JP6297369B2 - Protective net structure reinforcing method and protective net structure reinforcing structure - Google Patents

Description

  The present invention relates to a reinforcing method and a reinforcing structure for reinforcing a protective mesh structure installed on a slope where rockfall may occur.

  Generally, there is a pocket-type rockfall protection net as a protection net structure installed on a slope where rockfall may occur. The pocket-type rockfall protection net is provided with an entrance for introducing rockfall between the slope and the wire mesh by providing a support on the slope and hanging the wire mesh from the support. The pocket-type rockfall protection net has a function of absorbing the kinetic energy of the rockfall by colliding the rockfall entering from the entrance with the wire net and guiding the rockfall to the bottom.

  However, after the installation of the rockfall protection net, if there is a possibility that a larger rockfall would occur than expected at the time of design, it was necessary to replace it with a new protection net structure to absorb the kinetic energy.

  Moreover, since the state of the slope where rockfall occurs, the angle of inclination, the size of rockfall, etc. vary, the kinetic energy of each rockfall also varies. At the time of designing, the strength of each member in the protective mesh structure is set assuming the maximum kinetic energy among the individual kinetic energies, but the situation at the actual installation position is not necessarily within the assumed range.

  Furthermore, when a part of the protective net structure is damaged due to falling rocks, it is necessary to remove members around the damaged portion and replace them with new members. In addition, even in the case of aging, it is necessary to remove the aging member and replace it with a new member. In either case, it is necessary to remove the member, and waste is generated. The removal and replacement work takes a lot of time.

  Therefore, as a method of reinforcing the protective mesh structure, instead of replacing it with a new protective mesh structure, for example, Patent Document 1 discloses a fallen object protection device by providing a reinforcing mesh outside or / and inside the protective mesh. A reinforcing method for reinforcing is disclosed.

JP2013-256845A

  However, in the reinforcement method of patent document 1, the load which acts on a protection net | network when a falling rock collides with a protection net | network by providing a reinforcement net | network increases. As a result, the load acting on the rope or anchor that supports the protective net also increases, and the rope or anchor may be damaged.

  The present invention has been made based on the above-described conventional problems, and an object of the present invention is to provide a reinforcing method and a reinforcing structure for reinforcing an existing or new protective net structure more firmly.

The reinforcing method according to the present invention is connected to a vertical rope suspended from a slope, a first horizontal rope installed so as to intersect the vertical rope, and the vertical rope and the first horizontal rope. A reinforcing method for reinforcing a protective mesh structure comprising a first protective mesh , wherein the two adjacent vertical ropes are adjacent to the two adjacent first lateral ropes outside the first protective mesh. A plurality of second protection nets are installed so as to cover an area surrounded by the two, and the two adjacent second protection nets are arranged so as to overlap each other, and the plurality of second protection nets are arranged on the vertical rope. Connecting the vertical auxiliary rope provided between the two vertical ropes and the first protective net, and connecting a portion where the two adjacent second protective nets overlap to the one vertical rope. And a second horizontal rope connected to the second protective net. A step of fixing a rope fixing portion for fixing the second lateral rope to the slope, and a step of connecting both ends of the second lateral rope to the rope fixing portion. It is characterized by.

  And a step of folding the upper end of the second protective net so as to wind the second horizontal rope, and connecting the second protective net and the second horizontal rope in the folded state. preferable.

  In the step of connecting the second protective net and the second horizontal rope, it is preferable that the second protective net is further connected together with the first protective net.

The reinforcing structure according to the present invention includes a plurality of support columns erected on an inclined surface, a support column fixing unit that fixes a lower end portion of the support column to the inclined surface, and an upper end portion of the support column that allows the support column to stand up against the inclined surface. A suspension rope connected to the suspension rope, a suspension rope fixing portion for fixing the suspension rope to the slope, a vertical rope suspended from an upper end portion of the column, and a first rope provided to intersect the vertical rope A horizontal rope, a first horizontal rope fixing portion for fixing the first horizontal rope to the slope, a first protective net connected to the vertical rope and the first horizontal rope, and the first A second protective net provided to cover the protective net, a second horizontal rope connected to the second protective net, and a second horizontal rope fixing for fixing the second horizontal rope to the slope comprising a part, the said second protection network, of two adjacent first A plurality of the second protection nets are arranged so as to cover a region surrounded by the horizontal rope and the two adjacent vertical ropes, and the two adjacent second protection nets are arranged to overlap each other. The protective net is connected to the first horizontal rope, the vertical rope, the vertical auxiliary rope provided between the two vertical ropes, and the first protective net, and the two adjacent second second ropes. A portion where the protective nets overlap is connected to one vertical rope .

  According to the reinforcing method of the present invention, an existing or new protective net structure can be reinforced more firmly. According to the reinforcing structure of the present invention, it is possible to capture a falling rock that has collided more safely. In addition, according to the reinforcing structure of the present invention, the mass of the entire protective net is increased, so that the energy absorption performance is improved.

It is an expanded view for demonstrating the reinforcement structure which concerns on embodiment. It is a side view for demonstrating the reinforcement structure which concerns on embodiment. It is a figure for demonstrating the (A)-(E) reinforcement method.

  Hereinafter, a reinforcing structure according to an embodiment of the present invention will be described with reference to the drawings.

  1 and 2 are views for explaining a reinforcing structure according to the present embodiment, in which FIG. 1 is a development view and FIG. 2 is a side view.

  The reinforcing structure 100 includes a plurality of columns 1 (1a, 1b,..., 1f) erected on the slope S and a column fixing part 2 (2a, 2b,...) That fixes the lower end of the column 1 to the slope S. 2f), the suspension rope 3 (3a, 3b,..., 3f) connected to the upper end of the support column 1 in order to erect the support column 1 with respect to the inclined surface S, and the suspension rope 3 on the inclined surface S Suspension rope fixing portion 4 (4a, 4b,..., 4f) to be fixed, vertical main rope 5 (5a, 5b,..., 5f) suspended from the upper end of each support column 1, and vertical main A vertical auxiliary rope 6 (6a, 6b,..., 6e) provided between the ropes 5 and a first horizontal main rope 7 (7a, 7b, 7c) provided so as to intersect with the vertical main rope 5. A first horizontal main rope fixing portion 8 (8a, 8b,..., 8f) for fixing the first horizontal main rope 7 to the slope S, and a vertical main row 5, the vertical auxiliary ropes 6 and the first of the first protective network 9 with protective mesh structure 101, with a connected next main rope 7, a so-called pocket type rockfall protection network, a reinforcing structure for reinforcing the.

  The reinforcing structure 100 further includes a second protective net 10 provided so as to cover the first protective net 9, and a second horizontal main rope 11 (11a, 11b) connected to the second protective net 10. And a second horizontal main rope fixing portion 12 (12a, 12b, 12c, 12d) for fixing the second horizontal main rope 11 to the slope S. The protective net structure 101 can be reinforced by the second protective net 10, the second horizontal main rope 11 and the second horizontal main rope fixing portion 12.

  The material of the first protective net 9 and the second protective net 10 is not particularly limited as long as it can disperse the load generated by the collision of falling rocks. For example, it is a metal net. The wire diameter, mesh size, strength, etc. of the wire mesh are appropriately selected in consideration of the expected size, weight, etc.

  The second protective net 10 is provided on the outside (road side) of the first protective net 9, and the portion where the second protective net is installed has a double structure. The location where the second protection net is installed is not particularly limited, and is appropriately selected according to the expected position of falling rocks.

  The absorbed energy of the protective net structure is calculated mainly as the total energy of the absorbed energy of the first protective net 9, the absorbed energy of the first horizontal main rope 7, and the energy difference before and after the collision. The strength of the first protective net 9 and the first horizontal main rope 7 is set so that the absorbed energy of the protective net structure is larger than the kinetic energy of falling rocks.

  Further, the reinforcing structure of the present invention has the absorbed energy of the total energy difference between the absorbed energy of the first protective net 9 and the first horizontal main rope 7 and the energy before and after the collision less than the kinetic energy of the falling rock. What is necessary is just to have.

  Next, a method for reinforcing the protective net structure will be described with reference to FIGS. Hereinafter, a method for reinforcing the protection net structure 101, that is, a so-called pocket type rockfall protection net by the second protection net 10, the second horizontal main rope 11 and the second horizontal main rope fixing portion 12 will be described.

  First, the second protective net 10a is placed on a predetermined position of the first protective net 9 outside the first protective net 9 (on the road side). As shown in FIG. 3A, the second protective net 10a covers a region surrounded by two adjacent first horizontal main ropes 7a, 7b and two adjacent vertical main ropes 5a, 5b. Thus, it is formed in a rectangular shape larger than the region. The four sides of the second protective net 10 are arranged at positions separated from the first horizontal main ropes 7a and 7b and the vertical main ropes 5a and 5b by a predetermined distance. The distance between the upper side of the second protective net 10a and the first horizontal main rope 7a is set so that the second protective net 10a can be folded back.

  As shown in FIG. 3A, the second protective net 10a is connected to the first horizontal main rope 7a on the upper stage side by a binding member. A plurality of binding members are installed at intervals. After the connection, the upper end of the second protective net 10a is folded back to the slope side.

  As shown in FIG. 3B, the second protective net 10a is connected to the vertical main rope 5a and the first protective net 9 with a coupling coil. Further, the second protective net 10a is connected to the vertical auxiliary rope 6a and the first protective net 9 by a coupling coil.

  As shown in FIG. 3C, similarly to the second protective net 10a, an area surrounded by two adjacent first horizontal main ropes 7a and 7b and two adjacent vertical main ropes 5b and 5c. The second protective net 10b is installed so as to cover. The second protective net 10a and the second protective net 10b are installed so as to overlap. The 2nd protection net | network 10b is connected to the 1st horizontal main rope 7a of the upper stage side with a binding member. In the portion where the second protective net 10a and the second protective net 10b overlap, the second protective net 10a and the second protective net 10b are connected to the vertical main rope 5b and the first protective net 9 by a coupling coil. Connecting. Further, the second protective net 10b is connected to the vertical auxiliary rope 6b and the first protective net 9 by a coupling coil. By repeating the same operation, the entire area surrounded by the first horizontal main ropes 7a and 7b and the vertical main ropes 5a and 5f is entirely doubled by the first protective net 9 and the second protective nets 10a to 10e. It becomes a structure.

  As shown in FIG. 3D, the second horizontal main rope 11a is arranged at a position spaced a predetermined distance downward from the upper first horizontal main rope 7a. The 2nd horizontal main rope 11a is temporarily fixed to the 2nd protection net | network 10a-10e with a number line. Similarly, the second horizontal main rope 11b is arranged at a position away from the first horizontal main rope 7b on the lower stage side by a predetermined distance. The 2nd horizontal main rope 11b is temporarily fixed to the 2nd protection net | network 10a-10e with a number line.

  The second horizontal main rope fixing portions 12a, 12b, 12c, 12d are fixed to the slope, and both end portions of the second horizontal main rope fixing portions 11a, 11b are connected to the second horizontal main rope fixing portions 12a, 12b, 12c, 12d. Connecting.

  As shown in FIG. 3E, the upper ends of the second protective nets 10a to 10e are folded back so as to wind up the second horizontal main rope 11a on the upper stage side, and the second protective nets 10a to 10e are folded back. And the second horizontal main rope 11a on the upper stage side are connected by a coupling coil. Further, the second protective nets 10a to 10e and the second horizontal main rope 11b on the lower stage side are connected by a coupling coil without being folded back at the lower ends of the second protective nets 10a to 10e. When connecting the second protective nets 10a to 10e and the second horizontal main ropes 11a and 11b, the first protective net 9 may be connected together by a coupling coil.

  According to the reinforcing method as described above, since the protective net structure is reinforced by the second protective net, the second horizontal main rope, and the second horizontal main rope fixing part, the protective net is formed into a double structure. The load which increases can be borne by the second horizontal main rope and the second horizontal main rope fixing portion, and damage to each member can be prevented.

  Moreover, in this invention, it is possible to change suitably the combination of the wire diameter of a 2nd protection net | network, a scale, intensity | strength, and the wire diameter and intensity | strength of a 2nd horizontal main rope. By calculating the deficit of possible absorbed energy of the existing or new rockfall protection net with respect to the kinetic energy of rockfall, it can be properly reinforced and economical.

  Further, by connecting the second protective net and the vertical main rope, and the second protective net and the vertical auxiliary rope, the integrity is ensured as the reinforcing structure, and the reinforcing effect is high.

  Further, the second protection net and the second horizontal main rope are connected to each other, and both ends of the second horizontal main rope are connected to the second horizontal main rope fixing portion fixed to the slope. It is possible to smoothly transmit the load generated in the protective net to the second horizontal main rope and the second horizontal rope fixing portion.

  Furthermore, the upper end side of the second protection net is folded back so as to wind the second horizontal main rope on the upper stage side, and the second protection net and the second horizontal main rope on the upper stage side are connected in the folded state. Thus, it is possible to prevent the second protective net from slipping off due to gravity and to be fixed more firmly.

<Others>
In addition, this invention is not restricted to the said embodiment, In the range which does not exceed the range of this invention, it can change suitably. For example, in the above embodiment, a coupling coil or the like is used to connect the protective net and various ropes, but there is no particular limitation as long as it is a connection member.

  In the above embodiment, the second horizontal main rope is positioned at a predetermined distance downward from the first horizontal main rope on the upper stage side and at a predetermined distance upward from the first horizontal main rope on the lower stage side. Although an example of arranging one by one is shown in FIG.

S slope 1 support 2 support fixing part 3 suspension rope 4 suspension rope fixing part 5 vertical main rope 6 vertical auxiliary rope 7 first horizontal main rope 8 first horizontal main rope fixing part 9 first protective net 10 second Protective net 11 Second horizontal main rope 12 Second horizontal main rope fixing part 100 Reinforcement structure 101 Protective net structure

Claims (4)

A vertical rope suspended from a slope, a first horizontal rope installed to intersect the vertical rope, and a first protective net connected to the vertical rope and the first horizontal rope. A reinforcing method for reinforcing the protective net structure provided,
A plurality of second protection nets are installed outside the first protection net so as to cover a region surrounded by two adjacent first horizontal ropes and two adjacent vertical ropes. The two second protective nets are arranged to overlap each other, and the plurality of second protective nets are arranged as the vertical rope , the vertical auxiliary rope provided between the two vertical ropes, and the first protective net. And connecting a portion where two adjacent second protective nets overlap to one vertical rope ; and
Connecting a second lateral rope to the second protective net;
Fixing a rope fixing portion for fixing the second lateral rope to the slope;
Connecting both ends of the second lateral rope to the rope fixing part;
A reinforcing method comprising the steps of:   And a step of folding back the upper end side of the second protective net so as to wind the second horizontal rope and connecting the second protective net and the second horizontal rope in the folded state. The reinforcing method according to claim 1, wherein the reinforcing method is characterized.   The reinforcing method according to claim 2, wherein in the step of connecting the second protective net and the second horizontal rope, the second protective net is further connected together with the first protective net. A plurality of struts erected on the slope, a strut fixing portion that fixes the lower end of the strut to the slope, and a suspension rope connected to the upper end of the strut to erect the strut with respect to the slope; A suspension rope fixing portion for securing the suspension rope to the slope, a vertical rope suspended from an upper end portion of the support column, a first horizontal rope provided to intersect the vertical rope, and the first A first horizontal rope fixing portion for fixing a horizontal rope to the slope, a first protective net connected to the vertical rope and the first horizontal rope, and a cover for covering the first protective net. comprising a second protection network, and a second horizontal rope connected to said second protection network, and the second horizontal rope fixing portion for fixing the second horizontal rope to the slope, said first Two protective nets are adjacent to the two adjacent first horizontal ropes. A plurality of the second protection nets are arranged so as to cover an area surrounded by the vertical rope, and the two adjacent second protection nets are arranged to overlap each other. Are connected to the horizontal rope, the vertical rope, the vertical auxiliary rope provided between the two vertical ropes, and the first protective net, and the portion where two adjacent second protective nets overlap is 1 A reinforcing structure connected to the two vertical ropes .

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