JP2003155725A - Streambed protection construction block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a freely bendable and flexible structure to protect a streambed by bending flexibly by following scouring and stabilizing a water pressure even if riverside is locally scoured by flowing water. SOLUTION: Blocks 5 with many connection wires composed by connecting unit blocks 1 such as a natural stone and an imitation stone concrete block with at least one end of the connection wire 2 are arranged like a cluster by linking respective connection wires 2 to a connection member 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to prevent scouring at a site that is easily scoured locally due to the flow of water, such as between a river structure such as a sabo dam, head drop construction, and belt construction and an existing river bed. Concerning the berth block.

[0002]

2. Description of the Related Art Materials used for river bank protection and bed protection include concrete blocks of various shapes, snake-baskets, wood-based materials, and a combination of them. For the purpose of preventing erosion of riverbanks and riverbeds, they secure unit weight so that they have a weight that will not be washed away by the flow of water, and form colonies by combining types to resist the river's scavenging force. .

Under the conditions of this premise, a porous structure is added so as to correspond to the revetment form in consideration of the ecosystem which is currently desired.

However, it is becoming clear that the river structure is not sufficient for the conservation and creation of the habitat of river organisms unless the river structure is adapted to the original mechanism of erosion, transportation and deposition. The disappearance of rivers and pools, which are indispensable for the habitat of benthic animals, was due to the function of conventional materials for flood control that led to the flattening of river beds.

FIG. 17 shows a conventional river revetment / bed protection work generally performed in the figure, where a is a seawall, b is a mooring, and c
Is a root guardian.

[0006]

Since the size of the foundation used as the above-mentioned floor protection is as large as about 1.0 to 4.0 m ^{2 in} the bottom area of a single body, it is locally affected by the turbulent flow at the time of flooding. Flexibility is difficult to exert against scouring.

Therefore, as shown in FIG. 18, when the riverbed on the bottom installation surface is eroded, a bog flow is also generated under the root anchor c of the floor guard, a lift force acts, and the drag force is offset to cancel the root. There is a possibility that a scouring recess d is formed on the lower side of the solid c to cause the flow and curling phenomenon of the bed protection, and this phenomenon may propagate to the entire bed protection, which adversely affects the entire river structure. It can happen.

The various mechanisms of rivers, which are indispensable for the conservation and creation of river ecosystems, can be achieved by the continuous manifestation of erosion, transportation, and sedimentation. Due to the progress, the supply of sediment from the upstream area decreased, so that only the bed material accumulated in the river is swept in the downstream area. As a result, bedrock formation is progressing and it is difficult to form various riverbeds.

[0009] Furthermore, the riverbed near the river structure is lowered, and steps are formed in the revetment work, head drop work, fishway work, etc., resulting in cavitation of the structure and movement obstacles of benthos such as fish. Has become.

On the other hand, since aquatic plants and animals use the voids of the river bed material as a habitat environment, there are various types of revetments and corridors having a porous function.

They resembled voids in existing river beds,
There are stuffed stone types in which stones are packed in a box-shaped frame, as well as planting types, stone-clad types, porous concrete types, snake basket types, and wood-based woodworking floor types.

However, since any of these types is regulated or fixed by a frame or the like, when the suspended sediment or fine sand suspended in water and flowing down fills the voids of the floor protection, the running water settles. It has been difficult to remove the accumulated soil and fine particles and maintain the voids.

[0013] If this state continues for a long time, the porous space will be closed and become a flat river bed, which will be a factor to hinder the maintenance of various waterside spaces for living things.

Further, from the economical point of view, natural stones such as cobblestone are used as the porous material. However, since the materials in the river are exhausted today, their use is also limited. For that reason, we are transferring from other production areas and constructing it, but this not only differs from the local river bed material,
It leads to environmental damage in other areas, and as a result from a total cost perspective, it is expensive.

The present invention has been made in view of the above, and has a flexible structure so that even if the riverbed is locally scourd by running water, the structure is flexed to flex the water pressure. It is an object of the present invention to provide a protection bed block that can be stabilized to protect the river bed.

[0016]

In order to achieve the above-mentioned object, a floor protection block according to the present invention comprises a large number of unit blocks such as natural stone or pseudo stone concrete blocks connected to at least one end of a connecting line. The blocks with connecting wires are arranged in a tuft by connecting the connecting wires to the connecting members.

In the above-mentioned floor protection block, unit blocks are connected to both ends of the connection line to form a block with a connection line, and a chain is used as a connection member, and each ring constituting the chain has a block with a connection line. The configuration is such that the connecting line is inserted.

Further, in the above-mentioned floor protection block,
Insert the connecting wire through the through hole drilled in the unit block, and fix the retaining member to the tip of this, or fix the rotating metal fitting to the unit block and connect the end of the connecting wire to this rotating metal fitting. A block with connecting lines was constructed.

[0019]

[Operation] A large number of blocks with connecting lines, which are formed by connecting unit blocks to the ends of the connecting lines, are connected in a tuft with a large degree of freedom to form a flexure-free floor protection block.
By installing this protection bed block on the riverbed, the blocks with connecting lines bend and fit well to the riverbed, and scour is prevented. Furthermore, this hoisting block properly controls the flow velocity, flow rate, and sediment movement of the river,
Conserve and create a habitat for plants.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a unit block such as a natural stone or pseudo stone concrete block. The unit block 1 is connected to both ends of a flexible connecting line 2 such as a wire to form a block 3 with a connecting line. A large number of sets of blocks 3 with connecting lines pass through the respective connecting lines 2 through the individual rings 4a of the chains 4, so that the blocks 3 with connecting lines are connected to the chains 4 in the shape of a tuft of grapes and are free to bend. It becomes Naiver Block 5. In addition, one or a plurality of connecting lines 2 may be passed through one ring 4a.

As shown in FIGS. 3 and 4, the unit block 1 and the connecting line 2 are connected by a hole 6 formed in the unit block 1.
This is done by passing the connecting wire 2 through the and fixing the anchor block 7 to the tip of this.

FIGS. 5 and 6 show a first other example of the connecting means for connecting the unit block 1 and the connecting line 2 with each other.
A rotary metal fitting 8 with an anchor is driven in and the end of the connecting wire 2 is fastened to this. Reference numeral 9 is a connecting metal fitting for joining together.

The size of the hoisting block 5 having the above structure can be appropriately changed by appropriately changing the number of the blocks 3 with connecting lines to be connected to the chains 4 to form a large group as shown in FIG. be able to.

And this protection bed block 5 is a riverbed 10
As shown in FIG. 9, each unit block 1 is restrained by the connecting line 2 and the chain 4 and can change its posture within the range of these degrees of freedom by being installed.

The above-mentioned floor protection block 5 may use a long chain 4 and a large number of sets of blocks 3 with connecting wires linked to each other to form a large group, but as shown in FIG. The floorwork block 5 may be made larger by connecting a plurality of each chain 4 with the shackle 11.

Next, a usage state of the floor protection block 5 having the above structure will be described with reference to FIGS. 11 to 16.

FIG. 11 and FIG. 12 show a state in which a plurality of floor protection blocks 5 are randomly installed along the flow. The flow of water in this case is as shown in FIG. 11, which is disturbed by each of the berthwork blocks 5 and diverted at the upstream side thereof, and at the same time, diverted and dispersed in all sides of the berthwork block 5. Flow pressure is relieved.

At this time, local scouring occurs due to the flow of water from the upstream side to both sides of each revetment block 5 to form a pool 12, and each revetment block 5
Sediment of the above-mentioned part 12 is accumulated on the downstream side of
You can At this time, the bobber block 5 bends following the deformation due to the local scouring on the upstream side, and the unit block 1 on the front side of the scouring faces the running water and resists it. It functions to stabilize the pore water pressure in the rear part and protect the riverbed on the bottom of the installation.

By utilizing this manifestation of the river bed protection function and randomly arranging the bed protection blocks 5, running water is obstructed by the bed protection blocks 5 and meanders, creating the pool 12 and the river 13 as described above. can do.

FIG. 13 and FIG. 14 show a state in which the protection bed block 5 is installed on the existing river bed 14. In this case, there is a head drop in the flowing water flowing through the bollard block 5, a pool 12 due to local scour is formed on the downstream side thereof, and a stream 13 is formed on the downstream side of the pool 12.

Also in this case, the bollard block 5 is freely deformed and fits into the existing river bed, so that the portion of the pool 12 is prevented from being scoured greatly.

Further, since the flowing water is dispersed and the pressure is relieved in each of the bobber blocks 5, the turbulent flow which causes the curling phenomenon is also dispersed and the lift is suppressed. This means that if the running water weakens, the fine sand will settle in the tufted tufting block 5, but the tufting block 5 is
Since it is a flexible structure that is flexible and flexible according to the flow regime that changes due to the occurrence of the ridge 13, some of the unit blocks 1 slightly move,
As a result, water is passed through the voids between the buried unit blocks 1 and the function of the buoy stone structure is maintained. This allows
The benthic habitat is maintained.

By applying this function, it becomes possible to form a grain size and distribution similar to the river phase for scour near the river structure, and between the unit blocks 1 in the surface layer for normal running water. At the time of flooding, sediments in the surface layer are washed away, but the pressure in the lower layer reduces the pressure of the flowing water, so that it is assimilated with the bed material without disturbing the existing bed. Stabilize.

FIGS. 15 and 16 show a case where the function of the floating structure is applied, showing a state in which the floor protection block 5 is installed on the downstream side of the drop structure 15 which is an existing structure.
The berth block 5 relaxes the flow from the dropwork 15, and flexibly deforms following the deformation of the riverbed to assimilate with the riverbed material and become stable. The scouring that occurs is prevented. In addition, in FIG. 15, 16 is a fishway work and 17 is a conventional bed protection work.

In this example of use, scouring that occurs at the lower end of the drop structure 15 is prevented.

In each of the above-mentioned embodiments, the floor protection block 5 is used.
The block 3 with the connecting line constituting the above shows an example in which two unit blocks 1 are connected by the connecting line 2, which is shown in FIG.
As in the second other example shown in FIG. 3, the unit block 1 is connected to only one end of the connecting line 2 to form a block 3a with a connecting line, and the connecting line connects the other end of the connecting line 2 of the block 3a. Four
It may be tied to the ring 4a.

The connecting wire 2 may be made of any material as long as it has flexibility, but it is preferable that the connecting wire 2 has durability such as antiseptic stainless wire. Further, the member for connecting the blocks with connecting lines 3 and 3a in a tuft is not limited to the chain 4 connecting the rings 4a, but a flexible rope is used, and the blocks with connecting lines 3, 3a are Connecting line 2
May be connected with a predetermined degree of freedom. A chain 4 connecting the blocks 3 and 3a with connecting lines
Of course, ropes and ropes having antiseptic properties are used.

Further, the lengths of the connecting lines 2 of the blocks 3 and 3a with connecting lines are made random so that the unit blocks 1 connected in a tufted manner to the floor protection block 5 are not uniformly arranged. , When it is installed on the river bed, it creates various porous spaces and is installed well with the local river bed material.

[0039]

EFFECTS OF THE INVENTION According to the present invention, a large number of unit blocks constituting a slab block are linked to each other in a tuft of grapes with an extremely high degree of freedom, so that a flexible and flexible structure is formed, which is used as a river bed. By arranging, even if the upstream side of the block is locally scoured by running water, the sabo block will bend and follow the deformation of the river bed, and the block in front of the scouring will face the running water and resist it. Therefore, the pore water pressure between each unit block of the berth protection block is stabilized and the riverbed at the bottom of the installation is protected.

By utilizing the manifestation of this function, by randomly arranging the berth block according to the present invention on the river bed, running water is obstructed by the berth block and meanders around the block. Fuchi and Sease are created.

Further, even when the riverbank is straightened or the riverbed is flattened by the river improvement, safety can be secured and various riverbeds can be formed by using the protection bed block according to the present invention.

Further, since natural stones and pseudo-stone concrete blocks are linked in a tuft of grapes, an extremely large number of porous spaces indispensable to the habitat of living beings are secured and a good habitat of living beings is provided. be able to.

Further, when it is installed on the riverbank, various watersides are formed, providing voids for plant survival and promoting sedimentation of soil and promoting plant growth.

Furthermore, when a drop occurs due to scouring on a river structure such as a head drop structure and an existing river bed, by laying down the floor protection block according to the present invention in this part,
This has the effect of fitting into the current riverbed and facilitating the maintenance and conservation of structures and the movement of benthic animals.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a floor protection block according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view showing an example of a block with a connecting wire and a linked state with a chain.

FIG. 4 is a perspective view showing an end portion of a connecting line.

FIG. 5 is a perspective view showing a state in which the block with a connecting wire is linked with a first other example and a chain.

FIG. 6 is a perspective view showing another example of the end portion of the connecting portion.

FIG. 7 is a perspective view showing a second modified example of the block with a connecting wire and a linked state with a chain.

FIG. 8 is a plan view showing a stacked state of the floor protection blocks.

FIG. 9 is a cross-sectional view showing a stacked state of a floor protection block.

FIG. 10 is a perspective view showing a state in which a plurality of hoisting blocks are linked.

FIG. 11 is a plan view showing a state in which a plurality of bollard blocks are installed on the riverbed.

12 is a sectional view taken along line BB of FIG.

FIG. 13 is a plan view showing a state where a hoisting block is installed on an inclined riverbank.

14 is a cross-sectional view taken along line CC of FIG.

FIG. 15 is a plan view showing a state where a hoisting block is installed at a scour site of an existing structure.

16 is a sectional view taken along line DD of FIG.

FIG. 17 is a cross-sectional view showing the structure of a conventional floor protection and foundation.

FIG. 18 is a cross-sectional view showing a scouring state in a conventional floor protection / root consolidation structure.

[Explanation of symbols]

1 ... Unit block, 2 ... Connecting line, 3, 3a ... Block with connecting line, 4 ... Chain, 4a ... Ring, 5 ... Floor protection block, 6
... holes, 7 ... anchor blocks, 8 ... rotating fittings, 9 ... connecting fittings, 10 ... river beds, 11 ... shackles, 12 ... buchi, 13 ...
River, 14 ... Sloping riverbed, 15 ... Heading, 16 ... Fishway, 17 ... Conventional bed protection.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Susumu Tsuchiya             3rd, Hachisenkan, 3rd, Sanbancho, Chiyoda-ku, Tokyo             Machi Foundation Riverfront Maintenance Center             Within (72) Inventor Kazuo Narita             4-2-8 Naeho-cho, Higashi-ku, Sapporo-shi, Hokkaido             O-N Kosho Co., Ltd. (72) Inventor Kunio Shindo             8-chome Minami Ichijo Nishi 1-chome, Chuo-ku, Sapporo-shi, Hokkaido               Kyowa Concrete Industry Co., Ltd. F-term (reference) 2D018 EA01

Claims (4)

[Claims] 1. A plurality of blocks with connecting wires, which are formed by connecting unit blocks such as natural stone or pseudo stone concrete blocks to at least one end of the connecting wires, are arranged in a tuft by connecting each connecting wire to a connecting member. A hobby block that has been characterized. 2. A unit block is connected to both ends of the connecting line to form a block with a connecting line, and a chain is used as a connecting member.
The floor protection block according to claim 1, wherein the connecting line of the block with the connecting line is inserted through each ring constituting the chain. 3. A block with a connecting wire is formed by inserting a connecting wire into a through hole formed in a unit block and fixing a retaining member to the tip of the connecting wire. The mentioned berth block. 4. A floor guard according to claim 1, wherein a rotary fitting is fixed to the unit block, and the end of the connecting wire is connected to the rotary fitting to form a block with a connecting wire. Work block.