REQUEST FOR INFORMATION (RFI)

Transcription

1 Planning, Development & Facilities 349 Magnolia Avenue Glendale, California Tel: Fax: Project Name: Jefferson ES-12 Classroom Bldg. DSA No: A#: , File#:19-41 District PO No: District Contract No: /16 REQUEST FOR INFORMATION (RFI) To: Armond Mailan From:Chalmers Construction Services Inc. Required by: Ara Baghdasarians RFI No. 076 Date: 12/12/16 Answered: REFERENCE: Drawing(s) - Specification(s) Page(s) CONTRACTOR S REQUEST: As the installed anchor bolts on grid line 2 ( Between gridlines B-E ) are +/- 1" lower than proposed elevation so It will not be enough threads out for anchor bolts after installing the washers and nuts. Same situation for few other base plate's anchors on different locations which It will not be enough threads out after installing the washer and nut. ( Please Advice ) Based on this also the 2" indicated non-shrink grout underneath the base plate will be 3". ( PLease confirm ) **See attached pictures** PROPOSED SOLUTIS: As the material of steel is same for both achor bolts and base plates so it is suggested to eliminates the nut and just use the 1" washer plate including the weld all around the washer and on top of it. DISTRICT REPRESENTATIVE S ADDITIONAL INFORMATION: ARCHITECT S RESPONSE: *This response was provided FOR INFORMATION ONLY with no effect to the contract. *This response is a CLARIFICATION of the contract. (NO COST or TIME EFFECT) *This response is a MINOR CHANGE to the contract with no effect to the contract cost or time. (NO COST or TIME EFFECT) **This response CHANGES the contract with an anticipated effect to contract cost and/or time. (COST/TIME EFFECT) The Contractor is to prepare a Change Order Proposal before proceeding. * This does not modify contract cost or time. If the recipient believes that the RFI has any effect on contract cost and/or time, the recipient shall respond in writing in accordance with Contract provisions.

2 RFI#076 response from NAC 01/09/2017 January 09, 2017 Issued as response attachment to RFI #76 Re: GUSD Jefferson ES ORG response to RFI #76 DSA A# Architect s Response to RFI #076 DSA has approved the submitted CCD#0 which is now attached to the response to RFI#076. The CCD#0 addresses the grout and anchor bolt issues, but additional documentation for clarity has been provided as noted below. Testing shall be coordinated with the project Testing Lab and in keeping with Section #4 of DSA IR 17-8 (issued by DSA on ). Below is from of 12/23/2016, from Brad Brewer, NAC RFI#76: Low anchor bolts and grouting and shear lug o Chalmers confirmed that they will utilize we will use Sika 328 for locations that the grout thickness is more than 2 o Chalmers confirmed the coupler nut solution is preferred, and steel fabricator provided recommendation of coupler model number. Please confirm coupler meets ATSM parameters set in the DSA Approved CCD#0 (cut sheet documents for coupler provided by Chalmers are included in RFI#076 reference materials of response) o Chalmers confirmed that the Steel Fabricator has enough tolerance, in keeping with the Contract Documents, to account for anchor bolts that are 1/8 short. ( from Chalmers is provide by Chalmers are included in RFI#076 reference materials of response) NAC Response to RFI#076, as coordinated with KPFF Structural and discussed with GUSD, BPI and Chalmers. \\nac\0\it\nac-forms\2016-form-updates\don potts\new forms\word\general\letterhead.docx >837 North Spring Street, Third Floor, Los Angeles, CA / nacarchitecture.com Seattle / Spokane / Los Angeles

3 RFI#076 response from NAC 01/09/ APPROVED DIV. OF THE STATE ARCHITECT LOS DIV. ANGELES OF THE REGIONAL STATE ARCHITECT OFFICE LOS ANGELES REGIONAL OFFICE DATE SS 01/05/2017 FLS AC DATE lzeitoun

4 RFI#076 response from NAC 01/09/ APPROVED DIV. OF THE STATE ARCHITECT LOS DIV. ANGELES OF THE REGIONAL STATE ARCHITECT OFFICE LOS ANGELES REGIONAL OFFICE DATE SS 01/05/2017 FLS AC DATE lzeitoun CCD-A0 CCD-0A 8 8 <AS REVISED>

5 RFI#076 response from NAC 01/09/2017 APPROVED DIV. OF THE STATE ARCHITECT LOS DIV. ANGELES OF THE REGIONAL STATE ARCHITECT OFFICE LOS ANGELES REGIONAL OFFICE DATE SS 01/05/2017 FLS AC DATE lzeitoun CCD-A0 CCD-0A 8 <AS REVISED>

6 RFI#076 response from NAC 01/09/ APPROVED DIV. OF THE STATE ARCHITECT LOS DIV. ANGELES OF THE REGIONAL STATE ARCHITECT OFFICE LOS ANGELES REGIONAL OFFICE DATE SS 01/05/2017 FLS AC DATE lzeitoun <AS REVISED> CCD-0A CCD-A0

7 RFI#076 response from NAC 01/09/ /2" MIN 6" MIN TO 8" MAX EMBED 2" MIN TO 4" MAX 009 ROD COUPLER WHERE TOP OF THREADED ROD HAS LESS THAN 0" OF PROJECTION THROUGH NUT AT TOP OF BASE PLATE 008 NTS APPROVED DIV. OF THE STATE ARCHITECT LOS DIV. ANGELES OF THE REGIONAL STATE ARCHITECT OFFICE LOS ANGELES REGIONAL OFFICE DATE SS 01/05/2017 FLS AC DATE lzeitoun DSA FILE NUMBER: DSA APPLICATION NUMBER: PROJECT NAME: Jefferson ES ORG NEW DETAIL DATE: CCD-A0 008 REFERENCE DRAWING 1/S6

8 RFI#076 response from NAC 01/09/2017 ASTM A354 GRADE BD THREADED ROD TO MATCH DIA OF SHORT ROD BELOW BRACED FRAME BASE PLATE EQ NON SHRINK HI STRENGTH GROUT T.O. FOUNDATION PER PLAN ASTM A563 DH COUPLING NUT APPROVED DIV. OF THE STATE ARCHITECT LOS DIV. ANGELES OF THE REGIONAL STATE ARCHITECT OFFICE LOS ANGELES REGIONAL OFFICE DATE SS 01/05/2017 FLS AC DATE lzeitoun 2" MIN, 3" MAX EQ 1" MAX TYP SHORT ASTM A354 GRADE BD ANCHOR ROD PER 1/S618 CHIP OUT AND SOLID GROUT NOTES: 1. SEE 1/S618 FOR BALANCE OF INFORMATION NOT SHOWN. BRACED FRAME BASE ANCHOR ROD EXTENSION DSA FILE NUMBER: DSA APPLICATION NUMBER: PROJECT NAME: Jefferson ES ORG NEW DETAIL DATE: CCD-A0 009 REFERENCE DRAWING 2/S618

9 RFI#076 response from NAC 01/09/2017 ASTM A36 ALL THREAD ROD TO MATCH DIA OF HEX HEAD ANCHOR BOLT BELOW COLUMN BASE PLATE EQ NON SHRINK HI STRENGTH GROUT T.O. FOUNDATION PER PLAN ASTM A563 A COUPLING NUT APPROVED DIV. OF THE STATE ARCHITECT LOS DIV. ANGELES OF THE REGIONAL STATE ARCHITECT OFFICE LOS ANGELES REGIONAL OFFICE DATE SS 01/05/2017 FLS AC DATE lzeitoun 2" MIN, 3" MAX EQ 1" MAX TYP SHORT ASTM A307 HEX HEAD ANCHOR BOLT PER 5/S600 CHIP OUT AND SOLID GROUT NOTES: 1. SEE 5/S600 FOR BALANCE OF INFORMATION NOT SHOWN. GRAVITY COLUMN BASE ANCHOR ROD EXTENSION DSA FILE NUMBER: DSA APPLICATION NUMBER: PROJECT NAME: Jefferson ES ORG NEW DETAIL DATE: CCD-A0 0 REFERENCE DRAWING 5/S600

10 RFI#076 Initial Reference Materials/photos: Provided by Chalmers with initial RFI #076 Coversheet

11 RFI#076 Reference Materials: Provided by Chalmers via 12/14/2016 From: To: Cc: Subject: Date: Attachments: Ara Baghdasarian Bradford Brewer Anchor bolts Wednesday, December 14, :36:46 PM IMG_ png Hello Brad, Please disregard anchors that are low 1/8. After we sent you previous , I talked to steel sub and he told me that he has enough tolerance to adjust the 1/8. So top of nut will be flush with anchor. Three steel plates on Grid line 2 are the ones that needed to be fix. Thank you, Sincerely, Ara Baghdasarian Chalmers Construction Services Inc 2600 Foothill Blvd. Suite 304 La Crescenta CA Office Fax Cell

12 Nut Compatibility Chart - Portland Bolt RFI#076 Reference Materials: Provided by Chalmers via 12/14/ /20/16, 2(38 PM (800) sales@portlandbolt.com Nut Compatibility Chart A563 Grade and ANSI Nut Style Grade of Bolt Surface Finish Nominal Size Inches Recommended Suitable A307 Grade A & C A307 Grade B Any Any Hex Heavy Hex Hex Heavy Hex to 1 A B,D,DH A,B,C,D,DH,DH3 >1 to 2 A A C,D,DH,DH3 >2 to 4 A C,D,DH,DH3 to 1 A B,D,DH A,B,C,D,DH,DH3 >1 to 2 A A >2 to 4 A A325 Type 1 Plain - 1 C C3,D,DH,DH3 Galvanized - 1 DH A325 Type 3 Plain - 1 C3 DH3 A354 Grade BC A354 Grade BD A449 Plain Galvanized Plain Plain Galvanized to 1 C D,DH C3,D,DH,DH3 >1 to 4 C C3,D,DH,DH3 to 1 DH >1 to 4 DH to 1 DH DH D,DH,DH3 >1 to 4 DH DH3 to 1 B D,DH B,C,C3,D,DH,DH3 >1 to 3 A C,C3,D,DH,DH3 to 1 DH D,DH D >1 to 3 DH D A490 Type 1 Plain - 1 DH DH3 A490 Type 3 Plain - 1 DH3 A687 Plain - 3 D DH,DH3 Galvanized - 3 DH to 1 A B,D,DH A,B,C,D,DH,DH3 Page 1 of 2

13 Nut Compatibility Chart - Portland Bolt RFI#076 Reference Materials: Provided by Chalmers via 12/14/ /20/16, 2(38 PM F1554 Grade 36 Any >1 to 4 A C,D,DH,DH3 F1554 Grade 55 Plain to 1 A B,D,DH A,B,C,D,DH,DH3 >1 to 4 A C,D,DH,DH3 Galvanized to 4 A C,D,DH,DH3 F1554 Grade 5 Plain to 1 D DH,DH3 >1 to 3 DH DH3 Galvanized to 3 DH DH3 1. The availability of A563 grade DH nuts in nominal sizes 3/4 and larger is very limited and generally available only on special orders of 50,000 or more. For smaller quantities, ASTM A194 grade 2H should be considered. ASTM A194 Nut Compatibility Chart Grade of Bolt A194 Heavy Hex Nut Grade A193 Grade B7 2H or 4 or 7 A193 Grade B8 (Class 1 and 2) 8 A193 Grade B8M (Class 1 and 2) 8M A320 Grade L7 4 or 7 A320 Grade B8 (Class 1 and 2) 8 A320 Grade B8M (Class 1 and 2) 8M For Class 2 stainless steel grades, strain hardened nuts available as a supplementary requirement Page 2 of 2

14 Hex Coupling Nuts - Portland Bolt RFI#076 Reference Materials: Provided by Chalmers via 12/14/ /20/16, 2(38 PM (800) sales@portlandbolt.com Hex Coupling Nuts A194 A563 F594 Hex couplers are used to connect two pieces of threaded material. Hex and heavy hex couplers are threaded right hand. If a right hand-left hand coupler is needed, consider using a sleeve nut. Related Products Sleeve Nuts Turnbuckles Washers See our nut compatibility chart to determine the compatible hex coupler for a specific grade of bolt. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized couplers are tapped oversize to compensate for the corrosion resistant coating on the bolts. Stock Diameters: 1/2 1 Origin: Domestic and import Finish: Plain and hot-dip galvanized Grades: A563 (grades A and DH) Related Links Coupling Nut Thread Engagement Galvanized Nuts Tapped Oversize Coupling Nut Grades Available Diameters: 1/2 6 Origin: Domestic and import Finish: Plain and hot-dip galvanized Grades: A563 (grades A, C, and DH), A194 grade 2H Dimensions Finished Hex Coupler Pattern F C H Part Numbers Size Width Width Across Across Flats Corners Bas Max Min Max Min ic Ba sic Nominal Length/Thickness Import Max Min Plain Galvanized Page 1 of 3

15 Hex Coupling Nuts - Portland Bolt RFI#076 Reference Materials: Provided by Chalmers via 12/14/ /20/16, 2(38 PM Dimensions per ASME B Some dimensions may vary by supplier Heavy Hex Coupler Pattern F C H Part Numbers Nomi nal Size Width Across Basi c Flats Width Across Corners Max Min Max Min Basi c Thickness A563DH Domestic Max Min Plain Galvanized Page 2 of 3

16 Hex Coupling Nuts - Portland Bolt RFI#076 Reference Materials: Provided by Chalmers via 12/14/ /20/16, 2(38 PM Heavy coupler dimensions are not defined by ASME The width across the flats and corners match the dimensions of a heavy hex nut. Page 3 of 3

17 RFI#076 Reference Materials: Anchor Bolt Dimension Shy of Being Flush Provided by Chalmers via 12/14/2016

18 RFI#076 Reference Materials: Grout Thicknesses Exhibit, Provided by Chalmers via 12/15/2016 RFI#076 Reference Materials: Grout Thicknesses Exhibit, Provided by Chalmers via 12/15/2016