TG Structural Steel Superstructure

Transcription

1 TG Structural Steel Superstructure Questions are numbered in the order received. Numbers missing in the sequence either have been answered in a previous response set or will be included in a future response set. Question No. Date Submitted Drwg. No. Spec. No. Other Ref. Question Response We have asked numerous questions to clarify some major issues which we and the anticipated fabricators have encountered in the bidding phase of this project, specifically 31 questions. To date, we have not received any clarifications to our questions. As such, unless the clarifications to our questions will be received in the next day or so, we, that is both ourselves and the fabricators who are anticipating to bid this project, will not be in a position to submit a bid estimate on February 7th. As we have noted in our questions, we are specifically concerned about some components that will not be able to fall under the Buy America provisions, and the scope of work which we feel is in question. As we had requested, we would like an opportunity to discuss some of the bid issues in a second pre-bid meeting in order to help you establish a good understanding of these issues and therefore minimize the cost for this project. We therefore request that the bid opening be further extended by at least two to three weeks. An additional pre-bid meeting will not be scheduled We request that Webcor Obayashi schedule a second pre-bid meeting with all of the qualified bidders and fabricators to address some of the major technical and commercial issues of this project. We feel that a meeting would be much more fruitful than just submitting written questions since some of the issues require extensive dialogue. We understand than we will probably not be able to take away responses from this meeting, but the goal is to make Webcor-Obayashi understand the bidders concerns. An additional pre-bid meeting will not be scheduled Exhibit A - Page 18, Section 3H Please define the limits of the platform to be installed by the TG07.1 subcontractor which will be used by the follow-on trades. Unless a drawing showing the limits of the platform and the required loading criteria is given, we cannot provide an appropriate price for this item. We suggest that this portion of the scope be deleted and incorporated as a change order at a later date when input from all parties involved can be incorporated into the design and construction of the platform. The Temporary Vehicle and Pedestrian Protection was removed from the TG07.1 scope in Addendum #7. Standard protection requirements for TG07.1 remain as defined in the contract documents S Please reference Plan S between grid lines 14 & No, this detail does not apply at the February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 1 of 8

2 , 3/S /S /S S & S Deck Level Zone 04 which shows an incline of 1-1 between grid lines B & D and grid lines F & H and Detail 3/S Does the left hand detail illustration shown in detail 3/S (continuous shim plate or bent plate) apply at each W24x55, W27x84, W30x90, etc. outboard to grid lines B & H, does this same illustration apply to diagonal W40x277 beams? Does the right hand detail illustration shown in detail 3/S apply only at grid lines D & F? Does the right hand detail illustration shown in detail 3/S apply only at grid lines D & F? S & S Gridlines C&G Please provide connection to wide flange beam and finish of HSS4x4x1/4. Also connection and finish of L4x4x1/4 to HSS4x4x1/4. bus deck sloped slab. For areas of ¼" per foot slope (includes sloped bus deck and sloped roof areas), beams are to be set so that the web of the beam is perpendicular to the floor slab. No. Detail 3/S does not apply. Where the slab transitions from slope to flat, the detail is similar to typical detail 5/S where one side is sloped. The deck shall break at the transition. The right hand detail of 3/S will be removed from the documents. This change will be made after award of the contract. See response See section 1/S that is referenced from the plan. The HSS 4x4 shall be welded to the top of spandrel wide flange beam as well as the top of the interior wide flange beam (3/16" flare bevel, each side, 3" typ). The HSS shall be welded to the L4x4 edge angle (1/4" fillet, each vertical side of HSS, 3") Exhibit A, Item 3.H "Temporary Vehicle and Pedestrian Protection" - Bid Item #78 (rev 1) Pursuant to Bid item #78 Temporary Safety Platform Over Public Traffic : We request that you provide the following necessary details and/or clarifications, which will enable us to provide an accurate cost estimate for bid item #78: - Identify the maximum Load requirements for both the Street Protection Structural Enclosures and the material deflection screen, per page 18, item 3.h, lines 5 ]7. - Provide specific limits for the accurate installation of The HSS4x4x1/4 should be prepared to receive fireproofing type IFRM-1 (intumescent coating) and since the L4x4x1/4 is welded to it, it should also be prepared to receive IFRM-1. Refer to response February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 2 of 8

3 each temporary platform per page 19, item 3.h, line 1 adequate distance North beyond Col A and South beyond Col J. Additionally, please define specific limits for the material deflection screen. - Identify / define all requirements so the temporary structure can be certified per page 19, paragraph 2, line 4. - Per page 19, paragraph1, lines 2 ]3 A Minimum of two points of Access and Egress must be provided to each end of platform, please identify the intended user(s) for access and egress (ie: craft / labor, construction / delivery vehicles, equipment, etc ), so that adequate access and egress can be estimated for design, fabrication and installation If further specific information is not provided, we will be unable to submit an accurate price for this required bid item. Please provide this information in a timely manner so we can adequately prepare, design and estimate the required elements of this bid item The project bid date has been moved from January 10th No updated concept schedule will be 2013 to March 7th The current concept Schedule provided, but the logic remains the is based on the project being bid on January 10th same. Please provide a revised concept schedule that accommodates the extension of the project bid date What are the minimum vertical and horizontal Refer to response dimensions the Street Protection Enclosure (SPE) needs to provide at each location? What are the materials and depths for the typical Refer to response section of the structure to be protected at each location? Does/can the existing, protected structure need to be Refer to response re-shored from below if the SPE footings are placed on the deck? Q and A state that Bid Item # 62 is no longer in the TG07.1 scope of work. The Schedule of bid prices (addendum 6) indicates that item # 62 is now to be included in item #35. Please clarify. The Bus Ramp Connection elements per sheet S are still part of the contract scope. Costs for the Bus Ramp Connection elements shall be included with bid line item #35, WIDE FLANGE BEAMS & GIRDERS ASTM A709, as shown in Exhibit A. The 0119 response, Bid February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 3 of 8

4 , E Please remove the requirement for the Sophisticated Paint Endorsement as this is not common And not something that I believe any of the local fabricators has , , 7, a , D , G , L Please confirm that for all joints not prequalified by section 2 of AWS D1.1 Is actually section 3 of AWS D1.1. Please confirm that for all essential variable changes set for in Clause 7.7 of ANSI/AWS D1.8 Is actually Clause 4.8 of ANSI/AWS D1.8. Please confirm that the reference to AISC 341, Appendix W is now AWS D per newer code. Please confirm that the reference to pre-heat before thermal cutting only applies to cutting of W.A.H. Please confirm that The preheat shall be maintained throughout the thickness of the material for a distance equal to twice the material thickness is actually the thickness of the thickest part or three inches, Whichever is greater, per current code. Item #62 is no longer part of TG07.1 and will be removed in Addendum #6, referred to the removal of Bid Item #62, not the scope of that work. The scope of the work should be included in Bid Item #35 instead. Refer to response Confirmed. Section , paragraph 1.4.A.7, will be revised to reference section 3 instead of section 2. This change will be made after award of the contract. Confirmed that reference to clause 7.7 of AWS D in Section paragraph 1.4.A.7.a shall be revised to reference clause 4.8. This change will be made after award of the contract. Confirmed. Reference to AISC 341, Appendix W, in Section paragraph 1.6.D shall be revised to reference AWS D instead. This change will be made after award of the contract. Confirmed. Paragraph 3.2.G of Section applies to cutting of heavy shapes only, as stated in the title of this paragraph. The paragraph "The preheat shall be maintained throughout the thickness for a distance equal to twice the material thickness..." in Section paragraph 3.2.L.4.b shall be deleted and replaced with, "The preheat shall be performed in accordance with AWS D , Section 5.6." This change will be made after award of the contract , Please confirm that the reference to Annex E is actually Confirmed. Reference to Annex E 0163 A, 1, a Annex F. shall be revised to reference Annex F. This change will be made after award of the contract , Please confirm that reference to CVN values of not less The CVN toughness requirement February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 4 of 8

5 0164 C.2 than 80 feet-pounds at 40 degrees is supposed to be 40 specified in Section feet pounds at 40 degrees. paragraph 2.1.C.2 remains. This requirement is based on AISC Seismic Provision Chapter K, paragraph 3f, which requires that the CVN toughness shall not be 25 ft-lbs or 33% lower than the CVN toughness for the test specimen , C, , C, 2, b, , C, 2, b, , C, 2, c, , C 2, f, Bus Deck Level Please consider revising. The LAST value of 20 degrees F, is lower than the lowest recorded temp. There is not a PQR or a WPS that will meet this requirement for both the field and shop. Please confirm that the reference to AWS D1.8 Section 6.10 is actually AWS D1.8 section 6.11 Please remove the reference to repairing gouges deeper than 1/16 by welding, and revise it to read by grinding as shown in AWS D Please confirm that the reference made to section should actually be AWS section Please confirm that the reference made to section and section should actually be AWS Section and What is the grade of material for the PIPE16x1.031 on Gridline 21 & 22 of the Bus Deck Level, A53-Grade B or API 5L-2007 Grade X52? Specification paragraph 2.1.C.3 shall be revised to read, "Lowest Anticipated Service Temperature (LAST) = 25 degrees F." This change will be made after award of the contract. Confirmed, reference in Section paragraph 2.2.C.2.b.1 shall be revised to reference Section 6.11 instead of This change will be made after award of the contract. No, Section paragraph 2.2.C.2.b.2 remains. The repair method of grinding (per AWS D1.8 Section ) is applicable only to gouges less than 1/16." Confirmed. Reference to AWS D1.8 Section shall be changed to AWS D1.8 Section This change will be made after award of the contract. Confirmed. The reference made to AWS D1.8 Section and shall be changed to and , respectively. This change will be made after award of the contract. See sheet S issued in Addendum #3 for pipe grade S GL 19.9-E there s a callout for 2/S The callout should reference This is a phase 2 drawing we don t have, please advise. detail 9/S This change will be made after award of the contract S GL 21-F; there s a callout for 2/S Missing drawing S GL E.6-24; there s a callout for 4/S Missing drawing Sheet S was issued in Addendum #3. Sheet S was issued in Addendum #3 and modified in Addendum # S & 8 also for the Skewed Beam The height of shear plates shall be February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 5 of 8

6 connections, no height of the shear plate to beam web is referenced. The height of the plates shall be determined by the number of bolts required for the beam. Please verify Sheet S is missing and 1/S is referenced on sheet S and appears to have structural HSS or stair HSS columns that are un-sized please provide sizes and all connection details Sheet S is missing and 1/S is referenced on sheet S and appears to have structural HSS or stair HSS columns that are un-sized please provide sizes and all connection details. determined by number of bolts, bolt spacing, and edge distance, which are provided in 1/S & 1/S Sheet S was issued in Addendum #3 and includes element sizes and connection detail references. Sheet S was issued in Addendum #3 and includes element sizes and connection detail references Sheet S is missing and 3/S is referenced on sheet S and appears to have structural HSS or stair HSS columns that are un-sized please provide sizes and all connection details. See response Sheet S is missing and 5/S is referenced See response on sheet S and appears to have structural HSS or stair HSS columns that are un-sized please provide sizes and all connection details Sheet S is missing and details 1-4/S are Sheet S was issued in referenced on sheets S1-2204, S1-2304, S & S1- Addendum # and pertains to Elevator Steel please provide missing sheets Sheet S is missing and details 1-4/S are Sheet S was issued in referenced on sheets S1-2205, S1-2305, S & S1- Addendum #3 and modified in 2505 and pertains to Elevator Steel please provide Addendum #4. missing sheets Sheet S is missing and 2/S is referenced Sheet S was issued in on S that appears to have structural HSS or stair Addendum #3 and modified in HSS columns that are un-sized please provide sizes Addendum #4 and includes element and all connection details. sizes and connection detail references Sheet S is missing and 1/S7305 is referenced on sheet S and appears to have structural HSS that are un-sized please provide sizes and all connection details A2867 Between lines 32.4 and 33.2 there are PL1 designations for W-3 connections which are shown in Details 5/S8004. At the same location there are PL3 designations but we cannot find any details showing a PL3 connection. Please provide details for PL3 connections S near grid 16/F calls out HSS6x6x5/8 (typ. 42 places) yet no detail is referenced for connection please provide. Sheet S was issued in Addendum #3 and includes element sizes and connection detail references. For bidding purposes, Bidder may assume PL3 connections are similar to PL1. Refer to Addendum #6. Bus level plan S calls out detail 10/S for bottom of HSS detail, and February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 6 of 8

7 S and S S near grid 24.5/D.4 calls out HSS6x6x5/8 (typ. 8 places) yet no detail is referenced for connection please provide S near grid 25/E.6 calls out HSS6x6x5/8 (typ. 10 places) yet no detail is referenced for connection please provide S grids 14 to approx between D & F appears to be HSS members with no sizes (42 places) and no detail is referenced for connection please provide S at both sides of grids 24.9 & 25 between D & F appears to be HSS members with no sizes (16 places) and no detail is referenced for connection please provide Ref. B/S HSS members between Bus Deck Level & Roof Park Level at grids E.6 & D.4 are un-sized. Please provide HSS member sizes & provide connection to supporting steel at top & bottom of HSS Ref. C/S between Lower Level Concourse to under Roof Park Levels between E.6 & D.4 there are unspecified & un-sized members at all levels. Please provide all un-sized member sizes & provide all necessary connection details to connect to supporting steel. roof level plan S calls out details 4 & 7 on S for top of HSS details. Refer to Addendum #6. Bus level plan S calls out detail 10/S for bottom of HSS detail, and roof level plan S calls out detail 7/ S for top of HSS detail. Refer to Addendum #6. Bus level plan S calls out detail 10/S for bottom of HSS detail, and roof level plan S calls out details 4 & 7 on S for top of HSS details. These are HSS posts under the roof level slab. The size is called out on Bus Deck plan S Refer to response 0188 for connection information. These are HSS posts under the roof level slab. The size is called out on Bus Deck plan S & S Refer to response 0189 for connection information. HSS members are called out on plan S as HSS6x6x5/8. See response 0188 for connection information. Detail C/S shows the stair framing for stair 401 beyond. C/S backreferences to S1-7009, which includes element sizes and connection detail references Reference S and S1-5031, Connection plate for The shear plate details on S Crash Rail Support beam shown is a ½ Plate, Full and S are special details that Height Shear Tab with a 5/16 Fillet 3 sides. Please note supersede the typical details on the that although the wide flange beams are connecting to typical detail sheet S a diagonal beam (this creates a Skewed Beam connection) the details called out on these two sheets will supersede the typical Skewed Beam Connection of detail 8/S We have the ½ Full Height Shear Tabs included for the connections as shown, not the plate assembly as shown for Skewed Connections per 8/S February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 7 of 8

8 , Please clarify why these code sections are being B, 1, a & b & e deleted. We feel that these sections are important and & f need to be included as part of the requirements. Section , paragraph 1.2, B, 1 subparagraphs a & b & e & f do not exist. We assume the Bidder is asking about Section , paragraph 1.2.B.2. Section , paragraph 1.2.B.2, subparagraphs a through f are to be deleted and replaced with the following paragraphs: a. No provision of AISC 303 shall be effective to change the duties and responsibilities of the Owner, Contractor or Design Professionals from those set forth in these Contract Documents. b. Where discrepancies exist between the requirements of the Contract Documents and AISC 303, the requirements of the Contract Documents shall govern , B, 1, c If this section is being deleted, please provide us with the requirements of the project specification. it has not been provided. These changes will be made after award of the contract. We believe that the detail referenced in this question, 1.2.B.1.c, is a typo. It should be 1.2.B.2.c. If it is correct, please see response Penthouse framing with "not in package" note on sheets S and S is not in TG07.1 at this time, and the price should not be included in the bid. Bidder is referred to detail note 5 on details 5 & 6/S1-8004, which references A From this plan, the baseplates are identified and can be quantified & S S details 5 & 6 S and S shows the pent house framing selected and the note not in package. What package does this pertain to? TG07.1? Per the details above, we are to coordinate with the TG08 subcontractor to identify locations. Without having a TG08 subcontractor to coordinate with during the bidding period this is not possible to quantify. Please provide locations in order to accurately put an estimate to areas called out "coordinate locations of base plate with pkg TG08". February 20, 2013 TG Bidder Q&A Response Set No. 8 Page 8 of 8