Corrosion prevention device, corrosion prevention system, corrosion prevention embankment stabilization system, and corrosion prevention fixing method for geotechnical fixed elements

Abstract

The present invention relates to a corrosion protection device (44), in particular a corrosion protection adapter, for protecting at least an end region (10) of a geotechnical anchoring element (12) from corrosion, the geotechnical anchoring element (12) being made in particular of a corrosion-susceptible metal or a corrosion-susceptible metal alloy, such as construction steel or concrete steel, and having at least one sleeve element (14) adapted to be attached to the geotechnical anchoring element (12), the sleeve element (14) surrounding at least the end region (10) of the geotechnical anchoring element (12) in the circumferential direction of the geotechnical anchoring element (12). It is proposed that the sleeve element (14) is made at least predominantly of a corrosion-resistant metal and is provided with at least an external thread (16).

Description

[Technical field]

[0001] The invention relates to a corrosion protection device according to the preamble of claim 1, to a corrosion protection system according to claim 14, to a erosion protection embankment stabilisation system according to claim 18 and to a corrosion protection method for fastening geotechnical anchoring elements according to claim 20. [Background technology]

[0002] It has already been proposed to make geotechnical fastening elements entirely from stainless steel (see US Pat. No. 5,399,623 or US Pat. No. 5,499,636). However, such geotechnical fastening elements are very expensive compared to normal steel construction fastenings. As another alternative to steel construction fastenings, geotechnical fastening elements made of metallized fiberglass are known (see US Pat. No. 5,499,636). However, such geotechnical fastening elements have lower shear properties than metal fastenings and are not fire-resistant, so that the fastening effect may be lost in the event of a forest fire or the like. Plastic caps for fitting to the end regions of installed geotechnical fastening elements are also known (see US Pat. No. 5,499,636). These do not provide sufficient and lasting protection against corrosion, especially taking into account the general planning requirements for a durability of at least 100 years in the field of natural disasters. Plastic weathers and becomes brittle over time and may, for example, allow water to penetrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] German Patent No. 3320460 [Patent Document 2] European Patent No. 0060053 [Patent Document 3] Austrian Patent Application Publication No. 2010206027 [Patent Document 4] Canadian Patent Application Publication No. 2651242 Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to provide a general device with advantageous corrosion protection, in particular with regard to the protection of installed geotechnical fastening elements. This object is achieved according to the invention by the features of patent claims 1, 14, 18 and 20, further advantageous embodiments and variants of the invention can be taken from the dependent claims. [Means for solving the problem]

[0005] The present invention relates to a corrosion protection device, in particular a corrosion protection adapter, for protecting at least an end region of a geotechnical fixing element against corrosion, the geotechnical fixing element being made in particular of a metal or a metal alloy susceptible to corrosion, such as, for example, construction steel or concrete steel, and having at least one sleeve element adapted to be mounted on the geotechnical fixing element, the sleeve element surrounding at least the end region of the geotechnical fixing element in the circumferential direction of the geotechnical fixing element.

[0006] It is proposed that the sleeve element consists at least to a large extent of a corrosion-resistant metal, preferably a metal that is simultaneously mechanically stable and corrosion-resistant, and has at least an external thread. In particular, the external thread extends over at least a large part of the total length of the sleeve element. As a result, an effective corrosion protection performance can be achieved, in particular with regard to the protection against corrosion of the installed geotechnical fastening element. Beneficial corrosion protection can be achieved over a long period of time, in particular in the end regions of the fastening element that are installed in the ground and protrude from it. And particularly beneficial corrosion protection can be achieved over a long period of time, while keeping costs as low as possible.

[0007] A cost-effective corrosion protection for the geotechnical fastening element can be achieved. Retrofit corrosion protection can be obtained, which functions particularly beneficially over the long term and allows the functionality of the geotechnical fastening element to be fully maintained, e.g. fixing nuts can be screwed onto the end regions of the geotechnical fastening element without modification. Even after the corrosion protection has been applied, the full load-bearing capacity can be consistently maintained. Reliable corrosion protection can be provided simply and quickly. Mechanically stable corrosion protection against impacts, e.g. in the case of a rock falling on the end region of the geotechnical fastening element, can be achieved.

[0008] An "anti-corrosion device" is understood to be a device which slows down and / or at least substantially prevents corrosion or weathering, in particular measurable changes in the material, preferably the decomposition of the metal of the geotechnical fixing element by oxidation, which adversely affect the functionality of the geotechnical fixing element, for example the strength of the geotechnical fixing element or the toughness of the geotechnical fixing element. An "anti-corrosion adapter" refers in particular to an object, preferably an object which is configured separately from the geotechnical fixing element. The anti-corrosion adapter is installed on the geotechnical fixing element, which increases the corrosion resistance of the geotechnical fixing element and at the same time maintains the full functionality of the geotechnical fixing element, i.e. for example when a nut is screwed onto a geotechnical fixing element protected by the anti-corrosion adapter, it is at least substantially unaffected and / or at least substantially unaffected compared to a geotechnical fixing element without the anti-corrosion adapter. An "end region" of a geotechnical anchoring element is understood in particular to be a region which includes the front end of the geotechnical anchoring element and which comprises at most 30%, preferably at most 20%, preferentially at most 10% of the sub-region of the anchoring element which is continuously adjacent to the front end. In particular, the end region is configured at least as part of the geotechnical anchoring element which consists of a first sub-region and an adjacent second sub-region of the geotechnical anchoring element. The first sub-region is configured to protrude from the anchoring ground after installation. The second sub-region has at least 30%, preferably at least 50%, preferentially at least 100%, particularly preferably at most 300% of the longitudinal length of the first sub-region.

[0009] "Geotechnical fastening elements" refers in particular to rock fasteners, rock nails, ground nails, rod fasteners, strand fasteners, especially cable fasteners with an external thread, as described in DE 102018125782 A1, etc. "Metals susceptible to corrosion" is understood in particular to be metals, preferably metal alloys, other than stainless steels and other than superalloys, such as, for example, Inconel®, Incoloy®, Hastelloy®, Cronifer®, Nicrofer®, etc. "Stainless steel" means in particular steels having a chromium content of at least 10.5%, which is preferably dissolved in an austenitic or ferritic solid solution.

[0010] "Sleeve element" refers in particular to a sleeve-shaped, preferably tubular, solid elongated element, which at least partially surrounds the internal space at least in the circumferential direction, preferably also in at least one longitudinal direction. Preferably, the sleeve element is understood as an end sleeve-shaped element and / or a sleeve cap-shaped element, which at least forms a front surface against which an element, for example a geotechnical fastening element, which is inserted in the sleeve element and fills at least a large part of the sleeve element, abuts in the longitudinal direction. Preferably, the sleeve element is configured in a correctly installed state to completely surround an end region of the geotechnical fastening element, in particular at least in the circumferential direction of the geotechnical fastening element. In a correctly installed state, the geotechnical fastening element protrudes from the sleeve element in particular only on one of the two front surfaces of the sleeve element. In particular, the sleeve element is configured to be arranged at one end of the geotechnical fastening element, in particular at the end of the geotechnical fastening element which protrudes from the ground in an installed state of the geotechnical fastening element. The term "surrounding" preferably means "surrounding all around" and / or "surrounding over 360°". Preferably, the sleeve element is screwed to the geotechnical fastening element when attached to the geotechnical fastening element. "Configured" means in particular specially designed and / or equipped. An object being configured for a certain function is understood to mean in particular that the object performs and / or executes a certain function in at least one application and / or operating state.

[0011] In particular, the attached sleeve element covers only a sub-area of ​​the geotechnical fastening element, which is the only part of the geotechnical fastening element that is directly exposed to weather conditions in the installed (fixed) state of the geotechnical fastening element. By protecting this part of the geotechnical fastening element, the whole geotechnical fastening element can preferably be protected from corrosion. In particular, the sleeve element is configured to isolate the geotechnical fastening element from corrosive influences, for example atmospheric influences. In particular, the sleeve element is configured to form a surface against corrosive influences, for example atmospheric influences. "Mostly" and / or "Mostly" means in particular 51%, preferably 66%, preferentially 75%, particularly preferably 85%, particularly preferentially 95%. Preferably, a sleeve element that is at least mostly made of a corrosion-resistant metal is different from a corrosion-resistant coating (for example a zinc coating, a ZnAl coating, a corrosion-resistant varnish, etc.) and / or is different from a sleeve element that is made of a metal that is subject to corrosion and is coated with a corrosion-resistant layer. "Mechanical stability" refers in particular to the resistance to deformation caused by minor impacts and by its own weight. The sleeve element is in particular configured to have a bending stiffness.

[0012] "Corrosion-resistant metal" refers in particular to stainless steels or superalloys such as Inconel, Incoloy, Hastelloy, Cronifer, Nicrofer, etc. In particular, the external thread winds circumferentially around the surface of the sleeve element. In particular, the external thread is directly formed by the surface of the sleeve element. In particular, the external thread extends over the entire longitudinal length of the sleeve element. The external thread may be interrupted on both sides, as in common construction steel bars and concrete steel bars (threaded steel bars). In particular, the external thread is adapted to screw in a nut, in particular a clamping nut for a geotechnical fastening element. In particular, the sleeve element and / or the external thread have a constant and / or uniform diameter, in particular an outer diameter, along the longitudinal direction of the sleeve element.

[0013] It is further proposed that the sleeve element is configured as a cap that is at least partially, preferably completely, closed in the longitudinal direction of the sleeve element. This allows a beneficial corrosion protection to be achieved over time, particularly for the end region of the anchoring element that is installed in the ground and that protrudes out of the ground. Also, the ingress of water into the gap between the sleeve element and the geotechnical anchoring element is prevented. The geotechnical anchoring element can be totally isolated from the surrounding atmosphere. Also, the sleeve element can be easily attached to the geotechnical anchoring element. In particular, the at least partially closed cap forms a longitudinal abutment against the geotechnical anchoring element. By the sleeve element being configured as a "partially closed cap", it is understood that the sleeve element is configured in such a way that, when the sleeve element is attached to the geotechnical anchoring element, the end of the sleeve element covers and / or protects at least a part of the front surface of the geotechnical anchoring element, preferably at least 20%, preferentially at least 40%, in particular preferentially at least 66%, of the geotechnical anchoring element, as viewed along the longitudinal direction. In particular, the longitudinal direction is at least substantially perpendicular to the front surface of the geotechnical fastening element. In particular, a fully closed cap completely closes the front surface of the geotechnical fastening element in the longitudinal direction. "Cap" in particular means a closure member which closely abuts an end region of the geotechnical fastening element and is preferably configured separately from the geotechnical fastening element.

[0014] It is further proposed that the sleeve element is provided with an internal thread, which allows a beneficial and / or close arrangement of the sleeve element relative to the geotechnical fastening element, so that particularly beneficial corrosion protection can be provided over the long term. This allows the sleeve element to be easily screwed onto the geotechnical fastening element, which allows for a simple and error-free installation. In particular, the internal thread winds around the inner surface of the sleeve element in the circumferential direction. In particular, the internal thread is formed directly by the surface of the sleeve element. In particular, the internal thread extends over the entire longitudinal length of the sleeve element. As with common construction steel bars and concrete steel bars (threaded steel bars), the internal thread may be interrupted on both sides and may be formed in each case in a tubular circular shape between the interrupted parts. The internal thread is in particular configured for screwing the sleeve element onto the geotechnical fastening element, which is often provided with construction steel or rebar threads. In particular, the internal thread has a constant and / or uniform diameter, in particular an inner diameter, along the longitudinal direction of the sleeve element. In particular, the internal thread and the external thread have at least substantially the same thread range, and preferably at least substantially the same thread pitch, thread direction, thread shape and / or thread depth. "Substantially the same" means in particular identical excluding manufacturing tolerances. However, alternatively, the internal thread and the external thread may differ at least in thread pitch, thread direction, thread shape and / or thread depth. Preferably, the internal thread is configured as a left-handed thread. However, alternatively, the internal thread may be configured as a right-handed thread. Preferably, the external thread is configured as a left-handed thread. However, alternatively, the external thread may be configured as a right-handed thread.

[0015] It is further proposed that the internal thread in particular comprises a crest and the external thread in particular comprises a groove, the crest of the internal thread simultaneously forming the groove of the external thread (and vice versa). Preferably, all crests of all internal threads simultaneously form all grooves of all external threads (and vice versa). This allows a beneficial and / or effective force transmission from the nut screwed onto the outside of the sleeve element to the geotechnical fastening element. The sleeve element may have an at least substantially constant wall thickness. "At least substantially constant" in particular means that the range of variation is less than 3%, preferably less than 5%, preferentially less than 10% of the mean value. In particular, the wall thickness of the sleeve element is at least 1 mm, preferably at least 2 mm, advantageously at least 3 mm, preferentially at least 4 mm, particularly preferably at least 5 mm. In particular, the tip of the crest of the internal thread faces towards the interior of the sleeve element. In particular, the tip of the crest of the external thread faces away from the interior of the sleeve element. In particular, the bottom of the groove of the internal thread faces away from the interior of the sleeve element. In particular, the bottom of the groove of the external thread faces towards the inside of the sleeve element.

[0016] It is further proposed that the inner thread of the sleeve element and / or the outer thread of the sleeve element are formed as a thread with a coarse thread pitch of more than 5 mm, preferably more than 7 mm, advantageously more than 9 mm, particularly advantageously more than 12 mm, preferentially more than 15 mm, particularly preferably less than 21 mm. This allows advantageous attachment and tightness to be achieved. In particular, the inner thread of the sleeve element and / or the outer thread of the sleeve element are configured as a glide thread, preferably a round thread, preferably a coarse-pitched metric round thread. In particular, the inner thread of the sleeve element and / or the outer thread of the sleeve element may be formed as a pipe thread and connected to the geotechnical fastening element such that a tight joint is formed on the thread. In particular, threads with a thread shape that differs slightly from a perfect circular and / or evenly round thread shape, for example a slightly asymmetrical thread, are also considered as round threads in the present disclosure. Alternatively, the inner thread of the sleeve element and / or the outer thread of the sleeve element may be formed as a trapezoidal thread with a coarse thread pitch or as a rounded trapezoidal thread with a coarse thread pitch. In particular, the geotechnical fixing element has an external thread. In particular, the thread pitch, thread direction and / or thread form of the internal thread of the sleeve element are at least substantially complementary to the thread pitch, thread direction and / or thread form of the external thread of the geotechnical fixing element. In particular, the internal thread of the sleeve element is configured to interengage with the external thread of the geotechnical fixing element and / or with the thread ribs of the geotechnical fixing element. In particular, the internal thread of the sleeve element is configured to be screwed into the external thread of the geotechnical fixing element and / or with the thread ribs of the geotechnical fixing element. In particular, the thread pitch, thread direction and / or thread form of the external thread of the sleeve element at least substantially corresponds to the thread pitch, thread direction and / or thread form of the external thread of the geotechnical fixing element. In particular, the external thread of the sleeve element and the external thread of the geotechnical fixing element are formed at least substantially identical to each other, except for the diameter. Preferably, the thread pitch is calculated as the maximum distance between two adjacent thread turns in the longitudinal direction of the sleeve element, in particular the distance between the thread crests.

[0017] In addition to this, it is proposed to design the sleeve element, in particular the nut which is screwed onto the external thread of the corrosion protection device, in order to transmit forces between the sleeve element, in particular the nut, which is screwed onto the external thread of the corrosion protection device, and the geotechnical fastening element. This allows a retrofit corrosion protection function to be realized advantageously over a long period of time, with the geotechnical fastening element's functionality remaining fully functional. Also, even after the corrosion protection has been achieved, the full load-bearing capacity is constantly maintained. In order to achieve said force transmission, a particularly close fit is provided between the internal thread of the sleeve element and the external thread of the geotechnical fastening element. In particular, such a force transmission is made impossible by protective coatings, such as protective paints, varnishing, galvanizing, etc. Paint coatings, coatings and / or varnishes are often damaged when the nut is screwed on or when impacts or blows are applied, and the protective effect against corrosion is lost. In particular, the sleeve element has a resistance of at least 250 N / mm 2 , preferably at least 400N / mm 2 , preferentially at least 600N / mm 2 The shaft is made of a metal, preferably steel, having a tensile strength of .about.100 .mu.m.

[0018] Beneficial corrosion protection can be achieved, in particular protection against corrosion of the installed geotechnical fastening element, if the sleeve element is at least largely, preferably completely (possibly with the exception of any coating or paint), made of stainless steel, in particular stainless special steel (rust-resistant or non-rust-resistant steel). In particular, the sleeve element is made of stainless steel having material numbers 1.4001 to 1.4462 according to DIN EN standard 10027-2:2015-07, for example stainless steels having material numbers 1.4301, 1.4571, 1.4401, 1.4404 or 1.4462 according to DIN EN standard 10027-2:2015-07.

[0019] It is further proposed that the sleeve element is formed as a one-piece embodiment, preferably as a one-piece embodiment. This allows the sleeve element to be made more gastight, so that beneficial corrosion protection can be achieved. Furthermore, handling and / or installation can be simplified. "One-piece embodiment" means in particular that it is formed in one piece. This one-piece is preferably produced from a single blank, ingot and / or casting, particularly preferably by a sheet bending process. However, as an alternative, the sleeve element can also be formed as an at least two-part or multi-part embodiment, for example from two interconnected half-shells or from a tube element and a cover part that closes the tube element in the longitudinal direction.

[0020] If the sleeve element is a preformed part that is constructed separately from the geotechnical fastening element, the installation is easy. This allows a high degree of freedom since it is possible to provide a corrosion protection device for several different types of geotechnical fastening elements. Furthermore, the material input and / or the total costs can be kept low. In particular, the sleeve element is different from painting the geotechnical fastening element, varnishing the geotechnical fastening element, coating the geotechnical fastening element and / or covering the geotechnical fastening element with a flexible material (e.g. a plastic or metal film). It is conceivable that the sleeve element consists of a stainless steel sheet pressed onto the geotechnical fastening element, but preferably the sleeve element is constructed differently from a stainless steel sheet pressed onto the geotechnical fastening element.

[0021] It is also proposed that the inner space of the sleeve element is at least partially filled with a deformable sealing material. This allows the sleeve element to be particularly gas-tight, in particular with regard to contact of the geotechnical fastening element with water and / or air. Also, particularly effective and / or long-lasting corrosion protection can be achieved. In particular, the deformable sealing material can be configured as a grease or sealant, such as a lubricating grease. In particular, the deformable sealing material can be configured as a semi-fluid viscous material. The deformable sealing material may also be formed of a hardenable material, for example a cement paste. In particular, the inner space of the sleeve element is formed as a receiving space of the sleeve element for arranging the geotechnical fastening element. In particular, in the state in which the sleeve element is attached to the geotechnical fastening element, the gap between the sleeve element and the geotechnical fastening element is filled with the deformable sealing material.

[0022] Alternatively or additionally, it is proposed that the inner space of the sleeve element is at least partially filled with a deformable adhesive. This allows a particularly high airtightness of the sleeve element. Furthermore, a particularly effective and / or long-lasting corrosion protection can be achieved. Furthermore, a force transmission can be achieved favorably between a nut, which is screwed onto the external thread of the sleeve element, and the geotechnical fastening element. In particular, the deformable adhesive forms an inter-substance adhesive bond between the sleeve element and the geotechnical fastening element in the mounted state. Preferably, the adhesive is initially viscous and hardens after mounting while forming an inter-substance bond. In particular, in the mounted state of the sleeve element on the geotechnical fastening element, the gap between the sleeve element and the geotechnical fastening element is filled with a deformable adhesive. In particular, the adhesive may be a sealing material at the same time or vice versa.

[0023] In addition to this, it is proposed that the sleeve element can be attached, in particular screwed, to the geotechnical fixing element without the use of tools, which allows for a simple and / or cost-effective attachment. In particular, the sleeve element can be manually screwed onto the geotechnical fixing element, in particular onto the external thread or threaded rib of the geotechnical fixing element. In particular, the sleeve element can be screwed onto the geotechnical fixing element on-site during installation of the geotechnical fixing element. However, alternatively, the sleeve element can be pre-attached to the geotechnical fixing element before the geotechnical fixing element is installed.

[0024] It is further proposed that the sleeve element has a wall thickness which corresponds to at least 1.2%, preferably at least 2.5%, advantageously at least 3.5%, preferentially at least 5% and particularly preferably at most 15% of the maximum outer diameter of the sleeve element. This allows for a high stability of the sleeve element, so that the corrosion protection is maintained even after impacts on the sleeve element, such as by falling rocks. In particular, the maximum outer diameter of the sleeve element is determined by the crest of the external thread of the sleeve element. In particular, the wall thickness of the sleeve element corresponds to at least 30%, preferably at least 45% and preferentially at least 100% of the depth of the turns of the external thread (the distance between the crest and the groove of the external thread of the sleeve element, measured perpendicularly to the longitudinal direction of the sleeve element). In particular, the longitudinal length of the sleeve element along the longitudinal axis is at least 300 mm, in particular at least 450 mm. In particular, the longitudinal length of the sleeve element along the longitudinal axis is at most 2000 mm, preferably at most 1500 mm. In particular, the wall thickness of the sleeve element is at least 0.6 mm, preferably at least 1 mm, preferentially at least 1.5 mm, particularly preferentially not more than 3 mm. In particular, the outer diameter of the sleeve element is at least 16 mm, advantageously at least 20 mm, preferably at least 25 mm, preferentially at least 30 mm, particularly preferentially at most 50 mm.

[0025] It is further proposed that the sleeve element has a cross section that is periodically constant in the longitudinal direction. Preferably, the external thread of the sleeve element and / or the internal thread of the sleeve element has a cross section that is constant in the longitudinal direction, which in particular means that the diameter of the thread crest and the diameter of the thread groove are at least substantially constant in the longitudinal direction. This makes it possible to freely cut the sleeve element to the desired length in order to adapt it to a particular geotechnical fastening element. In particular, the sleeve element, preferably the external thread of the sleeve element and / or the internal thread of the sleeve element, does not taper in the longitudinal direction and / or does not thicken in the longitudinal direction.

[0026] Furthermore, a corrosion protection system is proposed which comprises a corrosion protection device and a geotechnical fastening element made of a metal which is particularly susceptible to corrosion, thereby allowing the installation of the geotechnical fastening element with high corrosion protection properties.

[0027] It is further proposed that the corrosion protection device is attached to the geotechnical fastening element in such a way that the gap between the sleeve element and the geotechnical fastening element is watertight closed against the environment and / or filled with a deformable sealant and / or filled with a deformable adhesive, whereby beneficial corrosion protection performances can be achieved, in particular with regard to protection against corrosion of the installed geotechnical fastening element, and also cost-effective corrosion protection can be achieved for the geotechnical fastening element.

[0028] It is further proposed that the sleeve element is attached to the geotechnical fastening element in such a way that in the state in which the geotechnical fastening element is fastened in the ground, a sub-region of the sleeve element, in particular a sub-region of the sleeve element located opposite the at least partially closed side in the form of a cap, is embedded in the ground. This makes it possible to make the sleeve element particularly airtight and to prevent the ingress of moisture or air into the gap between the sleeve element and the geotechnical fastening element, thus enhancing the corrosion protection function. By preventing the ingress of moisture into the gap, contact corrosion between the sleeve element and the geotechnical fastening element can be avoided. In particular, the part of the sleeve element that is embedded in the ground is fixed in the ground together with the geotechnical fastening element with mortar and / or concrete. In particular, the sub-region of the sleeve element is embedded in the ground together with the non-closed end region. In particular, the sub-region of the sleeve element, from which the geotechnical fastening element protrudes from the sleeve element, is embedded in the ground.

[0029] A particularly beneficial corrosion protection effect can be achieved if, in the fixed state, the geotechnical fastening element is arranged so that at least a quarter, preferably at least a third, preferentially at least 50% and particularly preferably at most 75% of the total longitudinal length of the sleeve element is embedded in the ground.

[0030] Furthermore, a corrosion-resistant embankment stabilization system is proposed, which comprises a corrosion protection system fixed to the ground, a wire mesh made of high-tensile steel, a clamping plate and a nut, the clamping plate being screwed to a geotechnical anchoring element, which is fixed to the ground and has a sleeve element, the clamping plate being pressed against the wire mesh in the longitudinal direction of the geotechnical anchoring element by a nut screwed to the sleeve element, whereby the wire mesh is fixed to the ground in an at least substantially positionally fixed manner, thereby making it possible to protect against corrosion and / or to achieve long-term stabilization of the embankment.

[0031] If at least one of the fastening plates, nuts and wire mesh has at least a stainless steel surface and / or is made entirely of stainless steel and the geotechnical fixing elements are made of a metal or a metal alloy that is subject to corrosion, in particular construction steel, a high corrosion protection function of the embankment stabilization system can be achieved despite the use of cost-effective standard fixing elements.

[0032] In addition to this, a method for corrosion-protection fastening of a geotechnical fastening element made of a corrosion-sensitive metal or a corrosion-sensitive metal alloy, in particular construction steel, is proposed, in which in at least one method step a sleeve element made at least to a large extent of a corrosion-resistant, preferably mechanically stable and corrosion-resistant metal and provided with an external thread is attached to an end region of the geotechnical fastening element, in at least one further method step the sleeve element is closed against the environment in a moisture-tight manner, and in at least one further method step the geotechnical fastening element is placed in the ground such that at least a sub-region of the sleeve element attached to the geotechnical fastening element is embedded in the ground, in particular mortared in the ground, thereby enabling the installation of a geotechnical fastening element made of a corrosion-sensitive metal with high corrosion protection.

[0033] It is furthermore particularly proposed that the sleeve element is formed as a channel. Alternatively, it is proposed that the sleeve element is formed by reshaping, in particular by pressing against a die or by blowing into a die. Alternatively, it is proposed that the sleeve element is formed by deep drawing.

[0034] It is furthermore particularly proposed that the corrosion protection system is adapted for use against static and / or dynamic loads, including impact stresses. Exemplary applications envisaged for the corrosion protection system include as adapters for rock nails, for example in rock stabilisation, as adapters for loose stone fastening, for example in embankment stabilisation, as adapters for foundation fastening of rockfall protection walls and footbridges, as fixing adapters in mining applications and / or tunnel construction, as adapters for tension and / or connection elements in roof structures and / or glass facades, etc.

[0035] The corrosion protection device according to the present invention, the corrosion protection system according to the present invention, the erosion protection embankment stabilization system according to the present invention, and the method according to the present invention are not limited to the above applications and examples. In particular, in order to achieve the functions described herein, the corrosion protection device according to the present invention, the corrosion protection system according to the present invention, the erosion protection embankment stabilization system according to the present invention, and the method according to the present invention may include individual elements, parts, method steps, and units different from the quantities described herein.

[0036] Other advantages will be understood from the following description of the drawings. In the drawings, exemplary embodiments of the present invention are shown. The drawings, the description and the claims contain a combination of multiple features. Those skilled in the art can consider these features individually according to the purpose and find further suitable combinations. [Brief description of the drawings]

[0037] [Figure 1] Schematic diagram of a portion of an erosion protection embankment stabilization system including an erosion protection system having an erosion protection device. [Diagram 2] Schematic side view of a sleeve element of a corrosion protection device. [Diagram 3] Schematic diagram of a cross section of a sleeve element. [Figure 4] 2 is a schematic perspective view of a first side (underside) of a sleeve element; FIG. [Diagram 5] Schematic perspective view of the second (upper) side of the sleeve element. FIG. [Figure 6]FIG. 13 is another schematic side view of a portion of the sleeve element in a screwed state with a geotechnical anchoring element of the embankment stabilization system. [Figure 7] Schematic cross-sectional view of a dike stabilization system including a corrosion protection system having a corrosion protection device. [Figure 8] 1 is a schematic flow chart illustrating a method for corrosion protection and fastening of a geotechnical fastening element. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] 1 shows a schematic diagram of a portion of an anti-erosion embankment stabilization system 50. The embankment stabilization system 50 extends over a ground 46. The embankment stabilization system 50 protects the environment of the ground 46 from erosion. The embankment stabilization system 50 comprises a wire mesh 52. The wire mesh 52 is made of high tensile steel wires. The high tensile steel wires of the wire mesh 52 have a strength of at least 800 N / mm 2 , preferably at least 1000 N / mm 2 , preferentially at least 1500N / mm 2 The high tensile steel wire of the wire mesh 52 has a tensile strength of up to 3000 N / mm 2 , preferably up to 2500N / mm 2 , preferably up to 2000N / mm 2 The wire mesh 52 has a tensile strength of 1000 MPa. The surface of the wire mesh 52 is stainless steel. The wire mesh 52 is made of stainless steel. The wire mesh 52 is configured to be laid two-dimensionally on the surface of the ground 46, such as a levee or rock wall.

[0039] The embankment stabilization system 50 includes a clamping plate 54. The clamping plate 54 rests on the wire mesh 52. The clamping plate 54 is configured to fasten the wire mesh 52 onto the ground 46. The clamping plate 54 is configured to press the wire mesh 52 against the ground 46. The clamping plate 54 is configured to span the meshes 72 of the wire mesh 52. For example, the clamping plate 54 is formed as a spike plate configured to engage the meshes 72 of the wire mesh 52. To engage the meshes 72 of the wire mesh 52, the clamping plate 54 formed as a spike plate includes a plurality of claw elements 74 angled toward the ground 46. Alternatively, the clamping plate 54 may be configured as an at least substantially planar plate without the claw elements 74. The clamping plate 54 is made of high tensile steel, but may also be made of a steel that is not high tensile steel. The clamping plate 54 is integrally constructed. The clamping plate 54 is made of stainless steel. The clamping plate 54 has a central opening 76 for receiving at least one geotechnical fixing element 12 (see also FIG. 7 ) of the embankment stabilization system 50. The geotechnical fixing element 12 is made of a metal or a metal alloy that is subject to corrosion. The geotechnical fixing element 12 is made of construction steel. The embankment stabilization system 50 comprises a sleeve element 14. The sleeve element 14 is arranged on the geotechnical fixing element 12 in an end region 10 of the geotechnical fixing element 12.

[0040] The embankment stabilization system 50 comprises a nut 30, which is configured to hold the clamping plate 54 pressed against the ground 46. The nut 30 is made of stainless steel. The nut 30 is threadedly engaged with the geotechnical anchoring element 12, which is screwed into the central opening 76 of the clamping plate 54, and more particularly with the sleeve element 14, which surrounds the geotechnical anchoring element 12. The sleeve element 14 is designed to transmit forces between the nut 30, which is threadedly engaged with the external thread 16 of the sleeve element 14, and the geotechnical anchoring element 12. By threading the nut 30, the nut 30 is pressed against the clamping plate 54, which is thereby pressed against the ground 46 and the wire mesh 52 along the longitudinal direction 80 of the geotechnical anchoring element 12. The above-mentioned fastening method fixes the wire mesh 52 with its position fixed relative to the ground 46. The embankment stabilization system 50 optionally includes a washer 58 disposed between the nut 30 and the clamping plate 54 when the embankment stabilization system 50 is in an installed state. The embankment stabilization system 50 includes a corrosion protection system 42. The corrosion protection system 42 is fixed to the ground 46. The corrosion protection system 42 is configured to provide corrosion protection to the geotechnical fixed element 12. The corrosion protection system 42 includes a corrosion protection device 44.

[0041] In Fig. 2 a schematic side view of the corrosion protection device 44 is shown. The corrosion protection device 44 comprises a sleeve element 14. The corrosion protection device 44, in particular the sleeve element 14, forms a corrosion protection adapter for the geotechnical fixing element 12. The corrosion protection device 44, in particular the sleeve element 14, is configured to protect the end region 10 of the geotechnical fixing element 12 against corrosion. The sleeve element 14 is configured to surround the end region 10 of the geotechnical fixing element 12 in the circumferential direction of the geotechnical fixing element 12. The sleeve element 14 is configured to seal the periphery of the end region 10 of the geotechnical fixing element 12 in the longitudinal direction 80 of the geotechnical fixing element 12. The sleeve element 14 is configured to be attached to the geotechnical fixing element 12 such that the end region 10 of the geotechnical fixing element 12 is surrounded in the circumferential direction of the geotechnical fixing element 12. The sleeve element 14 is configured to be mounted on the geotechnical fixing element 12 such that the end region 10 of the geotechnical fixing element 12 is closed in a longitudinal direction 80. The sleeve element 14 is embodied as a cap which is closed in a longitudinal direction 18 of the sleeve element 14. A front face 60 of the sleeve element 14 forms an abutment against the geotechnical fixing element 12. The longitudinal direction 18 of the sleeve element 14 and the longitudinal direction 80 of the geotechnical fixing element 12 are parallel to each other in the mounted state of the sleeve element 14.

[0042] The sleeve element 14 is made of a corrosion-resistant metal. The sleeve element 14 is made of stainless steel. The sleeve element 14 is constructed with a one-piece implementation. The sleeve element 14 is constructed as a one-piece structure. The sleeve element 14 is constructed as a preformed part, constructed separately from the geotechnical fastening element 12. The sleeve element 14 has an external thread 16. The external thread 16 is configured to receive a nut 30 (see FIG. 1). The external thread 16 extends over the entire longitudinal length 78 of the sleeve element 14. The external thread 16 is constant over the entire longitudinal length 78 of the sleeve element 14. The longitudinal length 78 of the sleeve element 14 shown exemplarily in FIG. 2 is 700 mm.

[0043] In Fig. 3 a cross section of the sleeve element 14 is shown diagrammatically. The external thread 16 has a thread pitch 28. The external thread 16 is embodied as a (rounded) trapezoidal thread. The external thread 16 is embodied as a thread with a coarse thread pitch 28 of more than 5 mm. In the case of the sleeve element 14 illustrated in Fig. 3 the thread pitch 28 of the external thread 16 is approximately 13 mm. The sleeve element 14 preferably does not have a separate external thread, i.e. it does not have a separate external thread turn.

[0044] The sleeve element 14 has an internal space 32. The sleeve element 14 is configured so that it is hollow inside (see also FIG. 4). The sleeve element 14 is configured as a cap that is closed on one side in the longitudinal direction 18 of the sleeve element 14 (see FIG. 5). The sleeve element 14 has an internal thread 20. The internal thread 20 is arranged in the internal space 32 of the sleeve element 14. The internal thread 20 has a thread pitch 28. The thread pitch 28 of the internal thread 20 and the external thread 16 is identical. The internal thread 20 is configured as a (rounded) trapezoidal thread. The (rounded) trapezoidal thread has thread sides 94, 96, which form a side angle 98. The side angle 98 is approximately 90°. The internal thread 20 is configured as a thread with a coarse thread pitch 28 of more than 5 mm. In the case of the sleeve element 14 illustrated in FIG. 3, the thread pitch 28 of the internal thread 20 is approximately 13 mm. The sleeve element 14 preferably does not have a separate internal thread, i.e. it does not have a separate internal thread turn.

[0045] The sleeve element 14 has a wall thickness 38. In the example shown in FIG. 3, the wall thickness 38 is about 1 mm. The internal thread 20 has a thread crest 22. A minimum inner diameter 86 of the sleeve element 14 formed by the thread crest 22 of the internal thread 20 corresponds to less than 30 times the wall thickness 38 of the sleeve element 14. In the illustrated configuration, the minimum inner diameter 86 is about 25.6 mm. The internal thread 20 has a thread groove 82. The internal thread 20 has a thread depth 88. The thread depth 88 of the internal thread 20 is greater than four times the wall thickness 38. The thread depth 88 of the internal thread 20 is less than ten times the wall thickness 38. In the example shown in FIG. 3, the thread depth is about 4.3 mm.

[0046] The external thread 16 has a thread crest 84. The maximum outer diameter 40 of the sleeve element 14 formed by the thread crest 84 of the external thread 16 corresponds to more than 30 times the wall thickness 38 of the sleeve element 14. The maximum outer diameter 40 of the sleeve element 14 formed by the thread crest 84 of the external thread 16 corresponds to less than 40 times the wall thickness 38 of the sleeve element 14. In the illustrated configuration, the maximum outer diameter 40 is approximately 31.9 mm. The external thread 16 has a thread groove 24. The external thread 16 has a thread depth 92. The thread depth 92 of the external thread 16 is greater than four times the wall thickness 38. The thread depth 92 of the external thread 16 is less than ten times the wall thickness 38. In the example shown in FIG. 3, the thread depth 92 of the external thread 16 is approximately 4.3 mm. The thread depths 88, 92 of the internal thread 20 and the external thread 16 are substantially identical. The thread crest 22 of the internal thread 20 of the sleeve element 14 also forms the thread groove 24 of the external thread 16 of the sleeve element 14. The wall thickness 38 therefore corresponds to at least 2.5% of the maximum outer diameter 40 of the sleeve element 14.

[0047] In figure 6 a schematic diagram of the sleeve element 14 and the geotechnical fixing element 12 is shown. The geotechnical fixing element 12 is provided with an external thread 90. The sleeve element 14 can be attached to the geotechnical fixing element 12. The sleeve element 14 can be screwed onto the geotechnical fixing element 12. The internal thread 20 of the sleeve element 14 can be screwed onto the external thread 90 of the geotechnical fixing element 12. The sleeve element 14 can be screwed onto the geotechnical fixing element 12 without the use of tools (the screwing and unscrewing directions are indicated by arrows 100 in figure 6).

[0048] In Fig. 7 a schematic cross-section of an embankment stabilization system 50 with a corrosion protection system 42 having a corrosion protection device 44 is shown. The geotechnical fastening element 12, in particular the corrosion protection system 42, is embedded in the ground 46 in the longitudinal direction 18 of the geotechnical fastening element 12. The corrosion protection system 42 comprises the geotechnical fastening element 12. The corrosion protection system 42 has a sleeve element 14. The sleeve element 14 is attached to the geotechnical fastening element 12. The corrosion protection device 44 is attached to the geotechnical fastening element 12 in such a way that a gap 62 between the sleeve element 14 and the geotechnical fastening element 12 (see the enlarged cross-sectional view of a part of the corrosion protection system 42 in Fig. 7) is sealed against the environment 66 in a watertight manner. The inner space 32 of the sleeve element 14 is at least partially filled with a deformable sealing material 34. A gap 62 of the corrosion protection system 42 between the geotechnical fastening element 12 and the sleeve element 14 screwed to the geotechnical fastening element 12 is filled with a deformable sealing material 34. The inner space 32 of the sleeve element 14 is at least partially filled with a deformable adhesive material 36. A gap 62 of the corrosion protection system 42 between the geotechnical fastening element 12 and the sleeve element 14 screwed to the geotechnical fastening element 12 is filled with a deformable adhesive material 36.

[0049] The sleeve element 14 is attached to the geotechnical anchoring element 12 such that in a state where the geotechnical anchoring element 12 is anchored in the ground 46 (e.g. in the state shown in Figures 1 and 7), the sub-region 48 of the sleeve element 14 is also embedded in the ground 46. The geotechnical anchoring element 12 is mortared. The geotechnical anchoring element 12 is surrounded by mortar 108. The sleeve element 14 is attached to the geotechnical anchoring element 12 such that in a state where the geotechnical anchoring element 12 is anchored in the ground 46 (e.g. in the state shown in Figures 1 and 7), the sub-region 48 of the sleeve element 14 is mortared in the ground 46 together with the geotechnical anchoring element 12. In the anchored / mortared state, the sleeve element 14 is arranged such that at least one third of the total length 78 is embedded in the ground 46. In the fixed / mortared state of the geotechnical fixing element 12, the sleeve element 14 extends from an end region 10 of the geotechnical fixing element 12, which is located on the outside (above the ground 46), to a sub-region 48 of the geotechnical fixing element 12, which is located on the inside (below the ground 46). In the sub-region 48, the sleeve element 14 is surrounded by mortar 108. To ensure that the open side of the sleeve element 14 is sealed (see also FIG. 4), the sleeve element 14 screwed to the geotechnical fixing element 12 is also partly mortared / embedded in the ground 46.

[0050] 8 shows a schematic flow chart of a method for fixing a geotechnical fixing element 12 made of a corrosion-sensitive metal or a corrosion-sensitive metal alloy with protection against corrosion. In at least one method step 102, a fixing drilling hole 104 is drilled into the ground 46. In at least one further method step 56, a sleeve element 14, which at least consists predominantly of a corrosion-resistant metal and is provided with an external thread 16, is attached to the end region 10 of the geotechnical fixing element 12. In method step 56, the sleeve element 14 is screwed into the external thread 90 of the geotechnical fixing element 12. In at least one further method step 68, the geotechnical fixing element 12 is placed in the ground 46 such that at least a sub-region 48 of the sleeve element 14 attached to the geotechnical fixing element 12 is embedded in the ground 46. In at least one sub-step 106 of the method step 68, the geotechnical fixing element 12 is inserted into the fixing drilling hole 104. Before or after the geotechnical fixing element 12 is inserted into the anchoring borehole 104, the sleeve element 14 is screwed onto the geotechnical fixing element 12 in such a way that the sleeve element 14 covers the end region 10 of the geotechnical fixing element 12 protruding from the ground 46. Before or after the geotechnical fixing element 12 is inserted into the anchoring borehole 104, the sleeve element 14 is screwed onto the geotechnical fixing element 12 in such a way that the sleeve element 14 extends partially into the anchoring borehole 104 when the geotechnical fixing element 12 reaches its anchoring position in the ground 46. In the installed state, at least one third of the total longitudinal length 78 of the sleeve element 14 is located within the anchoring borehole 104. Instead of screwing the sleeve element 14 onto the geotechnical fixing element 12 after the geotechnical fixing element 12 is inserted into the anchoring borehole 104, the sleeve element 14 can also be pre-installed onto the geotechnical fixing element 12 outside the anchoring borehole 104. In at least one further method step 64, the sleeve element 14 is closed in a moisture-tight manner against the environment 66. To achieve a moisture-tight closure, at least a part of the sub-region 48 of the sleeve element 14 extending into the anchoring borehole 104, in particular the entire part of the sleeve element 14 extending into the anchoring borehole 104, together with the geotechnical anchoring element 12 is mortar fixed in the ground 46, in particular in the anchoring borehole 104.In at least one further method step 110, the wire mesh 52 and / or the clamping plate 54 are placed on the geotechnical fastening element 12. In at least one further method step 112, the nut 30 is screwed onto the sleeve element 14 surrounding the end region 10 of the geotechnical fastening element 12. In method step 112, the nut 30 is screwed onto the sleeve element 14 such that the clamping plate 54 is pressed firmly against the ground 46 and / or the wire mesh 52. After completion of the above installation process, only the corrosion-protected elements of the embankment stabilization system 50, in particular the elements made of stainless steel of the embankment stabilization system 50, are exposed to the environment 66, i.e. the atmosphere surrounding the embankment stabilization system 50. [Explanation of symbols]

[0051] 10 end area 12 Geotechnical fixing elements 14 Sleeve elements 16 External thread 18 Longitudinal 20 Internal Thread 22 Screw Top 24 Thread groove 28 thread pitch 30 Nut 32 Interior Space 34 Sealant 36 Adhesive 38 wall thickness 40 Outer diameter 42 Corrosion Prevention System 44 Anti-corrosion equipment 46 Ground 48 Sub-areas 50 Embankment Stabilization System 52 Wire Mesh 54 Clamping plate 56 Method Steps 58 Washer 60 front 62 Gap 64 Method Steps 66 Environment 68 Method Steps 72 Mesh 74 Claw Element 76 Opening 78 Longitudinal length 80 Longitudinal 82 Thread groove 84 Screw Top 86 Inner diameter 88 Thread Depth 90 External thread 92 Thread Depth 94 Screw side 96 Screw side 98 Side Angle 100 Arrows 102 Method Steps 104 Fixed Drilling Hole 106 substeps 108 Mortar 110 Method Steps 112 Method Steps

Claims

1. A sleeve element (14) forming an anti-corrosion adapter for protecting at least the above-ground end region (10) of a geotechnical fastening element (12) against corrosion, said sleeve element (14) being a preformed part at least predominantly made of stainless steel and constructed separately from said geotechnical anchoring element (12), said sleeve element (14) having at least an external thread (16) and an internal thread (20); said sleeve element (14) being configured to be at least manually screwed on-site to said geotechnical anchoring element (12) in an installed state so as to surround said above-ground end region (10) of said geotechnical anchoring element (12) at least in the circumferential direction of said geotechnical anchoring element (12); the sleeve element (14) is designed, in the installed state, to transmit forces between a nut (30) screwed onto the external thread (16) of the sleeve element (14) and the geotechnical anchoring element (12); A sleeve element (14).

2. characterised in that at least a portion of the sleeve element (14) in the longitudinal direction (18) is preferably configured as a completely closed cap, A sleeve element (14) according to claim 1.

3. The thread crest (22) of the internal thread (20) also forms a thread groove (24) of the external thread (16). A sleeve element (14) according to claim 1.

4. The sleeve element (14) is provided with an internal thread (20), At least one of the internal thread (20) and the external thread (16) is configured as a thread having a coarse thread pitch of more than 5 mm. A sleeve element (14) according to any one of the preceding claims.

5. The sleeve element (14) is configured with an integral implementation. A sleeve element (14) according to any one of the preceding claims.

6. A sleeve element (14) according to any one of claims 1 to 5, characterized in that the internal space (32) of the sleeve element (14) is at least partially filled with a deformable sealing material (34).

7. characterised in that the internal space (32) of the sleeve element (14) is at least partially filled with a deformable adhesive material (36). A sleeve element (14) according to any one of the preceding claims.

8. characterised in that the sleeve element (14) can be screwed onto the geotechnical anchoring element (12) without the use of tools. A sleeve element (14) according to any one of the preceding claims.

9. characterised in that the sleeve element (14) has a wall thickness (38) which corresponds to at least 1.2% and preferably at least 2.5% of the maximum outer diameter (40) of the sleeve element (14), A sleeve element (14) according to any one of the preceding claims.

10. A sleeve element (14) according to any one of claims 1 to 9, said geotechnical anchoring element (12); A corrosion protection system (42) comprising:

11. characterised in that the sleeve element (14) is attached to the geotechnical anchoring element (12) in such a way that a gap (62) between the sleeve element (14) and the geotechnical anchoring element (12) is at least one of: closed against the environment (66) in a watertight manner; filled with a deformable sealing material (34); and filled with a deformable adhesive material (36). The corrosion protection system (42) of claim 10.

12. characterised in that the sleeve element (14) is attached to the geotechnical anchoring element (12) in such a way that, in a state in which the geotechnical anchoring element (12) is anchored in the ground (46), a sub-region (48) of the sleeve element (14) is embedded in the ground (46), 12. The corrosion protection system (42) of claim 10 or 11.

13. characterised in that, in the fixed state of the geotechnical anchoring element (12), at least one third of the total longitudinal length (78) of the sleeve element (14) is arranged to be embedded in the ground (46), The corrosion protection system (42) of claim 12.

14. 1. A erosion prevention embankment stabilization system (50), comprising: A corrosion protection system (42) according to any one of claims 10 to 13, fixed to a ground (46); A wire mesh (52) made of high tensile steel; A clamping plate (54); A nut (30), said clamping plate (54) being screwed to said geotechnical anchoring element (12); the geotechnical anchoring element (12) is anchored to the ground (46) and comprises the sleeve element (14); the clamping plate (54) is pressed against the wire mesh (52) in the longitudinal direction (18) of the geotechnical fastening element (12) by the nut (30) screwed onto the sleeve element (14), thereby fastening the wire mesh (52) to the ground (46) in an at least substantially positionally fixed manner; Corrosion prevention embankment stabilization system (50).

15. characterised in that at least one of the clamping plate (54), the nut (30) and the wire mesh (52) has at least a surface of stainless steel or is entirely made of stainless steel, and the geotechnical anchoring element (12) is made of a metal or a metal alloy that is susceptible to corrosion.

15. The erosion prevention dike stabilization system (50) of claim 14.

16. 1. A method for anti-corrosion fastening of a geotechnical fastening element (12) made of a metal or a metal alloy susceptible to corrosion, in particular of construction steel, comprising: a sleeve element (14) forming an anti-corrosion adapter for protecting at least an above-ground end region (10) of said geotechnical fixing element (12) against corrosion, said sleeve element (14) being a preformed part made at least predominantly of stainless steel and constructed separately from said geotechnical fixing element (12), said sleeve element (14) having at least an external thread (16) and an internal thread (20), said sleeve element (14) being configured to be screwed at least on-site manually onto said geotechnical fixing element (12) in an installed state so as to surround said above-ground end region (10) of said geotechnical fixing element (12) at least in the circumferential direction of said geotechnical fixing element (12), said sleeve element (14) being designed, in an installed state, to transmit forces between a nut (30) screwed onto said external thread (16) of said sleeve element (14) and said geotechnical fixing element (12), In at least one method step (56), the sleeve element (14) is attached to the above-ground end region (10) of the geotechnical anchoring element (12), In at least one further method step (64), the sleeve element (14) is closed in a moisture-tight manner against the environment (66), In at least one further method step (68), the geotechnical anchoring element (12) is placed in the ground (46) such that at least a sub-region (48) of the sleeve element (14) attached to the geotechnical anchoring element (12) is embedded in the ground (46), in particular mortar-fixed in the ground (46). method.

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