Semi-submersible type river channel expanding excavation platform and expanding excavation method

Abstract

The invention relates to the technical field of riverway dredging, in particular to a semi-submersible type riverway expanding excavation platform and an expanding excavation method.The expanding excavation platform comprises a semi-submersible type platform body, an expanding excavation platform body and an expanding excavation platform body, the first end of the winch mechanism is connected to the semi-submersible platform, and the second end of the winch mechanism extends into the mounting hole; the expanding excavation device comprises a milling excavation arm, a rotation unit, a supporting arm, a slurry discharging assembly and a swing driving part; the embedded pile body positioning mechanism comprises a drilling frame, a pile lifting assembly and a fixed pile, the drilling frame is fixed on the semi-submersible platform, the fixed pile penetrates through the semi-submersible platform and extends into a riverbed, and the pile lifting assembly is connected between the drilling frame and the fixed pile. Through the milling and excavating arm provided with the slurry discharging assembly, synchronous operation of excavating and deslagging can be achieved, modular design can be adopted for the semi-submersible platform, single-platform serial operation can be changed into multi-platform parallel operation through platform expansion and combination, and the expanding and excavating efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of river dredging, and in particular to a semi-submersible river channel enlargement platform and an enlargement method. Background Art

[0002] With the continuous increase in inland river cargo volume, it is necessary to expand the river channel or build a new canal to facilitate the navigation of ships with larger carrying capacity and deeper draft, and to improve the grade and navigation capacity of inland waterways. In the field of dredging technology, the cutter suction dredger is the most commonly used operating ship. Generally, small cutter suction dredgers can only be used for excavation of silty or sandy riverbeds. For hard rock riverbeds, large cutter suction dredgers are required. Large cutter suction dredgers have high cutter power and rely on rope anchors on both sides to pull the hull around fixed piles for sweeping excavation. They need to occupy a large width of water area. Operations in inland rivers with limited width often affect river navigation. The existing channel expansion for inland rivers with hard rock riverbeds is mainly based on underwater drilling and blasting. As environmental protection requirements become increasingly stringent, this method is gradually restricted. Based on rock breaking principles such as impact, milling, intensive drilling + strong excavation, new non-explosive excavation ships such as heavy hammer impact ships, high-frequency crushing ships, milling ships, backhoe dredgers, etc. have gradually emerged and have been used in projects such as the Xijiang River Basin and Pinglu Canal. Among them, the backhoe dredger itself does not have the ability to directly break hard rock. It is necessary to cooperate with intensive drilling to process the riverbed into a honeycomb shape to increase the air surface for rock breaking before excavating the riverbed. Other ship types only have excavation capabilities, and they need to be equipped with grab ships for slag cleaning later. The process is complicated. The above-mentioned ship types generally have problems such as discontinuous operation, complex process and low excavation efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a semi-submersible river channel expansion platform and expansion method to solve the technical problems of discontinuous operation, complex process and low excavation efficiency in the existing river channel expansion ship type. The specific technical solution is as follows:

[0004] The present invention provides a semi-submersible river channel expansion and excavation platform, comprising: a semi-submersible platform, which is provided with a mounting hole; a winch mechanism, a first end of the winch mechanism is connected to the semi-submersible platform, and a second end of the winch mechanism extends into the mounting hole; an expansion and excavation device, which comprises a milling arm, a slewing unit, a support arm, a slurry discharge assembly and a swing driving member, the first end of the support arm is slidably connected to the hole wall of the mounting hole, the second end of the winch mechanism is connected to the support arm, the slewing unit is connected to the second end of the support arm, the milling arm is connected to the slewing unit, the swing driving member is connected between the milling arm and the slewing unit, and the slurry discharge assembly is installed on the milling arm; an embedded pile body positioning mechanism, the embedded pile body positioning mechanism comprises a drill rig, a pile lifting assembly and a fixed pile, the drill rig is fixed to the semi-submersible platform, the fixed pile passes through the semi-submersible platform and extends into the riverbed, and the pile lifting assembly is connected between the drill rig and the fixed pile.

[0005] A further improvement of the semi-submersible river channel expansion platform of the present invention is that the semi-submersible platform comprises an upper platform, an intermediate column and a pontoon, the intermediate column is connected between the upper platform and the pontoon, and the mounting hole is arranged on the upper platform.

[0006] A further improvement of the semi-submersible river channel expansion platform of the present invention is that a power head for driving the fixed piles to rotate is provided on the top of the upper platform.

[0007] A further improvement of the semi-submersible river channel expansion platform of the present invention is that a stabilizing plate for locking and fixing piles is provided at the bottom of the upper platform.

[0008] A further improvement of the semi-submersible river channel expansion platform of the present invention is that the pile lifting assembly includes a pile lifting winch and a pulley, the pile lifting winch is installed on the first side of the drilling rig, the fixed pile is located on the second side of the drilling rig, the pulley is installed on the top of the drilling rig, and the winch rope of the pile lifting winch is wound around the drilling rig and then connected to the fixed pile.

[0009] A further improvement of the semi-submersible river channel expansion platform of the present invention is that a pusher for pushing the fixed pile to impact downward is provided on the top of the fixed pile, and the hoisting rope of the pile lifting hoist is connected to the pusher.

[0010] A further improvement of the semi-submersible channel expansion platform of the present invention is that a tightening device for tightening the pile hole wall is provided at the bottom of the fixed pile, and the tightening device includes an expansion driving member and an expansion block, and the expansion driving member is connected between the fixed pile and the expansion block.

[0011] A further improvement of the semi-submersible river channel expansion platform of the present invention is that a down-the-hole hammer for breaking rocks is provided at the bottom of the expander.

[0012] A further improvement of the semi-submersible river channel expansion platform of the present invention is that a slide groove is provided on the hole wall of the mounting hole, and a tightening device is provided at the first end of the support arm, and the tightening device includes a tightening drive member and a tightening shoe, the first end of the tightening drive member is connected to the first end of the support arm, the second end of the tightening drive member is connected to the tightening shoe, and the tightening shoe is slidably connected in the slide groove.

[0013] The present invention also provides an excavation method using the semi-submersible river channel excavation platform as described above, combining N sequence holes into a rectangular excavation area through S-shaped displacement, specifically comprising the following steps:

[0014] S1. Use external equipment to drag the platform to the rectangular excavation area;

[0015] S2, lowering the fixed pile (405) through the pile lifting assembly so that the bottom of the fixed pile (405) contacts the riverbed (11), increasing the weight of the semi-submersible platform (1), and applying rock breaking pressure to the fixed pile (405), so that the fixed pile (405) drills downward into the riverbed (11);

[0016] S3, adjusting the winch mechanism (2), lowering the digging device (3) to the starting height, and supporting the support arm (303) tightly against the wall of the installation hole (104) to start digging, specifically including:

[0017] S3.1. Start excavating the jth layer of the i-th hole to a predetermined depth, where i is a natural number greater than or equal to 1 and less than or equal to N, and j is a natural number greater than or equal to 1;

[0018] S3.2, determine whether the excavation of the i-th hole has reached the designed excavation depth, if so, proceed to S4, otherwise, proceed to the next step;

[0019] S3.3, take j=j+1, lower the digging device (3) by an equal distance by adjusting the winch mechanism (2), and return to S3.1;

[0020] S4, make a determination, if i is greater than N, then complete the excavation of all holes; if i is less than N, then take i=i+1, pull the fixed pile (405) out of the pile hole (10) by the pile lifting assembly, use the external equipment to drag the semi-submersible platform (1) to the i-th hole, and return to step S2;

[0021] S5. Complete the excavation of the entire river channel.

[0022] The application of the technical solution of the present invention has the following beneficial effects:

[0023] The semi-submersible river channel expansion platform of the present invention can realize the synchronous operation of excavation and slag discharge through the milling arm equipped with the slurry discharge assembly, which is more efficient than the traditional impact crushing dredger; the semi-submersible platform can adopt a modular design, and through the platform expansion combination, it can be changed from a single platform serial operation to a multi-platform parallel operation, thereby improving the expansion efficiency and solving the technical problems of the existing river channel expansion ship type, such as discontinuous operation, complex process and low excavation efficiency. The present invention is provided with a pile positioning mechanism that can automatically enter the rock to solve the reaction force problem during hard rock excavation. It adopts a downward milling excavation method. Compared with the traditional sweeping excavation of the cutter suction ship, it does not need to set up side anchor ropes, occupies less river channel, and does not affect navigation.

[0024] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 This is a front view of the semi-submersible river channel expansion platform of the present invention (A is the direction of water flow);

[0027] Figure 2 This is a side view of the semi-submersible river channel expansion platform of the present invention (B is the direction of water flow)

[0028] Figure 3 It is a top view of the semi-submersible river channel expansion platform (two groups of fixed piles) of the semi-submersible river channel expansion platform of the present invention;

[0029] Figure 4 It is a top view of the semi-submersible river channel expansion platform (four groups of fixed piles) of the semi-submersible river channel expansion platform of the present invention;

[0030] Figure 5 It is a three-dimensional diagram of a semi-submersible platform of the semi-submersible river channel expansion platform of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the embedded pile positioning mechanism of the semi-submersible river channel expansion platform of the present invention;

[0032] Figure 7 yes Figure 4 Enlarged view of circle C in the middle;

[0033] Figure 8 yes Figure 6 Enlarged view of circle D in the middle;

[0034] Fig. 9 It is a single-group platform serial operation route map of the semi-submersible river channel expansion method of the present invention (E is the operation area, and F is the navigation area);

[0035] Fig.10 It is a single-group platform parallel operation route map of the semi-submersible river channel expansion method of the present invention (E is the operation area, and F is the navigation area);

[0036] Fig.11 It is a schematic diagram of circular profile excavation of the semi-submersible river channel expansion method of the present invention;

[0037] Fig.12 It is a schematic diagram of rectangular profile excavation of the semi-submersible river channel expansion method of the present invention.

[0038] Among them, 1. semi-submersible platform; 101. upper platform; 102. middle column; 103. pontoon; 104. mounting hole; 105. slideway; 2. winch mechanism; 3. expansion device; 301. milling arm; 302. rotary unit; 303. support arm; 304. slurry pump; 305. slurry pipe; 306. swing drive; 307. tightening device; 3071. tightening drive; 3072. shoe; 4. embedded pile body fixed Positioning mechanism; 401, pulley; 402, drilling rig; 403, pile hoist; 404, pusher; 405, fixed pile; 406, power head; 407, stabilizing plate; 408, expansion device; 4081, expansion drive; 4082, expansion block; 409, down-the-hole hammer; 5, mud-water separation system; 6, control center; 7, electrical and hydraulic system; 8, generator set; 9, excavation profile; 10, pile hole; 11, riverbed; 12, mud barge. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] See also Figures 1 to 12 As shown, a semi-submersible river channel expansion and excavation platform comprises: a semi-submersible platform 1, wherein the semi-submersible platform 1 is provided with a mounting hole 104; a winch mechanism 2, wherein a first end of the winch mechanism 2 is connected to the semi-submersible platform 1, and a second end of the winch mechanism 2 extends into the mounting hole 104; an expansion and excavation device 3, wherein the expansion and excavation device 3 comprises a milling arm 301, a rotary unit 302, a support arm 303, a slurry discharge assembly and a swing drive member 306, wherein a first end of the support arm 303 is slidably connected to a hole wall of the mounting hole 104, a second end of the winch mechanism 2 is connected to the support arm 303, and the rotary unit 302 is connected to a support arm 303. Unit 302 is connected to the second end of the support arm 303, the milling arm 301 is connected to the rotating unit 302, the swing driving member 306 is connected between the milling arm 301 and the rotating unit 302, and the slurry discharge assembly is installed on the milling arm 301; an embedded pile body positioning mechanism 4, the embedded pile body positioning mechanism includes a drill frame 402, a pile lifting assembly and a fixed pile 405, the drill frame 402 is fixed on the semi-submersible platform 1, the fixed pile 405 passes through the semi-submersible platform 1 and extends into the riverbed 11, and the pile lifting assembly is connected between the drill frame 402 and the fixed pile 405.

[0041] Specifically, Figure 4 and Figure 5 As shown, the number of the winch mechanisms 2 is at least three, and at least three winch mechanisms 2 are evenly arranged along the circumference of the mounting hole 104. The number of the embedded pile positioning mechanisms 4 is at least two, and at least two winch mechanisms 2 are evenly arranged along the circumference at the edge of the semi-submersible platform 1. In this embodiment, the number of the winch mechanisms 2 and the number of the embedded pile positioning mechanisms 4 are both four.

[0042] The semi-submersible river channel expansion platform also includes a mud-water separation system 5, a control center 6, an electric hydraulic system 7 and a generator set 8, and the connection method can be set according to the existing technology. The slurry discharge assembly includes a slurry discharge pump 304 and a slurry discharge pipe 305, which discharges the excavated slag in the form of a mixture to the mud-water separation system 5 on the platform, and then the mud-water separation system 5 discharges it to the mud barge 12 for transportation, so as to realize the synchronous operation of excavation, slag discharge and slag-water separation. The generator set 8 provides power for the expansion operation. The expansion device 3 is suspended from the mounting hole 104 through the winch mechanism 2 on the upper part of the platform. When the excavation is completed to a certain depth, the expansion device 3 can be lowered through the winch mechanism 2, and the slag discharge and slag-water separation operations are completed while excavating. The embedded pile body positioning mechanism 4 can automatically sink the fixed pile 405 into the rock body of the riverbed 11, and the platform is stably fixed on the riverbed 11. The reaction force generated by the expansion device 3 during milling is transmitted to the semi-submersible platform 1 through the tightening device 307 on the support arm 303.

[0043] The swing drive member 306 can be a linear drive member such as an oil cylinder, an air cylinder or an electric drive member. In this embodiment, the swing drive member 306 is an oil cylinder. The milling arm 301 performs swing milling under the drive of the swing oil cylinder and rotates around the vertical axis under the drive of the rotary unit 302 to form a circular excavation profile 9 (such as Fig.11 As shown in FIG. 1 , when a certain depth is excavated downward, the expansion device 3 is lowered by the winch mechanism 2 to complete the step change. When the expansion device 3 adopts equal radius excavation, its excavation profile 9 is circular. Preferably, as shown in FIG. Fig.12 As shown, when the milling arm 301 adopts non-uniform radius excavation, it can imitate a rectangular profile. Compared with a circular profile, a rectangular profile has a smaller repeated excavation area, which can improve the excavation efficiency. Optionally, the excavation device 3 can also realize rectangular profile excavation through a track-type translation mechanism.

[0044] The present invention can achieve the deepening and expansion of inland river channels through downward excavation + shifting operation. The present invention has the characteristics of synchronous excavation and slag discharge by a cutter suction vessel and small occupation of the river channel by an inland dredger, and is particularly suitable for expanding the hard riverbed 11 in an inland river with a limited water area. At the same time, the platform has the characteristics of modular expansion, which greatly improves the efficiency of inland river expansion.

[0045] Preferably, Figure 3 As shown, the semi-submersible platform 1 includes an upper platform 101, an intermediate column 102 and a pontoon 103. The intermediate column 102 is connected between the upper platform 101 and the pontoon 103, and the mounting hole 104 is provided on the upper platform 101. The pontoon 103 is a hollow structure, and the buoyancy of the entire semi-submersible platform 1 is controlled by adjusting the amount of water stored inside, so as to ensure the stability of the semi-submersible platform 1 during displacement and prevent the semi-submersible platform 1 from being submerged.

[0046] Preferably, Figure 6 As shown, a power head 406 for driving the fixed pile 405 to rotate is provided on the top of the upper platform 101. In this embodiment, the fixed pile 405 can be a steel pile. A stabilizing plate 407 for locking the fixed pile 405 is provided at the bottom of the upper platform 101. The pile lifting assembly includes a pile lifting winch 403 and a pulley 401. The pile lifting winch 403 is installed on the first side of the drilling frame 402, and the fixed pile 405 is located on the second side of the drilling frame 402. The pulley 401 is installed on the top of the drilling frame 402. The winch rope of the pile lifting winch 403 is wound around the drilling frame 402 and then connected to the fixed pile 405. In order to ensure that both sides of the drilling frame 402 have a certain amount of activity space, the top of the drilling frame 402 is set in a Y shape, and pulleys 401 are provided on both sides, so as to facilitate the winding of the winch rope of the pile lifting winch 403. The winch rope of the pile lifting winch 403 generally adopts a steel wire rope.

[0047] Preferably, a pusher 404 is provided on the top of the fixed pile 405 for pushing the fixed pile 405 downward, and the hoisting rope of the pile hoist 403 is connected to the pusher 404. Figure 8 As shown, the bottom of the fixed pile 405 is provided with an expander 408 for tightening the wall of the pile hole 10, and the expander 408 includes an expansion drive 4081 and an expansion block 4082. The expansion drive 4081 is connected between the fixed pile 405 and the expansion block 4082. A down-the-hole hammer 409 for breaking rock is provided at the bottom of the expander 408. The expansion drive 4081 can be a linear drive such as an oil cylinder, an air cylinder or an electric drive. In this embodiment, the expansion drive 4081 is an oil cylinder. Before excavation, by adjusting the buoyancy of the pontoon 103, the down-the-hole hammer 409 contacts the rock surface of the riverbed 11 and applies a certain pressure. The down-the-hole hammer 409 impacts downward to break the rock and rotates under the drive of the power head 406. The pusher 404 pushes the fixed pile 405 to continue to impact downward to form a pile hole 10 of a certain depth. The expansion drive 4081 extends and presses the expansion block 4082 tightly against the hole wall of the pile hole 10. The fixed pile 405 has the characteristics of both a drill rod and a positioning pile. The down-the-hole hammer 409 can be driven to rotate under the drive of the power head 406. After the expansion device 408 is expanded, it is used to withstand the expansion reaction force from the platform. The number of fixed piles 405 can be two or more groups. The down-the-hole hammer 409 can be replaced with a spiral drill bit or other common hard rock drill bits as needed. The fixed pile 405 can also use equipment such as a pile gripper to clamp the steel pile and pull out the pile hole 10 using a hydraulic cylinder.

[0048] Preferably, Figure 7As shown, a slide groove 105 is provided on the hole wall of the mounting hole 104, and a tightening device 307 is provided at the first end of the support arm 303, and the tightening device 307 includes a tightening driving member 3071 and a tightening shoe 3072. The first end of the tightening driving member 3071 is connected to the first end of the support arm 303, and the second end of the tightening driving member 3071 is connected to the tightening shoe 3072, and the tightening shoe 3072 is slidably connected in the slide groove 105. The expansion device 3 can slide up and down along the slide groove 105 through the tightening shoe 3072. Under the drive of the tightening oil cylinder, the tightening shoe 3072 tightens the slide groove 105, and the reaction force of the milling arm 301 when excavating is transmitted to the semi-submersible platform 1 through the slide groove 105 of the tightening device 307 of the support arm 303.

[0049] The present invention also provides an excavation method using the semi-submersible channel excavation platform as described above, first using a down-the-hole hammer 409 to drill holes and fix the platform to the bedrock of the riverbed 11, then using the excavation device 3 to excavate downwards, and at the same time separating the rock slag on the platform, after excavating to the designed depth, the platform is horizontally shifted and the above positioning and excavation steps are repeated to achieve the expansion and deepening of the entire river channel. The semi-submersible channel excavation platform provided by the present invention has the advantages of reliable positioning, synchronous excavation and slag removal, and can be excavated in parallel through parallel operation mode through parallel connection of platform modules, as well as S-shaped displacement or parallel linear displacement expansion, thereby improving the expansion efficiency. Compared with traditional suction dredgers, it occupies less river channels and does not affect river navigation. N sequence holes are combined into a rectangular excavation area through S-shaped displacement, and the specific steps are as follows:

[0050] S1. Use external equipment (such as tugboat) to tow the platform to the rectangular excavation area, such as position ①;

[0051] S2, lower the fixed pile 405 through the pile lifting assembly, make the down-the-hole hammer 409 contact the riverbed 11, inject water into the pontoon 103, increase the weight of the platform, and apply rock breaking pressure to the down-the-hole hammer 409; the down-the-hole hammer 409 impacts downward to break the rock, and the pusher 404 pushes the steel pile downward to drill a pile hole 10 of a certain depth, and the depth of the pile hole 10 is sufficient for the expander 408 to enter the rock mass;

[0052] S3, the expansion device 408 expands the pile hole 10, the stabilizing plate 407 at the bottom of the upper platform 101 locks the steel pile, the winch mechanism 2 is adjusted, the expansion device 3 is lowered to the starting height, the support arm 303 is supported tightly on the hole wall of the installation hole 104, and excavation is carried out, which includes:

[0053] S3.1. Start excavating the jth layer of the i-th hole to a predetermined depth, i is a natural number greater than or equal to 1 and less than or equal to N (in this embodiment, N is 9), and j is a natural number greater than or equal to 1. In this embodiment, start excavating the first layer of the ①-th hole. When the excavation reaches the predetermined depth, the excavation device 3 is lowered by adjusting the winch mechanism 2 to an equal distance, and the second layer is opened, and the excavation and lowering are cyclically performed, and the cycle is repeated until the ①-th hole is excavated to the designed excavation depth. Fig. 9 As shown;

[0054] S3.2, determine whether the excavation of the i-th hole has reached the designed excavation depth, if so, proceed to S4, otherwise, proceed to the next step;

[0055] S3.3, take j=j+1, lower the digging device 3 by an equal distance by adjusting the winch mechanism 2, and return to S3.1;

[0056] S4, if i is greater than N, then all holes are excavated; if i is less than N, then i=i+1 is taken, the tensioner 408 is loosened, the steel pile is pulled out of the pile hole 10 by the pile lifting winch 403, and the semi-submersible platform 1 is towed to the i-th sequence hole (e.g., sequence hole ②) by external equipment (e.g., tugboat), and the process returns to step S2;

[0057] S5. In this embodiment, the ①th to 9th holes are combined into a rectangular excavation area (length L×width W) to complete the excavation of the entire river channel area.

[0058] like Fig.10 As shown, in step S5, multiple groups of platforms can be connected in parallel. Taking three groups of platforms in parallel as an example, the first group of platforms shifts from ①-1 to ①-3, the second group of platforms shifts from ②-1 to ②-3, and the third group of platforms shifts from ③-1 to ③-3. In theory, this parallel operation scheme can improve the excavation efficiency by M times, and the number of M is equal to the number of platforms.

[0059] The semi-submersible river channel expansion platform of the present invention can realize the synchronous operation of excavation and slag discharge through the milling arm 301 equipped with a slurry discharge assembly, which is more efficient than the traditional impact crushing dredger; the semi-submersible platform 1 can adopt a modular design, and through the platform expansion combination, it can be changed from a single-platform serial operation to a multi-platform parallel operation, thereby improving the expansion efficiency and solving the technical problems of the existing river channel expansion ship type, such as discontinuous operation, complex process and low excavation efficiency. The present invention is provided with a pile positioning mechanism that can automatically enter the rock to solve the reaction force problem during hard rock excavation. It adopts a downward milling excavation method. Compared with the traditional sweeping excavation of the suction dredger, it does not need to set up side anchor ropes, occupies less river channel, and does not affect navigation.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A semi-submersible river channel expansion platform, characterized in that: include: A semi-submersible platform (1), wherein the semi-submersible platform (1) is provided with a mounting hole (104); A winch mechanism (2), wherein a first end of the winch mechanism (2) is connected to the semi-submersible platform (1), and a second end of the winch mechanism (2) extends into the mounting hole (104); An expansion device (3), the expansion device (3) comprising a milling arm (301), a rotary unit (302), a support arm (303), a slurry discharge assembly and a swing drive member (306), the first end of the support arm (303) being slidably connected to the hole wall of the mounting hole (104), the second end of the winch mechanism (2) being connected to the support arm (303), the rotary unit (302) being connected to the second end of the support arm (303), the milling arm (301) being connected to the rotary unit (302), the swing drive member (306) being connected between the milling arm (301) and the rotary unit (302), and the slurry discharge assembly being mounted on the milling arm (301); An embedded pile body positioning mechanism (4), the embedded pile body positioning mechanism comprising a drilling frame (402), a pile lifting assembly and a fixed pile (405), the drilling frame (402) being fixed on the semi-submersible platform (1), the fixed pile (405) passing through the semi-submersible platform (1) and extending into the riverbed (11), and the pile lifting assembly being connected between the drilling frame (402) and the fixed pile (405).

2. The semi-submersible river channel expansion platform according to claim 1, characterized in that: The semi-submersible platform (1) comprises an upper platform (101), an intermediate column (102) and a pontoon (103); the intermediate column (102) is connected between the upper platform (101) and the pontoon (103); and the mounting hole (104) is provided on the upper platform (101).

3. The semi-submersible river channel expansion platform according to claim 2, characterized in that: A power head (406) for driving the fixed pile (405) to rotate is provided on the top of the upper platform (101).

4. The semi-submersible river channel expansion platform according to claim 2, characterized in that: A stabilizing plate (407) for locking the fixing pile (405) is provided at the bottom of the upper platform (101).

5. The semi-submersible river channel expansion platform according to claim 1, characterized in that: The pile lifting assembly comprises a pile lifting winch (403) and a pulley (401); the pile lifting winch (403) is installed on a first side of the drilling frame (402); the fixed pile (405) is located on a second side of the drilling frame (402); the pulley (401) is installed on the top of the drilling frame (402); and a winch rope of the pile lifting winch (403) is wound around the drilling frame (402) and then connected to the fixed pile (405).

6. The semi-submersible river channel expansion platform according to claim 5, characterized in that: A pusher (404) for pushing the fixed pile (405) downward is provided on the top of the fixed pile (405), and the hoisting rope of the pile lifting hoist (403) is connected to the pusher (404).

7. The semi-submersible river channel expansion platform according to claim 1, characterized in that: The bottom of the fixed pile (405) is provided with an expander (408) for tightening the wall of the pile hole (10), and the expander (408) comprises an expansion drive (4081) and an expansion block (4082), and the expansion drive (4081) is connected between the fixed pile (405) and the expansion block (4082).

8. The semi-submersible river channel expansion platform according to claim 7, characterized in that: A down-the-hole hammer (409) for breaking rocks is provided at the bottom of the expander (408).

9. The semi-submersible river channel expansion platform according to claim 1, characterized in that: A sliding groove (105) is provided on the hole wall of the mounting hole (104); a tightening device (307) is provided at the first end of the support arm (303); the tightening device (307) comprises a tightening driving member (3071) and a tightening shoe (3072); the first end of the tightening driving member (3071) is connected to the first end of the support arm (303); the second end of the tightening driving member (3071) is connected to the tightening shoe (3072); and the tightening shoe (3072) is slidably connected in the sliding groove (105).

10. A method for channel expansion using the semi-submersible channel expansion platform according to claim 1, characterized in that: Combining N sequence holes into a rectangular excavation area through S-shaped shifting specifically includes the following steps: S1. Use external equipment to drag the platform to the rectangular excavation area; S2, lowering the fixed pile (405) through the pile lifting assembly so that the bottom of the fixed pile (405) contacts the riverbed (11), increasing the weight of the semi-submersible platform (1), and applying rock breaking pressure to the fixed pile (405), so that the fixed pile (405) drills downward into the riverbed (11); S3, adjusting the winch mechanism (2), lowering the digging device (3) to the starting height, and supporting the support arm (303) tightly against the wall of the installation hole (104) to start digging, specifically including: S3.

1. Start excavating the jth layer of the i-th hole to a predetermined depth, where i is a natural number greater than or equal to 1 and less than or equal to N, and j is a natural number greater than or equal to 1; S3.2, determine whether the excavation of the i-th hole has reached the designed excavation depth, if so, proceed to S4, otherwise, proceed to the next step; S3.3, take j=j+1, lower the digging device (3) by an equal distance by adjusting the winch mechanism (2), and return to S3.1; S4, make a determination, if i is greater than N, then complete the excavation of all holes; if i is less than N, then take i=i+1, pull the fixed pile (405) out of the pile hole (10) by the pile lifting assembly, use the external equipment to drag the semi-submersible platform (1) to the i-th hole, and return to step S2; S5. Complete the excavation of the entire river channel.

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