JP3619962B2 - Rock fall protection prop - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a rock fall protection technique in which a slope is covered with a net and rock fall from the slope is accommodated in the net so as not to roll onto a road surface, and more particularly to a rock fall protection column.
[0002]
[Prior art and problems to be solved by the invention]
Rock fall protection work is applied to slopes where rockfalls are likely to occur and slopes where rock fall is likely to peel off from the basement rock. In particular, as a kind of fall rock protection work, a mesh body covering the slope is formed with vertical and horizontal ropes combined with vertical and horizontal wires and wire mesh, and each horizontal rope and vertical rope at the intersection of the vertical and horizontal ropes with a certain holding force. When connected with holding metal fittings, when a force greater than the holding frictional force is applied, the holding part of the rope moves to provide a buffering action, making the net itself elastic, and further to the slope As for the installation of, we proposed a construction method that absorbs the impact of falling rocks by fixing the end of the appropriate lateral rope to the slope through a buffer part that stretches the lateral rope when a certain level of tension is applied (Japanese Patent Laid-Open No. 11-148113).
[0003]
Here, with respect to the support for suspending the net body, a buffer member is provided on the support rope of the support, and the support itself is configured to absorb the shock by the support operation of the support with the base portion as a hinge mechanism. . For this reason, no countermeasure is taken when the base is directly impacted, that is, when the shock cannot be absorbed due to the support lying down. Therefore, the present invention proposes a novel rock fall protection column provided with a solution to the above problem.
[0004]
[Means for Solving the Problems]
The present invention is a cylindrical structure of a plurality of support columns arranged substantially horizontally on a slope, standing on a base formed on the slope, connected to an anchor fixed to the slope, and the holding rope exposed to the outside from the base, It is characterized in that a holding metal fitting that moves the rope holding portion when a tension of a certain level or more is applied at a portion that is passed through an upright column on the base and exposed to the outside of the column is characterized.
[0005]
Therefore, when a falling rock collides with the support, the rope holding portion is moved. That is, against the impact force that collides with the upper part of the support and causes the support to fall, the support falls by moving the rope holding part, and when it collides with the base of the support, the root part shifts to the side by moving the holding part of the rope.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described. The member used for the construction method shown in the embodiment is composed of a vertical and horizontal ropes 1a and 1b, a mesh body A composed of a wire mesh 2 and a connecting bracket 3, a rope portion 4 and a support column 5, and the mesh body A These are a support column B for suspending the suspension, a buffer member 6 for buffer connection of each part, and a lock anchor 7 as a basis for fixing the slope.
[0007]
The mesh body A is a combination of the vertical and horizontal ropes 1a and 1b, the entire mesh formed of the vertical and horizontal ropes is covered with the wire mesh 2, and the horizontal ropes and the vertical ropes at the intersection of the vertical and horizontal ropes are connected by the connecting metal fittings 3. is there.
[0008]
As shown in FIGS. 6 to 8, the connecting fitting 3 includes an intermediate body 31, two holding bodies 32 a and 32 b, a holding bolt 33, and a nut 34. The intermediate body 31 is a plate-like member having an elliptical shape. The intermediate body 31 has grooves 311 and 312 drilled in directions intersecting each other on the front and back surfaces thereof, and bolt holes 313 penetrating the front and back are formed at both side portions removed from the groove. Perforated.
[0009]
The holding bodies 32a and 32b are stacked on the upper and lower sides (front and back) of the intermediate body 31, and are respectively formed with grooves 321a and 321b facing the grooves 311 and 312 and bolt holes corresponding to the bolt holes 313. 322a and 322b are formed, and in particular, a holding recess 323 for holding bolts connected to the bolt hole 322a is provided on the outer surface of one holding body 32a. The holding bolt 33 is a U-shaped bolt corresponding to the concave portion 323 and the bolt holes 313, 322a, and 322b.
[0010]
The connecting fitting 3 is formed by connecting the crossing portions of the horizontal rope 1b and the vertical rope 1a forming a net body with grooves 311 and 321a and grooves 311 and 321b on the opposing surfaces of the intermediate body 31 and the holding bodies 32a and 32b. In the laminated state, the bolts 33 are passed through the bolt holes 313, 322a and 322b and the nuts 34 are screwed and tightened, and the ropes 1a and 1b at the crossing portions are connected to the intermediate body 31 and the holding body 32a. , 32b and connecting the rope crossing portions to form the whole in a net shape. In particular, since the rope crossing part is held with a constant holding force, when a force greater than the holding frictional force is applied, the holding part of the rope moves while maintaining a constant holding force. .
[0011]
The support column B is composed of a rope unit 4 and a support column 5, and the rope unit 4 includes a wire rope 41 having both ends of a ring-shaped grip and a turnbuckle 42 for fine adjustment of the length. The column 5 stands up on the base 52 with the cylindrical column main body 51 as a plane, and anchor bolts 53 are embedded on the slope side of the base 52 and connected to the anchor bolts 53 to connect the holding ropes 54 to the column main bodies 51. The cap 55 is crowned on the top of the column main body 51, and the holding rope 54 exposed from the cap 55 has the same structure as that of the connection fitting 3 and a rope holding portion when a certain level of tension is applied. The holding | maintenance metal fitting 56 which performs this movement is mounted | worn, and the column main body 51 is maintained upright.
[0012]
Further, as illustrated in FIG. 4, the buffer member 6 includes two gripping main bodies 61 a and 61 b, a gripping bolt 62, a nut 63, and a hook body 64. The holding main bodies 61a and 61b have a long groove shape and are formed with rope holding grooves 611 that are waved in the longitudinal direction and the plate thickness direction on one surface, and hook through holes (hook body connecting portions) 612 provided on both ends of the other surface. A part 613 is provided so as to protrude. Further, a receiving recess 614 of the holding bolt 62 is provided on the outer surface side of one holding body 61a, and a locking hook portion 615 is projected from the longitudinal end of the other holding body 61b. Bolt holes 616 are formed at both lateral ends corresponding to the receiving recesses 614.
[0013]
The holding bolt 62 is a U-shaped bolt corresponding to the receiving recess 614 and the bolt hole 616. The hook body 64 includes parallel insertion hook portions 641 that pass through the hook through holes 612 of the gripping main bodies 61a and 61b that face each other, and a connection U-shaped portion (hanging portion) 642 that connects the insertion hook portion 641. A screw part 643 is formed at the tip of the part 641, and a fastening nut 644 that is screwed into the screw part 643 is provided.
[0014]
In this buffer member 6, a rope is mounted in a rope holding groove 611 facing two holding main bodies 61, the rope is held by the holding bolt 62 and the nut 63, and the hook body 64 is connected to an appropriate portion. When a certain tension or more is applied to the rope, the rope is stretched in a state where the rope is held by the buffer metal fitting with a certain holding force.
[0015]
The lock anchor 7 includes a shaft portion 71 that is driven into and fixed to a rock, a hook portion 642 of the hook body 64 of the buffer member 6, a connecting portion 72 that connects the wire rope 41, and the connecting portion 72 is detached from the shaft portion 71. It consists of a fastening nut 73 that prevents this.
[0016]
Thus, in order to construct a rock fall protection work on the slope a with the above-described members, the support column B is constructed on the upper side of the range where the mesh body A is stretched, and the lock anchor 7 is placed on the left and right sides of the mesh body A and above the support column B. Is to be installed.
[0017]
That is, the lock anchor 7 is fixed to each predetermined location, and the support 5 is stood up at the specified location, the support 5 is supported by the rope portion 4, and the tip end portion of the vertical rope 1 a of the net A is connected to the buffer member 6. (Holded by the holding bodies 61a and 61b), the buffer member 6 is connected to the support column 5, and the distal end portion of the horizontal rope 1b is connected to the lock anchor 7 that is driven and fixed to the left and right of the protective slope via the buffer member 6. To do. An appropriate stopper is provided at each end of the rope 1.
[0018]
Further, the lower portion of the mesh body A is folded back to the inclined surface side to form a pocket portion b, and each tip portion of the vertical and horizontal ropes 1 constituting the pocket portion b is also connected to the lock anchor 7 via the buffer member 6.
[0019]
Thus, the slope a is covered with the net A having a large opening at the support column B and a skirt at the pocket b. Therefore, when the falling rock c occurs on the slope a, the falling rock c falls from the opening to the mesh body A and the space d of the slope a, and collides with the mesh body A during the fall or from the mesh body A. , The falling speed is reduced by the frictional force between the falling rock c and the collision target, and is held in the pocket portion b below the net A.
[0020]
In particular, the connection of the crossing portions of the vertical and horizontal ropes 1a and 1b of the mesh body A changes the cross connection position when an impact greater than the holding force of the connecting fitting 3 is applied, and the force applied to the crossing portion further increases the tension of the vertical and horizontal ropes 1a and 1b. As a result, the connecting portion with each buffer member 6 expands to absorb the impact force, and the space d is dropped along the slope A without breaking the mesh body A and without falling rock c, By holding in the pocket part c, the falling rock on the road surface is eliminated.
[0021]
Further, in particular, the embodiment employs a cylindrical column main body 51 as the structure of the column 5 of the column B, and stands the column main body 51 on a base 52 and passes a holding rope 54 through the column main body 51. Since the holding metal fitting 56 that moves the rope holding portion when a tension exceeding a certain level is applied, as shown in FIG. 11, when the falling rock c collides with the column main body 51, the collision portion becomes the column main body. If it is 51 upper part, if the holding rope holding | maintenance part of the holding | maintenance metal fitting 56 moves, a support | pillar will fall down and will absorb an impact force, and if it collides with the base part of the column main body 51 further, on the base 52 of the column main body 51 The standing position moves to absorb the impact force.
[0022]
In the above embodiment of the present invention, the lock anchor of the driving method is adopted for attaching the holding rope and the slope of the net body. However, any method can be used as long as the holding rope and the buffer member are fixed to the slope. It may be adopted.
[0023]
【The invention's effect】
As described above, the present invention adopts a cylindrical column main body as the structure of the column of the column part, and stands the column main body on the base, passes the holding rope through the column main body, and applies a certain level of tension. If the falling rock collides with the pillar body, if the collision part is the upper part of the pillar body, the holding rope holding part of the holding bracket will move. When the column falls down and absorbs the impact force, and further collides with the base part of the column body, the standing position on the base of the column body moves to absorb the impact force.
[Brief description of the drawings]
FIG. 1 is an overall front view of a net body according to an embodiment of the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is an explanatory diagram of the column portion.
FIG. 4 is an exploded perspective view of the buffer member.
FIG. 5 is an explanatory diagram of a use state of the buffer member.
FIG. 6 is an exploded perspective view of the connection fitting.
FIG. 7 is an explanatory diagram (plan view) of a usage state of the cross fitting.
FIG. 8 is an explanatory diagram of the use state of the cross fitting (front view).
FIG. 9 is an explanatory diagram of the behavior of the net body when the fall rocks occur (at the beginning of the fall).
FIG. 10 is an explanatory diagram of the behavior of a net body when the falling rock is generated (end of dropping).
FIG. 11 is an explanatory view of the column behavior when the falling rock occurs.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Vertical rope 1b Horizontal rope 2 Wire mesh 3 Connecting metal 31 Intermediate body 32 Holding body 33 Holding bolt 34 Nut 4 Rope part 41 Wire rope 42 Turnbuckle 5 Column 51 Column body 52 Base 53 Anchor bolt 54 Holding rope 55 Cap 56 Holding metal 6 Buffer member 61 Holding body 62 Holding bolt 63 Nut 64 Hook body 7 Lock anchor

Claims (1)

Standing on the base formed on the slope, a plurality of pillars that are arranged substantially horizontally on the slope, stand upright on the base, and the holding rope that is connected to the anchor fixed to the slope and exposed to the outside stands upright on the base It is characterized in that it is fitted with a holding bracket that moves the rope holding part when a tension of a certain level or more is applied at a place where it passes through the supporting pillar and is exposed outside the supporting pillar.
Falling rock protection prop.

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