foreword - DOT On-Line Publications - Department of Transportation

Shotcreting a Permanent Structural Shotcrete Wail
Page
P39. Nozzleman Gunning Prequalification Test Panels . . . . . . . . . . . . . . . . . . . . . . 43
P40. Nozzleman Applying Shotcrete and Blow Pipe Removing Rebound . . . . . . . . . . 43
P41. Rough Screeding Shotcrete Face . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
P42. Final Hand Texturing with Rubber Float . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
P43. Completed Permanent Structural Shotcrete Wall Prior to Painting, I-5, Tacoma, WA43
P44. Completed Permanent Structural Shotcrete Wall After Painting, I-5, Tacoma, WA 43
Nail Testing
P45. Typical Nail Testing Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Problem Solving on Construction
P46. Mass Excavation and Stabilizing Berm .............................. 60
P47. Drilling Through Stabilizing Berm ................................. 60
P48. Excavating Stabilizing Berm After Nails Installed ...................... 60
P49. Exhuming A Failed Sacrificial Test Nail ............................ 67
P50. Exhumed Test Nail with Inadequate Grouting ......................... 67
Handling Difficult Ground
P51. Drilling Through Shotcrete Facing Due to Caving Ground ................ 80
P52. False Form to Repair Excavation Face Slough ........................ 80
P53. Backfilling Void Behind False Form ............................... 80
P54. Use of Segmental Slot Excavation to Prevent Face Sloughing .............. 80
P55. Shotcrete and Excavation to Finish Face in Segmental Slot Excavations ...... 80
P56. Completed Shotcrete Face Closure in Segmental Slot Excavations ........... 80
P57. Use of PVC Pipe Weepholes Through Shotcrete Face in Heavy Seepage Areas . 81
P58. Drain Strips over Weepholes on Shotcrete, Face ....................... 81
P59. Close-up of Drain Strip on Shotcrete Face ........................... 81
P60. One Example of Dispute Resolution ............................... 81
Photo Credits - Photographs in this manual were compiled by the FHWA Region 10 Office
of Structures. Photos illustrating construction problems are intentionally
not credited. Other photos were provided courtesy of:
Pl, 18, 19, 24, 25, 28, 31-37, 46-48 (CALTRANS);
P2, 3, 5, 16, 23, 27 (CALTRANS/FHWA);
P4, 7, 17, 35, 41,43, 44 (WASHINGTON DOT/FHWA);
P6, 57, 58, 59 (SCHNABEL FOUNDATION CO.);
~13, 14,’ is, 26 (GILDER ASSOCIATES);
P9, 10, 29, 38 (VIRGINIA DOT/FHWA);
Pl 1, 30, 40,42 (OREGON DOT);
P12, 39, 45 (OREGON DOT/FHWA);
P8 (TEXAS DOT);
P22 (KULCHIN-CONDON & ASSOCIATES).
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