Modularized construction platform impact holing super-long in-water pile foundation and construction method thereof

Abstract

The invention relates to a modular construction platform impact holing super-long in-water pile foundation and a construction method thereof. According to the system, through modular design, the construction platform is decomposed into a plurality of modules which can be independently manufactured, transported and installed, and the flexibility and adaptability of construction are improved. By adopting the multi-point joint control technology of the shaped double-layer profile steel guide frame and the jack, the accurate sinking of the steel casing is realized, and the construction efficiency and precision are improved. The steel box-launder efficient circulating slurry system ensures cyclic utilization and real-time adjustment of slurry, and guarantees safety and stability of drilling operation. The construction method comprises the steps of steel trestle construction, modular temporary platform building, steel casing installation, ultra-long underwater pile foundation impact hole forming modular construction platform construction, slurry system construction, pile foundation hole forming construction and the like. The construction problem under the complex coastal environment is effectively solved, and remarkable technical economic and social benefits are achieved.

Description

Technical Field

[0001] The invention relates to an ultra-long underwater pile foundation formed by impact drilling using a modular construction platform, and in particular to an ultra-long underwater pile foundation formed by impact drilling using a modular construction platform and a construction method thereof. Background Art

[0002] With the continuous construction of cross-river and cross-sea bridges, the construction of deep-water bridge foundations faces more and more difficulties. Extra-long underwater pile foundations often require two or more sections of steel cages to be spliced ​​and connected into the hole. Since the main bars of the steel cages are arranged in a circular shape, a slight manufacturing deviation during the binding process will lead to failure of the connection at the joint, and it takes a long time to correct the joint of the steel cage. As the splicing time of the steel cage is too long, it is very easy to cause the risk of hole collapse. The construction area has high waves and rapid currents, and is greatly affected by wind, waves, and tides. How to ensure the sinking accuracy of the steel casing (including plane position and verticality) is the focus and difficulty of offshore pile foundation construction. In addition, in the construction process of pile foundations of cross-sea bridges in water, mud circulation usually uses steel mud boxes or mud boats. Steel mud boxes need to be specially customized, use a large amount of steel, have a high cost, and occupy a large amount of space on the water construction platform. The mud transfer process is easy to overflow to the platform surface, which is not conducive to environmental protection, wastes a lot, and the amount of prepared mud is limited. Mud boats need to occupy waterways and have high rental costs, which is not conducive to cost control.

[0003] To sum up, for the construction of ultra-long underwater pile foundations using impact drilling on modular construction platforms, it is very important to seek a modular construction platform for ultra-long underwater pile foundations using impact drilling on modular construction platforms, which has fast construction speed, simple operation, and reliable construction quality, as well as a construction method thereof. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a modular construction platform for impact-forming an ultra-long underwater pile foundation and a construction method thereof.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical scheme: a modular construction platform impact-forms a super-long underwater pile foundation, comprising:

[0006] Steel trestles, which are fixed by steel pipe piles and provided with bearings, support plates, beams, Bailey beams, steel panels and guardrails;

[0007] The modular temporary platform is set at the pile foundation position on one side of the steel trestle. It is composed of Bailey beams, distribution beams and steel panels, and is used to place the standardized double-layer steel guide frame;

[0008] Standardized double-layer steel guide frame, which consists of upper annular positioning sleeve, lower annular positioning sleeve, inner support, outrigger, jack, U-shaped positioning groove, supporting steel plate, operating platform and ladder, is used for accurate sinking of steel casing;

[0009] Steel casing, which is sunk through a standardized double-layer steel guide frame and is used to support the modular construction platform for ultra-long underwater pile foundation impact drilling after construction is completed;

[0010] The modular construction platform for ultra-long underwater pile foundation impact drilling consists of a lower support hoop, an upper support hoop, a rib plate, a lower cross bar, an upper cross bar, a V-shaped web member, an oblique web member, a Bailey beam, a distribution beam, a steel panel and a guardrail;

[0011] The steel box-flow channel high-efficiency circulating mud system consists of a steel pipe flow channel, a recovery pipeline, a mud box and a pressure pump, and is used for the recycling and real-time adjustment of mud.

[0012] Furthermore, edge guardrails are arranged around the modular temporary platform, and the bottom of the Bailey beam is welded and fixed to the top crossbeam of the temporary steel pipe pile by a U-shaped clip to strengthen the connection between the platform and the supporting structure.

[0013] Furthermore, the legs of the standardized double-layer steel guide frame are inserted into the embedded plug-in base, the embedded plug-in base is welded to the steel panel of the modular temporary platform, and is bolted through the positioning clamps and fixing holes.

[0014] Furthermore, after the construction of the steel casing is completed, the temporary steel pipe piles and the modular temporary platform are removed, and the lower support hoop and the upper support hoop are installed at the designed position of the steel casing and reinforced with ribs.

[0015] Furthermore, the steel box-flow channel efficient circulating mud system connects the five longitudinal pile foundation casings into a whole through the steel casing steel pipe flow channel, forming a mud circulation loop to ensure the recycling and real-time renewal of the mud.

[0016] The present invention also provides a construction method for a modular construction platform to impact-drill an ultra-long underwater pile foundation, and the main construction steps are as follows:

[0017] Step 1: Steel trestle construction: driving steel pipe piles, setting bearings, support plates, beams, Bailey beams, steel panels and guardrails;

[0018] Step 2: Modular temporary platform construction: A modular temporary platform is set up at the pile foundation position on one side of the steel trestle, and a standardized double-layer steel guide frame is placed on it;

[0019] Step 3: Steel casing installation: Use the standardized double-layer steel guide frame to accurately sink the steel casing;

[0020] Step 4: Construction of modular construction platform for ultra-long underwater pile foundation impact hole forming: remove temporary steel pipe piles and modular temporary platform, install lower support hoop, upper support hoop and other components at the designed position of steel casing to form a modular construction platform for ultra-long underwater pile foundation impact hole forming;

[0021] Step 5: Construction of steel box-flow channel high-efficiency circulating mud system: The mud circulation loop is formed by steel pipe flow channel, recovery pipeline, mud box and pressure pump;

[0022] Step 6: Pile foundation hole construction: Through the modular construction platform and steel box-flow channel efficient circulation mud system, use the impact drill to carry out ultra-long underwater pile foundation hole construction.

[0023] Furthermore, in step three, precise sinking of the steel casing is achieved through a multi-point joint control guide frame of a jack, and auxiliary equipment including a vibrating hammer is used during the sinking process.

[0024] Furthermore, in step five, the mud is continuously renewed during the drilling process to ensure that there is always enough mud to support the drilling operation.

[0025] Furthermore, in step four, the components of the modular construction platform for ultra-long underwater pile foundation impact drilling include lower support hoops, upper support hoops, ribs, lower cross bars, upper cross bars, V-shaped web members, diagonal web members, Bailey beams, distribution beams, steel panels and guardrails.

[0026] Furthermore, in step one, the locations and quantities of the steel pipe piles of the steel trestle are determined according to actual engineering requirements to ensure the stability and bearing capacity of the steel trestle.

[0027] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0028] 1. Improve construction efficiency: Through modular design, the flexibility and adaptability of the construction platform are significantly improved, which is convenient for rapid construction and adjustment in complex environments. The application of standardized double-layer steel guide frame and jack multi-point joint control technology greatly improves the installation efficiency and accuracy of steel casing and reduces construction time.

[0029] 2. Reduce construction costs: The steel box-flow trough efficient circulation mud system is adopted. The recycling of mud reduces mud waste and reduces the cost of mud preparation and treatment. At the same time, the rapid construction and adjustment capabilities of the modular construction platform reduce the use time of construction equipment and labor costs.

[0030] 3. Ensure construction safety: The steel box-flow channel efficient circulation mud system ensures the safety and stability of drilling operations. The real-time adjustment and recycling of mud effectively prevents safety problems such as hole collapse that may occur during the drilling process. In addition, the design of the modular construction platform also improves the stability and safety of the construction process.

[0031] 4. Good environmental protection: The efficient use of the mud circulation system reduces the pollution of mud to the environment and reduces the environmental pressure during the construction process. At the same time, the rapid construction and dismantling of the modular construction platform reduces the impact of construction on the surrounding environment.

[0032] 5. Adapt to complex environment: The present invention can effectively cope with complex coastal environments, such as strong winds, big waves, tidal changes and other natural factors, ensure the stability and safety of the construction process, and is suitable for ultra-long underwater pile foundation construction in various complex environments.

[0033] In summary, the present invention has significant advantages in improving construction efficiency, reducing construction costs, ensuring construction safety, being environmentally friendly, and adapting to complex environments, and has good technical, economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a cross-sectional schematic diagram of a modular construction platform for ultra-long underwater pile foundation impact hole forming;

[0035] Figure 2 It is a plan view of a steel box-flow channel high-efficiency circulating mud system;

[0036] Figure 3 It is a schematic diagram of the installation plan of the standardized double-layer steel guide frame;

[0037] Figure 4 It is a schematic diagram of the installation elevation of the standardized double-layer steel guide frame;

[0038] Figure 5 This is a schematic diagram of the embedded plug-in base;

[0039] Figure 6 It is a schematic diagram of the standard double-layer steel guide frame;

[0040] Figure 7 It is a plan view of multi-point joint control of jacks.

[0041] In the figure: 1. Steel pipe pile; 2. Support; 3. Support plate; 4. Crossbeam; 5. Guardrail; 6. Steel panel; 7. Bailey beam; 8. Distribution beam; 9. Steel casing; 10. Lower support hoop; 11. Upper support hoop; 12. Rib plate; 13. Lower cross bar; 14. Upper cross bar; 15. V-shaped web member; 16. Diagonal web member; 17. Steel pipe flow channel; 18. Recovery pipeline; 19. Water level line; 20. Steel trestle; 21. Mud box; 22 , pressure pump; 23, temporary steel pipe piles; 24, reserved openings; 25, modular temporary platform; 26, operating platform; 27, standardized double-layer steel guide frame; 28, ladder; 29, embedded plug-in base; 30, fixing hole; 31, positioning card plate; 32, upper annular positioning sleeve; 33, lower annular positioning sleeve; 34, inner support; 35, outrigger; 36, jack; 37, U-shaped positioning groove; 38, support steel plate. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0043] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0044] Figure 1 It is a cross-sectional schematic diagram of a modular construction platform for ultra-long underwater pile foundation impact hole forming; Figure 2 It is a plan view of a steel box-flow channel high-efficiency circulating mud system; Figure 3 It is a schematic diagram of the installation plan of the standardized double-layer steel guide frame; Figure 4 It is a schematic diagram of the installation elevation of the standardized double-layer steel guide frame; Figure 5 This is a schematic diagram of the embedded plug-in base; Figure 6 It is a schematic diagram of the standard double-layer steel guide frame; Figure 7 It is a plan view of multi-point joint control of jacks.

[0045] Example 1

[0046] As shown in the figures, the modular construction platform impact-drilled super-long underwater pile foundation includes: steel pipe pile 1, support 2, support plate 3, cross beam 4, guardrail 5, steel panel 6, Bailey beam 7, distribution beam 8, steel casing 9, lower support hoop 10, upper support hoop 11, rib plate 12, lower cross bar 13, upper cross bar 14, V-shaped web member 15, oblique web member 16, steel pipe flow channel 17, recovery pipeline 18, water level line 19, steel trestle 20, mud box 21, pressure pump 22, temporary steel pipe pile 23, reserved hole 24, modular temporary platform 25, Operating platform 26, standardized double-layer steel guide frame 27, ladder 28, embedded plug-in base 29, fixing hole 30, positioning clamp 31, upper annular positioning sleeve 32, lower annular positioning sleeve 33, inner support 34, support leg 35, jack 36, U-shaped positioning groove 37, supporting steel plate 38; developed modular construction platform technology, jack multi-point joint control guide frame steel casing precise sinking technology, steel casing suspension impact expansion technology into rock, steel box-flow trough efficient circulation mud system, impact hole ultra-long pile foundation punching sequence optimization technology.

[0047] Temporary steel pipe piles 23 are driven around the steel casing 9 sinking position; a modular temporary platform 25 is built on the basis of the temporary steel pipe piles 23, which is mainly used to place the standardized double-layer steel guide frame 27; the modular temporary platform 25 is composed of Bailey beams 7, distribution beams 8, and steel panels 6. The distribution beams 8 and steel panels 6 are welded into a whole, which is convenient for lifting and installation. The modular temporary platform 25 mainly bears the standardized double-layer steel guide frame 27, and only needs to bear the weight of the standardized double-layer steel guide frame 27, so the bearing capacity of the modular temporary platform 25 fully meets the construction requirements. Edge guardrails 5 are set around the modular temporary platform 25; the bottom of the Bailey beam 7 is welded and fixed to the top crossbeam of the temporary steel pipe pile 23 by a U-shaped card, which strengthens the connection between the platform and the supporting structure.

[0048] The standardized double-layer steel guide frame 27 is composed of an upper annular positioning sleeve 32, a lower annular positioning sleeve 33, an inner support 34, a leg 35, a jack 36, a U-shaped positioning groove 37, a support steel plate 38, an operating platform 26, a ladder 28, etc., and is positioned by a double-layer steel positioning guide frame. The leg 35 is arranged at the bottom, and an upper annular positioning sleeve 32 and a lower annular positioning sleeve 33 are arranged in the reserved hole 24 of the steel casing 9; a support steel plate 38 is arranged on the upper annular positioning sleeve 32, and a U-shaped positioning groove 37 is arranged at the end of the support steel plate 38. A jack 36 is installed in the U-shaped positioning groove 37. The jack 36 ensures that the steel casing of the multi-point joint control guide frame of the jack 36 is accurately sunk; the leg 35 is inserted into the embedded plug-in base 29, wherein the embedded plug-in base 29 is welded on the steel panel 6 of the modular temporary platform 25, and a positioning card plate 31 is provided on the embedded plug-in base 29, and a fixing hole 30 is provided on the positioning card plate 31. The fixing hole 30 provided on the leg 35 is aligned with the fixing hole 30 of the positioning card plate 31 of the embedded plug-in base 29 and then bolted. The embedded plug-in base 29 adopts precise positioning and pre-installation technology, which avoids the cumbersome positioning problem of the stereotyped double-layer steel guide frame 27;

[0049] After the construction of the steel casing 9 is completed, the temporary steel pipe piles 23 and the modular temporary platform 25 are removed, and the lower support hoop 10 and the upper support hoop 11 are installed at the designed position of the steel casing 9, wherein the lower support hoop 10 and the upper support hoop 11 are provided with ribs 12 for reinforcement; the lower cross bar 13 and the upper cross bar 14 are welded to the lower support hoop 10 and the upper support hoop 11 respectively, and a V-shaped web member 15 is provided, and an oblique web member 16 is provided at the edge of the steel casing 9 to support the upper cross bar 14; Bailey beam 7, distribution beam 8, steel panel 6, and guardrail 5 are provided in sequence on the upper part of the upper cross bar 14 to form a modular construction platform for ultra-long underwater pile foundation impact drilling;

[0050] The steel box-flow channel high-efficiency circulating mud system is composed of a steel pipe flow channel 17, a recovery pipeline 18, a mud box 21, a pressure pump 22, etc.; the mud storage adopts the combination of mud box 21 + steel casing 9, and the steel casing 9 is opened. The five longitudinal pile foundation casings are connected into a whole by using the steel casing 9 steel pipe flow channel 17, and the mud circulation loop is formed by the steel casing 9 steel pipe flow channel 17, the recovery pipeline 18, the mud box 21 and the slurry pipe; the mud inside each steel casing 9 can flow in the longitudinal steel casing 9 to ensure the recycling of mud and avoid waste. The mud is continuously updated during the drilling process to ensure that there is always enough mud to support the drilling operation.

[0051] Example 2

[0052] The present invention also provides a construction method for a modular construction platform to impact-drill an ultra-long underwater pile foundation, and the main construction steps are as follows:

[0053] Step 1, steel trestle construction: The steel trestle 20 firstly drives steel pipe piles 1, sets support 2 on the top of the steel pipe piles 1, and sets support plate 3 for reinforcement, and sets cross beam 4, Bailey beam 7, steel panel 6, guardrail 5 on the upper part of the support 2 in sequence;

[0054] Step 2, modular temporary platform 25: a modular temporary platform 25 is set at the pile foundation position on one side of the steel trestle 20; temporary steel pipe piles 23 are set around the steel casing 9 sinking position; a modular temporary platform 25 is built on the basis of the temporary steel pipe piles 23, which is mainly used to place the standardized double-layer steel guide frame 27; the modular temporary platform 25 is composed of Bailey beam 7, distribution beam 8, and steel panel 6. The distribution beam 8 and the steel panel 6 are welded into a whole, which is convenient for lifting and installation. The modular temporary platform 25 mainly bears the standardized double-layer steel guide frame 27, and only needs to bear the weight of the standardized double-layer steel guide frame 27, so the bearing capacity of the modular temporary platform 25 fully meets the construction requirements. Edge guardrails 5 are set around the modular temporary platform 25; the bottom of the Bailey beam 7 is welded and fixed to the top crossbeam of the temporary steel pipe pile 23 by a U-shaped card, which strengthens the connection between the platform and the supporting structure.

[0055] Step 3, steel casing installation: The steel casing 9 is sunk by using a standardized double-layer steel guide frame 27; the standardized double-layer steel guide frame 27 is composed of an upper annular positioning sleeve 32, a lower annular positioning sleeve 33, an inner support 34, a leg 35, a jack 36, a U-shaped positioning groove 37, a support steel plate 38, an operating platform 26, a ladder 28, etc., and is positioned by a double-layer steel positioning guide frame, a leg 35 is arranged at the bottom, an upper annular positioning sleeve 32 and a lower annular positioning sleeve 33 are arranged in the reserved hole 24 of the steel casing 9; a support steel plate 38 is arranged in the upper annular positioning sleeve 32, a U-shaped positioning groove 37 is arranged at the end of the support steel plate 38, and a jack 36 is installed in the U-shaped positioning groove 37 to ensure that the jack 36 multi-point joint control guide frame steel casing is accurately sunk; the leg 35 is inserted into the pre-buried plug-in type In the base 29, the embedded plug-in base 29 is welded on the steel panel 6 of the modular temporary platform 25, a positioning card plate 31 is set on the embedded plug-in base 29, and a fixing hole 30 is set on the positioning card plate 31. The legs 35 are provided with fixing holes 30 and aligned with the fixing holes 30 of the positioning card plate 31 of the embedded plug-in base 29, and then bolted. The embedded plug-in base 29 adopts precise positioning and pre-installation technology to avoid the cumbersome positioning problem of the stereotyped double-layer steel guide frame 27; the steel casing 9 is lifted by a crane and placed in the upper annular positioning sleeve 32, and the steel casing is accurately sunk by the multi-point joint control guide frame of the jack 36, and slowly placed in the stereotyped double-layer steel guide frame 27. During the sinking process of the steel casing 9, auxiliary equipment such as a vibrating hammer is required; the steel casing 9 is constructed from the side of the steel trestle 20 to the distance in sequence:

[0056] Step 4: Construction of modular construction platform for impact hole formation of super-long underwater pile foundation: After the construction of steel casing 9 is completed, temporary steel pipe pile 23 and modular temporary platform 25 are removed, and lower support hoop 10 and upper support hoop 11 are installed at the designed position of steel casing 9, wherein lower support hoop 10 and upper support hoop 11 are provided with ribs 12 for reinforcement; lower cross bar 13 and upper cross bar 14 are welded to lower support hoop 10 and upper support hoop 11 respectively, and V-shaped web bar 15 is provided, and oblique web bar 16 is provided at the position of edge steel casing 9 to support upper cross bar 14; Bailey beam 7, distribution beam 8, steel panel 6 and guardrail 5 are provided in sequence on the upper part of upper cross bar 14 to form modular construction platform for impact hole formation of super-long underwater pile foundation;

[0057] Step 5. Construction of steel box-flow channel high-efficiency circulation mud system: The steel box-flow channel high-efficiency circulation mud system consists of steel pipe flow channel 17, recovery pipeline 18, mud box 21, pressure pump 22, etc.; mud storage adopts the combination of mud box 21 + steel casing 9, and adopts the method of opening holes in steel casing 9. The five longitudinal pile foundation casings are connected into a whole by using steel casing 9 steel pipe flow channel 17, and the mud circulation loop is formed by steel casing 9 steel pipe flow channel 17, recovery pipeline 18, mud box 21 and slurry pipe; the mud inside each steel casing 9 can flow in the longitudinal steel casing 9 to ensure the recycling of mud and avoid waste. The mud is continuously updated during the drilling process to ensure that there is always enough mud to support the drilling operation.

[0058] Step 6: Pile foundation hole construction: Use modular construction platform, steel box-flow channel efficient circulation mud system, and impact drilling rig to carry out ultra-long underwater pile foundation hole construction.

[0059] The parts not described in detail in the present invention are prior art, so the present invention does not describe them in detail.

[0060] 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.

[0061] Although more professional terms are used in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

[0062] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. The modular construction platform impacts the ultra-long underwater pile foundation, which is characterized by: include: A steel trestle (20) is fixed by steel pipe piles (1) and is provided with a support (2), a support plate (3), a cross beam (4), a Bailey beam (7), a steel panel (6) and a guardrail (5); A modular temporary platform (25) is arranged at the pile foundation position on one side of the steel trestle (20), and is composed of a Bailey beam (7), a distribution beam (8) and a steel panel (6), and is used to place a standardized double-layer steel guide frame (27); A standardized double-layer steel guide frame (27) is composed of an upper annular positioning sleeve (32), a lower annular positioning sleeve (33), an inner support (34), a leg (35), a jack (36), a U-shaped positioning groove (37), a supporting steel plate (38), an operating platform (26) and a ladder (28), and is used for accurately sinking the steel casing (9); A steel casing (9) is sunk through a standardized double-layer steel guide frame (27) and is used to support a modular construction platform for impact drilling of ultra-long underwater pile foundations after the construction is completed; The modular construction platform for ultra-long underwater pile foundation impact hole forming comprises a lower support hoop (10), an upper support hoop (11), a rib plate (12), a lower cross bar (13), an upper cross bar (14), a V-shaped web member (15), an oblique web member (16), a Bailey beam (7), a distribution beam (8), a steel panel (6) and a guardrail (5); A steel box-flow channel high-efficiency circulating mud system is composed of a steel pipe flow channel (17), a recovery pipeline (18), a mud box (21) and a pressure pump (22), and is used for the recycling and real-time adjustment of mud.

2. The modular construction platform impact-forming ultra-long underwater pile foundation according to claim 1 is characterized in that: The modular temporary platform (25) is provided with edge guardrails (5) around it, and the bottom of the Bailey beam (7) is welded and fixed to the top crossbeam of the temporary steel pipe pile (23) through a U-shaped clip to strengthen the connection between the platform and the supporting structure.

3. The modular construction platform impact-forming ultra-long underwater pile foundation according to claim 1 is characterized in that: The legs (35) of the standardized double-layer steel guide frame (27) are inserted into the embedded plug-in base (29), and the embedded plug-in base (29) is welded to the steel panel (6) of the modular temporary platform (25) and fixed by bolts through the positioning clamping plate (31) and the fixing holes (30).

4. The modular construction platform impact-forming ultra-long underwater pile foundation according to claim 1 is characterized in that: After the construction of the steel casing (9) is completed, the temporary steel pipe piles (23) and the modular temporary platform (25) are removed, and the lower support hoop (10) and the upper support hoop (11) are installed at the designed position of the steel casing (9), and reinforced by ribs (12).

5. The modular construction platform impact-forming ultra-long underwater pile foundation according to claim 1 is characterized in that: The steel box-flow channel high-efficiency circulating mud system connects five longitudinal pile foundation casings into a whole through the steel casing (9) and the steel pipe flow channel (17), forming a mud circulation loop to ensure the recycling and real-time renewal of the mud.

6. A construction method for ultra-long underwater pile foundation using impact drilling on a modular construction platform, characterized in that: The following steps are involved: Step 1, construction of steel trestle (20): driving steel pipe piles (1), setting bearings (2), support plates (3), cross beams (4), Bailey beams (7), steel panels (6) and guardrails (5); Step 2: Building a modular temporary platform (25): Setting up a modular temporary platform (25) at the pile foundation position on one side of the steel trestle (20), and placing a standardized double-layer steel guide frame (27) thereon; Step 3: Installation of steel casing (9): Use the standardized double-layer steel guide frame (27) to accurately sink the steel casing (9); Step 4: Construction of a modular construction platform for ultra-long underwater pile foundation impact hole formation: dismantle the temporary steel pipe pile (23) and the modular temporary platform (25), install the lower support hoop (10), the upper support hoop (11) and other components at the designed position of the steel casing (9), and form a modular construction platform for ultra-long underwater pile foundation impact hole formation; Step 5: Construction of a steel box-flow channel high-efficiency circulating mud system: A mud circulation loop is formed through a steel pipe flow channel (17), a recovery pipeline (18), a mud box (21) and a pressure pump (22); Step 6: Pile foundation hole construction: Through the modular construction platform and steel box-flow channel efficient circulation mud system, use the impact drill to carry out ultra-long underwater pile foundation hole construction.

7. The construction method according to claim 6, characterized in that: In step three, the precise sinking of the steel casing (9) is achieved by a multi-point joint control guide frame of a jack (36), and auxiliary equipment including a vibrating hammer is used during the sinking process.

8. The construction method according to claim 6, characterized in that: In step five, the mud is continuously renewed during the drilling process to ensure that there is always enough mud to support the drilling operation.

9. The construction method according to claim 6, characterized in that: In step 4, the components of the modular construction platform for ultra-long underwater pile foundation impact drilling include a lower support hoop (10), an upper support hoop (11), a rib plate (12), a lower cross bar (13), an upper cross bar (14), a V-shaped web member (15), an oblique web member (16), a Bailey beam (7), a distribution beam (8), a steel panel (6) and a guardrail (5).

10. The construction method according to claim 6, characterized in that: In step 1, the locations and quantities of the steel pipe piles (1) of the steel trestle (20) are determined according to actual engineering requirements to ensure the stability and bearing capacity of the steel trestle (20).

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