JP3454415B2 - Labyrinth fixed weir - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed weir having a labyrinth structure in which a plane shape of an overflow portion is formed to bend into an uneven shape projecting back and forth alternately. 2. Description of the Related Art Heretofore, there has been known a labyrinth weir in which the overflow section has a triangular or trapezoidal plane shape and is bent so as to protrude alternately back and forth. [0003] The labyrinth weir has a longer weir length than a straight weir that linearly closes the flow path, so that the discharge flow per unit overflow width 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. There are few practical applications of the fixed weir having such a labyrinth structure, and examples formed of reinforced concrete are seen only occasionally. [0005] However, when the labyrinth-fixing weir is made of concrete, since the top of the labyrinth is long and has a complicated shape, the work of arranging reinforcing bars and the installation of the formwork are troublesome. The structure requires a certain thickness, and as a result, there is a problem that the amount of concrete used is large, the construction period is long, the cost is high, and the discharge capacity is not so increased as compared with the straight weir. The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a labyrinth fixed weir that can be easily installed, can be installed in a short time, can be configured at low cost, and has a high discharge ability. Aim. A labyrinth-fixing weir according to the present invention for achieving the above object is a labyrinth weir in which at least an upper edge overflow portion is formed in a concave and convex shape protruding alternately back and forth, and comprises a plurality of units. Components are connected and arranged in the width direction of the flow path
The unit constituent member is provided on the upper surface of the base member,
Ventilation pipe member with vent holes on the downstream side is integrated along the upper edge
The weirs formed in a predetermined pitch of the irregularities
Is formed and connected in the flow channel width direction.
The weir body forms continuous irregularities and the vent pipe section
It is characterized in that the members are configured to communicate with each other. [0010] Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of a configuration example of a labyrinth fixed weir according to the present invention, and FIG.
1 is a partial front view seen from the upstream side corresponding to the A sectional view, and FIG. 3 is a partial rear view seen from the downstream side corresponding to the BB sectional view of FIG. In the illustrated labyrinth fixed dam 1, plate-shaped dams 10 having a predetermined height alternate between upstream and downstream sides in a plan view between left and right side walls 30 (30R, 30L) forming a flow path. The water flowing over the weir top 24 of the weir body 10 flows from the upstream side to the downstream side. . The weir body 10 is composed of an upstream weir body 10F or a downstream weir body 1B, which is an oblique weir body 10B alternately arranged on a plane with a reverse slope in parallel with the extending direction of the labyrinth fixed weir 10.
Connected by 0R, 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 is connected to the left and right side walls 30, and the number of convex portions toward the upstream side is five and the number of convex portions toward the downstream side is four. A rectifying member 24B having a shape obtained by dividing a cylinder into quarters in the circumferential direction on the upper surface of a supply / exhaust pipe 24A as a ventilation pipe member, as will be described in detail later , is provided on the weir top 24 of the weir body 10. The supply / exhaust pipe 24A communicates in the direction in which the labyrinth-fixed weir 1 extends (the weir width direction), and has a lower surface C in FIG.
As shown in FIG. 4 which is a cross-sectional view of FIG.
A plurality of openings C are formed at predetermined intervals in the longitudinal direction of the supply / exhaust pipe 24A, and both ends thereof are formed in a supply / exhaust passage 31 formed inside or along the flow path side wall 30 as shown in FIG. Connected. The supply / exhaust passage 31 is formed upward, and the top of the labyrinth fixed weir 10 (rectifying member 24B
(Upper end) and a position higher by a predetermined amount than the position obtained by adding the overflow water depth (ie, the water surface position). The labyrinth fixed weir 10 constructed as described above has a zigzag planar shape, so that the weir top length is longer than a straight weir that linearly closes the flow path.
Therefore, the discharge flow rate per unit overflow width 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. Further, since the flow regulating member 24B has an arc shape, the flow of the overflow water is made smooth and the discharge capacity is improved.
The cross-sectional shape of the overflow weir top (cross-sectional shape of the flow regulating member 24B) is not limited to a simple circular arc shape as in the present configuration example, but is a composite circle in which a small circular arc on the upstream side and a large circular arc on the downstream side are continuous. It may be formed in the shape of an arc or a lower edge of a water discharge vein from a blade-shaped claw or a shape similar thereto, so that the discharge performance can be further improved. Further, the back side of the dam body 10 and a position higher than the water surface position communicate with each other through the supply / exhaust pipe 24A and the supply / exhaust passage 31, so that the back surface of the weir body 10 and the overflow water are connected. Since ventilation is performed between the formed air reservoir and the outside, vibration and noise caused by expansion and contraction of the air reservoir and negative pressure in the air reservoir can be reduced. Here, the labyrinth fixed weir 1 has a single triangular convex shape (unit weir body 10A) projecting toward the upstream side of the weir body 10 as an integral unit constituent member 20. A plurality 20 (five in this configuration example) are juxtaposed and coupled in the flow channel width direction. Unit component 2
The division position of 0 is the center of the downstream weir 10R. As shown in FIG. 5, which is a perspective view seen from the upstream side, the unit component member 20 is a base member formed by stretching a steel plate on an upper surface of a base frame formed by combining rectangular steel sections with rectangular sections. A unit dam body 10A is provided on the upper surface of the base 21 as a base member.
Is erected. As shown in FIG. 6 which is a sectional view taken along line DD of FIG. 5, and FIG. 7 which is a sectional view taken along line EE of FIG. A skin plate 23 is stretched on the upstream side of the frame 22, and a pair of diagonal weirs 10B, which form two-dimensional gradients opposite to each other, an upstream weir 10F located at the intersection thereof, and a pair of diagonal weirs 10B. A half-length downstream weir 10R located at the downstream end
Are continuously integrated. The weir body frame 22 is provided with a vertical structural member (square pipe 22B, square pipe 22B) on the upper side of a grooved steel base material 22A disposed along the weir arrangement path on the upper surface of the base 21 with the open side facing upward. Channel steels 22C, 22D) are erected, and are formed to support the weir top 24 with these vertical structural members 22B, 22C, 22D. The square pipe 22B, which is a vertical structural member, is disposed at a position corresponding to the upstream weir body 10F.
C and 22D are disposed inside (downstream side) of the oblique weir body 10B and at side ends of the downstream weir body 10R. Channel steel 22C
Is provided with its side surface facing outward, and the grooved steel 22D is provided with the open side facing inward (back surface facing outward). The weir top 24 is provided with a supply / exhaust pipe 24A made of a square pipe having a square cross section along the weir body 10, and a rectifying member 24B is fixed on the upper surface thereof. The edge and the front surface (upstream surface) of the supply / exhaust pipe 24A are aligned and smoothly continuous. The skin plate 23 is stretched upstream of the base material 22A and the vertical structural members 22B, 22C, 22D, and the surface thereof and the front surface of the supply / exhaust pipe 24A coincide. The unit component member 20 having the above-described structure includes a base 21
The outer end surfaces of the downstream weirs 10R (the back surfaces of the grooved steels 22D) are aligned and aligned, and the bases 21 are fastened to each other with bolts via the joining plates 41 as shown in FIGS. , A groove steel 22 forming the end face of the downstream weir 10R
D can be fastened together by bolts, and furthermore, the butting portions of the skin plate 23 and the weir top 24 can be joined by joining by watertight welding, thus connecting an arbitrary number of unit component members 20. Thus, a labyrinth weir having an arbitrary weir width can be formed. The labyrinth fixed weir 1 shown in FIGS. 1 to 3 is an example in which five unit constituent members 20 are connected in this manner. The labyrinth-fixing weir 1 formed by connecting an arbitrary number of unit components 20 to the flow path is installed in the flow path beforehand by forming the side wall 30 and the labyrinth weir of the flow path at the site where the labyrinth weir is installed. A concrete placing space 33 is formed on the lower surface, a reinforcing bar 34 is protruded at a predetermined position, the unit constituent members 20 are sequentially carried in, and the base 21 is fixed by an anchor bolt 35 connected to the reinforcing bar 34. The adjacent unit constituent members 20 are connected as described above, and concrete is filled and poured into the concrete placing space 33. In addition, the connection between the unit component member 20 and the side wall 30 at the flow path side end is performed by fastening and fixing a side wall plate 40 made of a steel plate to the side surface of the unit component member 20 by welding and implanting the inside of the side wall plate 40. Coupling wire 4
After welding and fixing 0A and the reinforcing bars 34 projecting into the concrete casting space 33, the concrete can be filled and poured into the concrete placing space 33 on the side of the side wall plate 40. As described above, in the labyrinth fixed weir 1 constructed by connecting the unit components 20 formed of steel plates, the required number of the unit components 20 manufactured in the factory are transported and connected to the construction site. This makes it possible to cope with an arbitrary weir length, is easy to install, can be installed in a short time, and can be configured at low cost because the unit component member 20 is versatile. . In the above-described configuration example, the unit component member 20 is formed as a single pitch projecting toward the upstream of the weir 10, but the orientation may be either upstream or downstream, and the pitch can be set arbitrarily. It is something. The labyrinth-fixing weir 1 formed by connecting the unit constituent members 20 may have a triangular wave shape with a flattened top as in the above-mentioned configuration example, as long as the labyrinth-fixing weir 1 is formed in an uneven shape projecting back and forth alternately. The shape is not limited to a sawtooth wave, which is a complete triangular wave, a rectangular wave, a shape in which the corners are arc-shaped, or a sine wave that is continuous with a curve, and may be appropriately changed. It is. Oblique weir body 10B
May be different between the left and right oblique weirs. The weir body itself does not need to be vertically upright, and may be partially or entirely inclined. Further, although the skin plate 23 is stretched over the weir frame 22 in the above configuration example, a shape without the weir frame may be used depending on the required degree of upstream water pressure and water stoppage. Further, the base 21 may not be a base frame, but may be constituted only by an upper surface portion thereof. A steel reinforced concrete manufactured by a factory may be used instead of steel. As described above, according to the labyrinth-fixing weir of the present invention, a plurality of unit components are arranged in the channel width direction.
The unit constituent member is a base member
On the upper surface, a ventilation pipe member having a ventilation hole on the downstream side
A weir body integrally formed along the predetermined pitch of the irregularities
And formed in an upright manner, and connected in the flow channel width direction.
The dam body forms continuous irregularities,
Since the ventilation pipe members are configured to communicate with each other, the required number of unit components manufactured at the factory can be conveyed to the construction site and connected to the construction site, so that it can be adapted to any weir length, facilitating construction. In addition to being able to be installed in a short period of time and configured at low cost, ventilation between the back surface of the labyrinth fixed weir and overflow water is performed through a ventilation pipe member communicating each unit component, thereby expanding the air reservoir. -Vibration and noise caused by shrinkage can be prevented. [0033]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a configuration example of a labyrinth fixed dam according to the present invention. 2 is a partial front view seen from the upstream side corresponding to the AA cross-sectional view of FIG. 1; FIG. 3 is a partial rear view seen from the downstream side corresponding to the BB cross-sectional view of FIG. 1; FIG. 4 is a sectional view taken along the line CC of FIG. 3; FIG. 5 is a perspective view of a unit component viewed from an upstream side. FIG. 6 is a sectional view taken along line DD of FIG. 5; FIG. 7 is a sectional view taken along the line EE of FIG. 6; [Description of Signs] 1 Labyrinth fixed weir 10 Weir body 10A Unit weir body 20 Unit constituent member 21 Base (base member) 24 Weir top part (upper edge overflow part) 24A Supply / exhaust pipe (vent pipe member) 24C Vent hole

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Naoto Tsuzumi 2-1-2 Kannondai, Tsukuba, Ibaraki Prefecture Within the Agricultural Engineering Research Institute, Ministry of Agriculture, Forestry and Fisheries (72) Inventor Takashi Kato 2-1-2 Kannondai, Tsukuba, Ibaraki Prefecture 2 Agricultural Engineering Research Institute, Ministry of Agriculture, Forestry and Fisheries (72) Norio Nakanishi 2-1-2 Kannondai, Tsukuba, Ibaraki Prefecture In-house Research Institute for Agricultural Engineering, Ministry of Agriculture, Forestry and Fisheries (72) Mitsutoshi Goto 3-1-1 Toyosu, Koto-ku, Tokyo No. 15 Ishikawa Shima Harima Heavy Industries Co., Ltd. Tojin Technical Center (72) Inventor Katsuya Hojo 2-45 Shibuya, Suminoe-ku, Osaka City, Osaka Prefecture Kurimoto Ironworks Co., Ltd. Sumiyoshi Plant (72) Inventor Kozo Ide 5-3-17 Tanimachi, Chuo-ku, Osaka-shi, Osaka Inside Marushima Aqua System Co., Ltd. (56) References JP-A-56-55613 (JP, A) 60-27149 (JP, Y2) (58 ) investigated the field (Int.Cl. ^7, DB name) E02B 7/02 E02B 7/52

Claims (1)

(1) A labyrinth weir in which at least an upper edge overflowing portion is formed in a concave and convex shape so as to protrude alternately back and forth, wherein a plurality of unit constituent members are provided. It is connected and arranged in the width direction of the
In addition, the unit constituent member ventilates on the upper surface of the base member and on the downstream side.
A vent tube member having a hole is integrally formed along the upper edge.
Weirs are formed upright with a predetermined pitch of the irregularities
The dam is connected in the width direction of the flow path to connect the weir body.
Forming a continuous unevenness and communicating with the vent pipe member
Labyrinth fixed weir, characterized in that it is configured to.