Method of reinforcing a weak base soil and slopes (options) and geogrid for its implementation

 

The invention relates to the construction and used for the construction of pipelines on the slopes, the construction of FOCL passages of pipelines during construction of roads and waterworks. Placed on the soil geogrid having a honeycomb structure and is made of bonded together in a checkerboard pattern connecting seams of the set of flexible bands. Fix it on the ground with tension and filling its cells loose material. Strips of geogrid is made of soft ruanruan materials and cell geocells have the shape of a hexagon, which binds the seams are performed paired - dual and Ravnopravie material tapes, with the distance between double stitches, not to exceed half of the distance between the inner seams pairs of seams forming cells of the geogrid. Slopes with a slope greater than 45 degrees, strengthen the walls of a set of horizontal geogrid. Strengthening start from the base of the slope and each subsequent layer is placed offset to the side of a slope with partial cutting in the slope of the adjacent cells of the geogrid. Prevents erosion of the soil. 3 S. and 9 C.p. f-crystals, 5 Il.

Sobratyami passages pipelines, in the construction of roads and hydrotechnical structures, where required to ensure soil stability. The prior art method of stabilizing the soil against erosion, which consists in spraying the soil water dispersion of water-insoluble polyvinyl compound. The soil is formed of a monolithic film, which prevents destruction of the surface layer of the soil (see DE 1290007, 27.02.1969). There is a method of protection of soil from erosion is applicable to agricultural land and is not effective for soils with the presence of vegetation.

It is known that the slopes of trenches, grooves are prone to landslides, especially in the process of penetration grooves and within two years after the completion of the work. So we know that trenches, pits, structures, embedded in loose soils and weathered bedrock at a depth of 1.25 m, must have slopes or mount in accordance with the nature of the bedrock, the conditions of their occurrence and hydrogeological conditions, it is necessary to ensure the stability of slopes within the designated project period. A significant risk for pipelines crossing ravines and river beds, are landslides banks, exposing the pipeline and increasing the span, which may Pref is poison coast of the Gulf of Aden at the site of passage of the oil pipeline on slightly sloping and inclined stony desert and the intersection is lined Wadi bed was provided for the filling of the target transition rocky soil using geotextile material, and protection of the pipeline through temporary watercourses was carried out by gabion-containers of metal mesh, filled with fragments of rock.

Thus, it is known that, for example, depending on the type of the watercourses crossed by the pipeline route, you must use a different anti-erosion measures. One such activity is the use of geotechnical arrays for ground reinforcement.

Known lattice textile mats, designed to protect susceptible to erosion of soil layers, in particular of slopes, dams and artificial embankments (see DE 4017710, 26.09.1991). Lattice Mat is made in the form of a grid of prosobranch textile structures, forming a shaped body of chambers filled bulk soil. However, the known technical solution is aimed at ensuring the connection of the outer contours of the individual lattice mats flush with the formation of evenly spaced viemo hanicheskih fabrics for surface protection of slopes against erosion, blow, to increase the bearing capacity of soils, as these materials have high tensile strength and good permeability. Technical fabrics provide uniform distribution of loads on the soil and improve drainage. Technical fabrics are knitted, cotton canvas and other natural and synthetic materials used in the construction business for technical purposes (see REUTERS F. and others “Engineering Geology”, Moscow, “Nedra”, 1983, pp. 391-392, 417-418).

Known reinforcing the case for bulk and packaged materials used for strengthening earthworks, coasts, sea, snow arrays, etc., having a cellular structure consisting of separate or lattice prosobranch elements with projections or spikes in the connective joints and intended for fastening the device to the ground surface (see DT 3909189, 02.11.1989). The known device is resource-demanding, difficult to manufacture and operate.

The prior art made of textile tapes grid, the walls of which are formed flounces, the resulting compounds tapes seams (see WO 97/16604 A1, 09.05.1997). The known device does not have the necessary procrastinate geometrically homogeneous structure.

Known geotechnical grille (geogrid) three-dimensional mesh structure that is used to strengthen the walls, reinforcing weak bases in transport, hydraulic engineering and other construction industries. The geogrid is manufactured from polyethylene tapes by linear welding seams arranged in a checkerboard pattern perpendicular to the base of the geogrid (see THE 2246-002-07859300-97 “PRUDON-494”, Geotechnica grille plastic). This solution is the closest to the claimed group of inventions and taken as a prototype.

One of the disadvantages of the known solutions is not sufficient transverse rigidity of the lattice, due to the high deformability, polyethylene tapes, warping their edges. In the known solution no ravnopravnosti welds and plastic tapes. When welding works there is a danger of embrittlement of the weld, tape, and the danger of burn-through.

In addition, the production of geogrids by welding made of polyethylene tapes associated with harmful discharge into the air of the working zone of the volatile products thermo-oxidative degradation, requires the organization of General ventilation and local you who adimy serious fire safety measures. Given that the polyethylene sensitive to solar radiation and exposure of the geogrid, for example, on the slope will lead to rapid aging and destruction.

From all this it follows that there is the task of creating this design of geogrid that she possessed the necessary mechanical strength, chemical resistance, and its production does not require special sanitarno hygiene and fire safety measures.

This task is solved in that in the method for reinforcing a weak base soil and slopes, which consists in laying on the ground having a honeycomb structure and is made of bonded together in a checkerboard pattern connecting seams of the set of flexible bands of the geogrid with its tension computational effort and attaching on the ground followed by filling in the cells of the geogrid bulk material, strips of geogrid is made of soft ruanruan materials and cell geocells have the shape of a hexagon, which binds the seams are performed paired - dual and Ravnopravie material tapes, with the distance between double stitches, not to exceed half of the distance between the inner seams pairs of seams, forming a cell of the geogrid, the surface sslonly permeable technical fabric. In the particular case of the complete method to prevent leaching of granular material from the cells of the geogrid on the slopes of the ratio of the height of the cell of the geogrid to its coinciding with the direction of the slope of the diagonal is not less than the tangent of the angle of the strengthening of the slope.

When the slope of the strengthening of the slope up to 30 degrees as soft ruanruan material use technical fabric, and with the steepness reinforcing a slope of more than 30 degrees as soft ruanruan material used polymer-fabric material.

A variant of the claimed invention is a method for reinforcing a weak base soil and slopes, which consists in laying on the ground having a honeycomb structure and is made of bonded together in a checkerboard pattern connecting seams of the set of flexible bands of the geogrid with its tension computational effort and attaching on the ground followed by filling in the cells of the geogrid bulk material, which on the slopes with a slope greater than 45 degrees, the strengthening of the slope is realized by the walls of a set of horizontal geogrid, strengthening start from the base of the slope and each subsequent layer is placed offset in the direction of the slope, while Sergei is than strips of geogrid is made of soft ruanruan materials, and cell geocells have the shape of a hexagon crimping seams are performed paired - dual and Ravnopravie material tapes, with the distance between double stitches, not to exceed half of the distance between the inner seams pairs of seams forming cells of the geogrid.

At the height of a slope of more than 2 m wall of the geogrid every 1.6 to 2 m in height cut in strengthening the slope to a depth of 200-400 mm and fix it. As soft ruanruan material use technical fabric or polymeric fabric material.

In addition, the task is solved in that the geogrid provides a set of flexible webs, bonded arranged in a checkerboard pattern perpendicular to the long sides of the flexible tape the seams with education fillable elevated ground cellular structure when laying flexible set of tapes of their long edges to reinforce the soil and the application of the calculated transverse and longitudinal tensile force to the extreme tape with subsequent fixation on the ground of cells on the perimeter of the sprawling set of flexible tapes, and to increase the stability, strength and lateral stiffness of the geogrid flexible tape made of soft ruanruan materials, cell geocells have the form of smido double seams, not exceeding half of the distance between the inner seams pairs of seams forming cells of the geogrid.

In the particular case of execution of the geogrid external tape in the set of flexible bands made dual or from a material with higher mechanical properties and light fastness. The ratio of the height of the cell to its coinciding with the direction of the slope diagonal not exceed the tangent strengthen the slope of the ground.

The invention is illustrated by the graphic material, where Fig.1 shows the geogrid in the original position - package-stitched ribbon; Fig.2 - geogrid laid on the ground in the workplace (extended) position; Fig.3 is a wiring diagram of the tapes of the geogrid, top view; Fig.4 is an example of the use of geocells on a steep slope; Fig.5 - scheme of calculation of the relationship of cell size of the geogrid.

Flexible tape 1 of soft ruanruan material in a checkerboard pattern bonded transverse double seams 2 and 3, which are made perpendicular to the long sides of the strips with their longitudinal edges 4. As ruanruan material is technical fabric, suitable for soil stabilization on slopes up to 30 degrees, which is used for ballasting underground Truboprovod>

These fabrics are high-strength, durable when used in the ground and in the air, well stitched together in small seams on industrial sewing machines. The binding tapes provide high-strength threads. Geogrid folded is a block of rectangular shape. The folded state of the geogrid is characterized by the absence of clearances (gaps) between its adjacent edges. Before fixing the geogrid on the ground of the latter can be condensed passes caterpillar machine. The surface of the strengthened soil prone to water erosion, may be to consolidate the geogrid is lined with non-woven synthetic material (NCM) or more durable and less deformation technical fabric, which protects the soil from erosion and, being permeable, does not violate the hydrological regime of the area. Low deformability, technical fabric provides a stable position of the blocks of the geogrid on the slope. High mechanical tensile strength technical fabric allows her to perceive the weight of geogrids on the slopes of the great length of relieving the load from the pin fastening and releasing the blocks of the geogrid to the weight of the neighboring blocks.

When expanded, the unit geogrid is their geogrid is characterized by the hexagonal shape of its cells. The stiffness of the geogrid in the working position is provided by the pair of suture - doubling tape 1 when performing double seams 2 and 3, the distance between which is less than half the distance between the inner seams 5, 6 adjacent pairs of seam binding ribbon and forming a cell of the geogrid. Stretched position of the geogrid provide application estimated not to exceed the limit of the tensile strength of the strips or seams on resdir, transverse and longitudinal efforts to extreme tapes 7, 8 block of the geogrid. Pinning her on the ground make the pins 9. Cell geocells filled bulk soil, such as draining material - gravel, after which the pin 9 is removed and used for mounting on the ground next block of the geogrid. The ratio of the height of the cell to its coinciding with the direction of the slope of the diagonal must not exceed the tangent strengthening of repose of the soil. If the violation of this ratio possible exposure strengthening of the slope according to Fig.5.

When using the MNC or technical fabric pins hammer into the ground through the cloth lining material. For damping the flow of water under the geogrid in the case of the MNC lower on the slope of the edges of the panels of the MNC should have a 45 deg is the following.

The strengthening of the slope starts from the foot of the slope on which to place the lower geogrid 10 (see Fig.4). Adjacent to the slope of the cell is partially cut in the slope and fix with pins. The geogrid fill drainage material, after which it offset to the side of a slope, place the following geogrid, fix it to the slope, and cells of the geogrid also complete draining material. At the height of a slope of more than 2 m and the steepness of the slope more than 45 degrees to the wall of the geogrid every 1.6 to 2 m in height cut in strengthening the slope to a depth of 200-400 mm and fix it with the purpose of unloading the geogrid and transfer of weight draining material on the soil of the slope.

Claims

1. Method of reinforcing a weak base soil and slopes, which consists in laying on the ground having a honeycomb structure and is made of bonded together in a checkerboard pattern connecting seams of the set of flexible bands of the geogrid with its tensioning and attaching on the ground followed by filling its cells granular material, wherein the strip of geogrid is made of soft ruanruan materials and cell geocells have the shape of a hexagon, which binds the seams made Paine distance between the inner seams pairs of seams, forming a cell of the geogrid.

2. The method according to p. 1, characterized in that the surface is prone to water erosion strengthening of pre-ground and line it with non-woven synthetic material (NCM) or permeable technical cloth.

3. The method according to p. 1, characterized in that in order to prevent leaching of granular material from the cells of the geogrid, the ratio of the height of the cell of the geogrid to its coinciding with the direction of the slope of the diagonal is not less than the tangent of the angle of the strengthening of the slope.

4. The method according to p. 1, characterized in that the steepness of the strengthening of the slope up to 30as soft ruanruan material use technical fabric.

5. The method according to p. 1, characterized in that the steepness of reinforcing a slope of more than 30as soft ruanruan material used polymer-fabric material.

6. Method of reinforcing a weak base soil and slopes, which consists in laying on the ground having a honeycomb structure and is made of bonded together in a checkerboard pattern connecting seams of the set of flexible bands of the geogrid with its tensioning and attaching on the ground, followed by filling its cells loose Mat is and carry out the walls of a set of horizontal geogrid, however, a stronger start from the base of the slope and each subsequent layer is placed offset in the direction of the slope, and the geogrid is placed with partial cutting in the slope of the adjacent cells of the geogrid, the strips which are made out of soft ruanruan materials, and its cells have the shape of a hexagon, which binds the seams are performed paired - dual and Ravnopravie material tape with the distance between double stitches, not to exceed half of the distance between the inner seams pairs of seams forming cells of the geogrid.

7. The method according to p. 6, characterized in that the height of a slope of more than 2 m wall of the geogrid every 1.6 to 2 m in height cut in strengthening the slope to a depth of 200-400 mm and fix it.

8. The method according to p. 6, characterized in that as a mild ruanruan material use technical fabric or polymeric fabric material.

9. Geogrid, containing a set of flexible webs, bonded arranged in a checkerboard pattern, perpendicular to the long sides of the flexible tape the seams with education fillable elevated ground cellular structure when laying flexible set of tapes of their long edges to reinforce the soil and the application operationer extended set of flexible tapes, characterized in that to increase the stability, strength and lateral stiffness of the geogrid flexible tape made of soft ruanruan materials and cell geocells have the shape of a hexagon, which binds the seams made Ravnopravie material tapes and double the distance between double stitches, not to exceed half of the distance between the inner seams pairs forming cells of the geogrid.

10. The geogrid under item 9, characterized in that the external tape in the set of flexible bands made dual or from a material with higher mechanical properties and light fastness.

11. The geogrid under item 9 or 10, characterized in that the ratio of the height of the cell to its coinciding with the direction of the slope of the diagonal is not less than the tangent of the slope strengthening of the soil.

 

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FIELD: building, particularly hydraulic structure reinforcement.

SUBSTANCE: method is performed in two-stages. The first stage involves forming vertical elongated flat ground massifs secured by hardening material. Massifs are created in crest embankment area and in upper area of embankment slope so that massifs are spaced minimal available distance from crest and pass through embankment body, including land-sliding upper embankment slope area. Massifs are anchored in mineral bottom by lower edges thereof and are arranged at least in three rows and there are at least three massifs in each row. Method for massifs forming involves driving double-slotted injectors directly in embankment ground or in wells formed in embankment and having plugged wellhead; orienting injector slots perpendicular to hydraulic pressure head vector direction in embankment area to be reinforced; injecting hardening material under increased pressure across horizons from top to bottom or in reverse direction, wherein injection is initially performed under 5-15 atm pressure and at minimal rate in each second injector of one outermost row beginning from extreme ones; feeding hardening material in previously missed injectors in this row; supplying injectors of another extreme row with hardening material in the same way; feeding hardening material to ejectors of medium rows under 10-20 atm pressure; performing the second reinforcement stage as material hardens to obtain 70% strength. The second reinforcement stage involves forming vertical elongated flat massifs of secured ground anchored in mineral bottom by lower edges thereof and arranged at least in three rows, wherein each one includes at least three massifs. Massifs extend at the angle exceeding embankment slope angle to horizontal line. Massifs are formed with the use of double-slotted injectors in remainder embankment area. Injector slots are directed perpendicular to hydraulic pressure head vector direction in embankment area to be reinforced. Hardening material is ejected in above succession, wherein hardening material pressure is equal to design process pressure enough for direction of feeding hardening material through injector slots and lesser than hardening material injection pressure of the first reinforcement stage.

EFFECT: increased reliability of structure reinforcement; prevention of land-slide on structure slopes.

3 cl, 3 dwg

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