A kind of long drilling pile for beach area ultra-long fast turnover steel platform and its construction process

Abstract

The application discloses a kind of for beach area super-long drill hole pile fast turnover steel platform and its construction technology, structure includes steel casing, mud circulating system and assembly type platform structure, the steel casing is buried in drill hole position, the mud circulating system includes rigid pipeline system, mud pool and the beach ground structure of bearing assembly type platform structure, the beach ground structure includes the groove of arrangement rigid pipeline system, the ramming part formed after backfilling sand compaction after arrangement rigid pipeline system and the geotextile layer of laying on the ramming part, each steel casing is connected with the mud pool, and the steel casing is connected and fixed with the rigid pipeline system, and the assembly type platform structure is laid on the beach ground structure and the rigid pipeline system, and the assembly type platform structure is fixedly connected to the steel casing.The application does not produce solid waste, and has less impact on the ecological environment of beach area.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology and relates to a rapid turnover steel platform for ultra-long bored piles in tidal flat areas and its construction process. Background Technology

[0002] Currently, existing technologies face many challenges in the construction of ultra-long bored piles for railway / highway bridges in tidal flat areas, where environmental protection requirements are high, construction periods are tight, and routes are long. Current technologies for bored pile construction in tidal flat areas generally employ concrete hardening of the construction area to improve the stability and load-bearing capacity of the drilling platform. However, this hardened concrete area needs to be demolished after construction, generating solid waste and polluting the tidal flat environment. Furthermore, the need for site hardening before each pier construction is uneconomical, and the requirement to wait for the concrete to reach sufficient strength before installing equipment results in low construction efficiency. General construction methods require laying mud pipelines before each single pile construction, and then re-laying mud pipelines for each subsequent pile, reducing construction efficiency. Errors during the layout process can easily lead to mud overflow during drill lifting, polluting the environment. Summary of the Invention

[0003] The purpose of this invention is to provide a rapid turnover steel platform for ultra-long bored piles in tidal flat areas. This addresses the problems in existing technologies where concrete hardening is used to improve the stability and load-bearing capacity of bored platforms in tidal flat areas. These problems include the subsequent generation of waste and environmental pollution from breaking up the hardened area, as well as the need to repeatedly arrange mud pipes for each pile, which reduces construction efficiency and easily leads to errors.

[0004] A rapid turnover steel platform for ultra-long bored piles in tidal flat areas includes a steel casing, a mud circulation system, and a prefabricated platform structure. The steel casing is embedded at the borehole location. The mud circulation system includes a rigid pipeline system, a mud pit, and a tidal flat ground structure supporting the prefabricated platform structure. The tidal flat ground structure includes a trench for arranging the rigid pipeline system, a compacted section formed by backfilling and leveling sand after arranging the rigid pipeline system, and a geotextile layer laid on the compacted section. The rigid pipeline system connects each steel casing and the mud pit, and the steel casing and the rigid pipeline system are connected and fixed. The prefabricated platform structure is laid on the tidal flat ground structure and the rigid pipeline system, and the prefabricated platform structure is fixedly connected to the steel casing.

[0005] Preferably, the steel casing is fixedly connected to the rigid pipeline system, which includes several steel sleeves and steel conduits. The steel sleeves are fixedly fitted onto the outside of the steel casing, and the ends of the steel conduits are welded to the steel sleeves and can extend into the steel casing. A groove is formed on the steel casing at a position corresponding to the opening of the steel conduit. Angle steel is welded to both sides of the groove after it is expanded outward, and a water-stop strip is used to seal the gap between the steel casing and the rigid pipeline system to form a horizontal mud channel.

[0006] Preferably, the prefabricated platform structure includes platform components, each of which is rectangular and has at least two of the pile foundation holes. Adjacent platform components in the same prefabricated platform structure are laid closely together and fixedly connected. The prefabricated platform structure has pile foundation holes that correspond one-to-one with the steel casing, and hole cover plates are laid on the pile foundation holes that have not been drilled.

[0007] Preferably, the platform assembly includes a three-hole platform assembly and a two-hole platform assembly. The three-hole platform assembly has three pile foundation holes evenly distributed along its own length direction; the two-hole platform assembly has two pile foundation holes evenly distributed along its own length direction.

[0008] Preferably, the steel casing is arranged in a rectangular shape, and the prefabricated platform structure is formed by assembling multiple platform components with the same structure in the same direction. Correspondingly, in the rigid pipeline system, steel conduits are connected between adjacent steel casings, and at least one steel casing at each end of the rigid pipeline system is also fixedly connected to a steel conduit that connects to the mud pit.

[0009] Preferably, the steel casings are arranged in a circular shape, with one steel casing located at the center of the circle and six steel casings evenly distributed along the outer circumference of the circle. The prefabricated platform structure is sequentially divided into a two-hole platform assembly, a three-hole platform assembly, and another two-hole platform assembly. Adjacent steel casings on a circumference are connected to steel conduits, and the central steel casing is connected to at least two adjacent steel casings by steel conduits. The steel conduits between the central steel casing and adjacent steel casings are evenly distributed along the circumference of the central steel casing. At least two adjacent steel casings on the outer circumference are connected to steel conduits that communicate with the mud pit.

[0010] This invention also provides a construction process for a rapid turnover steel platform for ultra-long bored piles in tidal flat areas, comprising the following steps:

[0011] Step 1: Prepare for construction;

[0012] Step 2: Level and plan the site;

[0013] Step 3: Excavation and seepage prevention of mud pits. The excavated soil from the mud pits will be used to fill the construction area.

[0014] Step 4: Install steel casing;

[0015] Step 5: Arrangement of the mud circulation system;

[0016] Step 5 specifically includes: completing the fabrication of the main body of the rigid pipeline system in advance, excavating the mud pipeline on site, positioning and installing the rigid pipeline system, grooving the steel casing and treating for leakage prevention, effectively filling the surrounding gaps with fine sand after the rigid pipeline system is positioned and installed, compacting the surrounding area with small machinery, backfilling the top of the horizontal connection, and backfilling the excavated trench with well-permeable sandy soil. After backfilling, geotextile is laid, and the rigid pipeline system is positioned and reinforced. Then, the mud circulation system is debugged.

[0017] Step Six: Installation of the rapid turnover steel platform;

[0018] Step 7: Pile foundation construction.

[0019] Preferably, the grooving and grout leakage prevention treatment of the steel casing includes:

[0020] 1) Grooving the steel casing: After the mud circulation system is installed in place, grooves are made sequentially at the corresponding positions of the steel conduit openings.

[0021] 2) Grouting stop device at the slot: After the steel casing is slotted, the slotted parts are expanded outward on both sides and angle steel is welded. After the angle steel is welded, the gap between the steel casing and the rigid pipeline system is sealed by filling with rubber waterstop strips. Other gaps between the steel casing and the rigid pipeline system are backfilled with fine sand.

[0022] 3) The steel casing is fixedly connected to the mud circulation system. Iron plates are used to effectively fix the casing opening to the rigid pipeline system.

[0023] Preferably, step six includes: after backfilling and adding waterproof materials, installing the prefabricated platform structure, wherein each platform component has pre-reserved pile foundation holes, and matching cover plates are set at the impact holes. The platform components are directly laid tightly, and the connection between the platform components is effectively connected by pins or welding.

[0024] Step seven includes: first, the drilling rig is brought into position on the rapid turnover steel platform, then holes are drilled sequentially at the locations of each steel casing, and after drilling is completed and the drilling rig is removed, the prefabricated platform structure is dismantled and transported, and the cycle is repeated to complete the drilling of the remaining span.

[0025] The present invention has the following advantages:

[0026] 1. This invention utilizes a rigid management system for the mud circulation system embedded in sand during construction, ensuring that the structural strength of the treated tidal flat area meets load-bearing requirements. This eliminates the need for concrete hardening of the area, thus minimizing environmental impact and making it suitable for ecologically sensitive areas with high environmental protection requirements. The original soil excavation and filling process generates no solid waste, further reducing the impact on the tidal flat's ecological environment.

[0027] 2. The prefabricated platform structure used in this invention is directly laid out and fixed after positioning based on the steel casing. Therefore, after drilling is completed, the connection between the corresponding platform components and the steel casing can be released, which can achieve rapid turnover, reduce solid waste, lower costs, and improve construction efficiency.

[0028] 3. The rigid piping system in this solution, equipped with a mud circulation system, prevents mud overflow when the drilling rig is pulled out, and eliminates the need to rearrange the mud piping before pile foundation construction, thus improving construction efficiency. Furthermore, based on the structure of the rigid piping system and mud pit, this solution ensures timely replenishment of mud within the borehole casing, maintaining the mud head height and guaranteeing borehole stability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a steel platform for rapid turnover of ultra-long bored piles in tidal flat areas according to the present invention.

[0030] Figure 2 This is a schematic diagram of a construction site where the present invention is applied.

[0031] Figure 3 This is a top view of a rectangular prefabricated platform installed on a steel casing in one embodiment of the present invention.

[0032] Figure 4 for Figure 3 Front view of the structure shown (inlet and outlet pipes not shown).

[0033] Figure 5 for Figure 3 Top view of the rigid piping system in the structure shown.

[0034] Figure 6 for Figure 3 Top view of the three-hole platform component in the structure shown.

[0035] Figure 7 for Figure 6 Front view of the structure shown.

[0036] Figure 8 This is a top view of a steel casing after a circular prefabricated platform has been installed in one embodiment of the present invention.

[0037] Figure 9 For Figure 8 Top view of the rigid piping system in the structure shown.

[0038] Figure 10 for Figure 8 The top view of the two-hole platform component in the structure shown.

[0039] Figure 11 This is a flowchart illustrating the construction process of a rapid turnover steel platform for ultra-long bored piles in tidal flat areas, as described in this invention.

[0040] The labels in the attached diagram include: 1. Prefabricated platform structure; 11. Circular prefabricated platform; 12. Rectangular prefabricated platform; 13. Three-hole platform assembly; 14. Two-hole platform assembly; 15. Pile foundation hole location; 16. Top panel; 17. Steel section; 18. Bottom panel; 2. Slurry circulation system; 21. Primary sedimentation tank; 22. Return slurry tank; 23. New slurry tank; 24. Rigid pipeline system; 241. Steel conduit; 242. Steel sleeve; 25. Slurry inlet pipe; 26. Slurry outlet pipe; 3. Access road; 4. Drainage ditch; 5. Steel casing. Detailed Implementation

[0041] The following detailed description of the embodiments, with reference to the accompanying drawings, will further illustrate the specific implementation of the present invention, in order to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of the present invention.

[0042] like Figure 1-10 As shown, this invention discloses a rapid turnover steel platform for ultra-long bored piles in tidal flat areas, comprising a steel casing 5, a mud circulation system 2, and a prefabricated platform structure 1. The steel casing 5 is embedded at the borehole location. The mud circulation system 2 includes a rigid pipeline system 24, a mud pit, and a tidal flat ground structure supporting the prefabricated platform structure 1. The tidal flat ground structure includes a trench for arranging the rigid pipeline system 24, a compacted section formed by backfilling and leveling sand after arranging the rigid pipeline system 24, and a geotextile layer laid on the compacted section. The rigid pipeline system 24 connects each steel casing 5 and the mud pit. The steel casing 5 and the rigid pipeline system 24 are connected and fixed. The prefabricated platform structure 1 is laid on the tidal flat ground structure and the rigid pipeline system 24, and is fixedly connected to the steel casing 5.

[0043] The prefabricated platform structure 1 includes a bottom panel 18, a top panel 16, and a steel section 17, which is welded and fixed between the bottom panel 18 and the top panel 16. Both the bottom panel 18 and the top panel 16 are composed of several strip plates, which are perpendicular to the steel section 17. The prefabricated platform structure 1 has pile foundation holes 15 corresponding one-to-one with the steel casing 5. Hole cover plates are laid on the pile foundation holes 15 that have not been drilled. The pile foundation holes 15 are rectangular and have diagonal bracing structures welded at their corners.

[0044] The steel casing 5 is fixedly connected to the rigid pipeline system 24, and the connection method can be welding, pin connection formed by drilling, or clamp connection. The steel conduits 241 in the rigid pipeline system 24 are horizontally connected to form a parallel connection structure. The error between the parallel connection elevation of the rigid pipeline system 24 and the top elevation of the steel casing 5 is within 2cm. A waterproof material with an overlap of not less than 15cm is laid on the surface of the tidal flat structure. The height of the backfill around the steel casing 5 after backfilling is higher than the surrounding ground to facilitate drainage.

[0045] The rigid piping system 24 includes several steel sleeves 242 and steel conduits 241. The steel sleeves 242 are fixedly fitted onto the outside of the steel casing 5. The ends of the steel conduits 241 are welded to the steel sleeves 242 and can extend into the steel casing 5. A flexible hose is fixedly connected to the end of the steel conduit 241, which is used to transport slurry into the steel conduit 241 during pile foundation construction. The opening of the steel conduit 241 is the horizontal connection port of the horizontal connection structure. A groove is cut on the steel casing 5 at a position corresponding to the horizontal connection port to form a slot. Angle steel is welded to both sides of the slotted area after it is expanded outward, and a water-stop strip is used to seal the gap between the steel casing 5 and the rigid piping system 24 to form a horizontal connection slurry channel. The slurry-stopping device of the horizontal connection slurry channel is a professional pipeline sealing airbag for temporary sealing.

[0046] The prefabricated platform structure 1 includes platform components, each rectangular in shape and having at least two pile foundation holes 15. In this embodiment, there are two types of platform components: a three-hole platform component 13, which has three pile foundation holes 15 evenly distributed along its length; and a two-hole platform component 14, which has two pile foundation holes 15 evenly distributed along its length. Adjacent platform components within the same prefabricated platform structure 1 are tightly laid and fixedly connected. The fixed connection can be achieved through pin connections or by welding plates.

[0047] For example, a prefabricated platform structure 1 is a rectangular prefabricated platform 12, and the corresponding steel casings 5 ​​are arranged in a rectangular shape. The prefabricated platform structure 1 is formed by assembling multiple platform components with the same structure along the same direction, and the pile foundation holes 15 on each platform component correspond to the corresponding steel casings 5. For example, if there are two steel casings 5 ​​in width and three in length, then in this embodiment, the prefabricated platform structure 1 is formed by tightly laying and fixing two three-port platform components together. In the corresponding rigid pipeline system 24, the steel sleeves 242 are sleeved one-to-one with the steel casings 5, and steel conduits 241 are connected between adjacent steel sleeves 242. At least one steel sleeve 242 at each end of the rigid pipeline system 24 is also fixedly connected to a steel conduit 241 that connects to the mud pit.

[0048] Another type of prefabricated platform structure 1 is a circular prefabricated platform 11, and the corresponding steel protective cylinders 5 are arranged in a circular shape. One of the steel protective cylinders 5 is located at the center of the circle, while the other six are evenly distributed along the outer circumference of the circle. From one side of the prefabricated platform structure 1 to the other side, this scheme divides the prefabricated platform structure 1 into a two-hole platform component 14, a three-hole platform component 13, and another two-hole platform component 14. In the corresponding rigid pipeline system 24, the steel sleeves 242 and the steel casings 5 ​​are fitted together one by one. The steel conduits 241 are connected between adjacent steel sleeves 242 on a circumference. The steel sleeve 242 located in the center is connected to at least two adjacent steel sleeves 242 by the steel conduits 241. The steel conduits 241 between the central steel sleeve 242 and the adjacent steel sleeves 242 are evenly arranged around the central steel sleeve 242. At least two adjacent steel sleeves 242 at the outer edge are connected to the steel conduits 241 that connect to the mud pit.

[0049] The mud tank includes a primary sedimentation tank 21, a return mud tank 22, and a new mud tank 23 arranged in sequence. The primary sedimentation tank 21 and the return mud tank 22 are connected, and the return mud tank 22 and the new mud tank 23 are connected. The steel conduit 241 includes an inlet pipe 25 and an outlet pipe 26. The inlet pipe 25 connects the return mud tank 22 to the rigid pipeline system 24, and the outlet pipe 26 connects the rigid pipeline system 24 to the primary sedimentation tank 21.

[0050] The steel platform for rapid turnover of ultra-long bored piles in tidal flat areas also includes drainage ditches 4 symmetrically arranged on both sides of the mud circulation system 2 and the prefabricated platform structure 1, and the access road 3 is located between the prefabricated platform structure 1 and the drainage ditch 4 on the adjacent side.

[0051] like Figure 11As shown, based on the above-mentioned rapid turnover steel platform for ultra-long bored piles in tidal flat areas, the present invention also provides a construction process for a rapid turnover steel platform for ultra-long bored piles in tidal flat areas, including the following steps.

[0052] Step 1: Prepare for construction.

[0053] Step 2: Level and plan the site.

[0054] At this time, according to the plan, drainage ditch 4 is excavated, and the soil excavated from drainage ditch 4 is used to fill the access road 3 and lay steel plates.

[0055] Step 3: Excavation and seepage prevention of mud pits. The excavated soil from the mud pits will be used to fill the construction area.

[0056] Step 4: Install steel casing 5.

[0057] This step involves measuring and positioning according to the plan, and then driving the steel casing 5 (i.e., the permanent casing for the pile foundation) after the materials arrive on site, thus completing the installation of the steel casing 5.

[0058] Step 5: Arrangement of mud circulation system 2.

[0059] The fabrication of the slurry circulation system 2 (i.e., the main body of the rigid pipeline system 24) is completed beforehand, while the slurry pipeline excavation is carried out on site. Then, the slurry circulation system 2 (i.e., the rigid pipeline system 24) is positioned and installed, and the steel casing 5 is grooved and treated to prevent slurry leakage. After the rigid pipeline system 24 is positioned and installed, the excavated trench is backfilled and geotextile is laid (a layer of plastic film can be laid before laying the geotextile). At the same time, the slurry circulation system 2 (i.e., the rigid pipeline system 24) is positioned and reinforced, and then the slurry circulation system 2 is commissioned.

[0060] This step is the core part of this construction process, and it specifically includes the following steps.

[0061] (1) Trench excavation.

[0062] After the steel casing 5 is installed, a small excavator is used to excavate the connecting channel between adjacent steel casings 5. The excavation depth is 80cm. Over-excavation is strictly prohibited. Excavation should be carried out in an orderly manner and skipping is not allowed. After excavation, manual assistance is used to shape the trench. The excavation width is controlled at about 70cm. The area around the steel casing 5 is excavated manually. The excavation range is about 15cm outside the edge line of the steel casing 5.

[0063] (2) The mud circulation system 2 is installed in place.

[0064] The mud circulation system pipeline 2 was installed as a whole by hoisting, under the unified command of a designated person. The hoisting components were equipped with guy ropes to correct deviations and adjust their posture in a timely manner.

[0065] After installation, recheck the plane position, horizontal coupling elevation, and casing elevation. The overall error should be controlled within 2cm. After positioning, check whether the bottom is firmly attached to the system. If there are gaps, they should be effectively filled with fine sand.

[0066] (3) The mud circulation system 2 is in place and reinforced.

[0067] After the mud circulation system 2 is in place, fine sand is used to effectively fill the surrounding gaps, and small machinery is used to compact the surrounding area. The top of the flat joint is backfilled with 5cm of material, which should be well-permeable sandy soil. A two-way drainage slope is set at the top with the central pile position as the highest point to ensure that water does not accumulate in the drilling area during construction.

[0068] After backfilling is completed, lay tarpaulin or geotextile. Before laying, ensure that the site is flat, free of water and mud, and that the site is conducive to drainage.

[0069] The overlap length of the waterproofing material should be no less than 15cm. After laying, effective pressure and fixing measures are required to prevent displacement during construction. Pay special attention to the backfill quality around the steel casing 5; the backfill around the steel casing 5 can be appropriately higher than the surrounding ground level to facilitate drainage. The waterproofing material at the steel casing 5 should be tightly connected without any gaps.

[0070] (4) Grooving and grout leakage prevention treatment of steel casing 5.

[0071] 1) The steel casing has 5 slots.

[0072] After the mud circulation system 2 is installed, grooves are made sequentially at the corresponding positions of the flat joint (i.e., the steel conduit 241 pipe opening). The groove range is 5cm to the left and right of the edge line of the flat joint (i.e., the steel conduit 241).

[0073] 2) Grouting stop device at the slot.

[0074] After the steel casing 5 is grooved, the grooved area is expanded outward by 5cm on both sides, and 8cm angle steel is welded with a 6mm weld. Electric welding is used to ensure the angle steel is firmly welded. After the angle steel is welded, rubber waterstop strips are used to seal the gap between the steel casing 5 and the rigid pipeline system 24, effectively preventing grout leakage (geotextile or other soft, waterproof materials can also be used instead of the waterstop strips). Other gaps between the steel casing 5 and the rigid pipeline system 24 are backfilled with fine sand. A professional pipeline sealing airbag is used for temporarily sealing the horizontal grout channels.

[0075] 3) The steel casing 5 is fixedly connected to the mud circulation system 2.

[0076] To prevent the steel casing 5 from sinking during construction, iron plates are used to effectively fix and connect the casing opening of the steel casing 5 to the mud circulation system 2 (i.e., rigid pipeline system 24). The connection should be uniform and firm. It can be directly welded, or it can be connected by a pin with holes or by a clamp.

[0077] The construction sequence of steps (3) and (4) above is not important.

[0078] Step Six: Install the rapid turnover steel platform.

[0079] After backfilling and adding waterproofing materials, the prefabricated platform structure 1 is installed. Each platform component has pre-reserved pile foundation holes 15, and matching cover plates are installed at the impact holes. The platform components are laid directly and tightly, and the connections between platform components are effectively made using pins or welding. Sand was laid on top during the previous installation of the rigid pipeline system 24. Under dry conditions, the ground strength of the sand and the rigid management system meets the bearing capacity requirements.

[0080] Step 7: Pile foundation construction.

[0081] The first step involves positioning the drilling rig on a rapid turnover steel platform. Then, holes are drilled sequentially at the locations of each steel casing 5. After drilling is completed and the drilling rig is removed, the prefabricated platform structure 1 is dismantled and transported. This process is repeated to complete drilling of the remaining spans.

[0082] After adopting the above construction technology, the soil bearing capacity of the construction area needs to be strengthened, and the original soil is used for excavation and filling, which does not generate solid waste and has little impact on the ecological environment of the tidal flat area. The platform can achieve rapid turnover, improve construction efficiency, and reduce costs. At the same time, the mud circulation system 2 improves the stability of the drilling platform, prevents mud spillage, achieves civilized construction on site, and meets the requirements of railway standardized construction.

[0083] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A rapid turnover steel platform for ultra-long bored piles in tidal flat areas, characterized in that: The system includes a steel casing (5), a mud circulation system (2), and a prefabricated platform structure (1). The steel casing (5) is buried at the borehole location. The mud circulation system (2) includes a rigid pipeline system (24), a mud pit, and a tidal flat structure that supports the prefabricated platform structure (1). The tidal flat structure includes a trench for arranging the rigid pipeline system (24), a compacted section formed by backfilling and compacting sand after arranging the rigid pipeline system (24), and a geotextile layer laid on the compacted section. The rigid pipeline system (24) connects each steel casing (5) and the mud pit. The steel casing (5) and the rigid pipeline system (24) are connected and fixed. The prefabricated platform structure (1) is laid on the tidal flat structure and the rigid pipeline system (24). The prefabricated platform structure (1) is fixedly connected to the steel casing (5).

2. The rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to claim 1, characterized in that: The steel casing (5) is fixedly connected to the rigid pipeline system (24). The rigid pipeline system (24) includes several steel sleeves (242) and steel conduits (241). The steel sleeves (242) are fixedly sleeved on the outside of the steel casing (5). The end of the steel conduit (241) is welded to the steel sleeves (242) and can extend into the steel casing (5). The steel casing (5) is slotted at the position corresponding to the pipe opening of the steel conduit (241) to form a groove. Angle steel is welded to both sides of the slotted part after it is expanded outward, and water-stop strips are filled to seal the gap between the steel casing (5) and the rigid pipeline system (24) to form a flat mud channel.

3. A rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to claim 2, characterized in that: The prefabricated platform structure (1) includes a platform component, which is rectangular and has at least two pile foundation holes (15). Adjacent platform components in the same prefabricated platform structure (1) are closely laid and fixedly connected. The prefabricated platform structure (1) has pile foundation holes (15) that correspond one-to-one with the steel casing (5). The pile foundation holes (15) that have not been drilled are covered with hole cover plates.

4. A rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to claim 3, characterized in that: The platform assembly includes a three-hole platform assembly (13) and a two-hole platform assembly (14). The three-hole platform assembly (13) has three pile foundation holes (15) evenly distributed along its own length direction; the two-hole platform assembly (14) has two pile foundation holes (15) evenly distributed along its own length direction.

5. A rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to claim 4, characterized in that: The steel casing (5) is arranged in a rectangular shape. The prefabricated platform structure (1) is formed by assembling multiple platform components with the same structure in the same direction. In the corresponding rigid pipeline system (24), steel conduits (241) are connected between adjacent steel casings (242). At least one steel casing (242) at each end of the rigid pipeline system (24) is also fixedly connected to a steel conduit (241) that connects to the mud pit.

6. A rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to claim 4, characterized in that: The steel casings (5) are arranged in a circular shape, with one steel casing (5) located at the center of the circle, and six steel casings (5) are evenly distributed along the outer circumference of the circle. The prefabricated platform structure (1) is divided into a two-hole platform assembly (14), a three-hole platform assembly (13), and another two-hole platform assembly (14) in sequence. The steel conduits (241) are connected between adjacent steel casings (242) on a circumference. The steel casing (242) located in the center is connected to at least two adjacent steel casings (242) by the steel conduits (241). The steel conduits (241) between the central steel casing (242) and the adjacent steel casings (242) are evenly arranged along the circumference of the central steel casing (242). At least two adjacent steel casings (242) on the outer circumference are connected to steel conduits (241) that connect to the mud pit.

7. The construction process for a rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1: Prepare for construction; Step 2: Level and plan the site; Step 3: Excavation and seepage prevention of mud pits. The excavated soil from the mud pits will be used to fill the construction area. Step 4: Install steel casing (5); Step 5, Layout of the mud circulation system (2); Step 5 specifically includes: completing the processing and fabrication of the main body of the rigid pipeline system (24) in advance, completing the excavation of the mud pipeline on site, then positioning and installing the rigid pipeline system (24), grooving the steel casing (5) and preventing grout leakage, after the rigid pipeline system (24) is positioned and installed, using fine sand to effectively fill the surrounding gaps, using small machinery to compact the surrounding area, backfilling the top of the flat joint, and backfilling the excavated trench with well permeable sandy soil. After backfilling, geotextile is laid, and the rigid pipeline system (24) is positioned and reinforced at the same time, and then the mud circulation system (2) is debugged. Step Six: Installation of the rapid turnover steel platform; Step 7: Pile foundation construction.

8. The construction process for a rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to claim 7, characterized in that: The grooving and grout leakage prevention treatment of the steel casing (5) includes: 1) Grooving of steel casing (5) and grooving of the corresponding parts of the steel conduit (241) after the mud circulation system (2) is installed in place; 2) Grouting device at the slot opening: After the steel casing (5) is slotted, the slot opening is expanded on both sides and angle steel is welded. After the angle steel is welded, the gap between the steel casing (5) and the rigid pipeline system (24) is sealed by filling with rubber waterstop strips. Other gaps between the steel casing (5) and the rigid pipeline system (24) are backfilled with fine sand. 3) The steel casing (5) is fixedly connected to the mud circulation system (2), and the casing opening of the steel casing (5) is effectively fixedly connected to the rigid pipeline system (24) using iron plates.

9. The construction process for a rapid turnover steel platform for ultra-long bored piles in tidal flat areas according to claim 7, characterized in that: Step six includes: after backfilling and adding waterproof materials, installing the prefabricated platform structure (1), wherein each platform component has pre-reserved pile foundation holes (15), and matching cover plates are set at the impact holes. The platform components are directly laid tightly, and the connection between the platform components is effectively connected by pins or welding. Step seven includes: first, the drilling rig is brought into position on the rapid turnover steel platform, then holes are drilled sequentially at the locations of each steel casing (5), and after drilling is completed and the drilling rig is removed, the prefabricated platform structure (1) is dismantled and transported, and the remaining spans are drilled by repeating the cycle.

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