GB2489433A - Cap for head of hold down anchor bolt - Google Patents
Cap for head of hold down anchor bolt Download PDFInfo
- Publication number
- GB2489433A GB2489433A GB1105092.9A GB201105092A GB2489433A GB 2489433 A GB2489433 A GB 2489433A GB 201105092 A GB201105092 A GB 201105092A GB 2489433 A GB2489433 A GB 2489433A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bolt
- head
- cap
- concrete
- hdb
- 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.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 abstract description 13
- 239000010959 steel Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000011120 plywood Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 1
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
- E04B1/4157—Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head
- E04B1/4164—Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head with an adjustment sleeve
-
- 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
- E04B1/4157—Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
Ordinarily, access to the head of a bolt is desirable in order to be able to remove the bolt for maintenance or replacement. In the case of holding down bolts for construction of steel building, however, the bolt is cast into a solid block of concrete, and future access to the bolt head is not required. In this situation though, there is a need to be able to move the bolt slightly in order to provide a degree of tolerance for the steel erection operations to take place. The invention is a cap that allows the head of a Holding Down Bolt (HDB) to move freely, even after the HDB has been encased in concrete, by forming a cavity around the head when the concrete is cast, whilst maintaining the structural integrity of the HDB assembly. The cap is intended to improve the method of work of the installation of HDBs, and provide time and cost savings to the user. The cap may clip over a washer which the bolt passes through.
Description
Description
This invention is intended for use within the Building and Civil Engineering sector. Specifically, it will be used along with Holding Down Bolts' (HDB5). These are bolts which are cast into concrete prior to the erection of a steel framed building. The base plate of the steel column fits over a set of bolts, and the column is then secured using steel washers and nuts (see fig 1).
The traditional method of installing the HDBs is as follows: 1. Cast the bolts into the concrete base (see fig 1).
2. The following day, remove the steel nuts, plywood template and bolt cone, and strike the HDB in order to loosen the bolt head from the concrete surrounding it. The concrete has not yet fully hardened. This allows the bolt to move freely, giving a degree of tolerance to the position of the bolt (see fig 2).
3. Place screwed-up newspaper or rags into the empty space around the bolt in order to try and prevent debris from entering the cone space (see fig 3). This is often unsuccessful, since there can be a time lag of several weeks between casting in the HDBs and the commencement of steel erection. During this time, debris will inevitably become trapped in the space left by the cone.
4. When sufficient bolts have been cast to allow the steel frame erection to commence, remove the rags and erect the steel frame, using the cast-in HDB5.
Using the i-Cap, the sequence of operations becomes as follows: 1. Cast the bolts into the concrete base using the i-Caps (see fig 4).
2. The day before steel erection commences, remove the plywood template and cones. The bolts will move freely, allowing the maximum amount of spatial tolerance to the steel erector.
Thus the use of the i-Cap will negate the need to loosen the bolts the day after a concrete pour, and will also prevent debris from entering the cone simply by allowing the plywood template to be left in position until immediately prior to steel erection. The result will be HDB5 that are allowed to move freely within the cone space, which will speed up the steel erection process.
The i-Cap consists of two parts: a cap, and a washer (see fig 5). The cap prevents concrete from reaching the HDB head, and the washer allows the cap to be fitted to the HDB head.
Key features: 1. The cap clips' onto the washer.
2. The washer pulls the cap up, providing a tight seal to prevent concrete from reaching the bolt head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1105092.9A GB2489433A (en) | 2011-03-27 | 2011-03-27 | Cap for head of hold down anchor bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1105092.9A GB2489433A (en) | 2011-03-27 | 2011-03-27 | Cap for head of hold down anchor bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201105092D0 GB201105092D0 (en) | 2011-05-11 |
| GB2489433A true GB2489433A (en) | 2012-10-03 |
Family
ID=44067410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1105092.9A Withdrawn GB2489433A (en) | 2011-03-27 | 2011-03-27 | Cap for head of hold down anchor bolt |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2489433A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2495390B (en) * | 2011-09-30 | 2018-09-26 | Colin Thomas Ogara | Improvements in and relating to construction |
| GB2608809A (en) * | 2021-07-12 | 2023-01-18 | Richardson James | Bolt assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2403736A (en) * | 2003-07-08 | 2005-01-12 | Saul Tristan Charlton | Shroud for a bolt to be set in concrete |
| GB2412927A (en) * | 2004-04-07 | 2005-10-12 | Satish Karra | A method of providing an insert in a cast body |
-
2011
- 2011-03-27 GB GB1105092.9A patent/GB2489433A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2403736A (en) * | 2003-07-08 | 2005-01-12 | Saul Tristan Charlton | Shroud for a bolt to be set in concrete |
| GB2412927A (en) * | 2004-04-07 | 2005-10-12 | Satish Karra | A method of providing an insert in a cast body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2495390B (en) * | 2011-09-30 | 2018-09-26 | Colin Thomas Ogara | Improvements in and relating to construction |
| GB2608809A (en) * | 2021-07-12 | 2023-01-18 | Richardson James | Bolt assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201105092D0 (en) | 2011-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |