JPS6227534Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvement of steel dams.

Most conventional steel dams have a dam frame built on a concrete foundation. Incidentally, the location where the steel dam is installed is located on steep terrain upstream of a river, and the weather conditions may be severe depending on the season in which the dam is constructed. Therefore, the placement of foundation concrete is subject to restrictions due to topographical and weather conditions, and must be avoided from the standpoint of concrete quality control.

In addition, in the steel dam, because the pitch of the screen material stretched in front of the dam frame is dense, pebbles and gravel accumulate upstream of the dam, and as a result, even relatively small-grained earth and sand are deposited. As a result, an impermeable layer is more likely to be formed, and once an impermeable layer is formed, it becomes impossible for running water to penetrate into the ground, making it impossible to reduce the flow rate of surface runoff water.

In addition, since conventional steel dams have a λ-shaped side cross section and have an overhang at the top, boulders often collide with the overhang and cause the overhang to break.

The present invention was made to solve this problem, and instead of placing concrete foundations, we created a dam with a triangular side cross section, which is based on a steel box frame and has a permeable wall material with a front slope on top of the steel box frame. The purpose is to provide a steel dam with a frame.

An embodiment of the steel dam according to the present invention will be described below with reference to the drawings. In Figure 1, 1 is a steel box frame,
The four pillars 2 at the front, rear, right and left corners are rigidly connected to four beams 3 at the front, rear, top and bottom, and four horizontal beams 4 at the left, right and top, through connecting plates 5. Also, the left and right upper and lower horizontal beams 4
An auxiliary column 6 is erected and connected to the upstream side of the gap, and a reinforcing diagonal member 7 is connected to the auxiliary column 6 between the upper and lower horizontal beams 4.
A bracket 8 is connected between the front and rear surfaces of the lower end and the lower side of the upper horizontal beam 4 and between the lower side of the upper horizontal beam 4 and the upper side of the lower horizontal beam 4.
A screen material 9 is vertically stretched and connected between the front and rear upper and lower beams 3 at a constant interval in the left and right direction, and a screen material 9 is stretched and connected vertically between the left and right lower horizontal beams 4 at a constant interval in the front and rear direction. is stretched horizontally. A dam frame 10 having a triangular side cross section and an inclined front is provided on the steel box frame 1. That is, on the upper horizontal beam 4 of the steel box frame 1, the permeable wall material 11 of the dam is inclined, and its lower end is rigidly connected to the upper surface of the horizontal beam 4 on which the auxiliary column 6 is located. The upper end is rigidly connected to the upper end of a vertical support member 12 that is connected to the rear end of the steel box frame 1 and stands between the middle of the left and right rear surfaces of the wall material 11 and the rear end of the upper horizontal beam 4. A diagonal member 14 is strung together via a bracket 13. As shown in the figure, the wall material 11 is constructed by stretching and fixing screen materials 16 in parallel in the vertical direction between inclined frame columns 15 on both the left and right sides. The support member 12 is constructed by horizontally connecting a beam 18 between the upper ends of the support columns 17 connected to the upper side of the columns 2 on both the left and right sides of the rear end of the steel box frame 1 via the connecting plate 5. Pillar 1
The diagonal members 20 are strung and connected by crossing them through brackets 19 above and below the gap between them.

In this embodiment, the columns 2, beams 3, horizontal beams 4, and auxiliary columns 6 that make up the steel box frame 1 are made of H-beams, the reinforcing diagonal members 7 are made of L-beams, and the screen material 9 Although it is made of a flat bar and an L-shaped member, it is not limited thereto and may be replaced with other structural members. Furthermore, the frame columns 15 and screen materials 16 that constitute the dam wall material 11 and the support columns 17 and beams 18 that constitute the support materials 12 are made of square steel pipes, and the diagonal members 14 and 20 are made of L-shaped members. but,
The structure is not limited to this, and may be replaced with other structural members. Furthermore, the means for connecting the respective structural members are not limited to the means shown in the drawings, and may be replaced by other means.

However, the steel dam of the present invention is constructed by excavating a bed at a pre-selected location in the valley bed 21 upstream of the river, as shown in FIGS. 2 to 5, and then assembling it there. That is, structural members brought to the site will be assembled and a steel dam will be built continuously and integrally in the direction of the valley. Then, using the box frame 1 at the bottom of this steel dam as a base, stones 22 of a size that does not pass through the screen material 9 are filled inside to stabilize it, and the excavated floor portions at the front and rear of the box frame 1 are backfilled.

Due to the construction of such a steel dam, as shown in FIG.
6, the outflow is prevented, and sediment and gravel are gradually deposited upstream, preserving the foothills of the mountain slopes on both banks, and the gradient of the stream is eased, reducing the flow velocity and preventing erosion of the stream bed. be done. A part of the running water and fine earth and sand penetrate into the sediment layer 23 of earth, sand and gravel, pass between large grain stones, pass through the screen material 16 of the dam wall material 11, and flow down into the box frame 1. do.
The running water and fine earth and sand that have fallen into this box frame 1 are
Only the flowing water penetrated between the stones 22 filled inside the box frame 1, and together with the flowing water that flowed in through the screen material 9 on the front side of the box frame 1, the bottom and rear screen materials 9 were used to remove the underground and backfill portions of the excavated floor. The water seeps into the water, expands the water, and gradually flows downstream.

In this way, the flow rate of surface runoff water from the gorge is significantly reduced, which prevents the outflow of earth and sand and reduces erosion. In addition, the dam frame 10 has a rigid structure with a triangular side cross section, so even if a boulder collides with it, it will not break like a conventional steel dam with a λ-shaped side cross section, and can reliably stop the boulders. .

As can be seen from the above explanation, the steel dam according to the present invention is constructed by providing a dam frame with a triangular side cross section and a permeable wall material with an inclined front on a steel box frame. There is no need to cast foundation concrete like in a manufactured dam, and the structural members transported to the site are assembled in the excavated part of the ravine floor into a steel box frame at the bottom of the steel dam, and the screen material on the front, back, and bottom is transparent. Because a stable foundation for a steel dam can be obtained simply by filling it with stones of a size that is not large, it has excellent workability and construction of a steel dam can be carried out quickly and easily. In addition, according to the steel dam of the present invention, running water that passes through the screen material on the sloped front of the dam frame on the steel box frame flows down into the steel box frame at the bottom, and passes through between the filled stones. Since the water is discharged into the ground through the bottom and rear screen materials and expanded, the flow rate of surface runoff downstream can be significantly reduced and the base flow can be recharged, especially during floods. This effect becomes noticeable during times of high water and high water levels, suppressing the outflow of earth and sand and erosion of the valley floor.

Furthermore, since the steel dam of the present invention has a rigid upper dam frame with a triangular side cross section, it can reliably catch boulders and prevent damage.

[Brief explanation of the drawing]

Figure 1 is a partially assembled perspective view of the steel dam of the present invention;
Figure 2 is a side cross-sectional view showing the assembled construction in the dugout part of the valley floor, Figure 3 is a view taken along the line A-A in Figure 2, and Figure 4 is a view taken along the line B-B in Figure 2. The perspective view, FIG. 5, is a view taken along the line C--C in FIG. 2. 1... Steel box frame, 2... Support, 3... Beam, 4... Horizontal beam, 5... Connecting plate, 6... Auxiliary column, 7... Reinforcement diagonal material,
8... Bracket, 9... Screen material, 10... Embankment frame, 11... Permeable wall material, 12... Supporting material,
13... Bracket, 14... Diagonal member, 15... Frame column, 1
6...Screen material, 17...Support column, 18...Beam, 1
9... Bracket, 20... Diagonal material, 21... Valley floor, 22
...stone, 23...sedimentary layer.

Claims (1)

[Scope of utility model registration request] The four pillars at the front, rear, left, and right corners are connected by four beams at the front, top, and bottom, and four horizontal beams at the left, right, top, and bottom, and are based on a steel box frame with screen material stretched on the front, rear, and bottom surfaces. The lower end of a transparent wall material with a front slope, which is made by stretching a screen material on the frame columns, is connected and fixed to the upper surface of the pair of upper horizontal beams of the steel box frame, and the upper end of the wall material and the steel A steel dam characterized in that a dam frame with a triangular side cross section is formed on a steel box frame by connecting the rear support of the box frame with a vertical support column.