JP2009167656A - Bed protection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bed protection structure which is excellent in adaptability to bed fluctuation when an earthquake or the like occurs, in workability when constructed on a bed, and in durability when colliding against various types of gravel. <P>SOLUTION: A multiple sheet pile wall forming member 10 is set up by connecting between webs 15 of a first steel sheet pile 11a and a second steel sheet pile 11b, which are opposite each other, each having joints 16 on both lateral edges, via spacer members 12. Then sheet pile walls 20 which are each set up by alternately arranging the first steel sheet piles 11a and the second steel sheet piles 11b along a river width direction, are formed in a plurality of rows on the bed 5 along a river flowing direction by connecting the joint 16 of each first steel sheet pile 11a and the joint 16 of each second steel sheet pile 11b of the multiple sheet pile wall forming members 10 adjacent to each other in the river width direction. Further an infill B is bedded between the sheet pile walls 20 adjacent to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a riverbed protection structure suitable for preventing scouring or the like of a riverbed in a front yard located downstream of a sabo dam.

  Conventionally, various types of sabo dams have been constructed in rivers, which makes it possible to adjust the amount of sediment flowing down the river and capture boulders and driftwood that flow down the river when debris flows. The gravel body is prevented from abruptly flowing to the downstream side of the river.

  FIG. 22 is a schematic side sectional view of an impervious sabo dam 100 represented by a concrete gravity sabo dam. The sabo dam 100 is located between the dam body 114 provided on the river bed 101 so as to cross the river width direction, the sleeve portions 110 provided on both sides of the upper end portion of the dam body 114 in the river width direction, and the sleeve portions 110. And the upper end part of the sleeve part 110 is comprised lower than the upper end part, and it is comprised from the overflow part 111 which can overflow a river and various gravel bodies.

  When such a sabo dam 100 is erected, the river bed 101 of the vestibular part 112 located downstream of the sabo dam 100 is directed in the direction of arrow S shown in FIG. As overflow water and various gravel bodies fall toward the riverbed, the riverbed 101 in the front yard 112 is scoured and eroded. In order to protect the riverbed 101 from being damaged by such scouring and erosion, a riverbed protection structure called a paddle 113 is usually provided on the riverbed 101 of the front yard 112. This paddle 113 is constructed by placing concrete on the river bed 101 of the vestibule 112, and this paddle 113 collides with overflow water or the like to reduce its fall energy, thereby It is possible to prevent the riverbed 101 of the front yard 112 from being directly scoured or indirectly scoured by the jumping phenomenon of overflowing falling overflow water. Incidentally, the sabo dam 100 is usually provided with a water dam 113 and a sub dam 120 as shown in FIG. 22, and overflow water and various gravel bodies flowing down through the overflow section 111 are the dam body of the sub dam 120. By colliding with the sleeve 121 and the sleeve 122, the flow-down speed of these overflowing water and the like is reduced.

  As another riverbed protection structure provided in the vestibule portion 112, a plurality of high-strength blocks are arranged in the vestibule portion 112, and concrete is placed between the high-strength blocks adjacent to each other, and each high-strength block is provided. Have been proposed (see, for example, Patent Document 1). In this riverbed protection structure, the high-strength block has both strength and wear resistance. The durability against is improved.

  As another riverbed protection structure, a mat formed by interposing a core member having a honeycomb or polygonal cross section between two plate members by bonding or the like is provided in the vestibule portion 112. An arrangement has been proposed (see, for example, Patent Document 2). Since the cross section of the core member of the mat has a complicated cross section, the riverbed protection structure reduces the falling energy of overflow water and various gravel bodies falling on the mat. Excellent performance.

  Further, after a plurality of steel cylinders are arranged with respect to the vestibule portion 112, each steel cylinder is filled with concrete to form columnar bodies, and earth and sand are filled between the columnar bodies. A riverbed protective structure has also been proposed (see, for example, Patent Document 3).

JP-A-8-189024 Japanese Utility Model Publication No. 62-4570 Japanese Patent Application Laid-Open No. 2002-294652

  By the way, since the riverbed protection structure as shown in FIG. 22 and the riverbed protection structure as shown in Patent Documents 1 and 3 are configured by placing concrete on the riverbed 101, the flowing water goes underground. The water retention capacity of the formation around the sabo dam 100 is reduced. In addition, when the ground around the sabo dam 100 fluctuates due to an earthquake or the like, cracks are easily generated in the concrete, and the scouring and erosion of the riverbed 101 proceeds from these cracks. The protection structure has a problem that it lacks adaptability to riverbed changes.

  Moreover, since the riverbed protection structure shown in Patent Document 2 does not disclose a structure for connecting these mats when a plurality of mats are mounted on the riverbed 101, the riverbed 101 is scoured between the mats. It is thought that erosion will progress. In addition, when a single mat corresponding to the size of the front yard 112 is arranged in the front yard 112, it is necessary to prepare mats having different sizes depending on the scale of the sabo dam 100 and the front yard 112, There seems to be a problem of lack of workability.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is the permeability of river water flowing on the river bed to the underground, adaptability to river bed changes when an earthquake or the like occurs. The purpose of the present invention is to provide a riverbed protection structure that is excellent in workability when constructed on the riverbed and in durability when colliding with various gravel bodies.

  In order to solve the above-mentioned problems, the present inventor has a multiple sheet pile in which web portions facing each other of a first steel sheet pile and a second steel sheet pile having joints on both side edges are connected via a spacing member. By connecting the first steel sheet pile joint and the second steel sheet pile joint between the wall member and another multiple sheet pile wall member adjacent in one direction, the one direction A sheet pile wall in which the first steel sheet piles and the second steel sheet piles are alternately arranged is formed in a plurality of rows on the river bed, and a padding material is spread between the adjacent sheet pile walls. Invented the riverbed protection structure.

  That is, a riverbed protection structure according to claim 1 of the present application is a riverbed protection structure installed on a riverbed downstream of a sabo dam built up in a river, and a first steel sheet pile having joints on both side edges; The multiple sheet pile wall members in which the web portions facing each other with the second steel sheet pile are connected via the spacing member are mutually connected with the other multiple sheet pile wall members adjacent in one direction. By connecting the joint of the steel sheet pile and the joint of the second steel sheet pile, the sheet pile wall in which the first steel sheet pile and the second steel sheet pile are alternately arranged in the one direction is the river bed. A plurality of rows are formed above, and a padding material is spread between the sheet pile walls adjacent to each other.

  In addition, a riverbed protection structure according to claim 2 of the present application is a riverbed protection structure installed on a riverbed downstream of a sabo dam built up in a river, and a first steel sheet pile having joints on both side edges; The multiple sheet pile wall members in which the web portions facing each other of the second steel sheet piles are connected via the interval holding member are mutually connected with the other multiple sheet pile wall members adjacent in one direction. By connecting the joints of the steel sheet piles or the joints of the second steel sheet piles to each other, a sheet pile wall in which the first steel sheet piles or the second steel sheet piles are continuously arranged in the one direction is provided. A plurality of rows are formed on the river bed, and padding materials are spread between the sheet pile walls adjacent to each other.

  Moreover, the river-bed protection structure according to claim 3 of the present application is the river-bed protection structure according to claim 1 or 2, wherein the spacing member is a plate-like member.

  Moreover, the riverbed protection structure according to claim 4 of the present application is characterized in that in the riverbed protection structure according to claim 1 or 2, the spacing member is a rod-shaped member.

  Moreover, the riverbed protection structure according to claim 5 of the present application is the riverbed protection structure according to any one of claims 1 to 4, wherein both ends of the one spacing member are the first steel sheet pile and The second steel sheet pile is connected to a position from the center in the width direction of each web portion to one end side, and both ends of the other spacing members are connected to the first steel sheet pile and the second steel sheet pile. It is connected to the position from the center part of the width direction of each web part in a steel sheet pile to the other end side.

  Moreover, the riverbed protection structure according to claim 6 of the present application is the riverbed protection structure according to any one of claims 1 to 5, wherein the spacing member is constituted by a plate-like member, and the sheet piles adjacent to each other. Water is stored in a space surrounded by the wall surface of the wall and the side surface of the plate-like member disposed between the adjacent sheet pile walls, and a water reservoir is provided.

  Moreover, the riverbed protection structure according to claim 7 of the present application is the riverbed protection structure according to any one of claims 1 to 5, and has a sheet pile wall height higher than the sheet pile wall of the other sheet pile wall. A secondary dam sheet pile wall was constructed on the downstream side of the river, surrounded by the wall surface of the above-mentioned secondary dam sheet pile wall, the wall surface of the revetment wall provided on both sides in the width direction of the river, and the wall surface of the dam body in the above sabo dam Water is stored in the space and a water reservoir is provided.

  Moreover, the riverbed protection structure according to claim 8 of the present application is the riverbed protection structure according to any one of claims 1 to 6, wherein the plurality of rows of sheet pile walls increase in height toward the downstream side of the river. Is configured to be low.

  A method for constructing a river bed protection structure according to claim 9 of the present application is a method for constructing the river bed protection structure according to any one of claims 1 to 8, wherein a plurality of rows of the sheet pile walls are arranged. It is characterized in that it is erected sequentially from the upstream side of the river to the downstream side of the river.

  The riverbed protection structure having the structure of claims 1 and 2 of this application is mainly a padding material for the overflow water, boulders, medium pebbles and the like flowing down through the overflow section 31 of the sabo dam 3. When B collides, the fall energy can be reduced, and the river bed 5 of the front yard 33 can be prevented from being scoured and eroded by overflow water or the like. In particular, since the steel sheet piles 11 are connected only by fitting the joints 16 to each other, when the vertical ground displacement occurs, the steel sheet piles 11 appropriately slide in the vertical direction to be flexible. It can correspond to.

  Hereinafter, embodiments for implementing a river bed protection structure to which the present invention is applied will be described in detail with reference to the drawings.

First embodiment

  First, a first embodiment of a river bed protection structure 1 to which the present invention is applied will be described.

  As shown in FIGS. 1 to 3, the river-bed protection structure 1 is installed on the river bed 5 of the vestibule portion 33 located on the downstream side of the sabo dam 3 in the river.

  The sabo dam 3 in this embodiment includes a dam body 30 erected on the river bed 5 so as to cross the river width direction, and sleeve portions 32 provided on both sides of the upper end portion of the dam body 3 in the river width direction. And an overflow section 31 that is located between the sleeve sections 32 and has an upper end portion that is lower than the upper end section of the sleeve section 32 and can overflow river water and various gravel bodies flowing down from the upstream side. Consists of In addition, on both banks in the river width direction of the front garden portion 33, the ground G on both banks in the river width direction is not eroded by overflow water or the like falling to the front garden portion 33 through the overflow portion 31. A revetment wall 34 is provided as a wall. Further, a sub dam 37 is provided at a predetermined interval from the sabo dam 3 toward the downstream side of the river. The sub dam 37 is composed of a dam body 38 standing on the river 5 so as to cross the river width direction, and sleeves 39 provided on both sides of the river body in the river width direction at the upper end of the dam body 38. The height is lower than the sabo dam 30.

  The river bed protection structure 1 is composed of a plurality of rows of sheet pile walls 20 erected on the river bed 5 of the vestibule portion 33 and a padding material B spread between the adjacent sheet pile walls 20. The plurality of rows of sheet pile walls 20 are configured by connecting a plurality of multiple sheet pile wall members 10 erected on the river bed 3 of the vestibule portion 33 as shown in FIGS. 4 and 5.

  As shown in FIGS. 4 and 5, the multiple sheet pile wall member 10 includes a first steel sheet pile 11a and a second steel sheet pile 11b, which are a pair of steel sheet piles, and a spacing member 12 made of a rod-shaped member. Is done. The member 10 for multiple sheet pile walls is configured by connecting mutually opposing web portions 15 of a first steel sheet pile 11a and a second steel sheet pile 11b having joints 16 on both side edges via a spacing member 12. Is done. In addition, the 1st steel sheet pile 11a and the 2nd steel sheet pile 11b here are defined as one parameter | index at the time of classifying a pair of steel sheet pile in the member 10 for multiple sheet pile walls separately.

  The steel sheet pile 11 in this embodiment includes a web portion 15, a flange portion 18 that is inclined and extended with respect to the web portion 15 from both side edges of the web portion 15, and a joint provided at the tip of the flange portion 18. 16 and a so-called U-shaped steel sheet pile. In addition, the steel sheet pile 11 is formed with a convex portion 17 that protrudes outside the multiple sheet pile wall member 10 at the center in the width direction and extends in the longitudinal direction of the steel sheet pile 11.

  The interval holding member 12 in this embodiment is provided with male screw portions 12a that can be screwed with female screw members 13 such as nuts at both ends thereof. When the spacing member 12 is connected to the web portion 15 of the steel sheet pile 11, the female screw member 13 is screwed into the male screw portion 12 a at the end of the spacing member 12, and then the predetermined position of the web portion 15 of the steel sheet pile 11. The end portion is inserted into an insertion hole provided in advance, and another female screw member 13 is screwed to the male screw portion 12a of the end portion, and a pair of female screw members 13 screwed to the end portion are screwed. By joining, the web portion 15 is clamped by the pair of female screw members 13, and the spacing member 12 is connected to the web portion 15.

  In the multiple sheet pile wall member 10 in this embodiment, both ends of one spacing member 12 are one end from the center in the width direction of the respective web portions 15 of the first steel sheet pile 11a and the second steel sheet pile 11b. It is the position to the side, Comprising: It attaches to the position from the center part of the longitudinal direction of the web part 15 to one end side. In addition, the multiple sheet pile wall member 10 has both ends of the other spacing members 12 extending from the center portion in the width direction of the web 15 portion of each of the first steel sheet pile 11a and the second steel sheet pile 11b to the other end side. The web portion 15 is attached to a position from the center portion in the longitudinal direction to the other end side.

  The joints 16 provided on both side edges in the width direction of the steel sheet pile 11 have a symmetrical shape in the width direction of the steel sheet pile 11, and further, the first steel sheet pile 11a and the second steel sheet pile 11b are The spacing member 12 has a symmetrical shape in the longitudinal direction. When the steel sheet pile 11 is comprised from such a shape, as shown to Fig.6 (a), the 1st steel sheet pile 11a and 2nd steel toward one direction (width direction of the web part 15) are shown. While arranging a plurality of multiple sheet pile wall members 10 adjacent to each other so that the sheet piles 11b are alternately arranged, the first steel sheet piles 11a between the two multiple sheet pile wall members 10 adjacent in one direction. It becomes possible to form a row of sheet pile walls 20 by connecting the joint of the second steel sheet pile and the joint of the second steel sheet pile 11b.

  As for sheet pile wall 20 formed as mentioned above, the other 1st steel sheet pile 11a and 2nd steel sheet pile 11b which do not constitute a sheet pile wall are arranged on both sides of the wall surface which the sheet pile wall makes. become. For this reason, with respect to the joint 16 of the steel sheet piles 11a and 11b which do not constitute the sheet pile wall in the existing multiple sheet pile wall member 10, the joint 16 of the steel sheet piles 11a and 11b in the newly installed sheet pile wall member 10 is provided. By connecting, the new sheet pile wall 20 in which the first steel sheet piles 11a and the second steel sheet piles 11b are alternately arranged in one direction is formed. Then, by repeating such a procedure, a plurality of rows of sheet pile walls 20 are formed as shown in FIGS. As shown to Fig.9 (a), as for each sheet pile wall 20, the 1st steel sheet pile 11a and the 2nd steel sheet pile 11b are alternately arrange | positioned toward one direction (width direction of the web part 15). It is in the state. The plurality of rows of sheet pile walls 20 are arranged at predetermined intervals through the interval holding member 12 in a direction substantially orthogonal to one direction (an extending direction of the interval holding member 12).

  In addition, when forming the sheet pile wall 20 using the member 10 for multiple sheet pile walls, as shown in FIG.6 (b), part of the steel sheet pile 11 which comprises the sheet pile wall 20 is in the member 10 for multiple sheet pile walls. It may replace with the steel sheet pile 11 and you may comprise as the other steel sheet pile 22 which is not connected with the space | interval holding member 12. FIG. This other steel sheet pile 22 consists of the structure similar to the steel sheet pile 11 in the member 10 for multiple sheet pile walls.

  Moreover, as shown in FIG.6 (c), as for the member 10 for multiple sheet pile walls, the web part 15 of the 1st steel sheet pile 11a and the 2nd steel sheet pile 11b arrange | positioned facing each other is substantially the same. They may be connected in an aligned state. When the sheet pile wall 20 is constructed by the multiple sheet pile wall member 10 having such a configuration, the first steel sheet piles 11a are alternately arranged continuously in one direction (the width direction of the web portion 15). By connecting the joints of the first steel sheet piles 11a between the two multiple sheet pile wall members 10 adjacent in one direction while arranging the multiple sheet pile wall members 10 adjacent to each other, A row of sheet pile walls 20 can be formed.

  In the sheet pile wall 20 thus formed, another second steel sheet pile 11b that does not constitute the sheet pile wall is disposed on both sides of the wall surface formed by the sheet pile wall. For this reason, by connecting the joint of the steel sheet pile 11b in the new multiple sheet pile wall member 10 to the second steel sheet pile 11b that does not constitute the sheet pile wall in the existing multiple sheet pile wall member 10, The sheet pile wall 20 in which the second steel sheet piles 11b are continuously arranged in one direction can be formed. Then, by repeating such a procedure, as shown in FIG. 9B, a plurality of rows of sheet pile walls 20 are formed. As shown in FIG. 9B, each sheet pile wall 20 is in a state in which the first steel sheet pile 11a or the second steel sheet pile 11b is continuously arranged in one direction.

  The plurality of rows of sheet pile walls 20 thus formed are actually arranged on the river bed 5 of the vestibule portion 33 located on the river flow side of the sabo dam 3. Below, the method of constructing the river bed protection structure 1 on the river bed 5 of the vestibular part 33 will be described, including the procedure for constructing a plurality of rows of sheet pile walls 20 on the river bed 5 of the front garden part 33.

  First, as shown in FIGS. 10 (a) and 11 (a), the sheet pile wall 20 in the first row is extended on the river bed 5 of the vestibule portion 33 in the vicinity of the dam body 30 so as to extend in the river width direction. To construct. The first sheet pile wall 20 in the vicinity of the sabo dam 3 connects the first steel sheet pile 11a in the multiple sheet pile wall member 10 and the other steel sheet piles 22 not connected by the spacing member 12 to each other. While the joints 16 are connected, they are formed alternately in the river width direction. In this case, the steel sheet piles 11, 22 are arranged by pushing the lower portions of the steel sheet piles 11, 22 into the river bed 5. At this time, the steel sheet piles 11 and 22 are erected so that the upper part protrudes from the surface of the river bed 5 by a predetermined length.

  Next, as shown in FIGS. 10 (b) and 11 (b), with respect to the joint 16 of the second steel sheet pile 11b of the existing multiple sheet pile wall member 10 constituting the sheet pile wall 20 in the first row. Then, by connecting the joint 16 of the newly provided member for multiple sheet pile walls 10, the second row sheet pile wall 20 extending in the river width direction is formed. The second sheet pile wall 20 is formed by alternately arranging the first steel sheet piles 11a and the second steel sheet piles 11b in the river width direction.

  In the third row and thereafter, the same procedure as that for constructing the sheet pile wall 20 in the second row is sequentially repeated from the upstream side to the downstream side of the river, and as shown in FIG. 10 (c). The sheet pile wall 20 in which the first steel sheet piles 11a and the second steel sheet piles 11b are alternately arranged in the river width direction is disposed on the river bed 5 through the gap holding member 12 in the river flow direction. Thus, a plurality of rows are formed.

  After constructing a plurality of rows of sheet pile walls 20, as shown in FIG. 11C, the riverbed protection structure 1 is constructed by spreading the interlining material B between the adjacent sheet pile walls 20. As shown in FIG. 2, the padding material B may be spread in a space formed after removing a predetermined amount of soil and sand from the riverbed 5 located between the sheet pile walls 20. It may be arranged directly on the floor.

  The riverbed protection structure 1 constructed in this way is mainly composed of the interstitial material B against the gravel bodies such as overflow water, boulders, medium pebbles and the like flowing down through the overflow section 31 of the sabo dam 3. By colliding, the fall energy can be reduced, and the riverbed 5 of the front yard 33 can be prevented from being scoured and eroded by overflow water or the like. In this case, the plurality of rows of wall bodies 20 constructed by the multiple sheet pile wall members 10 are arranged so that the filling material B is prevented from flowing out due to the overflow water flowing down and flowing out downstream. The function to hold down between the wall bodies 20 is exhibited.

  In particular, the riverbed protection structure 1 to which the present invention is applied is such that the steel sheet piles 11 can be slid in the vertical direction because the steel sheet piles 11 are connected only by fitting the joints 16 to each other. For this reason, when the ground fluctuation around the sabo dam 3 occurs due to an earthquake or the like, and the displacement of the ground in the vertical direction occurs, each steel sheet pile 11 appropriately slides in the vertical direction to flexibly cope with the ground fluctuation of the riverbed.

  In addition, when each boulder or the like flowing down from the sabo dam 3 collides with each steel sheet pile 11, only the steel sheet pile 11 colliding with the boulder or the like absorbs the fall energy while appropriately sliding in the vertical direction. The impact due to the collision is not transmitted to the steel sheet pile 11. For this reason, the damage caused by the collision with the boulder can be limited to a part, and the steel sheet pile 11 damaged by the collision is extracted from the river bed 5 and is easily repaired by pushing the other steel sheet pile 11 again. It can be carried out.

  In addition, since the plurality of rows of sheet pile walls 20 are configured to be connected to each other by the spacing member 12 while being pushed into the river bed 5, they are extremely excellent in horizontal strength, and by overflow water and various gravel bodies. Difficult to flow downstream.

  In addition, such a river bed protection structure 1 is constructed by constructing a plurality of rows of sheet pile walls 20 that are substantially parallel to each other by combining a single multiple sheet pile wall member 10 and then spreading the interlining material B. Therefore, it is very excellent in workability. In particular, the range in which the riverbed protection structure 1 is constructed can be freely adjusted by increasing or decreasing the number of the multiple sheet pile wall members 10 to be combined and adjusting the length and the number of rows of the sheet pile walls 20, so that the sabo dam 3 In addition, the riverbed protection structure 1 can be constructed without being limited by the scale of the vestibule portion 33.

  Further, the riverbed protection structure 1 to which the present invention is applied has a configuration in which a plurality of rows of sheet pile walls 20 are arranged upright on the riverbed 5 and the padding material B is only spread. Therefore, the river water can easily penetrate into the lower part of the vestibule 33 and maintain the water retention capacity around the sabo dam 3.

  Further, unlike the conventional riverbed protection structure, the riverbed protection structure 1 to which the present invention is applied does not use concrete. For this reason, when disasters such as debris flows or earthquakes due to heavy rain or typhoons occur and the riverbed protection structure 1 is damaged, it is not necessary to place concrete or piles when the riverbed protection structure 1 is restored. Is possible.

  Below, the detail of each component of the river-bed protection structure 1 to which this invention is applied is demonstrated.

  The sabo dam 3 to which the present invention is applied is an overflow dam of a type in which overflow water and various gravel bodies are overflowed at the upper part of the levee body and these overflow water is dropped to the vestibule portion 33. Become. The sabo dam 3 can be applied to either an impermeable dam or a transmissive dam.

  Specifically, as shown in the above-described embodiment, a concrete dam whose concrete wall is made of concrete, a fill dam whose dam body is made of soil or rock, and a steel frame sabo that is made of a steel frame. It is embodied by a dam. The sabo dam 3 embodied by these may be provided with a slit as appropriate, or may be constructed in an arch shape.

  The steel frame sabo dam here refers to a sabo dam constituted by a steel frame structure described in, for example, JP-A No. 2003-328341. In this steel frame structure, box frames formed by joining column members, horizontal members, etc., to each other are continuously formed in the left, right, front and back directions, and screen materials are provided on the front and rear surfaces of these box frames. In addition, the box frame is filled with filling material. A steel frame sabo dam that is constructed to have the same shape as a sabo dam (sabo dam) is called a steel frame sabo dam.

  Moreover, the steel sheet pile 11 in the member 10 for multiple sheet pile walls may be comprised from the hat-shaped steel sheet pile, the Z-shaped steel sheet pile, and the linear steel sheet pile other than a U-shaped steel sheet pile. Even when any steel sheet pile is used, the desired effects as described above can be obtained. The steel sheet pile 11 may be formed by hot rolling or may be formed by cold rolling.

  Further, the joints 16 provided on both side edges in the width direction of the steel sheet pile 11 do not have a symmetrical shape in the width direction of the steel sheet pile 11 so that one joint 16 and the other joint 16 can be fitted. The pair of joints 16 may be adjusted so as to have a point-symmetric shape.

  Moreover, it is desirable that the steel sheet piles 11 in the sheet pile wall 20 are connected in a state in which the joints 16 are loosely fitted. In this case, the shape of each joint 16 is adjusted in advance so that it can be loosely fitted.

  When adjusted in this way, as shown in FIG. 12 (a), the two steel sheet piles 11 connected via the joint 16 are maintained in the connected state in the direction A while maintaining the connected state. As shown in FIGS. 12 (b) and 12 (c), it can be rotated or moved in a direction B that is the width direction of the steel sheet pile 11 and a direction C that is the extension direction of the spacing member 12. For this reason, as shown in FIG. 12 (d), when the ground changes around the sabo dam 3 due to an earthquake or the like and the horizontal displacement of the ground occurs, each steel sheet pile 11 has a certain width through the joint 16. And can respond to ground changes more flexibly. Incidentally, since it can move flexibly with respect to the displacement in the vertical direction and the displacement in the horizontal direction, the steel sheet piles 11 in the vertical direction have the collision energy caused by the collision with the boulders falling through the overflow section. In addition to sliding, it can be absorbed by moving horizontally.

  Further, in the riverbed protection structure 1, it is preferable to use stones, gravel or earth and sand generated locally on the padding material B spread between the sheet pile walls 20, but chestnut stones imported from other places, or architecture, civil engineering It is also possible to use waste materials and the like. In particular, the interlining material B is preferably configured to have a size and a weight that do not easily flow due to the overflow water flowing down through the overflow section 31, thereby It is possible to more strongly prevent the river bed 5 located in the area from being scoured and eroded.

  In the case where the upper end portion of the spacing member 12 is attached so as to be located below the upper end portion of the steel sheet pile 11 as in the present embodiment, the padding material B covers the upper end portion of the spacing member 12. It is desirable that it is spread over. Thereby, when the gravel body has fallen via the overflow part 31 grade | etc., The padding material B will collide with various gravel bodies instead of the space | interval holding member 12, and the space | interval by collision with various gravel bodies It becomes possible to prevent the holding member 12 from being damaged.

  In addition, it is desirable that the interval between the sheet pile walls 20 is short, so that the padding material B spread between the sheet pile walls 20 is not easily biased by overflow water or the like, and can stably prevent scouring and erosion of the riverbed 5. . However, when this interval is too short, the number of materials such as the steel sheet pile 11 and the interval holding member 12 to be used increases, which is not desirable because the cost increases.

  Moreover, in this Embodiment, the sheet pile wall 20 is comprised by connecting the some steel sheet pile 11 continuously toward a river width direction, and, thereby, the sheet pile wall 20 is extended in a river width direction. Configured as described. However, in the present invention, it is not necessarily limited to extend in such a direction, a plurality of steel sheet piles 11 are continuously connected in a direction inclined with respect to the river width direction, The sheet pile wall 20 may be extended in a direction inclined with respect to the river width direction. In addition, when the sheet pile wall 20 is configured to be extended in the river width direction, the sheet pile wall 20 is provided substantially orthogonal to the flow path direction of the river. There is an advantage that the interlining material B is stable and easily stops in place.

  Further, in the riverbed protection structure 1, the sheet pile wall 20 and the padding material B are expected to directly fall overflow water and various gravel bodies with respect to the vestibule portion 33 through the overflow portion 31. It is desirable to arrange such that at least the range and the range where the riverbed 5 is expected to be indirectly scoured and eroded by this due to the occurrence of a jumping phenomenon due to the overflow and the overflow water that has fallen.

  Moreover, when constructing the riverbed protection structure 1, it is desirable that a plurality of rows of sheet pile walls 20 are erected sequentially from the upstream side of the river toward the downstream side of the river. This is because when the riverbed protection structure 1 is constructed, an operator who stands up a plurality of rows of sheet pile walls 20 works while moving on the riverbed 5 from the downstream side toward the upstream side. This is because the sheet pile wall 20 does not become an obstacle to movement and the workability is improved.

  Moreover, in this invention, you may make it apply the members 40A-C for multiple sheet pile walls as shown in FIG. 13 as an alternative of the member 10 for multiple sheet pile walls. In addition, about the structure same as the member 10 for multiple sheet pile walls, while attaching | subjecting the same code | symbol, the description is abbreviate | omitted.

  FIG. 13A shows the configuration of the multiple sheet pile wall member 40A. In the multiple sheet pile wall member 40A, a gap holding member 41 made of a steel plate member is used instead of the gap holding member 12 made of a rod-like member of the multiple sheet pile wall member 10. The interval holding member 41 made of this plate-like member has both end edges fixed to the convex portion 17 of the steel sheet pile 11 by welding or the like. The spacing member 41 made of this plate-like member is constituted by a length in the height direction substantially the same as the length in the longitudinal direction of the steel sheet pile 11 when standing.

  Thus, when the space | interval holding member 41 is comprised with a plate-shaped member, a partition is provided between the sheet pile walls 20 adjacent to each other. As a result, the movement of the interlining material B spread between the sheet pile walls 20 is restrained, and the interlining material B can be held between the wall bodies 20 more firmly.

  In addition, as above-mentioned, when attaching the upper end part of this space | interval holding member 41 so that it may be located below the upper end part of the steel sheet pile 11, it covers so that the padding material B may cover the upper end part of the space holding member 41 If spread, it becomes possible to prevent damage to the spacing member 41 due to collision with various gravel bodies.

  FIG.13 (b) has shown the structure of the member 40B for multiple sheet pile walls. The multi-sheet pile wall member 40B has a gap holding member 42 made of a belt-like member whose length in the height direction at the time of standing is shorter than the gap holding member 41 from the plate-like member in the multi-sheet pile wall member 40A. In the height direction, a plurality of parts are attached.

  As described above, when the interval holding member 42 is formed of a belt-like member, the manufacturing cost and the material cost can be reduced as compared with the case where a plate-like member is attached as the interval holding member 41. In addition, the weight is reduced as compared with the case where the interval holding member 41 is a plate-like member, and accordingly, the conveyance cost is reduced, and the work can be easily performed, and the workability is improved. .

  FIG.13 (c) has shown the structure of the member 40C for multiple sheet pile walls. The multiple sheet pile wall member 40C is obtained by further increasing the number of rod-shaped members of the multiple sheet pile wall member 10. As a result, the first steel sheet pile 11a and the second steel sheet pile 11b in the multiple sheet pile wall member 40C are firmly connected.

  Incidentally, it is desirable that the spacing member is composed of a rod-shaped member from the viewpoints of transportability and workability. This is because the steel sheet piles 11 with the spacing members 12 removed can be stacked in a plurality of stages and transported to the site, and the spacing members 12 can be connected to the steel sheet piles 11 by the female screw members 13 at the site. It is because it becomes. In consideration of the balance between cost and strength, it is most desirable that only two spacing members 12 made of rod-like members are attached to the steel sheet pile 11 as shown in FIG. In this case, the weight of the multiple sheet pile wall member is reduced, the conveyance cost is reduced, and the workability is further improved.

  Next, another embodiment of the river bed protection structure to which the present invention is applied will be described. In addition, about the same structure as the river bed protection structure 1 in 1st Embodiment, while attaching | subjecting the same code | symbol, the description is abbreviate | omitted.

Second embodiment

  FIG. 14A shows a side sectional view of a river bed protection structure 50A as the second embodiment.

  In this river bed protection structure 50A, the plurality of rows of sheet pile walls 20 are configured such that the heights thereof become lower toward the downstream side of the river. Along with this, the height of the space between the sheet pile walls 20 laid by the space between the sheet piles B becomes lower toward the downstream side of the river, and the space between the space layers is arranged stepwise. Will be.

  In this case, before the sheet pile wall 20 is erected, the embankment is previously filled on the river bed 5 and is constructed in a staircase shape so that the height of the river bed 5 decreases toward the downstream side of the river. The sheet pile wall 20 is sequentially constructed from the upstream side of the river toward the downstream side.

  As shown in FIG. 14B, the multiple sheet pile wall member 51 used for constructing such a sheet pile wall 20 is the height in the longitudinal direction of the first steel sheet pile 11a and the second steel sheet pile 11b. Are different, and the first steel sheet pile 11a is extended upward in the longitudinal direction, and the second steel sheet pile 11b is extended downward in the longitudinal direction. In addition, the multiple sheet pile wall member 51a disposed on the most upstream side is configured such that the upper end portion of the first steel sheet pile 11a and the upper end portion of the second steel sheet pile 11b have substantially the same height. The member for multiple sheet pile walls 51b arranged on the most downstream side is formed such that the lower end portion of the first steel sheet pile 11a and the lower end portion of the second steel sheet pile 11b have substantially the same height.

  The riverbed protection structure 50A having such a configuration can reduce the falling energy of overflow water flowing down through the overflow portion 31 for each step of the interlining material layer arranged in a staircase shape. It has become. The river bed protection structure 50B is effective when the overflow portion 31 of the sabo dam 3 is too high and the falling energy such as overflow water cannot be sufficiently attenuated by the padding material B.

Third embodiment

  FIG. 15 shows a side cross-sectional view of a river bed protection structure 50B as the third embodiment. FIG. 16 is a plan view of the river bed protection structure 50B.

  In this river bed protection structure 50B, similarly to the river bed protection structure 50A, a plurality of rows of sheet pile walls 20 are configured such that the height thereof decreases toward the downstream side of the river. Further, in this river bed protection structure 50B, the interval holding member 41 is constituted by a plate-like member as shown in FIG. In this river bed protection structure 50B, as shown in FIG. 16, the wall surfaces of the sheet pile walls 20 adjacent to each other and the side surfaces of the spacing members 41 made of plate-like members arranged between the sheet pile walls 20 adjacent to each other. In the enclosed space, a water reservoir W1 is provided by storing water such as river water.

  In this riverbed protection structure 50B, not only the padding material B but also the water reservoir W1 collides with overflow water flowing down through the overflow part 31, and the padding material B and Drop energy such as overflow water is reduced by the water reservoir W1. For this reason, compared with the case where only the padding material B is provided, it becomes possible to more reliably prevent scouring and erosion of the river bed 5 of the vestibular part 33.

  In addition, when storing river water etc. between the sheet pile walls 20 in this way, the connection part of each steel sheet pile 11 in the sheet pile wall 20 raises the fitting intensity | strength between the couplings 16, or interposes a water stop material. By doing so, it is desirable to improve the water stoppage at the connecting portion.

  Moreover, such a water reservoir W1 includes not only the case where the plurality of rows of sheet pile walls 20 are configured such that the height thereof decreases toward the downstream side of the river, but also as illustrated in FIG. Of course, the present invention may be applied to the case where the heights of the sheet pile walls 20 in the row are substantially the same.

  Further, in this river bed protection structure 50B, it is sufficient that the spacing member 41 composed of at least two plate-like members is disposed between the adjacent sheet pile walls 20, and is thereby surrounded by each surface. Water can be stored in the open space.

Fourth embodiment

  FIG. 17 shows a side cross-sectional view of a riverbed protection structure 50C as the fourth embodiment. FIG. 18 shows a plan view of the river bed protection structure 50C.

  In this river bed protection structure 50C, the height of the sheet pile wall 20c located on the downstream side of the river is configured to be higher than the height of the sheet pile wall 20d of the other sheet pile wall 20d. It is functioning as. Hereinafter, this sheet pile wall 20c is referred to as a sub weir sheet pile wall 20c.

  Unlike the other sheet pile walls 20d, the sub dam sheet pile wall 20c is configured such that both ends thereof protrude toward the both sides in the river width direction with respect to the revetment wall 34 in the front yard 33. In the riverbed protection structure 50C, the upstream wall surface of the sub weir sheet pile wall 20c, the wall surface of the revetment wall 34 provided on both sides in the width direction of the river, and the downstream side of the bank body 30 in the sabo dam 3 are shown. A water reservoir W2 is provided by storing water such as river water in a space surrounded by the wall surface.

  The riverbed protection structure 50C configured as described above has a deeper water depth than the water reservoir W1 in the riverbed protection structure 50B, and the water reservoir W2 is provided over a wide range. Accordingly, scouring and erosion of the river bed 5 over a wider range can be prevented.

  In this embodiment, after embedding soil, sand, etc. between the two rows of sheet pile walls 20c located on the most downstream side of the river, the padding material B is spread between the sheet pile walls 20c. The sub dam 35 is used. And the horizontal proof stress with respect to the horizontal water pressure by the stored water is improved with these two rows of sheet pile walls 20c and embanked soil.

Fifth embodiment

  FIG. 19 shows a side cross-sectional view of a river bed protection structure 50D as the fifth embodiment. FIG. 20 is a partially cutaway plan view of the river bed protection structure 50D.

  In this riverbed protection structure 50D, as an alternative to the sabo dam 3 in the first embodiment, a sabo dam is a sheet pile dam 60 constructed of steel sheet piles.

  As with the sabo dam 3 in the first embodiment, the sheet pile dam 60 includes a dam body 65 standing on the river bed 5 so as to cross the river width direction, and a river width at the upper end of the dam body 65. It is located between the sleeve portions 62 provided on both sides in the direction, and the upper end portion of the sleeve portion 62 is configured to be lower than the upper end portion of the sleeve portion 62 so that the river water flowing down from the upstream side can be overflowed. And an overflow section 61.

  The outer wall 64 on the downstream side of the sheet pile weir 60 is configured by assembling steel sheet piles 66 in a staggered arrangement as shown in FIG. Similarly, the outer wall 64 on the upstream side of the sheet pile dam 60 is constructed by assembling steel sheet piles 66 in a staggered arrangement, and concrete is placed between the outer wall 64 on the upstream side and the downstream side, or soil The filling body 68 is provided by spreading sand, earth and sand, boulders and the like. Further, a top plate 63 that protects the upper portion of the sheet pile dam 60 is attached to the upper portion of the filling body 68. The top plate 63 is embodied by placing concrete or attaching a steel plate or the like.

  Further, the side wall surface constituting the overflow section 61 is formed of a steel plate 67. The steel plate 67 is configured such that the distance between the pair of steel plates 67 in the overflow portion 61 becomes narrower from the upstream side toward the downstream side.

  In the riverbed protection structure 50D according to the fifth embodiment, as shown in FIG. 21, a sheet pile wall in which a part of the steel sheet pile 66 of the downstream outer wall 64 of the sheet pile dam 61 is disposed in the vestibule portion 33. It is configured to be connected to 20 steel sheet piles 11. Thus, by using the member 10 for multiple sheet pile walls, it is possible to construct not only the sheet pile wall 20 in the front yard 33 but also the sabo dam.

It is a front view of a sabo dam with a riverbed protection structure. It is side surface sectional drawing of the sabo dam with the riverbed protection structure. It is a schematic plan view of a sabo dam with a riverbed protection structure. It is a perspective view of the member for multiple sheet pile walls. (a) is a side view of the member for multiple sheet pile walls, and (b) is a plan view thereof. It is a top view which shows the example of the sheet pile wall constructed | assembled by connecting the several member for multiple sheet pile walls. It is a perspective view which shows two rows of sheet pile walls constructed | assembled by connecting the member for multiple sheet pile walls. It is a top view which shows two rows of sheet pile walls constructed | assembled by connecting the member for multiple sheet pile walls. It is a top view which shows the sheet pile wall of several rows comprised by connecting the member for multiple sheet pile walls. It is a figure for demonstrating the method of constructing a river-bed protection structure. It is a figure for demonstrating the method of constructing a river-bed protection structure. It is a figure for demonstrating the effect at the time of connecting each steel sheet pile in a sheet pile wall in the state by which the mutual coupling was loosely fitted. It is a figure for demonstrating other embodiment of the member for multiple sheet pile walls. It is side surface sectional drawing which shows 2nd Embodiment of a river-bed protection structure. It is side surface sectional drawing which shows 3rd Embodiment of a river-bed protection structure. It is a top view which shows 3rd Embodiment of a river-bed protection structure. It is side surface sectional drawing which shows 4th Embodiment of a river-bed protection structure. It is a top view which shows 4th Embodiment of a river-bed protection structure. It is side surface sectional drawing which shows 5th Embodiment of a river-bed protection structure. It is a partially cutaway top view which shows 5th Embodiment of a river-bed protection structure. It is a schematic front view which shows the arrangement | positioning state of the steel sheet pile in the outer wall of the downstream of a sheet pile dam. It is a figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 River bed protection structure 3 Sabo dam 5 River bed 10 Multiple sheet pile wall member 11 Steel sheet pile 12 Spacing member 13 Female thread member 15 Web part 16 Joint 17 Convex part 18 Flange part 20 Sheet pile wall 22 Steel sheet pile 30, 38 Levee body 31 Flow part 32, 39 Sleeve part 33 Vestibule part 34 Revetment wall 37 Sub dam 40A, 40B, 40C Multiple sheet pile wall member 41 Spacing member (plate member)
42 Spacing member (band member)
50A, 50B, 50C, 50D Riverbed protection structure 51, 52 Multiple sheet pile wall member 60 Sheet pile dam 61 Overflow portion 62 Sleeve portion 63 Top plate 64 Outer wall 65 Dam body 66 Steel sheet pile 67 Steel plate B Filling material 100 Sabo dam 101 River bed 110 Sleeve part 111 Overflow part 112 Vestibule part 113 Water hitting 120 Sub dam 121 Dyke body 122 Sleeve part

Claims (9)

In the riverbed protection structure installed on the riverbed downstream of the sabo dam built up in the river,
A multiple sheet pile wall member in which the web portions facing each other of the first steel sheet pile and the second steel sheet pile having joints on both side edges are connected via a spacing member is connected to another multiple adjacent in one direction. By connecting the joint of the first steel sheet pile and the joint of the second steel sheet pile between the sheet pile wall members, the first steel sheet pile and the second steel sheet pile in the one direction. The sheet pile wall in which is alternately arranged is formed in a plurality of rows on the river bed,
A riverbed protection structure, characterized in that a padding material is spread between the sheet pile walls adjacent to each other. In the riverbed protection structure installed on the riverbed downstream of the sabo dam built up in the river,
Other multiple sheet piles adjacent in one direction to a member for a multiple sheet pile wall in which web portions facing each other of a first steel sheet pile and a second steel sheet pile having joints on both side edges are connected via a spacing member By connecting the joints of the first steel sheet piles with each other or the joints of the second steel sheet piles with each other to the wall member, the first steel sheet pile or the second one is directed toward the one direction. A sheet pile wall in which steel sheet piles are continuously arranged is formed in a plurality of rows on the river bed,
A riverbed protection structure, characterized in that a padding material is spread between the sheet pile walls adjacent to each other. The riverbed protection structure according to claim 1 or 2, wherein the spacing member is a plate-like member. The riverbed protection structure according to claim 1 or 2, wherein the spacing member is a rod-shaped member. Both ends of the one spacing member are connected to positions from the center in the width direction to one end of each web portion in the first steel sheet pile and the second steel sheet pile, and the other spacing. The both ends of a holding member are connected to the position from the center part of the width direction of each web part in the said 1st steel sheet pile and the said 2nd steel sheet pile to the other end side. 5. The riverbed protective structure according to any one of 4 above. The spacing member is composed of a plate member,
The water is stored in a space surrounded by the wall surfaces of the sheet pile walls adjacent to each other and the side surface of the plate-like member disposed between the sheet pile walls adjacent to each other, and a water reservoir is provided. Item 6. The riverbed protective structure according to any one of items 1 to 5. A sheet pile wall for the sub weir consisting of a sheet pile wall height higher than the sheet pile wall height of the other sheet pile wall is constructed on the downstream side of the river,
Water is stored in a space surrounded by the wall surface of the sheet pile wall for the sub dam, the wall surface of the revetment wall provided on both sides in the width direction of the river, and the wall surface of the dam body in the sabo dam, and a water reservoir is provided. The riverbed protective structure according to any one of claims 1 to 5, wherein: The riverbed protection structure according to any one of claims 1 to 6, wherein the plurality of rows of sheet pile walls are configured such that a height thereof decreases toward a downstream side of the river. A method for constructing the river bed protection structure according to any one of claims 1 to 8,
A method for constructing a riverbed protection structure, wherein a plurality of rows of the sheet pile walls are sequentially erected from the upstream side of the river toward the downstream side of the river.

Images