JP3856370B2 - Box-type reinforcement structure of branch pipe - Google Patents

Description

【００３７】
図３及び図４に示すシミュレーション結果より、本実施例の箱型の補強桁Ｐを用いた場合でも、著しい応力増加のないことが確認できる。すなわち、本発明による補強桁Ｐは、側板１ａ、１ｂ、内フランジ２、外フランジ３により箱型に形成し、その内部にコンクリート４を打設したものであるが、分岐管の強度を低下させることはないものである。そして、本発明では、極めて厚い鋼板を用いることなく補強桁Ｐを製作できるので、大口径で流体圧の高い水圧管路に使用するときでも、水圧管路の口径に合致する大型の補強桁Ｐを容易に低コストで製造することができる。
【００３８】
【発明の効果】
以上説明したように、本発明の分岐管の補強構造では、補強桁を、鋼材で形成された一対の三日月状の側板と、この側板の各内周円弧間に取付けた内フランジと、前記側板の各外周円弧間に取付けた外フランジにより箱型に形成し、その内部にコンクリートを打設した構成としたので、補強桁の製造コストを低減することができる。また、補強桁を大型化することができるので、大口径で流体圧の高い水圧管路でも使用できる十分な強度が得られる。
【図面の簡単な説明】
【図１】（ａ）は、本発明において使用する補強桁の縦断面を、（ｂ）は、（ａ）におけるＡ−Ａ’断面を表した図である。
【図２】（ａ）は、本発明の分岐管の補強構造を縦及び横方向に切断した状態を、（ｂ）は、軸に水平方向の中央縦断面を表した図である。
【図３】分岐管に対して一定の内水圧をかけた場合に、分岐管の内表面に生じる応力のシミュレーション結果を表したもので、（ａ）は従来例における結果を、（ｂ）は本実施例における結果を表した図である。
【図４】分岐管に対して一定の内水圧をかけた場合に、分岐管の外表面に生じる応力のシミュレーション結果を表したもので、（ａ）は従来例における結果を、（ｂ）は本実施例における結果を表した図である。
【図５】従来の分岐管の補強構造の一例を表した図である。
【図６】従来の分岐管の補強構造の他の一例を表した図である。
【符号の説明】
Ｐ 補強桁
１ａ、１ｂ 側板
２ 内フランジ
３ 外フランジ
４ コンクリート
５ 垂直連結桁
６ 水平連結桁
７ 主管
８、９ 枝管
８ａ、９ａ 円筒状の枝管片
８ｂ、８ｃ、８ｄ、８ｅ 裁頭円錐状の枝管片
９ｂ、９ｃ、９ｄ、９ｅ 裁頭円錐状の枝管片
ｆ フェースプレート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch pipe reinforcement structure used in a hydraulic pipeline such as a hydroelectric power generation facility, and more particularly to a branch pipe reinforcement structure suitable for a case where the hydraulic pipeline has a large diameter and high fluid pressure. .
[0002]
[Prior art]
In a hydraulic pipe such as a hydroelectric power generation facility, a branch pipe in which a plurality of branch pipes are joined to one main pipe is used in order to branch or join the pipes. Such a branch pipe is constructed by joining several pipe parts. However, since strong fluid pressure is applied to the joint part of the part where adjacent branch pipes cross each other, there is some It is necessary to provide a reinforcing structure.
[0003]
On the other hand, in the above-described branch pipe, it is also required to reduce the energy loss of the fluid generated at the branch portion as much as possible. For example, for branch pipes that are used for both branching and merging, such as a hydraulic pipe of a pumped storage power plant, it is necessary to reduce energy loss in any case.
[0004]
In view of this, various branch pipe reinforcement structures have been proposed that reduce the energy loss of the fluid as much as possible and give the above-mentioned intersections the necessary strength. As an example of the prior art, as described in Japanese Patent Publication No. 36-10880, a crescent-shaped reinforcing girder is provided.
[0005]
FIG. 5 is a view for explaining the “pressure branch pipe branching piece” described in Japanese Patent Publication No. 36-10880, wherein (a) shows a horizontal central longitudinal section on the shaft, and (b) shows the shaft. It represents a central longitudinal section in the vertical direction.
In this conventional reinforcing structure, as shown in FIGS. 5A and 5B, the main pipe A1 is formed by joining a cylindrical main pipe piece A1a and truncated cone-shaped main pipe pieces A1b and A1c. Yes. Further, one branch pipe A2 joined to the main pipe A1 is formed by joining a cylindrical branch pipe piece A2a and a truncated conical branch pipe piece A2b, A2c, A2d without any step, The branch pipe A3 is also formed by joining a cylindrical branch pipe piece A3a and a truncated conical branch pipe piece A3b, A3c, A3d without any step.
[0006]
An outer circumferential arc portion A6a of a crescent-shaped reinforcing beam A6 is joined to the intersection A5 of the branch pipe pieces A2d and A3d. Further, the inner circumferential arc portion A6b of the reinforcing beam A6 protrudes into the branch pipe, and both ends thereof are at both ends of the intersection portion A5, that is, the joint A7 of the three parts of the main pipe A1 and the two branch pipes A2 and A3. Has reached.
[0007]
Further, subdividing the truncated cone-shaped branch pipe pieces A2d and A3d shown in FIG. 5 and making the reinforcing beam A6 small is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-287378. It is in place. 6A and 6B are diagrams for explaining a “branch pipe” described in Japanese Patent Application Laid-Open No. 11-287378, in which FIG. 6A is a central longitudinal section in a horizontal direction on an axis, and FIG. 6B is a central longitudinal section in a direction perpendicular to the axis. Represents a surface.
[0008]
That is, in the conventional reinforcing structure disclosed in the above publication, as shown in FIGS. 6A and 6B, the branch pipe piece B2d is connected to the truncated cone-shaped branch pipe pieces B2d1 and B2d2 and the branch pipe piece. B3d is subdivided into frustoconical branch pipe pieces B3d1 and B3d2, and the crescent-shaped reinforcing beam B6 is smaller than the reinforcing beam A6 in FIG. 5 described above.
[0009]
The outer circumferential arc B6a of the reinforcing beam B6 is joined only to the intersection B51 of the branch pipe pieces B2d1 and B3d1, and does not reach the intersection B52 of the branch pipe pieces B2d2 and B3d2. Further, both ends of the inner circumferential arc B6b of the reinforcing beam B6 protruding into the branch pipe only reach the vicinity of both ends of the intersection B51, and are not extended toward the intersection B52.
[0010]
[Problems to be solved by the invention]
However, the conventional branch pipe reinforcing structure described above has the following problems when the hydraulic line has a large diameter and a high fluid pressure.
First, for example, in the conventional reinforcing structure shown in FIG. 5, the crescent-shaped reinforcing beam A6 is provided at the intersection A5 of the truncated cone-shaped branch pipe pieces A2d and A3d of the two adjacent branch pipes A2 and A3. And the junction location reaches the junction location A7 of the three of the main pipe A1 and the branch pipes A2 and A3. Therefore, when the hydraulic pipeline has a large diameter, the overall size of the reinforcing beam, including the thickness, becomes extremely large. There was a problem of worsening the nature.
[0011]
On the other hand, in the case of the conventional reinforcing structure shown in FIG. 6, for example, the reinforcing girder B6 is miniaturized. However, when this is used for a hydraulic pipe having a large diameter and high fluid pressure, the strength of the reinforcing girder B6 is low. However, there is a problem that the branch pipe may be broken due to high stress. In order to increase the strength, it is necessary to make the thickness of the reinforcing beam B6 thicker than that of the conventional reinforcing structure shown in FIGS. In order to manufacture the reinforcing girder B6 by processing the material, special materials and processing techniques are required, which is problematic in terms of workability and manufacturing cost.
[0012]
The present invention has been made in view of the problems seen in the above-described conventional reinforcing structure, and even when used in a hydraulic line having a large diameter and high fluid pressure, it is sufficient without using a very thick steel plate. An object of the present invention is to provide a reinforcing structure for a branch pipe that can provide strength and can reduce the manufacturing cost.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a reinforcing structure for a branch pipe according to the present invention comprises one main pipe and a plurality of branch pipes joined to the main pipe. The branch pipe has a cylindrical branch pipe piece and a truncated face. A crescent moon formed at the intersection of the truncated cone-shaped branch pipe piece of one branch pipe and the truncated cone-shaped branch pipe piece of the other branch pipe adjacent thereto formed by joining conical branch pipe pieces. In the reinforcing structure of the branch pipe provided with the shape-like reinforcing girder, the reinforcing girder includes a pair of crescent-shaped side plates made of steel, an inner flange attached between the inner peripheral arcs of the side plates, and the side plates It was formed into a box shape with outer flanges attached between the outer peripheral arcs, and concrete was placed inside.
[0014]
Since the reinforcing girder having such a configuration is used, the reinforcing structure of the branch pipe according to the present invention has sufficient strength to withstand even when used in a hydraulic pipe line having a large diameter and high fluid pressure, and is manufactured. Cost can be reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The reinforcing structure for a branch pipe according to the present invention includes a main pipe and a plurality of branch pipes joined to the main pipe. The branch pipe joins a cylindrical branch pipe piece and a truncated conical branch pipe piece. A branch pipe having a crescent-shaped reinforcing girder formed at the intersection of the truncated cone-shaped branch pipe piece of the one branch pipe and the truncated cone-shaped branch pipe piece of the other branch pipe adjacent thereto In this reinforcing structure, the reinforcing girder includes a pair of crescent-shaped side plates formed of steel, an inner flange attached between the inner peripheral arcs of the side plate, and an outer flange attached between the outer peripheral arcs of the side plate. Is formed into a box shape, and concrete is placed therein.
[0016]
According to the reinforcing structure of a branch pipe of the present invention, sufficient strength that can be used even with a large-diameter hydraulic pipe line can be obtained by using a box-type reinforcing girder formed of steel and concrete. Therefore, there is no need to process a very thick steel plate to manufacture a reinforcing beam, and the manufacturing cost can be reduced.
[0017]
In the branch pipe reinforcing structure of the present invention, the internal structure of the reinforcing beam formed in a box shape is not particularly limited.
However, since strong fluid pressure is applied to the reinforcement beam part, it is necessary to provide some reinforcement structure inside the reinforcement beam when it is predicted that the fluid pressure cannot be withstood only by the box structure. is there.
[0018]
Therefore, in the reinforcing structure for a branch pipe according to the present invention, for example, it is more desirable to dispose a vertical connecting girder between a pair of side plates, and further dispose a horizontal connecting girder in a direction perpendicular to the vertical connecting girder. This is because the strength of the reinforcing girder having a box structure is further improved.
[0019]
In the branch pipe reinforcing structure of the present invention, the shape of the inner flange and the ratio of the width of the outer flange to the width of the inner flange are not particularly limited.
However, in the branch pipe used as the hydraulic pipe line, it is necessary to reduce the energy loss of the fluid generated in the branch portion as much as possible. Therefore, the shape of the reinforcing beam also needs to have good hydraulic characteristics.
[0020]
Therefore, in the reinforcing structure for a branch pipe according to the present invention, the shape of the inner flange has an arc-shaped cross section protruding to the outer surface side, and the width of the inner flange is made smaller than the width of the outer flange. Is more desirable. In this way, the shape of the reinforcing girder is tapered from the branch pipe side to the main pipe side, so the hydraulic performance of the reinforcing girder is improved and the energy loss of the fluid can be suppressed as much as possible. is there.
[0021]
In the reinforcing structure for a branch pipe according to the present invention, it is more preferable to provide a dowel or a stud on the inner surface of the side plate, the inner flange and the outer flange, and on the surfaces of the vertical and horizontal connection beams. This is because by providing such protrusions, the adhesion between the placed concrete and each of the above-described components is increased, and the strength of the reinforcing beam is improved.
[0022]
In addition, when the vertical connection beam is provided as described above, it is more preferable to attach a face plate to one end of the vertical connection beam in advance. By doing so, the face plate and the side plate can be joined by slot welding when attaching the other side plate after attaching the vertical connecting girder to one side plate, so that the workability is improved. For the same reason, it is desirable to attach the face plate even when a horizontal connection girder is provided.
[0023]
【Example】
Embodiments of the present invention will be described below with reference to the accompanying drawings shown in FIGS.
1A is a longitudinal cross-sectional view of a reinforcing girder used in the present invention, FIG. 1B is a view showing a cross section AA ′ in FIG. 1A, and FIG. 2A is a branch pipe of the present invention. Fig. 3B shows a state in which the box-type reinforcing structure is cut in the vertical and horizontal directions, (b) is a diagram showing a central longitudinal section in the horizontal direction on the shaft, and Fig. 3 shows a constant internal water pressure applied to the branch pipe. FIG. 4 shows a simulation result of stress generated on the inner surface of the branch pipe, (a) shows the result in the conventional example, (b) shows the result in the present embodiment, and FIG. 4 shows the branch pipe. The results of the simulation of the stress generated on the outer surface of the branch pipe when a constant internal water pressure is applied to the pipe are shown in (a) with the results in the conventional example and (b) with the results in the present embodiment. FIG.
[0024]
As shown in FIGS. 1 (a) and 1 (b), the reinforcing girder P of this embodiment is attached between crescent-shaped side plates 1a and 1b formed of steel and inner circumferential arcs of the side plates 1a and 1b. The inner flange 2 and the outer flange 3 attached between the outer peripheral arcs of the side plates 1a and 1b are formed in a box shape. As shown in FIG. 1A, the inner flange 2 and the outer flange 3 are arc-shaped members, and both ends 2 a and 2 b of the inner flange 2 are joined to both ends 3 a and 3 b of the outer flange 3. And concrete 4 is laid in the inside of the reinforcement girder P formed in this box shape.
[0025]
In this embodiment, as shown in FIG. 1 (b), the vertical connecting girder is located at a total of three positions connecting the points 1a1, 1a2, 1a3 on the side plate 1a and the points 1b1, 1b2, 1b3 on the side plate 1b. 5 is disposed. As shown in FIG. 1A, the vertical connecting girder 5 extends in the vertical direction and is also joined to points 3a1 / 3b1, 3a2 / 3b2, and 3a3 / 3b3 on the outer flange 3. Furthermore, in the present embodiment, the horizontal connecting girder 6 is disposed at a height position connecting the intermediate point 2c of the inner flange 2 and the intermediate point 3c of the outer flange 3.
[0026]
In the reinforcing structure of the branch pipe of the present embodiment, as described above, since the vertical connecting girder 5 and the horizontal connecting girder 6 are disposed inside the reinforcing girder P, the strength of the reinforcing girder P formed in a box shape is: This will be further improved.
[0027]
Although not shown, for example, studs are provided on the inner surfaces of the side plates 1a and 1b, the inner flange 2 and the outer flange 3, and the surfaces of the vertical connecting girder 5 and the horizontal connecting girder 6. By providing such a protrusion, the adhesion between the placed concrete 4 and each of the above constituent members is increased, and therefore the strength of the reinforcing beam P is further improved.
[0028]
In this embodiment, when manufacturing the reinforcing beam P, a face plate f as shown in FIG. 1B is attached to one end of the vertical connecting beam 5 in advance. As described above, in this embodiment, the face plate f and the side plate 1b can be joined by slot welding when the side plate 1b is attached after the vertical connection beam 5 is attached to the side plate 1a, and the workability is good. Become. Although not shown, a similar face plate is attached to one end of the horizontal connection beam 6.
[0029]
As shown in FIGS. 2A and 2B, the branch pipe of this embodiment is obtained by joining two branch pipes 8 and 9 having a smaller diameter than the main pipe 7. The main pipe 7 is formed by joining a cylindrical main pipe piece 7a and a truncated conical main pipe piece 7b, 7c without any step. One branch pipe 8 joined to the main pipe 7 is formed by joining a cylindrical branch pipe piece 8a and a truncated conical branch pipe piece 8b, 8c, 8d, 8e without any step. The other branch pipe 9 is also formed by joining a cylindrical branch pipe piece 9a and a truncated cone-shaped branch pipe piece 9b, 9c, 9d, 9e without any step.
[0030]
Since it did in this way, in the box-type reinforcement structure of a present Example, the diameter of a pipe | tube increases gradually as it approaches the branch point of the branch pipes 8 and 9 from the main pipe 7 side. Accordingly, in any case, the direction change angle of the flow path is gentle from the main pipe 7 to the branch pipes 8 and 9 in the case of the diversion and from the branch pipes 8 and 9 to the main pipe 7 in the case of the merge. Thus, the direction change of the fluid can be smoothly achieved. The outer flange 3 of the reinforcing girder P formed in the above-described box shape includes the truncated cone-shaped branch pipe pieces 8c, 8d, and 8e of the branch pipe 8, and the truncated cone-shaped branch pipe piece of the branch pipe 9. It is joined to each intersection of 9c, 9d, 9e.
[0031]
As shown in FIGS. 2 (a) and 2 (b), the reinforcing beam P used in the present invention has a wider width in the lateral direction than a conventional reinforcing beam. However, in the present invention, as described above, the reinforcing girder P is formed in a box shape by the side plates 1a, 1b, the inner flange 2, and the outer flange 3, and the concrete 4 is placed therein. No material or processing technology is required, and the manufacturing cost can be reduced.
[0032]
In the present embodiment, the inner flange 2 is formed of, for example, a half pipe, and the cross-sectional shape thereof is an arc shape protruding toward the outer surface side of the inner flange 2 as shown in FIG. It is trying to become. Furthermore, in this embodiment, as shown in FIG. 1B, the width of the inner flange 2 is made smaller than the width of the outer flange 3.
[0033]
In this embodiment, the shape of the inner flange 2 is provided with an arc-shaped cross section protruding to the outer surface side, and the width of the inner flange 2 is made narrower than the width of the outer flange 3. As shown in (b), the shape of the reinforcing beam P is tapered from the branch pipes 8 and 9 side toward the main pipe 7 side. Therefore, in this embodiment, the hydraulic performance of the reinforcing beam P is improved, and the energy loss of the fluid can be suppressed as much as possible.
[0034]
FIG. 3A shows that a constant internal water pressure (0.409014 kgf / mm ² ) corresponding to the steady use state acts on the inner surfaces of the main pipe 70 and the branch pipe 80 using a conventional branch pipe reinforcement structure. The Von Mises equivalent stress produced is represented by FEM simulation results, and FIG. 3B represents the simulation results when the box-type reinforcing structure of this example is used.
[0035]
FIG. 4A shows the result of FEM simulation of the Von Mises equivalent stress generated on the outer surfaces of the main pipe 70 and the branch pipe 80 using the conventional reinforcing structure of the branch pipe under the same conditions as described above. FIG. 4B shows the simulation result when the box-type reinforcing structure of this example is used.
In the stress contour shown in FIG. 3 and FIG. 4, the regions A to H surrounded by the solid line represent the stress in the range shown in Table 1 below.
[0036]
[Table 1]

[0037]
From the simulation results shown in FIGS. 3 and 4, it can be confirmed that there is no significant increase in stress even when the box-shaped reinforcing girder P of the present embodiment is used. That is, the reinforcing girder P according to the present invention is formed in a box shape by the side plates 1a, 1b, the inner flange 2, and the outer flange 3, and the concrete 4 is placed therein, but the strength of the branch pipe is reduced. There is nothing to do. And in this invention, since the reinforcement girder P can be manufactured without using a very thick steel plate, even when using it for the hydraulic pipe line with a large diameter and high fluid pressure, the large-sized reinforcement girder P that matches the diameter of the hydraulic pipe line Can be easily manufactured at low cost.
[0038]
【The invention's effect】
As described above, in the reinforcing structure for a branch pipe according to the present invention, a reinforcing girder includes a pair of crescent-shaped side plates formed of steel, an inner flange attached between the inner peripheral arcs of the side plates, and the side plates. Since the outer flange attached between the outer peripheral arcs is formed into a box shape and concrete is placed therein, the manufacturing cost of the reinforcing girder can be reduced. Further, since the reinforcing girders can be enlarged, a sufficient strength that can be used even in a hydraulic pipe line having a large diameter and high fluid pressure can be obtained.
[Brief description of the drawings]
FIG. 1A is a longitudinal cross-sectional view of a reinforcing beam used in the present invention, and FIG. 1B is a view showing an AA ′ cross-section in FIG.
2A is a diagram showing a state in which a reinforcing structure for a branch pipe according to the present invention is cut in a vertical and horizontal direction, and FIG. 2B is a diagram showing a central longitudinal section in a horizontal direction about an axis.
FIG. 3 shows a simulation result of stress generated on the inner surface of a branch pipe when a constant internal water pressure is applied to the branch pipe. (A) shows the result in the conventional example, (b) shows It is a figure showing the result in a present Example.
4A and 4B show simulation results of stress generated on the outer surface of a branch pipe when a constant internal water pressure is applied to the branch pipe. FIG. 4A shows the result in the conventional example, and FIG. It is a figure showing the result in a present Example.
FIG. 5 is a diagram showing an example of a reinforcing structure of a conventional branch pipe.
FIG. 6 is a view showing another example of a conventional reinforcing structure of a branch pipe.
[Explanation of symbols]
P Reinforcement beam 1a, 1b Side plate 2 Inner flange 3 Outer flange 4 Concrete 5 Vertical connection beam 6 Horizontal connection beam 7 Main tube 8, 9 Branch tube 8a, 9a Cylindrical branch tube pieces 8b, 8c, 8d, 8e Branch pipe pieces 9b, 9c, 9d, 9e frustoconical branch pipe pieces f faceplate

Claims (5)

It is composed of one main pipe and a plurality of branch pipes joined to the main pipe. The branch pipe is formed by joining a cylindrical branch pipe piece and a truncated conical branch pipe piece. In the reinforcing structure of a branch pipe in which a crescent-shaped reinforcing girder is provided at the intersection of a frustoconical branch pipe piece and a frustoconical branch pipe piece of another branch pipe adjacent thereto, A pair of crescent-shaped side plates made of steel, an inner flange attached between the inner peripheral arcs of the side plate, and an outer flange attached between the outer peripheral arcs of the side plate are formed into a box shape, A box-type reinforcing structure for branch pipes, characterized by placing concrete. 2. A box-type reinforcing structure for a branch pipe according to claim 1, wherein a vertical connecting girder and a horizontal connecting girder are disposed inside the reinforcing girder. The branch pipe according to claim 1 or 2, wherein the inner flange has an arc-shaped cross section projecting to the outer surface side, and the width thereof is narrower than the width of the outer flange. Box-type reinforcement structure. The gibber or the stud is provided in the inner surface of the said side plate, the said inner flange, the said outer flange, and the surface of the said vertical connection beam and the said horizontal connection beam, The Claim 1 thru | or 3 characterized by the above-mentioned. Box-type reinforcement structure for branch pipes. The box-type branch pipe according to any one of claims 2 to 4, wherein a face plate is attached to one end of the vertical connection beam and the horizontal connection beam, and the face plate and the side plate are joined by slot welding. Reinforced structure.

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