Water-rich stratum super-large section pipe jacking starting tunnel portal sealing device and technological method of water-rich stratum super-large section pipe jacking starting tunnel portal sealing device

Abstract

The invention discloses a water-rich stratum ultra-large section pipe jacking starting portal sealing device and a technological method thereof, relates to the technical field of tunnel starting portals, and solves the technical problems that the sealing effect is reduced due to deformation of a rubber curtain plate and a steel brush is inconvenient to replace due to bending. A storage groove is formed in the inner side of the quasi-rectangular frame, a plurality of steel brush bases are arranged in the storage groove, steel wire brushes are arranged on the steel brush bases, insertion fixing blocks are arranged between the steel brush bases and the storage groove, and the steel brush bases are fixed in the storage groove through the insertion fixing blocks. When the sealing effect is reduced due to fatigue deformation caused by repeated use of the rubber curtain plate, special sealing grease can be injected into the pressure bag through the grease injection pipe, so that the pressure bag expands and actively compensates the deformation amount of the curtain plate, stable contact pressure is continuously provided for a sealing interface, and therefore it is ensured that the sealing performance is maintained within the required range for a long time.

Description

Technical Field

[0001] This invention relates to the field of tunnel launching portal technology, specifically a sealing device and process method for a launching portal of an ultra-large cross-section pipe jacking tunnel in water-rich strata. Background Technology

[0002] When constructing ultra-large cross-section rectangular pipe jacking tunnels in water-rich strata, the sealing of the launching and receiving portals is one of the key factors determining the success or failure of the project. These portals, serving as the crucial passage for the pipe jacking machine to enter and exit the working shaft, must be dynamically and reliably isolated from external water and soil throughout the entire excavation process to prevent mud and water intrusion, ensure operational safety, and effectively control ground settlement.

[0003] Currently, common tunnel portal sealing devices typically use fixed bolts to install rubber curtains and steel brushes on one side of the portal structure. The sealing is achieved by forcibly opening the rubber curtains as the pipe jacking machine advances, causing them to passively adhere to the outer wall of the jacking pipe. At the same time, the fixed steel brush is used to clean impurities from the surface of the jacking pipe.

[0004] First, the rubber curtain relies on the mechanical expansion of the pipe jacking machine, which is a passive deformation seal. During repeated and uneven expansion, the curtain is prone to fatigue, plastic deformation, or even local tearing, which leads to a gradual decrease in sealing pressure and a decline in reliability.

[0005] Secondly, the steel brushes used for cleaning are usually fixed in place and lack a replacement mechanism. After long-term use, the steel brushes are prone to wear, collapse, or bend, creating gaps between them and the pipe wall. This not only renders the cleaning ineffective but may also scratch the sealing elements, accelerating the damage to the overall sealing device.

[0006] Based on this, the present invention provides a sealing device and process method for the starting portal of ultra-large cross-section pipe jacking in water-rich strata to solve the above problems. Summary of the Invention

[0007] In view of the above situation and to overcome the defects of the prior art, the present invention provides a sealing device and process method for the starting tunnel of ultra-large cross-section pipe jacking in water-rich strata. The present invention has a novel structure and ingenious design, and effectively solves the technical problems of reduced sealing effect due to deformation of rubber curtain and inconvenience of replacing bent steel brush.

[0008] A sealing device for the starting portal of a large-section pipe jacking tunnel in a water-rich stratum includes a rectangular frame and a rectangular base. The inner side of the rectangular frame has a receiving groove, and multiple steel brush bases are arranged in the receiving groove. Each steel brush base is equipped with a steel wire brush. Insertion fixing blocks are arranged between the multiple steel brush bases and the receiving groove, and the multiple steel brush bases are fixed in the receiving groove by the insertion fixing blocks.

[0009] Preferably, one side of the storage slot is provided with multiple main mounting slots, and one side of each of the multiple steel brush bases is provided with an auxiliary mounting slot. A stop block is provided in the space formed by the main mounting slots and the auxiliary mounting slots, and a threaded groove is provided on the stop block.

[0010] Preferably, each of the multiple steel brush bases has a limiting groove on one side, and multiple insertion fixing blocks are respectively located in the multiple limiting grooves. Each of the multiple insertion fixing blocks has a through groove, and each of the multiple through grooves is provided with a bearing bolt. The multiple bearing bolts are respectively engaged with the threaded grooves on the multiple stops.

[0011] Preferably, the outer side of the rectangular frame is provided with an injection groove, and a plurality of evenly distributed fixing rods are fixedly connected in the injection groove.

[0012] Preferably, a plurality of threaded bases are fixedly connected to one side of the rectangular frame, and a plurality of through holes are provided on one side of the rectangular bases. Each of the through holes is provided with a clamping bolt, and the rectangular bases are fixed to one side of the rectangular frame by the clamping bolts.

[0013] Preferably, the rectangular base has a pressure groove on its inner side, and the pressure groove is provided with a main rubber curtain, a main flap, an auxiliary rubber curtain, and an auxiliary flap.

[0014] Preferably, both the main rubber curtain and the auxiliary rubber curtain are provided with multiple main fixing holes, both the main flap and the auxiliary flap are provided with multiple auxiliary fixing holes, and multiple spacer brackets are provided between the main flap and the auxiliary rubber curtain.

[0015] Preferably, the main rubber curtain and the auxiliary rubber curtain are both installed on the main fixing hole by clamping bolts, the main flap and the auxiliary flap are both installed on the auxiliary fixing hole by clamping bolts, and the partition bracket is installed by clamping bolts.

[0016] Preferably, a sealing pressure bladder is fixedly connected to the inner side of the main rubber curtain, and a plurality of grease injection tubes are fixedly connected to one side of the main rubber curtain. One end of each of the plurality of grease injection tubes is connected to the sealing pressure bladder, and the other end of each of the plurality of grease injection tubes is fixedly connected to a connecting valve. A plurality of clamping grooves are provided on the side of the quasi-rectangular base away from the quasi-rectangular frame, and the plurality of grease injection tubes are located in the plurality of clamping grooves.

[0017] A process method for sealing the portal of a large-section pipe jacking tunnel in water-rich strata includes the following steps:

[0018] Step 1: Arrange multiple steel brush bases in the storage slot. Push the stop block horizontally between the steel brush base and the storage slot until the stop block moves between the main mounting slot and the auxiliary mounting slot. Rotate the stop block 90 degrees so that it is located in the main mounting slot and the auxiliary mounting slot. Insert the insertion fixing block into the limiting slot on one side of the steel brush base. Insert the bearing bolt on the insertion fixing block into the threaded groove on the stop block and tighten it to fix the placed steel brush base. When disassembling, simply remove the bearing bolt to take the steel brush base out of the storage slot.

[0019] Step 2: Arrange the main rubber curtain, main flap, partition bracket, auxiliary rubber curtain and auxiliary flap in the pressure groove on the rectangular base. Use clamping bolts to pass through the main fixing holes on the main rubber curtain and auxiliary rubber curtain, the auxiliary fixing holes on the main flap and auxiliary flap and the partition bracket, and through the through hole on one side of the rectangular base. Install them in the threaded base on one side of the rectangular frame and tighten them.

[0020] Step 3: After installation, the rectangular frame is fixed by pouring concrete into the grouting tank. Workers can then inject sealing grease into the grease injection pipe through the connecting valve. The sealing grease enters the sealing pressure bladder through the grease injection pipe to assist in the sealing operation when the jacking pipe is inserted.

[0021] The present invention has the following technical effects.

[0022] 1. This invention uses a main rubber curtain, a main flap, an auxiliary rubber curtain, and an auxiliary flap to seal the inserted top pipe. Through a sealing pressure bladder, a grease injection pipe, and a connecting valve, when the rubber curtain undergoes fatigue deformation due to repeated use, resulting in a decrease in sealing effect, special sealing grease can be injected into the pressure bladder through the grease injection pipe. This causes the bladder to expand and actively compensate for the deformation of the curtain, continuously providing a stable contact pressure to the sealing interface, thereby ensuring that the sealing performance is maintained within the required range for a long time.

[0023] 2. The present invention facilitates the replacement of the main rubber curtain, main flap, auxiliary rubber curtain, and auxiliary flap through the threaded base and clamping bolts.

[0024] 3. This invention achieves convenient installation and reliable fixation of the steel brush through the steel brush base, stop block, insertion fixing block and bearing bolt, and allows for easy overall disassembly and replacement when the steel brush is worn, bent or has reduced cleaning efficiency due to long-term use, thereby ensuring effective cleaning of the jacking pipe shell at all times. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the assembly structure of the steel brush base and the insertion fixing block in this invention;

[0028] Figure 3 This is a schematic diagram of the assembly structure of the rectangular frame, rectangular base, and clamping bolts in this invention;

[0029] Figure 4 This is a schematic diagram of the assembly structure of the rectangular frame, storage slot, and main mounting slot in this invention;

[0030] Figure 5 This is a schematic diagram of the assembly structure of the steel brush base, auxiliary mounting groove, and limiting groove in this invention;

[0031] Figure 6 This is a schematic diagram of the assembly structure of the insertion fixing block, the through groove, and the bearing bolt in this invention;

[0032] Figure 7 This is a schematic diagram of the assembly structure of the stop block and the threaded groove in this invention;

[0033] Figure 8 This is a schematic diagram of the assembly structure of the rectangular base, main rubber curtain, and main flap in this invention;

[0034] Figure 9 This is a schematic diagram of the assembly structure of the rectangular base, pressure groove, through hole and clamp groove in this invention;

[0035] Figure 10 This is a schematic diagram of the assembly structure of the main rubber curtain, auxiliary rubber curtain and main flap in this invention;

[0036] Figure 11 This is a schematic diagram of the assembly structure of the main rubber curtain, sealing pressure bladder and grease injection tube in this invention;

[0037] Figure 12 This is a schematic diagram of the assembly structure of the main flap and auxiliary fixing holes in this invention.

[0038] Reference numerals: 1. Rectangular frame; 2. Rectangular base; 3. Injection groove; 4. Fixing rod; 5. Storage groove; 6. Main mounting groove; 7. Stop block; 8. Threaded groove; 9. Steel brush base; 10. Steel wire brush; 11. Auxiliary mounting groove; 12. Limiting groove; 13. Insertion fixing block; 14. Through groove; 15. Bearing bolt; 16. Threaded base; 17. Clamping bolt; 18. Pressure groove; 19. Through hole; 20. Clamping groove; 21. Main rubber curtain; 22. Main fixing hole; 23. Sealing pressure bladder; 24. Grease injection pipe; 25. Connecting valve; 26. Main flap; 27. Auxiliary fixing hole; 28. Auxiliary rubber curtain; 29. ​​Auxiliary flap; 30. Separating bracket. Detailed Implementation

[0039] The foregoing and other technical contents, features and effects of the present invention are described in conjunction with the appendix below. Figures 1 to 12 The detailed description of the embodiments will make this clear. All references to the following embodiments are made with reference to the accompanying drawings.

[0040] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0041] This invention relates to a sealing device for the starting portal of a large-section pipe jacking tunnel in water-rich strata, comprising a rectangular frame 1 and a rectangular base 2. The rectangular frame 1 has an inner groove 5, which is rectangular in shape and accommodates subsequent installation of steel brush bases 9. Multiple steel brush bases 9 are installed within the groove 5, forming a rectangular structure. Gaps exist between the steel brush bases 9 and the groove 5 to facilitate the insertion of fixing blocks 13. Each steel brush base 9 is equipped with a wire brush 10. Fixing blocks 13 are installed between each steel brush base 9 and the groove 5. The fixing blocks 13 are trapezoidal, with the narrower end inserted between the groove 5 and the steel brush base 9. All steel brush bases 9 are fixed within the groove 5 by the fixing blocks 13.

[0042] In this embodiment, during use, the operator arranges the steel brush bases 9 in sequence according to their preset outline and places them one by one into the storage slots 5 on the rectangular frame 1, so that all the steel brush bases 9 are assembled into a complete rectangular closed structure in the storage slots 5. After placement, the corresponding insertion fixing block 13 is inserted into the gap between each steel brush base 9 and the side wall of the storage slot 5. The steel brush base 9 is fixed by the insertion fixing block 13, so that the rectangular structure formed by the steel brush bases 9 can be used to clean the surface of the jacking pipe. After a period of use, the operator can remove the insertion fixing block 13 to disassemble the steel brush base 9.

[0043] As one embodiment, a plurality of main mounting slots 6 are provided on one side of the storage slot 5. The plurality of main mounting slots 6 are rectangular and are evenly distributed on one side of the storage slot 5. The plurality of main mounting slots 6 correspond to and cooperate with a plurality of steel brush bases 9. Auxiliary mounting slots 11 are provided on one side of each of the plurality of steel brush bases 9. The shapes of the plurality of auxiliary mounting slots 11 are the same as the shapes of the plurality of main mounting slots 6 and are corresponding to each other. The main mounting slots 6 and auxiliary mounting slots 11 cooperate to form a rectangular space. A stop block 7 is provided in the space formed by the main mounting slots 6 and auxiliary mounting slots 11. A threaded groove 8 is provided on the stop block 7. The threaded groove 8 on the stop block 7 is located in the gap between the steel brush base 9 and the storage slot 5.

[0044] As an example, a limiting groove 12 is provided on one side of each of the multiple steel brush bases 9. The depth of the limiting groove 12 gradually decreases from the inside to the outside on the steel brush base 9. Multiple insertion fixing blocks 13 are respectively located in the multiple limiting grooves 12. The insertion fixing blocks 13 cooperate with the limiting grooves 12. The two sides of the insertion fixing blocks 13 cooperate with the two sides of the limiting grooves 12. Each of the multiple insertion fixing blocks 13 is provided with a through groove 14. The through groove 14 is composed of circular holes with different diameters at both ends. The screw-in end of the bearing bolt 15 is located in the section with the smaller diameter in the through groove 14. The bolt head of the bearing bolt 15 is located in the section with the larger diameter in the through groove 14. Each of the multiple through grooves 14 is provided with a bearing bolt 15. The multiple bearing bolts 15 are respectively cooperate with the threaded grooves 8 on the multiple stops 7.

[0045] In this embodiment, the steel brush bases 9 are arranged and placed in the storage slots 5 on the rectangular frame 1. After the steel brush bases 9 are placed, the auxiliary mounting slot 11 on one side of the steel brush base 9 and the main mounting slot 6 on one side of the storage slot 5 cooperate to form a rectangular space. An untightened bolt is fitted onto the stop block 7, and then the stop block 7 is pushed between the steel brush base 9 and the storage slot 5. During the continuous pushing process, the stop block 7 moves between the main mounting slot 6 and the auxiliary mounting slot 11. After the stop block 7 moves between the main mounting slot 6 and the auxiliary mounting slot 11, the stop block 7 is pushed to rotate 90 degrees, so that one end of the stop block 7 moves into the main mounting slot 6 and the other end moves into the auxiliary mounting slot 11, thereby limiting the stop block 7 in the storage slot 5. After limiting the steel brush base 9, the insertion fixing block 13 is aligned with the stop block 7 and inserted between the steel brush base 9 and the storage slot 5. When the insertion fixing block 13 is inserted between the steel brush base 9 and the storage slot 5, the insertion... The fixing block 13 is guided and initially positioned by the limiting groove 12 on the side wall of the steel brush base 9. It then gradually embeds itself between the side wall of the steel brush base 9 and the storage groove 5 until the front end of the bearing bolt 15 mounted on the fixing block 13 is aligned with the pre-set threaded groove 8 on the stop block 7. Then the bolt is removed. At this time, the operator screws the bearing bolt 15 so that its threaded end is screwed into the threaded groove 8 on the stop block 7 and continues to tighten it, thereby driving the fixing block 13 to wedge further, and finally firmly locking the steel brush base 9 in the storage groove 5. When the steel brush is worn, bent or deformed after a period of use, resulting in a decrease in cleaning effect, the operator can loosen and remove the bearing bolt 15 in the opposite direction and take it out from the stop block 7. Then the fixing block 13 can be pulled out from the gap between the steel brush base 9 and the storage groove 5, thereby releasing the fixation of the steel brush base 9, making it easy to take it out as a whole and replace it.

[0046] At this time, the stop block 7 can both cooperate with the insertion fixing block 13 to fix the steel brush base 9, and can also be inserted into the cavity between the steel brush base 9 and the storage groove 5 to fix the steel brush base 9. Based on simple operation and ingenious structure, it achieves double insurance fixation of the steel brush base 9.

[0047] As an example, a grouting groove 3 is provided on the outer side of the rectangular frame 1, and multiple fixing rods 4 are fixedly connected inside the grouting groove 3. The multiple fixing rods 4 are evenly distributed inside the grouting groove 3.

[0048] In this embodiment, when using the rectangular frame 1, a rectangular groove of matching size is opened on one side of the starting portal structure. The prefabricated rectangular frame 1 is hoisted as a whole and placed into the groove. After the rectangular frame 1 is in place, high-strength, micro-expansion fine stone concrete or special grout is poured into the grouting groove 3 to fill all the gaps between the frame and the groove wall. Through the embedding effect of the concrete after curing, the rectangular frame 1 is firmly fixed to the portal structure. During this process, the fixing rod 4 provides reliable temporary positioning and shear restraint before the concrete cures, which assists and enhances the final fixing effect.

[0049] As an example, a plurality of threaded bases 16 are fixedly connected to one side of the rectangular frame 1, and a plurality of through holes 19 are opened on one side of the rectangular base 2. The through holes 19 are circular and cooperate with the clamping bolts 17. Each of the plurality of through holes 19 is provided with a clamping bolt 17. The rectangular base 2 is fixed to one side of the rectangular frame 1 by the clamping bolts 17.

[0050] As an example, a pressure groove 18 is provided on the inner side of the rectangular base 2. The pressure groove 18 is rectangular to facilitate the installation of the rectangular main rubber curtain 21, main flap 26, auxiliary rubber curtain 28 and auxiliary flap 29. The main rubber curtain 21, main flap 26, auxiliary rubber curtain 28 and auxiliary flap 29 are provided in the pressure groove 18. The main rubber curtain 21 is in contact with the main flap 26, and the auxiliary rubber curtain 28 and auxiliary flap 29 are in contact with each other.

[0051] As one embodiment, both the main rubber curtain 21 and the auxiliary rubber curtain 28 are provided with multiple main fixing holes 22, and both the main flap 26 and the auxiliary flap 29 are provided with multiple auxiliary fixing holes 27. The main fixing holes 22 are circular and have the same shape and diameter as the auxiliary fixing holes 27. The multiple main fixing holes 22 correspond to the multiple auxiliary fixing holes 27 one by one. Multiple spacer brackets 30 are provided between the main flap 26 and the auxiliary rubber curtain 28. The spacer brackets 30 are rectangular and maintain a distance between the main rubber curtain 21 and the auxiliary rubber curtain 28. The spacer brackets 30 are located between the main fixing holes 22 and the auxiliary fixing holes 27.

[0052] As one embodiment, the main rubber curtain 21 and the auxiliary rubber curtain 28 are both mounted on the clamping bolt 17 through the main fixing hole 22, the main flap 26 and the auxiliary flap 29 are both mounted on the clamping bolt 17 through the auxiliary fixing hole 27, and the spacer bracket 30 is mounted on the clamping bolt 17.

[0053] In this embodiment, after the rectangular frame 1 is installed and fixed, the main rubber curtain 21, main flap 26, partition bracket 30, auxiliary rubber curtain 28, and auxiliary flap 29 are arranged and placed in the pressure groove 18 of the rectangular base 2 according to the design sequence and relative positions. After placement, the clamping bolts 17 are sequentially inserted into the main fixing holes 22 on the main rubber curtain 21 and auxiliary rubber curtain 28, the auxiliary fixing holes 27 on the main flap 26 and auxiliary flap 29, and the partition bracket 30. All clamping bolts 17 are inserted from the rectangular base 2... The bolts 17 protrude from the through holes 19 on the side and are then installed as a whole. The assembled rectangular base 2 is hoisted to the mounting side of the rectangular frame 1. The position is adjusted so that the ends of all the clamping bolts 17 protruding from the rectangular base 2 are aligned with the threaded bases 16 provided on one side of the rectangular frame 1. Finally, each clamping bolt 17 is screwed into the corresponding threaded base 16 using a tool. By applying torque evenly, the entire rectangular base 2 is firmly clamped and fixed to the rectangular frame 1, completing the installation of the sealing module.

[0054] As an example, a sealing pressure bladder 23 is fixedly connected to the inner side of the main rubber curtain 21. The main rubber curtain 21 and the auxiliary rubber curtain 28 have the same shape, and the inner diameters of the main rubber curtain 21 and the auxiliary rubber curtain 28 are the same and smaller than the inner diameter of the rectangular base 2. The sealing pressure bladder 23 is rectangular. A plurality of grease injection tubes 24 are fixedly connected to one side of the main rubber curtain 21. One end of each of the plurality of grease injection tubes 24 is connected to the sealing pressure bladder 23, and the other end of each of the plurality of grease injection tubes 24 is fixedly connected to a connecting valve 25. A plurality of clamping grooves 20 are provided on the side of the rectangular base 2 away from the rectangular frame 1, and the plurality of grease injection tubes 24 are located in the plurality of clamping grooves 20.

[0055] In this embodiment, after the main rubber curtain 21 and the auxiliary rubber curtain 28 are installed, the grease injection tubes 24 on the main rubber curtain 21 and the auxiliary rubber curtain 28 are pulled out into the rectangular base 2 and placed in the clamp groove 20 on the rectangular base 2 to limit the grease injection tubes 24. When the main rubber curtain 21 and the auxiliary rubber curtain 28 are deformed after a period of use, resulting in a decrease in sealing effect, the operator can inject sealing grease into multiple grease injection tubes 24 through the connecting valve 25. The sealing grease enters the sealing pressure bladder 23 through the grease injection tubes 24, thereby expanding the sealing pressure bladder 23 and increasing the sealing effect.

[0056] A process method for sealing the portal of a large-section pipe jacking tunnel in water-rich strata includes the following steps:

[0057] Step 1: Arrange multiple steel brush bases 9 in the storage slot 5. Push the stop block 7 horizontally between the steel brush base 9 and the storage slot 5 until the stop block 7 moves between the main mounting slot 6 and the auxiliary mounting slot 11. Rotate the stop block 7 90 degrees so that the stop block 7 is located in the main mounting slot 6 and the auxiliary mounting slot 11. Insert the insertion fixing block 13 into the limiting slot 12 on one side of the steel brush base 9. Insert the bearing bolt 15 on the insertion fixing block 13 into the threaded groove 8 on the stop block 7 and tighten it to fix the placed steel brush base 9. When disassembling, simply remove the bearing bolt 15 to take the steel brush base 9 out of the storage slot 5.

[0058] Step 2: Arrange the main rubber curtain 21, main flap 26, partition bracket 30, auxiliary rubber curtain 28 and auxiliary flap 29 in the pressure groove 18 on the rectangular base 2. Through the main fixing hole 22 on the main rubber curtain 21 and auxiliary rubber curtain 28, the auxiliary fixing hole 27 on the main flap 26 and auxiliary flap 29 and the partition bracket 30 respectively, and through the through hole 19 on one side of the rectangular base 2, install them in the threaded base 16 on one side of the rectangular frame 1 and tighten them.

[0059] Step 3: After installation, concrete is poured into the grouting tank 3 to fix the rectangular frame 1. The workers can inject sealing grease into the grease injection pipe 24 through the connecting valve 25. The sealing grease enters the sealing pressure bladder 23 through the grease injection pipe 24 to assist in the sealing operation when the jacking pipe is inserted.

[0060] Working principle of this invention:

[0061] In use, firstly, a groove is cut on one side of the starting portal structure, and the rectangular frame 1 is securely installed and fixed in the groove. Then, multiple steel brush bases 9 are arranged in sequence and placed one by one into the pre-set storage slots 5 on the rectangular frame 1. By placing a stop block 7 between the steel brush base 9 and the storage slot 5, and by inserting the stop block 7 into the main mounting slot 6 and the auxiliary mounting slot 11 respectively, the placed steel brush base 9 is limited. The steel brush base 9 is then fastened in place by inserting the fixing block 13 and the bearing bolt 15, which facilitates independent and quick replacement of the wire brush 10 after it wears out.

[0062] Next, the main rubber curtain 21, main flap 26, partition bracket 30, auxiliary rubber curtain 28 and auxiliary flap 29 are arranged in the design order and placed in the corresponding positions of the rectangular base 2. Then, the clamping bolts 17 are used to pass through and limit the movement. These clamping bolts 17 are screwed into the threaded base 16 pre-installed on the rectangular frame 1, thereby firmly installing the entire rectangular base 2 on the side of the rectangular frame 1.

[0063] If the sealing effect of the main rubber curtain 21 and the auxiliary rubber curtain 28 decreases due to deformation after a period of use, the operator can inject high-pressure sealing grease into the sealing pressure bladder 23 through the connecting valve 25 and the grease injection pipe 24. The sealing grease causes the pressure bladder to expand in a controllable manner, thereby actively compensating for the deformation of the main rubber curtain 21 and the auxiliary rubber curtain 28, restoring and enhancing their sealing pressure on the outer wall of the jacking pipe, and ensuring a long-lasting and reliable sealing effect.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing device for the portal of a large-section pipe jacking tunnel in water-rich strata, comprising a rectangular frame (1) and a rectangular base (2), characterized in that, The rectangular frame (1) has a storage groove (5) on its inner side. Multiple steel brush bases (9) are provided in the storage groove (5). Each steel brush base (9) is provided with a wire brush (10). An insertion fixing block (13) is provided between each steel brush base (9) and the storage groove (5). The multiple steel brush bases (9) are fixed in the storage groove (5) by the insertion fixing block (13).

2. The sealing device for the portal of an ultra-large cross-section pipe jacking tunnel in water-rich strata according to claim 1, characterized in that, The storage slot (5) has multiple main mounting slots (6) on one side, and the multiple steel brush bases (9) have auxiliary mounting slots (11) on one side. A stop block (7) is provided in the space formed by the main mounting slots (6) and auxiliary mounting slots (11), and a threaded groove (8) is provided on the stop block (7).

3. The sealing device for the starting portal of a large-section pipe jacking tunnel in water-rich strata according to claim 2, characterized in that, Each of the multiple steel brush bases (9) has a limiting groove (12) on one side, and multiple insertion fixing blocks (13) are located in the multiple limiting grooves (12). Each of the multiple insertion fixing blocks (13) has a through groove (14), and each of the multiple through grooves (14) has a bearing bolt (15). Each of the multiple bearing bolts (15) is engaged with the threaded groove (8) on the multiple stops (7).

4. The sealing device for the portal of an ultra-large cross-section pipe jacking tunnel in water-rich strata according to claim 1, characterized in that, The rectangular frame (1) has an injection groove (3) on its outer side, and a plurality of evenly distributed fixing rods (4) are fixedly connected inside the injection groove (3).

5. A sealing device for the portal of a large-section pipe jacking tunnel in water-rich strata according to claim 1, characterized in that, A plurality of threaded bases (16) are fixedly connected to one side of the rectangular frame (1), and a plurality of through holes (19) are opened on one side of the rectangular base (2). Each of the through holes (19) is provided with a clamping bolt (17). The rectangular base (2) is fixed to one side of the rectangular frame (1) by the clamping bolt (17).

6. The sealing device for the starting portal of a large-section pipe jacking tunnel in water-rich strata according to claim 1, characterized in that, The rectangular base (2) has a pressure groove (18) on its inner side, and the pressure groove (18) is provided with a main rubber curtain (21), a main flap (26), an auxiliary rubber curtain (28) and an auxiliary flap (29).

7. A sealing device for the portal of an ultra-large cross-section pipe jacking tunnel in water-rich strata according to claim 6, characterized in that, Multiple main fixing holes (22) are provided on the main rubber curtain (21) and the auxiliary rubber curtain (28), and multiple auxiliary fixing holes (27) are provided on the main flap (26) and the auxiliary flap (29). Multiple spacer brackets (30) are provided between the main flap (26) and the auxiliary rubber curtain (28).

8. A sealing device for the starting portal of a large-section pipe jacking tunnel in water-rich strata according to claim 7, characterized in that, The main rubber curtain (21) and the auxiliary rubber curtain (28) are both installed on the main fixing hole (22) by clamping bolts (17), the main flap (26) and the auxiliary flap (29) are both installed on the auxiliary fixing hole (27) by clamping bolts (17), and the partition bracket (30) is installed by clamping bolts (17).

9. A sealing device for the starting portal of a large-section pipe jacking tunnel in water-rich strata according to claim 8, characterized in that, A sealing pressure bladder (23) is fixedly connected to the inner side of the main rubber curtain (21). A plurality of grease injection tubes (24) are fixedly connected to one side of the main rubber curtain (21). One end of each of the plurality of grease injection tubes (24) is connected to the sealing pressure bladder (23). The other end of each of the plurality of grease injection tubes (24) is fixedly connected to a connecting valve (25). A plurality of clamping grooves (20) are provided on the side of the rectangular base (2) away from the rectangular frame (1). The plurality of grease injection tubes (24) are located in the plurality of clamping grooves (20).

10. A process method for a sealing device for a large-section pipe jacking tunnel portal in water-rich strata, applied to the sealing device for a large-section pipe jacking tunnel portal in water-rich strata as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Arrange multiple steel brush bases (9) in the storage slot (5), push the stop block (7) horizontally between the steel brush base (9) and the storage slot (5) until the stop block (7) moves between the main mounting slot (6) and the auxiliary mounting slot (11), rotate the stop block (7) 90 degrees so that the stop block (7) is located in the main mounting slot (6) and the auxiliary mounting slot (11), insert the insertion fixing block (13) into the limiting slot (12) on one side of the steel brush base (9), insert the bearing bolt (15) on the insertion fixing block (13) into the threaded groove (8) on the stop block (7) and tighten it to fix the placed steel brush base (9). When disassembling, simply remove the bearing bolt (15) to take the steel brush base (9) out of the storage slot (5); Step 2: Arrange the main rubber curtain (21), main flap (26), partition bracket (30), auxiliary rubber curtain (28) and auxiliary flap (29) in the pressure groove (18) on the rectangular base (2). Through the tightening bolt (17), pass through the main fixing hole (22) on the main rubber curtain (21) and auxiliary rubber curtain (28), the auxiliary fixing hole (27) on the main flap (26) and auxiliary flap (29) and the partition bracket (30), and pass through the through hole (19) on one side of the rectangular base (2), and install it in the threaded base (16) on one side of the rectangular frame (1) for tightening. Step 3: After installation, concrete is poured into the grouting tank (3) to fix the rectangular frame (1). The workers can inject sealing grease into the grease injection pipe (24) through the connecting valve (25). The sealing grease enters the sealing pressure bladder (23) through the grease injection pipe (24) to assist in the sealing operation when the jacking pipe is inserted.

Images