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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 Standard BS EN 641:1995 This British Standard, having been prepared under the direction of the Sector Board for Building and
2、Civil Engineering, was published under the authority of the Standards Board and comes into effect 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 Br
3、itish Standard 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 Bathroo
4、m Council 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 Institu
5、te of Plumbing 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
6、 in the 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 Institut
7、ion of Highways and Transportation Amendments issued since publication Amd. No.DateComments BS EN 641:1995 BSI 07-1999i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 6413 BS EN 641:1995 ii BSI 07-1999 National foreword This British Standard has be
8、en prepared 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 whic
9、h the UK 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
10、pages This document comprises a front cover, an inside front cover, pages i and ii, the EN 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
11、. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 641 October 1994 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,
12、tests English version Reinforced concrete pressures pipes, cylinder type, including joints 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
13、 on 1994-10-26. 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
14、be obtained on 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 Centr
15、al Secretariat 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 United Kingdom. CEN European C
16、ommittee for Standardization 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 E EN 641:1994 BSI 07-1999 2 Foreword This European Standard for concrete pipes is a standard
17、 which was prepared 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
18、 of CEN/TC 164/165/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,
19、 Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 0Introduction3 1Scope3 2Materials3 3Design and fabrication of pipe3 3.1General requirements3 3.1.1General3 3.1.2Wall thickness3 3.2Design of pipe4 3.2.1Reinforced concrete pipe, steel cyclinder type, not preten
20、sioned4 3.2.2Reinforced concrete pipe, steel cyclinder type, pretensioned4 3.3Reinforcement4 3.3.1Circumferential reinforcement4 3.3.2Longitudinal reinforcement5 3.3.3Positioning and cover to steel5 3.4Concrete and mortar5 3.4.1Mix design5 3.4.2Concrete strength5 4Factory testing5 4.1Concrete test5
21、4.2Pipe test5 Annex A (informative) Typical design procedure excluding pretensioned type pipe6 Annex B (informative) Typical design procedure for pretensioned type pipe11 Figure A.1 Bending stress diagram7 Figure A.2 Typical arrangements of pipe reinforcement8 Figure A.3 Stress distribution10 Table
22、1 Minimum design thickness tmin, minimum design thickness of the concrete lining ti,min, including the thickness of the cylinder4 Table B.1 Table of kb values11 EN 641:1994 BSI 07-19993 0 Introduction The product1) in permanent or temporary contact with water, intended for human consumption, shall n
23、ot 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 (EN 639). When the relevant EN dealing with general requirements, such as
24、General requirements for external systems and components (CEN/TC 164/WG 1), Materials in contact with water (CEN/TC 164/WG 3) and Structural design (CEN/TC 164/165/JWG1) are adopted, the current standards shall be revised, where appropriate, in order to ensure that these requirements comply with the
25、se 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 manufacture of reinforced
26、 concrete pressure pipe cylinder type, that is not prestressed, in sizes from DN/ID 250 to DN/ID 4000 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 normally manufactur
27、ed in sizes above DN/ID 1400. 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 load bearing a
28、pplications. 2 Materials Materials are specified in clause 5 of EN 639 (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 and fabrication
29、 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, concentric steel hoops
30、 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 cages both insi
31、de 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 1 shows the minimum design thickness of pipe wall and the minimum design thickness
32、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 diameter shall be m
33、aintained 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. EN 641:1994 4 BSI 07-1999 Table 1 Minimum design thickness tmin, minimum design thickness of the concrete lining ti,min
34、, 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 steel fabric o
35、r 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 than 200 KPa, the cage shall be cir
36、cular 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 be 1,5 mm. The maximum centreline spacing of circumferentials shall be 100 mm. The pipes shall be de
37、signed 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 indica
38、ted 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 wire is
39、 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 stee
40、l 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 spirals
41、. 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 = 9,8 106Di2 2,2 103Di where Di and x are given in mm, Di being the design internal diameter of the pipe. Informative Annex B gives a typical d
42、esign 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 contin
43、uous 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/IDti,min mm tmin mm tmin pretensioned cylinder pipe m
44、m 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 95 100 110 115 125 140 155 165 170 185 195 200 215 220 230 2
45、50 290 40 40 40 45 45 45 45 45 45 50 50 50 50 EN 641:1994 BSI 07-19995 The clear space between circumferential wires shall be not less than 1,25 times the maximum size of the coarse aggregate or 12 mm, whichever is the greater. For pretensioned concrete pressure pipe the circumferential reinforcemen
46、t shall consist of a steel wire directly wound on to the steel cylinder. The wrapping tension shall be not less than 50 MPa, and not greater than 70 MPa. The tensile stress shall be checked during the winding operation. For the pretensioned pipe, a cement slurry shall be projected on to the steel cy
47、linder prior to wrapping of the steel rod reinforcement. This slurry shall consist of 1,2 kg of cement to 1 l of water, and shall be applied at a rate of not less than 1 litre per 2 square metres. 3.3.2 Longitudinal reinforcement The circumferential reinforcement in cages shall be accurately spaced
48、and rigidly 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 cyli
49、nder do 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 than 800 DN/ID; 20 mm for pipe equal to or greater than 800 DN/ID; whichever is the greater. 3.4 Concrete and mortar 3.4.1 Mix design The minimum cement content shall be 300 kg per cubic metre of concrete or mortar. The water cement ratio of the concrete or mortar sha
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