RU2717536C1 - Geogrid - Google Patents

Abstract

FIELD: construction.SUBSTANCE: invention relates to construction, namely for protection of soil from washing by surface waterways on slopes of embankments of industrial sites and motor roads, slopes, coastal sections of water obstacles, routes of underground pipelines. Geogrid is made in form of cellular structure, comprises bottom part, includes separately made cells from rigid polymer material, containing fastening holes, movably connected by ropes, to compensate for occurrence of longitudinal deformations, and seams, damping pads, to compensate transverse deformations of geogrid cells.EFFECT: technical result consists in increase of deformation of geogrid web due to mobility of connection of geogrid cells with each other and providing possibility of compensation of longitudinal and transverse deformations of the geogrid web, repeating the configuration of the upsetting soil base, with preservation of geometrical shape of cells, without spilling out and flushing of the aggregate of cells of the geocell.1 cl, 6 dwg

Description

The invention relates to the field of construction and can be used to strengthen the soil surface from erosion by surface streams on the slopes of embankments of industrial sites and roads, slopes, coastal sections of water barriers, underground pipelines.

Known lattice with a cellular structure for strengthening the soil surface [RF patent No. 2136817, E02D 17/20, publ. 09/10/1999], made of polymer perforated strips installed on the ribs and connected to each other in a checkerboard pattern with welded seams with the formation in an extended position on the prepared soil surface of the cellular structure. Also known geokarkas [RF patent No. 2221110, E02D 17/18, publ. 01/10/2004, bull. No. 1], made of flexible polymer tapes mounted on the ribs and interconnected by linear welds when compressing the tapes with two clamps with the formation in the weld zones of the recesses from the protrusions of one of the clamps.

The disadvantage of analogues is the lack of reliability of strengthening the soil surface in the conditions of local sedimentation of the soil base due to a violation of the geometric shape, crushing of the cell walls or complete destruction of the geogrid web caused by rigid fastening by welding of the geogrid cells in places of longitudinal or transverse bending of the geogrid due to subsidence and deformation of the soil base .

A device is known for fixing soil of the surface slope layer [RF patent No. 2358063, B02D 17/20, publ. 06/10/2009, bull. No. 16], made in the form of a volumetric geogrid formed from separate, anchored rods, sections whose cells are filled with filler, and through each of which are passed polymer or metal cables arranged in rows in the direction of incline of the slope. One or more cables of each section of the geogrid, having a length exceeding the length of the geogrid in the direction of fall of the slope, are fixed on the horizontal surface of the soil at the top, and at the base of the slope using additional anchor rods or buried concrete structures.

The disadvantage of the analogue is the lack of reliability of strengthening the soil surface in the event of sedimentation and deformation of the soil base, leaching of soil from under the geogrid, causing the geogrid web to hang out on cables, rashing and leaching of the geogrid aggregate, deformation of the geogrid cells. These processes are due to the increased structural rigidity of the geogrid web caused by the rigid fastening of the geogrid cells between each other by welds and stretched cables passing through the cells, which do not allow to compensate for longitudinal and transverse deformations of the geogrid web.

The closest in technical essence to the claimed device is a geobox [utility model of the Russian Federation No. 179112, E02D 17/20, publ. 04/26/2018, bull. No. 12], containing tapes made of synthetic polymeric material, interconnected with a sewing seam to form rectangular cells, equipped with loops in the upper part, for temporary fastening to the device for tensioning the ribbons when filling the cells, in the lower part with the bottom, additionally reinforced passing through the edges cells with a polyester sling passing into fixing loops attached to the device for tensioning tapes.

The disadvantages of the known device are:

1) The design of the geobox made in the form of a cellular structure of polymer tapes sewn with vertical and horizontal seams does not have sufficient reliability of strengthening the soil surface under conditions of local settlement of the soil base, since it does not allow to compensate for longitudinal and transverse deformations due to the motionless fastening of individual boxes (cells) ) between themselves by vertical seams. During the settlement or removal of soil at the base of the geobox, the filled geobox filled with compacted filler will be locally deformed, while at the places of the bend of the structure, the walls of individual boxes (cells) will crumble and deform, with the filler spilling out and carrying out with a surface water flow.

2) The design of the geobox when it is damaged is not maintainable. Due to the low stiffness on the crushing of the geobox forming tapes, with partial removal of the filling cell of the filler, for example, with a temporary surface water stream, the structure cannot be re-filled with soil, that is, in fact, it is a disposable product. Repair will consist in removing the damaged structure, leveling the soil foundation, reinstalling the geobox.

3) The design of the geobox is time-consuming to install and requires the use of auxiliary devices (a rigid metal frame), its transportation, installation of mounting equipment, fixing the geobox to the mounting equipment, layer-by-layer soil compaction in each cell of the geobox attached to the mounting equipment, dismantling of auxiliary equipment.

The objective of the invention is to provide a device that increases the reliability of strengthening the soil surface in the conditions of local sediments and deformations of the soil base.

The technical result of the invention is to increase the deformability of the geogrid web due to the mobility of connecting the geogrid cells to each other and to provide the possibility of compensating for longitudinal and transverse deformations of the geogrid web, repeating the configuration of the deposited soil base, preserving the geometric shape of the cells, without spilling out and washing out the filler of the geogrid cells.

The task in the geogrid, made in the form of a cellular structure containing the bottom, is solved by the fact that separately made cells of rigid polymeric material containing mounting holes are movably connected by cables to compensate for longitudinal deformations, and by seams, damping overlays, to compensate transverse deformations of geogrid cells.

The invention is illustrated in FIG. 1-6. In FIG. 1 shows a fragment of a geogrid laid on a slope. In FIG. Figure 2 shows the order of connecting the cells of the geogrid (front view). In FIG. 3 shows a geogrid cell. In FIG. 4 shows the displacement of the cells of the geogrid during the settlement of the soil base (front view). In FIG. 5 shows the compression of the geogrid cells to the transport position. In FIG. 6 shows the geogrid fixing on a slope.

The geogrid has the following construction:

The geogrid is formed of cells 1 (Fig. 1), made in the form of boxes open in the upper part, movably connected to each other using cables 2, oriented across the slope 3, as well as damping plates 4 (Fig. 2) and seams 5. Each cell 1 contains side walls 6 made of rigid polymeric material (Fig. 3), with fixing holes 7 for conducting cables 2, as well as end walls 8, the bottom part 9 and the partition 10 made of polymer material, folding in the transport position.

Damping pads 4 (FIG. 2) made of polymeric material and seams 5 connecting the cells 1 arranged in a row (FIG. 1) are located in the upper or lower part of the side walls 6 (FIG. 3) of adjacent cells 1 (FIG. 1) with sequential alternation of the location, that is, if on one side wall 6 (Fig. 3) of the cell 1 (Fig. 1) the damping pad 4 (Fig. 2) and the seam 5 are located on top, then on the opposite side wall 6 (Fig. 3) the damping pad 4 (Fig. 2) and the seam 5 should be located below and vice versa.

To fill the cells of the laid geogrid, soil or gravel is used (not shown in Fig.).

To ensure the flow of surface water, the end walls 8, the bottom 9 and the partition 10 contain drainage holes (not shown in Fig.).

When uneven settlement of the soil base 11 (Fig. 4) filled with filler (not shown in Fig.) Cells 1 are deposited by gravity, repeating the changing shape of the surface of the soil base 11. In this case, the cable 2, passed through the mounting holes 7 of the cell 1, forming a movable node, allows you to compensate for the longitudinal deformation of cell 1, while the damping pads 4 and seams 5 (Fig. 2) provide compensation for transverse deformations of cell 1, with a smooth repetition of the profile of the deforming soil base 11 (f of 4).

In the transport position, the combined cells 1 (Fig. 5) are compressed in the direction 12, while the end walls 8 (Fig. 3), the bottom part 9 and the partition 10 are bent in the central parts, are folded into the plane of the side walls 6.

During installation, the cells connected in a row 1 (Fig. 6) are stretched across the direction of incidence of the slope 3 (Fig. 1), connected to the cells 1 located higher or lower in a row using the cables 2, fixed to the surface of the slope by standard methods, after which fill cells 1 with filler (not shown in FIG.).

Example:

It is necessary to carry out engineering protection of the slope of the embankment of the industrial site, made of clay soil.

Level the surface of the slope. On the prepared surface sequentially, from bottom to top, stacked in the factory in a row of cells 1 (Fig. 1). Cells 1 of each subsequent row are connected to cells 1 of the previous row using a polymer cable 2, passing it through the mounting holes 7 (Fig. 3).

The geogrid is fixed using steel L-shaped anchors 13 (Fig. 6), which ensure that the polymer wire ropes 2 connecting the cells 1 (Fig. 1) are pressed to the slope surface 3. The end parts of the polymer ropes to the right and left of the geogrid are tied to the buried L-shaped anchors .

The geogrid cells are filled with gravel.

Reliability of the geogrid is ensured by movably connected separate cells that protect the standard rigidly bonded geogrid cells from losing their geometric shape, and as a result of functional purpose, or complete destruction in the process of deformation of the soil base.

Compensation of the longitudinal and transverse deformations of the geogrid cells is achieved due to the movable joints formed by the mounting holes and the cable, to reduce longitudinal deformations, and seams, damping overlays, to reduce the transverse deformations of the geogrid cells.

Claims (1)

A geogrid made in the form of a cellular structure containing a bottom part, characterized in that the separately made cells of rigid polymeric material containing mounting holes are movably connected by cables to compensate for longitudinal deformations, and by seams damping overlays to compensate for transverse deformations of geogrid cells .

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