Lesson 7 REINFORCING CAGE. Version 1-1/
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1 Lesson 7 REINFORCING CAGE 7-1 Version 1-1/15 7-1
2 Learning Outcomes Describe cage construction Determine the circumference of a shaft and rebar cage and calculate the required number of side spacers. Explain how to assess the Contractor s compliance with cage construction/placement requirements Verify CSL tube placement and condition Identify the applicable 455 Specifications 7-2 Version 1-1/15 7-2
3 Checklist 7-3 Version 1-1/15 7-3
4 Reinforcing Steel Reinforcing Steel: Meet the reinforcing steel requirements of Section 415. Ensure that reinforcing steel is in accordance with the sizes, spacing, dimensions, and the details shown in the plans. 7-4 Version 1-1/15 7-4
5 Reinf. Steel Const. & Placement Cage Construction and Placement: Completely assemble and place as a unit the cage of reinforcing steel, consisting of longitudinal bars, ties, and cage stiffener bars, immediately after the Engineer inspects and accepts the shaft excavation and immediately prior to placing concrete. Tie all intersections of drilled shaft reinforcing steel with cross ties or figure 8 ties. Use double strand ties or ties with larger tie wire when necessary. The Engineer will give final approval of the cage construction and placement subject to satisfactory performance in the field. 7-5 Version 1-1/15 7-5
6 Reinf. Steel Const. & Placement 7-6 Version 1-1/15 7-6
7 Reinforcing Cage C/L DRILLED SHAFT 7-7 Version 1-1/15 7-7
8 Reinforcing Cage Longitudinal Bars Transverse or Tie Bars Instrumentation 7-8 Version 1-1/15 7-8
9 Reinforcing Cage Ties 7-9 Version 1-1/15 7-9
10 Splicing Cage Splicing Cage: If the bottom of the constructed shaft elevation is lower than the bottom of the shaft elevation in the plans, extend a minimum of one half of the longitudinal bars required in the upper portion of the shaft the additional length. Continue the tie bars for the extra depth, spaced on 2 foot centers, and extend the stiffener bars to the final depth. The Contractor may lap splice these bars or use unspliced bars of the proper length. Do not weld bars to the planned reinforcing steel unless shown in the Contract Documents Version 1-1/
11 Splicing Cage Splicing Cage (cont ed) For drilled shafts supporting mast arms, cantilever signs, overhead truss signs, high mast light poles or other miscellaneous structures, if the shaft cleaning operations result in excavating below the required tip elevation, the reinforcing steel cage does not need to be extended. The reinforcing steel cage may be spliced to rest on the bottom of the excavation or suspended in place from the top Version 1-1/
12 Spliced Cages Note the extended bars Version 1-1/
13 Spliced Cages Mechanical Couplers Staggered splices 7-13 Version 1-1/
14 Support, Alignment & Tolerance Support, Alignment, and Tolerance: Tie and support the reinforcing steel in the shaft so that the reinforcing steel will remain within allowable tolerances as specified in and Section 415. Use wheels or other approved noncorrosive spacing devices within 3 feet of the bottom, within 6 feet of the top, and intervals not exceeding 10 feet along the shaft to ensure concentric spacing for the entire length of the cage. Do not use block or wire type spacers. Use a minimum of one spacer per 30 inches of circumference of cage with a minimum of four at each level 7-14 Version 1-1/
15 Side Spacers Within 6 ft. of top, 12 inch diameter spacers (recommended) Spacers Shaft wall Cage 6 Min. Max. 10 ft. intervals up the shaft Within 3 ft. of the bottom Bottom Spacers 6 Cover 7-15 Version 1-1/
16 Side Spacers 7-16 Version 1-1/
17 Typical Side Spacers 7-17 Version 1-1/
18 Typical Side Spacers 7-18 Version 1-1/
19 Typical Side Spacers 7-19 Version 1-1/
20 Number of Side Spacers Support, Alignment, and Tolerance:..near the bottom, within 3 ft of the bottom, within 6 feet of the top, and intervals not exceeding 10 feet along the shaft to ensure concentric spacing for the entire length of the cage... Use a minimum of one spacer per 30 inches of circumference of cage with a minimum of four at each level. Need to Know Length of shaft Circumference of cage To Determine Number of rows Number of spacers per row Total of spacers=# rows x # spacers/row 7-20 Version 1-1/
21 Circumference of a Circle Circumference (C) = D Where: C = circumference D = diameter = 2 times radius = PROBLEM What is the circumference of the shaft in: 36 dia. C = D C = C = 7-21 Version 1-1/
22 Circumference of a Cage Circumference (C) = D 48 dia. Reinforcing cage Where: Diameter of cage = Shaft diameter minus 2 times the Concrete cover D = diameter = 2 times radius = PROBLEM What is the circumference of the reinforcing cage? 6 Concrete cover 7-22 Version 1-1/
23 Number of Side Spacers SAME CIRCUMFERENCE AS PREVIOUS PAGE PROBLEM How many side spacers are required for this shaft? 56 Rows Number of spacers per row = 7-23 Version 1-1/
24 Support, Alignment & Tolerance Support, Alignment, and Tolerance: Continued. Provide spacers at the bottom of the drilled shaft reinforcing cage as required to maintain the proper position of the cage 724 Version 1-1/
25 Support, Alignment & Tolerance Support, Alignment, and Tolerance: Continued Check the elevation of the top of the steel cage before and after placing the concrete. If the rebar cage is not maintained within the specified tolerances, correct it as directed by the Engineer. Do not construct additional shafts until modifying the rebar cage support in a manner satisfactory to the Engineer Version 1-1/
26 Typical Standoffs (Bottom Spacers) 7-26 Version 1-1/
27 Typical Standoffs (Bottom Spacers) 7-27 Version 1-1/
28 Side Spacers & Standoffs 7-28 Version 1-1/
29 Learning Outcomes What are the side spacers used for? What are the bottom spacers used for? 7-29 Version 1-1/
30 Learning Outcomes What percentage of intersections on the cage are to be tied? How many side-spacers are required per row on the cage? 7-30 Version 1-1/
31 Reinforcement Storage Should not be stored in contact with soil Keep away from oil or other deleterious materials Adequate supports provided during storage & lifting 7-31 Version 1-1/
32 Reinforcement Cage Handling 7-32 Version 1-1/
33 Reinforcement Cage Handling 7-33 Version 1-1/
34 Common Reinforcement Cage Issues 7-34 Version 1-1/
35 Common Reinforcement Cage Issues 7-35 Version 1-1/
36 Cross-hole Sonic Logging Tubes 7-36 Version 1-1/
37 CSL Tubes Cross-Hole Sonic Logging (CSL) Tubes: Install CSL access tubes full length in all drilled shafts from the tip of shaft to a point high enough above top of shaft to allow CSL testing, but not less than 30 inches above the top of the drilled shaft, ground surface or water surface, whichever is higher. Equally space tubes around circumference of drilled shaft. Securely tie access tubes to the inside of the reinforcing cage and align tubes to be parallel to the vertical axis of the center of the cage. Access tubes from the top of the reinforcing cage to the tip of the shaft shall be NPS 1-1/2 Schedule 40 black iron or black steel (not galvanized) pipe. Access tubes above the top of the reinforcing cage may be the same black iron or black steel pipe or Schedule 80 PVC pipe. Ensure that the CSL access tubes are free from loose rust, scale, dirt, paint, oil and other foreign material. Couple tubes as required with threaded couplers, such that inside of tube remains flush Version 1-1/
38 CSL Tubes Cross-Hole Sonic Logging (CSL) Tubes: Continued. Seal the bottom and top of the tubes with threaded caps. The tubes, joints and bottom caps shall be watertight. Seal the top of the tubes with lubricated, threaded caps sufficient to prevent the intrusion of foreign materials. Stiffen the cage sufficiently to prevent damage or misalignment of access tubes during the lifting and installation of the cage. Repair or replace any unserviceable tube prior to concreting. Exercise care in removing the caps from the top of the tubes after installation so as not to apply excess torque, hammering or other stress which could break the bond between the tubes and the concrete Version 1-1/
39 CSL Tubes Cross-Hole Sonic Logging (CSL) Tubes: Continued. Provide the following number (rounded up to the next whole number of tubes) and configuration of crosshole sonic logging access tubes in each drilled shaft based on the diameter of the shaft. Shaft Diameter Number of Tubes Required Configuration Around the inside Of Circular Reinforcing Cage 36 to 48 inches 4 90 degrees apart Greater than 48 inches 1 tube per foot of shaft Diameter 360 degrees divided by the number of tubes 7-39 Version 1-1/
40 CSL Tubes Cross-Hole Sonic Logging (CSL) Tubes: Continued Insert simulated or mock probes in each cross-holesonic access tube prior to concreting to ensure the serviceability of the tube. Fill access tubes with clean potable water and recap prior to concreting. Repair or replace any leaking, misaligned or damaged tubes as in a manner acceptable to the Engineer prior to concreting Version 1-1/
41 CSL Tubes Cross-Hole Sonic Logging (CSL) Tubes: Continued For drilled shafts supporting mast arms, cantilever signs, overhead truss signs, high mast light poles, or other miscellaneous structures, if the shaft cleaning operations result in excavating below the required tip elevation, the CSL tubes do not need to be extended. If the reinforcing steel cage is suspended in place from the top rather than resting on the bottom of the excavation, clearly mark the top of shaft location on each tube Version 1-1/
42 CSL Tubes 7-42 Version 1-1/
43 CSL Tubes 7-43 Version 1-1/
44 , Inspection Form 7-44 The Inspector is to compete the Drilled Shaft Log portion related to the Reinforcing Cage, which is located in the page 2 of the Drilled Shaft log. In addition, the inspector is to complete form , presented in the next slide. As mentioned earlier, the must check the constructed cage against the plans and if everything matches, you would check Yes. If not check No and place your comments in the Comment section below. Remember to check for: 1. Proper # Vertical Bars does the number of bars and their size, match the plans? 2. Proper # Horizontal Bars- does the number of bars and their size match the plans? 3. Side Standoffs (spacers)- is the correct number (total and per row) in place? 4. Bottom Standoffs- does the number and the clearance from bottom of shaft to bottom of cage match the plans? 5Epoxy Condition- Epoxy is no longer used so that should be N/A. 6. Ties & Connections- are the ties (number or percentage) as specified in the plans. Use Comments section to provide any details. Version 1-1/
45 , Inspection Form Drilled Shaft Reinforcement/ spacers/ log 7-45 In addition to do the checkings in form the Inspector needs to compete the Drilled Shaft Reinforcement/Spacers/ Log to document CSL access tubes, spacers used, reinforcement diameters and length and extensions used. In this form the inspector documents the reinforcement, CSL and spacers observed. Items such as, bar size, lengths, CSL number of tubes, distances between spacers rows, etc, are recorded in this form. Version 1-1/
46 The Cage 7-46 Version 1-1/
47 Learning Outcomes Describe cage construction Determine the circumference of a shaft and rebar cage and calculate the required number of side spacers. Explain how to assess the Contractor s compliance with cage construction/placement requirements Verify CSL tube placement and condition Identify the applicable 455 Specifications 7-47 Version 1-1/
48 Questions? ANY QUESTIONS? 7-48 Version 1-1/
49 STATE OF FLORIDA DEPARTMENT OF TRANSPORTATION CONSTRUCTION DRILLED SHAFT REINFORCEMENT/SPACERS/LOG 10/13 Project Name: FIN Project No.: Contractor: Inspected by: Approved by: TIN # (Project Admin Or Permit Manager) Date: Date: Page Pier No. Shaft I.D. or # Station Offset (ft) Bridge Structure # Cage Dia. (in) = 1) CSL TUBES (a) Number of CSL Tubes Installed = (b) Inside Diameter of CSL Tubes (in) = (c) Length of CSL Tubes (ft) = (measure each after installation) (d) Extension above shaft provided (in) = (Note 1) 2) d 1 = d 6 = d 11 = Side Spacers Tie-Bars d 5 d 4 d 2 = d 7 = d 12 = d 3 = d 8 = d 13 = d 4 = d 9 = d 14 = L l d 5 = d 10 = d 15 = d 3 3) 4) 5) Number of Spacers /Row = Number of rows= Number of bottom spacers = Bottom of CSL Tubes=Bottom of d 2 d 1 6) Number of longitudinal rebars = 7) Longitudinal Rebar Diameter = 8) L l = Longitudinal Rebar Length = 9) Transverse Rebar Diameter. = 10) Was Bottom of cage extended? IF YES: (a) Number of Long. Bars Extended= (b) Extension Length (ft) = (c) Number of Additional Tie-bars = Yes No 1 11) 12) 13) Number of Anchor Bolts= Anchor Bolts length= Anchor Bolts diameter= 14) Were all the intersections tied with Yes No cross ties or "figure 8" ties? 1 Comments: Note 1: In misc. shafts, explain here how the contractor provided the CSL access tubes extension for testing:
50
51 STATE OF FLORIDA DEPARTMENT OF TRANSPORTATION CONSTRUCTION DRILLED SHAFT REINFORCEMENT/SPACERS/LOG 10/13 Project Name: FIN Project No.: Contractor: Inspected by: Approved by: Example xxxxxx xxxxxx xxxxxx TIN # xxxxx xxxxxx (Project Admin Or Permit Manager) Date: Date: Page Pier No. Shaft I.D. or # Station Offset (ft) Bridge Structure # Cage Dia. (in) = 36" 1) CSL TUBES (a) Number of CSL Tubes Installed = (b) Inside Diameter of CSL Tubes (in) = 4 1.5" (c) Length of CSL Tubes (ft) = (measure each after installation) (d) Extension above shaft provided (in) = (Note 1) NA 76 NA 76 NA 76 NA 76 NA NA 164" 2) d 1 = 2' d 6 = 10' d 11 = NA Side Spacers d 5 d 2 = 10' d 7 = 8' 1" d 12 = d 3 = 10' d 8 = NA d 13 = NA NA Tie-Bars d 4 d 4 = 10' d 9 = NA d 14 = L l d 5 = 10' d 10 = NA d 15 = NA NA d 3 3) 4) 5) Number of Spacers /Row = 4 Number of rows= 7 Number of bottom spacers = 5 Bottom of CSL Tubes=Bottom of d 2 d 1 6) Number of longitudinal rebars = 7) Longitudinal Rebar Diameter = 8) L l = Longitudinal Rebar Length = 14 # ) Transverse Rebar Diameter. = #5 Yes No 10) Was Bottom of cage extended? x IF YES: (a) Number of Long. Bars Extended= (b) Extension Length (ft) = (c) Number of Additional Tie-bars = NA NA NA 11) 12) 13) Number of Anchor Bolts= Anchor Bolts length= Anchor Bolts diameter= NA NA NA 14) Were all the intersections tied with Yes No cross ties or "figure 8" ties? x1 Comments: Note 1: In misc. shafts, explain here how the contractor provided the CSL access tubes extension for testing:
52
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