NCHRP Synthesis 396 â Monitoring Scour Critical Bridges - TSP2

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143 Location: Bridge B-839S, I-15 at California Wash Bridge Phone #: 702-720-3037 B-839S SCOUR MONITORING DEVICE DATA Sonar installed on upstream nose of easternmost pier (pier 4). One channel 1 float-out installed 3 feet deep in 6 foot riprap layer at upstream nose of easternmost pier (pier 4). One channel 2 float-out installed 3 feet deep in 6 foot riprap layer at each upstream nose of center pier (pier 3) and westernmost pier (pier 2). Elevation data from contract 1108 and field measurements during installations: Piers bottom of bridge: 1818.7± top of pier walls (upstream nose): 1818.3 (pier 2), 1817.9 (pier 3), 1817.6 (pier 4) top of spread footings: 1806.3 (piers 2 & 4), 1806.7 (pier 3) bottom of spread footings: 1805.0 Sonar (This data is programmed in the monitoring equipment) sonar transducer elevation: 1812.0 ground elevation (riprap) referenced by sonar at time of installation: 1810.0± elevation readings that trigger successive pager/computer calls: 1808.0, 1805.0 Float-Outs ground (riprap) elevation at float-out locations at time of installation: 1810.0± float-out elevation: 1807.0± Location: Bridge B-839S, I-15 at California Wash B-839S SCOUR RESPONSE PLAN Scour Event Pager Message: "839, California Wash” [false alarm if 839 is missing or different] Pager Group Members: Phone # Cell Phone # Maintenance Supervisor 1 Maintenance Supervisor 2 Maintenance Superintendent District Maintenance Engineer Principal Bridge Maintenance Engineer Responses to Sonar Calls: First call at elevation reading of 1808.0 Scour Location: 2.0' into 6.0' riprap layer (scour depth = 2.0') Response: Mobilize to monitor and potentially close bridge Second call at elevation reading of 1805.0 Scour Location: Bottom of spread footing (scour depth = 5.0') Response: Close bridge Responses to Float-Out Calls: First call from channel 1 float-out Scour Location: Nose of east pier at midpoint of 6.0' riprap layer (scour depth = 3.0') Response: Mobilize to monitor and potentially close bridge First call from channel 2 float-out Scour Location: Nose of center or west pier at midpoint of 6.0' riprap layer (scour depth = 3.0') Response: Mobilize to monitor and potentially close bridge
144 Second call from channel 2 float-out Scour Location: Nose of center or west pier at midpoint of 6.0' riprap layer (scour depth = 3.0') Response: Mobilize to monitor and potentially close bridge B-1805 SCOUR MONITORING DEVICE DATA Location: Bridge B-1805, FAS 159 (W. Charleston Blvd.) at Red Rock Wash Bridge Phone #: 702-720-3039 (3038?) Sonar installed on upstream nose of pier. Two channel 1 float-outs installed just downstream of pier. Two channel 2 float-outs installed just downstream of bridge ±15 ft. from north abutment toe. Elevation data from contract 2103 and field measurements during installations: Pier bottom of bridge at pier: 3217.2 top of pier pile cap: 3194.5 bottom of pier pile cap: 3191.0 pier pile tip (cast in drilled hole concrete pile): 3179.0 North Abutment bottom of bridge at abutment: 3216.9 top of abutment pile cap: 3212.5 bottom of abutment pile cap: 3210.3 abutment pile tip (cast in drilled hole concrete pile): 3186.0 Sonar (This data is programmed in the monitoring equipment) sonar transducer elevation: 3209.9 ground elevation (in riprap mound) referenced by sonar at time of installation: 3207.5 elevation readings that trigger successive pager/computer calls: 3195.0, 3185.0 Pier Float-Outs ground elevation at pier float out location at time of installation: 3205.2 upper pier float-out elevation: 3195.2 lower pier float-out elevation: 3185.2 Abutment Float-Outs ground elevation at abutment float out location at time of installation: 3202.3 upper abutment float-out elevation: 3192.3 lower abutment float-out elevation: 3185.3 B-1805 SCOUR RESPONSE PLAN Location: Bridge B-1805, FAS 159 (W. Charleston Blvd.) at Red Rock Wash Scour Event Pager Message: "1805, Red Rock Wash" [false alarm if 1805 is missing or different] Pager Group Members: Phone # Cell Phone # Maintenance Supervisor 1 Maintenance Supervisor 2 Maintenance Superintendent District Maintenance Engineer Principal Bridge Maintenance Engineer
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NCHRP NATIONAL COOPERATIVE HIGHWAY
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NATIONAL COOPERATIVE HIGHWAY RESEAR
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The National Academy of Sciences is
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FOREWORD Highway administrators, en
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53 CHAPTER EIGHT CONCLUSIONS Synthe
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2 FIGURE 1 Causes of bridge failure
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4 (TRIS), the U.S. Geological Surve
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6 TABLE 1 TYPES OF FIXED SCOUR MONI
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8 FIGURE 6 Detail of conduit to und
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10 Sounding Rods, also known as BRI
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12 80 70 Note: Number of bridge sit
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14 FIGURE 17 States with fixed scou
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16 TABLE 2 (continued) State Georgi
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18 TABLE 3 (continued) State N ew M
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TABLE 4 (continued) State Arkansas
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22 TABLE 5 BRIDGE SITES WITH FIXED
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24 40 35 Number of Installations 30
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26 FIGURE 24 Underwater sonar brack
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28 can turn into rapidly flowing ri
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30 TABLE 6 ESTIMATED COST INFORMATI
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32 depths with existing scour formu
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34 The states also found the need t
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36 Appendix G contains sample progr
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38 such as Microsoft Excel. Sample
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40 FIGURE 32 Active streambed monit
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42 including sending false alarms a
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44 FIGURE 43 Remote station, solar
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46 FIGURE 46 General elevation of K
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48 Alaska The Knik River near Palme
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50 Georgia The Georgia DOT report c
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52 using thermocouples spaced along
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54 TABLE 7 FIXED INSTRUMENTATION SU
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56 future repair costs, especially
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58 A clear chain of command of thos
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60 FHWA LTBP The FHWA initiated a m
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62 REFERENCES Avila, C.M.C., J.A. R
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64 BIBLIOGRAPHY Blodgett, J.C., Mon
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66 APPENDIX A Survey Appendix A con
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68 Section 1 1.1 Agency/Organizatio
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70 Section 5 Design and Installatio
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72 6.18 Have analyses and/or tests
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APPENDIX B Survey Respondents State
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76 APPENDIX C Summary of Survey Res
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78 2.4 What innovations/advancement
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80 NJ (1)—30,000 NJ (2)—70,000
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82 FL—120 ft (District 2) HI (1)
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84 3.17 What is the foundation type
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86 HI (1)—2/1/04; Q = 930 cfs; 2-
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88 AK (2.12)—$10,000 materials, $
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90 5.9 Do the monitors have an auto
Page 101 and 102: 92 6.3 How often is the data collec
Page 103 and 104: 94 6.10 How is the data used, and w
Page 105 and 106: 96 AR—Sonar can be checked agains
Page 107 and 108: 98 7.7 Who repairs the scour monito
Page 109 and 110: 100 8.5 Were there any additional p
Page 111 and 112: 102 APPENDIX D Bridges with Fixed S
Page 113 and 114: TABLE D3 MONITORED SCOUR CRITICAL B
Page 117 and 118: 10.00 0.00 -10.00 -20.00 -30.00 -40
Page 120 and 121: 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0
Page 122 and 123: -5 -10 -15 -20 -25 -30 -35 Scour De
Page 124 and 125: -16 -17 -18 -19 -20 -21 -22 -23 -24
Page 126 and 127: Sonar Scour Monitor Data for Wantag
Page 128 and 129: 119 APPENDIX F Case Studies Abbrevi
Page 130 and 131: 121 30 N. Abutment Pier Number S. A
Page 132 and 133: 123 APPENDIX G Available Plans, Pro
Page 134 and 135: 125 4. ALERT DEPTH If the “Alert
Page 136 and 137: 127 TABLE OF CONTENTS 1. Descriptio
Page 138 and 139: 129 3. Recording of a “no lock”
Page 140 and 141: The Regional Structures Engineer sh
Page 142 and 143: While continuing to encourage DOTs
Page 144 and 145: A Scour Monitoring General Inspecti
Page 146 and 147: 137 16. CONTACTS Each bridge locati
Page 148 and 149: 139 Nevada Department of Transporta
Page 150 and 151: 141 Location: Bridge B-420, US 95 a
Page 154 and 155: 145 Responses to Sonar Calls: First
Page 156 and 157: 147 4. RECOMMENDED ACTION(S) (see S
Page 158: 149 Emergency repair plans (include
Page 162 and 163: 153 Functional Applications Local S
Page 164 and 165: Bridge owners to facilitate their e
Page 166 and 167: 157 DRAFT RESEARCH PROBLEM STATEMEN
Page 168: Abbreviations used without definiti
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NCHRP Synthesis 396 â Monitoring Scour Critical Bridges - TSP2