Sears Centre Thesis Abstract
Thesis Abstract PDF
Executive Summary
The Sears Centre is the largest project that Ryan Companies US, Inc. has undertaken to date. Ryan Companies operates as the design build partner with Sears and Roebuck for the Sears Centre project. Building systems consist of shallow and deep foundations. Shallow foundations consist of 1'-0" to 6'-0" footings with a maximum height of 1'-4". Deep foundation systems are composed of 24'-0" height foundation walls accompanied with 55'-0", 1-1/4" diameter tiebacks, capable of supporting 100 kips each. Complex envelope and cladding systems consist of architectural precast panels and Type (1), (2), (3) cored insulated metal panels. Two types of superstructure systems are used to provide frame and lateral support. Precast columns, beams and rakers form the even area superstructure. Steel columns and beams provide the support frame for all elevated deck floor areas. Main air distribution system is serviced by (6) AHU equipped to hand 240,000 cfm. Main power supply is by means of 277/480 V system with 120/208 V alterative power supply.
Foundation and Shoring System
The Soil has been excavated in preparation for the 24-0 deep foundation walls. Walls of this depth have extreme amounts of lateral pressure caused by adjacent earth. In certain circumstances one option is to construct the foundation walls with a thickness of 33, it has been determined that this option is neither financially nor physically feasible. 55-0 long tie backs with an angle of entry 10ฐ will be utilize in the main shoring system to support lateral earth pressure.
Precast and Steel Superstructure System
The main concourse framing primary consist of a system of 10 pre-cast hollow core planks, pre cast beams, raker beams and rises. The pre-cast planks for the general assembly floors are accompanied with a 2 concrete topping. Horizontal structural members, i.e. beams are comprised of pre-cast concrete range in size variation from 12 x 24 to 30 x 42 square configuration. Raker beams which provide load transference to the pre-cast columns were employed for structural support of the arena bowl (stadium seating).Structural Steel framing is used on the bridge and suite level. The steel structural system for the upper arena areas comprises of a series of W 10 W 30 beams with varying sub weight. Bowed W 18 x 40 beams are used along the south side of the arena bridge level as part of the framing system for the Suite floor system.
Arena Air Distribution System
The Sears Centre Arena/ Concourse/ Suite and Common areas HVAC system is designed to supply air at a rate of 240,000 cfm. The main HVAC system is a 70/30, adjustable/ variable volume system that consist of (6) 40,000 cfm (28,000 cfm Outdoor Air) Air Handling Units located in the Northeast and Southeast roof top mechanical rooms. Each AHU is constructed of 2 thick double insulated metal wall panels. Supply air is distributed to the Arena bowl and event level via (5) 66 ุ un-insulated spiral duct. Operation tolerance restricted circular duct location to be at least 8 above the roof truss bottom chord. The air distribution system is designed to maintain 75ฐ F/ dry bulb 50% relative humidity, (70ฐ F/ dry bulb 50% relative humidity for ice events) during year long operations. Main air supply lines for the arena bowl have supply duct off-shoots that accommodate 40/20 supply diffuser size. (6) 40,000 cfm return air units are located at the perimeter of arena along the mechanical catwalk.
Power Supply System
The main power service and distribution for the Sears Centre consist of a 277/480 Volt 3-ุ, 4-wire supply service. Secondary power distribution has been sized for 120/208 Volt supply. (2) Step-down utility service transformers provides the initial 480 Volt 3-phase, 4-wire service @ 3,000 amps. The electrical spaces on the event level houses (8) transformers ranging is size from 30 KVA to 500 KVA. (2) 500 KVA transformers provide service to (2) 1600 amp panel boards which in turn each feeds (4) 800, 600, 400 and 60 amp panels respectively. One 300 KVA transformer serves a dedicated 600 amp service panel which will provide power for mechanical equipment and mobile television truck connections.
Plumbing System
Domestic cold water is sized for a peak 45,000 gpd use (~ 12,600 gpd average for 200 days). The domestic cold water supply is by means of 8 diameter water main routed via the northeast corner of the event level. Cold water distribution, in addition to domestic water service, provides irrigation water service, cold water fixture connections i.e. (food concession-kitchen areas), and make up water w/ backflow prevention to heating water, chilled water and condenser water systems. Domestic hot water service is designed to provide 140ฐ F water distribution by means of (2) 1,500 galloon, 3,000 gph indirect fired storage water to water heaters. A triplex water booster system will be used as the catalyst to facility water movement into the upper arena areas.
Conveying System
The Sears Center Conveying system is composed of (2) different types of elevator systems. The electric traction elevator operates on a 480-V, 3 ุ 60 cycle system. This electric traction elevator has a net weight restriction of 3,500 lbs and a minimum speed of 200 ft/ min. The elevator shaft extends from the depth of the event level to the height of the roof catwalk. The hydraulic elevator utilizes the same power system for its motor and hydraulic pumping unit. (2) of the (3) elevators in the Sears Centre will have a rated capacity of 3,000 lbs and employ the use of this electo-hydraulic pump system.
Ice-Rink System
The Sears Centre will contain an 85- 0 wide by 200- 0 long, 28-0 edge radii ice rank design to serve events sized for a 9,000 patron seat configuration. Rink perimeter slab provisions are (86-2 x 201-2 with a 28-7 edge radii for a ฑ 3/16 tolerance for the 20 rink edge.). Ice-rink ambient temperatures are designed for a 70ฐ F/ dry bulb 50ฐ F dew point temperature 48 above the ice surface. Broadcast lighting at the arena event level of ice events is will be provided @ 250 foot candles. The Ice Rink System consist of under floor heating and cooling headers and pipes, pipe chairs and valve boxes essential to ice production and maintenance. (2) 4 lifts of clean compacted sand will interact with H2O in ice production prior to ice performances and events. A 6, 5,000 psi reinforced concrete slab will supply the structural support for the arena event level/ ice-rink.