An underwater pile driving apparatus and method

Abstract

The application discloses an underwater piling device and a piling method, and the piling device comprises a driving mechanism, a main rod, a cylinder rod, a rotary digging cylinder, an inserting rod and an inserting head; the main rod and the cylinder rod are both hollow pipe structures; the driving mechanism supports and drives the main rod to rotate and extrude downward, the cylinder rod is sleeved in the main rod; the cylinder rod and the main rod are linked through a spline structure which can axially relatively move but rotationally interfere, a first spring is arranged between the cylinder rod and the main rod to limit the relative axial moving distance of the cylinder rod and the main rod; the main rod is fixedly connected with the upper end of the rotary digging cylinder; the inserting rod is fixed in the lower part of the rotary cylinder through a connecting rod; and the inserting head is fixed at the lower end of the inserting rod. The application can not only more efficiently and easily dig the underwater rock and soil, but also continuously transport the curved rock and soil outward, thereby obviously improving the efficiency of digging the pile hole, reducing the construction period, lowering the construction cost and guaranteeing the continuity of the pile hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geotechnical engineering, in particular to an underwater piling device and a piling method. BACKGROUND

[0002] With the large number of construction of cross-sea bridges, cross-sea cross-lake cross-river high-speed rails or highways in China, it is urgent to study the equipment and process technology suitable for underwater piling.

[0003] Underwater piling generally adopts the construction mode of cast-in-place piles. Before pouring, rotary drilling is needed. Due to long-term water pressure and sediment deposition of underwater geotechnical engineering, the soil has the characteristics of large viscosity and compactness, and the change is particularly obvious especially when continuously extending downward to the bottom of the water. In order to ensure the strength of the underwater pile body, it is generally necessary to extend to a relatively deep distance below the geotechnical engineering.

[0004] The present application is committed to the research and development of underwater piling technology, and the improvement of the efficiency and stability of underwater piling technology. SUMMARY

[0005] The present application provides an underwater piling device and a piling method. The underwater piling device can not only more efficiently and easily excavate underwater geotechnical engineering, but also continuously transport the curved geotechnical engineering outward, thereby significantly improving the efficiency of excavating pile holes, reducing construction period and construction cost, and ensuring the continuity of the pile hole.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] An underwater piling device, comprising a driving mechanism, a main rod, a barrel rod, a rotary digging barrel, a inserting rod and a plug; the main rod and the barrel rod are both hollow pipe structures; the driving mechanism supports and drives the main rod to rotate and extrude downward, the barrel rod is sleeved in the main rod; and the barrel rod and the main rod are linked through a spline structure that can axially move relative to each other but rotate interference, a first spring is arranged between the barrel rod and the main rod to limit the relative axial movement distance of the barrel rod and the main rod; the main rod is fixedly connected with the upper end of the rotary digging barrel; the inserting rod is fixed in the lower part of the rotary barrel through a connecting rod; the plug is fixed at the lower end of the inserting rod; a Jiaolong shaft is rotatably sleeved in the barrel rod; the lower end of the Jiaolong shaft extends into the rotary digging barrel, and the upper end extends to the side soil outlet on the main rod; the rotation direction of the Jiaolong shaft is opposite to that of the main rod.

[0008] Among them, a first stop ring is fixed on the outer circumference of the barrel rod below the main rod; the first spring is sleeved outside the barrel rod between the first stop ring and the lower end surface of the main rod.

[0009] Among them, a horn-shaped upper soil guide part with a small upper end and a large lower end is arranged in the rotary digging barrel; the upper end of the upper soil guide part is in communication with the lower end of the barrel rod, and the lower end is fixedly connected with the inner wall of the rotary digging barrel.

[0010] The upper guide soil piece is also trumpet-shaped with a small upper end and a large lower end.

[0011] The inner surfaces of the upper guide soil piece and the lower guide soil piece are convexly curved towards the shaft center.

[0012] The plug comprises a plug body and a tip body. The upper end of the plug body is fixedly connected with the lower end of the insertion rod. A liquid cavity is arranged in the plug body. A plurality of side liquid injection holes are uniformly arranged on the outer circumferential surface of the plug body. The side liquid injection holes are in communication with the liquid cavity from the side surface of the plug body. A lower liquid injection hole is arranged at the lower end of the plug body. The lower liquid injection hole is in communication with the liquid cavity from the lower end surface of the plug body. A counter electrode is arranged in the liquid cavity. An external circuit applies a strong electric field to the liquid in the liquid cavity through the counter electrode, thereby forming a liquid-electric effect.

[0013] The tip body is fixedly connected with a guide rod at the top. A convex column is arranged at the top center of the liquid cavity. A guide hole with an open lower end is vertically arranged at the center of the convex column. A second stop ring is arranged at the lower part of the guide hole. The upper part of the guide rod penetrates through the second stop ring and extends into the guide hole. A third stop ring is arranged at the upper end of the guide rod. The third stop ring interferes with the second stop ring. A second spring is connected between the upper end of the guide rod and the upper end of the guide hole. In a static state, the second spring makes the tip body pre-tighten at the lower end of the plug body. The outer diameter of the upper end of the tip body is the same as that of the lower end of the plug body.

[0014] The side liquid injection hole is inclined upward and gradually decreases in diameter from the inside to the outside. The diameter of the lower liquid injection hole gradually decreases from the inside to the outside.

[0015] The convex column opposite to the side liquid injection hole is a concave rotary structure facing the side liquid injection hole. The top of the liquid cavity opposite to the lower liquid injection hole is a concave rotary structure facing the lower liquid injection hole. The upper end surface of the tip body is a concave rotary structure facing the side surface. The rotary structure is used to reflect the liquid shock wave.

[0016] An underwater piling method using the underwater piling device, comprising the following steps:

[0017] ①The driving mechanism drives the main rod to rotate. The main rod drives the cylinder rod to rotate through the spline structure. The cylinder rod drives the rotary cylinder to rotate and excavates the underwater rock soil. In this process, the plug is first inserted into the underwater rock soil. External water flows into the liquid cavity through the side liquid injection hole and fills the liquid cavity.

[0018] The external circuit applies a high electric field to the water in the liquid cavity through the opposite electrodes, and the high pressure electric field passes through the water, and due to the instantaneous release of huge energy in the discharge channel, the water in the channel is rapidly vaporized, expanded and exploded to form a liquid electric effect;

[0019] The explosion impact force generated by the liquid electric effect makes the water in the liquid cavity jet out from the side and lower jet liquid cavities, and in this process, the impact water flow pushes the tip body and guide rod downward to overcome the pulling force of the second spring, so that the lower jet liquid hole is exposed, and the high-speed water flow sprayed outward loosens, damages or softens the rock-soil structure around the plug, and the loosened, damaged or softened rock-soil facilitates subsequent rotary drum excavation of rock-soil; at the same time, in this process, the plug body is subjected to an upward recoil force, which is sequentially transmitted to the plug rod, connecting rod, rotary drum and drum rod and compresses the first spring, so that the rotary drum generates an upward bouncing action, and generates a downward extrusion action when the first spring returns, thereby forming a bouncing action with each water flow jetting, which not only can carry out soil outward, but also can further loosen, damage or soften the rock-soil structure, and can reduce the huge friction force caused by the tight extrusion of the rock-soil structure on the rotary drum;

[0020] After each water flow jetting is completed, the second spring returns to pull the guide rod and the tip body upward to move upward, so that the tip body re-closes the lower end of the lower jet liquid hole and the plug forms an integral whole, facilitating re-insertion downward.

[0021] In the rotary drum excavation process, the rock-soil is guided by the lower and upper soil guiding members to gather at the Longhu shaft in the upper middle part of the rotary drum, and the Longhu shaft is synchronously and reversely rotated to transport the rock-soil upward from the middle of the drum rod and discharge it from the side soil discharge port on the main rod; and since the connecting rod is fixed on the lower soil guiding member, the recoil force generated by the water flow jetting also acts on the lower and upper soil guiding members instantaneously to shake off the rock-soil adhered to the surfaces of the lower and upper soil guiding members, avoiding blockage of the rock-soil gathering channel.

[0022] Compared with the prior art, the underwater pile driving device has the advantages that the structure is scientific and reasonable, and the use is safe and convenient.

[0023] 1、The underwater pile driving device can not only more efficiently and easily excavate underwater rock-soil, but also continuously transport the curved rock-soil outward, thereby significantly improving the efficiency of excavating the pile hole, reducing the construction period and construction cost, and ensuring the continuity of the pile hole.

[0024] 2、The explosive impact force generated by the liquid-electric effect makes the water in the liquid cavity shoot out from the side and lower spray liquid cavities. In this process, the impact water flow pushes the tip body and guide rod downward to overcome the tension of the second spring, so that the lower spray liquid hole is exposed, and the high-speed water flow sprayed outward loosens, destroys or softens the rock-soil structure around the plug, and the loosened, destroyed or softened rock-soil facilitates subsequent rotary drum excavation of rock-soil; at the same time, in this process, the plug body is subjected to an upward recoil force, which is sequentially transmitted to the plug rod, connecting rod, rotary drum and barrel rod, and compresses the first spring, so that the rotary drum produces an upward bouncing action, and generates a downward extrusion action when the first spring returns, thereby forming a bouncing action with each water flow injection, which not only can carry out soil outward, but also can further loosen, destroy or soften the rock-soil structure, and can reduce the huge friction force caused by the tight extrusion of the rotary drum by the rock-soil structure.

[0025] 3、In the rotary drum excavation process, the rock-soil is guided by the lower and upper soil guiding members and gathered at the Long axis in the upper middle part of the rotary drum, and the Long axis is synchronously and reversely rotated to transport the rock-soil upward from the middle of the barrel rod and discharge it from the side soil discharge port on the main rod; so that the pile driving device can continuously operate, the process of repeatedly lifting the pile driving device is reduced, and the pile hole has continuity and stability, and since the connecting rod is fixed on the lower soil guiding member, the recoil force generated by the water flow injection also acts on the lower and upper soil guiding members instantaneously, shakes the rock-soil adhered to the surface of the lower and upper soil guiding members, and avoids blocking the rock-soil gathering channel.

[0026] 4、The present application ingeniously uses the chain reaction generated by the liquid-electric effect to combine the main rod, barrel rod, rotary drum and plug together, which produces a plurality of effects that are significantly beneficial to underwater excavation of pile holes, thereby having significant advantages compared with the existing underwater pile driving device and pile driving process. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, but do not constitute a limitation of the present application.

[0028] In the drawings:

[0029] Fig. 1 is a schematic view of the underwater pile driving device of the present application;

[0030] Fig. 2 is a cross-sectional view of the intersection of the main rod and the barrel rod of the present application;

[0031] Fig. 3 is a cross-sectional view of the intersection of the rotary drum and the plug of the present application;

[0032] Fig. 4is the sectional view schematic diagram of the plug under normal condition of the application;

[0033] Fig. 5 is the sectional view schematic diagram of the plug at the time of liquid-electricity jet of the application.

[0034] Figure mark:

[0035] 1, drive mechanism; 2, main rod; 3, barrel rod; 31, first stop ring; 4, rotary digging barrel; 41, upper soil guide; 42, lower soil guide; 5, insertion rod; 51, connecting rod; 6, plug; 61, plug main body; 62, liquid cavity; 621, convex column; 622, guide hole; 623, second stop ring; 63, side liquid injection hole; 64, lower liquid injection hole; 65, opposite electrode; 66, tip body; 661, guide rod; 662, third stop ring; 663, second spring; 7, first spring; 8, dragon shaft; 9, spline structure. DETAILED DESCRIPTION

[0036] The preferred embodiments of the application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the application, and are not used to limit the application.

[0037] Reference Figs. 1 to 5 An underwater piling device, comprising a drive mechanism 1, a main rod 2, a barrel rod 3, a rotary digging barrel 4, an insertion rod 5, and a plug 6; the main rod 2 and the barrel rod 3 are both hollow pipe structures; the drive mechanism 1 supports and drives the main rod 2 to rotate and press downward, and the barrel rod 3 is sleeved in the main rod 2; and the barrel rod 3 and the main rod 2 are linked through the spline structure 9 which can axially relatively move but rotationally interfere, and a first spring 7 is arranged between the barrel rod 3 and the main rod 2 to limit the relative axial movement distance of the barrel rod 3 and the main rod 2; the main rod 2 is fixedly connected with the upper end of the rotary digging barrel 4; the insertion rod 5 is fixedly connected with the lower part in the rotary barrel 4 through a connecting rod 51; the plug 6 is fixedly connected with the lower end of the insertion rod 5; a dragon shaft 8 is rotatably sleeved in the barrel rod 3; the lower end of the dragon shaft 8 extends into the rotary digging barrel 4, and the upper end extends to the side soil outlet on the main rod 2; the rotation direction of the dragon shaft 8 is opposite to the rotation direction of the main rod 2.

[0038] Further, a first stop ring 31 is fixed on the outer circumference of the barrel rod 3 below the main rod 2; and the first spring 7 is sleeved outside the barrel rod 3 between the first stop ring 31 and the lower end surface of the main rod 2.

[0039] Further, a horn-shaped upper soil guide 41 with a large lower end and a small upper end is arranged in the rotary digging barrel 4; the upper end of the upper soil guide 41 is in communication with the lower end of the barrel rod 3, and the lower end is fixedly connected with the inner wall of the rotary digging barrel 4.

[0040] Further, the upper earth guiding part 41 is further provided with a lower earth guiding part 42; the lower earth guiding part 42 is also trumpet-shaped with a smaller upper end and a larger lower end; the upper end of the lower earth guiding part 42 is fixed on the middle part of the upper earth guiding part 41 and the lower end of the lower earth guiding part 42 is fixed on the inner wall of the rotary digging barrel 4 below the lower end of the upper earth guiding part 41.

[0041] Further, the inner surfaces of the upper earth guiding part 41 and the lower earth guiding part 42 are convexly curved towards the shaft center.

[0042] Further, the plug 6 comprises a plug main body 61 and a tip body 66; the upper end of the plug main body 61 is fixedly connected with the lower end of the insertion rod 5; the plug main body 61 is provided with a liquid cavity 62; a plurality of side liquid injection holes 63 are uniformly arranged on the outer circumferential surface of the plug main body 61; the side liquid injection holes 63 are communicated with the liquid cavity 62 from the side surface of the plug main body 61; the lower end of the plug main body 61 is provided with a lower liquid injection hole 64; the lower liquid injection hole 64 is communicated with the liquid cavity 62 from the lower end surface of the plug main body 61; a counter electrode 65 is arranged in the liquid cavity 62; an external circuit applies a strong electric field to the liquid in the liquid cavity 62 through the counter electrode 65 to form a liquid-electric effect.

[0043] Further, the tip body 66 is fixedly connected with a guide rod 661 at the top; a convex column 621 is arranged at the top center of the liquid cavity 62; a guide hole 622 with an open lower end is vertically arranged at the center of the convex column 621; a second stop ring 623 is arranged at the lower part of the guide hole 622; the guide rod 661 extends into the guide hole 622 through the second stop ring 623 at the upper part; a third stop ring 662 is arranged at the upper end of the guide rod 661; the third stop ring 662 interferes with the second stop ring 623; a second spring 663 is connected between the upper end of the guide rod 661 and the upper end of the guide hole 622; in the static state, the second spring 663 makes the tip body 66 pre-tighten at the lower end of the plug main body 61; the outer diameter of the upper end of the tip body 66 is the same as that of the lower end of the plug main body 61.

[0044] Further, the side liquid injection hole 63 is inclined upward from inside to outside and gradually decreases in diameter; the lower liquid injection hole 64 gradually decreases in diameter from inside to outside.

[0045] Further, the convex column 621 opposite to the side liquid injection hole 63 is a concave rotary structure facing the side liquid injection hole 63; the top of the liquid cavity 62 opposite to the lower liquid injection hole 64 is a concave rotary structure facing the lower liquid injection hole 64; the upper end surface of the tip body 66 is a concave rotary structure facing the side surface; the rotary structure is used to reflect the liquid shock wave.

[0046] An underwater piling method and an underwater piling device are provided.

[0047] ①The driving mechanism 1 drives the main rod 2 to rotate, the main rod 2 drives the cylinder rod 3 to rotate through the spline structure 9, the cylinder rod 3 drives the rotary digging cylinder 4 to rotate, and the rotary digging cylinder 4 rotates to dig the rock and soil underwater, in which process the plug 6 is firstly inserted into the rock and soil underwater; the external water flows into the liquid cavity 62 through the side liquid injection hole 63 and fills the liquid cavity 62;

[0048] ②The external circuit applies a strong electric field to the water in the liquid cavity 62 through the relative electrode 65, the high-voltage strong electric field passes through the water, and the water in the discharge channel is rapidly vaporized and expanded and causes an explosion due to the instantaneous release of huge energy, thereby forming a liquid-electric effect;

[0049] ③The explosion impact force generated by the liquid-electric effect causes the water in the liquid cavity 62 to be ejected from the side liquid injection hole 63 and the lower liquid injection hole 64, in which process, the impact water flow pushes the sharp body 66 and the guide rod 661 downward to overcome the pulling force of the second spring 663, so as to expose the lower liquid injection hole 64 and guide and reflect the high-speed water flow ejected outward through the concave rotary structure on the upper end surface of the sharp body 66; the high-speed water flow ejected outward loosens, destroys or softens the rock and soil structure around the plug 6, and the loosened, destroyed or softened rock and soil facilitates the subsequent rotary digging cylinder 4 to dig the rock and soil; at the same time, in this process, the plug body 61 is subjected to an upward recoil force, which is sequentially transmitted to the plug rod 5, the connecting rod 51, the rotary digging cylinder 4 and the cylinder rod 3 and compresses the first spring 7, so that the rotary digging cylinder 4 generates a jumping action upward and a squeezing action downward when the first spring 7 returns, thereby forming a jumping action following each water flow injection, which not only can carry the soil outward, but also can further loosen, destroy or soften the rock and soil structure, and can reduce the huge friction force caused by the tight extrusion of the rock and soil structure on the rotary digging cylinder 4;

[0050] ④After each water flow injection is completed, the second spring 663 returns to pull the guide rod 661 and the sharp body 66 upward to move upward, so that the sharp body 66 re-closes the lower end of the lower liquid injection hole 64 and the plug 6 forms an integral whole, thereby facilitating the plug 6 to be inserted downward again;

[0051] ⑤During the rotary digging process of the rotary digging cylinder 4, the rock and soil is guided by the lower soil guide 42 and the upper soil guide 41 to converge at the dragon shaft 8 in the upper middle part of the rotary digging cylinder 4, the dragon shaft 8 synchronously rotates in the opposite direction to transport the rock and soil upward from the middle of the cylinder rod 3 and discharge the rock and soil from the side soil discharge port on the main rod 2; and since the connecting rod 51 is fixed on the lower soil guide 42, the recoil force generated by the water flow injection also acts on the lower soil guide 42 and the upper soil guide 41 instantaneously, thereby shaking the rock and soil adhered to the surface of the lower soil guide 42 and the upper soil guide 41 to avoid blocking the rock and soil convergence channel.

[0052] Finally, it should be noted that the above only describes the preferred examples of the present application, and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the technical solutions described in the foregoing embodiments, or some of the technical features thereof can be replaced equivalently, without departing from the spirit and principle of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An underwater pile driving apparatus, characterized by: The utility model provides a kind of rotary excavator, including drive mechanism (1), main rod (2), cylinder rod (3), rotary digging cylinder (4), insert rod (5) and plug (6);The main rod (2) and cylinder rod (3) are all hollow tube structure;The drive mechanism (1) supports and drives main rod (2) rotation and extrusion downward, the cylinder rod (3) is set in main rod (2);And the cylinder rod (3) with main rod (2) pass through the spline structure (9) of axially relative movement but rotation interference linkage, first spring (7) is arranged between cylinder rod (3) and main rod (2) to limit the relative axial movement distance of cylinder rod (3) and main rod (2);The main rod (2) is fixedly connected with the upper end of rotary digging cylinder (4);The insert rod (5) is fixed in rotary cylinder (4) lower portion by connecting rod (51);The plug (6) is fixed in the lower end of insert rod (5);The cylinder rod (3) is rotatably set with a julong shaft (8);The lower end of julong shaft (8) extends into rotary digging cylinder (4), and the upper end extends to the side soil outlet on main rod (2);The rotation direction of julong shaft (8) is opposite to the rotation direction of main rod (2);The plug (6) includes plug main body (61) and sharp part body (66);The upper end of plug main body (61) is fixedly connected with the lower end of insert rod (5);The plug main body (61) is provided with liquid cavity (62);The outer circumferential surface of plug main body (61) is evenly provided with a plurality of side liquid injection holes (63);The side liquid injection hole (63) is communicated with liquid cavity (62) from the side surface of plug main body (61);The lower end of plug main body (61) is provided with lower liquid injection hole (64);The lower liquid injection hole (64) is communicated with liquid cavity (62) from the lower end surface of plug main body (61);Opposite electrode (65) is arranged in liquid cavity (62);An external circuit applies strong electric field to liquid in liquid cavity (62) through opposite electrode (65), and forms liquid-electric effect.

2. An underwater pile driving apparatus as claimed in claim 1, wherein: The outer circumference of the cylinder rod (3) below the main rod (2) is fixed with a first stop ring (31);The first spring (7) is set on the cylinder rod (3) outside between the first stop ring (31) and the lower end surface of the main rod (2).

3. An underwater pile driving apparatus as claimed in claim 2, wherein: A horn-shaped upper soil guide (41) with small upper end and large lower end is arranged in the rotary digging cylinder (4);The upper end of the upper soil guide (41) is communicated with the lower end of the cylinder rod (3), and the lower end is fixedly connected with the inner wall of the rotary digging cylinder (4).

4. An apparatus as claimed in claim 3, wherein: A lower soil guide (42) is further arranged below the upper soil guide (41);The lower soil guide (42) is also horn-shaped with small upper end and large lower end;The upper end diameter of the lower soil guide (42) is larger than that of the upper soil guide (41), and the upper end is fixed in the middle of the upper soil guide (41);The lower end of the lower soil guide (42) is fixed on the inner wall of the rotary digging cylinder (4) below the lower end of the upper soil guide (41).

5. An apparatus as claimed in claim 4, wherein: The inner surfaces of the upper soil guide (41) and the lower soil guide (42) are convex cambered surfaces protruding towards the axis.

6. An apparatus as claimed in claim 5, wherein: The tip body (66) is fixedly connected with a guide rod (661) at the top; a convex column (621) is arranged at the top center of the liquid cavity (62); a guide hole (622) with an open lower end is vertically arranged at the center of the convex column (621); a second stop ring (623) is arranged at the lower part of the guide hole (622); the guide rod (661) extends into the guide hole (622) through the second stop ring (623); a third stop ring (662) is arranged at the upper end of the guide rod (661); the third stop ring (662) interferingly matches with the second stop ring (623); a second spring (663) is arranged between the upper end of the guide rod (661) and the upper end of the guide hole (622); in the static state, the second spring (663) makes the tip body (66) be pressed and pre-tightened at the lower end of the plug main body (61); the outer diameter of the upper end of the tip body (66) is the same as the outer diameter of the lower end of the plug main body (61).

7. An apparatus as claimed in claim 6, wherein: The side liquid injection hole (63) is inclined upward and gradually reduced in diameter from inside to outside; the lower liquid injection hole (64) is gradually reduced in diameter from inside to outside.

8. An apparatus as claimed in claim 7, wherein: The convex column (621) opposite to the side liquid injection hole (63) is a concave rotary structure facing the side liquid injection hole (63); the top of the liquid cavity (62) opposite to the lower liquid injection hole (64) is a concave rotary structure facing the lower liquid injection hole (64); the upper end surface of the tip body (66) is a concave rotary structure facing the side; the rotary structure is used for reflecting liquid shock wave.

9. An apparatus as claimed in claim 8, wherein: The pile driving method of the pile driving device comprises the following steps: ①The driving mechanism (1) drives the main rod (2) to rotate, the main rod (2) drives the cylinder rod (3) to rotate through the spline structure (9), the cylinder rod (3) drives the rotary digging cylinder (4) to rotate, and the rotary digging cylinder (4) digs the underwater rock and soil, in which process, the plug (6) is firstly inserted into the underwater rock and soil; external water flows into the liquid cavity (62) through the side liquid injection hole (63) to fill the liquid cavity (62); ②The external circuit applies a strong electric field to the water in the liquid cavity (62) through the relative electrode (65), the high-voltage strong electric field passes through the water, because of the instantaneous release of huge energy in the discharge channel, the water in the channel is rapidly vaporized, expanded and exploded to form a liquid-electric effect; ③The explosion impact force generated by the liquid-electric effect makes the water in the liquid cavity (62) shoot out from the side jetting liquid cavity (63) and the lower jetting liquid hole (64). In this process, the impact water flow pushes the tip body (66) and the guide rod (661) downward to overcome the pulling force of the second spring (663), so as to make the lower jetting liquid hole (64) exposed and guided and reflected to the side by the concave rotary structure on the upper end surface of the tip body (66); the high-speed water flow sprayed outward loosens, destroys or softens the rock-soil structure around the plug (6), and the loosened, destroyed or softened rock-soil facilitates the subsequent excavation of the rock-soil by the rotary digging barrel (4); at the same time, in this process, the plug body (61) is subjected to an upward recoil force, which is sequentially transmitted to the connecting rod (51), the rotary digging barrel (4) and the barrel rod (3) through the plug (5), and compresses the first spring (7), so that the rotary digging barrel (4) generates an upward bouncing action and a downward extrusion action when the first spring (7) returns, thereby forming a bouncing action following each water flow spraying, which not only can carry soil outward, but also can further loosen, destroy or soften the rock-soil structure, and can reduce the huge friction force caused by the tight extrusion of the rock-soil structure on the rotary digging barrel (4); ④After each water flow spraying is completed, the second spring (663) returns to pull the guide rod (661) and the tip body (66) upward to move upward, so that the tip body (66) re-closes the lower end of the lower jetting liquid hole (64) and forms an integral plug (6), which is convenient for re-inserting downward; ⑤During the rotary digging process of the rotary digging barrel (4), the rock-soil is guided by the lower soil guide (42) and the upper soil guide (41) to converge at the Jiaolong shaft (8) in the upper middle part of the rotary digging barrel (4), and the Jiaolong shaft (8) rotates synchronously in the opposite direction to transport the rock-soil upward from the middle of the barrel rod (3) and discharge it from the side soil discharge port on the main rod (2); and since the connecting rod (51) is fixed on the lower soil guide (42), the recoil force generated by the water flow spraying also acts on the lower soil guide (42) and the upper soil guide (41) instantaneously, which shakes off the rock-soil adhered to the surface of the lower soil guide (42) and the upper soil guide (41), thereby avoiding the blockage of the rock-soil convergence channel.

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