Structure of a horizontal beam type permeable sabo dam

Abstract

To provide a horizontal beam type permeable sabo dam capable of safely and efficiently attaching and detaching a horizontal beam. [Solution] The system comprises a transparent capture body 10 installed on a concrete support base 60, the transparent capture body 10 comprising a filter unit 20 with a transparent structure in which multiple cross beams 40 are installed in parallel at a position spaced from the support base 60, a three-dimensional support column body 30 supporting the filter unit 20, and a cross beam positioning device 50 capable of individually fixing both ends of the multiple cross beams 40, the cross beam 40 positioning device 50 comprising a band-shaped fixed receiving plate 51 with multiple accommodating grooves formed therein capable of accommodating the cross beams 40, multiple restraining pieces 52 capable of restraining the cross beams, and detachable connecting elements connecting the fixed receiving plate 51 and the restraining pieces 52, and the restraining pieces 52 can be individually attached and detached to allow each cross beam 40 to be individually attached and detached.

Description

[Technical field]

[0001] The present invention relates to a permeable sabo dam equipped with a plurality of cross beams, and more particularly to a permeable sabo dam with cross beams having an improved mounting structure for the cross beams. [Background technology]

[0002] Patent documents 1 and 2 disclose a horizontal beam-type permeable sabo dam equipped with multiple horizontal beams, and patent document 3 discloses a slit-type sabo dam with a long opening (slit) in the center of a concrete dam body. In designing facilities, the appropriate type of permeable sabo dam is selected from these sabo dams, taking into consideration the characteristics of the target sediment runoff, etc.

[0003] The applicant has previously filed an application for an erosion-control dam facility that combines a horizontal beam-type permeable erosion-control dam to be installed as the main levee on the riverbed in the sweeping section of a river, and a slit-type permeable erosion-control dam to be installed as a secondary levee downstream of the horizontal beam-type permeable erosion-control dam. The main levee, a horizontal beam type permeable sabo dam, is equipped with multiple horizontal beams arranged in parallel and a support frame that supports the multiple horizontal beams. This erosion-control dam facility has the horizontal capture surface of the main dam and the dam section of the secondary dam set at approximately the same height so that the two dams function synergistically.The structure allows sediment to accumulate naturally just upstream of the main dam, while preventing the accumulated sediment from suddenly flowing downstream. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-328658 A [Patent Document 2] JP 2009-243196 A [Patent Document 3] JP 2003-138544 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional horizontal beam type permeable sabo dams have the following inherent problems to be solved: <1> Generally, cross beams are made of steel pipes with excellent bending rigidity (for example, 500 mm in diameter and 10 m in total length) or mortar-filled steel pipes, and each cross beam can weigh up to several tons. As a result, the installation work of the heavy cross beams had to be carried out carefully, which reduced work efficiency and required a lot of time and effort to assemble the cross beams on site. <2> When erecting cross beams in multiple stages on the inclined portion of the support frame, if one cross beam accidentally slips off during work, there is a risk that other temporarily placed cross beams will slide off in a chain reaction. If the heavy cross beam slides off, it could lead to a serious accident, so proposals for improvement technologies are needed. <3> In horizontal beam-type permeable sabo dams, some of the horizontal beams may corrode due to deterioration over time after installation. Previously, with horizontal beam-type permeable sabo dams, it was not possible to individually remove and replace horizontal beams that had deteriorated over time, and so replacing the cross beams required a lot of time and effort.

[0006] The present invention has been made in consideration of the above points, and an object of the present invention is to propose the following horizontal beam type permeable sabo dam. <1> To enable safe and efficient installation of a cross beam. <2> To easily perform partial replacement of cross beams. [Means for solving the problem]

[0007] The present invention relates to a horizontal beam type permeable sabo dam, which comprises a permeable trapping body installed on a concrete support base, the permeable trapping body comprising a filter unit having a permeable structure in which a plurality of horizontal beams are installed in parallel in the river width direction at a position separated from the support base, a support column body having a three-dimensional structure formed by combining a plurality of members so as to support the filter unit, which is erected on the support base, and a positioning device for the horizontal beams capable of individually fixing both ends of the plurality of horizontal beams, the positioning device for the horizontal beams comprising: Part of the periphery Accommodates multiple Upward A belt-shaped fixed receiving plate having a receiving groove formed therein, and the horizontal beam Part of the periphery Capable of containing and restraining Downward The fixing plate has a receiving groove, and includes a plurality of restraining pieces capable of individually closing openings of the receiving groove of the fixed receiving plate, and a detachable connecting element connecting the fixed receiving plate and the restraining pieces, The upward receiving groove of the fixed receiving plate and the downward receiving groove of the restraining piece are capable of contacting and gripping the entire circumferential surface of the end of the cross beam, The restraining pieces are individually detachable, so that each of the horizontal beams can be individually detachable. In another form of the present invention, connecting elements are inserted into communicating holes provided on both sides of the accommodating groove of the fixed support plate and communicating holes provided on both sides of the accommodating groove of the restraint piece, and both ends of the cross beam are gripped and fixed by adjacent positioning devices. In another embodiment of the present invention, the filter unit has an inclined trapping surface formed by arranging horizontal beams obliquely, and a horizontal trapping surface formed horizontally from the bottom of the inclined trapping surface toward the upstream side. In another form of the present invention, an inclined capture surface is formed by arranging a plurality of cross beams in parallel between fixed receiving plates integrally formed on a portion of the inclined pillar that constitutes the support column body, and a horizontal capture surface is formed by arranging a plurality of cross beams in parallel between separate fixed receiving plates provided on the top surface of a concrete rising portion that is raised from the support base. In another embodiment of the present invention, the fixed receiving plate and the restraining piece constituting the cross beam positioning device are made of steel plate. In another embodiment of the invention, the connecting element is a connecting bolt or a connecting pin. In another embodiment of the present invention, the support column body comprises an inclined column erected at an angle toward the downstream side of the river with respect to the support base, and one or more supporting columns erected at an angle with respect to the support base so as to support the inclined column. In another embodiment of the invention, the cross beam is made of concrete filled steel tube. Effect of the Invention

[0008] The present invention has at least one of the following advantages. <1> When installing multiple cross beams, a positioning device is used that allows the cross beams to be assembled or removed one by one, so that the cross beams can be installed safely and efficiently even if the installation surface of the cross beams has a slope. <2> Since the cross beams can be assembled one by one, there is no need to worry about other cross beams that have already been assembled slipping off during the assembly work of a cross beam. <3> Even if the transverse beam is several tons heavy, the filter unit that constitutes the transmission capture body can be assembled safely. <4> By a simple operation of removing specific restraining pieces, the cross beams can be replaced one by one. It is not necessary to remove all of the restraining pieces in order to replace a particular cross beam. <5> Since the fixed receiving plate and the restraining piece that constitute the cross beam positioning device are made of steel plate, the positioning device can be manufactured at low cost and the fixed receiving plate can be easily installed. [Brief description of the drawings]

[0009] [Figure 1] A front view of the horizontal beam type open-type erosion control dam (open-type erosion control dam) according to the present invention, seen from the upstream side [Diagram 2] A perspective view of a permeable trapping body that constitutes a permeable sabo dam [Diagram 3] Cross section of a cross beam [Figure 4] Side view of the transmission capture body during assembly [Diagram 5]Illustration of the construction method for a permeable sabo dam [Figure 6] Illustration of how to assemble the transmission capture body DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present invention will now be described in detail with reference to the drawings.

[0011] <1> Overview of horizontal beam type permeable sabo dam Description will be given with reference to Figures 1 to 4. The horizontal beam type permeable sabo dam according to the present invention (hereinafter referred to as "permeable sabo dam") comprises a permeable capture body 10 installed on a supporting foundation 60 on the riverbed. The following explains permeable sabo dams in detail.

[0012] <2> supporting foundation A concrete support foundation 60 is constructed on the riverbed. A pair of side walls 61 made of concrete are erected integrally on both the left and right sides of the support foundation 60 in the river width direction. A water passage opening 62 is formed between the left and right side walls 61. The water passage opening 62 is an open space in which the permeable capture body 10 can be placed.

[0013] <3> transmission trap The permeable trapping body 10 is a permeable frame structure formed by combining a plurality of rigid members such as steel materials, and has the function of trapping drifting objects such as gravel. The transparent capture body 10 in this example comprises a filter unit 20 of a transparent structure composed of an assembly of multiple cross beams 40, a support column body 30 that supports the filter unit 20 from its back side (downstream side), and a positioning device 50 for individually fixing both ends of the multiple cross beams 40.

[0014] <3.1> Horizontal beam The cross beam 40 is a highly rigid rod-like object having a circular or rectangular cross-sectional shape, and is configured to capture debris such as soil and sand flowing downstream in the river.

[0015] FIG. 3 shows an example of a cross beam 40 made of concrete-filled steel tubes. This cross beam 40 has an outer pipe 41 made of steel pipe, a plurality of reinforcing bars 42 arranged longitudinally inside the outer pipe 41, a plurality of inner pipes 43 made of steel pipe arranged at equal intervals inside the reinforcing bars 42, and a solidifying material 44 such as mortar filled inside the outer pipe 41. The diameter and overall length of the horizontal beam 40 can be selected as appropriate, but in practice the diameter of the horizontal beam 40 is about 0.5 m and the overall length is about 10 m.

[0016] Each of the inner pipes 43 may be used as a hollow pipe without filling the inside with a binder, or may be used by filling the inside with a binder. Furthermore, the cross beam 40 is not limited to being made of filled steel pipes, and any known rigid structure can be used.

[0017] <3.2> Filter unit The filter unit 20 is a filter material made of a cross beam 40 placed within a water passage opening 62 . The filter unit 20 has an inclined capture surface 21 formed by arranging a plurality of cross beams 40 diagonally along the inclined columns 31 of the support column body 30 at a position spaced apart from the support base 60, and a horizontal capture surface 22 formed horizontally from the bottom of the inclined capture surface 21 toward the upstream side at a position spaced a predetermined distance in the vertical direction from the support base 60. A horizontally long slit 23 is formed between the multiple horizontal beams 40 (FIG. 2). The width of the slit 23 is appropriately selected depending on the type of the flowing matter to be captured.

[0018] In this example, a form is described in which multiple cross beams 40 that constitute the horizontal capture surface 22 are supported on the top surface of a rising portion 63 that is raised from the support base 60, but the horizontal capture surface 22 may also be formed by supporting multiple cross beams 40 on a steel material that extends horizontally upstream from the middle of the inclined column 31 that constitutes the support column body 30.

[0019] <3.3> Support column The support pillar 30 is a three-dimensional structure formed by combining a plurality of rigid members such as steel members so as to be able to support the filter unit 20 . The support column body 30 of this example comprises an inclined column 31 erected at an angle relative to the support base 60 , and one or more supporting columns 32 erected at an angle relative to the support base 60 so as to support the inclined column 31 . The inclined pillar 31 is inclined toward the downstream side of the river, and the multiple supporting pillars 32 are inclined toward the upstream side of the river. The inclination angle (gradient) of the inclined pillar 31 can be appropriately selected according to the angle at which the inclined capture surface 21 is formed.

[0020] The inclined column 31 and the multiple supporting columns 32 are rigid members having excellent compressive strength and bending strength, and may be made of, for example, a known mortar-filled steel pipe.

[0021] The inclined pillar 31 and the supporting pillar 32 are not limited to a single pillar body, but may be composed of a plurality of divided pillar bodies connected together by bolts or the like.

[0022] <3.4> Horizontal beam positioning device In the present invention, a positioning device 50 is used to immobilize both ends of the multiple cross beams 40 . That is, the positioning device 50 is capable of positioning both ends of the cross beam 40 that is installed between adjacent inclined columns 31 and between the top end faces of adjacent rising portions 63 .

[0023] Referring to Figure 4.6, the positioning device 50 comprises at least a band-shaped fixed receiving plate 51 having a plurality of accommodating grooves 51a arranged along the longitudinal direction, a plurality of restraining pieces 52 capable of individually closing the openings of the accommodating grooves 51a, and a detachable connecting element 53 connecting between the fixed receiving plate 51 and the restraining pieces 52. The fixed receiving plate 51 and the restraining piece 52 are preferably made of steel plate.

[0024] <3.4.1> Fixed receiving plate The band-shaped fixed receiving plate 51 has a plurality of receiving grooves 51a formed along its longitudinal direction. The accommodation groove 51a is formed as a semicircular upward opening so that the cross beam 40 can be dropped in from above and accommodated therein. The fixed receiving plate 51 has one or more connection holes 51b formed in the extending portions between the receiving grooves 51a.

[0025] <3.4.2> Restraint piece The restraining piece 52 is a removable pressing member that cooperates with the fixed receiving plate 51 to restrain and position the cross beam 40. The restraining piece 52 has a downwardly facing semicircular receiving groove 52a, and a pair of connecting holes 52b are formed in the extending portions on both sides of the receiving groove 52a. The receiving groove 52a is also formed as a semicircular opening capable of receiving the cross beam 40 therein. In this example, the constraint piece 52 is described as having a C-shape overall, but the constraint piece 52 may also be U-shaped.

[0026] In the present invention, the cross beams 40 are individually positioned using the restraining pieces 52. The present invention uses the restraining pieces 52 in order to perform the installation work of the cross beams 40 safely and to facilitate the individual replacement of the cross beams 40.

[0027] <3.4.3> Linking elements The connecting element 53 is a detachable connecting member for connecting the multiple restraining pieces 52 to the fixed support plate 51 . The connecting element 53 may be a connecting bolt, which is a combination of a bolt and a nut, but the connecting element 53 may also be a connecting pin.

[0028] <3.4.4> Mounting position of fixed support plate of positioning device The mounting position of the fixed receiving plate 51 of the positioning device 50 will be described with reference to FIG. The fixed receiving plate 51 of the positioning device 50 is attached to a part of the inclined column 31 and the top end surface of a rising portion 63 formed by protruding from the support base 60.

[0029] To attach the fixed support plate 51 to the inclined pillar 31, the fixed support plate 51 is placed along the outer peripheral surface of the upstream side of the inclined pillar 31 with the accommodating groove 51a facing upward, and the bottom surface of the fixed support plate 51 is welded to the inclined pillar 31. The fixed support plate 51 may be fixed to the inclined column 31 in advance, or may be attached later by welding on site.

[0030] To attach the fixed receiving plate 51 to the rising portion 63, the base plate 54 provided on the bottom surface of the fixed receiving plate 51 is placed on the top surface of the rising portion 63 and fixed in place using anchor bolts or the like.

[0031] <4> Horizontal beam stopper The cross beam 40 is fixed by the positioning device 50, but when the cross beam 40 moves blindly in the extension direction (river width direction), stoppers may be provided near both ends of the cross beam 40 and abutted against the positioning device 50 to restrict the blind movement of the cross beam 40 in the sliding direction.

[0032] [How to construct a permeable sabo dam] Next, a method for constructing a permeable sabo dam will be explained.

[0033] <1> Concrete pouring worker Explaining with reference to Figures 4 and 5, concrete is poured into the riverbed to construct a support base 60, and a pair of side walls 61 are constructed on both the left and right sides of the support base 60 in the river width direction.

[0034] <2> Installation of support columns When constructing the support foundation 60, the diagonal pillars 31 and the supporting pillars 32 which constitute the support column are erected on the support foundation 60. That is, the lower ends of the inclined pillars 31 and supporting pillars 32 that have been brought to the site are buried in the support foundation 60, and a concrete rising portion 63 is constructed to cover the lower portions of the inclined pillars 31 and supporting pillars 32. The rising portion 63 is formed narrow along the flow direction of the river in accordance with the erection positions of the inclined pillars 31 and the supporting pillars 32. In addition to functioning as a support for the cross beam 40, the concrete rising portion 63 also functions as a protective member for the inclined columns 31 and the supporting columns 32.

[0035] The height of the rising portion 63 can be appropriately selected. Although not shown in the figure, in a configuration in which a slit-type permeable erosion control dam (secondary dam) is deployed downstream of a horizontal beam-type permeable erosion control dam (main dam), the horizontal capture surface 22 of the horizontal beam-type permeable erosion control dam and the dam portion of the slit-type permeable erosion control dam are set at approximately the same height.

[0036] <3> Cross beam construction A method of assembling the filter unit 20 using a plurality of cross beams 40 on the upstream side of the support column 30 will be described with reference to FIGS.

[0037] <3.1> Assembly of the horizontal capture surface A band-shaped fixed receiving plate 51 is horizontally installed on the top end surface of each of the adjacent rising portions 63 . A horizontal beam 40 is arranged in the width direction of the river between adjacent fixed receiving plates 51 in the river width direction, and both ends of the horizontal beam 40 are dropped into each of the receiving grooves 51a of the adjacent fixed receiving plates 51. After the restraining pieces 52 are installed so as to sandwich both ends of the cross beam 40, the restraining pieces 52 and the fixed receiving plate 51 are connected by connecting elements 53, and the cross beams 40 are fixed one by one. The horizontal capture surface 22 is assembled by suspending a plurality of lateral beams 40 along a horizontally positioned fixed support plate 51.

[0038] <3.2> Assembly of the inclined capture surface A belt-shaped fixed support plate 51 is previously installed on each of the adjacent inclined columns 31. The horizontal beam 40 is disposed between adjacent fixed receiving plates 51, 51 in the river width direction, and both ends of the horizontal beam 40 are dropped into each accommodation groove 51a. The restraining pieces 52 are disposed so as to sandwich the ends of the cross beams 40 , and the restraining pieces 52 and the fixed support plate 51 are connected by connecting elements 53 . The inclined capture surface 21 is assembled by bridging a plurality of cross beams 40 between the inclined fixed receiving plates 51, 51 in stages from the lower stage side to the upper stage side.

[0039] An example of a method for assembling the inclined capture surface 21 will now be described with reference to FIG. The cross beams 40 are successively laid horizontally from the lower stage side of the fixed receiving plate 51 to the upper stage. 6(A) and (B) show a state in which the cross beam 40 is accommodated in the lower accommodation groove 51a and then covered with the restraint piece 52 to be clamped. The restraining piece 52 may be connected to the fixed receiving plate 51 at both ends at the same time, but as shown in Figure 6 (A), one end of the restraining piece 52 may be pivotally supported in advance on the fixed receiving plate 51 via a connecting element 32, and the restraining piece 52 may be rotated immediately after being accommodated in the accommodation groove 51a so that the restraining piece 52 is fitted over the cross beam 40, thereby fixing the cross beam 40 in a short period of time.

[0040] After the fixing of the cross beam 40 in the lower receiving groove 51a is completed, another cross beam 40 is similarly received and fixed in the upper receiving groove 51a as well, as shown in FIG. 6(C).

[0041] When multiple cross beams 40 are installed on the inclined fixed support plate 51, the cross beams 40 are installed stepwise from the lower stage side of the fixed support plate 51 to the upper stage, and the cross beams 40 are installed one by one, so that the cross beams 40 can be installed safely and easily without slipping off. Even if the horizontal beam 40 accidentally slides down during the assembly work of the inclined capture surface 21, other horizontal beams 40 that have already been assembled will not slide down in a chain reaction.

[0042] <4> Sediment capture by permeable trapping material Various types of debris flow downstream in rivers, including relatively fine, small and medium-sized gravel, such as mud, soil, sand, driftwood, and fallen rocks. When these waste materials flow from the upstream side to the downstream side of the permeable sabo dam, they pass through the water passage opening 62 of the permeable sabo dam. At this time, on the upstream side of the permeable trapping body 10, drift material such as sand and sand accumulates, and the amount of accumulation gradually increases. When the water level of the flowing material rises, the flowing material such as soil and sand is captured by the lateral beam 40 of the horizontal capture surface 22 that constitutes the filter unit 20 of the permeable capture body 10, and the flowing material such as soil and sand is further captured by the multiple lateral beams 40 that constitute the inclined capture surface 21.

[0043] When capturing drifting debris such as soil and sand, an impact is applied to the cross beam 40, but the impact force is supported by the rigidity of the cross beam 40 and the support column body 30. Finally, the impact force is supported by the riverbed via the supporting foundation 60 .

[0044] [How to partially replace the side beam] Next, a method for partially replacing the cross beam 40 of the permeable trap 10 installed in a permeable sabo dam will be described. That is, when the cross beam 40 is to be partially replaced, the restraining pieces 52 at both ends of the cross beam 40 to be replaced are removed, and then the specific cross beam 40 is pulled out. Then, after replacing the cross beam 40 with a new one, the restraining piece 52 is reattached, and the replacement work of the cross beam 40 is completed. In particular, since the cross beams 40 can be replaced one by one, there is no need to remove the restraining pieces 52 of the other undamaged cross beams 40. In this way, if the steel cross beam 40 becomes corroded or damaged, the cross beam 40 can be easily replaced in a short time by simply attaching and detaching the specific restraining piece 52. [Explanation of symbols]

[0045] 10...Transmission trap 20. Filter unit 21... Inclined capture surface 22...Horizontal acquisition surface 23...Slit 30...Supporting column body 31... Oblique pillar 32...Abutment pillar 40... Horizontal beam 41... Outer tube 42 Reinforcement 43...Inner tube 44... Consolidation material 50 Positioning device 51...Fixed receiving plate 51a: Fixed support plate accommodation groove 51b...Connection hole 52...Restriction piece 52a: Constraint piece accommodation groove 52b...Connection hole 53 Connecting element 54... Circuit Board 60...Supporting foundation 61...Side wall 62 Water passage opening 63....Rising section

Claims

1. A horizontal beam type permeable sabo dam comprising a permeable trapping body installed on a concrete support base, the permeable trapping body comprising a filter unit having a permeable structure in which a number of horizontal beams are installed in parallel in the river width direction at a position spaced apart from the support base, a support column body having a three-dimensional structure formed by combining a number of members and erected on the support base to support the filter unit, and a horizontal beam positioning device capable of individually fixing both ends of the multiple horizontal beams, The positioning device for the cross beam includes a belt-shaped fixed receiving plate having a plurality of upwardly facing receiving grooves that can receive a part of the circumferential surface of the cross beam; a plurality of restraining pieces each having a downward receiving groove capable of receiving and restraining a portion of a peripheral surface of the cross beam, the restraining pieces being capable of individually closing an opening of the receiving groove of the fixed receiving plate; a detachable connecting element connecting the fixed support plate and the restraining piece; The upward receiving groove of the fixed receiving plate and the downward receiving groove of the restraining piece are capable of contacting and gripping the entire circumferential surface of the end of the cross beam, The restraining pieces are individually detachable to allow each of the horizontal beams to be individually detachable. Horizontal beam type permeable erosion control dam.

2. 2. A horizontal beam type permeable sabo dam as described in claim 1, characterized in that connecting elements are inserted into communicating holes provided on both sides of the accommodating groove of the fixed support plate and communicating holes provided on both sides of the accommodating groove of the restraint piece, thereby holding both ends of the horizontal beam by the adjacent positioning devices.

3. 3. A horizontal beam-type permeable sabo dam as described in claim 1 or 2, characterized in that the filter unit has an inclined capture surface formed by arranging horizontal beams diagonally, and a horizontal capture surface formed horizontally from the bottom of the inclined capture surface toward the upstream side.

4. 4. A horizontal beam type permeable sabo dam as claimed in claim 3, characterized in that an inclined capture surface is formed by arranging a plurality of horizontal beams in parallel between fixed receiving plates which are integrally formed with a part of the inclined pillars constituting the support column body, and a horizontal capture surface is formed by arranging a plurality of horizontal beams in parallel between separate fixed receiving plates which are provided on the top surface of a concrete rising portion which is raised from the support foundation.

5. 2. A horizontal beam type permeable sabo dam according to claim 1, wherein the fixed receiving plate and the restraining piece constituting the horizontal beam positioning device are made of steel plate.

6. 2. The horizontal beam type permeable sabo dam according to claim 1, wherein the connecting element is a connecting bolt or a connecting pin.

7. 2. The horizontal beam-type permeable sabo dam according to claim 1, characterized in that the support column body comprises an inclined column erected at an angle toward the downstream side of the river with respect to a support base, and one or more supporting columns erected at an angle with respect to the support base so as to support the inclined column.

8. 2. The horizontal beam type permeable sabo dam according to claim 1, wherein the horizontal beam is made of a concrete-filled steel pipe.

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