GB2155389A - Producing concrete sewerage liners - Google Patents

Producing concrete sewerage liners Download PDF

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Publication number
GB2155389A
GB2155389A GB08406424A GB8406424A GB2155389A GB 2155389 A GB2155389 A GB 2155389A GB 08406424 A GB08406424 A GB 08406424A GB 8406424 A GB8406424 A GB 8406424A GB 2155389 A GB2155389 A GB 2155389A
Authority
GB
United Kingdom
Prior art keywords
mandrel
fibre reinforced
reinforced concrete
method according
liner
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
GB08406424A
Other versions
GB2155389B (en
GB8406424D0 (en
Inventor
Ian Mccarthy
John Wheatley
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.)
Stanton and Staveley Ltd
Original Assignee
Stanton and Staveley 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 Stanton and Staveley Ltd filed Critical Stanton and Staveley Ltd
Priority to GB08406424A priority Critical patent/GB2155389B/en
Publication of GB8406424D0 publication Critical patent/GB8406424D0/en
Publication of GB2155389A publication Critical patent/GB2155389A/en
Application granted granted Critical
Publication of GB2155389B publication Critical patent/GB2155389B/en
Application status is Expired legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28CPREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/404Pre-treatment of fibres
    • B28C5/406Pre-treatment of fibres and mixing with binding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00Methods or machines specially adapted for the production of tubular articles
    • B28B21/42Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces
    • B28B21/44Methods or machines specially adapted for the production of tubular articles by shaping on or against mandrels or like moulding surfaces by projecting, e.g. spraying
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00Methods or machines specially adapted for the production of tubular articles
    • B28B21/86Cores

Abstract

The method comprises depositing, preferably by spraying, a slurry of fibre reinforced concrete onto a rotating cylindrical mandrel (a) until a continuous layer is formed therearound, physically compacting the layer of fibre reinforced concrete, permitting the layer to harden sufficiently to be self supporting and then applying subsequent layers of fibre reinforced concrete until the required liner wall thickness is attained. Preferably a release agent is first sprayed onto the mandrel and allowed to dry prior to the application of a cementitious mist coat. <IMAGE>

Description

SPECIFICATION Improvements in or relating to sewerage liners This invention relates to sewerage liners and more particularly to the production of such liners from concrete or similar cementitious material, especially from fibre reinforced concrete.

Such liners require to have an internal bore which is smooth to provide good flow characteristics within the sewer whilst the exterior of the liner can be rough and fibrous for the purpose of ensuring a key to exterior grouting after installation.

Such liners are required for lining old or damaged sewers, for example, so as to give the sewer system concerned a new lease of life without the high cost of total replacement of the sewer pipework. The liners have hitherto been made of various suitable materials. One theoretically useable material is fibre reinforced concrete but a difficulty in connection with any proposed use of sewerage liners is that the requirements of a smooth interior with a rough exterior call for the use of an internal mandrel around which the liner is formed, and with fibre reinforced concrete products formation of a pipe about an internal mandrel causes considerable difficulties in ensuring adhesion of a layer of concrete on the mandrel and adhesion between successive layers.

It is an object of the present invention to provide a method of manufacture of such a sewerage liner which overcomes or at least substantially reduces these difficulties.

In accordance with the invention there is provided a method of producing a concrete sewerage liner comprising the steps of depositing a slurry of fibre reinforced concrete on to a rotating cylindrical mandrel until a continuous layer is formed therearound, physically compacting the layer of fibre reinforced concrete, permitting the layer to harden sufficiently to be self supporting and then applying subsequent layers of fibre reinforced conrete until the required liner wall thickness is attained.

We believe that the compacting and maturing of the initial fibrous slurry coating on the mandrel before the application of further layers to be most significant in the satisfactory and successful production of this form of fibre reinforced concrete liner.

The mandrel about which the layers are formed may be mounted for rotation about an axis which may be vertical or horizontal during deposition of the fibre reinforced concrete thereon. The mandrel may be of any desired cross sectional configuration appropriate for the sewer pipework into which it is to be fitted. The cross section of the liner can, in dependence upon the mandrel, be circular, ovoid or of other configuration and can be of any convenient length to the particular sewer pipework requirement.

The mandrel may be longitudinally split and may include wedges to facilitate removal after formation of the fibre reinforced concrete liner. Each liner may be provided with a spigot at one end and a socket at the other adapted to receive a gasket or adhesive seal.

Prior to the application of the first layer of the fibre reinforced concrete slurry, a cementitious mist coat may be applied by spraying on to the mandrel to aid adhesion of the first slurry layer about the mandrel.

In order that the invention may be more readily understood, one embodiment thereof will now be described by way of example with reference to the accompanying drawings in which: Figure I is a diagrammatic representation of apparatus for forming a pipe-like liner in accordance with the invention; Figure 2 is a part sectional side elevation of a liner formed on the mandrel of Figure 1; and Figure 3 is a section on the line AA of Figure 2.

As will be seen, the apparatus comprises a rotatable table 1 on which is mounted a mandrel 2 for rotation about a vertical axis. The mandrel is in two parts 3 and 4 extending longitudinally thereof with a longitudinally removable wedge 5 to enable stripping of the mandrel from the liner after fabrication.

The mandrel 2 is provided at one end with a socket former 6, and at the other end with a thickness ring 7 for enabling assessment of the pipe wall thickness during fabrication.

Glass fibre 8 is supplied from a reel 9 to a combined glass chopping machine 10 and spray nozzle 11. Concrete is supplied to the nozzle 11 by means of a delivery hose 12 from a hopper and pump 13.

In operation, a release agent of known kind is sprayed on the mandrel and allowed to dry. The mandrel is rotated, and an initial cementitious mist coat, having a water/cement ratio of 0.57 + 3% is supplied from the hopper and pump 13 and sprayed on to the mandrel.

Before drying or hardening of this coat a rich cementitious slurry comprising 3 parts cement to 1 part sand together with water such as to give a water/cement ratio of o.33 is prepared and supplied from the hopper and pump 13 to the nozzle 11. At the same time glass fibres are supplied to the chopper 10 where lengths of approximately 38mm are cut and then mixed at the nozzle 11 with the slurry so as to constitute 5% thereof.

After application of one continuous layer of fibrous slurry around the mandrel, the layer in compacted by rolling, which may be by hand held roller, and allowed to mature sufficiently to be self supporting.

A further series of layers of fibrous slurry is then applied to the mandrel until the desired wall thickness of the liner has been attained. After the final layer has been applied the spigot end of the liner is smoothed. After satisfactory maturing of the pipe, the mandrel is collapsed and the liner removed. As can be seen from Figure 2 a typical pipe 14 manufactured by means of the apparatus of Figure 1 is of ovoid cross section (a desired configuration for the flow requirements of sewer pipework) and is provided with a spigot 15 at one end and a socket 16 at the other.

A typical range of sizes of the liner illustrated would be from 500mm by 760mm to 1220mm by 1830mm.

For a liner of 560mm by 220mm we have found that a liner wall thickness of approximately 6mm to be satisfactory, this being applied in three layers for example, the first being between 1 and 3mm's thick. By means of this invention, we have provided an arrangement for producing glass reinforced concrete sewerage pipe-like liner in a manner satisfactorily overcoming the difficulties first above mentioned.

Claims (13)

1. A method of producing a concrete sewerage liner comprising the steps of depositing a slurry of fibre reinforced concrete onto a rotating cylindrical mandrel until a continuous layer is formed therearound, physically compacting the layer of fibre reinforced concrete, permitting the layer to harden sufficiently to be self supporting and then applying subsequent layers of fibre reinforced concrete until the required liner wall thickness is attained.
2. A method according to claim 1 wherein the mandrel is mounted for rotation about a vertical axis during deposition of the fibre reinforced concrete thereon.
3. A method according to claim 1 or 2 wherein a former of ovoid sectional configuration is formed upon a mandrel of corresponding configuration.
4. A method according to any one of the preceding claims wherein the liner is provided with a spigot at one end and a socket at the other adapted to receive a gasket or adhesive seal, by appropriate shaping of the mandrel.
5. A method according to any one of the preceding claims wherein removal of the mandrel is facilitated by utilising a longitudinally split mandrel having removable wedges.
6. A method according to any of the preceding claims wherein a cementitious mist coat is applied by spraying on to the mandrel prior to the application of the first layer of fibre reinforced concrete slurry.
7. A method according to claim 6 wherein a release agent is sprayed on the mandrel and allowed to dry prior to the application of the cementitious mist coat.
8. A method according to any one of the preceding claims wherein successive layers of glass fibre reinforced concrete are deposited on the mandrel.
9. A method according to any one of the preceding claims wherein compaction of the layer of fibre reinforced concrete is by rolling.
10. A method of producing a concrete sewerage liner substantially as hereinbefore described with reference to the accompanying drawings.
11. Apparatus for producing a concrete sewerage liner by means of the method according to any one of the preceding claims.
12. Apparatus for producing a concrete sewerage liner substantially as shown in and as hereinbefore described with reference to the accompanying drawings.
13. A concrete sewerage liner produced by means of a method or an apparatus, as the case may be, according to any one of the preceding claims.
GB08406424A 1984-03-12 1984-03-12 Producing concrete sewerage liners Expired GB2155389B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08406424A GB2155389B (en) 1984-03-12 1984-03-12 Producing concrete sewerage liners

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08406424A GB2155389B (en) 1984-03-12 1984-03-12 Producing concrete sewerage liners

Publications (3)

Publication Number Publication Date
GB8406424D0 GB8406424D0 (en) 1984-04-18
GB2155389A true GB2155389A (en) 1985-09-25
GB2155389B GB2155389B (en) 1987-04-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08406424A Expired GB2155389B (en) 1984-03-12 1984-03-12 Producing concrete sewerage liners

Country Status (1)

Country Link
GB (1) GB2155389B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002301A1 (en) * 1985-10-17 1987-04-23 Alexandre Graevenitz Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby
US4865887A (en) * 1987-05-21 1989-09-12 Oy Lohja Ab Procedure for the production of concrete elements
EP0498637A1 (en) * 1991-02-07 1992-08-12 Costain Building Products Ltd. The manufacture of reinforced concrete sections

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB325211A (en) * 1928-11-09 1930-02-10 Alfred Pullan Wigglesworth Improvements in or relating to the method and apparatus for manufacturing cast pipes, caisson sections and other articles made of cement or other plastic material
GB400200A (en) * 1932-04-11 1933-10-11 Alexander Sanderson Improvements in and relating to moulding articles of concrete or other plastic material
GB1360803A (en) * 1972-04-21 1974-07-24 Nat Res Dev Fibrereinforced articles
GB1389738A (en) * 1972-05-19 1975-04-09 Stelmo Ltd Luckett P R Mobbs J Concrete pipes
GB2088992A (en) * 1980-12-05 1982-06-16 Heidelberger Zement Ag Method of Preparing an Annular Body of a Hydraulically Setting Mass

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB325211A (en) * 1928-11-09 1930-02-10 Alfred Pullan Wigglesworth Improvements in or relating to the method and apparatus for manufacturing cast pipes, caisson sections and other articles made of cement or other plastic material
GB400200A (en) * 1932-04-11 1933-10-11 Alexander Sanderson Improvements in and relating to moulding articles of concrete or other plastic material
GB1360803A (en) * 1972-04-21 1974-07-24 Nat Res Dev Fibrereinforced articles
GB1389738A (en) * 1972-05-19 1975-04-09 Stelmo Ltd Luckett P R Mobbs J Concrete pipes
GB2088992A (en) * 1980-12-05 1982-06-16 Heidelberger Zement Ag Method of Preparing an Annular Body of a Hydraulically Setting Mass

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002301A1 (en) * 1985-10-17 1987-04-23 Alexandre Graevenitz Method and device for fabricating hollow bodies made of continuous fibre-reinforced concrete, and products obtained thereby
US4865887A (en) * 1987-05-21 1989-09-12 Oy Lohja Ab Procedure for the production of concrete elements
EP0498637A1 (en) * 1991-02-07 1992-08-12 Costain Building Products Ltd. The manufacture of reinforced concrete sections
GB2253367A (en) * 1991-02-07 1992-09-09 Costain Building Prod The manufacture of reinforced concrete sections

Also Published As

Publication number Publication date
GB2155389B (en) 1987-04-23
GB8406424D0 (en) 1984-04-18

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PCNP Patent ceased through non-payment of renewal fee