KR101611864B1 - Scour protective structure for protecting weir lower streambed scour - Google Patents

Abstract

[0001] The present invention relates to a scour protection bar for prevention of detailed bore underwater underwater, and in particular, the present invention relates to a multiple bore protection bore extending on both sides with an inclination direction on the basis of the running direction of water flow. And a bottom protective member to which the multi-protective protrusions are uniformly supported, wherein each of the protective protrusions is positioned on the same line.
According to the present invention, a plurality of "V" -shaped protrusions are provided on the bottom protection member to reduce the flow rate and disperse the head of the headwater while changing the direction of the water flow, Unlike the existing method of extending the length of the protection member to the area where the oyster occurs, the length of the bottom protection member is reduced to reduce the maintenance cost due to the loss of the bottom protection member.

Description

{SCOUR PROTECTIVE STRUCTURE FOR PROTECTING WEIR LOWER STREAMBED SCOUR}

More particularly, the present invention relates to a scour protection ball for preventing detailed submergence of a subterranean submarine under the subterranean submarine.

The present invention is derived from research carried out as part of the Engineering Education Innovation Project of the Ministry of Education, Science and Technology and the Korea Advanced Institute of Science and Technology. [Project Assignment Number: 201201A007, Project Name: Global Innovation Education Innovation Based on Urban Specialization] KCUE-10 Number B02, Project Name: Advancement of Bachelor's Degree System and Student Instruction-Experience Learning Program (KCUE-10) (ELP).

In general, water and rocks flowing from the sea or the bottom of the rocks and the bottom of the soil is washed away and called scour. If such a cave is deepened, the boat may be eroded or the boat may collapse in severe cases. Therefore, in order to protect the structure, it is necessary to prevent the scouring of the gravel by carrying out various works such as revetment, watering, and flooring.

Such scavenging-related technology has been proposed in Patent Registration No. 1008188 and Published Patent Application No. 2011-0130006.

Hereinafter, as a conventional technique, a scour protection ball disclosed in Patent Registration No. 1008188 and Published Patent Application No. 2011-0130006 will be briefly described.

1 is a front perspective view of a scraper prevention structure according to the prior art 1. 1, the anti-slip structure 10 is provided on the upstream side of the front part of the pier 6 so as to correspond to the flow direction, and the downflow 2 is blocked on the front part of the anti- The bottom plate 11 and the induction water wall 12 are provided as upward sloping induction water so that the diffusion portion 15 is disposed on the side surface of the bridge pillar 11 so as to reduce the soil movement, An intermediate wall 14 and a bottom plate 16 for supporting the induction bottom plate 11 and a shear key 13 for increasing the frictional force between the bottom and the bottom.

However, the anti-scoop structure according to the prior art 1 has a problem in that it can not provide a solution according to the drop head.

FIG. 2 is a block diagram showing a schematic structure of an environmentally-friendly scouring protection hole according to Prior Art 2. As shown in FIG. Referring to FIG. 2, the conventional art 2 relates to a scour protection bar constructed on a bridge, a bridge, an underwater bridge, a river, a port, a hand structure, a parapet, The present invention relates to an eco-friendly scour guard that does not cause environmental pollution when a geosynthetic fiber foam is installed at the bottom of a slope and concrete, mortar, or solidified soil is filled into the geosynthetic fiber foam to construct a scorch protection hole.

However, as in the prior art 1, there is a problem that the environmentally-friendly scouring protection ball according to the prior art 2 can not provide a solution according to the drop head.

KR 1008188 B1 KR 2011-0130006A

It is an object of the present invention to solve the problems of the prior art as described above, and it is an object of the present invention to provide a floor protecting member in which a plurality of "V" shaped protrusions are provided to disperse a flow velocity reduction head And to provide a scour protection ball for the prevention of sub-detailed sub-submergence of the submerged underbody, which makes it possible to prevent the submerged submergence of the underwater submergence.

It is another object of the present invention to provide a floor protecting apparatus which can reduce the length of the bottom protecting member and reduce the maintenance cost due to the loss of the bottom protecting member, And to provide a scour protection ball for preventing sub-detailed oysters.

According to an aspect of the present invention for achieving the above-mentioned object, the present invention provides a washing machine comprising: a plurality of "V" protruding protrusions extending in both directions on the basis of a flow direction of water flow; And a bottom protection member to which the multiple protection protrusions are uniformly supported, wherein a tip end of the protection protrusion is achieved through a scour protection hole for preventing sub-detailed sub-depths located on the same line.

Further, in the present invention, the protective protrusions may be formed such that the front surface and the back surface have a vertical cross-sectional shape.

In addition, in the present invention, the protective protrusions may have a sloped surface in a front section and a vertical surface in a rear section in cross-sectional shape.

Further, in the present invention, the protective protrusion may have a curved surface in a frontal shape and a vertical surface in a rear surface in a cross-sectional shape.

Further, the protective protrusion in the present invention may be formed such that the entire width (b) is 0.2 to 1.0 times the width of the ridge portion (a).

In the present invention, the protrusion may be formed to have a height H of 0.1 to 0.3 times the height of the underwater beam.

In addition, the protective protrusion in the present invention may be formed at an angle of 90 DEG to 150 DEG.

In addition, in the present invention, the protrusion may have a thickness t of 1/10 or more of the protrusion height H of the protrusion.

In addition, in the present invention, the adjacent protrusion may be formed to have an interval d between 0.7 times and 1.4 times the height H of the protrusion.

In addition, the number of the protrusions in the present invention may be three to eleven (n).

In addition, the bottom protection member of the present invention may have a plurality of inclined engagement grooves corresponding to the protection protrusions on the surface thereof.

According to the present invention, a plurality of "V" -shaped protrusions are provided on the bottom protection member to reduce the flow rate and disperse the head of the headwater while changing the direction of the water flow, Unlike the existing method of extending the length of the protection member to the area where the oyster occurs, the length of the bottom protection member is reduced to reduce the maintenance cost due to the loss of the bottom protection member.

1 is a front perspective view of an anti-scraping structure according to Prior Art 1. Fig.
FIG. 2 is a schematic view showing a schematic structure of an environmentally-friendly scouring protection ball for Prior Art 2. FIG.
FIG. 3 is a schematic view showing a state in which a scour protection ball for preventing sub-detailed oysters underwater is installed at the bottom of underwater beams of the present invention.
FIG. 4 is a plan view showing a state in which a scour protection ball for preventing sub-detailed sub-elevations of a submerged bridge according to the present invention is mounted on a lower portion of a submerged bridge.
FIG. 5 is a perspective view showing a scour protection hole for preventing detailed submergence of the submerged underwater of the present invention. FIG.
Fig. 6 is a perspective view showing the specifications of the protrusion protrusion in the scour protection pit for preventing the detailed pit under the underwater load of the present invention.
FIG. 7 is a plan view showing a flow state of running water by a scour protection shoe for preventing detailed submergence under the submergence of the present invention. FIG.

The terms or words used in the present specification and claims are intended to mean that the inventive concept of the present invention is in accordance with the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain its invention in the best way Should be interpreted as a concept.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the term " part "in the description means a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the accompanying drawings, the construction of an embodiment of a scour protection ball for preventing sub-detailed sub-depths according to the present invention will be described in detail.

FIG. 3 is a schematic view showing a state in which a scour protection ball for preventing a detailed underwater sub-limit of the present invention is mounted on a lower portion of a submerged bridge, and FIG. 4 is a schematic view of a submerged sub- FIG. 5 is a perspective view of a scour protection shoe for preventing detailed submodern beneath the underwater bridge of the present invention, and FIG. 6 is a perspective view of a submerged protection hole And FIG. 7 is a plan view of the flow of running water by a scouring protection hole for preventing a detailed bore under the underwater bridge of the present invention.

The scour protection bores 100 for preventing detailed bores under the underwater according to the present invention include a bottom protection member 110 and a protection protrusion 120. The scour protection bores 100 are installed under the underwater weeping portion do. Since the dropping point (dropping point) of the scouring protection ball 100 is fluid due to the seasonal change and the flow rate change, the number n of the protection protrusions 120 is set to be within the range of the scouring protection hole 100 . (See Fig. 3)

The floor protecting member 110 is formed in a plate shape so as to uniformly support the bottom surfaces of the multi-placed protecting protrusions 120. Further, although not shown in the drawings, the bottom protection member 110 may be formed with protrusions or the like on its bottom surface to prevent separation due to water or the like when the bottom protection member 110 is fixed to the bottom of a river.

The protective protrusions 120 are formed in a plurality of 'V' -shaped hydraulic structures on the bottom protection member 110 and are extended and formed to have symmetrical inclined directions on both sides with respect to the traveling direction of the running water , And four in the present embodiment.

In other words, the protective protrusions 120 are formed in a shape of "V" when viewed from the plane, and are disposed in parallel with the running direction of the water flow while the vertex portions of the rear ends face rearward, Direction perpendicular to the traveling direction).

Here, the protective protrusions 120 change the direction of flow of the water by the inclined surface, and the flow of water flows to the forward protrusion 120 by dispersing the flow rate and headwater head while the water flows on the inclined surface , The forward protrusion 120 also repeats the movement of the flowing water such as the flow direction change, the flow rate reduction, and the head drop dispersion as in the rear protrusion 120. In order to prevent the scour phenomenon at the forefront of the scour protection bores 100 of the present embodiment, the functions of the flow direction change, the flow velocity reduction, and the head drop dispersion are repeated for each protection protrusion 120.

In addition, the protrusion 120 may have a cross-sectional shape such that the front surface and the back surface are formed as vertical surfaces, and when water flows on the back surface, which is a vertical surface, the head due to the fall is reduced,

Meanwhile, as shown in FIG. 4, the description of the protrusion 120 can be described as follows. (See Fig. 6)

First, the entire width (b) of the protective protrusion is set to 0.2 to 1.0 times, preferably 0.4 to 0.8 times the width (a) of the ridge portion with respect to the center of the steel. If it exceeds 0.8 times, there is a possibility of erosion on the coast of the river. If it is less than 0.4 times, the effect of dispersing headwater head is insufficient. It is preferable that the center of the scouring protection hole 100 (the vertex connecting line of the protection protrusions) is provided so as to coincide with the center of the steel in the width c.

The guard protrusion height (H) is 0.1 to 0.3 times, preferably 0.125 to 0.25 times the height of the corresponding underwater beam, and when the height (H) exceeds 0.25 times the height of the ash beam, , And less than 0.125 times the height of the underwater beam, the effect is insufficient.

Next, the protective projection angle? Is formed in the range of 90 ° to 150 °, preferably 90 ° to 140 °. When the angle θ is less than 90 °, the dispersion effect is insufficient. When the angle exceeds 90 °, The stress and conduction risk acting on the structure increases.

Next, it is preferable that the thickness of the protrusion protrusion t is formed to be at least 1/10 of the protrusion protrusion height H with a minimum thickness of 15 cm for securing structural stability, and 1/10 of the protrusion protrusion height H , There is a risk of fracture due to an increase in shear and bending stresses in the structure.

Next, the minimum distance between the protrusion protrusions (d) is 0.9 m, which is 0.7 to 1.4 times, preferably 0.9 to 1.2 times the protrusion height (H) , And when it exceeds 1.2 times the height of the protrusion protrusion (H), the dispersion effect is insufficient.

Finally, since the number of protrusions n is formed to be 2 to 11, preferably 3 to 9, and the dropping point is fluid according to the flow rate and seasonal variation, It is necessary to adjust the size of the scouring protection hole 100 by adjusting the number according to the size of the stream.

Although not shown in the figure, the protective protrusions 120 may be formed in an oblique shape in a frontal view and a vertical surface in a cross-sectional shape, or may have a curved surface in a frontal view and a vertical surface in a rearal view . This acts as a guide when the runoff collides with the protective protrusion.

Although the protective protrusions 120 are formed integrally with the bottom protection member 110, the protection protrusions 120 may include a plurality of "V" shaped A plurality of coupling grooves can be formed and detachably attached to the coupling grooves, and the spacing of the guard protrusions can be adjusted according to the coupling position. Thus, when the protrusion can be attached and detached, it can be firmly fixed to the floor protecting member through a separate bracket (not shown).

Although the protrusion protrusion 120 in this embodiment is illustrated as having a multi-step "V" shape, the protrusion 120 is not limited thereto and may be modified into a multi-stage triangular pole, a multi-stage semi-circular pole,

In the following Table 1, it is assumed that a scour guard having a multi-stage rectangular triangular prism protrusion is referred to as a structure A, a scour guard having a multi-stage semicircular prism as the protrusion protrusion is referred to as a structure B, and the protrusion is a triangular prism The scour protection bar is referred to as a structure C, and in this embodiment, the scour depth when the scour protection bar 100 including multi-stage "V"

Type Structure A Structure B Structure C Structure D




rescue
shape

basic
Specifications height: 1.0m
width: 1.0m height: 0.4m
D: 0.8 m height: 1.2m
width: 1.2m height: 1.0m
thickness: 0.15m
Characteristic Stepwise head reduction effect Stepwise head reduction effect Expect scour reduction with a small amount of material Formation of waterway in the structure, anticipation of scour reduction

First, the degree of scouring was tested through C.F.D and STAR-CCM + Information for each structure A, B, C,

Computational fluid dynamics (CFD) uses Navier-Stokes equations, a nonlinear partial differential equation describing fluid phenomena, as finite difference method (FDM), finite element method (FEM) Volume Method) and converted to algebraic equations, which are solved and analyzed by using numerical algorithms.

In the CFD analysis process, the model of the analytical model (Catia, Catia), the model of Star-ccm + is called up, the mesh is created, and the model of the analytical model is divided by the boundary condition. The flow direction is determined by setting the inlet to the inlet (inlet) / outlet (outlet), and the flow direction is determined by setting the flow condition to the wall (physical condition setting: Liquid / turbulent / K- You can also check the Velocity, pressure, etc. by specifying the Scene (the point you want to focus on later) and changing the Report - surface Averege - turbulent kinetic energy setting.

The program uses STAR-CCM + Information. From CAD to post-processing, STAR-CCM + provides an integrated CFD process in a single intergrated software environment. By allowing CAD or grid to be created automatically, it provides faster, more accurate results. And STAR-CCM + has the ability to copy and paste components between surface wrapping, high-quality automatic gratings (when creating a polyhedral or hexahedral grid) and models.

As shown in Table 2, C, F, and D of the bottom surface and the bottom surface of each pole of each structure are analyzed as follows.

structure Results of CFD Analysis on the Floor (Turbulent Kinetic Energy) A

B

C

D

Energy distribution

In addition, Table 2 shows the energy distribution of water occurring after the structure, when each hand structure is analyzed through C.F.D program, in the bottom part. Through the energy distribution diagram at the bottom of the table, it can be seen that the closer to the left the energy of the water is smaller, and vice versa, the closer to the right, the greater energy is concentrated.

Here, it can be assumed that more oysters are generated in a place where energy is concentrated. The reason is that the larger the energy of the water, the greater the force that can be transmitted when it hits the soil at the bottom, resulting in further scouring of the soil.

색 이상의 에너지를 가지는 부분의 넓이를 계산해서 하기 표 3에서와 같이 비교해 보았다.
Based on these assumptions, the following table shows that the structures A and B, which do not sufficiently reduce the energy of the water after the floor protection member, would be less effective. Conversely, we concluded that the structures C and D, in which the energy of the water is sufficiently dispersed and reduced after the floor protection member, are effective. In order to make a more accurate conclusion,

The width of the portion having energy above the color was calculated and compared as shown in Table 3 below.

Structure A 70% Structure B 55% Structure C 40% Structure D 36%

Numerical calculations have proved the efficiency of structures C and D more accurately.

structure Results of CFD Analysis on the Floor (Turbulent Kinetic Energy) A

B

C

D

Energy distribution

Table 4 shows the energy of the water after each structure when the CFD program interprets it. It can be seen that there is no significant difference in the bottom compared to the results. Here, it can be seen that the case of structure D disperses energy very effectively.

The following Tables 5 and 6 are test results which can indirectly confirm the shape of the water flow in the absence of the structure and the shape of the structure D through the CFD analysis.

Table 5 shows velocity dispersion and degree of reduction before and after installation of scour protection structure. (Degree of dispersion of flow velocity vector and scalar amount)

Table 6 shows the degree of reduction of wall shear stress before and after installation of scour protection structure.

Table 5 and Table 6 show that structure D effectively reduces the velocity and wall shear stress when compared to the case without structure.

Scour shape

Scour

Therefore, as shown in Table 6, the sculptural shape before the scouring is indicated in black, the sculptural shape in the absence of the hand structure is indicated in red, the sculptural shape for the structure A is indicated in blue, Purple, the sculptural shape for the structure C is indicated in yellow, and the sculptural shape for the structure D is indicated in green.

Here, the model of the beam applied with the Fr law is constructed on the scale of 1: 160 in the experiment on the scour shape. It is the most severe in the middle part of the river, and the reason is assumed to be the concentrated discharge of gate 2 of the operation gate. In other words, we are interested in the scouring of the movable beam (vertical dropping hole). Therefore, the modeling work for the gate 40m of the movable beam 2 is carried out.

은

이다. 함안보의 방류량은 직접적으로 측정할 수 없었기 때문에 가까운 도산 관측소의 유량측정성과를 바탕으로 평균유량을 산정하였다.And the flow in the beam model

silver

to be. The average flow rate was calculated based on the flow measurement performance of the near banking observatory because the discharge of the ship security could not be measured directly.

이므로 모델의 유량

이다.Average flow in 2012

The flow rate of the model

to be.

And we assumed that the flow time of the model produced for the experiment is 3 minutes (the actual supply time of the security is 38 minutes).

Hand structures No structure A B C D Maximum scour depth 15mm 11mm 11mm 11mm 4mm Actual scour 2.4m 1.76m 1.76m 1.76m 0.64m Scour reduction ratio 0% 26.67% 26.67% 26.67% 73.33%

As shown in Table 8, the maximum scour is 15 mm when no structure is installed, and the maximum scour of structures A, B, and C is 11 mm, which is about 26.67% less than when there is no structure. The maximum depth of scour in Structure D was 4mm, which was more effective in reducing scour than A, B, and C. This is expected to be due to the effective dispersion of runoff and drift. As a result, it can be seen that D has a high efficiency of 200% or more compared with other structures in terms of scour reduction.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the equivalents of the appended claims, as well as the appended claims.

100: scour protection
110:
120: Protective projection
a: width of the overflow
b: Overall protrusion width
c: Kang Width
d: protrusion interval
H: Protrusion height
n: Number of protrusions
t: Protective protrusion thickness
θ: Protrusion projection angle

Claims (11)

Quot; V "-shaped protrusions extending so as to have an inclination direction on both sides with respect to the running direction of the water flow, but having the same oblique direction and gradually decreasing the extension distance; and
Wherein the multi-protection protrusions are uniformly supported,
Wherein each of the protection protrusions is positioned on the same line,
The protective protrusion is installed in the lower portion of the underwater portion (the ridge portion), and the protrusion is positioned such that the drop point enters the scour protection hole,
Wherein the protective protrusions are formed at an angle of 90 DEG to 150 DEG and spaced apart from each other by an interval of 0.7 to 1.4 times the height H of the protective protrusions,
The bottom protection member has a plurality of inclined engagement grooves corresponding to the protection protrusions so as to be fixed to the surface of the bottom protection member so that the interval between the protection protrusions can be adjusted according to the engagement position of the protection protrusions. Scour shield.
The method according to claim 1,
Wherein the protective protrusion has a cross-sectional shape in which the front surface and the back surface are formed as vertical surfaces,
The method according to claim 1,
Wherein the protective protrusion has a cross-sectional shape in which a front surface is formed with an inclined surface and a rear surface is formed by a vertical surface.
The method according to claim 1,
Wherein the protective protrusion has a curved surface in a front section and a rear surface in a vertical section.
5. The method according to any one of claims 2 to 4,
Wherein the protective protrusion has a total width (b) of 0.2 to 1.0 times the width of the overflow portion (a).
5. The method according to any one of claims 2 to 4,
Wherein the protective protrusion is formed by a height (H) of 0.1 to 0.3 times the height of the underwater beam.
delete 5. The method according to any one of claims 2 to 4,
Wherein the protective protrusion has a thickness (t) of 1/10 or more of the height (H) of the protective protrusion.
delete 5. The method according to any one of claims 2 to 4,
Wherein the protective protrusion has a number (n) of three to eleven.
delete

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