Construction method for local replacement of shield forming tunnel invasion limit duct piece

Abstract

The invention discloses a construction method for local replacement of a shield forming tunnel invasion and limit duct piece. The invasion and limit duct piece is replaced in a shield tunnel through replacement equipment. The replacement equipment comprises a sealing structure, a circulation structure, a supporting structure, a duct piece breaking structure, a duct piece replacement structure and a man gate. The sealing structure is used for forming a closed space in the tunnel structure, the tunnel inner support is formed through grouting, the tunnel structure is supported through slurry balance, the stratum can be stabilized without arranging an external support, and the problems existing in existing stratum reinforcement are solved; and the new duct piece is installed through the duct piece replacement structure, so that the replacement operation of the invasion limit duct piece is effectively simplified, the construction period is greatly shortened, and meanwhile, the construction cost is also effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, and in particular to a construction method for partially replacing an intrusion limiting segment of a shield-formed tunnel. Background Art

[0002] The shield method refers to a method of constructing underground space by using the cutterhead and tools at the front end of the shield machine to excavate rock and soil, assembling prefabricated segments under the protection of the shield shell and providing reaction force for the propulsion hydraulic cylinder, and advancing in a serpentine manner in the stratum.

[0003] With the improvement of urban underground space excavation efficiency, shield tunnel construction is faced with more complex and comprehensive conditions such as large burial depth, small radius, large longitudinal slope, and complex geology, affected by surface and underground structures. During construction, it is inevitable that there will be construction problems such as serious misalignment and bulging of tunnel segments, damage and water and mud gushing, and large overall deformation, which will seriously affect tunnel safety.

[0004] At present, the method for partial replacement of the intrusion limit segments in the shield-type tunnel mainly adopts the measures of combining outer stratum reinforcement with inner support to ensure the tunnel structure and construction safety, and then partially replace the intrusion limit segments. However, the above method has the problems of long stratum reinforcement time, complex support conversion process, high safety risk, and greatly increases the construction period and construction cost. The present invention provides a construction method for partial replacement of the intrusion limit segments in the shield-type tunnel to solve the above problems. Summary of the invention

[0005] The present invention provides a construction method for partially replacing the intrusion limit segments of a shield-type tunnel, which uses an inner grouting support method to ensure the stability and safety of the tunnel structure and to conveniently and quickly replace the intrusion limit segments.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A construction method for partial replacement of an intruding segment of a shield-formed tunnel, wherein the intruding segment is replaced by replacing equipment in the shield tunnel; the replacing equipment comprises a sealing structure, a circulation structure, a supporting structure, a segment breaking structure, a segment replacement structure and a man-gate; the sealing structure is arranged in the shield tunnel and is used to seal the segment replacement section of the tunnel and support the tunnel; the circulation structure and the man-gate are arranged on the sealing structure; the supporting structure comprises a supporting frame and an actuating rod; the supporting frame is arranged on the sealing structure; the actuating rod is movably arranged on the supporting frame; the actuating rod is passed through the axis of the sealing structure and moves forward and backward along the axis; the segment breaking structure and the segment replacement structure are arranged on the actuating rod and are located in the sealing structure; The construction method for partial replacement of the limited segment includes the following steps: S1, component prefabrication: prefabricate components according to design drawings and transport the prefabricated components to the construction site; S2, equipment assembly: place the new segments at the limit segment in advance, then lower the prefabricated components into the well and transport them to the limit segment for assembly; S3, grouting support: grouting the inner cavity of the sealing structure through the circulation structure, and supporting the shield tunnel by filling the inner part of the sealing structure with grout; S4, segment replacement: Use the man-gate to send the diver into the sealing structure to remove the connecting bolt of the intruding segment. Then the diver exits the sealing structure and controls the segment breaking structure to remove the intruding segment. Then the segment replacement structure is controlled to install the new segment to achieve the segment replacement. S5, segment fixing: Use the man-gate to send the diver into the sealing structure, lock the connection bolt of the new segment, and then the diver exits the sealing structure and discharges the mud inside the sealing structure through the circulation structure; S6, dismantling equipment: dismantle the equipment and transport it to the working pit, and then lift it out of the ground through the working pit.

[0007] Furthermore, in step S4, when replacing the pipe segment, the action rod is controlled to move forward and backward and rotate, so that the pipe segment breaking structure is aligned with the intruding pipe segment, the intruding pipe segment is crushed and removed, and then the action rod is controlled to move forward and backward and rotate, so that the pipe segment replacement structure installs the new pipe segment at the removal position.

[0008] Furthermore, the sealing structure includes a front sealing component and a rear sealing component, which are arranged relative to each other in the tunnel and block and seal the tunnel section therebetween. The front sealing component and the rear sealing component both include a sealing baffle and a sealing ring plate, the sealing baffle is arranged perpendicular to the tunnel axis, and the sealing ring plate is arranged perpendicularly on the edge of the sealing baffle.

[0009] Furthermore, the circulation structure includes an upper circulation slurry pipe and a lower circulation slurry pipe, wherein the upper circulation slurry pipe is arranged at the upper part of the sealing baffle of the front sealing assembly, and the lower circulation slurry pipe is arranged at the lower part of the sealing baffle of the front sealing assembly.

[0010] Further, the support frame includes a front support frame and a rear support frame, the front support frame is arranged on the front sealing assembly, and the rear support frame is arranged on the rear sealing assembly, the front support frame and the rear support frame both include a first support leg, a second support leg, a third support leg and a support seat, the upper ends of the first support leg, the second support leg and the third support leg are all connected to the support seat, the lower ends of the first support leg, the second support leg and the third support leg are arranged on the sealing ring plate, the support seat is arranged on the sealing baffle, and the action rod is connected to the support seat of the front support frame and the support seat of the rear support frame.

[0011] Furthermore, the segment breaking structure comprises a first action arm and a crushing head, wherein the first action arm is arranged on the action rod, and the crushing head is movably arranged at the outer end of the first action arm.

[0012] Furthermore, the segment replacement structure includes a second action arm, a telescopic arm and a suction cup, the second action arm is arranged on the action rod, the telescopic arm is movably arranged at the outer end of the second action arm, and the suction cup is movably arranged at the outer end of the telescopic arm.

[0013] Furthermore, the mangate comprises a mangate compartment, a first gate and a second gate. The mangate compartment is arranged on a sealing baffle of a front sealing assembly, the first gate is arranged on a front end surface of the mangate compartment, and the second gate is arranged on a rear end surface of the mangate compartment.

[0014] Furthermore, a grouting port and a man-gate passage are provided on the sealing baffle of the front sealing assembly.

[0015] Furthermore, a sealing gasket is provided on the sealing ring plate, and the sealing gasket is arranged on the outer side of the sealing ring plate.

[0016] The beneficial effects of the present invention are as follows: The sealing structure is used to form a closed space in the tunnel structure, and the tunnel support is formed by grouting. The tunnel structure is supported by mud-water balance. The ground can be stabilized without the need for external support. This solves the existing ground reinforcement problems, effectively simplifies the replacement operation of the intrusion limit segment, greatly reduces the construction period, and also effectively reduces the construction cost. The segment crushing structure and the segment replacement structure are used to realize the automatic replacement of the intrusion segment. The construction efficiency is high and the construction operation is simple. The segment replacement can be realized quickly and the safety risk during construction is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the construction state of the present invention; Figure 2 It is a front view schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the structure of the front sealing assembly of the present invention; Figure 4 It is a schematic diagram of the setting state of the front support frame of the present invention; Figure 5 It is a schematic diagram of the setting state of the pipe segment breaking structure of the present invention; Figure 6 It is a schematic diagram of the setting state of the pipe segment replacement structure of the present invention; Figure 7 It is a schematic diagram of the structure of the human lock of the present invention.

[0018] Figure numerals: 1. sealing structure; 11. sealing baffle; 12. sealing ring plate; 13. sealing gasket; 2. circulation structure; 21. upper circulating slurry pipe; 22. lower circulating slurry pipe; 3. supporting structure; 31. supporting frame; 311. supporting seat; 32. actuating rod; 4. segment breaking structure; 41. first actuating arm; 42. crushing head; 5. segment replacement structure; 51. second actuating arm; 52. telescopic arm; 53. suction cup; 6. mangate; 61. mangate compartment; 62. first gate; 63. second gate. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figure 1 , 2As shown, a construction method for partial replacement of the intrusion limit segment of a shield-formed tunnel is used to replace the intrusion limit segment in the shield tunnel by replacing equipment; the replacement equipment includes a sealing structure 1, a circulation structure 2, a support structure 3, a segment breaking structure 4, a segment replacement structure 5 and a man gate 6, the sealing structure 1 is arranged in the shield tunnel, in contact with the inner wall of the tunnel structure, and is arranged on both sides of the segment replacement section of the tunnel, and is used to seal the segment replacement section of the tunnel and support the corresponding tunnel structure at the same time, the circulation structure 2 and the man gate 6 are arranged on the sealing structure 1, the circulation structure 2 is used for grouting and discharging grout into the sealing structure 1, and the man gate 6 is used for personnel to enter and exit, and the support structure 3 is used as a mounting structure, including a support frame 31 and an action rod 3 2. The support frame 31 is arranged on the sealing structure 1, and is used to support the action rod 32. The action rod 32 is movably arranged on the support frame 31. The action rod 32 is passed through the axis of the sealing structure 1, and moves along the front and rear directions of the axis during the construction process, thereby driving the pipe segment breaking structure 4 and the pipe segment replacement structure 5 to move synchronously. The action rod 32 serves as the installation basis of the pipe segment breaking structure 4 and the pipe segment replacement structure 5, and drives the pipe segment breaking structure 4 and the pipe segment replacement structure 5 to rotate and move. The pipe segment breaking structure 4 and the pipe segment replacement structure 5 are arranged on the action rod 32 and are located in the sealing structure 1. The pipe segment breaking structure 4 is used to break and clean the intruded pipe segment, and the pipe segment replacement structure 5 is used to install the new pipe segment at the corresponding position.

[0022] like Figure 1As shown, the construction principle of the present invention is as follows: the sealing structure 1 is set in the tunnel section with the intrusion limit segment. The installed sealing structure 1 blocks and seals the two ends of the corresponding stage of the tunnel. Then, the circulation structure 2 set on the sealing structure 1 is used to inject grout into the sealing structure 1 to achieve mud-water balance, thereby achieving support for the corresponding tunnel section. No external support is required to ensure the stability of the stratum. After the grouting is completed and the mud-water balance is achieved, personnel need to enter the sealing structure 1 to remove the fastening bolts of the intrusion limit segment. The bolt removal process requires divers to enter and exit the sealing structure 1 through the manlock 6, which will not destroy the mud-water balance in the sealing structure 1. Then, the action rod 32 is controlled to move, and the segment breaking structure 4 is first driven to align with the intruding segment through translation and rotation. After the intruding segment is broken and cleaned by the segment breaking structure 4, the segment replacement structure 5 is driven to align with the placed new segment through translation and rotation and absorb and grab it. Then, the segment replacement structure 5 and the new segment are driven to move to the removal position through translation and rotation and install. After the new segment is installed, the diver enters the sealing structure 1 through the man gate 6 and locks the connecting bolt of the new segment. Then, the diver exits the sealing structure 1 and uses the circulation structure 2 to discharge the slurry in the sealing structure 1, and then the equipment is removed. The above construction process only needs to use the sealing structure 1 to form a mud-water balance to complete the support of the tunnel structure. Compared with the support method of the external support and the internal support, the construction process of the present invention has the advantages of convenient operation and fewer construction processes, which can greatly improve the construction efficiency and reduce costs.

[0023] like Figure 1 , 2 As shown in Figure 3, further, the sealing structure 1 includes a front sealing component and a rear sealing component, and the front sealing component and the rear sealing component are relatively arranged in the tunnel. After installation, the front sealing component and the rear sealing component are perpendicular to the tunnel axis, and their outer ends are in contact with the inner wall of the tunnel. After installation, the front sealing component and the rear sealing component block and seal the tunnel section between the two, and form a closed inner cavity together with the tunnel structure. The front sealing component and the rear sealing component both include a sealing baffle 11 and a sealing ring plate 12, and the sealing baffle 11 is arranged perpendicular to the tunnel axis. The sealing ring plate 12 is vertically arranged at the edge of the sealing baffle 11 and in contact with the inner wall of the tunnel. A sealing gasket 13 is provided on the sealing ring plate 12, and the sealing gasket 13 is arranged on the outer side of the sealing ring plate 12. After the sealing ring plate 12 is installed, the sealing gasket 13 on the outer side thereof is squeezed to achieve sealing between the sealing ring plate 12 and the inner wall of the tunnel, thereby ensuring the sealing between the front sealing component and the rear sealing component.

[0024] Furthermore, the front sealing assembly and the rear sealing assembly are both composed of unit blocks, each of which is composed of a sector-shaped sealing baffle 11 and a corresponding arc-segment sealing ring plate 12. The front sealing assembly and the rear sealing assembly can be formed by assembling the unit blocks. The support frame 31 is set on one of the unit blocks. During installation, the unit block with the support frame 31 is set at the bottom to ensure structural stability.

[0025] like Figure 1 , 2 As shown, further, the circulation structure 2 includes an upper circulation slurry pipe 21 and a lower circulation slurry pipe 22, wherein the upper circulation slurry pipe 21 is arranged at the upper part of the sealing baffle 11 of the front sealing assembly, and the lower circulation slurry pipe 22 is arranged at the lower part of the sealing baffle 11 of the front sealing assembly, and the sealing baffle 11 is provided with a corresponding grouting port, and the upper circulation slurry pipe 21 and the lower circulation slurry pipe 22 are both connected to the grouting port. When grouting is performed, grouting is performed through the lower circulation slurry pipe 22, and when slurry flows out of the upper circulation slurry pipe 21, grouting has been completed in the sealing structure 1; when slurry is discharged, slurry is discharged through the lower circulation slurry pipe 22.

[0026] like Figure 1 , 2 As shown in , 4, further, the support frame 31 includes a front support frame and a rear support frame, the front support frame is arranged on the front sealing assembly, and the rear support frame is arranged on the rear sealing assembly, the front support frame and the rear support frame both include a first support leg, a second support leg, a third support leg and a support seat 311, the upper ends of the first support leg, the second support leg and the third support leg are all connected to the support seat 311, and are arranged at radial intervals along the support seat 311, the lower ends of the first support leg, the second support leg and the third support leg are arranged on the sealing ring plate 12, and the support seat 311 is arranged on the sealing baffle 11, the action rod 32 is connected to the support seat 311 of the front support frame and the support seat 311 of the rear support frame, the action rod 32 is mounted between the front and rear support seats 311, and can move forward and backward along the axial direction and rotate around the axis on the front and rear support seats 311.

[0027] like Figure 1 , 5 As shown, further, the segment breaking structure 4 includes a first action arm 41 and a crushing head 42. The first action arm 41 is fixedly arranged on the action rod 32 and moves synchronously with the action rod 32. The crushing head 42 is movably arranged at the outer end of the first action arm 41. The crushing head 42 performs telescopic movement along the axis of the first action arm 41 for crushing and cleaning the intruding segments.

[0028] like Figure 1 , 6As shown, further, the segment replacement structure 5 includes a second action arm 51, a telescopic arm 52 and a suction cup 53. The second action arm 51 is fixedly arranged on the action rod 32 and moves synchronously with the action rod 32. The telescopic arm 52 is movably arranged at the outer end of the second action arm 51. The telescopic arm 52 is telescopic along the axis of the second action arm 51 and can rotate around the axis. The suction cup 53 is movably arranged at the outer end of the telescopic arm 52 to grasp the new segment by adsorption.

[0029] like Figure 1 , 7 As shown, further, the manlock 6 includes a manlock chamber 61, a first gate 62 and a second gate 63. The manlock chamber 61 is fixed on the sealing baffle 11 of the front sealing assembly. The first gate 62 is arranged on the front end surface of the manlock chamber 61 for divers to enter the manlock chamber 61. The second gate 63 is arranged on the rear end surface of the manlock chamber 61 for divers to enter the sealing structure 1 from the manlock chamber 61. A manlock passage is provided on the sealing baffle 11 of the front sealing assembly, and the manlock passage is blocked by the second gate 63.

[0030] like Figure 1 As shown, a construction method for partial replacement of a shield-type tunnel limited-intrusion segment comprises the following steps: S1, component prefabrication: prefabricate components according to design drawings and transport the prefabricated components to the construction site; S2, equipment assembly: place the new segments at the limit segment in advance, then lower the prefabricated components into the well and transport them to the limit segment for assembly; During assembly, the unit blocks of the front sealing assembly and the rear sealing assembly are first transferred to the installation position, and then the action rod 32 is first inserted into the support frame 31 of the unit block provided with the support frame 31, and then the above unit blocks are supported to keep them stable, and then the unit blocks are assembled and connected one by one to form a complete front sealing assembly and rear sealing assembly, thereby forming a sealing structure 1 and sealing and supporting the tunnel; S3, grouting support: grouting is performed into the inner cavity of the sealing structure 1 through the circulation structure 2, and the shield tunnel is supported by filling the inner part of the sealing structure 1 with grout; S4, replacement of pipe segments: the diver is sent into the sealing structure 1 by the man-gate 6 to remove the connecting bolt of the intruding pipe segment, and then the diver exits the sealing structure 1, controls the pipe segment breaking structure 4 to remove the intruding pipe segment, and then controls the pipe segment replacement structure 5 to install the new pipe segment, thus replacing the pipe segment; S5, segment fixing: Use the man-gate 6 to send the diver into the sealing structure 1, lock the connection bolt of the new segment, and then the diver exits the sealing structure 1 and discharges the mud inside the sealing structure 1 through the circulation structure 2; S6, dismantling equipment: dismantle the equipment and transport it to the working pit, and then lift it out of the ground through the working pit.

[0031] Furthermore, in step S4, when replacing the pipe segment, the action rod 32 is controlled to move forward and backward and rotate, so that the pipe segment breaking structure 4 is aimed at the intruding pipe segment, and the intruding pipe segment is crushed and removed, and then the action rod 32 is controlled to move forward and backward and rotate, so that the pipe segment replacement structure 5 installs the new pipe segment at the removal position.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

Claims

1. A construction method for partial replacement of limited-intrusion segments in a shield-type tunnel, characterized in that: In a shield tunnel, an intruding pipe segment is replaced by replacing equipment; the replacement equipment comprises a sealing structure (1), a circulation structure (2), a support structure (3), a pipe segment breaking structure (4), a pipe segment replacement structure (5) and a man-gate (6); the sealing structure (1) is arranged in the shield tunnel and is used to seal the pipe segment replacement section of the tunnel and support the tunnel; the circulation structure (2) and the man-gate (6) are arranged on the sealing structure (1); the supporting structure (3) comprises a support frame (31) and an actuating rod (32); the support frame (31) is arranged on the sealing structure (1); the actuating rod (32) is movably arranged on the support frame (31); the actuating rod (32) is passed through the axis of the sealing structure (1) and moves forward and backward along the axis; the pipe segment breaking structure (4) and the pipe segment replacement structure (5) are arranged on the actuating rod (32) and are located in the sealing structure (1); The construction method for partial replacement of the limited segment includes the following steps: S1, component prefabrication: prefabricate components according to design drawings and transport the prefabricated components to the construction site; S2, equipment assembly: place the new segments at the limit segment in advance, then lower the prefabricated components into the well and transport them to the limit segment for assembly; S3, grouting support: grouting the inner cavity of the sealing structure (1) through the annular structure (2), and supporting the shield tunnel by filling the inner part of the sealing structure (1) with grout; S4, pipe segment replacement: the diver is sent into the sealing structure (1) by using the man-operated lock (6) to remove the connecting bolt of the intruding pipe segment. The diver then exits the sealing structure (1) and controls the pipe segment breaking structure (4) to remove the intruding pipe segment. The pipe segment replacement structure (5) is then controlled to install a new pipe segment, thereby replacing the pipe segment. S5, fixing the pipe segment: using the man-gate (6) to send the diver into the sealing structure (1), to lock the connection bolt of the new pipe segment, and then the diver exits the sealing structure (1) to discharge the mud inside the sealing structure (1) through the circulation structure (2); S6, dismantling equipment: dismantle the equipment and transport it to the working pit, and then lift it out of the ground through the working pit.

2. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 1 is characterized by: In step S4, when replacing the pipe segment, the action rod (32) is controlled to move forward and backward and rotate, so that the pipe segment breaking structure (4) is aligned with the intruding pipe segment, and the intruding pipe segment is broken and removed. Then, the action rod (32) is controlled to move forward and backward and rotate, so that the pipe segment replacement structure (5) installs the new pipe segment at the removal position.

3. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 1 is characterized by: The sealing structure (1) comprises a front sealing component and a rear sealing component, the front sealing component and the rear sealing component are arranged relative to each other in a tunnel and block and seal the tunnel section therebetween, the front sealing component and the rear sealing component both comprise a sealing baffle (11) and a sealing ring plate (12), the sealing baffle (11) is arranged perpendicular to the tunnel axis, and the sealing ring plate (12) is arranged perpendicularly on the edge of the sealing baffle (11).

4. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 3 is characterized by: The circulation structure (2) comprises an upper circulation slurry pipe (21) and a lower circulation slurry pipe (22), wherein the upper circulation slurry pipe (21) is arranged at the upper part of the sealing baffle (11) of the front sealing assembly, and the lower circulation slurry pipe (22) is arranged at the lower part of the sealing baffle (11) of the front sealing assembly.

5. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 3 is characterized by: The support frame (31) comprises a front support frame and a rear support frame, the front support frame is arranged on the front sealing assembly, the rear support frame is arranged on the rear sealing assembly, the front support frame and the rear support frame both comprise a first support leg, a second support leg, a third support leg and a support seat (311), the upper ends of the first support leg, the second support leg and the third support leg are all connected to the support seat (311), the lower ends of the first support leg, the second support leg and the third support leg are arranged on the sealing ring plate (12), the support seat (311) is arranged on the sealing baffle (11), and the action rod (32) is connected to the support seat (311) of the front support frame and the support seat (311) of the rear support frame.

6. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 1 is characterized by: The pipe segment breaking structure (4) comprises a first action arm (41) and a crushing head (42); the first action arm (41) is arranged on the action rod (32); and the crushing head (42) is movably arranged on the outer end of the first action arm (41).

7. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 1 is characterized by: The segment replacement structure (5) comprises a second action arm (51), a telescopic arm (52) and a suction cup (53); the second action arm (51) is arranged on the action rod (32); the telescopic arm (52) is movably arranged at the outer end of the second action arm (51); and the suction cup (53) is movably arranged at the outer end of the telescopic arm (52).

8. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 3 is characterized by: The man gate (6) comprises a man gate compartment (61), a first gate (62) and a second gate (63); the man gate compartment (61) is arranged on a sealing baffle (11) of a front sealing assembly; the first gate (62) is arranged on a front end surface of the man gate compartment (61); and the second gate (63) is arranged on a rear end surface of the man gate compartment (61).

9. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 3 is characterized by: The sealing baffle (11) of the front sealing assembly is provided with a grouting port and a man-gate passage.

10. The construction method for partial replacement of shield-type tunnel limited-intrusion segments according to claim 3 is characterized by: A sealing gasket (13) is provided on the sealing ring plate (12), and the sealing gasket (13) is arranged on the outer side of the sealing ring plate (12).

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