RU2819028C1 - Geogrid for reinforcement of slopes and slopes - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and is intended for fixing the soil of the slopes of coastal lines and canal beds, during the construction of road pavements, during the reinforcement of slopes, in the transport, hydrotechnical branches of construction, where high and stable indicators of strength and durability of erected structures are required. Geogrid for reinforcement of slopes and slopes is made of flexible polymer strips, which are made of polyethylene and connected to each other by welded seams in staggered order, and seams are located vertically relative to ribs of strips. Strips are rectangular and are connected with an offset during welding relative to each other by a value which depends on the angle of inclination of the slope, as well as the pitch of the geogrid — the length of the cell. Between strips in place of welding there are connecting plates with length equal to width of strip plus double value of strips displacement relative to each other. Plates are made of high-pressure polyethylene, and strips are made of low-pressure polyethylene.

EFFECT: providing connection of strips with offset during welding relative to each other by value depending on slope inclination angle, increased strength of weld joint due to increased length of welded seam, provision of stability of geometrical parameters of strip and geogrid design.

1 cl, 3 dwg

Description

The invention relates to the field of construction. The geogrid is designed to stabilize the soil of slopes of coastlines and canal beds. The proposed geogrid can be used in the construction of road pavements and for strengthening slopes. And also in many other applications in the transport and hydraulic engineering sectors of construction, where high and stable indicators of strength and durability of the structures being built are required.

Various devices are known from the prior art (patent RU 2358063, published on June 10, 2009 and patent RU 2152480, published on July 10, 2000), in which spatially polymer gratings, in particular so-called “geogrids,” are used to secure the surface layer of the slope.

Geogrids are made from flexible and durable polymer tapes, cutting the tapes into measured strips and fastening them together in a checkerboard pattern with transverse seams, cellular structures are obtained that are capable of securing and keeping the soil masses loaded into the cells from shifting.

The material for the manufacture of these tapes, as a rule, is polyethylene of various grades. Polyethylene strips are flexible, durable, and resistant to adverse natural factors.

Known devices have a limited service life due to the instability of the behavior of a cellular structure made of polymer material after filling it with plant soil or concrete mortar due to the insufficient rigidity of the structural elements of the cell, namely the seam connecting the strips to each other and the strips in height. The deformation of cells is due to the heterogeneous influence of the filled material on its structural elements, as well as the external environment: the movement of rainwater, snow, etc.

When placed on slopes or slopes, geogrids of this type reduce their strength compared to the horizontal arrangement of the same geogrids, due to an increase in tensile strength.

The problem to be solved by the present invention is to increase the rigidity of the cell and the strength of the seams connecting the strips to each other. To uniformly distribute loads on the structural elements of each cell and redistribute these loads to nearby structural elements of neighboring cells. Increasing the service life of the cellular structure, increasing its load-bearing capacity of strengthened soil surfaces due to the possibility of vertical placement of the reinforced geogrid weld. Ensuring a geogrid cell shape that is stable in time and space for strengthening slopes and slopes.

The closest in technical essence to the proposed invention is a geogrid for strengthening slopes and slopes (see patent RU 2689962, published on May 29, 2019). A lattice with a cellular structure for stabilizing and securing the ground surface, made of flexible zigzag polymer strips. In this case, the odd stripes are connected to the even stripes, rotated 180° relative to the odd stripes. The connection of the strips is carried out along vertical lines passing through the peaks of the zigzags, and the connection lines occupy a vertical position in the expanded form of the geogrid.

However, the resulting effect is achieved by complicating the manufacture of geogrid strips. Also, this type of geogrid is difficult to transport, since a block of strips is a roll of significant diameter, which undoubtedly is inferior to a block with rectangular strips. When placing such a geogrid, it is necessary to unroll the roll on a slope, and then bring the geogrid from a horizontal to a vertical position perpendicular to the slope or slope.

The claimed invention is aimed at eliminating these disadvantages of this type of geogrid, as well as solving the problem of increasing the strength and stability of geogrid geometric parameters when operating on slopes and slopes.

The technical result of the invention consists in connecting rectangular strips with a welding offset relative to each other by an amount depending on the slope angle. Connecting plates with a length equal to the width of the strip plus twice the offset of the strips are installed between the strips to increase the strength of the weld by increasing the length of the weld. The plates are made of high-density polyethylene, and the strips are made of low-density polyethylene, which also increases the strength of the connection.

Another technical result of the invention is to ensure stability of the geometric parameters of the strip and geogrid design. This is achieved by reducing the specific load on the geogrid surface by increasing its area with the same amount of soil in the geogrid cells, and therefore the same force.

In addition, the claimed geogrid, despite its simplicity, opens up the possibility of its use in new areas that require increased strength and stability of structures, for example, in slopes of railway embankments, as well as directly under railway and highway beds during long ascents and descents. To achieve the specified technical result, a spatially polymeric lattice is proposed.

Figure 1 shows an axonometric diagram of a geogrid on a slope or slope.

Figure 2 shows a drawing of the geogrid (main view and top view).

Figure 3 shows a section A-A of the geogrid.

Geogrid strips are produced by cutting out a low-density polyethylene film from a web. Strips 1 (Fig. 1) are welded with plate 2 to each other, forming a welding unit.

In the main view and top view (Fig. 2) - L _I and N _I are the length and pitch of the cell, and N _PL , S _PL are the width and thickness of the plate.

In section AA (Fig. 3) - L _PL , N _PL , S _PL - strip width, plate length and offset of the strips relative to each other.

Empirically, a relationship has been established between the length (pitch) of the cell L _i (H _i ) and the displacement of the strips relative to each other C _p of the geogrid, depending on the slope angle (X).

The connection of the strips into a geogrid web (Fig. 3) is carried out by welding along the entire width of the strip (L _I ) and the length of the plate (L _PL ).

The advantage of the claimed geogrid is the simplification of its manufacture, transportation and placement on slopes or slopes. Obtaining a geogrid of this type of practically unlimited length on slopes and slopes determines the achievement of the technical result of the claimed invention. An increase in the strength of the geogrid is also ensured by the use of a plate at the welding site by increasing the length of the weld. All this leads to stability of the geometric parameters of the geogrid design, as well as an increase in the bearing capacity of the strengthened soils.

Claims (1)

Geogrid for strengthening slopes and slopes, made of flexible polymer strips, which are made of polyethylene and interconnected by welded seams in a checkerboard pattern, and the seams are located vertically in relation to the edges of the strips, characterized in that the strips are made rectangular and connected with an offset during welding relative to each other by an amount depending on the angle of inclination of the slope, as well as the pitch of the geogrid - the length of the cell, while connecting plates with a length equal to the width of the strip plus double the offset of the strips relative to each other are installed between the strips at the welding site, and the plates are made of high-quality polyethylene pressure, and the strips are made of low-density polyethylene.