Deepwater steel pipe pile-steel sheet pile combined cofferdam large-volume bearing platform and construction method thereof

Abstract

The invention relates to a deepwater steel pipe pile-steel sheet pile combined cofferdam large-volume bearing platform and a construction method thereof. The construction method comprises the steps of designing and manufacturing steel pipe pile-steel sheet pile combined cofferdam units; positioning and lofting; a steel pipe pile-steel sheet pile combined multifunctional movable guide frame is erected; performing rotary digging guide hole grooving construction; a steel casing head pile positioning frame; constructing a first pile steel casing; mounting a steel pipe pile-steel sheet pile positioning mounting sliding frame body; constructing a first steel pipe pile; the steel pipe pile-steel sheet pile combined cofferdam is constructed; a movable bearing platform pouring bottom sealing operation platform is constructed; pumping water in the combined cofferdam, and installing an inner enclosing purlin and an inner support; and constructing a bottom cast-in-place pile and a bearing platform. The steel pipe pile-steel sheet pile combined multifunctional moving guide frame can be used for rapid positioning and installation of a deepwater steel pipe pile-steel sheet pile combined cofferdam and can also be used for parallel moving pouring and rapid bottom sealing of a concrete bearing platform, the construction efficiency is improved, and the steel pipe pile-steel sheet pile combined multifunctional moving guide frame has remarkable economic benefits and wide application prospects.

Description

Technical Field

[0001] The invention relates to a large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam and a construction method thereof, belongs to the field of civil engineering, and is suitable for the construction of a large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam. Background Art

[0002] The large-volume cap of the deepwater steel pipe pile-steel sheet pile combined cofferdam is a widely used structural form in the field of marine or river engineering. It is usually used in the infrastructure construction of offshore or river wharfs, bridges, submarine pipelines and other projects. This combined cofferdam structure can effectively resist the influence of external environmental factors such as waves and tides, and ensure the stable operation of the project.

[0003] Steel pipe piles are hollow cylinders made of steel with high bearing capacity and anti-lateral displacement ability. Steel sheet piles are thin-walled structures welded from steel plates with large bearing area and compressive resistance. Combining these two materials can give full play to their respective advantages and form a more stable combined cofferdam structure. However, there are still some problems that need to be solved. First, there are certain safety hazards in the construction process. Due to the complexity of the deepwater environment and the limitations of construction conditions, the safety risks of construction personnel are high, and safety management and technical control need to be strengthened. Secondly, the construction period is long and the cost is high. Due to the difficulty and complexity of deepwater construction, the construction period is long and the cost is high. It is necessary to further optimize the construction plan and process flow to improve construction efficiency and economic benefits. In addition, the level of construction technology and equipment needs to be improved. At present, the research on the construction of large-volume caps of deepwater steel pipe pile-steel sheet pile combined cofferdam at home and abroad is still relatively limited, the level of construction technology and equipment needs to be improved, and it is necessary to increase scientific research investment and technological innovation.

[0004] Therefore, in order to further promote the development and application of large-volume foundation construction methods of deep-water steel pipe pile-steel sheet pile combined cofferdam, it is necessary to strengthen relevant research and technical breakthroughs, improve construction safety, efficiency and economy, and provide more reliable and stable foundation support for marine or river engineering construction. Summary of the invention

[0005] The purpose of the present invention is to provide a large-volume foundation of a deep-water steel pipe pile-steel sheet pile combined cofferdam and a construction method thereof, which can effectively ensure the safe operation and long-term stability of the project, improve the construction safety, efficiency and economy, and provide a more reliable and stable foundation support for marine or river engineering construction.

[0006] The purpose of the present invention can be achieved by the following method: A large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam, comprising: Hole guide groove, arc support plate, outer crossbeam, steel pipe support column, stiffener, fixing screw, latch, slide groove, arc guide groove, outer slide rail, inner purlin, shaped clamps, steel pipe piles, “∩” shaped steel sheet piles, inner slide rails, bolts, nuts, inner supports, “U” shaped bases, pumping pipes, pumping and drainage devices, drainage pipes, inverted L-shaped legs, conduits, round brackets, conduit casting devices, conduit positioning supports, mobile cap casting and bottom sealing operation platforms, positioning splints, connecting rods, middle crossbeams, fixed plates, guide slides, inner crossbeams, steel pipe pile-steel sheet pile positioning and installation sliding frames, steel pipe pile-steel sheet pile combination multifunctional mobile guide frames, reserved holes, bottom cast-in-place piles, caps, first pile positioning frames, fixed seats, adjustment jacks, annular stabilizers, arc-shaped pressure supports, rollers, first pile steel casings, cross plates, and steel casing reserved holes; It also includes: steel pipe pile-steel sheet pile combined cofferdam structure, steel pipe pile-steel sheet pile combined multifunctional mobile guide frame, steel pipe pile-steel sheet pile positioning and installation sliding frame, steel casing first pile positioning frame, inner purlin fixed diagonal bracing structure and movable cap casting and bottom sealing operation platform.

[0007] The steel pipe pile-steel sheet pile combined cofferdam structure consists of It is made of "∩" shaped steel sheet piles, steel pipe piles, and the outer wall of the steel pipe piles is symmetrically provided with multiple rows of Shape card firmware, The shaped clamping member is provided at the lower end The "∩"-shaped steel sheet piles are symmetrically provided with "L"-shaped clamps at both ends; the "∩"-shaped steel sheet piles are respectively inserted into the steel pipe piles on both sides. The "L" clamp of the "∩"-shaped steel sheet pile is inserted into the "∩"-shaped clamp to form the overall framework of the steel pipe pile-steel sheet pile combined cofferdam structure. Card firmware The shaped baffle realizes the bite; The steel pipe pile-steel sheet pile combined multifunctional mobile guide frame is used for the installation of the steel pipe pile-steel sheet pile positioning and installation sliding frame, the steel casing first pile positioning frame and the mobile cap casting and bottom sealing operation platform, which includes: steel pipe support columns, slide grooves, outer slide rails, and inner slide rails. The outer slide rails and inner slide rails are provided with steel pipe support columns at the bottom, and slide grooves are provided at the tops of the outer slide rails and inner slide rails. The steel pipe pile-steel sheet pile positioning and installation sliding frame is used for the positioning and installation of steel pipe piles and "∩"-shaped steel sheet piles, and includes: an arc support plate, an outer crossbeam, a positioning splint, a connecting rod, a middle crossbeam, a fixing plate, a guide slide, an inner crossbeam, and a roller; a steel pipe pile-steel sheet pile positioning and installation sliding frame is provided at the bottom of the steel pipe pile-steel sheet pile positioning and installation sliding frame, and the guide slide is provided on the inner side of the steel pipe pile-steel sheet pile positioning and installation sliding frame; the arc support plate, the outer crossbeam, the middle crossbeam, and the fixing plate constitute the positioning piece of the steel pipe pile, and the positioning splint, the middle crossbeam, the inner crossbeam, and the connecting rod constitute the positioning piece of the steel sheet pile; The first pile positioning frame of the steel casing is located at the top of the multifunctional mobile guide frame of the steel pipe pile-steel sheet pile combination, and is used for positioning and installing the first pile steel casing. It comprises: a fixed seat, an adjustment jack, an annular stabilizing member, an arc-shaped pressure support, and a steel casing reserved hole. The top of the first pile positioning frame of the steel casing is provided with a steel casing reserved hole, and the fixed seat is evenly arranged around the steel casing reserved hole in a radial shape; an adjustment jack is provided at the center of the inner side of the fixed seat, and the adjustment jacks are connected by an annular stabilizing member, and the top rod of the adjustment jack passes through the annular stabilizing member in turn, and the end of the top rod of the adjustment jack is connected with an arc-shaped pressure support; The inner purlin connection fixing structure is used to fix the combined cofferdam structure, which includes: fixing screws, latches, arc guide grooves, bolts, nuts, "U"-shaped bases, and middle cross beams; a "U"-shaped base is welded in the center of the inner side of the inner purlin, and the "U"-shaped base is used to connect the inner purlin with the inner support; the arc guide groove is welded near the inner end of the inner purlin, and the arc guide groove is used to connect the ends of adjacent inner purlins; The mobile foundation cap casting and bottom sealing operation platform is used for the parallel moving casting and rapid bottom sealing construction of the concrete foundation, which includes: a pumping pipe, a pumping and drainage device, a drainage pipe, an inverted L-shaped leg, a conduit, a circular bracket, a conduit casting device, a conduit positioning support, and rollers; the mobile foundation cap casting and bottom sealing operation platform is provided with rollers at the bottom, and a plurality of pumping and drainage devices and a conduit casting device are provided at the top, and a pumping pipe and a drainage pipe are respectively provided on the outside of the pumping and drainage device, and the conduit casting device is composed of an inverted L-shaped leg, a conduit, a circular bracket, and a conduit positioning support.

[0008] Furthermore, the steel pipe pile positioning member adopts an arc support plate, a fixed plate is provided in the center of the outer side of the arc support plate, and the other end of the fixed plate is connected to the inner side of the outer beam or the central part of the outer side of the middle beam; the steel sheet pile positioning member adopts a positioning splint, and a plurality of connecting rods are evenly distributed on the outer side of the positioning splint, and the other end of the connecting rods is connected to the inner side of the middle beam or the inner side of the inner beam.

[0009] Furthermore, the outer cross beam and the middle cross beam are connected to form an integral frame at the ends through a cross plate, and the middle cross beam and the inner cross beam are connected to form an integral frame at the ends through a cross plate; the ends of the outer cross beam, the middle cross beam and the inner cross beam are placed inside the guide chute.

[0010] Furthermore, multiple rows of inner purlins are welded on the inner wall of the steel pipe pile-steel sheet pile combined cofferdam structure. The inner purlins and inner supports are firmly connected by bolts, nuts, and a "U"-shaped base. The inner support is placed on the top of the "U"-shaped base, and the bolts pass through the "U"-shaped base and the side of the inner support in turn and are tightened by nuts.

[0011] Furthermore, a conduit positioning support is provided on the top of the movable pedestal casting bottom sealing operation platform, and an inverted L-shaped leg is arranged in a ring shape near the conduit positioning support. A circular bracket is welded on the top of the inverted L-shaped leg, and the bottom of the conduit passes through the conduit positioning support, and the funnel on the top of the circular bracket is placed on the circular bracket.

[0012] A construction method for a large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam as described above comprises the following steps: 1) Design and production of steel pipe pile-steel sheet pile combined cofferdam unit: Customized steel pipe piles and steel sheet pile units, inner purlins and inner supports in the factory, with multiple rows of steel pipe piles symmetrically welded on both sides Shaped clamping parts, steel sheet piles adopt "∩" shaped steel sheet piles; 2) Positioning and setting out: Position and lay out the guide hole slot, steel pipe support column, steel pipe pile and “∩” shaped steel sheet pile, bottom cast-in-place pile and first pile steel casing; 3) Erection of multifunctional mobile guide frame of steel pipe pile-steel sheet pile combination: According to the layout position of the steel pipe support column, the steel pipe support column is constructed first, and then the outer slide rail and inner slide rail with a slide groove in the center of the top of the steel pipe support column are installed respectively, which are used to install the steel pipe pile-steel sheet pile positioning installation sliding frame, the steel casing first pile positioning frame, and the mobile cap casting bottom sealing operation platform; 4) Rotary drilling and grooving construction: According to the positioning of the guide hole groove and the size of the steel pipe pile unit, a rotary drilling rig is used to cut the guide hole groove to ensure that the center of the steel pipe pile is aligned with the center of the guide hole groove. The bottom of the guide hole must be located at a set distance below the bottom surface of the cap. Before pulling out the casing, gravel backfill is first performed and earth backfill is completed; 5) Steel casing first pile positioning frame: According to the positioning and setting out position of the first pile steel casing, install the first pile positioning frame of the steel casing on the top of the outer slide rail and the inner slide rail, and fix it with a plug-in wedge, install a fixing seat on the top of the first pile positioning frame of the steel casing and adjust the jack; 6) Construction of the first pile steel casing: Use the first pile positioning frame of the steel casing to control the positioning of the first pile steel casing, adjust the jack to the appropriate position, and then use the crane to place the first pile steel casing, place the first pile steel casing in the middle position of the arc pressure support, and then lower the first pile steel casing, and adjust the jack in real time to correct the deviation and ensure the verticality of the first pile steel casing; 7) Steel pipe pile-steel sheet pile positioning installation sliding frame installation: After the construction of the first pile steel casing, the first pile positioning frame of the steel casing is removed, and then the rollers of the assembled steel pipe pile-steel sheet pile positioning and installation sliding frame are placed in the slide grooves of the outer slide rail and the inner slide rail. The steel pipe pile-steel sheet pile positioning and installation sliding frame is composed of the positioning parts of the steel pipe pile and the steel sheet pile. The positioning parts of the steel pipe pile and the steel sheet pile can slide along the guide slide groove. The arc support plate of the positioning part of the steel pipe pile is used to position and correct the steel pipe pile, and the positioning clamp of the positioning part of the steel sheet pile is used to position and correct the "∩"-shaped steel sheet pile; 8) Construction of the first steel pipe pile: Use the steel pipe pile-steel sheet pile positioning and installation sliding frame to drive and install the first steel pipe pile. Slide the steel pipe pile positioning piece to the position just above the first pile steel casing and fix it. Then use the crane to lift the first section of the steel pipe pile. Place the first steel pipe pile between the arc support plates and slowly drive the first steel pipe pile into the guide hole groove. 9) Construction of steel pipe pile-steel sheet pile combined cofferdam: Use the first section of steel pipe piles and steel pipe pile-steel sheet pile positioning and installation sliding frame to position and install the steel pipe pile-steel sheet pile combined cofferdam. According to the position of the first section of steel pipe piles, install the first "∩"-shaped steel sheet pile, slide the steel sheet pile positioning piece to the specified position, and then use the crane to lift the "∩"-shaped steel sheet pile and align one end of the "∩"-shaped steel sheet pile with the The clamping hole of the "∩"-shaped clamping piece is inserted slowly into the first "∩"-shaped steel sheet pile; Repeat step 8) and the above operations until the entire steel pipe pile-steel sheet pile combined cofferdam is completed; 10) Construction of mobile cap casting and bottom sealing operation platform: Place the rollers of the movable cap casting bottom sealing operation platform in the slide grooves of the outer slide rail and the inner slide rail, and arrange the drainage device and the conduit casting device on the top of the movable cap casting bottom sealing operation platform; 11) Pumping water from the combined cofferdam, installing the inner purlin and inner support: Use the pumping pipe of the pumping and drainage device to pump out the water in the combined cofferdam and drain it out through the drainage pipe; at the same time, weld the inner purlin with a "U"-shaped base welded in the center of the inner side to the inner wall of the steel pipe pile, connect the ends of adjacent inner purlins with arc-shaped guide grooves, place the pins in the arc-shaped guide grooves, and then pass the fixing screws through the arc-shaped guide grooves and the pins in sequence to tighten; then place the inner support in the "U"-shaped bases at both ends, and then fix them with bolts and nuts; 12) Bottom cast-in-place piles and foundation construction: According to the layout position of the bottom cast-in-place piles, use a drilling rig to drill the bottom cast-in-place piles, and then use the conduit casting device to cast the cap. Place the conduit in the circular bracket and the conduit positioning support, and then slide the movable cap casting bottom operating platform to carry out the bottom casting construction.

[0013] The present invention has the following outstanding advantages and remarkable effects: 1 The deepwater steel pipe pile-steel sheet pile combined cofferdam large-volume foundation construction method involved in the present invention can effectively ensure the safe operation and long-term stability of the project, improve the construction safety, efficiency and economy, and provide a more reliable and stable foundation support for the construction of marine or river projects.

[0014] 2 The steel pipe pile-steel sheet pile combined multifunctional mobile guide frame adopted in the present invention can be used for the rapid installation of the combined cofferdam and can also be used for the parallel movement pouring and rapid bottom sealing of the concrete cap, thereby improving the construction efficiency and having significant economic benefits.

[0015] 3 The steel pipe pile-steel sheet pile positioning and installation sliding frame used in the present invention is provided with a steel pipe pile positioning arc support plate and a steel sheet pile positioning clamping plate, and a guide roller is provided at the bottom of the sliding frame, which can realize the rapid positioning and installation of the combined cofferdam, and at the same time ensure the verticality of the steel pipe pile-steel sheet pile, thereby improving the construction efficiency and construction quality of the combined cofferdam.

[0016] 4 The deepwater steel pipe pile-steel sheet pile combined cofferdam of the present invention adopts The shaped card fixtures are used for connection, which can realize rapid positioning and splicing, greatly improving the construction efficiency.

[0017] The movable foundation casting and bottom sealing operation platform of the present invention is provided with a conduit casting device and a drainage device on the top, which can quickly realize the concrete bottom sealing construction of different areas through the slide rail, thus greatly improving the construction efficiency.

[0018] 6 The steel casing first pile positioning frame adopted in the present invention can realize the positioning and installation of the first pile steel casing, ensure the verticality of the steel casing, improve the foundation stability of the steel pipe pile-steel sheet pile combined multifunctional mobile guide frame, and ensure the construction quality and safety.

[0019] 7 The inner purlin connection fixing structure adopted in the present invention is cleverly designed and can realize alignment installation and disassembly, greatly improving the installation and disassembly construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of a large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam; Figure 2 It is a three-dimensional schematic diagram of the cross section of a large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam; Figure 3 It is a three-dimensional schematic diagram of the installation of the sliding frame and the guide rail; Figure 4 It is a three-dimensional schematic diagram of the cross section of a multifunctional mobile guide frame of a steel pipe pile-steel sheet pile combination; Figure 5 It is a three-dimensional schematic diagram of the construction section of the sliding frame and the guide rail; Figure 6 It is a three-dimensional schematic diagram of the cross section of a deepwater steel pipe pile-steel sheet pile combined cofferdam; Figure 7 It is a three-dimensional schematic diagram of a multifunctional mobile guide frame of a steel pipe pile-steel sheet pile combination; Figure 8 It is a three-dimensional schematic diagram of the structure of a mobile multifunctional operating platform; Fig. 9 It is a three-dimensional schematic diagram of a mobile multifunctional operating platform; Fig.10 It is a three-dimensional schematic diagram of the steel pipe pile-steel sheet pile positioning and installation sliding frame structure; Fig.11 It is a three-dimensional schematic diagram of the bottom of the sliding frame structure for positioning and installing steel pipe piles and steel sheet piles; Fig.12 It is a three-dimensional schematic diagram of the inner purlin connecting diagonal bracing structure; Fig.13 is a three-dimensional schematic diagram of the latch structure; Fig.14 It is a plan view of a “U” shaped steel sheet pile connection; Fig.15 It is a three-dimensional schematic diagram of the steel pipe pile-steel sheet pile connection; Fig.16 It is a three-dimensional schematic diagram of the steel pipe pile positioning parts and the steel sheet pile top positioning parts; Fig.17 It is a three-dimensional schematic diagram of the steel casing first pile positioning frame structure.

[0021] In the figure: 1. guide hole groove; 2. arc support plate; 3. outer cross beam; 4. steel pipe support column; 5. stiffening rod; 6. fixing screw; 7. latch; 8. slide groove; 9. arc guide groove; 10. outer slide rail; 11. inner purlin; 12. shaped clamp; 13, steel pipe pile; 14, "∩" shaped steel sheet pile; 15, inner slide rail; 16, bolt; 17, nut; 18, inner support; 19, "U" shaped base; 20, water pumping pipe; 21, water pumping and drainage device; 22, drainage pipe; 23, inverted L-shaped leg; 24, conduit; 25, round bracket; 26, conduit casting device; 27, conduit positioning support; 28, movable cap casting bottom sealing operation platform; 29, positioning splint; 30, connecting rod; 31, Middle crossbeam; 32. Fixed plate; 33. Guide slide; 34. Inner crossbeam; 35. Steel pipe pile-steel sheet pile positioning and installation sliding frame; 36. Steel pipe pile-steel sheet pile combination multifunctional mobile guide frame; 37. Reserved holes; 38. Bottom cast-in-place piles; 39. Cap; 40. First pile positioning frame; 41. Fixed seat; 42. Adjustment jack; 43. Ring stabilizer; 44. Arc-shaped pressure support; 45. Roller; 46. First pile steel casing; 47. Cross plate; 48. Steel casing reserved holes. DETAILED DESCRIPTION

[0022] The construction technical requirements such as steel pipe welding and cutting, steel cage binding, concrete pouring, etc. in the implementation mode of the present invention are not repeated here, and the implementation mode of the present invention is explained in detail below in conjunction with the drawings and examples. The description is not limited to the following examples.

[0023] Example 1 like Figure 1 to Figure 13 As shown, a large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam (the specific dimensions, specific widths, etc. mentioned below can be adjusted according to actual design requirements, and are not limited here, nor are specific examples given), mainly includes: 1. Material preparation We customized steel pipe piles 13 in a professional steel structure factory. The steel pipe piles are made of high-strength steel and are hollow cylinders with an outer diameter of [specific size, selected according to actual needs] and a wall thickness of [specific size, selected according to actual needs]. Multiple rows of steel pipe piles are symmetrically welded on the outer wall of the steel pipe piles. Shape card firmware 12, The shaped clamps are made of the same steel material as the steel pipe piles. The spacing of the clamps is determined according to the design requirements, generally [spacing value]. The shaped clamping member is provided at the lower end The size of the baffle is adapted to the clamping piece to ensure that it can effectively engage with the clamping piece of the “∩” shaped steel sheet pile.

[0024] Customized "∩" shaped steel sheet pile 14, the steel sheet pile is welded from high-quality steel plates, its cross-section shape is "∩" shaped, and the thickness of the steel plate is [specific thickness]. "L" shaped clamps are symmetrically set at the two ends of the "∩" shaped steel sheet pile, and the size and shape of the clamps should be consistent with The shaped card fixture matches the shape to ensure smooth insertion and engagement.

[0025] Prepare the inner purlin 11 and the inner support 18. The inner purlin is made of I-beam, the model is [specific model, selected according to actual needs], and the length is determined according to the circumference of the cofferdam. The inner support is made of steel pipe, the diameter of the steel pipe is [specific diameter, selected according to actual needs], and the wall thickness is [specific wall thickness, selected according to actual needs].

[0026] Two-component assembly and connection 1. Steel pipe pile-steel sheet pile combined cofferdam structure Insert the "∩" shaped steel sheet piles 14 into the steel pipe piles 13 on both sides one by one. In the insertion process, ensure that the "L" clamp of the "∩" shaped steel sheet pile 14 is accurately inserted into the "L" clamp of the "∩" shaped steel sheet pile 14. The "L" card member is inserted into the card slot of the card member 12, and the "L" card member is connected with the card member 12. Shape card firmware 12 The shaped baffles are tightly engaged to form a stable connection. According to the design requirements, the entire steel pipe pile-steel sheet pile combined cofferdam structure is assembled in sequence to form the overall skeleton of the cofferdam.

[0027] 2. Multifunctional mobile guide frame for steel pipe pile-steel sheet pile combination 36 First, the foundation position of the steel pipe support column 4 is determined according to the design position at the construction site, and the foundation construction is carried out. The foundation is cast with concrete, and the size is [foundation size, selected according to actual needs] to ensure that it can bear the weight of the guide frame and the load during the construction process.

[0028] The steel pipe support column 4 is installed on the foundation. The steel pipe support column adopts a steel pipe with a diameter of [specific diameter, selected according to actual needs] and a wall thickness of [specific wall thickness, selected according to actual needs], and is fixedly connected to the foundation by anchor bolts.

[0029] An outer slide rail 10 and an inner slide rail 15 are installed on the top of the steel pipe support column 4. The outer slide rail 10 and the inner slide rail 15 are made of channel steel. The model of the channel steel is [specific model, selected according to actual needs]. The length of the slide rail is determined according to the size of the construction site and the size of the cofferdam. Generally, it should exceed the length of the cofferdam by a certain range to facilitate construction operations.

[0030] A slide groove 8 is set at the top of the slide rail. The slide groove is made of steel plate. The thickness of the steel plate is [the specific thickness is selected according to actual needs]. The width and depth of the slide groove must be compatible with the rollers of the steel pipe pile-steel sheet pile positioning and installation sliding frame 35, the steel casing first pile positioning frame 40 and the movable foundation casting and bottom sealing operating platform 28 to ensure that they can slide smoothly in the slide groove.

[0031] 3. Positioning and installation of sliding frame of steel pipe pile-steel sheet pile 35 A roller 45 is installed at the bottom. The roller is a high-strength rubber wheel with a diameter of [specific diameter, selected according to actual needs] and a wheel width of [specific width, selected according to actual needs]. The roller is connected to the frame through a bearing to ensure that it can rotate flexibly.

[0032] A guide slot 33 is provided on the inner side of the frame. The guide slot is made of channel steel. The model of the channel steel is [specific model, selected according to actual needs]. The length of the guide slot is adapted to the length of the frame.

[0033] Make the positioning parts of the steel pipe pile 13, and assemble the arc support plate 2, the outer cross beam 3, the middle cross beam 31, and the fixed plate 32 according to the design requirements. The arc support plate 2 is made of arc-shaped steel plate, and its curvature matches the outer diameter of the steel pipe pile. The fixed plate 32 is welded to the center of the outer side of the arc support plate 2. The fixed plate 32 is made of steel plate, and its size is [specific size, selected according to actual needs]. The other end of the fixed plate 32 is connected to the inner side of the outer cross beam 3 or the central part of the outer side of the middle cross beam 31 by bolts. The outer cross beam 3 and the middle cross beam 31 are made of I-beams, and the model of the I-beams is [specific model, selected according to actual needs], and its length is determined according to the spacing of the steel pipe piles.

[0034] To make the positioning parts of the steel sheet pile, assemble the positioning clamp plate 29, the middle cross beam 31, the inner cross beam 34, and the connecting rod 30 according to the design requirements. The positioning clamp plate 29 is made of steel plate, and its shape and size are determined according to the shape and size of the "∩"-shaped steel sheet pile. A plurality of connecting rods 30 are evenly welded on the outside of the positioning clamp plate 29. The connecting rods 30 are made of round steel with a diameter of [specific diameter, selected according to actual needs]. The other end of the connecting rod 30 is connected to the inner side of the middle cross beam 31 or the inner side of the inner cross beam 34 by welding. The inner cross beam 34 is made of I-beam, and the model of the I-beam is [specific model, selected according to actual needs], and its length is determined according to the length of the "∩"-shaped steel sheet pile.

[0035] The outer cross beam 3 and the middle cross beam 31 are connected to form an integral frame at the end through a cross plate 47. The cross plate 47 is made of steel plate, and its size is [specific size, selected according to actual needs], and is connected to the outer cross beam 3 and the middle cross beam 31 by welding. Similarly, the middle cross beam 31 and the inner cross beam 34 are connected to form an integral frame at the end through a cross plate 47. After the connection is completed, the ends of the outer cross beam 3, the middle cross beam 31, and the inner cross beam 34 are placed inside the guide chute 33, so that the positioning piece can slide along the guide chute 33, thereby realizing the positioning and deviation correction of the steel pipe pile 13 and the "∩"-shaped steel sheet pile 14.

[0036] 4. Steel casing first pile positioning frame 40 At the top of the steel pipe pile-steel sheet pile combined multifunctional mobile guide frame 36, a steel casing first pile positioning frame 40 is installed according to the positioning and setting out position of the first pile steel casing 46. The positioning frame is made of steel structure, mainly composed of a fixing seat 41, an adjustment jack 42, an annular stabilizing member 43, an arc-shaped pressure support 44, etc.

[0037] A steel casing reserved hole 48 is provided on the top of the positioning frame, and the diameter of the reserved hole is larger than the outer diameter of the first pile steel casing 46 [specific difference], so that the first pile steel casing 46 can pass through smoothly.

[0038] The fixing seat 41 is evenly welded around the reserved hole 48 of the steel casing in a radial shape. The fixing seat 41 is made of steel plate and has a triangular or trapezoidal shape. The size is determined according to actual needs. An adjustment jack 42 is installed at the center of the inner side of the fixing seat 41. The model and quantity of the adjustment jack 42 are determined according to the weight and size of the first pile steel casing 46. Generally, a jack of [specific model, selected according to actual needs] is selected, and the quantity is [specific quantity, selected according to actual needs].

[0039] The adjusting jacks 42 are connected by an annular stabilizing member 43, which is made of steel pipe, and its diameter and wall thickness are determined according to the arrangement and stress of the jacks. The mandrels of the adjusting jacks 42 pass through the annular stabilizing member 43 in sequence, and the ends of the mandrels are connected with an arc-shaped pressure support 44, which is made of steel plate, and its curvature matches the outer diameter of the first pile steel casing 46, and is connected to the mandrel by welding.

[0040] 5. Inner purlin connection fixed structure A U-shaped base 19 is welded in the center of the inner side of the inner purlin 11. The U-shaped base is made of steel plate, and its size is determined according to the diameter and wall thickness of the inner support 18. The welding position of the U-shaped base should be accurate to ensure that the inner purlin 11 and the inner support 18 can be accurately connected.

[0041] An arc guide groove 9 is welded near the inner end of the adjacent inner purlin 11. The arc guide groove is made of channel steel. The model of the channel steel is [specific model, selected according to actual needs]. The curvature and length of the arc guide groove are determined according to the shape and size of the inner purlin 11, so that the ends of adjacent inner purlins 11 can be connected through the arc guide groove 9.

[0042] When the inner purlin 11 needs to be connected, the pin 7 is placed in the arc guide groove 9, and then the fixing screw 6 is passed through the arc guide groove 9 and the pin 7 in sequence for tightening. The fixing screw 6 adopts a high-strength bolt with a specification of [specific specifications, selected according to actual needs], and the tightening torque must meet the design requirements to ensure the stability of the connection.

[0043] 6. Mobile cap casting and bottom sealing operation platform 28 A roller 45 is installed at the bottom of the operating platform, and the specification and installation method of the roller are the same as those of the roller at the bottom of the steel pipe pile-steel sheet pile positioning installation sliding frame 35.

[0044] A plurality of pumping and drainage devices 21 and conduit casting devices 26 are arranged on the top of the operating platform. The pumping and drainage device 21 is mainly composed of a pump, a pumping pipe 20 and a drainage pipe 22. The pumping pump is a pump with a suitable flow rate and lift, and the pumping pipe 20 and the drainage pipe 22 are plastic pipes or steel pipes, and their diameters are determined according to the flow rate of the pump.

[0045] The conduit casting device 26 is composed of an inverted L-shaped leg 23, a conduit 24, a circular bracket 25, and a conduit positioning support 27. The inverted L-shaped leg 23 is made of a steel pipe, and its height and size are determined according to the height of the operating platform and the position of the conduit 24. The circular bracket 25 is welded on the top of the inverted L-shaped leg 23. The circular bracket 25 is made of a steel plate, and its diameter is larger than the outer diameter of the conduit 24 so that the conduit 24 can be stably supported. The conduit positioning support 27 is made of a steel structure, and its shape and size are adapted to the conduit 24, so that the position of the conduit 24 can be accurately fixed. The bottom of the conduit 24 passes through the conduit positioning support 27 and is placed on the circular bracket 25 to ensure that the conduit 24 is stable and reliable during the casting process.

[0046] Example 2 A large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam and a construction method thereof, comprising the following steps: 1) Design and production of steel pipe pile 13-steel sheet pile combined cofferdam unit: The steel pipe piles 13 and steel sheet pile units, inner purlins 11 and inner supports 18 are customized in the factory. The steel pipe piles 13 are symmetrically welded in multiple rows on both sides. shaped clamping member 12, the steel sheet pile adopts a "∩" shaped steel sheet pile 14; 2) Positioning and setting out: Positioning and setting out the positions of the lead hole slot 1, the steel pipe support column 4, the steel pipe pile 13 and the “∩” shaped steel sheet pile 14, the bottom cast-in-place pile 38, and the first pile steel casing 46; 3) Erection of the multifunctional mobile guide frame 36 of steel pipe pile-steel sheet pile combination: According to the layout position of the steel pipe support column 4, the steel pipe support column 4 is first constructed, and then the outer slide rail 10 and the inner slide rail 15 with a slide groove 8 in the center of the top are respectively installed on the top of the steel pipe support column 4, which are used to install the steel pipe pile-steel sheet pile positioning installation sliding frame 35, the steel casing first pile positioning frame 40 and the mobile cap casting bottom sealing operation platform 28; 4) Rotary drilling and grooving construction: According to the positioning of the lead hole groove 1 and the size of the steel pipe pile 13 unit, a rotary drilling rig is used to perform the lead hole groove construction to ensure that the center of the steel pipe pile 13 is aligned with the center of the lead hole groove 1. The bottom of the lead hole needs to be located 5.0 meters below the bottom surface of the cap. Before pulling out the casing, gravel backfill is first performed and the earth backfilling process is completed; 5) Steel casing first pile positioning frame 40: According to the positioning and setting out position of the first pile steel casing 46, the first pile positioning frame 40 of the steel casing is installed on the top of the outer slide rail 10 and the inner slide rail 15, and fixed with a plug-in wedge. Specifically, a fixing seat 41 and an adjustment jack 42 are installed on the top of the first pile positioning frame 40 of the steel casing; 6) Construction of the first pile steel casing 46: The first pile steel casing 46 is positioned and controlled by using the steel casing first pile positioning frame 40. Specifically, the jack 42 is adjusted to a suitable position, and then the first pile steel casing 46 is placed by a crane, and the first pile steel casing 46 is placed between the arc-shaped pressure supports 44. Then, the first pile steel casing 46 is lowered, and the jack 42 is adjusted in real time to correct the deviation, so as to ensure the verticality of the first pile steel casing 46. 7) Installation of the sliding frame 35 for positioning and installing steel pipe piles and steel sheet piles: After the construction of the first pile steel casing 46, the first pile positioning frame 40 of the steel casing is removed, and then the roller 45 of the assembled steel pipe pile-steel sheet pile positioning and installation sliding frame 35 is placed in the slide groove 8 of the outer slide rail 10 and the inner slide rail 15. Specifically, the steel pipe pile-steel sheet pile positioning and installation sliding frame 35 is composed of a positioning piece of a steel pipe pile 13 and a positioning piece of a steel sheet pile. The positioning piece of the steel pipe pile 13 and the positioning piece of the steel sheet pile can slide along the guide slide groove 33. The arc support plate 2 of the positioning piece of the steel pipe pile 13 is used to position and correct the steel pipe pile 13, and the positioning clamping plate 29 of the positioning piece of the steel sheet pile is used to position and correct the "∩"-shaped steel sheet pile 14; 8) Construction of the first steel pipe pile 13: The first steel pipe pile 13 is inserted and installed by using the steel pipe pile-steel sheet pile positioning and installation sliding frame 35. Specifically, the positioning piece of the sliding steel pipe pile 13 is moved to the position just above the first pile steel casing 46 and fixed. Then, the first section of the steel pipe pile 13 is lifted by a crane, and then the first steel pipe pile 13 is placed between the arc support plates 2. Then, the first steel pipe pile 13 is slowly inserted and driven into the guide hole groove 1. 9) Construction of steel pipe pile 13-steel sheet pile combined cofferdam: The steel pipe pile 13-steel sheet pile combined cofferdam is positioned and installed by using the first section of steel pipe pile 13 and the steel pipe pile-steel sheet pile positioning and installation sliding frame 35. Specifically, according to the position of the first section of steel pipe pile 13, the first "∩"-shaped steel sheet pile 14 is installed, the positioning piece of the steel sheet pile is slid to the specified position, and then the "∩"-shaped steel sheet pile 14 is hoisted by a crane, and one end of the "∩"-shaped steel sheet pile 14 is aligned with the The clamping hole of the "∩"-shaped clamping piece 12 is then slowly inserted into the first "∩"-shaped steel sheet pile 14; Repeat step 8 and the above operation until the entire steel pipe pile 13-steel sheet pile combined cofferdam is completed; 10) Construction of mobile cap casting and bottom sealing operation platform 28: The rollers 45 of the movable foundation casting bottom sealing operation platform 28 are placed in the slide grooves 8 of the outer slide rails 10 and the inner slide rails 15. Specifically, the drainage device 21 and the conduit casting device 26 are arranged on the top of the movable foundation casting bottom sealing operation platform 28; 11) Pumping water from the combined cofferdam and installing the inner purlin 11 and the inner support 18: The water in the combined cofferdam is pumped out by the pumping pipe 20 of the pumping and drainage device 21, and discharged by the drainage pipe 22; at the same time, the inner purlin 11 with a "U"-shaped base 19 welded to the inner wall of the steel pipe pile 13 is welded, and the ends of adjacent inner purlins 11 are connected by arc-shaped guide grooves 9. Specifically, the latch 7 is placed in the arc-shaped guide grooves 9, and the fixing screws 6 are passed through the arc-shaped guide grooves 9 and the latch 7 in sequence to tighten; then the inner support 18 is placed in the "U"-shaped bases 19 at both ends, and then fixed with bolts 16 and nuts 17; 12) Construction of bottom cast-in-place piles 38 and capping platform 39: According to the layout position of the bottom cast-in-place piles 38, a drilling rig is used to drill the bottom cast-in-place piles 38, and then the conduit casting device 26 is used to cast the foundation 39. Specifically, the conduit 24 is placed in the circular bracket 25 and the conduit positioning support 27, and then the movable foundation casting bottom operating platform 28 is slid to perform the bottom casting construction.

[0047] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0048] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0049] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0050] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam, characterized in that: include: The guide hole groove (1), the arc support plate (2), the outer cross beam (3), the steel pipe support column (4), the stiffening rod (5), the fixing screw (6), the latch (7), the slide groove (8), the arc guide groove (9), the outer slide rail (10), the inner purlin (11), shaped clamping piece (12), steel pipe pile (13), "∩" shaped steel sheet pile (14), inner slide rail (15), bolt (16), nut (17), inner support (18), "U" shaped base (19), water pumping pipe (20), water pumping and drainage device (21), drainage pipe (22), inverted L-shaped support leg (23), conduit (24), round bracket (25), conduit casting device (26), conduit positioning support (27), movable foundation casting and bottom sealing operation platform (28), positioning clamp (29), connecting rod (30), middle A crossbeam (31), a fixing plate (32), a guide slide groove (33), an inner crossbeam (34), a steel pipe pile-steel sheet pile positioning and installation sliding frame (35), a steel pipe pile-steel sheet pile combined multifunctional mobile guide frame (36), a reserved hole (37), a bottom cast-in-place pile (38), a cap (39), a first pile positioning frame (40), a fixing seat (41), an adjustment jack (42), an annular stabilizing member (43), an arc-shaped pressure support (44), a roller (45), a first pile steel casing (46), a cross plate (47), and a steel casing reserved hole (48); It also comprises: a steel pipe pile-steel sheet pile combined cofferdam structure, a steel pipe pile-steel sheet pile combined multifunctional mobile guide frame (36), a steel pipe pile-steel sheet pile positioning and installation sliding frame (35), a steel casing first pile positioning frame (40), an inner purlin (11) fixed diagonal bracing structure and a movable cap casting bottom sealing operation platform (28). The steel pipe pile-steel sheet pile combined cofferdam structure is composed of The steel pipe pile (13) is formed by splicing a "∩"-shaped clamping piece (12), a steel pipe pile (13), and a "∩"-shaped steel sheet pile (14). The outer side wall of the steel pipe pile (13) is symmetrically provided with multiple rows of Shape card firmware (12), The shaped clamping member (12) is provided with a The "∩"-shaped steel sheet pile (14) is symmetrically provided with "L"-shaped clamps at both ends; the "∩"-shaped steel sheet pile (14) is respectively inserted into the steel pipe piles (13) on both sides. The "∩"-shaped clamping piece (12) is inserted into the "L"-shaped steel sheet pile (14) to form the overall framework of the steel pipe pile-steel sheet pile combined cofferdam structure. Shape card firmware (12) The shaped baffle realizes the bite; The steel pipe pile-steel sheet pile combined multifunctional mobile guide frame (36) is used for the installation of a steel pipe pile-steel sheet pile positioning and installation sliding frame (35), a steel casing first pile positioning frame (40) and a movable cap casting and bottom sealing operation platform (28), and comprises: a steel pipe support column (4), a slide groove (8), an outer slide rail (10), and an inner slide rail (15); the outer slide rail (10) and the inner slide rail (15) are provided with a steel pipe support column (4) at the bottom, and a slide groove (8) is provided at the top of the outer slide rail (10) and the inner slide rail (15); The steel pipe pile-steel sheet pile positioning and installation sliding frame (35) is used for positioning and installing steel pipe piles (13) and "∩"-shaped steel sheet piles (14), and comprises: an arc support plate (2), an outer crossbeam (3), a positioning clamping plate (29), a connecting rod (30), a middle crossbeam (31), a fixing plate (32), a guide slide groove (33), an inner crossbeam (34), and a roller (45); a steel pipe pile-steel sheet pile positioning and installation sliding frame (35) is provided at the bottom of the steel pipe pile-steel sheet pile positioning and installation sliding frame (35), and the guide slide groove (33) is provided on the inner side of the steel pipe pile-steel sheet pile positioning and installation sliding frame (35); the arc support plate (2), the outer crossbeam (3), the middle crossbeam (31), and the fixing plate (32) constitute the positioning member of the steel pipe pile (13), and the positioning clamping plate (29), the middle crossbeam (31), the inner crossbeam (34), and the connecting rod (30) constitute the positioning member of the steel sheet pile; The steel casing first pile positioning frame (40) is located at the top of the steel pipe pile-steel sheet pile combined multifunctional mobile guide frame (36) and is used for positioning and installing the first pile steel casing (46). It comprises: a fixed seat (41), an adjustment jack (42), an annular stabilizing member (43), an arc-shaped pressure support (44), and a steel casing reserved hole (48). The top of the steel casing first pile positioning frame (40) is provided with a steel casing reserved hole (48). The fixed seat (41) is evenly arranged around the steel casing reserved hole (48) in a radial shape; an adjustment jack (42) is provided at the center of the inner side of the fixed seat (41), and the adjustment jacks (42) are connected by an annular stabilizing member (43). The top rod of the adjustment jack (42) passes through the annular stabilizing member (43) in sequence, and the end of the top rod of the adjustment jack (42) is connected with an arc-shaped pressure support (44); The inner purlin connection fixing structure is used to fix the combined cofferdam structure, and comprises: fixing screws (6), latches (7), arc-shaped guide grooves (9), bolts (16), nuts (17), a "U"-shaped base (19), and a middle cross beam (31); a "U"-shaped base (19) is welded at the center of the inner side of the inner purlin (11), and the "U"-shaped base (19) is used to connect the inner purlin (11) and the inner support (18); the arc-shaped guide groove (9) is welded near the inner side end of the inner purlin (11), and the arc-shaped guide groove (9) is used to connect the ends of adjacent inner purlins (11); The movable foundation cap casting and bottom sealing operation platform (28) is used for parallel movement casting and rapid bottom sealing construction of a concrete foundation cap (39), and comprises: a water pumping pipe (20), a water pumping and drainage device (21), a drainage pipe (22), an inverted L-shaped leg (23), a conduit (24), a circular bracket (25), a conduit casting device (26), a conduit positioning support (27), and a roller (45); the movable foundation cap casting and bottom sealing operation platform (28) is provided with a roller (45) at the bottom, and a plurality of water pumping and drainage devices (21) and a conduit casting device (26) are provided at the top; a water pumping pipe (20) and a drainage pipe (22) are respectively provided on the outside of the water pumping and drainage device (21); and the conduit casting device (26) is composed of an inverted L-shaped leg (23), a conduit (24), a circular bracket (25), and a conduit positioning support (27).

2. A large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam according to claim 1, characterized in that: The steel pipe pile (13) positioning member adopts an arc support plate (2), and a fixing plate (32) is provided at the center of the outer side of the arc support plate (2), and the other end of the fixing plate (32) is connected to the inner side of the outer cross beam (3) or the central part of the outer side of the middle cross beam (31); the steel sheet pile positioning member adopts a positioning clamping plate (29), and a plurality of connecting rods (30) are evenly distributed on the outer side of the positioning clamping plate (29), and the other end of the connecting rod (30) is connected to the inner side of the middle cross beam (31) or the inner side of the inner cross beam (34).

3. A large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam according to claim 1, characterized in that: The outer cross beam (3) and the middle cross beam (31) are connected at their ends via a cross plate (47) to form an integral frame, and the middle cross beam (31) and the inner cross beam (34) are connected at their ends via a cross plate (47) to form an integral frame; the ends of the outer cross beam (3), the middle cross beam (31) and the inner cross beam (34) are placed inside the guide chute (33).

4. A large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam according to claim 1, characterized in that: The inner wall of the steel pipe pile-steel sheet pile combined cofferdam structure is welded with multiple rows of inner purlins (11), and the inner purlins (11) are firmly connected to the inner support (18) by means of bolts (16), nuts (17), and a "U"-shaped base (19). The inner support (18) is placed on the top of the "U"-shaped base (19), and the bolts (16) pass through the "U"-shaped base (19) and the side of the inner support (18) in sequence, and are fastened by means of nuts (17).

5. The large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam according to claim 1, characterized in that: A conduit positioning support (27) is provided on the top of the movable foundation casting and bottom sealing operation platform (28), and an inverted L-shaped leg (23) is arranged in a ring shape near the conduit positioning support (27). A circular bracket (25) is welded on the top of the inverted L-shaped leg (23), and the bottom of the conduit (24) passes through the conduit positioning support (27), and the top funnel of the circular bracket (25) is placed on the circular bracket (25).

6. A construction method for a large-volume cap of a deepwater steel pipe pile-steel sheet pile combined cofferdam as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: 1) Design and production of steel pipe pile (13)-steel sheet pile combined cofferdam unit: The steel pipe piles (13) and steel sheet pile units, inner purlins (11) and inner supports (18) are customized in the factory. The steel pipe piles (13) are symmetrically welded in multiple rows on both sides. shaped clamping member (12), the steel sheet pile adopts a "∩" shaped steel sheet pile (14); 2) Positioning and setting out: Positioning and setting out the positions of the guide hole groove (1), the steel pipe support column (4), the steel pipe pile (13), the "∩"-shaped steel sheet pile (14), the bottom cast-in-place pile (38), and the first pile steel casing (46); 3) Installation of steel pipe pile-steel sheet pile combined multifunctional mobile guide frame (36): According to the layout position of the steel pipe support column (4), the steel pipe support column (4) is first constructed, and then an outer slide rail (10) and an inner slide rail (15) with a slide groove (8) at the center of the top of the steel pipe support column (4) are respectively installed on the top of the steel pipe support column (4) for installing a steel pipe pile-steel sheet pile positioning installation sliding frame (35), a steel casing first pile positioning frame (40), and a movable cap casting bottom sealing operation platform (28); 4) Rotary drilling and grooving construction: According to the positioning of the lead hole groove (1), according to the size of the steel pipe pile (13) unit, a rotary drilling rig is used to perform the lead hole groove construction, ensuring that the center of the steel pipe pile (13) is aligned with the center of the lead hole groove (1), and the bottom of the lead hole needs to be located at a set distance below the bottom surface of the cap. Before pulling out the casing, gravel backfill is first performed, and the earth backfilling process is completed; 5) Steel casing first pile positioning frame (40): According to the positioning and setting out position of the first pile steel casing (46), the first pile positioning frame (40) of the steel casing is installed on the top of the outer slide rail (10) and the inner slide rail (15), and fixed with a plug-in wedge, and a fixing seat (41) and an adjustment jack (42) are installed on the top of the first pile positioning frame (40) of the steel casing; 6) Construction of the first pile steel casing (46): The first pile steel casing (46) is positioned and controlled by using a steel casing first pile positioning frame (40), and the adjusting jack (42) is adjusted to a suitable position, and then the first pile steel casing (46) is placed by a crane, and the first pile steel casing (46) is placed between the arc-shaped pressure supports (44), and then the first pile steel casing (46) is lowered, and the adjusting jack (42) is adjusted in real time to achieve deviation correction, so as to ensure the verticality of the first pile steel casing (46); 7) Installation of the sliding frame (35) for positioning and installing the steel pipe pile and steel sheet pile: After the construction of the first pile steel casing (46), the first pile positioning frame (40) of the steel casing is removed, and then the roller (45) of the assembled steel pipe pile-steel sheet pile positioning and installation sliding frame (35) is placed in the slide groove (8) of the outer slide rail (10) and the inner slide rail (15). The steel pipe pile-steel sheet pile positioning and installation sliding frame (35) is composed of a positioning piece of a steel pipe pile (13) and a positioning piece of a steel sheet pile. The positioning piece of the steel pipe pile (13) and the positioning piece of the steel sheet pile can slide along the guide slide groove (33). The arc support plate (2) of the positioning piece of the steel pipe pile (13) is used to position and correct the steel pipe pile (13), and the positioning clamping plate (29) of the positioning piece of the steel sheet pile is used to position and correct the "∩"-shaped steel sheet pile (14); 8) Construction of the first steel pipe pile (13): The first steel pipe pile (13) is inserted and installed by using a steel pipe pile-steel sheet pile positioning and installation sliding frame (35), the positioning piece of the sliding steel pipe pile (13) is moved to the position just above the first pile steel casing (46) and fixed, and then the first section of the steel pipe pile (13) is hoisted by a crane, and then the first steel pipe pile (13) is placed between the arc support plates (2), and then the first steel pipe pile (13) is slowly inserted and driven into the guide hole groove (1); 9) Construction of steel pipe pile-steel sheet pile combined cofferdam: The steel pipe pile (13)-steel sheet pile combined cofferdam is positioned and installed by using the first section of steel pipe pile (13) and the steel pipe pile-steel sheet pile positioning and installation sliding frame (35). According to the position of the first section of steel pipe pile (13), the first "∩"-shaped steel sheet pile (14) is installed, and the positioning piece of the steel sheet pile is slid to the specified position. Then, the "∩"-shaped steel sheet pile (14) is hoisted by a crane, and one end of the "∩"-shaped steel sheet pile (14) is aligned with the The clamping hole of the "∩"-shaped clamping piece (12) is then slowly inserted into the first "∩"-shaped steel sheet pile (14); Repeat step 8) and the above operations until the construction of the entire steel pipe pile (13)-steel sheet pile combined cofferdam is completed; 10) Construction of mobile cap casting and bottom sealing operation platform (28): The rollers (45) of the movable foundation casting bottom sealing operation platform (28) are placed in the slide grooves (8) of the outer slide rails (10) and the inner slide rails (15), and a drainage device (21) and a conduit casting device (26) are arranged on the top of the movable foundation casting bottom sealing operation platform (28); 11) Pumping water from the combined cofferdam, installing the inner purlin (11) and the inner support (18): The water in the combined cofferdam is pumped out by using the pumping pipe (20) of the pumping and drainage device (21), and then discharged by using the drainage pipe (22); at the same time, the inner purlin (11) having a "U"-shaped base (19) welded at the center of the inner side is welded to the inner wall of the steel pipe pile (13), the ends of adjacent inner purlins (11) are connected by an arc-shaped guide groove (9), the latch (7) is placed in the arc-shaped guide groove (9), and the fixing screw (6) is passed through the arc-shaped guide groove (9) and the latch (7) in sequence to be tightened; then the inner support (18) is placed in the "U"-shaped base (19) at both ends, and then fixed by using bolts (16) and nuts (17); 12) Construction of bottom cast-in-place piles (38) and capping platform (39): According to the layout position of the bottom cast-in-place pile (38), the bottom cast-in-place pile (38) is bored by a drilling machine, and then the cap (39) is cast by a conduit casting device (26). The conduit (24) is placed in a circular bracket (25) and a conduit positioning support (27), and then the movable cap casting bottom sealing operation platform (28) is slid to perform the bottom sealing casting construction.

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