JP6906263B1 - Transmissive capture structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmissive trapping structure capable of suppressing tilting of a strut without increasing the diameter of the strut while ensuring both strength and flexibility of a gap net. SOLUTION: A plurality of reinforcing horizontal ropes 40 are arranged across a valley, both ends of the plurality of reinforcing horizontal ropes 40 are connected to anchors 50 provided on the valley shore, and the plurality of reinforcing horizontal ropes 40 are connected to a gap net. It was arranged on the valley side of 30 and the intermediate portion of the plurality of reinforcing horizontal ropes was arranged on the side surface of the plurality of columns 10 on the valley side. [Selection diagram] Fig. 1

Description

The present invention relates to a permeation type trapping structure that can be used for debris flow, driftwood and other sediment trapping work, driftwood trapping work in rivers, slope rockfall prevention work, avalanche prevention work, landslide prevention work, and the like.

In Patent Document 1, a transmission type trapping structure using a trapping net formed by interlacing steel ropes such as wire ropes in the vertical and horizontal directions in a grid pattern is known.
Further, Patent Document 2 discloses a transmissive trapping structure in which a rectangular water passage net is installed between adjacent columns and separate gap nets are additionally arranged on the left and right sides of the water passage net. ing.
In this transmission type capture structure, a water passage net arranged along the crossing direction of the valley and a pair of left and right gap nets are arranged in a horizontal row so as to block the swamp space of the valley.

Further, Patent Document 3 discloses a transmission type trapping structure in which the mesh of the gap net is smaller than the mesh of the water passage net.
Explaining with reference to FIG. 7, by utilizing the dimensional difference between the meshes of the water passage net 20 and the gap net 30, the flow-down material can be deposited on the upstream side of the gap net 30 in the event of a flood. The gap net 30 functions as an opaque structure, and the water-permeable net 20 functions as a permeable structure.

Explaining the attachment structure of the gap net 30 disclosed in Patent Document 3, the gap net 30 has a frame rope 31 having a substantially triangular shape and a mesh shape provided integrally with the frame rope 31 inside the frame rope 31. It is a net body separated and independent from the water-through portion net 20 composed of the contact net 32.
Each gap net 30 is mounted coupled to the anchor 51 provided with two sides of the frame rope 31 which is disposed along the strut 10 and Kagan G ₁ to the support body and Kagan G ₁ strut 10.

Japanese Unexamined Patent Publication No. 50-31604 JP-A-2002-339338 (Fig. 1) Japanese Patent No. 65795553 (Fig. 1)

The conventional transmissive capture structure has the following problems.
<1> When a demonstration experiment was conducted with the transmissive capture structure described in Patent Document 3, the strength of the inscribed net 32 constituting the gap net 30 was found to be due to a huge load acting on the gap net 30. Need to be increased.
If the rope diameter of the inscribed net 32 is increased to increase the strength, the flexibility of the gap net 30 is impaired, and the catchability of the flowing object by the gap net 30 is deteriorated.
Since the catchability of the flowing object is greatly affected by the flexibility of the net, it is technically difficult to secure both the strength and the flexibility of the gap net 30.
<2> In order to increase the connection strength between the gap net 30, the support column 10 and the gap net 30, the number of connection points between the support column 10 and the frame rope 31 is increased to disperse the external force acting on the gap net 30. A method of supporting the support by the support column 10 can be considered, but if the number of connecting points between the support column main body and the frame rope 31 increases, the work man-hours increase and the workability deteriorates.
<3> High bending strength (bending strength) is required for the support column 10, but if the support column 10 body is designed to have a large diameter and high strength, not only the cost of the support column 10 will be high, but also the weight will be heavy and the site will be heavy. Carryability to is deteriorated.

The present invention has been made in view of the above points, and an object of the present invention is to provide the following transmission type trapping structure.
<1> It is possible to secure both the strength of the gap net and the flexibility.
<2> To improve workability by reducing the number of points connected to the columns.
<3> Suppress the tilt of the support without increasing the diameter of the support.

In the present invention, a plurality of stanchions erected on the valley floor at intervals, a water passage net laid between the plurality of stanchions, and an outermost stanchion and the valley shore are laid. A transmissive capture structure including a gap net, in which a plurality of reinforcing horizontal ropes having a total length capable of crossing the valley are arranged across the valley, and the plurality of reinforcing horizontal ropes are used in the valley of the gap net. It was placed on the valley side.
In another embodiment of the present invention, both ends of the plurality of reinforcing horizontal ropes may be connected to anchors provided on the shore.
In another embodiment of the present invention, the plurality of reinforcing horizontal ropes may be arranged on the side surface of at least one or more columns on the valley side.
In another embodiment of the present invention, the reinforcing lateral rope may be provided with a margin in advance so that the bending deformation of the gap net can be regulated within a certain range.
In another embodiment of the present invention, the plurality of reinforcing horizontal ropes are arranged in multiple stages with respect to the columns.
In another embodiment of the present invention, a strip-shaped net main body in which the water-through portion net is assembled in a grid pattern by crossing a plurality of vertical ropes and horizontal ropes, and a back rope to which the net main body is attached across a plurality of columns are provided. It is a loop structure provided, and the net main body is arranged on the valley side of the columns, and the back rope is arranged on the valley side of the columns and wound between a plurality of columns.
In another embodiment of the present invention, the gap net is composed of a frame rope and an inscribed net fixed to the frame rope.

The present invention has any one of the following effects.
<1> The proof stress of the gap net can be increased by the reinforcing action of the reinforced horizontal rope, and the flexibility of the gap net can be ensured by allowing the reinforced horizontal rope to have a margin in advance. The catchability of the rope is improved.
<2> In the present invention, the reinforcing horizontal rope is not connected to the support column but is simply arranged and moored on the valley side.
Therefore, the work of connecting the reinforcing horizontal rope and the support column becomes unnecessary, and the workability can be improved.
<3> Reinforcement By the reinforcing action of the horizontal rope, it is possible to suppress the tilting of a plurality of columns toward the valley side without increasing the diameter of the columns.
<4> The impact force acting on the gap net can be effectively damped by the elastic deformation of the gap net and the extension of the reinforcing horizontal rope.

Model diagram of the transmission type capture structure according to the present invention as seen from the valley mountain side Exploded view of the transmission type capture structure according to the present invention In the explanatory view of the water passage net, (A) is a perspective view of the water passage net, (B) is a perspective view of the mooring portion provided on the support column, and (C) is a perspective view of another mooring portion provided on the support column. Explanatory drawing of the mounting structure of the gap net It is a horizontal cross-sectional view of a transmission type trapping structure for explaining the arrangement form of the reinforced horizontal rope for a plurality of columns, (A) is a model view of the reinforced horizontal rope, and (B) is a water passage net and a gap net. Model diagram of It is a horizontal cross-sectional view of a transmission type trapping structure for explaining another arrangement form of a reinforced horizontal rope for a plurality of columns, (A) is a model view of a reinforced horizontal rope, and (B) is a water passage net and a gap. Model diagram of the department net Model diagram of the transmissive capture structure presupposed by the present invention

<1> Outline of the transmission type capture structure The transmission type capture structure according to the present embodiment will be described with reference to FIGS. 1 to 6.
Transmission capture structure with a plurality of struts 10 erected at intervals in the Keiyuka G _2, water passed through unit net 20 spanned between a plurality of struts 10, each strut 10 and Kagan G ₁ a gap nets 30 and 30 spanned between the multi-stage manner spanned across the outer peripheral surface side of the valley valley of the plurality of struts 10, connecting the anchor 50 provided with both end portions in Kagan G ₁ It is provided with a plurality of reinforcing horizontal ropes 40.

<2> Strut The strut 10 is a highly rigid columnar structure that supports the water passage net 20 and the gap net 30.
Strut 10, for example steel, concrete filled steel tube, a column of high rigidity, such as concrete pillars, is erected at a predetermined interval in Keiyuka G _2.

<2.1> Mooring portion and connecting portion of the support column The outer peripheral surface of the support column 10 has a mooring portion 11 for attaching the water-permeable portion net 20 and a connecting portion 12 for attaching the gap portion net 30.

<2.1.1> Mooring portion The mooring portion 11 for attaching the water passage portion net 20 is formed in pairs on the outer peripheral surfaces in front of and behind the support column 10.
The mooring portion 11 illustrated in FIG. 3 includes a pair of upper and lower brackets 11a and 11a projecting from the outer peripheral surface of the support column 10 and a mooring pin 11b vertically inserted between the pair of brackets 11a and 11a.
Although the flat plate-shaped bracket 11a is shown in FIG. 3 (B), the bracket 11a in which the flat plate is bent into a U shape as shown in FIG. 3C may be used.
A loop-shaped water passage net 20 can be wound and attached between the plurality of columns 10 via each of these mooring portions 11.

<2.1.2> Connecting portion The connecting portion 11 for attaching the gap net 30 is formed in the upper and lower parts of the outermost strut (terminal strut) 10.
Explaining the connecting portion 12 illustrated in FIG. 4, the connecting portion 12 is vertically formed between the pair of brackets 12a and 12a projecting from the upper and lower parts of the outermost column (terminal column) 10 and the pair of brackets 12a and 12a. It is provided with a stop pin 12b inserted in the direction.
Gap net 30 between the through each of these connecting portions 12 outermost end of the strut anchor 51 provided on the (terminal posts) 10 and Kagan G ₁ (see FIG. 6) is attachable.

<3> Water-draining part net The water-draining part net 20 is made of metal, fiber, or resin, any one of a single rope, a single chain, and a strip of steel plate, or a combination of these, and is square, circular, or elliptical. It is a known net-like material knitted into a mesh of the shape, and both the left and right sides of the net body are fixed to the columns 10.

The water passage net 20 illustrated in FIGS. 2 to 3 will be described.
The water-through portion net 20 is made of a high-strength steel rope material, and has a strip-shaped net main body 23 assembled in a grid pattern by crossing a plurality of vertical ropes 21 and horizontal ropes 22, and the net main body 23 is formed into a plurality of columns 10. It is provided with a rear rope 24 that is straddled and attached.
The net main body 23 arranged on the valley side of the support column 10 and the back rope 24 arranged on the valley side of the support column 10 are wound between the plurality of columns 10 in a continuous loop shape.
The intersections of the ropes 21 and 22 of the net body 23 are non-sliding.

The back rope 24 may be formed by extending the horizontal rope 22 of the net main body 23, or may be used by connecting the horizontal rope 22 and a separate rope material.
The back rope 24 located on the valley side of the support column 10 has its overlapping portion fixed by the fixture 25 so as not to be slidable.

In this example, the case where the water-through portion net 20 exhibits a loop structure will be described, but the water-through portion net 20 can also be applied to a non-loop structure (for example, a single net).

<4> Gap net The gap net 30 is a net-like material having a mesh equal to or smaller than the mesh size of the water passage net 20.
In this example, a frame rope 31 in which the gap net 30 surrounds a substantially triangular or substantially trapezoidal shape and a plurality of rope materials intersect in the frame rope 31 in the vertical and horizontal directions, and the intersections are fixed and formed in a grid pattern. It is composed of an inscribed net 32. The peripheral edge of the inscribed net 32 is integrally fixed to the frame rope 31.
The inscribed net 32 has slack in the vertical and horizontal directions, and is attached with the slack.

<5> Top height of the water passage net and the gap net The top height of the gap net 30 may be formed higher than the top of the water passage net 20 or may be formed at the same height. You may.
When the height of the top of the gap net 30 is formed higher than the height of the top of the water passage net 20, the flow-down object can be easily guided toward the water passage net 20 due to the height difference of the net.

<6> Reinforcing horizontal rope The reinforcing horizontal rope 40 is a rope material having both a reinforcing function of the gap net 30 and a reinforcing function of the support column 10.
Left and right end portions of the reinforcement horizontal rope 40 which is disposed in multiple stages at an interval to the transmission-type capture structure supports coupled to the anchor 50 provided on Kagan G _1.

The anchor 50 that supports the reinforcing horizontal rope 40 and the anchor that supports the hypotenuse of the gap net 30 may be provided individually or may be used in combination.

<6.1> Overall length of the reinforced lateral rope The overall length of the reinforced lateral rope 40 has a dimension longer than the dimension capable of crossing the transmissive trapping structure.
In other words, for attachment by servative between anchor 50 provided on RyoKeigan G _1, reinforcing horizontal rope 40 passes over across the gap net 30, 30 of the left and right sides, including water guiding part net 20 It has a total length that is the sum of the possible length and the length of the allowance.

<6.2> Reason for using as many as one rope for the reinforcing horizontal rope For example, as a method of reinforcing the gap net 30, a plurality of reinforcing horizontal ropes are used between the outermost support (terminal support) 10 and the shore G1. A method of mounting the 40 in multiple stages can be considered.
In this method, one end of the plurality of reinforcing horizontal ropes 40 must be connected to the outermost support (terminal support) 10, which increases the man-hours for connection work.
In the present invention, as many as one rope is used for the reinforcing horizontal rope 40 in order to reduce the man-hours for connecting the reinforcing horizontal rope 40 to the support column 10 and improve the workability.

<6.3> Arrangement position of the reinforcing horizontal rope The reinforcing horizontal rope 40 is located on the valley side of the plurality of columns 10.
The left and right ends of the reinforcing horizontal rope 40 are located on the valley side of the pair of left and right gap nets 30 and 30.
The reason why the reinforcing horizontal rope 40 is positioned on the valley side with respect to the support column 10 and the gap net 30 is that the load acting on the support column 10 and the gap net 30 is supported by the reinforcing horizontal rope 40, and the support column 10 is tilted. This is to suppress the above and to reinforce the gap net 30.

<6.4> Arrangement Form of Reinforcing Horizontal Rope for Supports When the reinforcing horizontal ropes 40 are located on the valley side of a plurality of columns 10, the reinforcing horizontal ropes 40 are arranged for the columns 10 with reference to FIGS. The form will be described.
In the explanation, in FIGS. 5 and 6, the arrangement form (A) of the reinforcing horizontal rope 40 for the plurality of columns 10 and the arrangement form (B) of both nets 20 and 30 are illustrated separately for easy understanding. Actually, the arrangement forms of (A) and (B) are combined.

In FIG. 5A, the intermediate portion 40a of the reinforced horizontal rope 40 is arranged on the valley side of the stanchion (intermediate stanchion) 10 excluding the outermost stanchion (terminal stanchion) 10, and both ends of the reinforced horizontal rope 40. The form in which the portions 40 and 40ba are arranged between the innermost column (intermediate column) 10 and the anchor 50 at the outermost end is shown.

In FIG. 6A, the intermediate portion 40a of the reinforcing horizontal rope 40 is arranged on the valley side of all the columns 10 including the outermost column (terminal column) 10, and the outermost column (terminal column) is arranged. The form in which both ends 40, 40ba of the reinforcing horizontal rope 40 are arranged between the 10 and the anchor 50 is shown.
The reinforcing horizontal rope 40 may have its intermediate portion 40a arranged on the side surface of at least one or more columns 10 on the valley side.

In any form, as shown in FIGS. 5 (B) and 6 (B), a loop-shaped water passage net is provided between all the columns 10 including the outermost column (terminal column) 10. 20 is installed, and a gap net 30 is arranged between the outermost support (terminal support) 10 and the anchor 50.

<6.5> Number of Reinforcing Horizontal Rope The number of reinforcing horizontal ropes 40 to be arranged is appropriately selected in consideration of the assumed impact energy in the transmission type trapping structure, the height dimension of the structure, and the like.

<6.6> Granting of pre-slack of the reinforced horizontal rope When the reinforced horizontal rope 40 is attached with high tension, the amount of deflection of the gap net 30 becomes small, and the catchability of the flow-down object by the gap net 30 becomes small. become worse.
Therefore, by attaching the reinforcing horizontal rope 40 with a margin in length so as to have some slack in advance, it is possible to allow a certain range of entanglement deformation of the gap net 30 while maintaining the reinforcing effect. It will be possible.
The initial slack to be introduced into the reinforced lateral rope 40 is appropriately selected in consideration of the assumed impact energy of the transmission type trapping structure, the flexibility of the gap net 30, and the like.

[Construction method of transmissive capture structure]
Next, a method of constructing the transmission type capture structure will be described.

<1> Erecting of columns As shown in FIGS. 1 and ₂ , the columns 10 are erected on the valley floor G2 or the like at predetermined intervals.

<2> to fix the both end portions of the reinforcement horizontal rope 40 disposed across the attachment valley reinforcing horizontal rope to the left and right of the anchor 50 of Kagan G _1.
At this time, the reinforcing horizontal rope 40 is positioned on the side surface of the plurality of columns 10 on the valley side, and the reinforcing horizontal rope 40 is provided with slack.

<3> Installation of the water passage net After the reinforcement horizontal rope 40 is installed, in parallel with the installation of the reinforcing horizontal rope 40, or prior to the installation of the reinforcing horizontal rope 40, a loop structure is formed between the plurality of columns 10. Attach the water passage net 20.
Finally, two types of ropes, a back rope 24 and a reinforcing horizontal rope 40, forming the water passage net 20 are positioned on the side surfaces of the plurality of columns 10 on the valley side.

<4> In parallel with the mounting operation of the gap net attachment water through unit net 20, or alone mounted in a state the gap net 30 which gave some slack between the strut 10 and the Kagan G ₁ Complete the transmissive capture structure. The gap net 30 is arranged on the valley mountain side of the reinforcing horizontal rope 40.

Explaining the mounting structure illustrated in FIG. 4, the frame rope 31 on the inner side of the gap net 30 is connected to the connecting portion 12 provided at the upper and lower parts of the outermost support (terminal support) 10, and the gap net is connected. the hypotenuse 30 is fixed to an anchor 51 provided in Kagan _{G 1} (see FIG. 6).
The anchor that fixes the hypotenuse of the gap net 30 can also be used as the anchor 50 to which the reinforcing horizontal rope 40 is attached.

<5> Relationship between the reinforced horizontal rope and the net The water passage net 20 and the gap net 30 are separated and independent of the reinforced horizontal rope 40. The reinforcing horizontal rope 40 is only located on the valley side of the gap net 30 and the support column 10, and the contact portions thereof are not integrally connected.

[Sabo function of over-type capture structure]
Next, the sabo function of the transmissive capture structure will be described.

<1> Small and medium-sized floods In the case of small- and medium-sized floods, gravel, muddy water, etc. of a size that does not cause a disaster flow down through the lower mesh of the water passage net 20 and the gap net 30.
In the case of small and medium-sized floods, the load load on the water passage net 20, the gap net 30, and the support column 10 can be small.

<2> Large-scale floods During large-scale floods, debris flows, driftwood, etc. are included in the flow-down objects, and some of these flow-down objects are captured by the water passage net 20 and the gap net 30.
By accumulating the flowing material on the gap net 30, the slackening of the reinforcing horizontal rope 40 disappears, and thereafter, the tension of the reinforcing horizontal rope 40 increases.

<2.1> Capturing of flowing objects by the gap net The reinforcing lateral rope 40 has slack before being hit, and the inscribed net 32 of the gap net 30 has slack.
Therefore, at the time of a large-scale flood, the gap net 30 is likely to be bent and deformed toward the valley side.
When the reinforcing horizontal rope 40 reaches the extension limit, the bending deformation of the gap net 30 is prevented.
As the gap net 30 bends and deforms appropriately toward the valley side, the flow-down object due to the gap net 30 is compared with the case where the gap net 30 is tensely attached without having slack in advance. The catchability is improved.

<2.2> Reinforcing action of the gap net by the reinforcing horizontal rope A plurality of reinforcing horizontal ropes 40 arranged on the valley side of the gap net 30 reinforce the gap net 30 from the valley side.
Therefore, since the tensile strength of the reinforcing horizontal rope 40 is added to the tensile strength of the gap net 30, the capture strength of the gap net 30 is increased.
In this way, the capture strength of the gap net 30 can be economically increased by additionally arranging the reinforcing horizontal rope 40 without increasing the rope diameter constituting the gap net 30.
In the transmission type trapping structure, the impact force can be effectively buffered by the elastic deformation by the gap net 30 and the extension of the reinforcing horizontal rope 40.

<2.3> Load distribution by the reinforced horizontal rope The impact force of the flowing object not only acts on the water passage portion 20, but also acts individually on the left and right gap nets 30 and 30.
The impact forces acting on the left and right gap nets 30 and 30 are not equal.
When the difference between the impact force acting on the left and right gap nets 30, 30 has occurred can also be dispersed and supported on the anchor 50 in which a plurality of reinforcing horizontal rope 40 is provided in Kagan G ₁ of the left and right to transfer loads ..

<2.4> Buffering action due to elastic deformation of the reinforcing horizontal rope In the transmissive capture structure, the impact force is absorbed by the elastic deformation of the gap net 30, but in addition to the elastic deformation of the gap net 30, the reinforcing horizontal rope 40 Since the elastic deformation of the above is added, the impact force acting on the gap net 30 can be effectively buffered.
In particular, since the amount of elastic deformation of the reinforcing horizontal rope 40 increases in proportion to the length of the gap net 30, the impact force absorption performance of the gap net 30 and the reinforcing horizontal rope 40 increases.
Therefore, the capturing strength of the gap net 30 can be increased by the reinforcing action of the reinforcing horizontal rope 40, and the flexibility of the gap net 30 can be ensured by providing the reinforcing horizontal rope 40 with a margin in advance.

<2.5> Supporting action of the support column by the reinforcing horizontal rope As the flowing object is captured, the load load on the water passage part net 20 increases, and at the same time, the load on the water passage part net 20 increases on the valley side with respect to the support column 10. It acts as a tilting force toward.
Since the tension of the reinforcing horizontal ropes 40 arranged on the valley side of the plurality of columns 10 is increased, the inclination of the support columns 10 toward the valley side is suppressed. In other words, to the valley side of the plurality of columns 10. tilting towards is supported on an anchor 50 provided on the reinforcement horizontal rope 40 and the left and right Kagan G _1.
In this way, it is possible to suppress the tilting of the plurality of columns 10 without increasing the diameter of the columns.

10 ・ ・ ・ ・ ・ Support 20 ・ ・ ・ ・ ・ Watering net 21 ・ ・ ・ ・ ・ Vertical rope 22 ・ ・ ・ Horizontal rope 23 ・ ・ ・ ・ ・ Net body 24 ・ ・ ・ ・ ・ Back rope 25・ ・ ・ ・ ・ Fixture 30 ・ ・ ・ ・ ・ Gap net 31 ・ ・ ・ ・ ・ Frame rope 32 ・ ・ ・ ・ ・ Inscribed net 40 ・ ・ ・ ・ ・ Reinforced horizontal rope 50 ・ ・ ・ ・ ・ Anchor G ₁・ ・ ・ ・_{・ Rope G 2}・ ・ ・ ・ ・ Rope floor

Claims (5)

A plurality of stanchions erected on the valley floor at intervals, a water passage net laid between the plurality of stanchions, and a gap net laid between the outermost stanchion and the shore. A transmissive capture structure comprising
A plurality of reinforced horizontal ropes having a total length capable of crossing the valley are arranged across the valley at a distance from the net body of the water passage net.
The plurality of reinforcing horizontal ropes are arranged on the valley side of at least one or more columns, and the plurality of reinforcing horizontal ropes are arranged on the valley side of the gap net.
Both ends of the plurality of reinforcing horizontal ropes are connected to anchors provided on the shore.
It is characterized in that the load acting on the support column and the gap net is supported by the reinforcing horizontal rope.
Transmissive capture structure. The transmissive trapping structure according to claim 1, wherein the reinforcing horizontal rope is provided with a margin in advance so that the bending deformation of the gap net can be regulated within a certain range. The transmissive capture structure according to claim 1 or 2 , wherein the plurality of reinforcing horizontal ropes are arranged in multiple stages with respect to the columns. The water passage net is a loop structure including a strip-shaped net main body assembled in a grid pattern by crossing a plurality of vertical ropes and horizontal ropes, and a back rope for attaching the net main body across a plurality of columns. The transmissive capture according to claim 1, wherein the net body is arranged on the valley mountain side of the columns, and the rear rope is arranged on the valley side of the columns and wound between the plurality of columns. Structure. The transmissive capture structure according to claim 1, wherein the gap net is composed of a frame rope and an inscribed net fixed to the frame rope.

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