As the final game of the season at Miller park completed in September 2006, a different team of players went into action. This time the team comprises engineers who act as coaches, and the first string players were Millwrights, iron workers, operating engineers and labors. The task which they had to perform was a major repairing job on the stadium moveable roof, replacement of the ten bogies (powered carriages) on which the five movable sections of the roof are carried.

State-of-the-art-Facility

Miller Park opened its doors for Milwaukee Baseball’s fans on April 6, 2001, at South-Central Milwaukee, Wisconsin, USA with over a decade of planning and 41/2 years of constructions. This park is truly state-of-the-art facility with modern amenities and can seat 42,400 spectators through its stadium and suite seating. There are a total of 70 suites in each with spectacular views of the play on the field. There are three family sections addressing the needs of families with youngsters. As stated, a fan-friendly ballpark, Miller Park accommodates the needs of its visitors with plenty of food and beverage options, as well as an ample supply of much needed restrooms.

Overall, the Miller Park site covers 265 acres, with the building covering 25 acres. It has been noted that it would take 4,655,926,995 baseballs to fill Miller Park.

One of its Kind Convertible Roof

A signature fan-shaped convertible roof, a color replay board of epic size and four level of seating show how Miller park is one of the baseball’s crown jewels. In fact, it marked the largest construction project in Wisconsin history.

In less than 10 minutes, the convertible roof of Miller Park opens or closes in virtual silence. Reaching 200 feet above the playing field, the roof consists of seven panels, each as large as the roof of the Bradley Center in Milwaukee . Below sits the turf made of natural grass. A home run to center field in Miller Park would have to scale the 8 foot wall and clear the 400 foot distance from home plate.

Need for Repairs on Moveable Roof

As the 12.000 ton roof is designed in a fan-shape, with each of five movable sections pivoted at its home-plate end and riding on two bogies at its wide (outfield) end 183 meters away.

The 6,7 metres long original euipment bogies, two at each of the far corners of each fan-shaped roof section, were fitted with pairs of double-flanged wheels to ride on an eight inch-wide circular track approximately 42 metres above ground level. Three-phase power for the bogie drive motors is fed out along each roof section from the home plate pivot end, eliminating any need for sliding contacts.

The two double-flanged wheels on each bogie were arranged to ride the single track in an in-line fashion. Therefore, additional safety is provided by guide rollers that follow single tracks mounted on both sidewalls of the main track bed. The original-equipment bogies proved inadequate for their massive burden, and the day after the Brewers’ September home finale, the roof had left in a partially open position when a bogie guide roller shattered. Additionally, a drawback of the old bogies was that their wheel-faces were cylindrical.

As explained by the consulting engineer, the problem with the cylindrical wheel having a relatively wide bearing surface where the outside of the wheel travels farther than the inside, about 140 mm in the worst case. It was this anomaly that may have caused the snapping sound as the bogies rolled along the rail.

New Bogies with Spherical Rolling Surface

To remove the drawback related with the cylindrical wheel, it was decided to place the wheel on the new bogies having spherical rolling surfaces, to allow for minor bogie tilt, and the wheel axles are turned such that the bogie naturally follows the curved track. Additionally, the new bogie design employs four wheels arranged in two pairs, instead of the previous two-wheel design.

The new bogies are 7,3 metres long and each weighs either 49 or 66 ton, depending upon its location. They are powered by 45 kw motors via gear boxes and massive roller chains.

Process Involved in Replacement of Bogies

The replacement of each bogie was straightforward: lift the roof, remove the ld bogie, then position the new bogie and lower the roof, but doing it was a little more complicated as there was extensive work to prepare the roof panels for jacking,” says the consulting engineer, explaining that jacking brackets to lift against had to be designed, fabricated, and installed, as well as jacking platforms.

According to Millwright’s General Foreman and Project Manager for Price Erecting, contractor had also to be taken into account, lateral movement during the lifting process for much of the work. Working 183 meters from the pivot ends of the roof panels, thermal expansion and contraction were significant, and wind effects could not be ignored.

The stadium roof sections were jacked in ten separate lifts, one for each bogie replacement. Each time, the roof was lifted 102 - 152 mm, the old bogie driven out under its own power, a new bogie rolled in, and the roof lowered back into place on a spindle bearing. A 500 ton crane moved bogies to and from ground level.

Enerpac’s Hydraulics Provide Lifting Muscle

The weight lifted ranged up to about 800 ton, so a capacity safety margin was provided by using four Enerpac 300 ton, 700 bar, 300 mm stroke hydraulic cylinders for each lift. The cylinders were connected to a common manifold fed by an Enerpac 9,3 kW, 700 bar electric pump.

The jacks were equipped with lock rings to guarantee load holding, and a locking valve was used in the pump-to manifold feed line. The locking valve incorporates a check valve with a manually controlled pilot operator.

The 300 ton hydraulic jacks were a single-acting load-return type. To provide positive pull-down, the Enerpac pump setup included a valve with a venture feature to deliver negative pressure when needed. The hydraulic system was assembled and tested before being put into service. To provide for lateral movement during lifts, the jacks rested on a 38 mm thick steel plate, then a sheet of Teflon, and then a sheet of polished stainless steel.

All ten of the new bogies are in place and ready for the new seasonal 007 games. Stadium officials are proud that not one of the more than 550 events held during its six-year history has been cancelled because of weather, so they are understandably pleased at the Prospect of a much more reliably operating roof.
Click Here
To Know More or to Contact the Manufacturer
Please let us know your name.
Invalid Input
Please let us know your Designation.
Please let us know your Contact Number.
Please let us know your email address.
Please brief your query.
Our other Value-Added Services:

To receive updates through e-mail on Products, New Technologies & Equipment, please select the Product Category(s) you are interested in and click 'Submit'. This will help you save time plus you will get the best price quotations from many manufacturers, which you can then evaluate and negotiate.

Invalid Input
Invalid Input
Invalid Input
Durability is a key requirement for modern infrastructure projects – highways and roads, bridges, airports and airfields, walkways and plazas, parking structures and stadiums. Miles of concrete must

Read more ...

Buildings have major environmental impacts over their entire life cycle. Resources such as ground cover, forests, water, and energy are depleted to give way to buildings. Today, India has demonstrated

Read more ...

Scour is a natural phenomenon caused by the erosive action of flowing stream on alluvial beds. Failure of bridge due to scour at their foundations, which in this case consisted of abutments and pier, one 1.2 dia

Read more ...

To protect concrete structures like Flyovers, Bridges, Parking areas, Big Commercial and Residential Buildings, the normal decorative exterior paint will not serve the purpose as these paints are not vapour permeable

Read more ...

Repair Strategy of Stoplog Sill Beams During Operation Stage of 510 MW Teesta-V Power Station in Sikkim Running Power Stations serve as a boom to the economy of the country and any generation loss due to construction

Read more ...

Concrete protective liner is a multipurpose solution for waterproofing and protection of concrete surfaces against corrosion and destruction. The product warranties long-term and reliable protection of structures

Read more ...

Sangeeta Pandey, Chief Manager (Civil), Power Grid Corporation of India Ltd., Patna, PVS Sudhakar, Sr. General Manager (Civil), NOFN Works, Power Grid Corporation of India Ltd., Vishakhapatnam & Dr. Achintya, Professor of Civil

Read more ...

Samir Surlaker, Director, Assess Build Chem Private Limited discusses some new joint treatments and injection systems in waterproofing. It is a myth that waterproofing treatments can be carried out by application of single material

Read more ...

Years of research plus decades of practical experience have enabled FAIRMATE to develop detailed solutions to restore and rehabilitate concrete structures with structural rehabilitation, retrofitting and strengthening of RCC structures

Read more ...

Sunny Surlaker, Head Technical Services, Assess Build Chem writes on the selection ideologies, materials and methods for defect remediation in Concrete Buildings. The building façade or the envelope is the primary line of

Read more ...

This article provides some basic information on effects of fire on concrete, various condition evaluation methods, and show findings from a case study of a fire exposed concrete foundation in California, and informs construction

Read more ...

There is considerable controversy within the concrete repair industry regarding the use of bonding agents as a pretreatment method for the repair of deteriorated concrete. This paper examines the use of bonding agents

Read more ...

This paper discusses the effects of fire on concrete and provides a methodology to assess, evaluate and repair concrete structures. Though concrete is among the best fire-resistant building materials, it does get damaged when

Read more ...

The ACI 562 Code Requirements for Assessment, Repair, and Rehabilitation of Concrete Structures and Commentary was first published in 2013 and revised in 2016. Development of ACI 562 was an industry response to variations

Read more ...

The repair industry in India and for that matter, throughout the world, is like the story of an elephant described by seven blind people. Whichever part of an elephant will come in the hands of a blind man, the elephant will be described

Read more ...

The Chamera Hydro-Electric Project (Stage-III) is located on the river Ravi at village Kharamukh (250.0 m downstream of the confluence of river Ravi and Tundah Nala) in Chamba district of Himachal Pradesh. The Project consists

Read more ...

Terex — a diversified global manufacturer of equipment for mining and quarrying industries — is celebrating 10 years of operations in India and has announced expansion plans for its 45-acre manufacturing plant in Hosur, with which it plans

Read more ...

The rapid boom in the construction industry, has tremendously given rise to the demand for sand, causing deficiency of suitable river sand in many parts of India. Besides, river mining causes imbalance in the river bed water flow, and

Read more ...

Regardless of the quality of pavement material and design, increase in vehicular traffic and changing environmental conditions will reduce the service life of pavements and ultimately result in their failure. The causes and

Read more ...

With the increase in construction of buildings in the last two decades, it has been observed that many of the structures are already showing signs of distress. In some cases, repair measures become necessary even within a span

Read more ...

×
Sign-up for Free Subscription
'India Construction Week'
Weekly e-Newsletter on Construction Industry
Get the latest news, product launches, projects announced / awarded, government policies, investments, and expert views.