A steel pile for a grab dredger and a method of using the same

Abstract

The application discloses a steel pile for a grab dredger and a use method thereof, and belongs to the technical field of dredgers. The steel pile for the grab dredger comprises a pile body pipe, and further comprises: a connecting pipe, which is fixedly connected with one end of the pile body pipe, and one end of the pile body pipe away from the connecting pipe is provided with a plug-in groove for the movable connection of the connecting pipe; and a positioning mechanism, which is fixedly arranged at the one end of the pile body pipe away from the connecting pipe; wherein the positioning mechanism comprises a first positioning assembly and a second positioning assembly for locking the connecting pipe; the connecting pipe of one pile body pipe is plugged into the plug-in groove of another pile body pipe, the connecting distance of the two pile body pipes is increased, the connecting strength and the supporting strength of the connecting part are effectively enhanced, the screwing action of a plurality of bolts between the pile body pipes is reduced, and the connecting efficiency between the two pile body pipes is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of dredging technology, and in particular to a steel pile for a grab bucket dredging vessel and its application method. Background Technology

[0002] In existing technologies, dredgers are used for underwater earthwork construction, specifically: deepening, widening, and clearing existing waterways and ports; excavating new waterways, ports, and canals; dredging the foundation trenches for wharves, docks, locks, and other hydraulic structures; and dumping dredged silt into the deep sea or using it to reclaim land from depressions. They are powerful tools for land reclamation. During the construction process of grab dredgers, after the vessel reaches the construction area, it needs to be anchored using positioning steel piles. During the cutter suction dredging operation in this area, the vessel operates with the positioning steel piles as the center, and the dredging area is fan-shaped.

[0003] In recent years, due to the expansion of the dredging market, the required dredging depth has gradually increased, reaching over 30 meters or even deeper. Traditional grab dredgers use steel piles, which are mostly simple pipe structures with limited functionality due to structural limitations. When splicing is required, multiple bolts need to be manually installed around the joint, a cumbersome process that affects the efficiency of disassembly and assembly. Furthermore, the joints often lack strength, impacting the overall performance of the steel piles. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to propose a steel pile for a grab bucket dredger and its usage method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A steel pile for a grab dredger includes a pile body fitting and further includes: A connecting pipe, wherein one end of the connecting pipe is fixedly connected to the pile body fitting, and the end of the pile body fitting away from the connecting pipe is provided with a insertion groove for the connecting pipe to move; and A positioning mechanism is fixed at the end of the pile body fitting away from the connecting pipe; The positioning mechanism includes a first positioning component and a second positioning component for locking the connecting tube.

[0006] Preferably, the pile body fitting includes an outer pile body pipe and an inner pile body pipe fixed inside the outer pile body pipe. The outer pile body pipe and the inner pile body pipe are coaxially arranged, and the connecting pipe and the insertion groove are respectively arranged at both ends of the inner pile body pipe.

[0007] Preferably, a reinforcing rib is fixed between the outer tube of the pile and the inner tube of the pile. Multiple reinforcing ribs are provided and are evenly distributed in a circular pattern between the outer tube of the pile and the inner tube of the pile, with adjacent reinforcing ribs intersecting at an incline.

[0008] Preferably, the first positioning component includes a rotating seat rotatably connected to the outer tube of the pile body, a bevel gear ring fixedly connected to the rotating seat, a driven bevel gear rotatably connected to the outer tube of the pile body via a bearing and meshing with the bevel gear ring, and a first positioning rod slidably disposed with the driven bevel gear and threadedly connected to the outer tube of the pile body. The connecting tube is provided with a first positioning hole that cooperates with the first positioning rod.

[0009] Preferably, the second positioning component includes a connecting plate fixedly connected to the rotating seat, a gear ring connected to the end of the connecting plate away from the rotating seat, a driven gear rotatably connected to the inner tube of the pile body via a bearing, and a second positioning rod slidably disposed with the driven gear and threadedly connected to the inner tube of the pile body. The connecting tube is provided with a second positioning hole that cooperates with the second positioning rod.

[0010] Preferably, both the driven bevel gear and the inner wall of the driven gear are fixed with guide strips, and the first positioning rod and the second positioning rod are respectively provided with guide grooves along their axial direction that cooperate with the guide strips.

[0011] Preferably, both the first positioning hole and the second positioning hole are threaded holes, the first positioning rod is threaded to the first positioning hole, and the second positioning rod is threaded to the second positioning hole.

[0012] Preferably, the outer side of the outer tube of the pile body is provided with a movable groove for the movement of the rotating seat, an elastic telescopic rod is fixed in the movable groove, an annular plate is fixed at the end of the elastic telescopic rod away from the movable groove, an insertion rod is provided at the bottom of the annular plate, and an insertion hole is provided on the rotating seat to cooperate with the insertion rod.

[0013] Preferably, a fixing rod is fixedly provided at one end of the outer tube of the pile body, and a slot for the fixing rod to be movably inserted is provided at the end of the outer tube of the pile body away from the fixing rod.

[0014] This invention also discloses a method for using steel piles on a grab dredger, which includes the following steps: S1: When increasing the dredging depth of the dredger, the length of the steel pile needs to be increased. When installing the pile body pipes of the steel pile, the connecting pipe of the two pile body pipes to be installed should be connected with the insertion slot, and the fixing rod of the outer pipe of the two pile bodies should be aligned with the slot. After the connecting pipe is connected with the insertion slot, the first positioning rod is aligned with the first positioning hole, and the second positioning rod is aligned with the second positioning hole. S2: Then, by raising the annular plate, the insert rod on the annular plate is moved away from the insertion hole of the rotating seat, and the rotating seat is no longer restricted in rotation. The worker rotates the rotating seat, which drives the bevel gear ring to rotate. During the rotation of the bevel gear ring, it meshes with the driven bevel gear inside the outer tube of the pile body. The driven bevel gear drives the first positioning rod to rotate through the guide bar. Since the first positioning rod is threadedly connected to the outer tube of the pile body, the first positioning rod is screwed into the first positioning hole during rotation, realizing a single locking between the outer tube of the pile body and the connecting pipe. S3: During the rotation of the rotating seat, the gear ring is driven to rotate through the connecting plate. When the gear ring rotates, it meshes with the driven gear. The driven gear drives the second positioning rod to rotate through the guide bar. Since the second positioning rod is threaded with the inner tube of the pile body, the second positioning rod is screwed into the second positioning hole during the rotation until the slot on the rotating seat is aligned with the fixed rod again, realizing the double locking of the inner tube of the pile body and the connecting tube, thereby realizing the quick installation of two adjacent pile body fittings. S4: Then the ring plate is no longer raised. The ring plate is reset under the elastic force of the elastic telescopic rod, so that the insert rod on the ring plate is inserted into the insertion hole of the rotating seat, thereby limiting the rotating seat and further locking the installation status of the pile body fittings.

[0015] Compared with the prior art, the present invention provides a steel pile for a grab dredger and its application method, which has the following beneficial effects: 1. The steel piles used in this grab dredger and their usage method increase the connection distance between the two pile pipes by inserting the connecting pipe of one pile pipe into the insertion groove of another pile pipe, thereby effectively enhancing the connection strength and support strength of the connection part. In addition, the setting of the positioning mechanism reduces the turning action of multiple bolts between the pile pipes, reduces the workload of the workers, and effectively improves the connection efficiency between the two pile pipes.

[0016] 2. The steel piles used in this grab dredger and their usage method involve rotating the rotating seat, which drives the bevel gear ring to rotate. During the rotation of the bevel gear ring, it meshes with the driven bevel gear inside the outer tube of the pile body. The driven bevel gear drives the first positioning rod to rotate through the guide bar. Since the first positioning rod is threadedly connected to the outer tube of the pile body, the first positioning rod is screwed into the first positioning hole during rotation, realizing a single locking between the outer tube of the pile body and the connecting pipe. This eliminates the need for manual tightening of the bolts between the pile body components, reducing the workload of the installation staff and effectively improving the connection efficiency between the two pile body components.

[0017] 3. The steel piles used in this grab dredger and their usage method involve rotating the rotating seat, which drives the gear ring to rotate via the connecting plate. When the gear ring rotates, it meshes with the driven gear, which in turn drives the second positioning rod to rotate via the guide bar. Since the second positioning rod is threaded into the inner tube of the pile, it screws into the second positioning hole during rotation until the slot on the rotating seat is aligned with the fixed rod again, achieving a double locking between the inner tube of the pile and the connecting tube. This enables the rapid installation of two adjacent pile components and effectively enhances the connection strength and support strength of the connection parts. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the pile body fitting of the present invention; Figure 2 This is a cross-sectional structural diagram of the pile body fitting of the present invention; Figure 3 This is a schematic cross-sectional view of the two pile body pipe fittings of the present invention when they are inserted together. Figure 4 For the present invention Figure 3 A partially enlarged structural diagram of section A in the middle; Figure 5 For the present invention Figure 3 A partially enlarged structural diagram of section B in the middle; Figure 6 This is a top view cross-sectional structural diagram of the pile body fitting of the present invention; Figure 7 This is a schematic diagram of the structure of the second positioning rod of the present invention.

[0019] In the diagram: 1. Pile body fittings; 101. Outer pipe of the pile body; 102. Inner pipe of the pile body; 2. Connecting pipe; 201. First positioning hole; 202. Second positioning hole; 3. Insertion groove; 4. Positioning mechanism; 5. Reinforcing rib; 6. Rotating seat; 601. Bevel gear ring; 602. Driven bevel gear; 603. First positioning rod; 7. Connecting plate; 701. Gear ring; 702. Driven gear; 703. Second positioning rod; 8. Movable groove; 801. Elastic telescopic rod; 802. Annular plate; 803. Insert rod; 804. Insertion hole; 9. Fixing rod; 901. Slot; 10. Guide bar; 1001. Guide groove. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example: Refer to Figure 1 , Figure 2 and Figure 3 A steel pile for a grab dredger, comprising a pile body fitting 1, and further comprising: Connecting pipe 2, one end of which is fixedly connected to pile body fitting 1, and the end of pile body fitting 1 away from connecting pipe 2 is provided with a insertion groove 3 for the movement of connecting pipe 2; and Positioning mechanism 4 is fixed at the end of the pile body fitting 1 away from the connecting pipe 2; The positioning mechanism 4 includes a first positioning component and a second positioning component for locking the connecting tube 2.

[0024] Specifically, when increasing the dredging depth of the dredger, the length of the steel piles needs to be increased. When installing the pile body pipes 1, the connecting pipes 2 of the two pile body pipes 1 to be installed are connected to the insertion slots 3. By inserting the connecting pipe 2 of one pile body pipe 1 into the insertion slot 3 of the other pile body pipe 1, the connection distance between the two pile body pipes 1 is increased, thereby effectively enhancing the connection strength and support strength of the connection part. In addition, the setting of the positioning mechanism 4 reduces the turning action of multiple bolts between the pile body pipes 1, reduces the workload of the workers, and effectively improves the connection efficiency between the two pile body pipes 1.

[0025] Reference Figure 1 , Figure 2 , Figure 3 and Figure 6As a preferred technical solution of the present invention, the pile body fitting 1 further includes an outer pile body pipe 101 and an inner pile body pipe 102 fixed inside the outer pile body pipe 101. The outer pile body pipe 101 and the inner pile body pipe 102 are coaxially arranged, and the connecting pipe 2 and the insertion groove 3 are respectively arranged at both ends of the inner pile body pipe 102.

[0026] Furthermore, a reinforcing rib 5 is fixed between the outer tube 101 and the inner tube 102 of the pile. Multiple reinforcing ribs 5 are provided and are evenly distributed in a circular pattern between the outer tube 101 and the inner tube 102 of the pile, with adjacent reinforcing ribs 5 intersecting at an incline.

[0027] Specifically, by setting the steel pile as a hollow double-layer tube and setting several inclined intersecting reinforcing ribs 5 between the double-layer tubes, the amplitude of the lateral load borne by the pile tube 1 is increased. This design greatly improves the strength of the steel pile. In addition, the connecting pipe 2 extends from one pile tube 1 and is inserted into the insertion groove 3 of another pile tube 1, increasing the connection distance between the two pile tubes 1, thereby effectively enhancing the connection strength and support strength of the connection part.

[0028] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As a preferred technical solution of the present invention, the first positioning component further includes a rotating seat 6 rotatably connected to the outer tube 101 of the pile body, a bevel gear ring 601 fixedly connected to the rotating seat 6, a driven bevel gear 602 rotatably connected to the outer tube 101 of the pile body via a bearing and meshing with the bevel gear ring 601, and a first positioning rod 603 slidably disposed with the driven bevel gear 602 and threadedly connected to the outer tube 101 of the pile body. A first positioning hole 201 is provided on the connecting pipe 2 to cooperate with the first positioning rod 603. Specifically, when the first positioning component is working, the operator rotates the rotating seat 6... The rotating seat 6 drives the bevel gear ring 601 to rotate. During the rotation of the bevel gear ring 601, it meshes with the driven bevel gear 602 inside the outer tube 101 of the pile body. The driven bevel gear 602 drives the first positioning rod 603 to rotate. Since the first positioning rod 603 is threadedly connected to the outer tube 101 of the pile body, the first positioning rod 603 is screwed into the first positioning hole 201 during the rotation, realizing a first locking between the outer tube 101 of the pile body and the connecting pipe 2. There is no need to manually tighten the bolts between the pile body fittings 1 one by one, which reduces the workload of the staff and effectively improves the connection efficiency between the two pile body fittings 1.

[0029] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As a preferred technical solution of the present invention, the second positioning component further includes a connecting plate 7 fixedly connected to the rotating seat 6, a gear ring 701 connected to the end of the connecting plate 7 away from the rotating seat 6, a driven gear 702 rotatably connected to the inner tube 102 of the pile body via a bearing, and a second positioning rod 703 slidably disposed with the driven gear 702 and threadedly connected to the inner tube 102 of the pile body. A second positioning hole 202 is provided on the connecting tube 2 to cooperate with the second positioning rod 703. Specifically, during the rotation of the rotating seat 6, the connecting plate 7 drives the gear ring 701 to rotate. When the gear ring 701 rotates, it meshes with the driven gear 702, and the driven gear 702 drives the guide bar 10 to rotate. As the second positioning rod 703 rotates, and due to the threaded connection between the second positioning rod 703 and the inner tube 102 of the pile body, the second positioning rod 703 is screwed into the second positioning hole 202 during rotation until the slot 901 on the rotating seat 6 is aligned with the fixed rod 9 again, thus achieving a double lock between the inner tube 102 of the pile body and the connecting pipe 2. This enables the rapid installation of two adjacent pile body fittings 1 without the need for manual tightening of the bolts between the pile body fittings 1, reducing the workload of the installation staff and effectively improving the connection efficiency between the two pile body fittings 1. Furthermore, the double limiting and locking of the connecting pipe 2 by the outer tube 101 and the inner tube 102 of the pile body effectively enhances the connection strength and support strength of the connection part.

[0030] Reference Figure 4 , Figure 5 and Figure 7 As a preferred technical solution of the present invention, furthermore, both the driven bevel gear 602 and the driven gear 702 are fixedly provided with guide bars 10, and the first positioning rod 603 and the second positioning rod 703 are respectively provided with guide grooves 1001 along their axial direction to cooperate with the guide bars 10; specifically, when the driven bevel gear 602 rotates, it can drive the first positioning rod 603 to rotate through the guide bars 10 connected to it, and when the driven gear 702 rotates, it can drive the second positioning rod 703 to rotate through the guide bars 10 connected to it.

[0031] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 As a preferred technical solution of the present invention, furthermore, both the first positioning hole 201 and the second positioning hole 202 are set as threaded holes, the first positioning rod 603 is threadedly connected to the first positioning hole 201, and the second positioning rod 703 is threadedly connected to the second positioning hole 202; specifically, by setting the positioning rod and the positioning hole as threaded, the stability of the first positioning component for the outer tube 101 of the pile body and the connecting pipe 2 is improved, and the connection stability of the second positioning component for the inner tube 102 of the pile body and the connecting pipe 2 is improved, thus avoiding loosening at the connection.

[0032] Reference Figure 3 and Figure 4As a preferred technical solution of the present invention, furthermore, an active groove 8 for the movement of the rotating seat 6 is provided on the outer side of the outer tube 101 of the pile body. An elastic telescopic rod 801 is fixed in the active groove 8. An annular plate 802 is fixed at the end of the elastic telescopic rod 801 away from the active groove 8. An insertion rod 803 is provided at the bottom of the annular plate 802. An insertion hole 804 that cooperates with the insertion rod 803 is provided on the rotating seat 6. Specifically, by lifting the annular plate 802, the insertion rod 803 on the annular plate 802 is moved away from the insertion hole 804 of the rotating seat 6, and the rotating seat 6 is no longer restricted to rotation. After the positioning mechanism 4 positions the two pile body tubes 1, the annular plate 802 is no longer lifted. The annular plate 802 is reset under the elastic force of the elastic telescopic rod 801, so that the insertion rod 803 on the annular plate 802 is inserted into the insertion hole 804 of the rotating seat 6, thereby limiting the rotation of the rotating seat 6 and further locking the installation state of the pile body tubes 1, ensuring the connection stability between the pile body tubes 1.

[0033] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As a preferred technical solution of the present invention, a fixing rod 9 is fixedly provided at one end of the outer tube 101 of the pile body, and a slot 901 for the fixing rod 9 to be movably inserted is provided at the end of the outer tube 101 of the pile body away from the fixing rod 9. Specifically, when the pile body tubes 1 of the steel pile are installed, the connecting pipe 2 of the two pile body tubes 1 to be installed is connected with the insertion slot 3, and the fixing rod 9 of the two outer tubes 101 of the pile body is aligned with the slot 901. After the connecting pipe 2 is connected with the insertion slot 3, the first positioning rod 603 is aligned with the first positioning hole 201, and the second positioning rod 703 is aligned with the second positioning hole 202, which facilitates the positioning mechanism 4 to connect and install the two pile body tubes 1.

[0034] This invention also discloses a method for using steel piles on a grab dredger, which includes the following steps: S1: When increasing the dredging depth of the dredger, the length of the steel pile needs to be increased. When installing the pile body pipe 1 of the steel pile, the connecting pipe 2 of the two pile body pipe 1 to be installed is connected with the insertion groove 3, and the fixing rod 9 of the two pile body outer pipe 101 is aligned with the slot 901. After the connecting pipe 2 is connected with the insertion groove 3, the first positioning rod 603 is aligned with the first positioning hole 201, and the second positioning rod 703 is aligned with the second positioning hole 202. S2: Then, by raising the annular plate 802, the insertion rod 803 on the annular plate 802 is moved away from the insertion hole 804 of the rotating seat 6, and the rotating seat 6 is no longer restricted in rotation. The worker rotates the rotating seat 6, which drives the bevel ring 601 to rotate. During the rotation of the bevel ring 601, it meshes with the driven bevel gear 602 in the outer tube 101 of the pile body. The driven bevel gear 602 drives the first positioning rod 603 to rotate through the guide bar 10. Since the first positioning rod 603 is threadedly connected to the outer tube 101 of the pile body, the first positioning rod 603 is screwed into the first positioning hole 201 during the rotation, realizing a first locking between the outer tube 101 of the pile body and the connecting pipe 2. S3: During the rotation of the rotating seat 6, the gear ring 701 is driven to rotate through the connecting plate 7. When the gear ring 701 rotates, it meshes with the driven gear 702. The driven gear 702 drives the second positioning rod 703 to rotate through the guide bar 10. Since the second positioning rod 703 is threaded with the inner tube 102 of the pile body, the second positioning rod 703 is screwed into the second positioning hole 202 during the rotation until the slot 901 on the rotating seat 6 is aligned with the fixed rod 9 again, realizing the double locking of the inner tube 102 of the pile body and the connecting pipe 2, thereby realizing the quick installation of two adjacent pile body fittings 1. S4: Then the ring plate 802 is no longer lifted. The ring plate 802 is reset under the elastic force of the elastic telescopic rod 801, so that the insertion rod 803 on the ring plate 802 is inserted into the insertion hole 804 of the rotating seat 6, thereby limiting the rotating seat 6 and further locking the installation state of the pile body pipe 1.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A steel pile for a grab bucket dredger, comprising a pile body fitting (1), characterized in that, Also includes: A connecting pipe (2) is fixedly connected to one end of a pile body fitting (1), and the end of the pile body fitting (1) away from the connecting pipe (2) is provided with a insertion groove (3) for the movement of the connecting pipe (2); and Positioning mechanism (4), the positioning mechanism (4) is fixed at one end of the pile body fitting (1) away from the connecting pipe (2); The positioning mechanism (4) includes a first positioning component and a second positioning component for locking the connecting tube (2); The pile body fitting (1) includes an outer pile body pipe (101) and an inner pile body pipe (102) fixed inside the outer pile body pipe (101). The first positioning component includes a rotating seat (6) rotatably connected to the outer tube (101) of the pile body, a bevel ring (601) fixedly connected to the rotating seat (6), a driven bevel gear (602) rotatably connected to the outer tube (101) of the pile body via a bearing and meshing with the bevel ring (601), and a first positioning rod (603) slidably disposed with the driven bevel gear (602) and threadedly connected to the outer tube (101) of the pile body. The connecting tube (2) is provided with a first positioning hole (201) that cooperates with the first positioning rod (603). The second positioning component includes a connecting plate (7) fixedly connected to the rotating seat (6), a gear ring (701) connected to the end of the connecting plate (7) away from the rotating seat (6), a driven gear (702) rotatably connected to the inner tube (102) of the pile body via a bearing, and a second positioning rod (703) slidably disposed with the driven gear (702) and threadedly connected to the inner tube (102) of the pile body. The connecting tube (2) is provided with a second positioning hole (202) that cooperates with the second positioning rod (703).

2. The steel pile for a grab dredger according to claim 1, characterized in that, The outer tube (101) of the pile body and the inner tube (102) of the pile body are coaxially arranged, and the connecting pipe (2) and the insertion groove (3) are respectively arranged at both ends of the inner tube (102) of the pile body.

3. The steel pile for a grab dredger according to claim 2, characterized in that, A reinforcing rib (5) is fixed between the outer tube (101) and the inner tube (102) of the pile. Multiple reinforcing ribs (5) are provided and are evenly distributed in a circular pattern between the outer tube (101) and the inner tube (102) of the pile. Two adjacent reinforcing ribs (5) intersect at an incline.

4. A steel pile for a grab dredger according to claim 3, characterized in that, Guide bars (10) are fixedly provided on the inner walls of both the driven bevel gear (602) and the driven gear (702). The first positioning rod (603) and the second positioning rod (703) are respectively provided with guide grooves (1001) along their axial direction to cooperate with the guide bars (10).

5. A steel pile for a grab dredger according to claim 4, characterized in that, The first positioning hole (201) and the second positioning hole (202) are both threaded holes. The first positioning rod (603) is threaded to the first positioning hole (201), and the second positioning rod (703) is threaded to the second positioning hole (202).

6. A steel pile for a grab dredger according to claim 5, characterized in that, The outer side of the outer tube (101) of the pile body is provided with a movable groove (8) for the movement of the rotating seat (6). An elastic telescopic rod (801) is fixed in the movable groove (8). An annular plate (802) is fixed at one end of the elastic telescopic rod (801) away from the movable groove (8). An insertion rod (803) is provided at the bottom of the annular plate (802). An insertion hole (804) that cooperates with the insertion rod (803) is provided on the rotating seat (6).

7. A steel pile for a grab dredger according to claim 6, characterized in that, A fixing rod (9) is fixed at one end of the outer tube (101) of the pile body, and a slot (901) for the fixing rod (9) to be movably inserted is provided at the other end of the outer tube (101) of the pile body away from the fixing rod (9).

8. The method of using steel piles for a grab bucket dredger according to claim 7, characterized in that, It also includes the following steps: S1: When increasing the dredging depth of the dredger, the length of the steel pile needs to be increased. When installing the pile body pipes (1) of the steel pile, the connecting pipe (2) of the two pile body pipes (1) to be installed is connected to the insertion groove (3), and the fixing rod (9) of the two pile body pipes (101) is aligned with the slot (901). After the connecting pipe (2) is connected to the insertion groove (3), the first positioning rod (603) is aligned with the first positioning hole (201), and the second positioning rod (703) is aligned with the second positioning hole (202). S2: Then, by raising the ring plate (802), the insertion rod (803) on the ring plate (802) is moved away from the insertion hole (804) of the rotating seat (6), and the rotating seat (6) is no longer restricted from rotation. The worker rotates the rotating seat (6), which drives the bevel ring (601) to rotate. During the rotation of the bevel ring (601), it meshes with the driven bevel gear (602) in the outer tube of the pile body (101). The driven bevel gear (602) drives the first positioning rod (603) to rotate through the guide bar (10). Since the first positioning rod (603) is threadedly connected to the outer tube of the pile body (101), the first positioning rod (603) is screwed into the first positioning hole (201) during the rotation, realizing a first locking between the outer tube of the pile body (101) and the connecting pipe (2). S3: During the rotation of the rotating seat (6), the gear ring (701) is driven to rotate through the connecting plate (7). When the gear ring (701) rotates, it meshes with the driven gear (702) for transmission. The driven gear (702) drives the second positioning rod (703) to rotate through the guide bar (10). Since the second positioning rod (703) is threaded with the inner tube (102) of the pile body, the second positioning rod (703) is screwed into the second positioning hole (202) during the rotation until the slot (901) on the rotating seat (6) is aligned with the fixed rod (9) again, realizing the double locking of the inner tube (102) of the pile body and the connecting pipe (2), thereby realizing the rapid installation of two adjacent pile body fittings (1). S4: Then the ring plate (802) is no longer lifted. The ring plate (802) is reset under the elastic force of the elastic telescopic rod (801), so that the insertion rod (803) on the ring plate (802) is inserted into the insertion hole (804) of the rotating seat (6), thereby limiting the rotating seat (6) and further locking the installation state of the pile body pipe (1).

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