GB1592266A – Building slabs
– Google Patents
GB1592266A – Building slabs
– Google Patents
Building slabs
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Info
Publication number
GB1592266A
GB1592266A
GB4875777A
GB4875777A
GB1592266A
GB 1592266 A
GB1592266 A
GB 1592266A
GB 4875777 A
GB4875777 A
GB 4875777A
GB 4875777 A
GB4875777 A
GB 4875777A
GB 1592266 A
GB1592266 A
GB 1592266A
Authority
GB
United Kingdom
Prior art keywords
slab
web
layer
fibrous
cementitious material
Prior art date
1978-05-24
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
Application number
GB4875777A
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.)
MARLEY TRIDENT Ltd
Original Assignee
MARLEY TRIDENT 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.)
1978-05-24
Filing date
1978-05-24
Publication date
1981-07-01
1978-05-24
Application filed by MARLEY TRIDENT Ltd
filed
Critical
MARLEY TRIDENT Ltd
1978-05-24
Priority to GB4875777A
priority
Critical
patent/GB1592266A/en
1981-07-01
Publication of GB1592266A
publication
Critical
patent/GB1592266A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
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Classifications
B—PERFORMING OPERATIONS; TRANSPORTING
B28—WORKING CEMENT, CLAY, OR STONE
B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
B28B19/0092—Machines or methods for applying the material to surfaces to form a permanent layer thereon to webs, sheets or the like, e.g. of paper, cardboard
B—PERFORMING OPERATIONS; TRANSPORTING
B28—WORKING CEMENT, CLAY, OR STONE
B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
B28B1/00—Producing shaped prefabricated articles from the material
B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
B—PERFORMING OPERATIONS; TRANSPORTING
B28—WORKING CEMENT, CLAY, OR STONE
B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
B28B23/0006—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects the reinforcement consisting of aligned, non-metal reinforcing elements
Description
(54) BUILDING SLABS
(71) We, MARLEY TRIDENT
LIMITED, a British company of Chantry Lane, Storrington, Sussex (formerly Marley
Homes Limited of Guildford, Surrey
GU3 iLS), do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention is concerned with improvements in building slabs which comprise a compressed mat of fibrous material bonded with a cementitious material. The most common example of this type of slab is a wood wool building slab manufactured in accordance with BS1105 (1972) which comprises a mat of fibrous wood wool bonded and coated with
Portland Cement.
According to the present invention there is provided a method of producing a building slab comprising placing a web of synthetic fibres or filaments against a mould surface, applying to the web a layer of wet fibbrous/ cementitious material, compressing the layer of fibrous/cementitious material against the web to form a slab, allowing the slab to mature, and removing it from the mould surface.
The web of synthetic fibres or filaments forms a reinforcing layer in the building slab and in particular improves the impact resistance of the slab.
In the main embodiment of the process, pressure is also applied to the edges of the maturing slab, as this increases the firmness of the edges and also improves the key between the reinforcing web and the slab material. The increased firmness is especially important when the edges of the slab are used to support the slab, for example when a wood wool building slab is being used for roofing material and the edges of the slabs are supported on rafters.
The improved key between web and slab on the edges is important when the slabs are fixed to a structure at the edges. The key is also important in a subsequent screeding process.
When the matured slab is removed from the mould surface, the face containing the reinforcing web may be covered by a suitable facing screed. This assists in bonding the web to the slab and provides an improved finish.
The nature of the surface layer may be varied depending on the desired finish, for example plaster may be used to provide a fine-faced board. Another suitable material is a bitumen/ sand screed, but the most typical material is a sand/cement screed.
The reinforcing web may be, for example,
in the form of a mesh, net of fabric of syn
thetic fibres or filaments, or a mat of nonwoven synthetic fibres. Suitable materials for the fibres or filaments are polyethylene, poly
ester and nylon. A nylon mesh has been found particularly suitable. The reinforcing web is
intended particularly to improve the impact
resistance of the building slab, and for practical purposes it is desirable that the
reinforcement is selected so that the finished
slab will resist the impact of a weight of 45kg dropped through 1200 mm onto a slab bridg
ing a span of 600 mm.
The accompanying drawing is a schematic
plan view of a pallet board mould used in.
making a building slab by the method of this
invention.
As a typical example, and referring to the
drawings, a length of a synthetic fibre mesh
1, for example a 2in. nylon mesh with a
breaking strength of 54kg., is pulled from a
roll of the mesh (not shown) and laid across
a plywood pallet board 2 which forms the
base of mould for a wood wool building slab.
A wet, loose, wood wool/Portland cement
mixture, formulated to produce a slab in accordance with BSll0S (1972), is spread over
the mesh 1. Side and end edge boards 3,4, are
then dropped on the pallet board 2 and
hydraulically pressed in to the wet slab
material as far as allowed by cut-out portions
5 of the pallet board 1. At the same time
pressure is applied vertically to the faces of
the slab.
The wet slab is subjected to this pressure on its faces, sides and ends for 24 hours until the slab has set. The hardened slab is then removed from the pallet board and subequently, with the face containing the reinforcing web uppermost, is passed under a hopper which feeds cement/sand mortar onto the face of the slab. The mortar is forced under pressure into the interstices of the slab face and reinforcing web and is levelled off by a blade, then allowed to set.
In practice a number of pallet boards 2 each supporting a mesh 1 and layer of wet wood wool/cement are assembled in a stack.
The side and edge boards 3,4 for each pallet board 1 are simultaneously pressed in hydraulically while the stack is also subjected to vertical hydraulic pressure. The stack is clamped to hold the compressed condition and then removed from the hydraulic press to mature for 24 hours while clamped.
WHAT WE CLAIM IS:
1. A method of producing a building slab comprising placing a web of synthetic fibres or filaments against a mould surface, applying to the web a layer of wet fibrous/cementitious material, compressing the layer of fibrous/ cementitious material against the web to form a slab, allowing the slab to mature, and removing it from the mould surface.
2. A method according to Claim 1 in which pressure is also applied to the edges of the layer of fibrous/cementitious material during formation of the slab.
3. A method according to claim 1 or 2 in which the reinforcing web is a mesh, net or fabric of synthetic fibres or filaments, or a mat of non-woven fibres.
4. A method according to Claim 3 in which the reinforcing web is a nylon mesh.
5. A method according to any one of claims 1 to 4, in which the layer of fibrous/cementitious material comprises wood wool and
Portland cement.
6. A method according to any one of Claims 1 to 5 in which the face of the matured slab containing the reinforcing web is coated with a sand/cement screed, a bitumen/sand screed, or plaster.
7. A method according to Claim 1 substantially as described herein with reference to the accompanying drawings.
8. A building slab obtained by a method according to any one of Claims 1 to 7.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
**WARNING** start of CLMS field may overlap end of DESC **. face and reinforcing web and is levelled off by a blade, then allowed to set. In practice a number of pallet boards 2 each supporting a mesh 1 and layer of wet wood wool/cement are assembled in a stack. The side and edge boards 3,4 for each pallet board 1 are simultaneously pressed in hydraulically while the stack is also subjected to vertical hydraulic pressure. The stack is clamped to hold the compressed condition and then removed from the hydraulic press to mature for 24 hours while clamped. WHAT WE CLAIM IS:
1. A method of producing a building slab comprising placing a web of synthetic fibres or filaments against a mould surface, applying to the web a layer of wet fibrous/cementitious material, compressing the layer of fibrous/ cementitious material against the web to form a slab, allowing the slab to mature, and removing it from the mould surface.
2. A method according to Claim 1 in which pressure is also applied to the edges of the layer of fibrous/cementitious material during formation of the slab.
3. A method according to claim 1 or 2 in which the reinforcing web is a mesh, net or fabric of synthetic fibres or filaments, or a mat of non-woven fibres.
4. A method according to Claim 3 in which the reinforcing web is a nylon mesh.
5. A method according to any one of claims 1 to 4, in which the layer of fibrous/cementitious material comprises wood wool and
Portland cement.
6. A method according to any one of Claims 1 to 5 in which the face of the matured slab containing the reinforcing web is coated with a sand/cement screed, a bitumen/sand screed, or plaster.
7. A method according to Claim 1 substantially as described herein with reference to the accompanying drawings.
8. A building slab obtained by a method according to any one of Claims 1 to 7.
GB4875777A
1978-05-24
1978-05-24
Building slabs
Expired
GB1592266A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB4875777A
GB1592266A
(en)
1978-05-24
1978-05-24
Building slabs
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB4875777A
GB1592266A
(en)
1978-05-24
1978-05-24
Building slabs
Publications (1)
Publication Number
Publication Date
GB1592266A
true
GB1592266A
(en)
1981-07-01
Family
ID=10449802
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4875777A
Expired
GB1592266A
(en)
1978-05-24
1978-05-24
Building slabs
Country Status (1)
Country
Link
GB
(1)
GB1592266A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1993022118A1
(en)
*
1992-05-04
1993-11-11
Helmut Meister
Method of manufacturing a lightweight square or plate-shaped component
WO2001081056A1
(en)
*
2000-04-27
2001-11-01
Mura Imre Jr
Reinforced particle board and method for manufacturing thereof
1978
1978-05-24
GB
GB4875777A
patent/GB1592266A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1993022118A1
(en)
*
1992-05-04
1993-11-11
Helmut Meister
Method of manufacturing a lightweight square or plate-shaped component
WO2001081056A1
(en)
*
2000-04-27
2001-11-01
Mura Imre Jr
Reinforced particle board and method for manufacturing thereof
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Legal Events
Date
Code
Title
Description
1981-09-16
PS
Patent sealed
1984-02-08
PCNP
Patent ceased through non-payment of renewal fee
