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GB2282831A - Post-galvanised steel lintel with different coating densities of zinc - Google Patents

Post-galvanised steel lintel with different coating densities of zinc Download PDF

Info

Publication number
GB2282831A
GB2282831A GB9419876A GB9419876A GB2282831A GB 2282831 A GB2282831 A GB 2282831A GB 9419876 A GB9419876 A GB 9419876A GB 9419876 A GB9419876 A GB 9419876A GB 2282831 A GB2282831 A GB 2282831A
Authority
GB
United Kingdom
Prior art keywords
zinc
lintel
post
galvanised steel
coating
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
GB9419876A
Other versions
GB2282831B (en
GB9419876D0 (en
Inventor
Stephen Bird
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.)
British Steel PLC
Original Assignee
British Steel PLC
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 British Steel PLC filed Critical British Steel PLC
Publication of GB9419876D0 publication Critical patent/GB9419876D0/en
Publication of GB2282831A publication Critical patent/GB2282831A/en
Application granted granted Critical
Publication of GB2282831B publication Critical patent/GB2282831B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/70—Drying or keeping dry, e.g. by air vents
    • E04B1/7038—Evacuating water from cavity walls, e.g. by using weep holes
    • E04B1/7046—Evacuating water from cavity walls, e.g. by using weep holes using trays
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C2003/023—Lintels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0421—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section comprising one single unitary part
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/0434—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the open cross-section free of enclosed cavities
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0473—U- or C-shaped

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Coating With Molten Metal (AREA)

Abstract

A steel lintel is shot-blasted on the more corrosion-liable surfaces 4 prior to zinc dipping, producing a lintel having a heavier zinc coating on those surfaces. <IMAGE>

Description

LINTELS This invention relates to lintels and in particular to the protection of lintels from corrosion.
Lintels are used to carry the loadings on openings in walls, and in particular those for doors and windows. A very popular material for lintels is steel, and generally sheet steel which is bent into an appropriate configuration according to the particular design and requirement for use.
If made out of sheet steel there is a need to protect the lintel from corrosion.
Differing standards apply according to the utilisation of the lintel but for steel lintels having integral damp proof courses BS 5977: part 2: 1983 specifies the protection for post galvanisation. There must be either a mass of zinc of 1420 g/m2, or a mass of 920 g/m2 with additional organic protection on certain faces, these being the faces subject to the greatest corrosion risk. Clearly, coating the whole lintel at 1420 g/m2 wastes zinc by applying it more thickly than necessary on the faces where it is not needed, but, normally, with a single dipping into molten zinc all faces will receive the same coating mass of zinc. It is therefore an object of the present invention to provide a single stage protection of a steel lintel with an economy in the use of zinc.
According to the present invention there is provided a post galvanised steel lintel in which differential coating masses of zinc are applied to different surfaces. The heaviest coating may be applied to the most corrosion vulnerable surfaces. The surfaces having the heavier coating may be shot blasted prior to galvanising. Two different zinc coating masses may be applied to a lintel.
The invention will now be described by way of example and with reference to the accompanying figure which shows in section a typical lintel. Turning to Figure 1 there is shown a lintel 1 of a conventional shape. The outer leaf of the building comprises bricks shown at 2 and the inner leaf construction blocks 3.
The details of the opening below the lintel are not shown since the purpose of the lintel is to carry the weight of the building above it. It is known that the most vulnerable surface of a lintel in use is that diagrammatically marked with the small crosses 4 in the Figure. The protection of lintels by post galvanising is set out among other things in BS 5977: Part 2: 1983. This specifies that for a post galvanised lintel having an integral damp proof system the whole lintel must be coated to 1420g/m2 of zinc or the whole lintel may be coated to 920g/m2 of zinc with additional organic protection for the vulnerable surfaces indicated at 4 in the figure.
This either requires the use of zinc coating levels on the less vulnerable surfaces above those that are really needed or requires the application of organic protection as a separate step. It is known that if a steel surface is shot blasted before galvanising the quantity of zinc remaining on the surface is higher.
Therefore the vulnerable surfaces can be shot blasted before galvanising to the extend necessary to raise the amount of zinc remaining upon them to 1420 g/m2 Then the lintel may be galvanised in one dip and different zinc coating levels applied to different surfaces according to their vulnerability. Clearly, different amounts of shot-blasting can be applied to any given lintel so that any particular zinc coating pattern is achieved. The amount of shot blasting necessary for any particular steel, type of zinc bath and blasting system can easily be detennined by experiment. Thus a minimal amount of zinc required for adequate protection is used without need to resort to organic coverings.

Claims (4)

1 A post galvanised steel lintel having differential coating masses of zinc applied to different surfaces.
2 A post galvanised steel lintel as claimed in claim 1 wherein the heaviest coating is applied to the most corrosion vulnerable surfaces.
3 A post galvanised steel lintel as claimed in either of claims 1 or 2 wherein the surfaces having the heavier coating have been shot blasted prior to galvanising.
4 A post galvanised steel lintel as claimed in any preceding claim in which two levels of zinc coating have been applied.
GB9419876A 1993-10-12 1994-10-03 Lintels Expired - Lifetime GB2282831B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939321011A GB9321011D0 (en) 1993-10-12 1993-10-12 Lintels

Publications (3)

Publication Number Publication Date
GB9419876D0 GB9419876D0 (en) 1994-11-16
GB2282831A true GB2282831A (en) 1995-04-19
GB2282831B GB2282831B (en) 1996-11-20

Family

ID=10743389

Family Applications (2)

Application Number Title Priority Date Filing Date
GB939321011A Pending GB9321011D0 (en) 1993-10-12 1993-10-12 Lintels
GB9419876A Expired - Lifetime GB2282831B (en) 1993-10-12 1994-10-03 Lintels

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB939321011A Pending GB9321011D0 (en) 1993-10-12 1993-10-12 Lintels

Country Status (1)

Country Link
GB (2) GB9321011D0 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2019250A (en) * 1978-03-21 1979-10-31 Hill & Smith Ltd Preparation of metal components for treatment
GB1602124A (en) * 1978-05-30 1981-11-04 Hill & Smith Ltd Assembly of metal components

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2019250A (en) * 1978-03-21 1979-10-31 Hill & Smith Ltd Preparation of metal components for treatment
GB1602124A (en) * 1978-05-30 1981-11-04 Hill & Smith Ltd Assembly of metal components

Also Published As

Publication number Publication date
GB2282831B (en) 1996-11-20
GB9419876D0 (en) 1994-11-16
GB9321011D0 (en) 1993-12-01

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20141002