Heterocentric type mother-son shield tunneling machine and construction method thereof

Abstract

The invention provides a heterocentric type mother-child shield tunneling machine and a construction method thereof, and belongs to the technical field of shield tunneling machines. Comprising mother-son cutterheads, mother-son shield bodies, a driving mechanism and a propelling mechanism, the mother-son cutter head comprises a mother machine cutter head and a son machine cutter head, and the son machine cutter head is eccentrically nested in the mother machine cutter head; the mother-son shield body comprises a mother machine shield body and a son machine shield body, and the son machine shield body is eccentrically nested in the mother machine shield body; the driving mechanism is connected with the sub-machine cutterhead through a torque beam; the propelling mechanism comprises a primary machine propelling mechanism and a secondary machine propelling mechanism, and the primary machine propelling mechanism is mounted in a primary machine shield body and provides propelling force for a primary machine cutterhead during tunneling; the sub-machine propelling mechanism is installed in the sub-machine shield body and provides propelling force for the sub-machine cutterhead in the tunneling process. According to the invention, one shield tunneling machine can be adopted to carry out tunnel construction with different diameters, and tunnels with two diameters are not concentric, so that the equipment can be used for constructing an underground platform and a tunnel at one time, station-tunnel integrated construction is realized, and the space utilization rate of the platform is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of shield machines, and relates to an eccentric type mother - son shield machine and a construction method thereof. Background Art

[0002] In existing tunnel + platform projects, the construction of the platform space is usually carried out by the manual method, and the construction of the tunnel is carried out by the shield method. However, the manual method for constructing the platform space requires open - cut excavation. When there are important structures on the ground surface (such as cultural relics, important buildings, residential buildings in clusters) and open - cut excavation is not possible, it is difficult to carry out the project construction.

[0003] In existing mother - son shield machines, the excavation of the cutter head of the sub - shield and the mother machine is generally concentric. Using one shield machine for the sequential construction of two tunnels with different diameters and concentric circles, this concentric type mother - son shield machine is not suitable for station - tunnel integrated construction, that is, it is not suitable for the integrated construction of the platform and the tunnel. The reason is that: in the same station - tunnel (including the platform and the tunnel) line, the center of the platform space is usually higher than the center of the tunnel. If a concentric type mother - son shield machine is used for the construction of the platform space and the tunnel, the excavation diameter of the cutter head of the mother machine must be increased, and then the lower part of the excavated platform space is backfilled to ensure the relative positions of the platform space and the tunnel. However, this will increase the excavation diameter of the cutter head of the mother machine, which will not only greatly increase the design, manufacturing, and construction difficulties of the shield machine, but also increase the construction cost.

[0004] In the existing double - circle combined mother - son shield patent technology, multiple cutter heads and multiple sets of drive systems are required for combination, with large implementation difficulties. Moreover, the excavation of the cutter head of the mother machine and the center of the sub - shield are on the same horizontal line, which is similar to the characteristics of a single - circle mother - son shield, and cannot improve the space utilization rate. It not only has large manufacturing and construction difficulties, but also has a high construction cost.

[0005] Therefore, the existing concentric type mother - son shield machine is not suitable for the tunnel construction of station - tunnel integration. Summary of the Invention

[0006] Aiming at the defects of the existing technology, the present invention provides an eccentric type mother - son shield machine and a construction method thereof, which can realize the integrated construction of the platform and the tunnel with one shield machine without excavating an open - cut foundation pit; the mother machine and the sub - machine of the eccentric type mother - son shield machine are arranged in an eccentric manner, which can realize the excavation of different diameters and different construction axes of the cutter head excavation of the mother machine and the sub - shield, can carry out the integrated construction of the platform and the tunnel, has good adaptability to the non - concentric center axes of the platform and the tunnel, and does not require increasing the excavation diameter of the cutter head of the mother machine and the bottom backfilling operation of the platform space, thereby improving the utilization rate of the excavation space.

[0007] The present invention provides an eccentric type mother - son shield machine, including a mother - son cutter head, a mother - son shield body, a driving mechanism, and a propulsion mechanism;

[0008] The mother - son cutter head includes a mother - machine cutter head and a son - machine cutter head. The son - machine cutter head is eccentrically nested inside the mother - machine cutter head. When tunneling with the mother - machine cutter head, the son - machine cutter head and the mother - machine cutter head excavate together. When tunneling with the son - machine cutter head, the son - machine cutter head disengages from the mother - machine cutter head and excavates independently.

[0009] The mother - son shield body includes a mother - machine shield body and a son - machine shield body. The son - machine shield body is eccentrically nested inside the mother - machine shield body. When tunneling with the mother - machine cutter head, the son - machine shield body and the mother - machine shield body together serve as a support structure. When tunneling with the son - machine cutter head, the son - machine shield body disengages from the mother - machine shield body and serves as a support structure independently.

[0010] The driving mechanism is connected to the son - machine cutter head through a torque beam.

[0011] The propulsion mechanism includes a mother - machine propulsion mechanism and a son - machine propulsion mechanism. The mother - machine propulsion mechanism is installed inside the mother - machine shield body and provides propulsion force when the mother - machine cutter head tunnels. The son - machine propulsion mechanism is installed inside the son - machine shield body and provides propulsion force when the son - machine cutter head tunnels.

[0012] Further, the son - machine cutter head and the mother - machine cutter head are connected to each other through a first connection assembly.

[0013] The first connection assembly includes a concave block, a convex block, and a first fixing block. The concave block is fixedly arranged on the mother - machine cutter head. The convex block is fixedly arranged on the son - machine cutter head. The convex block is embedded in the concave block. The first fixing block is fixedly connected to both the concave block and the convex block through connecting bolts.

[0014] Further, an installation slot hole for installing the convex block is provided at the central part of the concave block. The installation slot hole includes an integrally formed first connection part and a second connection part. The size of the first connection part is larger than that of the second connection part.

[0015] The convex block includes an integrally formed first embedding part and a second embedding part. The first embedding part is arranged to match the first connection part, and the second embedding part is arranged to match the second connection part.

[0016] When the son - machine cutter head disengages from the mother - machine cutter head, the first embedding part displaces along the direction from the first connection part to the second connection part.

[0017] Further, multiple groups of the first connection assembly are arranged in a circumferential array along the son - machine cutter head.

[0018] Further, the mother - machine shield body and the son - machine shield body are connected to each other through a second connection assembly.

[0019] The second connection component includes a third connection part provided on the shield of the mother machine, a fourth connection part provided on the shield of the son machine, and a second fixing block for connecting the third connection part and the fourth connection part.

[0020] Further, the third connection part includes a first connection section and a second connection section integrally formed, and the size of the first connection section is smaller than that of the second connection section;

[0021] The fourth connection part includes a third connection section and a fourth connection section integrally formed, the third connection section is arranged to match the first connection section, and the fourth connection section is arranged to match the second connection section;

[0022] When the shield of the son machine is separated from the shield of the mother machine, the fourth connection section is displaced along the direction from the second connection section to the first connection section.

[0023] Further, multiple groups of the second connection components are provided and arranged in a circumferential array along the shield of the son machine.

[0024] Further, the driving mechanism includes a main drive and a driving oil cylinder for driving the main drive to displace;

[0025] In the initial state, the driving oil cylinder is in the extended state, and at this time, the central axis of the main drive coincides with the central axis of the cutter head of the mother machine, and the main drive drives the cutter heads of both the mother machine and the son machine to rotate simultaneously;

[0026] When it is necessary to change the diameter and use the cutter head of the son machine for tunneling, the driving oil cylinder retracts to drive the main drive to displace along the radial direction of the cutter head of the mother machine, and the central axis of the main drive coincides with the central axis of the cutter head of the son machine, and the main drive drives the cutter head of the son machine to rotate.

[0027] The present invention also provides a construction method for an eccentric type mother-son shield machine, including the following processes:

[0028] Assemble the eccentric type mother-son shield machine as described above, and transport the eccentric type mother-son shield machine to the designated position;

[0029] When excavating and constructing the platform space, the tunneling mode of the cutter head of the mother machine is adopted; in the tunneling mode of the cutter head of the mother machine, the cutter head of the mother machine and the cutter head of the son machine are nested and installed together to form a complete mother-son cutter head, so as to transmit torque and thrust; the central axis of the main drive coincides with the central axis of the cutter head of the mother machine, drives the mother-son cutter head to rotate, the propulsion mechanism of the mother machine provides propulsion force, so that the mother-son cutter head excavates the rock and soil, and the excavated muck is discharged through the slag discharging mechanism;

[0030] When the cutter head of the mother machine excavates forward until a new ring of segment can be installed, the segment erector installs the segmented segments until the installation of the entire ring of segments is completed, forming a stable ring-shaped segment support structure; after the installation of a new ring of segments is completed, the propulsion mechanism of the mother machine uses this ring of segments as a reaction support to push the cutter head of the mother machine to excavate forward and continue the construction of the next stroke until the construction of the entire platform space is completed;

[0031] After the construction of the platform space is completed, the cutter head and shield body of the son machine are separated from the cutter head and shield body of the mother machine, and the excavation of the tunnel space is carried out in the son machine cutter head mode.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The eccentric type mother-son shield machine provided by the present invention can be used to construct tunnels with different diameters by one shield machine, and can meet the non-concentricity of tunnels with two diameters, enabling the equipment to construct the underground platform and tunnel at one time, realizing the integration of station and tunnel construction, and greatly improving the utilization rate of the platform space; at the same time, the mother-son shield machine can directly carry out diameter conversion in the tunnel without excavating a conversion foundation pit, which can not only meet the engineering requirements that cannot be excavated in an open manner (when there are important structures on the ground and other working conditions that do not allow open excavation), but also greatly reduce the construction cost.

[0034] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic 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:

[0036] Figure 1 is a schematic structural diagram of an eccentric type mother-son shield machine in an embodiment of the present invention;

[0037] Figure 2 is a schematic structural diagram of the son shield after separating from the cutter head of the mother machine and excavating in an embodiment of the present invention;

[0038] Figure 3 is Figure 1 a schematic diagram of the relative positions of the cutter head of the mother machine and the cutter head of the son machine in;

[0039] Figure 4 is Figure 1 a schematic diagram of the relative positions of the propulsion mechanism of the mother machine, the propulsion mechanism of the son machine and the drive mechanism in;

[0040] Figure 5 is Figure 1Partial enlarged schematic view at position A in [the figure];

[0041] Figure 6 is Figure 5 schematic view of another perspective state of [the figure];

[0042] Figure 7 is Figure 1 partial enlarged schematic view at position B in [the figure].

[0043] Wherein:

[0044] 1. Mother machine cutter head, 2. Sub - machine cutter head, 3. First connection component, 3.1 Concave block, 3.2 Convex block, 3.3 First fixing block, 4. Mother machine shield, 5. Sub - machine shield, 6. Second connection component, 6.1 Second fixing block, 7. Driving mechanism, 7.1 Main drive, 7.2 Driving oil cylinder, 8. Mother machine propulsion mechanism, 9. Sub - machine propulsion mechanism, 10. Slag discharge mechanism, 11. Erector, 12. Torque beam. Detailed implementation manners

[0045] To make the above - mentioned objects, features, and advantages of the present invention more clearly understandable, the following will give a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings. It should be noted that the drawings of the present invention are all in simplified forms and use non - precise scales, only for conveniently and clearly assisting in the description of the implementation of the present invention; the several mentioned in the present invention are not limited to the specific quantities in the attached drawing examples; the orientation or positional relationships indicated by 'front','middle', 'back', 'left', 'right', 'up', 'down', 'top', 'bottom','middle', etc. in the present invention are all based on the orientation or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific orientation, nor can it be understood as a limitation to the present invention.

[0046] Embodiment:

[0047] Refer to Figures 1 to 7 As shown, a non - concentric mother - son shield machine provided by the present invention includes mother - son cutter heads, mother - son shields, driving mechanism 7, propulsion mechanism, slag discharge mechanism 10, and erector 11.

[0048] The mother - son cutter heads include a mother machine cutter head 1 and a sub - machine cutter head 2. The sub - machine cutter head 2 is eccentrically nested in the mother machine cutter head 1, and the sub - machine cutter head 2 and the mother machine cutter head 1 are connected to each other through the first connection component 3; when tunneling is carried out using the mother machine cutter head 1, the sub - machine cutter head 2 and the mother machine cutter head 1 jointly excavate; when tunneling is carried out using the sub - machine cutter head 2, the sub - machine cutter head 2 detaches from the mother machine cutter head 1 and excavates alone.

[0049] The mother and child shield bodies include a mother machine shield body 4 and a child machine shield body 5. The child machine shield body 5 is eccentrically nested in the mother machine shield body 4, and the child machine shield body 5 and the mother machine shield body 4 are connected to each other through a second connection assembly 6. When tunneling with the mother machine cutter head 1, the child machine shield body 5 and the mother machine shield body 4 jointly serve as a support structure. When tunneling with the child machine cutter head 2, the child machine shield body 5 disengages from the mother machine shield and serves as a support structure alone.

[0050] The driving mechanism 7 is connected to the child machine cutter head 2 through a torque beam 12.

[0051] The propulsion mechanism includes a mother machine propulsion mechanism 8 and a child machine propulsion mechanism 9. The mother machine propulsion mechanism 8 is installed in the mother machine shield body 4 and provides propulsion force for the tunneling of the mother machine cutter head 1. The child machine propulsion mechanism 9 is installed in the child machine shield body 5 and provides propulsion force for the tunneling of the child machine cutter head 2.

[0052] The slag discharging mechanism 10 is installed in the child machine shield body 5 and is applicable to the slag discharging operation during the tunneling of both the mother machine cutter head 1 and the child machine cutter head 2.

[0053] The segment erector 11 is installed in the child shield and is used for assembling the support segments during the tunneling of both the mother machine cutter head 1 and the child machine cutter head 2. Specifically, in the tunneling mode of the mother machine cutter head 1, the installation center of the segment erector 11 is adjusted to the central axis of the tunneling of the mother machine cutter head. At this time, the suction cup of the segment erector 11 is extended through the telescopic mechanism so that the suction cup reaches the segment assembly position of the tunneling of the mother machine cutter head, which can meet the segment assembly requirements of the tunneling of the mother machine cutter head. In the tunneling mode of the child machine cutter head 2, the installation center of the segment erector 11 is adjusted to the central axis of the child shield. At this time, the system of the segment erector 11 is retracted through the telescopic mechanism so that the suction cup is in the segment assembly position of the child shield, which can meet the segment assembly requirements of the child shield.

[0054] Preferably, multiple groups of the first connection assemblies 3 are arranged in a circumferential array along the child machine cutter head 2. A single group of the first connection assembly 3 includes a concave block 3.1, a convex block 3.2, and a first fixing block 3.3. The concave block 3.1 is fixedly arranged on the mother machine cutter head 1, the convex block 3.2 is fixedly arranged on the child machine cutter head 2, the convex block 3.2 is embedded in the concave block 3.1, and the first fixing block 3.3 is fixedly connected to both the concave block 3.1 and the convex block 3.2 through a connecting bolt.

[0055] Further preferably, an installation slot for installing the convex block 3.2 is arranged at the central part of the concave block 3.1. The installation slot includes an integrally formed first connection part and a second connection part, and the size of the first connection part is larger than that of the second connection part.

[0056] The convex block 3.2 includes an integrally formed first embedding part and a second embedding part. The first embedding part is arranged to match the first connection part, and the second embedding part is arranged to match the second connection part.

[0057] When the sub - machine cutter head 2 disengages from the main - machine cutter head 1, the first embedding part displaces in the direction from the first connecting part to the second connecting part.

[0058] Preferably, multiple groups of the second connecting components 6 are arranged in a circumferential array along the sub - machine shield 5. A single - group second connecting component 6 includes a third connecting part arranged on the main - machine shield 4, a fourth connecting part arranged on the sub - machine shield 5, and a second fixing block 6.1 for connecting the third connecting part and the fourth connecting part.

[0059] Further preferably, the third connecting part includes a first connecting section and a second connecting section integrally formed, and the size of the first connecting section is smaller than that of the second connecting section;

[0060] The fourth connecting part includes a third connecting section and a fourth connecting section integrally formed. The third connecting section is arranged to match the first connecting section, and the fourth connecting section is arranged to match the second connecting section;

[0061] When the sub - machine shield 5 disengages from the main - machine shield 4, the fourth connecting section displaces in the direction from the second connecting section to the first connecting section.

[0062] Preferably, the driving mechanism 7 includes a main drive 7.1 and a driving oil cylinder 7.2 for driving the main drive 7.1 to displace; in the initial state, the driving oil cylinder 7.2 is in the extended state, and at this time, the central axis of the main drive 7.1 coincides with the central axis of the main - machine cutter head 1, and the main drive 7.1 drives both the main - machine cutter head 1 and the sub - machine cutter head 2 to rotate; when it is necessary to change the diameter and use the sub - machine cutter head 2 for tunneling, the driving oil cylinder 7.2 retracts to drive the main drive 7.1 to displace in the radial direction of the main - machine cutter head 1, so that the central axis of the main drive 7.1 coincides with the central axis of the sub - machine cutter head 2, and the main drive 7.1 drives the sub - machine cutter head 2 to rotate.

[0063] As a further embodiment of the present invention, except for the above - mentioned structure, the other structures and connection relationships of the eccentric type main - sub shield machine refer to the prior art.

[0064] As a further embodiment of the present invention, the present invention also provides a method for tunneling using the above - mentioned eccentric type main - sub shield machine, and its specific method is as follows:

[0065] When excavating and constructing the platform space, the main - machine cutter head tunneling mode is adopted; in the main - machine cutter head tunneling mode, the main - machine cutter head and the sub - machine cutter head are nested and installed together to form a complete main - sub cutter head, so as to transmit torque and thrust; the central axis of the main drive coincides with the central axis of the main - machine cutter head, driving the main - sub cutter head to rotate, and the main - machine propulsion mechanism provides propulsion force to make the main - sub cutter head excavate the rock and soil, and the excavated muck is discharged through the slag - discharging mechanism;

[0066] When the cutter head of the mother machine excavates forward until a new ring of segment can be installed, the segment erector installs the segmented segments until the entire ring of segments is assembled to form a stable ring-shaped segment support structure; after a new ring of segments is assembled, the propulsion mechanism of the mother machine uses this ring of segments as a reaction support to push the cutter head of the mother machine to excavate forward and continue the construction of the next stroke until the entire platform space is constructed.

[0067] When the construction of the platform space is completed, the cutter head and shield of the son machine are separated from the cutter head and shield of the mother machine, and the tunnel space is excavated in the son machine cutter head mode; among them, the process of the cutter head and shield of the son machine separating from the cutter head and shield of the mother machine is as follows: the driving oil cylinder drives the main drive to displace in its radial direction so that the central axis of the main drive coincides with the central axis of the cutter head of the son machine; at the same time, the cutter head of the son machine is separated from the cutter head of the mother machine, the shield of the son machine is separated from the shield of the mother machine, and the segment erector adjusts its installation position.

[0068] Furthermore, the driving mechanism has two working positions, which are respectively:

[0069] Drive position 1: The working position of the driving mechanism in the mother machine cutter head excavation mode, at this time the central axis of the main drive coincides with the central axis of the cutter head of the mother machine;

[0070] Drive position 2: The working position of the driving mechanism in the son machine cutter head excavation mode, at this time the central axis of the main drive is adjusted to coincide with the central axis of the cutter head of the son machine.

[0071] Furthermore, the segment erector has two installation positions, which are respectively:

[0072] Assembly position 1: The center of the segment erector is at the installation position in the mother machine cutter head excavation mode. At this time, to meet the stroke requirement of segment assembly during the excavation of the mother machine cutter head, the segment erector suction cup is extended through the telescopic device;

[0073] Assembly position 2: The center of the segment erector is at the installation position in the son machine cutter head excavation mode. At this time, the segment erector suction cup needs to be retracted through the telescopic device to meet the stroke requirement of segment assembly in the son machine cutter head excavation mode.

[0074] Furthermore, the specific process of switching from excavating with the mother machine cutter head to excavating with the son machine cutter head is as follows:

[0075] ①. Rotate the mother and son cutter heads to the zero position (as Figure 3 shown), at this time the central axis of the cutter head of the son machine is directly below the central axis of the cutter head of the mother machine;

[0076] ②. Remove the connecting bolts between the torque beam and the mother and son cutter heads, switch the working position of the driving mechanism from drive position 1 to drive position 2, and install the connecting bolts between the torque beam and the cutter head of the son machine;

[0077] ③. Remove the connecting bolts between the cutter head of the slave machine and the cutter head of the master machine. At this time, the cutter head of the slave machine can slide forward relative to the cutter head of the master machine, so as to realize the separation of the cutter head of the slave machine and the cutter head of the master machine. The connection method of the wedge + bolt between the cutter head of the slave machine and the cutter head of the master machine is as Figure 5 and Figure 6 shown, which can not only transmit torque and thrust, but also realize convenient separation;

[0078] ④. Remove the connecting bolts between the shield body of the slave machine and the shield body of the master machine. At this time, the shield body of the slave machine can slide forward relative to the shield body of the master machine, so as to realize the separation of the shield body of the slave machine and the shield body of the master machine. The cooperation and connection method between the shield body of the slave machine and the shield body of the master machine is shown in Figure 7 shown, which can not only prevent the relative rotation between the shield body of the slave machine and the shield body of the master machine, but also transmit thrust;

[0079] ⑤. Adjust the erector from position 1 to position 2, and at the same time adjust the erector suction cup to assemble the segment of the sub shield through the telescopic device;

[0080] ⑥. Push the sub shield forward, so as to realize the separation of the sub shield and the tunneling of the cutter head of the master machine, and carry out the excavation construction of the tunnel space.

[0081] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An eccentric mother-child shield machine, characterized in that: It comprises a mother and child cutter disc, a mother and child shield, a driving mechanism (7) and a propulsion mechanism; The mother-child cutterhead comprises a mother cutterhead (1) and a child cutterhead (2), wherein the child cutterhead (2) is eccentrically nested in the mother cutterhead (1); when the mother cutterhead (1) is used for excavation, the child cutterhead (2) and the mother cutterhead (1) excavate together; when the child cutterhead (2) is used for excavation, the child cutterhead (2) is separated from the mother cutterhead (1) and excavates independently; The mother-child shield body comprises a mother machine shield body (4) and a child machine shield body (5), wherein the child machine shield body (5) is eccentrically nested in the mother machine shield body (4); when the mother machine cutterhead (1) is used for excavation, the child machine shield body (5) and the mother machine shield body (4) serve together as a support structure; when the child machine cutterhead (2) is used for excavation, the child machine shield body (5) is separated from the mother machine shield body and serves as a support structure alone; The driving mechanism (7) is connected to the sub-machine cutter disc (2) via a torque beam (12); The propulsion mechanism comprises a mother machine propulsion mechanism (8) and a sub-machine propulsion mechanism (9); the mother machine propulsion mechanism (8) is installed in a mother machine shield (4) to provide propulsion force for the mother machine cutter head (1) when excavating; the sub-machine propulsion mechanism (9) is installed in a sub-machine shield (5) to provide propulsion force for the sub-machine cutter head (2) when excavating.

2. The eccentric mother-child shield machine according to claim 1, characterized in that: The slave machine cutter disc (2) and the master machine cutter disc (1) are connected to each other via a first connecting component (3); The first connecting assembly (3) comprises a concave block (3.1), a convex block (3.2) and a first fixing block (3.3); the concave block (3.1) is fixedly arranged on the master machine cutter disc (1); the convex block (3.2) is fixedly arranged on the slave machine cutter disc (2); the convex block (3.2) is embedded in the concave block (3.1); and the first fixing block (3.3) is fixedly connected to the concave block (3.1) and the convex block (3.2) at the same time by connecting bolts.

3. The eccentric mother-child shield machine according to claim 2 is characterized in that: A mounting slot hole for mounting the convex block (3.2) is provided at the center of the concave block (3.1), the mounting slot hole comprising an integrally formed first connecting portion and a second connecting portion, the size of the first connecting portion being larger than the size of the second connecting portion; The convex block (3.2) comprises an integrally formed first embedded portion and a second embedded portion, the first embedded portion and the first connecting portion are arranged to match each other, and the second embedded portion and the second connecting portion are arranged to match each other; When the slave machine cutter disc (2) is detached from the master machine cutter disc (1), the first embedded portion is displaced in a direction from the first connecting portion to the second connecting portion.

4. The eccentric mother-child shield machine according to claim 3 is characterized in that: The first connection assembly (3) is provided with a plurality of groups arranged in an array along the circumference of the sub-machine cutter disc (2).

5. The eccentric mother-child shield machine according to claim 1, characterized in that: The main machine shield body (4) and the sub-machine shield body (5) are connected to each other via a second connecting component (6); The second connection assembly (6) comprises a third connection portion provided on the mother machine shield (4), a fourth connection portion provided on the daughter machine shield (5), and a second fixing block (6.1) for connecting the third connection portion and the fourth connection portion.

6. The eccentric mother-child shield machine according to claim 5, characterized in that: The third connecting portion includes a first connecting section and a second connecting section formed in one piece, wherein the size of the first connecting section is smaller than the size of the second connecting section; The fourth connecting portion includes an integrally formed third connecting section and a fourth connecting section, the third connecting section is matched with the first connecting section, and the fourth connecting section is matched with the second connecting section; When the slave machine shield body (5) is separated from the master machine shield body (4), the fourth connecting section is displaced in the direction from the second connecting section to the first connecting section.

7. The eccentric mother-child shield machine according to claim 6, characterized in that: The second connection components (6) are provided in a plurality of groups arranged in an array along the circumference of the sub-machine shield body (5).

8. The eccentric mother-child shield machine according to any one of claims 1 to 7, characterized in that: The driving mechanism (7) comprises a main drive (7.1) and a driving cylinder (7.2) for driving the main drive (7.1) to move; In the initial state, the driving cylinder (7.2) is in an extended state, and at this time, the central axis of the main drive (7.1) coincides with the central axis of the mother machine cutter disc (1), and the main drive (7.1) drives the mother machine cutter disc (1) and the slave machine cutter disc (2) to rotate at the same time; When the diameter needs to be changed to the slave machine cutter disc (2) for excavation, the driving cylinder (7.2) is retracted to drive the main drive (7.1) to move along the radial direction of the master machine cutter disc (1), the central axis of the main drive (7.1) coincides with the central axis of the slave machine cutter disc (2), and the main drive (7.1) drives the slave machine cutter disc (2) to rotate.

9. A construction method of an eccentric mother-child shield machine, characterized in that: The process includes: Assembling the eccentric mother-child shield machine as claimed in claim 8, and transporting the eccentric mother-child shield machine to a designated location; When excavating the platform space, the mother machine cutterhead excavation mode is adopted; in the mother machine cutterhead excavation mode, the mother machine cutterhead and the sub-machine cutterhead are nested together to form a complete mother-sub cutterhead, thereby transmitting torque and thrust; the central axis of the main drive coincides with the central axis of the mother machine cutterhead, driving the mother-sub cutterhead to rotate, and the mother machine propulsion mechanism provides propulsion force, so that the mother-sub cutterhead excavates rock and soil, and the excavated slag is discharged through the slag discharge mechanism; When the cutter head of the mother machine excavates forward to the point where a new ring of segments can be installed, the assembler will install the segments until a whole ring of segments is assembled to form a stable ring-mounted segment support structure; when a new ring of segments is assembled, the mother machine propulsion mechanism uses the ring of segments as a reaction force support to push the cutter head of the mother machine forward to excavate and continue the construction of the next trip until the entire platform space is completed; When the platform space construction is completed, the cutter disc and shield of the slave machine are separated from the cutter disc and shield of the mother machine, and the cutter disc mode of the slave machine is used to excavate the tunnel space.

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