220Scaling Rock Cuts

Scaling Rock Cuts

220.1DESCRIPTION

1 This section describes the requirements for the removal and disposal of unstable rocks from cut slopes.

220.2MATERIALS—V acant

220.3EQUIPMENT

1 Scaling (machine) consists of dragging a scaling apparatus suspended from a crane over a slope to remove loose rock, soil, and debris . Provide a scaling apparatus consisting of a series of cleated dozer tracks, blasting mats, or similar equipment. Provide a crane with sufficient reach and lifting capacity to drag the scaling apparatus up and down the slope. If the equipment and methods do not produce the desired results, propose and test changes until results are satisfactory.

220.4CONSTRUCTION

1 Fifteen working days prior to commencing scaling, provide the engineer and the Geology Program the following:

or higher Technician through the Society of Professional Rope Access Technicians

Climbing Instructors Association (PCI A) or document (provide resume) that they have acquired the equivalent knowledge, skills, and abilities required for certification through SPRAT or the PCIA by working on rock slopes.

Technician by SPRAT or Level 1 or higher Slope Access Technician through the PCIA, or document (provide resume) that they have acquired the equivalent knowledge, skills, and abilities required for certification through SPRAT or the PCIA by working on rock slopes

3.1The proposed construction sequence and schedule,

3.2A list of the equipment and tools the contractor will use for each slope,

3.3The number of scaling crews.

Scaling Rock Cuts SECTION 220

3.4A rock removal and disposal plan for rock and debris generated from the

rock slope scaling work.

Do not begin work until the appropriate submittals have been reviewed by the engineer and the Geology Program.

2 Before starting, install a temporary rockfall barrier in the portion of the cut to be scaled. Scale within the limits of the rockfall barrier. Do not allow traffic to pass through the work zone while scaling . Protect the pavement with blast mats or other protective systems. Repair damaged pavement at no additional cost to the department. Clear the roadway and ditches of rock, and load, haul, and dispose of rock debris to a specified location.

3 Manually scale unstable rock that cannot be removed by machine.

4 During manual scaling, provide a crew on the slope that consists at all times of a working foreman and two scalers. Immediately replace with a foreman or scaler any crew member who leaves. Light mechanical means, such as hydraulic jacks or splitters, may be used to remove unstable rock that cannot be removed by conventional manual methods.

5 Following completion of scaling operations of a slope, the engineer will inspect the slope and determine if scaling is complete. If additional rocks are identified as being hazardous, continue to scale the slope until the scaling has been completed to the satisfaction of the engineer.

220.5MEASUREMENT and PAYMENT

1 The engineer will measure:

two scalers clipped into ropes and on the slope. Standby time while the road is cleared of debris and traffic passing through the work zone will be at the manual scaling rate. If there are more than two scalers on the slope, the CRWH will be prorated based on the number of scalers over the standard crew.

2 Setup or breakdown time of personnel and equipment for either scaling pay item will not be measured directly for payment. Hand (manual) scaling from a man lift or another piece of equipment will be paid for as Scaling (Manual).

3 Temporary rockfall barrier will not be measured or paid for separately, but will be considered subsidiary to the scaling bid items.

Scaling Rock Cuts SECTION 220

4 The department will pay as follows:

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest Scaling (Machine) HR 0.5 h 0.5 HR Scaling (Manual) CRWH 0.5 h 0.5 CRWH

220.5.1 Reference Sections for Direct Payment

1 When specified, the engineer will measure and pay for:

in accordance with Section, 203 Excavation and Embankment.