JP5037306B2 - High absorption type protective net work for rock fall energy - Google Patents

Description

  The present invention relates to a rock-absorbing energy-absorbing protective net construction, and more particularly to a high-absorbing-energy rock-falling protective net that reduces the impact of rockfall by increasing the weight of the net.

  In adopting the stand-by type rock fall prevention method, calculate the kinetic energy of the rock fall of the size existing on the slope, select the material and strength of the net that can withstand that energy, consider the deceleration effect after the net collision, etc. The specification as a safety standard has been decided.

  Of the conventional methods, the pocket-type rock net receives the impacted rocks with a net, but the net is not formed by a wire rope to resist the large rock fall energy. In addition, since there is little or no deformation of the net of the net, the action of absorbing the kinetic energy of falling rocks is not likely to be effective.

  The present invention has been made in view of the above problems, and the object of the present invention is to increase the weight of the net to make it easy to receive the falling rock with the net, and to absorb the kinetic energy of the falling rock. It is to allow deformation, and to provide a rock-absorbing energy-absorbing protective net that aims to improve the safety of the pocket lock net.

  The present invention is applied to a rock fall protection net work in which a net forming a pocket is suspended on an inclined ground. The feature is that referring to FIG. 2, the wire ropes extending vertically to form the protective net are arranged in a zigzag shape, and the zigzag shapes of the adjacent wire ropes are reversed in the left-right direction. A weight having a fixed hole for integration with the inserted wire rope and a non-fixed hole through which the inserted wire rope is slidably passed is disposed at an approaching portion between adjacent wire ropes. The adjacent one of the wire ropes is fixed to the fixing hole at every other weight, and the other weight is slidable through the non-fixing hole. The other adjacent wire rope is slidable in the non-fixed hole of the weight that fixes one of the wire ropes, and is fixed in the fixed hole of the weight that makes one of the wire ropes slidable It is that.

  When the net receives an impact load due to the collision of a falling rock, the net whose weight has been increased by attaching a weight counters the kinetic energy of the falling rock and weakens the kinetic energy of the falling rock. The mesh formed by the zigzag wire rope is deformed by the wire rope sliding in the non-fixed hole, and the impact of falling rocks is reduced based on the surface deformation of the net.

  A rock-absorbing energy-absorbing protective net construction according to the present invention will be described in detail with reference to the drawings. In this net work, a net forming a pocket in the space below the pocket support shown in FIG. 3 is suspended from an inclined ground as shown in FIG. As shown in FIG. 2, the protective net is formed by wire ropes extending vertically, which are arranged in a zigzag shape, and the zigzag shape of the adjacent wire ropes is reversed left and right.

  A weight is disposed at an approaching portion between adjacent wire ropes. The weight includes a fixed hole for integration with the inserted wire rope, and a non-fixed hole through which the inserted wire rope is slidably passed. The fixed hole and the non-fixed hole are defined by sandwiching a partition wall that is elongated in the vertical direction with a broken line in the center of the weight, but the fixing bolt is inserted into the rope so as to line up with the rope, and is drawn small. The wire rope can be fastened to the fixing hole by the wedge action of the conical nut.

  As can be seen from FIG. 2, the postures of the weights are the same, and the left-right relationship between the fixed hole extending vertically and the non-fixed hole is the same. That is, one adjacent wire rope is fixed to the fixing hole every other weight, and the other weight is slidable in the non-fixing hole. The other adjacent wire rope is slidable in a non-fixed hole of a weight that fixes one wire rope, and is fixed in a fixed hole of a weight that allows one wire rope to slide.

  Since the wire rope is slidable in the non-fixed hole, the wire rope can be displaced from the weight due to the tension change of the wire rope that acts when the net receives a falling rock. In other words, the weight changes from the original position. Due to such behavior, the surface of the net is likely to deform from the state as shown in FIG. 3 as shown in FIG. This deformation acts to reduce the impact of falling rocks and increases the safety of the net.

  Since the weight itself increases the weight of the net, it improves the ability of the net to resist the kinetic energy of falling rocks. That is, even if the inertia of the falling rock acts on the net, the energy is weakened by the amount of inertia of the net.

  Eventually, the kinetic energy of the fallen rock at the time of collision with the net seems to have been reduced compared to the case of the net without a weight, and further, the deformation of the net immediately after the collision absorbs the kinetic energy of the fallen rock. The energy difference before and after the collision is calculated by comparing the weight of the falling material with the weight of the erected material. Therefore, as the weight of the construction material increases, the absorbed energy increases. Therefore, the energy difference between before and after the collision is increased by adding a highly economical member such as hollow cast iron or concrete block to the weight of the construction material. It is trying to make it.

The construction front view of the high absorption type protection net construction of rock fall energy of the present invention. Detailed construction status of weight and wire rope. Side view of construction of high-absorption type protective net work for rock fall energy. The situation figure when falling rocks act.

Claims (1)

In the rockfall protection net work where the net that forms the pocket is suspended on the slope,
The wire ropes extending up and down forming the protective net are arranged in a zigzag shape, and the zigzag shape of the adjacent wire ropes is reversed left and right,
A weight provided with a fixing hole for integrating with the inserted wire rope and a non-fixing hole for allowing the inserted wire rope to pass slidably is disposed at an approaching portion between adjacent wire ropes,
One adjacent wire rope is fixed to its fixed hole every other weight, and the other weight is slidable in the non-fixed hole,
The other adjacent wire rope is slidable in the non-fixed hole of the weight that fixes one of the wire ropes, and is fixed in the fixed hole of the weight that makes one of the wire ropes slidable High absorption type protective net work of rock fall energy characterized by.

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