1、Designation:C1244M11(Reapproved 2017)Standard Test Method forConcrete Sewer Manholes by the Negative Air Pressure(Vacuum)Test Prior to Backfill(Metric)1This standard is issued under the fixed designation C1244M;the number immediately following the designation indicates the year oforiginal adoption o
2、r,in the case 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
3、using the 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 in
4、staller to 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 thos
5、e in general use.The test and criteria have been widely andsuccessfully used in testing manholes.NOTE2It should be understood that no correlation has been foundbetween vacuum(air)and hydrostatic tests.1.3 This test method is the companion to inch-pound TestMethod C1244.1.4 This standard does not pur
6、port 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 prior to use.1.5 This international standard was developed in
7、 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 AS
8、TM 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to Concrete Pipe and RelatedProductsC924 Practice for Testing Concrete Pipe Sewer Lines byLow-Pressure Air Test Method(Withdrawn 2013)3C969 Practice for Infiltration and Exfiltration AcceptanceTesting of Installed Precast Concrete Pipe Sewer LinesC1244 Test Me
9、thod for Concrete Sewer Manholes by theNegative Air Pressure(Vacuum)Test Prior to Backfill3.Terminology3.1 For definitions of terms relating to manholes,seeTerminology C822.4.Summary of Practice4.1 All lift holes and any pipes entering the manhole are tobe plugged.Avacuum will be drawn and the vacuu
10、m 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 oftesting.6.Preparation of the Manhole6.1 All lift holes shall be plugged.6.
11、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 onConcrete Pipe and is the direct responsibility of Subcommittee C13.06 on
12、 Manholesand Specials.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1993.Last previous edition approved in 2011 as C1244M 11.DOI:10.1520/C1244M-11R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.o
13、rg.For 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.Un
14、ited 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 Barrier
15、s to 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 33.8 kPa of Hg shall be drawn on themanhole,the valve on the vacuum line of the test head closed,and the vacuum pump shut off.The time
16、 shall be measured forthe vacuum to drop to 30.4 kPa of Hg.7.3 The manhole shall pass if the time for the vacuumreading to drop from 33.8 kPa of Hg to 30.4 kPa of Hg meetsor exceeds the values indicated in Table 1.7.4 If the manhole fails the initial test,necessary repairsshall be made by an approved method.The manhole shall thenbe retested until a satisfactory test is obtained.7.5 Use or failure of this vacuum test shall not precludeacceptance by appropriate water infiltration or exfiltrationte
