Novel intermediate jacking station device for multi-sealing jacking pipe

Abstract

The invention belongs to the technical field of intermediate jacking station devices, and mainly relates to a novel intermediate jacking station device for multiple sealing jacking pipes, which comprises an inner shell and an outer shell sleeved on the outer side of the inner shell, the inner shell and the outer shell are respectively used for connecting two adjacent jacking pipes, a driving piece is fixed in the inner shell, and a jacking part is arranged in the outer shell. The driving piece operates to enable the telescopic end of the driving piece to abut against the abutting portion of the outer shell, so that the outer shell and the inner shell relatively slide in the axial direction, and a sealing piece is arranged between the inner shell and the outer shell. In the relative sliding process of the inner shell and the outer shell, the sealing piece plays a key protection role and is installed at the gap between the inner shell and the outer shell, and the sealing piece can prevent external soil, water and other impurities from entering the space between the inner shell and the outer shell and prevent the external soil, water and other impurities from damaging internal parts such as the driving piece and affecting normal operation of the device.

Description

Technical Field

[0001] The present invention belongs to the technical field of relay chamber devices, and mainly relates to a new type of relay chamber device for multi - sealed pipe jacking. Background Art

[0002] Pipe jacking technology has completely solved the problems such as damage to urban buildings and traffic jams caused by pipeline laying construction, and highlights its advantages in stable soil layers and environmental protection. However, there are certain technical difficulties in long - distance pipe jacking construction. As the length of the construction pipeline increases, the friction force of the underground soil around the pipeline accumulates, and the required jacking force will also increase accordingly. If the jacking capacity of the main jack cylinders at the back is simply increased, the pipe body will be subjected to an increased jacking force, which is very likely to damage the pipeline or cause the pipe jacking construction to stagnate due to insufficient jacking force.

[0003] As an essential component in long - distance pipe jacking construction, the relay chamber plays a role in sectional jacking. The greatest advantage of using a relay chamber is that it can shorten the length and reduce the number of backup jacks in the working well. When it is difficult to jack the pipe body in one go due to its excessive length, it can be divided into two or more sections and jacked using the relay chamber method (generally, a length of 50 meters - 100 meters is one section), avoiding overloading the pipe body during jacking, reducing potential safety hazards, and ensuring the safety of the jacking operation construction. Currently, relay chambers are generally fabricated by steel welding. The welding quality and welding strength directly affect the safety of pipe jacking construction. At the same time, fabricating relay chambers by steel welding has a high cost. After the construction is completed, the mating surface is sealed by full - circle riveting and welding, and the sealing performance is poor. Summary of the Invention

[0004] The present invention provides a new type of relay chamber device for multi - sealed pipe jacking to solve the problem of poor sealing of the existing relay chamber device.

[0005] To solve the above problems, the present invention adopts the following technical solutions: A new type of relay chamber device for multi - sealed pipe jacking includes an inner shell and an outer shell sleeved outside the inner shell and capable of sliding relative to it. The inner shell and the outer shell are respectively used to connect two adjacent pipe jacks. A driving member is fixed inside the inner shell, and a jacking part is arranged inside the outer shell. The driving member operates so that its telescopic end jacks against the jacking part of the outer shell, causing axial relative sliding between the outer shell and the inner shell. A sealing member is arranged between the inner shell and the outer shell.

[0006] It has the following beneficial effects: The movement of the telescopic end of the driving member causes it to jack against the jacking part of the outer shell, thereby transmitting the power generated by the driving member to the outer shell. Under the action of this force, axial relative sliding can be achieved between the outer shell and the inner shell, which can simulate the displacement change during the pipe jacking process, transfer the jacking force from one pipe jack to another, and thus realize the continuous propulsion of the pipe jacking. During the relative sliding of the inner shell and the outer shell, the seal plays a crucial protective role. It is installed at the gap between the inner shell and the outer shell, forming an effective barrier. The seal can prevent external soil, water, and other impurities from entering the space between the inner shell and the outer shell. If these impurities enter, they may damage internal components such as the driving parts, affecting the normal operation of the device. At the same time, the seal can also prevent the possible medium leakage problem during the pipe jacking construction, ensuring the safety and cleanliness of the construction environment, and improving the reliability and service life of the device.

[0007] Furthermore, an annular groove is provided on the outer side of the end of the inner shell extending into the inner part of the outer shell, and the annular groove penetrates the end face of the end of the inner shell extending into the inner part of the outer shell. The seal includes an I1-type sealing ring and a combined ring, and the I1-type sealing ring and the combined ring are arranged in the annular groove in sequence. An annular support ring that slides coaxially is provided inside the outer shell, and the annular support ring presses against the combined ring to fix the I1-type sealing ring and the combined ring in the annular groove.

[0008] It has the following beneficial effects: The annular groove provides an installation space for the seal (I1-type sealing ring and combined ring), enabling the seal to be accurately installed on the inner shell, and this design of penetrating the end face helps to better achieve the sealing effect and prevent the medium from leaking from the end of the inner shell. The annular support ring plays a role in fixing and supporting the seal, ensuring the stable position of the seal in the annular groove and preventing the seal from shifting or loosening during use, thereby guaranteeing the reliability of the sealing effect.

[0009] Furthermore, the groove wall of the annular groove is a wedge surface, and the I1-type sealing ring is in wedge-shaped fit with the groove wall of the annular groove.

[0010] It has the following beneficial effects: This design of wedge-shaped fit enables the I1-type sealing ring to better fit the groove wall when under pressure, enhancing the sealing effect; when there is relative movement or external pressure between the inner shell and the outer shell, the I1-type sealing ring can be further squeezed and deformed under the action of the wedge surface, improving the sealing tightness and effectively preventing leakage.

[0011] Furthermore, a pressing bolt is provided on the annular support ring, and the pressing bolt presses against the pressing part of the outer shell.

[0012] It has the following beneficial effects: The function of the pressing bolt is to press against the pressing part of the outer shell through the annular support ring, enabling the annular support ring to be more firmly fixed inside the outer shell, thereby further ensuring the stable installation of the seal (I1-type sealing ring and combined ring), preventing the annular support ring from shifting during use, and guaranteeing the reliability of the sealing structure.

[0013] Further, the seal includes an I2-type rubber pad which is fixed inside the outer shell, and the end of the inner shell extending into the inner part of the outer shell presses against the I2-type rubber pad.

[0014] Further, an annular groove is provided on the side surface of the inner shell extending into the inner part of the outer shell; The seal further includes an A-type sealing ring which is arranged in the annular groove to seal the gap between the outer shell and the inner shell.

[0015] Further, a support portion is provided inside the inner shell, and the fixed end of the driving member presses against the support portion.

[0016] It has the following beneficial effects: The support portion provides stable support for the driving member, ensuring the stability of the driving member during operation, enabling the driving member to effectively transmit power to the outer shell, and also helping to disperse the force generated during the operation of the driving member, preventing the inner shell from being damaged due to uneven force.

[0017] Further, a first reinforcing rib is provided inside the outer shell, and the first reinforcing rib is provided between the pressing portion and the side wall of the outer shell; A second reinforcing rib is provided inside the inner shell, and the second reinforcing rib is provided between the support portion and the side wall of the inner shell.

[0018] It has the following beneficial effects: The first reinforcing rib enhances the structural strength of the outer shell, improves the stability of the outer shell when bearing the top thrust and external pressure, prevents the outer shell from deforming or being damaged, and ensures the reliability and service life of the device; The second reinforcing rib enhances the structural strength of the inner shell, especially near the support portion, can better bear the acting force of the driving member, prevent the inner shell from deforming or being damaged due to excessive force, and improves the stability and reliability of the inner shell.

[0019] Further, an oil injection port is provided inside the inner shell.

[0020] It has the following beneficial effects: The oil injection hole serves as an oil injection channel. After injecting grease through this oil injection channel, the friction of the seal contact surface is reduced, damage to the seal is prevented, and the sealing performance of the seal is improved.

[0021] Further, the outer shell and the inner shell are integrally formed by green short-process lost foam casting, and the materials of the outer shell and the inner shell are ductile iron; The surfaces of the outer shell and the inner shell are coated with an epoxy resin coating.

[0022] It has the following beneficial effects: The outer shell and the inner shell are integrally formed by green short-process lost foam casting. This casting process can ensure the overall structural accuracy and quality of the outer shell and the inner shell, reduce casting defects, and improve the reliability of the product. At the same time, the green short-process technology meets the environmental protection requirements and reduces environmental pollution during the production process. Ductile iron has high strength, toughness and wear resistance, and can withstand large pressures and impacts during the pipe jacking construction process, ensuring the reliability and service life of the device under harsh working conditions. The epoxy resin coating has good corrosion resistance, can effectively prevent the outer shell and the inner shell from being corroded by external media (such as soil, water, chemical substances, etc.), extend the service life of the device, and also helps to keep the appearance of the device clean and beautiful. Description of the Drawings

[0023] By referring to the following detailed description with reference to the drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is an axial sectional view of the relay room device in the first embodiment; Figure 2 It is a radial sectional view of the relay room device in the first embodiment; Figure 3 It is an axial sectional view of the relay room device in the second embodiment; Figure 4 It is a radial sectional view of the relay room device in the second embodiment.

[0024] Description of the Reference Numerals in the Drawings: 1. Inner shell; 2. Outer shell; 3. Driving member; 4. Jacking part; 5. Supporting part; 6. Annular support ring; 7. Type A sealing ring; 8. Type I1 sealing ring; 9. Combined ring; 10. Jacking bolt; 11. First reinforcing rib; 12. Second reinforcing rib; 13. Oil filling port; 14. Type I2 rubber pad; 15. Locking bolt. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Those skilled in the art should know that the following described embodiments are a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0026] The following specifically introduces various non - restrictive implementation manners of the present invention. The number of any element in the drawings is for illustration rather than limitation, and any naming is only for distinction without any restrictive meaning. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0027] Embodiment 1 As Figure 1 、 Figure 2 shown, a new type of relay chamber device for multi - sealed pipe jacking includes an inner shell 1 and an outer shell 2 sleeved outside the inner shell 1 and capable of sliding relatively. The inner shell 1 and the outer shell 2 are respectively used to connect two adjacent pipe jacks. A driving member 3 is fixed inside the inner shell 1, and a pressing portion 4 is arranged inside the outer shell 2. The driving member 3 operates to make its telescopic end press the pressing portion 4 of the outer shell 2, so that the outer shell 2 and the inner shell 1 slide axially relative to each other, and a sealing member is arranged between the inner shell 1 and the outer shell 2.

[0028] In this embodiment, the driving member 3 is a relay oil cylinder.

[0029] The inner shell 1 and the outer shell 2 are used to connect two adjacent pipe jacks, that is, the structure after the inner shell 1 and the outer shell 2 are connected is located between the two pipe jacks. They are important connecting components of the device, providing the basic structure for connecting the relay chamber device with the pipe jacks, ensuring the connection stability between the device and the pipe jacks, and enabling the relay chamber device to play a normal role in pipe jacking construction.

[0030] The outer shell 2 is sleeved outside the inner shell 1 and can slide relatively. It is also used to connect adjacent pipe jacks and cooperate with the inner shell 1 to achieve the axial relative sliding function. Through this sliding cooperation, the jacking force can be transmitted during pipe jacking construction to realize the propulsion of the pipe jack, and a certain displacement change can be adapted during the propulsion process.

[0031] When the driving member 3 fixed inside the inner shell 1 operates, its telescopic end presses the pressing portion 4 of the outer shell 2, making the outer shell 2 and the inner shell 1 slide axially relative to each other. The driving member 3 is the power source for realizing the relative sliding between the outer shell 2 and the inner shell 1. Through its telescopic action, the power can be effectively transmitted to the outer shell 2, thereby pushing the pipe jack forward, improving the power transmission efficiency and controllability of pipe jacking construction.

[0032] The pressing portion 4 is located inside the outer shell 2 and is the part pressed by the telescopic end of the driving member 3. It plays a role in receiving the jacking force of the driving member 3 and converting it into the force for the relative sliding between the outer shell 2 and the inner shell 1, ensuring the effective transmission of the force, enabling the outer shell 2 to slide relative to the inner shell 1 in the expected manner, and thus realizing the propulsion of the pipe jack.

[0033] A seal is provided between the inner shell 1 and the outer shell 2. Its function is to prevent impurities such as soil and water from the outside world from entering the gap between the inner shell 1 and the outer shell 2, avoiding damage to components such as the driving part 3 inside the device. At the same time, it also ensures the sealing performance of the device, prevents problems such as leakage during pipe jacking construction, and improves the reliability and service life of the device.

[0034] The inner shell 1 and the outer shell 2 are the basic structural components of the entire device. They are respectively connected to two adjacent pipe jacks, thus constructing a movable relay structure between the pipe jacks. This connection method enables the device to be integrated into the pipe jacking construction system and provides basic support for subsequent jacking operations.

[0035] The driving part 3 is fixed inside the inner shell 1 and is the power source for the device to achieve axial relative sliding. When the driving part 3 starts to operate, its telescopic end will move.

[0036] The jacking part 4 provided inside the outer shell 2 corresponds to the telescopic end of the driving part 3. The movement of the telescopic end of the driving part 3 causes it to jack against the jacking part 4 of the outer shell 2, and then transmits the power generated by the driving part 3 to the outer shell 2. Under the action of this force, axial relative sliding can be achieved between the outer shell 2 and the inner shell 1. This relative sliding is crucial for pipe jacking construction. It can simulate the displacement changes during pipe jacking propulsion, transfer the jacking force from one pipe jack to another, and thus achieve continuous propulsion of the pipe jack.

[0037] During the relative sliding process between the inner shell 1 and the outer shell 2, the seal plays a key protective role. It is installed at the gap between the inner shell 1 and the outer shell 2, forming an effective barrier.

[0038] The seal can prevent soil, water and other impurities from the outside world from entering the space between the inner shell 1 and the outer shell 2. If these impurities enter, they may damage internal components such as the driving part 3 and affect the normal operation of the device. At the same time, the seal can also prevent possible medium leakage problems during pipe jacking construction, ensure the safety and cleanliness of the construction environment, and improve the reliability and service life of the device.

[0039] In this embodiment, the outer shell 2 and the inner shell 1 are integrally formed by green short-process lost foam casting, and the materials of the outer shell 2 and the inner shell 1 are ductile iron.

[0040] The outer shell 2 and the inner shell 1 are integrally formed by green short-process lost foam casting. This casting process can ensure the overall structural accuracy and quality of the outer shell 2 and the inner shell 1, reduce casting defects, and improve the reliability of the product; at the same time, the green short-process meets environmental protection requirements and reduces environmental pollution during the production process.

[0041] Ductile iron has high strength, toughness and wear resistance, and can withstand large pressures and impact forces during the pipe jacking construction process, ensuring the reliability and service life of the device under harsh working conditions.

[0042] In this embodiment, the surfaces of the outer shell 2 and the inner shell 1 are coated with an epoxy resin coating. The epoxy resin coating has good corrosion resistance and can effectively prevent the outer shell 2 and the inner shell 1 from being corroded by external media (such as soil, water, chemical substances, etc.), extending the service life of the device. At the same time, it also helps to keep the appearance of the device clean and beautiful.

[0043] In this embodiment, the seal includes an A-type sealing ring 7, an I1-type sealing ring 8 and a combined ring 9. An annular groove is provided on the side of the inner shell 1 extending into the inner part of the outer shell 2. The A-type sealing ring 7 is arranged in the annular groove to seal the gap between the outer shell 2 and the inner shell 1. The annular groove provides an installation position for the A-type sealing ring 7, enabling the A-type sealing ring 7 to be accurately installed on the inner shell 1 and playing a role in sealing the gap between the outer shell 2 and the inner shell 1. The A-type sealing ring 7 arranged in the annular groove can effectively seal the gap between the outer shell 2 and the inner shell 1, further improving the sealing performance of the device. The A-type sealing ring 7 has good elasticity and sealing performance and can maintain the sealing effect under different working conditions, preventing external media from entering the gap between the inner shell 1 and the outer shell 2.

[0044] In this embodiment, an annular groove is provided on the outer side of the end of the inner shell 1 extending into the inner part of the outer shell 2, and the annular groove penetrates the end face of the end of the inner shell 1 extending into the inner part of the outer shell 2. The I1-type sealing ring 8 and the combined ring 9 are arranged in the annular groove in sequence. An annular support ring 6 that slides coaxially is provided inside the outer shell 2, and the annular support ring 6 presses against the combined ring 9 to fix the I1-type sealing ring 8 and the combined ring 9 in the annular groove.

[0045] In this embodiment, the annular groove provides an installation space for the seals (I1-type sealing ring 8 and combined ring 9), enabling the seals to be accurately installed on the inner shell 1, and this design of penetrating the end face helps to better achieve the sealing effect and prevent the medium from leaking from the end of the inner shell 1.

[0046] In this embodiment, the I1-type sealing ring 8 and the combined ring 9 are arranged in the annular groove in sequence and are important components of the sealing structure. The I1-type sealing ring 8 can form an effective seal in the annular groove, preventing external impurities from entering the gap between the inner shell 1 and the outer shell 2. At the same time, to a certain extent, it can adapt to the relative movement between the inner shell 1 and the outer shell 2, ensuring the reliability of the seal.

[0047] In this embodiment, the combined ring 9 and the I1-type sealing ring 8 are arranged in the annular groove in cooperation, further enhancing the sealing effect. The combined ring 9 is usually composed of multiple materials and has good elasticity and wear resistance. It can work together with the I1-type sealing ring 8 to improve the stability and durability of the seal.

[0048] If the A-type sealing ring 7 fails due to repeated friction during the construction process, the internal sealing structure of the I1-type sealing ring 8 is used for secondary sealing repair to ensure the tightness of the interface and the safety and durability of the pipeline network operation.

[0049] In this embodiment, the annular support ring 6 plays a role in fixing and supporting the seal, ensuring the stable position of the seal in the annular groove, preventing the seal from shifting or loosening during use, and thus ensuring the reliability of the sealing effect.

[0050] Specifically, the groove wall of the annular groove is a wedge surface, and the I1-type sealing ring 8 is in wedge-shaped fit with the groove wall of the annular groove. This wedge-shaped fit design enables the I1-type sealing ring 8 to better fit the groove wall when under pressure, enhancing the sealing effect. When there is relative movement between the inner shell 1 and the outer shell 2 or external pressure is applied, the I1-type sealing ring 8 can be further squeezed and deformed under the action of the wedge surface, improving the tightness of the seal and effectively preventing leakage.

[0051] In this embodiment, a pressing bolt 10 is provided on the annular support ring 6, and the pressing bolt 10 presses the pressing portion 4 of the outer shell 2. The function of the pressing bolt 10 is to firmly fix the annular support ring 6 in the outer shell 2 by pressing the pressing portion 4 of the outer shell 2, thereby further ensuring the stable installation of the seals (I1-type sealing ring 8 and combined ring 9), preventing the annular support ring 6 from shifting during use, and ensuring the reliability of the sealing structure.

[0052] In this embodiment, the support portion 5 provides stable support for the driving member 3, ensuring the stability of the driving member 3 during operation, enabling the driving member 3 to effectively transmit power to the outer shell 2, and also helping to disperse the force generated during the operation of the driving member 3, preventing the inner shell 1 from being damaged due to uneven force.

[0053] In this embodiment, a first reinforcing rib 11 is provided inside the outer shell 2, and the first reinforcing rib 11 is provided between the pressing portion 4 and the side wall of the outer shell 2. A second reinforcing rib 12 is provided inside the inner shell 1, and the second reinforcing rib 12 is provided between the support portion 5 and the side wall of the inner shell 1.

[0054] The first reinforcing rib 11 enhances the structural strength of the outer shell 2, improves the stability of the outer shell 2 when bearing the top thrust and external pressure, prevents the outer shell 2 from deforming or being damaged, and ensures the reliability and service life of the device. The second reinforcing rib 12 enhances the structural strength of the inner shell 1, especially near the support portion 5, can better bear the acting force of the driving member 3, prevents the inner shell 1 from deforming or being damaged due to excessive force, and improves the stability and reliability of the inner shell 1.

[0055] In this embodiment, an oil injection port 13 is provided inside the inner shell 1. The oil injection hole is an oil injection channel. After injecting grease through this oil injection channel, the friction of the seal contact surface is reduced, damage to the seal is prevented, and the sealing performance of the seal is improved.

[0056] The working process of the present invention is as follows: When the thrust of the main jacking cylinder of the working shaft for pipe jacking construction is insufficient or it is difficult to jack due to complex geological conditions, the relay cylinder, a component inside the relay chamber, is started. The relay cylinder makes repeated telescopic movements inside the relay chamber to push the pipe jacking forward, realizing the function of sectional pipe jacking.

[0057] Embodiment 2 The difference between this embodiment and Embodiment 1 is that, as Figure 3 、 Figure 4 shown, in this embodiment, the seal includes an A-type sealing ring 7 and an I2-type rubber pad 14, that is, the I1-type sealing ring 8 and the combined ring 9 are replaced with the I2-type rubber pad 14.

[0058] The I2-type rubber pad 14 is fixed inside the outer shell 2 by a locking bolt 15, and the end of the inner shell 1 extending into the outer shell 2 presses against the I2-type rubber pad 14. The I2-type rubber pad 14 plays an auxiliary sealing role. When the inner shell 1 and the outer shell 2 slide relative to each other, the end of the inner shell 1 presses against the I2-type rubber pad 14, causing it to undergo elastic deformation to fill the gap between the inner shell 1 and the outer shell 2, further enhancing the sealing effect and preventing external impurities from entering the device.

[0059] If the A-type sealing ring 7 fails due to repeated friction during construction, the internal sealing structure of the I2-type rubber pad 14 is used for secondary sealing remedy to ensure the tightness of the interface and the safety and durability of the pipeline network operation.

Claims

1. A new type of multi-seal relay room device for jacking pipes, characterized in that: It includes an inner shell and an outer shell which is sleeved on the outer side of the inner shell and can slide relatively. The inner shell and the outer shell are respectively used to connect two adjacent jacking pipes. A driving member is fixed in the inner shell, and a pressing part is provided in the outer shell. The driving member is operated so that its telescopic end presses the pressing part of the outer shell, so that the outer shell and the inner shell slide axially relative to each other. A sealing member is provided between the inner shell and the outer shell.

2. A novel multi-seal relay room device for jacking pipes according to claim 1, characterized in that: An annular groove is provided on the outer side of the end of the inner shell extending into the inner part of the outer shell, and the annular groove passes through the end surface of the inner shell extending into the inner part of the outer shell; The sealing element comprises an I1-type sealing ring and a combination ring, and the I1-type sealing ring and the combination ring are arranged in sequence in the annular groove; A coaxially sliding annular support ring is arranged inside the shell, and the annular support ring presses the combination ring to fix the I1 type sealing ring and the combination ring in the annular groove.

3. A novel multi-seal relay room device for jacking pipes according to claim 2, characterized in that: The groove wall of the annular groove is a wedge surface, and the I1-type sealing ring is wedge-matched with the groove wall of the annular groove.

4. A novel multi-seal relay room device for jacking pipes according to claim 3, characterized in that: The annular support ring is provided with a pressing bolt, and the pressing bolt presses the pressing part of the shell.

5. A novel multi-seal pipe jacking relay device according to claim 1, characterized in that: The sealing element comprises an I2-type rubber pad, which is fixed inside the outer shell, and the end of the inner shell extending into the inner shell presses the I2-type rubber pad.

6. A novel multi-seal relay room device for jacking pipes according to any one of claims 2 to 5, characterized in that: An annular groove is provided on the side of the inner shell extending into the inner part of the outer shell; The sealing member further comprises an A-type sealing ring, which is arranged in the annular groove to seal the gap between the outer shell and the inner shell.

7. A novel multi-seal relay room device for jacking pipes according to claim 6, characterized in that: A support portion is provided inside the inner shell, and the fixed end of the driving member is pressed against the support portion.

8. A novel multi-seal relay room device for jacking pipes according to claim 7, characterized in that: A first reinforcing rib is provided inside the shell, and the first reinforcing rib is provided between the pressing portion and the side wall of the shell; A second reinforcing rib is disposed inside the inner shell, and the second reinforcing rib is disposed between the supporting portion and the side wall of the inner shell.

9. A novel multi-seal relay room device for jacking pipes according to claim 8, characterized in that: An oil filling port is arranged inside the inner shell.

10. A novel multi-seal relay room device for jacking pipes according to claim 1, characterized in that: The outer shell and the inner shell are integrally formed by green short-process lost foam casting, and the material of the outer shell and the inner shell is ductile iron; The surfaces of the outer shell and the inner shell are coated with epoxy resin coating.

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