Underwater steel pipe pile construction method of deepwater bare rock shipborne punching machine

Abstract

The invention belongs to the technical field of bridge construction, and particularly relates to a deepwater bare rock shipborne punching machine underwater steel pipe pile construction method which comprises the specific steps that S1, combined shipborne impact hole guiding and cleaning integrated equipment is designed; s2, ship body displacement; s3, lowering the steel casing; s4, punching is conducted; s5, hole cleaning; s6, measuring the hole depth; s7, the steel casing is lifted; s8, inserting and driving steel pipe piles; and S9, checking and accepting. The thought that a load source, namely punching equipment, is separated from the trestle is adopted, the problem that the trestle is prone to being damaged by repeated loads in the hole guiding process is solved, the hole guiding procedure and the steel pipe pile inserting and driving procedure are changed into parallel construction from flow construction, the hole guiding operation efficiency of the steel trestle and the steel platform steel pipe pile is greatly improved, and the construction period is shortened. The construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to an underwater steel pipe pile construction method of a deep-water bare rock ship-borne punching machine. Background Art

[0002] In recent years, with the rapid development of expressway construction in my country, extra-large bridges across large rivers, bays, and straits have continued to emerge. Steel trestles and steel platforms are increasingly used in engineering projects as transportation channels for bridge construction materials and equipment and temporary construction sites on water.

[0003] However, in the construction of steel trestles and steel platforms in deep-water bare rock geological environments, the steel pipe piles cannot be driven into the rock layer and must be driven into the rock through the drilling method; the traditional drilling method is to build span by span and drill holes by span, which has the defect that the construction can only be continued after the drilling holes are completed, which has a great impact on the construction period, and the drilling equipment is set at the cantilever end, which requires the strength of the trestles to meet the requirements, but the continuous and repeated lifting of the drill bit and the repeated action of the load applied to the trestles at a certain frequency can easily cause metal fatigue damage. At the same time, the traditional drilling method lacks a hole cleaning method that matches the clean water drilling method, resulting in the inability to clean the sediment in the hole, which seriously affects the efficiency of the drilling method and the final depth of the hole. The sediment in the hole is mostly the sediment after the rock is crushed. Generally, mud circulation is used for hole cleaning, but due to the influence of on-site construction conditions, a series of related work such as mud production, sedimentation tank, mud pool, and mud discharge are difficult to complete. Moreover, the use of mud circulation to clean the hole is likely to cause environmental problems such as river water pollution. The construction method of setting up span-by-span access holes is not a good solution in terms of construction period, safety and environmental protection.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The present invention aims to solve the above-mentioned technical problems and provides an underwater steel pipe pile construction method using a deep-water bare rock ship-borne punching machine. The method adopts the idea of ​​separating the load source, i.e., the punching equipment, from the pier, which not only solves the problem that the pier is easily damaged by repeated loads during the hole-drawing process, but also changes the hole-drawing process and the steel pipe pile driving process from continuous construction to parallel construction, thereby greatly improving the hole-drawing operation efficiency of steel pipe piles on steel trestles and steel platforms and saving construction time.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A method for constructing underwater steel pipe piles using a deep-water bare rock ship-borne punching machine comprises the following steps:

[0008] S1. Design and manufacture ship-borne integrated impact hole-guiding and hole-cleaning equipment;

[0009] The ship-borne impact hole-guiding and hole-cleaning integrated equipment comprises a hull, a punching machine, a gantry, a steel casing guide frame and an air compressor. The punching machine, the gantry and the air compressor are all arranged on the hull, and the steel casing guide frame is arranged on the hull below the gantry;

[0010] S2, hull displacement;

[0011] After the ship-borne impact hole-guiding and hole-cleaning integrated equipment is assembled, it is anchored. A total of 4 anchor points are set, 3m away from the four corners of the hole-guiding working surface area. The winches at the four corners of the hull can control the hull to move in the full range of the working surface area;

[0012] Use RTK to guide the pile position according to the design, and use this as a basis to command the hull to move to the pile position. After moving to the position, slowly adjust the tightness of the wire ropes to keep all four wire ropes in a tightened state to prevent large displacement during the punching process;

[0013] S3, lowering the steel casing;

[0014] Use the crawler crane on the steel trestle to hoist the steel casing to the gantry and lower it, and use the vertical hand chain hoist on the gantry and the auxiliary hook of the punching machine to loosen the hook of the crawler crane to transfer the steel casing to the hull, and adjust the vertical position and longitudinal position of the steel casing respectively through the vertical hand chain hoist and the longitudinal hand chain hoist on the gantry. The lifting point of the steel casing on the gantry is far away from the bow, and the hammer lifting point of the punching machine is close to the bow. When the longitudinal hand chain hoist connected to the steel casing is loosened, the steel casing automatically moves away from the bow.

[0015] Use GPS positioning to determine the pile position, adjust the anchor rope tension through the winches at the four corners of the hull to adjust the hull position and fix the hull, so that the center of the punching machine hammer is directly above the pile position, adjust the vertical hand chain hoist and the longitudinal hand chain hoist to align the center of the steel casing with the center of the punching machine hammer, and start lowering the steel casing to the riverbed. After the steel casing is lowered and touches the riverbed, it uses its own weight to embed into the rock;

[0016] The steel casing is fixed by using a steel casing guide frame;

[0017] S4, punching;

[0018] Punching is done with a punching machine. The diameter of the punching hammer is smaller than that of the steel pipe pile. A 3m-4m stroke is used. When the punching speed drops significantly, it means that there is a lot of debris at the bottom of the hole. When it is no longer possible to maintain efficient punching, the hole is cleaned to remove the stone chips in the hole.

[0019] S5, hole cleaning;

[0020] The hole cleaning adopts the air lift principle, using an air compressor to connect high-pressure gas to the bottom of the steel casing through the air pipe. The air mixed with liquid moves upward quickly, forming a negative pressure at the bottom of the pipe, and the rock cuttings at the bottom of the hole are continuously sucked out. After the hole is cleaned, a hanging hammer should be used to knock the bottom of the hole to ensure that there is no thick sediment at the bottom of the hole.

[0021] S6, measure hole depth;

[0022] After the hole is cleaned, the depth of the hole is measured with a measuring rope to determine whether it meets the design requirements. If it does, the hole can be drilled to the end, otherwise it should continue to be drilled;

[0023] S7, steel casing lifting;

[0024] When the hole depth meets the design requirements, use the vertical hand chain hoist on the gantry to slowly lift the steel casing so that it is more than 1m away from the riverbed surface, and then move the hull to the next hole-drawing point according to step S2;

[0025] S8, inserting and driving steel pipe piles;

[0026] Use crawler crane to lift the vibrating hammer, clamp the steel pipe pile with the vibrating hammer, and drive the steel pipe pile into the hole after the lead hole. Record the insertion depth during the driving process, check and accept the coordinates of the steel pipe pile through the total station, and confirm the rock embedding depth and bottoming condition of the steel pipe pile by checking the driving record. During the vibration sinking process of the steel pipe pile, when the driving depth is in place and the sinking rate is less than 1cm / min and there is no change after repeating 3 times, it means that the steel pipe pile has been driven firmly.

[0027] S9. Inspection and acceptance;

[0028] The coordinates of the steel pipe piles are reviewed and accepted by the total station, and the rock embedding depth and bottom contact of the steel pipe piles are confirmed by checking the driving records to complete the acceptance work.

[0029] Preferably, in step S2,

[0030] The gantry is made of double I-beams, with a length of 4m, a width of 3.65m and a height of 3.4m.

[0031] The double-jointed I-beam is spliced ​​by upper and lower flange plate jump welding, the weld length is 10cm, the weld spacing is 1m, and the vertical rods, diagonal rods, horizontal rods, steel plates and stiffening plates are fully welded.

[0032] There are two vertical hand chain hoists, and the distance between the two vertical hand chain hoists' hanging points is 60cm.

[0033] Preferably, in step S2,

[0034] The steel casing guide frame is formed by splicing I-beams, the steel casing is clamped between two I-beams, and one end of the I-beam away from the steel casing is welded to the hull.

[0035] Preferably, in step S2,

[0036] The steel casing is provided with reserved holes for passing steel rods at vertical intervals of 2m. The diameter of the reserved holes for passing steel rods is 10cm. They are used for temporary support when the steel casing is extended. The steel casing can be lifted into the steel casing guide frame and the steel pipe can be passed through the reserved holes for passing steel rods to install the steel casing on the steel casing guide frame.

[0037] Preferably, the bottom of the steel casing is configured as a serrated structure.

[0038] Preferably, a gas delivery pipe joint is provided 1 m away from the bottom of the steel casing for connecting the gas delivery pipe of the air compressor.

[0039] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0040] 1. The present invention provides an underwater steel pipe pile construction method for a deep-water bare rock ship-borne punching machine. The method adopts the idea of ​​separating the load source, i.e., the punching equipment, from the trestle, and transferring the steel pipe pile hole-guiding operation surface from the steel trestle to the ship, so that the process arrangement is more flexible. It not only solves the problem that the trestle is easily damaged by repeated loads during the hole-guiding process, but also changes the hole-guiding process and the steel pipe pile driving process from continuous construction to parallel construction, which greatly improves the hole-guiding operation efficiency of the steel trestle and steel platform steel pipe piles, and can arrange other processes of the trestle construction more flexibly, shortening the overall construction period of the steel trestle, and correspondingly reducing the manpower and machinery costs caused by the shortened construction period.

[0041] 2. The present invention has the effect of accelerating the construction progress. Different from the traditional flow construction process of first building a trestle and then building steel pipe piles, in this method, the steel casing adopts the on-board hole-guiding technology, which can realize the parallel operation of the steel casing and the trestle erection, greatly shortening the construction period of the steel trestle.

[0042] 3. The present invention has the effect of improving the quality of hole formation. After punching, high-pressure gas is used to form negative pressure at the bottom of the steel casing using the gas lift principle. The gas mixed liquid and rock debris after punching are continuously discharged from the top of the steel casing, which effectively reduces the thickness of the rock debris at the bottom of the hole and the punching resistance, which is conducive to the continuous punching of the hammer and ensures that the hole depth meets the design requirements.

[0043] 4. Traditional mud circulation hole cleaning technology is often accompanied by mud discharge problems, which brings potential pollution risks to the surrounding environment, especially the nearby rivers. This method uses air lift reverse circulation hole cleaning to replace conventional mud circulation hole cleaning, which not only improves the hole cleaning efficiency, but also fundamentally eliminates the possibility of mud being directly discharged into the natural environment, thereby effectively avoiding the pollution of river water quality caused by mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the present invention;

[0045] Figure 2 It is a front view of the present invention;

[0046] Figure 3 It is a construction process flow chart of the present invention;

[0047] Figure 4 This is a schematic diagram of step S2 of the present invention;

[0048] Figure 5 On-site implementation of the test example of the present invention Figure 1 ;

[0049] Figure 6 On-site implementation of the test example of the present invention Figure 2 .

[0050] The main component symbols in the figure are explained as follows:

[0051] 100. Hull; 200. Punching machine; 300. Gantry; 400. Steel casing guide frame; 500. Steel casing. DETAILED DESCRIPTION

[0052] The following will be combined with the 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 without creative work are within the scope of protection of the present invention.

[0053] Example

[0054] like Figures 1 to 6 As shown, a method for constructing underwater steel pipe piles with a deep-water bare rock ship-borne punching machine comprises the following steps:

[0055] S1. Design and manufacture ship-borne integrated impact hole-guiding and hole-cleaning equipment;

[0056] The shipborne impact hole-guiding and hole-cleaning integrated equipment comprises a hull 100, a punching machine 200, a gantry 300, a steel casing guide frame 400 and an air compressor (not shown in the figure). The punching machine 200, the gantry 300 and the air compressor are all arranged on the hull 100, and a steel casing guide frame 400 is arranged on the hull 100 below the gantry 300;

[0057] S2, hull displacement 100;

[0058] After the ship-borne impact hole-guiding and hole-cleaning integrated equipment is assembled, it is anchored. A total of 4 anchor points are set, which are set 3m outside the four corners of the hole-guiding working surface area. Through the winches at the four corners of the hull 100, the hull 100 can be controlled to move in the full range of the working surface area, such as Figure 4 As shown;

[0059] The pile position is guided by RTK according to the design, and the ship 100 is directed to move to the pile position based on this. After moving to the position, the tightness of the steel wire rope is slowly adjusted to make the four steel wire ropes in a tightened state to prevent large displacement during the punching process;

[0060] S3, lower the steel casing 500;

[0061] The steel casing 500 is hoisted to the gantry 300 and lowered by the crawler crane on the steel trestle, and the vertical hand chain hoist on the gantry 300 and the auxiliary hook of the punching machine 200 are used to release the hook of the crawler crane to transfer the steel casing 500 to the hull 100. The vertical position and the longitudinal position of the steel casing 500 are adjusted respectively by the vertical hand chain hoist and the longitudinal hand chain hoist on the gantry 300. The lifting point of the steel casing 500 on the gantry 300 is far away from the bow, and the hammer lifting point of the punching machine 200 is close to the bow. When the longitudinal hand chain hoist connected to the steel casing 500 is released, the steel casing 500 automatically moves away from the bow.

[0062] The pile position is determined by using GPS positioning, and the anchor rope is adjusted by the winches at the four corners of the hull 100 to adjust the position of the hull and fix the hull, so that the center of the punching machine 200 is directly above the pile position, and the vertical hand chain hoist and the longitudinal hand chain hoist are adjusted to align the center of the steel casing 500 with the center of the punching machine 200, and the steel casing 500 is lowered to the riverbed. After the steel casing 500 is lowered and contacts the riverbed, it is embedded in the rock by its own weight;

[0063] The steel casing 500 is fixed by using the steel casing guide frame 400; the steel casing 500 mainly plays the role of positioning the bottom of the hole and guiding the drill bit;

[0064] S4, punching;

[0065] Punching machine 200 is used for punching. The hammer diameter of punching machine 200 is smaller than that of steel pipe pile. A stroke of 3m-4m is used. When the punching speed drops significantly, it means that there are a lot of debris at the bottom of the hole. When it is no longer possible to maintain high-efficiency punching, the hole is cleaned to remove the stone debris in the hole.

[0066] S5, hole cleaning;

[0067] The hole cleaning adopts the air lift principle. The air compressor is used to connect the high-pressure gas to the bottom of the steel casing 500 through the air pipe. The air mixed with the liquid moves upward quickly, forming a negative pressure at the bottom of the pipe, and the rock cuttings at the bottom of the hole are continuously sucked out. After the hole is cleaned, the bottom of the hole should be knocked with a hanging hammer to ensure that there is no thick sediment at the bottom of the hole.

[0068] S6, measure hole depth;

[0069] After the hole is cleaned, the depth of the hole is measured with a measuring rope to determine whether it meets the design requirements. If it does, the hole can be drilled to the end, otherwise it should continue to be drilled;

[0070] S7, steel casing 500 lifting;

[0071] When the hole depth meets the design requirements, the vertical hand chain hoist on the gantry 300 is used to slowly lift the steel casing 500 so that it is more than 1m away from the riverbed surface, and the hull 100 can be moved to the next hole-drawing point according to step S2;

[0072] S8, inserting and driving steel pipe piles;

[0073] Use crawler crane to lift the vibrating hammer, clamp the steel pipe pile with the vibrating hammer, and drive the steel pipe pile into the hole after the lead hole. Record the insertion depth during the driving process, check and accept the coordinates of the steel pipe pile through the total station, and confirm the rock embedding depth and bottoming condition of the steel pipe pile by checking the driving record. During the vibration sinking process of the steel pipe pile, when the driving depth is in place and the sinking rate is less than 1cm / min and there is no change after repeating 3 times, it means that the steel pipe pile has been driven firmly.

[0074] S9. Inspection and acceptance;

[0075] The coordinates of the steel pipe piles are reviewed and accepted by the total station, and the rock embedding depth and bottom contact of the steel pipe piles are confirmed by checking the driving records to complete the acceptance work.

[0076] The present invention adopts the idea of ​​separating the load source, i.e. the punching equipment, from the trestle, which not only solves the problem that the trestle is easily damaged by repeated loads during the hole-drawing process, but also changes the hole-drawing process and the steel pipe pile driving process from flow construction to parallel construction, greatly improving the efficiency of the steel trestle and steel platform steel pipe pile hole-drawing operation and saving construction time.

[0077] In this embodiment, in step S2, the gantry 300 is made of double-jointed I-beams, which are 4m long, 3.65m wide and 3.4m high. The double-jointed I-beams are joined by upper and lower flange plate jump welding. The weld length is 10cm and the weld spacing is 1m. Full welding is used between the vertical bars, diagonal bars, horizontal bars, steel plates and stiffening plates. Two vertical hand hoists are provided, and the spacing between the two vertical hand hoists' hanging points is 60cm; the specific design of the spacing between the vertical hand hoists' hanging points needs to match the size of the steel casing 500.

[0078] In this embodiment, in step S2, the steel casing guide frame 400 is spliced ​​by I-beams, the steel casing 500 is clamped between two I-beams, and the end of the I-beam away from the steel casing 500 is welded to the hull 100; the steel casing guide frame 400 limits the displacement of the upper end of the steel casing 500 to prevent it from shaking left and right and affecting the drilling operation.

[0079] In this embodiment, in step S2,

[0080] The steel casing 500 is provided with reserved holes for passing steel rods at vertical intervals of 2m. The diameter of the reserved holes for passing steel rods is 10cm, and they are used for temporary support when the steel casing 500 is extended. The steel casing 500 can be erected on the steel casing guide frame 400 by lifting the steel casing 500 into the steel casing guide frame 400 and passing the steel pipe through the reserved holes for passing steel rods.

[0081] The steel casing 500 adopts a 630×9mm Q235 steel pipe, and its main function is hole positioning and drill bit guidance. For the different depths of the riverbed below, the steel casing 500 should have an adjustable length function, and the length can be extended; the specific extension design of the steel casing is as described above, 20cm from the top of the steel casing 500, every 2m is set with a reserved hole for steel rod holes, and the hole diameter is 10cm; the steel casing 500 is lifted to the reserved hole for steel rod holes higher than the guide frame 400, and the steel pipe is passed through the reserved hole for steel rod holes, and the steel casing 500 can be temporarily erected on the guide frame 400, so as to subsequently release the hand chain hoist lifting point, and use the hand chain hoist to lift the extension section to the top of the steel casing 500 to extend the steel casing 500, and the extension adopts four 10cm×20cm×1cm steel plates fully welded around the joint of the two sections.

[0082] In this embodiment, the bottom of the steel casing 500 is set to a serrated structure; the serrated structure makes it easy for the steel casing 500 to embed into the rock and prevents the bottom of the casing from sliding; during specific operation, the depth of the sawtooth is not less than 5 cm. First, a slate pencil is used to draw a serrated shape on the steel casing 500, and oxygen cutting is used to cut according to the drawn lines. In order to ensure the sharpness of the sawtooth, increase the pressure on the rock, and better embed into the rock, the sawtooth head needs to be sharpened.

[0083] In this embodiment, a gas delivery pipe joint is provided 1m away from the bottom of the steel casing 500 for connecting the gas pipe of the air compressor; during the specific operation, a handheld electric drill is used to drill a hole in the side wall of the steel casing according to the diameter of the joint, and the joint is inserted into the hole and fully welded to prevent air leakage.

[0084] Test example

[0085] See also Figure 5 and Figure 6The present invention provides a method for constructing underwater steel pipe piles with a deep-water bare rock ship-borne punching machine, which is applied to the No. 1 section of the S514 Nanning Jiangxi to Tanluo Highway. The steel trestle and steel platform of the Zhongleng Zuojiang Bridge have a total of 132 steel pipe piles, all of which are located on the exposed hard rock riverbed, and there is no covering layer on the rock surface.

[0086] The steel trestle and steel platform of the Zhongleng Zuojiang Bridge in Section 1 of the S514 Nanning Jiangxi to Tanluo Highway have a total of 132 steel pipe piles, all located on the exposed hard rock riverbed, with no covering layer on the rock surface. The steel trestle and steel platform started construction on March 20, 2024 and were completed on May 25, 2024, with a construction period of 67 days. The use of this method has accelerated the construction progress, saved 30 days of construction time, and achieved good application results. It is worthy of promotion and application for the subsequent steel trestle construction under similar engineering geological conditions. The specific economic and social benefits are analyzed as follows;

[0087] Benefit Analysis

[0088] (1) Economic Benefits

[0089] Compared with the traditional construction method, the underwater steel pipe pile construction method using a ship-borne punching machine changes the hole-guiding process into a non-critical line process, changes the logical relationship of the process, and changes the flow construction into parallel construction. The hole-guiding process is completed in advance and does not occupy the total construction period of the trestle. The construction of each steel pipe pile can save 0.24 days of construction time. Taking the No. 1 section of the S514 Nanning Jiangxi to Tanluo Highway project as an example, there are 132 piles, which saves a total of about 30 days of construction time.

[0090] At the same time, compared with the traditional construction method, the ship amortization fee for one month is increased by 2,000 yuan, the integrated equipment processing fee is increased by 3,000 yuan, the 50t crawler crane rental fee for one month is reduced by 48,000 yuan, and the labor cost for one month (8 people) is reduced by 72,000 yuan. This method can ultimately save 48,000 + 72,000 - 0.2 - 0.3 = 115,000 yuan.

[0091] (4) Social benefits

[0092] The ship-borne punching machine is used for underwater steel pipe pile construction. Compared with the traditional construction method, the punching equipment is used to guide the hole, which ensures the rock layer implantation depth of the steel pipe pile. The air lift reverse circulation is used to clean the hole, and the bottom of the hole is cleaned more thoroughly. The problem of the difficulty in constructing steel pipe piles for steel trestle under hard rock geological conditions is solved. Compared with the traditional mud circulation drilling slag process, the air lift reverse circulation is used to clean the hole to avoid water pollution, which is a green and environmentally friendly process.

[0093] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A method for constructing underwater steel pipe piles using a deep-water bare rock ship-borne punching machine, characterized in that: The following steps are involved: S1. Design and manufacture ship-borne integrated impact hole-guiding and hole-cleaning equipment; The ship-borne integrated impact hole-guiding and hole-cleaning equipment comprises a hull (100), a punching machine (200), a gantry (300), a steel casing guide frame (400) and an air compressor. The punching machine (200), the gantry (300) and the air compressor are all arranged on the hull (100), and the steel casing guide frame (400) is arranged on the hull (100) below the gantry (300); S2, displacement of the hull (100); After the ship-borne impact hole-guiding and hole-cleaning integrated equipment is assembled, it is anchored, and a total of 4 anchor points are set, which are respectively set 3m outside the four corners of the hole-guiding working surface area. Through the winches at the four corners of the hull (100), the hull (100) can be controlled to move in the full range of the working surface area; The pile position is guided according to the design by using RTK, and the ship body (100) is directed to move to the pile position based on this. After moving to the position, the tightness of the steel wire ropes is slowly adjusted so that the four steel wire ropes are all in a tightened state to prevent large displacement during the punching process; S3, lowering the steel casing (500); The steel casing (500) is hoisted to the gantry (300) and lowered by using the crawler crane on the steel trestle, and the vertical hand chain hoist on the gantry (300) and the auxiliary hook of the punching machine (200) are used to release the hook of the crawler crane to transfer the steel casing (500) to the hull (100), and the vertical position and longitudinal position of the steel casing (500) are adjusted respectively by the vertical hand chain hoist and the longitudinal hand chain hoist on the gantry (300). The lifting point of the steel casing (500) on the gantry (300) is far away from the bow of the ship, and the hammer lifting point of the punching machine (200) is close to the bow of the ship. When the longitudinal hand chain hoist connected to the steel casing (500) is released, the steel casing (500) automatically moves away from the bow of the ship; The pile position is determined by using GPS positioning, the anchor rope is adjusted by winches at four corners of the hull (100) to adjust the position of the hull (100) and fix the hull (100) so that the center of the punching machine (200) is directly above the pile position, the vertical hand chain hoist and the longitudinal hand chain hoist are adjusted so that the center of the steel casing (500) is aligned with the center of the punching machine (200), and the steel casing (500) is lowered to the riverbed. After the steel casing (500) contacts the riverbed, it is embedded in the rock by its own weight; The steel casing (500) is fixed by using a steel casing guide frame (400); S4, punching; A punching machine (200) is used for punching. The diameter of the punching hammer of the punching machine (200) is smaller than that of the steel pipe pile. A 3m-4m stroke is used. When the punching speed drops significantly, it indicates that a large amount of debris is stored at the bottom of the hole. When it is no longer possible to continue to punch efficiently, a hole cleaning process is performed to remove stone debris in the hole. S5, hole cleaning; The hole cleaning adopts the air lift principle, using an air compressor to connect high-pressure gas to the bottom of the steel casing (500) through the air pipe. The air mixed with liquid moves upward quickly, forming a negative pressure at the bottom of the pipe, and the rock cuttings at the bottom of the hole are continuously sucked out. After the hole is cleaned, a hanging hammer should be used to knock the bottom of the hole to ensure that there is no thick sediment at the bottom of the hole. S6, measure hole depth; After the hole is cleaned, the depth of the hole is measured with a measuring rope to determine whether it meets the design requirements. If it does, the hole can be drilled to the end, otherwise it should continue to be drilled; S7, steel casing (500) lifting; When the hole depth meets the design requirements, the steel casing (500) is slowly lifted up by the vertical hand chain hoist on the gantry (300) to make it more than 1m away from the riverbed surface, and the hull (100) can be moved to the next hole-drawing point according to step S2; S8, inserting and driving steel pipe piles; Use crawler crane to lift the vibrating hammer, clamp the steel pipe pile with the vibrating hammer, and drive the steel pipe pile into the hole after the lead hole. Record the insertion depth during the driving process, check and accept the coordinates of the steel pipe pile through the total station, and confirm the rock embedding depth and bottoming condition of the steel pipe pile by checking the driving record. During the vibration sinking process of the steel pipe pile, when the driving depth is in place and the sinking rate is less than 1cm / min and there is no change after repeating 3 times, it means that the steel pipe pile has been driven firmly. S9. Inspection and acceptance; The coordinates of the steel pipe piles are reviewed and accepted by the total station, and the rock embedding depth and bottom contact of the steel pipe piles are confirmed by checking the insertion records to complete the acceptance work.

2. The method for constructing underwater steel pipe piles using a deep-water bare rock ship-borne punching machine as claimed in claim 1, characterized in that: In step S2, The gantry (300) is formed by splicing two I-beams, and has a length of 4 m, a width of 3.65 m, and a height of 3.4 m. The double-jointed I-beam is spliced ​​by upper and lower flange plate jump welding, the weld length is 10cm, the weld spacing is 1m, and the vertical rods, diagonal rods, horizontal rods, steel plates and stiffening plates are fully welded. There are two vertical hand chain hoists, and the distance between the two vertical hand chain hoists' hanging points is 60cm.

3. The method for constructing underwater steel pipe piles with a deep-water bare rock ship-borne punching machine as claimed in claim 1, characterized in that: In step S2, The steel casing guide frame (400) is formed by splicing I-beams, the steel casing (500) is clamped between two I-beams, and one end of the I-beam away from the steel casing (500) is welded to the hull (100).

4. The method for constructing underwater steel pipe piles with a deep-water bare rock ship-borne punching machine as claimed in claim 1, characterized in that: In step S2, The steel casing (500) is provided with reserved holes for steel rods at vertical intervals of 2 m. The diameter of the reserved holes for steel rods is 10 cm and is used to provide temporary support when the steel casing (500) is extended. The steel casing (500) is lifted into the steel casing guide frame (400) and a steel pipe is passed through the reserved holes for steel rods, so that the steel casing (500) can be mounted on the steel casing guide frame (400).

5. The method for constructing underwater steel pipe piles with a deep-water bare rock ship-borne punching machine as claimed in claim 4, characterized in that: The bottom of the steel casing (500) is configured as a sawtooth structure.

6. The method for constructing underwater steel pipe piles with a deep-water bare rock ship-borne punching machine as claimed in claim 4, characterized in that: A gas delivery pipe joint is provided at a position 1 m away from the bottom of the steel casing (500) for connecting the gas delivery pipe of the air compressor.

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