DISCUSSION OF PROGRESS REPORT ON CULVERT INVESTIGATION

RESEARCH IS BEING CONDUCTED IN IOWA ON THE LOADS ON CONDUITS USED AS DRAINS, SEWERS, AND CULVERTS AND INTO THE SUPPORTING STRENGTHS OF CONDUIT PIPE. FIVE BULLETINS ARE IN PROCESS OF PUBLICATION WHICH WILL GIVE A COMPLETE THEORY OF LOADS ON CONDUITS OR DITCHES PROJECTING INTO EMBANKMENTS, BOTH FROM EMBANKMENT MATERIALS AND FROM CONCENTRATED SUPER LOADS WHETHER STATIC OR MOVING, TOGETHER WITH EXPERIMENTAL AND THEORETICAL DISCUSSION OF THE DIFFERENT SUPPORTING STRENGTHS DEVELOPED IN ACUTAL USE BY RIGID CONDUIT PIPES OF 18 TO 84 INCHES IN DIAMETER. THE LOADING CONDITIONS USUALLY ENCOUNTERED ARE: (1) THE DITCH CONDITION, (2) THE IMPERFECT DITCH CONDITION, (3) THE COMBINED DITCH-PROJECTION CONDITION, (4) THE IMPERFECT PROJECTION CONDITION, AND (5) THE PROJECTION CONDITION. PIPE LAYING CONDITIONS ACTUALLY USED IN BUILDING PIPE CULVERTS ARE CLASSIFIED AS FOLLOWS: (1) THE IMPERMISSIBLE PIPE LAYING CONDITION, (2) THE ORDINARY PIPE LAYING CONDITION, (3) THE FIRST CLASS PIPE LAYING CONDITION, (4) THE CONCRETE CRADLE PIPE LAYING CONDITION. THESE CONDITIONS ARE DEFINED IN THE APPENDIX. THE NET RESULT OF MAKING ALL POSSIBLE RESULTS OF LOADING CONDITIONS AND PIPE LAYING CONDITIONS IS STATED AS FOLLOWS: UNDER THE MOST FAVORABLE CONSTRUCTION CONDITIONS THE LABORATORY TEST STRENGTHS OF A 42 INCH CULVERT PIPE WOULD HAVE TO BE 1,333 PERCENT OF THE LABORATORY STRENGTH REQUIRED UNDER THE MOST FAVORABLE CONSTRUCTION CONDITIONS IN ORDER TO PREVENT CRACKING UNDER THE LOAD IMPOSED BY ANY GIVEN EMBANKMENT TWENTY FEET HIGH.

  • Supplemental Notes:
    • Vol 5, Pt 1, PP 284-291, 1 APP
  • Authors:
    • MARSTON, A
  • Publication Date: 1926

Media Info

  • Monograph Title: Proceedings of the Fifth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 3-4, 1925. Part I: Reports of Research Committees and of Special Investigations
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00204295
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Nov 9 1970 12:00AM