JP6182336B2 - Waterway lining structure - Google Patents

Description

  The present invention relates to a lining structure for protecting a water channel such as a sand discharge channel of a water intake dam.

  If the channel floor of a waterway in the mountainous area, such as a sand discharge channel of a water intake dam, is made of concrete, the surface of the roadbed will be worn out by continuing to be exposed to the impact of earth and sand flowing along with the water, and the life of the roadbed will be reduced. It becomes extremely shorter than the peripheral members. In addition, it is not easy to repair a worn roadbed. For this reason, when a water channel is newly established or renewed, a lining structure is generally laid to protect the water channel by covering the floor surface of the water channel with a metal plate-like lining member (see, for example, Patent Document 1).

  This lining structure is usually composed of a plurality of plate-like lining members, and a plurality of strip-like lining blocks extending in the water channel width direction with a constant water flow direction dimension are continuously arranged in the water flow direction. And as the plate-shaped lining member, a member manufactured by casting and provided with a leg for fixing on the back surface is often used.

JP 2003-278135 A

  By the way, in the water channel in which the lining structure as described above is laid, there is a channel having a trapezoidal portion whose width dimension changes in a constant ratio in the water flow direction in addition to the straight portion (a portion whose width dimension is constant in the water flow direction). is there.

  The lining block of the straight section of the water channel has a width dimension different from that of the rectangular lining member constituting this column on both sides or one side of the column in which the same type of lining members having a rectangular shape (square or rectangular) are arranged in the channel width direction. The rectangular lining members are arranged so as to fill between the edge of the row and the side surface of the water channel. At this time, the rectangular lining members arranged in the water channel width direction and the rectangular lining members arranged at the end of the lining block are respectively of the same type in the entire lining structure, so that the manufacturing cost is suppressed.

  On the other hand, the trapezoidal lining block of the water channel has a trapezoidal lining member arranged on both sides of the row of rectangular lining members arranged in the width direction of the channel, and a space between the row of rectangular lining members and the side surface of the water channel. I try to fill it. The trapezoidal lining members are usually arranged on the same side in the waterway width direction for each lining block, but the widthwise dimensions are different one by one, and the back is provided with legs, so both sides in the waterway width direction It is also impossible to use the same type with the front and back reversed.

  For this reason, when a lining structure is laid in a water channel having a trapezoidal portion, a large number of types of molds are required when manufacturing a trapezoidal lining member, resulting in a problem that the manufacturing cost becomes very high.

  Accordingly, an object of the present invention is to reduce the manufacturing cost by reducing the types of trapezoidal lining members in the trapezoidal channel lining structure.

  In order to solve the above-mentioned problems, the present invention is arranged in a trapezoidal water channel in which the width dimension changes in the water flow direction and the water flows biased toward one end side of the width direction, and the rectangular shape is arranged in the water channel width direction. A plurality of rectangular lining members and two trapezoidal lining members having a trapezoidal planar shape that fills the space between both ends of the row of the rectangular lining members and the side surface of the water channel, and has a constant water flow direction dimension and a water channel width direction. In the lining structure of a water channel in which a plurality of strip-shaped lining blocks extending in the direction of the water channel are continuously arranged so as to cover the floor surface of the water channel, at least one of the lining blocks is arranged at one end side in the water channel width direction. The widthwise dimensions of the trapezoidal lining members on both sides are set so that the gap between the trapezoidal lining member and the side surface of the waterway is smaller than the gap between the trapezoidal lining member on the other end side and the side surface of the waterway. Adopted the boss was constructed.

  That is, the inventor of the present application often has a trapezoidal water channel provided as a sand discharge channel or the like of a water intake dam. Paying attention to the fact that the floor is less likely to be damaged by sediment collision than one end side, and at least one of the lining blocks, the gap between the trapezoidal lining member on the other end side and the side of the water channel is somewhat wider than the one end side. By allowing this to happen, a plurality of trapezoidal lining members of the same type can be used between the respective lining blocks, and the number of types of trapezoidal lining members can be reduced.

Here, when the water channel is formed in an isosceles trapezoidal shape, the plurality of rectangular lining members of the lining blocks are arranged symmetrically with respect to the center of the water channel width direction, and at least one of the lining blocks is arranged. Therefore, it can be set as the trapezoid lining member of the one end side of a water channel width direction which has a larger dimension in the width direction than the trapezoid lining member of the other end side.

  As described above, according to the present invention, since the types of trapezoidal lining members constituting the lining structure of the trapezoidal waterway can be reduced, the types of molds required for manufacturing the trapezoidal lining member can be reduced, and the entire lining structure The manufacturing cost can be reduced.

Schematic plan view of a water channel laying the lining structure of the embodiment The perspective view of an example of the trapezoid lining member which comprises the lining structure of FIG. Explanatory drawing of arrangement | positioning of the lining member in the lining structure of FIG. Enlarged view of the main part of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The lining structure of this embodiment is laid in the water channel 1 shown in FIG. This water channel 1 is a sand discharge channel for discharging sediment accumulated on the upstream side of a dam 2 of a water intake dam provided in a river or a valley to the downstream side from the sand discharge gate 3. To the downstream side. The sand discharge gate 3 and the water channel 1 are provided at positions shifted from the center of the dam 2 (A in FIG. 1 indicates a virtual line extending in the water flow direction through the center of the dam 2). As shown by the arrows in FIG. 1, a large amount of water containing earth and sand discharged flows from the center side of the dam 2 to the outside (one end side).

  The water channel 1 is a straight portion 1a, 1b in which the upstream portion and the downstream end portion of the dam 2 are each formed with a constant width dimension, and between the two straight portions 1a, 1b, An isosceles trapezoidal trapezoidal portion 1c having a width dimension that increases toward the downstream side is formed. Then, the conventional lining structure is laid on the straight portions 1a and 1b, and the lining structure of the embodiment is laid on the trapezoidal portion 1c. Each lining structure protects the water channel 1 by covering the floor surface of the water channel 1 with a plate-shaped metal lining member.

  FIG. 2 shows an example of the trapezoidal lining member 4 used in the lining structure of the embodiment. The trapezoidal lining member 4 has four leg portions 4b on the back surface of a plate-like main body portion 4a having a trapezoidal plan shape, and the leg portion 4b is placed on the floor surface of the water channel 1 (see FIG. (Not shown). Although not shown, other lining members (including those used for the straight portions 1a and 1b of the water channel 1) are fixed to the back of the plate-like main body portion as well as the trapezoidal lining member 4. The planar shape of the main body and the number of legs are different depending on the portion to be arranged. Each lining member is manufactured by casting.

  FIG. 3 illustrates the arrangement of the lining members in the lining structure of the water channel 1. In FIG. 3, for the sake of explanation, each lining member is given a number that indicates the difference in type depending on the planar shape and dimensions of the main body of the lining member. An unnumbered lining member represents the same type as the lining member sandwiching it in the width direction of the water channel 1.

  The lining structure of the water channel 1 is composed of a plurality of lining members in any of the straight portions 1a and 1b and the trapezoidal portion 1c of the water channel 1, and a strip-shaped lining block extending in the width direction of the water channel 1 with a constant water flow direction dimension. A plurality are arranged continuously in the water flow direction. In addition, between the lining blocks adjacent in the water flow direction, the arrangement of the lining members in the width direction of the water channel 1 is changed so that three or more corner portions of each lining member do not gather in one place. This is because the corner portion of the lining member is most easily damaged, and when the corner portions are gathered, the lining member is further easily damaged and the life of the entire lining structure is shortened.

  The lining structure laid on the straight portion 1a on the upstream side of the water channel 1 is the lining block except for the connecting portion with the trapezoidal portion 1c, and the same type of lining member (number 1) having a square planar shape is connected in the width direction of the water channel 1 A rectangular lining member (number 4) having a width different from that of the number 1 lining member constituting the row is arranged on one side of the row arranged in a row, and the end edge of the row and the side surface of the water channel upstream straight portion 1a are arranged. I try to fill the gap. In the lining block at the connection portion with the trapezoidal portion 1c, a number 5 rectangular lining member is used instead of the number 1 lining member, and a number 6 rectangular lining member is used instead of the number 4 lining member.

Moreover, the lining structure laid in the straight part 1b of the downstream end of the water channel 1 is each lining block except a connection part with the trapezoid part 1c, and the same square lining member (number 1) as the upstream straight part 1a is connected to the water channel 1 Arranged in the width direction, rectangular lining members of number 2 or 3 are arranged on both sides of this row so as to fill between the end edge of the row and the side surface of the water channel downstream straight portion 1b. In the lining block at the connection portion with the trapezoidal portion 1c, only the rectangular lining members of number 17 are arranged in the width direction of the water channel 1. Here, each lining member (numbers 1, 2, 3, and 17) is arranged symmetrically with respect to the center line B in the width direction of the water channel 1 in any lining block, so that positioning during construction can be easily performed. ing.

And the lining structure of embodiment laid in the trapezoid part 1c of the water channel 1 is the same number 1 used by each straight part 1a, 1b in each lining block except a connection part with the water channel downstream straight part 1b. Are arranged in the width direction of the water channel 1 and trapezoidal lining members (numbers 7 to 13) are arranged on both sides of the column, and the edge of the column and the channel The gap between the side surface of the trapezoidal portion 1c is filled. In the lining block of the connecting portion with the downstream straight portion 1b, the rectangular lining members of numbers 15 and 16 are used instead of the lining member of number 1, the trapezoidal lining member of number 14 on one end side, and the number on the other end side. Eighteen trapezoidal lining members are arranged. Here, the rectangular lining members (numbers 1, 4 and 15) of the respective lining blocks are all arranged symmetrically with respect to the center line B in the width direction of the water channel 1, so that positioning during construction can be easily performed. .

  Each trapezoidal lining member (numbers 7 to 14 and 18) is parallel to the side surface of the trapezoidal trapezoidal portion 1c with which one leg faces when the trapezoidal plate-shaped main body portion faces the bottom of the trapezoidal plate in the widthwise direction. The other leg is formed so as to be orthogonal to the bottom side.

  Here, in the most upstream (first) lining block of the trapezoidal part 1c of the water channel 1, each trapezoid is formed by arranging trapezoidal lining members (numbers 7 and 9) having the same shape at both ends except that the left and right sides are switched. The gap between one leg of the lining member and the side surface of the channel trapezoidal portion 1c facing the leg is the same (actually, an installation error of about several mm occurs during installation). Similarly, in the second lining block from the upstream side, the trapezoidal lining members (numbers 8 and 10) having the same shape are arranged at both ends except that the left and right sides are switched.

  On the other hand, in the third lining block from the upstream side, trapezoidal lining members (numbers 8 and 11) having different widthwise dimensions are arranged at both ends. That is, a trapezoidal lining member (number 8) of the same type used in the second lining block is arranged on the other end side of the lining block, and the width direction dimension is larger than that of the number 8 on one end side. A trapezoidal lining member (number 11) is arranged. The trapezoid lining member of No. 11 is formed in the width direction dimension which makes the gap with the side surface of the water channel trapezoidal part 1c the same as the first and second lining blocks.

  Similar to the third lining block, the trapezoidal lining members of the same kind as those used in the first or second lining block at the other end (numbers 7 and 8) in the fourth and fifth lining blocks. A trapezoidal lining member (numbers 12 and 13) having a width dimension larger than that of the other end side is arranged on one end side. The trapezoidal lining members of Nos. 12 and 13 are formed in the width direction dimension so that the gap with the side surface of the water channel trapezoidal portion 1c is the same as that of the first and second lining blocks.

  As described above, in the third to fifth lining blocks, the widthwise dimension of the trapezoidal lining member on the other end side is smaller than that on the one end side, so that the water channel trapezoidal portion 1c on the other end side as shown in FIG. The gap with the side surface is slightly wider (actually about 7 mm) than the first and second lining blocks.

  In the most downstream (sixth) lining block, the dimensions of the water flow direction are different from those of other lining blocks, and the same type of lining member used in other lining blocks cannot be used. The lining members (numbers 14 to 16 and 18) are arranged so that the gap with the side surface of the channel trapezoidal portion 1c is the same as that of the first and second lining blocks.

  The lining structure of this embodiment has the above-described configuration, and the gap between the trapezoidal lining member on the other end side and the side surface of the waterway trapezoidal portion 1c is the third to fifth lining blocks from the upstream side of the trapezoidal portion 1c of the waterway 1. Since the trapezoidal lining member of the same type as that used in the first or second lining block is arranged on the other end side to allow it to be somewhat wider than the one end side, the water channel on the other end side Compared with the case where a trapezoidal lining member having the same gap with the side surface of the trapezoidal portion 1c as the one end side is provided, the number of trapezoidal lining members to be used can be reduced, and the manufacturing cost can be reduced accordingly.

  Then, more water containing earth and sand flows on one end side in the width direction of the water channel 1 than on the other end side, but the gap between the trapezoidal lining member of each lining block and the side surface of the waterway trapezoidal portion 1c is about the same as the conventional one. It is possible to prevent the trapezoidal lining member from being unexpectedly damaged and shortening its life, while the other end side has a gap between the trapezoidal lining member of the third to fifth lining blocks and the side surface of the waterway trapezoidal portion 1c. Although it is larger than the side, since the impact caused by the collision of the earth and sand contained in the flowing water is small, there is little risk of unexpected damage to the trapezoidal lining member or shortening its life.

  In the above-described embodiment, the example in which the present invention is applied to the lining structure of an isosceles trapezoidal channel that becomes wider toward the downstream side has been described. However, the shape of the channel may be trapezoidal shape that becomes narrower toward the downstream side. Further, the trapezoidal shape does not necessarily have to be an equilateral leg. In addition, each lining member constituting the lining structure does not have a leg portion as in the embodiment, and has different shapes on the front and back due to mounting and manufacturing circumstances, and the front and back are subjected to strength (sediment collision). The surface side may be determined by the strength higher than the back side.

  Furthermore, the present invention is not limited to the trapezoidal water channel provided on the downstream side of the sand discharge gate of the dam dam as in the embodiment, but of course other than the trapezoidal water channel provided on the upstream side of the sand discharge gate. Can be widely applied to a lining structure of a trapezoidal water channel in which water flows while being biased toward one end side in the width direction.

DESCRIPTION OF SYMBOLS 1 Waterway 1a, 1b Straight part 1c Trapezoid part 2 Weir 3 Sand discharge gate 4 Trapezoid lining member 4a Main part 4b Leg part

Claims (2)

A plurality of rectangular lining members having a rectangular planar shape and arranged in the water channel width direction in a trapezoidal water channel in which the width dimension changes in the water flow direction and the water flows biased toward one end side in the width direction, and the rectangular lining member It consists of two trapezoidal lining members having a trapezoidal planar shape that fills the gap between both ends of the row and the side surface of the waterway. A strip-like lining block extending in the waterway width direction with a constant waterflow direction dimension is provided on the floor surface of the waterway. In the lining structure of the water channel arranged in a row in the water flow direction so as to cover,
In at least one of the lining blocks, the gap between the trapezoidal lining member on one end side in the waterway width direction and the side surface of the waterway is smaller than the gap between the trapezoidal lining member on the other end side and the side surface of the waterway, The same type of trapezoidal lining is used between each lining block by setting the width direction dimensions of the trapezoidal lining members on both sides and allowing the gap between the trapezoidal lining member on the other end side and the side of the water channel to be wider than one end side. A waterway lining structure characterized by using a plurality of members . The water channel is formed in an isosceles trapezoidal shape, the plurality of rectangular lining members of the lining blocks are arranged symmetrically with respect to the center of the water channel width direction, and at least one of the lining blocks, The lining structure for a water channel according to claim 1, wherein a trapezoidal lining member on one end side in the width direction of the waterway is disposed having a larger dimension in the width direction than the trapezoidal lining member on the other end side.

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