GB2551496A - Anchor rod coupling device - Google Patents

Anchor rod coupling device Download PDF

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Publication number
GB2551496A
GB2551496A GB1610552.0A GB201610552A GB2551496A GB 2551496 A GB2551496 A GB 2551496A GB 201610552 A GB201610552 A GB 201610552A GB 2551496 A GB2551496 A GB 2551496A
Authority
GB
United Kingdom
Prior art keywords
sleeve
anchor rod
coupling device
coupling
anchor
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.)
Granted
Application number
GB1610552.0A
Other versions
GB2551496B (en
GB201610552D0 (en
Inventor
Lee Dennis
James Peter
Paganoni Sara
D'ayala Dina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cintec International Ltd
Original Assignee
Cintec International Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cintec International Ltd filed Critical Cintec International Ltd
Priority to GB1610552.0A priority Critical patent/GB2551496B/en
Publication of GB201610552D0 publication Critical patent/GB201610552D0/en
Publication of GB2551496A publication Critical patent/GB2551496A/en
Application granted granted Critical
Publication of GB2551496B publication Critical patent/GB2551496B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165—Coaxial connection by means of sleeves
    • 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
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • 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
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • 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

Abstract

The anchor rod coupling device 10 comprising a sleeve 11 and a coupling rod having first and second portions 12a, 12b extending from the sleeve for attaching to first and second anchor rods, the coupling rod having a deformable portion 12c between the first and second portions located within the sleeve that has a region non-linear with the first and second portions. The deformable region may be a series of bends, folds or loops 17, 18 which deform or yield when subject to sufficient load from the anchor rods, for example during an earthquake, effectively stretching, shortening or bending the coupling rod, to reduce risk of structure collapse. The sleeve may be a composite cylinder or cuboid with end walls 14a, 14b with apertures 16 through which the coupling rod extends. Channels may be provided in the sleeves for maintaining coupling rods in a plane during deformation. There may be a plurality of coupling rods in different planes within the sleeve.

Description

ANCHOR ROD COUPLING DEVICE
The present invention relates to an anchor rod coupling device for coupling anchor rods which are typically used to reinforce structural parts of buildings, such as walls, and in particular structural parts of old buildings which may otherwise be prone to damage from e.g. earthquakes or ground settlement. A building anchor typically comprises an elongate rod threaded at both ends so that it may be inserted within a hole formed along the length of a wall of a structure such as a building and onto which thrust plates may be then fitted and tightened by nuts to tension the anchor and thereby strengthen the wall against failure. Where the building is generally boxlike two or more such anchors are secured between corners of the building along each wall, thereby considerably stiffening it and decreasing the likelihood of structural failure in the event of an earthquake or other such vibrational event. However, a problem with this known kind of reinforcement is that the anchor rods are so strong relative to the structures in which they are placed that during a severe earthquake or after a series of earth tremors it has been found that they remain in position even when the surrounding wall being reinforced has been caused to move by the tremors such that, typically on the leeward side of the epicentre of an earthquake, such walls are still prone to collapsing outwardly away from the anchors. In addition, the rigidity of the anchors along their major axis does not prevent torsional movement of a target structure within which they are placed, such that cracking of walls can occur diagonally which can also cause great damage even if the building remains upright afterwards. EP1152102, which is the applicants own application, discloses a method of reinforcing a structure such as a wall or a bridge in which a hole is drilled within the structure, a metal reinforcement anchor enclosed within a permeable sock is inserted within the hole and the sock is filled with a cementitious grout. This arrangement allows part of the metal anchor to be exposed at selected parts along its length such that the anchor can move laterally in response to e.g. wall subsidence, without the anchor breaking. Whilst this method of reinforcement is an improvement over prior art anchoring systems which retain their rigidity and hence suffer the risk of breaking laterally, it is unsuitable for use in buildings requiring disguised reinforcement with minimal intrusion such as, in particular, ancient buildings and monuments, where the preferred form of reinforcement is by drilling a relatively small diameter hole along, for example, the length of a wall to be reinforced by means of a steel anchor with thrust plates at each end which may be adjusted to increase or decrease the tension within the anchor to suit the circumstances.
The present invention is derived from the realisation that there exists a need for a building anchor system which retains the advantages of imparting strength and rigidity to building structures, which therefore help to resist damage from relatively minor earthquakes, but which can also non-elastically extend and contract during a major earthquake event so as to prevent or inhibit catastrophic structural failure of the surrounding building structure.
In accordance with the present invention as seen from a first aspect, there is provided an anchor rod coupling device for coupling a first anchor rod with a second anchor rod, the device comprising a sleeve and a coupling rod which extends through the sleeve, the coupling rod comprising a first portion which extends out from a first end of the sleeve for coupling with a first anchor rod, a second portion which extends out from a second end of the sleeve for coupling with a second anchor rod, and a deformable portion intermediate the first and second portion which is disposed within the sleeve, the deformable portion comprising a region which is non-linear with the first and second portion.
In an embodiment, the first, second and deformable portions extend in a common plane.
In an embodiment, the sleeve is arranged to conform the deformation of the deformable portion within the common plane. In this respect, the sleeve minimises any bending or flexing of the deformable portion out of the common plane, as the deformable portion deforms under a compressive or tensile force applied to the first and second portion.
In an embodiment, the sleeve comprises guide means for conforming the deformation of the deformable portion within the common plane. The guide means may comprise at least one linear channel formed along an interior of the sleeve, which extends substantially parallel to a longitudinal axis of the sleeve.
In an embodiment, the region of the deformable portion comprises at least one bend or turned portion of the coupling rod. The region may comprise at least two turned portions. The turned portions may comprise a looped or folded region of the coupling rod for example, which can un-fold to increase the effective length of the coupling rod and thus accommodate any movement in the structure in which the coupling device is installed.
The guide means or channel, for example, is arranged to receive at least a portion of the at least one turned portion and conform the deformation of the deformable portion along a linear direction, within the sleeve. In an embodiment, the guide means comprise at least two linear channels which extend substantially parallel to a longitudinal axis of the sleeve, and which are diametrically opposed within the sleeve.
The or each channel comprises a pair of walls which extend inwardly of the sleeve from an interior surface of the sleeve.
In an embodiment, the sleeve comprises a circular cross-section. The first portion of the coupling rod extends out from the first end of the sleeve, substantially centrally of the first end and the second portion of the coupling rod extends out from the second end of the sleeve, substantially centrally of the second end. In an alternative embodiment, at least one or both of the first and second portions extend out from the first and second end of the sleeve, respectively, from a position which is offset from a centre of the first and second end.
In an embodiment, the anchor rod coupling device comprises a plurality of coupling rods, as described above, which extend through the sleeve. Each coupling rod preferably comprises a first and second portion, and a deformable portion intermediate the respective first and second portion which is disposed within the sleeve. The coupling device further comprises guide means for separately conforming the deformation of the deformable portion of each coupling rod within a plane comprising the first, second and deformable portion of each coupling rod, respectively.
In accordance with the present invention as seen from a second aspect, there is provided a building anchor system comprising a plurality of anchor rods and at least one anchor rod coupling device according to the first aspect.
Whilst the invention has been described above, it extends to any inventive combination of features set out above or in the following description. Although illustrative embodiments of the invention are described in detail herein with reference to the accompanying drawings, it is to be understood that the invention is not limited to these precise embodiments.
Furthermore, it is contemplated that a particular feature described either individually or as part of an embodiment can be combined with other individually described features, or parts of other embodiments, even if the other features and embodiments make no mention of the particular feature. Thus, the invention extends to such specific combinations not already described.
The invention may be performed in various ways, and, by way of example only, embodiments thereof will now be described, reference being made to the accompanying drawings in which:
Figure 1a is a perspective view of an anchor rod coupling device according to an embodiment of the present invention;
Figure 1b is a perspective view of an anchor rod coupling device according to an alternative embodiment of the present invention;
Figure 2 is a longitudinal sectional view through an anchor rod coupling device, according to a first embodiment of the present invention;
Figure 3 is a longitudinal sectional view through an anchor rod coupling device, according to a second embodiment of the present invention;
Figure 4 is a longitudinal sectional view through an anchor rod coupling device, according to a third embodiment of the present invention;
Figure 5 is transverse sectional view through the anchor rod coupling device according to the second embodiment of the present invention; and,
Figure 6 is a transverse sectional view through an anchor rod coupling device according to a fourth embodiment of the present invention comprising two coupling rods.
Referring to figure 1 of the drawings, there is illustrated a perspective view of an anchor rod coupling device 10 according to an embodiment of the present invention for coupling together anchor rods 100a, 100b within a building structure 200. The coupling device 10 is arranged to secure the rods 100a, 100b together while allowing the separation of the rods 100a, 100b to vary when the structure 200 is subject to an external load or force, such as when subjected to the forces of earth tremors.
The coupling device 10 comprises a sleeve 11 which may be formed of a metal, steel or composite material for example, such as Kevlar®, and a coupling rod 12, which may be formed of a metal or steel, for example, which extends through the sleeve. The coupling rod 12 comprises a first portion 12a which extends out from a first end 11a of the sleeve 11 and a second portion 12b which extends out from a second end 11b of the sleeve 11, which is opposite the first end. The coupling rod 12 further comprises a deformable portion 12c disposed within the sleeve 11 which is arranged to deform under the force of an external load applied to the first and second portions 12a, 12b.
The sleeve 11 may comprise a circular cross-sectional shape and a cylindrical side wall 14c, as illustrated in figure 1a of the drawings. Alternatively, the sleeve may comprise a rectangular cross-sectional shape and thus planar side walls 14c as illustrated in figure 1b of the drawings, for example defining a substantially planar cavity therein. The first and second ends 11a, 11b of the sleeve 11 are closed via a respective end wall 14a, 14b, which may comprise a plug or settable sealant for example, and the first and second portions 12a, 12b are arranged to extend out through the respective end wall 14a, 14b via an aperture 15 formed therein. In an embodiment of the invention, as illustrated in figure 1 of the drawings, the apertures 15 are formed substantially centrally of the end walls 14a, 14b, such that the first and second portions 12a, 12b of the coupling rod 12 are aligned along a longitudinal axis 16 of the sleeve 11.
The deformable portion 12c comprises in its simplest form a region which extends between the first and second portions 12a, 12b, which is non-linear with the first and second portions 12a, 12b and thus comprises a longitudinal profile which departs from the axis 15 of the sleeve 11. In a first embodiment, as illustrated in figure 2 for example, the non-linear region comprises a turned region 17 of the coupling rod 12, or a bend or fold in the coupling rod 12, having an apex 18 disposed between the first and second portions 12a, 12b. In a second embodiment, as illustrated in figure 3 of the drawings, the non-linear region comprises at least two turned regions 17 or bends in the coupling rod, forming two apices 18. However, the skilled reader will recognise that any number of bends or turns in the coupling rod 12 may be utilised. The two bends 17 or apices 18 may be formed at one side of the longitudinal axis 15 of the sleeve 11, or at opposite sides of the longitudinal axis 15.
Referring to figure 4 of the drawings, there is illustrated a coupling device 10 according to a third embodiment of the present invention. In this embodiment, at least the first or second portion 12a, 12b of the coupling rod 12 extends out from the respective end wall 14a, 14b of the sleeve 11 through an aperture 15 which is radially offset from the longitudinal axis 16. Furthermore, the apertures 15 formed in the respective end walls 14a, 14b may be radially offset with respect to each other. In this embodiment, the deformable portion 12c may thus comprise a simple arcuate portion 19 of the coupling rod 12 which extends between the first and second coupling portions 12a, 12b, or may comprise any of the above described turned portions 17 or bends, for example.
The first portion 12a, second portion 12b and deformable portion 12c of the coupling rod 12 extend in a common plane and in an embodiment comprising a sleeve having a rectangular cross-section, the side walls 14c of the sleeve 11 are arranged to maintain a planar orientation of the turned portions 17 or bends as the deformable portion 12c deforms under an applied compressive or tensile force. In addition, or in an alternative embodiment in which the sleeve 11 comprises a circular cross-sectional shape, the coupling device 10 further comprises guide means 20 for conforming the deformation of the deformable portion 12c. The guide means 20 may comprise a channel 21 formed along an interior of the sleeve 11 which is arranged to receive at least a portion of the turned portions 17 or bends. In the above described first or third embodiment, in which the deformable portion 12c comprises a single turn 17 or bend, the sleeve 11 may comprises a single channel 21 which extends along an interior of the sleeve 11, substantially parallel to the longitudinal axis 16 of the sleeve 11, as illustrated in figure 5a of the drawings. The channel 21 comprises a pair of side walls 22 which extend away from an internal surface of the sleeve 11, substantially parallel to each other, such that a depth of the channel 21 extends substantially along a radius of the sleeve 11. The channel 21 is arranged to receive at least a portion of the deformable portion 12c to guide the deformation of the rod 12 to within the plane comprising the longitudinal axis 16 and the channel 21.
In the second embodiment of the invention, in which the deformable portion 12c comprises at least two turns 17 or bends, which extend to diametrically opposite sides of the longitudinal axis 16 of the sleeve 11, the guide means 20 comprises two channels 21 formed along an internal surface of the sleeve 11, which are diametrically opposed, as illustrated in figure 5b of the drawings. In this respect, each channel 21 comprises a pair of side walls 22 which extend away from an internal surface of the sleeve 11, substantially parallel to each other. The channels 21 thus face each other owing to their diametric opposition within the sleeve 11, and restrict the movement of the coupling rod 12 to within the plane defined by the channels 21 when subject to an external force. While the above describes the arrangement whereby the channels 21 are diametrically opposed, it is to be appreciate that the channels 21 may face each other at a position which is offset from a diameter of the sleeve 11, such as when facing each other along an arc of the sleeve 11.
In a fourth embodiment of the invention, as illustrated in figure 6 of the drawings, the coupling device 10 comprises a plurality of coupling rods 12, 12’ which extend through the sleeve 11, with the deformable portion 12c, 12c’ of each coupling rod 12, 12’ being disposed within the sleeve 11. In this embodiment, the coupling device 10 comprises two coupling rods 12, 12’, each of which comprises a first and second portion 12a, 12b, 12a’, 12b’ which extend out from the first and second end 11a, 11 b of the sleeve 11, respectively, for coupling with a respective first and second anchor rod (not shown in figure 6) secured within a building structure. At least a portion of the deformable portion 12c, 12c’ of each coupling rod 12, 12’ extends within respective guide means 20, 20’. In this respect, the deformation of the deformable portion 12c, 12c’ of each coupling rod 12, 12’ is restricted by respective guide means 20, 20’, which may comprise the above described channels 21, 2T, so that any deformation occurs in a plane comprising the deformable portion 12c, 12c’ and the respective first and second portion 12a, 12b, 12a’, 12b’. The skilled reader will recognise that the planes may be parallel to each other or antiparallel.
In use of the device 10, the first and second portions 12a, 12b of the coupling rod 12 may be coupled to a first and second anchor rod 100a, 100b respectively, positioned within a building structure 200, by wire ties 13, for example. A cementitious material (not shown) is then placed around the region of the first and second anchor rods 100a, 100b to encase the ties 13, and the cementitious material is then allowed to set to form a rigid coupling between the anchor rods 100a, 100b and the coupling rod 12, and the surrounding building structure 200. In an alternative method, the exposed first and second anchor rods 100a, 100b which extend out from the building structure 200 may be rigidly coupled to the respective portion of the coupling rod 12 via a weld (not shown), for example. In a further alternative, free ends of the coupling rod 12 may comprise threaded connectors (not shown) for threadably coupling the coupling rod 12 with the anchor rods 100a, 100b. However, in both cases, the sleeve 11 is held in free space and are not held restricted by the building structure 200.
In situations where the structure 200 experiences an external force, such as during an earthquake, the anchor rod coupling device 10 and in particular the deformable portion 12c of the coupling rod 12 is arranged to deform under the compressive and/or tensile forces imparted thereon by the anchor rods 100a, 100b as the anchor rods 100a, 100b move with the structure 200. The forces imparted upon the coupling rod 12 cause the effective length of the coupling rod 12, namely the distance between the first and second portions 12a, 12b, to increase or decrease and thus enable the first and second anchor rods 100a, 100b to move relative to each other in accordance with the movement of the structure 200, while maintaining a suitable anchoring of the structure 200.

Claims (23)

1. An anchor rod coupling device for coupling a first anchor rod with a second anchor rod, the device comprising a sleeve and a coupling rod which extends through the sleeve, the coupling rod comprising a first portion which extends out from a first end of the sleeve for coupling with a first anchor rod, a second portion which extends out from a second end of the sleeve for coupling with a second anchor rod, and a deformable portion intermediate the first and second portion which is disposed within the sleeve, the deformable portion comprising a region which is non-linear with the first and second portion.
2. An anchor rod coupling device according to claim 1, wherein the first, second and deformable portions extend in a common plane.
3. An anchor rod coupling device according to claim 2, wherein the sleeve is arranged to conform the deformation of the deformable portion within the common plane.
4. An anchor rod coupling device according to any preceding claim, further comprising guide means for conforming deformation of the deformable portion.
5. An anchor rod coupling device according to claims 2 and 4, wherein the guide means is arranged to conform deformation of the deformable portion within the common plane.
6. An anchor rod coupling device according to claim 4, wherein the guide means comprises at least one channel formed along an interior of the sleeve
7. An anchor rod coupling device according to claim 6, wherein the channel extends substantially parallel to a longitudinal axis of the sleeve.
8. An anchor rod coupling device according to claim 4, wherein the guide means comprise at least two channels
9. An anchor rod coupling device according to claim 8, wherein the at least two channels extend substantially parallel to a longitudinal axis of the sleeve.
10. An anchor rod coupling device according to claim 8 or 9, wherein the at least two channels are diametrically opposed within the sleeve.
11. An anchor rod coupling device according to any preceding claim, wherein the region of the deformable portion comprises at least one bend or turned portion of the coupling rod.
12. An anchor rod coupling device according to any preceding claim, wherein the region comprises at least two turned portions.
13. An anchor rod coupling device according to claim 11 or 12, wherein the turned portion or portions comprise a looped or folded region of the coupling rod, which can deform to increase and decrease an effective length of the coupling rod to accommodate any movement in the structure in which the anchor rod coupling device is installed.
14. An anchor rod coupling device according to any of claims 11 to 13, as appended to claim 4, wherein the guide means is arranged to receive at least a portion of the at least one turned portion.
15. An anchor rod coupling device according to any preceding claim, wherein the sleeve comprises a circular cross-section.
16. An anchor rod coupling device according to any of claims 1 to 15, wherein the sleeve comprises a rectangular cross-section.
17. An anchor rod coupling device according to any preceding claim, wherein the first portion of the coupling rod extends out from the first end of the sleeve and the second portion of the coupling rod extends out from the second end of the sleeve.
18. An anchor rod coupling device according to claim 17, wherein the first portion extends out from the first end of the sleeve, centrally of the first end, and the second portion extends out from the second end of the sleeve, substantially centrally of the second end.
19. An anchor rod coupling device according to any of claims 1 to 17, wherein at least one or both of the first and second portions extend out from the first and second end of the sleeve, respectively, from a position which is offset from a centre of the first and second end.
20. An anchor rod coupling device according to any preceding claim, comprising a plurality of coupling rods which extend through the sleeve.
21. An anchor rod coupling device according to claim 20, wherein each coupling rod comprises a first and second portion, and a deformable portion intermediate the respective first and second portion which is disposed within the sleeve.
22. An anchor rod coupling device according to claim 20 or 21, further comprising guide means for separately conforming the deformation of the deformable portion of each coupling rod within a plane comprising the first, second and deformable portion of each coupling rod, respectively.
23. A building anchor system comprising a plurality of anchor rods and at least one anchor rod coupling device according to any preceding claim for coupling the anchor rods.
GB1610552.0A 2016-06-17 2016-06-17 Anchor rod coupling device Active GB2551496B (en)

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Application Number Priority Date Filing Date Title
GB1610552.0A GB2551496B (en) 2016-06-17 2016-06-17 Anchor rod coupling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1610552.0A GB2551496B (en) 2016-06-17 2016-06-17 Anchor rod coupling device

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GB201610552D0 GB201610552D0 (en) 2016-08-03
GB2551496A true GB2551496A (en) 2017-12-27
GB2551496B GB2551496B (en) 2021-03-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054568A1 (en) * 1998-04-18 1999-10-28 Dee Associates (Business Consultants) Ltd. Fail-safe device
EP1152102A2 (en) * 2000-04-28 2001-11-07 Peter James Improvements relating to reinforcing structures
US20120255243A1 (en) * 2011-04-06 2012-10-11 Liang Kung Jen Seismic coupler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054568A1 (en) * 1998-04-18 1999-10-28 Dee Associates (Business Consultants) Ltd. Fail-safe device
EP1152102A2 (en) * 2000-04-28 2001-11-07 Peter James Improvements relating to reinforcing structures
US20120255243A1 (en) * 2011-04-06 2012-10-11 Liang Kung Jen Seismic coupler

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Publication number Publication date
GB2551496B (en) 2021-03-17
GB201610552D0 (en) 2016-08-03

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