Page 8-148 M 41-10
8-29 Wire Mesh Slope Protection8-29 Wire Mesh Slope Protection
8-29.1 Description
This Work consists of furnishing and installing the anchors and the wire mesh slope protection in accordance with these Specifications and the details shown in the Plans and in conformity with the lines and dimensions shown in the Plans or specified by the Engineer.
8-29.2 Materials
Materials shall meet the requirements of Section 9-16.4 .
8-29.3 Construction Requirements
8-29.3(1) Submittals
The Contractor shall submit a Type 2 Working Drawing consisting of a wire mesh slope protection plan. The wire mesh slope protection plan shall include the following:
1.Plan sheets for anchor layout and installation, and the equipment and process used to confirm the capacity of the constructed anchors including the calibration data for the stressing devices used to proof test the anchors, as completed by an independent testing laboratory within 60 calendar days of the wire mesh slope work.
2.Working drawings for the temporary yoke or load frame to be used for anchor proof testing in accordance with Section 6-01.9 .
3.Plans and details for assembling wire mesh and erecting the assembled mesh on the slope. All the costs for the Work required for Submittals shall be included in the unit Bid price detailed in Section 8-29.5 .
8-29.3(2) Anchors
The Contractor shall install anchors of the type shown in the Plans and in conformance with the layout shown in the wire mesh protection plan. The spacing and number of the anchors and wire ropes as shown in the Plans are approximate only, and upon review of the wire mesh slope protection plan, the Engineer may arrange the spacing to better hold the wire mesh against the slope. Backfill material shall be thoroughly compacted with a mechanical compactor. The Contractor shall proof test up to 25 percent of the anchors in vertical pullout to the minimum allowable anchor capacity specified in the Plans. Proof testing of anchors shall be performed against a temporary yoke or load frame. No part of the temporary yoke or load frame shall bear within three feet of the anchor being tested. For vertical pullout proof testing, an anchor is acceptable if it sustains the specified capacity for 10 minutes with no loss of load. Anchors that fail this criterion shall be replaced and retested. If more than three anchors fail, the Contractor shall proof test all anchors.
8-29.3(3) Wire Rope
All wire rope loops shall include a thimble. No wire rope splicing will be allowed. M 41-10 Page 8-149 Wire Mesh Slope Protection 8-298-29.3(4) Wire Mesh The wire mesh shall be fastened to the completed wire rope assembly as shown in the Plans. High tensile steel fasteners on the vertical seams shall be staggered across width of the seam. Horizontal splices joining 2 rolls of mesh shall be made by overlapping the mesh approximately 3 feet and either weaving 3 rows of lacing wires through every mesh opening or using 4 rows of high tensile steel fasteners placed on approximately 3-inch spacing. All top and bottom laps shall be made by folding the mesh to the outside, away from the slope, to avoid the possibility of falling material hanging up in the folds. The bottom of the mesh shall be located as shown in the Plans. The ends of all lacing wires shall be secured to the mesh with a minimum of 1½-turns. The wire mesh shall not be tensioned in any direction, but is to remain loose so as to increase its dampening effect on rolling rocks. The Contractor shall use care in the handling and installing of the wire mesh and wire rope. Any mesh or wire rope damaged due to the Contractor’s operations shall be replaced by the Contractor at no expense to the Contracting Agency.
8-29.4 Measurement
Measurement of anchors will be per each for the completed anchor. Anchor types will not be differentiated. Wire mesh slope protection will be measured by the square foot of wire mesh erected on the slope. There will be no deduction made for overlapping the wire mesh material as required for splices or for coverage due to variations in the slope or ground conditions.
8-29.5 Payment
Payment will be made for each of the following Bid items that are included in the Proposal: “Wire Mesh Slope Protection Anchor”, per each. The unit Contract price per each for “Wire Mesh Slope Protection Anchor” shall be full payment for all costs for the Work described in Sections 8-29.3(1) and 8-29.3(2) . “Wire Mesh Slope Protection”, per square foot. The unit Contract price per square foot for “Wire Mesh Slope Protection” shall be full payment for all costs for the Work described in Sections 8-29.3(3) and 8-29.3(4) .
Source: Washington Standard Specifications for Road, Bridge, and Municipal Construction, 2024 Edition. Pages 898–899 of 1,151.