An anti-seepage curtain structure system for steel dam

Abstract

The invention discloses a steel structure dam anti-seepage curtain structure system, comprising an anti-seepage curtain and a dam body main road, wherein the left and right ends of the dam body main road are respectively located on the supporting piers of the slope caps corresponding to the slopes on both sides according to the design requirements, and are fixedly connected to the slope piles and supporting piers on the slope caps, and a panel is laid on the dam body main road to serve as a construction platform for the anti-seepage curtain and the steel structure dam body; the invention has a unique structure, which is not only the main body of anti-seepage, but also the main structure of the steel structure dam to prevent sinking, square sliding and square pulling, and is convenient to construct. The upper part of the curtain is connected with the main body of the steel structure dam, which increases the integrity of the dam body and the curtain and reduces the possibility of seepage. It not only effectively solves the problems of difficult operation and inconvenient construction during the construction of the existing steel structure dam anti-seepage curtain, but also solves the problems of large construction volume, long construction period and high construction cost of the existing steel structure dam anti-seepage curtain.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-seepage of steel structure dams, and particularly relates to an anti-seepage curtain structure system for steel structure dams. Background Art

[0002] In water conservancy projects, steel dams are a new type of water-retaining structure, characterized by novel structure, comprehensive design theory, reliable practical performance, and the flexibility, diverse styles, and mature technology of steel structures. They are also highly adaptable to complex terrain and geological environments. During the construction of existing steel dams, the anti-seepage curtain of the dam body is constructed together with the reinforced concrete foundation piles connecting the dam bottom. Currently, the anti-seepage curtain is commonly constructed using workboats or river cofferdams. When using workboats for water construction, since the workboats are anchored and fixed in position, the water in the river is constantly flowing, causing them to sway with the current. This makes construction difficult and inconvenient, reducing efficiency. Furthermore, due to the limited load capacity of the workboats, construction materials must be transported back and forth between the banks, which prolongs work time and increases construction costs. When river diversion is used, cofferdams are required to divert or intercept the river, resulting in a large project workload, a long construction period, and high construction costs. Summary of the Invention

[0003] In response to the defects and problems existing in the existing anti-seepage construction of steel structure dams, the present invention provides a steel structure dam anti-seepage curtain structure system. The system has a unique structure. It is not only the main body of anti-seepage, but also the main structure of the steel structure dam to prevent sinking, sliding and pulling out. The construction is convenient. The upper part of the curtain is connected to the main body of the steel structure dam, which increases the integrity of the dam body and the curtain and reduces the possibility of seepage. It not only effectively solves the problems of difficult operation and inconvenient construction during the construction of the existing steel structure dam anti-seepage curtain, but also solves the problems of large construction workload, long construction period and high construction cost of the existing steel structure dam anti-seepage curtain.

[0004] The solution adopted by the present invention to solve its technical problems is: a steel structure dam anti-seepage curtain structure system, including reinforced concrete structure stepped slope caps built on the bank slopes on both sides of the river channel, the vertical facade and horizontal bottom surface of the slope caps are respectively built with slope piles and support piers according to design requirements, and also include anti-seepage curtains and dam body main roads, support columns, anti-seepage curtains, and dam body structures. The entire steel structure system; the left and right ends of the dam body main road are respectively located on the support piers of the corresponding slope caps on the slopes on both sides of the river according to design requirements, and are fixedly connected to the slope piles and support piers on the slope caps. The dam body main road is paved with panels to serve as anti-seepage curtains and steel structure dam bodies. construction platform; the anti-seepage curtain includes a plurality of steel cage holes opened in sequence downward along the main road of the dam body on the riverbed on the upper side of the water-facing surface of the dam body according to design requirements, and a steel sheet pile hole is opened downward along the construction direction of the main road of the dam body between every two steel cage holes according to design requirements, and the steel sheet pile hole is connected with the adjacent steel cage holes to form an arc-shaped curtain casting trough, a curtain frame is placed in the curtain casting trough, and concrete is poured therein, the curtain frame includes a steel cage installed in the steel cage hole and a steel sheet pile installed in the steel sheet pile hole, and the steel sheet pile is connected to the adjacent steel cages on both sides to form an arched frame, and the concrete is poured into the curtain casting trough to form an arched anti-seepage curtain with the curtain frame.

[0005] The main road of the dam body includes truss structure fixed units at the left and right ends and a truss structure connecting unit in the middle, and panels are laid on the fixed units and the connecting units; the fixed units at the left and right ends of the main road of the dam body are respectively located on the supporting piers of the slope caps corresponding to the slopes on both sides according to design requirements, and are fixedly connected to the slope piles and supporting piers on the slope caps, and the two fixed units are fixedly connected horizontally by multiple connecting units, forming an arched truss structure-shaped main road of the dam body with a road on the top.

[0006] A plurality of composite piers are constructed on the riverbed below each unit body of the dam body main road according to design requirements. The composite piers located directly below the dam body main road are fixedly connected to the dam body main road to support the dam body main road.

[0007] The composite pier includes reinforced concrete structure foundation piles fixed in the riverbed. The top of the foundation pile protrudes from the riverbed and is provided with a connecting platform. The connecting platform is fixed with a support column, and the top of the support column is connected to the main channel of the dam body.

[0008] The construction steps of the curtain casting trough are as follows:

[0009] In S1, technicians precisely located the holes for the steel cages on the riverbed according to the design requirements. Using a dam erection machine, they placed the guide frame at the location where the holes would be. Using a vibratory hammer, they drove the steel cylinders down into the rock layer.

[0010] S2: After the steel cylinder reaches a preset depth in the rock layer, the vibrator is stopped and the vibrator is replaced with a drill. The drill is used to drill and clean the mud and rock in the steel cylinder, and the mud suction equipment is used to extract the mud and gravel in the foundation pile steel cylinder.

[0011] S3, after the mud, sand and gravel in the foundation pile steel cylinder are cleaned, the steel cylinder is pulled out, and the holes left on the riverbed become the steel cage holes;

[0012] S4, according to the design requirements, move the position of the erection machine on the main track of the dam body to confirm the accurate positioning of the position of the next steel cage hole, and then repeat the above steps until all the steel cage holes are opened according to the design requirements, and then proceed to the next step;

[0013] In step S5, technicians precisely locate the steel sheet pile holes on the riverbed according to the design requirements. They then use a rigging machine to lift the steel cylinder through the guide frame and insert it into the riverbed. The left and right ends of the steel cylinder are located in the adjacent steel cage holes. After the technicians check that the cylinder is vertical and meet the requirements, they use a vibratory hammer to drive the steel cylinder down into the rock layer.

[0014] S6, after the steel cylinder reaches a preset depth in the rock layer, the vibrator is stopped and the hammer vibrator is replaced with a drilling rig. The drilling rig is used to drill and clean the mud and rock in the steel cylinder, and the mud suction equipment is used to extract the mud and gravel in the foundation pile steel cylinder;

[0015] S7, after the mud, sand and gravel in the foundation pile steel cylinder are cleaned, the steel cylinder is pulled out, and the hole left on the riverbed connecting the two adjacent steel cage holes is the steel sheet pile hole;

[0016] S8. According to the design requirements, move the position of the erection machine on the main track of the dam body to confirm the precise positioning of the next steel sheet pile hole, and then repeat the above steps 5 to 7 until all the steel cage holes are opened according to the design requirements and the construction of the curved curtain casting trough is completed.

[0017] The depths of the steel sheet pile holes and the steel cage holes are consistent, and both extend into the rock layer below the riverbed.

[0018] The horizontal distance between every two adjacent steel cage holes is smaller than the diameter of the steel cage hole, and the diameter of the steel sheet pile hole is the same as the diameter of the steel cage hole.

[0019] The steel sheet pile is an ordinary U-shaped steel sheet pile. A linkage device that is compatible with the linkage device on the adjacent side of the steel sheet pile is vertically welded on the side of the steel cage adjacent to the steel sheet pile, and the two can be connected to each other.

[0020] Beneficial effects of the present invention: The present invention provides a steel dam anti-seepage curtain structure system, which has a unique system structure and includes reinforced concrete stepped slope caps built on the bank slopes on both sides of the river channel. Slope piles and support piers are respectively built on the vertical facade and horizontal bottom surface of the slope cap according to construction requirements. It also includes an anti-seepage curtain and a dam main road. The left and right ends of the dam main road are respectively located on the support piers of the slope caps corresponding to the two bank slopes according to design requirements. Panels are laid on the dam main road to serve as a construction platform for the anti-seepage curtain and the steel dam body. The anti-seepage curtain can reduce the impact of water flow on the steel dam body and enhance The steel structure dam body has high tensile and pull-out strength; and when the curtain casting trough for the anti-seepage curtain is opened, water operations can be carried out directly through the main channel of the dam body, so there is no need to intercept or divert the river, saving construction costs and shortening construction time; compared with the existing water operations using work boats, the main channel of the dam body is fixed on the bank slope pedestals on both sides of the river, the working platform is more stable and will not swing left and right with the water surface, the construction operation is less difficult and the construction is convenient, and construction vehicles can transport construction materials through the panels on the main channel of the dam body, thereby saving the time spent on transporting materials back and forth between the two sides of the river and improving work efficiency.

[0021] The present invention provides a steel structure dam anti-seepage curtain structure system, which has a unique system structure and is easy to construct. It not only effectively solves the problems of difficult operation and inconvenient construction during the construction of the existing steel structure dam anti-seepage curtain, but also solves the problems of large construction workload, long construction period and high construction cost during the construction of the existing steel structure dam anti-seepage curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the position of the anti-seepage curtain of the present invention.

[0024] Figure 3 It is a schematic diagram of the construction of the main track of the dam body of the present invention.

[0025] Figure 4 This is a horizontal cross-sectional view of the curtain casting trough.

[0026] Figure 5 yes Figure 4 A magnified schematic diagram of the structure in the middle.

[0027] Figure 6 It is a horizontal cross-sectional view of the anti-seepage curtain of the present invention.

[0028] Figure 7 It is a schematic diagram of the construction of the combined column pier of the present invention.

[0029] Numbers in the figure: 1 is the river channel, 11 is the bank slope, 12 is the riverbed, 13 is the rock layer, 3 is the slope cap, 4 is the main channel of the dam body, 41 is the fixed unit body, 42 is the connecting unit body, 5 is the anti-seepage curtain, 51 is the steel cage hole, 52 is the steel sheet pile hole, 53 is the curtain casting trough, 54 is the curtain frame, 541 is the steel cage, 542 is the steel sheet pile, 55 is concrete, 6 is the combined column pier, and 7 is the erection machine. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and examples.

[0031] Example 1

[0032] During the construction of existing steel structure dams, the anti-seepage curtain of the dam body is built together with the reinforced concrete foundation piles used to connect the bottom of the steel structure dam. The current anti-seepage curtain is generally constructed by working on the water with a work boat or by constructing a cofferdam to intercept the river. When using a work boat for water construction, the work boat is fixed in position by anchoring, but the water in the river is constantly flowing, so the work boat will swing left and right with the water flow, which will make the construction operation difficult and inconvenient, and reduce work efficiency. In addition, since the load capacity of the work boat is limited, it is necessary to continuously transport construction materials back and forth between the two banks, which prolongs the working time and increases the construction cost. When the river interception method is adopted for construction, it is necessary to adopt a cofferdam method to intercept or divert the river, which has a large amount of work, a long construction period and a high construction cost.

[0033] In view of the above problems, this embodiment provides a steel structure dam anti-seepage curtain system, such as Figure 1-7 As shown, it includes reinforced concrete stepped slope caps 3 built on the bank slopes 11 on both sides of the river channel 1. The slope caps 3 are fixed deep in the bedrock of the bank slopes by anchor rods. Slope piles and support piers are built on the vertical facades and horizontal bottom surfaces of the slope caps 3 according to design requirements. It also includes a dam main channel 4 and an anti-seepage curtain 5. The left and right ends of the dam main channel 4 are located on the support piers of the corresponding slope caps on the slopes on both sides of the river channel according to design requirements, and are fixedly connected to the slope piles and support piers on the slope caps. A panel is laid on the dam main channel to serve as a construction platform for the anti-seepage curtain. Specifically:

[0034] The main road 4 of the dam body includes a truss structure fixed unit body 41 at the left and right ends and a truss structure connecting unit body 42 in the middle, and panels are laid on the fixed unit body 41 and the connecting unit body 42; the fixed unit bodies 41 at the left and right ends of the main road 4 of the dam body are respectively located on the supporting piers of the slope cap 3 corresponding to the slopes 11 on both sides of the bank according to the design requirements, and are fixedly connected to the slope piles and supporting piers on the slope cap 3, and the two fixed units are fixedly connected horizontally by multiple connecting units, forming an arch with a road on top. The dam body main road 4 has a truss structure; four composite piers 6 are constructed on the riverbed 12 below each unit body of the dam body main road 4 according to the design requirements. The composite piers located directly below the dam body main road are fixedly connected to the dam body main road to support the dam body main road. The composite piers 6 include reinforced concrete structure foundation piles fixed in the riverbed. The top of the foundation pile protrudes from the riverbed and is provided with a connecting platform. The connecting platform is fixed with a support. The top of the support is connected to the dam body main road. The composite piers 6 under each unit body are constructed before the unit body. Figure 2 As shown, first, the first span fixed unit body 41 at one end of the main road 4 of the dam body is installed on the corresponding side slope pedestal 3 according to the design requirements, and then a panel is laid on the fixed unit body 41, and the panel is used as a construction platform; then the erection machine is transported and moved to the panel of the fixed unit body 41, and the erection machine is operated to build the combined column pier 6 on the riverbed within the radiation radius of the erection machine cantilever according to the design requirements. After the construction of the combined column pier 6 is completed, the erection machine is operated to hang and install the second span connection unit body 42 on the combined column pier 6 outside the fixed unit body 41 according to the design requirements, and after it is fixedly connected to the unit body of the adjacent span, a panel is laid on the second span connection unit body, and after the erection machine is moved to the connection unit body, the riverbed within the radiation radius of the erection machine cantilever according to the design requirements is erected. A composite column pier 6 is constructed on the bed. After the construction of the composite column pier 6 is completed, the erection machine is operated to hoist and install the third span connection unit 42 on the composite column pier 6 outside the second span connection unit according to the design requirements, and after it is fixedly connected to the unit of the adjacent span, a panel is laid on the third span connection unit, and the erection machine is moved to the third span connection unit and the above steps are repeated to construct the fourth span connection unit, until the final span fixed unit of the dam main channel is located on the supporting pier of the corresponding slope pedestal on the other side of the river channel according to the design requirements, and is fixedly connected to the slope piles and supporting piers on the slope pedestal, so that the interconnected span units constitute an arched truss structure dam main channel with a road on the top, which serves as a construction platform for the later steel structure dam body and anti-seepage curtain.

[0035] The anti-seepage curtain 5 comprises a plurality of steel cage holes sequentially opened downward along the main channel of the dam body on the riverbed on the waterfront side of the dam body according to design requirements. A steel sheet pile hole 52 is opened downward along the construction direction of the dam body main channel between every two steel cage holes 51 according to design requirements. The steel sheet pile hole 52 is connected with the adjacent steel cage holes 51 to form an arc-shaped curtain casting trough 53. The horizontal distance between every two adjacent steel cage holes is less than the diameter of the steel cage holes, and the diameter of the steel sheet pile hole is the same as the diameter of the steel cage hole, which facilitates construction. The construction steps are as follows:

[0036] In step 1, technicians accurately locate the position of the steel cage hole on the riverbed according to the design requirements, and use the erection machine used to build the dam body main road 4 to place the guide frame at the position where the steel cage hole is opened. Then, the erection machine is used to lift the steel cylinder through the guide frame and insert the steel cylinder into the riverbed. After the technicians check and confirm that the verticality of the cylinder is qualified, they use a vibratory hammer to drive the steel cylinder down into the rock layer;

[0037] Step 2: After the steel cylinder reaches a preset depth in the rock layer, stop the vibrating hammer and replace the hammer vibrator with a drilling rig. Use the drilling rig to drill and clean the mud and rock in the steel cylinder, and use the mud suction equipment to extract the mud and gravel in the foundation pile steel cylinder.

[0038] Step 3: After the mud, sand and gravel in the foundation pile steel cylinder are cleaned, the steel cylinder is pulled out, and the holes left on the riverbed become the steel cage holes;

[0039] Step 4: According to the design requirements, move the position of the erection machine on the main track of the dam body to confirm the accurate positioning of the next steel cage hole, and then repeat the above steps until all the steel cage holes are opened according to the design requirements, and then proceed to the next step;

[0040] Step 5: According to the design requirements, technicians accurately locate the position of the steel sheet pile holes on the riverbed. Then, they use a setting machine to lift the steel cylinder through the guide frame and insert it into the riverbed. The left and right ends of the steel cylinder are respectively located in the steel cage holes on the adjacent sides. After the technicians check and confirm that the verticality of the cylinder is qualified, they use a vibratory hammer to drive the steel cylinder down into the rock layer.

[0041] Step 6: After the steel cylinder reaches the preset depth in the rock layer, stop the vibrating hammer and replace the hammer vibrator with a drilling rig. Use the drilling rig to drill and clean the mud and rock in the steel cylinder, and use the mud suction equipment to extract the mud and gravel in the foundation pile steel cylinder.

[0042] Step 7: After the mud, sand and gravel in the foundation pile steel cylinder are cleaned, the steel cylinder is pulled out, and the hole left on the riverbed connecting the two adjacent steel cage holes is the steel sheet pile hole;

[0043] Step 8. According to the design requirements, move the position of the erection machine on the main track of the dam body to confirm the precise positioning of the next steel sheet pile hole, and then repeat the above steps 5 to 7 until all the steel cage holes are opened according to the design requirements and the construction of the curved curtain casting trough is completed.

[0044] A curtain frame 54 is placed in the curtain casting trough and poured with concrete. The curtain frame 54 includes a steel cage 541 installed in the steel cage hole 51 and a steel sheet pile 542 installed in the steel sheet pile hole 52. The steel sheet piles are connected to the adjacent steel cages on both sides to form an arch frame. There are many ways to connect the steel sheet piles 542 and the steel cage 541. For example, the steel sheet piles 542 are ordinary U-shaped steel sheet piles, and the side adjacent to the steel cage 541 and the steel sheet pile 542 is vertically welded with a linkage device that is compatible with the linkage device on the adjacent side of the steel sheet pile 542. After the construction of the arc-shaped curtain casting trough is completed, each steel cage is first hoisted and lowered into the corresponding steel cage hole according to the design requirements. Then, each steel sheet pile 542 is sequentially lowered into the corresponding steel sheet pile hole 51 according to the design requirements. When the steel sheet pile 51 is lowered into the steel sheet pile hole 51, the steel sheet pile 5 The linkage devices on the left and right sides of 42 will be connected with the linkage devices on the adjacent steel cages respectively. After all the steel sheet piles 542 are fully lowered into the steel sheet pile holes according to the design requirements, concrete can be poured into the curtain casting trough. The concrete poured into the curtain casting trough forms an arched anti-seepage curtain with the curtain frame. Compared with the existing water operation using a work boat or cofferdam diversion construction of the river channel, there is no need to divert or divert the river channel, which saves construction costs and shortens construction time. In addition, the main channel of the dam body is fixed on the bank slope pedestals on both sides of the river channel. Compared with the use of work boats for water construction, the working platform is more stable and will not swing left and right with the water surface. The construction operation is less difficult and the construction is convenient. Construction vehicles can transport construction materials through the panels on the main channel of the dam body, thereby saving the time spent on transporting materials to and from the two sides of the river channel and improving work efficiency.

[0045] Example 2

[0046] The difference between Example 2 and Example 1 is that, in this embodiment, the main channel of the dam body is constructed from the slopes 11 on both sides of the river simultaneously to the middle of the river channel. First, according to the design requirements, the first span fixed units 41 at the left and right ends of the main channel of the dam body are respectively installed on the corresponding side slope pedestals 3 according to the design requirements, and then panels are laid on the two fixed units 41, and the panels are used as construction platforms; then the two erection machines 7 are transported and moved to the panels of the corresponding fixed units 41, and the two erection machines simultaneously build combined piers 6 on the riverbed within the radiation radius of the erection machine cantilever according to the design requirements, and hoist and install the connection units 42 according to the design requirements until the connection units hoisted and installed by the two erection machines are fixedly connected together so that the interconnected span units constitute the main channel of the dam body in the shape of an arched truss structure with a road on top. Compared with Example 2, construction is carried out from the slopes 11 on both sides of the river simultaneously to the middle of the river channel, which speeds up the construction speed of the main channel of the dam body and improves work efficiency.

[0047] Example 3

[0048] The difference between Example 3 and Example 2 is that each steel cage and each steel sheet pile of the anti-seepage curtain is provided with a number, so that when the steel cage 541 or the steel sheet pile 542 is hoisted into the steel cage hole 51 or the steel sheet pile hole 52, it is convenient for the construction personnel to check whether the hoisted steel cage 541 or the steel sheet pile 542 is the same as the number of the hoisted component in the construction drawing, thereby avoiding hoisting and installation errors that affect the construction speed of the anti-seepage curtain.

Claims

1. A steel dam anti-seepage curtain structure system, comprising a reinforced concrete stepped slope cap constructed on the bank slopes on both sides of the river channel, wherein slope piles and support piers are respectively constructed on the vertical facade and horizontal bottom surface of the slope cap according to design requirements, characterized in that: It also includes an anti-seepage curtain and a main road of the dam body. The left and right ends of the main road of the dam body are respectively located on the supporting piers of the corresponding slope caps on the two bank slopes according to the design requirements, and are fixedly connected to the slope piles and supporting piers on the slope caps. A panel is laid on the main road of the dam body to serve as a construction platform for the anti-seepage curtain and the steel structure dam body; the anti-seepage curtain includes a plurality of steel cage holes opened in sequence downward along the main road of the dam body on the riverbed on the front side of the dam body facing the water according to the design requirements, and there is a steel cage hole between every two steel cage holes along the dam body according to the design requirements. A steel sheet pile hole is opened downward in the construction direction of the main road, and the steel sheet pile hole is connected with the adjacent steel cage hole to form an arc-shaped curtain casting trough. A curtain frame is placed in the curtain casting trough and poured with concrete. The curtain frame includes a steel cage installed in the steel cage hole and a steel sheet pile installed in the steel sheet pile hole, and the steel sheet pile is connected with the adjacent steel cages on both sides to form an arched frame. The concrete is poured into the curtain casting trough to form an arched anti-seepage curtain with the curtain frame; the main road of the dam body includes a truss structure fixing unit at both ends. The truss structure connecting unit bodies at the upper and middle parts of the dam body are provided, and panels are laid on the fixed unit bodies and the connecting unit bodies; the fixed unit bodies at the left and right ends of the dam body main road are respectively located on the supporting piers of the corresponding slope caps on the two bank slopes according to the design requirements, and are fixedly connected to the slope piles and supporting piers on the slope caps, and the two fixed unit bodies are fixedly connected horizontally by multiple connecting unit bodies, forming an arched truss structure dam body main road with a road on the top; a plurality of combined column piers are constructed on the riverbed below each unit body of the dam body main road according to the design requirements, and the combined column piers located directly below the dam body main road are fixedly connected to the dam body main road to support the dam body main road; the horizontal distance between each two adjacent steel cage holes is smaller than the diameter of the steel cage hole, and the diameter of the steel sheet pile hole is the same as the diameter of the steel cage hole; the steel sheet pile is an ordinary U-shaped steel sheet pile, and a linkage device compatible with the linkage device on the adjacent side of the steel sheet pile is vertically welded on the side of the steel cage adjacent to the steel sheet pile, and the two can be connected to each other.

2. The anti-seepage curtain structure system for steel structure dam according to claim 1 is characterized in that: The composite pier includes a reinforced concrete structure foundation pile fixed in the riverbed, the top of the foundation pile protrudes from the riverbed and is provided with a connecting platform, on which a support column is fixed, and the top of the support column is connected to the main channel of the dam body.

3. The anti-seepage curtain structure system for steel dam according to claim 1 is characterized in that: The construction steps of the curtain casting trough are as follows: S1, technicians accurately locate the position of the steel cage hole on the riverbed according to the design requirements, and use the erection machine used to build the main road of the dam body to place the guide frame at the position where the steel cage hole is opened, and use a vibrating hammer to drive the steel cylinder down into the rock layer; S2, when the depth of the steel cylinder extending into the rock layer reaches a preset depth, the vibrator is stopped, and the hammer vibrator is replaced with a drilling machine, the drilling machine is used to drill and clean the mud and sand in the steel cylinder, and the mud suction equipment is used to extract the mud and gravel in the steel cylinder of the foundation pile; S3, after the mud, sand and gravel in the foundation pile steel cylinder are cleaned, the steel cylinder is pulled out, and the holes left on the riverbed are the steel cage holes; S4, according to the design requirements, move the position of the erection machine on the main track of the dam body, confirm the accurate positioning of the position of the next steel cage hole, and then repeat the above steps until all the steel cage holes are opened according to the design requirements, and then proceed to the next step; S5, technicians accurately locate the position of the steel sheet pile hole on the riverbed according to the design requirements, and then use the erection machine to lift the steel cylinder through the guide frame to insert the steel cylinder into the riverbed, and the left and right ends of the steel cylinder are respectively located in the steel cage holes on the adjacent sides. After the technicians check and confirm that the verticality of the cylinder is qualified, they use a vibrating hammer to drive the steel cylinder down into the rock layer; S6, after the steel cylinder reaches a preset depth in the rock layer, the vibrator is stopped, and the vibrator is replaced with a drill, the drill is used to drill holes to clean the mud and sand in the steel cylinder, and the mud suction equipment is used to extract the mud and sand in the steel cylinder of the foundation pile; S7, after the mud, sand and gravel in the foundation pile steel cylinder are cleaned, the steel cylinder is pulled out, and the hole connecting two adjacent steel cage holes left on the riverbed is the steel sheet pile hole; S8. According to the design requirements, move the erection machine on the main track of the dam body to confirm the precise location of the next steel sheet pile hole, and then repeat the above steps 5 to 7 until all the steel cage holes are opened according to the design requirements and the construction of the arc curtain casting trough is completed.

4. The anti-seepage curtain structure system for steel dam according to claim 1, characterized in that: The depths of the steel sheet pile holes and the steel cage holes are consistent, and both extend into the rock layer below the riverbed.

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