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1、BRITISH STANDARD BS 8301:1985 Reprinted, incorporating Amendments No. 1 and No. 2 Code of practice for Building drainage (Formerly CP 301) UDC 628.6:696.12/.13:628.2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:09:33 GMT+00:00 2006, Uncontrolled Copy, (c)
2、BSI BS 8301:1985 This British Standard, having been prepared under the direction of the Building Services Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 April 1985 BSI 02-1999 First published, as CP 301, February 1950 First revision, as CP 301,
3、 September 1971 Second revision, as BS 8301, April 1985 The following BSI references relate to the work on this standard: Committee reference SEB/12 Draft for comment 76/13530 DC ISBN 0 580 14382 1 Committees responsible for this British Standard The preparation of this British Standard was entruste
4、d by the Building Services Standards Committee (SEB/-) to Technical Committee SEB/12, upon which the following bodies were represented: Association of District Councils British Board of Agrment British Ceramic Research Association British Foundry Association British Plastics Federation British Preca
5、st Concrete Federation Ltd. British Steel Industry Building Employers Confederation Cement and Concrete Association Chartered Institute of Building Clay Pipe Development Association Limited Concrete Pipe Association Department of the Environment (Building Research Establishment) Department of the En
6、vironment for Northern Ireland Department of the Environment (Housing and Construction Industries) Department of the Environment (Property Services Agency) Ductile Iron Producers Association Fibre Cement Manufacturers Association Limited Health and Safety Executive Incorporated Association of Archit
7、ects and Surveyors Institute of Clerks of Works of Great Britain Inc. Institute of Environmental Health Officers Institute of Plumbing Institution of Building Control Officers Institution of Municipal Engineers Institution of Public Health Engineers Institution of Structural Engineers Institution of
8、 Water Engineers and Scientists London Boroughs Association National Coal Board Royal Institute of British Architects Scottish Development Department Union of Construction allied Trades and Technicians Water Authorities Association Amendments issued since publication Amd. no.Date of issueComments 59
9、04September 1988 6580March 1991Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:09:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8301:1985 BSI 02-1999i Contents Page Committees responsibleInside front cover Forewordiii
10、Section 1. General 1Scope1 2Definitions1 3Exchange of information1 4Enactments and official recommendations3 Section 2. Materials and components 5Materials and components4 Section 3. Design 6General design considerations11 7Foul drainage13 8Surface water drainage21 9Combined drainage24 10Groundwater
11、 drainage24 11The structural design of drains26 12Provision of gullies, interceptors and anti-flooding devices30 13Access to drains36 14Ground movement40 15Sewage and surface water lifting installations41 Section 4. Work on site 16Organization47 17Setting out48 18Trenching, excavation and timbering4
12、8 19Alternatives to trench construction50 20Pipe bedding and laying52 21Jointing pipes54 22Prevention of displacement of drains55 23Groundwater drains55 24Connections56 Section 5. Inspection, testing and maintenance 25Inspection and testing of drainage works58 26Maintenance and periodic inspection63
13、 Appendix A Bibliography64 Appendix B Preparation of plans64 Appendix C Background information on the discharge unit method for estimating drain flow rates65 Appendix D Compaction fraction test for suitability of bedding material65 Figure 1 Probability graph for number of appliances discharging simu
14、ltaneously16 Figure 2 Design flows for foul drains: conversion of discharge units to flow rates17 Figure 3 Discharge capacities of drains running full, 3/4 and 2/3 proportional depth: used pipes in good condition (hydraulic roughness, k = 0.6 mm)18 Figure 4 Discharge capacities of drains running ful
15、l, 3/4 and 2/3 proportional depth: used pipes in poor condition (hydraulic roughness, k = 1.5 mm)19 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:09:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8301:1985 ii BSI 02-1999 Page Figure 5 Beddings for rigid p
16、ipes27 Figure 6 Beddings for flexible pipes28 Figure 7 Traditional three chamber petrol interceptor33 Figure 8 Alternative two chamber petrol interceptor (ventilation not shown)34 Figure 9 Concreting of drains laid near foundations51 Table 1 Recommended mixes for buried concrete5 Table 2 Pipe size a
17、s defined in BS 8301 and individual pipe standards6 Table 3 Chemical resistance of materials (for general guidance)8 Table 4 Flow rates, probability of discharge factors and discharge unit ratings14 Table 5 Spacing of branch drains25 Table 6 Limits of cover for rigid pipes laid in trenches of any wi
18、dth32 Table 7 Maximum spacing of access points37 Table 8 Minimum dimensions for rodding eyes, access fittings, inspection chambers and manholes39 Table 9 Recommended acceptance criteria for fall in water level of inspection chambers and manholes61 Index67 Publications referred to70 Licensed Copy: Lo
19、ndon South Bank University, London South Bank University, Fri Dec 08 06:09:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8301:1985 BSI 02-1999iii Foreword This code, prepared under the direction of the Building Services Standards Committee, is a complete revision of CP 301 and supersedes the 1971
20、 edition which is withdrawn. The revision takes into account developments since 1971 in materials used in drainage together with recent advances in drain clearing methods affecting access to pipelines. It emphasizes the need for pipeline flexibility for the avoidance of failure from ground movement
21、and has adopted a computed load method for structural design. The code does not define in legal terms any hard and fast boundary between the drainage systems covered by this code and the sewerage systems covered by CP 2005. It is mainly concerned with pipelines comprising DN 100 and DN 150 pipes but
22、 includes recommendations appropriate for pipes up to about DN 300 which are used in building development. For larger pipework CP 2005 should be consulted and efforts have been made to ensure, where the two codes overlap, that inconsistencies do not occur. The terminology used in describing drainage
23、 has developed over a long period, during which important changes in design, materials and installation techniques have taken place. These have made possible a more rational approach to design, and encouraged simplicity and economy in presentation. Although materials referred to in this code are mai
24、nly traditional and covered by British Standards, the use of new materials and new applications of established materials are not precluded where it can be demonstrated that they are satisfactory for their purpose. As regards the testing of inspection chambers and manholes for watertightness, and the
25、 recommendation of performance criteria for these units, the committee has felt the need for further data and research. These topics will therefore be the subject of continuing work on the committee and appropriate amendments to the text will be made as soon as possible. A British Standard does not
26、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 This document comprises a front cover, an inside fro
27、nt cover, pages i to iv, pages 1 to 70, an inside back cover 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. Licensed Copy: London South Bank University, London So
28、uth Bank University, Fri Dec 08 06:09:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:09:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8301:1985 BSI 02-19991 Section 1. General 1 Scope This code sets o
29、ut recommendations for the design, layout, construction, testing and maintenance of foul, surface water and groundwater drainage systems constructed in the ground under and around buildings, and their connection to sewers, treatment works, cesspools, soakaways or watercourses. The structural design
30、criteria are limited to drains not generally exceeding DN 300, although the other criteria are of general application. NOTEThe titles of the BSI publications referred to in this standard are listed on the inside back cover. References in the text to other publications are identified in the text by n
31、umbers in square brackets, and are listed in Appendix A. 2 Definitions For the purposes of this code the definitions of drainage terms given in BS 892, BS 4118, BS 5572 and BS 6100 apply. Some of these are repeated here for convenience. Other definitions not given in the above standards are included
32、 and these also apply. 2.1 blinding material that will fill the interstices and irregularities in the exposed trench bottom and, when adequately compacted will create a firm uniform formation on which to place the pipe bedding material NOTEHoggin, sand, gravel, all-in aggregate or lean concrete are
33、commonly used. 2.2 branch drain a line of pipes installed to discharge into a junction on another line or at a point of access, i.e. an access junction, inspection chamber or manhole 2.3 branch vent a ventilating pipe connected to one or more branch drains 2.4 discharge unit a unit of flow calculate
34、d for a drainage appliance so that the relative load-producing effect of its discharge can be expressed as a multiple of that unit NOTEThe discharge unit load of an appliance depends on its rate and duration of discharge, the interval between discharges and the chosen criterion of satisfactory servi
35、ce (see 7.4.3.2). It is not a simple multiple of a rate of flow (see BS 5572). 2.5 drop-pipe connection a vertical connection to or near the invert level of a manhole from a sewer or drain at a higher level 2.6 foul water any water contaminated by soil, waste or trade effluent 2.7 junction a fitting
36、 on a pipeline designated to receive discharges from a branch drain(s) 2.8 inspection chamber a covered chamber constructed on a drain or sewer so as to provide access thereto, for inspecting, testing or the clearance and removal of obstructions, and usually situated in areas subjected to light load
37、ing only 2.9 manhole a working chamber with cover constructed on a drain or sewer within which a person may inspect, test or clear and remove obstructions in safety 2.10 nominal size (DN) a numerical designation of the size of a pipe, bend or branch fitting, which is a convenient round number approx
38、imately equal to a manufactured dimension NOTE“Nominal bore” is the approximate internal diameter of a unit as declared by the manufacturer. This quantity is quoted with units (mm) whereas nominal size (DN) is quoted without units. 2.11 storm water rainwater discharged from a catchment area as a res
39、ult of a storm 3 Exchange of information 3.1 General The full exchange of information between all the parties concerned is essential before drainage work is begun. Close liaison should be maintained with all appropriate authorities. In general, the information in 3.2 to 3.10 should be provided. Reco
40、mmendations on the preparation of plans are given in Appendix B. 3.2 From owner or user to designer a) A plan of the site showing existing and proposed levels preferably related to Ordnance Datum, indicating the position and floor levels of the proposed building and the ground levels and contours of
41、 the site, including any proposed regrading. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:09:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8301:1985 2 BSI 02-1999 b) Details of the positions and types of all appliances requiring drainage, the location a
42、nd extent of all paved areas and the position of all existing sanitary pipework, rainwater pipes and gullies. c) The nature of the discharges and the nature and volume of any trade effluents involved. d) The number of occupants and the periods of occupation. 3.3 From sources of technical information
43、 to designer 3.3.1 From the local authority and/or water authority a) Building regulations and other requirements of legislation (see clause 4). b) Whether adequate sewerage is available to receive the proposed discharge(s). c) The conditions under which any trade effluents may be accepted. d) The p
44、osition, size and level of the public sewer(s) and manhole(s). e) The system of sewerage, i.e. separate, partially separate or combined. f) The materials of construction and the condition of the sewer(s). g) Relevant water table levels, flood water levels and their seasonal and other variations. h)
45、Whether interceptors are required. i) The positions and levels at which connections may be made, taking account of surcharge conditions. j) Any relevant local byelaws or further design requirements. k) By whom the connections will be made: if by the authority, the estimated cost; if by the developer
46、 or contractor, the requirements of the authority. l) The limits of responsibility for installation and maintenance. m) Where sewerage is not available a separate system should be designed. The authority should be consulted on their requirements for the storage or treatment of sewage and disposal of
47、 effluent; whether to natural watercourse, ditch or land drainage; also for the disposal of surface water to soakaway, ditch or natural watercourse. n) The physical and chemical nature of the ground to be excavated, particularly as regards the presence of sulphates. The client is responsible for mak
48、ing his own soil survey but the local authority should pass on any relevant local knowledge. 3.3.2 From other authorities a) Highway authority and the police. Requirements as regards drains underpassing roads and reinstatements thereafter. Requirements regarding control and/or diversion of vehicles
49、and pedestrians where drains cross roads or footpaths. b) Local mining authority. Information on subsidence. c) Electricity, gas and water supply authorities. Location of all present and relevant future services. Owners of such services should be given notice of the intention to excavate. Some will possess statutory powers to exact an indemnity against damage to their buried services and to prescribe special precautions against damage during excavation. d) Building owner. Details of any wayleaves negotiated where a drain crosses land in o
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