1、BRITISH STANDARD Overhead lines - BS EN 61773 : 1997 IEC 61773 : 1996 Inclwling Corrigendum March 1997 Testing of foundations for structures The European Standard EN 61773 : 1996 has the status of a British Standard ICs 29.240.20 NO COPYING WITH STD-BSI BS EN b1773-ENGL 1997 M Lb24bb9 Obb7774 452 BS
2、 EN 61773 : 1997 National foreword This British Standard is the English language version of EN 61773 : 1996. It ic identical with IEC 61773 : 1996 inciudmg Corrigendum March 1997. The CENELEC common modifications have been implemented at the appropriate places in the text and are indicated by a side
3、 line in the margin. The UK parhcipation in its preparation was entrusted to Technical Committee PEW11, Overhead lines, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationaM3uropean committee any enquiries on the interpretation, or propos
4、als for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60
5、000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of the during the change over from one numbering system to the other, publications may contain identifiers fi-om both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Sta
6、ndards norma4ly include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled ?I
7、nternational Standards Correspondence Index?, or by using the ?Find? facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having been prepared under the direction of the Electrotechnic
8、ai Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1997 Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 47, a blank page, an inside back cover and a back cover. Amendments issued
9、since publication I Date I =xt Iffected Amd. No. O BSI 1997 ISBN O 580 28777 7 STD.BSI BS EN bL773-ENGL 1997 1b24bb 0bb7975 379 = EUROPEAN STANDARD NORME EUROPEENNE EUROPISCHE NORM EN 61773 December 1996 ICs 29.240.20 Descriptors: Overhead lines, foundations for structures, soil investigation, beam,
10、 pile English version Overhead lines Testing of foundations for structures (IEC 1 773: 1 996) Lignes ariennes - Essais de fondations des supports (CE1 1 773: 1 996) Freileitungen - Prfung von Grndungen fr Bauwerke (IEC 1 773: 1 996) * u, * This European Standard was approved by CENELEC on 1996-1 0-0
11、1. CENELEC members are bound to comply with the CENICENELEC Internai 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 obtain
12、ed on application to the Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified to the Centra
13、i Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland. Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
14、CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassan 35, B - 1050 Brussels 1996 Copyright reserved to CENELEC members Ref. No. EN 61773:1996 E STD-BSI BS EN
15、 b1773-ENGL 1977 = lb24bb7 Ubb777b 225 Page 2 EN 61773 : 1996 Foreword The text of document 1 1 /111 /FDIS, future edition 1 of IEC 1773, prepared by IEC TC 1 1, Recommendations for overhead lines, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61 773 on 1996-1 0-01
16、, The following dates were fixed: - latest,date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dp) 1997-08-0 - latest date by which the national standards conflicting with the EN have to be withdrawn (daw) 1997-08-0 Annexes
17、 designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annexes A, B, C, D, E and F are informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International
18、 Standard IEC 1773: 1996 was approved by CENELEC as a European Standard without any modification. STD.BSI BS EN b1773-ENGL I777 = Ib24bb9 Obb7977 Lbl m Page 3 EN 61773 : 1996 CONTENTS Clause 1 Scope and object 2 Normative references . 3 Definitions 4 Categories of tests . 4.1 Design tests 5 Geotechn
19、ical data . 5.1 General . 5.2 Soil investigation results 4.2 Proof tests . 5.3 Geotechnical design parameters 5.4 Soil conditions during foundation installation 6 Foundation installation 6.1 General . 6.2 Variations on foundations for design tests 6.3 Installation techniques for foundations subject
20、to design testing 6.4 Installation records 6.5 Minimum period of time required between installation and testing . 7.1 Load application 7 Test equipment . 7.2 Test loading arrangements . 7.3 Reference beam - Design tests . 7.4 Displacement measurement devices - Design tests 7.5 Displacement measureme
21、nt devices - Proof tests 7.6 Calibration of measuring instruments . 8 Test procedure . 8.1 Number of tests . 8.2 Testing of pile groups 8.3 Loading procedure . i . 8.4 Test recording . 9 Test evaluation . 9.1 General . 9.2 Design tests 9.3 Proof tests . Page 5 5 6 6 6 7 8 8 8 8 8 9 9 9 9 10 10 il 11
22、 12 13 13 14 14 21 21 21 22 23 24 24 24 25 O BSI 1997 STD.8SI BS EN bL773-ENGL L797 m Lb24bb Obb7778 OTB W Page 4 EN 61773 : 1996 Clause 10 Acceptance criteria . 10.1 General . 10.2 Design tests 10.3 Proof tests . 11 Test report . Annexes A Bibliography . B Soil investigations . C D E F Comments on
23、clear horizontal distance between reaction supports and test foundation . Formats for records of installation and testing . Guidance notes for graphical determination of foundation uplift or Glossary of terms and explanations compression capacity . ZA (normative) Normative references to internationa
24、l publications with their corresponding European publications . Page 25 25 25 26 26 27 28 31 34 39 44 47 0 BSI 1997 STD.BSI BS EN b2773-ENGL 1777 Lb24bb7 LIbb7779 T34 m Page 5 EN 61773 : 1996 OVERHEAD LINES - TESTING OF FOUNDATIONS FOR STRUCTURES 1 Scope and object This International Standard is app
25、licable to the testing procedures for foundations of overhead line structures. This standard distinguishes between: a) foundations predominantly loaded by axial forces, either in uplift or compression, acting in the direction of the foundation central axis. This applies to foundations of rigid latti
26、ce towers with typical individual footings, that is concrete pad and chimney foundations, steel grillages, concrete piers, piles and grouted anchors. Guy (stay) foundations are included when they are tested in line with their true guy inclinations; b) foundations predominantly loaded by lateral forc
27、es, overturning moments, or a combination of both. This applies to single poles with typical compact foundations, for example monoblock foundations, concrete slabs, concrete piers, piles and poles directly embedded in the ground. it may also apply to H-frame structure foundations for which the predo
28、minant loads are lateral forces, overturning moments, or a combination of both; c) foundations loaded by a combination of forces mentioned under a) and b). Tests on reduced scale or model foundations are not included. However, they may be useful for design purposes. Dynamic foundation testing is exc
29、luded from the scope of this document. The object of this standard is to provide procedures which apply to the investigation of the load- carrying capacity and/or the load response (deflection or rotation) of the total foundation as an interaction between the foundation and the surrounding soil and/
30、or rock. The mechanical strength of the structural components is not within the object of this standard. However, in the case of grouted anchors, the failure of structural components, for example the bond between anchor rod and grout, may predominate. 2 Normative references The following normative d
31、ocuments contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are
32、encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 50(466): 1990, International Electrotechnical Vocabulary (IEV) - Chapter 466: Overhead
33、lines IEC 826: 1991, Loading and strength of overhead transmission lines STD.BS1 BS EN bL773-ENGL 1797 m Lb24bb7 Obb7980 75b m Page 6 EN 61773 : 1996 3 Definitions For the purpose of this International Standard, the following definitions apply. The definitions listed below supplement those given in
34、IEC 50(466). 3.1 characteristic strength: The value guaranteed in appropriate standards. This value is also called the guaranteed strength, the minimum strength, the minimum failing load or the nominal strength and usually corresponds to an exclusion limit, from 2 YO to 5 YO, with 10 % being, in pra
35、ctice, the upper limit (IEC 826, 1.2.1). 3.2 damage or serviceability limit load: The load corresponding to the strength limit of the foundation, which, if exceeded, will lead to damage and noticeable deformation or reduction in strength of the supported structure. The damage load is normally relate
36、d to displacement criteria and may also be known as the serviceability limit load. NOTE - When applying this standard to testing foundations which are designed using deterministic loading criteria, reference to this term may be necessary. 3.3 specific return period of a climatical event, for which t
37、he foundation has been designed. 3.4 failure load: The maximum load which can be applied during testing. It is also known as the limit state failure load and is usually associated with displacements leading to failure of the structure. design load: The limit load or factored working load or the load
38、 derived with respect to a * 3.5 test. maximum proof load: The maximum load applied to the foundation tested during a proof 3.6 tests. test report: Final document summarizing the results of investigations and foundation 3.7 normal working conditions, during the life of the line, with no overload fac
39、tors included. working load: The maximum load likely to be experienced by the foundation under NOTE - The term working load does not apply to limit states design methods and is not compatible with IEC 826. However, when applying this standard to testing foundations which are designed using determini
40、stic loading criteria, reference to this term may be necessary. 4 Categories of tests With respect to the purpose of the test, the level of investigation and the method of execution, this standard refers to two categories of tests: a) design tests; b) proof tests. 4.1 Design tests Design tests are n
41、ormally carried out on specially installed foundations, with one or more of the following objectives: a) to verify design parameters or methodologies; b) to verify construction procedures; Page 7 EN 61773 : 1996 c) to establish geotechnical design parameters and/or a design methodology for a specifi
42、c application; d) to verify compliance of foundation design with specifications; e) to determine the average failure load and coefficient of variation of the design type in specified soil conditions. Tests according to c) and/or d) are also known as type tests. 4.1 . 1 Full scale tests Design tests
43、should preferably be carried out with full scale units. When tests are carried out to verify design parameters, the test foundation shall be as identical as possible to those proposed for production (see 6.1). Design tests are carried out to at least the design load or to failure, especially when te
44、sting according to 4.1 c) and/or 4.1 d), using limit state design. Limitations of displacements, deflection or rotation under load shall be considered where applicable. The level of instrumentation and of investigation should be appropriate for the purpose of the test. 4.1.2 Reduced scale tests In t
45、he case of large dimension foundations, it might be impractical to undertake design tests on a full sire foundation. Design tests on smaller dimension test foundations may be considered, subject to the following conditions: a) the test foundation is installed using the same techniques and materials
46、as the production foundation; b) where necessary, the test foundation is instrumented in such a manner that the base and shaft resistances can be derived separately; c) for foundation types where the capacity is determined by lateral friction, the ratio of the test foundation lateral dimensions to t
47、he production foundation lateral dimensions is not less than 0,5. The depths should be equal. Evaluation of reduced scale tests shall be carried out with great caution, unless the load capacity is based entirely on skin friction (for example piles, caissons or grouted anchors). Great care shall be t
48、aken with areddepth ratios and their absolute values. 4.2 Proof tests These are intended for use during the installation of production foundations to act as a check on the quality of the installation, on the materials being used, and on the absence of any major variations in the assumed geotechnical
49、 design parameters. Proof tests may also be carried out on foundations installed in heterogeneous soil conditions where a wide variation in the foundation load-resistance capacity may be expected. Consistency, speed, economy and effectiveness are the key considerations. Proof tests are taken to a specific percentage of the design load (usually 60 % to 75 %), as stipulated in the contract, but may not exceed the serviceability limit load. Limitations of the displacement shall be considered. The level of instrumentation and investigation may be low, but the reliability of t
