Waterproof device for shield segment joint

Abstract

The invention provides a shield segment joint waterproof device, relates to the technical field of segment waterproof structures, and aims to solve the problems that a waterproof strip in an existing waterproof structure is limited in deformation space, inconvenient to expand and incapable of sealing small gaps to a certain extent. The shield segment joint waterproof device provided by the invention is used for sealing a joint of a segment, and comprises a sealing element, a first water stop strip and a second water stop strip, a containing groove is formed by the two pipe pieces, the two adjacent pipe pieces are in butt joint to enable the containing groove to form a containing space, the sealing piece is arranged in the containing space, and the edge of the sealing piece abuts against the edge of the containing space; a first opening is formed in the sealing part corresponding to the first joint of the two pipe pieces, a second opening is formed in the sealing part corresponding to the second joint, the first water stop strip is arranged in the first opening, the second water stop strip is arranged in the second opening, a through seam is formed in the sealing part, and the first opening and the second opening are communicated through the through seam.

Description

Technical Field

[0001] The invention relates to the technical field of pipe segment waterproof structures, and in particular to a shield pipe segment joint waterproof device. Background Art

[0002] The shield segment joint waterproofing device is a device or material used to prevent water seepage at the joints of shield tunnel segments. In shield tunnel construction, the waterproofing treatment of the segment joints is very critical, because if the joints are not properly waterproofed, groundwater may seep into the tunnel, affecting the normal use of the tunnel and structural safety.

[0003] The existing method to improve the sealing effect of the pipe segment joint is to use elastic sealing pads and water stop strips together. The main function of the elastic sealing pad is to form a sealing layer at the pipe segment joint to prevent the infiltration of groundwater. After the elastic sealing pad and the water stop strip are combined, the elastic sealing pad and the water stop strip have limited space for deformation, so it is not easy for the expanded water stop strip to extend to the periphery, and it is not easy to seal the small gap.

[0004] Therefore, there is an urgent need to provide a shield segment joint waterproof device to solve the problems existing in the prior art to a certain extent. Summary of the invention

[0005] The purpose of the present invention is to provide a shield segment joint waterproof device to solve the problem that the deformation space of the water stop strip in the existing waterproof structure is limited, it is inconvenient to expand, and small gaps cannot be sealed.

[0006] The present invention provides a shield segment joint waterproofing device, which is used for sealing the joints of the segments, and includes a seal, a first waterstop strip and a second waterstop strip; two segments are formed with a receiving groove, and two adjacent segments are butted together to form a receiving space in the receiving groove, and the seal is arranged in the receiving space, and the edge of the seal abuts against the edge of the receiving space; the seal forms a first opening corresponding to the first joint of the two segments, and forms a second opening corresponding to the second joint, the first waterstop strip is arranged in the first opening, and the second waterstop strip is arranged in the second opening, and a through seam is formed on the seal, and the through seam connects the first opening and the second opening.

[0007] As an optional manner, the seal includes a first contact end, a second contact end, a third contact end and a fourth contact end, the first contact end and the third contact end are relatively arranged in the receiving groove of the same tube sheet, and the first contact end and the second contact end are relatively arranged in the receiving space.

[0008] As an optional manner, the surfaces of the first contact end, the second contact end, the third contact end and the fourth contact end that are in contact with the bottom of the accommodating groove are all corrugated surfaces.

[0009] As an optional manner, the sealing member is formed with a first channel axially penetrating through two ends of the sealing member.

[0010] As an optional manner, the first opening and the second opening are both V-shaped, and the cross section of the sealing member is symmetrically butterfly-shaped, and at least two opposite first channels are formed on the sealing member.

[0011] As an optional manner, at least two second channels relative to each other are formed on the sealing member, and the second channels are located on the inner side of the first channels.

[0012] As an optional manner, at least two relative third channels and two relative fourth channels are formed on the seal, and the diameter of the fourth channel is larger than the diameter of the third channel, and the diameter of the third channel is larger than the diameter of the first channel, and the first channel, the third channel and the fourth channel are arranged in sequence along the axial direction.

[0013] As an optional manner, both side edges of the seal are beveled edges, and the two beveled edges gradually converge from the first contact end and the second contact end toward the third contact end and the fourth contact end, part of the first channel, part of the second channel, and part of the third channel all protrude from the beveled edges, and the area of ​​the outer surface corresponding to the first channel is smaller than the area of ​​the outer surface corresponding to the second channel, and the area of ​​the outer surface corresponding to the second channel is smaller than the area of ​​the outer surface corresponding to the third channel.

[0014] As an optional manner, the seal is a split structure, and the seal includes a first sealing part and a second sealing part, the first sealing part forms a first docking part, the second sealing part forms a second docking part, the first docking part and the second docking part are both serrated, and the first sealing part and the second sealing part are connected to each other, so that the cross-section of the seal is butterfly-shaped.

[0015] As an optional manner, it also includes a connecting seat, the first sealing portion and the second sealing portion are in a strip shape, and the connecting seat is L-shaped, and two adjacent first sealing portions or two adjacent second sealing portions are connected via the connecting seat; a positioning column is formed on the end face of the connecting seat, and the positioning column can be inserted into the first channel and / or the second channel and / or the third channel and / or the fourth channel.

[0016] Compared with the prior art, the shield segment joint waterproof device provided by the present invention has the following advantages: The shield segment joint waterproofing device provided by the present invention is used for sealing the joints of the segments, and comprises a seal, a first waterstop strip and a second waterstop strip; two segments are formed with a receiving groove, two adjacent segments are butted together to form a receiving space in the receiving groove, the seal is arranged in the receiving space, and the edge of the seal abuts against the edge of the receiving space; the seal forms a first opening corresponding to the first joint of the two segments, and forms a second opening corresponding to the second joint, the first waterstop strip is arranged in the first opening, the second waterstop strip is arranged in the second opening, and a through seam is formed on the seal, and the through seam connects the first opening and the second opening.

[0017] From this analysis, it can be seen that by butting two adjacent pipe segments, a receiving space can be formed by utilizing the receiving grooves of the two pipe segments. Therefore, the joints of adjacent pipe segments are located in the area corresponding to the receiving space, and by arranging the seal in the receiving space, the sealing of the joint position can be achieved.

[0018] Specifically, the present application can accommodate the first water stop strip and the second water stop strip by forming a first opening corresponding to the first seam position and a second opening corresponding to the second seam position of the sealing member. Usually, the first seam of the pipe segment is the outside, and the water in the tunnel penetrates through the first seam of the pipe segment, thereby contacting the first water stop strip in the first opening. The first water stop strip absorbs water and expands to squeeze the sealing member, thereby making the contact between the sealing member and the receiving groove tighter, thereby improving the sealing degree. When the first water stop strip absorbs water and is saturated, the infiltrated water will enter the second opening through the through seam, thereby making the second water stop strip absorb water and expand, achieving further outward expansion of the sealing strip, thereby achieving a close fit between the sealing member and the side wall of the receiving space, that is, the first opening and the second opening formed by the sealing member can ensure that the first water stop strip and the second water stop strip have a certain degree of deformability, and through the deformation of the first water stop strip and the second water stop strip, the contact between the sealing member and the receiving space can be made tighter, thereby ensuring both the sealing of the first seam and the second seam and the sealing between the sealing member and the receiving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a shield segment joint waterproof device provided by an embodiment of the present invention; Figure 2 Schematic diagram of a seal in a shield segment joint waterproof device provided by an embodiment of the present invention Figure 1 ; Figure 3 Schematic diagram of a seal in a shield segment joint waterproof device provided by an embodiment of the present invention Figure 2 ; Figure 4 An overall structural diagram of a sealing room in a shield segment joint waterproofing device provided by an embodiment of the present invention; Figure 5 A schematic diagram of a split seal in a shield segment joint waterproofing device provided by an embodiment of the present invention; Figure 6 A schematic diagram of the cooperation between the first sealing part and the second sealing part and the connecting seat in the shield segment joint waterproof device provided in an embodiment of the present invention; Figure 7 A schematic diagram of a segment in a shield segment joint waterproofing device provided by an embodiment of the present invention; Figure 8 A schematic diagram of the overall structure of the segments in the shield segment joint waterproofing device provided in an embodiment of the present invention.

[0021] In the figure: 1-pipe segment; 101-accommodating groove; 2-sealing member; 201-bevel; 202-first supporting surface; 203-second supporting surface; 204-first channel; 205-second channel; 206-first opening; 207-second opening; 208-through seam; 209-third channel; 210-fourth channel; 211-first sealing portion; 212-second sealing portion; 213-first docking portion; 214-second docking portion; 3-first water stop strip; 4-second water stop strip; 5-connecting seat; 501-positioning column. DETAILED DESCRIPTION

[0022] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0023] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0027] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0028] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0029] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0030] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0031] Example 1 like Figure 1-Figure 4 As shown, the present invention provides a segment 1 joint waterproofing device, which is used for sealing the joints of the segment 1, and includes a seal 2, a first water stop strip 3 and a second water stop strip 4; two segments 1 are formed with a receiving groove 101, and two adjacent segments 1 are butted together to form a receiving space in the receiving groove 101, and the seal 2 is arranged in the receiving space, and the edge of the seal 2 abuts against the edge of the receiving space; the seal 2 is formed with a first opening 206 corresponding to the first joint of the two segments 1, and a second opening 207 corresponding to the second joint, the first water stop strip 3 is arranged in the first opening 206, and the second water stop strip 4 is arranged in the second opening 207, and a through seam 208 is formed on the seal 2, and the through seam 208 connects the first opening 206 and the second opening 207.

[0032] Compared with the prior art, the pipe segment 1 joint waterproofing device provided by the present invention has the following advantages: The pipe segment 1 joint waterproofing device provided by the present invention is achieved by butting two adjacent pipe segments 1 together, so that a holding space can be formed by utilizing the holding grooves 101 of the two pipe segments 1. Therefore, the joints of adjacent pipe segments 1 are located in the area corresponding to the holding space, and by arranging the sealing member 2 in the holding space, the joint position can be sealed.

[0033] Specifically, the present application forms a first opening 206 corresponding to the first joint position of the seal 2 and a second opening 207 corresponding to the second joint position, so as to accommodate the first water stop strip 3 and the second water stop strip 4. Usually, the first joint of the pipe segment 1 is the outside, and the water in the tunnel penetrates through the first joint of the pipe segment 1, thereby contacting the first water stop strip 3 in the first opening 206. The first water stop strip 3 absorbs water and expands to squeeze the seal 2, so that the contact between the seal 2 and the receiving groove 101 is tighter, thereby improving the sealing degree. When the first water stop strip 3 is saturated with water, the infiltrated water will enter the second opening 207 through the through seam 208, causing the second water stop strip 4 to absorb water and swell, thereby achieving further outward expansion of the sealing strip, thereby achieving a close fit between the seal 2 and the side wall of the accommodating space, that is, the first opening 206 and the second opening 207 formed by the seal 2 can ensure that the first water stop strip 3 and the second water stop strip 4 have a certain degree of deformability, and through the deformation of the first water stop strip 3 and the second water stop strip 4, the contact between the seal 2 and the accommodating space can be made closer, thereby ensuring the sealing of the first joint and the second joint, and the sealing between the seal 2 and the accommodating space.

[0034] In this embodiment, if Figure 1-Figure 4 As shown, the seal 2 in the present application includes a first contact end, a second contact end, a third contact end and a fourth contact end. The first contact end and the third contact end are relatively arranged in the receiving groove 101 of the same pipe segment 1, and the first contact end and the second contact end are relatively arranged in the receiving space.

[0035] By forming four contact ends, sufficient and uniform contact between the seal 2 and the accommodating space can be achieved, thereby improving the stability and sealing between the seal 2 and the pipe segment 1, and avoiding the problem that the seal 2 moves due to uneven force, resulting in the first water stop strip 3 or the second water stop strip 4 moving and failing to accurately correspond to the first seam or the second seam.

[0036] Preferably, if Figure 1-Figure 4 As shown, the surfaces of the first contact end, the second contact end, the third contact end and the fourth contact end in the present application that are in contact with the bottom of the receiving groove 101 are all corrugated surfaces.

[0037] It can be understood that in the present application, the corrugated surface formed by the first contact end and the second contact end is the first supporting surface 202, and the corrugated surface formed by the third contact end and the fourth contact end is the second supporting surface 203. The first supporting surface 202 and the second supporting surface 203 are tightly attached to the bottom surface of the receiving groove 101. Since the cross-section of the single-sided seal 2 is similar to a bow-shaped structure, when the convex point of the bow-shaped structure is squeezed, the first supporting surface 202 and the second supporting surface 203 can be pressed against the bottom surface of the receiving groove 101. When the corrugated surface is pressed against the bottom surface of the receiving groove 101 under force, it can be easily deformed, thereby being close to the bottom surface of the receiving groove 101, thereby improving the sealing effect.

[0038] Alternatively, if Figure 1-Figure 4 As shown, the sealing member 2 in the present application is formed with a first channel 204 that axially passes through both ends of the sealing member 2 .

[0039] Since the pipe segment 1 at this stage is formed by casting, the size of the receiving groove 101 formed by the pipe segment 1 varies during the processing, and the inner surface may not be completely straight. Therefore, different positions of the receiving groove 101 may have different contact pressures with the seal 2, which may easily cause problems with poor sealing.

[0040] The first channel 204 formed in the present application can be used to extrude the seal 2 after the two pipe segments 1 are spliced ​​together. During the extrusion process, the first channel 204 is extruded against the bottom surface of the receiving groove 101, thereby improving the sealing effect.

[0041] Preferably, if Figure 1-Figure 4 As shown, the first opening 206 and the second opening 207 in the present application are both V-shaped, and the cross section of the sealing member 2 is symmetrically butterfly-shaped, and at least two opposite first channels 204 are formed on the sealing member 2 .

[0042] The V-shaped first opening 206 and the second opening 207 can stably support the first water stop strip 3 and the second water stop strip 4, and can ensure the stability and uniformity of the force when under pressure, thereby making the sealing of the overall structure more stable.

[0043] Alternatively, if Figure 1-Figure 4 As shown, at least two opposite second channels 205 are formed on the sealing element 2 in the present application, and the second channels 205 are located on the inner side of the first channel 204 .

[0044] Preferably, the cross-section of the second channel 205 in the present application is elliptical. On the one hand, the second channel 205 can be used to reduce the weight of the overall seal 2. On the other hand, since the second channel 205 is completely formed on the main body of the seal 2, the seal 2 can have a better degree of deformation after the second channel 205 is formed, thereby ensuring the sealing performance.

[0045] More preferably, if Figure 1-Figure 4 As shown, at least two opposite third channels 209 and two opposite fourth channels 210 are formed on the seal 2 in the present application, and the diameter of the fourth channel 210 is larger than the diameter of the third channel 209, and the diameter of the third channel 209 is larger than the diameter of the first channel 204. The first channel 204, the third channel 209 and the fourth channel 210 are arranged in sequence along the axial direction.

[0046] by Figure 1-Figure 3 Taking the viewing direction as an example, in the present application, a circular first channel 204, a third channel 209 and a fourth channel 210 are formed from top to bottom, and the diameter increases successively from top to bottom. It can be understood that since the two side edges of the seal 2 in the present application are beveled edges 201, and the two beveled edges 201 gradually converge from the first contact end and the second contact end to the third contact end and the fourth contact end, and the area of ​​the outer surface corresponding to the first channel 204 is smaller than the area of ​​the outer surface corresponding to the second channel 205, and the area of ​​the outer surface corresponding to the second channel 205 is smaller than the area of ​​the outer surface corresponding to the third channel 209. Therefore, the part protruding from the beveled edge 201 can be located on the same straight line in the vertical direction, so as to ensure that when under pressure, it can contact the bottom wall of the accommodating groove 101 as much as possible at the same time, thereby ensuring uniform force to a certain extent and improving the sealing performance.

[0047] Example 2 As an alternative, Figure 5-Figure 8 As shown, the seal 2 of this embodiment is a split structure, and the seal 2 includes a first sealing portion 211 and a second sealing portion 212. The first sealing portion 211 forms a first docking portion 213, and the second sealing portion 212 forms a second docking portion 214. The first docking portion 213 and the second docking portion 214 are both serrated, and the first sealing portion 211 and the second sealing portion 212 are connected to each other, so that the cross-section of the seal 2 is butterfly-shaped.

[0048] By making the seal 2 a split structure, the arrangement of the seal 2 can be made more flexible, and the serrated first docking portion 213 and the second docking portion 214 can increase the contact area of ​​the first sealing portion 211 and the second sealing portion 212 during docking, while increasing the friction force and ensuring the stability of the docking.

[0049] In this embodiment, if Figure 6As shown, the pipe segment 1 joint waterproofing device provided by the present invention also includes a connecting seat 5, the first sealing portion 211 and the second sealing portion 212 are strip-shaped, and the connecting seat 5 is L-shaped, and two adjacent first sealing portions 211 or two second sealing portions 212 are connected through the connecting seat 5; a positioning column 501 is formed on the end face of the connecting seat 5, and the positioning column 501 can be inserted into the first channel 204 and / or the second channel 205 and / or the third channel 209 and / or the fourth channel 210.

[0050] The L-shaped connecting seat 5 can form a rectangular sealing ring structure after correspondingly connecting the first sealing part 211 or the second sealing part 212, and then can be surrounded in the groove formed by the circumferential side wall of the pipe segment 1. When two adjacent pipe segments 1 are butted, the first sealing part 211 and the second sealing part 212 in the groove are butted, so that they can be squeezed against each other, and then the first sealing part 211 and the second sealing part 212 can be pressed tightly in the groove to ensure the sealing performance.

[0051] It is understandable that, in this embodiment, the first opening 206 and the second opening 207 are formed by the joint of the first sealing portion 211 and the second sealing portion 212, and after the formation, the first water stop strip 3 and the second water stop strip 4 can also be set to ensure the absorption of water vapor. In addition, since there is always a gap at the joint of the split structure, it can also ensure that the water vapor that cannot be absorbed by the first water stop strip 3 penetrates from the joint to the second water stop strip 4, thereby achieving the above function.

[0052] It should be noted here that a positioning column 501 is formed on the connecting seat 5 in the present application, and the shape and number of the positioning column 501 can be designed according to specific needs. Since a first channel 204, a second channel 205, a third channel 209 and a fourth channel 210 are formed on the sealing member 2 in the present application, the positioning column 501 can be one, and one positioning column 501 can be inserted into the first channel 204, the second channel 205, the third channel 209 or the fourth channel 210.

[0053] In order to ensure the stable connection between the connection seat 5 and the first sealing portion 211 or the second sealing portion 212, there are at least two positioning posts 501, and the two positioning posts 501 can be selected to be plugged into any two of the four channels to achieve the connection between the connection seat 5 and the first sealing portion 211 or the second sealing portion 212. Correspondingly, there can also be three or four positioning posts 501, and when there are four positioning posts 501, there are positioning posts 501 in all four channels.

[0054] It is necessary to further explain here that, since the deformability of the overall seal 2 needs to be considered, inserting positioning posts 501 into the four channels will inevitably reduce the deformation. Therefore, the number of positioning posts 501 needs to be designed according to actual sealing requirements, which will not be elaborated here.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shield segment joint waterproof device, used for sealing the joints of segments, characterized in that: It includes a sealing member, a first water stop strip and a second water stop strip; The two tube sheets are formed with a receiving groove, and two adjacent tube sheets are butted together so that the receiving groove forms a receiving space, and the sealing member is arranged in the receiving space, and the edge of the sealing member abuts against the edge of the receiving space; The sealing member has a first opening corresponding to the first seam of the two pipe segments, and a second opening corresponding to the second seam. The first water stop strip is arranged in the first opening, and the second water stop strip is arranged in the second opening. A through seam is formed on the sealing member, and the through seam connects the first opening and the second opening.

2. The shield segment joint waterproof device according to claim 1, characterized in that: The sealing member comprises a first contact end, a second contact end, a third contact end and a fourth contact end, the first contact end and the third contact end are arranged oppositely in a receiving groove of the same tube sheet, and the first contact end and the second contact end are arranged oppositely in the receiving space.

3. The shield segment joint waterproof device according to claim 2, characterized in that: The surfaces of the first contact end, the second contact end, the third contact end, and the fourth contact end that are in contact with the bottom of the accommodating groove are all corrugated surfaces.

4. The shield segment joint waterproof device according to claim 2, characterized in that: The sealing member is formed with a first passage which axially passes through both ends of the sealing member.

5. The shield segment joint waterproof device according to claim 4, characterized in that: The first opening and the second opening are both V-shaped, and the cross section of the sealing member is symmetrically butterfly-shaped. At least two opposite first channels are formed on the sealing member.

6. The shield segment joint waterproof device according to claim 5, characterized in that: At least two second channels facing each other are formed on the sealing member, and the second channels are located inside the first channels.

7. The shield segment joint waterproof device according to claim 6, characterized in that: At least two opposite third channels and two opposite fourth channels are formed on the seal, and the diameter of the fourth channel is larger than the diameter of the third channel, and the diameter of the third channel is larger than the diameter of the first channel. The first channel, the third channel and the fourth channel are arranged in sequence along the axial direction.

8. The shield segment joint waterproof device according to claim 7, characterized in that: Both side edges of the seal are beveled edges, and the two beveled edges gradually converge from the first contact end and the second contact end toward the third contact end and the fourth contact end. Part of the first channel, part of the second channel, and part of the third channel all protrude from the beveled edges, and an area of ​​an outer surface corresponding to the first channel is smaller than an area of ​​an outer surface corresponding to the second channel, and an area of ​​an outer surface corresponding to the second channel is smaller than an area of ​​an outer surface corresponding to the third channel.

9. The shield segment joint waterproof device according to claim 7, characterized in that: The seal is a split structure, and the seal includes a first sealing part and a second sealing part, the first sealing part forms a first docking part, the second sealing part forms a second docking part, the first docking part and the second docking part are both serrated, and the first sealing part and the second sealing part are connected to each other, so that the cross-section of the seal is butterfly-shaped.

10. The shield segment joint waterproof device according to claim 9, characterized in that: It also includes a connecting seat, wherein the first sealing portion and the second sealing portion are in a strip shape, and the connecting seat is in an L shape, and two adjacent first sealing portions or two adjacent second sealing portions are connected through the connecting seat; A positioning column is formed on the end surface of the connecting seat, and the positioning column can be inserted into the first channel and / or the second channel and / or the third channel and / or the fourth channel.

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