RU2338833C1 - Method of protection building against undermining of bank protection structures foundations - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention is related to hydrotechnical construction of coast-protecting structures in washed riverbeds, canals and other structures. On dam slope bed is arranged in the form of gravel filling. Anti-piping device is laid on the bed. On top of anti-piping device in slope plates are laid, and flexible apron is connected to slope support. Flexible apron is assembled from separate beams with through openings by putting of beams on metal rods. Number of through openings should be at least two. Between beams in the process of flexible apron assembly soft washer inserts are put on for giving of higher flexibility in case of slop support foundation washing and apron descent. Metal rods are fixed to foundation of slope support. After assembly of flexible apron the structure is tightened with fastening bolts provided in the end of metal rods.

EFFECT: increase of coast-protecting structures service life, reduction of expenses for their building, increase of efficiency and reliability of coastal protection in riverbeds and canals against washing.

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Description

The invention relates to hydraulic engineering and can be used to protect the foundations of shore protection structures in eroded riverbeds, canals and other structures.

A known method of erection of a flexible slope fastening [1], in which on the prepared base of the slope, laid in the form of a reverse gravel or crushed stone filter, the braided mesh rolls with the long side transverse to the direction of flow are laid out in an overlap. The nets are interconnected by a connecting wire and forming an integral carpet with an apron or a recessed base and anchors fixed to the slope, clogged normally to the slope surface. Concrete or a high-strength mortar, evenly covering it, on which wear-resistant materials are tightly laid, are successively laid on top of the woven mesh. The disadvantages of this technical solution are:

- this design of a flexible "apron" and the method of its construction is quite complicated;

- low labor productivity;

- in the winter period of time when laying monolithic concrete, additional costs are required.

The closest technical solution is the method of erection of a flexible sloping fastening [2]. Concrete mattresses are pivotally connected in knots by a special twisting device.

The disadvantages of this technical solution are:

- the flexibility of the “apron” design, insufficient to protect against washing out the base of the dam mounting;

- during operation, the compounds under the influence of the dynamic effects of the water stream are abraded.

The purpose of the invention is to increase the efficiency and reliability of protection from undermining the bases of the fastenings of the banks of riverbeds and channels from erosion and the durability of the service life of the shore protection structure.

This goal is achieved by the fact that on the slope of dam 1 (Fig. 1), preparation is arranged in the form of gravel dumping with a thickness of 20-30 cm, which is carefully planned after. An anti-suffusion device is laid on the preparation, as of which geotextiles are usually used today. An anti-suffusion device is necessary in order to prevent mechanical suffusion, from under flexible slanting. On top of the anti-suffusion device, a flexible slant mount is mounted (Fig. 2) with an apron device. To protect from washing out the base of the slope of the dam, a flexible “apron” is provided, which is attached to it. A flexible “apron” is assembled by putting on metal bars of prefabricated beams having through holes. The number of through holes should be at least two. Between the beams during the assembly of the flexible “apron” soft washers are put on between them to give increased flexibility when washing and lowering. Metal rods are attached to the base of the sloping mount. At the end of the metal rods after assembling the flexible “apron”, fixing bolts are provided that tighten the structure.

In Fig.1 shows a cross section of a dam with a flexible sloping mount and a flexible "apron", General view; figure 2 is a top view of a flexible slant mount, General view; figure 3 - flexible "apron" in the assembly, a perspective view.

On the slope of dam 1, preparation 2 is arranged, on which the anti-suffusion device 3 is laid, and on top is a flexible slant mount 4 with a flexible “apron” 5. A flexible slant mount 4 consists of plates 6. A flexible “apron” 5 is assembled by putting on 7 prefabricated metal rods beams 8 with soft washers 9 installed between them. Metal rods 7 are attached to the base of the sloping mount 4. At the end of the metal rods 7, after assembly of the flexible “apron” 5, fixing bolts 10 are provided.

The method of erection of protection from undermining the bases of shore protection structures is carried out and works as follows. On the escarpment of dam 1 (Fig. 1), preparation 2 is arranged in the form of gravel dumping with a thickness of 20-30 cm, which is then carefully planned. An anti-suffusion device 3 is laid on the preparation, as of which geotextiles are currently usually used. The anti-suffusion device 3 is necessary in order to prevent mechanical suffusion, from under the flexible sloping fastening. On top of the anti-suffusion device 3, a flexible slant mount 4 of plates 6 (Fig. 2) is mounted with a flexible “apron” 5 device. To protect the base of the slope mount 3 of the dam from being washed out, a flexible “apron” 5 is attached that attaches to it. Flexible "apron" 5 (figure 3) is assembled by putting on metal rods 7 of prefabricated beams 8 having through holes. The number of through holes should be at least two. Between the beams 8 during the assembly of the flexible “apron” 5, soft washers 9 are put on between them to give increased flexibility when washing and lowering. The metal rods 7 are attached to the base of the sloping mount 4. At the end of the metal rods 7, after assembly of the flexible “apron” 5, fixing bolts 10 are provided that tighten the structure. At the same time, all protection against washing away the base of the dam mounting is collected by autonomous connection of such flexible “aprons” 5 along the entire length.

The length of the flexible “apron” 5 depends on the morphological and hydraulic conditions of the river and can be determined by known methods.

The proposed method of erecting protection from undermining the foundations of shore protection structures is cheaper and more reliable in the work of known similar technical solutions. At the same time, the durability of these structures is 1.5-2 times greater, since the hanged flexibility of the “apron” design is provided.

Information sources

1. Patent of the Russian Federation No. 2238368, MKI E02D 17/20, EV 3/12. The method of erection of a flexible sloping mount. / Lamerdonov Z.G .; Application 03/31/2003; publ. 10/20/2004, Bull. No. 29 (analog).

21. Patent of the Russian Federation No. 2278920, MKI E02D 17/20, EV 3/12. The method of erection of a flexible sloping mount. Lamerdonov Z.G .; Application 12/06/2004; publ. 06/26/2006, Bull. No. 18 (prototype).

Claims (1)

A method of erecting protection from undermining the foundations of shore protection structures, including laying plates on a slope and attaching a flexible apron to the sloping fastener, characterized in that the flexible apron is assembled from individual beams with through holes by putting the beams on metal rods with soft washer gaskets between the beams and fixing at the end metal rods with clamping bolts, while the metal rods are attached to the slant mount.

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