Hydraulic Updates. History of 603/604

Transcription

1 Ohio Department of Transportation John R. Kasich, Governor Jerry Wray, Director Hydraulic Updates SS 802 Constructing and Inspecting Pipe Culverts, Sewers, Drains and Drainage Structures AND SS 902 Conduit Inspection Equipment Ron Trivisonno Division of Construction History of 603/604 Item 603 first showed up in ODOT standard specifications in the = 569 pages 1965 = 471 pages 2010 = 883pages say 6 pages/year 2 1

2 Method vs. Performance Based Specifications In a method specification framework, work is performed in a prescribed way, with maximum control in the hands of the agency. The contractor follows a step-by-step script, provides materials, labor and equipment. Many method specifications as written, struggle with work that is outside the bounds of "reasonable close conformance." 3 Method vs. Performance Based Specifications A performance specification states requirements in terms of the required results. They include criteria for verifying compliance without stating the methods for achieving the required results. Written requirement that describes the functional performance criteria required for a particular equipment, material, or product. 4 2

3 Method vs. Performance Based Specifications Incentive for quality, technology investments Is it about Contractor compliance? Or about product performance? Communicate the design intent and translate the Department s intentions into clear, biddable instructions for the Contractor. Many public agencies have seen a dramatic decrease in the numbers and experience levels of inspectors and engineers in their workforce. 5 AASHTO Specification Foundation LRFD Bridge Construction Specifications Section 26 Metal Culverts Section 27 Concrete Culverts Section 30 Thermoplastic Pipe 6 3

4 Reinventing the Wheel? Similarities in 603 and 802 Anticipate 2013 C&MS Specification New Item Number How it works Contractor selects the drainage components allowed by contract. From an ever expanding list of materials. Contractor develops an installation plan appropriate for the materials selected. Contractor installs, monitors and documents the installation. Contractor provides 3 rd party inspection / evaluation and certification of Performance based on contract criteria. 8 4

5 802.01Description This work consists of constructing and reconstructing conduits and drainage structures. This work also includes preparing installation plans, performing inspections, and providing reports and other required documentation. 9 5

6 Materials Furnish pipe of the specified conduit type and size or one size larger. Furnish conduit of the specified material according to the plans If the material is not specified in the plans, furnish conduit conforming to any of the material requirements listed for that conduit type Type A, B, C, D, E and F very similar to Definitions Backfill Bed Bedding Material Conduit Corrugated Metal Conduit Cut Deflection Drainage Structures Fill Flexible Conduit Infiltration Lay Length Plastic Conduit Rigid Conduit Run of Conduit Spring Line 12 6

7 Submittals Shop Drawings Installation Plan Construction Inspection Forms Performance Report Submittals A. Shop Drawings Have a Registered Engineer prepare, sign, seal and date all calculations. Allow at least 28 days for the review. 14 7

8 Submittals B. Installation Plan Trench dimensions. Locate cut installation fill installation on the plan. Type of bedding and backfill material with lift thickness. Compaction density and equipment proposed for bedding and backfill. Identify the starting location for each run of conduit. Maximum allowable joint gap between conduit sections. Other installation details as necessary. Provide written confirmation from the conduit manufacturer that the pipe material and strength supplied are appropriate for the material and density requirements described in the installation plan for the backfill and bedding. This confirmation by the conduit manufacturer will not relieve the Contractor of the responsibility for obtaining the required results Submittals C. Construction Inspection Forms Perform work only in the presence of the Contractor s representative doing the inspection. Submit construction inspection forms to the Engineer for each run of conduit and each drainage structure. Form CA-P-1 for conduit Form CA-P-3 for drainage structures. I certify that the information on this form is accurate and all deviations from the current installation plan have been noted. 16 8

9 Submittals D. Performance Report Global Positioning System (GPS) location required Summary of all defects including type, measurement, and location Provide mandrel sizing calculations and documentation For remote inspections using a crawler mounted camera with laser profiler, include: Three dimensional model of the conduit based on the laser profile measurements. Digital profile of conduit extracted from the inspection video Calculations of the ovality, capacity and delta of the conduit Explanation as to why data was unattainable for any section of the conduit Submit a performance report to the Engineer within 5 days of completing the performance inspection Excavation Record any deviations from the installation plan on the construction inspection forms and revise the installation plan. Excavate trenches along the centerline of the conduit. When installing conduit in a fill situation, construct the embankment to the elevation of the spring line for the conduit or higher before excavating the trench. Provide a firm bed for the full width and length of the trench. If bedding material is not provided, loosen the middle third of the bed to seat the conduit. Provide a firm bed beneath the drainage structure. Remove any unsuitable material exposed in the bed for the width of the trench and a depth of at least 6 inches. 18 9

10 Footer Text Bedding and Backfill If using coarse aggregate material for bedding and backfill below the ground water elevation, wrap the coarse geotextile fabric. Shape the bedding with recesses to receive the bell of belland-spigot conduit. Loosen the bedding in the middle third to seat the conduit. LSM installations require min. 6 inch LSM cover over pipe. Ensure compaction density complies with the installation plan. Test compaction in accordance with Supplement If Structural Backfill Type 3 or open graded material is used, vibrate, tamp or compact to the compaction level required by the manufacturer in the installation plan

11 Laying Conduit Maintain flows and drainage or provide temporary diversion at no additional cost to the Department. Visually inspect all conduit in the presence of the Engineer before it is placed in the trench. Lay the conduit in the center of the trench at the invert elevation shown on the plans. Any deviation must be approved by the Engineer. If the Engineer does not approve the deviation, stop all related work until the conduit is re-laid Joining Conduit Visually inspect all conduit, joints, and gaskets in the presence of the Engineer before placing any backfill. Join conduit as recommended by the manufacturer Corrugated Metal Conduit Rigid Conduit Plastic Conduit 22 11

12 Exterior Coatings and Membrane Waterproofing Closely resembles 603 with regard to component materials. Installation methods need to be described in the installation plan. Performance Criteria Applies Drainage Structure Construction Maintain flows at all times until the new facilities are completed. Inspect all precast drainage structures in the presence of the Engineer Install all structures to the elevation, station, and offset shown on the plans. Align the manhole base with the pipe and its invert elevation per SCDs. Brick and Block Masonry - Pre-wet 48 hr cure Modular Precast Concrete All openings in precast drainage structures must be manufactured or cored. Reconstruction to grade Remove existing walls of catch basins and inlets below the window openings, grates, or any points of wall failure. Adjustment to grade install a casting or an acceptable adjusting device on file at the Laboratory or an adjusting device approved by the Engineer 24 12

13 Field Paving of New or Existing Conduit Field pave the bottom of the conduit with concrete as shown on the plans. Very similar to Performance Inspection Notify the Engineer at least five workdays before conducting a performance inspection. A performance inspection is not required for projects that meet all of the following: All conduit is Type C (Sewers not under pavement) Conduit plan quantities are less than 100 feet All conduit has less than 16 feet of maximum fill height 26 13

14 Performance Inspection Perform the inspection no sooner than 30 days and no later than 90 days after the completion of the finished grade when not below pavement and after the completion of the aggregate base when any portion of the conduit is below proposed pavement. If the contract duration will not permit a 30 day waiting period then the Engineer may adjust the waiting period. Furnish a video recording of each inspection Performance Inspection Ensure that the condition of the conduit will allow a thorough accurate inspection. Perform Manual Inspection on drainage structures

15 Manual Performance Inspection Non-circular conduits Conduits with a rise of 36 inches and greater Remote Performance Inspection Conduits with a rise less than 12 inches and Type D, E, and F conduits Conduits with a rise of 12 inches or greater up to 48 inches As directed by the Engineer. The Department will pay for this inspection according to Performance Inspection Manual Inspection Manual inspections require entering the conduit or drainage structure to record video and to make measurements - coordinate confined space access per OSHA requirements. Deflection Crack Width Joint Gaps Tape within ½ inch smallest inside diameter 3X per section of conduit 0.01 inch and greater length, and greatest width of each crack. Tape or ruler nearest ½ inch widest gap at each joint in the run 30 15

16 Performance Inspection Remote Inspection Use a crawler mounted camera to record video with the equipment described in Supplemental Specification 902. Remove all debris from the conduits being inspected according to Dewater the conduit if the water level hinders the performance of the equipment Conduit Evaluation Independent P.E. Have an independent Registered Engineer evaluate the conduit and any defects as required by AASHTO LRFD Bridge Construction Specifications (Section 26, 27 and 30) with modifications according to this specification. The independent Registered Engineer cannot be an employee of the Contractor or the conduit manufacturer

17 Conduit Evaluation When using a laser profiler, the conduit deflection must be calculated from the actual inside diameter at the measured location or calculated by inputting the largest diameter listed in the conduit quality control report. When using a mandrel, the mandrel must be sized according to the following equation: Mandrel size x (the diameter listed in conduit diameter report) Conduit Evaluation Certification Sign off I certify that repairs are not required for the conduit to function as designed and that the conduit meets the design life requirements described in the version of the Department s Location and Design Manual, Volume 2, Drainage Design, used in the original design. I certify that this repair plan was designed to ensure the repaired conduit will function as designed and will meet the requirements described in the version of the Department s Location and Design Manual, Volume 2, Drainage Design, used in the original design

18 Conduit Evaluation Metal Conduit Evaluate: If infiltration is observed. All racking, buckling or denting. Vertical alignment of conduit (Ensure there are no vertical sags in the conduit that trap water). Repair or replace conduit if the joint gap exceeds the tolerance (as described in the installation plan) for a length greater than or equal to 1/3 of the circumference. Repair all coating damage. Repair or replace conduit if deflection > 7.5% Conduit Evaluation Rigid Conduits Evaluate if infiltration is observed. Evaluate if joint gap exceeds the tolerance* for a length less than 1/3 of the circumference. Evaluate vertical alignment of conduit Ensure there are no vertical sags in the conduit that trap water. Repair or replace conduit if the joint gap exceeds the tolerance* for a length greater than or equal to 1/3 of the circumference. Repair or replace conduit if cracks > 0.10 inch. Repair or replace conduit if spalls or slabbing are observed

19 Drainage Structure Evaluation Drainage Structure Evaluation. Have an independent Registered Engineer evaluate the drainage structures and any defects listed in the table below. Certification of Engineer s finding repairs are not required meets the design life this repair plan was designed to ensure the repaired drainage structure will function as designed Drainage Structure Evaluation 38 19

20 Surface Settlements Repair any surface settlement within the trench limits or within 4 feet of a drainage structure. Have an independent Registered Engineer evaluate the conduit according to or the drainage structure according to Perform all repair work at no additional cost to the Department Method of Measurement Terms, conditions, assumptions very similar to 603/

21 Basis of Payment Payment for all inspections is included with the contract unit price of the corresponding pay item. All required repairs, including any settlement problems, must be made prior to acceptance. Department will not make additional payment for repair work on conduit installed under this specification Basis of Payment The Department will pay for accepted quantities at according to the following schedule: 60% After installation of conduit or drainage structure 10% After performance inspection is completed 30% After acceptance of the conduit or drainage structure 42 21

22 SS Crawler Mounted Camera Crawler Mounted Camera with Laser Profiler Mandrel 43 Proposal Note 802 Performance Based Conduit and Drainage Structure Installation Specifications 1/20/2012 Provide and install all Item 603 conduit and Item 604 drainage structures in accordance with Supplemental Specification 802. Construct and install all Item 604 monuments in accordance with C&MS 604. Designer Note: Include this Proposal Note on all projects with a construction cost estimate of $10,000,000 and above that are sold after March 31,

23 Questions