SCOPE OF WORK
Hastings Stadium
Exhibition Park, 81 London Road, Guelph, Ontario
Structural and Maintenance Remedial Work
Prepared For
City of Guelph
City Hall, 1 Carden Street, Guelph, ON N1H 3A1
Prepared By
March 23, 2011
Tacoma Engineers Inc.
176 Speedvale Avenue West, Guelph, Ontario
Project No. TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
Scope of Work
Page 1 of 20
Table of Contents
INTRODUCTION .............................................................................................................. 2
SCOPE OF WORK............................................................................................................. 3
TECHNICAL REQUIREMENTS ...................................................................................... 4
WORK ITEM 1:
WORK ITEM 2:
WORK ITEM 3:
WORK ITEM 4:
WORK ITEM 5:
WORK ITEM 6:
WORK ITEM 7:
WORK ITEM 8:
WORK ITEM 9:
SITE PROTECTION .................................................................................. 4
REMOVAL OF CORROSION PRODUCTS .................................................... 4
WELD REINSTALLATION ........................................................................ 5
STRUCTURAL STEEL REPAIRS ................................................................ 5
ANCHOR BOLTS ..................................................................................... 5
RECOATING OF EXPOSED STRUCTURAL STEEL AND WELDS.................... 6
NEW UPLIFT AND LATERAL BRACING .................................................... 7
NEW GUARD BETWEEN FIELD AND BLEACHERS ..................................... 7
INTERIOR STORAGE MEZZANINE UPGRADES .......................................... 8
List of Drawings
S1 – Lower Plan
S2 – Upper Plan
S3 – Tension Tie Section
S4 – Details
S5 – Tension Tie Corner Section
S6 – Column Details
S7 – Section and Details
S8 – Railing Elevation
S9 – Mezzanine Framing Plan
S10 – Mezzanine Guard Details
S11 – Structural Notes
S12 – Structural Notes
TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
Scope of Work
Page 2 of 20
Introduction
The purpose of this document, including the attached drawings, is to convey the scope of
work and technical requirements required to complete the structural and maintenance
remedial project located at the Hastings Stadium at Exhibition Park, 81 London Road,
Guelph.
In brief, the proposed work at Hastings Stadium includes the following items:
•
Clean and repair any deteriorated steel connections, including all welds, and apply
protective coatings to any exposed steel, including welds.
•
Install supports to the top edge of the exterior block walls.
•
Install adequate supports for the sidewall X-bracing, including uplift anchorage.
•
Install adequate guards at the front edge of the bleachers.
•
Remove and replace access stairs to storage mezzanine with stairs meeting the
requirements of the OBC.
•
Provide mezzanine guards meeting the requirements of the OBC.
•
Reinforce the existing wood-framed mezzanine to allow 4.80 kPa (100 psf)
storage loads.
This document is intended to be reviewed and used by the selected contractor(s) to better
understand the general scope of work required to complete the remediation project and
for pricing purposes. For pricing purposes, it is expected that the contractor(s) review
this document in conjunction with a thorough site review of the subject structure before
providing their cost to perform the work to the owner. The engineer is to be contacted
with any questions related to the scope of work during the pricing and/or construction
periods. Contact the City’s representative for any contract administration questions. The
engineer’s representative to contact is: Gerry Zegerius, E.I.T., 519-763-2000, ext. 242,
gerryz@tacomaengineers.com. The City’s representative to contact is: Samantha Jansen,
Project Manager – Facilities, 519-822-1260, ext. 2759, samantha.jansen@guelph.ca.
TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
Scope of Work
Page 3 of 20
Scope of Work
The structural remediation at Hastings Stadium is to include:
1. Installation of protective barriers around the work area to minimize the risk of
damage due to the work and to restrict unauthorized access to the work area.
2. Removal of all steel corrosion products using light construction equipment
(scraping, wire brush, blasting, etc.) to minimize the damage to the remaining
steel. Clean surfaces to SSPC SP6.
3. Reinstallation of all damaged welds.
4. Minor structural steel repairs are required. Refer to the attached drawings.
5. Drill and epoxy new anchor bolts into existing base plates and piers.
6. Preparation and recoating of all exposed steel (rust removal, prime and painting).
7. Provide new uplift and steel bracing to extend the bracing from the top of the
concrete block walls to grade.
8. Provide new guard system between the playing field and bleachers.
9. Update the interior storage mezzanine including stairs and guards.
Note that all material and workmanship standards must meet the minimums noted
on the certified drawing set. Contact Tacoma Engineers for clarification where
required.
TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
Scope of Work
Page 4 of 20
Technical Requirements
Site protection
Work Item 1:
1.1
All work is to be carried out in conformance with the requirements of OHSA.
1.2
Installation of site protection is to be appropriate to the work in progress including
physical barriers around the perimeter of the work area and all material storage
areas.
1.3
Arrange for all required inspections to identify buried and embedded utilities in
and around the work areas. Take appropriate measures to protect these items
from damage.
1.4
Throughout construction, coordinate all required reviews with Project Engineer,
City Representative (refer to cover page), and Municipal Building Department.
Reviews will include, but are not limited to: identification of deterioration,
removal of corrosion products, comprehensive welding inspection, inspection of
new coatings, placing of reinforcing steel.
Work Item 2:
2.1
Removal of corrosion products
Remove all corrosion products from structural steel members including beams,
columns, brackets, miscellaneous channels and angles, welds, and anchor bolts
and nuts.
2.2
All structural steel and remaining welds are to be sandblasted to ‘commercial
blast’ standards.
2.2.1.1
Commercial Blast SSPC-SP6 (SSI-Sa2), or NACE #3
Definition: All oil, grease, dirt, rust scale and foreign
matter are completely removed from the surface and all
rust, mill scale and old paint are completely removed by
abrasive blasting except for slight shadows, streaks or
discolorations caused by rust stain, mill scale oxides or
slight, tight resides of paint or coating that remain. If the
surface is pitted, slight residue of rust or paint may be
found in the bottom of pits; at least two-thirds of each
square inch of surface area shall be free of all visible
residues and the remainder shall be limited to the light
residues mentioned above.
TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
2.3
Scope of Work
Page 5 of 20
Contact Tacoma Engineers to review cleaned surfaces to identify any damaged
areas not visible during previous reviews. Additional reinforcing and remedial
work may be required.
Work Item 3:
Weld reinstatement
3.1
All welding to be carried out by personnel certified under the CWB.
3.2
Most of the welds connecting the bleacher decks to the structural steel are not
adequate in either length or diameter, or both. These welds shall not be considered
when applying the required weld connections.
3.3
Connect all members as follows:
3.3.1
Weld all structural steel connections all around, ¼” fillet weld, where
noted on the drawings.
3.3.2
Weld all bleacher decks to supporting structural steel brackets with 3/16”
fillet welds, 2” every 8”, and 4” at each corner, or as noted on the
drawings. Do not weld bleacher decks to supporting structure at
expansion joints.
3.4
Coordinate with welding inspector (retained and paid for by the City) to have
inspection completed and signed off by certified welding inspector.
Work Item 4:
4.1
Structural steel repairs
The column at gridline C6 has a substantial hole in the web. Repair as per detail
2/S7, attached.
4.2
Similar repairs may be required as directed by engineer following blast cleaning.
Refer to 2.3.
4.3
Include the inspection of this item in the scope of inspection for the welding
inspector noted in 3.3.
Work Item 5:
5.1
Anchor bolts
Existing anchor bolts along gridline C (field side) are corroded and have sustained
loss of section. Drill and epoxy new anchor bolts as shown on attached drawings.
TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
5.1.1
Scope of Work
Page 6 of 20
Anchor bolts to be ¾” diameter by 6” embedment stainless steel threaded
rod (Hilti HAS rods or approved equivalent).
5.1.2
5.2
Epoxy to be Hilti HY-150 or approved equivalent.
New anchor bolts are required along the top of the block wall around the rear and
sides of the building (gridlines 1, 9, and A).
5.2.1
Install ⅝” diameter stainless steel threaded rod anchors as per detail 5/S4,
attached, to properly fasten the top steel girt.
5.2.2
If the block is found to be ungrouted along the top course, cast-in anchors
are permitted in freshly placed grout.
5.2.3
Spot checks of the top course of block indicated that it was grouted solid.
The contractor should note that the top course of block must be fully
grouted prior to completion of the work, and if during the remedial work
the blocks are found to be either ungrouted or incompletely grouted, it is
the contractor’s responsibility to grout the top course of block to ensure
proper bond of the girt anchors.
5.2.4
Epoxy to be Hilti HY-150 or approved equivalent.
Work Item 6:
6.1
Recoating of exposed structural steel and welds
Existing structural steel
6.1.1
All existing steel to remain must be in good condition. If any ‘loss of
section’ or ‘pitting’ further to that noted on the project drawings is
identified, the engineer is to be consulted to determine whether repair or
reinforcement is required.
6.1.2
As noted in 3.2.1, all structural steel and remaining welds are to be
sandblasted to ‘commercial blast’ standards.
6.1.2.1
Commercial Blast SSPC-SP6 (SSI-Sa2), or NACE #3
Definition: All oil, grease, dirt, rust scale and foreign
matter are completely removed from the surface and all
rust, mill scale and old paint are completely removed by
abrasive blasting except for slight shadows, streaks or
discolorations caused by rust stain, mill scale oxides or
slight, tight resides of paint or coating that remain. If the
surface is pitted, slight residue of rust or paint may be
found in the bottom of pits; at least two-thirds of each
TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
Scope of Work
Page 7 of 20
square inch of surface area shall be free of all visible
residues and the remainder shall be limited to the light
residues mentioned above.
6.1.3
Coat all blasted steel and welds with two coats Amercoat 68HS zinc-rich
primer in accordance with manufacturer’s written instructions.
6.1.4
6.2
Refer to 1/S7 for minimum extents of priming.
New structural steel and welds
6.2.1
New steel and welds are to be coated prior to onset of surface rust
(recommended within 7 days of installation).
6.2.2
Coat all blasted steel and welds with two coats Amercoat 68HS zinc-rich
primer, or approved equivalent, in accordance with manufacturer’s written
instructions.
Work Item 7:
7.1
New uplift and lateral bracing
Steel sidewall bracing is not adequately anchored to resist the lateral and uplift
forces imposed by the environmental loads. Additional steel tie-downs and
concrete piers and footings are required.
7.1.1
Excavate and install new footings as shown on drawings. Tie new footings
to existing strip footing by drilling and epoxying 10M bars 6” into existing
footing.
7.1.2
Install new concrete piers as shown on drawings.
7.1.3
Install new steel tension columns complete with cast-in anchor bolts to top
of concrete pier.
7.1.4
Provide welded plate connection to existing steel column.
7.2
Install new X-bracing between new tension columns.
7.3
Backfill with granular A and compact to minimum 98% SPDD.
7.4
Provide shop drawings for all structural steel prior to fabrication.
Work Item 8:
8.1
New guard between field and bleachers
The existing guard is not performing as required by current design codes and
standards. A new steel guard must be installed as per the attached drawings.
8.1.1
Remove the top three (3) courses of block from the existing guard.
TE-19163-11
March 2011
Hastings Stadium
Structural and Maintenance Remedial Work
8.1.2
Scope of Work
Page 8 of 20
Grout the top two (2) courses to ensure that moisture cannot penetrate the
top of the block wall.
8.1.3
Provide floor deck extension from top of block wall to existing steel deck.
8.1.4 Install the new steel guard system as illustrated on the attached drawings.
8.1.5
The guard will be provided by the City. Contractor is responsible to
coordinate installation of posts and footings with railing shop
drawings prior to excavation.
Work Item 9:
9.1
Interior storage mezzanine upgrades
The existing mezzanine is not structurally adequate to support 4.80 kPa (100 psf)
live load. Reinforce floor framing by doubling existing 2x8 joists (refer to
attached plan). Provide a single row of blocking / bridging at mid-span.
9.2
Existing wood-framed stair does not meet OBC requirements. Remove and
replace with new steel stairs in accordance with OBC 2006. Provide shop
drawings prior to fabrication.
9.3
The existing guard does not meet current design standards. Remove and replace
as shown on the attached drawings, S10.
TE-19163-11
March 2011