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| Fence netting installation method |
Fence netting installation methods and steps
A, and site preparation
1, where no special reserve value, make the system of construction installation cannot fully implement of trees. From the perspective of environmental protection, on most of the damage of slope vegetation is only temporary, due to the openness of the system, the stumps left will be through the mesh to the growth of new branches.
2, remove eluvial soil slope, affecting the safety of construction and pumice. Under the condition of some slope, slope aggradation, pumice is endless, as long as it can ensure the safe implementation of the system, is clear of all unnecessary, in fact, in some cases, if can clear all, flexible protection projects may not necessary protective measures or it can be more economical.
Second, the alignment
Pay-off work to determine the specific anchor hole site position. According to the design of the anchor spacing requirements, generally it is base point with between the side slope foot, gradually to determine the anchor position, on the other side and above, in the process should pay attention to the following situation:
1, when need digging pits in orifice, the anchor hole positioning time make full use of existing concave and convex slope characteristics, as far as possible within the range permitted span adjustment set the anchor hole directly in the natural pits, to reduce the artificial digging work.
2, in case of a standard hole located in rock mass is very loose, broken, may bring into the hole is difficult, or encounter GuShi or pumice, could lead to drilling risk, in these cases, should make full use of allowable span adjustment range, small scale appropriately adjust the anchor position.
Three, into a hole
1, generally USES light jap drill bolt holes.
2, drilling generally should adopt the construction sequence of top-down, in the process can be cleared to has not yet been fully the influence of construction safety of slope aggradation, pumice to clean again.
3, should be in commonly before drilling or drilling at the same time, in the orifice area meet the design requirements of depressions, its main role is to make the location through the anchor exposed ring set can support line with slope, so the size can make the bolt exposed above the top of the ring set point is not orifice in the ground. The following two cases are not artificial digging pits, itself is the anchor hole in meet the requirements of natural pits, slope between the two is the prison near the anchor hole bumps or lone cliff stone, because in this case will support rope dangling on even if the anchor hole, but across convex body when it is to stick close to slope surface.
4, wire rope bolt anchoring segment is two root and wire rope, made of phi 16 wire rope bolt diameter is 32 mm, flat direction of the bolt hole diameter should be bigger than the size of at least 10 mm; As hole equipment co., LTD., can consider to drill in the same position of two adjacent about different azimuth, small "people" glyph bolt hole diameter, can make the two wire rope of the anchor rod anchor into the two hole, respectively, to meet the requirements of the anchoring force.
5, and other anchorage engineering, the orientation of the bolt hole shall generally be perpendicular to the slope surface as far as possible, or in judging the potential sliding surface (including joints and fissures of discontinuous surface) as far as possible with the potential sliding surface of the vertical.
Four, anchor installation
1, the installation of cable anchor is similar to normal reinforced mortar anchor, in order to ensure the mortar body a good coherence with the hole wall and the anchor rod body is wrapped, also need to wash the hole, and in the rod body. Because of the flexibility of the wire rope bolt and flat characteristics, in the case of anchoring depth is not more than 3 m, can easily by artificial stirring rod body to make uniform paste in hole in full, when the anchoring depth greater, generally adopts mechanical grouting should be taken into account.
2, it is important to note in the pits of orifice unfavorable lien mortar body, will never allow mortar anchor exposed ring set completely buried, or support the installation of the line would be very difficult.
Five, the support line installation
1, support line installation is simple, to a certain length of the wire rope end through the end of the bolt of the leakage ring set with a fixed rope card, one by one through the same row or column anchor exposed ring set, until the support, anchor in the end of the rope tension capacity not less than 10 kn tightener or gourd taut support rope, with the same specification will be fixed at the end of the complete line card.
2, in theory, can support the length of the rope is not restricted, even in order to reduce the number of fixed point, the length as long as possible, however, due to the existence of the pits of orifice, tensioning state support line is not a straight line, long support rope may become excessive tension resistance and it is difficult to tension, therefore, general maximum length of single prop up rope control should be around 30 m; In addition, when vertical and horizontal bracing rope design specification is not at the same time, the single rope support should be installed in the same row or column, only in the design specification phase at the same time, in order to avoid the corners are too short and leave too much support rope waste materials of fixed points, can consider from the steering column or from column to row to install.
3, for highway guardrail net system, because does not require a tight rope, so in the premise of easy to transport and install, can make the single support long rope as much as possible.
4, must pay attention to the support line installation time, generally before installation bolt mortar solidification period of at least three days.
Six, grille, hang
1, cuts in from the construction safety and reduce the workload, grille shop hanged on general should be downwards, network block should overlap between one or two rows of mesh width and plunge into silk tie (tie spacing generally is about 1 m), should make the network block as flat as possible and close to slope surface.
2, although we hang the grille shop here in the support line installed, and it is also the scene of the general common process, but if the conditions permit, in supporting rope before you install pave hanging close to slope surface grid may be more conducive to system, and also can improve the safety of construction, although this part is likely to increase the difficulty of installation.
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