RU2285082C1 - Flexible retaining wall - Google Patents

Abstract

FIELD: hydraulic and reclamation construction, particularly bank consolidation structures to protect river banks, dam slopes and other structures.

SUBSTANCE: flexible retaining wall has prismatic structure and includes stone, net and trusses of stable triangular shape. Flexible retaining wall cross-section defines triangular trusses composed of spacing members. Each spacing member is formed of protective concrete in which wire is embedded. The spacing members are united in triangle assemblies by twisting spacing member wire ends around transversal reinforcement bars so that triangular prism nodes are created. Triangular prism is provided with one reinforced concrete face formed of net and concrete and located from upstream prism side. Triangular prism interior is filled with stone. The triangular prism is laid in longitudinal river direction and abut river bottom by one face thereof. Upper wall slope may be vertical or extend at an angle to horizon line. Flexible apron is pivotally connected to the wall in upper pool.

EFFECT: increased efficiency and reliability of river bank protection against erosion and extended service life of the structure.

4 cl, 4 dwg

Description

The invention relates to hydraulic engineering and land reclamation construction and can be used as shore protection structures in eroded riverbeds, canals, slopes of dams, designed for various purposes, and other structures.

A device for attaching a slope of an earth structure [1] is known, comprising a synthetic filter coating laid on the slopes, retaining elements and a layer of stone outline. The holding elements are made in the form of crossbars, racks with hinges, ropes, mesh and limiters. The stone sketch is made in the form of gravel. The lower ends of the uprights are pivotally attached to the crossbar, and their upper ends to the rope. A mesh is attached to the rope. One of the ends of the rope is attached to the crossbar, and their other free ends are tensioned due to the application of force, and the racks and crossbars are connected by K-stops. Between the coating and the mesh, a layer of stone is laid. A layer of gravel protects the coating from dynamic wave action. In turn, it is reliably protected by a mesh held in place by ropes. The disadvantages of this technical solution are as follows:

- the mount is directly in contact with the fluid flow and entrained sediments and therefore can undergo rapid attrition and destruction in a short time;

- the design is a rather complicated technical solution, which makes it unreliable in operation and expensive in cost;

- the efficiency of fastening is significantly reduced when there are large fluctuations in the water level, fluctuations in speed and flow rate in the river or canal;

- this technical solution is not effective for use in cases where the local building material is trees or shrubs.

The closest technical solution is a flexible retaining wall [2], mounted on a planned surface, which is filled with stone in equal layers. The disadvantages of this technical solution are:

- the rigidity of the gabion structure is insufficient, since there is no connection between the layers inside the gabion and between the gabions;

- the shape of the gabion frame is variable;

- bearing capacity for bending and shear of such a structure is quite low;

- in economic terms, it is not a favorable technical solution.

The purpose of the invention is to increase the efficiency and reliability of protecting the banks of riverbeds from erosion and durability of the life of the shore protection structure.

This goal is achieved by the fact that on the eroded shore a flexible retaining wall is installed (Fig. 1). Moreover, its height depends on the morphological elements of the stream and channel. A flexible retaining wall (figure 2) is assembled mechanically, by twisting the wire ends, spacers, around the reinforcement, which form the nodes of the triangular prism. So, by sequentially connecting the spacer elements to the reinforcement, the height of the flexible retaining wall can be increased to any size. In this case, the cross section of this structure, which is a farm, will be triangular. The truss system outside, on the pressure side, is wrapped with a net, and then concreted.

The spacer element consists of protective concrete in which the wire is located. A wire rod with a diameter of 5-6 mm can be used as wire. As reinforcement - steel A 111 with a diameter of 12-16 mm. High-strength concrete M 250-300 can be used as aggregate. The wire ends of the spacer elements (Fig.1,2) to strengthen the mechanical fastening to the reinforcement are connected with special devices. The inner space of the flexible retaining wall is filled with stone (figure 2). A triangular prism is laid along the river, one plane on the bottom of the river.

The flow of water, flowing along the flexible retaining wall, is washed away by a flexible “apron”, which, when washed, is lowered and is a reliable protection against washing out of the flexible retaining wall.

A flexible “apron” is pivotally connected to a flexible retaining wall and is made by laying the net by unwinding the rolls transversely to the direction of flow and connecting the rolls together by a strapping wire. After that, the formed carpet from the grid is covered with concrete 10-20 cm thick.

Figure 1 shows a longitudinal section of a flexible retaining wall with a vertical wall; figure 2 is a longitudinal section of a flexible retaining wall with an inclined wall; figure 3 - node a in figure 2; figure 4 - spacer element, a perspective view.

On the washable shore 1, a flexible retaining wall 2 is installed, consisting of spacer elements 3. The spacer element 3 consists of protective concrete 4, in which there is a wire 5. The wire ends 6 of the spacer elements 3 are mechanically attached to the reinforcement 7. The inner space is filled with stone 8, and on the pressure side, the flexible support of the wall 2 has an reinforced concrete coating 9 consisting of a mesh 10 and concrete 11. To prevent the wall from being washed out, a flexible “apron” 12 is provided.

Flexible retaining wall is constructed and operates as follows. On eroded shore 1 is installed prefabricated flexible retaining wall 2 (figure 1). Moreover, its height depends on the morphological elements of the stream and channel. Flexible retaining wall 2 (Fig.2) is assembled mechanically by twisting the wire ends 6, spacer elements 3, around the reinforcement 7, which form the nodes. The spacer element 3 consists of protective concrete 4, in which there is a wire 5. The wire ends 6 of the spacer elements 3 (Fig.1,2) are connected by special devices to strengthen the mechanical fastening to the reinforcement 7. So, sequentially connecting the spacer elements 3 to the reinforcement 7, the height of the flexible retaining wall 2 can be increased to any size. In this case, the cross-section is a triangular-shaped truss with a vertical or inclined reinforced concrete coating 9. The reinforced concrete fastening is made by concreting the mesh 10 with concrete 11. The inner space of the flexible retaining wall 2 is filled with stone 8 (Fig. 2). A triangular prism is laid along the river, one plane on the bottom of the river.

On the front side of the flexible retaining wall 2, a flexible “apron” 12 is provided, which is hinged to it. The length of the flexible “apron” 12 is determined by the developed methodological recommendations.

The flow of water flowing along the flexible retaining wall 2, can wash out a flexible "apron", which, falling down, will be a reliable protection against washing. Structurally flexible "apron" consists of a grid 10 and concrete 11.

Flexibility is a huge advantage of this structure, since it is located in water, and it is impossible to avoid deformations of the bottom and base, and this will entail deformation of the structure, which is not dangerous for this type of coastal protection.

The proposed technical solution has several advantages over others previously known. In the proposed technical solution, you can use local building material, which is the cheapest and most affordable.

The proposed technical solution is cheaper than the known ones due to the use of local building material. Moreover, the durability of these structures is greater than previously known similar technical solutions.

In environmental terms, this is the most favorable solution to the problem of protecting coasts from erosion.

Information sources

1. A.c. 1461821 USSR, MKI E 02 D 17/20 Device for securing the slope of an earth structure. / Shkundin B.M. and Novozhilov A.P. (THE USSR); Application 03/04/87; publ. 02/28/89, Bull. No. 8 (Analog).

2. RF patent №2211287 C2, IPC E 02 D 29/02 publ. 08/27/2003 (prototype).

Claims (4)

1. A flexible retaining wall, which is a prismatic structure containing stones, a mesh and fixed triangular trusses, characterized in that the cross sections of the flexible retaining wall are triangular trusses assembled from spacers consisting of protective concrete in which the wire is located, in triangles by twisting the wire ends of the spacer elements around the transverse reinforcement with the formation of nodes of a triangular prism, and the outside of the pressure side of the triangular prism has one reinforced concrete flat face, consisting of mesh and concrete, and the inner space of the triangular prism is filled with stone, while the triangular prism is laid along the river with one plane on the bottom of the river. 2. The wall according to claim 1, characterized in that its uphill slope is vertical. 3. The wall according to claim 1, characterized in that its uphill slope is inclined to the horizon. 4. The wall according to claim 1, characterized in that in the upper pool a flexible apron is pivotally attached to it.

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