JP3454416B2 - Supply / exhaust device for overflow structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to discharge facilities (overflow weirs, overflow gates, head works, etc.), such as water intake facilities, discharge facilities, drainage facilities and dumping facilities. , A shut, a water discharge pipe, an orifice, a gate, a valve, etc.) for supplying and discharging air to and from an air reservoir formed downstream of the water discharge section. 2. Description of the Related Art Discharge facilities such as water intake facilities, discharge facilities, drainage facilities and spill facilities are provided with overflow structures (overflow weirs, overflow facilities, etc.) in which flowing water overflows and is discharged. Gay
Gutters, head works, shots, etc.) and water discharge structures (water discharge pipes, orifices, gates, valves, etc. in underflow facilities) through which water is discharged from the openings. In the overflow structure (overflow),
If the cross-sectional shape is a thin plate, for example, when formed by a steel plate, the overflow water flow becomes strip-like and separates from the back side (downstream side) of the overflow structure, and the falling water flow and the overflow structure A space is formed between the device and the back surface to create an air pocket. [0004] These air reservoirs have a negative pressure due to a flowing down water flow, or repeatedly contract and expand due to fluctuations in the water level downstream of the overflow structure, causing noise and unstable flow. It causes the negative pressure damage of the overflow structure. For this reason, a columnar projection called a spoiler as shown in FIG. 7 is provided at the top edge of the overflow structure with its upper end protruding above the water surface. It has been performed to form a cut that communicates with. Thereby, the air reservoir is opened to the outside through the break in the water flow, so that it is possible to prevent the air reservoir from becoming negative pressure or changing pressure. [0006] The illustrated spoiler 51 is formed by providing an L-shaped steel at the top (overflow portion) of a weir body 50 as a discharge facility so that its corner protrudes toward the upstream side to the upper side of the water surface. A plurality of such spoilers 51 are arranged at predetermined intervals in the weir length direction. On the other hand, in a water discharge structure (under flow), when the downstream side of the water discharge structure is a closed space such as a tunnel, the water discharged from the water discharge structure partially flows in the tunnel. May form an air pocket locally. [0008] These air reservoirs have a negative pressure or a high pressure due to a flowing down water flow, or repeatedly vibrate repeatedly contracting and expanding due to fluctuations in the water level in the tunnel, thereby causing noise and instability of water discharge. This may cause damage to the inner wall of the tunnel. For this reason, a vent pipe as shown in FIG. 8 is provided to connect the air reservoir in the tunnel with the outside of the tunnel to prevent negative pressure, high pressure and pressure change in the air reservoir. ing. [0010] When a spoiler as described above is provided in an overflow structure (overflow), a plurality of spoilers project along the overflow structure on the water surface. There is a problem that the landscape is spoiled, and driftwood or the like is caught by the spoiler, and a troublesome cleaning operation is required. In particular, in the case of a labyrinth weir having a triangular or trapezoidal planar shape at the top of the weir, which is bent so as to protrude alternately back and forth, a discontinuity corresponding to the bending of the overflow part is provided. (Independent air pockets are formed in each straight section of the overflow section.) Spoilers must be erected on each straight section, and as a result, a large number of spoilers are required. Therefore, there is a problem that the spoiler may impede the flow of water and even impair the function of the weir. [0012] [0013] The present invention was made in view to solve the above problems, in the overflow structure, Ku things to multiple projects arranged on the water surface of the spoiler, effective in air reservoir Air supply and exhaust to prevent negative pressure and vibration of the air pool, and overflow without impairing the landscape and the function of the discharge facility
An object of the present invention is to provide a supply / exhaust device for a structure . According to the present invention, there is provided an air supply / exhaust device for an overflow structure according to the present invention, which overflows an upper edge of a weir.
In the overflow structure to be discharged by discharging,
A supply / exhaust pipe member having a supply / exhaust hole on the downstream side is provided in the flow section.
The supply / exhaust pipe portion is provided integrally along the weir body;
The overflow structure in which the materials are arranged on the civil structures on the left and right of the channel
Through the air supply / exhaust passage opening above the water surface on the upstream side of the
It is characterized by being configured to communicate with the outside that does not sink . Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of an example of a configuration in which a supply / exhaust device of a discharge facility according to the present invention is applied to a labyrinth fixed dam which is a kind of overflow structure, and FIG.
FIG. 3 is a front view as viewed from the upstream side corresponding to the -A cross-sectional view, FIG. 3 is a rear view as viewed from the downstream side corresponding to the BB cross-sectional view of FIG. 1, and FIG. 4 is a CC cross-sectional view of FIG. . In the illustrated labyrinth fixed dam 1, a plate-shaped dam body 10 having a predetermined height as a discharge facility is provided between the left and right side walls 30R and 30L forming a flow path on the upstream and downstream sides in a plan view. It is formed so as to be bent and erected so as to form alternately protruding irregularities, so that water flowing over the overflow section 11 of the weir body 10 as a discharge facility flows from the upstream side to the downstream side. Is what it is. The weir body 10 is composed of an upstream weir body 10F or a downstream weir body 10A which is parallel to the direction in which the labyrinth fixed weir 1 extends, and which are oblique weir bodies 10A alternately arranged on the plane in reverse slope.
Connected by R, the planar shape is a triangular wave shape in which a trapezoid with a short upper base, such as a truncated apex of an isosceles triangle, is continuous at a predetermined pitch and the top is flattened. In this configuration example, the downstream-side weir body 10R includes the left and right side walls 30R, 30R.
L, and there are five convex portions toward the upstream side and four convex portions toward the downstream side. In such a labyrinth fixed weir 1, since its planar shape is a zigzag shape, the weir top length is longer than that of a linear weir that linearly closes the flow path. The discharge flow per hit can be increased. For this reason, the overflow width (flow channel width) can be reduced in comparison with a straight weir based on the discharge rate, and the overflow water depth can be reduced with the same overflow width, and the fluctuation of the overflow water level due to the increase and decrease of the inflow rate can be reduced. It can be kept small. The weir body 10 is provided on the upstream side of a frame 20 which horizontally supports an air supply / exhaust pipe 24 as an air supply / exhaust pipe member by a square pipe 22 and a shaped steel member 23 erected on the upper surface of a base 21. A skin plate 12 is stretched, and a flow regulating member 13 that forms the overflow portion 11 is provided on the upper surface of the supply / exhaust pipe 24. The flow regulating member 13 has a shape obtained by dividing a cylinder into quarters in the circumferential direction, and is fixed to the upper surface of the supply / exhaust pipe 24 with its peripheral surface facing upstream. The supply / exhaust pipe 24 is a square pipe having a square cross section, and its front surface (upstream surface) and the surface of the skin plate 12 are continuous on the same plane. Are smoothly continuous. That is, the upstream surface of the weir body 10 is formed to be flat and smooth. As shown in FIG. 5, which is a cross-sectional view taken along line DD of FIG. 2, the supply / exhaust pipe 24 has a plurality of supply / exhaust holes 24A having a predetermined pitch, a predetermined diameter, and a predetermined position. And both ends are shown in FIG.
As shown in FIG. 6, which is a cross-sectional view taken along line EE of FIG.
R, 30L of the air supply / exhaust passage 31 (31
R, 31L). The supply / exhaust passage 31 is formed vertically upward, and the top of the labyrinth fixed dam 1 (rectifying member 13
(The upper end of the water surface) and a position higher than the position obtained by adding the overflow water depth (that is, the water surface position) by a predetermined amount. An air supply / exhaust port member 31 bent in an L-shape is attached to the opening with the opening facing downward, thereby preventing intrusion of dust and the like into the air supply / exhaust passage 31. 31 is not blocked. In the labyrinth fixed dam 1 having the above structure, the supply / exhaust pipe 24 constituting the frame 20 and the supply / exhaust passage 3
1 constitutes a supply / exhaust device. In the air supply / exhaust device, the air supply / exhaust pipe 24 and the air supply / exhaust passage 31 communicate between the back side of the weir 10 and a position higher than the water surface position, thereby forming the air formed on the back side of the weir 10. Supply and exhaust to the pool are possible. Therefore, it is possible to prevent pressure change and vibration due to the negative pressure of the air reservoir and expansion / contraction of the air reservoir. The above configuration example is an application of the configuration of the present invention to a labyrinth fixed weir. However, the present invention is not limited to this, and other types of linear weirs, overflow type movable weirs, head works, shouts, etc. those may be applied to the overflow structure. Although the supply / exhaust pipe 24 serving as a supply / exhaust pipe member is used as a constituent member of the frame 20 of the weir body 10, it may be independently disposed on the back side of the weir body 10. , The supply / exhaust passage 31 is not necessarily the passage side wall 30R,
Need not be embedded in 30L, Ru der those may be provided a pipe-shaped dedicated path along the side wall. As described above, the overflow structure according to the present invention is used.
According to the air supply and exhaust system of the structure ,
A supply / exhaust pipe member having a supply / exhaust hole on the side extends along the weir body.
The supply / exhaust pipe member is provided integrally with the
Water surface on the upstream side of the overflow structure installed in the civil engineering structure
By being configured to communicate with the outside that is not submerged through the supply / exhaust passage that opens upward, it is formed downstream of the weir via the supply / exhaust passage and the supply / exhaust pipe member. <br/> enables supply and exhaust the air reservoir, spoilers and supply and exhaust passage
Providing multiple roads protruding above the water surface to prevent vibrations, noise, instability and damage to the air pool due to negative pressure, high pressure, and pressure change without impairing the landscape and the function of the discharge facility Can be done. [0032]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a configuration example in which a supply / exhaust device of a discharge facility according to the present invention is applied to a labyrinth fixed dam. FIG. 2 is a front view seen from the upstream side corresponding to the AA cross-sectional view of FIG. FIG. 3 is a rear view corresponding to a cross-sectional view taken along line BB of FIG. 1 and viewed from a downstream side. FIG. 4 is a sectional view taken along the line CC of FIG. 2; FIG. 5 is a sectional view taken along the line DD of FIG. 2; FIG. 6 is a sectional view taken along the line EE of FIG. 1; FIG. 7 is a perspective view showing a spoiler as a conventional example. FIG. 8 is a sectional view showing a vent pipe as a conventional example. [Description of Signs] 1 Labyrinth fixed weir (a kind of overflow structure) 10 Weir body (overflow structure) 11 Overflow part (upper edge overflow part) 24 Supply / exhaust pipe (supply / exhaust pipe member) 24A Supply / exhaust Hole 31 (31R, 31L) Supply / exhaust passage 30R, 30L Channel side wall (civil structure)

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 591073337 Marushima Aqua System Co., Ltd. 5-3-1-17, Tanimachi, Chuo-ku, Osaka-shi (74) The above three sub-agents 100070747 Patent Attorney Toru Sakamoto (2 other) (72) Inventor Naoto Tsuzumi 2-1-2 Kannondai, Tsukuba, Ibaraki Pref. Inside the Agricultural Engineering Laboratory, Ministry of Agriculture, Forestry and Fisheries (72) Inventor Takashi Kato 2-1-2 Kannondai, Tsukuba, Ibaraki Prefectural Ministry of Agriculture, Forestry and Fisheries In the laboratory (72) Norio Nakanishi 2-1-2 Kannondai, Tsukuba, Ibaraki Pref. Katsuya Hojo 2-8-45 Shibaya, Suminoe-ku, Osaka-shi, Osaka, Japan (72) Inventor Kozo Ude 5-3-17, Tanimachi, Chuo-ku, Osaka City, Osaka Prefecture Marushima Aqua System Co., Ltd. (56) References JP-A-58-131214 (JP, A) Jpn. JP, U) Jinsho 60-27149 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02B 7/02 E02B 7/52

Claims (1)

(57) [Claims] [Claim 1] Overflow structure that overflows the upper edge of a weir body and discharges it
A supply / exhaust hole provided on the upstream side of the weir body at the upstream edge of the weir body.
When the exhaust pipe member is provided integrally along the weir body,
The air supply / exhaust pipe members are disposed in civil structures on the left and right of the flow path.
Supply and discharge opening above the water surface on the upstream side of the overflow structure
An air supply / exhaust device for an overflow structure, wherein the air supply / exhaust device is configured to communicate with an outside that is not submerged through an air passage .