EP0494099B1 - Wall reinforcement - Google Patents
Wall reinforcement Download PDFInfo
- Publication number
- EP0494099B1 EP0494099B1 EP19920200823 EP92200823A EP0494099B1 EP 0494099 B1 EP0494099 B1 EP 0494099B1 EP 19920200823 EP19920200823 EP 19920200823 EP 92200823 A EP92200823 A EP 92200823A EP 0494099 B1 EP0494099 B1 EP 0494099B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tie
- space
- core
- fins
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000002787 reinforcement Effects 0.000 title description 9
- 239000000463 material Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 239000004570 mortar (masonry) Substances 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000011162 core material Substances 0.000 description 11
- 239000011449 brick Substances 0.000 description 9
- 238000010008 shearing Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4178—Masonry wall ties
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4178—Masonry wall ties
- E04B1/4185—Masonry wall ties for cavity walls with both wall leaves made of masonry
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
- E04B1/7608—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising a prefabricated insulating layer, disposed between two other layers or panels
- E04B1/7612—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising a prefabricated insulating layer, disposed between two other layers or panels in combination with an air space
- E04B1/7616—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising a prefabricated insulating layer, disposed between two other layers or panels in combination with an air space with insulation-layer locating devices combined with wall ties
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/02—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls built-up from layers of building elements
- E04B2/14—Walls having cavities in, but not between, the elements, i.e. each cavity being enclosed by at least four sides forming part of one single element
- E04B2/16—Walls having cavities in, but not between, the elements, i.e. each cavity being enclosed by at least four sides forming part of one single element using elements having specially-designed means for stabilising the position
- E04B2/20—Walls having cavities in, but not between, the elements, i.e. each cavity being enclosed by at least four sides forming part of one single element using elements having specially-designed means for stabilising the position by filling material with or without reinforcements in small channels in, or in grooves between, the elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/02—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls built-up from layers of building elements
- E04B2/28—Walls having cavities between, but not in, the elements; Walls of elements each consisting of two or more parts kept in distance by means of spacers, all parts being solid
- E04B2/30—Walls having cavities between, but not in, the elements; Walls of elements each consisting of two or more parts kept in distance by means of spacers, all parts being solid using elements having specially designed means for stabilising the position; Spacers for cavity walls
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/012—Discrete reinforcing elements, e.g. fibres
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0222—Replacing or adding wall ties
Definitions
- This invention relates to the reinforcement of the walls. Reinforcement in this sense includes mainly the stabilisation of existing walls, but can involve new walls in certain circumstances.
- One object of the present invention is to provide a reinforcement system for an existing wall or wall leaf which has cracked or slipped.
- GB-A-2007287 discloses a method of reinforcing a brick wall in which a deep slit is cut into the masonry. In order to prevent collapse, support plugs are located in the slit at intervals. A number of carbon steel wires are then embedded in the slit in an epoxy resin cement.
- GB-A-1233175 discloses a dovel-like pin with helical flanges which is intended to be used in connecting two ore more separate structural members always introduced axially.
- a method for reinforcing a wall which comprises forming a space in the wall material, locating a structural tie in the space formed and grouting or cementing the tie in position, whereby the maximum diameter of the entire tie being 10mm, characterised in that tie comprises a length of wire preferably of corrosion resistant material including a core and preferably two or more externally projecting fins or ridges, the diameter of the core being 2 to 6mm.
- the length When used for stabilisation or reinforcement in a brick wall, the length might be up to 1 or 2 metres, or about nine bricks' length.
- the fins or ridges might be about 1 or 2 millimetres proud of the surface of the core or possibly they might be a distance from the core equal to the diameter of the core to leave a substantial flange providing a good grip in the surrounding wall material.
- the overall cross section of maximum 10 millimetres is sufficiently small to enable the tie to be inserted in the space left by raking out the mortar in cracked brickwork, after which the wall would be repointed around the inserted reinforcement.
- a tie (or ties) can easily be introduced into a long line of mortar between several bricks, and if necessary can be bent to extend both vertically and horizontally.
- the ease with which the tie can be bent is another advantage arising from the small core dimensions and it enables a tie to have two bends so that its two ends are parallel with each other and are joined by an intermediate portion at an angle to the two ends.
- the tie can be easily made using a pair of rollers of novel form.
- the rollers will have generally cylindrical surfaces with a parallel sided slot at the centre and then as round or square section rod is fed into the nip of the rolls, the section will be first out at the edge of the slots and then deformed so that the cut material is squeezed into the gap between the rollers at their closest point to define a pair of opposed fins. No material is lost but the material is deformed to leave a generally rectangular sectioned core with fins extending from either side, and the section can then be uniformly twisted in a subsequent manufacturing step.
- the method of forming the fins by a combination of shearing and squeezing forces work hardens and stretches the fin material without hardening the core material. This predisposes the material for transformation by twisting into a tight and constant helix without the need for annealing and provides maximum hardness in the fins.
- the width of the fins can be chosen by appropriate setting of the spacing between the rollers.
- a single pass of the rollers can be sufficient to form the desired section, even with a hard metal such as stainless steel.
- a double pass enables four fins to be provided.
- wire Another possible form of the wire is a triangular section, simply uniformly twisted along its length, with a squared off end.
- the corner edges of the triangular section will act nearly as well as the fins in embodiments involving embeddment in mortar.
- the invention also provides for the use of a tie to provide tensile reinforcement to improve the performance of structural members made of materials in which a particularly efficient mechanical bond is necessary to transfer the stresses from the material to the reinforcing wire.
- materials may include for example portland cement and/or resin based concretes which are aerated or made with lightweight aggregates and natural organic materials such as timber.
- the ties may be embedded in some materials as they are cast and with others such as timber may be pressed into grooves cut in their surfaces. Since the wires are made of a corrosion resistant material such as stainless steel they can be used close to the surface of a member exposed to moisture in a corrosive environment.
- the ties can also assist in the transfer of loads from the end of one structural member into another structural member which may be of a dissimilar material.
- the rod shown in Figure 1 is straight and of constant cruciform cross section, the arms of the cruciform being uniformly twisted about the axis of the rod and forming helical ribs or fins 4 around the central solid core of the rod.
- the rod shown in Figure 2 is of constant triangular cross-section and is uniformly twisted with a pitch of approximately twice the maximum cross-sectional dimension of the rod.
- Figure 3 shows a straight bulbous rod of varying circular cross section, having annular rings 8 in the form of truncated spheres.
- Figure 4 shows a rod having one end formed with axially arranged flat sections 9 alternately in planes at right angles to their neighbours.
- the helical ribs 4 of the rod shown in Figure 1 served to provide a strong grip of the rod within mortar over short distances of embedment or penetration; the curves 6 of the rod shown in Figure 2, the rings 8 of the rod shown in Figure 3, and the sections 9 in Figure 4, also provide a strong grip of the respective rod when set within mortar.
- the helical ribs 4 of the Figure 1 embodiment may be as shown in Figure 1 with two opposed thick ribs 11 alternating with thinner ribs 12; but alternatively the uniform section may be as shown in Figure 6 with four equally circumferential spaced ribs 13 extending from the sides of a square.
- the overall diameter of the rods is such as to enable the rods to be incorporated within a mortar layer of a wall, ie. about 4-8mms in a layer about 8-14mms thick.
- the rods are made from a strong flexible non-corrosive material such as copper or stainless steel so that a rod of the diameter as stated above may hold an outer wall against wind suction and pressure and not corrode after long exposure to the atmosphere or encasement in mortar.
- the wire is merely a uniformly twisted length of triangular cross-section, with a squared-off end.
- rods of the types shown in Figures 2, 3 and 4 may be similarly utilised as well as those described in the preceding paragraph.
- the rods shown in Figures 1-4 can be used as mortar reinforcing rods as shown in Figures 7, 8 and 9.
- a crack as shown at 51 or 52 in Figure 11 can be reinforced by removing about a quarter - say 25mm - into the wall, of the layer of mortar for some distances to each side of the crack, positioning the rod 53 longitudinally between the bricks, and repointing the wall as shown at 54 in Figures 9 and 10.
- Brick lintels can also be reinforced using the above method and by overlapping the rods as at 55, the reinforced bricks can be made to act as beams.
- the inserted reinforcing rods may be long enough to extend through the length of at least 2, and perhaps 3 or 4 bricks, or even 9 bricks as shown in Figure 9.
- the preferred helical rod shown in Figure 1 is conveniently produced from square, rectangular, or round, section austenitic stainless steel wire by a single or double pass rolling-shearing process shown in Figures 5 followed by twisting.
- the rollers 56 and 57 are each approximately 150mm in diameter and each has a rectangular section circumferential groove 58 around its mid portion.
- the very pronounced fins which are required to provide a good anchorage within mortar, are formed by shearing and squeezing the material in the area of A so that it is transferred to the adjacent area of B of the fin.
- the fins become work hardened due to the above process, but the core remains unhardened, thus giving a desirable configuration of hardened fins with good cutting and wear resistant properties, and an unhardened core with good flexibility.
- the space between the rollers 60 and 62 can be adjusted it is possible to alter the fin thickness. Sharpening of the cutting edges 59 of the grooves 58 is possible by use of a grinding stone between the sides of the grooves while the rollers are rotated.
- the bevels 60 can also be sharpened by application of a square grinding stone to the groove away from the common tangential space between the two rollers.
- the groove depths are made to allow for a substantial amount of re-sharpening resulting in a reduction in roller diameter and hence groove depth. Further adjustablility of the rollers can be achieved by dividing them along the line marked x-x so that they may be bolted together with shims inserted, thus enabling the cutting space between the edges to varied, and hence different size wire to be accommodated.
- a single pass would produce a section as shown dotted in Figure 5.
- a second pass with the rod rotated through 90° could produce the four-finned section shown in Figure 6.
- material is cut and squeezed from the original section to the fins.
- Uniform twisting follows to leave a long length of formed wire which can be cut into suitable lengths and cranked as necessary.
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- Architecture (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Chemical & Material Sciences (AREA)
- Acoustics & Sound (AREA)
- Reinforcement Elements For Buildings (AREA)
- Building Environments (AREA)
Description
- This invention relates to the reinforcement of the walls. Reinforcement in this sense includes mainly the stabilisation of existing walls, but can involve new walls in certain circumstances.
- One object of the present invention is to provide a reinforcement system for an existing wall or wall leaf which has cracked or slipped.
- GB-A-2007287 discloses a method of reinforcing a brick wall in which a deep slit is cut into the masonry. In order to prevent collapse, support plugs are located in the slit at intervals. A number of carbon steel wires are then embedded in the slit in an epoxy resin cement.
- It is a further object of the invention to provide a reinforcement system which can use conventional cement and which does not require any support plugs. GB-A-1233175 discloses a dovel-like pin with helical flanges which is intended to be used in connecting two ore more separate structural members always introduced axially.
- According to the present invention, there is provided a method for reinforcing a wall which comprises forming a space in the wall material, locating a structural tie in the space formed and grouting or cementing the tie in position, whereby the maximum diameter of the entire tie being 10mm, characterised in that tie comprises a length of wire preferably of corrosion resistant material including a core and preferably two or more externally projecting fins or ridges, the diameter of the core being 2 to 6mm.
- When used for stabilisation or reinforcement in a brick wall, the length might be up to 1 or 2 metres, or about nine bricks' length.
- The fins or ridges might be about 1 or 2 millimetres proud of the surface of the core or possibly they might be a distance from the core equal to the diameter of the core to leave a substantial flange providing a good grip in the surrounding wall material. However the overall cross section of maximum 10 millimetres is sufficiently small to enable the tie to be inserted in the space left by raking out the mortar in cracked brickwork, after which the wall would be repointed around the inserted reinforcement. A tie (or ties) can easily be introduced into a long line of mortar between several bricks, and if necessary can be bent to extend both vertically and horizontally. The ease with which the tie can be bent is another advantage arising from the small core dimensions and it enables a tie to have two bends so that its two ends are parallel with each other and are joined by an intermediate portion at an angle to the two ends.
- The tie can be easily made using a pair of rollers of novel form. The rollers will have generally cylindrical surfaces with a parallel sided slot at the centre and then as round or square section rod is fed into the nip of the rolls, the section will be first out at the edge of the slots and then deformed so that the cut material is squeezed into the gap between the rollers at their closest point to define a pair of opposed fins. No material is lost but the material is deformed to leave a generally rectangular sectioned core with fins extending from either side, and the section can then be uniformly twisted in a subsequent manufacturing step. This generally forms the subject matter of the present Applicants' EP-A-171250, from which the present Application is divided.
- The method of forming the fins by a combination of shearing and squeezing forces work hardens and stretches the fin material without hardening the core material. This predisposes the material for transformation by twisting into a tight and constant helix without the need for annealing and provides maximum hardness in the fins.
- If the slot is deep enough, wear on the rollers can be easily taken up by adjusting the spacing between them, and in general the width of the fins can be chosen by appropriate setting of the spacing between the rollers.
- A single pass of the rollers can be sufficient to form the desired section, even with a hard metal such as stainless steel. However, a double pass enables four fins to be provided.
- Another possible form of the wire is a triangular section, simply uniformly twisted along its length, with a squared off end. The corner edges of the triangular section will act nearly as well as the fins in embodiments involving embeddment in mortar.
- The invention also provides for the use of a tie to provide tensile reinforcement to improve the performance of structural members made of materials in which a particularly efficient mechanical bond is necessary to transfer the stresses from the material to the reinforcing wire. Such materials may include for example portland cement and/or resin based concretes which are aerated or made with lightweight aggregates and natural organic materials such as timber. The ties may be embedded in some materials as they are cast and with others such as timber may be pressed into grooves cut in their surfaces. Since the wires are made of a corrosion resistant material such as stainless steel they can be used close to the surface of a member exposed to moisture in a corrosive environment.
- The ties can also assist in the transfer of loads from the end of one structural member into another structural member which may be of a dissimilar material.
- The invention may be carried into practice in various ways, and certain embodiments will now be described by way of example with reference to the accompanying drawings of which:-
- Figures 1, 2, 3 and 4 are perspective views showing the configuration of four rods, any of which may be used in accordance with the invention;
- Figure 5 is a sectional elevation illustrating a method of manufacture of a rod of cross section similar to that shown in Figure 1, from a round section bar;
- Figure 6 is a section that can be achieved from the rod of Figure 5;
- Figures 7 and 8 are an elevation and a section of brickwork reinforced by a rod as shown in any of Figures 1 to 4; and
- Figure 9 shows cracks and a lintel in brickwork for which the reinforcement of Figures 9 and 10 is suitable.
- The rod shown in Figure 1 is straight and of constant cruciform cross section, the arms of the cruciform being uniformly twisted about the axis of the rod and forming helical ribs or
fins 4 around the central solid core of the rod. The rod shown in Figure 2 is of constant triangular cross-section and is uniformly twisted with a pitch of approximately twice the maximum cross-sectional dimension of the rod. Figure 3 shows a straight bulbous rod of varying circular cross section, havingannular rings 8 in the form of truncated spheres. Uses of the above described rods as wall ties, and mortar reinforcing bars will be described below, but firstly the important features of each of the types of rod will be outlined. - Figure 4 shows a rod having one end formed with axially arranged flat sections 9 alternately in planes at right angles to their neighbours.
- The
helical ribs 4 of the rod shown in Figure 1 served to provide a strong grip of the rod within mortar over short distances of embedment or penetration; the curves 6 of the rod shown in Figure 2, therings 8 of the rod shown in Figure 3, and the sections 9 in Figure 4, also provide a strong grip of the respective rod when set within mortar. - The
helical ribs 4 of the Figure 1 embodiment may be as shown in Figure 1 with two opposed thick ribs 11 alternating withthinner ribs 12; but alternatively the uniform section may be as shown in Figure 6 with four equally circumferentialspaced ribs 13 extending from the sides of a square. - The bending of the rod about the axes perpendicular to the general axis of the rod of Figure 5 is easier in a direction parallel to the plane of the thicker ribs 11. Therefore since the helix transposes this being axis through one complete revolution per helix pitch, this relatively easy bending of the rod can be achieved in all directions perpendicular to the general axis of the rod, without variation in axial strength at any point along the rod since the cross sectional area of the rod remains constant.
- The overall diameter of the rods is such as to enable the rods to be incorporated within a mortar layer of a wall, ie. about 4-8mms in a layer about 8-14mms thick. The rods are made from a strong flexible non-corrosive material such as copper or stainless steel so that a rod of the diameter as stated above may hold an outer wall against wind suction and pressure and not corrode after long exposure to the atmosphere or encasement in mortar.
- In a simple form of the invention, the wire is merely a uniformly twisted length of triangular cross-section, with a squared-off end.
- Uses of the rod shown in Figure 1 will now be described and it will be appreciated that rods of the types shown in Figures 2, 3 and 4, may be similarly utilised as well as those described in the preceding paragraph.
- The rods shown in Figures 1-4 can be used as mortar reinforcing rods as shown in Figures 7, 8 and 9. A crack as shown at 51 or 52 in Figure 11 can be reinforced by removing about a quarter - say 25mm - into the wall, of the layer of mortar for some distances to each side of the crack, positioning the
rod 53 longitudinally between the bricks, and repointing the wall as shown at 54 in Figures 9 and 10. Brick lintels can also be reinforced using the above method and by overlapping the rods as at 55, the reinforced bricks can be made to act as beams. - The inserted reinforcing rods may be long enough to extend through the length of at least 2, and perhaps 3 or 4 bricks, or even 9 bricks as shown in Figure 9.
- The preferred helical rod shown in Figure 1 is conveniently produced from square, rectangular, or round, section austenitic stainless steel wire by a single or double pass rolling-shearing process shown in Figures 5 followed by twisting. The
rollers circumferential groove 58 around its mid portion. The very pronounced fins, which are required to provide a good anchorage within mortar, are formed by shearing and squeezing the material in the area of A so that it is transferred to the adjacent area of B of the fin. The fins become work hardened due to the above process, but the core remains unhardened, thus giving a desirable configuration of hardened fins with good cutting and wear resistant properties, and an unhardened core with good flexibility. Because the space between therollers 60 and 62 can be adjusted it is possible to alter the fin thickness. Sharpening of thecutting edges 59 of thegrooves 58 is possible by use of a grinding stone between the sides of the grooves while the rollers are rotated. Thebevels 60 can also be sharpened by application of a square grinding stone to the groove away from the common tangential space between the two rollers. The groove depths are made to allow for a substantial amount of re-sharpening resulting in a reduction in roller diameter and hence groove depth. Further adjustablility of the rollers can be achieved by dividing them along the line marked x-x so that they may be bolted together with shims inserted, thus enabling the cutting space between the edges to varied, and hence different size wire to be accommodated. - A single pass would produce a section as shown dotted in Figure 5. A second pass with the rod rotated through 90° could produce the four-finned section shown in Figure 6. In each case material is cut and squeezed from the original section to the fins.
- Uniform twisting follows to leave a long length of formed wire which can be cut into suitable lengths and cranked as necessary.
Claims (10)
- A method for reinforcing a wall which comprises forming a space in the wall material, locating a structural tie (53) in the space formed and grouting or cementing the tie (53) in position, whereby the maximum diameter of the entire tie is 10mm, characterised in that the tie comprises a length of wire (15) of corrosion resistant material including a core and externally projecting fins or ridges (4), the diameter of the core being 2 to 6mm.
- A method as claimed in Claim 1, characterised in that the space is formed in a mortar layer (54).
- A method as claimed in Claim 1 or Claim 2, characterised in that the space is formed as the wall is being built.
- A method as claimed in Claim 1 or Claim 2, characterised in that the space is formed in an existing mortar layer (54).
- A method as claimed in any of Claims 1 to 4, characterised in that the space is formed in a wall spanning a zone of weakness such as a crack (51,52).
- A method as claimed in Claim 5, characterised in that a series of overlapping ties (55) are grouted into the space formed.
- A method as claimed in any preceding Claim, characterised in that the ends of the tie are bent at right angles.
- A method as claimed in any preceding Claim, characterised in that the tie (53) has a substantially uniform cross-section and two or more fins or ridges (4) which follow a continuous helical path about the axis of the core.
- A method as claimed in any preceding Claim, characterised in that the fins or ridges (4) are equiangularly spaced about the core and extend equally from the core in a radial direction.
- A method as claimed in Claim 8 or Claim 9, characterised in that the fins (4) are formed by repositioning material from the wire and subsequently twisting the wire (15).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB848419523A GB8419523D0 (en) | 1984-07-31 | 1984-07-31 | Reinforcements and ties |
GB8419523 | 1984-07-31 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85305405.4 Division | 1985-07-29 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0494099A2 EP0494099A2 (en) | 1992-07-08 |
EP0494099A3 EP0494099A3 (en) | 1992-12-16 |
EP0494099B1 true EP0494099B1 (en) | 1995-07-05 |
Family
ID=10564729
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850305405 Expired EP0171250B1 (en) | 1984-07-31 | 1985-07-29 | Method of making a wall tie and tie made by the method |
EP19920200823 Expired - Lifetime EP0494099B1 (en) | 1984-07-31 | 1985-07-29 | Wall reinforcement |
EP19920200822 Ceased EP0494723A3 (en) | 1984-07-31 | 1985-07-29 | Structural ties |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850305405 Expired EP0171250B1 (en) | 1984-07-31 | 1985-07-29 | Method of making a wall tie and tie made by the method |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920200822 Ceased EP0494723A3 (en) | 1984-07-31 | 1985-07-29 | Structural ties |
Country Status (3)
Country | Link |
---|---|
EP (3) | EP0171250B1 (en) |
DE (2) | DE3588038T2 (en) |
GB (1) | GB8419523D0 (en) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8419523D0 (en) | 1984-07-31 | 1984-09-05 | Ollis W J B | Reinforcements and ties |
GB8704963D0 (en) * | 1987-03-03 | 1987-04-08 | Ollis W J B | Helical pin developments |
GB2206135A (en) * | 1987-06-24 | 1988-12-29 | Clan Contracting Ltd | Cavity wall ties for brick (outer) & timber inner skins |
GB8718310D0 (en) * | 1987-08-03 | 1987-09-09 | Helix Reinforcements Ltd | Wall starter tie |
EP0351668B1 (en) * | 1988-07-15 | 1992-10-14 | Mächtle GmbH | Dowel for façades |
DK162316C (en) * | 1988-09-07 | 1994-12-27 | Tonex V Bjarne Andersen Fa | Wall bindings and tools |
GB2249120B (en) * | 1991-01-26 | 1993-04-07 | Executive Insulation | Structural repair process |
GB2270535B (en) * | 1992-09-14 | 1996-10-09 | William George Edscer | Methods for reinforcing walls and reinforcement for use in such methods |
GB2270937A (en) * | 1992-09-26 | 1994-03-30 | Red Circle Ltd | Cavity wall ties |
WO1995007400A1 (en) * | 1993-09-09 | 1995-03-16 | William George Edscer | Method for reinforcing a cavity wall |
US5586605A (en) * | 1994-02-28 | 1996-12-24 | Helifix Ltd. | Multi-wall tie apparatus |
GB2288842B (en) * | 1994-04-22 | 1998-07-08 | Bruce Anthony Wallace Day | Stitch for brickwork |
DK0741217T3 (en) | 1995-05-02 | 2003-01-27 | Helifix Ltd | Dry fastening system insertion tool |
GB9611641D0 (en) * | 1996-06-04 | 1996-08-07 | Edscer William G | Method of positioning retrospective reinforcement in masonry structures |
US5989713A (en) * | 1996-09-05 | 1999-11-23 | The Regents Of The University Of Michigan | Optimized geometries of fiber reinforcements of cement, ceramic and polymeric based composites |
GB9907993D0 (en) | 1999-04-09 | 1999-06-02 | Knight Keith | Fastener |
GB2357113B (en) * | 1999-12-09 | 2002-07-03 | Elle Van | Post-tensioning of structures |
GB2359109A (en) * | 2000-02-09 | 2001-08-15 | Cheshunt Engineering Ltd | Wall tie |
CZ298844B6 (en) * | 2000-04-14 | 2008-02-20 | Helifix Cz S.R.O. | Additional reinforcing system for repairing wall panel static breakdowns and joints |
DK200000168Y6 (en) * | 2000-05-11 | 2006-11-10 | Arminox As | Wire wall ties |
GB0019786D0 (en) | 2000-08-12 | 2000-09-27 | Ollis William H | Method of manufacturing connecting devices |
WO2006117513A1 (en) * | 2005-04-29 | 2006-11-09 | Kevin Hewson | A masonry reinforcement element |
GB2438854A (en) * | 2006-06-08 | 2007-12-12 | Wallfast Ltd | Wall ties |
GB0612745D0 (en) * | 2006-06-27 | 2006-08-09 | Ollis William H | Impact driven fastener and fastening system |
KR100857930B1 (en) | 2007-03-29 | 2008-09-09 | 이완섭 | Reinforcing rod, reinforcing rod coupler and coupling method thereby |
US8555587B2 (en) | 2010-05-11 | 2013-10-15 | Mitek Holdings, Inc. | Restoration anchoring system |
ITPG20100045A1 (en) * | 2010-08-03 | 2012-02-03 | Kimia S P A | STRUCTURE WITH HIGH RESISTANCE TO CORROSION AND FIRE, ANCHORABLE AND PRETENSIONABLE, FOR THE REINFORCEMENT OF BUILDING COMPONENTS AND RELATIVE ANCHORAGE SYSTEMS |
EP2562318A1 (en) * | 2011-08-23 | 2013-02-27 | NV Bekaert SA | A binding element for a building wall structure |
GB2501462B (en) * | 2012-03-26 | 2016-12-28 | Wallfast Ltd | Structural fixing |
GB201206407D0 (en) * | 2012-04-11 | 2012-05-23 | Excelement Technology Ltd | A method to enhance the ability to make non-magnetic austenitic stainless steel wall ties detectable by an electromagnetic metal detector |
CN108999424A (en) * | 2018-09-28 | 2018-12-14 | 浙江省东阳市横店园林古典建筑公司 | Reinforce the building method of wall body structure intensity |
KR200494608Y1 (en) * | 2021-07-19 | 2021-11-12 | 한덕구 | Screw reinforcing member, connecting cap and screw reinforcing assembly having the same |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB593998A (en) * | 1945-06-22 | 1947-10-30 | Hermann Kirschenbaum | Method for repairing cracks in walls |
FR644030A (en) * | 1927-11-16 | 1928-10-01 | Nailing point improvement | |
FR746537A (en) * | 1932-11-29 | 1933-05-30 | Nail | |
BE511786A (en) * | 1951-06-01 | |||
GB1233175A (en) | 1967-07-10 | 1971-05-26 | ||
CH552732A (en) * | 1972-06-08 | 1974-08-15 | Von Moos Schen Eisenwerke Ag D | REINFORCEMENT BAR FOR REINFORCED CONCRETE. |
DE2603734A1 (en) * | 1976-01-31 | 1977-08-04 | Wilhelm Schwarz | Sheathed ribbed concrete reinforcement rod - has greatest rib height in sections between curve apices |
BE840070A (en) * | 1976-03-26 | 1976-07-16 | WALLWALL AND WALL ANCHOR USED IN THIS | |
GB2007287B (en) * | 1977-10-11 | 1982-04-07 | Pynford Ltd | Structural support |
GB1572953A (en) * | 1978-02-22 | 1980-08-06 | Leedham R | Wall ties for cavity walls of brick and timber construction |
GB2115851A (en) * | 1981-11-19 | 1983-09-14 | Phillips Drill Co | Cavity wall tie |
GB2130327B (en) * | 1982-11-20 | 1986-07-30 | Clan Contracting Ltd | Ties for building structures |
DE8309759U1 (en) * | 1983-04-02 | 1983-08-18 | Knoche, Alfons, 5758 Fröndenberg | WIRE ANCHOR FOR DOUBLE-SHELLED MASONRY |
GB8419523D0 (en) | 1984-07-31 | 1984-09-05 | Ollis W J B | Reinforcements and ties |
-
1984
- 1984-07-31 GB GB848419523A patent/GB8419523D0/en active Pending
-
1985
- 1985-07-29 DE DE19853588038 patent/DE3588038T2/en not_active Expired - Lifetime
- 1985-07-29 EP EP19850305405 patent/EP0171250B1/en not_active Expired
- 1985-07-29 EP EP19920200823 patent/EP0494099B1/en not_active Expired - Lifetime
- 1985-07-29 EP EP19920200822 patent/EP0494723A3/en not_active Ceased
- 1985-07-29 DE DE19853586701 patent/DE3586701T2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0494099A2 (en) | 1992-07-08 |
DE3586701T2 (en) | 1993-04-22 |
DE3588038D1 (en) | 1995-08-10 |
EP0494099A3 (en) | 1992-12-16 |
EP0171250A2 (en) | 1986-02-12 |
GB8419523D0 (en) | 1984-09-05 |
DE3586701D1 (en) | 1992-11-05 |
DE3588038T2 (en) | 1996-04-11 |
EP0171250B1 (en) | 1992-09-30 |
EP0494723A2 (en) | 1992-07-15 |
EP0494723A3 (en) | 1992-12-16 |
EP0171250A3 (en) | 1988-02-24 |
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