CN220521258U - Curved ladder water conservancy and hydropower overflow dam - Google Patents

Curved ladder water conservancy and hydropower overflow dam Download PDF

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CN220521258U
CN220521258U CN202320560558.XU CN202320560558U CN220521258U CN 220521258 U CN220521258 U CN 220521258U CN 202320560558 U CN202320560558 U CN 202320560558U CN 220521258 U CN220521258 U CN 220521258U
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dam
ladder
overflow
fixed block
flood
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孙涛
贡嘉淇
栾佳朋
陈海亮
郑航
王菲菲
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Zhengzhou University
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Zhengzhou University
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Abstract

The utility model discloses a curved ladder water conservancy and hydropower overflow dam, which relates to the technical field of overflow dams and comprises a dam body, wherein the dam body comprises a dam head, a dam slope and a dam tail, a diversion ladder is fixedly connected to the outer surface of the dam slope and comprises a first ladder and a second ladder, and circulation grooves are formed in the middle parts of the first ladder and the second ladder. According to the utility model, by adopting the cooperation of the first ladder, the second ladder and the circulation groove, flood passes through the top of the first ladder in the middle of a dam slope, the impact strength of partial flood discharge is reduced through the circulation groove arranged in the middle of the first ladder, and the slope of the first ladder flows in the middle of the second ladder again, so that the buffer of the flood discharge strength is carried out, the problem that the dam body is washed out and damaged or the flood leaks due to the fact that the kinetic energy of the existing curved water conservancy and hydropower overflow dam cannot be buffered when a large amount of flood needs to discharge is solved, and the effect of reducing the kinetic energy of the curved water conservancy and hydropower overflow dam in the flood discharge is achieved.

Description

一种曲型阶梯水利水电溢流坝A curved stepped water conservancy and hydropower overflow dam

技术领域Technical field

本实用新型涉及溢流坝技术领域,具体涉及一种曲型阶梯水利水电溢流坝。The utility model relates to the technical field of overflow dams, in particular to a curved stepped water conservancy and hydropower overflow dam.

背景技术Background technique

溢流坝,坝顶可泄洪的坝,亦称滚水坝。溢流坝一般由混凝土或浆砌石筑成。按坝型有溢流重力坝、溢流拱坝、溢流支墩坝和溢流土石坝。后者仅限于溢流面和坝脚有可靠防护设施、单宽流量比较小的低坝。和厂房结合在一起,作为泄洪建筑物的坝内式厂房溢流坝、厂房顶溢流和挑越厂房顶泄流的厂坝联合泄洪方式,可用在高山峡谷地区,是宣泄大流量时,解决溢洪道和电站厂房布置位置不足的一种途径,也是从溢流坝发展起来的新形式。而高度较高的坝体则采用曲形缓冲其泄洪的动能。针对现有技术存在以下问题:Overflow dam, a dam whose top can release floods, is also called a rolling dam. Overflow dams are generally made of concrete or mortar masonry. According to the dam type, there are overflow gravity dams, overflow arch dams, overflow buttress dams and overflow earth-rock dams. The latter is limited to low dams with reliable protection facilities on the overflow surface and dam foot and a small single-width flow rate. Combined with the factory building, the combined flood discharge method of the factory building overflow dam within the dam, the factory roof overflow and the overflow powerhouse roof release as a flood discharge structure can be used in high mountain and canyon areas to solve the problem when releasing large flows. One approach is the insufficient layout of spillways and power plant buildings, and it is also a new form developed from spill dams. The higher dam uses a curved shape to buffer the kinetic energy of its flood discharge. There are the following problems with existing technology:

现有的曲型水利水电溢流坝在遇到大量洪水需要泄洪时,通常由于无法缓冲泄洪时的动能,导致坝体被冲刷损坏或洪水外泄,同时,现有的曲型水利水电溢流坝在泄洪后的水源无法导流,导致无法及时被人们使用,使得大量水源浪费。When existing curved water conservancy and hydropower overflow dams encounter large amounts of flood and need to be discharged, they are usually unable to buffer the kinetic energy during flood discharge, causing the dam body to be washed away and damaged or floods to leak out. At the same time, the existing curved water conservancy and hydropower overflow dams The water source from the dam cannot be diverted after the flood is discharged, resulting in the inability to be used by people in time, resulting in a large amount of water wasted.

实用新型内容Utility model content

本实用新型提供一种曲型阶梯水利水电溢流坝,以解决上述背景技术中提出的问题。The utility model provides a curved stepped water conservancy and hydropower overflow dam to solve the problems raised in the above background technology.

为解决上述技术问题,本实用新型所采用的技术方案是:In order to solve the above technical problems, the technical solution adopted by the present utility model is:

一种曲型阶梯水利水电溢流坝,包括坝体,所述坝体包括有坝头、坝坡和坝尾,所述坝坡和坝尾的外部固定连接有护板,所述坝尾的顶部固定连接有分流盒,所述分流盒的一侧设置有引流块,所述坝坡的外表面固定连接有分流梯。A curved stepped water conservancy and hydropower overflow dam includes a dam body. The dam body includes a dam head, a dam slope and a dam tail. The dam slope and the dam tail are fixedly connected to the outside with protective plates. The dam tail is A diverter box is fixedly connected to the top, a diversion block is provided on one side of the diverter box, and a diverter ladder is fixedly connected to the outer surface of the dam slope.

本实用新型技术方案的进一步改进在于:所述分流梯包括有第一阶梯和第二阶梯,所述第一阶梯和第二阶梯的中部开设有流通槽。A further improvement of the technical solution of the present invention is that the diverter ladder includes a first step and a second step, and a flow groove is provided in the middle of the first step and the second step.

本实用新型技术方案的进一步改进在于:所述第一阶梯底部的一端固定连接在第二阶梯的顶部,所述第一阶梯和第二阶梯呈阶梯状。A further improvement of the technical solution of the present invention is that one end of the bottom of the first step is fixedly connected to the top of the second step, and the first step and the second step are stepped.

采用上述技术方案,该方案中的洪水通过坝头放下,经过坝坡中部的第一阶梯顶部,通过第一阶梯中部开设的流通槽消减部分泄洪冲击强度,再次通过第一阶梯的斜面流在第二阶梯中部,从而进行泄洪强度的缓冲。Using the above technical solution, the floodwater in this solution is released through the dam head, passes through the top of the first step in the middle of the dam slope, reduces part of the flood discharge impact intensity through the flow channel opened in the middle of the first step, and flows again through the slope of the first step to the third step. The middle part of the second step is used to buffer the flood discharge intensity.

本实用新型技术方案的进一步改进在于:所述引流块包括有第一引流板和第二引流板,所述第一引流板和第二引流板组合呈三棱状,所述第一引流板和第二引流板的一侧固定连接在分流盒的一侧。A further improvement of the technical solution of the present invention is that: the drainage block includes a first drainage plate and a second drainage plate, the combination of the first drainage plate and the second drainage plate is in a triangular shape, and the first drainage plate and One side of the second drainage plate is fixedly connected to one side of the distribution box.

采用上述技术方案,该方案中的第一引流板和第二引流板通过组合呈三棱状,可以将流在坝尾的洪水引流至分流盒中,通过从分流盒一侧截取水源达到灌溉等水源使用。Using the above technical solution, the first diversion plate and the second diversion plate in the plan are combined into a triangular shape, which can divert the flood flowing at the end of the dam to the diverter box, and intercept the water source from one side of the diverter box for irrigation, etc. Water use.

本实用新型技术方案的进一步改进在于:所述第一引流板和第二引流板的一侧固定连接有第一固定块,所述分流盒的一侧开设有限位槽,所述限位槽的内部固定连接有第二固定块,所述第二固定块和第一固定块的中部活动连接有限位柱。A further improvement of the technical solution of the present invention is that a first fixing block is fixedly connected to one side of the first and second flow guide plates, and a limit slot is provided on one side of the diverter box, and the limit slot is A second fixed block is fixedly connected to the interior, and the middle portions of the second fixed block and the first fixed block are movably connected to a limiting column.

采用上述技术方案,该方案中的洪水推动第一引流板和第二引流板活动时,使限位柱活动在第一固定块和限位槽内部的第二固定块中部,从而达到缓冲限位的作用。Using the above technical solution, when the flood in this solution pushes the first and second diversion plates to move, the limit column moves in the middle of the first fixed block and the second fixed block inside the limit groove, thereby achieving the buffer limit. role.

本实用新型技术方案的进一步改进在于:所述限位柱的外部设置有弹簧,所述弹簧的两端搭接在第一固定块和第二固定块的内侧。A further improvement of the technical solution of the present invention is that a spring is provided on the outside of the limiting column, and the two ends of the spring overlap the insides of the first fixed block and the second fixed block.

采用上述技术方案,该方案中的限位柱在活动在第一固定块和第二固定块中部时,限位柱外部的弹簧通过搭接第一固定块和第二固定块,从而得到减震缓冲的作用。Using the above technical solution, when the limiting column in this solution moves in the middle of the first fixed block and the second fixed block, the spring outside the limiting column overlaps the first fixed block and the second fixed block, thereby achieving shock absorption. buffering effect.

由于采用了上述技术方案,本实用新型相对现有技术来说,取得的技术进步是:Due to the adoption of the above technical solution, compared with the existing technology, the technical progress achieved by this utility model is:

1、本实用新型提供一种曲型阶梯水利水电溢流坝,采用第一阶梯、第二阶梯和流通槽的配合,洪水通过坝头放下,经过坝坡中部的第一阶梯顶部,通过第一阶梯中部开设的流通槽消减部分泄洪冲击强度,再次通过第一阶梯的斜面流在第二阶梯中部,从而进行泄洪强度的缓冲,解决了现有的曲型水利水电溢流坝在遇到大量洪水需要泄洪时,通常由于无法缓冲泄洪时的动能,导致坝体被冲刷损坏或洪水外泄的问题,达到此曲型阶梯水利水电溢流坝具有减少泄洪时的动能的效果。1. This utility model provides a curved stepped water conservancy and hydropower overflow dam, which adopts the cooperation of the first step, the second step and the flow channel. The flood water is released through the dam head, passes through the top of the first step in the middle of the dam slope, and passes through the first step. The flow channel opened in the middle of the steps reduces part of the flood discharge impact intensity, and flows again through the slope of the first step in the middle of the second step, thus buffering the flood discharge intensity and solving the problem of existing curved water conservancy and hydropower overflow dams when encountering large amounts of floods. When flood discharge is required, the dam body is usually damaged by erosion or flood leakage due to the inability to buffer the kinetic energy during flood discharge. This curved stepped water conservancy and hydropower overflow dam has the effect of reducing the kinetic energy during flood discharge.

2、本实用新型提供一种曲型阶梯水利水电溢流坝,采用分流盒、第一引流板、第二引流板、第一固定块、限位槽、第二固定块、限位柱和弹簧的配合,洪水推动第一引流板和第二引流板活动时,使限位柱活动在第一固定块和限位槽内部的第二固定块中部,从而达到缓冲限位的作用,限位柱在活动在第一固定块和第二固定块中部时,限位柱外部的弹簧通过搭接第一固定块和第二固定块,从而得到减震缓冲的作用,解决了现有的曲型水利水电溢流坝在泄洪后的水源无法导流,导致无法及时被人们使用,使得大量水源浪费的问题,达到此曲型阶梯水利水电溢流坝具有方便泄洪分流,方便人们使用水源的效果。2. The utility model provides a curved stepped water conservancy and hydropower overflow dam, which adopts a diverter box, a first diversion plate, a second diversion plate, a first fixed block, a limit groove, a second fixed block, a limit column and a spring. With the cooperation, when the flood drives the first and second diversion plates to move, the limiting column moves in the middle of the first fixed block and the second fixed block inside the limiting groove, thereby achieving the buffering and limiting function. The limiting column When moving in the middle of the first fixed block and the second fixed block, the spring outside the limiting column overlaps the first fixed block and the second fixed block, thereby obtaining a shock-absorbing and buffering effect, solving the problem of existing curved water conservancy projects. The water source of the hydropower overflow dam cannot be diverted after the flood is discharged, resulting in the inability to be used by people in time, resulting in the problem of wasting a large amount of water. The curved stepped water conservancy and hydropower overflow dam has the effect of convenient flood discharge and diversion, making it convenient for people to use water sources.

附图说明Description of drawings

图1为本实用新型的结构示意图;Figure 1 is a schematic structural diagram of the utility model;

图2为本实用新型的分流梯局部剖面结构示意图;Figure 2 is a partial cross-sectional structural diagram of the diverter ladder of the present utility model;

图3为本实用新型的引流块结构示意图;Figure 3 is a schematic structural diagram of the drainage block of the present utility model;

图4为本实用新型的引流块剖面结构示意图。Figure 4 is a schematic cross-sectional structural diagram of the drainage block of the present utility model.

图中:1、坝体;2、坝头;3、坝坡;4、坝尾;5、护板;6、分流盒;7、分流梯;8、引流块;71、第一阶梯;72、第二阶梯;73、流通槽;81、第一引流板;82、第二引流板;83、第一固定块;84、限位槽;85、第二固定块;86、限位柱;87、弹簧。In the picture: 1. Dam body; 2. Dam head; 3. Dam slope; 4. Dam tail; 5. Guard plate; 6. Diversion box; 7. Diversion ladder; 8. Diversion block; 71. First ladder; 72 , the second ladder; 73, flow channel; 81, first drainage plate; 82, second drainage plate; 83, first fixed block; 84, limit slot; 85, second fixed block; 86, limit column; 87. Spring.

具体实施方式Detailed ways

下面结合实施例对本实用新型做进一步详细说明:The utility model will be further described in detail below in conjunction with the examples:

实施例1Example 1

如图1-4所示,本实用新型提供了一种曲型阶梯水利水电溢流坝,包括坝体1,坝体1包括有坝头2、坝坡3和坝尾4,坝坡3和坝尾4的外部固定连接有护板5,坝尾4的顶部固定连接有分流盒6,分流盒6的一侧设置有引流块8,坝坡3的外表面固定连接有分流梯7,分流梯7包括有第一阶梯71和第二阶梯72,第一阶梯71和第二阶梯72的中部开设有流通槽73,第一阶梯71底部的一端固定连接在第二阶梯72的顶部,第一阶梯71和第二阶梯72呈阶梯状。As shown in Figures 1-4, the utility model provides a curved stepped water conservancy and hydropower overflow dam, which includes a dam body 1. The dam body 1 includes a dam head 2, a dam slope 3 and a dam tail 4. The dam slope 3 and A guard plate 5 is fixedly connected to the outside of the dam tail 4. A diverter box 6 is fixedly connected to the top of the dam tail 4. A diversion block 8 is provided on one side of the diverter box 6. A diverter ladder 7 is fixedly connected to the outer surface of the dam slope 3 to divert the flow. The ladder 7 includes a first step 71 and a second step 72. A circulation groove 73 is provided in the middle of the first step 71 and the second step 72. One end of the bottom of the first step 71 is fixedly connected to the top of the second step 72. The step 71 and the second step 72 are in the shape of steps.

在本实施例中,洪水通过坝头2放下,经过坝坡3中部的第一阶梯71顶部,通过第一阶梯71中部开设的流通槽73消减部分泄洪冲击强度,再次通过第一阶梯71的斜面流在第二阶梯72中部,从而进行泄洪强度的缓冲,解决了现有的曲型水利水电溢流坝在遇到大量洪水需要泄洪时,通常由于无法缓冲泄洪时的动能,导致坝体1被冲刷损坏或洪水外泄的问题,达到此曲型阶梯水利水电溢流坝具有减少泄洪时的动能的效果。In this embodiment, the floodwater is released through the dam head 2, passes through the top of the first step 71 in the middle of the dam slope 3, passes through the flow channel 73 opened in the middle of the first step 71 to reduce part of the flood discharge impact intensity, and then passes through the slope of the first step 71 again. The flow flows in the middle of the second step 72, thereby buffering the intensity of the flood discharge, which solves the problem that when the existing curved water conservancy and hydropower overflow dam encounters a large amount of flood and needs to discharge the flood, the dam body 1 is usually unable to buffer the kinetic energy during the flood discharge, causing the dam body 1 to be To solve the problem of erosion damage or flood leakage, this curved stepped water conservancy and hydropower overflow dam has the effect of reducing the kinetic energy during flood discharge.

实施例2Example 2

如图1-4所示,在实施例1的基础上,本实用新型提供一种技术方案:优选的,引流块8包括有第一引流板81和第二引流板82,第一引流板81和第二引流板82组合呈三棱状,第一引流板81和第二引流板82的一侧固定连接在分流盒6的一侧,第一引流板81和第二引流板82的一侧固定连接有第一固定块83,分流盒6的一侧开设有限位槽84,限位槽84的内部固定连接有第二固定块85,第二固定块85和第一固定块83的中部活动连接有限位柱86,限位柱86的外部设置有弹簧87,弹簧87的两端搭接在第一固定块83和第二固定块85的内侧。As shown in Figures 1-4, based on Embodiment 1, the present utility model provides a technical solution: preferably, the drainage block 8 includes a first drainage plate 81 and a second drainage plate 82. The first drainage plate 81 Combined with the second air guide plate 82, it forms a triangular shape. One side of the first air guide plate 81 and the second air guide plate 82 is fixedly connected to one side of the distribution box 6. One side of the first air guide plate 81 and the second air guide plate 82 A first fixed block 83 is fixedly connected. A limiting slot 84 is provided on one side of the diverter box 6. A second fixed block 85 is fixedly connected to the inside of the limiting slot 84. The middle portions of the second fixed block 85 and the first fixed block 83 are movable. Connected to the limiting column 86, a spring 87 is provided on the outside of the limiting column 86, and both ends of the spring 87 overlap the insides of the first fixed block 83 and the second fixed block 85.

在本实施例中,洪水推动第一引流板81和第二引流板82活动时,使限位柱86活动在第一固定块83和限位槽84内部的第二固定块85中部,从而达到缓冲限位的作用,限位柱86在活动在第一固定块83和第二固定块85中部时,限位柱86外部的弹簧87通过搭接第一固定块83和第二固定块85,从而得到减震缓冲的作用,解决了现有的曲型水利水电溢流坝在泄洪后的水源无法导流,导致无法及时被人们使用,使得大量水源浪费的问题,达到此曲型阶梯水利水电溢流坝具有方便泄洪分流,方便人们使用水源的效果。In this embodiment, when the flood pushes the first diversion plate 81 and the second diversion plate 82 to move, the limiting column 86 moves in the middle of the second fixed block 85 inside the first fixed block 83 and the limiting groove 84, thereby achieving To buffer the limit, when the limit column 86 moves in the middle of the first fixed block 83 and the second fixed block 85, the spring 87 outside the limit column 86 overlaps the first fixed block 83 and the second fixed block 85, This achieves the function of shock absorption and buffering, and solves the problem of the existing curved water conservancy and hydropower overflow dam that the water source cannot be diverted after the flood is discharged, resulting in the inability to be used by people in time, resulting in a large amount of water wastage. This curved stepped water conservancy and hydropower The overflow dam has the effect of facilitating flood discharge and diversion and making it easier for people to use water sources.

下面具体说一下该曲型阶梯水利水电溢流坝的工作原理。Let’s talk about the working principle of this curved stepped water conservancy and hydropower overflow dam in detail.

如图1-4所示,在使用此曲型阶梯水利水电溢流坝时,将护板5安装在坝坡3和坝尾4外部,将分流盒6安装在坝尾4顶部,将引流块8设置在分流盒6的一侧,将洪水通过坝头2放下,经过坝坡3中部的第一阶梯71顶部,通过第一阶梯71中部开设的流通槽73消减部分泄洪冲击强度,再次通过第一阶梯71的斜面流在第二阶梯72中部,从而进行泄洪强度的缓冲,解决了现有的曲型水利水电溢流坝在遇到大量洪水需要泄洪时,通常由于无法缓冲泄洪时的动能,导致坝体1被冲刷损坏或洪水外泄的问题,达到此曲型阶梯水利水电溢流坝具有减少泄洪时的动能的效果,与此同时,洪水推动第一引流板81和第二引流板82活动时,使限位柱86活动在第一固定块83和限位槽84内部的第二固定块85中部,从而达到缓冲限位的作用,限位柱86在活动在第一固定块83和第二固定块85中部时,限位柱86外部的弹簧87通过搭接第一固定块83和第二固定块85,从而得到减震缓冲的作用,解决了现有的曲型水利水电溢流坝在泄洪后的水源无法导流,导致无法及时被人们使用,使得大量水源浪费的问题,达到此曲型阶梯水利水电溢流坝具有方便泄洪分流,方便人们使用水源的效果。As shown in Figure 1-4, when using this curved stepped water conservancy and hydropower overflow dam, install the guard plate 5 outside the dam slope 3 and the dam tail 4, install the diverter box 6 on the top of the dam tail 4, and install the diversion block 8 is arranged on one side of the diverter box 6, and the flood water is released through the dam head 2, passes through the top of the first step 71 in the middle of the dam slope 3, and reduces part of the flood discharge impact intensity through the flow groove 73 opened in the middle of the first step 71, and then passes through the third step again. The slope of the first step 71 flows in the middle of the second step 72, thereby buffering the intensity of flood discharge, which solves the problem that when existing curved water conservancy and hydropower overflow dams encounter a large amount of flood and need to discharge flood, they usually cannot buffer the kinetic energy during flood discharge. The curved stepped water conservancy and hydropower overflow dam has the effect of reducing the kinetic energy during flood discharge, which causes the dam body 1 to be damaged by erosion or flood leakage. At the same time, the flood pushes the first diversion plate 81 and the second diversion plate 82 When moving, the limiting column 86 moves in the middle of the second fixed block 85 inside the first fixed block 83 and the limiting groove 84, thereby achieving the function of buffering and limiting. The limiting column 86 moves between the first fixed block 83 and the limiting groove 84. When the second fixed block 85 is in the middle, the spring 87 outside the limiting column 86 overlaps the first fixed block 83 and the second fixed block 85, thereby obtaining a shock-absorbing and buffering effect, and solving the existing curved water conservancy and hydropower overflow problem. The water source of the dam cannot be diverted after the flood is discharged, resulting in the inability to be used by people in time, resulting in the problem of wasting a large amount of water sources. This curved stepped water conservancy and hydropower overflow dam has the effect of convenient flood discharge and diversion, making it convenient for people to use water sources.

上文一般性的对本实用新型做了详尽的描述,但在本实用新型基础上,可以对之做一些修改或改进,这对于技术领域的一般技术人员是显而易见的。因此,在不脱离本实用新型思想精神的修改或改进,均在本实用新型的保护范围之内。The above generally describes the present utility model in detail, but on the basis of the present utility model, some modifications or improvements can be made, which is obvious to those of ordinary skill in the technical field. Therefore, any modification or improvement that does not deviate from the spirit of the present utility model is within the protection scope of the present utility model.

Claims (6)

1. The utility model provides a curved ladder water conservancy hydroelectric overflow dam, includes dam body (1), its characterized in that: the dam body (1) comprises a dam head (2), a dam slope (3) and a dam tail (4), wherein guard plates (5) are fixedly connected to the outside of the dam slope (3) and the dam tail (4), a shunt box (6) is fixedly connected to the top of the dam tail (4), a drainage block (8) is arranged on one side of the shunt box (6), and a shunt ladder (7) is fixedly connected to the outer surface of the dam slope (3).
2. The curved stepped hydraulic and hydroelectric overflow dam of claim 1, wherein: the diversion ladder (7) comprises a first ladder (71) and a second ladder (72), and a circulation groove (73) is formed in the middle of the first ladder (71) and the middle of the second ladder (72).
3. The curved stepped hydraulic and hydroelectric overflow dam of claim 2, wherein: one end of the bottom of the first ladder (71) is fixedly connected to the top of the second ladder (72), and the first ladder (71) and the second ladder (72) are in a ladder shape.
4. The curved stepped hydraulic and hydroelectric overflow dam of claim 1, wherein: the drainage block (8) comprises a first drainage plate (81) and a second drainage plate (82), the first drainage plate (81) and the second drainage plate (82) are combined to form a triangular shape, and one side of the first drainage plate (81) and one side of the second drainage plate (82) are fixedly connected to one side of the shunt box (6).
5. The curved stepped hydraulic and hydroelectric overflow dam of claim 4, wherein: one side fixedly connected with first fixed block (83) of first drainage board (81) and second drainage board (82), spacing groove (84) has been seted up to one side of reposition of redundant personnel box (6), the inside fixedly connected with second fixed block (85) of spacing groove (84), the middle part swing joint of second fixed block (85) and first fixed block (83) has spacing post (86).
6. The curved stepped hydraulic and hydroelectric overflow dam of claim 5, wherein: the outside of spacing post (86) is provided with spring (87), the both ends overlap joint of spring (87) is in the inboard of first fixed block (83) and second fixed block (85).
CN202320560558.XU 2023-03-21 2023-03-21 Curved ladder water conservancy and hydropower overflow dam Active CN220521258U (en)

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