4. HRSR 12-12-2011 - Laserfiche WebLink

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City of Elk River Braun Project BL-i1-6693 November 17, 2011 Page 2 • The girders bear on brick pilasters that are tied into the existing brick wall that was exposed in a couple areas along the wall by removing the interior paneling that was used to finish the space. • It was determined that the brick wall observed from the interior side of the 720 Building is approximately 11 1/2-inches thick and interior face of the common wall on the 724 Building is opposite side of this brick wall. • The wall extends beyond the roof line and forms a parapet along the length of the common wall. • The back 10-foot addition extends above the roof line of the original building. The common wall between the two buildings at this location appears to be comprised of two separate walls with the addition at the 720 Building constructed with concrete masonry units. • There are three chimney conditions along the parapet wall. Two of the chimneys are tied to the common wall construction on the 720 Building side of the common wall. The third chimney is located over the 724 Building and was in use at the time of the site visit. It is assumed the third chimney is for the slow cooker used in the Meat Market and it was observed to be in severe disrepair being held together by wire. Engineering Opinion and Recommendations The condition of the wall observed indicates that the brick wall will need to remain in place as it is the east wall of the 724 Building. Care is needed when removing the roof of the 720 Building since the main girders of this building are bearing on the brick pilasters that are integrated into the wall that is to remain. The following is our general recommendations for the procedures for the demolition of the site: • It is suggested that the demolition of the two buildings (720 and 716) start with the demo of the 720 Building. This is recommended since it appears that the common wall between the 720 Building and the 716 Building may be tied together and to insure that no unwanted stress of the removal of the 716 Building transfers through the 720 Building to the 724 Building. • The interface at the corners of the 724 and 720 Buildings shall be removed manually and taken in 3 to 6-feet from the 724 Building prior to any machine demolition. We suggest this to help prevent damage from occurring at these corners. • The roof framing will need to be removed in stages to limit and prevent unwanted stress from the girders pulling on the brick pilasters and corresponding brick wall. We suggest removing the roof and ceiling rafters first from the respective girders before removing the girder. We suggest a sequence as follows: o Starting from the rear of the structure remove the first 12-feet of the rafters that span from the rear wall to the first girder shall be removed. o Remove the next 12-feet of rafter framing before removal of the girder. o Remove the girder that is now void of any rafter framing. o Proceed to the next rafters and continue the sequence. • The foundation walls that are within 10-feet of the 724 Building shall only be removed to 12- inches below grade. • The concrete slab-on-grade can be removed in its entirety. • The block walls of the 10-foot addition at the rear of the structure can be removed in their entirety. • It is the responsibility of the general contractor doing the demolition to prepare a detailed work plan for approval and coordination prior to starting the work. ~~~~~~~