Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
  • E02D29/00—Independent underground or underwater structures; Retaining walls
  • E02D29/02—Retaining or protecting walls
  • E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
  • E02D29/0241—Retaining or protecting walls comprising retention means in the backfill the retention means being reinforced earth elements
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
  • E02D17/00—Excavations; Bordering of excavations; Making embankments
  • E02D17/18—Making embankments, e.g. dikes, dams
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
  • E02D29/00—Independent underground or underwater structures; Retaining walls
  • E02D29/02—Retaining or protecting walls
  • E02D29/0225—Retaining or protecting walls comprising retention means in the backfill

Definitions

• This invention concerns a method for constructing a steep embankment or slope.
• various techniques are known for building steep slopes.
• the known techniques stem from the wish to achieve stable slopes since, in many cases, for construction purposes or traffic related reasons it is necessary to execute a given embankment so steep that the embank- ment cannot be constructed solely with earth or gravel materials and would not in itself be stable enough to resist erosion for a longer period of time. Par ⁇ ticularly it cannot resist erosion due to precipitation, including rain showers, the effects of melting water etc.
• Such an embankment must furthermore in certain cases fulfil specific requirements or wishes with regard to appearance, including vegetation, stone kerbing, wooden or facade coating.
• An object of the present invention is to achieve a technique which eliminates the aforesaid drawback in the prior art, and particularly enables a more flexible adaptation and construction of an embankment on site and at the same time enables the construction of an embankment using a universal set of elements which may be produced with universal dimensions and combined on site accord ⁇ ing to a given required embodiment, i.e. corresponding to the embankment to be constructed.
• an anchor element which in accordance with alternative embodiments may consist of an anchorage grid, an anchor peg or an anchor block as well as one or more anchorage braces or struts, a reinforcement may be constructed in an embankment, it being possible to construct said reinforcement on site and adapt it to the given specifications and requirements, including ad hoc adjustment.
• a reinforcement may be constructed in an embankment, it being possible to construct said reinforcement on site and adapt it to the given specifications and requirements, including ad hoc adjustment.
• the method according to this invention preferably further comprises a step wherein one or more layers of geo-net and one or more layers of geo-textiles which may be mutually interconnected or placed overlapping one another under or above the anchor element as well as preferably behind the front grid.
• the front grid may constitute a component left in place after construction of the embankment and, depending on the specific use, it may be made from corrosion- resistant material or alternatively from non corrosion-resistant material. If the front grid is to remain intact as a reinforcement element in the embankment even after a long span of years, the front grid must naturally be made from corrosion- resistant material. In case of subsequent planting and thereby so to say natural reinforcement of the embankment built according to the method of the invention the front grid may be made from non corrosion-resistant material, the front grid corroding away after a period of time.
• the method may, according to an alternative embodiment, further comprise the final step of removing the front grid after construction of the finished embankment, including any planting on the completed embankment.
• Erecting of the front grid according to the method of the invention may take place in any suitable way, including fixing of the front grid by means of anchoring pegs driven down at the bottom edge of the front grid once it has been raised to the desired inclination in relation to horizontal and possibly temporarily supported and fixed by means of temporary anchor struts or the like.
• a stable securing of the front grid is carried out by digging a trench prior to or during the erection of the planar front grid and erecting and securing the planar front grid in said trench using sand, gravel, concrete or a mixture thereof.
• This invention also relates to a system for building a steep embankment, said system being adapted to carry out the method of the invention, and in accordance with the invention the system is characterized by comprising a planar front grid adapted to be positioned with an inclination corresponding to the completed embankment immediately adjacent the front of the completed embankment, an anchor element adapted to be placed in the earth formation behind the completed embankment and one or more anchor braces or struts adapted to connect and secure the front grid relative to the anchor element when the front grid is positioned with the said inclination and when the anchor element is placed in the earth formation.
• the system according to this invention constitutes the aforesaid universal system which can be immediately assembled on site from a simple number of elements in accordance with the desired shape of the steep embankment, also in- eluding consideration of possible wishes for adjustments to special conditions that might occur during the construction work.
• the system according to this invention further and in accordance with the pre ⁇ ferred method of the invention mentioned above comprises geo-nets or geo-tex- tiles intended to be placed within the earth formation under or over the anchor element and preferably also behind the front grid.
• the anchoring system according to the pres ⁇ ent invention may consist of an anchor grid, an anchor peg, an anchor block or the like or a combination thereof.
• the system according to the present invention may be designed with a front grid made of corrosion resistant or, alternatively, non corrosion-resistant material.
• the invention further concerns an embankment or slope which is constructed according to the teachings of the invention, and in which anchoring members have been placed for anchorage of the earth formation lying behind the embankment, said embankment in accordance with the invention being characterized in that a planar front grid is positioned within the embankment and having an inclination corresponding to that of the completed embankment, that in the earth formation behind the embankment an anchor element is placed, that between said front grid and said anchor element firm anchoring is provided by means of one or more anchor braces or struts which secure the front grid in relation to the anchor element and that possibly furthermore one or more layers of geo-net or one or more layers of geo-textiles have been inserted which may be mutually interconnected or placed overlapping each other under or over the anchor element and preferably also behind the front grid.
• fig. 1 is a schematic perspective view of the preferred embodiment of the method and the system according to the invention, in which the anchorage of a front grid is ensured by anchoring grids,
• fig. 2 is a schematic perspective view of a first alternative embodiment of the method and system according to the present invention, in which the anchoring of the front grid is ensured by anchor pegs,
• fig. 3 is a schematic perspective view of a second alternative embodiment of the method and system according to the present invention, in which the anchorage of the front grid is ensured by anchor blocks,
• fig. 4 is a schematic cross-section view of a steep embankment according to the present invention built by repetition of the method shown in fig. 1 and having inserted reinforcement nets,
• fig. 5 is a schematic cross-section view of a steep embankment with varying level and built according to the method of the present invention
• fig. 6 is a schematic cross-section view of a steep embankment according to the present invention built according to the method of the present invention and hav ⁇ ing a reinforcement net arranged at a distance rearwards, and
• fig. 7 is a schematic cross-section view of a steep embankment according to the present invention built according to the method of the present invention and having an outer coating.
• the same reference numerals have been used for identical elements fulfilling identical or equivalent functions and located in identical or equivalent positions.
• the reference numerals carrying a single, double or triple mark desig- nate identical elements in different positions or at different levels.
• the method of building steep embankments in earth comprises the digging of a trench 1 having a depth and a width of approximately 30 cm for receiving and securing a front grid 2 at an angle corresponding to that of the completed embankment.
• the front grid 2 is a per se conventional reinforcement grid made of iron, steel, aluminium or other suitable material or a combination thereof.
• the front grid may be corrosion resistant in order to impede the decay of the front grid over time or, as an alternative, it may constitute a non corrosion resistant breakable front grid which deliberately decays within a shorter or longer period of time after the embankment has been established.
• the front grid has a mesh size varying according to the given use between 5 and 50 cm, typically 10-20 cm, like 15 cm.
• a temporary bracing 3 Sand, gravel, concrete or a mixture thereof is poured into the trench 1 for securing the front grid 2, and the inclination thereof is stabilized by anchoring on the side where the earth reinforcement is to made by means of two anchor braces or struts 4a and 4b.
• the anchor braces or struts 4a and 4b are fixed in the ground by means of a fixing peg or bracket 6 and at the other and they are fixed at the front grid 2 on the same sloping grid line so that the anchor brace or strut 4b is lying on the ground, that the brace or strut 4a forms an angle a less than 90° with the inclined plane of the front grid 2 and that the point of fixture at the front grid is situated at a height less that 0,5 m.
• the anchor brace or strut 4b may be secured closer to the front grid but preferably on the same ground projection line of the anchor brace or strut 4a and at an angle ⁇ with the front- grid normally smaller than the angle ⁇ .
• the anchor braces or struts are also secured by means of the fixing peg to an anchor element 5 in such a manner that the combined translatory and rotary movement of the anchor braces or struts 4a and 4b is prevented by the resistance of the anchor element 5.
• the anchor element 5 (which may be an anchor grid as in fig. 1, an anchor peg as in fig. 2 or an anchor block as in fig. 3) is placed at a certain distance in the longitudinal direction from the grid, typically a distance of 1-5 m, like 1-3 m, preferably about 1 m. Even though the anchor braces or struts 4a and 4b in fig. 1 are shown secured by means of the fixing peg 6, the anchor braces or struts 4a and 4b may, as an alternative, be secured directly to the anchor element 5.
• the position of the anchor braces or struts 4a and 4b with relation to the anchor grid 5 and the front grid 2 may be changed according to the given use and that according to the given use, a varying number of anchor braces or struts may be used in connection with a front grid depending on the given circumstances, including especially the angle or inclination of the front grid in relation to horizontal and the given soil conditions.
• Fig. 2 is a schematic perspective view of a first alternative embodiment of a method and system according to the present invention similar to the preferred embodiment shown in fig. 1 , but with the front grid 2 anchored by means of anchor pegs 5.
• Fig. 3 is a schematic perspective view of a second alternative embodiment of a method and system according to the present invention similar to the first alternative embodiment shown in fig. 2, but with the front grid 2 anchored by means of anchor blocks 5.
• Fig. 4 shows a schematic cross-section view of a steep embankment built by re ⁇ petition of the method described above with reference to fig. 1.
• a trench 1 may optionally be dug for receiving and securing the front grid, said trench being filled with sand, gravel, concrete or a mixture thereof once the front grid 2 has been placed therein, the front grid 2 is adapted to and maintained at the desired angle by means of the temporary bracing 3, not shown in fig. 4 but shown in fig. 1 , the temporary bracing is removed when the embankment is stable, a plant mat or geo-textile 8 may be suspended, as shown by dotted lines in fig.
• reinforcement material 7 is laid on the ground or on the latest compressed layer of earth or gravel and is suspended at a height of approximately 2 m on the inner part of the front grid 2 on the plant mat or geo-textile 8, the front grid is anchored by means of the anchor braces or struts 4a and 4b which are secured to the ground and the anchor element 5, a filling up with earth and/or gravel is carried out behind the front grid 2 up to the desired level where the next layer of reinforcement material is to be laid out, thereafter the suspended reinforcement material is flipped back over the finally compressed layer of earth and/or gravel.
• the steps a-h are repeated until the height of the structure corresponds to the desired height of the embankment and it may be covered by the material chosen to serve the desired purpose, e.g asphalt -for road construction- or trees and/or bushes -to prevent landslides.
• reinforcement material 7 may instead be used steel net, the mesh size and dimensions of which may vary according to the design.
• the plant mat 8 may be a biodegradable coir mat or a geo-textile which is positioned immediately behind the facade of the wall and has the purpose of holding back top soil and which is built into the front of the embankment and of ensuring that the subsequent sowing is bound to the embankment.
• Special mats of mineral wool may also optionally be used.
• Fig. 5 is a schematic cross-section view of a steep embankment having a dis ⁇ placed front and being built in accordance with the method according to the present invention.
• the construction of the steep em ⁇ bankment is initiated in the same way as the construction of the embankment shown in fig. 4, but each time the construction of an individual section of the displaced front is started, a new front grid 2' (possibly 2", 2"' etc. not shown in the figure) is positioned at a distance from and rearwardly displaced with respect to the front grid 2.
• the layer of reinforcing material 7 is countersunk for a distance behind the front grid 2 and dug down at the position where the second front grid 2' is to be installed.
• Fig. 6 is a schematic cross-section view of a steep embankment built according to the method of the present invention and having a set back reinforcement net 7 and stonework 9.
• the principle of construction is like the principle described in connection with fig. 5; but the reinforcement net 7, however, is placed at a dis ⁇ tance from the front grid 2 to provide space between the front grid 2 and the re- inforcement net 7 for filling up with stones simultaneously with the other side of the reinforcement net 7 is filled with earth.
• Fig. 7 is a schematic cross-section view built up in accordance with the method of the present invention and having an outer coating 10 which is secured by means of brackets 11 , which again are anchored in the embankment by means of a number of anchor braces or struts 12.
• the embankment is otherwise constructed equivalently to the embankment described above with reference to fig. 5, however, without a displaced front.
• an embankment is established in a simple way by means of universally applicable elements, a front grid, an anchor element, a number of anchor braces or struts and one or more layers of geo-net or one or more layers of geo-textiles, said embankment having any inclination and being designed with any desired outward appearance, including planting, coating etc.
• the technique according to the present invention does not set out any specific re ⁇ quirements as to the design of especially configured components such as especially designed support grids, and the erection of the reinforcement system according to the present invention may be carried out according to the given conditions on a plane or slightly sloping ground and may furthermore be directly integrated with already existing facilities.
• the front grid may be removed after con ⁇ struction of the embankment or alternatively be left within the embankment for subsequent corrosion or alternatively it may serve as formwork during the con ⁇ struction of a coating.
• the front grid may furthermore serve as protection against malicious damage, vandalism, erosion etc. for a long span of years.
• the stability of the embankment is secured by the remaining reinforcement elements, including the anchor element, the geo-nets or the geo- textiles.
• a facade coating may be designed in the form of stonework, whereupon the reinforcement material should not be visible and this is facilitated by erecting the reinforcement material at a distance behind the front of the completed embankment, whereby the front grid serves to determine the overall stability of the embankment and consequently should be constructed of cor- rosion-resistant material.
• the system characteristic of the invention comprises a plane front grid, an anchor element and anchor braces or struts as well as geo-nets or geo-textiles and does not require any special design of the individual elements, but it facilitates, however, an adaptation of the simply designed elements according to the given application, including adaptation to specific demands and unforeseen conditions during the construction of the embankment.
• the technique according to the present invention may furthermore be used for construction of dams and coast protection installations or other similar safety installations.

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• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Paleontology (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Environmental & Geological Engineering (AREA)
• Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
• Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
• Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
• Tents Or Canopies (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Hydrogenated Pyridines (AREA)
• Building Environments (AREA)
• Buildings Adapted To Withstand Abnormal External Influences (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Piles And Underground Anchors (AREA)
• Paper (AREA)
• Indole Compounds (AREA)
• Photoreceptors In Electrophotography (AREA)

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• 1996
  • 1996-05-10 DK DK056396A patent/DK56396A/da not_active Application Discontinuation
• 1997
  • 1997-05-07 EP EP02013855A patent/EP1256660A1/fr not_active Withdrawn
  • 1997-05-07 PL PL97329847A patent/PL183988B1/pl not_active IP Right Cessation
  • 1997-05-07 DE DE69717619T patent/DE69717619T2/de not_active Expired - Lifetime
  • 1997-05-07 AT AT97921634T patent/ATE229110T1/de active
  • 1997-05-07 AU AU27636/97A patent/AU2763697A/en not_active Abandoned
  • 1997-05-07 EP EP97921634A patent/EP0897435B1/fr not_active Expired - Lifetime
  • 1997-05-07 DK DK97921634T patent/DK0897435T3/da active
  • 1997-05-07 WO PCT/DK1997/000209 patent/WO1997043489A1/fr active IP Right Grant
• 1998
  • 1998-11-10 NO NO19985251A patent/NO320078B1/no not_active IP Right Cessation

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