Drilled Shaft Log Instructions

Drilled Shaft Log Instructions The custom made list you create with the soil descriptions will be available in worksheet “DS Log Pg 2” and the optional “Opt. DS Log Pg 3” and “Opt. DS Log Pg 4”. At each of these pages you can see the table below the bottom of your worksheet as shown in the figure below. In these pages you can either keep the same soil description list of the first page or do changes if you needed for the particular page you are in. The first cell of the list in page 2 (and the optional 3 and 4) is protected. The grey shaded ones you can change. The first cell is kept protected to help you restore the equation in case you made an unintended change in the descriptions underneath. III. SHAFT INSPECTION DEVICE This form is not typically required on drilled shafts for miscellaneous structures. It is required in bridges when included on the plans. Therefore, when required it will be used on the workbook form 700-010-85 (Drilled shaft form for Bridges). The figure below illustrates the SID sheet. Use the SID worksheet to document the details of the shaft inspection device. The camera has to be placed on a minimum of five locations as indicated in the log. Large diameter shafts may require additional points. Discuss with the PA regarding the number of points required. At each camera location observe and record the largest thickness of the sediments. If the sediment at one location already exceeds 1.5”, the shaft cannot be approved for pouring and the contractor must perform additional cleaning. At each camera location observe and estimate the percentage of the view area that has less than ½ inch sediments. After all the locations have been observed and recorded determine the average percentage of the shaft with less than ½ inch of sediments. This is done simply by performing an arithmetic average of the individual locations. If the average of the five (or more) readings is less than 50%, the shaft is not acceptable for pouring and the contractor needs to perform additional cleaning. Note: Inspectors can refer to FDOT Soils and Foundation Handbook, section 10.6, for information on this device and inspection procedures. Below is an excerpt of this section that illustrates how the inspection is done: “.The Shaft Inspection Device uses pressurized nitrogen to overcome the static head of the drilling fluids, purge the fluids from the camera bell, and provide an unobstructed view of the shaft. A small reduction in air pressure would allow drilling fluid to slowly enter the bell. When the shaft bottom is flat (as required in Specifications) and the bell is plumb, a layer of water or drilling fluid in the bell can be used measure the thickness of sediments mounds "away" from the 6

Drilled Shaft Log Instructions sediment depth gauge. When the fluid rises to the 1/2" pin on the gauge, the percentage of the view covered with sediment deposits thicker than 1/2" may be estimated; these sediments are above the fluid level. When the 1/2" depth pin is missing the first mark (1.0 cm) depth must be used. The same procedure may also be used to determine whether any portion of the view contains sediments in excess of 1-1/2" [4.0 cm] thick. Special care must be used to ensure the fluid does not erode the sediment as it enters the bell, especially if the operator attempts to fill the bell with water using the water jets intended for flushing these sediments, instead of filling the bell with drilling fluid as described above.” IV. DRILLED SHAFT FLUID/SLURRY TESTING LOG As part of the drilled shaft log set (form 700-010-84 and 700-010-85), there is a form to be filled by the technician performing the fluid or slurry tests. Testing is performed at two instances: For mineral slurries prior to introduce to the shaft (premix) and just prior to place concrete. For polymer slurries testing must be performed after it is introduced in the shaft (and before the excavation proceeds below the casing) and just prior to placing concrete. This form is used to document these cases. Gray shaded cells in the form indicates data that can be input by the inspector. The form is pretty straight forward and the figure above illustrates the data that needs to be input. V. REINFORCEMENT AND SPACERS LOG As indicted before the inspector must compete the checklist of Page 2 of the Drilled Shaft Log (section 12). In addition, the inspector is required to complete the detailed Reinforcement/Spacers/Log worksheet to document the CSL access tubes, spacers used, reinforcement diameters and length and extensions used. In this form the inspector inspects and documents the reinforcement, CSL tubes and spacers observed. See figure below. The heading section information comes from Page 1 of the workbook and it is already transferred (white cells) or available through drop down boxes in the grey cells, except for the dates. 7

Drilled Shaft Log Instructions Section 17: In this section input the number of CSL tubes, diameter of CSL tubes, the total length of the tubes including the extra length above the shaft, and the extra length that was provided. The net length below the top of the shaft will be computed later on in section 20 as the total length minus the extension. Section 18: In this section input the distances in feet between row spacers. See sketch. Section 19: In this section input number of spacers per row number of rows and the details of the reinforcement cage. If there are more diameters and details that cannot be covered by the form, please use the “Addl. Concr. and Reinf. Comments” form. We will discuss later the optional forms that are typically hidden. Note: If desired, user can use the optional Est Steel Vol sheet to assist in the input of required number of vertical bars and tie bars. This Est Vol sheet is not available for bridge shafts. Section 20: This section has been deleted from this form and an optional page named “Tubes grouting” has been created instead. This new page/section is used to document the grouting of the CSL/Thermal Integrity Testing tubes. See Optional Worksheets section below. 8

Drilled Shaft Log Instructions VI. OPTIONAL WORKSHEETS There are hidden worksheets in the workbook that can be accessed if required. To access the hidden worksheets, right click at one of the tabs at the bottom. A menu will appear which include the options of Hide and Unhide. Choose Unhide to show the list of hidden sheets. See left figure. The list of available hidden sheets will show up (see figure below). Select from this list the sheet you want to unhide. The additional/optional pages are: Opt. DS Log Pages (for excavation) Fluid Slurry (if additional pages needed to document slurry testing) Concrete Pages Additional Exc. Comments (for additional comments related to the excavation, slurry and casing installation) Additional Concrete and Reinforcement Comments (for additional comments related to reinforcement and concrete) Attachment (to attach pictures or any important attachment if desired). Est Steel Vol worksheet Tubes Grouting, to document the grouting of the CSL or Thermal Integrity Testing tubes. Note: the “additional Exc. Comments” spreadsheet is also used to document the experience of a trainee looking for CTQP qualification. 9

Drilled Shaft Log Instructions As mentioned above, the optional Est Steel Vol worksheet can be used by the user when recording the steel details. To use this Est Steel Vol tool, first click on the “Select Type of Structure” block (where “MA Signal” is currently selected and displayed in the above example), click on drop-down box to open the list and select the Type of Structure from the list that matches the current drilled shaft installation. The table format will then automatically reflect the FDOT Design Standard table format that applies to the selected “Type of Structure” drilled shaft (ex. in this case, tailored for a MA Signal drilled shaft). The table input variables format will automatically be revised/tailored to accommodate user input of applicable plans/design data (grey blocks with bold black borders, DA through FF in this example). Input plans/design data for the particular drilled shaft (ex. corresponding numbers DA 12 through FF 6 in this example). Once the table data is input, the Estimated Steel Vol (CY) is calculated (ex. see red font 0.115 CY total, in above example), and the total minimum number (quantity) of Tie Bars required by plans/design is calculated and displayed (ex. 23). This plans/design based calculated number of Tie Bars can then be compared to the number determined during actual inspection, once the inspection data is input on the Drilled Shaft Reinforcement/Spacers/Log sheet (ex. in the above example, inspection verified 24 Tie Bars). 10

Drilled Shaft Log Instructions The “CSL or Thermal Integrity Access Tubes Grouting Log” sheet is used to document the grouting of the CSL tubes (See Figure below). There are dropdown boxes that may assist in the input of the heading fields, in case information previously input during the construction of the shaft still applies; otherwise manual input should be performed. The Total grouting Theoretical volume is computed based on the number and the length of the tubes below the top of the shaft and the diameter of the tubes. Because grouting of the tubes will occur after the Engineer accepts the shafts and after testing, or after deciding not to test, grouting of the tubes will occur many days after finishing the shaft. Therefore the drilled shaft inspector involved during the shaft construction may not be the person verifying the grouting. The worksheet is hidden but available for the CEI or the entity required to inspect the grouting of the tubes. 11

Drilled Shaft Log Instructions VII. CONCRETE PLACEMENT SPREADSHEETS The concrete placement of the drilled shaft is documented on the concrete placement and concrete curve spreadsheets. In the figure below a Drilled Shaft Concrete Placement Log form is illustrated. In this form the inspector will record the concrete truck information, rejections, times, depth measurements, elevations, theoretical volumes, actual volumes, volumes used but not placed into the shaft and any event related to the concrete process. The slide shows the spreadsheet, which will cover up to 10 truckloads. For the majority of the projects one page should be enough to cover the concrete operation. In any case, the workbook contains up to 3 pages, so we can cover pretty extreme lengths of shafts in FDOT projects. There is an additional sheet to plot the concrete volume curve. There is also additional concrete and reinforcement comments sheet available. Remember that the additional/optional sheets can be accessed by using the “unhide” command the pages as we explained previously. All the concrete volumes to be entered in this form will be in cubic yards. Let us divide the form in 4 sections as illustrated in the figure above. Section 21: Section 21 contains the Project Name, Project number, Contractor’s name, etc. Most of the information in section 21 will come automatically from Spreadsheet 1 of the workbook. In the grey cells inspector information from previous activities is available through the dropdown boxes. If there is no 12

Drilled Shaft Log Instructions change of inspector you can just click that information from the dropdown boxes. Make sure to input the correct date of concreting. Section 22: This area of the log contains the Placement Methods, Volume in Lines (VL), REF Elev., etc. Fill in as much information as possible in the grey cells prior to the concrete placement. When concrete is pumped, fill in the Pump Lines: diameters (ID) in inches and Lengths in feet, for the pipe(s) used. Compute the Volume in Lines (VL) in the spaces provided. The Excel spreadsheet provides input cells for up to 2 Pump Line configurations. The Volume in Lines (VL) deduction is calculated by input of pump line ID in inches and the Length in feet. Indicate the correct concrete Method of Placement (Tremie or Pump). You can input an “X” or use dropdown to select and apply the “X”. If concrete is pumped, it’s important to apply the “X” as it interacts with some sheet calculations. When a Tremie is used indicate the inside diameter ID in inches and Length in feet of the Tremie pipe used. In this length do not include the length of the hopper. Enter only the tremie length below the hopper. The Tremie must be long enough to be able to be seated firmly on the shaft bottom. When concrete is pumped, fill in the Pump Lines: diameters (ID) in inches and Lengths in feet, for the pipe(s) used. At the right side of this section there are two cells to input the “beauty ring” information (surface form): diameter and length. This is not to be confused with the casing information to be input in section 24. The Surface Form (commonly referred to as the “Beauty Ring”) “ID” input is currently not used within the “Concr. Curve” sheet’s calcs. Section 23: This section is used to fill the truck load information. As each truck arrives and pours, the load and times must be recorded, along with the depths. Be consistent with the times. It could be military (00 to 24 hrs.) or standard clock (0-12). In this case remember to enter the AM or PM after the hour. For every truck load input the following: Truck number. Batch times. Check the delivery ticket. Note: make sure to use the appropriate time format or the input will not be allowed (e.g.: 10:00 AM, 10:15 PM). Placement Start Time and Finish Times. On the Start Time column the cells include a drop-down box to be used when the truck is rejected or not used. Tremie Depth after finishing each truck placement. Make sure the tremie pipe has been marked properly to facilitate inspection monitoring of the tremie depth during placement. During the placement, it is important to check the depth of the tremie and concrete to ensure the bottom of the tremie stays submerged into the concrete. Depth to Concrete, after finishing each truck placement. Volume Delivered VD Volume Left in Pump Hopper (LPH) (estimated). There are two columns one for left in hopper for the truck before the one we are currently recording and one for amount left in hopper after we finish pouring the current truck. These are only used in the pumping method. We will talk more about these two columns later. Volume used for (QC) Testing (estimated). Volume Left in Truck (it is very likely that the last truck will not use the full load). Volume Left on Ground (Spillage) (estimated). 13

Drilled Shaft Log Instructions Volume used to prime the lines. Volume in the lines. Apply the previously computed total Volume in Lines (VL) by inputting the volume into the VL block of the applicable truck load placement, usually the first accepted truck load only. Volume placed is defined as the volume of concrete that goes actually into the hole. In general the Volume placed is equal to the Volume delivered VD in each truck minus the wastage VW and minus the volume in the lines VL. In the tremie method there will be no volume in the lines. In the pump method VW will be the combination of several components: Volume in hopper after and before each truck is poured, testing, volume left in the ground and volume in lines. LPH (left in Pump hopper) columns: Before the concrete of a particular truck is pumped, there will be some amount left in the pump hopper from the previous truck (LPH before truck placement). Check before and after every truck placement and estimate and record the volume which is Left in the Pump Hopper at a particular truck. For example in this figure for the first truck, after the concrete was placed, there was 0.30 CY in the hopper. Input this amount under LPH. After truck placement and also under LPH Before truck placement for the second truck. Note that for the first truck, we expect the hopper to start clean because the hopper does not have any concrete from previous trucks, and therefore the expected LPH volume “before the first truck placement” is zero. For the second truck the inspector estimated 0.20 CY after the second truck was placed. The inspector has input 0.2 in the LPH “After Truck Placement” in the second truck and also for the third truck “Before Truck Placement”. For the third truck the inspector estimated 0.4 CY left after placement. He has input 0.4 CY LPH (after) for this third truck and also as LPH for the next truck (fourth truck). The process will continue until the last truck. The form uses the following equations to compute the place volume of concrete VP: VP VD – VW – VL VD Volume Delivered VW Wastage Volume VL Volume in the lines. Applied only in the first accepted truck. VP VD- [(LPHafter - LPHbefore) Testing Left in Truck Left on Ground Prime Lines] - VL VW (LPHafter - LPHbefore) Testing Left in Truck Left on Ground Prime Lines For example, for the 1st truck below, VW (0.30- 0.00) 0.10 0.00 0.50 0.9 CY VL 2.00 CY VP 10.00 – 0.9 – 2.00 7.10 CY For the tremie placement the input is simpler. There are no Volume in lines and the wastage only consists of the amount spent in testing, amount left in the truck and the amount left on the ground. In this case the equations used by the form are: VP VD – VW VW Testing Left in Truck Left on Ground 14

Drilled Shaft Log Instructions VP VD – [Testing Left in Truck Left on Ground] Section 24: This part of the form contains the total volumes as well as additional casing placement and removal information. Total Volumes-Pump: The figure below illustrates how the total volumes are calculated at the end of the pour. Individual waste volumes are summated at the bottom of each column. For example, for testing the total was 0.2 which is the result of 0.1 plus 0.1. In this example, the volume left in the hopper after the last truck is waste because it will not be used at all, and should be added to the other waste totals. Note that LPH after last truck placement is equal to the total LPH after minus the total LPH before, which in this case it would be 1.7 – 1.4 0.3 cubic yards. In this example, with just 1 concrete page used ( 10 truckloads), Concr. Pg 1, the workbook Totals are equal to the sheet totals. For example, the light grey font 1.40 and 1.70 are totals for this sheet only. However, if Concr. Pg 2 was also used to record additional placement ( 10 truckloads), the black font workbook Totals 1.4 and 1.70 would be different from the current Concr. Pg 1 sheet values. For Misc drilled shafts, using more than 1 Concr. Pg is unlikely. The total wastage for this example would be 0.3 plus 0.2 plus 3 plus 0.2 plus 0.5 equals to

DRILLED SHAFT WORKBOOK - FORMS 700-010-84 AND 700-010-85 (December 2017) The Drilled Shaft Log set is used to record the construction observed during the drilled shaft construction process. The different stages of construction will be documented on individual worksheets linked together to create a workbook. Therefore, every drilled shaft will .