ODOT_059-24_Specifications__GSI_completed_.pdf

Invitation No.: 059-24 Location: All Districts

Commodity: Geohazard Maintenance Multiple Award

Vendor: GeoStabilization International

GeoStabilization International meets all experience requirements defined in the project specifications. A statement of qualifications can be provided upon request.

As requested in the invitation to bid, the following provided applicable Technical Specifications for Steel Tube, Steel Bar, & Plate Piles including Design lengths and standard spacing. Also as requested, additional items required to support a landslide repair project with the above technologies (e.g., reinforced shotcrete, proof tests, etc.) were also added herein.

Launched Soil Nails™ (Steel Tube) In addition to the material specs outlined in the invitation to bid the contractor must:

Insert launched nails with a single stroke at a chamber pressure between 750 and 3000 psi.

Inserted length and spacing will be determined based upon the engineering plans submitted by the Contractor for the area. Typical spacing is 3-ft to 4-ft in both directions Do not leave more than eight (8) feet of a launched soil nail exposed after launching unless approved by ODOT.

Cut off the exposed portion of installed nails for inclusion into shotcrete or flush to ground in the case of no shotcrete work when not required by plans.

Dispose of the cut-off portions of the launched soil nails off the right of way at sites obtained by the Contractor at no additional cost to ODOT.

Do not reuse remaining lengths from cut nails for launched soil nails.

Drilled Soil Nails (Steel Bar) In addition to the material specs outlined in the invitation to bid the contractor shall furnish:

Anchor bar shall be continuous without splices or welds, new, straight, and undamaged.

Only anchors greater than 20 feet in length may be spliced using a mechanical coupler. Bar couplers, if used, shall develop the full ultimate tensile strength of the bar as certified by the Manufacturer.

Length and spacing will be determined based upon the engineering plans submitted by the Contractor for the area. Typical spacing is 3-ft to 4-ft in both directions.

Self-Drilling Soil Nails (Steel Bar)

Anchor bar shall be hollow, threaded bar, new, straight, and undamaged with a sacrificial drill bit.

Multiple bars may be coupled to produce the final length. Bar couplers, if used, shall develop the full ultimate tensile strength of the bar as certified by the Manufacturer.

Bar thread pattern should be continuous and conform to the pullout requirements of ASTM A 615

(Williams Form Engineering “B7X” or approved equivalent).

Bar outer diameters shall be a minimum of 1.5 inches and up to 3 inches depending on design load.

Length and spacing will be determined based upon the engineering plans submitted by the

Contractor for the area. Typical spacing is 3-ft to 4-ft in both directions.

Grout for Nails

Neat Cement Grout following ACI specifications.

The following grout mix design proportions:

Grout Mix Design - Water/Cement Ratio = 0.5 to 0.6

Batch Weight Per Cubic Yard Material Weight Volume Bags/Gallons

Cement 2063.0 <-> 1837.0 lbs 10.4 <-> 9.3 cf 22 <-> 20 Bags Water 1031.5 <-> 1102.2 lbs 16.5 <-> 17.7 cf 124 <-> 133 Gallons

Total 3094.5 <-> 2939.2 lbs 27 <-> 27 cf

Per 94# Bag of Cement Material Weight Volume Bags/Gallons

Cement 94 lbs 0.5 cf 1 Bags Water 47.0 <-> 56.4 lbs 0.8 <-> 0.9 cf 5.7 <-> 6.8 Gallons

Total 141 <-> 150 lbs 1.2 <-> 0.9 cf

Incidental Facing, Drains, & Shoulder Build-out Items To stabilize slides additional facing items are required in combination with the soil nails specified in the invitation to bid. Per Section 6 of the invitation to bid, specifications and pricing for shotcrete facing as well as other commonly used facing types for stabilizing slides have been provided below in the event these are required. Also, per Section 6, specifications and pricing for grout that may be required to fill voids has been provided.

Wire Mesh Surface Treatment Specification

This work shall consist of furnishing and installing high strength single twist wire mesh to prevent shallow plane failures around a soil nail array.

Mesh Type: High strength single twist rock fall mesh Wire diameter: 0.118 inches or greater Wire Strength: 75 ksi or greater Wire Coating: Minimum of 0.8 ounces/square foot (as determined by ASTM A-90) Zinc/Aluminum Alloy (as per ASTM B750-09). Plain hot-dip galvanized is not acceptable.

Mesh Opening Size: 2.56 inches or smaller (using maximum circle method), area of opening shall not be less than 8.2 square inches

Measure of Payment (SF) ODOT will measure wire mesh surface treatment in square feet. Payment at the contract unit price per square foot shall be full compensation for the materials, labor, and equipment necessary for the placement of the wire mesh surface treatment.

Shotcrete Surface Treatment Specification

Contractor must furnish shotcrete complying with the requirements of ACI 506.2, “Specifications for Materials, Proportioning and Application of Shotcrete”, except as otherwise specified in Ohio Building Code Section 1913 – “Shotcrete”.

Measure of Payment (SF) ODOT will measure shotcrete in square feet based on 6, 8, and 12-inch section thickness. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price per square feet. ODOT will not make payment for partial deliveries. ODOT will not make payment for materials on site and not installed. Payment at the contract unit price per square foot shall be full compensation for all labor, materials, equipment, drains, reinforcing steel, shotcrete, and all incidentals to furnish and place shotcrete around the soil nails, including but not limited to any preparatory trimming and cleaning of soil/rock surfaces for receiving new shotcrete.

Sheet Pile Facing Specification

Contractor must furnish and install Skyline Steel PZ-27 or equivalent sheet piles up to 30-ft in length.

Measure of Payment (SF)

ODOT will measure sheet piles in square feet installed measured from top of sheet to buried tip of sheet times the length of wall. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price per square feet. ODOT will not make payment for partial deliveries. ODOT will not make payment for materials on site and not installed. Payment at the contract unit price per square foot shall be full compensation for all labor, materials, equipment, and all incidentals to furnish and place sheet piles.

Horizontal Drains Specification

Horizontal drains consist of 1.5-inch diameter (or larger) slotted schedule 80 (or thicker) polyvinyl chloride (PVC) plastic pipe conforming to the requirements of ASTM Designation: D 1785. These pipes are inserted into drilled holes to reduce water pressures within slide masses.

Pipe Slots/Perforations: Slotted pipe shall have two (2) rows of slots. The rows shall be in the longitudinal direction of the pipe and the slots shall be cut in the circumferential direction of the pipe. The rows shall be centered on two (2) of the third points (120 degrees apart) of the pipe circumference. Each row of slots shall conform to one of the following configurations. Slots shall be spaced uniformly along the pipe. The minimum opening will be measured on the inner surface of the pipe.

Perforated pipe shall have three (3) rows of perforations with one row on each side of the pipe and the third row in the top. The perforations shall be 10 mm in diameter spaced at 75-mm centers with the top perforations staggered in relation with the holes on either side. Fittings for the PVC plastic pipe shall be Schedule 80 Type II PVC solvent weld type fittings conforming to the requirements in ASTM Designation: D 2467. Machined male and female ends may be used in lieu of couplings. Unslotted or unperforated PVC plastic pipe, between 1 m to 9 m in length, shall be provided at the outlet of the drain.

Measure of Payment (LF) ODOT will measure horizontal drains in linear feet. Upon receipt of proper invoices, ODOT will pay for the materials delivered and accepted at the Contractor’s unit price per linear feet per site as required. ODOT will not make payment for partial deliveries. Payment at the contract unit price for each unit shall be full compensation for all materials.

GCS Wall Construction (Up to 8ft deep) Specification

Geosynthetically Confined Soils (GCS) wall may be used in conjunction with Soil Nails and/or Shotcrete to create a wider platform or to construct a small box or abutment wall. This wall shall consist of a standard, split faced concrete masonry unit, roadbase backfill, and a woven polypropylene geosynthetic fabric placed between each block. The geotextile shall have a minimum wide strip tensile capacity of 2400 pounds per foot. Final design of the GCS feature will be determined in the field.

GCS wall will be constructed to lines and grades determined by the Engineer. CMU blocks shall meet or exceed the requirements of ASTM C-90 and have a minimum net compressive strength of 1900 psi. The block shall be new, sound, and free of cracks and other defects.

Measure of Payment (SF) ODOT will measure the GCS Wall in square feet. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price per square feet. ODOT will not make payment for partial deliveries. ODOT will not make payment for materials on site and not installed.

Payment at the contract unit price per square foot shall be full compensation for all labor, materials, equipment, and all incidentals to install the GCS Wall (excluding granular backfill material).

GCS Wall Backfill Specification

When requested the contractor shall provide backfill material for the GCS wall. The backfill shall be crushed aggregate road base with maximum particle size of 2” and with a Plastic Index (PI) below 6, or #57 limestone. Compaction should be 95% of AASHTO T-180.

Measure of Payment (TON) ODOT will measure GCS Wall Backfill in Tons Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price per ton. ODOT will not make payment for partial deliveries. ODOT will not make payment for materials on site and not installed.

Payment at the contract unit price per square foot shall be full compensation for all labor, materials, equipment, and all incidentals to install the GCS Wall excluding the granular backfill material.

Lightweight Backfill Specification

When necessary for shoulder buildout the contractor shall provide cellular concrete, flowable fill, or other approved alternative to be used as a lightweight backfill material.

Measure of Payment (CY) ODOT will measure lightweight backfill in cubic yards. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price per cubic yard. ODOT will not make payment for partial deliveries. ODOT will not make payment for materials on site and not installed. Payment at the contract unit price per cubic yard shall be full compensation for all labor, materials, equipment, and all incidentals to install the lightweight backfill material.

Formed Shoulder Buildout Specification

When necessary for shoulder build-out, the contractor shall provide materials and labor to construct necessary formwork to receive lightweight backfill to restore roadway shoulder.

Measure of Payment (LF) ODOT will measure formed shoulder buildout based on linear feet installed. Payment at the contract unit price per linear foot shall be full compensation for all labor, materials, equipment, and all incidentals to install the formed shoulder buildout.

Alternate Nail Types These items address potential issues that may arise when repairing slides where the soils are not conducive for open hole drilling and allow for greater flexibility. Per Section 6 of the invitation to bid the following items are proposed equivalents to the nail types in the bid documents in the event the conditions stated above are encountered. Specifications and pricing for alternate nail types including larger diameter soil nails have been provided below.

Permanently Cased Soil Nails/#8 All-Thread Bar

Contractor must furnish either:

Permanently cased soil nails that are a three-stage construction including installation of:

1. An outer tube (minimum 1.5 inch outside diameter, minimum 0.120 inch wall thickness hot-dipped, galvanized steel tube that is mechanically deformed, threaded, or specially galvanized through a drossing process to produce a plurality of surficial asperities). When applicable, provide perforated tubes that can be pressure grouted.

2. Neat cement grout in accordance with ODOT Special Specification 866 (current version), “Ground Anchors” that completely fills the outer tube.

3. A threaded #6 (or larger) inner bar in accordance with ODOT Special Specification 866 (current version), “Ground Anchors” epoxy coated to a minimum or 16 thousandths of an inch in accordance with ASTM A 775.

#8 All Thread Bar that are a two-stage construction including installation of:

1. Neat cement grout in accordance with ODOT Special Specification 866 (current version), “Ground Anchors” that completely fills the outer tube.

2. A threaded #8 (or larger) bar in accordance with ODOT Special Specification 866 (current version), “Ground Anchors” epoxy coated to a minimum or 16 thousandths of an inch in accordance with ASTM A 775. If a galvanized tube is not used centralizers should be placed no more than 2-ft from the ends of the nail and no greater than 5-ft apart.

Measure of Payment (EA) ODOT will measure Permanently Cased Soil Nails/#8 All-Thread Bar in two units of measure. They will be measured up to 20 feet in length. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price per nail. ODOT will not make payment for materials on site and not installed. Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to furnish and place required nails.

Grout for Void Fill

When large voids are encountered when drilling, contractor must furnish a neat cement grout or cellular grout. The grout should be pumped into the void until return is achieved.

Measure of Payment (CF) ODOT will measure grout for void fill in cubic feet. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price cubic foot. ODOT will not make payment for materials on site and not installed. Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to furnish and install the grout.

Incidental Rockfall Items To address a wider variety of rockfall mitigation projects, the following items have been provided to be used, if necessary, in conjunction with the rockfall items specified on the invitation to bid.

Rock Dowel Equipment Mobilization

Contractor shall mobilize the equipment and personnel required to install rock dowels and mesh incidental items, including but not limited to drill rig, grout plant, and air compressor.

Measure of Payment (LS) ODOT will measure rock dowel equipment mobilization as a lump sum item paid on projects including the incidental item “Rock Dowels”. Upon receipt of proper invoices, ODOT will pay for the rockfall equipment mobilization at the Contractor’s lump sum price.

Rock Dowels Specification

Contractor shall furnish rock dowels consisting of continuously threaded grade 75 (ASTM A615) with diameters of 1’’ (#8) or 1.375’’ (#11), that is hot-dip galvanized in accordance with ASTM A153. Anchor bar shall be continuous without splices or welds, new, straight, and undamaged. Only anchors greater than 15 feet in length may be spliced using a mechanical coupler. Bar couplers, if used, shall develop the full ultimate tensile strength of the bar as certified by the Manufacturer.

Contractors must be able to install rock dowels utilizing limited access drilling equipment including but not limited to wagon drills, pallet drills or other drill types as required.

Measure of Payment (LF) ODOT will measure rock dowels in linear feet based on the type of bar utilized. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price per rock bolt. ODOT will not make payment for materials on site and not installed. Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to furnish and place rock bolts.

Rock Mesh Specification

Contractor must furnish and install one of the following type rock mesh depending on application and loading.

Type 1 - Wire Mesh – Standard The standard wire mesh fabric shall be galvanized, hexagonal, double twisted 2.7 mm (0.106 inch) soft tempered steel wire with a maximum Tensile Strength 75,000 psi in accordance with ASTM A975-11). The maximum nominal size of the opening shall be 3.25 inches. Mesh tensile strength shall be a minimum of 2900 lb./ft. parallel to twist. Equivalent or stronger mesh may be substituted.

Type 2 - Wire Mesh – High Tensile Wire mesh fabric other than hexagonal double twisted wire mesh shall be acceptable for high tensile wire mesh. This material shall be galvanized, have a nominal wire diameter of no less than 0.157-inch (4-mm) and have a minimum wire breaking strength of 250,000 psi. The maximum size of the opening shall be 5.43 inches in the largest dimension. The mesh shall have a minimum longitudinal tensile strength or load capacity of at least 17,000 lbs./ft. Seaming of mesh panels shall be in accordance with manufacturer’s recommendations and the drape design drawings. Seaming methods shall be supplied to the Engineer and approved before use. Equivalent or stronger mesh may be substituted.

Measure of Payment (SF) ODOT will measure Rock Mesh in square feet installed. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price square feet. ODOT will not make payment for materials on site and not installed. Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to furnish and place the mesh.

Temporary Rockfall Barrier Specification

Includes designing, installing, maintaining, and removing temporary rockfall barrier. The Contractor is advised that since scaling/trimming operations will entail considerable hazards due to falling rock and debris, the traveling public shall be adequately protected from falling rocks and debris by installing, before scaling or trimming operations are started, temporary rockfall barriers or other devices as approved by the State. The height of the temporary measures shall be a minimum of 8’-0”. Traffic, personnel, equipment, and structures shall be protected from falling rock, falling debris, or other falling material caused by the work completed for this project. Temporary measures may not be required in the case of a roadway that is completely closed where there is no other equipment, personnel, traffic, or structures that will be impacted by the falling rock and debris.

Measure of Payment (LF) ODOT will measure temporary rockfall barrier in linear feet. Upon receipt of proper invoices, ODOT will pay for the materials delivered and installed and accepted at the Contractor’s unit price linear foot of barrier.

ODOT will not make payment for materials on site and not installed. Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to furnish and install the temporary rockfall barrier.

Incidental Support Items Per Section 8 of the invitation to bid document, specifications and pricing for a portable traffic signal rental has been included below. In many instances this provides the safest option to repair slides without having to close the road due to the need to keep one lane closed for the duration of the project.

Portable Traffic Signal Rental Specification

When necessary, contractor should furnish portable traffic signals to close one lane of the road for the duration of the project.

Measure of Payment (WK) ODOT will measure portable traffic signal rental in week increments. Upon receipt of proper invoices, ODOT will pay for the equipment delivered and installed and accepted at the Contractor’s unit price week.

Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to install and remove the temporary traffic signals.

Incidental Testing Items As requested in Section 6 of the invitation to bid, items for soil nail and materials testing have been included below.

Proof Test Specification

When necessary, contractor should conduct proof testing on nails following FHWA Geotechnical Engineering Circular No. 7.

Measure of Payment (EA) ODOT will measure proof tests per each nail tested. Upon receipt of proper invoices, ODOT will pay for the tests accepted at the Contractor’s unit price per each. Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to test the soil nails.

Verification Test Specification

When necessary, contractor should conduct verification testing on nails following FHWA Geotechnical Engineering Circular No. 7. Verification tests require installation of a sacrificial soil nail, which will be invoiced under the appropriate soil nail item.

Measure of Payment (EA) ODOT will measure verification tests per each nail tested. Upon receipt of proper invoices, ODOT will pay for the tests accepted at the Contractor’s unit price per each. Payment at the contract unit price each shall be full compensation for all labor, materials, equipment, and incidentals to test the soil nails.