses 2, stacked on line the bottom of slopes. The dimensions of reinforced concrete beams made depending on the specific conditions of the channel, including hydraulic (20×20 cm, 25×25 cm, 30×20 cm, 30×30 cm, 30×40cm and others) then on the line side slopes stack of flexible mattresses 3 with a tight connection with gabion mattresses 2. When this top and flexible gabion mattresses places score reinforcing bars (3, 8-10 mm, l=30-50 cm).

Working channel polygonal profile in the following way. When the flow of water through the channel main hydrodynamic loads its focus on the center of the channel, along the lines of the triangular base. Scour flow directed along the bottom and side slopes, with the flexibility and permeability of the mattress 2 and 3, these forces are distributed and redistributed evenly on all slopes polygonal cross-section. Gabion 2 and Flex 3 mattresses at the same time work as a protective attachment and how the drainage system. Through these mattresses 2 and 3, the water seeps into the soils of bottom and side slopes and back slopes through these mattresses water goes in the channel bed. Any deformations in the underlying soils do not occur, not suppose and contact erosion of the soil under the mattress 2 and 3. As light fachini, which basically made these mattresses are good drainage and filter materials. However, the grout pressure mattresses does not occur, the possible ascent of mattresses (especially flexible mattresses 3) is excluded because all e and mattresses are strongly correlated and linked to concrete beams 1, in addition they were nailed to the walls with rebar 4. If the flow of water abrasive and other major sediment, they concentrate along the triangular base of the channel and starting from there to the top of the side slopes, score big and small its particles penetrating deep into) all these mattresses. Thus, there is a weighting of these mattresses 2 and 3, respectively, and increase their protective (protiwaritmicakih) functions. Channel polygonal profile with flexible mountings of these mattresses 2 and 3, turns into a reliable conduit (or interfacing) construction open type, designed to safely pass or reset the maximum possible water flow.

After some time the slopes of the channel may overgrown grass or shrubs, with their root system, which permeates the mount to the depth of the slopes provides additional strength flexible and gabion mattresses 3 and 2. When it is periodically necessary to mow, grown on the slopes of the plant, to provide the necessary bandwidth.

Channel polygonal profile with a flexible mount, constructed by the proposed method is most effectively can be used in the composition of low-head dams and waterworks dam, and the main irrigation network on the foothill and mountain Tr is nedostupnyh sites.

Sources of information

1. Copyright certificate №1640271. Hydraulic channel. MCI EV 5/00 / S.O. Kurbanov, NV Khans (USSR). Bull. No. 13, 1991

The method of construction of the spillway channel polygonal profile, comprising two parts with symmetrical pairs of slopes, top with slope m1and bottom with ground lines m2and triangular base, wherein the vertex of the triangular base in one longitudinal row are placed concrete anchor beams, left and right to these beams attach gabion mattresses, laid across the bed on the bottom line of slope m2while gabion mattresses are made of layers stacked in a metal grid lung fashin and perforated pipes, and on the side slopes of m1dense rows of stacked flexible mattresses, made of light fashin, geogrid wrapped in tubular form, and flexible gabion mattresses connects together using metal wire and seats attached to the jamb channel by using rebar.



 

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