1、Designation:C124411(Reapproved 2017)Standard Test Method forConcrete Sewer Manholes by the Negative Air Pressure(Vacuum)Test Prior to Backfill1This standard is issued under the fixed designation C1244;the number immediately following the designation indicates the year oforiginal adoption or,in the c
2、ase of revision,the year of last revision.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 test method covers procedures for testing precastconcrete manhole sections when using the
3、vacuum test methodto demonstrate the integrity of the installed materials and theconstruction procedures.This test method is used for testingconcrete manhole sections utilizing mortar,mastic,or gasketedjoints.1.2 This test method is intended to be used as a preliminarytest to enable the installer to
4、 demonstrate the condition of theconcrete manholes prior to backfill.Users are hereby cautionedthat misuse or misapplication of the test criteria containedherein can cause permanent damage to the system being tested.NOTE1Vacuum test criteria presented in this test method are similarto those in gener
5、al use.The test and criteria have been widely andsuccessfully used in testing manholes.NOTE2The user of this test method is advised that no correlation hasbeen found between vacuum(air)and hydrostatic tests.1.3 This test method is the companion to metric TestMethod C1244M;therefore,no SI equivalents
6、 are shown inthis test method.1.4 This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations p
7、rior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization Technical
8、Barriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C822 Terminology Relating to Concrete Pipe and RelatedProductsC924 Practice for Testing Concrete Pipe Sewer Lines byLow-Pressure Air Test Method(Withdrawn 2013)3C969 Practice for Infiltration and Exfiltration AcceptanceTesting
9、 of Installed Precast Concrete Pipe Sewer LinesC1244M Test Method for Concrete Sewer Manholes by theNegative Air Pressure(Vacuum)Test Prior to Backfill(Metric)3.Terminology3.1 For definitions of terms relating to manholes,seeTerminology C822.4.Summary of Practice4.1 All lift holes and any pipes ente
10、ring the manhole are tobe plugged.Avacuum will be drawn and the vacuum drop overa specified time period is used to determine the acceptability ofthe manhole.5.Significance and Use5.1 This is not a routine test.The values recorded areapplicable only to the manhole being tested and at the time oftesti
11、ng.6.Preparation of the Manhole6.1 All lift holes shall be plugged.6.2 All pipes entering the manhole shall be temporarilyplugged,taking care to securely brace the pipes and plugs toprevent them from being drawn into the manhole.1This test method is under the jurisdiction of ASTM Committee C13 onMan
12、holes and Specials.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1993.Last previous edition approved in 2011 as C1244 11.DOI:10.1520/C1244-11R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.Fo
13、r Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United
14、StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to
15、Trade(TBT)Committee.1 7.Procedure7.1 The test head shall be placed at the top of the manholein accordance with the manufacturers recommendations.7.2 A vacuum of 10 in.Hg shall be drawn on the manhole,the valve on the vacuum line of the test head closed,and thevacuum pump shut off.The time shall be m
16、easured for thevacuum to drop to 9 in.Hg.7.3 The manhole is acceptable if the time for the vacuumreading to drop from 10 in.Hg to 9 in.Hg meets or exceeds thevalues indicated in Table 1.7.4 If the manhole fails the initial test,the manhole shall berepaired by an approved method until a satisfactory test isobtained.7.5 Use or failure of this vacuum test shall not precludeacceptance by appropriate water infiltration or exfiltrationtesting,(see Practice C969),or other means.8.Precision and Bias8.1
