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roto-hammers, masonry & city of LA -Reply[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: roto-hammers, masonry & city of LA -Reply
- From: Tim McCormick <TMCCORMI(--nospam--at)BAS.CI.LA.CA.US>
- Date: Mon, 12 Jan 1998 14:03:26 -0800
Tim at Century West Engineering Corp states: "During conversation with the anchor manufacturer, he stated that the City of LA does not allow the use of impact or roto-hammers on masonry retrofits. -This seems a bit restrictive. Has anyone heard of this? - if so, could you explain why?" The City Of Los Angeles does not permit the use of impact tools on unreinforced masonry because the vibration can reduce the in-plane shear strength. Walls damaged by impact must be retested for shear strength. Damage repair involves repointing to a depth of 1-1/2 inches as needed. By the way, the restriction on impact tools is also in UCBC Appendix 1. It appears as footnote # 5 in Table A-!-E " Drilling for bolts and dowels shall be done with an electric rotary drill. Impact tools shall not be used for drilling holes or tightening anchors and shear bolt nuts."
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