RU2533912C1 - Method to clean river beds near bridges - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: in river bed in left-bank and right-bank point bars near bridges they arrange partitioning control structures in the form of piled rows of metal pipes, or rails, or concrete piles inclined along the flow.

EFFECT: increased efficiency of river bed cleaning.

3 cl, 3 dwg

Description

The invention relates to hydrology, hydraulic engineering, bridge construction. It can be used when skipping maximum costs during floods and floods to ensure the safety of bridges, to prevent emergencies, to prevent possible flooding of adjacent settlements due to overlapping bridge spans with fins, damaged trees, shrubs.

The well-known "Method of hydraulic washing of the channel of a water stream" (author's certificate No. 1130638, IPC E02B 3/02, 1984), regulated by the sequential arrangement of blocking hydraulic structures.

The disadvantages of this method are clogging the passage of the hydraulic structures with floating trees, shrubs, reeds and other mechanical impurities; the need for constant monitoring of the level of accumulated water, its timely discharge and the quality of the channel cleaning; the difficulty of coordinating the sequence, flow rate and volume of water flow between hydraulic structures, as well as time intervals between them; the impossibility of a comprehensive solution to the problem of cleaning, deepening and straightening the river bed in combination with the protection of ichthyofauna.

The closest in essential features is the "Method of cleaning, deepening and straightening the river bed" (patent for invention RU 2450101 C2, IPC E02B 3/02 (2006.01), E02B 15/00 (2006.01).

The disadvantage of this method is that the creation of blocking structures is preceded by a long preparation process - in the autumn, depressions are performed in silted places, and in winter, ice freezing is performed, in addition, the method is seasonal.

An object of the invention is to ensure trouble-free operation of bridge spans, preventing flooding of adjacent areas due to rising water levels due to fouling by fins (branches and trees) of bridge spans.

The difference of this invention lies in the fact that in the present invention uses the natural process of creating on the lowland rivers during floods the distribution of depths. So, for example, in the bends of rivers deep-water sections of the river - stretches are formed, and rifts on relatively rectilinear sections connecting two adjacent bends. The crest of a large ridge that crosses the channel, usually flooded in high water and drying in the coastal part at low water (dry period), is called a side stream.

The problem is solved in a method of cleaning riverbeds near bridges, including the installation of blocking regulatory structures that facilitate the cleaning of riverbeds, characterized in that in the riverbed in the left-bank and right-bank sidewalks of rifts near the bridges, blocking regulatory structures are arranged in the form of pile rows of metal rows inclined along the course of the flow pipes (rails, concrete piles, etc.).

Using these features of the distribution of depths along the length and width of the river, the invention proposes to arrange blocking control structures in the form of oblique along the course of the flow of pile rows of metal pipes in the river channel in the left-bank and right-bank sidewalks of riffles near bridges.

The pile row of pipes should be arranged for the thickness of tree trunks above the water levels P = 0.1% of supply (i.e. in a catastrophically high-water period). Every year in high water and high water, i.e. during a period of high water level in the river, there will be a rise from the bottom and transfer of large branches, trees by the water stream to the sidewalks, where they will be detained on stilts. With the accumulation and compaction of branches and trees on piles, the sidewalls become guiding faces. As a result, the water flow begins to straighten and move along the line of greatest depths - along the fairway, while increasing depth.

The method of cleaning riverbeds near bridges is as follows.

At the beginning, in the channel of the river 3 in the left-bank 1 and right-bank 2 sidewalks near the bridges 4, barrier control structures are arranged in the form of pile rows of metal pipes (rails, concrete piles) inclined along the course of the flow. 5. A pipe row of pipes is arranged above water levels at P = 0.1% security, which will ensure the retention of trees 6 by the thickness of the trunks.

To ensure trouble-free operation of bridge spans in a straight channel in front of the bridge, at an estimated distance of "Lct", a free passage zone is arranged to stabilize the flow with the help of blocking adjustable structures from metal pipes (rails, concrete piles) 5.

To prevent bridge spans from clogging, a free zone (without piles over the entire width of the river) is arranged at a calculated distance using blocking adjustable structures in a straightened channel in front of the bridge.

Figure 1 presents a method of cleaning riverbeds near bridges.

Figure 2 presents the possible zones of the arrangement of pile rows of metal pipes (rails, concrete piles).

Figure 3 presents a section along a pile row with delayed branches and trees at the maximum (P = 0.1%) and minimum marks (low-water period) of the water level in the river.

The numbers in the drawings denote: 1, 2 - left-bank and right-bank sideways of rifts; 3 - river bed; 4 - bridge; 5 - metal pipes (rails, concrete piles); 6 - trees.

The proposed method allows to clean the river from the fin, provides non-clogging of the bridge spans and, as a result, their trouble-free operation, non-flooding of settlements adjacent to the bridge, straightening of the river.

In the implementation of the invention, the task is solved by achieving a technical result, which consists in restoring the natural state of the river bed, trouble-free operation of bridge flights, reducing the cost of cleaning from the fin.

Claims (3)

1. A method of cleaning riverbeds near bridges, including blocking control structures that facilitate the cleaning of the channel, characterized in that in the river channel in the left-bank and right-bank sidewalks of riffles near bridges, blocking regulatory structures are arranged in the form of pile pipes of metal pipes or rails inclined along the course of the flow , or concrete piles. 2. The method according to claim 1, characterized in that the pile row should be arranged above the water level P = 0.1% of the supply, which will ensure the retention of trees by the thickness of the trunks. 3. The method according to claim 1, characterized in that to ensure trouble-free operation of bridge spans in a straightened channel in front of the bridge at a calculated distance with the help of blocking adjustable structures to stabilize the flow, a free zone should be arranged.

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