0005 CFT Supplemental_Specification_939.02 SIGNED.pdf
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- Solicitation number
- 12445123R0034
- Issued by
-
Department of Agriculture Forest Service
About this file
This document includes a federal contract solicitation and related project specifications for trail improvements. The solicitation is for a firm-fixed price construction contract with the USDA Forest Service to improve segments of the Catawba Falls Trail in the Pisgah National Forest in North Carolina. Work includes constructing elevated boardwalks and stairs, resurfacing over 5,300 linear feet of existing trail, modifying an existing retaining wall design to use dry-stacked rock, and other repairs such as slide area fixes and turnaround creations. Contractors must have experience building in remote locations that involve crossing streams/rivers and working on mountainsides and slopes. The submission deadline is July 18, 2023 at 1:00pm EST. A site visit is scheduled for June 28, 2023 and the last day for questions is July 10, 2023.
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Text version
939.02 – Construct Micro-Pile Retaining Wall
Description
939.02.01 This work consists of the construction of a reinforced concrete micro pile retaining wall as well as the fabrication and installation of rail post base plates on top of the completed wall.
Materials
939.02.02 A reinforced concrete micro pile retaining wall shall be provided in accordance with the project drawings contained within the project plans. Reinforced concrete shall be minimum 28-day compressive strength of 3,000 psi. Reinforcing steel shall be ASTM A615, Grade 60 steel. Steel pipe piles (casing) used in construction of the retaining wall shall be API N-80 with a nominal yield stress of 80 ksi and cross section as shown on the drawings. Base plates for the rail posts shall be as described in the “General Notes” as well as the hardware to install the base plates on top of the completed micropile wall. Schedule 40 2” PVC shall be used for the weepholes at the bottom of the wall. Washed stone shall be used to backfill the wall to ensure drainage except for the last 2’ of exposed fill which shall be native material. Contractor shall submit proposed methods of drilling and grouting prior to beginning construction, which shall be approved by the COR and/or Engineer of Record.
Construction
939.02.03 Construct the micropile wall at the location SHOWN ON THE PLANS. Minimum length below ground shall be 10’ total with casing to extend minimum 5’ into rock. Micropile construction method shall be Type A with the casing left in place as the reinforcement for the wall. Minimum compressive strength 5,000 psi grout shall be utilized to fill the casing with a #10 bar in the center of the casing. Rail post base plates may be anchored by pushing into fresh concrete or epoxy anchored after concrete setting.
Measurement and Payment
939.02.04 Measurement of this pay item shall be made at the unit price LS for Micropile Retaining Wall installed and approved and payment will be full compensation for the work prescribed in this section and as SHOWN ON THE PLANS.
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