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Bank Revetment Project( High-Resistance Netting ) |
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| High-Resistance Netting is ideally suited for difficult solutions to rock face problems, since the double-twist, hexagonal-woven mesh does not unravel when wires abrade. Fractured stones are trapped and confined against the slope should isolated wires fatigue from prolonged stress. Additionally, this double-twisted hexagonal type of netting has the high mechanical resistance required to prevent the danger of sudden rock shock loads and dissipate rock fall energy created from loose fractured rock. In times past, the danger represented by falling rocks and by rocky debris from slopes overhanging the road side was not given the requisite consideration. Land was not at the premium it is today since traffic volume and patterns have changed drastically. In recent years, however, the widening of existing roads and the opening of new roads and highways must accommodate modern transportation demands. For this reason we are faced with the problems of protecting the road side from rock slides in a safe and efficient manner. |
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| premium it is today since traffic volume and patterns have changed drastically. In recent years, however, the widening of existing roads and the opening of new roads and highways must accommodate modern transportation demands. For this reason we are faced with the problems of protecting the road side from rock slides in a safe and efficient manner. |
Applications and Placing Schemes:
The placing of rock fall netting can vary according to the slope, its geophysical nature, the sizes of the loose boulders and the possibility of anchoring the top and base of the netting. As soil and slopes can have different characteristics each time, we are presenting only general criteria for carrying out protection with high-resistance, hexagonal double-twisted mesh netting.
Anchoring the Top:
On top, the netting must be firmly anchored to the soil and possibly folded on itself for one foot to one and one-half feet. A general method of placing cannot be suggested, as different systems should be adopted according to the nature and condition of the soil. |
The following are the most common methods:
Anchoring the Face:
If necessary, before laying the netting, the slope must be reclaimed, blasting to remove all loose rocks and boulders. The netting sheets (15 feet wide) shall be carefully tied together using lacing wire or interlocking fasteners at the sheet overlap.
Where overlapping occurs, usually at the vertical splice of adjoining sheets, a minimum one-foot overlap is recommended. Horizontal splices may be required as job site conditions dictate. In these situations, refer to the design engineers' splicing detail.
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When it is necessary to prevent loose rocks from cascading down the slope, a suitable sheet of gabion mesh shall be anchored to the rock face of either drilled and grouted anchors or to a designed grid system (10 to 15 square yards). The type of anchorage to be used will vary according to the slope characteristics (please refer to Item 1). |
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