610GNSS CONSTRUCTION EQUIPMENT

610

6-37SECTION 610 – GNSS CONSTRUCTION EQUIPMENT

610.01DESCRIPTION . This work shall consist of using grading equipment controlled with a global

navigation satellite system (GNSS) machine control system in the construction of the roadway design and building the required surface models to facilitate GNSS machine control grading. This work shall also consist of furnishing, configuring, installing, maintaining, and removing GNSS units as needed for use by the Engineer and their inspection staff, including building the required surface models and loading them into the Contractor prov ided data collectors, and the training of the Engineer and their representatives on the use of the GNSS units provided.

610.02EQUIPMENT . The Contractor may use any type of GNSS machine control grading equipment

and systems which will generate end results meeting the Contract requirements. The Contractor shall supply GNSS construction inspection units for use by the Engineer. Each unit shall include all necessary components, communication devices, integrated antennae and receiver and cables, data collecto rs, operating manuals, attachments, and fastening hardware to meet the minimum requirements described below .

include, and be licensed to operate, the same version of GNSS planning software and data collection software to be used by the Engineer for data collection. Units shall be capable of tracking multiple constellations and allow for software updates within two years from the time of delivery. At the time of delivery of the GNSS units, all software provided (including firmware) shall be the most current available from the manufacturer and shall not be more than two years old. The Contractor shall provide a printed copy of the date of software installation for verification.

used by the Contractor) for use during the duration of the Contract. At the end of the Contract, the GNSS rover unit will be returned to the Contractor .

transfer between the GNSS units and the data collectors.

610 6-38 (e) GNSS units shall be equipped to receive, and be capable of using, real time kinematics (RTK) correctional data (current version of RTCM format) through internet protocol provided from the VT Continuously Operating Reference System (VT CORS) Network. Th is shall include all necessary communication devices, repeaters, and systems, data service plans, and communications to meet the minimum required accuracy and not exceed 2 second latency at the rover. Whichever communication method is used by the Contracto r to broadcast the VT CORS RTK correctional data, the Contractor shall ensure that the RTK data shall be available at all locations across the entire Contract site during all hours of construction and inspection operations.

receiving RTK correctional data to satisfy the requirement of using VT CORS RTK corrections.

0.033 feet + 1.0 ppm horizontally and 0.065 feet + 1.0 ppm vertically.

the GNSS units to an Agency -provided PC and communicate and exchange positional data with that Agency PC.

through all active working hours (may include interchangeable batteries ), including the battery charger.

bipod which is compatible with the rover rod, one bracket connecting the data collector to the rover rod, and one topo shoe.

hardware, fasteners, or accessories necessary to install it in a fixed semi -permanent location. This setup will not be considered as a rover unit and therefore will not require a rover rod, a bipod, a data collector bracket, or a topo shoe.

610 6-39 610.03 CONSTRUCTION REQUIREMENTS .

points in the field for the project as indicated in the Contract.

localized coordinate system. The control information used in establishing the localized coordinate system, specifically the rotation, scaling, and tra nslation, can be obtained from the Engineer upon request.

available the following electronic data files. The files that will be made available were originally created with the computer software applications MicroStation (CAD software) and InRoads or OpenRoads (civil engineering software). The data files will be in the native formats and other software formats as described below.

ii. InRoads or OpenRoads ALG files containing horizontal and vertical geometry. iii. MicroStation alignment design file. iv. MicroStation cross section design files.

vi. MicroStation existing ground topography design file.

ii. LandXML (ASCII format).

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6-40The Contractor is notified that the Agency uses the US survey foot as a basis for all

engineering work. Particular care shall be taken to ensure that the US survey foot is used in any conversion or evaluation of the files provided. This includes any required conversion from MicroStation DGN to AutoCAD DWG, or from InRoads or OpenRoads to other engineering formats. The XML files shall also be checked to ensure that the US survey foot is used. Information shown on the Plans governs over the provided electronic data. The electronic information shall not to be considered a representation of actual conditions to be encountered during construction. Providing the Contractor this information does not relieve the Contractor from the responsibility of making an investigation of conditions to be encounte red, including but not limited to site visits, and basing any bid on information obtained from these investigations and their professional interpretations and judgment. The Contractor assumes all risk of error if the information is used for any purposes for which the information was not intended. Any assumptions the Contractor makes from this electronic information are at their own risk.

results, surveying calcul ations, records, field procedures, and actual staking .

GNSS machine control grading and build the 3D model to do the same.

reconstruction of work, that may be incurred due to errors in the application of GNSS machine control grading techniques. Grade elevation errors and associated quantity adjustments resulting from the Contractor’s activities shall be corrected at no cost to the Agency.

with the machine control grading system.

610 6-41 e. The Contractor shall check the GNSS machine control system at the beginning of each work day and recalibrate if necessary.

conventional grading construction as required by the Standard Specifications.

at locations along the length of the project and outside the project limits or where work is performed beyond the project limits as required at intervals not to exceed 1,000 feet. The horizontal position of these points shall be determined using static GNSS sessions or by traverse connection from the original baseline control points. The ele vation of these control points shall be established using differential leveling from the project benchmarks, forming closed loops. A copy of all new control point information shall be provided to the Engineer prior to construction activities. The Contract or is responsible for all errors resulting from their efforts and shall correct all deficiencies to the satisfaction of the Engineer at no additional cost to the Agency.

project limits shall be preserved. Reference points that have not been preserved shall be reestablished at no additional cost to the Agency.

on the crosss ection at 1,000 foot intervals on mainline and at least two cross sections on the side roads and ramps. These hubs shall be established using conventional survey methods for use by the Engineer to check the accuracy of the construction.

locations such as, but not limited to, PCs, PTs, superelevation points, and other critical points required for the construction of drainage and roadway structures.

submit to the Engineer for review a written machine control grading work plan which includes the equipment type, control software manufacture and version, and the proposed location of the local GNSS ba se station used for broadcasting differential correction data to rover units.

610 6-42 (b) GNSS Construction Inspection Equipment .

provide the Engineer and their representatives with training on the operation of the GNSS units. The Contractor shall ensure all GNSS units are fully operational and training has been provided before construction begins. The Contractor shall maintain all GNSS units and software in good working condition and shall provide replacement due to breakdown, damage, or theft within 2 working days. The Contractor shall retain ownership of all supplied GNSS units at the end of the Contract.

corrections are derived. The Contractor shall choose which communication technique and devices will be used which will ensure the consistent and reliable delivery of RTK correctional data from VT CORS to the GNSS units. When geographic locations or lack of a reliable communications network prohibit the use of the VT CORS directly, the Engineer may approve the use of a survey grade GNSS inspection unit as a base station in place of

the VT CORS, which will be paid for separately through a change order.

location where it shall not be disturbed by construction activities nor be easily damaged by

vandalism, and where it will be capable of providing radio signal coverage over the entire

Contract area. If the base station cannot broadcast a signal that covers the entire site, the

Contractor shall provide adequate repeater radios or other communications at such

frequency and locations such that a minimum of 90% signal strength is maintained

throughout the project site. A GNSS unit installed as a base station for inspection

operations shall only be moved with the approval of the Engineer.

provided with a minimum of 16 hours of training on the use and operation of the GNSS

equipment and software. Initial training shall occur within one week of delivery of GNSS

units to the site unless otherwise directed by the Engineer. The remainder of the training

hours shall occur at the request of the Engineer. If a Contract has multiple years of work,

an additional 8 hours of training shall be provided every additional year at the request of

the Engineer.

All training shall be performed by a manufacturer-verified trainer who is approved by the

Engineer. The training shall occur at the Engineer’s field office or at a location agreed to

by the Engineer.

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week after the Engineer requests its removal in writing, or the Agency relinquishes the

Engineer’s field office.

the data provided by the Agency as described in Subsection 610.03(a)(1)c. The Contractor

shall load the models onto the provided data collectors to facilitate construction inspection

by the Engineer.

provided by the Contractor.

610.04METHOD OF MEASUREMENT. The quantity of GNSS Machine Control Grading to be

measured for payment will be on a lump sum basis in the complete and accepted work.

The quantity of GNSS Construction Inspection Equipment to be measured for payment will be the number

of each GNSS Construction Inspection Unit provided and operational in the complete and accepted work.

The quantity of GNSS Construction Inspection Surface Models to be measured for payment will be for

all required GNSS Construction Inspection Surface Models on a lump sum basis in the complete and

accepted work.

610.05BASIS OF PAYMENT. The accepted quantity of GNSS Machine Control Grading will be paid

for at the Contract lump sum price. Payment will be full compensation for furnishing all labor, equipment,

and material necessary in preparing the electronic data files for use in the Contractor’s machine control

system, the required system check and needed recalibration, training of the Contractor’s staff, machine

control equipment, maintenance, and for furnishing all materials, labor, tools, equipment, and incidentals

necessary to complete the work.

The accepted quantity of GNSS Construction Inspection Equipment will be paid for at the Contract unit

price per each. Payment will be full compensation for furnishing all equipment, support, training for the

Engineer, maintenance, and for furnishing all materials, labor, tools, equipment, and incidentals necessary

to complete the work.

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The accepted quantity of GNSS Construction Inspection Surface Models will be paid for at the Contract

lump sum price. Payment will be full compensation for furnishing the required surface models, performing

corrections and updates to the models if issues are discovered, and for furnishing all materials, labor, tools,

equipment, and incidentals necessary to complete the work.

Delays due to satellite reception of signals to operate the GNSS machine control system or inspection

equipment will not result in adjustment to the Contract unit price for any Contract items or be justification

for granting Contract time extensions.

biweekly estimate as determined by the Engineer pending progress on other Contract items.

estimate following the completion of 50% of the Contract.

been delivered to the Engineer and is fully operational.

following the completion of 50% of the Contract.

delivered to the Engineer and installed on the equipment.

following the completion of 50% of the Contract.

Payment will be made under:

Pay Item Pay Unit

610.1000 GNSS Machine Control Grading ..............................................................Lump Sum

610.2000 GNSS Construction Inspection Equipment ..............................................Each

610.2500 GNSS Construction Inspection Surface Models .......................................Lump Sum

613

6-45SECTIO N 613 – STON E FILL AND RIPRAP

613.0 1 DESCRIPTION . This work shall consist of furnishing and placing protective materials. 613.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Sand Borrow and Cushion ................................ ................................ ......................... 703.03 Stone for Riprap, Heavy Type ................................ ................................ ................... 706.03(a) Stone for Riprap, Light Type ................................ ................................ ..................... 706.03(b) Stone Fill, Type I ................................ ................................ ................................ .......706.04(a) Stone Fill, Type II ................................ ................................ ................................ ......706.04(b) Stone Fill, Type III ................................ ................................ ................................ .....706.04(c) Stone Fill, Type IV ................................ ................................ ................................ ....706.04(d) E-Stone Fill, Type I ................................ ................................ ................................ ....706.05(a) E-Stone Fill, Type II ................................ ................................ ................................ ..706.05(b) E-Stone Fill, Type III ................................ ................................ ................................ .706.05(c) E-Stone Fill, Type IV ................................ ................................ ................................ .706.05(d) E-Stone fill shall be of the type specified on the Plans, supplemented with material excavated from the channel or the tailings of a topsoil screening operation. Bed material shall be approved by the Engineer and the Vermont Agency of Natural Resources prior to use . Similar sized river sediment is an acceptable alternative as is a mixture of angular material and river sediment. 613.0 3 PREPARATION . The areas to be protected shall be constructed and graded to the lines shown on the Plans or as directed by the Engineer and, if a fill area, shall be compacted . All slopes shall be maintained to the neat lines shown on the Plans prior to the placing of filter or bedding material , stone fill, or riprap. 613.0 4 PLACING .

manner that will result in a reasonably well graded surface. Care shall be taken in the placing to avoid displacin g the underlying material . Stone fill placed inside of a closed structure shall be placed such that the structure is not damaged. The stones shall be so placed and distributed that there will be no segregation of either the larger or smaller sizes of stone .