Construction method of ecological riverway short dam

Abstract

The invention discloses a construction method of an ecological riverway short dam. The construction method comprises the following steps: a, preparation before construction; b, longitudinal straw bag cofferdam construction; c, a dam foundation is excavated and treated; d, dam body installation; and e, construction is completed. By arranging the concrete bottom plate and the mounting groove, the unification and the stability of the mounting reference of the dam body are realized; and in cooperation with cooperative operation of the driving assembly and the positioning and supporting mechanism, precise alignment and reliable clamping can be conducted on the prefabricated dam body in the installation process, and the problem that the dam body inclines due to the uneven river bank terrain is effectively solved. According to the method, the mounting precision and efficiency of the split dam body are remarkably improved, the overall stability and sealing performance of the short dam structure are ensured, meanwhile, dependence on large hoisting equipment is reduced, and the construction difficulty and safety risk under the complex terrain are reduced.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy technology, specifically relating to a construction method for an ecological river channel low dam. Background Technology

[0002] With the in-depth implementation of the national rural revitalization strategy and the concept of integrated management of mountains, rivers, forests, fields, lakes and grasslands, comprehensive management of small watersheds in mountainous areas has become a key link in improving regional water security and restoring river ecological corridors. As a core project in ecological river management for regulating water flow, stabilizing the riverbed and preventing erosion, and creating an ecological environment, the structure and construction technology of low dams directly affect the management effectiveness.

[0003] However, in actual construction, the installation process of the dam often faces severe challenges. Due to the complex riverbank topography, it is difficult to ensure the verticality and horizontality of the precast dam body during hoisting and positioning, making it prone to tilting. This tilting problem during installation not only affects the splicing accuracy between adjacent dam sections, leading to uneven joints and poor sealing, but also causes poor contact between the bottom of the dam body and the foundation, forming local suspended areas. This not only weakens the overall structural stability of the low dam but also affects its resistance to water flow impact. At the same time, tilted dam bodies often require repeated adjustments and re-hoisting, significantly prolonging the installation period and increasing construction costs and safety risks. Summary of the Invention

[0004] The purpose of this invention is to solve the aforementioned technical problems existing in the prior art and to provide a construction method for ecological river channel low dams. By setting a concrete base plate and installation groove, the installation benchmark of the dam body is unified and stable. With the coordinated operation of the drive component and positioning support mechanism, the prefabricated dam body can be accurately aligned and reliably clamped during the installation process, effectively overcoming the problem of dam body tilting caused by uneven riverbank terrain. This method significantly improves the installation accuracy and efficiency of split dam bodies, ensures the overall stability and sealing of the low dam structure, and reduces the dependence on large hoisting equipment, thereby reducing the construction difficulty and safety risks in complex terrain.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A construction method for an ecological river channel low dam includes the following steps: a. Pre-construction preparation Before construction, the river dam site area was cleared, removing miscellaneous trees, weeds, garbage and loose soil from the surface, and the area was measured and laid out. b. Longitudinal straw bag cofferdam The dam body under construction was divided into sections and marked. Along the river channel, earthen bags with a top width of 2.0m and a height of 1.5m were built to form a sectioned cofferdam according to the markings. c. Dam foundation excavation and treatment Excavators were used to excavate at the construction site of the dam foundation, and manual trimming was carried out in conjunction with the excavation. After the excavation reached the design elevation, the dam foundation surface was compacted or tamped to ensure that the bearing capacity of the foundation met the design requirements. d. Dam installation 1) Concrete base slab pouring After the dam foundation has passed inspection, a concrete base slab is poured, and an installation groove for fixing the dam body is poured on the base slab. 2) Dam body splicing After the concrete base slab is cured, a fixed drive assembly is installed on both sides of the installation slot. A positioning support mechanism is movably connected to the drive assembly. The prefabricated segmented dam body is hoisted into the installation slot by hoisting equipment. The positioning support mechanism limits the dam body in the installation slot. Then, two adjacent dam bodies are connected by splicing parts. 3) Segmented casting After the current dam segment is spliced ​​into the installation slot, the drive components and positioning support mechanism are removed, and then the template is installed along both sides of the installation slot for pouring and fixing. e. Complete construction Repeat steps b through d above to complete the construction of the low dam.

[0006] Furthermore, splicing blocks are provided on both sides of the dam body, and splicing frames are provided on the splicing components. Splicing slots are provided on both sides of the splicing frames corresponding to the splicing blocks. The splicing blocks of two adjacent dam bodies are respectively inserted into the splicing slots on both sides of the splicing frames.

[0007] By interlocking the prefabricated dam body side panels with the splicing slots on the independent splicing frame, rapid and precise positioning and mechanical connection between adjacent dam bodies are achieved. This not only significantly improves on-site splicing efficiency and assembly accuracy, ensuring the straightness of the dam body's shape, but also enhances the overall structural stability and impact resistance by transferring and dispersing the load between adjacent dam bodies through the splicing frame. As independent components, the splice parts are easy to standardize production and installation, reducing construction complexity, while also providing convenience for possible subsequent partial replacements or repairs.

[0008] Furthermore, in step b, the water-facing side of the straw bag cofferdam is covered with waterproof tarpaulin and compacted with bagged soil.

[0009] By actively covering and compacting the water-facing side of the traditional earthen bag cofferdam, a continuous seepage barrier is effectively constructed. This significantly enhances the seepage prevention performance of the cofferdam, greatly reducing the amount of river water seeping into the construction area through the gaps in the earthen bags. This provides a drier and more stable working environment for subsequent processes such as dam foundation excavation and concrete pouring. It also ensures construction quality, avoids foundation softening or reduced concrete pouring quality due to seepage, reduces the drainage burden of the foundation pit, and improves construction efficiency and safety.

[0010] Furthermore, step d also includes fixing the culture tank. After the dam body is assembled, the bottom of the culture tank is fixedly connected to the top of the two adjacent dam bodies using fasteners.

[0011] The cultivation troughs for planting aquatic plants are integrated and fixed to the top of the dam; this directly combines ecological functional components with structural components, realizing the immediate ecologicalization of the low dam without the need for secondary modification; the fixed connection ensures the stability of the cultivation troughs under the impact of river water flow, preventing them from shifting or overturning; at the same time, it increases the connection stability between two adjacent dam bodies.

[0012] Furthermore, the dam body is provided with ecological flow holes, and the bottom of the cultivation tank is provided with limiting grooves on both sides. The fixing components include a U-shaped clamping frame, a tightening screw and a tightening block. The top of the U-shaped clamping frame is provided with a limiting part, and the bottom of the U-shaped clamping frame is provided with an installation part. The limiting part is clamped in the limiting groove. The U-shaped clamping frame is set in the ecological flow holes. The tightening screw is movably connected to the installation part. The top of the tightening screw is fixedly connected to the tightening block. The tightening block is tightened against the top of the ecological flow holes, so that the cultivation tank is fixedly connected to the top of the two adjacent dam bodies.

[0013] By utilizing the inherent ecological flow holes of the dam body as the operating and force-bearing space, rapid and powerful locking without the need for pre-embedded parts is achieved. The U-shaped clamping frame achieves initial positioning and prevents lateral movement through the cooperation of the limiting part with the limiting groove of the cultivation tank. The rotating tightening screw drives the tightening block to press against the top wall of the flow hole, thereby generating a strong vertical clamping force to firmly anchor the cultivation tank to the dam body. This method is convenient to install and disassemble, has reliable connection, can effectively resist water flow erosion and buoyancy, and does not damage the structural integrity of the dam body.

[0014] Furthermore, the drive assembly includes a base one, a base two, ball screws, a drive box, and a screw motor. Base one is located on the edge of the mounting groove on the side away from the river channel, and base two is located on the edge of the mounting groove on the side closer to the river channel. Both base one and base two are rotatably connected to ball screws. The ends of base one and base two are fixedly connected to one side of the drive box. The ends of the ball screws are connected to transmission wheels, which are located inside the drive box. The screw motor is fixedly connected to the other side of the drive box. The output end of the screw motor is connected to a drive wheel, which is located inside the drive box. A transmission belt connects the drive wheel and the transmission wheel. The drive motor controls the rotation of the two ball screws, and the ball screws are movably connected to a positioning support mechanism.

[0015] A single lead screw motor drives the ball screws on both sides to rotate synchronously via the transmission wheel, drive wheel and transmission belt in the drive box, ensuring that the positioning support mechanism installed on the lead screws on both sides can achieve strictly synchronous movement.

[0016] Furthermore, the positioning support mechanism includes a positioning component and a support component. The positioning component is movably connected to a ball screw located in the second base, and the support component is movably connected to a ball screw located in the second base. The positioning component abuts against one side of the dam body, and the support component supports the other side of the dam body.

[0017] The drive components control the dam to work together on both sides of the mounting slot; the positioning components mainly provide precise lateral positioning and limiting to ensure the accurate planar position of the dam body in the mounting slot; the support components mainly provide stable vertical and lateral support to resist the dam body's own weight and possible lateral forces, preventing it from tipping over. This division of labor and cooperation mode of "positioning on one side and supporting on the other side" allows the hoisted dam body to be quickly and stably temporarily fixed in the preset position, creating safe and precise conditions for subsequent splicing operations.

[0018] Furthermore, the positioning assembly includes a slider, a base, a column, and a positioning block. The bottom of the base is fixedly connected to the slider, which is movably connected to a ball screw located in the base. The bottom of the column is fixedly connected to the base, and the top of the column is movably connected to an adjusting screw. The end of the adjusting screw is fixedly connected to a positioning block, which rests against the dam body. Adjusting nuts are screwed into both ends of the adjusting screw and tightened onto the column.

[0019] By rotating the adjusting screw, the extension length of the positioning block relative to the column can be finely adjusted, thereby precisely adjusting its clamping force on the dam body and the precise positioning point position; the adjusting nut is used to lock the adjusting screw to ensure stable positioning; ensuring that each dam body can be precisely clamped and fixed in the design position, guaranteeing the straightness and flatness of the entire dam body axis.

[0020] Furthermore, the support assembly includes a support platform and a diagonal brace assembly. The bottom of the support platform is fixedly connected to a slider two, which is movably connected to a ball screw located in the base one. A support column is provided on the side of the support platform away from the slider, and a support block is provided at the bottom of the support column. A locking nut is screwed into the support column, and the locking nut is tightened at the upper and lower ends of the support platform. The bottom of the diagonal brace assembly is fixedly connected to the top surface of the support platform, and the top of the diagonal brace assembly rests against the dam body.

[0021] The support platform achieves horizontal movement and positioning via slider two. The support column and its bottom support block constitute the main vertical load-bearing structure. By adjusting the height of the support column passing through the support platform and fixing it with upper and lower locking nuts, it can adapt to slight height differences in different foundations, ensuring the support platform surface is level and effectively transferring the weight of the dam to the ground. The diagonal bracing components tighten the dam body from the side, providing anti-overturning moment. The design of separate yet coordinated vertical and lateral supports allows the support components to provide the dam body with a stable temporary support that is adjustable and controllable in three dimensions, effectively ensuring structural safety and positional stability during hoisting and assembly.

[0022] Furthermore, the diagonal brace assembly includes a clamping block, a rotating seat one, a rotating seat two, and a diagonal brace rod. The rotating seat one is fixedly connected to the support platform, and the rotating seat two is fixedly connected to one side of the clamping block. One end of the diagonal brace rod is rotatably connected to the rotating seat one via a rotating shaft one. The end of the rotating shaft one is provided with a threaded connection part one, which is screwed into a limit sleeve one. The limit sleeve one is tightened on the rotating seat one. The other end of the diagonal brace rod is rotatably connected to the rotating seat two via a rotating shaft two. The end of the rotating shaft two is provided with a threaded connection part two, which is screwed into a limit sleeve two. The limit sleeve two is tightened on the rotating seat two.

[0023] The diagonal brace is hinged to the rotating seat at both ends via rotating shafts, allowing it to rotate freely to adapt to different support angle requirements. This flexibly and effectively transmits lateral support force to specific locations on the dam body. The threaded connection at the end of the rotating shaft engages with the limiting sleeve. After adjusting the angle, tightening the limiting sleeve compresses the inner surface of the rotating seat, generating significant friction to lock the rotating shaft and firmly fix the diagonal brace at the required angle. The operation is simple and quick, and the locking is reliable, ensuring that the angle of the diagonal brace does not change during construction and providing continuous and stable lateral support force.

[0024] The present invention, by adopting the above-described technical solution, has the following beneficial effects: In step d, this invention also includes fixing the cultivation trough. After the dam body is assembled, the bottom of the cultivation trough is fixedly connected to the top of two adjacent dam bodies using fasteners. Integrating and fixing the cultivation trough for planting aquatic plants to the dam top directly combines ecological functional components with structural components, achieving immediate ecologicalization of the low dam without secondary modifications. The fixed connection ensures the stability of the cultivation trough under the impact of river flow, preventing displacement or overturning; it also increases the connection stability between two adjacent dam bodies.

[0025] The positioning and support mechanism in this invention includes a positioning component and a support component. The positioning component is movably connected to a ball screw located in the second base, and the support component is movably connected to a ball screw located in the second base. The positioning component rests against one side of the dam body, and the support component supports the other side of the dam body. The drive component controls their coordinated operation on both sides of the mounting slot. The positioning component primarily provides precise lateral positioning and limiting, ensuring the accurate planar position of the dam body within the mounting slot. The support component primarily provides stable vertical and lateral support, resisting the dam body's own weight and potential lateral forces to prevent tipping. This "one-side positioning, one-side support" division of labor allows the hoisted dam body to be quickly and stably temporarily fixed in a preset position, creating safe and precise conditions for subsequent splicing operations. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings: Figure 1This is a schematic diagram of the structure of the present invention when the first dam body and the second dam body are joined together; Figure 2 This is a structural schematic diagram of the present invention when it is in the third dam body assembly stage; Figure 3 This is a schematic diagram of the structure of the present invention when the template is installed; Figure 4 This is a schematic diagram of the structure of the present invention during segmented casting; Figure 5 This is a schematic diagram of the dam structure in this invention; Figure 6 This is a schematic diagram of the structure of the splicing component in this invention; Figure 7 This is a schematic diagram of the connection between the culture tank and the fixing component in this invention; Figure 8 This is a schematic diagram of the positioning component in this invention; Figure 9 This is a schematic diagram of the supporting component in this invention; Figure 10 This is a schematic diagram of the fastener structure in this invention; Figure 11 This is a flowchart illustrating a construction method for an ecological river channel low dam according to the present invention.

[0027] In the diagram, 1-base plate; 2-mounting groove; 3-drive assembly; 4-dam body; 5-splicing block; 6-splicing frame; 7-splicing groove; 8-culture tank; 9-fixing component; 10-ecological flow hole; 11-limiting groove; 12-U-shaped clamping frame; 13-tightening screw; 14-tightening block; 15-limiting part; 16-installation part; 17-base one; 18-base two; 19-ball screw; 20-drive box; 21-screw motor; 22-positioning assembly; 23-support assembly; 24-slider 1. Block 1; 25. Base; 26. Column; 27. Positioning block; 28. Adjusting screw; 29. ​​Adjusting nut; 30. Support platform; 31. Diagonal brace assembly; 32. Slider 2; 33. Support column; 34. Support block; 35. Locking nut; 36. Clamping block; 37. Rotating seat 1; 38. Rotating seat 2; 39. Diagonal brace; 40. Rotating shaft 1; 41. Threaded connection part 1; 42. Limiting sleeve 1; 43. Rotating shaft 2; 44. Threaded connection part 2; 45. Limiting sleeve 2; 46. Template. Detailed Implementation

[0028] like Figures 1 to 11 The diagram illustrates a construction method for an ecological river channel low dam according to the present invention, comprising the following steps: a. Pre-construction preparation Before construction, the river dam site area was cleared, removing miscellaneous trees, weeds, garbage and loose soil from the surface, and the area was measured and laid out. b. Longitudinal straw bag cofferdam The dam body under construction was divided into sections and marked. Along the river channel, earthen bags with a top width of 2.0m and a height of 1.5m were built to form a sectioned cofferdam according to the markings. c. Dam foundation excavation and treatment Excavators were used to excavate at the construction site of the dam foundation, and manual trimming was carried out in conjunction with the excavation. After the excavation reached the design elevation, the dam foundation surface was compacted or tamped to ensure that the bearing capacity of the foundation met the design requirements. d. Dam installation 1) Concrete base slab pouring After the dam foundation has passed inspection, a concrete base slab is poured, and an installation groove for fixing the dam body is poured on the base slab. 2) Dam body splicing After the concrete base slab is cured, a fixed drive assembly is installed on both sides of the installation slot. A positioning support mechanism is movably connected to the drive assembly. The prefabricated segmented dam body is hoisted into the installation slot by hoisting equipment. The positioning support mechanism limits the dam body in the installation slot. Then, two adjacent dam bodies are connected by splicing parts. 3) Segmented casting After the current dam segment is spliced ​​into the installation slot, the drive components and positioning support mechanism are removed, and then the template 46 is installed along both sides of the installation slot for pouring and fixing. e. Complete construction Repeat steps b through d above to complete the construction of the low dam.

[0029] The dam body has splicing blocks 5 on both sides, and splicing frames 6 are provided for each splicing component. Splicing slots 7 are provided on both sides of the splicing frame 6 corresponding to the splicing blocks 5. The splicing blocks 5 of two adjacent dam bodies 4 are respectively inserted into the splicing slots 7 on both sides of the splicing frame 6. Through the insertion and engagement of the splicing blocks 5 on the sides of the prefabricated dam body 4 with the splicing slots 7 on the independent splicing frame 6, rapid and precise positioning and mechanical connection between adjacent dam bodies 4 are achieved. This not only significantly improves on-site splicing efficiency and assembly accuracy, ensuring the straightness of the dam body 4's alignment, but also enhances the overall structural stability and impact resistance by transferring and dispersing the load between adjacent dam bodies 4 through the splicing frame 6. As independent components, the splicing components facilitate standardized production and installation, reducing construction complexity, and providing convenience for possible subsequent partial replacement or maintenance.

[0030] In step b, the water-facing side of the sandbag cofferdam is covered with waterproof tarpaulin and compacted with bagged soil. By actively covering and compacting the water-facing side of the traditional sandbag cofferdam, a continuous seepage barrier is effectively constructed; the seepage prevention performance of the cofferdam is significantly enhanced, greatly reducing the amount of river water seeping into the construction area through the gaps in the sandbags, thus providing a drier and more stable working environment for subsequent processes such as dam foundation excavation and concrete pouring; construction quality is ensured, avoiding foundation softening or reduced concrete pouring quality due to seepage, while also reducing the drainage burden of the foundation pit and improving construction efficiency and safety.

[0031] Step d also includes fixing the cultivation trough 8. After the dam body 4 is assembled, the bottom of the cultivation trough 8 is fixedly connected to the top of the two adjacent dam bodies 4 using fasteners 9. The cultivation trough 8, used for planting aquatic plants, is integrated and fixed to the top of the dam; this directly combines ecological functional components with structural components, realizing the immediate ecologicalization of the low dam without secondary modification; the fixed connection ensures the stability of the cultivation trough 8 under the impact of river water flow, preventing its displacement or overturning; at the same time, it increases the connection stability between the two adjacent dam bodies 4. The dam body 4 has an ecological flow hole 10. The bottom of the cultivation tank 8 has limiting grooves 11 on both sides. The fixing component 9 includes a U-shaped clamping frame 12, a tightening screw 13 and a tightening block 14. The top of the U-shaped clamping frame 12 has a limiting part 15 and the bottom of the U-shaped clamping frame 12 has an installation part 16. The limiting part 15 is clamped in the limiting groove 11. The U-shaped clamping frame 12 is located in the ecological flow hole 10. The tightening screw 13 is movably connected to the installation part 16. The top of the tightening screw 13 is fixedly connected to the tightening block 14. The tightening block 14 is pressed against the top of the ecological flow hole 10, so that the cultivation tank 8 is fixedly connected to the top of the two adjacent dam bodies 4. By utilizing the inherent ecological flow passage 10 of the dam body 4 as the operating and force-bearing space, rapid and powerful locking without the need for pre-embedded parts is achieved; the U-shaped clamping frame 12 achieves initial positioning and prevents lateral movement by cooperating with the limiting part 15 and the limiting groove 11 of the cultivation tank 8; rotating the top tightening screw 13 drives the top tightening block 14 to press upward against the top wall of the flow passage, thereby generating a strong vertical clamping force to firmly anchor the cultivation tank 8 to the dam body 4; this method is convenient to install and disassemble, reliable in connection, can effectively resist water flow erosion and buoyancy, and does not damage the structural integrity of the dam body 4.

[0032] The drive assembly 3 includes a base 17, a base 2 18, a ball screw 19, a drive box 20, and a screw motor 21. The base 17 is located on the edge of the mounting groove 2 on the side away from the river channel, and the base 2 18 is located on the edge of the mounting groove 2 on the side closer to the river channel. Both bases 17 and 2 18 are rotatably connected to the ball screw 19. The ends of bases 17 and 2 18 are fixedly connected to one side of the drive box 20. The end of the ball screw 19 is connected to a transmission wheel, which is located inside the drive box 20. The screw motor 21 is fixedly connected to the other side of the drive box 20. The output end of the screw motor 21 is connected to a drive wheel, which is located inside the drive box 20. A transmission belt is connected between the drive wheel and the transmission wheel. The drive motor controls the rotation of the two ball screws 19. The ball screws 19 are movably connected to a positioning support mechanism. A single lead screw motor 21 drives the ball screws 19 on both sides to rotate synchronously via the transmission wheel, drive wheel and transmission belt in the drive box 20, ensuring that the positioning support mechanism installed on the lead screws on both sides can achieve strictly synchronous movement.

[0033] The positioning and support mechanism includes a positioning component 22 and a support component 23. The positioning component 22 is movably connected to a ball screw 19 located in base 2 18, and the support component 23 is movably connected to a ball screw 19 located in base 1 17. The positioning component 22 rests against one side of the dam body 4, and the support component 23 supports the other side of the dam body 4. The drive component 3 controls their coordinated operation on both sides of the mounting slot 2. The positioning component 22 mainly provides precise lateral positioning and limiting, ensuring the accurate planar position of the dam body 4 within the mounting slot 2. The support component 23 mainly provides stable vertical and lateral support, resisting the dam body 4's own weight and possible lateral forces to prevent tipping. This "one-side positioning, one-side support" division of labor allows the hoisted dam body 4 to be quickly and stably temporarily fixed in a preset position, creating safe and precise conditions for subsequent splicing operations.

[0034] The positioning assembly 22 includes a slider 24, a base 25, a column 26, and a positioning block 27. The slider 24 is fixedly connected to the bottom of the base 25 and movably connected to a ball screw 19 located in the base 18. The bottom of the column 26 is fixedly connected to the base 25, and an adjusting screw 28 is movably connected to the top of the column 26. The end of the adjusting screw 28 is fixedly connected to the positioning block 27, which rests against the dam body 4. Adjusting nuts 29 are screwed into both ends of the adjusting screw 28 and tightened onto the column 26. By rotating the adjusting screw 28, the extension length of the positioning block 27 relative to the column 26 can be finely adjusted, thereby precisely adjusting its clamping force on the dam body 4 and the accurate positioning point position. The adjusting nuts 29 are used to lock the adjusting screw 28, ensuring a stable positioning state. This ensures that each dam body 4 can be precisely clamped and fixed in the designed position, guaranteeing the straightness and flatness of the entire dam body 4 axis.

[0035] The support assembly 23 includes a support platform 30 and a diagonal brace assembly 31. A slider 2 32 is fixedly connected to the bottom of the support platform 30, and the slider 2 32 is movably connected to a ball screw 19 located in the base 17. A support column 33 is provided on the side of the support platform 30 away from the slider, and a support block 34 is provided at the bottom of the support column 33. A locking nut 35 is screwed into the support column 33, and the locking nut 35 is tightened at both the upper and lower ends of the support platform 30. The bottom of the diagonal brace assembly 31 is fixedly connected to the top surface of the support platform 30, and the top of the diagonal brace assembly 31 abuts against the dam body 4. The support platform 30 achieves horizontal movement and positioning through the slider 2 32. The support column 33 and its bottom support block 34 constitute the main vertical load-bearing structure. By adjusting the height of the support column 33 passing through the support platform 30 and fixing it with the upper and lower locking nuts 35, it can adapt to slight height differences in different foundations, ensuring the support platform is level and effectively transferring the weight of the dam body 4 to the ground. The diagonal bracing component 31 provides anti-overturning moment by laterally pressing against the dam body 4. The design of separate vertical and lateral support that can be adjusted in coordination enables the support component 23 to provide a stable temporary support for the dam body 4 that is adjustable and controllable in three dimensions, effectively ensuring structural safety and positional stability during the hoisting and splicing process. The diagonal brace assembly 31 includes a clamping block 36, a first rotating seat 37, a second rotating seat 38, and a diagonal brace 39. The first rotating seat 37 is fixedly connected to the support platform 30, and the second rotating seat 38 is fixedly connected to one side of the clamping block 36. One end of the diagonal brace 39 is rotatably connected to the first rotating seat 37 via a first rotating shaft 40. The end of the first rotating shaft 40 is provided with a threaded connection part 41, which is screwed into a first limiting sleeve 42. The first limiting sleeve 42 is tightened on the first rotating seat 37. The other end of the diagonal brace 39 is rotatably connected to the second rotating seat 38 via a second rotating shaft 43. The end of the second rotating shaft 43 is provided with a second threaded connection part 44, which is screwed into a second limiting sleeve 45. The second limiting sleeve 45 is tightened on the second rotating seat 38. The diagonal brace 39 is hinged to the rotating seat through the rotating shafts at both ends, allowing it to rotate freely to adapt to different support angle requirements. This flexibly and effectively transmits the lateral support force to a specific position on the dam body 4. The threaded connection at the end of the rotating shaft cooperates with the limiting sleeve. After adjusting the angle, tightening the limiting sleeve will press against the inner side of the rotating seat, generating a huge frictional force to lock the rotating shaft and firmly fix the diagonal brace 39 at the required angle. The operation is simple and quick, and the locking is reliable. It can ensure that the angle of the diagonal brace does not change during construction and provides a continuous and stable lateral support force.

[0036] This invention achieves uniformity and stability in dam installation benchmarks by setting up a concrete base plate and installation groove. Combined with the coordinated operation of the drive components and positioning support mechanism, it enables precise alignment and reliable clamping of the precast dam body during installation, effectively overcoming the dam tilting problem caused by uneven riverbank terrain. This method significantly improves the installation accuracy and efficiency of modular dams, ensures the overall stability and sealing of the low dam structure, while reducing reliance on large hoisting equipment and lowering the construction difficulty and safety risks in complex terrain.

[0037] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A construction method for an ecological river channel low dam, characterized in that... Includes the following steps: a. Pre-construction preparation Before construction, the river dam site area was cleared, removing miscellaneous trees, weeds, garbage and loose soil from the surface, and the area was measured and laid out. b. Longitudinal straw bag cofferdam The dam body under construction was divided into sections and marked. Along the river channel, earthen bags with a top width of 2.0m and a height of 1.5m were built to form a sectioned cofferdam according to the markings. c. Dam foundation excavation and treatment Excavators were used to excavate at the construction site of the dam foundation, and manual trimming was carried out in conjunction with the excavation. After the excavation reached the design elevation, the dam foundation surface was compacted or tamped to ensure that the bearing capacity of the foundation met the design requirements. d. Dam installation 1) Concrete base slab pouring After the dam foundation has passed inspection, a concrete base slab is poured, and an installation groove for fixing the dam body is poured on the base slab. 2) Dam body splicing After the concrete base slab is cured, a fixed drive assembly is installed on both sides of the installation slot. A positioning support mechanism is movably connected to the drive assembly. The prefabricated segmented dam body is hoisted into the installation slot by hoisting equipment. The positioning support mechanism limits the dam body in the installation slot. Then, two adjacent dam bodies are connected by splicing parts. 3) Segmented casting After the current dam segment is spliced ​​into the installation slot, the drive components and positioning support mechanism are removed, and then the template is installed along both sides of the installation slot for pouring and fixing. e. Complete construction Repeat steps b through d above to complete the construction of the low dam.

2. The construction method of an ecological river channel low dam according to claim 1, characterized in that: The dam body is provided with splicing blocks on both sides, and the splicing components are provided with splicing frames. The splicing frames are provided with splicing grooves on both sides corresponding to the splicing blocks. The splicing blocks of two adjacent dam bodies are respectively inserted into the splicing grooves on both sides of the splicing frame.

3. The construction method of an ecological river channel low dam according to claim 1, characterized in that: In step b, the water-facing side of the straw bag cofferdam is covered with waterproof tarpaulin and compacted with bagged soil.

4. The construction method of an ecological river channel low dam according to claim 1, characterized in that: Step d also includes fixing the culture tank. After the dam body is assembled, the bottom of the culture tank is fixedly connected to the top of the two adjacent dam bodies using fasteners.

5. The construction method of an ecological river channel low dam according to claim 4, characterized in that: The dam body has an ecological flow hole, and the bottom of the cultivation tank has limiting grooves on both sides. The fixing component includes a U-shaped clamping frame, a tightening screw, and a tightening block. The top of the U-shaped clamping frame has a limiting part, and the bottom of the U-shaped clamping frame has an installation part. The limiting part is clamped in the limiting groove. The U-shaped clamping frame is set in the ecological flow hole. The tightening screw is movably connected to the installation part. The top of the tightening screw is fixedly connected to the tightening block. The tightening block is pressed against the top of the ecological flow hole, so that the cultivation tank is fixedly connected to the top of two adjacent dam bodies.

6. The construction method of an ecological river channel low dam according to claim 1, characterized in that: The drive assembly includes a base one, a base two, ball screws, a drive box, and a screw motor. Base one is located on the edge of the mounting groove on the side away from the river channel, and base two is located on the edge of the mounting groove on the side closer to the river channel. Both base one and base two are rotatably connected to the ball screws. The ends of base one and base two are fixedly connected to one side of the drive box. The ends of the ball screws are connected to a transmission wheel, which is located inside the drive box. The screw motor is fixedly connected to the other side of the drive box. The output end of the screw motor is connected to a drive wheel, which is located inside the drive box. A transmission belt connects the drive wheel and the transmission wheel. The drive motor controls the rotation of the two ball screws, and the ball screws are movably connected to a positioning support mechanism.

7. The construction method of an ecological river channel low dam according to claim 6, characterized in that: The positioning support mechanism includes a positioning component and a support component. The positioning component is movably connected to the ball screw located in the second base, and the support component is movably connected to the ball screw located in the second base. The positioning component abuts against one side of the dam body, and the support component supports the other side of the dam body.

8. The construction method of an ecological river channel low dam according to claim 7, characterized in that: The positioning assembly includes a slider, a base, a column, and a positioning block. The bottom of the base is fixedly connected to the slider, which is movably connected to the ball screw located in the base. The bottom of the column is fixedly connected to the base, and the top of the column is movably connected to an adjusting screw. The end of the adjusting screw is fixedly connected to the positioning block, which rests against the dam body. Adjusting nuts are screwed into both ends of the adjusting screw, and the adjusting nuts are tightened onto the column.

9. The construction method of an ecological river channel low dam according to claim 7, characterized in that: The support assembly includes a support platform and a diagonal brace assembly. A slider two is fixedly connected to the bottom of the support platform. The slider two is movably connected to the ball screw located in the base one. A support column is provided on the side of the support platform away from the slider. A support block is provided at the bottom of the support column. A locking nut is screwed into the support column. The locking nut is tightened at the upper and lower ends of the support platform. The bottom of the diagonal brace assembly is fixedly connected to the top surface of the support platform. The top of the diagonal brace assembly abuts against the dam body.

10. The construction method of an ecological river channel low dam according to claim 9, characterized in that: The diagonal bracing assembly includes a clamping block, a first rotating seat, a second rotating seat, and a diagonal bracing rod. The first rotating seat is fixedly connected to the support platform, and the second rotating seat is fixedly connected to one side of the clamping block. One end of the diagonal bracing rod is rotatably connected to the first rotating seat via a first rotating shaft. The end of the first rotating shaft is provided with a first threaded connection part, which is screwed into a first limiting sleeve. The first limiting sleeve is tightened onto the first rotating seat. The other end of the diagonal bracing rod is rotatably connected to the second rotating seat via a second rotating shaft. The end of the second rotating shaft is provided with a second threaded connection part, which is screwed into a second limiting sleeve. The second limiting sleeve is tightened onto the second rotating seat.

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