GB2280927A - Wall fixing - Google Patents

Wall fixing Download PDF

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Publication number
GB2280927A
GB2280927A GB9416175A GB9416175A GB2280927A GB 2280927 A GB2280927 A GB 2280927A GB 9416175 A GB9416175 A GB 9416175A GB 9416175 A GB9416175 A GB 9416175A GB 2280927 A GB2280927 A GB 2280927A
Authority
GB
United Kingdom
Prior art keywords
wall
threaded portion
wall tie
tie
fastening means
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
GB9416175A
Other versions
GB2280927B (en
GB9416175D0 (en
Inventor
John Ward Mallon
Alan Lang
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.)
ITW Ltd
Original Assignee
ITW 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 ITW Ltd filed Critical ITW Ltd
Publication of GB9416175D0 publication Critical patent/GB9416175D0/en
Publication of GB2280927A publication Critical patent/GB2280927A/en
Application granted granted Critical
Publication of GB2280927B publication Critical patent/GB2280927B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0222Replacing or adding wall ties

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

A wall tie (1) comprises an elongated shank (2) having a first threaded portion (3) at one end, a fastening means (5) at the other end, and a second threaded portion (4) between the first threaded portion (3) and the fastening means (5), the maximum diameter of the first threaded portion (3) is less than the maximum diameter of the second threaded portion (4), and the first threaded portion (3) is shorter than the second threaded portion (4). The fastening means (5) can be in the form of a head which clamps against the outer surface of the wall, can be an expansion-type anchor which expands within a hole in the wall or can be a means which is resin bonded or grouted into the wall. The tie is particularly intended for securing a wall structure to two spaced apart (typically by 300 - 450 mm) wooden joists within a floor or roof and can be inserted without requiring a pilot hole to be drilled through the joists. <IMAGE>

Description

WALL FIXING The present invention relates to a wall tie which is used to secure a wall structure to a wooden structure, for example to a floor or roof.
GB-B-2,130,327 shows a wall tie having an elongated shank with two short similarly threaded portions separated by a longer unthreaded portion. At one end, the tie is provided with an expanding anchorage. To insert the wall tie, a large hole is first drilled through the wall. Then, a long thin drill is used to drill a pilot hole through the wooden structure behind the wall. Typically, this wooden structure includes two wooden joists which may be separated by 300 - 450 mm. The wall tie is then screwed into the joists through the pilot hole, cutting a thread as it is inserted.After the first threaded portion has screwed through the pilot hole in the first joist, the wall tie can be pushed in without requiring any screwing action until either the first threaded portion meets the second joist, or the second threaded portion meets the first joist, at which point the tie must again be screwed in.
There are a number of problems associated with the insertion of these wall ties. As the distance between joists is large, a very long thin drill is required to form the pilot hole through the joists. Such drills are difficult to use. A small diameter drill for a pilot hole is much smaller than the diameter of the hole drilled in the wall to accept the anchor and hence it is difficult to align and centre the pilot hole with the hole for the anchorage. When using such a long drill, a small variation in the angle at which the hole is drilled causes a large vertical displacement of the end where the hole is drilled in the second joist. Therefore, there is a danger that the wall tie is not inserted perpendicularly to the wall as is preferred.Further, after the pilot hole is formed in the wooden substrate, it is difficult to align the end of the wall tie with the hole since the hole in the joist is so remote from the outside of the wall.
According to the present invention, a wall tie comprises an elongated shank having a first threaded portion at one end, a fastening means at the other end, and a second threaded portion between the first threaded portion and the fastening means, wherein the maximum diameter of the first threaded portion is less than the maximum diameter of the second threaded portion, and the first threaded portion is shorter than the second threaded portion.
The fastening means is arranged to secure the wall tie into, or clamp against, the wall which is to be supported.
The fastening means may be in the form of a head which clamps against the outer surface of the wall, may be an expansion type anchor which is arranged to expand within the hole formed in the wall and therefore secure the wall tie to the wall, or be a resin bond or grout securing the wall tie. In this latter case the wall tie may include a mechanical key to improve the bond between the tie and the resin or grout.
The wall tie of the present invention is advantageous as it can be inserted without requiring a pilot hole to be drilled through the joists. The first threaded portion has a small diameter and preferably a gimlet point, and is arranged to be screwed directly into the joist as the wall tie is screwed in. The second threaded portion then enters the hole formed by the first portion and expands it further. This is advantageous over the previous wall ties as there is no problem when trying to line the wall tie up with the pilot hole.
Preferably the first and second threaded portions have the same pitch. Preferably, the first threaded section is substantially the same length as the typical width of a joist, such as between 40 and 50 mm. The first threaded section may have a crest diameter of substantially 6 mm, and the second threaded portion a crest diameter of substantially 8 mm.
Preferably, the wall tie also includes a split guide tube which is used during insertion to ensure that the wall tie is aligned with the hole drilled in the wall. In use a hole is drilled through the wall substantially perpendicular to it and from the outside. The guide tube is inserted into the hole in which it is a slide-in fit and pushed in until it hits the first joist. The wall tie is then pushed through the middle of the tube until it hits the first joist and is then screwed into it. Once it has bitten into the first joist, the split tube is removed before the wall tie is screwed further in and into the second joist. The guide tube aligns the tie with the hole drilled in the wall. This ensures that the wall tie is kept perpendicular to the wall.
An example of a wall tie according to the present invention will be described in accordance with the accompanying drawings, in which Figure 1 shows an example of the wall tie; and, Figure 2 shows an example of a guide tube which may be used to assist the installation of the wall tie of the present invention.
Figure 1 shows a wall tie 1 which has an elongated shank 2. At one end of the shank there is provided a first threaded portion 3. This portion has a maximum diameter of 6 mm, has an 11 TPI thread with a gimlet point and is 43 mm in length. This portion is designed to enter wood without needing a separate pilot hole. The shank 2 also includes a second threaded portion 4 which extends along most of the length of the shank 2. The second threaded portion 4 has the same pitch as that of the first threaded portion 3, but has a larger diameter of 8 mm.
At the other end of the shank 2, there is provided an expansion type anchorage 5, the diameter of which can be increased to secure the wall tie 1 inside a hole through the wall.
To insert the wall tie 1, a hole is first drilled through the wall structure which is to be secured to an underlying wooden structure. This hole is drilled substantially perpendicular to the surface of the wall. A guide tube 6 as shown in Figure 2 is inserted through this hole towards the wooden structure. The guide tube 6 has an internal diameter slightly larger than the maximum diameter of the shank 2 or the crest diameter of the thread 4 of the wall tie. The guide tube 6 is a slide-in fit in the hole and guides the wall tie so that it is aligned with the hole. The wall tie 1 is inserted through the guide tube 6 until the leading end of the first threaded portion 3 comes into contact with the wooden structure.
As shown in Figure 1, the wall tie 1 includes a threaded portion 12 which extends behind the anchorage 5.
The threaded portion 12 is connected to the shank 2. An expanding nut 10 is positioned on the threaded portion 12, and is able to move freely along the threaded portion 12.
A setting nut 9 is threaded onto the threaded portion 12, and is used to expand the anchorage 5 as described below.
The wall tie 1 is screwed in using a threaded collar (not shown) which is provided with an internal thread corresponding to the external thread on the threaded portion 12. The threaded collar is positioned over the threaded portion 12, and the collar is rotated. This is turn rotates the wall tie 1, screwing the wall tie into the wooden structure, with the first threaded portion 3 screwing itself into the wooden structure. As the wall tie 1 is screwed into the wooden structure, the second threaded portion 4 comes into contact with the wooden structure, and is threaded through the pilot hole formed by the first threaded portion 3.
When the second threaded portion 4 is screwed into the wooden structure, the guide tube 6 is pulled out of the hole and its split nature allows it to be removed in spite of the anchorage 5. The tie 1 is then completely screwed in. By using the guide tube 6, the wall tie 1 can be controlled so that it is screwed into the wooden structure substantially perpendicular to the wall.
When the wall tie 1 is fully inserted, the expansion type anchorage 5 is expanded to secure the wall tie 1 to the wall. This is done by tightening a setting nut 9 which is provided on the screw threaded collar 12 which forces an expanding nut 10 into a body 11 of the anchorage 5, thereby forcing the expander to expand, and thereby securing the wall tie to the inside of the hole in the wall.
In an alternative example, the expander 5 may be replaced merely with a head. In this case, as the wall tie 1 is inserted into the wooden structure, the head clamps against the surface of the wall to clamp the wall to the underlying joists. In yet another example, the wall tie can be secured to the wall by injecting a resin or grout into the hole in the wall to bond the tie to the wall. In this case the outer end of the tie preferably includes serrations or corrugations to improve the bond with the resin or grout.

Claims (11)

1. A wall tie comprising an elongated shank having a first threaded portion at one end, a fastening means at the other end, and a second threaded portion between the first threaded portion and the fastening means, wherein the maximum diameter of the first threaded portion is less than the maximum diameter of the second threaded portion, and the first threaded portion is shorter than the second threaded portion.
2. A wall tie according to claim 1, in which the fastening means is arranged to secure the wall tie into, or clamp against, the wall which is to be supported.
3. A wall tie according to claim 1 or 2, in which the fastening means has the form of a head which clamps against the outer surface of the wall.
4. A wall tie according to claim 1 or 2, in which the fastening means is an expansion type anchor which is arranged to expand within the hole formed in the wall and therefore secure the wall tie to the wall.
5. A wall tie according to claim 1 or 2, in which the fastening means is a resin bond or grout securing the wall tie to the wall.
6. A wall tie according to claim 5, in which the wall tie includes a mechanical key.
7. A wall tie according to any one of the preceding claims, in which the first and second threaded portions have the same pitch.
8. A wall tie according to any one of the preceding claims, in which the first threaded section is substantially the same length as the typical width of a joist, such as between 40 and 50 mm.
9. A wall tie according to any one of the preceding claims, in which the first threaded section has a crest diameter of substantially 6 mm, and the second threaded portion has a crest diameter of substantially 8 mm.
10. A wall tie according to any one of the preceding claims, which also includes a split guide tube which is used during insertion to ensure that the wall tie is aligned with the hole drilled in the wall.
11. A wall tie substantially as described with reference to the accompanying drawings.
GB9416175A 1993-08-13 1994-08-10 Wall fixing Expired - Fee Related GB2280927B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939316896A GB9316896D0 (en) 1993-08-13 1993-08-13 Wall fixing

Publications (3)

Publication Number Publication Date
GB9416175D0 GB9416175D0 (en) 1994-09-28
GB2280927A true GB2280927A (en) 1995-02-15
GB2280927B GB2280927B (en) 1996-10-23

Family

ID=10740472

Family Applications (2)

Application Number Title Priority Date Filing Date
GB939316896A Pending GB9316896D0 (en) 1993-08-13 1993-08-13 Wall fixing
GB9416175A Expired - Fee Related GB2280927B (en) 1993-08-13 1994-08-10 Wall fixing

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB939316896A Pending GB9316896D0 (en) 1993-08-13 1993-08-13 Wall fixing

Country Status (1)

Country Link
GB (2) GB9316896D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0741217A1 (en) * 1995-05-02 1996-11-06 Helifix Limited Dry fixing system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130327A (en) * 1982-11-20 1984-05-31 Clan Contracting Ltd Ties for building structures

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130327A (en) * 1982-11-20 1984-05-31 Clan Contracting Ltd Ties for building structures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0741217A1 (en) * 1995-05-02 1996-11-06 Helifix Limited Dry fixing system
EP1057948A3 (en) * 1995-05-02 2001-03-14 Helifix Limited Dry fixing system

Also Published As

Publication number Publication date
GB2280927B (en) 1996-10-23
GB9316896D0 (en) 1993-09-29
GB9416175D0 (en) 1994-09-28

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100810