1、Designation:C89111Standard Practice forInstallation of Underground Precast Concrete UtilityStructures1This standard is issued under the fixed designation C891;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.
2、A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the procedures to be followed in theplanning,site preparation,and installation of undergroundprecast concrete utilit
3、y structures.Concrete pipe and boxculverts are not covered under this practice.Also,precastconcrete manholes covered in Specification C478 are excludedfrom this practice.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversion
4、s to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and de
5、termine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C478 Specification for Precast Reinforced Concrete Man-hole Sections3.Survey3.1 The installation area shall be surveyed using the work-print and a checklist to identify the work to be done and
6、 todetermine that the plans are correct.3.1.1 The location of the utility structure should be where itwill cause minimum interference with traffic and shall beclearly defined on work prints.3.1.2 All underground facilities and structures such as gas,water,sewer,power,telephone cable,and so forth sha
7、ll belocated and identified.Location markings shall be placed bythe affected utilities before the construction.3.2 The survey shall identify any obstacles such as overheadwires,building structures,and so forth that will interfere withcrane operations,work progress,or create a safety hazard.Precautio
8、nary arrangements shall be made before excavationbegins.3.3 The survey shall give consideration to the soil structureso that proper shoring,sloping,or both,may be planned inadvance of the excavation work.4.Planning4.1 Permits required to do work in accordance with thedetail plans shall be secured be
9、fore starting the job.All permitsor a record of the permits shall be retained on the job forimmediate reference.4.2 All utilities and owners of surface and subsurfacefacilities and structures in the area shall be given advancenotification of proposed excavation.Every effort shall be madeto avoid dam
10、age to the facilities of others.If any damageoccurs,the owner of the damaged facility shall be notifiedimmediately.4.3 Planning shall include the coordination of all respon-sible parties to ensure that arrangements for removal of brokenpavement,rocks,excess spoil,and so forth have been made.Responsi
11、ble parties shall arrange for the delivery,distribution,and storage of required material.If such material cannot bestored on the site,other storage areas must be provided.4.4 Should it appear that a structure location will interferewith traffic,review the situation with the engineer and notifyapprop
12、riate authorities.4.5 Provide for access to call boxes,fire hydrants,etc.5.Safety Requirements5.1 Safety requirements for construction shall be in accor-dance with all federal,state,and local regulations.5.2 The utility structure or any sections that comprise thestructure assembly shall only be lift
13、ed at the lifting points sodesignated by the manufacturer.1This practice is under the jurisdiction of ASTM Committee C27 on PrecastConcrete Products and is the direct responsibility of Subcommittee C27.10 onUtility Structures.Current edition approved Jan.1,2011.Published January 2011.Originallyappro
14、ved in 1978.Last previous edition approved in 2009 as C891 09.DOI:10.1520/C0891-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page on
15、the ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2.1 The weight of each section to be handled shall beclearly indicated by marking of the section or clearly indicatedon the delivery documents.6.Excavating6.1 Coordinate t
16、he various excavation operations from thepoint of opening the pavement to completion of backfill so thatthe work area thus occupied is kept to a minimum consistentwith the conditions governing the work.This is particularlyimportant where an excavation is adjacent to hospitals,policeand fire department buildings,service stations,and so forth.6.2 If unforeseen facilities or obstructions are encountered,stop excavating operations immediately.Expose the obstruc-tions with wood handled digging tools
