JP5960671B2 - Sediment catching member for sabo dam and sabo dam using the same - Google Patents

Description

  The present invention relates to an earth-and-sand catching member in a sabo dam installed in a mountain stream or a stream in a mountainous area, and a sabo dam using the same.

  In general, many sabo dams are installed as a means to protect private houses, facilities, roads, etc. from damage from debris flows caused by heavy rain caused by rainy seasons and typhoons.

  Such sabo dams are roughly classified into an impermeable sabo dam and a permeable sabo dam. Of these, the permeable sabo dam has a function to prevent unnecessary damming by allowing pebbles and mud flowing in the normal state to pass downstream, and to secure an empty capacity for catching earth and sand. It has the advantage of catching the boulders and driftwood that flow down prior to, etc., and stopping the damage on the downstream side.

  As such a transmission-type sabo dam, in Patent Document 1, a slit-like water channel extending in the vertical direction is formed between a pair of left and right concrete dam body portions, and an earth and sand capturing member is attached to the inside of the water channel. Sabo dams are disclosed. The earth and sand catching member includes a plurality of beam members extending in the horizontal direction. As the beam member, a steel pipe having a circular cross section, that is, a circular steel pipe is used. Both left and right end portions of these beam members are inserted from above into grooves extending in the vertical direction formed on the inner side surfaces of both dam body portions facing the water channel, and are connected to each other at the connecting portion.

  Furthermore, the part opened to the water channel side in the groove is closed with a filler so that earth and sand do not enter the inside of the groove.

  However, the shape of the filler becomes complicated around the connecting portion, and it takes time to create a processed drawing, and a manufacturing error tends to occur. In addition, the production cost is high and the production period is long.

  Therefore, as described in Patent Document 2, it has been proposed to use a filler that has a connecting portion out of the groove to simplify the shape of the space in the groove and to simplify the shape. This filler has a substantially rectangular parallelepiped block shape corresponding to the cross-sectional shape of the groove in order to fill the space inside the groove. That is, the filler has a surface that abuts on the inner end surface of the groove and a surface that abuts on a pair of opposed inner wall surfaces inside the groove. Moreover, it has a semicircular recessed part fitted in the edge part of the beam member which consists of a circular steel pipe in the upper surface side and / or lower surface side of a filler.

JP 2007-56488 A JP 2010-168891 A

  However, the filler having the shape described in Patent Document 2 has a simpler shape and fewer types than the filler described in Patent Document 1, but still has a semicircular concave portion of the filler. The shape is complicated. Therefore, there is a problem that it is difficult to design and manufacture the filler and to reduce the manufacturing cost.

  Furthermore, in the case of the substantially rectangular parallelepiped block-shaped filler as described above, when the grooves formed on the inner side surfaces of both dam body portions facing the water channel are not formed with the dimensions as designed, the shape of the filler 3D and complicated shaping is required at the construction site so as to correspond to the internal shape of the groove.

  The present invention has been made in view of the circumstances as described above, and is a sabo dam that has a simple filler shape, is easy to design and manufacture, and does not require complicated shaping of the filler at the construction site. It is an object to provide a member for use and a sabo dam using the same.

  The earth and sand catching member according to the present invention is a sabo dam in which a water channel extending in the vertical direction is formed between the left and right dam body portions, and grooves extending in the vertical direction are formed on the inner side surfaces of the both dam body portions facing the water channels. The earth-and-sand catching member that catches earth and sand in the water channel, extends in the horizontal direction, has both ends inserted into the groove, and is arranged side by side in the vertical direction. A plurality of beam members, and a filler filled in the groove in a state where both ends of each beam member are inserted into the groove, the both ends of the beam member are When viewed from the axial direction of the beam member, it has a rectangular outer shape having an upper surface and a lower surface, an upstream side surface facing the upstream side of the water channel, and a downstream side surface facing the downstream side of the water channel, It is composed of at least one flat plate-shaped member, and the filler is It characterized in that it is arranged at least in a position where it comes into contact with the upstream side of the both end portions of the beam member.

  According to this configuration, since both end portions of the beam member have a rectangular outer shape, the gap between the both end portions and the groove extending in the vertical direction formed on the inner surface of both dam body portions facing the water channel. The filler that fills the gaps that can be made can be formed of a simple flat plate-like member. Therefore, the design and manufacture of the filler can be facilitated, and the manufacturing cost can be reduced.

  Further, in this configuration, the upper and lower surfaces of both ends of the beam member are in contact with the lower surfaces and upper surfaces of other beam members, or in some cases, the intermediate members such as spacers are in contact with each other. It is possible to eliminate the gap between the top and bottom of the. Further, in a state where both ends of the beam member are respectively inserted into the grooves, the upstream side surface and the downstream side surface of the both ends of the beam member are arranged to extend in parallel with a pair of opposing inner wall surfaces inside the groove. Therefore, the gap formed between the two planes, that is, the upstream side surface of both ends of the beam member and the inner wall surface of the groove, can be reliably closed by the filler made of a flat plate-shaped member. And the downstream side surface of the both ends of a beam member can be made to contact | abut to the inner wall face of a groove | channel, and a clearance gap can be eliminated.

  Therefore, if the grooves formed on the inner side surfaces of both dam main bodies facing the water channel are not formed as designed, the width of the gap between the upstream side surface of both ends of the beam member and the inner wall surface of the groove is set. Since the filling material may be shaped so as to reduce the thickness of the flat plate-like filling material, the shaping work of the filling material becomes easy.

  Further, when the beam member receives pressure from the water flow flowing through the water channel, the both end portions come into contact with the inner wall surface of the groove located on the downstream side of the both end portions, and the beam member is separated from the inner wall surface. It is preferable to have a reinforcing member that receives the reaction force when receiving the reaction force.

  When the beam member receives pressure from the water flow flowing through the water channel, both ends of the beam member may contact the inner wall surface of the groove located on the downstream side of the both ends, and may receive a reaction force from the inner wall surface. is there. Therefore, according to the above configuration, this reaction force can be received by the reinforcing member, and deformation and breakage of both ends of the beam member can be prevented. Therefore, it is not necessary to dispose a cushion material for stress distribution on the downstream side of both ends of the beam member in order to prevent deformation at both ends. Further, since a gap for arranging the cushioning material between the both end portions of the beam member and the inner wall surface of the groove is unnecessary, it is not necessary to arrange a filler in the gap.

  Furthermore, it is preferable to further include a steel mold embedded in the groove along the inner wall surface of the groove.

  According to such a configuration, since the steel formwork is embedded in the groove along the inner wall surface of the groove, when the concrete is placed and the dam body portion having the groove is formed, the weight of the concrete is increased. By receiving with the rigidity of the mold, the risk that the mold will swell inside the groove is reduced. As a result, the groove can be formed with high accuracy. Moreover, when a beam member receives a pressure from the water flow which flows through a water channel, the both ends of a beam member contact the steel formwork which covers the inner wall face of the said groove | channel located in the downstream rather than the said both ends. This steel mold form distributes the load acting on the inner wall surface of the groove from both ends of the beam member, so that the inner wall surface of the groove can be prevented from being damaged or damaged. Therefore, it is not necessary to dispose a cushion material for stress dispersion on the downstream side of both ends of the beam member in order to prevent damage to the inner wall surface of the groove. Further, since a gap for arranging the cushioning material between the both end portions of the beam member and the inner wall surface of the groove is unnecessary, it is not necessary to arrange a filler in the gap.

  Further, the filler preferably has a beam member side contact surface that is in close contact with the upstream side surface, and a groove side contact surface that can be in close contact with the inner wall surface of the groove facing the upstream side surface. .

  According to this configuration, the beam member-side contact surface of the filler can be in close contact with the upstream side surface of the beam member, and the groove-side contact surface can be in close contact with the inner wall surface on the upstream side of the groove facing the upstream side surface. It is. In that state, the filler can reliably block the gap between the upstream side surface and the upstream inner wall surface of the groove.

  Further, the beam member is attached to a beam member main body made of a circular steel pipe, and peripheral surfaces of both end portions of the beam member main body, whereby the upper surface, the lower surface, the upstream side surface and It is preferable to include an outer shape constituting member constituting a rectangular outer shape having the downstream side surface.

  According to such a configuration, the outer configuration members attached to the peripheral surfaces of both ends of the beam member main body constitute a rectangular outer shape having an upper surface, a lower surface, an upstream side surface, and a downstream side surface at both ends of the beam member. The circular steel pipe used for the beam member of the conventional earth-and-sand catching member can be used as the beam member main body while exhibiting the above-described effects.

  Further, the outer shape component member has a plurality of components attached to the upstream side and the downstream side of the water channel on the upper side and the lower side of the both ends of the beam member main body, respectively, The first surface and the second surface are orthogonal to each other, and the upper surface, the lower surface, the upstream side surface, and the downstream side surface are configured by the first surface and the second surface of the component. preferable.

  According to such a configuration, the outer shape component member has a plurality of component parts separately attached to the upstream and downstream sides of the water channel at four locations on both ends of the beam member body, that is, on the upper side and the lower side, respectively. As a result, each component can be reduced in size. Moreover, each component can have a simple configuration having a first surface and a second surface orthogonal to each other. Therefore, manufacture of each component and attachment work to a beam member main body become easy. Moreover, in the state where the component parts are attached to the upstream side and the downstream side, respectively, on the upper side and the lower side of both ends of the beam member body as described above, the first and second surfaces of these component parts allow the beam member to It is possible to configure the upper surface, the lower surface, the upstream side surface, and the downstream side surface of both ends.

  Further, the component is disposed in a space portion formed within the range surrounded by the upper surface, the lower surface, the upstream side surface, and the downstream side surface, and outside the beam member main body. It is preferable to have a closing portion that prevents foreign matter from entering the groove through the portion.

  According to such a configuration, within the range surrounded by the upper surface, the lower surface, the upstream side surface, and the downstream side surface of the both ends of the beam member by the closed portion of each component of the outer shape component member, and outside the beam member main body It is possible to prevent foreign matter from entering the inside of the groove through the space formed in the groove.

  Furthermore, it is preferable that the filler is further disposed in a gap between both end portions of the beam member and the back end face of the groove.

  According to such a configuration, since the filler is disposed in the gap between the both end portions of the beam member and the deep end surface of the groove, it is possible to prevent foreign matters such as earth and sand from entering the gap from the uppermost portion of the groove. Is possible. In addition, since the filler supports both ends of the beam member from the axial direction, it is possible to suppress the displacement of the beam member in the axial direction.

  The beam member may further include a plurality of spacers interposed between both ends of the beam member in a state where the beam members are arranged vertically, and the spacer has an upper surface when viewed from the axial direction of the beam member. A position having a rectangular outer shape having a lower surface, an upstream side surface facing the upstream side of the water channel, and a downstream side surface facing the downstream side of the water channel, and the filler is in contact with at least the upstream side surface of the spacer Is preferably arranged.

  According to such a configuration, since the spacer is interposed between both end portions of the beam member, it is possible to arbitrarily set the vertical distance of the beam member by selecting the height of the spacer.

  In addition, since the spacer has a rectangular outer shape, the gap formed between the spacer and the groove can be reliably closed with a filler made of a flat plate-like member.

  Furthermore, it is preferable that the spacer is placed on the upper surface of both end portions of the beam member.

  According to this configuration, the spacer is easy to install because it has a structure in which the spacer is merely placed on the upper surfaces of both ends of the beam member. Further, a member for connecting the spacer to both ends of the beam member is not necessary.

  Moreover, it is preferable to further include a regulating member that regulates a horizontal displacement of the spacer with respect to both ends of the beam member.

  According to such a configuration, it is possible to regulate the horizontal displacement of the spacer with respect to both ends of the beam member by the regulating member.

  Furthermore, the sabo dam of the present invention comprises a dam body having a dam body portion disposed on both the left and right sides of a water channel extending in the vertical direction, and the above-mentioned sabo dam embankment member. Grooves extending in the vertical direction are formed on the inner side surfaces of the two dam body portions facing each other, and the both ends of each beam member of the sabo dam embankment member are inserted into the grooves, respectively. The member is disposed inside the water channel, and the filler is disposed at least in a gap between the upstream side surface of both ends of the beam member and the inner wall surface of the groove, and the downstream of both ends of the beam member. The side surface is in contact with the inner wall surface of the groove.

  According to such a configuration, since both ends of the beam member of the earth and sand capturing member have a rectangular outer shape, the both ends extend in the vertical direction formed on the inner surfaces of both dam body portions facing the water channel. The gap formed between the grooves can be reliably closed with a filler made of a simple flat plate member. That is, both end portions of the beam member are respectively inserted into the grooves, and the upstream side surface and the downstream side surface of the both end portions of the beam member are arranged so as to extend in parallel with a pair of opposing inner wall surfaces inside the groove. Yes. A gap formed between two planes, that is, the upstream side surface of both ends of the beam member and the inner wall surface of the groove can be reliably closed with a filler made of a plate-shaped member. And since the downstream side surface of the both ends of a beam member is contact | abutting to the inner wall face of a groove | channel, it is possible to eliminate a clearance gap.

  In addition, if the grooves formed on the inner side surfaces of both dam main bodies facing the water channel are not formed as designed, the width of the gap between the upstream side surface of both ends of the beam member and the inner wall surface of the groove is set. Since the filling material may be shaped so as to reduce the thickness of the flat plate-like filling material, the shaping work of the filling material becomes easy.

  Further, the groove extends in the vertical direction, and has an upstream inner wall surface and a downstream inner wall surface facing each other, and the filler includes a beam member side contact surface that is in close contact with the upstream side surface, A groove-side contact surface that is in close contact with an inner wall surface of the groove that faces the upstream side surface, and the filler has the groove-side contact surface while the beam member-side contact surface is in close contact with the upstream side surface. It is preferable to close the gap between the upstream side surface and the upstream inner wall surface of the groove in a state of being in close contact with the upstream inner wall surface of the groove facing the upstream side surface.

  According to such a configuration, the beam member side contact surface of the filler is in close contact with the upstream side surface of the beam member and the groove side contact surface is in close contact with the inner wall surface on the upstream side of the groove facing the upstream side surface. In the state, the filler can reliably block the gap between the upstream side surface and the upstream inner wall surface of the groove.

  Moreover, it is preferable that a lid for closing the uppermost portion of the groove is further provided, and the lid is fixed to the upper surface of the dam body portion.

  According to such a configuration, since the uppermost portion of the groove is closed by the lid, it is possible to prevent foreign matters such as earth and sand from entering the groove from the uppermost portion of the groove.

  In addition, since the lid is fixed to the top surface of the dam body, even when an upward load is applied to the beam member due to external force such as water flow, the lid can suppress the upward displacement of the beam member. It is.

  As described above, according to the earth-and-sand catching member for a sabo dam and the sabo dam using the same according to the present invention, the shape of the filler can be simplified and the manufacture is easy. In addition, it is easy to install the filler during construction.

It is a front view of the state which removed the part of the dam main-body part of the front side of a groove | channel in the sabo dam provided with the earth and sand capture member which concerns on embodiment of this invention. It is a top view of the state which removed the part of the dam main-body part above the groove | channel in the sabo dam of FIG. It is the III-III sectional view taken on the line of FIG. It is a perspective view of the beam member and spacer of the earth-and-sand catching member of FIG. (A) is a perspective view of the component of an external component, (b) is the front view. It is an enlarged view of the edge part vicinity of the beam member of FIG. It is the VII-VII sectional view taken on the line of FIG. FIG. 3 is an enlarged view of the vicinity of an end portion of the beam member in FIG. 2. It is explanatory drawing which shows the state by which the steel formwork is embedded in the groove | channel of FIG. It is a partially exploded perspective view of a sabo dam provided with a soil and sand catching member in which only a beam member is arranged in the vertical direction with the spacer being a modification of the present invention omitted. It is a perspective view of the spacer which is a modification of the present invention.

  Hereinafter, embodiments of the earth and sand catching member for a sabo dam (hereinafter referred to as earth and sand catching member) and a sabo dam using the same will be described in detail with reference to the drawings.

  The sabo dam 1 shown in FIGS. 1 to 3 is a so-called transmission-type sabo dam, and pebbles and mud that normally flow are transmitted to the downstream side through the water channel 7 to avoid unnecessary damming, while when debris flow occurs, It is a dam that catches boulders and driftwood that flow down prior to the pebbles and the like to stop damage on the downstream side.

  Specifically, the sabo dam 1 includes a dam body 2 having a water channel 7, a soil and sand capturing member 3 attached to the inside of the water channel 7, and a lid 14.

  The dam body 2 includes dam body parts 4 and 5 disposed on both right and left sides of a water channel 7 extending in the vertical direction, and a connecting part 6 that connects lower portions of both dam body parts 4 and 5. A water channel 7 extending in the vertical direction is formed by the dam body portions 4 and 5 and the connecting portion 6. The water channel 7 has a bottomed slit shape extending in the vertical direction and having a predetermined lateral width (for example, 5 m). Here, in FIGS. 2 and 7, the upstream side of the water channel 7 is represented by the direction of the arrow A, and the downstream side of the water channel 7 is represented by the direction of the arrow B.

  Grooves 8 extending in the vertical direction are respectively formed on the inner side surfaces of the two dam body portions 4 and 5 facing the water channel 7.

  As shown in FIGS. 8 to 9, the groove 8 has a U shape in a plan view opened to the water channel 7 side. That is, the groove 8 has a side opening 8 a that opens laterally so as to communicate with the water channel 7 and an inner wall surface 8 b on the far end side. The groove 8 extends in the vertical direction and has an upstream inner wall surface 8c and a downstream inner wall surface 8d facing each other.

  Moreover, as shown in FIGS. 8 to 9, the steel mold 15, which will be described later, which is a constituent element of the earth and sand catching member 3, is provided in the groove 8 along the inner wall surfaces 8 b, 8 c, and 8 d inside the groove 8. Embedded.

  The lid 14 is disposed at a position covering the uppermost portion of the groove 8 and closes the uppermost portion of the groove 8. The lid 14 is fixed to the upper surface of the dam body portions 4 and 5 with bolts or the like.

  In addition, in the dam body 2 shown in FIGS. 1 to 3, the reinforced concrete portions 9 are formed on both sides of the water channel 7 on the upstream side A and the downstream side B of the dam body portions 4 and 5, respectively.

  As shown in FIGS. 1 to 3, the earth and sand capturing member 3 is a member that is attached to the inside of the water channel 7 of the dam body 2 and captures the earth and sand in the water channel 7.

  Specifically, the earth and sand catching member 3 includes a plurality of beam members 11 arranged side by side in the vertical direction and a plurality of spacers 12 interposed between both end portions 11a and 11b of the beam member 11 arranged in the vertical direction. A seal portion 13 having a plurality of flat fillers 13a, 13b, a pin 16 (see FIG. 4) for regulating the horizontal displacement of the spacer 12 with respect to both end portions 11a, 11b of the beam member 11, and steel A mold frame 15 (see FIGS. 8 to 9) is provided.

  The steel mold 15 is made of a steel plate or the like, and has higher bending rigidity and tensile rigidity than a wooden mold. The steel mold 15 is connected to the main body 15a formed in a so-called substantially U-shape along the inner wall surfaces 8b, 8c, 8d of the groove 8, and the edges on both sides of the main body 15a. A flange portion 15b extending in the vertical direction is provided so as to cover an edge extending in the vertical direction of the side opening 8a of the groove 8.

  Each beam member 11 extends in the horizontal direction and has such a length that both end portions 11 a and 11 b are inserted into the groove 8.

  4 to 8, each beam member 11 includes a beam member main body 21 made of a circular steel pipe, and an outer configuration member 20 constituting the outer shape of both end portions 11a and 11b of the beam member 11. .

  As the beam member main body 21, a circular steel pipe generally used as a beam member of a conventional earth and sand capturing member is used.

  The outer shape component 20 is attached to the peripheral surfaces of both end portions 21a and 21b of the beam member main body 21 so that the upper surface 23 and the lower surface 24 of the both end portions 11a and 11b of the beam member 11 face the upstream side of the water channel 7. It is a member constituting a rectangular outer shape having a side surface 25 and a downstream side surface 26 facing the downstream side of the water channel 7.

  Specifically, the outer configuration member 20 includes four component parts 22 each having an L-shaped steel plate 22a.

  That is, each component 22 has an L-shaped steel plate 22a and a closing body 22b connected to the inside of the L-shaped steel plate 22a, as shown in FIGS. The L-shaped steel plate 22a is a steel plate having an L-shaped cross section, and has a first surface 22a1 and a second surface 22a2 that are orthogonal to each other on the outside thereof.

  The closing body 22b is made of one or a plurality of substantially triangular steel plates or rods. The closing body 22b includes a first connection surface 22b1 and a second connection surface 22b2 that are connected to the inner surface of the L-shaped steel plate 22a, and arc shapes of both end portions 21a and 21b of the beam member body 21 made of a circular steel pipe. And a third connection surface 22b3 connected to the outer peripheral surface.

  The four component parts 22 are arranged at equal intervals around the opposite ends 21 a and 21 b of the beam member main body 21 at regular intervals, and the third connection surfaces 22 b 3 of the closing body 22 b are respectively arranged at both ends 21 a of the beam member main body 21. , 21b. That is, the component 22 is attached to the upstream side and the downstream side of the water channel 7 on the upper side and the lower side of both ends 21a and 21b, respectively. As a result, the first surface 22a1 and the second surface 22a2 of the L-shaped steel plate 22a included in each of the four component parts 22 form the outer shapes of the both end portions 11a and 11b of the beam member 11 as the upper surface 23, the lower surface 24, and the upstream side. A rectangular outer shape having a side surface 25 and a downstream side surface 26 is formed. In other words, the L-shaped steel plate 22a of the component 22 forms four corners of a rectangular outer shape.

  Further, the closing body 22b has an axial surface 22b4 facing the water channel 7 side (that is, the side exiting from the groove 8 to the water channel 7) in the axial direction of the beam member main body 21.

  As shown in FIG. 7, the axial surface 22 b 4 is a space formed within the range surrounded by the upper surface 23, the lower surface 24, the upstream side surface 25 and the downstream side surface 26 and outside the beam member main body 21. It arrange | positions in the part A and the said space part A is closed. Thereby, the axial direction surface 22b4 can function as a closing portion that prevents foreign matter from entering the inside of the groove 8 through the space portion A.

  6-7, when the beam member 11 receives pressure from the water flow which flows through the water channel 7, both ends 11a and 11b are on the downstream side of the both ends 11a and 11b. It has a reinforcing member 31 that receives the reaction force when it contacts the inner wall surface of the groove 8 and receives a reaction force from the inner wall surface.

  Specifically, the reinforcing member 31 has a vertical plate 32 and a horizontal plate 33 attached to the inside of the beam member main body 21 made of a circular steel pipe. The vertical plate 32 and the horizontal plate 33 are made of a member having high compressive strength such as a steel plate. Both ends of the vertical plate 32 and the horizontal plate 33 are fixed to the inner peripheral surface of the beam member main body 21, respectively.

  Since the both end portions 11a and 11b of the beam member 11 are configured as described above, the both end portions 11a and 11b are upper surfaces when viewed from the axial direction of the beam member 11, as shown in FIGS. 23, a rectangular outer shape having a lower surface 24, an upstream side surface 25 facing the upstream side of the water channel 7, and a downstream side surface 26 facing the downstream side of the water channel 7.

  As shown in FIGS. 1 to 3, the both ends 11 a and 11 b of each beam member 11 are inserted in the grooves 8 on both sides of the water channel 7, and the earth and sand catching member 3 is vertically moved inside the water channel 7. They are arranged side by side. Further, spacers 12 are interposed between both end portions 11a and 11b of the beam members 11 arranged in the vertical direction. Here, the interval between the beam members 11 can be changed by appropriately changing the height dimension of the spacer 12.

  Further, in a state where both end portions 11 a and 11 b of the beam member 11 are inserted into the groove 8, the downstream side surface 26 of the both end portions 11 a and 11 b of the beam member 11 is located downstream of the groove 8 as shown in FIG. 7. Is in contact with the inner wall surface 8d.

  The plurality of spacers 12 are components that are interposed between both end portions 11a and 11b of the beam member 11 in a state where the beam members 11 are arranged vertically.

  As shown in FIG. 4, the spacer 12 has a substantially rectangular parallelepiped shape. That is, the spacer 12 has a rectangular shape having an upper surface 36, a lower surface 37, an upstream side surface 38 facing the upstream side of the water channel 7, and a downstream side surface 39 facing the downstream side of the water channel 7 when viewed from the axial direction of the beam member 11. It has the outer shape.

  Further, the spacer 12 has an axial surface 40 facing the water channel 7 side (that is, the side exiting from the groove 8 to the water channel 7) in the axial direction of the beam member main body 21. The axial surface 40 closes the space surrounded by the upper surface 36, the lower surface 37, the upstream side surface 38 and the downstream side surface 39 of the spacer 12. Thereby, the axial direction surface 40 can function as a closing part which prevents that a foreign material permeates into the inside of the groove | channel 8 through the said space part. The spacer 12 has a back side surface 41 facing the side facing the axial surface 40 (the back side of the groove 8).

  The spacer 12 is manufactured to have a substantially rectangular parallelepiped shape by combining, for example, a steel plate or H-shaped steel. For example, an H-shaped steel 42 is prepared in which a plate-like portion constituting the upper surface 36 and a plate-like portion constituting the lower surface 37 are connected by the vertical plate 35, and the space between the upper surface 36 and the lower surface 37 in the H-shaped steel 42 is a steel plate The outer spacer 12 having a substantially rectangular parallelepiped shape as shown in FIG. 4 is manufactured.

  The spacer 12 is disposed in a state of being sandwiched between both end portions 11a and 11b of the beam member 11 arranged in the vertical direction, and is placed on the upper surface 23 of the both end portions 11a and 11b of the beam member 11 in that state. Only in the state. That is, since the both ends 11a and 11b and the spacer 12 are not connected by a bolt or the like, the spacer 12 and the both ends 11a and 11b of the beam member 11 can be easily separated in the vertical direction. . A spacer 12 is also arranged between the lowermost beam member 11 and the lower end of the water channel 7.

  As shown in FIG. 4, the spacer 12 and both ends 11 a and 11 b of the beam member 11 are simply coupled by pins 16. The pin 16 is inserted into the opening formed in the upper surface 36 and the lower surface 37 of the spacer 12 and the opening formed in the first surface 22a1 extending in the horizontal direction of the component 22 of the outer component 20 on the beam member 11 side. Yes. Thereby, the pin 16 is connected to the both ends 11a and 11b of the beam member 11 so that the displacement of the spacer 12 in the horizontal direction is restricted. As described above, the spacer 12 and the both ends 11a and 11b of the beam member 11 can be easily coupled by the pin 16, and the coupling can be easily released by removing the pin 16. Since it is possible, the assembly and disassembly of the earth-and-sand catching member 3 are easy.

  As shown in FIGS. 4 and 6 to 7, the seal portion 13 includes a plurality of fillers, that is, a first filler 13 a and a second filler 13 b.

  The first filler 13a and the second filler 13b are each constituted by a flat plate-shaped member.

  That is, the first filler 13a includes a beam member side contact surface 13a1 that is in close contact with the upstream side surface 25 of both ends 11a and 11b of the beam member 11, and an upstream inner wall surface of the groove 8 that faces the upstream side surface 25. And a groove-side contact surface 13a2 that can be in close contact with 8c.

  The second filler 13b includes a beam member-side contact surface 13b1 that is in close contact with the axial end portion 11d of both ends 11a and 11b of the beam member 11, and a back side of the groove 8 that faces the axial end portion 11d. And a groove-side contact surface 13b2 that can be in close contact with the inner wall surface 8b.

  As the first and second fillers 13a and 13b, a foam material (for example, styrofoam) having high water tightness, light weight and easy handling is suitable, but the material is not particularly limited.

  The flat plate-like first filler 13a and second filler 13b described above have the grooves 8 in a state where both end portions 11a and 11b of each beam member 11 are inserted into the groove 8 as follows. The inside is filled.

  Here, since the upper surface 23 and the lower surface 24 of the both ends 11a and 11b of the beam member 11 are in contact with the lower surface 37 and the upper surface 36 of the spacer 12, there is already a gap between the upper and lower ends 11a and 11b of the beam member 11. It is blocked. Further, since the downstream side surfaces 26 of the both end portions 11a and 11b of the beam member 11 are in contact with the inner wall surface 8d on the downstream side of the groove 8, the downstream gaps of the both end portions 11a and 11b are already closed. Accordingly, the other portion, that is, the gap on the upstream side of both ends 11a and 11b of the beam member 11 (gap B1 in FIG. 7) and the gap in the axial end 11d of both ends 11a and 11b (gap C1 in FIG. 6). ) May be closed with the first filler 13a and the second filler 13b.

  Specifically, the first filler 13a and the second filler 13b are arranged as follows.

  As shown in FIG. 7, the first filler 13 a is in contact with the upstream side surface 25 of both ends 11 a and 11 b of the beam member 11, that is, the upstream side surface 25 and the inner wall surface 8 c on the upstream side of the groove 8. It is arrange | positioned in the clearance gap B1. The beam member side contact surface 13a1 and the groove side contact surface 13a2 are respectively provided on the upstream side surface 25 and the inner wall surface 8c of the groove 8 (more specifically, as shown in FIG. 8, the steel mold 15 covering the inner wall surface 8c). By closely contacting, the first filler 13a closes the gap B1. The first filler 13 a is also disposed in the gap B <b> 2 between the spacer 12 and the inner wall surface 8 c on the upstream side of the groove 8. The beam member side contact surface 13a1 and the groove side contact surface 13a2 are in close contact with the upstream side surface 38 of the spacer 12 and the inner wall surface 8c of the groove 8, so that the first filler 13a closes the gap B2.

  As shown in FIG. 6, the second filler 13 b is disposed in a gap C <b> 1 between the axial end 11 d of both ends 11 a and 11 b of the beam member 11 and the inner wall surface 8 b on the back side of the groove 8. The beam member side contact surface 13b1 and the groove side contact surface 13b2 are formed on the axial end portion 11d and the inner wall surface 8b of the groove 8 (more specifically, as shown in FIG. 8, a steel mold 15 covering the inner wall surface 8b). By closely contacting each other, the second filler 13b closes the gap C1. The second filler 13b is also disposed in the gap C2 between the spacer 12 and the inner wall surface 8b on the back side of the groove 8. The beam member side contact surface 13b1 and the groove side contact surface 13b2 are in close contact with the back side surface 41 of the spacer 12 and the inner wall surface 8b of the groove 8, so that the second filler 13b closes the gap C2.

  By arranging the flat plate-like first filler 13a and second filler 13b as described above, the ends 8a and 11b of each beam member 11 and the inner wall surfaces 8b and 8c of the groove 8 are formed inside the groove 8. It is possible to reliably close the gaps B1 and C1. At the same time, the gaps B2 and C2 between the spacer 12 and the inner wall surfaces 8b and 8c of the groove 8 can be reliably closed.

(Feature)
(1)
In the earth and sand catching member 3 of the present embodiment, both end portions 11 a and 11 b of the beam member 11 have a rectangular outer shape, and therefore both the dam body portions 4 and 5 facing the both end portions 11 a and 11 b and the water channel 7. The first filler 13a and the second filler 13b that fill the gaps B1 and C1 formed between the groove 8 and the vertically extending groove 8 formed on the inner surface of the inner surface can be configured by a simple flat plate member. Become. Therefore, the fillers 13a and 13b can be easily designed and manufactured, and the manufacturing cost can be reduced.

  Further, in the structure of the earth and sand capturing member 3 described above, the upper surface 23 and the lower surface 24 of the both end portions 11a and 11b of the beam member 11 are brought into contact with the lower surface 37 and the upper surface 36 of the spacer 12, whereby both end portions 11a of the beam member 11 are contacted. , 11b can be eliminated. Further, in a state where both end portions 11 a and 11 b of the beam member 11 are inserted into the grooves 8, the upstream side surface 25 and the downstream side surface 26 of the both end portions 11 a and 11 b of the beam member 11 are opposed to each other inside the groove 8. Are disposed so as to extend in parallel with the pair of inner wall surfaces 8c, 8d, and therefore, between the two planes of the upstream side surface 25 of both ends 11a, 11b of the beam member 11 and the inner wall surface 8c on the upstream side of the groove 8. The gap B1 that can be formed can be reliably closed by the first filler 13a made of a flat plate-shaped member. Then, the downstream side surface 26 of both end portions 11 a and 11 b of the beam member 11 can be eliminated by contacting the inner wall surface 8 d of the groove 8.

  Accordingly, when the grooves 8 formed on the inner side surfaces of the two dam body portions 4 and 5 facing the water channel 7 are not formed as designed, the upstream side surfaces 25 of the both end portions 11a and 11b of the beam member 11 and What is necessary is just to shape the 1st filler 13a so that the thickness of the flat 1st filler 13a may be reduced so that the width | variety B1 with the inner wall surface 8c of the groove | channel 8 may be met. Similarly, the thickness of the flat plate-like second filler 13b is adjusted so as to match the width of the gap C1 between the both end portions 11a, 11b of the beam member 11 and the inner wall surface 8b (back end surface) on the back side of the groove 8. What is necessary is just to shape the 2nd filler 13b so that it may reduce. Therefore, the shaping work of the fillers 13a and 13b is facilitated.

(2)
When the beam member 11 receives pressure from the water flow flowing through the water channel 7, both end portions 11a and 11b of the beam member 11 come into contact with the inner wall surface 8d of the groove 8 located on the downstream side of the both end portions 11a and 11b. There may be a reaction force from the inner wall surface. Therefore, the earth-and-sand catching member 3 according to the present embodiment includes the reinforcing member 31, so that the reaction force can be received by the reinforcing member 31. Thereby, it is possible to prevent deformation and breakage of both end portions 11a and 11b of the beam member 11. Therefore, it is not necessary to arrange a cushion material for stress dispersion on the downstream side of both end portions 11a and 11b of the beam member 11 in order to prevent deformation of both end portions 11a and 11b. Further, since a gap for arranging the cushion material between the both end portions 11a, 11b of the beam member 11 and the inner wall surface of the groove 8 is not necessary, it is not necessary to arrange a filler in the gap.

(3)
The earth and sand catching member 3 of this embodiment includes a steel mold 15, and the steel mold 15 is embedded in the groove 8 along the inner wall surface of the groove 8. Thereby, when placing the concrete and forming the dam body parts 4 and 5 having the grooves 8, the weight of the concrete is received by the rigidity of the mold frame, thereby reducing the possibility that the mold frame will swell inside the groove 8. Is done. As a result, the groove 8 can be formed with high accuracy. Further, when the beam member 11 receives pressure from the water flow flowing through the water channel 7, the both end portions 11a and 11b of the beam member 11 are the inner wall surface 8d of the groove 8 positioned on the downstream side B from the both end portions 11a and 11b. The steel mold 15 that covers (see FIG. 8) is contacted. The steel mold 15 disperses the load acting on the inner wall surface 8d of the groove 8 from both end portions 11a and 11b of the beam member 11, so that the inner wall surface 8d of the groove 8 can be prevented from being damaged or damaged. is there. Therefore, in order to prevent damage to the inner wall surface 8d of the groove 8, there is no need to arrange a cushion material for stress distribution on the downstream side B of the both end portions 11a and 11b of the beam member 11. Further, since a gap for arranging the cushion material between the both end portions 11a, 11b of the beam member 11 and the inner wall surface 8d of the groove 8 is not necessary, it is not necessary to arrange a filler in the gap.

(4)
In the earth and sand catching member 3 of the present embodiment, the first filler 13a has the beam member side contact surface 13a1 and the groove side contact surface 13a2, so that the beam member side contact surface 13a1 is in close contact with the upstream side surface 25 of the beam member 11. In addition, the groove-side contact surface 13a2 can be in close contact with the upstream inner wall surface 8c of the groove 8 facing the upstream side surface 25. In this state, the first filler 13a can reliably close the gap B1 between the upstream side surface 25 and the upstream inner wall surface 8c of the groove 8.

(5)
In the earth and sand catching member 3 of the present embodiment, the external component 20 attached to the peripheral surfaces of both ends 21a and 21b of the beam member main body 21 is the upper surface 23, the lower surface 24, and the upstream side at both ends 11a and 11b of the beam member 11. Since the rectangular external shape which has the side surface 25 and the downstream side surface 26 is comprised, the beam member 11 of the conventional earth-and-sand catching member 3 as the beam member main body 21 is demonstrated, exhibiting the effect of said item (1)-(4). It is possible to use a circular steel pipe used in the above.

(6)
In the earth and sand catching member 3 of the present embodiment, the outer shape constituting member 20 is separately provided on the upstream side and the downstream side of the water channel 7 at the four ends of the both ends 21a and 21b of the beam member main body 21, that is, on the upper side and the lower side, respectively. Since it has the some component 22 attached, it becomes possible to make each component 22 small. In addition, each component 22 can have a simple configuration having a first surface 22a1 and a second surface 22a2 orthogonal to each other. Therefore, manufacture of each component 22 and attachment work to the beam member main body 21 are facilitated. In addition, when the component 22 is attached to the upstream side and the downstream side of the upper and lower ends of the both ends 21a and 21b of the beam member main body 21 as described above, the first surface 22a1 and The upper surface 23, the lower surface 24, the upstream side surface 25, and the downstream side surface 26 of both ends 11a and 11b of the beam member 11 can be configured by the two surfaces 22a2.

(7)
In the earth and sand catching member 3 of the present embodiment, the upper surface 23, the lower surface 24, and the upstream side surface of both ends 11a and 11b of the beam member 11 are provided by the axial direction surface 22b4 that functions as a closing portion of each component 22 of the outer configuration member 20. 25 and foreign matter such as earth and sand can be prevented from entering the groove 8 through the space A formed outside the beam member main body 21 within the range surrounded by the downstream side surface 26. is there.

(8)
In the earth and sand catching member 3 of the present embodiment, the second filler 13b is disposed in the gap C1 between the both end portions 11a and 11b of the beam member 11 and the inner wall surface 8b on the back side of the groove 8 (that is, the back end surface). Therefore, it is possible to prevent foreign matters such as earth and sand from entering the gap C1 from the uppermost part of the groove 8. Further, since the second filler 13b supports both end portions 11a and 11b of the beam member 11 from the axial direction, the displacement of the beam member 11 in the axial direction can be suppressed.

(9)
In the earth and sand catching member 3 of this embodiment, since the spacer 12 is interposed between the both ends 11a and 11b of the beam member 11, the vertical distance of the beam member 11 can be arbitrarily set by selecting the height of the spacer 12. It is possible to set.

  Moreover, since the spacer 12 has a rectangular outer shape, the gaps B2 and C2 formed between the spacer 12 and the groove 8 are also formed by the first filler 13a and the second filler 13b made of flat plate members. It is possible to plug it reliably.

(10)
In the earth and sand catching member 3 of this embodiment, since the spacer 12 has a structure in which the spacer 12 is merely placed on the upper surfaces 23 of the both end portions 11a and 11b of the beam member 11, the spacer 12 can be easily installed. Further, a member for connecting the spacer 12 to the both end portions 11a and 11b of the beam member 11 becomes unnecessary.

(11)
In the earth and sand catching member 3 of the present embodiment, the pin 16 as a regulating member engages the spacer 12 with the both end portions 11 a and 11 b of the beam member 11, whereby the spacer 12 is horizontal with respect to the both end portions 11 a and 11 b of the beam member 11. It is possible to regulate the displacement in the direction.

  In addition, as long as the displacement of the spacer 12 in the horizontal direction can be regulated, a regulating member other than the pin 16 may be employed.

(12)
In the sabo dam 1 of the present embodiment, both end portions 11a and 11b of the beam member 11 of the earth and sand catching member 3 have a rectangular outer shape, so both dam main bodies facing both the end portions 11a and 11b and the water channel 7 are provided. The gaps B1 and C1 formed between the vertically extending grooves 8 formed on the inner surfaces of the portions 4 and 5 can be reliably closed by a plurality of fillers 13a and 13b made of a simple flat plate member. It is. That is, both end portions 11a and 11b of the beam member 11 are inserted into the groove 8 respectively, and the upstream side surface 25 and the downstream side surface 26 of the both end portions 11a and 11b of the beam member 11 are opposed to each other inside the groove 8. Are arranged so as to extend in parallel with the inner wall surfaces 8c and 8d. A gap B1 formed between the two planes of the upstream side surface 25 of both ends 11a and 11b of the beam member 11 and the inner wall surface 8c on the upstream side of the groove 8 is ensured by the first filler 13a made of a flat plate member. It can be closed. And since the downstream side surface 26 of both ends 11a and 11b of the beam member 11 is in contact with the inner wall surface 8c on the downstream side of the groove 8, it is possible to eliminate the gap.

  In addition, when the grooves 8 formed on the inner side surfaces of the two dam body portions 4 and 5 facing the water channel 7 are not formed as designed, the upstream side surfaces 25 of the both end portions 11a and 11b of the beam member 11 What is necessary is just to shape the 1st filler 13a so that the thickness of the flat 1st filler 13a may be reduced so that the width | variety B1 with the inner wall surface 8c of the groove | channel 8 may be met. Further, the thickness of the flat plate-like second filler 13b is reduced so as to match the width of the gap C1 between the both end portions 11a, 11b of the beam member 11 and the inner wall surface 8b (back end surface) on the back side of the groove 8. The first filler 13a may be shaped. Therefore, the shaping work of the fillers 13a and 13b is facilitated.

(13)
In the sabo dam 1 of the present embodiment, the beam member side contact surface 13a1 of the first filler 13a is in close contact with the upstream side surface 25 of the beam member 11, and the groove side contact surface 13a2 is the groove 8 facing the upstream side surface 25. In this state, the first filler 13a can reliably block the gap B1 between the upstream side surface 25 and the upstream inner wall surface 8c of the groove 8. It is.

(14)
In the sabo dam 1 of this embodiment, since the uppermost part of the groove 8 is closed by the lid 14, it is possible to prevent foreign matters such as earth and sand from entering the groove 8 from the uppermost part of the groove 8.

  Further, since the lid 14 is fixed to the upper surface of the dam body portions 4 and 5, even when an upward load is applied to the beam member 11 by an external force such as a water flow, the lid 14 causes the lid 14 to move upward. It is possible to suppress the displacement.

(Modification)
(A)
In the earth and sand capturing member 3 of the above embodiment, the structure in which the spacer 12 is interposed between the both end portions 11a and 11b of the beam member 11 arranged in the vertical direction has been described as an example. Without being limited thereto, as shown in FIG. 10, the spacer 12 may be omitted, and only the beam members may be arranged in the vertical direction while the ends 11 a and 11 b of the beam member 11 are in contact with each other. Also in this case, since both end portions 11a and 11b have a rectangular outer shape, both end portions 11a and 11b are inserted in the state where both end portions 11a and 11b of the beam members 11 aligned in the vertical direction are inserted into the grooves 8 extending in the vertical direction. By bringing the upper surface 23 and the lower surface 23 into contact with each other, the beam member 11 alone can be stably stacked. In addition, by omitting the spacer 12, it is possible to eliminate a gap (so-called beam member interval) between the upper and lower ends 11a and 11b of the beam member 11.

(B)
The spacer 12 of the above embodiment has a substantially rectangular parallelepiped outer shape, but the present invention is not limited to this, and as shown in FIG. 11, an H-shaped steel 42 and a plurality of reinforcing members are used. A spacer having a simpler structure may be used by combining steel plates (so-called stiffeners) 45 to 47. In this spacer 12, an H-shaped steel 42 in which a plate-like portion constituting the upper surface 36 and a plate-like portion constituting the lower surface 37 are connected by a vertical plate 35 is prepared, and a plurality of sheets are provided between the upper surface 36 and the lower surface 37. The reinforcing steel plates 45 to 47 are arranged in parallel with each other from the entrance side D to the back end side E of the groove 8. These reinforcing steel plates 45 to 47 can prevent foreign matters such as earth and sand from entering the groove 8 through the space inside the spacer 12.

(C)
In the sabo dam 1 of the above embodiment, a structure in which the steel mold 15 is embedded in the groove 8 is shown, but the present invention is not limited to this, and the steel mold 15 is omitted. May be.

(D)
In the above embodiment, the two fillers, that is, the first filler 13a that is in close contact with the upstream side surface 25 of both ends 11a and 11b of the beam member 11, and the axial ends of both ends 11a and 11b of the beam member 11 are used. Although the example provided with the 2nd filler 13b closely_contact | adhered to 11d is shown, this invention is not limited to this, At least 1st filler 13a of the both ends 11a and 11b of a beam member is shown. What is necessary is just to be arrange | positioned in the position contact | abutted to the upstream side surface 25. FIG. Correspondingly, the beam member 11 may be configured to include a beam member main body 21 made of a circular steel pipe and an outer configuration member 20 having only the upstream side surface 25 that abuts on the filler.

DESCRIPTION OF SYMBOLS 1 Sabo dam 2 Dam body 3 Sediment supplement member 4, 5 Dam body part 7 Water channel 8 Groove 11 Beam member 11a, 11b End part 12 Spacer 13a 1st filler 13b 2nd filler 14 Lid 15 Steel formwork 16 Pin ( Regulatory member)
20 External component 21 Beam member main body 22 Component 22a1 First surface 22a2 Second surface 23 Upper surface 24 Lower surface 25 Upstream side surface 26 Downstream side surface 31 Reinforcing member

Claims (14)

A water channel extending in the vertical direction is formed between the left and right dam body parts, and is used in a sabo dam in which grooves extending in the vertical direction are formed on the inner side surfaces of the both dam body parts facing the water channel. An earth and sand catching member for catching earth and sand,
A plurality of beam members extending in the horizontal direction, having both ends inserted into the groove, and arranged side by side in the vertical direction;
A filling material filled in the groove in a state where both ends of each beam member are inserted into the groove,
Both ends of the beam member have a rectangular outer shape having an upper surface and a lower surface, an upstream side surface facing the upstream side of the water channel, and a downstream side surface facing the downstream side of the water channel when viewed from the axial direction of the beam member. Have
The filler is constituted by at least one flat plate-shaped member,
The filler is disposed at a position that contacts at least the upstream side surface of both ends of the beam member.
An earth and sand catching member for a sabo dam. When the beam member receives pressure from the water flow flowing through the water channel, the both end portions come into contact with the inner wall surface of the groove located on the downstream side of the both end portions, and the reaction force is generated from the inner wall surface. Having a reinforcing member that receives the reaction force when receiving
The earth-and-sand catching member for sabo dams according to claim 1. A steel mold embedded in the groove along the inner wall surface of the groove;
The earth-and-sand catching member for sabo dams according to claim 1 or 2. The filler has a beam member side contact surface that is in close contact with the upstream side surface, and a groove side contact surface that can be in close contact with the inner wall surface of the groove facing the upstream side surface.
The earth-and-sand catching member for sabo dams according to any one of claims 1 to 3. The beam member is
A beam member body made of a circular steel pipe;
An outer component constituting the rectangular outer shape having the upper surface, the lower surface, the upstream side surface, and the downstream side surface at both ends of the beam member by being attached to the peripheral surfaces of both ends of the beam member main body. And
The earth-and-sand catching member for sabo dams according to any one of claims 1 to 4. The outer configuration member has a plurality of components attached to the upstream side and the downstream side of the water channel on the upper side and the lower side of both ends of the beam member main body, respectively.
Each component has a first surface and a second surface orthogonal to each other,
The upper surface, the lower surface, the upstream side surface and the downstream side surface are constituted by the first surface and the second surface of the component parts.
The earth-and-sand catching member for sabo dams according to claim 5. The component is disposed within a space surrounded by the upper surface, the lower surface, the upstream side surface, and the downstream side surface, and in a space formed outside the beam member body, and the space portion is Having a closure to prevent foreign objects from penetrating into the groove,
The earth-and-sand catching member for sabo dams according to claim 6. The filler is further disposed in a gap between both end portions of the beam member and the back end surface of the groove.
The earth-and-sand catching member for sabo dams according to any one of claims 1 to 7. A plurality of spacers interposed between both ends of the beam member in a state where the beam members are arranged vertically;
The spacer has a rectangular outer shape having upper and lower surfaces, an upstream side surface facing the upstream side of the water channel, and a downstream side surface facing the downstream side of the water channel when viewed from the axial direction of the beam member,
The filler is disposed at a position that contacts at least the upstream side surface of the spacer.
The earth-and-sand catching member for sabo dams of any one of Claims 1-8. The spacer is placed on the upper surface of both end portions of the beam member,
The earth-and-sand catching member for sabo dams according to claim 9. The sediment catching member for a sabo dam according to claim 10, further comprising a regulating member that regulates a horizontal displacement of the spacer with respect to both ends of the beam member. A dam body having a dam body portion disposed on both right and left sides of a water channel extending in the vertical direction;
It comprises the earth and sand catching member for sabo dams according to any one of claims 1 to 11,
On the inner side surfaces of the two dam body portions facing the water channel, grooves extending in the vertical direction are respectively formed.
In a state where both ends of each beam member of the sabo dam embankment member is inserted into the groove, the earth capture member is disposed inside the water channel,
The filler is disposed in a gap between at least the upstream side surface of both ends of the beam member and the inner wall surface of the groove,
The downstream side surfaces of both ends of the beam member are in contact with the inner wall surface of the groove.
Sabo dam characterized by that. The groove extends in the vertical direction and has an upstream inner wall surface and a downstream inner wall surface facing each other.
The filler has a beam member side contact surface that is in close contact with the upstream side surface, and a groove side contact surface that is in close contact with the inner wall surface of the groove facing the upstream side surface,
In the state where the beam member side contact surface is in close contact with the upstream side surface and the groove side contact surface is in close contact with the upstream inner wall surface of the groove facing the upstream side surface, the filler is in the upstream side. Block the gap between the side surface and the inner wall surface upstream of the groove,
The sabo dam according to claim 12. A lid that closes the top of the groove;
The lid is fixed to the upper surface of the dam body portion,
The sabo dam according to claim 12 or 13.

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