SNS flexible wire mesh application in huangshan scenic area highway slope prevention and control
1 SNS ecological fence technology introduction
SNS flexible protection systems of slope main products can be divided into two kinds of active protection system and passive protective system. System to wire rope as the main components and to cover (active protection and intercept) (two basic types of passive protection to control all kinds of oblique) for geological disasters and avalanche, bank slope erosion, can create the harm such as blasting slungshot, falling objects of flexible protection systems technologies and products. Active protection system of wire rope net on all kinds of flexible network coverage or wrapped in protective slope or rock, to limit the slope rock mass weathering flake or dangerous rock collapse, it mainly reflects its reinforcement effect; Movement control or falling rocks in a certain scope, which reflect their containment action. Then a function is essentially due to the passive protection, but due to its structure formation in the SNS system similar to reinforce the role of active protection system, its into active defense, and respectively called active protection standards and the main – and distinguish between passive protection. When the main – passive protection system cover the blasting excavation work surface, blasting slungshot formed to prevent harm of flexible safety protection system. Passive protection system is given priority to with wire mesh fence type flexible block stone net set in the corresponding position on slope, used to intercept cant tumbled stone on the slope in order to avoid damage to other objects, so sometimes referred to as the block stone net. When set in landslide area, can form a flexible grid of debris flow in the solid particles interception DAMS.
Passive SNS flexible protection system features: flexible and intercept strength enough to absorb and disperse rock fall expected impact kinetic energy, and energy dissipation design and use of further improving the system’s ability to resist shock.
SNS flexible active protection system with high strength wire mesh, diamond ring network, high strength steel wire grid as main components,) and the wire rope net, cover, tighten to prevention and control of slope rock collapse, tumble, blasting slungshot harm such as wire rope flexible protection system.
SNS flexible active protection system is in using the latest international protection and rock slope intercept standards on the basis of the design. Compared with the traditional construction method, the method to overcome the disadvantages of the rigid protection construction adopts the modular installation, shortening the time limit for a project and construction cost, the whole system consists of high strength steel wire rope, flexible bolt installed and other accessory combination and into. System has the following advantages:
1 galvanized high strength steel wire as the main material of active protection system has the advantages of high protection strength, easy to spread out.
2 through times of slope protection engineering field test and contrast, have to adapt to the installer standardization, systematization, etc; Any slope topography;
3 SNS ecological fence project has on the technology is feasible, safe and reliable, economically rational, and does not destroy the ecological environment, etc.
2 project summary
Huangshan scenic tourist road Z103 line cloud valley temple to tangkou 11 km, because of the complexity of the highway geologic environmental conditions and to build a road when the artificial slope cutting causing high dangerous rock mass, the dangerous rock mass after decades of rock weathering, collapse often produce impellers, poses a serious threat to passing travellers and the safety of the vehicle, especially Z103 line K0 + 150 – K0 + 150 section is across the parking lot, is the most concentrated and tourists and vehicles frequented place, therefore, must reinforce the prevention and control of this slope. Because of the reinforced slope is located in the scenic route, and if the conventional concrete shotcreting methods slope reinforcement will damage the original appearance shape and ecological environment, serious impact on the overall natural environment features of huangshan scenic spot. In order to achieve both reinforcing the slope and protect the original ecological environment and natural environment, the purpose of huangshan scenic area transport for reference international advanced technology of SNS flexible fence.SNS flexible wire mesh
SNS flexible net is a new type of high strength material made of diamond wire mesh, its latest inventor a Swiss company and the field argument applies to scenic slope reinforcement and protection. SNS flexible wire mesh shield technology’s biggest advantage is not destroy the original ecological environment, is conducive to the prevention and control of the slope plant growth again. The SNS flexible fence using anchor fixed inside the slope rock mass governance combined with prevention and treatment effect, can be sufficient to keep the soil in the area of the protection, the stability of the rock. Planting trees of green, the engineering protection and natural environment be in harmony for an artificial grass, body, achieve the harmonious unification.
Three engineering design and construction
3.1 the engineering design
For a single dangerous rock mass using random anchor rod anchor, the lack of overall stability of slope by a certain spacing of anchor rod anchor series. For uncertain, GuShi, pieces of rock slope surface, because of its stability is difficult to master, mixed size, difficult to distinguish clearly, one by appropriate for the overall protection. To minimize dry construction on the traffic convenient, ensure the slope landscape effect not to undermine, using SNS webmaster interference, the flexible protection technique, main is to prevent the rock slide and collapse. Maximum slope height of 20 m, the design USES the SNS flexible protection systems, steel rope bolt hole phi 42 mm, 3 m long, SNS network, hang a total of 1 656 m2.
3.2 engineering construction SNS flexible wire mesh
3.2.1 construction process
The prevention and control of slope mainly adopts SNS flexible fence system reinforcement scheme, construction sequence is: clear the slope – take the hands and feet frame – random bolt and grouting construction – steel rope bolt – grouting to the net, to clean up the scene, the completion of the completion acceptance.
3.2.2 remove dangerous rock
Cleaning requirements of dangerous rock is as follows:
1 top-down practices, it is forbidden to face up and down in the same segment;
2 using artificial and simple mechanical cleaning, such as small crowbar, adopts the drilling method and foot are strictly prohibited to move