A vertical lifting mechanism for pipes with improved sealing structure

Abstract

An improved vertical lifting mechanism for pipes with a sealed structure includes a pipe section, a lifting device disposed inside the pipe section, a fixing sleeve, a first sealing ring, a second sealing ring, a pre-embedded pipe, and a grease injection pipe. The top of the pipe wall of the pipe section has an opening. The fixing sleeve is fixedly installed on the inner wall of the pipe section and aligned with the opening. Its inner circumferential wall forms a first and a second groove spaced vertically apart. The first and second sealing rings are respectively assembled in the first and second grooves. The pre-embedded pipe is vertically and retractably inserted into the fixing sleeve, and its outer circumferential wall forms a sealing fit with the first and second sealing rings. The lifting device drives the pre-embedded pipe to rise relative to the fixing sleeve. The outlet end of the grease injection pipe is connected to the first groove. This invention forms a redundant seal through a double-sealing ring structure, effectively preventing water and soil seepage caused by single-point failure. The grease injection pipe allows for routine grease injection to reduce friction and extend the life of the sealing rings. In case of leakage, sealant can be quickly injected for emergency sealing without disassembling the structure, avoiding construction interruption and the risk of water and soil backflow.

Description

Technical Field

[0001] This utility model relates to the field of construction equipment technology, specifically to a vertical lifting mechanism inside a pipe with an improved sealing structure. Background Technology

[0002] In the vertical jacking construction of underground pipeline projects, the sealing structure is a key component to ensure the dryness of the interior of the horizontal steel jacking pipe and prevent the infiltration of external water and soil. Traditional vertical jacking devices mostly adopt a single-seal design, relying on only one sealing ring to achieve a seal, which poses the risk of "leakage due to single-point failure" and is difficult to meet the long-term construction safety requirements.

[0003] To address this issue, an optimized double-seal solution has emerged in the industry. For example, the Chinese utility model patent application number 201921211428.5 (authorization announcement number CN210266161U) discloses a "Vertical Lifting Device for Horizontal Steel Jacking Pipes," which features a double-seal groove structure inside the outer steel sleeve: a first water-stopping neoprene rubber ring is installed in the annular sealing groove at the top of the outer steel sleeve, and a second water-stopping neoprene rubber ring is installed in the annular cavity formed by the sealing groove and the top of the steel pressure ring. Through the redundant protection of the two sealing rings, the leakage risk of a single seal is improved.

[0004] However, the double-seal structure of this lifting device still has significant shortcomings: its double-seal grooves are only used for fixing the sealing ring, and do not address the maintenance issues during daily use or emergency plans for accidental leaks. On the one hand, friction between the sealing ring and the pipe section during lifting construction easily leads to wear, and this structure lacks friction-reducing optimization design, relying solely on the wear resistance of the sealing ring itself, thus shortening the seal's lifespan. On the other hand, if the first sealing ring leaks, the lack of a dedicated emergency channel prevents rapid sealing, requiring the disassembly of the outer steel sleeve and steel pressure ring to replace the sealing ring. This not only interrupts construction and increases costs but may also pose a risk of water and soil backflow.

[0005] Therefore, based on the existing double-seal groove structure, how to achieve the dual functions of "daily lubrication and friction reduction" and "emergency glue injection and sealing" by adding a dedicated functional channel, while retaining the advantages of double sealing, and effectively addressing wear and leakage problems, has become a technology that technicians in this field urgently need to solve. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an improved pipe vertical lifting mechanism with a dedicated channel that can realize daily oil injection for friction reduction and emergency glue injection for sealing, in view of the above-mentioned technical status.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a vertical lifting mechanism for pipes with improved sealing structure, comprising horizontally arranged pipe sections and a lifting device disposed in the cavity inside the pipe sections, wherein the top of the pipe wall of the pipe section has a vertical opening, and further comprising:

[0008] A fixing sleeve is fixedly installed on the inner wall of the pipe section and aligned with the vertical opening at the top of the pipe section wall. The inner peripheral wall has a first groove and a second groove spaced apart vertically.

[0009] A first sealing ring and a second sealing ring, wherein the first sealing ring is fitted into the first groove cavity and the second sealing ring is fitted into the second groove cavity.

[0010] The embedded pipe is vertically and vertically inserted into the fixed sleeve, and its outer peripheral wall forms a sealing fit with the first sealing ring and the second sealing ring respectively. The lifting device is used to drive the embedded pipe to be lifted upward relative to the fixed sleeve.

[0011] At least one grease injection tube, the outlet end of which is connected to the chamber of the first groove.

[0012] To achieve graded sealing and facilitate maintenance of the second seal, preferably, the inner peripheral wall of the fixed sleeve is provided with an upper annular flange and a lower annular flange spaced apart, and the gap between the upper annular flange and the lower annular flange forms the first groove cavity; a sealing ring pressure plate can also be detachably provided on the fixed sleeve, and the gap between the sealing ring pressure plate and the lower annular flange forms the second groove cavity.

[0013] To improve structural integrity and load-bearing capacity and ensure long-term stability, preferably, the fixing sleeve includes a vertically extending sleeve and a base plate laterally connected to the bottom of the outer periphery of the sleeve. The top of the sleeve and the end of the base plate are both connected to the inner wall of the pipe section. The upper annular flange and the lower annular flange are provided on the inner wall of the sleeve. The sealing ring pressure plate is detachably connected to the base plate by a first fastener.

[0014] To facilitate precise installation of the sealing ring and provide stable support, and to optimize the structure of the second groove cavity, preferably, the sealing ring pressure plate includes a vertically extending annular support portion and a connecting plate laterally connected to the bottom of the outer periphery of the annular support portion. The top of the annular support portion is provided with a ring of support plates for abutting the bottom of the sealing ring. The connecting plate and the base plate are respectively provided with mounting holes for the first fastener to pass through.

[0015] To ensure the sealing of the grease injection channel and achieve effective lubrication and emergency sealing, preferably, the sleeve has an inlet port that communicates with the first groove cavity on its side wall, the outlet end of the grease injection tube is sealed to the inlet port, and the inlet end of the grease injection tube passes through the bottom plate and is exposed.

[0016] To facilitate routine maintenance and simplify grease injection, preferably, the inlet end of the grease injection tube is connected to a grease injection nozzle, which is located at the bottom of the base plate.

[0017] In order to achieve temporary sealing of the top of the pre-embedded pipe during the jacking process and to provide precise positioning and reliable sealing, preferably, the top of the pre-embedded pipe is detachably fitted with a cap for sealing the pipe opening, and a third sealing ring is provided between the cap and the pre-embedded pipe.

[0018] In order to facilitate the balance of internal and external pressures in the pipeline during construction and achieve controllable water injection, preferably, the cap is provided with a water inlet channel that runs through its upper and lower end faces to allow external water to enter the interior of the pre-embedded pipe.

[0019] In order to achieve automatic drainage and effectively prevent backflow during construction and maintain long-term stable operation, preferably, the top of the pre-buried pipe is provided with a one-way valve that can replace the cap. The one-way valve is configured to allow water inside the pre-buried pipe to flow unidirectionally to the river outside the pipe under the action of water pressure difference, and can prevent the river water from flowing back into the pre-buried pipe.

[0020] To adapt to different engineering depth requirements and ensure the flatness of the sealing surface and structural integrity after the connection of multiple pipe sections, preferably, multiple embedded pipes are configured. Each embedded pipe has a fastener mounting groove on the outer peripheral wall near its upper and lower ends, and the upper and lower end faces of the embedded pipe have through holes that penetrate to the fastener mounting groove. Adjacent embedded pipes can be detachably connected by fasteners assembled in the fastener mounting groove and passing through the through hole. The connection part between adjacent embedded pipes is filled with concrete to form a flat outer peripheral surface that matches the first sealing ring and the second sealing ring.

[0021] Compared with the prior art, the advantages of this utility model are as follows: by opening a vertical opening at the top of the horizontally arranged pipe section and setting a fixed sleeve aligned with the opening on its inner wall, the inner peripheral wall of the fixed sleeve forms a first groove and a second groove spaced vertically, and assembling a first sealing ring and a second sealing ring respectively. At the same time, a pre-embedded pipe that can be raised and lowered vertically through the fixed sleeve is set, so that its outer peripheral wall forms a sealing fit with the two sealing rings, and the pre-embedded pipe is driven to be raised upward by a lifting device. In addition, at least one grease injection pipe is set so that its outlet end is connected to the first groove. By incorporating a double-seal ring structure within the fixed sleeve, redundant sealing protection is created, effectively preventing external water and soil infiltration caused by single-seal failure and improving sealing reliability during the jacking process. Simultaneously, by installing a grease injection pipe connected to the first cavity, lubricating grease can be injected during routine construction to reduce friction between the seal ring and the embedded pipe, extending the seal ring's service life. In the event of leakage, sealant can be quickly injected through the grease injection pipe for emergency sealing, avoiding construction interruptions and the risk of water and soil backflow. Ultimately, while retaining the advantages of double sealing, this addresses the shortcomings of existing double-seal structures, which lack maintenance channels and emergency plans. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the transverse cross-sectional structure of this embodiment;

[0023] Figure 2 for Figure 1 A magnified structural diagram of part A;

[0024] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of this embodiment. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Figures 1-3 The figure shown is the preferred embodiment of this utility model.

[0027] The improved sealing structure of the vertical lifting mechanism inside the pipe in this embodiment mainly includes a pipe section 1, a lifting device 2, a fixing sleeve 3, a first sealing ring 4, a second sealing ring 5, a pre-embedded pipe 6, a grease injection pipe 7, a sealing ring pressure plate 8, and a first fastener 9. The improved sealing structure of the vertical lifting mechanism inside the pipe disclosed in this embodiment aims to solve the problems of "single-point failure leading to leakage" in traditional single seals and the lack of maintenance channels and emergency sealing plans in existing double seals, so as to achieve reliable sealing, convenient maintenance and safe operation during the vertical lifting process inside the pipe.

[0028] The structure and connection relationships of each component are as follows:

[0029] Pipe section 1: Reference Figures 1 to 3As shown, pipe section 1 is a horizontally arranged tubular structure that serves as the installation base for the entire lifting mechanism. A vertical opening 1a is provided at the top of its pipe wall for the pre-embedded pipe 6 to pass through vertically. The inner wall of pipe section 1 is used to fix and install the fixing sleeve 3, ensuring that the fixing sleeve 3 is precisely aligned with the vertical opening 1a to prevent the pre-embedded pipe 6 from shifting during lifting.

[0030] Lifting device 2: Reference Figure 1 and Figure 3 As shown, the lifting device 2 uses a hydraulic jack adapted to the weight of the pre-embedded pipe 6, and is installed inside the cavity of the pipe section 1. Its output end abuts against the bottom of the pre-embedded pipe 6 to provide vertical driving force, so that the pre-embedded pipe 6 can be lifted upward relative to the fixed sleeve 3. It adopts a "segmented jacking" operation mode. First, a section of the pre-embedded pipe 6 is jacked to above the bottom of the riverbed, then the equipment is lowered, a new pre-embedded pipe 6 is installed and fixed, and the jacking operation is repeated until the device reaches the preset height. It eliminates the need to hoist a long pipe body at once, reducing the construction difficulty, and the operators work inside the underground pipe gallery.

[0031] Fixing sleeve 3: Reference Figures 1 to 3 As shown, the fixing sleeve 3 is fixedly installed on the inner wall of the pipe section 1 and aligned with the vertical opening 1a. It includes a vertically extending sleeve 3e and a base plate 3f horizontally connected to the bottom of the outer periphery of the sleeve 3e. The top of the sleeve 3e is welded and fixed to the inner wall of the pipe section 1. Its inner periphery is provided with an upper annular flange 3c and a lower annular flange 3d spaced apart, and the gap between the two forms a first groove 3a. An inlet port 3g communicating with the first groove 3a is opened on the side wall of the sleeve 3e for connecting the grease injection tube 7. The end of the base plate 3f is welded and fixed to the inner wall of the pipe section 1. It has a channel for the grease injection tube 7 to pass through. The inlet end of the grease injection tube 7 passes through the channel and is exposed. The inlet end is connected to a grease injection nozzle 11, which is located at the bottom of the base plate 3f for easy injection of lubricating grease or sealing glue.

[0032] First sealing ring 4 and second sealing ring 5: (Reference) Figure 1 and Figure 2 As shown, the first sealing ring 4 is fitted into the first groove 3a of the sleeve 3e, and its inner side is tightly fitted against the outer peripheral wall of the embedded pipe 6 to form a first seal; the second sealing ring 5 is fitted into the second groove 3b, which is formed by the gap between the sealing ring pressure plate 8 and the lower annular flange 3d, and its inner side is also tightly fitted against the outer peripheral wall of the embedded pipe 6 to form a second redundant seal. In this embodiment, both the first sealing ring 4 and the second sealing ring 5 can be made of rubber or silicone material with good wear resistance and sealing performance.

[0033] Sealing ring pressure plate 8: Reference Figures 1 to 3As shown, the sealing ring pressure plate 8 is detachably connected to the base plate 3f of the fixed sleeve 3 via the first fastener 9. It includes an annular support portion 8a extending vertically to the inner side of the sleeve 3e and a connecting plate 8b horizontally connected to the bottom of the outer periphery of the annular support portion 8a. A support plate 8c is provided at the top of the annular support portion 8a to abut against the bottom of the second sealing ring 5, preventing the second sealing ring 5 from falling off during the lifting and lowering of the embedded pipe 6. The connecting plate 8b and the base plate 3f have corresponding mounting holes 10 for the first fastener 9 to pass through, ensuring a stable connection between the two. Since the sealing ring pressure plate 8 is detachably connected via the first fastener 9, when the second sealing ring 5 wears down due to long-term friction and its sealing performance deteriorates, it is not necessary to disassemble the entire fixed sleeve 3. Simply unscrew the first fastener 9 and remove the sealing ring pressure plate 8 to quickly remove the old second sealing ring 5 and replace it with a new one, significantly shortening maintenance time and reducing operational complexity. In this embodiment, the first fastener 9 is a bolt.

[0034] Grease infusion cannula 7 and grease infusion nozzle 11: Reference Figure 1 and Figure 2 As shown, the grease injection pipe 7 penetrates the sleeve 3e wall of the fixed sleeve 3 radially, and its outlet end is sealed to the liquid inlet 3g of the sleeve 3e to prevent leakage; the inlet end of the grease injection pipe 7 passes through the bottom plate 3f and is connected to the grease injection nozzle 11, which is located at the bottom of the bottom plate 3f, making it convenient for construction personnel to connect the grease injection equipment.

[0035] Embedded pipe 6: Reference Figures 1 to 3 As shown, the embedded pipe 6 is vertically and retractably inserted into the sleeve 3e of the fixed sleeve 3, and its outer peripheral wall forms a sealing fit with the first sealing ring 4 and the second sealing ring 5 respectively. Multiple embedded pipes 6 are configured, and each embedded pipe 6 has a fastener mounting groove 6a on its outer peripheral wall near its upper and lower ends, and through holes 6b extending through the fastener mounting groove 6a are opened on its upper and lower end faces. Adjacent embedded pipes 6 are detachably connected by fasteners installed in the fastener mounting groove 6a and passing through the through holes 6b. After the fasteners are installed, the fastener mounting groove 6a can be filled with concrete or other similar filling materials. After the concrete cures, it forms a flat outer peripheral surface that fits the first sealing ring 4 and the second sealing ring 5, ensuring a tight seal.

[0036] 12-inch cap: Reference Figure 1 and Figure 3 As shown, the cap 12 is detachably installed on the top of the pre-embedded pipe 6 by bolts or snap-fit ​​structure to seal the pipe opening of the pre-embedded pipe 6; the outer peripheral edge of the cap 12 protrudes from the outer peripheral wall of the pre-embedded pipe 6 and can abut against the top of the upper annular flange 3c; a third sealing ring 13 is provided between the cap 12 and the pre-embedded pipe 6 to enhance the sealing of the connection between the two; at the same time, a water inlet channel 12a is provided on the cap 12, penetrating its upper and lower end faces, to allow external water to enter the interior of the pre-embedded pipe 6, so that the interior of the pre-embedded pipe 6 is filled with water to balance the internal and external pressure.

[0037] One-way valve: In this embodiment, the one-way valve can replace the cap 12 and be installed on the top of the pre-buried pipe 6. The one-way valve adopts a structure similar to the one-way valve of a range hood and is installed at the top outlet end of the pre-buried pipe 6. After the device is installed and fixed, the cap 12 on the top of the pre-buried pipe 6 needs to be removed by underwater workers and replaced with the one-way valve. Its conduction direction is set to allow the water inside the pre-buried pipe 6 to flow unidirectionally to the river outside the pipe under the action of water pressure difference, and can block the backflow of river water into the pre-buried pipe 6. When there is no sewage discharge, it can automatically close under the action of river water pressure to block the backflow path of river water and ensure the dry environment inside the pipe gallery and the safety of operators.

[0038] The working principle of the improved sealing structure and vertical lifting mechanism inside the pipe in this embodiment is as follows:

[0039] 1. Sealing and Protection Principle: When the pre-embedded pipe 6 is lifted and lowered along the sleeve 3e under the drive of the lifting device 2, its outer peripheral wall is always in close contact with the first sealing ring 4 and the second sealing ring 5, forming a double seal. The first sealing ring 4 acts as the main seal, blocking most of the external water and soil; if the first sealing ring 4 fails, the second sealing ring 5 can act as the first layer of protection, preventing water and soil from directly seeping into the pipe section 1, thus solving the problem of easy leakage in traditional single seals; at the same time, the third sealing ring 13 between the cap 12 and the pre-embedded pipe 6 can prevent water from leaking from the top opening of the pre-embedded pipe 6.

[0040] 2. Maintenance and Replacement Principle of the Second Sealing Ring: When the sealing performance of the second sealing ring 5 deteriorates due to long-term friction and wear, the operator can directly unscrew the first fastener 9 inside the pipe section 1 and remove the sealing ring pressure plate 8 from the base plate 3f. At this time, the second sealing ring 5 loses the abutment limit of the support plate 8c and can be directly removed from the second groove 3b. After replacing the second sealing ring 5, the sealing ring pressure plate 8 is aligned with the mounting hole 10 again and the first fastener 9 is tightened to complete the maintenance. The whole process does not require disassembling the connection between the fixing sleeve 3 and the pipe section 1, nor does it require interrupting the overall process of jacking construction, realizing the rapid replacement of the second sealing ring 5, greatly improving maintenance efficiency and reducing construction costs.

[0041] 3. Routine Maintenance and Emergency Sealing Principle: During routine construction, grease is injected into the grease injection pipe 7 through the grease injection nozzle 11. The grease enters the first groove cavity 3a through the liquid inlet 3g, forming a lubricating layer between the first sealing ring 4 and the pre-embedded pipe 6, reducing friction and wear between the two and extending the service life of the first sealing ring 4. If the first sealing ring 4 leaks, sealing glue can be quickly injected through the grease injection pipe 7. The sealing glue solidifies in the first groove cavity 3a, temporarily blocking the leakage channel without disassembling the fixing sleeve 3 and the sealing ring pressure plate 8, thus avoiding construction interruption. During this process, the second sealing ring 5 continues to play a sealing role, preventing water and soil from flowing back into the pipe section 1.

[0042] 4. Connection and principle of embedded pipes: Multiple embedded pipes 6 are connected in a detachable manner through fastener mounting slots 6a and through holes 6b, which meet the needs of different jacking heights; the concrete filling the connection part forms a flat outer circumference to ensure the sealing fit between the embedded pipe 6 and the sealing ring.

[0043] 5. Water Inlet and Drainage Principle: During operation, external water can enter the pre-buried pipe 6 through the water inlet channel 12a of the cap 12, filling the pre-buried pipe 6 with water and balancing the water pressure inside and outside the pre-buried pipe 6. If it is necessary to drain the water inside the pre-buried pipe 6, the cap 12 can be replaced with a one-way valve 14. The water inside the pre-buried pipe 6 will push the one-way valve 14 to open under the action of water pressure difference and discharge it to the river outside the pipe. When the water pressure in the river is greater than the water pressure inside the pre-buried pipe 6, the one-way valve 14 will automatically close, blocking the backflow of river water and ensuring that the inside of the pre-buried pipe 6 is dry.

[0044] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are merely 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

Claims

1. A pipe jacking mechanism with improved sealing structure, comprising a transversely arranged pipe section (1) and a jacking device (2) arranged in the internal cavity of the pipe section (1), a vertical opening (1a) being formed at the top of the pipe wall of the pipe section (1), characterized in that, Also includes: The fixing sleeve (3) is fixedly installed on the inner wall of the pipe section (1) and aligned with the vertical opening (1a) at the top of the pipe wall of the pipe section (1). The inner peripheral wall has a first groove (3a) and a second groove (3b) spaced apart vertically. A first sealing ring (4) and a second sealing ring (5), wherein the first sealing ring (4) is fitted into the first groove (3a) and the second sealing ring (5) is fitted into the second groove (3b). The embedded pipe (6) is vertically and vertically inserted into the fixed sleeve (3), and its outer peripheral wall forms a sealing fit with the first sealing ring (4) and the second sealing ring (5) respectively. The lifting device (2) is used to drive the embedded pipe (6) to be lifted upward relative to the fixed sleeve (3). At least one grease injection tube (7) is provided, the outlet end of which is connected to the chamber of the first groove (3a).

2. The pipe jacking mechanism with improved sealing structure according to claim 1, wherein: The inner peripheral wall of the fixed sleeve (3) is provided with an upper annular flange (3c) and a lower annular flange (3d) spaced apart from each other, and the gap between the upper annular flange (3c) and the lower annular flange (3d) forms the first groove cavity (3a). The fixing sleeve (3) is also detachably provided with a sealing ring pressure plate (8), and the gap between the sealing ring pressure plate (8) and the lower annular flange (3d) forms the second groove cavity (3b).

3. The in-pipe jacking mechanism with improved sealing structure according to claim 2, characterized in that: The fixed sleeve (3) includes a vertically extending sleeve (3e) and a base plate (3f) horizontally connected to the bottom of the outer periphery of the sleeve (3e). The top of the sleeve (3e) and the end of the base plate (3f) are both connected to the inner wall of the pipe section (1). The upper annular flange (3c) and the lower annular flange (3d) are provided on the inner wall of the sleeve (3e). The sealing ring pressure plate (8) is detachably connected to the base plate (3f) by the first fastener (9).

4. The pipe jacking method of claim 3, wherein: The sealing ring pressure plate (8) includes a vertically extending annular support portion (8a) and a connecting plate (8b) horizontally connected to the bottom of the outer periphery of the annular support portion (8a); the top of the annular support portion (8a) is provided with a ring of support plate (8c) for abutting the bottom of the sealing ring; the connecting plate (8b) and the base plate (3f) are respectively provided with mounting holes (10) for the first fastener (9) to pass through.

5. The in-pipe jacking mechanism with improved sealing structure according to claim 3, characterized in that: The sleeve (3e) has an inlet (3g) on ​​its side wall that communicates with the first groove (3a); the outlet end of the grease injection tube (7) is sealed to the inlet (3g), and the inlet end of the grease injection tube (7) passes through the bottom plate (3f) and is exposed.

6. The in-pipe jacking mechanism with improved sealing structure according to claim 3, characterized in that: The inlet end of the grease injection tube (7) is connected to a grease injection nozzle (11), which is located at the bottom of the base plate (3f).

7. The in-pipe jacking mechanism with improved sealing structure according to claim 2, characterized in that: The top of the pre-embedded pipe (6) is detachably fitted with a cap (12) for sealing the opening of the pre-embedded pipe (6), and a third sealing ring (13) is provided between the cap (12) and the pre-embedded pipe (6).

8. The pipe jacking mechanism with improved sealing structure according to claim 7, characterized in that: The cover (12) has a water inlet channel (12a) that runs through its upper and lower ends to allow external water to enter the interior of the pre-buried pipe (6).

9. The in-line jacking mechanism of claim 7, wherein: The top of the pre-buried pipe (6) is provided with a one-way valve that can replace the cover (12). The one-way valve is configured to allow the water inside the pre-buried pipe (6) to flow unidirectionally to the river outside the pipe under the action of water pressure difference, and can block the water in the river from flowing back into the pre-buried pipe (6).

10. The pipe jacking mechanism with improved sealing structure according to any one of claims 1 to 9, characterized in that: The pre-embedded pipe (6) is configured in multiple ways. Each pre-embedded pipe (6) has a fastener mounting groove (6a) on its outer peripheral wall near its upper and lower ends. The upper and lower end faces of the pre-embedded pipe (6) are provided with through holes (6b) that penetrate to the fastener mounting groove (6a). The two adjacent embedded pipes (6) are detachably connected by fasteners installed in the fastener mounting groove (6a) and passing through the through hole (6b), and the connection part of the two adjacent embedded pipes (6) is filled with concrete to form a flat outer circumferential surface that is compatible with the first sealing ring (4) and the second sealing ring (5).

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