A floating gantry boat for removing steel pipe pile supports at the bottom of low-headroom beams

Abstract

The present invention is applicable to steel pipe pile extraction and provides a floating gantry boat for extracting steel pipe pile supports at the bottom of a low-headroom lower beam, comprising a steel pipe pile inserted into the bottom of a silt layer, a floating gantry boat, and a winch assembly mounted on the floating gantry boat; a circle of reinforcing ribs is welded at the pipe mouth of the steel pipe pile; and further comprising: a connector for fixing the steel pipe pile; and a first steel wire rope for connecting the winch assembly and the connector; a first rope guide member threadedly arranged on a screw rod; a fixing member fixedly mounted on a semi-circular plate by a tightening bolt; a second rope guide member rotatably arranged on the fixing member; and a counterweight member rotatably arranged on the fixing member and the connecting member. The device ensures that the force direction of the steel wire rope coincides with the axial direction of the steel pipe pile by fixing the connecting member to the steel pipe pile and adjusting the counterweight member on the second dial through the first dial, thereby ensuring that the pulling angle is consistent with the angle of the steel pipe pile to be extracted, thereby facilitating the extraction of steel pipe piles tilted in the silt layer.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe pile extraction, and more particularly to a floating gantry vessel for extracting steel pipe pile supports at the bottom of a low-headroom lower beam. Background Art

[0002] In the existing technology, underwater steel pipe piles are generally removed from the top of the steel pipe pile using lifting equipment in combination with a vibrating hammer. The principle is to vibrate the pile to be pulled out using the vibration equipment and simultaneously apply an upward pulling force to it using the lifting equipment. The sufficient vibration loosens and liquefies the soil around the steel pipe pile, reducing the soil friction resistance. When the friction force is less than the upward pulling force, the steel pipe pile can be pulled out. However, under low clearance, large floating cranes on water cannot enter the bottom of the bridge for construction.

[0003] After searching, the publication number CN217870473U is a hydraulic pile pulling device for confined space, including a floating boat and a hydraulic lift arranged on the floating boat, a lifting station is formed on the floating boat, the hydraulic lifts are relatively arranged on both sides of the lifting station, and the tops of the two hydraulic lifts are provided with connected lifting brackets; the lifting brackets are provided with relatively arranged slings, and the relatively arranged slings are arranged on both sides of the lifting station; a lifting hoop is connected between the relatively arranged slings, and a sitting hoop is provided on the floating boat, and the sitting hoop is located below the lifting hoop, and the lifting hoop and the sitting hoop both correspond to the position of the lifting station; compared with the existing technology, through the setting of the floating boat and the hydraulic lift, it is possible to realize the removal of steel pipe piles when conventional lifting equipment cannot carry out construction in situations where the clearance at the top of the steel pipe piles is insufficient or the water depth is insufficient and large ships cannot enter, such as at the bottom of a newly built bridge.

[0004] However, in actual sites, underwater steel pipe piles are sometimes inserted at an angle into the silt layer. The hydraulic pile pulling device adjusts the angles of the hydraulic lifter and the lifting bracket by rotating the hydraulic cylinder to ensure that the angles of the hydraulic lifter and the lifting bracket are consistent with the angle of the steel pipe pile to be pulled out. This operation is difficult and the investment cost is high. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method of fixing a connecting piece on a steel pipe pile and adjusting the counterweight on the second dial through a first dial, thereby ensuring that the force direction of the wire rope coincides with the axial direction of the steel pipe pile, ensuring that the pulling angle is consistent with the angle of the steel pipe pile to be pulled out, and facilitating the pulling out of the steel pipe piles that are inclined in the silt layer, replacing the traditional method of adjusting the angle of the hydraulic lifter and the lifting bracket by rotating the hydraulic cylinder, which is simple to operate and reduces investment costs.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A floating gantry boat for removing steel pipe pile supports at the bottom of a low-headroom lower beam comprises a steel pipe pile obliquely inserted into the bottom of a silt layer, a floating gantry boat, and a winch assembly hung on the floating gantry boat; a circle of reinforcing ribs are welded at the pipe mouth of the steel pipe pile; further comprising: a connector for fixing the steel pipe pile; and a first steel wire rope for connecting the winch assembly and the connector; the winch assembly comprises: a fixed plate, vertical plates symmetrically arranged on the surface of the fixed plate; a semi-annular plate is arranged on the bottom surface of the fixed plate; a wire rope arranged between the two vertical plates is rotated through the winch assembly Rod; a first guide rope member threadedly arranged on the screw rod; a fixing member fixedly installed on the semi-annular plate by a fastening bolt; and a second guide rope member rotated on the fixing member; and a counterweight member respectively rotated on the fixing member and the connecting member; the first steel wire rope is wound on the winch assembly, and one end thereof passes through the first guide rope member and the second guide rope member in sequence and is connected to the connecting member; the second guide rope member is rotated according to the angle of the counterweight member on the first dial to ensure that the force direction of the first steel wire rope coincides with the axis direction of the steel pipe pile.

[0008] The present invention is further configured as follows: the first rope guide member includes a slide plate threadedly arranged on a screw rod; the slide plate is slidably engaged with a side surface of a fixed plate; a first guide pulley is symmetrically arranged on a side surface of the slide plate.

[0009] The present invention is further configured as follows: the fixing member includes an arc-shaped sleeve slidably arranged on the semi-annular plate, and mounting holes are provided on the side of the arc-shaped sleeve and the semi-annular plate; the arc-shaped sleeve and the semi-annular plate are fixedly connected by fastening bolts.

[0010] The present invention is further configured as follows: the connecting piece includes two mounting plates; a support rod is symmetrically arranged between the two mounting plates; a vibrating hammer is arranged between the two mounting plates; an ear plate is arranged on the side of the vibrating hammer; a first scale plate is fixedly connected to the side of the ear plate; a semi-connecting tube is provided on the surface of one of the mounting plates, and a lifting lug for hanging a first steel wire rope is provided on its surface inside the semi-connecting tube; a second steel wire rope is symmetrically hung below one of the mounting plates; and both ends of the second steel wire rope are connected to a clamp.

[0011] The present invention is further configured as follows: the counterweight includes a rotating sleeve; a connecting rod is provided on the peripheral side of the rotating sleeve; a counterweight ball is provided on the end of the connecting rod; a rotating shaft is provided on the side of the arc-shaped sleeve; the rotating sleeves on the two counterweights are respectively rotatably matched with the side of the first dial and the rotating shaft.

[0012] The present invention is further configured as follows: a connecting shaft is provided on the side of the arc-shaped sleeve; a limit plate is slidably provided on the connecting shaft; positioning posts are distributed in a circular array on the side of the limit plate; the second rope guide member includes a second scale plate; the side of the second scale plate is provided with positioning holes that are plugged into and cooperate with the positioning posts; second guide pulleys are symmetrically rotated on the side of the second scale plate, and a wire threading tube is provided on its side just below the two second guide pulleys; a connecting sleeve that is rotatably cooperated with the connecting shaft is provided on the other opposite side of the second scale plate.

[0013] The present invention is further configured as follows: a limit plate is provided on the side of the arc-shaped sleeve; sliding rods are symmetrically provided on the side of the limit plate; the limit plate is slidably provided on the two sliding rods; a support plate is provided on the peripheral side of the arc-shaped sleeve; a screw is rotatably provided on the side of the support plate; one end of the screw is rotatably provided on the side of the limit plate.

[0014] The present invention is further configured as follows: a winding roller is rotatably arranged above the screw rod between the two vertical plates; an upper pulley and a lower pulley are sequentially arranged on the ends of the winding roller and the screw rod; a belt is provided for transmission between the upper pulley and the lower pulley; a driving motor is installed on the side of the vertical plate; and the output end of the driving motor is fixedly connected to the winding roller.

[0015] The present invention is further configured as follows: the floating gantry ship includes a load-bearing beam; a slide trolley is slidably arranged on the load-bearing beam; the two vertical plates are fixedly installed at the bottom of the slide trolley; steel pipe columns are symmetrically arranged on the bottom surface of the load-bearing beam; an installation platform is arranged on the bottom surface of the steel pipe columns; and a standard boat section is provided at the bottom of each installation platform.

[0016] The advantages of the present invention are:

[0017] 1. The present invention moves the floating gantry boat to the specified position, welds a circle of reinforcing ribs at the pipe mouth, fixes the clamp to the side surface of the steel pipe pile below the reinforcing ribs by tightening bolts, and loosens the steel pipe pile by a vibrating hammer, so that the soil at the root of the steel pipe pile is liquefied, the friction is reduced, and the strength at the pipe mouth is increased. The assembly process is simple and the work efficiency is improved. Compared with large-scale floating cranes on the water, the floating gantry pile pulling boat can save energy, reduce costs and increase efficiency. The floating gantry boat modular structure is flexible and changeable, and the assembly is simple and fast. The structure is stable and safe, which solves the problem that large-scale floating cranes on the water cannot enter the bottom of the bridge for construction under low clearance.

[0018] 2. After the vibratory hammer loosens the steel pipe pile, the present invention stops the operation of the vibratory hammer. Under the action of gravity, the counterweight ball on the first dial always points vertically downward. The angle a on the first dial is read, and the angle b between the angle and the axis of the steel pipe pile is (90°-a). Under the action of gravity, the counterweight ball on the second dial always points vertically downward. The second rope guide is rotated along the rotating shaft so that the threading tube and the semi-connecting tube are coaxially arranged, so that the angle between the first steel wire rope passing through the threading tube and the second dial is b, which ensures that the force direction of the first steel wire rope coincides with the axis direction of the steel pipe pile, ensures that the pulling angle is consistent with the angle of the steel pipe pile to be pulled out, and facilitates the pulling out of the steel pipe pile inclined in the silt layer. It replaces the traditional method of adjusting the angle of the hydraulic lifter and the lifting bracket by rotating the hydraulic cylinder, is simple to operate, and reduces investment costs.

[0019] 3. The present invention starts the driving motor to drive the lower pulley to rotate, and cooperates with the belt to drive the upper pulley to rotate, thereby driving the synchronous rotation of the winding roller and the screw rod, and then the first rope guide guides the outgoing wire rope on the winding roller to ensure that the outgoing direction of the wire rope is always vertically downward, which is convenient for the normal winding and unwinding of the winding roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to the present invention;

[0021] Figure 2 It is a structural schematic diagram of the hoisting component and the fixing member assembly of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the hoisting assembly of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the connecting piece of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the first guide rope member of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the fixing member of the present invention;

[0026] Figure 7 A schematic structural diagram of the fixing member of the present invention from another angle;

[0027] Figure 8 Schematic diagram of the structure of the second rope guide member of the present invention;

[0028] Figure 9 A schematic structural diagram of the second rope guide member of the present invention from another angle;

[0029] Figure 10 It is a structural schematic diagram of the counterweight of the present invention;

[0030] Figure 11 For the present invention Figure 1 A magnified schematic diagram of area A;

[0031] Figure 12 For the present invention Figure 1 A magnified schematic diagram of area B;

[0032] Figure: 1. Steel pipe pile; 2. Floating gantry boat; 3. Hoist assembly; 4. Reinforcement rib; 5. Connector; 6. First steel wire rope; 7. Fixing plate; 8. Vertical plate; 9. Semi-circular plate; 10. Screw; 11. First rope guide; 12. Fixing member; 13. Second rope guide; 14. Counterweight; 15. Slide plate; 16. First guide pulley; 17. Arc sleeve; 18. Mounting hole; 19. Lifting lug; 20. Mounting plate; 21. Support rod; 22. Vibrating hammer; 23. Lug plate; 24. First scale plate; 25. Rotating sleeve; 26. Connecting rod; 27. Counterweight ball ; 28. Connecting shaft; 29. ​​Limiting plate; 30. Positioning column; 31. Second scale plate; 32. Positioning hole; 33. Second guide pulley; 34. Threading tube; 35. Connecting sleeve; 36. Limiting plate; 37. Slide rod; 38. Support plate; 39. Screw; 40. Roller; 41. Upper pulley; 42. Lower pulley; 43. Belt; 44. Driving motor; 45. Load-bearing beam; 46. Slide trolley; 47. Steel pipe column; 48. Installation platform; 49. Standard boat section; 50. Semi-connecting pipe; 51. Second wire rope; 52. Hoop; 53. Rotating shaft. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0035] In the present invention, unless otherwise specified, directions such as "up" and "down" are generally used with respect to the directions shown in the drawings, or with respect to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" are generally used with respect to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0036] For example 1, please refer to Figure 1-12 , the present invention provides the following technical solutions:

[0037] Specifically, it includes a steel pipe pile 1 inserted obliquely into the bottom of the silt layer, a floating gantry boat 2 and a winch assembly 3 hung on the floating gantry boat 2; a circle of reinforcing ribs 4 are welded at the pipe mouth of the steel pipe pile 1; it also includes: a connector 5 for fixing the steel pipe pile 1; and a first steel wire rope 6 for connecting the winch assembly 3 and the connector 5; the winch assembly 3 includes: a fixed plate 7, a vertical plate 8 is symmetrically arranged on the surface of the fixed plate 7; a semi-annular plate 9 is arranged on the bottom surface of the fixed plate 7; a screw rod 10 is rotated between the two vertical plates 8; a first guide screw is threadedly arranged on the screw rod 10 Rope member 11; a fixing member 12 fixedly mounted on the semi-annular plate 9 by fastening bolts; and a second guide rope member 13 rotatably arranged on the fixing member 12; and a counterweight member 14 rotatably arranged on the fixing member 12 and the connecting member 5; the first steel wire rope 6 is wound around the hoisting assembly 3, and one end thereof passes through the first guide rope member 11 and the second guide rope member 13 in sequence and is connected to the connecting member 5; the second guide rope member 13 is rotated according to the angle of the counterweight member 14 on the first dial 24 to ensure that the force direction of the first steel wire rope 6 coincides with the axial direction of the steel pipe pile 1.

[0038] The specific implementation method of this embodiment 1 is as follows: by moving the floating gantry boat 2 to the specified position, the steel pipe pile 1 is loosened by the vibrating hammer 22 on the connecting member 55, so that the soil at the root of the steel pipe pile 1 is liquefied and the friction is reduced. After the vibrating hammer 22 is pulled out for 1m, the hammer is stopped, and a circle of reinforcing ribs 4 is welded at the pipe mouth to improve the strength at the pipe mouth; the connecting member 5 is fixed on the steel pipe pile 1, and the counterweight 14 on the second dial 31 is adjusted by the first dial 24 to ensure that the force direction of the first steel wire rope 6 coincides with the axial direction of the steel pipe pile 1, so as to facilitate the pulling out of the steel pipe pile 1 which is tilted in the silt layer, replacing the traditional method of adjusting the angle of the hydraulic lifter and the lifting bracket by rotating the hydraulic cylinder. The operation is simple and the investment cost is reduced.

[0039] For example 2, please refer to Figure 3-12, this embodiment 2 makes the following improvements on the basis of embodiment 1. Specifically, the first guide rope member 11 includes a slide plate 15 that is threadedly arranged on the screw rod 10; the slide plate 15 is slidably matched with the side of the fixed plate 7; the side of the slide plate 15 is symmetrically rotated with a first guide pulley 16; the fixed member 12 includes an arc-shaped sleeve 17 that is slidably arranged on the semi-annular plate 9, and the side of the arc-shaped sleeve 17 and the semi-annular plate 9 are provided with mounting holes 18; the arc-shaped sleeve 17 is fixedly connected to the semi-annular plate 9 by fastening bolts; the connecting member 5 includes two mounting plates 20; the two mounting plates 20 A support rod 21 is symmetrically arranged between the two mounting plates 20; a vibrating hammer 22 is arranged between the two mounting plates 20; an ear plate 23 is arranged on the side of the vibrating hammer 22; a first scale plate 24 is fixedly connected to the side of the ear plate 23; a semi-connecting tube 50 is arranged on the surface of one mounting plate 20, and a lifting ear 19 for hanging the first wire rope 6 is arranged on its surface inside the semi-connecting tube 50; a second wire rope 51 is symmetrically hung below one mounting plate 20; the ends of the two second wire ropes 51 are connected to a clamp 52; the counterweight 14 includes a rotating sleeve 25; a connecting rod 2 is arranged on the side of the rotating sleeve 25 6; a counterweight ball 27 is provided at the end of the connecting rod 26; a rotating shaft 53 is provided on the side of the arc-shaped sleeve 17; the rotating sleeves 25 on the two counterweight members 14 are respectively rotatably matched with the side of the first scale plate 24 and the rotating shaft 53; a connecting shaft 28 is provided on the side of the arc-shaped sleeve 17; a limit plate 29 is slidably provided on the connecting shaft 28; a positioning column 30 is provided on the side of the limit plate 29 in a circumferential array; the second guide rope member 13 includes a second scale plate 31; the side of the second scale plate 31 is provided with a positioning hole 32 that is plugged into the positioning column 30; the side of the second scale plate 31 faces A second guide pulley 33 is provided for rotation, and a threading tube 34 is provided on its side just below the two second guide pulleys 33; a connecting sleeve 35 is provided on the other opposite side of the second scale plate 31 for rotationally cooperating with the connecting shaft 28; a limit plate 36 is provided on the side of the arc sleeve 17; slide rods 37 are symmetrically provided on the side of the limit plate 36; the limit plate 29 is slidably set on the two slide rods 37; a support plate 38 is provided on the side of the arc sleeve 17; a screw 39 is rotatably provided on the side of the support plate 38; one end of the screw 39 is rotatably set on the side of the limit plate 29.

[0040] The specific implementation of the second embodiment is as follows: the floating gantry ship 2 is moved to the designated position, a circle of reinforcing ribs 4 are welded at the mouth of the steel pipe pile 1, the clamp 52 is fixed to the side of the steel pipe pile 1 below the reinforcing ribs 4 by tightening bolts, the steel pipe pile 1 is vibrated loose by the vibrating hammer 22, so that the soil at the root of the steel pipe pile 1 is liquefied, the friction is reduced, and the strength at the mouth of the pipe is improved. The assembly process is simple and the work efficiency is improved. After the vibrating hammer 22 loosens the steel pipe pile 1, the work of the vibrating hammer 22 is stopped. Under the action of gravity, the counterweight ball 27 on the first dial 24 is always Vertically downward, read the angle a on the first scale plate 24, and the angle b between it and the axis of the steel pipe pile 1 is (90°-a). Under the action of gravity, the counterweight ball 27 on the second scale plate 31 always points vertically downward, and the second guide rope member 13 is rotated along the rotating shaft 53, so that the threading tube 34 and the semi-connecting tube 50 are arranged coaxially, so that the angle between the first steel wire rope 6 passing through the threading tube 34 and the second scale plate 31 is b, ensuring that the force direction of the first steel wire rope 6 coincides with the axis direction of the steel pipe pile 1, which facilitates the extraction of the steel pipe pile 1 inclined in the silt layer.

[0041] For example three, please refer to Figure 1-3 , this embodiment three makes the following improvements on the basis of embodiment one. Specifically, a roller 40 is rotatably provided between the two vertical plates 8 and above the screw rod 10; an upper pulley 41 and a lower pulley 42 are provided at the ends of the roller 40 and the screw rod 10 in sequence; a belt 43 is provided for transmission between the upper pulley 41 and the lower pulley 42; a driving motor 44 is installed on the side of the vertical plate 8; the output end of the driving motor 44 is fixedly connected to the roller 40; the floating gantry ship 2 includes a load-bearing beam 45; a slide trolley 46 is slidably provided on the load-bearing beam 45; the two vertical plates 8 are fixedly installed at the bottom of the slide trolley 46; steel pipe columns 47 are symmetrically provided on the bottom surface of the load-bearing beam 45; a mounting platform 48 is provided on the bottom surface of the steel pipe column 47; and a standard boat section 49 is provided at the bottom of the mounting platform 48.

[0042] The specific implementation method of this embodiment three is: move the floating gantry vessel 2 to the designated position. Compared with the larger floating crane on the water, the floating gantry vessel 2 can save energy consumption, reduce costs and increase efficiency. The assembled structure of the floating gantry vessel 2 is flexible and changeable, and the assembly is simple and fast. The structure has high stability and strong safety, which solves the problem that the large floating crane on the water cannot enter the bottom of the bridge for construction under low clearance; by starting the slide trolley 46, the winch assembly 3 is driven to slide on the load-bearing beam 45.

[0043] Obviously, the embodiments described above 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 making creative efforts should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0045] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0046] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A floating gantry boat for removing a steel pipe pile support at the bottom of a low-headroom beam, comprising a steel pipe pile (1) obliquely inserted into the bottom of a silt layer, a floating gantry boat (2), and a winch assembly (3) hung on the floating gantry boat (2); a circle of reinforcing ribs (4) is welded at the pipe mouth of the steel pipe pile (1); and the characteristics are: Also includes: A connecting piece (5) for fixing the steel pipe pile (1); and A first steel wire rope (6) for connecting the hoist assembly (3) and the connecting member (5); The hoist assembly (3) comprises: A fixed plate (7), wherein vertical plates (8) are symmetrically arranged on the surface of the fixed plate (7); a semi-annular plate (9) is arranged on the bottom surface of the fixed plate (7); A screw rod (10) is rotatably arranged between the two vertical plates (8); A first rope guide member (11) threadably disposed on the screw rod (10); A fixing member (12) fixedly mounted on the semi-annular plate (9) by tightening bolts; and Rotating a second rope guide member (13) disposed on the fixing member (12); and Rotating the counterweights (14) respectively arranged on the fixing member (12) and the connecting member (5); The first steel wire rope (6) is wound on the hoist assembly (3), and one end thereof passes through the first guide rope member (11) and the second guide rope member (13) in sequence and is connected to the connecting member (5); The connecting member (5) includes two mounting plates (20); a vibrating hammer (22) is provided between the two mounting plates (20); a lug plate (23) is provided on the side of the vibrating hammer (22); a first scale plate (24) is fixedly connected to the side of the lug plate (23); the second rope guide member (13) includes a second scale plate (31); The second rope guide member (13) is rotated according to the angle of the counterweight member (14) on the first scale plate (24) to ensure that the force direction of the first steel wire rope (6) coincides with the axial direction of the steel pipe pile (1).

2. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 1, characterized in that: The first rope guide member (11) comprises a slide plate (15) threadably arranged on the screw rod (10); the slide plate (15) is slidably engaged with the side of the fixed plate (7); and a first guide pulley (16) is symmetrically arranged on the side of the slide plate (15).

3. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 1, characterized in that: The fixing member (12) includes an arc-shaped sleeve (17) slidably arranged on the semi-annular plate (9), and mounting holes (18) are provided on the side of the arc-shaped sleeve (17) and the semi-annular plate (9); the arc-shaped sleeve (17) and the semi-annular plate (9) are fixedly connected by fastening bolts.

4. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 3, characterized in that: A support rod (21) is symmetrically arranged between the two mounting plates (20); a semi-connecting tube (50) is arranged on the surface of one mounting plate (20), and a lifting lug (19) for hanging a first steel wire rope (6) is arranged on the surface of the semi-connecting tube (50); a second steel wire rope (51) is symmetrically hung below one mounting plate (20); and the ends of the two second steel wire ropes (51) are both connected to a clamp (52).

5. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 4, characterized in that: The counterweight (14) includes a rotating sleeve (25); a connecting rod (26) is provided on the peripheral side of the rotating sleeve (25); a counterweight ball (27) is provided at the end of the connecting rod (26); a rotating shaft (53) is provided on the side of the arc-shaped sleeve (17); the rotating sleeves (25) on the two counterweights (14) are respectively rotatably matched with the side of the first scale plate (24) and the rotating shaft (53).

6. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 3, characterized in that: A connecting shaft (28) is provided on the side of the arc-shaped sleeve (17); a limit plate (29) is slidably provided on the connecting shaft (28); positioning posts (30) are provided on the side of the limit plate (29) in a circumferential array; positioning holes (32) are provided on the side of the second scale plate (31) for plugging and matching with the positioning posts (30); a second guide pulley (33) is symmetrically provided on the side of the second scale plate (31), and a threading tube (34) is provided on the side of the second scale plate (31) just below the two second guide pulleys (33); a connecting sleeve (35) is provided on the other opposite side of the second scale plate (31) for rotating with the connecting shaft (28).

7. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 6, characterized in that: A limit plate (36) is provided on the side of the arc sleeve (17); a slide bar (37) is symmetrically provided on the side of the limit plate (36); the limit plate (29) is slidably provided on the two slide bars (37); a support plate (38) is provided on the side of the arc sleeve (17); a screw rod (39) is rotatably provided on the side of the support plate (38); one end of the screw rod (39) is rotatably provided on the side of the limit plate (29).

8. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 1, characterized in that: A roller (40) is rotatably provided between the two vertical plates (8) and above the screw rod (10); an upper pulley (41) and a lower pulley (42) are provided at the ends of the roller (40) and the screw rod (10) in sequence; a belt (43) is provided between the upper pulley (41) and the lower pulley (42); a driving motor (44) is installed on the side of the vertical plate (8); and an output end of the driving motor (44) is fixedly connected to the roller (40).

9. The floating gantry vessel for removing steel pipe pile supports at the bottom of a low-headroom beam according to claim 1, characterized in that: The floating gantry ship (2) includes a load-bearing beam (45); a slide trolley (46) is slidably provided on the load-bearing beam (45); the two vertical plates (8) are fixedly installed on the bottom of the slide trolley (46); steel pipe columns (47) are symmetrically provided on the bottom surface of the load-bearing beam (45); a mounting platform (48) is provided on the bottom surface of the steel pipe columns (47); and standard boat sections (49) are provided at the bottom of each mounting platform (48).

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