Method for high broken-profile bench slope protection against landslide

FIELD: mining, particularly to consolidate or to protect pit sides against landslide during pit operation.

SUBSTANCE: method involves laying transversal members connected to ropes along slope, wherein the ropes are fixedly secured to anchors located in upper bench berm; drilling inclined wells extending to bench slope; installing next anchor along lower edge of upper berm and drilling next inclined well cluster. Suspending net to bench slope and pulling down ropes from upper berm through drilled inclined wells so that the first rope ends extend from bench slope; lowering the rope ends to lower berm and securing thereof to transversal members arranged above the net, wherein the transversal members are installed beginning from lower berm; tightening the ropes and fastening the second rope ends to anchors.

EFFECT: increased operational safety and decreased labor inputs for bench slope consolidation.

1 ex, 2 dwg

 

The invention relates to mining and can be used to maintain or strengthen prone to falling of ledges quarry during its operation.

There is a method of strengthening career slopes. The method of strengthening is the following. From the top of the berm bench drill two inclined wells: one to exit to the surface slope of the ledge, the second outside surface slip. At the intersection of wells set the roller. From the bottom of the berm bench drill hole perpendicular to the inclined hole drilled outside of the sliding surface to the intersection with her. At the intersection of wells also set the roller. Through well skip the rope, pulling it through the rollers, with one end of its display surface of the lower berm bench and the other on the surface of the slope of the escarpment. The ends of the rope connect with metal plates, produce tension of the rope. The installation and tensioning of the rope hold up approach works to limit the pit on the lower ledge (RF Patent No. 2049916, application No. 4847225/03 declared 03.07.90 published 10.12.95, bull. No. 34).

This method in principle allows to increase the stability of the shelf in whole, but not applicable for strengthening the entire surface of the slope from fraying and wood thrown rock blocks. At quarries with high ledges broken pros who I am because of the limitations of the berm will not be enough space for proburivaya first inclined wells and at the location of the sliding surface of the outside of the ledge - it is impossible to drill a second. Proposed drilling and the location of the rollers at the intersection of these wells, and the technical difficulty in pulling the ropes through the pulleys makes practical application is difficult, especially for high 35-45-metre benches.

The closest in technical essence and the achieved result is the method described in coating design to strengthen career slopes. The method includes laying transverse elements on the slope of the ledge on the ropes, fixed anchors at the top of the berm scarp. The method is implemented as follows: at the top of the slope anchors fix the cable, put them on the slope; on the ropes fix cross, consisting of separate links pivotally connected to each other; then the slope is applied to a concrete floor (Ed. mon. The USSR №1745817. Floor to strengthen career slopes, application No. 4792007/03 from 16.11.89, published 07.07.92 year).

This method of strengthening is not applicable in open pits with high ledges broken profile. When applying concrete reinforcing covering elements (cables, cross, consisting of links), located on the slope of the height of 30 meters or more, there is a difficulty with his hold. Given that the fastening slave who you are in the pits with the angle of slope of the ledge 75 degrees or more, the use of concrete will require the development of new technology for spraying high ledges and special equipment for feeding solution to the surface of a slope that will lead to an increase in labor costs for these works.

The aim of the invention is to improve safety and reduce labor costs for the strengthening of slopes high ledges broken profile.

This objective is achieved in that in the method of strengthening the slopes of the high ledges of broken profile from fraying, including laying transverse elements on the slope of the ledge on the ropes, fixed anchors at the top of the berm scarp, previously with the upper berm scarp Buryats inclined wells to the slope of the ledge, hang on the slope of a flexible grid, through wells miss the ropes and laying transverse elements are from the bottom of the berm.

Preliminary, with the upper berm ledge, down hole drilling to the slope of the ledge allows for more safe and simple way to provide a fastening structure on the slope of the escarpment.

Hanging on a cliff ledge flexible mesh, which protects the slope from shedding breeds, leads to production safety work on the lower terrace of the ledge, as technological scheme of mining pit on the bottom of the berm are mining equipment and the people who carry out the drilling of the well is explosive block, charging CENTURIES wells, surveyor survey of drilling and blasting pattern. Hinged mesh between the slope of the ledge and crossbars protect the slope from erosion and shedding breeds, as the geological structure sizes small blocks of fractured ledge does not exceed the size of the grid cell.

The fixation cross (slabs) from the bottom of the berm can improve production safety work, as the mounting cross-beams and cables produced on a horizontal platform, and not on the height of the slope of the escarpment. Installation of metal structures so that the ropes were in front of the anchor, and then attaching them to significantly reduce the time for protective works, thus reducing labor costs.

Pinning on the slope of the flexible grid by pressing its cross with ropes fixed to them by their tension and rigid attachment of the anchors that are installed on the top of the berm that protects the slope from wood thrown large pieces of rock, which ensures the safety of the works, as located on the bottom of the berm mining equipment and people in accordance with the technological scheme of mining career is not in danger to fall under fall, can lead to loss of life and serious damage to mining equipment.

Figure 1 presents a section of the ledge of a broken profile. Figure 2 shows a top view of the mouth of the PA with design elements to implement the method, where

1 - ledge;

2 - drilling rig;

3 - anchor (pile), the pipe section 220×5 mm;

4 - slanted borehole;

5 - flexible mesh, such as mesh netting", 1 layer, section 2×40 mm;

6 - rope, section 30.5 mm;

7 is a cross-beams, channel 300×100 mm;

8 connection of the cable with a cross.

An example of a specific implementation

Currently on a career mining operation is underway. The need to strengthen the slope of the ledge due to the presence of fractured and vyvetrivayuschiesya rocks, weakens the strength properties of the ledge. It is necessary to maintain the ledge and thereby prevent further deformation.

Adopted the following source data: height ledge - variable 35-45 m, the angle of slope of the ledge - 75-90 degrees, take into account loads from transport.

The strengthening of the ledge is performed as follows.

In the beginning, conduct preparatory work: mechanized produce the sweep of berms and the frill of the slope of the escarpment. After conducting a mechanized ruffles separate the remaining nevisi, "visors", are cleaned manually by a team of drifters mountain slopes and carry out the grinding blade berm mechanized transport with the use of special equipment.

On the top of the berm scarp 1, three metres from the bottom edge, set the drilling machine 2 and drill under the anchor (with the Ayu) 3 depth of 4-5 meters. Set the anchor 3 and concreted it. Stepping back from the bottom edge to the length of the drilling machine 2, perpendicular to the upper edge of the ledge 1, on the same berm Buryats three inclined wells 4 through one meter to the slope of the escarpment. To set the angle of drilling deviated wells 4 the slope of the ledge 1 pre-divide the height into equal parts.

3-5 meters along the bottom edge on the ledge 1, 3 metres from the bottom edge, set the drilling machine 2, and drilling a well under a second anchor 3 (same depth) and install it. Similarly carry out the drilling of the second Bush deviated wells. Hang on cliff ledge 1 flexible grid 5, for example a grid of "netting".

From the top of the berm in inclined wells 4 skipping ropes 6, one end of which bring to the slope of the scarp 1 and lower on the underlying berm. On the underlying berm fix the cables 6 to the crossbars 7 (at a distance from the ends of cross-beams corresponding to the uniform distribution of loads on the slope) by welding 8. The cross member 7 is placed on the slope of the shelf 1, the pull ropes 6 to their full pressure to the surface and immobility and assign an armature 3, using welding. Anchors at the top of the ledge allow less time-consuming way, without additional special technical means to ensure the fastening of the retaining elements. Proishodiashie and flexible grid which is under the crossbars. The number of sections is determined by the length of the strengthened section according to the actual position of the ledge.

As a result of implementation of the method on the ledge turns out locked design. The proposed method allows to effectively strengthen the slope of the ledge during operation of the quarry by reducing labor costs, with a smaller amount of material to strengthen, and consequently to reduce the process of maintaining ledge, ensuring production safety safeguarding works and mining in the quarry development.

A way to strengthen slopes from fraying, including laying transverse elements on the slope of the ledge on the ropes, fixed mounted on the top of the berm bench anchors, characterized in that to ensure the strengthening of slopes with high ledges broken profile after installation of the anchors on the top of the berm Buryats inclined wells to the slope of the ledge, then along the bottom edge of the upper berm carry out installation of the following anchors and drilling of the next Bush deviated wells, then hang on the cliff ledge grid and the top of the berm in inclined wells drilled skipping ropes, one end of which bring to the slope of the ledge, put them on the underlying berm and fix it on top of the CE is Ki transverse elements, laying which are starting from the bottom of the berm, followed by tension cables and attaching the second ends of the cables to the anchors.



 

Same patents:

FIELD: building, particularly to reinforce landslide slopes, particularly extensive landslides.

SUBSTANCE: landslide control structure comprises bored piles fixed in stable slope ground layers and retained by anchoring means. To provide stability of lower landslide part inclined bars of anchor means are connected to bored pile heads. The anchor means are drilled down the slope and have fan-like structure. The anchor means are located at different levels in landslide body.

EFFECT: reduced labor inputs and material consumption for landslide control structure erection and increased stability of landslide massif.

2 cl, 2 dwg

FIELD: building, particularly to stabilize slope landslides.

SUBSTANCE: landslide control structure comprises vertical walls built in base formed under the landslide and located along the landslide so that distance between adjacent walls decreases towards lower landslide end. Vertical walls are made of pile rows defining pleat-like system having pitch preventing ground punching between the piles. The pleats are directed so that corner apexes thereof face sliding ground and grillages of adjacent pleat flanges are connected by transversal beams.

EFFECT: increased load-bearing capacity and increased technological efficiency of structure erection.

2 dwg

FIELD: agriculture, particularly steep slope terracing to adapt the slope for fruit trees and other crops growth.

SUBSTANCE: method for terracing slopes having steepness equal to or exceeding natural soil slip angle involves forming step-shaped ledges having depressions; scattering soil excavated from the slope over the ledges; stabilizing the soil with reusable rectangular netted retaining walls. The retaining wall has frame-like wall base created of welded angular or channel bars or bars of another cross-section. The wall bases are installed on the slope along lower ledge bounds and inclined at 60° angle with respect to horizon line. The wall bases are fixed by support and bearing wedges for a time equal to soil conglomeration time, wherein liquid or granular fertilizer is preliminarily introduced in soil and soil is laid down with perennial grass before ledge hardening.

EFFECT: increased slope use factor.

3 dwg

FIELD: building, particularly to erect ground structures, namely to consolidate slopes, to reinforce banks of motor roads and railroads, dams, irrigation channels and river banks.

SUBSTANCE: method for slope reinforcing with members arranged in slope body involves preparing ground surface by terracing disturbed layers thereof in accordance with geological structure thereof along with substituting ground in unstable areas for draining material; compacting the draining material and reinforcing thereof with grids of polymeric material having openings of not more than 1 m; arranging zinc-coated steel mesh formed by two-for-one twisting method and having hexahedral openings; connecting the steel mesh with above grids; dividing prepared slope surface into sections with pitch not exceeding 3 m by installing the partitions of zinc-coated steel mesh formed by two-for-one twisting method having height of not more than 0.3 m; scattering loamy ground to form loamy layer having 0.1 m thickness; compacting the loamy ground; scattering vegetable soil; laying bio-textile on vegetable soil and planting greenery.

EFFECT: increased flexibility of protective coating and improved environment protection.

2 dwg

FIELD: securing of slopes or inclines, particularly for ground slopes and water pool banks stabilization, for artificial water pool building and reconstruction, for minor river recovery and erosive slope consolidation.

SUBSTANCE: method involves performing masonry works of building members by laying building member layers in alternation with fabric layers. The building members are rough stones, which are connected one to another by fabric impregnated with binding material to provide elastic connection areas between stone layers. Ground stabilization device comprises masonry formed of building members alternated with fabric layers. The building members are rough stones, which are connected one to another by fabric to form elastic connection areas between stone layers.

EFFECT: increased environmental safety, improved appearance and technological effectiveness, increased elasticity of stone connection.

16 cl, 3 dwg, 2 ex

FIELD: manufacture of plant covers used for beautification of streets, squares, construction of sportive grounds, as well as for landscape designing.

SUBSTANCE: method involves spraying organic adhesive onto fine-mesh basalt net by means of specially designed equipment for filling meshes to thereby create strong carrier base. Net is perfectly ecologically safe and allows seeds to be uniformly sown over the entire area of lawn. Adhesive used for providing lawn is functioning as nutritive compound for seeds and is used simultaneously for protecting seeds from external influence of moisture and air during prolonged periods. After drying in first drying chamber, mixture of lawn grass seeds is sown onto carrier base through dosing hopper, followed by applying onto given mixture of organic adhesive and drying in second drying chamber. After discharge from drying chamber, ready dry lawn is cut into parts of various lengths, wound into roll and hermetically packed in polyethylene film for further storage and transportation. Lawn is placed on site by unwinding roll onto preliminarily prepared ground and spilling nutrient mixture thereon, followed by heavy irrigation to provide for sprouts emergence. Nutrient mixture and lawn grass seed mixture compositions are worked out depending on climatic zone and composition of parent ground on which lawn is to be provided.

EFFECT: increased efficiency by providing uniform sowing of seeds over the entire lawn area, and damage-free transportation and handling of grown lawn.

1 dwg

FIELD: building, particularly bridge building.

SUBSTANCE: method involves compacting ground of embankment body and cones; forming drainage layers and water-draining chutes on coating; creating pad with variable rigidity decreasing in direction from bridge along embankment for length equal to approach slab length; arranging approach slab having upward gradient in bridge direction. Pad of embankment body is formed by creating cast-in-place piles along with surface compaction of upper cast-in-place pile parts and upper embankment layer, wherein transversal cast-in-place piles form strips having medium rigidity jointly with ground forming embankments. The medium rigidity is reduced from maximal value at bridge pier to minimal one at approach slab end opposite to bridge pier.

EFFECT: reduced embankment subsidence under approach slab due to decreased pad and draining material displacement in horizontal direction.

8 cl, 6 dwg

FIELD: building, particularly for slope consolidation and for stabilizing deep front landslide areas.

SUBSTANCE: structure includes foundation mat and piles formed in wells grouped in rows. Upper pile parts are embedded in foundation mat, lower one is restrained by not-sliding ground layers. Piles are composite along their lengths. Central pile parts are not filled with concrete. Heights of upper and lower pile parts decrease towards landslide head. Structure to prevent deep front land-slides comprises separate local pile groups connected by foundation mats and located within landslide body boundaries. Each foundation mat has tension bars anchored in stable slope layers and arranged under and above foundation mat along slope to retain thereof against displacement and rotation.

EFFECT: improved slope stability, increased operational reliability of structure built on wide landslides, reduced building time and material consumption.

2 dwg

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

The invention relates to the field of construction and mining and can be used to restore the broken ledges during operation of the quarry

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

FIELD: building, particularly for slope consolidation and for stabilizing deep front landslide areas.

SUBSTANCE: structure includes foundation mat and piles formed in wells grouped in rows. Upper pile parts are embedded in foundation mat, lower one is restrained by not-sliding ground layers. Piles are composite along their lengths. Central pile parts are not filled with concrete. Heights of upper and lower pile parts decrease towards landslide head. Structure to prevent deep front land-slides comprises separate local pile groups connected by foundation mats and located within landslide body boundaries. Each foundation mat has tension bars anchored in stable slope layers and arranged under and above foundation mat along slope to retain thereof against displacement and rotation.

EFFECT: improved slope stability, increased operational reliability of structure built on wide landslides, reduced building time and material consumption.

2 dwg

FIELD: building, particularly bridge building.

SUBSTANCE: method involves compacting ground of embankment body and cones; forming drainage layers and water-draining chutes on coating; creating pad with variable rigidity decreasing in direction from bridge along embankment for length equal to approach slab length; arranging approach slab having upward gradient in bridge direction. Pad of embankment body is formed by creating cast-in-place piles along with surface compaction of upper cast-in-place pile parts and upper embankment layer, wherein transversal cast-in-place piles form strips having medium rigidity jointly with ground forming embankments. The medium rigidity is reduced from maximal value at bridge pier to minimal one at approach slab end opposite to bridge pier.

EFFECT: reduced embankment subsidence under approach slab due to decreased pad and draining material displacement in horizontal direction.

8 cl, 6 dwg

FIELD: manufacture of plant covers used for beautification of streets, squares, construction of sportive grounds, as well as for landscape designing.

SUBSTANCE: method involves spraying organic adhesive onto fine-mesh basalt net by means of specially designed equipment for filling meshes to thereby create strong carrier base. Net is perfectly ecologically safe and allows seeds to be uniformly sown over the entire area of lawn. Adhesive used for providing lawn is functioning as nutritive compound for seeds and is used simultaneously for protecting seeds from external influence of moisture and air during prolonged periods. After drying in first drying chamber, mixture of lawn grass seeds is sown onto carrier base through dosing hopper, followed by applying onto given mixture of organic adhesive and drying in second drying chamber. After discharge from drying chamber, ready dry lawn is cut into parts of various lengths, wound into roll and hermetically packed in polyethylene film for further storage and transportation. Lawn is placed on site by unwinding roll onto preliminarily prepared ground and spilling nutrient mixture thereon, followed by heavy irrigation to provide for sprouts emergence. Nutrient mixture and lawn grass seed mixture compositions are worked out depending on climatic zone and composition of parent ground on which lawn is to be provided.

EFFECT: increased efficiency by providing uniform sowing of seeds over the entire lawn area, and damage-free transportation and handling of grown lawn.

1 dwg

FIELD: securing of slopes or inclines, particularly for ground slopes and water pool banks stabilization, for artificial water pool building and reconstruction, for minor river recovery and erosive slope consolidation.

SUBSTANCE: method involves performing masonry works of building members by laying building member layers in alternation with fabric layers. The building members are rough stones, which are connected one to another by fabric impregnated with binding material to provide elastic connection areas between stone layers. Ground stabilization device comprises masonry formed of building members alternated with fabric layers. The building members are rough stones, which are connected one to another by fabric to form elastic connection areas between stone layers.

EFFECT: increased environmental safety, improved appearance and technological effectiveness, increased elasticity of stone connection.

16 cl, 3 dwg, 2 ex

FIELD: building, particularly to erect ground structures, namely to consolidate slopes, to reinforce banks of motor roads and railroads, dams, irrigation channels and river banks.

SUBSTANCE: method for slope reinforcing with members arranged in slope body involves preparing ground surface by terracing disturbed layers thereof in accordance with geological structure thereof along with substituting ground in unstable areas for draining material; compacting the draining material and reinforcing thereof with grids of polymeric material having openings of not more than 1 m; arranging zinc-coated steel mesh formed by two-for-one twisting method and having hexahedral openings; connecting the steel mesh with above grids; dividing prepared slope surface into sections with pitch not exceeding 3 m by installing the partitions of zinc-coated steel mesh formed by two-for-one twisting method having height of not more than 0.3 m; scattering loamy ground to form loamy layer having 0.1 m thickness; compacting the loamy ground; scattering vegetable soil; laying bio-textile on vegetable soil and planting greenery.

EFFECT: increased flexibility of protective coating and improved environment protection.

2 dwg

FIELD: agriculture, particularly steep slope terracing to adapt the slope for fruit trees and other crops growth.

SUBSTANCE: method for terracing slopes having steepness equal to or exceeding natural soil slip angle involves forming step-shaped ledges having depressions; scattering soil excavated from the slope over the ledges; stabilizing the soil with reusable rectangular netted retaining walls. The retaining wall has frame-like wall base created of welded angular or channel bars or bars of another cross-section. The wall bases are installed on the slope along lower ledge bounds and inclined at 60° angle with respect to horizon line. The wall bases are fixed by support and bearing wedges for a time equal to soil conglomeration time, wherein liquid or granular fertilizer is preliminarily introduced in soil and soil is laid down with perennial grass before ledge hardening.

EFFECT: increased slope use factor.

3 dwg

FIELD: building, particularly to stabilize slope landslides.

SUBSTANCE: landslide control structure comprises vertical walls built in base formed under the landslide and located along the landslide so that distance between adjacent walls decreases towards lower landslide end. Vertical walls are made of pile rows defining pleat-like system having pitch preventing ground punching between the piles. The pleats are directed so that corner apexes thereof face sliding ground and grillages of adjacent pleat flanges are connected by transversal beams.

EFFECT: increased load-bearing capacity and increased technological efficiency of structure erection.

2 dwg

FIELD: building, particularly to reinforce landslide slopes, particularly extensive landslides.

SUBSTANCE: landslide control structure comprises bored piles fixed in stable slope ground layers and retained by anchoring means. To provide stability of lower landslide part inclined bars of anchor means are connected to bored pile heads. The anchor means are drilled down the slope and have fan-like structure. The anchor means are located at different levels in landslide body.

EFFECT: reduced labor inputs and material consumption for landslide control structure erection and increased stability of landslide massif.

2 cl, 2 dwg

FIELD: mining, particularly to consolidate or to protect pit sides against landslide during pit operation.

SUBSTANCE: method involves laying transversal members connected to ropes along slope, wherein the ropes are fixedly secured to anchors located in upper bench berm; drilling inclined wells extending to bench slope; installing next anchor along lower edge of upper berm and drilling next inclined well cluster. Suspending net to bench slope and pulling down ropes from upper berm through drilled inclined wells so that the first rope ends extend from bench slope; lowering the rope ends to lower berm and securing thereof to transversal members arranged above the net, wherein the transversal members are installed beginning from lower berm; tightening the ropes and fastening the second rope ends to anchors.

EFFECT: increased operational safety and decreased labor inputs for bench slope consolidation.

1 ex, 2 dwg

Up!