WO2018069970A1

WO2018069970A1 - Permeation-type trapping structure

Info

Publication number: WO2018069970A1
Application number: PCT/JP2016/080132
Authority: WO
Inventors: 利充野村; 昭一井上; 智弘藤井; 陽一西田; 満明山本
Original assignee: 株式会社プロテックエンジニアリング
Priority date: 2016-10-11
Filing date: 2016-10-11
Publication date: 2018-04-19
Also published as: JP6579553B2; JPWO2018069970A1

Abstract

[Problem] To provide a permeation-type trapping structure that is capable of assuredly preventing scouring of a river bed 80 and erosion of a river bank 81 while preventing destruction of a sleeve net 40. [Solution] This permeation-type trapping structure is provided with a spillway net 20, and the sleeve net 40, wherein the mesh of the sleeve net 40 is finer than that of the spillway net 20.

Description

Transmission type capture structure

The present invention relates to a transmission type capture structure that can be used for debris flow, debris trapping such as driftwood, driftwood trapping in rivers, slope fall prevention, avalanche prevention, and the like.

A transmission type trapping structure using a trapping net formed in a lattice shape by crossing steel ropes such as wire ropes in the vertical and horizontal directions is known (Patent Document 1).
As a means of attaching the capture net, it is known to use anchors to fix the periphery of the capture net to the shore or to the valley (Patent Document 2), and to attach both sides of the capture net to the pillars standing on the valley. (Patent Document 3).
As shown in FIG. 14, not only a rectangular water passage net 91 is installed between the

support pillars

90, 90, but also a sleeve net 93 is additionally arranged between the support pillar 90 and the riverbank 92, It is also known to arrange

nets

91 and 93 in the cross section (Patent Document 3).
The sleeve net 93 is a net produced by crossing vertical ropes and horizontal ropes so as to have the same texture as the water passage net 91, and connecting the intersections. The hypotenuse of the net 93 is fixed to the valley 92.

JP 50-31604 A Japanese Patent Laid-Open No. 2000-257049 (FIG. 1) JP 2002-339338 A (FIG. 1)

The conventional transmission type capture structure has the following problems.
<1> In the transmission type trapping structure shown in FIG. 14, when the riverbank 92 remains bare, erosion of the riverbank 92 proceeds as shown by a two-dot chain line during a large-scale flood, and the transmission type trapping structure. The sabo function as an object is lost.
<2> It is possible to prevent the erosion by covering the shore 92 with an artificial revetment structure such as a concrete structure, but it becomes difficult to bring revetment materials and construction equipment to the mountain site, The revetment cost is very high.
<3> When both ends of each horizontal rope constituting the water passage portion net 91 are mounted between the

support columns

90, 90, it takes a lot of labor and time for the tension work of each horizontal rope. The work efficiency of installation work is low.
<4> The conventional capture net used in the transmission-type capture structure is such that the intersection of the capture net moves and the mesh easily expands / contracts at the time of impact, and the transmission of the impact load accompanying the displacement of the capture net There are problems such as a large loss and a tendency that stress is concentrated on the horizontal rope located in the receiving range with a narrow impact force diffusion range and breaks easily.

The present invention has been made in view of the above points, and an object thereof is to provide the following transmission type capturing structure.
<1> Ensure prevention of scouring of the bed and erosion of the shore while preventing destruction of the sleeve net during floods.
<2> There is no need to protect the surface of the shore with an artificial revetment structure, and the shore is protected economically.
<3> Dispersion performance of impact force by the water passage net is improved, the strength of the capture net can be maximized, and the buffer performance is improved.

The present invention relates to a water passage net that is laid between a plurality of rigid structures standing on a gorge at intervals, and a sleeve that is laid between a rigid structure at an end and a shore. A transmission type trapping structure comprising a net part, comprising a flow-down material deposited on the upstream surface of the sleeve net between the upstream bank of the sleeve net and the sleeve net. The mesh of the sleeve net is smaller than the mesh of the water passage net so that the protective buffer layer is formed in a state shape.
In another embodiment of the present invention, the mesh of the sleeve net is formed in the range of 10 to 95% of the mesh of the water passage net.
In another embodiment of the present invention, the water-permeable net is configured to be non-slidable between a net body having a plurality of end-attached ropes and both ends of a rope member having a length of at least twice the span of the rigid structure. A back-loop material having a double rope structure fixed in a loop shape, the end-attaching rope having an end ring at an end, and a back-loop material horizontally mounted on the valley side of the rigid structure Is anchored to the end ring of the terminal attachment rope, the capture net and the back loop material are connected, and the impact force acting on the net body is distributed to the back loop material via the terminal attachment rope. A continuous body of the terminal attachment rope and the back loop member is spanned between the peripheral surfaces of the plurality of rigid structures so that transmission is possible.
In another embodiment of the present invention, the net body is arranged at the intersection of the single rope with a plurality of single ropes having end rings at both ends, and can be connected to the end rings of the single rope with a pin type connection. A plurality of relay couplers are combined to form a net shape.
In another embodiment of the present invention, a plurality of laterally arranged single ropes constitutes a continuous transverse line via a relay connector, and a loop structure is exhibited by the lateral rope, the terminal attachment rope, and the capture net. .
In another embodiment of the present invention, the terminal attachment rope is constituted by the single line connected to the left and right sides of the net body via a relay connector.
In another embodiment of the present invention, a plurality of stoppers project from the circumferential surface of the rigid structure along the longitudinal direction of the rigid structure, and the end ring of the terminal attachment rope that is sheathed by the stopper The movable range is regulated to a certain range by the stopper.
In another embodiment of the present invention, the relay connector includes a plurality of detachable mooring pins, and is pivotally connected to the end ring of the single rope via the mooring pins.
In another embodiment of the present invention, the relay connector includes a pair of single plates disposed opposite to each other, and a plurality of mooring pins that can be inserted and removed between the single plates.
In another embodiment of the present invention, the sleeve net is composed of a frame rope and an inscribed net fixed to the frame rope.
In another embodiment of the present invention, the top of the sleeve net is formed higher than the top of the water passage net.

The present invention can achieve any one of the following effects.
<1> By making the mesh of the sleeve net smaller than the mesh of the water passage net, the sleeve net functions normally as a completely transmissive structure, and during floods, the sleeve net is made impermeable. On the other hand, only the water passage net can be functioned as a transmissive structure.
<2> It is possible to form a protective buffer layer on the upstream side of the sleeve net by utilizing the size difference between the sleeve net and the water passage net.
Since the protective buffer layer is naturally formed of sediments from the flowing-down, it is not necessary to protect the surface of the shore with an artificial revetment structure, and the shore can be economically protected.
<3> Since the protective buffer layer functions as a protective wall for the sleeve net and the riparian coast, the scouring of the valley and the erosion of the riparian coast can be reliably prevented while preventing the destruction of the sleeve net.
<4> When the water net is composed of the net body and the back loop material, the end loops of the end attachment rope that extend on both sides of the net body function as a moving pulley. A water-permeable net can be stretched between a plurality of rigid structures by a simple operation of repeating the operation of pulling the material with a small force.

Model diagram of transmission type capture structure as seen from valley mountain side according to Example 1 Top view of transmissive capture structure Perspective view of a transmission type capture structure with a part omitted Net assembly exploded view Enlarged front view of the net without some parts Single rope perspective view Disassembled assembly drawing of relay connector Partial enlarged sectional view of the connecting part of the single rope and the relay connector Perspective view of mooring part of terminal mounting rope and back loop material It is explanatory drawing of the attachment part of a sleeve part net and a rigid structure, (A) is a fragmentary perspective view in the upper attachment part of a sleeve part net and a rigid structure, (B) is the bottom attachment of a sleeve part net and a rigid structure Partial perspective view of the part Top view of transmission type capture structure for explaining sabo function Partial front view of capture net according to Embodiment 2 The partial front view of the other capture net concerning Example 2 Model of a conventional transmission type capture structure

[Example 1]
<1> Outline of Transmission-type Capture Structure A transmission-type capture structure 10 according to this embodiment will be described with reference to FIGS.
The transmission-type capturing structure 10 includes a water passage net 20 laid between a plurality of

rigid structures

30, 30 erected on the valley 80 with an interval, each rigid structure 30, and a riverbank 81. The

sleeve nets

40, 40 are provided horizontally between the two.
The mesh size of the sleeve net 40 is smaller than the mesh size of the water passage portion net 20, and the top end height of the sleeve portion net 40 is formed higher than the top end of the water passage portion net 20.

<2> Watering portion net The watering portion net 20 is a single rope, a single chain, a strip-shaped steel plate made of metal, fiber, or resin, or a combination of a plurality of these, a square, a circle, or an ellipse. A known net-like material knitted in a mesh of a shape is included, and both left and right sides of the net are fixedly supported by the rigid structure 30.

The water passage net 20 of this example will be described with reference to FIGS.
The water passage portion net 20 of the present example has a net-like main body 25 having a plurality of terminal attachment ropes 26 extended to the left and right sides of the net, and the net main body 25 having a rigid structure via the plurality of terminal attachment ropes 26. And a back loop member 60 attached between the

bodies

30 and 30.
The net body 25 is disposed on the canyon side of the

rigid structures

30, 30, and the back loop member 60 is disposed on the canyon side of the

rigid structures

30, 30.

In this example, the net body 25 and the terminal attachment rope 26 are a plurality of single ropes 22 having

end rings

21 and 21 that are endless at both ends, and a plurality of relay connectors that can be connected to the ends of the plurality of single ropes 22. The case where 50 is comprised combining is demonstrated.

<2.1> Net Body The net body 25 of this example will be described. The net body 25 has a plurality of single ropes 22 arranged in the vertical direction and the horizontal direction, and a relay connector 50 is interposed at the intersection of the single ropes 22. It is a net-like object assembled.
The plurality of single ropes 22 arranged in the lateral direction are located on the same line via the relay connector 50 and constitute a continuous horizontal rope 23.
The plurality of single cords 22 arranged in the vertical direction are located on the same line via the relay connector 50 and constitute a continuous longitudinal cord 24.
The plurality of lateral cords 23 and the plurality of longitudinal cords 24 are crossed and assembled in a lattice shape.
In the net body 25, a square mesh A surrounded by four single ropes 22 arranged in the vertical and horizontal directions and four relay couplings 50 is defined.

<2.1.1> Single rope The single rope 22 is a combined rope material constituting the net body 25 and the terminal attachment rope 26.
Referring to FIG. 6, the single rope 22 is made of a steel or fiber rope in which one or a plurality of strands are twisted, and has endless rings 21 at both ends thereof.
As the net body 25, a high-strength steel rope material is used for the single rope 22, and both ends of the steel rope material are folded back and subjected to ice price or compression to form the end ring 21.

<2.1.2> Relay connector The relay connector 50 is a connector for detachably connecting the plurality of single cords 22.
The relay connector 50 illustrated in FIGS. 7 and 8 will be described. The relay connector 50 includes a pair of

single plates

51 and 51 arranged opposite to each other and a plurality of mooring pins inserted between the

single plates

51 and 51. 52.
A plurality of pin holes 53 into which the mooring pins 52 can be inserted are formed at the periphery of each single plate 31.
Although the present embodiment shows a form in which four pin holes 53 are formed at equal intervals, the number of pin holes 53 formed can be selected as appropriate.
As the anchoring pin 52, a connecting pin can be used in addition to the illustrated bolt and nut.
The mooring pin 52 is inserted into the end ring 21 together with the pair of

single plates

51 and 51 so that the single cable 22 and the relay connector 50 can be connected in a pin structure, and the single cable 22 is connected to the relay connector 50. The mooring pin 52 can be turned around.

<2.2> Example of assembly of capture net As shown in FIGS. 4 and 5, a plurality of single ropes 22 are arranged in the vertical and horizontal directions, and a relay-like connector 50 is interposed at the intersection of each single rope 22 to form a belt-like net. The main body 25 is assembled.
The reason why the relay coupler 50 is interposed at the intersection of the single cords 22 is to eliminate the shift movement of the intersection points of the single ropes 22. Load transmission between the connected single ropes 22 is possible, and load transmission loss is reduced.

One end of the plurality of single ropes 22 is connected to the left and right sides of the net body 25 via the relay connector 50, and the terminal attachment ropes 26 are assembled in multiple stages.
In addition to being able to assemble the net body 25 as a whole at the factory, it is also possible to divide the divided body of the net body 25 into the site and carry it into the site for assembly.

<2.3> Terminal Attachment Rope The terminal attachment rope 26 is a rope member made of single rope 22 provided on the left and right sides of the net body 25 and functions to attach the net body 25 to the rigid structure 30.
The plurality of terminal attachment ropes 26 are located on an extension line of the transverse cord 23 constituting the net body 25 via the relay connector 50.
The connection structure between the terminal attachment rope 26 and the net body 25 is the same as the connection structure using the relay connector 50 shown in FIG.

<2.4> Back Loop Material Referring to FIGS. 2 and 3, the back loop material 60 is a rope for horizontally laying the net body 25 between the

rigid structures

30 and 30 via the terminal attachment rope 26. It is a material and has a length more than twice the span of the

rigid structures

30, 30.
The back loop member 60 is passed through one rope member across the end rings 21 of the end attachment ropes 26 on both the left and right sides, and the overlapping portion near the end portion of the rope member cannot be slid by the fixture 61. And is formed in a loop shape.

<2.4.1> Relationship between the net body and the back loop member The transverse cords 23 constituting the net body 25 are located on the same line via the plurality of single ropes 22 and the relay connector 50 arranged in the lateral direction. The terminal attachment ropes 26 extend from both ends.
Since the back surface loop member 60 is stretched between the

terminal attachment ropes

26, 26, the entire loop loop structure having a continuity through the lateral cable 23, the terminal attachment rope 26, and the water passage portion net 20 is exhibited.

<2.4.2> Reason for combining the terminal attachment rope and the back loop material The back loop material 60 is moored to the end rings 21 and 21 of the

terminal attachment ropes

26 and 26 extending from the left and right sides of the water passage portion net 20. The end of the end-attachment rope 26 on the free end side 21 functions as a moving pulley, and the rear loop member 60 is pulled in the contraction direction with a small force, so that the adjacent rigid structures 30, This is because the water passage portion net 20 is stretched between 30 and the impact load is distributed to the net body 25 and the back surface loop member 60.

<3> Rigid Structure The rigid structure 30 is a highly rigid columnar structure that supports the water passage portion net 20, and in this example, the case where the rigid structure 30 is a column having a circular cross section will be described.

<3.1> Material Example of Rigid Structure The rigid structure 30 is a high-rigidity column such as a steel pipe, a concrete-filled steel pipe, or a concrete column, and is erected on the valley with a predetermined interval.

<3.2> Stopper As shown in an enlarged view in FIG. 9, a plurality of stoppers 31 protrude from the outer periphery of the rigid structure 30 according to the mounting height of the terminal mounting rope 26. The stopper 31 functions to cover the end ring 21 on the free end side of each end attachment rope 26 and restrict the movable range of the end ring 21 (the amount of movement of the end attachment rope 26) within a certain range.

In this example, the stopper 31 is formed on the outermost surface of the rigid structure 30. The stopper 31 is provided on the front side of the rigid structure 30 (installation of the net body 25). From the side) to the back side of the rigid structure 30 (the installation side of the back loop member 60).

<4> Sleeve Net 40 The sleeve net 40 is a net-like object having a mesh smaller than the water passage net 20.
In this example, the sleeve net 40 has a substantially triangular or substantially trapezoidal frame rope 41 and a plurality of rope members intersected in the frame rope 41 in the vertical and horizontal directions, and the intersections are fixed and formed in a lattice shape. The case where it comprises with the inscribed net 42 is demonstrated.
The inscribed net 42 is integrally fixed to the frame rope 41.

Referring to FIG. 10, an example of attaching the sleeve net 40 and the rigid structure 30 will be described. Brackets 32 project from the upper and lower portions of the side surfaces of the rigid structure 30, Side frame ropes 41 are attached to the upper and lower portions of the rigid structure 30 via stop pins 33.
The hypotenuse of the sleeve net 40 is fixed to the bank 81 via one or more anchors 82 shown in FIG.

<5> Relationship Between Mesh Sizes of Watering Portion Net and Sleeve Netting In the present invention, the mesh size of the sleeve net 40 is set to be smaller than the mesh size of the watering portion net 20.
The reason why the mesh size of the sleeve net 40 is made small is to allow the sleeve net 40 to actively catch the fallen material such as debris flow while allowing the water passage net 20 to pass through in the event of a large-scale flood. This is because the protective buffer layer 70, which is a deposit of falling material, is formed on the upstream side of the sleeve net 40.
In other words, it is to improve the capture performance of the sleeve net 40 compared to the water passage net 20, and to clog the sleeve net 40 side in advance.

<6> Mesh of water passing portion net and sleeve net The mesh size of the water passing portion net 20 is set to 1.5 to 2.0, which is the maximum diameter of boulders.
The mesh size of the sleeve net 40 is formed in the range of 10 to 95% with respect to the mesh size of the water passage net 20, and is preferably 50 cm or less.
If the mesh size of the sleeve net 40 with respect to the water passage net 20 is smaller than 10%, the impact load becomes enormous when the large-scale flood occurs, and the sleeve net 40 is easily damaged. It is difficult to form the protective buffer layer 70 on the upstream side of 40.

[Construction method of transmission type capture structure]
Next, a construction method of the transmission type capturing structure 10 will be described.

<1> Standing Up of Rigid Structure As shown in FIGS. 1 and 2, the

rigid structures

30 and 30 are set up on a valley or the like at a predetermined interval.
The net body 25 is carried into the valley mountain side of the

rigid structures

30, 30, and the rope material for the back loop member 60 is carried into the valley side of the

rigid structures

30, 30.

<2> Attaching the water passage portion net As shown in FIG. 2, each portion extended from both sides of the net body 25 while winding a portion of the rope material for the back loop member 60 around the circumferential surface of the rigid structure 30. The terminal attachment rope 26 is inserted through the end ring 21 at the free end and folded.
At this time, the end rings 21 of the terminal attachment ropes 26 are externally mounted on the corresponding stoppers 31 (FIG. 9).
In this state, both ends of the rope material for the back loop member 60 folded back on the back side of the rigid structure 30 are tightened in the contraction direction. By pulling the pair of left and right terminal attachment ropes 26 wound around the peripheral surface of the rigid structure 30 via the back loop member 60, the net body 25 is horizontally mounted on the front side of the

rigid structures

30 and 30.
The back loop member 60 fixes the overlapped portion of the rope member with a fixture 61 so as not to slide.

Since the end ring 21 on the free end side of each terminal mounting rope 26 functions as a moving pulley when the water passage portion net 20 is installed, the adjacent rigid structures can be easily assembled by pulling the back loop member 60 with a small force. The net body 25 can be stretched between 30 and 30. Therefore, a traction equipment such as a large chain block is not required for the installation of the net body 25, and the workability and the construction period can be greatly reduced by improving the workability of assembling the water passage net 20.

<3> Attaching the Sleeve Net 10 In parallel with the attaching operation of the water passage net 20, or by attaching the sleeve net 40 between the rigid structure 30 and the riparian 81 alone, the transmission type capturing structure 10 Is completed.

[Sandproof function of capture net]
Next, the sabo function of the transmission type capturing structure 10 will be described.

<1> At the time of medium and small scale floods In the case of medium and small scale floods, gravel, mud, etc. of a size that does not cause a disaster flow through the lower nets of the water passing portion net 20 and the sleeve net 40.

<2> At the time of large-scale flooding With reference to FIG. 11, the sabo function at the time of occurrence of a large-scale debris flow will be described.
Flowing objects such as debris flow and driftwood flow downward from the bottom of the drawing.
Since the mesh of the sleeve net 40 is smaller than the mesh of the water passage net 20, the sleeve net 40 is clogged and its transmission function is lowered.
In the water passage portion net 20 having a large mesh size and hardly clogging, a good transmission function is maintained.

<2.1> Formation of Protective Buffer Layer When clogging of the sleeve net 40 occurs, the amount of trapped and accumulated sediment increases, and the impervious protection by the falling sediment deposited on the valley mountain side of the sleeve net 40 A buffer layer 70 is formed.
The protective buffer layer 70 increases the amount of accumulation in the form of “state” toward the valley mountain side of the sleeve net 40 while protecting the both

banks

81, 81 located on the valley mountain side of the sleeve net 40. .
The height and width dimension of the protective buffer layer 70 is the largest on the side close to the sleeve net 40 and gradually decreases as the distance from the sleeve net 40 increases.
As the time passes, the protective buffer layer 70 becomes clogged with fine earth and sand in the gaps between the stones and changes into a hard and heavy mass structure.
The protective buffer layer 70 that has been transformed into a clod structure exhibits a function equivalent to that of a gravity concrete dam.

<2.2> Prevention of erosion on the shoreline Since the protective buffer layers 70 and 70 function as a protective wall, not only the sleeve net 40 is not destroyed, but also scouring and erosion of the

shorelines

81 and 81 are ensured. Can be prevented.
Since the protective buffer layers 70 and 70 are naturally formed with sediments from the flowing-down, it is necessary to protect the surface with an artificial revetment structure even if the

riverbanks

81 and 81 are bare. The

bank

81, 81 can be protected economically.
The skirts of the protective buffer layers 70, 70 extend not only to the valley 80 upstream of the sleeve net 40 but also to the valley 80 upstream of the water passage net 20. Therefore, scouring of the entire valley 80 on the upstream side of the transmission type capturing structure 10 can be effectively prevented.

<2.3> Absorption of Impact Force A protective buffer layer 70 is located upstream of the sleeve net 40 to protect the sleeve net 40.
When the subsequent falling material toward the sleeve net 40 strikes the side surface of the protective buffer layer 70, the flowing energy is attenuated by the buffering action of the protective buffer layer 70.

<2.4> Guidance of Flowing Material The subsequent flowing material that hits the protective buffer layer 70 flows down along the inclined side surface of the protective buffer layer 70 and is directed toward the water passage portion net 20.
Further, since the top end of the water passage net 20 is lower than the top end of the sleeve net 40, the falling material is guided toward the water passage portion net 20 by this height difference.

<2.5> Sabo by netting part net The netting part net 20 can catch downflows such as driftwood and debris that are larger than the mesh, and allow sediments such as debris that are smaller than the net that can pass through to flow out. .

<3> Other Actions of Watering Portion Net The watering portion net 20 of this example exhibits the following actions in addition to the above.

<3.1> Suppression of network expansion deformation In the conventional trapping net, the intersection of the ropes has shifted and the mesh has expanded, but in the net body 25, the intersection of each single cord 22 is fixed so that it cannot slide. Therefore, the mesh A is not expanded and deformed, and an excessively large falling material is not inadvertently discharged, so that the trapping function of the falling material can be guaranteed.

<3.2> Diffusion of impact force In the conventional catching net, the crossing point of the steel rope shifts, so the diffusion range of the impact force is narrow, and stress concentrates on the lateral rope located in the receiving range and easily breaks. It was a thing.
On the other hand, the net body 25 has a structure in which the intersection of the single cords 22 does not move and the single cord 22 can freely rotate at the intersection of the single cords 22 via the relay connector 50.
Therefore, since the impact load can be distributed and transmitted to all the single cords 22 connected to the relay connector 50, the transmission loss can be extremely reduced, and the impact force acting on a part of the water passage portion net 20 can be reduced. It can be transmitted to the entire net, and the strength inherent to the water passage net 20 can be maximized.
For example, when an impact force acts on the center portion of the net body 25 shown in FIG. 5, the impact force is transmitted in a chain manner to each single cord 22 located around the center portion of the net body 25 as indicated by an arrow. Go.

<3.3> Impact Force Transmission Path In this example, the impact force acting on the water passage net 20 is supported by the net body 25, the back loop member 60, and the rigid structure 30 described in detail below.

<3.3.1> Shock absorbing action of the net body and the back loop material The net body 25 and the back loop material 60 are slidable between the pair of

rigid structures

30 and 30 with continuity. It is wrapped around.
When a falling object such as a debris flow collides with the net body 25, the impact force is transmitted to the rear loop member 60 on the valley side via the

terminal attachment ropes

26 and 30.
The tensile force of the back loop member 60 increases as the net body 25 is bent and deformed toward the valley and valley side.
The net body 25 and the back surface loop member 60 do not include a shock absorber, but the impact force can be buffered by the elongation of the rope member.

When a frictional sliding type shock absorber is interposed in a part of the transmission type capturing structure, an impact force such as a debris flow repeatedly acts, so that a continuous shock absorbing action cannot be expected for the shock absorber.
On the other hand, in the transmission type capturing structure 10, the impact force can be buffered by elastic deformation by the net body 25 and expansion / contraction of the back loop member 60.

Since the back surface loop member 60 has a double rope structure, the impact load caused by the back surface loop member 60 is reduced.
Therefore, the back loop member 60 can be handled by a low-strength small-diameter rope member, and the fixture 61 can be handled by a small one.

<3.3.2> Transmission of impact force by the stopper When a huge impact force acts on the water passage portion net 20, the end attachment rope 26 wound around the rigid structure 30 is slightly slid by the extension of the back loop member 60. To do.
When the tip of the end ring 21 of the terminal attachment rope 26 shown in FIG. 9 comes into contact with the stopper 31 as the terminal attachment rope 26 slides, the sliding of the terminal attachment rope 26 is restricted.
Therefore, the impact force acting on the net body 25 is transmitted to the rigid structure 30 through the stopper 31 as bending force and rotational force.
The impact force that finally acts on the net body 25 is supported by the bending strength and rotational strength of the rigid structure 30.
By adding the rigid structure 30 to the support member having the impact force, the load burden on the back surface loop member 60 is reduced.
Even if the back loop member 60 breaks, the net body 25 and the rigid structure 30 can continue to support the impact force, so that the safety of the transmissive capturing structure 10 is significantly increased compared to the conventional case.

<4> Removal of trapped spilled material The spilled material such as a debris flow and driftwood trapped and accumulated in the water passage net 20 and the sleeve net 40 of the transmission type trapping structure 10 is removed by a known means.
When the flow-through is removed and the external force is removed, the net body 25 and the back surface loop member 60 constituting the water passing portion net 20 are restored to the original shape before the impact by the self-restoring force. There is no need to fix it.

<5> Repair of capture net When a part of the net body 25 of the water passage net 20 is damaged, only the damaged single rope 22 is removed from the relay connector 50 without replacing the entire net body 25. It can be replaced with a new one, and when the relay connector 50 is damaged, it can be easily replaced and repaired.

[Example 2]
A net body 25 constituting another water passage net 20 will be described with reference to FIGS.
In the previous embodiment, a configuration was described in which a plurality of single ropes 22 are arranged so as to intersect in the vertical and horizontal directions, and the net main body 25 is configured by interposing a relay connector 50 at the intersection. May be assembled by crossing them diagonally.
FIG. 12 shows a form in which a diamond-shaped mesh A is formed by crossing a plurality of single ropes 22 in an oblique direction except for the upper and lower sides and the left and right sides of the net body 25.
FIG. 13 shows a form in which a triangular mesh A is formed by intersecting a plurality of single ropes 22 arranged in the lateral direction and single ropes 22 arranged in an oblique crossing direction.
The net body 25 shown in FIG. 13 may be rotated 90 degrees.
Further, the water passage net 20 may be assembled by hierarchically combining the forms of the plurality of net bodies 25 shown in FIGS.
Although illustration is omitted, in any form, a plurality of terminal attachment ropes 26 are attached to the left and right sides of the net body 25, and the net body 25 and the back loop member 60 are continuous through the terminal attachment ropes 26. It is the same structure as Example 1 mentioned above that it is connected so that it may have.

In this example, by changing the number of single ropes 22 connected to each relay connector 50, the shape of the mesh A in the net body 25 can be any geometric shape excluding a circle (triangle, square). The strength of the net body 25 can be changed.
Further, by combining a plurality of single ropes 22 and a plurality of relay connectors 50, the contour shape of the net body 25 can be assembled into an arbitrary shape.

Further, the net body 25 may be a known net having a grid-like mesh in which continuous ropes are crossed and the crossing portion is fixed with clips.

DESCRIPTION OF SYMBOLS 10 ... Transmission type capture structure 20 ... Water passage part net 21 ... End ring 22 ... Single rope 23 ... Transverse rope 24 ...・ Vertical cord 25 ... Net body 26 ... Terminal attachment rope 30 ... Rigid structure (support)
31 ... Stopper 40 ... Sleeve net 41 ... Frame rope 42 ... Inscribed net 50 ... Relay connector 51 ... Single plate 52 ... mooring pin 60 ... back loop material 61 ... fixture 70 ... protective buffer layer 80 ... valley 81 ... valley 82: Anchor

Claims

A water passage net stretched between a plurality of rigid structures erected on the canyon at intervals, and a sleeve net stretched between the rigid structure at the end and the shore. A transmissive capture structure comprising:
The sleeve is formed in a state-like shape on the upstream surface of the sleeve net so as to form a protective buffer layer formed of a falling material deposited between the upstream bank of the sleeve net and the sleeve net. The mesh of the part net has a smaller dimensional relationship than the mesh of the water passage part net,
Transmission type capture structure.
The transmission type capturing structure according to claim 1, wherein the mesh of the sleeve net is formed in a range of 10 to 95% of the mesh of the water passage net.
The water net is a net body having a plurality of terminal attachment ropes,
A back loop material of a double rope structure formed in a loop shape by fixing both ends of a rope material having a length more than twice the span of the rigid structure so as not to slide;
The terminal attachment rope has an end ring at an end,
The back loop material laid on the valley side of the rigid structure is moored to the end ring of the terminal attachment rope, and the capture net and the back loop material are connected,
The continuous body of the terminal mounting rope and the back loop material is formed around the plurality of rigid structures so that the impact force applied to the net body can be distributed and transmitted to the back loop material via the terminal mounting rope. The transmission type capturing structure according to claim 1, wherein the transmission type capturing structure is stretched between surfaces.
The net body includes a plurality of single ropes having end rings at both ends of the net body, and a plurality of relay connectors arranged at intersections of the single ropes and capable of being pin-connected to the end rings of the single ropes. The transmission type capturing structure according to claim 3, wherein the transmission type capturing structure is combined to form a net shape.
The plurality of laterally arranged single ropes constitute a continuous transverse line through a relay connector, and the looped line is formed by the lateral line, the terminal attachment rope, and the capture net. The transmission type capture structure as described.
The transmission type capturing structure according to claim 3, wherein the terminal attachment rope is constituted by the single rope connected to the left and right sides of the net body via a relay coupling tool.
A plurality of stoppers project from the peripheral surface of the rigid structure along the longitudinal direction of the rigid structure, and the movable range of the end ring of the terminal mounting rope that is sheathed by the stopper is within a certain range by the stopper. The transmission type trapping structure according to claim 3 or 6, wherein
7. The relay connector according to any one of claims 3 to 6, further comprising a plurality of detachable mooring pins that are pivotably coupled to the end ring of the single rope via the mooring pins. The capture net according to one item.
7. The relay connector according to claim 3, further comprising: a pair of single plates arranged opposite to each other, and a plurality of mooring pins that are inserted between the single plates and can be attached and detached. The capture net according to one item.
The capture net according to claim 1 or 2, wherein the sleeve net is constituted by a frame rope and an inscribed net fixed to the frame rope.
The transmission type capturing structure according to claim 1 or 2, wherein the top end height of the sleeve net is higher than the top end of the water passage net.