Structure of a transverse beam type sediment control dam

Abstract

To provide a transverse-beam type sediment control dam that allows for safe and efficient attachment and detachment of transverse beams. [Solution] The system comprises a permeable trapping body 10 installed on a concrete support foundation 60, the permeable trapping body 10 comprising a permeable filter unit 20 having multiple horizontal beams 40 erected in parallel at a position spaced apart from the support foundation 60, a three-dimensional support column 30 supporting the filter unit 20, and a horizontal beam positioning device 50 capable of individually fixing both ends of the multiple horizontal beams 40, the horizontal beam positioning device 50 comprising a strip-shaped fixing receiving plate 51 having multiple accommodating grooves capable of accommodating the horizontal beams 40, multiple restraining pieces 52 capable of restraining the horizontal beams, and a detachable connecting element connecting the fixing receiving plate 51 and the restraining pieces 52, and the horizontal beams 40 can be individually attached and detached by individually attaching and detaching the restraining pieces 52.

Description

Technical Field

[0001] The present invention relates to a permeable sand prevention dike having a plurality of horizontal beams, and particularly to a horizontal beam type permeable sand prevention dike with an improved mounting structure of the horizontal beams.

Background Art

[0002] Patent Documents 1 and 2 disclose a horizontal beam type permeable sand prevention dike having a plurality of horizontal beams, and Patent Document 3 discloses a slit type sand prevention dike provided with a vertically long opening (slit) in the central portion of a concrete dike body. In facility design, an appropriate type of permeable sand prevention dike is selected from these sand prevention dikes in consideration of the target sediment outflow characteristics and the like.

[0003] The applicant has previously filed an application for a sand prevention dike facility that combines a horizontal beam type permeable sand prevention dike installed as a main dike on the riverbed in the scouring section of a river, and a slit type permeable sand prevention dike installed as a secondary dike on the downstream side of the horizontal beam type permeable sand prevention dike. The horizontal beam type permeable sand prevention dike as the main dike includes a plurality of horizontal beams arranged in parallel and a support frame body that supports the plurality of horizontal beams. This sand prevention dike facility sets the horizontal capture surface of the main dike and the weir portion of the secondary dike at substantially the same height so that the main dike and the secondary dike function synergistically, and sediment is naturally deposited in front of the upstream side of the main dike while suppressing the sudden flow of the deposited sediment toward the downstream side.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0005] Conventional horizontal beam type permeable sediment control dams have the following inherent problems that need to be addressed. <1> Generally, horizontal beams are made of steel pipes with excellent bending rigidity (for example, 500 mm in diameter and 10 m in length) or mortar-filled steel pipes, and each horizontal beam is a heavy object weighing several tons. Therefore, the installation of the heavy horizontal beams required careful work, resulting in poor work efficiency and requiring a lot of time and effort for on-site assembly of the horizontal beams. <2> When installing horizontal beams in multiple stages on the inclined section of a support frame, if one horizontal beam accidentally slides down during the work, there is a risk that the temporarily placed horizontal beams will slide down in a chain reaction. Since the sliding of heavy horizontal beams can lead to major accidents, there is a need for proposals for improvement technologies. <3> In horizontal-beam type permeable sediment control dams, some of the horizontal beams may corrode due to aging and deterioration after installation. Conventional horizontal-beam type permeable sediment control dams have required a great deal of time and effort to replace the horizontal beams because it is not possible to individually remove and replace the horizontal beams that have deteriorated over time.

[0006] This invention has been made in view of the above points, and its purpose is to propose the following transverse beam type permeable sediment control dam. <1> The horizontal beams must be able to be installed safely and efficiently. <2> The ability to easily replace parts of the horizontal beam. [Means for solving the problem]

[0007] The present invention relates to a transmissive sediment control dam of the transmissive type, comprising a transmissive trapping body installed on a concrete support foundation, the transmissive trapping body comprising a filter unit with a transmissive structure in which a plurality of transverse beams are erected in parallel in the direction of the river width at a position away from the support foundation, a support column body with a three-dimensional structure formed by combining a plurality of members (steel materials) to stand upright on the support foundation and support the filter unit, and a transverse beam positioning device capable of individually fixing both ends of the plurality of transverse beams, wherein the transverse beam positioning device comprises a strip-shaped fixing receiving plate having a plurality of receiving grooves capable of accommodating transverse beams, a plurality of restraining pieces having receiving grooves capable of accommodating and restraining the transverse beams and capable of individually closing the openings of the receiving grooves of the fixing receiving plate, and a detachable connecting element connecting the fixing receiving plate and the restraining pieces, and the transverse beams are configured to be individually detachable by individually attaching and detaching the restraining pieces. In another embodiment of the present invention, connecting elements are inserted through communication holes provided on both sides of the housing groove of the fixed receiving plate and through communication holes provided on both sides of the housing groove of the restraining piece, thereby gripping and fixing both ends of the transverse beam to adjacent positioning devices. In another embodiment of the present invention, the filter unit has an inclined capture surface formed by arranging transverse beams diagonally, and a horizontal capture surface formed horizontally from the base of the inclined capture surface toward the upstream side. In another embodiment of the present invention, a plurality of horizontal beams are arranged in parallel between fixed support plates integrally provided on a part of the inclined column constituting the support column to form an inclined trapping surface, and a plurality of horizontal beams are arranged in parallel between separate fixed support plates provided on the top surface of a concrete rising section that rises from the support foundation to form a horizontal trapping surface. In another embodiment of the present invention, the fixed support plate and restraining piece constituting the positioning device for the transverse beam are made of steel plate. In another embodiment of the present invention, the connecting element is a connecting bolt or a connecting pin. In another embodiment of the present invention, the support column comprises an inclined column erected with respect to the support foundation toward the downstream side of the river, and one or more bracing columns erected with respect to the support foundation at an angle to support the inclined column. In another embodiment of the present invention, the transverse beam is made of a concrete-filled steel pipe.

Advantages of the Invention

[0008] The present invention has at least one of the following effects. <1> When installing a plurality of horizontal beams, by using a positioning device that allows the horizontal beams to be assembled or removed one by one, even if the installation surface of the horizontal beams has a gradient, the horizontal beams can be installed safely and efficiently. <2> Since the horizontal beams can be assembled one by one, there is no need to worry about the other horizontal beams that have been assembled slipping during the assembly work of the horizontal beams. <3> Even if the horizontal beams are heavy objects weighing several tons, the filter units constituting the permeation capture body can be safely assembled. <4> By a simple operation of only removing a specific restraint piece, the horizontal beams can be replaced one by one. In order to replace a specific horizontal beam, it is not necessary to remove all the restraint pieces. <5> Since the fixed receiving plate and the restraint pieces constituting the positioning device of the horizontal beam are made of steel plates, the positioning device can be manufactured at a low cost, and the installation of the fixed receiving plate is simple.

Brief Description of the Drawings

[0009] [Figure 1] Front view of the horizontal beam type permeable sand control dike (permeable sand control dike) according to the present invention as seen from the upstream side [Figure 2] Perspective view of the permeation capture body constituting the permeable sand control dike [Figure 3] Cross-sectional view of the horizontal beam [Figure 4] Side view of the permeation capture body during assembly [Figure 5] Explanation diagram of the construction method of the permeable sand control dike [Figure 6] Explanation diagram of the assembly method of the permeation capture body

Modes for Carrying Out the Invention

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

[0011] <1>Overview of Horizontal Beam Type Permeable Sand Control Dike This will be described with reference to FIGS. 1 to 4. The horizontal beam type permeable sand control dike (hereinafter referred to as "permeable sand control dike") according to the present invention includes a permeable capture body 10 installed on a support foundation 60 of a riverbed. The permeable sand control dike will be described in detail hereinafter.

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

[0013] <3>Permeable Capture Body The permeable capture body 10 is a permeable framework structure formed by combining a plurality of rigid members such as steel materials, and has a function of capturing flowing materials such as gravel. In the permeable capture body 10 of this example, a filter unit 20 having a permeable structure composed of an aggregate of a plurality of horizontal beams 40, a support pillar 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 plurality of horizontal beams 40 are provided.

[0014] <3.1>Horizontal Beam The horizontal beam 40 is a highly rigid rod-shaped object having a circular or angular cross-sectional shape, and is configured to capture flowing materials such as sediment flowing in a river.

[0015] FIG. 3 shows an example of a horizontal beam 40 made of a concrete-filled steel pipe. This horizontal beam 40 has an outer pipe 41 made of steel pipe, a plurality of reinforcing bars 42 arranged in the longitudinal direction 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 consolidating 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 0.5m and the overall length is about 10m.

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

[0017] <3.2> Filter Unit The filter unit 20 is a filter material made of a horizontal beam 40 installed within the water passage opening 62. The filter unit 20 has an inclined capture surface 21 formed by arranging a plurality of horizontal beams 40 diagonally along the inclined columns 31 of the support columns 30 at a position separated from the support foundation 60, and a horizontal capture surface 22 formed horizontally from the base of the inclined capture surface 21 toward the upstream side at a position separated by a predetermined distance in the height direction from the support foundation 60. A horizontally elongated slit 23 is formed between the multiple horizontal beams 40 (Figure 2). The width dimension of the slit 23 is selected appropriately according to the type of flowing material to be captured.

[0018] In this example, we describe a configuration in which multiple horizontal beams 40 constituting the horizontal trapping surface 22 are supported on the top surface of a rising section 63 that is raised from the support foundation 60. However, the horizontal trapping surface 22 may also be formed by supporting multiple horizontal beams 40 on steel members that extend horizontally upstream from the middle of the inclined column 31 constituting the support column body 30.

[0019] <3.3> Support column The support column 30 is a three-dimensional structure formed by combining multiple rigid members such as steel materials so as to be able to support the filter unit 20. The support column 30 in this example comprises an inclined column 31 erected at an angle to the support foundation 60, and one or more bracing columns 32 erected at an angle to the support foundation 60 so as to support the inclined column 31. The inclined column 31 is tilted toward the downstream side of the river, while the multiple support columns 32 are tilted toward the upstream side of the river. The inclination angle (slope) of the inclined column 31 can be appropriately selected according to the formation angle of the inclined trapping surface 21.

[0020] The inclined column 31 and the multiple bracing columns 32 are rigid members with excellent compressive strength and bending strength, and for example, known mortar-filled steel pipes can be used.

[0021] The inclined column 31 and the bracing column 32 are not limited to a single column body, but may also be constructed by connecting multiple segmented column bodies with bolts or the like.

[0022] <3.4> Positioning device for horizontal beams In this invention, a positioning device 50 is used to fix both ends of a plurality of horizontal beams 40 in an immovable manner. In other words, the positioning device 50 is capable of positioning both ends of a horizontal beam 40 that is installed between adjacent inclined columns 31 and between adjacent rising sections 63.

[0023] Referring to Figure 4.6, the positioning device 50 comprises at least a strip-shaped fixed receiving plate 51 with a plurality of accommodating grooves 51a arranged along its longitudinal direction, a plurality of restraining pieces 52 that can individually close the openings of the accommodating grooves 51a, and a detachable connecting element 53 that connects the fixed receiving plate 51 and the restraining pieces 52. The fixing plate 51 and the restraining piece 52 are preferably made of steel plate.

[0024] <3.4.1> Fixed receiving plate The strip-shaped fixed receiving plate 51 has multiple receiving grooves 51a formed along its longitudinal direction. The accommodating groove 51a is formed as a semicircular, upward-facing opening so that the horizontal beam 40 can be dropped in from above to accommodate it. The fixed receiving plate 51 has one or more connecting holes 51b formed in the extensions between each receiving groove 51a.

[0025] <3.4.2> Restraint piece The restraining piece 52 is a detachable pressing member that works in cooperation with the fixed receiving plate 51 to restrain and position the horizontal beam 40. The restraining piece 52 has a downward-facing, semicircular receiving groove 52a, and a pair of connecting holes 52b are formed in the extensions on both sides of the receiving groove 52a. The accommodating groove 52a is also formed as a semicircular opening capable of accommodating the horizontal beam 40. In this example, we describe a form in which the overall shape of the restraint piece 52 is C-shaped, but the restraint piece 52 may also be U-shaped.

[0026] In this invention, the transverse beams 40 are individually positioned using restraining pieces 52. The reason this invention uses restraining pieces 52 is to ensure the safe installation of the horizontal beams 40 and to facilitate the individual replacement of the horizontal beams 40.

[0027] <3.4.3> Connecting element The connecting element 53 is a detachable connecting member for connecting a plurality of restraining pieces 52 to the fixed receiving plate 51. The connecting element 53 can be fitted with a connecting bolt, which is a combination of a bolt and a nut, but it is also possible to use a connecting pin with the connecting element 53.

[0028] <3.4.4> Mounting position of the fixing support plate of the positioning device Referring to Figure 4, the mounting position of the fixed receiving plate 51 of the positioning device 50 will be explained. The fixing support plate 51 of the positioning device 50 is attached to a part of the inclined column 31 and the top surface of the rising portion 63 which is formed by rising from the support foundation 60.

[0029] To attach the fixing support plate 51 to the inclined column 31, position the fixing support plate 51 with its receiving groove 51a facing upwards along the outer circumferential surface on the upstream side of the inclined column 31, and then weld the bottom surface of the fixing support plate 51 to fix it to the inclined column 31. The fixing support plate 51 may be pre-attached to the inclined column 31, or it may be welded on-site and attached later.

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

[0031] <4> Horizontal beam stopper The horizontal beam 40 is fixed by the positioning device 50, but when the horizontal beam 40 moves in the extension direction (river width direction), stoppers may be provided near both ends of the horizontal beam 40, and the stoppers may be brought into contact with the positioning device 50 to restrict the horizontal beam 40 from moving in the sliding direction.

[0032] [Construction Method for Permeable Sediment Control Dams] Next, I will explain the construction method for permeable sediment control dams.

[0033] <1> Concrete pouring work Referring to Figures 4 and 5, a support foundation 60 is constructed by pouring concrete into the riverbed, and a pair of side walls 61 are constructed on both the left and right sides of the support foundation 60, which are in the direction of the river width.

[0034] <2> Installation work of support columns When constructing the support foundation 60, the diagonal columns 31 and bracing columns 32 that constitute the support column body are erected on the support foundation 60. Specifically, the lower ends of the inclined columns 31 and bracing columns 32 that have been brought to the site are embedded in the support foundation 60, and a concrete rising section 63 is constructed to cover the lower parts of the inclined columns 31 and bracing columns 32. The rising section 63 is formed to be narrow in the direction of river flow, in accordance with the erection positions of the inclined column 31 and the bracing column 32. In addition to functioning as a support member for the horizontal beam 40, the concrete rising section 63 also functions as a protective member for the inclined column 31 and the bracing column 32.

[0035] The height of the rising section 63 can be selected as appropriate. Although not shown in the diagram, in a configuration where a slit-type permeable sediment control dam (secondary dam) is deployed downstream of a horizontal-beam type permeable sediment control dam (main dam), the horizontal trapping surface 22 of the horizontal-beam type permeable sediment control dam and the dam section of the slit-type permeable sediment control dam are set to approximately the same height.

[0036] <3> Horizontal beam framing Referring to Figures 2 and 4, the assembly method of the filter unit 20 using multiple horizontal beams 40 on the upstream side of the support column 30 will be explained.

[0037] <3.1> Assembly of the horizontal trapping surface A strip-shaped fixing support plate 51 is horizontally installed on the top surface of each adjacent rising section 63. A horizontal beam 40 is positioned in the direction of the river width between adjacent fixed support plates 51 facing the river width direction, and both ends of the horizontal beam 40 are dropped into the respective receiving grooves 51a of the adjacent fixed support plates 51. After installing the restraining pieces 52 so as to sandwich both ends of the horizontal beam 40, the restraining pieces 52 and the fixing support plate 51 are connected with connecting elements 53 to fix the horizontal beam 40 one by one. The horizontal trapping surface 22 is assembled by horizontally mounting multiple horizontal beams 40 along a fixed support plate 51 that is positioned horizontally.

[0038] <3.2> Assembly of the Inclined Capture Surface A strip-shaped fixing support plate 51 is pre-installed on each adjacent inclined column 31. A horizontal beam 40 is positioned between adjacent fixed support plates 51, 51 in the direction of the river width, and both ends of the horizontal beam 40 are dropped into the respective receiving grooves 51a. A restraining piece 52 is installed so as to sandwich the end of the horizontal beam 40, and a connecting element 53 is used to connect the restraining piece 52 and the fixed receiving plate 51. The inclined trapping surface 21 is assembled by framing multiple horizontal beams 40 in stages from the lower section to the upper section between the inclined fixed support plates 51, 51 in this manner.

[0039] An example of how to assemble the inclined trapping surface 21 will be explained with reference to Figure 6. The horizontal beams 40 are sequentially mounted horizontally from the lower side to the upper side of the fixed support plate 51. Figures 6(A) and (B) show the configuration in which the transverse beam 40 is housed in the lower housing groove 51a and then the restraining piece 52 is placed over it to hold it in place. The restraining piece 52 may be connected to the fixing plate 51 at both ends simultaneously. However, as shown in Figure 6(A), one end of the restraining piece 52 is pivotally supported to the fixing plate 51 in advance via the connecting element 32. By rotating the restraining piece 52 immediately after it is housed in the housing groove 51a and then mounting it over the horizontal beam 40, the horizontal beam 40 can be fixed in a short amount of time.

[0040] Once the horizontal beam 40 is secured in the lower accommodating groove 51a, another horizontal beam 40 is similarly accommodated and secured in the upper accommodating groove 51a, as shown in Figure 6(C).

[0041] When installing multiple horizontal beams 40 on a sloping fixed support plate 51, the horizontal beams 40 are installed one at a time, starting from the lower part of the fixed support plate 51 and moving upwards. This allows for safe and easy installation without the horizontal beams 40 sliding down. Even if a horizontal beam 40 accidentally slips off during the assembly of the inclined trapping surface 21, other horizontal beams 40 that have been assembled will not slip off in a chain reaction.

[0042] <4> Sediment capture effect by permeable trapping material Rivers carry various types of debris, including relatively fine-grained pebbles and gravel such as mudflows, soil, and sand, as well as driftwood and fallen rocks. When these debris flows from the upstream side to the downstream side of the permeable sediment control dam, the debris passes through the water passage opening 62 of the permeable sediment control dam. In this process, sediment and other flowing materials accumulate upstream of the permeable trapping body 10, and the amount of accumulation gradually increases. As the water level of the flowing material rises, the flowing material such as sediment is captured by the horizontal beams 40 of the horizontal capture surface 22 that constitute the filter unit 20 of the permeable capture body 10, and further captured by the multiple horizontal beams 40 that constitute the inclined capture surface 21.

[0043] When capturing flowing materials such as soil and sand, the horizontal beam 40 is subjected to impact, but this impact force is supported by the rigidity of the horizontal beam 40 and the support column 30. Ultimately, the impact force is absorbed by the riverbed ground via the supporting foundation 60.

[0044] [Method for replacing a horizontal beam] Next, we will explain how to partially replace the horizontal beam 40 of the permeable trapping body 10 installed in a permeable sediment control dam. In other words, when partially replacing a horizontal beam 40, the restraining pieces 52 at both ends of the horizontal beam 40 to be replaced are removed, and then the specific horizontal beam 40 is removed. Then, after replacing the horizontal beam 40 with a new one, the restraining piece 52 is reattached, and the horizontal beam 40 replacement work is completed. In particular, since the horizontal beams 40 can be replaced one at a time, there is no need to remove the restraint pieces 52 of other undamaged horizontal beams 40. Thus, if corrosion or damage occurs to the steel transverse beam 40, the transverse beam 40 can be replaced quickly and easily by simply attaching and detaching a 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... Support column body 31... Oblique pillar 32...Abutment pillar 40····Horizontal beam 41... Outer tube 42..Reinforcement muscles 43...Inner tube 44... Consolidation material 50...Positioning device 51...Fixed receiving plate 51a...Accommodation groove for fixed receiving plate 51b...Connection hole 52...Restriction piece 52a... Retaining groove for restraint piece 52b...Connection hole 53..Connecting element 54... circuit board 60...Supporting foundation 61...Side wall 62····Opening for water passage 63..Right side

Claims

1. A transverse beam type sediment control dam comprising a permeable trapping body installed on a concrete support foundation, the permeable trapping body comprising a filter unit with a permeable structure in which a plurality of transverse beams are erected in parallel in the direction of the river width at a position away from the support foundation, a support column body with a three-dimensional structure formed by combining a plurality of members to stand on the support foundation and support the filter unit, and a transverse beam positioning device capable of individually fixing both ends of the plurality of transverse beams, The positioning device for the transverse beam includes a strip-shaped fixed receiving plate having a plurality of receiving grooves capable of accommodating the transverse beam, The fixed receiving plate has a receiving groove capable of accommodating and restraining the transverse beam, and a plurality of restraining pieces capable of individually closing the opening of the receiving groove, It comprises a detachable connecting element that connects the fixed receiving plate and the restraining piece, The transverse beams are configured to be individually detachable by individually attaching and detaching the aforementioned restraining pieces. A transverse-beam type sediment control dam.

2. A transverse beam type sediment control dam according to claim 1, characterized in that connecting elements are inserted through communication holes provided on both sides of the housing groove of the fixed receiving plate and through communication holes provided on both sides of the housing groove of the restraining piece, thereby gripping both ends of the transverse beam with adjacent positioning devices.

3. The horizontal beam type permeable sediment control dam according to claim 1 or 2, characterized in that the filter unit has an inclined capturing surface formed by arranging horizontal beams diagonally, and a horizontal capturing surface formed horizontally from the base of the inclined capturing surface toward the upstream side.

4. A horizontal beam type permeable sediment control dam according to claim 3, characterized in that a plurality of horizontal beams are arranged in parallel between fixed support plates integrally provided on a part of the inclined column constituting the support column to form an inclined trapping surface, and a plurality of horizontal beams are arranged in parallel between separate fixed support plates provided on the top surface of a concrete rising section that rises from the support foundation to form a horizontal trapping surface.

5. The horizontal beam type permeable sediment control dam according to claim 1, characterized in that the fixed receiving plate and restraining piece constituting the positioning device for the horizontal beam are made of steel plate.

6. The horizontal beam type permeable sediment control dam according to claim 1, characterized in that the connecting element is a connecting bolt or a connecting pin.

7. The horizontal beam type permeable sediment control 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 the support foundation, and one or more bracing columns erected at an angle toward the support foundation so as to support the inclined column.

8. The horizontal beam type permeable sediment control dam according to claim 1, characterized in that the horizontal beam is made of concrete-filled steel pipe.

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