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Inspection Detail

Case Status: CLOSED
Inspection: 508219.015 - Harrison Hoist, Inc.

Inspection Information - Office: Dallas

Nr: 508219.015Report ID: 0626300Open Date: 07/07/2012

Harrison Hoist, Inc.
800 W. Campbell Rd.
Richardson, TX 75080
Union Status: Union
SIC:
NAICS: 238990/All Other Specialty Trade Contractors
Mailing: 105 Keystone Drive, Telford, PA 18969

Inspection Type:Fat/Cat
Scope:Complete Advanced Notice:N
Ownership:Private
Safety/Health:Safety Close Conference:09/26/2012
Emphasis: L:Crane, L:Constr6Close Case:12/19/2012

Related Activity:TypeIDSafetyHealth
 Accident436730    
Case Status: CLOSED

Violation Summary
Serious Willful Repeat Other Unclass Total
Initial Violations 6 6
Current Violations 4 4
Initial Penalty $29,400 $0 $0 $0 $0 $29,400
Current Penalty $15,680 $0 $0 $0 $0 $15,680
FTA Amount $0 $0 $0 $0 $0 $0

Violation Items
# ID Type Standard Issuance Abate Curr$ Init$ Fta$ Contest LastEvent
Deleted 1. 01001 Serious 19261404 H12 11/20/2012 11/29/2012 $0 $4,900 $0 I - Informal Settlement
  2. 01002 Serious 19261406 A01 11/20/2012 11/29/2012 $3,920 $4,900 $0 I - Informal Settlement
  3. 01003 Serious 19261406 A02 11/20/2012 11/29/2012 $3,920 $4,900 $0 I - Informal Settlement
Deleted 4. 01004 Serious 19261406 A03 11/20/2012 11/29/2012 $0 $4,900 $0 I - Informal Settlement
  5. 01005 Serious 19261406 B 11/20/2012 11/29/2012 $3,920 $4,900 $0 I - Informal Settlement
  6. 01006 Serious 19261430 D 11/20/2012 11/29/2012 $3,920 $4,900 $0 I - Informal Settlement

Accident Investigation Summary
Summary Nr: 22015.015Event: 07/07/2012Two Employees Are Killed When Tower Crane Mast Collapse
At 3:20 p.m. on July 7, 2012, Employees #1 and #2 were standing in the proximity of the top tower section and awaiting on the Terex Peiner, (Model SK 415) Tower Crane to hoist the rigging needed to lower the top section to the ground. The mast stood eleven tower sections high or approximately 220 feet high with the top section connected to a climbing adapter section. Each tower section was approximately 196- in length and weighed 9,300 lbs. Each tower section consisted of four corners and each corner consisted of two connecting points. One connecting point was located on the outside of the flange and the second one was located on the inside of the flange. Eight connecting elements (mast bolts) connected two tower sections at their connecting points such that the bottom tower section (tower section one) was anchored to the foundation by eight mast bolts and the bottom of tower section two was anchored to the top of tower section one by eight mast bolts. The sequence continued on all tower sections and climbing adapter section. Prior to the accident the jib, counterweights, and turning table/cab assembly had been removed. Prior to dismantling of the mast the employer removed mast bolts from every other tower section and placed these in their respective carriers. Some of the remaining bolts were also de-torqued. Five bolts were removed from the bottom of tower section two and placed in their respective carriers. Two bolts were removed from the NE corner and two bolts were removed from the SE corner leaving the east section of the mast at the bottom of tower section two unsupported. Prior to the accident a weather system began to move into the area. Immediately prior to the accident wind gusts of approximately 36 mph came into contact with the mast, At 3:20 p.m., wind gusts of approximately 36 mph came into contact with the mast causing the mast to hinge west between tower sections one and two. As the mast continued to lean west its center of gravity shifting beyond its tipping point causing the upper eleven sections of the mast to fall and collapse. The top section of tower section three collapsed on a concrete wall. The upper tower sections continued their descending trajectory collapsing on a steel structure anchored to the roof; killing both employees. The adapter unit collapsed on a concrete wall to the west of the steel structure. Both employees sustained blunt force injuries and were killed.
Keywords: structural collapse, rigging, hoist, crane counterweight, crane, collapse, tower
Inspection Degree Nature Occupation
1 508219.015 Fatality Fracture Millwrights
2 508219.015 Fatality Fracture Millwrights

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