Shield tail water stop device and shield tail brush replacement method

Abstract

The present invention provides a shield tail water-stopping device, which is used for water-stopping when replacing the shield tail brush on a shield machine, comprising: an annular first pipe segment, which is arranged at the tail of the shield machine and at least partially located in the shield machine, a gap between the portion of the first pipe segment located in the shield machine and the inner wall of the shield machine, a plurality of first reserved holes are arranged on the first pipe segment, and the first reserved holes are used to fill the gap with shield tail grease; a stop assembly, which is connected to the front end of the first pipe segment and is used to limit the first pipe segment; an annular baffle, which is arranged at the front end of the first pipe segment and at least covers the gap. Double water-stopping by filling the shield tail grease and setting the annular baffle can effectively prevent muddy water in the shield soil from entering the shield machine when replacing the shield tail brush, thereby ensuring the safety of shield construction. In addition, the shield tail water-stopping device provided by the present invention has a simple structure, is easy to construct, and has high replacement efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of shield engineering construction, and in particular to a shield tail water stopping device and a shield tail brush replacement method. Background Art

[0002] The shield construction technology has the advantages of high mechanization, high tunnel quality, and little impact on the surrounding environment. As one of the important lifelines of the shield machine, the shield tail seal is mainly composed of several circles of shield tail brushes. A closed grease cavity is formed between the shield tail brushes. Shield tail grease is injected into the grease cavity through the grease injection hole to prevent the shield tail from deformation and prevent mud and water outside the segment from flowing into the shield machine, ensuring the safety of shield construction.

[0003] During long-distance shield tunneling construction, the shield tail brush is easily damaged or destroyed, which brings safety hazards to the shield construction. Therefore, after a certain distance of shield tunneling construction, the shield tail brush needs to be replaced to ensure construction safety. In the process of replacing the shield tail brush, in order to effectively prevent mud and water outside the shield machine from entering the shield tail and causing safety accidents, it is necessary to take effective water-stopping measures before replacing the shield tail brush. At present, when replacing the shield tail brush, the commonly used water-stopping measure is the freezing method, which uses liquid nitrogen and other substances to quickly freeze the soil at the shield tail to prevent impurities such as mud and water from entering the shield machine. Although the freezing method is safer, due to the low temperature of the freezing construction, it has certain requirements for the low-temperature resistance of the shield tail material. In addition, the freezing construction has high requirements and a long construction period. Summary of the invention

[0004] The purpose of the present invention is to provide a shield tail water stopping device and a shield tail brush replacement method, which have simple structure, are easy to construct and have high replacement efficiency.

[0005] In order to achieve the above object, the present invention provides a shield tail water stopping device, which is used for water stopping when replacing the shield tail brush on the shield machine, comprising:

[0006] An annular first pipe segment is arranged at the tail of the shield machine and at least partially located in the shield machine, a gap is formed between the portion of the first pipe segment located in the shield machine and the inner wall of the shield machine, and a plurality of first reserved holes are arranged on the first pipe segment, and the first reserved holes are used to fill the gap with shield tail grease;

[0007] A backstop assembly connected to the front end of the first pipe segment and used to limit the position of the first pipe segment;

[0008] An annular baffle is arranged at the front end of the first pipe segment and at least covers the gap.

[0009] Optionally, the shield tail brush replacement device also includes at least one ring of second pipe segments, the second pipe segments are located outside the shield machine, the front end of the second pipe segments is connected to the rear end of the first pipe segments, and the second pipe segments are provided with a plurality of second reserved holes, and the second reserved holes are used to fill the gap between the second pipe segments and the shield soil with double liquid slurry.

[0010] Optionally, the first reserved holes and the second reserved holes are evenly arranged along the circumference of the first tube segment and the second tube segment respectively.

[0011] Optionally, the gap between the second pipe segment and the shield soil body is also filled with cement slurry.

[0012] Optionally, part of the first segment is located outside the shield machine, and an annular groove is provided on the outer arc surface of the part of the first segment outside the shield machine and the outer arc surface of the second segment. Through holes are also provided at positions corresponding to the grooves on the first segment and the second segment. The through holes extend from the inner arc surface of the first segment or the second segment to the groove, and an airbag is accommodated in the groove. An inflation tube is accommodated in the through hole, and the inflation tube is connected to the airbag.

[0013] Optionally, a pre-buried steel plate is provided at the front end of the first pipe segment, and the anti-retraction assembly includes a support rod, one end of the support rod is fixed to the shield machine, and the other end is abutted against the pre-buried steel plate.

[0014] Optionally, a pre-embedded steel plate is provided at the front end of the first pipe segment, and the anti-retraction assembly includes a jack, one end of the jack is fixed to the shield machine, and the other end is abutted against the pre-embedded steel plate.

[0015] Optionally, the annular baffle is detachably connected to the embedded steel plate.

[0016] Optionally, the annular baffle covers at least a portion of the embedded steel plate, and the portion where the annular baffle overlaps with the embedded steel plate is threadedly connected.

[0017] Optionally, the outer ring surface of the annular baffle is provided with a circle of water-swellable water-stop strips.

[0018] Based on this, the present application also provides a method for replacing a shield tail brush, using the shield tail water-stopping device to stop water, including:

[0019] Advancing the shield machine so that at least one shield tail brush is exposed outside the first segment;

[0020] A backstop assembly is provided at the front end of the first pipe segment;

[0021] An annular end plate is disposed at the front end of the first segment so that the annular end plate at least covers the gap between the first segment and the inner wall of the shield machine;

[0022] Filling the gap with shield tail grease;

[0023] The shield tail brush exposed outside the first segment is removed and replaced.

[0024] Optionally, the shield tail brush replacement device further includes at least one ring of second segments, the second segments are located outside the shield machine, the front end of the second segments is connected to the rear end of the first segments, the second segments are provided with a plurality of second reserved holes, and after an annular end plate is provided at the front end of the first segments, the shield tail brush replacement method further includes:

[0025] The gap between the second pipe segment and the shield soil body is filled with cement slurry; and,

[0026] The double-liquid slurry is filled into the gap between the second pipe segment and the shield soil through the second reserved hole.

[0027] Optionally, part of the first segment is located outside the shield machine, an annular groove is provided on the outer arc surface of the part of the first segment located outside the shield machine and the outer arc surface of the second segment, and a through hole is further provided at a position corresponding to the groove on the first segment and the second segment, the through hole extends from the inner arc surface of the first segment or the second segment to the groove, and an air bag is accommodated in the groove, an inflation tube is accommodated in the through hole, and the inflation tube is connected to the air bag, and before the gap between the second segment and the shield soil is filled with cement slurry, the shield tail brush replacement method further includes:

[0028] Inflate the airbag through the inflation tube.

[0029] The present invention provides a shield tail water-stopping device and a shield tail brush replacement method, which are used for water-stopping when replacing the shield tail brush on a shield machine. By filling the shield tail with grease and setting an annular baffle for double water-stopping, muddy water in the shield soil can be effectively prevented from entering the shield machine when replacing the shield tail brush, thereby ensuring the safety of shield construction. In addition, the shield tail water-stopping device provided by the present invention has a simple structure, is easy to construct, and has high replacement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a shield tail water stopping device provided in an embodiment of the present invention;

[0031] Figure 2 A schematic structural diagram of a first pipe segment provided in an embodiment of the present invention;

[0032] Figure 3A schematic structural diagram of a second pipe segment provided in an embodiment of the present invention;

[0033] Figure 4 A step diagram of a method for replacing a shield tail brush provided in an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the structure of a shield tail water-stopping device for a shield machine provided in an embodiment of the present invention;

[0035] Figure 6 A schematic diagram of the structure of a shield tail water-stop device for a shield machine provided by an embodiment of the present invention;

[0036] Wherein, the accompanying drawings are marked as follows:

[0037] 10-shield machine; 20-shield tail brush; 30-first segment; 40-annular baffle; 50-second segment; 60-airbag; 70-inflatable tube; 80-embedded steel plate; 90-support rod;

[0038] 300-first reserved hole; 310-shield tail grease; 400-water-expanding waterstop; 500-second reserved hole; 510-double liquid slurry; 520-cement slurry. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention will be described in more detail below in conjunction with the schematic diagram. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0040] like Figure 1 As shown, this embodiment provides a shield tail water stopping device, which is used to stop water when replacing the shield tail brush 20 on the shield machine 10, including:

[0041] An annular first pipe segment 30 is arranged at the rear of the shield machine 10 and at least partially located in the shield machine 10. There is a gap between the portion of the first pipe segment 30 located in the shield machine 10 and the inner wall of the shield machine 10. The first pipe segment 30 is provided with a plurality of first reserved holes 300. The first reserved holes 300 are used to fill the gap with shield tail grease 310.

[0042] A backstop assembly connected to the front end of the first pipe segment 30 and used to limit the first pipe segment 30;

[0043] The annular baffle 40 is disposed at the front end of the first pipe segment 30 and at least covers the gap.

[0044] Specifically, the shield tail water stop device is a water stop device at the tail of the shield machine 10, which is used to prevent muddy water from entering the shield machine 10 when replacing the shield tail brush 20. In shield tunneling construction, the annular pipe segment is usually assembled at the tail of the shield machine 10 and then transferred to the shield soil as the shield machine 10 advances.

[0045] In this embodiment, the front end of the first segment 30 refers to the end of the first segment 30 close to the head of the shield machine 10 , and the rear end of the first segment 30 refers to the end of the first segment 30 away from the head of the shield machine 10 .

[0046] The first pipe segment 30 is a special pipe segment assembled from a plurality of arc-shaped sub-pipe segments, and the first pipe segment 30 is at least partially located in the shield machine 10. It should be understood that due to the different number and position of the shield tail brushes 20 provided at the tail of the shield machine 10, some shield machines 10 have three shield tail brushes 20 at the tail, and some shield machines 10 have four or even five shield tail brushes 20 at the tail. When replacing the shield tail brush 20, it is necessary to expose the replaced shield tail brush 20 outside the first pipe segment 30. The first pipe segment 30 may be completely located in the shield machine 10, or may be partially located in the shield machine 10 and partially located outside the shield machine 10, which can be determined according to actual conditions.

[0047] In this embodiment, please refer to Figure 1 Part of the first pipe segment 30 is located inside the shield machine 10, and part of it is located outside the shield machine 10. There are four shield tail brushes 20. The two shield tail brushes 20 located at the front end of the tail of the shield machine need to be replaced, so the two shield tail brushes 20 are exposed outside the first pipe segment 30.

[0048] Usually, the diameter of the first pipe segment 30 is smaller than the diameter of the tail of the shield machine 10 and smaller than the diameter of the shield soil, so there is a gap between the first pipe segment 30 and the inner wall of the shield machine 10 and the shield soil. In order to prevent muddy water outside the shield machine 10 from entering the tail of the shield machine 10, the gap between the first pipe segment 30 and the inner wall of the shield machine 10 can be filled with shield tail grease 310 through the first reserved hole 300 for sealing.

[0049] In this embodiment, the first pipe segment 30 can be in the form of a steel pipe segment or in the form of reinforced concrete, and this application does not impose any limitation on this.

[0050] Combination Figure 2, the first reserved holes 300 are evenly arranged along the circumference of the first segment 30. In this embodiment, the first segment 30 is a special segment assembled from 6 arcuate sub-segments, each of which is provided with two first reserved holes 300, and the first reserved holes 300 are distributed in a circular array, so that the shield tail grease 310 can be filled into the gap between the first segment 30 and the inner wall of the shield machine 10 through the first reserved holes 300 more evenly.

[0051] Please continue to refer to Figure 1 and Figure 3 , the shield tail brush 20 replacement device also includes at least one ring of second segments 50, the second segments 50 are located outside the shield machine 10, the front end of the second segments 50 is connected to the rear end of the first segments 30, and the second segments 50 are provided with a plurality of second reserved holes 500, and the second reserved holes 500 are used to fill the gap between the second segments 50 and the shield soil with double slurry 510. The second segments 50 are also special segments, which are used to further stop the water at the tail of the shield machine 10 and improve the safety of replacing the shield tail brush 20. It should be understood that the more the number of second segments 50, the longer the water-stopping path, the better the water-stopping effect, but the construction time is longer. Therefore, it is necessary to make a comprehensive consideration based on the soil quality of the shield soil and the safety of the construction. In this embodiment, the number of the second segments 50 is one ring. The second segments 50 can be in the form of steel segments or reinforced concrete, and this application does not impose any restrictions on this.

[0052] In this embodiment, the second reserved holes 500 are evenly arranged along the circumference of the second segment 50. The second segment 50 is a special segment assembled from 6 arc-shaped sub-segments. Two second reserved holes 500 are arranged on each arc-shaped sub-segment, and the second reserved holes 500 are distributed in a circular array, so that the gap between the second segment 50 and the shield soil is filled with double liquid slurry 510 more evenly through the second reserved holes 500. Double liquid slurry 510 refers to a mixture of water glass and calcium chloride solution. By alternately injecting water glass and calcium chloride solution into the soil, the two solutions react rapidly to generate silica gel and calcium silicate gel, which play a role in cementation and filling pores, thereby improving the strength and bearing capacity of the soil, reinforcing the surrounding soil, and improving the water-stopping performance.

[0053] In this embodiment, the gap between the second segment 50 and the shield soil is also filled with cement slurry 520. The cement slurry 520 is used to initially fill the gap between the second segment 50 and the shield soil, and the double liquid slurry 510 is used to further fill the gap to prevent muddy water from entering the shield machine 10.

[0054] Please continue to refer to Figure 1-Figure 3, part of the first pipe segment 30 is located outside the shield machine 10, and an annular groove is provided on the outer arc surface of the first pipe segment 30 located outside the shield machine 10 and the outer arc surface of the second pipe segment 50. A through hole is also provided at a position corresponding to the groove on the first pipe segment 30 and the second pipe segment 50, and the through hole extends from the inner arc surface of the first pipe segment 30 or the second pipe segment 50 to the groove, and an air bag 60 is accommodated in the groove, and an inflation tube 70 is accommodated in the through hole, and the inflation tube 70 is connected to the air bag 60. After the air bag 60 is inflated, the filling volume of the cement slurry 520 and the double liquid slurry 510 can be reduced, so that the double liquid slurry 510 and the cement slurry 520 can fill the gap between the first pipe segment 30 or the second pipe segment 50 and the shield soil more quickly, thereby improving the efficiency of water stopping. Moreover, the inflated airbag can generate an extrusion force on the cement slurry and the double liquid slurry, further preventing the muddy water in the shield soil from passing through the cement slurry and entering the shield machine 10. It should be understood that the size of the annular groove is relatively small and will not affect the strength of the pipe segment. When water stopping is required, the airbag 60 is first inflated through the inflation tube 70, and then the cement slurry 520 is filled, and finally the double liquid slurry 510 is filled to form a multi-channel waterproof structure of annular baffle 40 + shield tail grease 310 + airbag 60 + double liquid slurry 510, which greatly improves the safety of replacing the shield tail brush 20.

[0055] In this embodiment, combined with Figure 1-Figure 2 , a pre-embedded steel plate 80 is provided at the front end of the first segment 30, and the anti-retraction assembly includes a support rod 90, one end of the support rod 90 is fixed to the shield machine 10, and the other end is in contact with the pre-embedded steel plate 80. The pre-embedded steel plate 80 is a steel plate pre-embedded in the first segment 30 when the first segment 30 is formed. The support rod 90 is diagonally supported on the pre-embedded steel plate 80 to prevent the first segment 30 from retracting in the excavation direction of the shield machine 10, so as to ensure that the assembled segment does not move. In this embodiment, since the first segment 30 is an assembled annular segment, it is only necessary to set a support rod 90 under the first segment 30 to fix the entire first segment 30.

[0056] Alternatively, the anti-retraction component is a jack, one end of which is fixed to the shield machine 10 and the other end is in contact with the embedded steel plate 80. The telescopic end of the jack is in contact with the embedded steel plate 80, and the jack is driven to extend to prevent the first segment 30 from moving.

[0057] Optionally, the annular baffle 40 is detachably connected to the embedded steel plate 80. In this embodiment, the annular baffle 40 is used as the last waterproof measure to prevent muddy water in the shield soil from entering the shield machine 10. Since the annular baffle 40 is only used to temporarily stop water when the shield tail brush 20 needs to be replaced, a detachable connection is adopted so that the annular baffle 40 needs to be removed after the replacement.

[0058] In this embodiment, the annular baffle 40 covers at least a portion of the embedded steel plate 80, and the annular baffle 40 and the portion of the embedded steel plate 80 that overlap are threadedly connected. In this embodiment, the annular baffle 40 completely covers the embedded steel plate 80, and the embedded steel plate 80 has a plurality of threaded holes, and the annular baffle 40 is also provided with a plurality of threaded holes correspondingly, and bolts are passed through the corresponding threaded holes on the embedded steel plate 80 and the annular baffle 40 to achieve threaded connection. Of course, the annular baffle 40 and the embedded steel plate 80 may also be connected in other detachable ways, such as pin connection, and this application does not limit this.

[0059] In this embodiment, the outer ring surface of the annular baffle 40 is provided with a circle of water-swellable waterstop strips 400. As the name implies, the water-swellable waterstop strips 400 can expand when encountering water. By providing the water-swellable waterstop strips 400 between the annular baffle 40 and the inner wall of the shield machine 10, the water-stopping effect can be further improved.

[0060] Based on this, please refer to Figure 4-Figure 6 , and combined with Figure 1 The present application also provides a method for replacing a shield tail brush, which uses the shield tail water-stopping device to replace the brush, including:

[0061] Step S1: advancing the shield machine 10 so that at least one shield tail brush 20 is exposed outside the first segment 30;

[0062] Step S2: a stopper assembly is provided at the front end of the first pipe segment 30;

[0063] Step S3: disposing an annular end plate at the front end of the first segment 30 so that the annular end plate at least covers the gap between the first segment 30 and the inner wall of the shield machine 10;

[0064] Step S4: filling the gap with shield tail grease 310;

[0065] Step S5: removing the shield tail brush 20 exposed outside the first pipe segment 30 and replacing it.

[0066] Specifically, first perform step S1, and advance the shield machine 10 so that at least one shield tail brush 20 is exposed outside the first pipe segment 30. In this embodiment, there are four shield tail brushes 20 at the rear of the shield machine 10, and the two shield tail brushes 20 that need to be replaced are near the front end of the shield machine 10. Therefore, it is necessary to advance the shield machine 10 so that the two shield tail brushes 20 are exposed outside the first pipe segment 30 for replacement. At this time, the first pipe segment 30 is partially located inside the shield machine 10 and partially located outside the shield machine 10. Please refer to Figure 5-Figure 6 , Figure 5 This is a schematic structural diagram of a shield tail water-stopping device before the shield machine is advanced provided by an embodiment of the present invention. At this time, the four shield tail brushes 20 are not exposed outside the first pipe segment 30. Figure 6 This is a schematic structural diagram of a shield tail water-stopping device for a shield machine after advancement provided by an embodiment of the present invention. At this time, two shield tail brushes 20 located near the front end of the shield machine 10 are exposed for easy replacement.

[0067] Then, step S2 is performed to set a stopper assembly at the front end of the first segment 30. In this embodiment, one end of the support rod 90 is abutted against the embedded steel plate 80 of the first segment 30, and the other end is fixed to the shield machine 10 to fix the first segment 30.

[0068] Then, step S3 is performed to arrange an annular end plate at the front end of the segment so that the annular end plate at least covers the gap between the first segment 30 and the inner wall of the shield machine 10. In this embodiment, the annular end plate covers at least a portion of the embedded steel plate 80, and the overlapping portion of the annular baffle 40 and the embedded steel plate 80 is connected by bolts.

[0069] In this embodiment, the shield tail brush 20 replacement device also includes a ring of second segments 50, the second segments 50 are located outside the shield machine 10, the front end of the second segments 50 is connected to the rear end of the first segments 30, and the second segments 50 are provided with a plurality of second reserved holes 500. Part of the first segments 30 is located outside the shield machine 10, and an annular groove is provided on the outer arc surface of the first segments 30 located outside the shield machine 10 and the outer arc surface of the second segments 50, and a through hole is also provided at a position corresponding to the groove on the first segments 30 and the second segments 50, and the through hole extends from the inner arc surface of the first segments 30 or the second segments 50 to the groove, and the groove contains an air bag 60, and the through hole contains an inflation tube 70, and the inflation tube 70 is connected to the air bag 60. After executing step S3, the shield tail brush 20 replacement method also includes:

[0070] The airbag 60 is inflated through the inflation tube 70 .

[0071] The gap between the second pipe segment 50 and the shield soil is filled with cement slurry 520; and,

[0072] The double-liquid slurry 510 is filled into the gap between the second pipe segment 50 and the shield soil through the second reserved hole 500 .

[0073] Then, step S4 is performed to fill the gap with shield tail grease 310. Alternatively, filling the shield tail grease 310 and filling the cement slurry 520 can be performed simultaneously, and the present application does not limit this.

[0074] After executing step S4, a multi-layer waterproof structure including annular baffle 40+shield tail grease 310+air bag 60+double liquid slurry 510 is formed. After a period of time, the consolidation effect of the double liquid slurry 510 is observed by using the second reserved hole 500. After confirming that the shield tail is well sealed, step S5 is executed to remove the shield tail brush 20 exposed outside the first pipe segment 30 and replace it.

[0075] Specifically, remove the two shield tail brushes 20 at the front end of the shield tail piece by piece and remove them in time, then clean the inside of the shield tail, and check whether the grouting pipeline and injection port at the shield tail are intact. Install a new shield tail brush 20, and apply shield tail grease 310 in the new shield tail brush 20. After the replacement is completed, continue to assemble the pipe segment, remove the anti-retraction component at the same time, and seal the first reserved hole 300, the second reserved hole 500 and the through hole on the second pipe segment 50.

[0076] In summary, the present invention provides a shield tail water-stopping device and a shield tail brush replacement method, which are used for water-stopping when replacing the shield tail brush on a shield machine. The shield tail water-stopping device includes: an annular first pipe segment, which is arranged at the tail of the shield machine and at least partially located in the shield machine, and there is a gap between the part of the first pipe segment located in the shield machine and the inner wall of the shield machine, and a plurality of first reserved holes are arranged on the first pipe segment, and the first reserved holes are used to fill the shield tail grease into the gap; a stop assembly, which is connected to the front end of the first pipe segment and is used to limit the first pipe segment; an annular baffle, which is arranged at the front end of the first pipe segment and at least covers the gap. Double water-stopping by filling the shield tail grease and setting the annular baffle can effectively prevent muddy water in the shield soil from entering the shield machine when replacing the shield tail brush on the shield machine, thereby ensuring the safety of shield construction. In addition, the shield tail water-stopping device provided by the present invention has a simple structure, is easy to construct, and has high replacement efficiency.

[0077] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A method for replacing a shield tail brush, characterized in that: include: Advancing the shield machine so that at least one shield tail brush is exposed outside the annular first pipe segment, the first pipe segment is arranged at the tail of the shield machine and at least partially located inside the shield machine, a gap exists between the portion of the first pipe segment located inside the shield machine and the inner wall of the shield machine, a plurality of first reserved holes are arranged on the first pipe segment, a rear end of the first pipe segment is connected to a ring of second pipe segments located outside the shield machine, a front end of the second pipe segment is connected to the rear end of the first pipe segment, and a plurality of second reserved holes are arranged on the second pipe segment; A backstop assembly is arranged at the front end of the first pipe segment, and the backstop assembly is used to limit the position of the first pipe segment; An annular baffle is arranged at the front end of the first segment so that the annular baffle at least covers the gap between the first segment and the inner wall of the shield machine; The gap between the second pipe segment and the shield soil is filled with cement slurry; and the gap between the second pipe segment and the shield soil is filled with double liquid slurry through the second reserved hole; Filling the shield tail grease into the gap through the first reserved hole; The shield tail brush exposed outside the first segment is removed and replaced.

2. The method for replacing the shield tail brush according to claim 1, characterized in that: Part of the first pipe segment is located outside the shield machine, an annular groove is provided on the outer arc surface of the part of the first pipe segment located outside the shield machine and the outer arc surface of the second pipe segment, and a through hole is also provided at a position corresponding to the groove on the first pipe segment and the second pipe segment, the through hole extends from the inner arc surface of the first pipe segment or the second pipe segment to the groove, and an air bag is accommodated in the groove, and an inflation tube is accommodated in the through hole, and the inflation tube is connected to the air bag. Before the gap between the second pipe segment and the shield soil body is filled with cement slurry, the shield tail brush replacement method also includes: Inflate the airbag through the inflation tube.

3. The method for replacing the shield tail brush according to claim 1, characterized in that: The first reserved holes and the second reserved holes are evenly arranged along the circumference of the first tube segment and the second tube segment respectively.

4. The method for replacing the shield tail brush according to claim 1, characterized in that: An embedded steel plate is provided at the front end of the first pipe segment, and the anti-retraction assembly includes a support rod, one end of which is fixed to the shield machine, and the other end of which is in contact with the embedded steel plate.

5. The method for replacing the shield tail brush according to claim 1, characterized in that: An embedded steel plate is arranged at the front end of the first pipe segment, and the anti-retraction assembly comprises a jack, one end of the jack is fixed on the shield machine, and the other end is in contact with the embedded steel plate.

6. The method for replacing the shield tail brush according to claim 4 or 5, characterized in that: The annular baffle is detachably connected to the embedded steel plate.

7. The method for replacing the shield tail brush according to claim 6, characterized in that: The annular baffle covers at least a portion of the embedded steel plate, and the portion where the annular baffle overlaps with the embedded steel plate is threadedly connected.

8. The method for replacing the shield tail brush according to claim 1, characterized in that: The outer ring surface of the annular baffle is provided with a circle of water-swelling water-stopping strips.

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