Connection structure of dual-mode tunnel boring machine main engine and main jacking device and construction method thereof

Abstract

The present invention relates to a connection structure between a dual-mode tunnel boring machine mainframe and a main jacking device and a construction method thereof, comprising: a shell having one end fixed to the tunnel boring machine mainframe, an opening connected to a accommodating space formed at one end of the shell near the tunnel boring machine mainframe; a ring plate arranged in a T-shape with the shell and welded and fixed to the shell; and a plurality of telescopic rods fixed at intervals at the rear end of the tunnel boring machine mainframe and adjustable in length, the telescopic rods extending from the opening and abutting against the ring plate; by extending the telescopic rods, the telescopic rods abut between the ring plate and the rear end of the tunnel boring machine mainframe. The present invention solves the problem of jacking force transmission when a dual-mode tunnel boring machine switches from a shield mode to a jacking mode. The main jacking device and the tunnel boring machine mainframe are connected by a connection structure, so that the shield construction function and the jacking construction function are integrated into one, and the reliability of the connection part is enhanced, safety hazards are reduced, and construction efficiency and quality are improved.

Description

Technical Field

[0001] The present invention relates to the field of tunnel construction, and in particular to a connection structure between a dual-mode tunnel boring machine mainframe and a main jacking device and a construction method thereof. Background Art

[0002] In urban tunnel construction, commonly used tunnel boring machines are divided into shield tunnel boring machines and pipe jacking machines. Shield tunnel boring machines are suitable for long-distance, multi-curvature tunnel construction. They are expensive and have complex functions. They are generally used in highway cross-river tunnels, subway section tunnels, etc.; pipe jacking machines are used for short-distance (<200m), straight tunnel construction. They are low-cost and have relatively simple functions.

[0003] To leverage the advantages of both a pipe jacking machine and a shield machine, a dual-mode shield and pipe jacking tunnel boring machine (TBM) was developed. Considering the different propulsion principles of shield and pipe jacking, a shield machine uses a propulsion cylinder to push against the front end of the pipe segments to advance. A pipe jacking machine utilizes a main jacking mechanism to push the pipe segments forward. Therefore, when the dual-mode TBM switches from shield mode to pipe jacking mode, a suitable connection structure is required to withstand the jacking force of the main jacking mechanism and transmit this force forward. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a connection structure and construction method of a dual-mode tunnel boring machine main body and a main jacking device, which solves the problem of forward transmission of the jacking force when the dual-mode tunnel boring machine switches from shield mode to jacking mode. The main jacking device and the tunnel boring machine main body are connected by a connection structure, so that the jacking force from the main jacking device can be transmitted forward, and the reliability of the connection part is enhanced, safety hazards are reduced, and construction efficiency and construction quality are improved. It is an important component of a shield-jacking dual-mode tunnel boring machine.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a connection structure between a dual-mode tunnel boring machine mainframe and a main jacking device. The tunnel boring machine mainframe is opposite to the excavation surface. The main jacking device is coaxially arranged with the tunnel boring machine mainframe and is located on the side of the tunnel boring machine mainframe away from the excavation surface. A plurality of pipe joints are formed between the main jacking device and the tunnel boring machine mainframe. The connection structure includes:

[0007] One end of the housing is fixed to the main engine of the tunnel boring machine, the interior of the housing is hollow to form an accommodating space, and an opening communicating with the accommodating space is formed at one end of the housing close to the main engine of the tunnel boring machine;

[0008] a ring plate arranged in a T-shape with the shell and welded to the shell, the inner diameter of the ring plate being the same as the inner diameter of the pipe segment, and the end of the ring plate away from the shell being in contact with the pipe segment; and

[0009] A plurality of telescopic rods are fixed at intervals at the rear end of the tunnel boring machine main body and are adjustable in length. The telescopic rods are arranged in a direction parallel to the axis of the tunnel boring machine main body. The telescopic rods extend from the opening and abut against the ring plate.

[0010] A plurality of ribs fixedly arranged at intervals in the accommodating space, wherein the ribs are staggered with the telescopic rod;

[0011] By extending the telescopic rod so that it can be pressed between the ring plate and the tail end of the tunnel boring machine main body, the jacking force of the main jacking device is transmitted forward along the telescopic rod to the tunnel boring machine main body, thereby avoiding bending and deformation of the connecting weld between the shell and the tunnel boring machine main body.

[0012] The present invention provides a connection structure between a dual-mode tunnel boring machine main body and a main jacking device. By utilizing a telescopic rod to push against the ring plate of the connection structure and the corresponding end of the tunnel boring machine main body, the stress caused to the connection between the shell of the connection structure and the tunnel boring machine main body when the main jacking device pushes the pipe segment is offset, thereby solving the problem that the connection between the tunnel boring machine main body and the main jacking device is prone to instability and fracture. The main jacking device and the tunnel boring machine main body are connected by the connection structure, so that the shield construction function and the jacking pipe construction function are integrated into one, and the reliability of the connection part is enhanced, the safety hazards are reduced, and the construction efficiency and construction quality are improved.

[0013] A further improvement of the connection structure between the main body of the dual-mode tunnel boring machine and the main jacking device of the present invention is that it also includes a through hole corresponding to the pipe section and opened in the shell, and a detachable rod corresponding to the through hole and installed in the accommodating space. The length of the detachable rod is adjustable. By extending the detachable rod, the detachable rod extends outward from the through hole and pushes against the pipe section, thereby separating the ring plate and the pipe section.

[0014] A further improvement of the connection structure between the dual-mode tunnel boring machine main unit and the main jacking device of the present invention is that it also includes a groove formed at the end of the pipe section and a receiving plate corresponding to the groove and formed on the shell. The receiving plate is inserted into the groove to connect the shell to the pipe section.

[0015] A further improvement of the connection structure between the dual-mode tunnel boring machine main unit and the main jacking device of the present invention is that the groove is opened on the outer wall of the pipe segment, and the surface of the receiving plate is flush with the outer wall of the shell and the outer wall of the pipe segment.

[0016] A further improvement of the connection structure between the main engine and the main jacking device of the dual-mode roadheader of the present invention is that the telescopic rod is a hydraulic telescopic rod including an oil cylinder, a piston slidably mounted on the oil cylinder, and a piston rod fixed to one side of the piston and partially extending out of the oil cylinder;

[0017] The connection structure also includes an oil tank connected to the oil cylinder and containing liquid, and a reversing valve connected between the oil tank and the oil cylinder. The reversing valve controls the liquid in the oil tank to flow into the oil cylinder from the side of the piston away from or close to the piston rod, so as to push the piston and drive the piston rod to extend or retract into the cylinder.

[0018] A further improvement of the connection structure between the dual-mode roadheader main machine and the main jacking device of the present invention is that it also includes a balancing valve connected between the reversing valve and the oil cylinder.

[0019] A further improvement to the connection structure between the dual-mode tunnel boring machine main unit and the main jacking device of the present invention is that it also includes a hydraulic pump connected between the oil tank and the reversing valve for pressurizing the liquid, and a proportional relief valve connected between the hydraulic pump and the reversing valve. The pressure of the pressurized liquid is controlled by the proportional relief valve so that the pressure of the liquid is less than or equal to a set threshold.

[0020] A further improvement of the connection structure between the dual-mode tunnel boring machine main unit and the main jacking device of the present invention is that the threshold value is set to 2 MPa.

[0021] The present invention provides a construction method for a connection structure between a dual-mode tunnel boring machine mainframe and a main jacking device, comprising the following steps:

[0022] Provide a housing and a plurality of telescopic rods, install the telescopic rods in the housing, fix one end of the housing to the main body of the tunnel boring machine and fit the other end to the pipe joint, so that the plurality of telescopic rods are arranged along an axial direction parallel to the main body of the tunnel boring machine;

[0023] Extend several telescopic rods so that they are pressed against the ring plate and the tail end of the tunnel boring machine main body. The jacking force of the main jacking device can be transmitted forward along the telescopic rods to the tunnel boring machine main body, thereby avoiding bending and deformation of the connecting weld between the shell and the tunnel boring machine main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the connection structure between the main engine and the main jacking device of the dual-mode roadheader of the present invention in use;

[0025] Figure 2 for Figure 1 A stereogram of part A;

[0026] Figure 3 for Figure 1 a side cross-sectional view of section A, wherein the telescopic rod is omitted;

[0027] Figure 4 This is a schematic diagram of the control assembly of the telescopic rod part in the connection structure between the main machine and the main jacking device of the dual-mode tunnel boring machine of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] See Figure 1 The present invention provides a connection structure between a dual-mode tunnel boring machine mainframe and a main jacking device and a construction method thereof. By utilizing a telescopic rod to push against the ring plate of the connection structure and the corresponding end of the tunnel boring machine mainframe, the stress caused to the connection between the shell of the connection structure and the tunnel boring machine mainframe when the main jacking device pushes the pipe segment is offset, thereby solving the problem that the connection structure between the tunnel boring machine mainframe and the main jacking device is prone to instability and fracture. The main jacking device and the tunnel boring machine mainframe are connected by the connection structure, so that the shield construction function and the jacking pipe construction function are integrated into one, and the reliability of the connection part is enhanced, the safety hazard is reduced, and the construction efficiency and construction quality are improved. The connection structure between the dual-mode tunnel boring machine mainframe and the main jacking device of the present invention is described below with reference to the accompanying drawings.

[0030] See Figure 1 , Figure 1 This is a schematic diagram of the connection structure of the dual-mode tunnel boring machine main unit and the main jacking device in use; Figure 1 , the connection structure between the dual-mode tunnel boring machine main unit and the main jacking device of the present invention is described.

[0031] like Figure 1 As shown in the figure, the connection structure of the dual-mode roadheader mainframe and the main jacking device of the present invention is as follows: the roadheader mainframe 21 is opposite to the excavation surface, the main jacking device 22 is coaxially arranged with the roadheader mainframe 21 and is located on the side of the roadheader mainframe 21 away from the excavation surface, and a plurality of pipe sections 23 are formed between the main jacking device 22 and the roadheader mainframe 21. The connection structure includes:

[0032] One end of the housing 11 is fixed to the main engine 21 of the tunnel boring machine. The interior of the housing 11 is hollow to form an accommodating space. An opening communicating with the accommodating space is formed at one end of the housing close to the main engine 21 of the tunnel boring machine.

[0033] A ring plate 112 is arranged in a T-shape with the housing 11 and is welded to the housing 11. The inner diameter of the ring plate 112 is the same as the inner diameter of the pipe segment 23. The end of the ring plate 112 away from the housing 11 is attached to the pipe segment 23; and

[0034] A plurality of telescopic rods 12 are fixedly mounted at intervals on the rear end of the tunnel boring machine main body and are adjustable in length. The telescopic rods 12 are arranged parallel to the axis of the tunnel boring machine main body 21. The telescopic rods 12 extend from the opening and abut against the ring plate 112.

[0035] By extending the telescopic rod 12 so that the telescopic rod 12 is pressed between the corresponding ends of the ring plate 112 and the tunnel boring machine main body 21, the jacking force of the main jacking device 22 can be transmitted forward along the telescopic rod 12 to the tunnel boring machine main body 21, thereby avoiding bending and deformation of the connecting weld between the shell 11 and the tunnel boring machine main body 21.

[0036] Specifically, it also includes a plurality of ribs 13 fixedly arranged at intervals in the accommodating space. The ribs 13 and the telescopic rods 12 are staggered to enhance the connection strength between the housing 11 and the ring plate 112 .

[0037] As a preferred embodiment of the present invention, it also includes a through hole corresponding to the pipe joint 23 and opened in the ring plate 112, and a detachable rod corresponding to the through hole and installed in the accommodating space. The length of the detachable rod is adjustable. By extending the detachable rod, the detachable rod extends outward from the through hole and pushes against the pipe joint 23, thereby separating the ring plate 112 and the pipe joint 23.

[0038] Specific, combined Figure 2 and Figure 3 As shown, it also includes a groove formed at the end of the pipe section 23 and a receiving plate 111 corresponding to the groove and formed on the shell 11. The receiving plate 111 is inserted into the groove to connect the shell 11 to the pipe section 23, thereby preventing external water and soil from entering the pipe section 23.

[0039] Preferably, the groove is formed on the outer wall of the pipe joint 23, and the surface of the receiving plate is flush with the outer wall of the shell and the outer wall of the pipe joint.

[0040] Furthermore, the telescopic rod 12 is a hydraulic telescopic rod including an oil cylinder, a piston slidably mounted on the oil cylinder, and a piston rod fixed to one side of the piston and partially extending out of the oil cylinder;

[0041] The connection structure also includes an oil tank 14 connected to the oil cylinder and containing liquid, and a reversing valve 15 connected between the oil tank 14 and the oil cylinder. The reversing valve 15 controls the liquid in the oil tank 14 to flow into the oil cylinder from the side of the piston away from or close to the piston rod, so as to push the piston and drive the piston rod to extend or retract into the oil cylinder.

[0042] Preferably, a balancing valve 16 connected between the reversing valve 15 and the oil cylinder is further included.

[0043] Specifically, it also includes a hydraulic pump 17 connected between the oil tank 14 and the reversing valve 15 for pressurizing the liquid, and a proportional relief valve 18 connected between the hydraulic pump 17 and the reversing valve 15. The pressure of the pressurized liquid is controlled by the proportional relief valve 18 so that the pressure of the liquid is less than or equal to a set threshold, thereby preventing the telescopic rod 12 from exerting excessive pushing force on the shell 11 and the tunnel boring machine main body 21 and damaging the connection between the shell 11 and the tunnel boring machine main body 21.

[0044] Preferably, the threshold is set to 2 MPa.

[0045] The specific implementation method of the present invention is as follows:

[0046] The housing 11 is fixed to the end of the tunnel boring machine main body 21 near the main jacking device 22 by welding, and the receiving plate 111 is inserted into the groove of the pipe segment 23 to prevent external water and soil from entering the pipe segment 23;

[0047] Combine Figure 4 As shown, the liquid in the oil tank 14 is pressurized by the hydraulic pump 17, and then the liquid enters the oil cylinder on the side of the piston away from the piston rod from the left balance valve 16 through the reversing valve 15, causing the piston rod to extend outward, thereby lengthening the telescopic rod 12 and pressing against the ring plate 112 and the corresponding ends of the roadheader main body 21. At this time, the liquid on the side of the piston close to the piston rod in the oil cylinder flows back to the oil tank 14 through the right balance valve 16. The maximum pressure of the proportional relief valve 18 at the outlet of the hydraulic pump 17 can be set to 2MPa to prevent the top force of the telescopic rod 12 from being too large, which may cause the weld connecting the shell 11 and the roadheader main body 21 to be stretched and bent;

[0048] When the reversing valve 15 is de-energized and in the middle position, ports A and B of the reversing valve 15 outlet are connected to port T. The balancing valve 16 cannot be opened at this time due to the lack of control pressure, locking the oil circuits of the two chambers of the oil cylinder, so that the telescopic rod 12 is pressed against the ring plate 112 and the tunnel boring machine mainframe 21 and is in a locked and pressure-retaining state. At this time, the main jacking device 22 exerts a pushing force on the pipe joint 23 and the ring plate 112. Since the ring plate 112 and the tunnel boring machine mainframe 21 are supported by the telescopic rod 12, the pushing force of the main jacking device 22 can be transmitted forward along the telescopic rod 12 to the tunnel boring machine mainframe 21, thereby preventing the connecting weld between the shell 11 and the tunnel boring machine mainframe 21 from bending and deformation.

[0049] When the construction is completed, the detachment rod can be extended so that the detachment rod extends from the through hole and pushes the pipe segment 23, thereby separating the pipe segment 23 and the ring plate 112, so that the receiving plate 111 can be detached from the groove, and the tunnel boring machine main body 21 is separated from the pipe segment 23.

[0050] The present invention also provides a construction method for a connection structure between a dual-mode tunnel boring machine mainframe and a main jacking device, the method comprising the following steps:

[0051] Provide a housing 11 and a plurality of telescopic rods 12. Install the telescopic rods 12 in the housing 11. Fix one end of the housing 11 to the tunnel boring machine main body 21 and attach the other end to the pipe joint 23, so that the telescopic rods 12 are arranged parallel to the axis of the tunnel boring machine main body 21.

[0052] Extend several telescopic rods 12 so that the telescopic rods 12 are pressed between the corresponding ends of the ring plate 112 and the tunnel boring machine main body 21. The jacking force of the main jacking device 22 can be transmitted forward along the telescopic rods 12 to the tunnel boring machine main body 21, thereby avoiding bending and deformation of the connecting welds between the shell 11 and the tunnel boring machine main body 21.

[0053] The specific operation mode of the actual implementation of the construction method provided by the present invention is as follows:

[0054] The housing 11 is fixed to the end of the tunnel boring machine main body 21 near the main jacking device 22 by welding, and the receiving plate 111 is inserted into the groove of the pipe segment 23 to prevent external water and soil from entering the pipe segment 23;

[0055] The hydraulic pump 17 pressurizes the liquid in the oil tank 14, and then the liquid enters the oil cylinder on the side of the piston away from the piston rod through the reversing valve 15 and the left balancing valve 16, causing the piston rod to extend outward, thereby lengthening the telescopic rod 12 and pressing against the corresponding ends of the ring plate 112 and the roadheader main body 21. At this time, the liquid on the side of the piston close to the piston rod in the oil cylinder flows back to the oil tank 14 through the right balancing valve 16. The maximum pressure of the proportional relief valve 18 at the outlet of the hydraulic pump 17 can be set to 2MPa to prevent the push force of the telescopic rod 12 from being too strong, which may cause the weld connecting the shell 11 and the roadheader main body 21 to be stretched and deformed.

[0056] When the reversing valve 15 is de-energized and in the middle position, ports A and B of the reversing valve 15 outlet are connected to port T. The balancing valve 16 cannot be opened at this time due to the lack of control pressure, locking the oil circuits of the two chambers of the oil cylinder, so that the telescopic rod 12 is pressed against the shell 11 and the tunnel boring machine mainframe 21 and is in a locked and pressure-retaining state. At this time, the main jacking device 22 exerts a pushing force on the pipe section 23 and the ring plate 112. Since the ring plate 112 and the tunnel boring machine mainframe 21 are supported by the telescopic rod 12, the pushing force of the main jacking device 22 can be transmitted forward along the telescopic rod 12 to the tunnel boring machine mainframe 21, thereby preventing the connecting weld between the shell 11 and the tunnel boring machine mainframe 21 from bending and deformation.

[0057] When the construction is completed, the detachment rod can be extended so that the detachment rod extends from the through hole and pushes the pipe segment 23, thereby separating the pipe segment 23 and the ring plate 112, so that the receiving plate 111 can be detached from the groove, and the tunnel boring machine main body 21 is separated from the pipe segment 23.

[0058] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A connection structure between a dual-mode tunnel boring machine main engine and a main jacking device, characterized in that: The main body of the tunnel boring machine is opposite to the excavation surface. The main jacking device is coaxially arranged with the main body of the tunnel boring machine and is located on the side of the main body of the tunnel boring machine away from the excavation surface. A plurality of pipe joints are formed between the main jacking device and the main body of the tunnel boring machine. The connection structure includes: One end of the housing is fixed to the main engine of the tunnel boring machine, the interior of the housing is hollow to form an accommodating space, and the end of the housing close to the main engine of the tunnel boring machine is formed with an opening connected to the accommodating space; a ring plate arranged in a T-shape with the shell and welded to the shell, the inner diameter of the ring plate being the same as the inner diameter of the pipe segment, and the end of the ring plate away from the shell being in contact with the pipe segment; and A plurality of telescopic rods fixed at intervals on the rear end of the tunnel boring machine main body and having adjustable lengths, the telescopic rods being arranged in a direction parallel to the axis of the tunnel boring machine main body, the telescopic rods extending from the rear end of the main body and abutting against the ring plate; A plurality of ribs fixedly arranged at intervals in the accommodating space, wherein the ribs are staggered with the telescopic rod; By extending the telescopic rod so that the telescopic rod abuts between the ring plate and the tail end of the tunnel boring machine main body, the jacking force of the main jacking device is transmitted forward along the telescopic rod to the tunnel boring machine main body.

2. The connection structure between the dual-mode tunnel boring machine main unit and the main jacking device according to claim 1, characterized in that: It also includes a through hole corresponding to the pipe section and opened on the ring plate, and a detachable rod corresponding to the through hole and installed in the accommodating space. The length of the detachable rod is adjustable. By extending the detachable rod, the detachable rod extends outward from the through hole and pushes against the pipe section, thereby separating the ring plate and the pipe section.

3. The connection structure between the dual-mode tunnel boring machine main unit and the main jacking device according to claim 1, characterized in that: It also includes a groove formed at the end of the pipe section and a receiving plate corresponding to the groove and formed on the shell. The receiving plate is inserted into the groove to keep the shell and the pipe section in a fixed radial position.

4. The connection structure between the dual-mode tunnel boring machine main unit and the main jacking device according to claim 3, characterized in that: The groove is formed on the outer side wall of the pipe joint, and the surface of the receiving plate is flush with the outer side wall of the shell and the outer side wall of the pipe joint.

5. The connection structure between the dual-mode tunnel boring machine main unit and the main jacking device according to claim 1, characterized in that: The telescopic rod is a hydraulic telescopic rod, comprising an oil cylinder, a piston slidably mounted on the oil cylinder, and a piston rod fixed to one side of the piston and partially extending out of the oil cylinder; The connection structure also includes an oil tank connected to the oil cylinder and containing liquid, and a reversing valve connected between the oil tank and the oil cylinder. The reversing valve controls the liquid in the oil tank to flow into the oil cylinder from the side of the piston away from or close to the piston rod, so as to push the piston and drive the piston rod to extend or retract into the oil cylinder.

6. The connection structure between the dual-mode tunnel boring machine main unit and the main jacking device according to claim 5, characterized in that: It also includes a balancing valve connected between the reversing valve and the oil cylinder.

7. The connection structure between the dual-mode tunnel boring machine main unit and the main jacking device according to claim 5, characterized in that: It also includes a hydraulic pump connected between the oil tank and the reversing valve for pressurizing the liquid, and a proportional relief valve connected between the hydraulic pump and the reversing valve. The pressure of the pressurized liquid is controlled by the proportional relief valve so that the pressure of the liquid is less than or equal to a set threshold.

8. The connection structure between the dual-mode tunnel boring machine main unit and the main jacking device according to claim 7, characterized in that: The set threshold is 2 MPa.

9. A construction method for the connection structure between the dual-mode tunnel boring machine mainframe and the main jacking device according to claim 1, characterized in that: The steps include: Providing the housing and the plurality of telescopic rods, installing the telescopic rods in the housing, fixing one end of the housing to the tunnel boring machine main body and affixing the other end to the ring plate, so that the plurality of telescopic rods are arranged along an axial direction parallel to the tunnel boring machine main body; The telescopic rods are extended so that the telescopic rods abut between the ring plate and the tail end of the tunnel boring machine main body, so that the jacking force of the main jacking device is transmitted forward along the telescopic rods to the tunnel boring machine main body.

Images