A variable cross-section pipe segment sinking positioning system and method

Abstract

The present invention discloses a variable cross-section pipe segment sinking positioning system and method, comprising a total transmission wheel, an intelligent gyroscope, a driving wheel installed on the variable cross-section immersed pipe segment, an underwater driven wheel installed on an underwater base trench, and a mooring transmission device between the driven wheel and the underwater driven wheel; the total transmission wheel is arranged on an adjacent shore or on a ship; the intelligent gyroscope is arranged on the upper part of the variable cross-section immersed pipe segment to monitor the floating state of the variable cross-section pipe segment in real time; at the same time, water is poured into the ballast water tank inside the variable cross-section immersed pipe segment to sink it, and during the sinking process, the inclination posture of the variable cross-section immersed pipe segment is measured by the intelligent gyroscope, and the stress on each mooring cable is measured, and the mooring cable force for adjusting the inclination posture balance is obtained through the calculation terminal, and the total transmission wheel is driven to rotate, so that the vertical displacement at each position of the variable cross-section immersed pipe segment is consistent, and the sinking balance of the variable cross-section immersed pipe segment is achieved. The present invention makes intelligent adjustment to the inclination of the pipe segment.

Description

Technical Field

[0001] The invention relates to the technical field of variable-section pipe segment sinking, and in particular to a variable-section pipe segment sinking positioning system and method. Background Art

[0002] The immersed tube method is the abbreviation of the prefabricated pipe segment sinking method, which is an operation method for underwater tunnel construction. The operation sequence is to first prefabricate the immersed tube tunnel segment on the slipway, in the project or in the dry dock, seal the two ends of the segment with temporary sealing walls, then slide it into the water or release water in the dock to make it float in the water, and then tow it to the tunnel site. After positioning, load the pipe segment and make it sink into the pre-dug underwater foundation trench. The pipe segment is sunk section by section, and the adjacent pipe segments are connected by hydraulic crimping. The backfill is locked on both sides and the backfill is covered. Finally, the sealing wall is removed to connect the pipe segments to form an integral tunnel.

[0003] Immersed tube tunnels are affected by the complex underwater operating environment. In order to ensure that the pipe sections are sunk to the designed position and smoothly docked with adjacent pipe sections, it is necessary to obtain the spatial position and posture of the pipe sections to be sunk in real time during the sinking construction phase, and adopt effective measures to control stability. Compared with conventional equal-section pipe sections, variable-section pipe sections are more sensitive to water flow forces and construction loads due to the differences in longitudinal cross-sectional characteristics. Stability control during the sinking phase is difficult and the risk is relatively higher.

[0004] After literature research, it is found that the existing pipe section sinking devices have many restrictions. These devices are large in size, cost and difficult to use. At the same time, it is difficult to achieve fine control of the sinking posture, which seriously affects the convenience and controllability of pipe section sinking. In this case, the control of pipe section sinking cannot timely detect the inclination of the on-site pipe section, and the monitoring data cannot be fed back to the on-site construction personnel and devices in a timely and accurate manner. It is difficult for the device to adjust according to the real-time force and displacement conditions, and there is a great time lag.

[0005] CN 105649109 B discloses a tunnel winch-type pipe segment sinking and lowering device using a immersed tube method, comprising a winch, a winch drum partition steel plate, a steel wire rope, a fixed multi-wheel pulley, a movable multi-wheel pulley, and a fixed single-wheel pulley. The middle of the winch drum is divided into left and right sides by a steel plate. One end of the steel wire rope is fixed to one side of the winch drum, and the other end is fixed to the other side of the winch drum after passing through a fixed pulley and a movable pulley. The winch is started to recover the remaining steel wire rope, the movable multi-wheel pulley is connected to the immersed tube segment, and the winch is started again to tighten the steel wire rope to achieve a stressed state. It can be found that: this application does not solve the problem that the current sinking device is large in size and difficult to use. First, the device requires a large space to supply the winch platform, which is difficult to achieve in the restricted environment of the city. Secondly, this application cannot control the swing of the submerged tube during the sinking process, and lacks real-time monitoring and control devices. It is impossible to monitor and control the roll problem that is prone to occur in variable-section pipe sections in a timely manner. At the same time, it is difficult to ensure the stable settlement of the pipe section due to water flow disturbances, which can easily cause the sinking position of the submerged tube to deviate from the predetermined position.

[0006] CN 109056817 A discloses a water bag ballast method for immersed tube tunnel construction, comprising the following steps: S1: according to the buoyancy of the immersed tube, calculate the number and placement of water bags in the water bag ballast system; S2: arrange and install the water bag ballast system in the immersed tube; S3: store water in the water bag for leak detection; S4: when the immersed tube is floated and sunk, control and adjust the negative buoyancy and posture of the immersed tube during the lateral movement, floating and sinking installation in the dock by storing and draining water in the water bag; S5: after the installation of the immersed tube is completed, remove the water bag ballast system. It can be found that: for variable cross-section pipe sections, due to the limitation of water filling, the application cannot solve the imbalance problem of the variable cross-section pipe sections during the sinking process, cannot monitor and control the sinking posture in real time, and is difficult to maintain the sinking stability of the variable cross-section pipe sections.

[0007] CN 110206067 B discloses a device for adjusting the position of a pipe section of an immersed tunnel, including a locking frame and an adjusting frame. Through reasonable structural design, the position of the pipe section of the immersed tunnel can be accurately adjusted by control, and the device is not affected by the complex underwater working environment. The working time is short, the working efficiency is improved, and the safety of the operating personnel is ensured. It can be found that the device is difficult to adjust and control the roll problem of the variable cross-section pipe section, and it is impossible to control the uniform sinking process of the variable cross-section pipe section and the sinking rate at the same time. In addition, the device requires a large space, is difficult to install, has a high cost, and is difficult to implement.

[0008] In summary, the current pipe segment sinking device rarely acts on the variable cross-section pipe segment first, and the existing device has the problems of difficult construction, delayed real-time control effect, large volume, cost, difficulty in use, and difficulty in controlling the side wall of the variable cross-section pipe segment. Therefore, it is difficult to use it in actual engineering and achieve the desired effect. There is a lack of a sinking device specifically for variable cross-section pipe segments that is easy to control, easy to implement, occupies a small space, and has a low cost. Therefore, in order to solve the above variable cross-section pipe segment sinking control problems, a variable cross-section pipe segment sinking positioning device system and method are proposed. Summary of the invention

[0009] The purpose of the present invention is to provide a variable-section pipe segment sinking and positioning system and method, which is easy to control the sinking balance problem of the variable-section immersed pipe segment and can adjust the inclination of the pipe segment more intelligently. At the same time, the main power for sinking comes from the ballast water tank, and the main power for the mooring is the leveling force. The overall requirements are not high and the construction difficulty is small. At the same time, it can resist the force of water flow and ensure the accuracy of sinking. It is more effective in the sinking balance of the variable-section immersed pipe segment.

[0010] The present invention is achieved through the following technical solutions:

[0011] A variable cross-section pipe segment sinking and positioning system, the variable cross-section pipe segment sinking and positioning system comprising a main transmission wheel, an intelligent gyroscope, a submerged pipe segment driven wheel installed on the variable cross-section submerged pipe segment, an underwater driven wheel installed on an underwater base trench, and a mooring transmission device between the submerged pipe segment driven wheel and the underwater driven wheel; the main transmission wheel is arranged on an adjacent shore or on a ship; the intelligent gyroscope is arranged on the upper part of the variable cross-section submerged pipe segment to monitor the floating state of the variable cross-section submerged pipe segment in real time; the mooring transmission device is a separate transmission system at the driven wheel at different plane positions The system connects the mooring transmission devices at each driven wheel to the main transmission wheel to ensure that the rotation lengths of all mooring cables are consistent, and water is poured into the ballast water tank inside the variable-section immersed tube segment for sinking. During the sinking process, the intelligent gyroscope is used to measure the inclination posture of the variable-section immersed tube segment, and the stress on each mooring cable is measured. The mooring cable forces for adjusting the inclination posture to balance are obtained through the calculation terminal, and the main transmission wheel is driven to rotate, so that the vertical displacement at each position of the variable-section immersed tube segment is consistent, thereby achieving the sinking balance of the variable-section immersed tube segment.

[0012] As a further improvement of the technical solution of the present invention, the variable-section pipe segment sinking and positioning system also includes an axial force displacement monitoring device, variable-section pipe segment embedded parts, a transmission control device and temporary piers; the axial force displacement monitoring device is arranged on the total transmission wheel; the variable-section pipe segment embedded parts are arranged on the side walls of the variable-section immersed pipe segment; the transmission control device is arranged on an adjacent shore or on a ship; the transmission control device is electrically connected to the total transmission wheel, the intelligent gyroscope and the axial force displacement monitoring device, respectively; and the temporary piers are arranged on the underwater foundation trench.

[0013] As a further improvement of the technical solution of the present invention, the driven wheel of the immersed tube segment is arranged at a position where the horizontal projection position of the variable-section immersed tube segment and the underwater driven wheel in the underwater foundation trench is consistent; the driven wheel of the immersed tube segment is arranged as a multi-channel.

[0014] As a further improvement of the technical solution of the present invention, the driven wheel of the immersed tube segment is installed on the variable-section immersed tube segment by bolts.

[0015] As a further improvement of the technical solution of the present invention, when the variable-section immersed tube segment is in an inclined state, the mooring cable at the low point is in a taut posture to resist the water flow resistance, and the internal force of the mooring cable at the high point is the unbalanced moment in the inclined state / the distance from the mooring cable to the buoyancy center.

[0016] As a further improvement of the technical solution of the present invention, the underwater driven wheel is placed on the bottom of the water as a permanent structure; the underwater driven wheel is fixed on the bottom of the water by a driven wheel fixing device positioning anchor.

[0017] As a further improvement of the technical solution of the present invention, the total transmission wheel is a collection of transmission wheels connected to various cable transmission devices, and the transmission wheels are connected so that the rotation of each driven wheel remains consistent. By setting the internal cable internal force, the rotation lengths of each cable transmission device in the total transmission wheel are consistent and in a taut state.

[0018] As a further improvement of the technical solution of the present invention, the mooring transmission device sets the fixed end at the embedded part of the variable-section pipe section, then connects to the underwater driven wheel, and finally connects to the main transmission wheel.

[0019] As a further improvement of the technical solution of the present invention, a differential control device for each transmission wheel is provided at the main transmission wheel to maintain sinking stability in combination with the real-time floating state of the intelligent gyroscope.

[0020] As a further improvement of the technical solution of the present invention, a method for implementing a variable cross-section pipe segment sinking positioning system comprises the following steps:

[0021] Step S1: excavation of underwater foundation trench and setting of temporary piers;

[0022] Step S2: prefabrication and floating of variable-section immersed tube segments;

[0023] Step S3: laying of mooring transmission device;

[0024] Step S4: smart gyroscope installation;

[0025] Step S5: the main transmission wheel is arranged and connected to the underwater driven wheel and the immersed tube segment driven wheel respectively;

[0026] Step S6: Filling water into the ballast water tank inside the variable cross-section immersed tube segment to achieve weight buoyancy balance;

[0027] Step S7: Turn on the main transmission wheel to control the uniform sinking of the variable cross-section immersed tube segments and control the sinking rate;

[0028] Step S8: The variable-section immersed tube segment is lowered and the mooring transmission device is released.

[0029] Compared with the prior art, the present invention has the following technical advantages:

[0030] The present invention occupies a small space and is easy to operate. It uses the displacement balance of the mooring cable to control the uniform sinking of the variable-section immersed tube segment. At the same time, through the axial force displacement monitoring device on the total transmission wheel, each mooring cable is in a just taut posture. When there is uneven sinking, it is monitored by an intelligent gyroscope, and the mooring cable at the slower sinking position is calculated by an algorithm to obtain the balance force corresponding to the roll posture, and the overall structure is leveled. The present invention is easy to control the sinking balance problem of the variable-section immersed tube segment, and the inclination of the pipe segment is adjusted more intelligently. At the same time, the main power for sinking comes from the ballast water tank, and the mooring cable is mainly the leveling force. The overall requirements are not high, the construction difficulty is small, and it can resist the water flow force to ensure the accuracy of sinking. It is more effective in the sinking balance of the variable-section immersed tube segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of a variable-section pipe segment sinking and positioning system according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the connection structure between the main transmission wheel and the mooring transmission device according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the assembly structure of the driven wheel of the immersed tube segment and the embedded parts of the variable cross-section pipe segment according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the three-dimensional structure of a variable-cross-section immersed tube segment according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the installation structure of the underwater driven wheel according to an embodiment of the present invention;

[0036] Figure 6 It is a control method framework diagram of the transmission control device according to an embodiment of the present invention.

[0037] The numbers in the figure are:

[0038] 1-horizontal plane; 2-adjacent shore or ship; 3-transmission control device; 4-main transmission wheel; 5-variable cross-section immersed tube segment; 6-ballast water tank; 7-variable cross-section pipe segment embedded parts; 8-mooring transmission device; 9-driven wheel of immersed tube segment; 10-underwater driven wheel; 11-underwater foundation trench; 12-axial force displacement monitoring device; 13-temporary pier; 14-water bottom; 15-intelligent gyroscope; 16-driven wheel fixing device positioning anchor. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0040] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features; in addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0044] like Figures 1 to 6As shown, a variable cross-section pipe segment sinking and positioning system, the variable cross-section pipe segment sinking and positioning system comprises a total transmission wheel 4, an intelligent gyroscope 15, a submerged pipe segment driven wheel 9 installed on the variable cross-section submerged pipe segment 5, an underwater driven wheel 10 installed on the underwater base trench 11, and a mooring transmission device 8 between the submerged pipe segment driven wheel 9 and the underwater driven wheel 10; the total transmission wheel 4 is arranged on an adjacent shore or on a ship 2; the intelligent gyroscope 15 is arranged on the upper part of the variable cross-section submerged pipe segment 5 to monitor the floating state of the variable cross-section submerged pipe segment 5 in real time; the mooring transmission device 8 is a separate transmission system at the driven wheel at different plane positions, and the mooring transmission device 8 at each driven wheel is connected to the total transmission wheel 4 to ensure The rotation lengths of all mooring cables are consistent, and water is injected into the ballast water tank 6 inside the variable-section immersed tube segment 5 for sinking. During the sinking process, the inclination posture of the variable-section immersed tube segment 5 is measured by the intelligent gyroscope 15, and the stress on each mooring cable is measured. The mooring force for adjusting the inclination posture to balance is obtained through the calculation terminal. Among them, two intelligent gyroscopes 15 are arranged at the diagonals of the variable-section immersed tube segment 5, and the inclination angles of the two diagonals of the pipe section in the xy direction are measured respectively. The inclination posture of the entire immersed tube tunnel is determined by the inclination angles of the two diagonals in the xy direction; and the total transmission wheel 4 is driven to rotate, so that the vertical displacement at each position of the variable-section immersed tube segment 5 is consistent, thereby achieving the sinking balance of the variable-section immersed tube segment 5. The present invention uses the displacement balance of the mooring cable to control the uniform sinking of the variable-section immersed pipe section 5. At the same time, through the axial force displacement monitoring device on the total transmission wheel 4, each mooring cable is in a just taut posture. When there is uneven sinking, it is monitored by the intelligent gyroscope 15, and the mooring cable at the slower sinking position is calculated by the algorithm to obtain the balance force corresponding to the roll posture, so as to level the overall structure. Specifically, after the tilt posture of the pipe section is measured, the differential displacement value at each corner of the pipe section is known, and then the mooring force is applied to the highest point of the pipe section according to the differential displacement value. The magnitude of the force is determined according to the required acceleration and the distance between the point and the center of gravity, that is, the balance point of the entire pipe section changes after tilting. Then, assuming that the balance point is fixed, the difference in the bending moment from the gravity on both sides to the balance point is divided by the distance from the force value to the balance point, and the total torque from the gravity on the left and right sides of the balance point to this point is 0. If it is necessary to accelerate the process, this force can be increased, and the acceleration is the increase divided by m. It should be noted that Figure 1 In the figure, reference numeral 1 is a horizontal plane, and reference numeral 14 is a water bottom.

[0045] Specifically, in the present embodiment, the variable cross-section pipe segment sinking and positioning system further includes an axial force displacement monitoring device 12, a variable cross-section pipe segment embedded part 7, a transmission control device 3 and a temporary pier 13; the axial force displacement monitoring device 12 is arranged on the total transmission wheel 4; the variable cross-section pipe segment embedded part 7 is arranged on the side wall of the variable cross-section immersed pipe segment 5 for connecting the mooring transmission device 8; the transmission control device 3 is arranged on the adjacent shore or ship 2; the transmission control device 3 is electrically connected to the total transmission wheel 4, the intelligent gyroscope 15 and the axial force displacement monitoring device 12 respectively; the temporary pier 13 is arranged on the underwater foundation trench 11. It should be noted that the axial force displacement monitoring device 12 makes each mooring cable in a just tightened state, and the transmission control device 3 is set to effectively control the transmission rate of the total transmission wheel 4, so that the vertical displacement at each position of the variable cross-section immersed pipe segment 5 is consistent, and the sinking balance of the variable cross-section immersed pipe segment 5 is achieved.

[0046] Specifically, in this embodiment, the submerged tube segment driven wheel 9 is arranged at the position where the variable cross-section submerged tube segment 5 and the underwater driven wheel 10 are in the same horizontal projection position in the underwater foundation trench; the submerged tube segment driven wheel 9 is arranged to have multiple channels. It should be noted that the submerged tube segment driven wheel 9 and the underwater driven wheel 10 are arranged relative to each other to ensure that the mooring transmission device 8 is connected more smoothly and compactly.

[0047] Specifically, in the present embodiment, the immersed tube segment driven wheel 9 is mounted on the variable-section immersed tube segment 5 by means of bolts.

[0048] Specifically, in the present embodiment, when the variable-section immersed tube segment 5 is tilted, the mooring cable at the low point is in a taut posture to resist the water flow resistance, and the internal force of the mooring cable at the high point is the unbalanced moment in the tilted state / the distance from the mooring cable to the buoyancy center.

[0049] Specifically, in the present embodiment, the underwater driven wheel 10 is placed on the bottom of the water as a permanent structure; the underwater driven wheel 10 is fixed on the bottom of the water by a driven wheel fixing device positioning anchor 16 .

[0050] Specifically, in the present embodiment, the total transmission wheel 4 is a collection of transmission wheels connected to various mooring transmission devices, and the transmission wheels are connected so that the rotation of each driven wheel remains consistent. By setting the internal mooring internal force, the rotation lengths of each mooring transmission device in the total transmission wheel 4 are consistent and in a taut state.

[0051] Specifically, in the present embodiment, the mooring transmission device 8 has a fixed end disposed at the variable-section pipe segment embedded part 7 , then connected to the underwater driven wheel 10 , and finally connected to the total transmission wheel 4 .

[0052] Specifically, in the present embodiment, a differential control device for each transmission wheel is provided at the main transmission wheel 4 to maintain the stability of the sinking in combination with the real-time floating state of the intelligent gyroscope 15 .

[0053] Specifically, in this embodiment, a method for implementing a variable-section pipe segment sinking and positioning system includes the following steps:

[0054] Step S1: excavation of underwater foundation trench and installation of temporary buttresses 13;

[0055] Step S2: prefabrication and floating of variable-section immersed tube segments 5;

[0056] Step S3: laying of the mooring transmission device 8;

[0057] Step S4: installing the intelligent gyroscope 15;

[0058] Step S5: the main transmission wheel 4 is arranged and connected to the underwater driven wheel 10 and the immersed tube segment driven wheel 9 respectively;

[0059] Step S6: Filling water into the ballast water tank 6 inside the variable cross-section immersed tube segment 5 to achieve weight buoyancy balance;

[0060] Step S7: Turn on the main transmission wheel 4 to control the variable cross-section immersed tube segment 5 to be evenly sunk, and control the sinking rate at the same time;

[0061] Step S8: The variable-section immersed tube segment 5 is lowered and the mooring transmission device 8 is released.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] The present invention occupies a small space and is easy to operate. It uses the displacement balance of the mooring cable to control the uniform sinking of the variable-section immersed tube segment 5. At the same time, through the axial force displacement monitoring device 12 on the total transmission wheel 4, each mooring cable is in a just taut posture. When there is uneven sinking, it is monitored by the intelligent gyroscope 15, and the mooring cable at the slower sinking position is calculated by the algorithm to obtain the balance force corresponding to the roll posture, and the overall structure is leveled. The present invention is easy to control the sinking balance problem of the variable-section immersed tube segment 5, and the inclination of the pipe segment is adjusted more intelligently. At the same time, the main power for sinking comes from the ballast water tank 6, and the mooring cable is mainly the leveling force. The overall requirements are not high, the construction difficulty is small, and it can resist the water flow force to ensure the accuracy of sinking. It is more effective in the sinking balance of the variable-section immersed tube segment 5.

[0064] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A variable cross-section pipe segment sinking and positioning system, characterized in that: The variable cross-section pipe segment sinking and positioning system comprises a main transmission wheel, an intelligent gyroscope, a submerged pipe segment driven wheel installed on the variable cross-section submerged pipe segment, an underwater driven wheel installed on the underwater base trench, and a mooring transmission device between the submerged pipe segment driven wheel and the underwater driven wheel; the main transmission wheel is arranged on the adjacent shore or on the ship; the intelligent gyroscope is arranged on the upper part of the variable cross-section submerged pipe segment to monitor the floating state of the variable cross-section submerged pipe segment in real time; the mooring transmission device is a separate transmission system at the driven wheel at different plane positions, and is connected to each other by The mooring transmission device at the driven wheel is connected to the main transmission wheel to ensure that the rotation lengths of all moorings are consistent, and water is injected into the ballast water tank inside the variable-section immersed tube segment for sinking. During the sinking process, the inclination posture of the variable-section immersed tube segment is measured by the intelligent gyroscope, and the stress on each mooring cable is measured. The mooring force for adjusting the inclination posture to balance is obtained through the calculation terminal, and the main transmission wheel is driven to rotate, so that the vertical displacement at each position of the variable-section immersed tube segment is consistent, thereby achieving the sinking balance of the variable-section immersed tube segment.

2. A variable cross-section pipe segment sinking and positioning system according to claim 1, characterized in that: The variable-section pipe segment sinking and positioning system also includes an axial force displacement monitoring device, a variable-section pipe segment embedded part, a transmission control device and a temporary pier; the axial force displacement monitoring device is arranged on the main transmission wheel; the variable-section pipe segment embedded part is arranged on the side wall of the variable-section immersed pipe segment; the transmission control device is arranged on the adjacent shore or on a ship; the transmission control device is electrically connected to the main transmission wheel, the intelligent gyroscope and the axial force displacement monitoring device respectively; the temporary pier is arranged on the underwater foundation trench.

3. A variable cross-section pipe segment sinking and positioning system according to claim 1, characterized in that: The driven wheel of the immersed tube segment is arranged at a position where the horizontal projection position of the variable-section immersed tube segment and the underwater driven wheel in the underwater foundation trench is consistent; the driven wheel of the immersed tube segment is arranged to have multiple channels.

4. A variable cross-section pipe segment sinking and positioning system according to claim 3, characterized in that: The driven wheel of the immersed tube segment is installed on the immersed tube segment with variable cross-section by means of bolts.

5. A variable cross-section pipe segment sinking and positioning system according to claim 1, characterized in that: When the variable-section immersed tube segment is tilted, the mooring cable at the low point is in a taut posture to resist the water flow resistance, and the internal force of the mooring cable at the high point is the unbalanced moment in the tilted state / the distance from the mooring cable to the buoyancy center.

6. A variable cross-section pipe segment sinking and positioning system according to claim 1, characterized in that: The underwater driven wheel is placed on the bottom of the water as a permanent structure; the underwater driven wheel is fixed on the bottom of the water by a driven wheel fixing device positioning anchor.

7. A variable cross-section pipe segment sinking and positioning system according to claim 1, characterized in that: The total transmission wheel is a collection of transmission wheels connected to various mooring transmission devices. The transmission wheels are connected so that the rotation of each driven wheel remains consistent. By setting the internal mooring internal force, the rotation lengths of each mooring transmission device in the total transmission wheel are consistent and in a taut state.

8. The variable cross-section pipe segment sinking and positioning system according to claim 2, characterized in that: The mooring transmission device sets the fixed end at the embedded part of the variable-section pipe section, then connects to the underwater driven wheel, and finally connects to the main transmission wheel.

9. A variable cross-section pipe segment sinking and positioning system according to claim 1, characterized in that: The total transmission wheel is provided with a differential control device for each transmission wheel, and the real-time floating state of the intelligent gyroscope is combined to maintain the sinking stability.

10. A method for implementing a variable cross-section pipe segment sinking and positioning system, characterized in that: The following steps are involved: Step S1: excavation of underwater foundation trench and setting of temporary piers; Step S2: prefabrication and floating of variable-section immersed tube segments; Step S3: laying of mooring transmission device; Step S4: smart gyroscope installation; Step S5: the main transmission wheel is arranged and connected to the underwater driven wheel and the immersed tube segment driven wheel respectively; Step S6: Filling water into the ballast water tank inside the variable cross-section immersed tube segment to achieve weight buoyancy balance; Step S7: Turn on the main transmission wheel to control the uniform sinking of the variable cross-section immersed tube segments and control the sinking rate; Step S8: The variable-section immersed tube segment is lowered and the mooring transmission device is released.

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