Permeable sediment control dam and construction method for permeable sediment control dam

Abstract

This design simplifies the support structure of the transverse beams of permeable sediment control dams, reduces the number of parts, facilitates construction and maintenance, and improves strength and stability. [Solution] In a horizontal beam type permeable sediment control dam, the groove portion 18 of the door groove steel plate 17 is fitted and fixed to the side wall body 8 which is integrated with the permeable dam body, and the end of the horizontal beam 4 is supported in the groove portion 18 via a slide spacer 30, with multiple horizontal beams 4 spaced apart in the vertical direction, a slide rail 23 is provided in the groove portion 18 of the door groove steel plate 17 so as to extend in the vertical direction, a slide angle 43 is provided on the slide spacer 30 so as to extend in the vertical direction, and the slide angle 43 of the slide spacer is guided by the slide rail 23, the slide spacer 30 is fitted and inserted into the groove portion 18 of the door groove steel plate 17, and the slide spacer 30 and the horizontal beam 4 with its end resting on it are detachably attached and supported to the side wall body 8.

Description

Technical Field

[0001] The present invention relates to a horizontal beam type permeable sand dike, and more specifically, to a horizontal beam type permeable sand dike provided with a support structure for attaching and supporting the ends of horizontal beams to non-overflow dike bodies corresponding to both side walls of a permeable portion, and a construction method for the horizontal beam type permeable sand dike.

Background Art

[0002] Conventionally, in a configuration in which a plurality of horizontal beam members are arranged at intervals in the vertical direction at an opening of a permeable sand dike, both ends of the plurality of beam members are inserted and provided in grooves extending in the vertical direction provided on the inner surfaces of both dike main body portions via spacers in the vertical direction, respectively (see Patent Documents 1 and 2).

[0003] Also, regarding a horizontal beam type open dam, a configuration is known in which a plurality of horizontal beams are detachably attached via support beams between a plurality of buttresses arranged at regular intervals in the transverse direction of a stream (see Patent Document 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The permeable sediment control dam described in Patent Document 1 has a complex structure, in which connecting parts are fixed to the upper and lower surfaces of both ends of the beam member, these connecting parts are fixed to spacers with bolts, and the gap between the groove and the beam member is filled with a filler material. This results in a large number of required parts and makes construction time-consuming.

[0006] Furthermore, the permeable sediment control dam described in Patent Document 2 has a complex structure in which external structural members consisting of four components are attached to both ends of the beam member, and the spacer is attached so that the beam member is placed on it via these external structural members. In addition, the gap between the groove and the beam member is sealed with a seal made of filler material, resulting in a large number of required parts and a time-consuming construction process.

[0007] Figures 8(b) and 8(c) attached to this application show the transverse beam open dam described in Figures 8(a) and 8(b) attached to the abstract of Patent Document 3. This transverse beam open dam has a configuration in which both ends of the transverse beam are supported by buttresses (support walls or buttresses).

[0008] As in the case of the transverse beam open dam described in Patent Document 3, if a buttress is provided adjacent to the non-overflow section of the dam body to attach and support the end of the transverse beam on the dam body side of the non-overflow section, and the end of the transverse beam is attached to this buttress, problems arise such as a reduction in the opening ratio and a complex support structure for the end of the transverse beam. Therefore, this configuration also needs to be further simplified, for example by omitting the buttress.

[0009] The present invention aims to solve the above problems and to realize a horizontal beam type permeable sediment control dam and its construction method that simplifies the support structure of the horizontal beams, reduces the number of parts, and is easy to construct, while also providing strength and stability. This is achieved by providing a support structure in which the ends of multiple horizontal beams, which are spaced apart in the vertical direction facing the opening that forms the flow channel, are attached and supported in vertical grooves formed on the opening side surface of the non-overflow section of the dam body of the horizontal beam type permeable sediment control dam. [Means for solving the problem]

[0010] To solve the above problems, the present invention provides a transverse beam type permeable sediment control dam in which multiple transverse beams arranged in the opening of the permeable dam body are supported by left and right non-overflow dam bodies formed on the left and right sides in the direction of the width of the stream, wherein the permeable dam body is formed by integrating a base plate and the left and right non-overflow dam bodies, the opening is formed by the base plate and the left and right non-overflow dam bodies, the opening side of the left and right non-overflow dam bodies is provided with a grooved steel plate with a concave groove in plan view that extends vertically, and the ends of the transverse beams supported on the slide spacers are attached to the grooves of the left and right grooved steel plates, respectively The present invention provides a transverse sediment control dam of the transverse beam type, characterized in that multiple transverse beams are supported in multiple stages with vertical spacing between them via slide spacers, which can be fitted together; slide rails are provided on the front and rear inner surfaces of the groove portion of the door groove steel plate, facing each other from the front and rear, and extending vertically along the groove portion; slide angles are provided on the front and rear of the side surface of the slide spacer, extending vertically; and the slide spacer is configured to slide vertically within the groove portion of the door groove steel plate together with the ends of the transverse beams, with the slide angles guided by the slide rails.

[0011] The left and right non-overflow sections of the dam body are formed with sleeve ends that widen upwards, and it is preferable that the groove portion of the door groove steel plate extends to the sleeve end surface.

[0012] The gate groove steel plate is a strip-shaped member extending in the vertical direction, and has a groove portion and a protruding portion and a folded portion extending in the front-rear direction from the opening edge of the groove portion, respectively. The protruding portion and the folded portion are L-shaped in plan view, and it is preferable that the protruding portion and the folded portion are fixed to the side surface of the non-overflow section of the dam body so that the surface of the protruding portion is exposed.

[0013] The slide spacer comprises a rectangular outer frame in plan view, consisting of front and rear side sections and left and right side sections; a support recess formed in the upper half of the outer frame; and the slide angle extending vertically from the rear side section of the left and right side sections of the outer frame. Rectangular through-holes opening upward are formed in the left and right side sections of the slide spacer, and the support recess is preferably composed of a shelf and front and rear inner wall plates, and is positioned between the rectangular through-holes formed in the left and right side sections.

[0014] To solve the above problems, the present invention provides a method for constructing a transverse sediment control dam of the transverse beam type, comprising a base plate, a permeable dam body with left and right non-overflow dam bodies in the direction of the width of the stream, an opening, and multiple transverse beams, wherein when constructing the left and right non-overflow dam bodies, grooved steel plates having grooves are fixed to the opening side surfaces of the left and right non-overflow dam bodies, slide spacers are detachably fitted into the grooves of the left and right grooved steel plates, and the ends of the transverse beams are placed on and held by the slide spacers, and the multiple transverse beams are provided in the opening in multiple stages with gaps between them via slide spacers in the vertical direction, and when fitting and inserting the slide spacers into the grooves of the grooved steel plates, slide rails provided in the grooves of the grooved steel plates facing each other from the front and back guide the slide angles provided on the front and rear of the side surfaces of the slide spacers.

[0015] The grooved steel plate is a strip-shaped member extending in the vertical direction, and is equipped with a groove portion and protruding and folded portions extending forward and backward from the opening edge of the groove portion. When constructing the non-overflow portion of the dam body on the left and right sides of the permeable portion by pouring concrete, it is preferable to use the grooved steel plate as part of the formwork on the opening side, and to leave the grooved steel plate as residual formwork after the concrete has been poured, fixing the protruding and folded portions to the sides of the non-overflow portion of the dam body before and after the groove portion.

[0016] Preferably, the front and rear ends of two steel plates are bent so that they face each other to form the front and rear side ends of the two steel plates, and the opposing ends of the front and rear side ends are welded together to form a rectangular outer frame in plan view. The upper halves of the left and right sides of the outer frame are cut out in a concave shape with a width and height that can receive and hold the ends of the horizontal beams, respectively, to form rectangular through-holes that open upwards. Support recesses that open upwards are provided, consisting of a shelf board and front and rear inner wall boards, positioned between the rectangular through-holes formed on the left and right sides. A slide angle is fixed to the rear side of the left and right sides of the outer frame so as to extend vertically to form a slide spacer. [Effects of the Invention]

[0017] The following remarkable effects are achieved by the transverse beam type permeable sediment control dam and its construction method according to the present invention.

[0018] (1) On the opening side of the left and right side walls (non-overflow section of the dam) which are integrated with the bottom slab of the permeable section of the dam, a grooved steel plate is provided with a concave groove in plan view that extends vertically. A slide spacer is fitted into the groove of this grooved steel plate and inserted, and the horizontal beam is attached and supported via the slide spacer, so that the horizontal beam can be supported firmly and stably.

[0019] (2) A slide rail is provided in the groove of the door groove steel plate, and a slide angle is provided on the slide spacer. The slide angle is guided by the slide rail, and the slide spacer is fitted into the groove of the door groove steel plate and installed. The horizontal beam is then installed in the support recess. This allows the horizontal beam to be easily attached and detached to the side wall of a horizontal beam type permeable sediment control dam, facilitating construction, maintenance, and other operations, as well as facilitating the removal of accumulated soil, rocks, driftwood, etc.

[0020] (3) Complex structural components become unnecessary, and the number of parts can be reduced, leading to rationalization such as labor savings in design and construction, and shorter construction periods, thereby reducing construction costs. [Brief explanation of the drawing]

[0021] [Figure 1] An embodiment of the horizontal beam type permeable sand control dike according to the present invention, showing the overall configuration as viewed from the upstream side of the stream. (a) is a perspective view, and (b) is a front view. [Figure 2] The above embodiment, (a) is a cross-sectional view taken along line A-A of FIG. 1(b), and (b) is a plan view. [Figure 3] A view for explaining the slide spacer of the above embodiment. (a) is a perspective view of the slide spacer, and (b) to (d) are perspective views for explaining the manufacturing process of the slide spacer. [Figure 4] A view for explaining the constituent members of the slide spacer of the above embodiment and its assembly, which is a perspective view seen from the obliquely forward direction on the stream bank side. [Figure 5] A view for explaining the slide spacer of the above embodiment. (a) is a front view seen in the stream bank direction of the stream width, (b) is a side view seen from the upstream side of the stream, and (c) is a plan view. [Figure 6] A view for explaining the support structure of the horizontal beam of the above embodiment. (a) is a front view of the support structure seen in the stream bank direction, (b) is a horizontal cross-sectional view of the door groove steel plate attached to the side wall of the permeable part dike body, (c) is an enlarged view of the main part of the horizontal cross-section showing the relationship between the slide rail of the door groove steel plate and the slide angle of the slide spacer guided by the slide rail, (d) is a horizontal cross-sectional view showing the support state in which the slide spacer and the end of the horizontal beam are fitted and inserted into the groove part of the door groove steel plate, and it is also a view for explaining the influence of the external force received by the horizontal beam on the support structure. [Figure 7] A view for explaining the support structure of the horizontal beam of the above embodiment. (a) is a perspective view of the support structure at the upper end side of the upper part of the side wall body, (b) is a perspective view of the box lid seen from two different angles, and (c) is a perspective view of the support structure of the side wall body. [Figure 8](a) is a perspective view showing the overall configuration of a modified example of the transverse beam type sediment control dam according to the present invention, and (b) and (c) are well-known examples (figures attached to the abstract of Reference 3) that are cited to explain the configuration for attaching the transverse beam to the buttress in the modified example. [Figure 9] In a modified example of the transverse beam type permeable sediment control dam according to the present invention, the following diagrams are referenced to illustrate the configuration for attaching the transverse beam to the buttress: (a) is the overall configuration of a well-known transverse beam type permeable sediment control dam, and (b) is a perspective view of the main part showing the configuration for attaching the transverse beam to the buttress. [Figure 10] The above diagram illustrates the components required for the other well-known example, where (a) is a plan view of the joint spacer, (b) is a side view of the joint spacer, and (c) is a plan view showing the configuration in which the ends of the joint spacer are assembled to the buttress, with the dotted lines indicating the ends of the horizontal beams. [Best Mode for Carrying Out the Invention]

[0022] The embodiments for implementing the transverse beam type permeable sediment control dam and its construction method according to the present invention will be described below with reference to Figures 1 to 8, based on examples and other information. [Examples]

[0023] An example of the transverse beam type permeable sediment control dam 1 and its construction method according to the present invention will be explained in Figures 1 to 7. In the invention described herein and in the claims, when the transverse beam type permeable sediment control dam 1 is viewed visually from the upstream side to the downstream side of a stream, the near side (front) is referred to as the front, the rear side as the rear, and the left and right sides, which are in the width direction of the stream, are referred to as the left-right direction or stream width direction.

[0024] The same principles regarding the front-to-back and left-to-right (stream width direction) of the horizontal beam type permeable sediment control dam 1 apply to the members and components that make up the horizontal beam type permeable sediment control dam 1.

[0025] Overall structure: In this embodiment, the overall configuration of the transverse beam type permeable sediment control dam 1 according to the present invention is as shown in Figures 1 and 2, and comprises a permeable dam body 2, an opening 3 for water passage provided in the permeable dam body 2 to serve as a flow path, and a plurality of transverse beams (beam members) 4 arranged horizontally in multiple stages with vertical spacing facing the opening 3.

[0026] The permeable section dam body 2 is formed by integrating the base plate 7 with the left and right side walls (non-overflow section dam body) 8, which are formed on the left and right sides in the direction of the stream width. The opening 3 is formed by the base plate 7 and the left and right side walls (non-overflow section dam body) 8. The upper parts of the left and right side walls 8 are provided with sleeve openings that spread out upward toward each other, and the stream-facing side surface 10 of the side wall 8 has a sleeve opening 9 (see Figure 1) above it.

[0027] In this embodiment, the horizontal beam type permeable sediment control dam 1 is constructed in a narrow stream, and a single-span dam (a dam with one opening) with an opening width of about 2 to 5 m will be described. In a single-span dam, the left and right ends of the horizontal beam 4 are attached to and supported by the left and right side walls 8, respectively, by the support structure 11 described later.

[0028] As will be explained in the modified examples of this embodiment described later, in a horizontal beam type permeable sediment control dam 50 with an opening width exceeding approximately 6 m, a buttress is provided in the middle of the opening. Even in a horizontal beam type permeable sediment control dam 50 having such a wide opening, the support structure 11 and construction method for attaching the ends of the horizontal beams 4 to the side wall body 8 according to the present invention can be applied.

[0029] As shown in Figures 1 and 2, the horizontal beam type permeable sediment control dam 1 faces the opening 3 and has multiple vertical beams 12 erected on the base plate 7. In this embodiment, the multiple vertical beams 12 are installed in contact with the front surface of the lowest horizontal beam 4.

[0030] Furthermore, the side walls (non-overflow section embankment) adjacent to and integrated with the permeable section embankment 2 are constructed with appropriate widths on the left and right sides, according to the width of the stream, as shown by the solid lines in Figure 1.

[0031] As shown in Figure 2, a top beam 13 is provided above the opening 3, spanning between the left and right side walls 8. The top beam 13 is formed from a composite member of H-shaped steel and concrete.

[0032] Support structure: The main features of the horizontal beam type permeable sediment control dam 1 and its construction method according to the present invention lie in the support structure and construction method, which involves horizontally attaching a plurality of horizontal beams 4 to the opening 3 at vertical intervals.

[0033] Specifically, the invention relates to a support structure 11 (see Figures 1, 2, 6, 7, etc.) that attaches and supports the ends of the horizontal beams 4 to the left and right side walls 8 of the opening 3, and to a construction method for constructing the support structure 11. Therefore, the following explanation will focus on this support structure 11 and its construction method.

[0034] In the horizontal beam type permeable sediment control dam 1, grooves 18 (also called "steel plate grooves") of gate groove steel plates 17 are formed in the left and right side walls 8, extending vertically from their lower ends to their upper ends and continuing to the sleeve ends 9. These grooves 18 are formed while also functioning as permanent formwork when the side walls 8 adjacent to the permeable dam body 2 are constructed with concrete.

[0035] As shown in Figures 6(b), (d), 7(a), and (c), the groove 18 is embedded so as to be exposed on the side surfaces 9 (the faces towards the center of the stream) of the left and right side walls 8 of the horizontal beam type permeable sediment control dam 1.

[0036] As shown in Figures 6(a), (b), (d), and 7(a), (c), the door groove steel plate 17 includes a concave groove portion 18, a protruding portion 19 extending in the front-rear direction from the opening edge 24 of the groove portion 18 (see Figure 6(b)), and a folded portion 20 that is folded back in the left-right direction (towards the riverbank) from the protruding portion 19.

[0037] The protruding portion 19 and the folded portion 20 are L-shaped in a horizontal view. The door groove steel plate 17, overall, has a roughly hat-shaped horizontal cross-section (see Figures 6(b) and (d)) and is formed in a strip shape that extends in the vertical direction.

[0038] In the construction of the permeable section dam body 2 of the horizontal beam type permeable sediment control dam 1, the grooved steel plate 17 and its groove portion 18 are used as part of the formwork when concrete is poured to form the side wall body 8 (non-overflow section dam body) adjacent to the permeable section dam body 2. After the concrete is poured, they remain as residual formwork and are installed on the side of the side wall body 8, performing their function as grooved steel plate 17.

[0039] In the left and right side walls 8 of the horizontal beam type permeable sediment control dam 1, the groove portion 18 of the door groove steel plate 17 is embedded in the side surface 10 of the side wall 8, extending to the sleeve end 9, and the overhang portion 19 and the folded portion 20 are embedded in the side surface 10 of the side wall 8, extending to the sleeve end 9, so that the overhang portion 19 is exposed on the side surface 9 of the side wall 8 (see Figures 1, 2, 6(b), (d), 7(a), (c), etc.).

[0040] As shown in Figures 6(b) to (d), slide rails (guide rails) 23 are provided on the front and rear inner surfaces 22 at the back of the groove 18 of the door groove steel plate 17 (near the bottom surface 21 of the groove 18), so as to protrude from each other in the front-rear direction. The slide rails 23 are provided so as to extend along the entire length of the door groove steel plate 17 in the longitudinal direction.

[0041] Multiple horizontal beams 4 are supported at both their left and right ends by resting on the shelves 39 of the slide spacers 30, and the slide spacers 30 are fitted into the grooves 18 of the door groove steel plate 17, thereby being attached to and supported by the side wall body 8 via the left and right slide spacers 30, with a vertical gap between them (see Figures 1, 2, 6(a), 7(a), and (c)).

[0042] Slide spacer: As shown in Figures 3(a) and 5, the slide spacer 30 has an overall configuration that, in plan view, comprises a rectangular outer frame 32, a support recess 42 formed in the upper half of the outer frame 32, and slide angles 43 provided vertically on the front and rear of the rear side portion 34 (the side portion on the riverbank side) of the left and right side portions 34 of the outer frame 32.

[0043] Here, "the rear side portion 34 (the side portion on the stream bank side) of the left and right side portions 34 of the outer frame 32" means that for the slide spacer 30 attached to the gate groove steel plate 17 of the left side wall (non-overflow section dam body) 8 when viewed from the upstream side, the rear side portion 34 is the left side portion 34, and for the slide spacer 30 attached to the gate groove steel plate 17 of the right side wall (non-overflow section dam body) 8 when viewed from the upstream side, the rear side portion 34 is the right side portion 34.

[0044] The outer frame 32 is formed in a rectangular shape in plan view from the front and rear side portions 33 and the left and right side portions 34. Rectangular through-holes 35 that open upward are formed in the left and right side portions 34, and a shelf board 39 and front and rear inner wall plates 40 are provided corresponding to these through-holes 35 to form a support recess 42.

[0045] To clarify the configuration and assembly of the slide spacer 30, its manufacturing process will be explained in the following order of manufacturing steps (1) to (5), with reference to Figures 3 and 4, etc.

[0046] (1) Two steel plates are folded at the front and back to form side edges 36, thereby producing two steel plates 31 with a concave horizontal cross-section (see Figure 3(b)). (2) The two steel plates 31 are joined together at their front and rear side ends 36, as shown in Figure 3(c), and welded together as shown in the welded portion 37, to form an outer frame 32 with a rectangular horizontal cross-section. The outer frame 32 is integrally formed from the front and rear side portions 33 and the left and right side portions 34.

[0047] (3) The left and right side portions 34 of the outer frame 32 (both side portions in the direction of the stream width) are cut from the top end as shown by the dotted lines in Figure 3(d), forming a rectangular through-hole 35 that opens upward. This rectangular through-hole 35 is sized to fit the horizontal beam 4 just as shown in Figures 6(a), (d), etc. That is, the front-to-back width and height of the through-hole 35 are slightly larger than the diameter of the horizontal beam 4.

[0048] (4) As shown in Figure 4, a bottom plate 38, a shelf plate 39, front and rear inner wall plates 40, and front and rear cover plates 41, all made of steel plate, are prepared and welded to the outer frame 32 to close the bottom opening 38', the surface 39' connecting the lower edges of the left and right through holes 35, the front and rear inner surfaces 40', and the front and rear top openings 41', respectively. The support recess 42 surrounded by the shelf plate 39 and the front and rear inner wall plates 40 is the part on which the left and right ends of the horizontal beam 4 are placed and supported.

[0049] (5) As shown in Figure 4, slide angles 43 made of angle steel with a roughly L-shaped horizontal cross section extending vertically are welded to the front and rear ends of the left side surface portion 34 of the slide spacer 30 which is fitted into the groove portion 18 of the door groove steel plate 17 of the left side wall body 8.

[0050] Similarly, regarding the slide spacer 30 that is fitted into the groove 18 of the door groove steel plate 17 of the right side wall body 8, although it is not directly shown, the configuration is the same as the slide spacer 30 shown in Figure 4, although it is the reverse of the left and right sides. Slide angles 43 made of angle steel with a roughly L-shaped horizontal cross-section extending in the vertical direction are welded along the front and rear ends of the right side surface portion 34. In this way, the slide spacer 30 shown in Figures 3(a), 5, etc. is formed.

[0051] As described above, the slide spacer 30 comprises a rectangular outer frame 32 in plan view, consisting of front and rear side portions 33 and left and right side portions 34; a support recess 42 formed in the upper half of the outer frame 32; and slide angles 43 provided in the vertical direction on the front and rear of the left or right side portion 34 of the outer frame 32.

[0052] Furthermore, rectangular through-holes 35 opening upwards are formed in the left and right side portions 34, and a shelf board 39 is provided on the bottom surface 39' connecting the bottom edges of the left and right through-holes 35, and an inner wall board 40 is provided on the side surfaces 49' connecting the left and right side edges in front of and behind the left and right through-holes 35, thereby forming a support recess 42 (see Figures 3(a), 4, and 5).

[0053] As shown in Figures 6(a), (d), and 7(a), (c), the slide spacer 30 is fitted into the groove 18 of the door groove steel plate 17, and its slide angle 43 is guided by the slide rail 23 provided on the door groove steel plate 17, allowing it to slide smoothly in the vertical direction.

[0054] Therefore, the size and shape of the horizontal cross-section of the slide spacer 30 are such that it fits into the groove 18 of the door groove steel plate 17 and can slide vertically (a similar shape with a slightly smaller cross-sectional dimension than the groove 18).

[0055] More specifically, as shown in Figure 6(d), the width W1 of the slide spacer 30 in the front-rear direction is slightly smaller than the width W2 of the door groove steel plate 17 in the front-rear direction. As a result, as shown in Figure 6(a), the slide spacer 30 is fitted into the groove 18 of the door groove steel plate 17 and is detachably installed, and is configured to slide in the vertical direction.

[0056] Then, as shown in Figure 6(d), the width (width in the left-right direction) S1 of the slide spacer 30 is made smaller than the depth S2, which is the width of the groove 18 of the door groove steel plate 17, so that a gap 47 remains between the left and right side portions 34 of the slide spacer 30 and the bottom surface 21 of the groove 18 of the door groove steel plate 17.

[0057] As shown in Figure 6(d), this gap 47 is a gap that allows the slide angle 43 of the slide spacer 30 to be guided by the slide rail 23 of the groove 18 of the door groove steel plate 17, enabling it to slide smoothly up and down in the vertical direction.

[0058] Construction method: This document describes the construction method for the horizontal beam type permeable sediment control dam 1 according to the present invention. In particular, the horizontal beam type permeable sediment control dam 1 according to the present invention employs a novel support structure 11 in which multiple horizontal beams 4 are mounted via slide spacers 30 in grooves 18 of door groove steel plates 17 provided on the side surfaces 9 of the left and right side walls 8 of the opening 3, and are mounted and supported in multiple stages with vertical spacing. This document will focus on this support structure 11 for mounting and supporting the ends of the horizontal beams 4, and will describe its construction method below.

[0059] The construction method for the permeable section dam body 2 of the horizontal beam type permeable sediment control dam 1 is basically the same as the conventional method, but as described above, the grooved steel plate 17 is used as part of the formwork when forming the side wall body 8 (non-overflow dam body section) of the permeable section dam body 2 by pouring concrete, and even after the concrete is poured, it is used as a remaining formwork on the side 9 of the side wall body 8, as one of the members that constitute the support structure 11 that supports the end of the horizontal beam 4.

[0060] When constructing the support structure 11 at the end of the horizontal beam 4, the slide spacer 30 is fitted into the groove 18 of the door groove steel plate 17 at the sleeve end 9.

[0061] During installation, the slide angle 43 provided on the slide spacer 30 is guided by the slide rail 23 provided in the groove 18 of the door groove steel plate 17, as shown in Figure 6(c).

[0062] More specifically, the slide spacer 30 is fitted into the groove 18 of the door groove steel plate 17 from above, and as shown in Figures 6(b) to (d), the slide angles 43 provided on the front and rear of the slide spacer 30 are guided by slide rails 23 provided on the front and rear of the inner surface 22 near the bottom surface 21 of the groove 18 of the door groove steel plate 17.

[0063] Then, the slide spacer 30 is guided by the slide rails 23 at the front and rear of the groove 18 of the door groove steel plate 17, and slides down within the groove 18 of the door groove steel plate 17 by its own weight. The slide spacer 30 that supports the lowest horizontal beam 4 descends to the bottom plate 7 within the groove 18 of the door groove steel plate 17 and is fixed in place.

[0064] Subsequently, the horizontal beam 4 is inserted into the groove 18 of the door groove steel plate 17 at the sleeve end 9, and is slid down by its own weight, so that both the left and right ends of the horizontal beam 4 are set on the shelf 39 of the slide spacer 30 that has already been set in place.

[0065] In this manner, the slide spacer 30 is placed in the groove 18 of the door groove steel plate 17, and then the horizontal beam 4 is placed on the shelf 39 of the slide spacer 30. The process of placing the horizontal beam 4 and slide spacer 30 on the bottom plate 7 or the lower slide spacer 30 is repeated, so that multiple horizontal beams 4 are installed on the left and right side walls 8 in multiple layers with vertical spacing between them.

[0066] Alternatively, the left and right ends of the horizontal beam 4 may be supported in advance by the left and right slide spacers 30, and both the slide spacers 30 and the horizontal beam 4 may be fitted into the grooves 18 of the door groove steel plate 17 and lowered, and then placed on the bottom plate 7 or the lower slide spacer 30. This process may be repeated to attach and support the left and right ends of multiple horizontal beams 4 to the left and right side walls 8 at vertical intervals, thereby installing the horizontal beams 4 in multiple stages at vertical intervals.

[0067] To prevent debris flows and other debris from entering, it is advisable to fit and attach a box cover 44, as shown in Figures 7(a) and (b), to the opening at the upper end of the groove 18 of the door groove steel plate 17 from above the sleeve end, thereby closing the opening at the upper end of the groove 18.

[0068] (effect, etc.) In the horizontal beam type permeable sediment control dam 1 and its construction method according to the present invention, as shown in Figures 1, 2, 6, and 7, a support structure 11 is adopted in which slide spacers 30 are fitted into grooves 18 of door groove steel plates 17 provided on the left and right side walls 8 (non-overflow section dam body), and multiple horizontal beams 4 are attached and supported detachably at vertical intervals via the slide spacers 30.

[0069] The operation and effects of the horizontal beam type permeable sediment control dam 1, which features such a support structure 11, and its construction method will be explained below.

[0070] By employing a support structure 11 that allows for the detachable attachment and support of multiple horizontal beams 4 in the grooves 18 of the door groove steel plate 17 via slide spacers 30, the work of attaching and detaching the horizontal beams 4 to and from the grooves 18 of the door groove steel plate 17 becomes easier, and the work of removing soil, rocks, driftwood, etc., captured and deposited by the horizontal beam type permeable sediment control dam 1 becomes easier.

[0071] Furthermore, maintenance work such as repairing damage to the permeable section of the dam body 2, and repairing or replacing components such as the slide spacer 30 and the transverse beam 4, becomes easier.

[0072] The grooved steel plates 17, which were used as part of the formwork during the construction of the left and right side walls 8 adjacent to the permeable embankment 2, were left as residual formwork on the side surfaces 9 of the side walls 8 after construction, and the grooves 18 of the grooved steel plates 17 were embedded in the side surfaces 10 of the side walls 8, making the installation of the grooved steel plates 17 easy.

[0073] Furthermore, a slide rail 23 is provided within the groove 18 of the door groove steel plate 17, and the slide rail 23 guides the slide angle 43 provided on the slide spacer 30, which is fitted into the groove 18 and inserted, so that the slide spacer 30 fits into the groove 18, slides and settles in place, thus enabling smooth sliding and settling of the slide spacer 30.

[0074] Since a support structure 11 is adopted in which the horizontal beam 4 is attached to and supported by the side wall body 8 via a slide spacer 30 that is fitted and inserted into the groove portion 18 of the door groove steel plate 17, the slide spacer 30 or the horizontal beam 4 can be supported firmly and stably.

[0075] Specifically, for example, as shown in Figure 6(d), when a gravel impact force F, which is the maximum external force, acts on the transverse beam 4, this external force acts as a shear fracture stress from the end of the transverse beam 4 to the downstream side surface of the groove 18 and to the downstream side surface of the side wall 8, as shown in the shear section in Figure 6(d).

[0076] However, in the support structure 11, the groove portion 18 of the door groove steel plate 17 is embedded in the side wall body (non-overflow section embankment) 8, so shear resistance force is exerted in the assumed shear surface shown by the dashed line between the groove portion 18 of the door groove steel plate 17 and the concrete of the side wall body 8, ensuring sufficient strength and stability.

[0077] Furthermore, when a horizontal external force F such as gravel impact force is applied, the structure is such that the groove portion 18 of the door groove steel plate 17 and the side wall body 8 receive the external force F, and the slide rail 23 of the groove portion 18 of the door groove steel plate 17 is not affected by the above horizontal external force and does not deform, so there is little damage or change over time that affects the sliding of the slide rail 23 and slide angle 43, and the attachment and detachment function can be maintained.

[0078] The support structure 11 is configured to support the horizontal beam 4 by attaching it to the side wall body 8 adjacent to the permeable embankment body 2 at both ends, so as to be embedded within the groove 18 of the door groove steel plate 17 without the use of buttresses or the like.

[0079] As a result, the protrusions from the side wall 8 toward the center of the opening are eliminated, increasing the opening ratio of the horizontal beam type permeable sediment control dam 1 and improving its debris flow trapping function.

[0080] In a horizontal-beam type permeable sediment control dam 1, the horizontal beams 4 are attached and supported at both ends to the side walls 8 adjacent to the permeable dam body 2 without the need for buttresses or the like. This eliminates the need for complex structural components and reduces the number of parts, leading to streamlined design and construction, shorter construction periods, and more economical construction costs.

[0081] A slide rail 23 is provided in the groove 18 of the door groove steel plate 17, and the slide angle 43 of the slide spacer 30 is guided and supported by this slide rail 23 in a detachable configuration. As a result, the support structure 11 of the horizontal beam 4 has a simple configuration, improving constructability, such as making it easier to install the horizontal beam 4 during the construction of the horizontal beam type permeable sediment control dam 1.

[0082] (modified version) Modified examples of the horizontal beam type permeable sediment control dam and its construction method according to the present invention will be described with reference to Figure 8. The horizontal beam type permeable sediment control dam 1 of the above embodiment is a single-span dam suitable for narrow streams, with an opening 3 having a narrow opening width of about 2 to 5 m.

[0083] If the opening width of the opening 3 exceeds approximately 6 m, a buttress 51 is installed in the middle of the stream width direction in the opening 3 (in this modified example, at the center of the stream width), as shown in the modified example of the horizontal beam type permeable sediment control dam 50 in Figure 8(a). One end of the horizontal beam 4 on the stream center side is attached to the buttress for support, and the horizontal beam 4 is arranged in multiple vertical rows in two horizontal rows.

[0084] In this modified example of a transverse-beam type sediment control dam 50, the ends of the multiple transverse beams 4 on the left and right sides are attached to and supported by the side wall 8 (non-overflow section dam body) using the same support structure 11 as in the above embodiment.

[0085] The left and right multi-tiered horizontal beams 4 are supported at their respective ends on the stream-side, attached to buttresses 51. The support structure for attaching and supporting the horizontal beams 4 to the buttresses 51 can be a conventionally known configuration.

[0086] As an example of a well-known configuration, we will explain using the configuration of Selected Figure 2, which shows a horizontal beam type open dam, attached to the abstract of Patent Document 3 (Japanese Patent Application Publication No. 2005-336802), as shown in Figures 8(b) and (c). The reference numerals in Figures 8(b) and (c) (Selected Figures (a) and (b) of the abstract of Patent Document 3) are the same as those described in Patent Document 3.

[0087] As shown in Figure 8(b) (Selected Figure (a) of the Abstract of Patent Document 3), the end of the horizontal beam 24 on the stream-center side is attached to the buttress 3. Regarding this attachment, the Abstract of Patent Document 3 states that "the buttress 3 has a plurality of support beams 16 that protrude laterally in accordance with the slit spacing, and the horizontal beam 16 (Note: the applicant believes that 16 is a typo for 24) has notches 25 (fitting parts) formed at both ends that fit with the support beams 16, and is attached to the buttress 3 in a detachable manner by fitting the notches 25 into the support beams 16 and placing it horizontally" (see Selected Figure (b) of the Abstract of Patent Document 3).

[0088] In the modified horizontal beam type permeable sediment control dam 50, the ends of the horizontal beams 4 on each side wall 8 are attached to and supported by the side wall 8 with the same support structure 11 as in the above embodiment, and the ends on the stream center side are attached to and supported by the buttress 51 with a well-known configuration as shown in Patent Document 3.

[0089] In the modified horizontal beam type permeable sediment control dam 50, another well-known configuration in which the end of the horizontal beam 4 on the stream-center side is attached to the buttress 51 will be explained using the horizontal beam type permeable sediment control dam 60 shown in Figure 9(a).

[0090] This horizontal beam type permeable sediment control dam 60 is a two-span dam, similar to the horizontal beam type permeable sediment control dam 50 of the modified example described above. The multiple horizontal beams 4 are installed in multiple stages between the buttresses 61 on the side wall and the buttress 62 in the center in the direction of the stream width, as shown in Figure 9(a).

[0091] As shown in Figures 9(a) and (b), the end 63 of the horizontal beam 4 on the stream-center side is held by a joint spacer 66 to the upstream end of the buttress 62 in the stream width direction, with vertical spacing ensured.

[0092] Since this configuration is well known, when applying the present invention to a two-span dam such as the modified horizontal beam type permeable sediment control dam 50, it can be adopted as another well known configuration in which the end of the horizontal beam 4 on the stream-center side is attached to the buttress 51 in the center of the stream width direction.

[0093] The joint spacer 66 is made of steel plate and, as shown in Figures 9(b), 10(a), and (b), has a roughly semi-cylindrical section 67 and a housing section 68 integrally formed front and rear. The housing section 68 is lower in height than the roughly semi-cylindrical section 67 and functions as a support shelf 69 on which the end 63 of the horizontal beam 4 is placed. Crushed stone or the like is packed inside the housing section 68 to increase its strength against debris flows from upstream.

[0094] As shown in Figures 10(b) and (c), a slip stopper 70 is provided projecting upward from the upper surface of the housing 68 to prevent the horizontal beam 4 from shifting laterally. The left and right side walls of the housing 68 are each made of halved straight steel sheet piles 71, and a joint 72 is formed vertically at the rear end (downstream end) facing downstream.

[0095] The left and right straight steel sheet piles 76 on the upstream side that constitute the buttress 61 each have joints 77 formed vertically at their upstream ends, facing upstream. The joint 72 of the joint spacer 66 engages with these joints 77 of the buttress 61 in a way that allows for engagement and disengagement, and also allows for sliding in the vertical direction.

[0096] During installation, the lowest joint spacer 66 and its joint 72 are engaged from the upper end with the joint 77 of the buttress 61, as shown in Figure 10(c), and the joint spacer 66 is slid downward to be fixed in place on the upstream end of the buttress 61 and on the bottom plate 80. Then, the end 63 of the horizontal beam 4 is placed on the mounting shelf 69 of the joint spacer 66 and held in place.

[0097] The upper joint spacers 66 are stacked sequentially on top of the lower joint spacers 66 in the same manner, and the upper horizontal beam 4 is placed and held at the upstream end of the buttress 61 and on the mounting shelf 89 of the lower joint spacers 66, so that the ends 63 of multiple horizontal beams 4 are sequentially held on the upstream side of the central buttress 61.

[0098] By employing such a well-known method, the upstream end of the buttress 61 and the joint spacer 66 are fitted together by the joints 72 and 77 of the respective straight steel sheet piles 71 and 76, so that the joint spacer 66 can hold the end 63 of the transverse beam 4 and also slide vertically and be detachable.

[0099] The embodiments for implementing the horizontal beam type permeable sediment control dam and its construction method according to the present invention have been described above based on examples. However, it goes without saying that the present invention is not limited to these embodiments, and there are various embodiments within the scope of the technical matters described in the claims. [Industrial applicability]

[0100] The horizontal beam type permeable sediment control dam and its construction method according to the present invention have a simple structure, a reduced number of parts, simplified construction, and a configuration in which the horizontal beams can be attached and detached, making them ideal for use in sediment control dams and the like in narrow mountain streams where debris flows occur frequently and the environment for carrying out maintenance such as removing accumulated sediment and replacing parts is relatively poor. [Explanation of Symbols]

[0101] 1. Permeable sediment control dam 2 Transmission section embankment body 3 Opening 4 horizontal beams 7. Bottom plate of the transparent section 8 Side wall body (non-overflow section embankment body) 9 Sleeve edge 10 Side view of the side wall 11 Support structure 12 vertical beams 13 Top beam 17 Door ditch steel plate 18. Groove portion of door groove steel plate 19. Protruding sections of the door groove steel plate to the front and rear 20. Folded portion from the protruding part of the door groove steel plate 21. Bottom surface of the groove in the gate groove steel plate (the side facing the stream bank) 22. Inner surfaces of the grooves on the front and rear of the steel plate grooves (upstream and downstream surfaces of the stream) 23 Slide rails installed in the grooves of the door groove steel plate 24 Opening edge of groove section of door groove steel plate 30 Slide Spacers 31. Steel plate, which is the material for the outer frame of the slide spacer. 32 Slide Spacer Outer Frame 33 Front and rear side sections of the outer frame 34. Left and right side sections of the outer frame 35 Through holes formed on the left and right sides of the outer frame 36 Side edges of the steel plate that is the material of the outer frame 37 Butt weld at the side end 38. Bottom plate of slide spacer 39. Shelf with sliding spacer 40 Front and rear inner wall panels of the slide spacer 41 Front and rear cover plates of the slide spacer 42 Support recess for slide spacer 38' bottom opening 39' The plane connecting the lower edges of the left and right through-holes. 40' The anterior-posterior inner surface connecting the left and right lateral edges at the anterior-posterior of the left and right through-holes. 41' Top opening around the front 43 Slide angle provided on the slide spacer 44 Box Lids 47. Gap between the slide spacer and the groove of the door groove steel plate. 50. Transverse-beam type sediment control dam 51 Buttresses 60. Transverse-beam type sediment control dam 61 Buttresses on the side wall 62 Buttress in the center of the stream's width 63 The end of the horizontal beam on the stream-center side. 66 Joint Spacer 67 Semi-cylindrical section of joint spacer 68. Housing of the joint spacer 69 Shelves 70 Anti-slip 71. Half-cut straight steel sheet piles for joint spacers. 72 Joint spacer fittings 76 Buttress Straight Steel Sheet Piles 77 Buttress joints 80 bottom version

Claims

1. A transverse beam type sediment control dam in which multiple transverse beams positioned at the opening of the permeable dam body are supported by left and right non-overflow dam bodies formed on the left and right sides in the direction of the width of the stream, The permeable section of the dam body is formed by integrating the base plate and the left and right non-overflow sections of the dam body, and the opening is formed by the base plate and the left and right non-overflow sections of the dam body. On the opening-side sides of the left and right non-overflow section of the dam body, there are grooved steel plates with vertically extending, concave-shaped grooves in plan view. In the grooves of the left and right door groove steel plates, the ends of the horizontal beams supported by the slide spacers are detachably fitted together, so that multiple horizontal beams are supported in multiple stages with vertical spacing via the slide spacers. On the front and rear inner surfaces of the groove in the door groove steel plate, slide rails are provided so as to extend vertically along the groove, facing each other from the front and rear. Slide angles are provided on the front and rear of the side surface of the slide spacer, extending in the vertical direction. A horizontal beam type permeable sediment control dam characterized in that the slide spacer is configured to slide vertically within the groove of the door groove steel plate together with the end of the horizontal beam, guided by a slide rail.

2. The horizontal beam type permeable sediment control dam according to claim 1, characterized in that the left and right non-overflow section dam bodies are formed to widen upward, and the groove portion of the door groove steel plate is formed up to the surface portion of the sleeve groove.

3. The horizontal beam type permeable sediment control dam according to claim 1 or 2, characterized in that the groove steel plate is a strip-shaped member extending in the vertical direction, and has a groove portion and a protruding portion and a folded portion extending in the front-rear direction from the opening edge of the groove portion, the protruding portion and the folded portion being L-shaped in plan view, and the protruding portion and the folded portion being fixed to the side surface of the non-overflow section dam body such that the surface of the protruding portion is exposed.

4. The slide spacer comprises a rectangular outer frame in plan view, consisting of front and rear side portions and left and right side portions; a support recess formed in the upper half of the outer frame; and the slide angle extending vertically on the rear side portion of the left and right side portions of the outer frame; the left and right side portions of the slide spacer each have rectangular through-holes opening upwards; and the support recess consists of a shelf plate and front and rear inner wall plates, and is provided so as to be located between the rectangular through-holes formed in the left and right side portions, characterized in that the horizontal beam type permeable sediment control dam according to claim 1 or 2.

5. A construction method for a transverse-beam type sediment control dam, comprising a permeable dam body with a base plate and non-overflow dam bodies on the left and right sides in the direction of the stream width, an opening and multiple transverse beams, During the construction of the left and right non-overflow sections of the dam body, grooved steel plates were fixed to the opening-side surfaces of the left and right non-overflow sections of the dam body, Slide spacers are detachably fitted into the grooves of the left and right door groove steel plates, and the ends of the horizontal beams are rested on the slide spacers to hold them in place. Multiple horizontal beams are installed in the opening in a vertical direction via slide spacers, in multiple stages with spacing between them. A method for constructing a horizontal beam type permeable sediment control dam, characterized in that when fitting and inserting a slide spacer into the groove of the aforementioned door groove steel plate, slide rails provided in the groove of the door groove steel plate so as to face each other from the front and back guide the slide angles provided on the front and rear of the side surface of the slide spacer.

6. The method for constructing a horizontal beam type permeable sediment control dam according to claim 5, characterized in that the groove steel plate is a strip-shaped member extending in the vertical direction, and has a groove portion, and a protruding portion and a folded portion extending front and rear from the opening edge of the groove portion, and when constructing the non-overflow portion dams on the left and right sides of the permeable portion dam body by pouring concrete, the groove steel plate is used as part of the formwork on the opening side, and the groove steel plate is left as residual formwork even after the concrete has been poured, and the protruding portion and the folded portion are fixed to the sides of the non-overflow portion dam body in front of and behind the groove portion.

7. A construction method for a horizontal beam type permeable sediment control dam according to claim 5 or 6, characterized in that the front and rear ends of two steel plates are bent so that they face each other to form front and rear side ends for each of the two steel plates, the facing ends of the front and rear side ends are welded together to form a rectangular outer frame in plan view, the upper half of the left and right side parts of the outer frame are cut out in a concave shape with a width and height that can receive and hold the ends of the horizontal beams, respectively, forming rectangular through-holes that open upwards, a support recess made of a shelf plate and front and rear inner wall plates is provided to be located between the rectangular through-holes formed on the left and right side parts, a slide angle is fixed to the rear side of the left and right side parts of the outer frame so as to extend vertically, thereby forming a slide spacer.

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