Case Histories: Construction
Biach engineers respond to one of a kind problems encountered by customers in many diverse industries. |
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Torus Suport Assembly |
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Customer: CBI / Fitzpatrick Nuclear Plant
Problem: For the bolting up of the Torus supports, Chicago Bridge and Iron could not get accurate loading of anchor bolts using torque wrenches.
Solution: Biach provided tensioners which provided a test load of 170 kips and a residual load of 150 kips to the 2" anchor bolts. |
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Anchor Bolting |
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Customer: TVA / Hartsville and Phipps Bend Nuclear Plants
 Problem: Customer installed 75 to 100 anchor bolts a day. They were concerned about speed and repeatability.
Solution: Using Biach tensioners they installed the anchor bolts 2.5 times faster than they had estimated.
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Steel Work |
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Customer: RCA / Karl Koch Erectors
  Problem: Bolted tower on top of the World Trade Center (NYC) had to withstand winds of 300 mph. High strength alloy steel bolts had to be stressed to 125K psi to provide the needed strength. Axial loading was the only method to achieve this requirement. Steelwork clearances limited access of equipment.
Solution: Biach developed and built a series of high capacity tensioners to provide the required loads for studs from 1" to 3". |
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Pre-stressing Concrete Bridges |
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Customer: DYWIDAG
 Problem: In the fabrication of large concrete structures, such as bridges, towers, skyscrapers, walls, etc., threaded bar tie rods must be pre-tensioned prior to pouring concrete. The load on the bars must be accurate and uniform to prevent cracking of the concrete after it cures.
Solution: Biach designed a series of tensioners to provide this accurate stud loading on this unusual threaded design. |
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Nuclear Vessel Construction – Internals Assembly |
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Customer: P.F. Avery
 Problem: Inaccessible stainless steel tubes had to be loaded. There were no tools available.
Solution: Biach designed and built a special remote loading device having a split puller bar which loaded the tubes and ran down their nuts. |
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Hanger Construction - Tie Rod Tensioning |
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Customer: Herrick / Boeing
 Problem: Customer designed and was building a hanger for the new Boeing 747. The roof was supported by a series of many tie rods, which required axial loading.
Solution: Biach provided a tensioner for the two ¼" studs with adapters to address four other stud sizes. The tensioner had a 1" stroke to allow for elongation of the tie rods. |
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Power Plant Construction – Chimney Anchorage |
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Customer: Union Boiler Company
 Problem: Customer had to anchor a very tall smoke stack for a fossil plant. Government regulations required accurate anchor bolt loading.
Solution: Biach provided a 380,000 lb. capacity tensioner to properly load the bolts. |
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Mining and Tunnel Construction – Drilling Large Holes |
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Customer: Reed Tool Company
 Problem: In the boring of tunnels, large rotating blades having carbide bits, cut through such hard materials as granite, coal, rocks, etc. This induces tremendous vibration and stress to the bolted joints.
Solution: To prevent the drill bits from working loose during the drilling operation, Biach provided high capacity, short stroke tensioners. |
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Mining – Rotating Gear Segment Mounting |
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Customer: Marion Power Shovel
 Problem: Continual operation required checking and re-tightening mounting bolts.
Solution: Biach designed a special tensioner to address this application for this customer and the original equipment manufacturer – Marion Power Shovel. |
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Pipe Supports in Nuclear Plants |
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Customer: Pullman Power Products
Problem: Customer was looking for a method of simultaneously and accurately loading studs on pipe clamps.
Solution: Biach provided six sizes of tensioning systems for clamps using 1/2" to 2" diameter bolts for suspension of pipes ranging in sizes from 6" to 24" in diameter.
Note: Biach has also addressed Graylok Clamps. |
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