7720 HARDESON RD BASE FILE 2016-01-01 MF Import

. r;r. Callahan - September 20 Y,e 3 inste.11 pipe on this line and presumaUly complete a simil�.r excavation progr�.m, ln the south�vest corner of the upper level the corner of the existing s1aU has been slightly c�ntilevered end is broken oPf. in the upper level, unchor bolts in the pipe coluu�n fooi;inEs �:iid smoothea concrete be�;rinL surf�:ces for the plates were mislocated requirin�, the repl�,cemenL of ;:nchor �olts with "quick" bolts, the rou�hing out of bearin� surfaces ��;ith a jackhammer znd the use of flowable grout to fill ge.ps unrier the pl�:tes. Une of the pipe columns hes been struck and Uent and �•rill probably require remedial ::ction. iox footings re:ther than a continuous footing were designed to sup- port tiie �:�:.11 p::ne1:3. The position of the footings on Line 13 f::.ils to provide adequ::.te bearin�; £or some of the pa:nels on this line. :.ttempts of the Contractor to rrtend the be�.rin� surface by attachin�* 1-1ates to the £ootin�s h2s beer� inadequ�.te and she��r cr�.ck� are �pp�:rent in the p�:nels affeci�ed, t:riditional support measures wi.11 be required ,;.nd i believe are in the de�ign stc:ge. Line H panels in ornces which �,aere Gne of the panels expensive nist�.ke crane dismissed. the upper level �,�ere tilted up ��nd secured by single too nearly vertic '. to s�fely secure the p�nels. fell end had to t replc.ced, u particul^rly since tilt-up ��orl: ha-d 'ceen completed e.nd the 'rc,S'i L�i�Sluld G.BLLS - post tension of 12.5 }.ipo .is s��ecified in the structural notes for these cables and it is m,y under:tanding that th'�s �mount of tension was placed on the cables on Line 7�y the �ontractor. 'rie �•�are requested to check this tension, but excavution in the lower '�el prevented the Jontr�:ctor for providing us th�t opportunity and t}iis ��ill serve to notify you th�:t this inspection �,as not n:�^Sormed. terh:.ps 1 should �lso point out that t�co of the cables on one of the pil+lsters on tine 7 have been burnt off down to the concrete, apparently without the knowledge of the �uperintendant. ilh� H - 1 have previously reported the absence of bend-outs and dowels on iine H and the inst:�llation of the support plate assemblies shown on 3k- 3 in the pilaste,s in this line. 1 v;ish to c�ll your attention to these items in more detail. 'c,hen i discussed the supnort assemblies initizlly v�ith ;�;r. Smith ufter lea_rning that the Coiitr��.ctor plznned to inst�all Che;:, in the upper lev�l, it �-:e.s my under�-t .ncinq that he i;�:� opposed '., their installa:ti.on on this level. iiowever, he pproved their nst�.11ation epparencly �:f�er receivin�; assurance from the Contr�.ctor that they �+ould be instz:lled er.actly as in the lo�,�er level. Since there �vas no doit�el reinforcement coming out of the footings anc� because the 4 I�o 8's in the bac:.-to-bzck installc,tion in these pilasters ended about three feet above t.he £ootings, �:ith the pilasters completely unreinforced at the bzse, 1 1��as concerned t the load the �lue lc:m be�ms might place on them �nd concerned also a;ith the possibility th�.t. thrus� on these be^ms might crer:te shearin� furces �'� thi � wzrein"urced po,itior. 1•.� ..r.u.th ?ssured me th�.t roulc'. �— J � J