1、BRITISH STANDARD BS EN 641:1995 Reinforced concrete pressure pipes, cylinder type, including joints and fittings The European Standard EN 641:1994 has the status of a British StandardBSEN641:1995 This British Standard, having been prepared under the directionof the Sector Board forBuilding and Civil
2、 Engineering, was published underthe authority of the Standards Board and comes intoeffect on 15 May 1995 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference B/504 Draft for comment 92/12638 DC ISBN 0 580 24115 7 Committees responsible for this British S
3、tandard The preparation of this British Standard was entrusted to Technical Committee B/504, Water supply, upon which the following bodies were represented: Association of Consulting Engineers Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) British Bathroom Counc
4、il British Foundry Association British Non-Ferrous Metals Federation British Plastics Federation British Plumbing Fittings Manufacturers Association Department of the Environment Department of the Environment (Drinking Water Inspectorate) Fibre Cement Manufacturers Association Limited Institute of P
5、lumbing Institution of Water and Environmental Management Local Authority Organizations Scottish Association of Directors of Water and Sewerage Services Water Companies Association Water Research Centre Water Services Association of England and Wales The following bodies were also represented in the
6、 drafting of this standard, through subcommittees and panels: Association of Metropolitan Authorities British Precast Concrete Federation Ltd. Concrete Pipe Association Concrete Society Department of Transport Federation of Civil Engineering Contractors Institution of Civil Engineers Institution of
7、Highways and Transportation Amendments issued since publication Amd. No. Date CommentsBSEN641:1995 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 641 3BSEN641:1995 ii BSI 07-1999 National foreword This British Standard has been prepar
8、ed by Technical Committee B/504, and is the English language version of EN 641 Reinforced concrete pressure pipes, cylinder type, including joints and fittings published by the European Committee for Standardization (CEN). EN 641 was published as a result of international discussion in which the UK
9、took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages Thi
10、s document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 12 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN
11、STANDARD NORME EUROPENNE EUROPISCHE NORM EN641 October1994 ICS 23.040.30; 23.040.50 Descriptors: Water pipelines, pressure pipes, potable water, water pipes, concrete tubes, reinforced concrete, armatures, metal plates, specifications, computation, equipment specifications, dimensions, tests English
12、 version Reinforced concrete pressures pipes, cylinder type, includingjoints and fittings Tuyaux pression en bton arm me en tle, joints et pices spciales compris Stahlbetondruckrohre mit Blechmantel einschlielich Rohrverbindungen und Formstcke This European Standard was approved by CEN on 1994-10-26
13、. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on
14、 application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat
15、 has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for St
16、andardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 641:1994 EEN641:1994 BSI 07-1999 2 Foreword This European Standard for concrete pipes is a standard which was prepar
17、ed by WG 5, Concrete pipes, of the Technical Committee CEN/TC 164, Water supply, the Secretariat of which is held by AFNOR. During preparation of this standard the provisional results already available of CEN/TC 164/WG 1, General requirements for external systems and components, and of CEN/TC 164/16
18、5/JWG 1, Structural design, were considered. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal
19、, Spain, Sweden, Switzerland and UnitedKingdom. Contents Page Foreword 2 0 Introduction 3 1 Scope 3 2 Materials 3 3 Design and fabrication of pipe 3 3.1 General requirements 3 3.1.1 General 3 3.1.2 Wall thickness 3 3.2 Design of pipe 4 3.2.1 Reinforced concrete pipe, steel cyclindertype,not pretensi
20、oned 4 3.2.2 Reinforced concrete pipe, steel cyclindertype,pretensioned 4 3.3 Reinforcement 4 3.3.1 Circumferential reinforcement 4 3.3.2 Longitudinal reinforcement 5 3.3.3 Positioning and cover to steel 5 3.4 Concrete and mortar 5 3.4.1 Mix design 5 3.4.2 Concrete strength 5 4 Factory testing 5 4.1
21、 Concrete test 5 4.2 Pipe test 5 Annex A (informative) Typical design procedureexcluding pretensioned type pipe 6 Annex B (informative) Typical design procedureforpretensioned type pipe 11 Figure A.1 Bending stress diagram 7 Figure A.2 Typical arrangements of pipereinforcement 8 Figure A.3 Stress di
22、stribution 10 Table 1 Minimum design thickness t min , minimum design thickness of the concrete liningt i,min , including the thickness of the cylinder 4 Table B.1 Table of k bvalues 11EN641:1994 BSI 07-1999 3 0 Introduction The product 1)in permanent or temporary contact with water, intended for hu
23、man consumption, shall not adversly affect the quality of the drinking water and shall not contravene the CE Directives and EFTA Regulations on the quality of drinking water. This standard is to be used together with the Common requirements standard (EN639). When the relevant EN dealing with general
24、 requirements, such as General requirements for external systems and components (CEN/TC164/WG1), Materials in contact with water (CEN/TC164/WG3) and Structural design (CEN/TC164/165/JWG1) are adopted, the current standards shall be revised, where appropriate, in order to ensure that these requiremen
25、ts comply with these relevant ENs. To the present standard are attached: Annex A (informative): Typical design procedure excluding pretensioned type pipe; Annex B (informative): Typical design procedure for pretensioned type pipe. 1 Scope This European Standard specifies the requirements and manufac
26、ture of reinforced concrete pressure pipe cylinder type, that is not prestressed, in sizes from DN/ID250 to DN/ID4000 inclusive. Pretensioned concrete cylinder pipe, in which the reinforcement is wrapped, under low tension, directly on to the steel cylinder is covered by this standard and is not nor
27、mally manufactured in sizes above DN/ID1400. Larger sizes can be manufactured based on the concepts of this standard. These types of pipe are designed for the internal pressure, external loads and bedding conditions designated by the purchaser. These types of pipes are also suitable for non-pressure
28、 load bearing applications. 2 Materials Materials are specified in clause5 of EN639 (Common requirements). An additional requirement is specified as follows: the maximum size of the aggregate shall not exceed one third of the concrete wall thickness, on either side of the steel cylinder. 3 Design an
29、d fabrication of pipe 3.1 General requirements 3.1.1 General The pipe shall have the following principal features: a welded steel cylinder with steel joint rings welded to each end; a reinforcing cage or cages, in the form of a continuous helix of steel wire welded on to longitudinal bars, concentri
30、c steel hoops welded on to longitudinal bars, or welded steel fabric; the cage can also be in the form of a steel rod wrapped directly on to the steel cylinder or on to a first concrete layer covering the steel cylinder; a wall of dense concrete covering the steel cylinder and reinforcing cage or ca
31、ges both inside and outside; a joint so designed that it will be watertight under all conditions of service, either using an elastomeric sealing ring or with the steel end rings welded together on site. 3.1.2 Wall thickness Table 1shows the minimum design thickness of pipe wall and the minimum desig
32、n thickness of concrete lining for each type of pipe. Actual design loading conditions may require an increase in wall thickness. At the spigot section of the pipe, the shape of the steel end ring may require the thickness of the lining to be less than that specified in Table 1. The internal diamete
33、r shall be maintained within the tolerance specified by the Common requirements. 1) Should be considered as any product used for the conveyance and distribution of water for human consumption.EN641:1994 4 BSI 07-1999 Table 1 Minimum design thickness t min,minimum design thickness of the concrete lin
34、ing t i,min,including the thickness of the cylinder 3.2 Design of pipe 3.2.1 Reinforced concrete pipe, steel cylinder type, not pretensioned The reinforcement of the pipe shall consist of a welded steel cylinder surrounded by one or more cages fabricated from concentric steel wire hoops, welded stee
35、l fabric or helically wound steel wire properly spaced and supported with longitudinal reinforcing or directly wrapped on to a first concrete layer covering the cylinder. The cages can be either circular or elliptical. In pipes designed for a maximum design pressure of more than200KPa, the cage shal
36、l be circular when the reinforcement consists of one cage only, and the external cage shall be circular when the reinforcement consists of two cages or more. The minimum thickness of the steel cylinder shall be1,5mm. The maximum centreline spacing of circumferentials shall be100mm. The pipes shall b
37、e designed to resist the flexural and hoop stresses, resulting from each of the following conditions: a combination of maximum design pressure and dead loads; a combination of design pressure, dead loads and live loads. Under these given conditions, the tensile stresses of the steel calculated as in
38、dicated in the typical design procedure shown in informative Annex A, shall not be greater than two thirds of the yield strength of the steel. 3.2.2 Reinforced concrete pipe, steel cylinder type, pretensioned The reinforcement of the pipe shall consist of a welded steel cylinder on which a steel wir
39、e is directly wrapped under low tension. The pipe steel content and disposition shall be such that the pipe shall withstand the hydrostatic pressure in both service and transient conditions; the thickness of the steel cylinder, plus the size and pitch of the helixes shall be such that the stress in
40、steel shall not exceed: half of the yield strength of steel when the pipe is subjected to the design pressure; two thirds of the yield strength of steel when the pipe is subjected to the maximum design pressure. The yield strength considered shall be the lower value of the steel cylinder and the spi
41、rals. The increase of the diameter of the pipe at the springline due to external loads is calculated and checked in comparison with a maximum allowable value: x =9,810 6 D i 22,210 3 D i where D iand x are given in mm, D ibeing the design internal diameter of the pipe. Informative Annex B gives a ty
42、pical design procedure for calculating stresses under pressure and deformations of pipe when subjected to external loading. 3.3 Reinforcement 3.3.1 Circumferential reinforcement The circumferential reinforcement shall consist of steel wire hoops with joints butt or lap welded; steel wire formed in a
43、 continuous helix with joints butt or lap welded or welded fabric shaped and lap welded. To ensure quality of joints representative specimens shall be tensile tested during which the strength of the weld shall exceed the strength of the parent steel. DN/ID t i,min mm t min mm t min pretensioned cyli
44、nder pipe mm 250 300 400 500 600 700 800 900 1000 1100 1200 1250 1400 1500 1600 1800 2000 2100 2200 2400 2500 2600 2800 3000 3200 3500 4000 15 15 15 20 20 20 20 20 20 25 25 25 25 25 25 30 40 40 40 45 45 45 45 45 45 50 55 50 50 50 55 60 65 70 75 80 85 95 100 110 115 125 140 155 165 170 185 195 200 21
45、5 220 230 250 290 40 40 40 45 45 45 45 45 45 50 50 50 50EN641:1994 BSI 07-1999 5 The clear space between circumferential wires shall be not less than1,25times the maximum size of the coarse aggregate or12mm, whichever is the greater. For pretensioned concrete pressure pipe the circumferential reinfo
46、rcement shall consist of a steel wire directly wound on to the steel cylinder. The wrapping tension shall be not less than50MPa, and not greater than70MPa. The tensile stress shall be checked during the winding operation. For the pretensioned pipe, a cement slurry shall be projected on to the steel
47、cylinder prior to wrapping of the steel rod reinforcement. This slurry shall consist of1,2kg of cement to1lof water, and shall be applied at a rate of not less than1litre per2square metres. 3.3.2 Longitudinal reinforcement The circumferential reinforcement in cages shall be accurately spaced and rig
48、idly assembled by means of longitudinal bars or wires securely attached so that the cage is maintained in proper shape and position during the casting of the pipe. Reinforcement cages formed by steel wire wrapped directly on to the steel cylinder or on to a concrete layer external to the cylinder do
49、 not require longitudinal bars. 3.3.3 Positioning and cover to steel Reinforcement cages may be circular, elliptical or a combination of both. The minimum cover to steel shall be one times the maximum size of aggregate or: 15 mm for pipe less than800 DN/ID; 20 mm for pipe equal to or greater than800DN/ID; whichever is the greater. 3.4 Concrete and mortar 3.4.1 Mix design The minimum cement content shall be300kg per cubic metre of concrete or mortar. The water cement ratio of the concrete or mortar shall be suitable
