KR20070082152A - The structure of precast concrete culvert - Google Patents

The structure of precast concrete culvert Download PDF

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KR20070082152A
KR20070082152A KR1020060014581A KR20060014581A KR20070082152A KR 20070082152 A KR20070082152 A KR 20070082152A KR 1020060014581 A KR1020060014581 A KR 1020060014581A KR 20060014581 A KR20060014581 A KR 20060014581A KR 20070082152 A KR20070082152 A KR 20070082152A
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precast concrete
culvert
concrete culvert
inverse
reducing
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KR1020060014581A
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Korean (ko)
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정태화
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정태화
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B13/00Irrigation ditches, i.e. gravity flow, open channel water distribution systems
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B5/00Artificial water canals, e.g. irrigation canals
    • E02B5/08Details, e.g. gates, screens
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F3/00Sewer pipe-line systems
    • E03F3/04Pipes or fittings specially adapted to sewers
    • E03F3/046Open sewage channels

Abstract

A structure of a precast concrete culvert is provided to have a superior sectional surface advantageous for a hydraulic characteristic by reducing a turbulent flow, and to facilitate maintenance work by reducing sedimentation. A structure of a precast concrete culvert has a bottom section. The bottom section of the precast concrete culvert structure has an inverse-arc shape. The structure of the precast concrete culvert is used when a fillet or a chamfer is formed for reducing a sudden sectional variation between the inverse-arc shaped bottom and a vertical wall of the precast concrete culvert. The inverse-arc shaped bottom of the precast concrete culvert has a radius larger than a width of a fluid path by about 0.75 to 2 times. The flow rate of fluid is constantly maintained so that turbulent flow is not generated.

Description

피씨 수로암거 구조{The Structure of Precast Concrete Culvert}The Structure of Precast Concrete Culvert}
도 1은 본 발명에 따른 수로에 사용되는 PC 암거의 절개단면임.1 is a cutaway cross-sectional view of a PC culvert used in the channel according to the present invention.
도 2는 본 발명에 따른 수로에 사용되는 PC 암거의 절개단면임.2 is a cutaway cross-sectional view of a PC culvert used in the channel according to the present invention.
도 3은 본 발명에 따른 수로에 사용되는 PC 암거의 겨냥도임.Figure 3 is a view of the PC culvert used in the waterway according to the present invention.
도 4는 수로 유수단면 형상에 따른 유속의 분포도임.4 is a distribution diagram of the flow velocity according to the channel flow path surface shape.
도 5는 본발명에 따른 또 다른 적용의 예임.5 is an example of another application according to the present invention.
도 6은 본발명에 따른 또 다른 적용의 예임.6 is an example of another application according to the present invention.
본 발명은 PC 수로암거의 수촉부의 하부단면에 관한 것으로 종래에는 평면으로 제작, 시공되고 있어 갈수기의 작은 유량에서는 수리학적으로 불리하여 유속이 급감하여 토사가 침적하여 잦은 준설이 필요하나 제작시에 거푸집제작이 간단하여 널리 사용되는 실정임. The present invention relates to the lower end surface of the contact part of the PC channel culvert, which is conventionally manufactured and constructed in a flat surface, which is disadvantageously hydraulic at a small flow rate of the dry season, so that the drastic sedimentation of the soil due to the rapid decrease in the flow rate, The production is simple and widely used.
본 발명은 PC 수로 암거의 공장제작에 있어 보다 수리학적으로 유리한 단면을 가지게 되면서도 제작단가에 영향이 작고 구조 역학적으로 우수한 단면을 개발하고자 함.The present invention aims to develop a cross section which has a more hydraulically favorable cross section in the manufacture of a PC channel culvert, while having a smaller influence on the manufacturing cost and having excellent structural dynamics.
1. 본 발명은 배수관,농업용 수로관, 특히 프리캐스팅 암거(이하 암거라 칭함,)의 제작에 있어서 관로중의 물이 흐르면서 접촉하게 되는 바닥의 단면 구조에 관한 것이다.1. The present invention relates to a cross-sectional structure of a bottom which is brought into contact with water flowing in a pipeline in the manufacture of a drain pipe, an agricultural water pipe, in particular a precast culvert (hereinafter referred to as culvert).
2. 우수배제 목적을 가지는 자연유하를 하는 암거 단면적의 크기의 산정에는 일반적으로 Manning의 식이 사용되는데 이를 살펴보면,2. In general, Manning's equation is used to estimate the size of the natural culvert cross section with the purpose of drainage.
Q = A * V Q = A * V
여기서 A : 유수 단면적 V : 유속Where A: flow cross-sectional area V: flow rate
V = 1/ n * R^⅔ * S^½V = 1 / n * R ^ ⅔ * S ^ ½
여기서 n : 조도계수 R : 경심 S : 경사Where n: roughness coefficient R: hardness S: slope
따라서 암거의 제작 과정에서 수로의 유속에 영향을 미칠 수 있는 요소는 경심( R )으로 Therefore, the factor that can affect the flow rate of the channel during the construction of the culvert is
R = A / PR = A / P
여기서 P : 침윤선(단면에서 측정된 액체 고체 접촉면의 길이)길이Where P is the penetration line (length of the liquid solid contact surface measured at the cross section)
즉, 동일 단면적을 가진다면 침윤선이 짧을수록 경심이 커지고 따라서 유속이 커짐을 알 수 있는데 각종 단면형상의 침윤선 길이를 알아보면 In other words, if they have the same cross-sectional area, the shorter the infiltration line is, the greater the hardness and hence the flow velocity.
Figure 112006011077376-PAT00001
Figure 112006011077376-PAT00001
여기서 B는 유수 단면의 폭, H는 유수단면의 높이임.Where B is the width of the flowing section and H is the height of the surface.
각각의 단면에서 유수단면의 크기( A )가 같을 경우 (예를 들어 4 ㎡ ) 또한 B = 2 m 일 경우의 각각의 침윤선( P ) 는,When the size of the guide surface A in each cross section is the same (for example, 4 m 2), and each infiltration line P when B = 2 m,
1) 사각형에서 6 m 1) 6 m from the square
2) 반원에서 5.57 m 2) 5.57 m from semicircle
3) 삼각형에서 5.818 m 로 되어, 반원형의 침윤선 길이가 가장 작음을 알수 있다.3) It is 5.818 m in triangle, so the semicircular infiltration line length is the smallest.
3. 한편 반원형에서도 반경의 크기에 따라서 침윤선의 길이는 달라지는데 각각의 대표적인 반경에 대하여 계산한 결과는 아래의 표와 같다.3. In semicircular shape, the length of infiltration line varies according to the size of the radius. The results of calculation for each representative radius are shown in the table below.
반경Radius h1h1 h2h2 HH PP
2/B2 / B 1One 1.51.5 2.52.5 5.0945.094
2/3B2 / 3B 0.3820.382 1.7351.735 2.1172.117 5.6595.659
BB 0.2680.268 1.8191.819 2.0872.087 5.7325.732
1.5B1.5B 0.1720.172 1.8851.885 2.0572.057 5.8095.809
2B2B 0.1270.127 1.9151.915 2.0422.042 5.8525.852
2.5B2.5B 0.1010.101 1.9321.932 2.0332.033 5.8785.878
3B3B 0.0840.084 1.9451.945 2,0292,029 5.8995.899
Figure 112006011077376-PAT00002
Figure 112006011077376-PAT00002
이표의 내용에서는 유수단면을 일정한 크기( A = 4, B = 2 )로 하고 호의 반경의 반지름을 점차 크게 한 결과를 계산한 것으로 반경의 증가에 대하여 침윤선의 길이는 비례적으로 늘지 않고 그 증가분은 체감한다(순량은 증가).In this table, we calculate the result of gradually increasing the radius of the arc with a constant size (A = 4, B = 2). The length of the infiltration line does not increase proportionally with the increase of the radius. Feel it (the net quantity increases).
따라서 반경의 증가에 대한 침윤선 길이의 변화는 실용적으로는 2B이하가 적당하다.Therefore, the change in infiltration line length with increasing radius is practically less than 2B.
4. 한편 단면의 종류에 따른 단면별 유속의 분포를 살펴보면 도3 과 같은데 이로써 자연 유하하는 개로안의 우수의 속도는 유수의 바닥과 벽에서는 정체되고 단면의 중앙으로 갈수록 증가하다가 대기와의 접촉부에서 다시 감소한다.4. On the other hand, the distribution of flow velocity by cross section according to the type of cross section is as shown in Fig. 3. Thus, the velocity of rainwater flowing down in the natural flow path stagnates at the bottom and wall of the flowing water, increases toward the center of the cross section, and then at the contact with the atmosphere again. Decreases.
5. 유수 단면에서의 각부(바닥의 모서리 부분)는 계산상 단면적에는 포함되지만 실제 통수에는 기여도가 낮다.5. Each part (floor edge) of the flowing section is included in the cross-sectional area of calculation but contributes less to actual water flow.
6. 따라서 본 발명에서는 도1과 같이 기존의 수로용 PC 암거에서 유수와 접촉하게 되는 바닥부를 인버터(역 아치)로 구성하되 그 반경은 효과가 실증적이며 암거 자체의 구조상 단면의 심각한 변화를 가져오지 않는 정도인 암거 유효폭의 0.5 - 2 배 이내로 하되 이상적으로는 0.75 - 1.5 배로 하는 것이다.6. Therefore, in the present invention, as shown in Fig. 1, the bottom part which comes into contact with the flowing water in the conventional PC culvert for waterway is composed of an inverter (inverted arch), but the radius of the effect is empirical and does not bring about a serious change in the structural cross section of the culvert itself. It should be within 0.5-2 times the effective width of the culvert, but ideally 0.75-1.5 times.
이렇게 되면 단면 내에서 유속의 분포가 일정하게 되어 난류가 적게 되고 수리학적으로 유리하게 될 뿐만 아니라 적은 유량에서도 유속의 감소가 상대적으로 작으며 통수량이 줄어 침적이 일어날 경우에도 토사가 인버터의 경사를 따라 중앙의 바닥으로 모이게 되며 이 부분에서는 상대적으로 유속이 빨라서 침적의 가능성이 작아지고 또한 통수량이 다시 증가하는 시기에 중앙부의 보다 빠른 유속의 증가로 토사의 자연 제거가 가능하여 갈수기에도 토사침적의 가능성이 감소하여 유지관리에 도움이 된다.This results in a constant distribution of flow velocity in the cross section, resulting in less turbulence and hydraulic advantages, as well as a relatively small flow rate reduction at low flow rates and reduced sedimentation of the inverter in the event of deposition. Therefore, it is gathered to the bottom of the center. In this part, the flow velocity is relatively high, so the possibility of deposition decreases. Also, when the flow rate is increased again, it is possible to remove the earth and sand naturally by increasing the flow velocity faster in the center. The likelihood is reduced, which helps with maintenance.

Claims (2)

  1. 공장에서 생산하는 PC(Precasting) 암거의 바닥부의 단면 형상에 있어서 도1과 같이 인버터(역아치)형상을 이루는 구조를 한 것. In the cross-sectional shape of the bottom of the PC (Precasting) culvert produced in the factory, as shown in Figure 1 to form an inverter (reverse arch) shape.
    또한 도2와 같이 인버터 형상의 바닥과 PC암거의 수직벽체와의 사이에 급격한 단면변화를 감쇠하는 목적의 필렛 또는 쳄퍼를 한 경우에도 적용된다.In addition, as shown in Fig. 2, the same applies to the case where a fillet or chamfer for the purpose of attenuating a sudden cross-sectional change between the inverter-shaped floor and the vertical wall of the PC culvert.
  2. 전항에서 인버터형상의 반경이 유수폭의 0,75 - 2 배의 값인 바닥부를 형성하는 수로용 PC암거.A PC culvert for waterways that forms a bottom with a radius of 0,75-2 times the flow width in the preceding paragraph.
KR1020060014581A 2006-02-15 2006-02-15 The structure of precast concrete culvert KR20070082152A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020147550A1 (en) * 2019-01-14 2020-07-23 中国科学院、水利部成都山地灾害与环境研究所 Shaped cross-section test water chute design method and application thereof
WO2020244268A1 (en) * 2019-06-06 2020-12-10 福州大学 Variable cross-section pipe gallery structure suitable for rapid construction and construction method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020147550A1 (en) * 2019-01-14 2020-07-23 中国科学院、水利部成都山地灾害与环境研究所 Shaped cross-section test water chute design method and application thereof
WO2020244268A1 (en) * 2019-06-06 2020-12-10 福州大学 Variable cross-section pipe gallery structure suitable for rapid construction and construction method therefor

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