BS 1722-7-2006 Fences - Specification for wooden post and rail fences《栏栅 木柱和栏栅用规范》.pdf

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1、BS 1722-7:2006Fences Part 7: Specification for wooden post and rail fencesICS 91.090NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issue

2、d. BSI 2006ISBN 0 580 49504 3The following BSI references relate to the work on this standard:Committee reference B/201, Fences and GatesDraft for comment DC06/30139501Publication historyFirst published November 1951Second edition April 1963Third edition July 1972Fourth edition October 1986Fifth edi

3、tion March 1999Sixth (present) edition November 2006Amendments issued since publicationAmd. no. Date Text affectedBS 1722-7:2006 BSI 2006 iBS 1722-7:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Dimensions, designation and general characteristics 25 Timber compon

4、ents for sawn post and rail fences 46 Timber components for fences with cleft hardwood rails andsawn, round or cleft posts 57 Other components 98 Installation 99 Statement of Conformity 11AnnexesAnnex A (normative) Timber components 13Annex B (informative) Suggested sampling method for use when meas

5、uring the limiting characteristics of timber 21Annex C (informative) Specifying a wooden post and rail fence 22Bibliography 24List of figuresFigure 1 General characteristics of sawn post and rail fences 3Figure 2 Position and dimensions of side-by-side mortices for cleft rails 7Figure 3 Position and

6、 dimensions of single mortices for cleft rails 8Figure 4 Measurement of girth of cleft posts and rails 8Figure 5 Measurement of girth of cleft posts 9Figure A.1 Knot projection 15Figure A.2 Measurement of wane 16Figure A.3 Measurement of slope of grain 16Figure A.4 Measurement of checks and end shak

7、es 18Figure A.5 Measurement of straightness 19List of tablesTable 1 Designation, dimensions and general characteristics of sawn post and rail fences 2Table 2 Designation, dimensions and general characteristics of morticed sawn or cleft post and cleft rail fences 2Table 3 Determination of moisture co

8、ntent of timber to be treated for use in fencing 4Table 4 Minimum dimensions of side-by-side mortices for cleft rails 7Table 5 Minimum dimensions of single mortices for cleft rails 8Table A.1 Characteristics and defects of sawn softwoods and hardwoods 14Table B.1 Single sampling plan 21Summary of pa

9、gesThis document comprises a front cover, an inside front cover, pages i to iii, a blank page, pages 1 to 24, an inside back cover and a back cover.BS 1722-7:2006ii BSI 2006ForewordPublishing informationThis part of BS 1722 was published by BSI and came into effect on 30 November 2006. It was prepar

10、ed by Technical Committee B/201, Fences and Gates. A list of organizations represented on this committee can be obtained on request to its secretary.SupersessionThis part of BS 1722 supersedes BS 1722-7:1999, which is withdrawn.Relationship with other publicationsBS 1722 is published in parts as fol

11、lows: Part 1: Specification for chain link fences Part 2: Specification for strained wire and wire mesh netting fences Part 4: Specification for cleft chestnut pale fences Part 5: Specification for close-boarded fences and wooden palisade fences Part 7: Specification for wooden post and rail fences

12、Part 8: Specification for mild steel (low carbon steel) continuous bar fences and hurdles Part 9: Specification for mild steel (low carbon steel) fences with round or square verticals and flat horizontals Part 10: Specification for anti-intruder fences in chain link and welded mesh Part 11: Specific

13、ation for prefabricated wood panel fences Part 12: Specification for steel palisade fences Part 13: Specification for chain link fences for tennis court surrounds 1) Part 14: Specification for open mesh steel panel fences Part 16: Specification for organic powder coatings to be used as a plastics fi

14、nish to components and mesh Part 17: Electric security fences. Design, installation and maintenance Specification Part 18: Specification for steel mesh site perimeter temporary fencing systems 2)1)Obsolescent.2)Part 18 is in development and will be published as a Draft for Development (DD). BSI 2006

15、 iiiBS 1722-7:2006Information about this documentThe various parts specify requirements for the types of fence that are considered suitable for standardization. No attempt has been made to standardize fences or gates of a purely decorative nature, nor to specify requirements for “patent” proprietary

16、 fencing systems. It is recommended, however, that such fences or gates should be designed in accordance with the relevant clauses of this part of BS 1722.This is a full revision of the standard, and introduces the following principal changes:a) revised section on preservatives in Annex A;b) scope e

17、xtended to include cleft post and rails;c) minor change to tolerances on size in clauses 5.2.1, 6.4, 6.5;d) revised Annex C, C.3 Construction of fence.It has been assumed in the drafting of this part of BS 1722 that the execution of its provision is entrusted to appropriately qualified and experienc

18、ed people. Before installation commences the Lead Installer should hold a current FISS/CSCS registration card skilled level (blue card) or equivalent and all other operatives should hold the basic fence operative card (green card) or equivalent.At the time of publication of this British Standard the

19、 registration cards are validated by the Joint Fencing Industry Skills Scheme (FISS) and Construction Scheme Skills Certification Scheme (CSCS). FISS/CSCS maintains a national register of fence installers and operatives. There might be other schemes available. Presentational conventionsThe provision

20、s of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Requir

21、ements in this standard are drafted in accordance with The BSI guide to standardization Section 2: Rules for the structure, drafting and presentation of British Standards, subclause 11.3.1, which states, “Requirements should be expressed using wording such as: When tested as described in Annex A, th

22、e product shall .”. This means that only those products that are capable of passing the specified test will be deemed to conform to this standard.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its

23、 correct application.Compliance with a British Standard cannot confer immunity from legal obligations.iv BSI 2006 This page deliberately left blankBS 1722-7:2006 BSI 2006 1BS 1722-7:20061 ScopeThis part of BS 1722 specifies requirements for wooden post and rail fences, using both sawn and cleft comp

24、onents. It includes requirements for the installation of the fencing at the specified location.2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute provisions of this part of this British Standard. For dated references, subseque

25、nt amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies.BS EN ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles Specifications and test methodsBS 957-2, Specification for fe

26、eler gauges Part 2: Metric unitsBS 1202-1, Specification for nails Part 1: Steel nailsBS 4978, Specification for visual strength grading of softwoodBS 8417, Preservation of timber. RecommendationsBS 8500-1:2002, Concrete Complementary British Standard to BS EN 206-1 Part 1: Method of specifying and

27、guidance for the specifier BS 8500-2:2002, Concrete Complementary British Standard to BS EN 206-1 Part 2: Specification for constituent materials and concreteBS EN 335-2, Durability of wood and wood-based products Definition of use classes Part 2: Application to solid wood BS EN 350-2, Durability of

28、 wood and wood-based products Natural durability of solid wood Part 2: Guide to natural durability and treatability of selected wood species of importance in EuropeBS EN 844-9, Round and sawn timber Terminology Part 9: Terms relating to features of sawn timberBS EN 212, Wood preservatives General gu

29、idance on sampling and preparation for analysis of wood preservatives and treated timberBS EN 12620, Aggregates for concrete 3 Terms and definitionsFor the purposes of this part of BS 1722, the terms and definitions given in BS EN 844-9 apply, together with the following.3.1 structural componentsmai

30、n posts and main rails, with the exception of prick posts3.2 non-structural componentsprick postsBS 1722-7:20062 BSI 20064 Dimensions, designation and general characteristics4.1 The dimensions and general characteristics of sawn post and rail fences, and their corresponding designation, shall be as

31、given in Table 1.NOTE Figure 1 shows the general characteristics of sawn post and rail fences. It is not intended to illustrate any particular requirements of this standard.4.2 The dimensions and general characteristics of fences which have morticed sawn or cleft posts and cleft rails, and their cor

32、responding designation, shall be as given in Table 2.Table 1 Designation, dimensions and general characteristics of sawn post and rail fencesFence type designation Height from ground to top of top railLength of main postsLength of prick posts A)Number of rails Spacing between rails at posts, from to

33、p to bottom B)Morticed Nailed mmm mMPR 11/3 SPR 11/3 1.1 1.80 1.60 3 325, 275MPR 11/4 SPR 11/4 1.1 1.80 1.60 4 225, 200, 175MPR 13/4 SPR 13/4 1.3 2.10 1.80 4 250, 250, 225A)Only used in morticed fences.B)See 8.1.3.1 for the relative position of the top rail.Table 2 Designation, dimensions and genera

34、l characteristics of morticed sawn or cleft post and cleft rail fencesFence type designation Height from ground to top of top railLength of main postsNumber of rails Spacing between rails at posts, from top to bottomA)Sawn posts Cleft posts mm mSPCR 105/2 CPCR 105/2 1.05 1.8 2 415SPCR 125/2 CPCR 125

35、/2 1.25 2.1 2 540SPCR 125/3 CPCR 125/3 1.25 2.1 3 323A)See 8.1.3.1 for the relative position of the top rail. BSI 2006 3BS 1722-7:2006Figure 1 General characteristics of sawn post and rail fencesa) Morticed fenceKey1 Main post 3 Rails2 Prick postb) Nailed fenceKey1 Main post2 Joints normally stagger

36、ed 3 Rails1 23123BS 1722-7:20064 BSI 20065 Timber components for sawn post and rail fences5.1 MaterialTimber components shall be of sawn timber conforming to Annex A.NOTE Annex B gives a suggested method of sampling for fence timber.5.2 Tolerances on size5.2.1 The following tolerances apply to the s

37、pecified dimensions:a) length of posts: +250mmb) length of rails: +50mmc) other dimensions:1) specified dimensions 75 mm: 3 mm2) specified dimensions W75 mm: 6 mm5.2.2 A maximum sawing deviation is permitted on 10% of pieces only within a batch, or on 10% of a sample (see Annex B).5.2.3 Moisture con

38、tent shall not exceed 28% when measured with a calibrated moisture meter of the electrical resistance type, fitted with insulated probes that can be hammered into wood to the depth specified in Table 3. When determining the suitability of a charge of timber for preservation, moisture readings shall

39、be made on no fewer than (n/2) separate components, where n is the total number of components in the charge. The components to be measured shall be taken from random positions in the charge. The number of heartwood and sapwood faces sampled shall reflect the relative proportions of these types of wo

40、od in the charge as a whole. If a moisture meter is not used, the oven-dry method of determining moisture content as described in BS EN 212 shall be used. To achieve the recommended moisture content of 28% (m/m) timber shall be either air dried or kiln dried. For either process, fencing timber shall

41、 be debarked and stacked so that air can circulate freely. Kiln drying shall be used if natural drying is unlikely, for example in winter conditions.Table 3 Determination of moisture content of timber to be treated for use in fencingType of timber Length of electrodes within the timberMaximum indica

42、ted moisture content in any sample %a) All sapwood 25 mm, or sapwood thickness if less b) Heartwood of wood speciesother than those listed in c):posts 25 mm 28other components 12 mm c) Heartwood of sweet chestnut,dahoma, danta, guarea, kapur,kempas, oak5 mm BSI 2006 5BS 1722-7:20065.3 Posts5.3.1 Mai

43、n postsThe length of main posts shall be as specified in Table 1. Main posts shall have a cross-section of 75 mm 150 mm, which shall be the same throughout their length. They shall either be cut square across at their base or be pointed for a length not exceeding 225 mm. Posts for morticed fences sh

44、all have mortices of sufficient size to receive the full section of the rail. The mortices shall be cut in the centre of the 150 mm face of the post and spaced as indicated in Table 1.5.3.2 Prick postsThe length of prick posts shall be as given in Table 1.They shall have a cross-section of 38 mm 87

45、mm and shall be pointed for driving.5.4 RailsRails shall have a cross-section of 38 mm 87 mm.6 Timber components for fences with cleft hardwood rails and sawn, round or cleft posts6.1 MaterialAll timber components shall be of material conforming to A.1 and A.3. Sawn timber shall conform also to A.2.

46、6.2 Tolerances on sizeTolerances on the size of sawn timber shall be as specified in 5.2.6.3 Sawn postsThe length of main posts shall be as specified in Table 2. Main posts shall have a cross-section of 75 mm 150 mm, except that, where a single mortice is used, they may have a cross-section of 100 m

47、m 125 mm. The cross-section shall be the same throughout the length of the post. Posts shall either be cut square across at their base or be pointed for a length not exceeding 225 mm. The top mortice shall be set 150 mm down from the top of the post to the top of the mortice. Other rails shall be se

48、t evenly below (see Table 2). The mortices shall be cut in accordance with Figure 2 or Figure 3, as appropriate.BS 1722-7:20066 BSI 20066.4 Round postsThe length of round posts shall be as specified in Table 2. Round posts shall have a girth at ground level of not less than 500 mm and shall maintain

49、 sufficient section to conform to Figure 2 or Figure 3 as appropriate.NOTE Round posts have bark and a considerable sapwood content. This can make them unsuitable for use in ground where rotting is a problem.6.5 Cleft postsThe length of cleft posts shall be as specified in Table 2. Cleft posts shall have a cross-section such that the girth measured at ground level (A