JP2010059647A - Steel slit dam and method of repairing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel slit dam of such a structure that can reduce material cost by minimizing the wasteful use of material when a coarse fragment arresting member is attached to a slit dam body. <P>SOLUTION: This steel slit dam includes a coarse fragment arresting member 5 having: a plurality of column members 31 having circular steel pipes 30 arranged generally parallel to each other at intervals in the river lateral direction; a pair of side frames 51 the outer surfaces 55 of which, respectively, face the mutually opposed upstream side outer peripheral surfaces 30a of two column members adjacent to each other among the plurality of column members 31; and a horizontal beam 53 installed between the pair of side frames 51. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a steel slit dam suitable for river debris flow countermeasures or driftwood countermeasures, and a repair method therefor.

  Conventionally, various types of steel slit dams have been proposed in rivers. This steel slit dam is designed to increase the sand storage capacity upstream of the dam by actively passing medium and small gravels such as soil and sand with relatively small particle size from the flowed material flowing down the river. While securing, only gravel with a large particle size, driftwood, etc. are captured, and it is possible to prevent such large gravel from flowing out to the downstream side.

  FIGS. 13 and 14 show an example of a typical embodiment of such a steel slit dam 100. The steel slit dam 100 includes a concrete structure 101 formed at an interval in the river width direction of the river R, and a slit dam body 102 disposed between the concrete structures 101. The slit dam main body 102 is formed as a unit body having a frame structure in which a plurality of steel pipe members 103 are combined, and a column member 121 standing on the concrete foundation 104 and a column adjacent to the flow direction of the river R The depth member 123 erected between the members 121 and the horizontal member 125 erected between the column members 121 adjacent in the river width direction of the river R are provided.

  In the steel slit dam 100, boulders can be captured mainly by the column member 121 arranged on the upstream side, and medium and small gravels are allowed to permeate.

  In recent years, a slit made of steel having improved gravel trapping performance by further providing a gravel trapping member that facilitates trapping of medium and small gravel on the slit dam body 102 composed of such a plurality of steel pipe members. A dam 100 has been proposed (see, for example, Patent Documents 1 and 2).

  In Patent Document 1, by attaching a gap forming member made of a ring net, expanded metal, H-shaped steel, or the like to the upstream side of the slit dam body, the grids formed by the steel pipe members of the slit dam body A configuration is disclosed in which small lattices are formed on the upstream side of the slit dam body, thereby facilitating the capture of various gravel bodies.

  In Patent Document 2, it is easy to capture medium and small pebbles by attaching a medium and small pebbles trapping member composed of a plurality of vertical beams and horizontal beams as they are or in a lattice pattern to the upstream side of the slit dam body 102. The configuration described above is disclosed.

Japanese Patent Laying-Open No. 2005-201019 JP 2007-191936 A

  However, the gap forming member as the H-shaped steel disclosed in Patent Document 1 and the gravel body capturing member such as the small and medium gravel capturing member disclosed in Patent Document 2 cross the circular steel pipe of the slit dam body from the upstream side. It has a structure that covers it. This means that the circular steel pipe of the slit dam body and the gravel body capturing member, which is a member having a function of capturing gravel bodies, are used twice at the intersection, and in that amount steel Wasted materials are used to construct the slit dam, which has led to a rise in material costs. Moreover, in such a structure, there exists a problem that the steel pipe member of a slit dam main body cannot fully exhibit the impact absorption function with respect to the collision load from various gravel bodies.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to attach a gravel body capturing member that makes it easy to capture medium and small gravel to the slit dam body. It is an object of the present invention to provide a steel slit dam having a structure capable of reducing the use of useless members as much as possible and reducing the material cost accordingly, and a repair method thereof.

  In order to solve the above-described problem, the inventor of the present application has a plurality of column members made of circular steel pipes spaced in parallel in the river width direction and two adjacent columns among the plurality of column members. It comprises a gravel body capturing member having a pair of side frames provided with their outer surfaces facing each other on the upstream outer peripheral surfaces facing each other, and a horizontal rail constructed between the pair of side frames. Invented a steel slit dam.

  A steel slit dam according to claim 1 of the present invention is a steel slit dam arranged between civil engineering structures formed at intervals in a river width direction of a river, and provided substantially in parallel with an interval in the river width direction. A plurality of column members made of circular steel pipes, and a pair of side frames provided with their respective outer surfaces facing each other on the upstream outer peripheral surfaces facing each other of two adjacent column members among the plurality of column members; It is provided with the gravel body capture member which has a horizontal rail constructed between said pair of side frames.

  In the steel slit dam according to claim 2 of the present application, in the invention according to claim 1 of the present application, the outer surfaces of the pair of side frames are formed from curved surfaces having shapes corresponding to the upstream outer peripheral surfaces of the two column members. It is characterized by.

  The steel slit dam according to claim 3 of the present invention is the invention according to claim 1 or 2, wherein the pair of side frames are in a collision between a gravel body flowing down from the upstream side of the river and the horizontal rail, The outer surface of the said side frame is provided in the state which can be slid with respect to the upstream outer peripheral surface of said two pillar member, It is characterized by the above-mentioned.

  The steel slit dam according to Claim 4 of the present invention is the invention according to any one of Claims 1 to 3, wherein the pair of side frames includes a flange piece at a lower end or an upper end thereof, and a lower part of the flange piece or A bolt is inserted into an insertion hole formed in a bracket provided on the column member at the upper side, and is provided on the upstream outer peripheral surface of the two column members.

  The steel slit dam according to claim 5 of the present application is the invention according to any one of claims 1 to 4, wherein the gravel body capturing member is a plurality of horizontal rails installed between the pair of side frames. It is characterized by having.

  The inventor of the present application is a repair method of a steel slit dam for repairing a damaged horizontal rail of the steel slit dam according to any one of claims 1 to 5, wherein the damaged gravel body capturing member is a member of the two column members. The method for repairing a steel slit dam according to claim 6 of the present invention is characterized in that the gravel body capturing member newly prepared is disposed between the two column members.

  Moreover, this inventor is used for the steel slit dam of Claims 1-5, and has the said pair of side frame and the said horizontal crosspiece, The gravel body concerning this Claim 7 characterized by the above-mentioned. A capture member was invented.

  According to the first aspect of the present invention, the gravel body capturing member 5 has a pair of side frames 51 on the upstream outer peripheral surface 30a facing each other of the plurality of pillar members 31 provided in parallel with a gap in the river width direction. And a horizontal beam 53 having a gravel trapping function is installed between the pair of side frames 51. For this reason, it is possible to make it the structure where the upstream of the column member 31 which is a member which has a gravel body capture function is not covered with the crosspiece 53, and the useless use of the member which has a gravel body capture function was suppressed. The structure can be obtained, and the material cost can be reduced.

  According to the invention of claim 1, when various gravel bodies collide with the crosspiece 53, the slit dam body 3 while relaxing the impact force transmitted from the gravel bodies to the gravel body capturing member 5 by the frictional resistance. It is possible to improve the shock absorption performance and durability of the steel slit dam 1 against various gravel bodies. Moreover, although the gravel body capture | acquisition member 5 in this invention is being fixed to the column member 31 by simple structure, it can exhibit the gravel body capture | acquisition function over a long period of time. In addition, a low strength, low rigidity, and small-sized member can be used for the horizontal beam 53 on the assumption that the horizontal beam 53 is deformed, and thereby the material cost of the steel slit dam 1 can be reduced. It has become.

  Moreover, according to the invention which concerns on Claim 4 of this application, when attaching the gravel body capture | acquisition member 5 to the slit dam main body 3, it becomes possible to work, performing positioning work easily. Further, the gravel body capturing member 5 can be moved to the two column members without preventing the pair of side frames 51 of the gravel body capturing member 5 from sliding on the upstream outer peripheral surface 30a of the column member 31 at the time of collision with the gravel body. It is possible to fix between 31.

  Further, according to the invention according to claim 5 of the present application, it is possible to reduce the trouble of installing a plurality of horizontal rails 53 one by one between the two column members 31.

  Hereinafter, the form for implementing the steel slit dam to which this invention is applied is demonstrated in detail, referring drawings.

  FIG. 1 shows a partial cross-sectional front view of a steel slit dam 1 according to the present invention, and FIG. 2 shows a cross-sectional view taken along line AA of FIG.

  The steel slit dam 1 is arranged between a civil engineering structure 7 made of concrete or the like formed at an interval in the river width direction of the river R and the civil engineering structure 7, and a plurality of circular steel pipes 30 having a circular cross section are combined. And a slit dam body 3 having a frame structure to be formed. The slit dam body 3 is disposed on the concrete foundation 9 between the civil engineering structures 7. A plurality of gravel body capturing members 5 having a pair of side frames 51 and a plurality of horizontal rails 53 installed between the pair of side frames 51 are attached to the steel slit dam 1. ing.

  FIG. 3 shows a partial cross-sectional front view of the slit dam body 3, and FIG. 4 shows a cross-sectional view taken along the line BB of FIG.

  The slit dam body 3 in the present embodiment includes column members 31 and 33 that are erected on the concrete foundation 9 with an interval in the river width direction and the flow direction of the river R, and column members that are adjacent in the flow direction of the river R. It is configured as a unit body in which a depth member 35 constructed between 31 and 33 and a horizontal member 37 constructed between column members 31 and 33 adjacent to each other in the river width direction of the river R are combined. In the illustrated example, the slit dam main body 3 as two unit bodies is arranged at an interval in the river width direction of the river R.

  As shown in FIG. 4, the slit dam main body 3 in the present embodiment includes an upstream column member 31 and a downstream column member 33 that are arranged as a column member in order from the upstream side to the downstream side of the river R with a space therebetween. Yes. The upstream column member 31 and the downstream column member 33 are arranged so as to be separated from the upper end toward the lower end, and the lower ends thereof are embedded and fixed in the concrete foundation 9. Thereby, the upstream column member 31 is provided in a state inclined toward the upstream side of the river R from the upper end to the lower end, and the downstream column member 33 is disposed downstream of the river R from the upper end to the lower end. It is provided in an inclined state.

  As shown in FIGS. 1 and 2, the gravel body capturing member 5 includes two upstream side members that are adjacent to each other among a plurality of upstream side column members that are arranged substantially in parallel with each other in the river width direction of the river R. A horizontal rail 53 is provided between the column members 31.

  5-7 is a figure which shows the structure which attached the gravel body capture | acquisition member 5 to the slit dam main body 3, and FIG. 5 has shown the C section enlarged view of FIG. 6 shows a cross-sectional view taken along the line DD of FIG. 5, FIG. 7 (a) shows a cross-sectional view taken along the line FF of FIG. 6, and FIG. The EE sectional view taken on the line of FIG.

  As shown in FIG. 7, the side frame 51 of the gravel body capturing member 5 is composed of a curved plate obtained by bending a steel plate in the present embodiment. The curved plates as the pair of side frames 51 are arranged at an interval in the river width direction of the river R so that the inner surfaces 57 thereof face each other.

  As shown in FIG. 7, the outer surfaces of the pair of side frames 51 correspond to the shapes of the upstream outer peripheral surfaces 30 a facing each other of two adjacent upstream column members 31 among the plurality of upstream column members 31. The curved surfaces 55 are formed, and the pair of side frames 51 are provided with the curved surfaces 55 facing and in contact with the upstream outer peripheral surface 30a of the upstream column member 31 to be attached. Yes. In other words, the pair of side frames 51 are provided such that the outer surfaces thereof face each other on the upstream outer peripheral surfaces 30a of the two adjacent upstream column members 31 facing each other. The curved surface 55 has a shape having a curvature radius substantially the same as the curvature radius of the outer peripheral surface of the circular steel pipe 30 constituting the upstream column member 31. As shown in FIGS. 5 and 6, the side frame 51 formed with such a curved surface 55 is attached along the axial direction of the upstream column member 31 to be attached.

  As shown in FIGS. 5 and 6, the crosspiece 53 of the gravel body capturing member 5 is composed of another circular steel pipe having a smaller diameter than the circular steel pipe 30 in the present embodiment. The horizontal rail 53 is constructed between the pair of side frames 51 with end portions 53 a on both sides fixed to the inner surfaces 57 of the pair of side frames 51 by welding or the like. A plurality of horizontal bars 53 are installed between the pair of side frames 51 with a plurality of intervals in the axial direction of the upstream column member 31 to which the gravel body capturing member 5 is to be attached.

  As shown in FIGS. 5 to 7, an upper flange piece 61 and a lower flange piece 63 are provided on the upper end and the lower end of the inner surface 57 of the side frame 51, respectively. As shown in FIG. 5, the upper flange piece 61 and the lower flange piece 63 are made of a substantially rectangular steel plate in plan view, and the side surfaces 61 a and 63 a are fixed to the inner surface 57 of the side frame 51 by welding or the like. By doing so, it is provided so as to protrude from the upper end and the lower end of the inner surface 57 of the side frame 51.

  As shown in FIG. 5, the circular steel pipe 30 constituting the upstream column member 31 is provided with an upper bracket 71 above the upper flange piece 61 of the side frame 51, and below the lower flange piece 63 of the side frame 51. A lower bracket 73 is provided. The upper bracket 71 and the lower bracket 73 are made of a substantially rectangular steel plate in plan view, and are provided by fixing the side surfaces 71a and 73a to the outer peripheral surface of the circular steel pipe 30 by welding or the like. The steel plates constituting the upper bracket 71 and the lower bracket 73 are longer in the flow direction of the river R than the steel plates constituting the upper flange piece 61 and the lower flange piece 63 of the gravel body capturing member 5.

  As shown in FIG. 5, the side frame 51 is arranged with its lower flange piece 63 placed on the lower bracket 73 of the circular steel pipe 30, and is thereby supported by the lower bracket 73. The side frame 51 is disposed so as to face the upper flange piece 61 so that the upper surface of the side frame 51 contacts the lower surface of the upper bracket 71.

  A bolt insertion hole 65 as shown in FIG. 7B is formed in the upper flange piece 61 and the lower flange piece 63, and a bolt insertion hole 75 is formed in the upper bracket 71 and the lower bracket 73. . The bolt insertion holes 75 formed in the upper bracket 71 and the lower bracket 73 are formed as long holes extending in the flow direction of the river R.

  The gravel body capturing member 5 includes a bolt 77 passing through bolt insertion holes 65 and 75 formed in the upper flange piece 61 of the side frame 51 and the upper bracket 71 of the circular steel pipe 30, and the lower flange piece 63 of the side frame 51. Bolts 77 are inserted into bolt insertion holes 65 and 75 formed in the lower bracket 73 of the circular steel pipe 30, and nuts 79 are fastened to the bolts 77, whereby the upstream column member 31 to be attached is attached. It is fixed and provided.

  Here, since the bolt insertion holes 75 formed in the upper bracket 71 and the lower bracket 73 are long holes, there are product manufacturing errors and construction errors for each member of the gravel body capturing member 5 and the slit dam body 3. Thus, even if a positional deviation occurs between the upper bracket 71 and the lower bracket 73 and the bolt insertion holes 65 such as the upper flange piece 61 of the side frame 51, this can be absorbed. The bolt insertion hole 65 such as the upper flange piece 61 of the side frame 51 may be a long hole. Even in this case, the same function is exhibited. Further, from the viewpoint of the processing degree of the long holes, it is desirable that the extending direction of the bolt insertion holes 65 and 75 as the long holes is the flow direction of the river R.

  In the present embodiment, the width direction of the upper flange piece 61 and the lower flange piece 63 of the side frame 51 and the upper bracket 71 and the lower bracket 73 of the circular steel pipe 30 are substantially the same as the flow direction of the river R. The inclination angle with respect to the axial direction of the upstream column member 31 is adjusted in advance so as to face the direction. The width direction of the upper bracket 71 and the like here means the direction G1 in FIG.

  Next, a method for constructing the steel slit dam 1 having the above-described configuration will be described. In describing the construction method of the steel slit dam 1, the procedure necessary for attaching the gravel body capturing member 5 will be mainly described.

  First, the slit dam body 3 and the civil engineering structure 7 are constructed on the river bed of the river R. The slit dam body 3 is produced, for example, by manufacturing a circular steel pipe 30 constituting the pillar members 31 and 33, the depth member 35, and the horizontal member 37 in a factory, and transporting them to the river R as a construction site. I'm assembling. In this case, first, after placing and solidifying the first-stage concrete on the riverbed of the river R, the lower ends of the column members 31 and 33 are disposed thereon, and the depth with respect to the column members 31 and 33 is further set. The slit dam body 3 is constructed by installing the member 35 and the horizontal member 37. Thereafter, the second-stage concrete is placed from the lower end of the slit dam body 3 to a predetermined height, and the lower end of the slit dam body 3 is embedded and fixed in the concrete foundation 9. Each round steel pipe 30 is joined by welding after a flange joint provided at each end part is brought into contact with each other and bolted, or the round steel pipes 30 are arranged in contact with each other at a predetermined position.

  The civil engineering structure 7 is performed in parallel with the construction of the slit dam body 3. When the civil engineering structure 7 is a concrete structure, the concrete is placed and solidified at a predetermined position spaced in the river width direction of the river R. Built.

  After the construction of the slit dam body 3 and the civil engineering structure 7, the gravel body capturing member 5 is attached to the slit dam body 3. In this case, the side frame 51 is sandwiched between the upper bracket 71 and the lower bracket 73 with respect to the upstream column member 31 to which the upper bracket 71 and the lower bracket 73 are fixed in advance at predetermined positions. The gravel body capturing member 5 is arranged from the upstream side of the river R. Thus, by providing the upper bracket 71 and the lower bracket 73, it is possible to attach the gravel body capturing member 5 to the slit dam body 3 while performing the positioning operation easily. In addition, with respect to the adjacent upstream column member 31, it arrange | positions pressing the pair of side frames 51 of the gravel body capturing member 5, and the outer surface (curved surface 55) of the side frame 51 is the upstream column member 31. It will be fixed in a state where it is in contact with.

  The upper bracket 71 and the lower bracket 73 may be attached to the circular steel pipe 30 at the production stage in a factory, or may be directly attached by welding or the like after the construction of the slit dam body 3 at the construction site. Good.

  After the side frame 51 of the gravel body capturing member 5 is disposed at a predetermined position, the upper flange piece 61 and the lower flange piece 63 of the side frame 51, the upper bracket 71 of the circular steel pipe 30, and the bolt insertion holes 65 of the lower bracket 73. , 75 is inserted into the bolt 77, and then a nut 79 is fastened and fixed to the bolt 77. Accordingly, the gravel body capturing member 5 is fixed to the two circular steel pipes 30 that are substantially parallel to each other with an interval in the river width direction of the river R.

  Next, the effect of the steel slit dam 1 having such a configuration will be described.

  When various gravel bodies such as boulders, medium and small gravels flow down from the upstream side of the river R toward the downstream side, the various gravel bodies are captured by the circular steel pipes 30 constituting the slit dam body 3 and gravel bodies. It is captured by the crosspiece 53 of the member 5, and the fine gravel is permeated downstream as it is. In this case, the impact force applied to the horizontal beam 53 by the collision with various gravel bodies is transmitted to the slit dam body 3 via the side frame 51 at the end 53a of the horizontal beam 53, and finally from the concrete foundation 9. It will be transmitted to the surrounding ground.

  Here, the gravel body capturing member 5 in the present invention is provided with a pair of side frames 51 on the upstream outer peripheral surface 30a facing each other of a plurality of column members 31 provided in parallel with a gap in the river width direction. A horizontal rail 53 having a gravel trapping function is installed between the pair of side frames 51. For this reason, it is possible to make it the structure where the upstream of the column member 31 which is a member which has a gravel body capture function is not covered with the crosspiece 53, and the useless use of the member which has a gravel body capture function was suppressed. The structure can be obtained, and the material cost can be reduced.

  Further, the gravel body capturing member 5 in the present invention faces the outer peripheral surface 30a on the upstream side of the column member 31 as shown in FIG. 8A when various gravel bodies S1 collide with the horizontal rail 53. While the outer surfaces (curved surfaces 55) of the pair of side frames 51 are in surface contact with the upstream outer peripheral surface 30a of the column member 31, they are downstream from the upstream side of the river R along the circumferential direction W1 of the upstream outer peripheral surface 30a. It will try to slide toward the side. In this case, since a frictional force acts between the curved surface 55 of the side frame 51 and the upstream outer peripheral surface 30a of the column member 31, the impact force transmitted from various gravel bodies to the horizontal rail 53 is It is transmitted to the column member 31 while being relaxed by the frictional force. That is, at the connecting portion between the gravel body capturing member 5 and the slit dam body 3, the impact force transmitted from the gravel body to the gravel body capturing member 5 can be transmitted to the slit dam body 3 while being reduced by frictional resistance. This means that it is possible to improve the impact absorption performance and durability of the steel slit dam 1 against various gravel bodies.

  Further, in the present invention, when various gravel bodies collide with the horizontal beam 53, unless the horizontal beam 53 is greatly deformed, the horizontal beam 53 is stretched and the entire gravel body capturing member 5 is adjacent like a wedge. The pair of side frames 51 are pressed between the two column members 31 and are pressed against the upstream outer peripheral surface 30a of the column members 31 by the horizontal rails 53, so that the frictional force generated by the side frames 51 can be further exerted. It has a configuration.

  In addition, as shown in FIG. 8B, when the crosspiece 53 is greatly deformed so as to be pulled toward the downstream side of the river R due to the collision with the gravel body S2 such as a boulder, the impact force is reduced. Depending on the degree, the bolt 77 will break, but unless the length between the pair of side frames 51 of the lateral rail 53 after deformation is shorter than the distance between the two column members 31, the pair of side frames 51 The gravel trapping member 5 is not caught on the downstream side of the river R by being caught by the two column members 31. That is, by adopting the configuration as in the present invention, even when the crosspiece 53 is deformed, the gravel body capturing member 5 is difficult to be pulled out downstream. For this reason, although the gravel body capturing member 5 in the present invention is fixed to the column member 31 with a simple configuration, the gravel body capturing function can be exhibited over a long period of time. In addition, a low strength, low rigidity, and small-sized member can be used for the horizontal beam 53 on the assumption that the horizontal beam 53 is deformed, and thereby the material cost of the steel slit dam 1 can be reduced. It has become.

  Further, the gravel body capturing member 5 in the present invention includes an upper flange piece 61 and a lower flange piece 63 provided on the side frame 51, an upper bracket 71 provided on the column member 31 above or below, and a lower side. It is provided between the two column members 31 by bolting the bracket 73. For this reason, at the time of a collision with a gravel body, the pair of side frames 51 of the gravel body capturing member 5 is prevented from sliding on the upstream outer peripheral surface 30a of the column member 31, and the gravel body capturing member 5 is moved to the two columns. It can be fixed between the members 31.

  In the above-described embodiment, the pair of side frames 51 are fixed to the upper bracket 71 and the lower bracket 73 provided on the two upstream column members 31 with bolts, and the total per one gravel body capturing member 5 is fixed. Although an example of fixing at four points has been described, it is only necessary to fix at least only to the upper bracket 71 or only to the lower bracket 73 with bolts. For this reason, although the positioning property in the case of attaching the gravel body capturing member 5 to the slit dam body 3 is inferior, any of the brackets 71 and 73 that are not used for temporary fixing with bolts may be omitted. In this case, the upper flange piece 61 and the lower flange piece 63 corresponding to the brackets 71 and 73 not used for temporary fixing are omitted together, and the configuration of the slit dam body 3 and gravel body capturing member 5 is simplified. Furthermore, the work process at the time of attaching the gravel body capturing member 5 can be reduced.

  Further, in the above-described embodiment, a plurality of horizontal rails 53 are installed between the pair of side frames 51 in the axial direction of the two upstream column members 31 to which the pair of side frames 51 are to be attached. As a result, the trouble of laying a plurality of cross rails 53 one by one between the two upstream column members 31 is reduced. In this connection, such trouble is generated, but it is needless to say that only one horizontal cross 53 is provided between the pair of side frames 51.

  Further, in the present invention, it is not necessary to firmly join the side frame 51 of the gravel body capturing member 5 to the column member 31, and the gravel body capturing member 5 and the circular steel pipe 30 of the slit dam body 3 expand due to temperature change. Or, when contracting, there is a merit that it becomes difficult to be affected by temperature stress between these members. When the influence of temperature stress is small, a low-strength, low-rigidity, small-sized member can be used for the gravel body capturing member 5, thereby reducing the weight of the steel slit dam 1 as well as during construction and repair The cost can be reduced.

  Incidentally, in the case where damage occurs to the horizontal beam 53 of the steel slit dam 1 having the above-described configuration, the horizontal beam 53 is repaired by the operation described below.

  First, the gravel body capturing member 5 having the damaged cross rail 53 is removed from between the two upstream column members 31 to which the gravel body capturing member 5 is attached. In this case, the nuts of the bolts 77 penetrating through the upper flange piece 61 and the lower flange piece 63 of the side frame 51 and the upper bracket 71 and the lower bracket 73 of the circular steel pipe 30 were removed, and the bolts 77 were removed. Later, the gravel body capturing member 5 is removed from between the two upstream column members 31.

  Next, the newly prepared gravel body capturing member 5 is disposed and attached between the two upstream column members 31 after the gravel body capturing member 5 is removed. In this case, a bolt 77 is passed through the upper flange piece 61 and the lower flange piece 63 of the side frame 51 and the upper bracket 71 and the lower bracket 73 of the circular steel pipe 30, and nuts are attached to the bolts 77 to capture the gravel. The member 5 is fixed. Thereby, the repair work of the gravel body capturing member 5 is completed.

  Next, the detail of each component of the steel slit dam 1 to which this invention is applied is demonstrated.

  As an arrangement mode of the circular steel pipe 30 constituting the slit dam main body 3, a pair of side frames 51 of the gravel body capturing member 5 can be attached, and column members 31 that are substantially parallel with an interval in the river width direction of the river R, 33 may be arranged, and the number of the column members 31 and 33 arranged at intervals in the flow direction of the river R and the river width direction of the river R, the inclination angle with respect to the horizontal plane, and the like are not limited at all. . Further, the number of the depth members 35 and the horizontal members 37 and the inclination angle with respect to the horizontal plane are not limited at all. Further, the number of slit dam main bodies 3 arranged as a unit body composed of the column members 31 and 33, the depth member 35, and the horizontal member 37 described in the above embodiment is three, even if it is single. A plurality of the above may be used.

  9 and 10 are views showing the configuration of the slit dam body 4 having a different arrangement of the circular steel pipes 30 from the embodiment described above, and FIG. 9 is a partial cross-sectional front view of the slit dam body 4. FIG. 10 shows a cross-sectional view taken along the line GG of FIG.

  The slit dam body 4 has column members 31, 32 and 33 erected on the concrete foundation 9 with an interval in the river width direction and the flow direction of the river R, and an interval in the river width direction of the river R. The upper column member 34 arranged over the upper ends of these column members 31, 32, 33 and the column member 33 adjacent in the river width direction of the river R and the horizontal member 37 laid between the upper column members 34 are combined. It consists of a unit body. The column members 31, 32, and 33 are each configured such that the column member disposed on the downstream side of the river R is configured higher, whereby the upper column member 34 is provided in an inclined state with respect to the horizontal plane, The upstream end is provided at a lower position than the downstream end.

  FIG. 11 is a partially longitudinal side view showing a state in which the gravel body capturing member 5 is attached to the slit dam body 4 having such a configuration.

  In the present embodiment, the width direction of the upper flange piece 61 and the lower flange piece 63 of the side frame 51 and the upper bracket 71 and the lower bracket 73 of the circular steel pipe 30 are in the axial direction of the upper column member 34. The inclination angle of the upper column member 34 with respect to the axial direction is adjusted in advance so as to face substantially the same direction as the orthogonal direction. The width direction of the upper bracket 71 or the like here means the direction G2 in FIG.

  In addition, the inclination angle with respect to the axial direction of the column member 31 and the upper column member 34 such as the upper bracket 71 is adjusted according to the inclination angle and position of the column member 31 and the upper column member 34 with respect to the vertical direction. When the direction of transmission of the collision load from the gravel bodies colliding with these is different and the inclination angle of the upper column member 34 with respect to the vertical direction is relatively large as shown in FIG. This is because the friction resistance function by the side frame 51 of the gravel body capturing member 5 can be efficiently exhibited when the angle is adjusted to a proper inclination angle.

  The civil engineering structure 7 is a so-called sleeve portion, and is a structure having excellent rigidity that is erected on the foundation ground around the river R. The civil engineering structure 7 may be formed of, for example, steel, stone, or the like other than concrete, but is not particularly limited as long as it is a known material. The size and form of the civil engineering structure 7 are arbitrary design items and are not particularly limited.

  As described in the above embodiment, the circular steel pipe 30 to which the pair of side frames 51 of the gravel body capturing member 5 is attached is between the plurality of column members 31 provided in an inclined state with respect to the horizontal plane. It may be between the column member 31 provided in a state substantially orthogonal to the horizontal plane or the depth member 35 provided in a state substantially parallel to the horizontal plane. Further, as shown in FIG. 1 and the like, the pair of side frames 51 of the gravel body capturing member 5 are attached to the circular steel pipe 30 constituting the two column members 31 and the like of the slit dam body 3 configured as one unit body. Even if it is, it may be attached ranging over the circular steel pipe 30 which comprises each pillar member 31 grade | etc., Of the slit dam main body 3 comprised as two different unit bodies. Moreover, it is preferable to attach the pair of side frames 51 of the gravel body capturing member 5 to the upstream column member 31 of the river R, thereby effectively distributing the load received upon collision with various gravel bodies to the concrete foundation 9. Can be made.

  FIG. 12 is a diagram schematically showing a relationship between the curved surface 55 of the side frame 51 of the gravel body capturing member 5 and the outer peripheral surface of the two circular steel pipes 30 to which the gravel body capturing member 5 is to be attached. It is the figure which abbreviate | omitted the upper bracket 71, the upper side flange piece 61, etc. from (a).

  As shown in FIG. 12A, the curved surface 55 of the side frame 51 of the gravel body capturing member 5 has a curvature radius substantially the same as the curvature radius of the upstream outer peripheral surface 30a of the circular steel pipe 30 constituting the column member 31 and the like. However, the present invention is not limited to this, and as shown in FIG. 12 (b), it is formed from a curvature larger than the curvature of the upstream outer peripheral surface 30a of the circular steel pipe 30. Also good. This means that an interval may be provided between the curved surface 55 of the side frame 51 and the upstream outer peripheral surface 30 a of the circular steel pipe 30.

  Further, the side frame 51 of the gravel body capturing member 5 does not need to be configured by a curved plate in which the curved surface 55 is formed, and is opposed to the upstream outer peripheral surface 30a of the two adjacent column members 31 facing each other. The outer surface may be provided so as to face each other. For example, as shown in FIG. 12C, the outer surface may be made of a flat steel plate. In this case, the outer surface 56 of the side frame 52 made of a flat steel plate is provided in a state of being in contact with the upstream outer peripheral surface 30 a of the column member 31. When such a configuration is adopted, it is not necessary to bend the side frame 51 of the gravel body capturing member 5, so that the manufacturing cost of the gravel body capturing member 5 can be reduced.

  In addition, when the side frame 51 of the gravel body capturing member 5 is configured by a curved plate in which the curved surface 55 is formed, the side frame 51 of the side frame 51 is opposed to the upstream outer peripheral surface 30a of the two adjacent column members 31. The outer surface (curved surface 55) comes into contact over a wide range, and a large frictional resistance can be exhibited as compared with the case where the outer surface (curved surface 55) is made of a flat steel plate.

  Moreover, the upstream outer peripheral surface 30a facing each other of the two circular steel pipes 30 here refers to the outer peripheral surface of the circular steel pipe 30 corresponding to the range R1 shown in FIG.

  Although the example which curved the steel plate demonstrated the side frame 51 of the gravel body capture | acquisition member 5 as a method of obtaining this in the above-mentioned embodiment example, it does not limit to this, For example, a circular steel pipe is the axial direction. You may obtain by cutting along.

  The crosspiece 53 of the gravel body capturing member 5 is made of a steel pipe having a circular cross section, and the crosspiece 53 itself is deformed at the time of collision with the gravel body, so that the impact at the time of impact can be easily absorbed. The crosspiece 53 may be composed of a steel pipe having a square cross section, and in this case as well, it becomes easy to absorb the impact at the time of collision with the gravel. In addition, although the function which absorbs the impact at the time of such an impact easily is not exhibited, the crosspiece 53 may be comprised by rod-shaped and plate-shaped members, such as shape steel of various cross-sectional shapes. . The number of the horizontal rails 53 constructed between the pair of side frames 51 is not particularly limited. Moreover, when the crosspiece 53 is comprised from a steel pipe with a circular cross section, the thickness and diameter are, for example, about 1/2 to 3/4 with respect to the diameter and thickness of the round steel pipe 30 constituting the slit dam body 3. It is preferable to comprise.

  The upper flange piece 61, the lower flange piece 63 and the upper bracket 71 and the lower bracket 73 provided on the circular steel pipe 30 are examples in which plate-like members such as steel plates are used in the above-described embodiment. Although described, the shape is not particularly limited.

It is a partial cross section front view of the steel slit dam to which the present invention is applied. It is the sectional view on the AA line of FIG. It is a partial cross-sectional front view which shows the structure of a slit dam main body. It is the BB sectional view taken on the line of FIG. It is the C section enlarged view of FIG. It is the DD sectional view taken on the line of FIG. (A) is the EE sectional view taken on the line of FIG. 6, (b) is the FF sectional view taken on the line of FIG. It is a model figure for demonstrating the effect of this invention. It is a partial cross-sectional front view which shows the other structure of a slit dam main body. It is the GG sectional view taken on the line of FIG. It is a partially longitudinal side view which shows the state which attached the gravel body capture member with respect to the slit dam main body which consists of another structure. It is a schematic plane sectional view for demonstrating other embodiment of this invention. It is a partial cross-sectional front view for demonstrating a prior art. It is a partially vertical side view for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel slit dam 3 Slit dam main body 5 Gravel body capture member 7 Civil structure 9 Concrete foundation 30 Circular steel pipe 30a Upstream outer peripheral surface 31 Upstream column member 33 Downstream column member 35 Depth member 37 Horizontal member 51 Side frame 52 Side Frame 53 Horizontal beam 55 Curved surface 56 Outer surface 57 Inner surface 61 Upper flange piece 61a Side surface 63 Lower flange piece 63a Side surface 65 Bolt insertion hole 71 Upper bracket 71a Side surface 73 Lower bracket 73a Side surface 75 Bolt insertion hole 77 Bolt 79 Nut

Claims (7)

In the steel slit dam arranged between civil engineering structures formed at intervals in the river width direction of the river,
A plurality of column members made of circular steel pipes provided substantially in parallel with an interval in the river width direction;
Among the plurality of column members, a pair of side frames provided with their outer surfaces facing each other on the upstream outer peripheral surface of two adjacent column members facing each other, and a horizontal rail installed between the pair of side frames A steel slit dam, comprising: a gravel body capturing member. 2. The steel slit dam according to claim 1, wherein outer surfaces of the pair of side frames are formed of curved surfaces having shapes corresponding to upstream outer peripheral surfaces of the two column members. The pair of side frames can slide on the outer surface of the side frames with respect to the upstream outer peripheral surfaces of the two pillar members when the gravel body flowing down from the upstream side of the river collides with the horizontal rail. The steel slit dam according to claim 1 or 2, wherein the steel slit dam is provided in a state. The pair of side frames has a bolt inserted into an insertion hole formed in a flange piece provided at a lower end or an upper end of the pair of side frames and a bracket provided in the pillar member below or above the flange piece. The steel slit dam according to any one of claims 1 to 3, wherein the steel slit dam is provided on an upstream outer peripheral surface of the two column members. The steel slit dam according to any one of claims 1 to 4, wherein the gravel body capturing member has a plurality of horizontal rails installed between the pair of side frames. A repair method of a steel slit dam for repairing a damaged gravel body capturing member of the steel slit dam according to claim 1,
Remove the damaged gravel body capture member from between the two pillar members,
A method of repairing a steel slit dam, characterized in that a newly prepared gravel body capturing member is disposed between the two column members. A gravel trapping member used for the steel slit dam according to claim 1, comprising the pair of side frames and the cross rail.

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