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Home My WebLink AboutB14-0390 Structural letter (2) CORRECTIONS REQ'D J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS 1775 Sherman Street, Ste. 2000, Denver, CO 80203 303/860-9021 Fax 303/860-9537 November 13, 2015 JRH Project#2737.02 Town of Vail 1309 Elkhorn Drive Vail, Colorado 81657 Attn. Randy Guzik RE: Status of VTC Double Tee and Column Repairs Vail Transportation Center Vail, CO References: 1. Drawings S 1 - S4, Double Tee and Column Repairs, 10/8/2014. 2. Construction Observation Reports, prepared by J.R. Harris & Company for Town of Vail, attached. Dear Mr. Guzik, Based on my site observations, and with the exception of the underdrain system and galvanizing of structural steel, I attest that the work described by the referenced drawings appears to have been substantially completed and is in general conformance with the intent of the design drawing. The underdrain system was not installed; it had been deleted by the Town of Vail. Likewise, galvanizing of structural steel members was deleted by the Town of Vail, so the structural steel was not galvanized. Please call if there are any questions. Very truly yours, J. R. HARRIS & COMPANY � �� - Frederick R. Rutz, PE, PhD Attachment: Construction Observation Reports, 4/21/2015, 4/30/2015, 5/4/2015, and 10/6/2015. James Robert Harris,P.E.,S.E.,Ph.D.,NAE Gene R.Stevens,P.E.,S.E. G.Brent Norris,P.E. Frederick R.Rutz, P.E.,Ph.D. Kenneth W.Cobb,P.E.,S.E. Donald C.Carroll,P.E. J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS VTC -Double Tee & Column Repairs April 21, 2015 Construction Observation Report Page 1 of 2 CONSTRUCTION OBSERVATION REPORT -- � Date: Apri121, 2015 � � Project: VTC Double Tee & Column Repairs � ' � Job No: 2737.02 Client: Town of Vail � � ;�� Conditions: Ptly Cldy, SOF �- �kn,�� Report by: Fred Rutz � �' �,� Present: Fred Rutz, J.R. Harris & Company , � �' Randy Guzik, Town of Vail � Gonzalo, Lazano Welding Distribution: John King, Town of Vail Randy Guzik, Town of Vail STATUS: Fabrication of steel supports far double tee repairs has been completed for tee stems 103 - 108. Welding of vertical plates to the existing steel hanger plates was in work. Shop drawings for the steel fabrications had not been submitted. The CMU wall at the west end of the room above the boiler room had been removed for access. OBSERVATIONS: 1. I spot-checked some dimensions on the fabricated assemblies. They appeared OK. The assemblies are structural steel painted with gray primer; they had not been hot-dipped galvanized. The bearing pads had not yet arrived on site. 2. The welding crew had cleaned the surfaces of the existing steel plates to receive welds to bare metal. I requested the entire eXisting steel hangers be sand blasted to clean up all the accumulated dirt and corrosion. ACTION: Contractor to sandblast the existing steel hangers. 3. We reviewed the lifting operation. The lifts are tentatively scheduled for Tuesday, April 28. I requested at least 48 hour notice of the lift date. ACTION: Contractor to confirm lift date with Randy as work progresses this week. Randy to advise Fred of actual lift date. 4. I requested the welds be inspected prior to the installation of the new steel assemblies as per the Quality Assurance notes on the drawings. ACTION: Field welds to receive special inspection. J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS VTC —Double Tee & Column Repairs April 21, 2015 Construction Observation Report Page 2 of 2 5. I advised Randy that I would be out-of-office Thursday and Friday of this week. If any questions come up, he can contact Don Carroll or Jared DeBock at J.R. Harris & Company, 303 860-9021. Submitted by, J.R Harris & Company ��'�� Frederick R. Rutz, P.E. Principal J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS VTC -Double Tee & Column Repairs April 30, 2015 Construction Observation Report Page 1 of 2 CONSTRUCTION OBSERVATION REPORT -- � Date: Apri128, 2015 � � Project: VTC Double Tee & Column Repairs � ' � Job No: 2737.02 Client: Town of Vail � � ;�� Conditions: Ptly Cldy, SOF �- �kn,�� Report by: Fred Rutz � �' �,� Present: Fred Rutz, J.R. Harris & Company , � �' Randy Guzik, Town of Vail � John King, Town of Vail Eduardo Lozano, Lozano's Welding& Fabrication Jeff Romero, Blazer Waterproofing Systems Distribution: John King, Town of Vail Randy Guzik, Town of Vail Eduardo Lozano, Lozano's Welding & Fabrication Jeff Romero, Blazer Waterproofing Systems STATUS: The steel supports for seven tee stem hanger assemblies were in place. The grout for the steel plates on the deck above the hangers had been installed the day before. OBSERVATIONS: 1. The steel hanger assemblies had been set in place but not lifted as of 8 AM. I spot-checked the installations and all work appeared satisfactory. Some undercutting was observed along a vertical weld at the new vertical plate to the existing hanger plate, but it was considered acceptable. 2. The grout at the bearing plates above the tee stems was still soft as of 8 AM, after being placed the afternoon before. I could remove some of it with finger pressure. I rejected the grout. The grout was removed during the morning and replaced with Dayton Superior HD 50 Horizontal Repair Mortar in the early afternoon. This material set-up rapidly and the bearing plates were reset. Lifting commenced about 3 PM. 3. Lifting was accomplished in the following sequence: #103, 104, 105, 106, 107, 108, and 179. The tee stems were lifted just enough to permit removal of the deteriorated pads and the old shim stacks. All were then lowered a small amount to approximately the same elevation where they were prior to the lifts. #103 may have been lowered slightly more to try to line-up the deck surface above it and the deck to the west on the other side of the expansion joint as best as possible. 4. The spacer plates shown on Details 4/S3 and 5/S4 were not installed prior to the lifts so they could be installed snug against the tee stems after the lifts. J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS VTC—Double Tee & Column Repairs Apri130, 2015 Construction Observation Report Page 2 of 2 ACTION: Contractor to install the spacer plates. 5. The existing sire sprinkler pipe at hanger assembly at stem#179 was sprung about 2"to make room for the hanger. While it appears OK in its current position at this time, I am concerned that future movements of the tee may result in abrasion at the pipe surface, weakening the pipe. ACTION: Town of Vail to evaluate the pipe and determine possible remedial action. 6. Randy, Ed, and I observed the corroded rods at the previous hanger repair at stem 117 on Leve13. These corroded rods are to be replaced. That hanger will need to be shored and reshored to the lowest (slab-on-grade) level below prior to rod removal. ACTION A: Contractor to install sharing here. The design shoring load should be 26 kips to level2 and 52 kips to level 1. Parking should be prohibited on the tee and the tees immediately adjacent to it during the rod removal and replacement operation. ACTION B: Because the replacement rods and nuts are now not galvanized, they should be thoroughly cleaned, primed and painted prior to installation and touch-up painted after installation, this to guard against future corrosion. The presumed source of water that caused a major part of the existing corrosion appears to have come from the failed seals around the boiler flue enclosures to the north. The seals in these regions should be repaired. 7. Randy, Jeff, and I reviewed the upcoming column repair at level 1 and the upcoming concrete topping removal and replacement at level4. I prepared sketches (attached) to illustrate the required rebar for the topping. ACTION: Contractor to install rebar per the attached sketches. J.R. Harris & Company is to be notified for a rebar inspection prior to concrete placement. Submitted by, J.R. Harris & Company / � Frederick R. Rutz, P.E. Principal J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS Project No. Z..�3'�.dZ By��. Date f � � 1775 Sherman Street,Suite 2000 Denver, CO 80203-4356 Project Name 303f860-9021 Fax:303/860-9537 Client Checked Date www.JRHarrisAndCo.com - Subject Tb�'P G h��"� � �� _ Sheet��_Of � G��Q� �' o � _ - , .-_ ��.�--...-�.—�..-�.� - . � .�� .�:�.. � r � � � � � � �� I � �� — E � � � � � �d d' � p ! � � � � � � �, � � i � - � � � � � i� � � _ �� sA.� �� r � I � � r I � e � fd � � 11 I 9 �� N `� �� ^ �� = , � � � � tl �� s � �� o ( ° Q� � G 4i � p �� i � � � �� ! 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HARRIS & COMPANY STRUCTURAL ENGINEERS VTC -Double Tee & Column Repairs May 6, 2015 Construction Observation Report Page 1 of 2 CONSTRUCTION OBSERVATION REPORT -- � Date: May 4, 2015 � � Project: VTC Double Tee & Column Repairs � ' � Job No: 2737.02 Client: Town of Vail � � ;�� Conditions: Cloudy, some rain, SOF �- �kn,�� Report by: Fred Rutz � �' �,� Present: Fred Rutz, J.R. Harris & Company , � �' Charlie McCune, Blazer Waterproofing Systems � Jeff Romero, Blazer Waterproofing Systems Distribution: John King, Town of Vail Randy Guzik, Town of Vail Charlie McCune, Blazer Waterproofing Systems STATUS: Topping had been chipped off the top of the double tee flanges. The slab-on-grade panel adj acent to the area of removed topping had been removed. OBSERVATIONS: 1. Several holes through the tee flange had been left behind after the topping removal operation. The largest hole was about 12"x 12"; the others were much smaller. Blazer was installing board forms flush with the bottom of the tee flanges. 2. Concrete obstructions had been discovered on the north face of the wall. Two of them appear to be fins, shown on the 1973 drawings as terminating about five feet down from the top of wa1L The third and largest appears to be the remnant of a former ventilation shaft that had been cut off and capped when the 1990 addition with the drive ramp was installed. All interfere with the drain system as designed. 3. I was informed that Town of Vail had changed the drain design by eliminating the pipe to the storm drain, eliminating the trench north of the wall, and installing gravel wrapped in filter fabric laterals extending from the face of wall to the north about siX feet,with a lateral located between the three concrete obstructions on the north face of the walL The laterals had been buried by 10:00 AM when I arrived. I discussed my concern with John King by telephone that this arrangement could introduce water into the subgrade below the slab-on-grade and result in softening of that subgrade in the future. I was advised that the Town had changed the design and that part of the basis for that decision was that future slab removal and replacement if necessary was more cost effective than building the buried drain pipe system. I requested Blazer compact the subgrade. Charlie said he had a hand-held compactor to do that. 4. The PVC membranes were installed over the U-rebars and sealed around the U-rebars J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS VTC —Double Tee & Column Repairs May 6, 2015 Construction Observation Report Page 2 of 2 with tape intended to splice seams in the PVC membrane. That work appeared satisfactory. Strips of drain board, about 8"wide,were set in place between the U-rebars, oriented N-S and extending about 2 feet to the north. I requested they be folded snug against the north face of the wall and in contact with the subgrade to avoid voids below the slab-on-grade. 5. I observed the rebar's at the topping slab. The#5 bars had been installed too high; Blazer lowered the #5 bars while I was there. 6. Blazer installed a grid of#4 rebar at 12"o.c. each way approximately in the mid-height of the 6" slab-on-grade portion. Submitted by, J.R. Harris & Company � I • ,��, - Frederick R. Rutz, P.E. Principal J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS VTC —Double Tee & Column Repairs Oct. 6, 2015 Construction Observation Report Page 1 of 2 �—, CONSTRUCTION OBSERVATION REPORT � c. � j, Date: Oct. 6, 2015 Project: VTC Double Tee & Column Repairs Job No: 2737.02 � � Client: Town of Vail � �Z �� Conditions: Clear, 60F ° �� Report by: Fred Rutz � �� Present: Fred Rutz, J.R. Harris & Company Randy Guzik, Town of Vail Distribution: John King, Town of Vail Randy Guzik, Town of Vail STATUS: Topping had been chipped off the top of the double tee flanges. The slab-on-grade panel adj acent to the area of removed topping had been removed. OBSERVATIONS: 1. The underside of the westernmost tee flange exhibited broken surfaces near the expansion joint and the north walL View from above, the topping slab at this same area appeared sound. Comment: It appears that removal of the topping in May 2015 had cracked the tee flange in this area but the cracks were not observed at that time. After four months of traffic, sufficient flexing and vibration had occurred to result in the broken flange. Action: Remove old wood that was attached adjacent to the expansion joint in former years. Patch the underside of the flange. Submit a proposed material and procedure far the patch. 2. The concrete fill over the north wall has several transverse cracks; the most severe cracks were near the west and east ends of the concrete fill. Comment: The damaged concrete will need to be removed and replaced. Randy expressed the preference to defer those repairs until spring. Action: For now,rout and install sealant at all the cracks—to keep water out, this to minimize further damage until spring. JRH to prepare a design detail for repair in spring 2016. J.R. HARRIS & COMPANY STRUCTURAL ENGINEERS VTC —Double Tee & Column Repairs Oct. 6, 2015 Construction Observation Report Page 2 of 2 Submitted by, J.R. Harris & Company � I i ��• - Frederick R. Rutz, P.E. Principal