KR101625827B1

KR101625827B1 - One unit multi-layer and porous structure for scour protection and constructing method thereof

Info

Publication number: KR101625827B1
Application number: KR1020150168530A
Authority: KR
Inventors: 안홍규; 김규호
Original assignee: 한국건설기술연구원
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2016-05-31

Abstract

The present invention relates to a method for constructing a river bed under a river crossing structure and a method for constructing the same, in order to prevent river bed scarring from occurring at the downstream end of an apron of a river crossing structure such as a dam installed in a river,
In the present invention, an integrated porous aggregate layer is constructed by combining an aggregate and a polyurethane material, a poultice providing a space where the flow of the water is restricted and a fish can be formed, and a sole structure for reducing the flow velocity between the puddle and the puddle. And a method for constructing the multi-layer porous bed protectors.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer multi-

[0001] The present invention relates to a river bed protection worker and a construction method thereof for preventing river erosion from occurring at the downstream end of a water basin formed downstream of a river crossing structure by flowing water, It is composed of an integral structure rather than a separate structure such as a block, a rock, or a gabbia. It does not separate and escape. It also suppresses bed erosion by first reducing water energy by the puddle, In addition to reducing the flow of the effluent by the pores between the aggregates, the effluent energy is further reduced, and the multi-layer structure prevents the bed from flowing out by the flowing water. In addition, It is possible to protect river crossing structure and protection of river bed at the same time by blocking Anse Oyster It is directed to a "one-piece multi-layer porous bed protection balls and construction method."

When a transversal structure such as a beam or a crosshead crossing in the width direction (transverse direction) is installed in a stream, a "scour phenomenon" occurs in the downstream of the transversal structure due to the flow of water. It is the "river bed protection" that is installed by the river protection structure to protect the river crossing structure from occurrence of the scour phenomenon, that is, erosion of the river bed.

The bed protectors are generally formed by laying stones, blocks, gabbros, ruffled mats, stone mats, etc. on the river bed downstream of the river crossing structures. Korean Patent Registration No. 10-0607234 discloses a conventional technique for forming a slag protection hole as an example of a bed protection hole and Korean Patent Registration No. 10-1426427 discloses a conventional technique for forming a bottom protection hole using a roll mat .

However, in the bed protection box according to the related art, the energy of the flowing water is directly transmitted to the bottom of the river (bed), so that the bed may be damaged, detached, or enveloped. When stones are installed for the protection of the bed, there is a problem that the stones are separated from each other or the mat-like shape is curled and rolled off.

On the other hand, in the case of a stacking structure, a gabion block, a shore block, and the like used in a floor guard according to the related art, there is no scouring at the surface of the bed, and the gravity, weight, In reality, the cause of the separation of such stones, gabbros, and shore blocks is the phenomenon of suction / loss of the bed material due to the vertical water flow. In the bottom part where the bottom protection hole is installed, there is a phenomenon in which the bed material is sucked and lost due to the power of the water. Such a sucking / loss phenomenon of the bed material eventually results in the enveloping, collapse, And thus acts as a threat to the safety of the transverse structure. When the outflow of the bed material (bottom soil body) occurs, the transverse structure is floating in the air with the interval from the bed, and when an external force such as flood occurs, due to the separation and envelopment of the transversal structure, The stability of the transverse structure itself is seriously threatened.

Also, in the case of the conventional art, if the bottom protection hole is damaged, a step having a large height difference from the transversal structure is generated, so that fish such as fish can not move to upstream and downstream, which adversely affects the river ecosystem. Particularly, according to the prior art, severe scouring may occur in the river bed, which causes a problem that the puddle, which is the habitat inhabited by the creatures, is damaged or deformed and the living space of the creature disappears and the ecological environment is deteriorated do. Excessive puddles in the lower part of the river crossing structure due to escape of the river protection reservoir or scouring of the river bed threaten the stability of the river crossing structure as well as the water damage in summer.

In addition, since the conventional technology was a defensive technique for preventing the absorption of water energy and not simply absorbing the energy, the destruction or dislocation of stones, gabbros, and blocks due to a large flood had a great effect on the safety of the transversal structure Therefore, in the prior art, sufficient stability can not be secured for the transversal structure.

Korean Patent No. 10-0607234 (2006. 08. 01. Announcement). Korean Registered Patent No. 10-1426427 (Announcement 2014. 08. 05).

The present invention has been developed in order to overcome the limitations of the prior art and solve the problems as described above. Specifically, it is an object of the present invention to prevent occurrence of bed erosion due to flowing water at the downstream end of a water- To thereby protect the lower river bed of the transversal structure, and a method of constructing the same.

Particularly, the present invention prevents the separation and separation of the material constituting the bed protection hole by forming a bed protection hole with an integral structure rather than a separate structure such as a block, a stone, and a gabion, To maintain a healthy river ecosystem while maintaining a healthy river ecosystem while suppressing river erosion by reducing water energy through a puddle during a flood and further reducing water flow through the porous structure to further reduce water energy, By effectively suppressing the leakage by the water force, it is possible to improve the dimensional stability, to suppress the loss and escape of the bed protection hole and to integrate the bed and the revetment so that the bed and the hoist oyster can be blocked at the same time, And the method of construction. The purpose of that ball.

In order to achieve the above object, according to the present invention, there is provided a floor guard and a method of constructing the same, the floor guard being installed on a lower surface in a longitudinal direction continuously to the lower end of a water- The second flow rate reduction puddle section, the third flow rate reduction section, the fourth flow rate reduction puddle section, and the fifth flow rate reduction section are sequentially formed; Secondary flow velocity reduction puddle section and fourth flow rate reduction puddle section are designed to suppress the erosion of the bed by primarily reducing the water energy of the stream flow when the flood occurs, A puddle is formed; And a porous aggregate layer formed by mixing the aggregate with the polyurethane adhesive is disposed on the bed over the whole section in the vertical direction.

In the present invention, the porous aggregate layer may be formed in a multi-layered form so as to increase the size of the aggregate as it goes up. An aggregate is stacked in a multi-layered structure so that the size of the aggregate becomes larger between the bottom and the porous aggregate layer A multilayer filter layer can be formed.

Further, in the present invention, a megaphone may be disposed on the porous aggregate layer in the vertical direction in the first flow velocity reduction zone, the third flow velocity reduction zone and the fifth flow velocity reduction zone. In this case, Can be installed intrusive.

In the present invention, the plurality of puddles are formed in the second flow rate reduction puddle section and the fourth flow rate reduction puddle section at intervals in the lateral direction; In this case, at a position between the heel formed between the recessed puddles formed in the second flow velocity reduction puddle section and the longitudinally straight line, the upper surface of the water-receiving hole The megaliths can be placed continuously on the upper surface until the first flow velocity reduction period.

According to the present invention, it is possible to protect the transversal structure and the river bed by effectively preventing bed erosion caused by running water by laying the porous aggregate aggregate layer on the lower surface by layering the aggregates using vegetable polyurethane without using concrete There are advantages. Particularly, in the present invention, since the porous aggregate layer can be installed in the field, the construction can be simplified and the construction period can be shortened.

In addition, since the present invention has a structure in which aggregates are firmly integrated with each other without requiring a unit structure such as a block or a structure between the structures, even when a flood occurs, separation and deformation of components constituting a bottom- Safety is greatly improved.

In addition, the present invention can create an eco-friendly river by using natural materials such as aggregate, natural stone, and logs.

In addition, in the bed protection zone of the present invention, the puddle and the shoal are repeatedly provided to provide an ecological river which is environment-friendly and has excellent scenery, because fishes and aquatic insects can provide sufficient biotope for staying and scattering and hiding can do.

FIG. 1 is a schematic plan view showing that a bed protection hole according to the present invention is installed from the bottom of a water receiving hole of a transversal structure.
2 is a schematic flow-direction vertical cross-sectional view along line BB in Fig.
3 is a schematic, flow-direction vertical cross-sectional view along line AA of FIG.
Fig. 4 is a schematic enlarged view of the circle C portion of Fig. 2. Fig.
Figure 5 is a schematic enlarged view of the circle D portion of Figure 2;
Figure 6 is a schematic enlarged view of the circle E portion of Figure 2;
Figure 7 is a schematic enlarged view of the circle F portion of Figure 3;
8 is a schematic cross-sectional view showing the cross-sectional shape of the bed protection hole when viewed in the flow direction along the line KK of Fig. 1 with respect to the entire stream width.
Figs. 9-11 are schematic enlarged views of the circle G portion of Fig. 8 showing the longitudinal cross-sectional shape of the puddle when viewed in the flow direction of the effluent in the bed protection hole of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby. The term " longitudinal direction " means a direction in which a stream of a river flows, and "lateral direction " means a direction orthogonal to a longitudinal direction, that is, a width direction of a stream.

FIG. 1 is a schematic plan view showing that a bed protection hole according to the present invention is installed along a predetermined length in the longitudinal direction from the lower end of the water receiving apron 61 of the transversal structure 60. Fig. 2 shows a schematic flow-direction vertical cross-sectional view taken along the line B-B of Fig. 1 in a transverse direction. Figure 3 shows a schematic flow-direction vertical cross-sectional view taken along line A-A. FIG. 4 shows a schematic enlarged view of the circle C portion of FIG. 2 showing the cross-sectional structure of the first flow velocity reduction zone. FIG. 5 is a schematic enlarged view of the circle D portion of FIG. 2 showing the cross-sectional structure of the third flow velocity reduction zone. FIG. 6 is a schematic enlarged view of the circle E portion of FIG. 2 showing the cross-sectional structure of the fifth-order flow velocity reduction zone. Figure 7 shows a schematic enlarged view of the circle F portion of Figure 3 showing the cross-sectional structure of the puddle. 8 is a schematic cross-sectional view showing the cross-sectional shape of the bottom surface protecting bowl when viewed in the direction of flow (longitudinal direction) along the line K-K of FIG. 1 with respect to the entire stream width. In FIG. 1, a thick arrow W indicates the flow of the stream, that is, the direction of the water flow.

As shown in the drawing, a transversal structure 60 such as a beam is formed across a river, and a concrete slab-like water tray apron 61 is formed on the downstream side of the transversal structure 60. The lower floor protection hole 100 is installed on the lower surface 200 of the river bed / river over a predetermined length in the longitudinal direction in succession to the lower end of the water receiving hole 61 of the river transverse structure 60. Specifically, the bed protection hole 100 of the present invention includes a first flow velocity reduction zone 1, a second flow velocity reduction puddle zone 2, a third flow velocity reduction zone 3, The flow rate reduction pit section 4 and the fifth flow rate reduction section 5 are sequentially formed.

As shown in Figs. 1 and 2, the first flow velocity reduction zone 1 is a section continuously formed following the water-receiving hole 601. [ In the section (1) where the first flow velocity is reduced, a megalith stone (50) made of a natural stone on the uppermost layer in the vertical direction cross-sectional configuration (concrete vertical sectional configuration will be described later) The megaliths 50 can be arranged to the upper surface of the water receiving hole 61 as well. That is, the megaliths can be continuously arranged from the upper surface of the water-receiving hole 61 to the section 1 where the primary flow velocity is reduced. However, in arranging the megalithium 50 in the water-receiving hole 61, as shown in FIG. 1, the gap between the recessed puddles 20 formed in the secondary flow rate reduction puddle section 2 is aligned with the longitudinal direction The large stone 50 may be disposed only at a position where the large stone 50 is located. A second flow rate reduction puddle section 2 is formed downstream of the first flow rate reduction section 1 and a recessed puddle 20 is formed in the second flow rate reduction puddle section 2 as described later And a plurality of such puddles 20 may be formed at intervals in the lateral direction. In the second flow rate reduction pond section 2, a shoelike portion is formed between the puddles 20 in the transverse direction. In the position between the puddle 20 and the shoelike straight line in the longitudinal direction, The large stone 50 can be disposed.

The water flow dropped to the water receiving hole 61 of the transversal structure 60 reaches the lower end of the water receiving hole 61 and the water flow is reduced by the meandering stones 50 disposed on the upper surface of the water receiving hole 61, And flows toward the puddle 20 of the puddle section 2 while collecting. That is, if the megaliths 50 are disposed on the upper surface of the water receiving hole 61 in succession to the first flow velocity reduction section 1 as described above, the water flow can be prevented from flowing into the puddle 20 of the second flow rate reduction puddle section 2, So that it can be guided naturally. However, it is not absolutely necessary to dispose the megalithium on the upper surface of the lower end of the water receiving hole 61, and may be omitted.

As described above, the secondary flow rate reduction puddle section 2 has a recessed puddle 20 formed therein. When the flood occurs, the puddle 20 primarily reduces the energy of the stream water, 200) as well as functioning as a habitat for living organisms. The longitudinal cross-sectional shape of the puddle 20, that is, the cross-sectional shape when viewed in the flowing direction of the water flow, may be circular, square, rhombic or semicircular. 9 to 11 are respectively enlarged views of the circle G in FIG. 8, and FIG. 9 is a schematic cross-sectional view of the puddle showing an example in which the longitudinal cross-sectional shape of the puddle 20 is rectangular when viewed in the flow direction of the running water 10 is a schematic cross-sectional view of the puddle showing an example in which the longitudinal cross-sectional shape of the puddle 20 is formed in a rhombic shape when viewed in the flow direction of the flowing water, and Fig. 11 is a schematic cross-sectional view of the puddle 20, Sectional view of the puddle showing an example in which the puddle bottom is pointed in the longitudinal cross-sectional shape of the puddle. In the present invention, the deepest depth of the puddle 20 may be such that the depth is between ½ and ¼ of the height of the transversal structure 60 after a hydraulic effect review.

Downstream of the second flow reduction pit section 2, there is continuously formed a third flow reduction section 3 downstream of the second flow reduction pit section 2. In the downstream of the third flow reduction section 3, A puddle section 4 is formed. That is, a third flow velocity reduction zone 3 is formed between the second flow rate reduction puddle section 2 and the fourth flow rate reduction puddle section 4.

The flow of water flowing through the water-receiving hole (61) into the primary flow reduction section (1) passes through the primary flow reduction section (1), while the primary energy is reduced and the secondary flow reduction puddle section (2), the secondary energy is reduced. Subsequently, the water flows into the tertiary flow reduction section (3) and flows into the downstream section. As a result, the third primary energy reduction is carried out to reduce the flow rate. The primary and tertiary flow reduction zones (1 and 3), along with the function of reducing the flow rate, function as a habitat for organisms to live in, and purify the water quality by increasing the area of contact with oxygen by causing aeration .

The fourth flow velocity reduction pit section 4 formed downstream of the third flow velocity reduction section 3 forms a concave puddle 40. In the fourth flow rate reduction puddle section 4, May be formed with a gap in the lateral direction. The puddle 40 formed in the quaternary flow velocity reduction pit section 4 further weakens the flow of the flowing water horizontally through the third flow velocity reduction section 3 to further reduce the flow velocity, It also functions to provide additional habitat for living creatures. The puddle 40 formed in the quaternary flow velocity reduction pit section 4 may also have a circular, square, rhombic, or semicircular cross sectional depth configuration, similar to the puddle 20 of the secondary flow rate reduction puddle section 2. The puddle 40 formed in the quaternary flow rate reduction pit section 4 may not be as deep as the puddle 20 formed in the secondary flow rate reduction pit section 2. The height of the cross section structure 60 To 1/5 to 1/5 of the thickness of the substrate.

Following the fourth flow rate reduction pit section 4, a fifth flow rate reduction section 5 is continuously formed downstream of the fourth flow rate reduction pit section 4. The fifth flow reduction section (5) further functions as a place suitable for hatching or aquatic organisms by further reducing the flow rate of the water flow.

In the following, the structure in the vertical direction of the floor protecting hole 100 according to the present invention will be described in detail for each section.

The multi-layer filter layer 300 and the porous aggregate layer 400 are sequentially stacked from bottom to top on the lower part 200 over the whole section in the floor protecting hole 100 according to the present invention. In other words, the first flow rate reduction section (1), the second flow rate reduction puddle section (2), the third flow rate reduction section (3), the fourth flow rate reduction puddle section (4), and the fifth flow rate reduction section The multilayer filter layer 300 is formed to have a predetermined vertical thickness on the lower surface 200 over the entire longitudinal length and the transverse width of the multilayer filter layer 300 and the porous aggregate layer 400 is formed to have a predetermined vertical thickness .

First, the multi-layer filter layer 300 is a layer made of aggregate such as sand or gravel. The aggregate having a relatively large size is placed on the upper part of the multi-layer filter layer 300, Layer) having a multi-layer structure of at least one layer. That is, a small-sized aggregate is uniformly placed on the bottom 200 to form a first aggregate layer 301, and aggregates larger in size than the first aggregate layer 301 are stacked on the bottom 200 to have a predetermined thickness The second aggregate layer 302 is formed. If necessary, a third aggregate layer (not shown) may be formed by laying an aggregate larger than aggregate of the second aggregate layer 302 on the second aggregate layer 302. In this manner, Layered filter layer 300 is formed by laminating a plurality of aggregate layers having different sizes of aggregate in a form increasing gradually toward the upper layer. The multi-layered filter layer 300 further weakens the water flow energy of the flowing water flowing vertically downward from the upper side to prevent the bed erosion.

On the upper side of the multi-layer filter layer 300, a porous aggregate layer 400 is formed with a predetermined thickness. The porous aggregate layer 400 is intended to block and attenuate the transfer of the effluent energy directly to the bed so as to prevent the material of the bed material from flowing out due to the influence of the flowing water that flows in the vertical direction. The porous aggregate layer 400 is formed by mixing an aggregate such as gravel with a polyurethane adhesive onto a multi-layered filter layer 300 so as to have a predetermined thickness in the form of a mat as if it were constructed as an asphalt. In the porous aggregate layer 400, a polyurethane adhesive is applied to the surfaces of the aggregates, and the polyurethane adhesive forms a mat in a state of being attached so that the aggregates do not separate from each other. In the present invention, the aggregate is fixed to the upper portion where the running water falls vertically, and the aggregate is fixed by the polyurethane adhesive. As described above, the water flowing over the river transverse structure 60 has a water- The water flows down into the porous aggregate layer 400 and passes through the gap between the aggregates formed in the porous aggregate layer 400, whereby the effluent energy is significantly weakened. Therefore, it is possible to effectively prevent the vertical force due to the falling water from being directly transmitted to the river bed. Particularly, in the porous aggregate layer 400, the aggregate is fixed by the polyurethane adhesive, so that the aggregate can be prevented from being lost even if the water falls and the force is applied to the porous aggregate layer 400. As the polyurethane adhesive, it is preferable to use a known one made of "vegetable" polyurethane.

In forming the porous aggregate layer 400, it is preferable to form the porous aggregate layer 400 in multiple layers as illustrated in the figure. That is, a relatively small aggregate material is mixed with a polyurethane adhesive to form a single layer on the lower side in the vertical direction, and a relatively large aggregate material is mixed with a polyurethane adhesive in the same manner, It is preferable to form the porous aggregate layer 400 so that the aggregates of different sizes form a layer by stacking another layer. According to the porous aggregate layer 400 having such a multi-layer structure, the effect of reducing the energy of flowing water is further doubled. However, the porous aggregate layer 400 in the present invention is not limited to such a multi-layer structure. As the aggregate constituting the multi-layer filter layer 300 and the porous aggregate layer 400, for example, aggregates having sizes of 50 mm, 25 mm, 13 mm and 10 mm can be used. Of course, the size of the aggregate is not limited thereto.

As described above, the multi-layer filter layer 300 and the porous aggregate layer 400 are formed on the bed 200 throughout the entire length of the bed protection hole 100 of the present invention. In addition, the multi-layer filter layer 300 and the porous aggregate layer 400 are formed on the bed 200, And further a pile 51 for fixing the pile is additionally installed.

As shown in Figs. 2 to 6, the first flow rate reduction section 1, the third flow rate reduction section 3 and the fifth flow rate reduction section 5, and the second flow rate reduction puddle section 2, The sheath existing in the gap between the puddles 20 in the transverse direction and the sheath existing in the gap between the puddles 40 in the transverse direction in the quadratic flow rate reduction puddle section 4, A large stone 50 made of a natural stone is installed in the stones 50 and a pile 51 for preventing oil leakage is fixed by fixing the stones 50 in addition.

It is preferable to use a natural stone having a diameter of 50 cm or more as the megamite 50. In this case, The giant stone 50 is preferably installed on the upper surface of the porous aggregate layer 400 so that the lower end of the giant stone 50 is embedded in the porous aggregate layer 400 to a predetermined depth. It is preferable that at least 1/3 of the vertical size of the mega stones 50 be embedded in the porous aggregate layer 400 and fixed. However, the present invention is not limited thereto.

The piles 51 are vertically penetrated into the gaps between the megaliths 50 in order to fix the position of the megaliths 50 and prevent oil leakage. As the pile 51, logs made of logs can be used. It is preferable to use wood treated so as not to be spoiled during a period in which the mega-stones 50 are fixed and stabilized. As the pile 51, for example, a slab having a circular, triangular or rectangular cross section having a diameter of 50 mm or more can be used. However, the present invention is not limited thereto.

The megalithic stone 50 and the pile 51 are divided into a first flow velocity reduction section 1, a third flow velocity reduction section 3 and a fifth flow velocity reduction section 5 excluding the puddles 20 and 40, The sheath existing in the gap between the puddles 20 in the transverse direction and the sheath existing in the gap between the puddles 40 in the transverse direction in the quadratic flow rate reduction puddle section 4 in the lateral flow- Is provided on the upper surface of the aggregate layer (400). Therefore, in the shoelth with the megaliths 50 and the pegs 51, the water flows into the megaliths 50 and flows into a minute water flow, so that the energy of the water is greatly reduced. In addition, through formation of a fine water flow, . That is, in the shoelaces, the megaliths 50 and the pegs 51 are provided on the surface to induce the flow of fine water, thereby creating a natural habitat. Particularly, when water flows through the shoelaces, aeration occurs due to the megaliths 50 and the piles 51. This phenomenon is very advantageous for improving the habitat and water quality of the benthic animals.

According to the present invention, the water flowing through the river crossing structure (60) and passing through the water receiving hole (61) performs a tax cut function from the previous stage before the water flows on the river bed. The flow of water is controlled by the megaliths 50 installed in the vortex generator 50, thereby preventing scouring, that is, eddy erosion due to vortex. The pile 51 supports the megalithium 50 while the vortex erosion prevention by the megalith 50 proceeds to prevent the megalith 50 from being lost.

In the present invention, lateral side wing walls 62 may be formed longitudinally at both lateral ends of the transversal structure 60. In the case where the lateral side wing wall 62 is formed as described above, the bottom side protection hole of the present invention may be formed continuously with the lateral side wing wall 62 It is possible to prevent scouring and departure in the lake, and it is possible to grow a plant between the aggregate pores by inducing the sedimentation of sediments, thereby creating a dimensionally safe and environmentally friendly river environment.

As described above, according to the present invention, the multi-layered filter layer 300 and the vegetable polyurethane are formed at the downstream end of the water-receiving hole 61 of the transversal structure 60 while maintaining the puddle functioning as an organism. A porous aggregate layer 400 having an integral structure in which aggregates are combined is used to prevent erosion of the bed by flowing water to protect the bed at the downstream of the transverse structure 60. Particularly, in the present invention, in the form of a porous aggregate layer 400 having an integral structure in which aggregates are not bonded to each other such as blocks, stones, and gauze, So that separation of the aggregate due to the flowing water, and thus separation and loss, do not occur. Through the formation of the porous aggregate layer 400 and the multi-layered filter layer 300, it is possible to effectively prevent the bottom of the bed from being broken due to the outflow of the bottom by the flowing water, thereby maintaining the bed in a dimensionally stable state.

In addition, the puddle formed in the bed protection hole of the present invention has an advantage that an eco-friendly river environment is formed because the puddle of the present invention functions primarily as a habitat in which creatures can be habituated while suppressing bed erosion by primarily reducing water-

Further, since the puddle and the shoal are repeatedly formed to weaken the flow of the effluent, the present invention can effectively protect the bottom of the stream transversal structure and greatly improve the dimensional stability, It is possible to create an environmentally friendly river, and it is possible to create a favorable environment in terms of scenery.

1: First flow rate cutoff
2: Secondary flow velocity reduction puddle section
3: Third phase flow reduction
4: Quaternary flow velocity reduction puddle section
5: 5th order flow cuts
20, 40: Pool

Claims

A bed protection hole (100) provided on a bed (200) in a longitudinal direction continuously to the lower end of a water receiving hole (61) of a transversal structure (60)
(1), the secondary flow velocity reduction puddle section (2), the third flow velocity reduction section (3), the fourth flow velocity reduction puddle section (4), and the fifth flow rate reduction section (5) are sequentially formed;
In the second flow rate reduction pond section (2) and the fourth flow rate reduction pond section (4), the flow energy of the river stream in the event of flooding is firstly reduced to suppress the erosion of the river bed (200) A recessed puddle 20, 40 is formed which serves as a habitat for habitat;
A bottom guard including a wing wall is integrated;
A porous aggregate layer 400 is formed on the bed 200 over the whole section in the vertical direction in the bottom floor protection hole 100 by mixing the aggregate with a polyurethane adhesive. In the downward direction, a relatively small-sized aggregate is mixed with a polyurethane adhesive to form a single layer, and a relatively large-sized aggregate is mixed with a polyurethane adhesive, and another layer is laminated Layer structure in which aggregates of different sizes are layered so as to increase the size of the aggregate toward the top;
A multi-layered filter layer 300 is formed between the bottom 200 and the porous aggregate layer 400 such that the size of the aggregate increases as it goes up. The multi-layered filter layer 300 has aggregate A first aggregate layer 301 formed so as to have a uniform thickness on the bed 200; And a second aggregate layer (302) formed so as to have a larger size of aggregate than the aggregate constituting the first aggregate layer (301) so as to have a thickness on the first aggregate layer (301);
The megaliths 50 are disposed on the porous aggregate layer 400 in the vertical direction in the first flow velocity reduction zone 1, the third flow velocity reduction zone 3 and the fifth flow velocity reduction zone 5, A supporting pile (51) is installed between the megaliths (50);
The upper surface of the water-receiving hole 61 is continuously provided with a megalithium on the upper surface thereof until the primary flow velocity reduction section 1. The upper surface of the water-receiving hole 61 is formed in the secondary flow rate reduction puddle section 2 The megaliths 50 are disposed only at the position between the gap between the concave puddles 20 and the longitudinal direction thereof;
The puddles 20 and 40 are formed at plural intervals in the transverse direction in the second flow rate reduction puddle section 2 and the fourth flow rate reduction puddle section 4 and the plurality of puddles 20 and 40 And a shade is formed in the lateral gap;
The flow of water flowing through the water-receiving hole (61) into the primary flow reduction section (1) passes through the primary flow reduction section (1), while the primary energy is reduced and the secondary flow reduction puddle section (2), the water is secondarily reduced in energy and then flows into the third flow-rate reduction zone (3), flows into the downstream, and the third flow-through energy reduction is progressed to reduce the flow rate, The flow rate of the water is reduced and the flow rate thereof is reduced while the water flows sequentially through the puddle 40 and the fourth flow velocity reduction section 5 of the fourth flow velocity reduction section 4 and flows into the puddles 20, 40), and performs a function of purifying the water quality by increasing an area in which water flows into contact with oxygen by generating an aeration.

delete

A method of constructing a lower floor guard (100) provided on a lower floor (200) in a longitudinal direction continuously to the lower end of a water receiving hole (61) of a transverse structure (60)
(1), the secondary flow velocity reduction puddle section (2), the third flow velocity reduction section (3), the fourth flow velocity reduction puddle section (4), and the fifth flow rate reduction section (5) are formed sequentially;
In the second flow rate reduction pond section (2) and the fourth flow rate reduction pond section (4), when the flood occurs, the flow energy of the stream flow is first reduced to suppress the erosion of the bed section (200) Form a recessed puddle (20, 40) which serves as a habitat for habitat;
In the vertical direction, the multi-layer filter layer 300 is formed on the bed 200 over the entire section of the lower floor protection hole 100, and the porous aggregate layer 400 is formed on the multi-layer filter layer 300.
The multi-layer filter layer (300) comprises a first aggregate layer (301) formed by uniformly laying an aggregate so as to have a thickness on the bottom (200); And a second aggregate layer 302 formed on the first aggregate layer 301 so as to have a larger size than the aggregate composing the first aggregate layer 301 and having a thickness on the first aggregate layer 301, The aggregate is stacked in a multi-layered structure;
The porous aggregate layer 400 is formed by mixing a relatively small aggregate material with a polyurethane adhesive to form a single layer on the lower side in the vertical direction and then mixing a relatively large aggregate material with a polyurethane adhesive A plurality of aggregates of different sizes are formed in layers in the form of stacking another layer to form a multi-layered structure having a larger aggregate size as it goes up;
In the first flow velocity lowering section 1, the third flow velocity lowering section 3 and the fifth flow velocity lowering section 5, the large stones 50 made of natural stone are placed on the porous aggregate layer 400 in the vertical direction, A large stone 50 is installed in a state where at least one third of the vertical size of the large stone 50 is embedded in the porous aggregate layer 400 at the lower end of the large stone 50, (51) is penetrated and installed;
The upper surface of the water-receiving hole 61 is continuously provided with a megalithium on the upper surface thereof until the primary flow velocity reduction section 1. The upper surface of the water-receiving hole 61 is formed in the secondary flow rate reduction puddle section 2 The megaliths 50 are disposed only at the position between the gap between the concave puddles 20 and the longitudinal direction thereof;
The puddles 20 and 40 are formed at plural intervals in the transverse direction in the second flow rate reduction puddle section 2 and the fourth flow rate reduction puddle section 4 and the plurality of puddles 20 and 40 Shafts are formed in the transverse spacing;
The flow of water flowing through the water-receiving hole (61) into the primary flow reduction section (1) passes through the primary flow reduction section (1), while the primary energy is reduced and the secondary flow reduction puddle section (2), the water is secondarily reduced in energy and then flows into the third flow-rate reduction zone (3), flows into the downstream, and the third flow-through energy reduction is progressed to reduce the flow rate, The flow rate of the water is reduced and the flow rate thereof is reduced while the water flows sequentially through the puddle 40 and the fourth flow velocity reduction section 5 of the fourth flow velocity reduction section 4 and flows into the puddles 20, 40 to provide an organism habitat and to cause an aeration to increase the contact area of the water stream with oxygen, thereby performing the function of purifying the water quality.