A blind area excavation device for a rectangular pipe jacking machine

Abstract

The present invention provides a blind area excavation device for a rectangular pipe jacking machine, which solves the problems that the blind area cannot be synchronously excavated during the excavation process of the rectangular pipe jacking machine, there will be blind area residues, and the excavation surface is uneven after the blind area is excavated, and the blind area soil layer in the area with strong viscosity cannot be effectively crushed and removed; the present invention includes a tunneling machine shell body and a number of tunneling machine breaking discs connected by a chain transmission mechanism. At the four corners of the front end of the tunneling machine body, driving sprockets rotatably connected to the tunneling machine body are arranged. The four driving sprockets are symmetrically distributed in a rectangle. A driving chain is wound around the driving sprockets. The rear end of the driving chain is in contact with the front end of the tunneling machine shell body. The front end of the driving chain is fixedly connected with a belt strip. The front end of the belt strip is fixedly connected with a number of uniformly distributed cutting knives. One side of the cutting knife close to the driving sprocket is inclined, and the other side of the cutting knife far from the driving sprocket is in contact with the outer wall of the tunneling machine shell body; the structure of the present invention is delicate and has strong practicability.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel boring machine equipment, in particular to a blind area excavation device for a rectangular pipe jacking tunnel boring machine. Background Art

[0002] With the rapid development of social production and urbanization, the demand and requirements for underground space construction are increasing. Because rectangular pipe jacking is more adaptable to shallow overburden than circular pipe jacking, it can significantly reduce the slope and depth of various structures underpassed. Furthermore, rectangular structures can fully utilize the structural cross-section, improving cross-sectional utilization. As a green and environmentally friendly trenchless technology, rectangular pipe jacking plays a very important role in underground space construction.

[0003] Due to the rectangular excavation cross-section, rectangular pipe jacking machines (TPJs) have blind spots. Currently, most construction methods use multiple cutterheads, resulting in large and widespread blind spots. This not only increases the difficulty of tunneling, but also significantly increases the pressure on the cutterhead surface, increasing the material consumption of the casing.

[0004] Existing technologies generally change the structural arrangement of the cutterhead and housing, designing the cross-section into a non-standard rectangular cross-section, increasing the radius of the fillet at the right angles, and designing the rectangular edges into an elliptical structure, thereby increasing the diameter of a single cutterhead and reducing the blind spot range. Alternatively, blades are installed on the housing near the blind spot to remove the remaining soil layer in the blind spot. However, due to the large location of the blind spot, the removal process is incomplete and the soil layer is uneven, requiring subsequent leveling and repair. At the same time, due to the high viscosity of the soil in some areas, the soil layer in the blind spot falls off in pieces, causing impact on the cutterhead and making it difficult to transport it to the outside world.

[0005] Therefore, the present invention provides a blind area excavation device for a rectangular pipe jacking machine to solve the above problems. Summary of the Invention

[0006] In view of the above situation, in order to overcome the defects of the existing technology, the present invention provides a blind spot excavation device for a rectangular jacking tunnel boring machine, which effectively solves the problems that the blind spots cannot be excavated synchronously during the excavation process of the rectangular jacking tunnel boring machine, there will be residual blind spots, and the excavation surface is uneven after the blind spots are excavated, and the blind spot soil layer in the area with strong viscosity cannot be effectively crushed and removed.

[0007] The present invention includes a roadheader housing and several roadheader wall-breaking discs connected by a chain transmission mechanism. At the four corners of the front end of the roadheader body, driving sprockets rotatably connected to the roadheader body are provided. The four driving sprockets are symmetrically distributed in a rectangle. A driving chain is wound around the driving sprockets. The rear end of the driving chain is in contact with the front end of the roadheader housing. The front end of the driving chain is fixedly connected to a belt strip. The front end of the belt strip is fixedly connected to several evenly distributed cutting knives. The side of the cutting knife close to the driving sprocket is bevel-shaped. The side of the cutting knife far from the driving sprocket is in contact with the outer wall of the roadheader housing;

[0008] The driving chain is coaxially and fixedly connected to a driving shaft rod rotatably connected in the roadheader housing. Several driving shaft rods are connected by a chain drive. One of the driving shaft rods is connected to the roadheader wall-breaking disc by a chain transmission mechanism. The roadheader wall-breaking disc is connected to a driving motor fixedly connected in the roadheader housing.

[0009] Preferably, cross bars are connected to the rear ends of the four driving shaft rods. The driving shaft rods are rotatably connected to the cross bars. A support plate is connected in the roadheader housing. An adjusting screw rod is rotatably connected to the support plate. The adjusting screw rod is threadedly connected to the cross bars. An adjusting motor is fixedly connected to the support plate. The adjusting motor is connected to the adjusting screw rod.

[0010] Preferably, several auxiliary wall-breaking rods are rotatably connected in the roadheader housing. The several auxiliary wall-breaking rods are respectively placed at the blind area positions between two adjacent roadheader wall-breaking discs. Wall-breaking discs are coaxially and fixedly connected to the front ends of the auxiliary wall-breaking rods. Wall-breaking knives are fixedly connected to the front ends of the wall-breaking discs. The several auxiliary wall-breaking rods are all connected by a chain transmission mechanism. One of the auxiliary wall-breaking rods is connected to the driving shaft rod by a chain transmission mechanism.

[0011] Preferably, several circumferentially distributed sliding rails are provided on the wall-breaking disc. A sliding box is slidably connected back and forth in the sliding rail. A lifting knife is slidably connected in the sliding box;

[0012] The auxiliary wall-breaking rod is of a hollow structure. A piston circular plate is slidably connected back and forth inside the auxiliary wall-breaking rod. A telescopic screw rod is rotatably connected to the rear end of the piston circular plate. The telescopic screw rod is threadedly connected to a threaded sleeve fixedly connected to the rear end of the auxiliary wall-breaking rod. A rotating disc is coaxially and fixedly connected to the rear end of the auxiliary wall-breaking rod. A sliding shaft is fixedly connected to the rear end of the sliding box. The sliding shaft is fixedly connected to the piston circular plate. The sliding shaft is of a hollow structure and is connected to the sliding box. The piston circular plate is of a hollow structure to form an oil storage chamber. An adjusting piston is slidably connected inside the oil storage chamber. The oil storage chamber is connected to the sliding shaft. A small transmission rod is coaxially and rotatably connected to the rear end of the adjusting piston. The small transmission rod is threadedly connected inside the telescopic screw rod.

[0013] Preferably, a sliding frame is slidably connected back and forth inside the tunneling machine housing. The auxiliary wall-breaking rod is rotatably connected to the sliding frame. The sliding frame is threadedly connected to a threaded rod rotatably connected inside the tunneling machine housing. The threaded rod is connected to an external driving structure.

[0014] Preferably, the threaded rod is threadedly connected to the support plate. The support plate is slidably connected back and forth to the tunneling machine housing.

[0015] The present invention improves the existing rectangular pipe jacking tunneling device. By adding a driving sprocket, a driving chain, a belt strip, a cutting knife and a driving shaft rod, the problem of reducing the pushing force of the cutter head by performing a sawing cut on the soil layer in the blind area is effectively solved. By setting a cross bar, a support plate, an adjusting screw rod and an adjusting motor, the problem of pushing the cutting knife to ensure that the cutting knife can be pushed to the frontmost position flush with the cutter head is effectively solved. By setting an auxiliary wall-breaking rod, a wall-breaking disc and a wall-breaking knife, the problem of crushing and dividing a large area of soil layer in the blind area is effectively solved. By setting a sliding rail, a sliding box, a lifting knife, a piston circular plate and a telescopic screw rod, the problems of being able to adjust the crushing range in real time according to the blind area and being able to store the tool, and facilitating the pushing of the wall-breaking disc to a position flush with the cutter head are effectively realized. By setting a sliding shaft, an oil storage chamber, an adjusting piston and a small transmission rod, the problem of adjusting the extension range of the lifting knife is effectively solved. And the structure is simple and stable, with extremely high universality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of the present invention Figure 1 .

[0017] Figure 2 is a three-dimensional schematic diagram of the present invention Figure 2 .

[0018] Figure 3 is a cross-sectional schematic diagram of the present invention.

[0019] Figure 4 This is a three-dimensional schematic diagram of the driving sprocket and its connecting parts of the present invention.

[0020] Figure 5 This is a schematic diagram of the cutting tool and its connecting parts of the present invention.

[0021] Figure 6 This is a schematic diagram of the auxiliary cell wall breaking rod and its connecting parts of the present invention.

[0022] Figure 7 This is a sectional schematic diagram of the auxiliary cell wall breaking rod and its connecting parts of the present invention.

[0023] Figure 8 This is a sectional schematic diagram of the cell wall breaking disc of the present invention. Detailed implementation manners

[0024] Regarding the foregoing and other technical contents, features and effects of the present invention, they will be clearly presented in the following detailed description of the embodiments in conjunction with the attached Figures 1 to 8 drawings. The structural contents mentioned in the following embodiments are all referenced to the drawings of the specification.

[0025] The exemplary embodiments of the present invention will be described below with reference to the drawings.

[0026] Embodiment 1: The present invention is a blind area excavation device for a rectangular pipe jacking machine, including a tunneling machine housing 1 and a plurality of tunneling machine cell wall breaking discs 2 connected by a chain drive mechanism. The rotation of the tunneling machine cell wall breaking disc 2 realizes the excavation of the tunnel. At the four corners of the front end of the tunneling machine body, there are driving sprockets 3 rotatably connected to the tunneling machine body. The four driving sprockets 3 are symmetrically distributed in a rectangle. A driving chain 4 is wound around the driving sprocket 3. The rotation of the driving sprocket 3 drives the rotation of the driving chain 4. The rear end of the driving chain 4 is in contact with the front end of the tunneling machine housing 1, preventing soil from falling off through the gap between the driving chain 4 and the tunneling machine housing 1 and affecting the normal rotation of the driving chain 4. A belt strip 5 is fixedly connected to the periphery of the driving chain 4. A plurality of evenly distributed cutting tools 6 are fixedly connected to the front end of the belt strip 5. The side of the cutting tool 6 close to the driving sprocket 3 is beveled. The side of the cutting tool 6 away from the driving sprocket 3 is in contact with the outer wall of the tunneling machine housing 1. The rotation of the driving chain 4 drives the synchronous rotation of the belt strip 5. The rotation of the belt strip 5 drives the synchronous rotation of the cutting tool 6. The rotation of the cutting tool 6 realizes the cutting of the soil quality in the blind area, thereby realizing the excavation of the blind area, ensuring that the soil layer can fall off smoothly. At the same time, due to the sawing-type cutting of the cutting tool 6, the smooth falling off of the soil layer and the flatness of the excavation surface are ensured;

[0027] The described driving sprocket wheel 3 and the driving shaft rod 7 connected within the tunneling machine housing 1 are coaxially and fixedly connected. In this embodiment, the driving shaft rod 7 and the tunneling machine housing 1 are rotationally connected. A plurality of the driving shaft rod 7 are connected by chain drive. The rotation of the driving shaft rod 7 drives the synchronous rotation of the driving sprocket wheel 3. One of the driving shaft rod 7 and the tunneling machine wall-breaking disc 2 are connected by a chain drive mechanism. The tunneling machine wall-breaking disc 2 and the driving motor 8 fixedly connected within the tunneling machine housing 1 are connected. The rotation of the driving motor 8 drives the rotation of the tunneling machine wall-breaking disc 2. The rotation of the tunneling machine wall-breaking disc 2 drives the synchronous rotation of the driving shaft rod 7;

[0028] When this embodiment is specifically implemented, during the operation of the tunneling machine, the driving motor 8 is started. The rotation of the motor drives the rotation of the tunneling machine wall-breaking disc 2. The rotation of the tunneling machine wall-breaking disc 2 drives the synchronous rotation of the driving shaft rod 7. The rotation of the driving shaft rod 7 drives the rotation of the driving sprocket wheel 3. The rotation of the driving sprocket wheel 3 drives the rotation of the driving chain 4. The rotation of the driving chain 4 drives the rotation of the belt strip 5. The rotation of the belt strip 5 further drives the rotation of a plurality of the cutting knives 6. Then, the soil layer in the blind area is cut by the cutting knives 6, thereby realizing the excavation of the excavation blind area and ensuring the flatness of the excavation surface at the same time.

[0029] Embodiment 2. On the basis of Embodiment 1, during the process of excavating the blind area by the cutting tool 6, since the tunneling machine breaking wall disc 2 is located in front of the cutting tool 6, the cutting tool 6 cannot completely excavate the blind area, and there will be a section remaining that cannot be flush with the front end of the tunneling machine breaking wall disc 2. Therefore, this embodiment provides a structure to ensure that the cutting tool 6 can completely cut and remove the blind area. Specifically, cross bars 9 are connected to the rear ends of the four drive shaft rods 7, and the drive shaft rods 7 are rotatably connected to the cross bars 9. During the sliding process of the cross bars 9, the drive shaft rods 7 are synchronously slid. A support plate 10 is connected inside the tunneling machine housing 1. In this embodiment, the support plate 10 is fixedly connected to the tunneling machine housing 1. An adjusting screw rod 11 is rotatably connected to the support plate 10, and the adjusting screw rod 11 is threadedly connected to the cross bar 9. An adjusting motor 12 is fixedly connected to the support plate 10, and the adjusting motor 12 is connected to the adjusting screw rod 11. The rotation of the adjusting motor I2 drives the synchronous rotation of the adjusting screw rod 11. The rotation of the adjusting screw rod 11 drives the cross bar 9 to slide back and forth. During the back-and-forth sliding process of the cross bar 9, the drive shaft rods 7 are synchronously slid, thereby driving the drive sprocket 3 to slide synchronously, realizing the forward propulsion of the drive sprocket 3, and further ensuring the continuous forward propulsion of the cutting tool 6 to cut and remove the blind area to be flush with the front end of the tunneling machine breaking wall disc 2.

[0030] Embodiment 3. On the basis of Embodiment 2, when the blind area is large and the soil is too sticky, performing a sawing-type cutting by the cutting tool 6 will cause a large area of the blind area to fall off, resulting in problems such as high pressure on the cutter head during propulsion, impact on the cutter head, or uneven excavation surface caused by the fallen soil layer. Therefore, this embodiment provides a structure to assist in dividing and crushing the blind area. Specifically, a number of auxiliary breaking wall rods 26 are connected inside the tunneling machine housing 1, and the auxiliary breaking wall rods 26 are rotatably connected to the tunneling machine housing 1. The number of auxiliary breaking wall rods 26 are respectively placed at the blind area positions between two adjacent tunneling machine breaking wall discs 2. Breaking wall discs 27 are coaxially and fixedly connected to the front ends of the auxiliary breaking wall rods 26, and breaking wall cutters 28 are fixedly connected to the front ends of the breaking wall discs 27. The rotation of the auxiliary breaking wall rods 26 drives the rotation of the breaking wall discs 27, and the breaking wall discs 27 drive the breaking wall cutters 28 to rotate, thereby realizing the crushing and division of the blind area through the breaking wall cutters 28. The number of auxiliary breaking wall rods 26 are all connected by a chain drive mechanism, and one of the auxiliary breaking wall rods 26 is connected to the drive shaft rod 7 by a chain drive mechanism. The rotation of the drive shaft rod 7 drives the auxiliary breaking wall rods 26 to rotate synchronously.

[0031] Embodiment 4, on the basis of embodiment 3, when the blind area is large, it is necessary to adjust the blind area crushing area, and it is necessary to adjust the cutting range in real time according to the area of the blind area. Therefore, this embodiment provides an adjustable cutting structure. Specifically, the wall breaking disk 27 is provided with a plurality of circumferentially distributed sliding rails 13, and a sliding box 14 is slidably connected to the sliding rail 13 in a front-back direction. A lifting knife 15 is slidably connected to the sliding box 14 in a front-back direction. The sliding box 14 slides back and forth in the sliding rail 13 to ensure that the sliding box 14 and the crushing knife are flush. At the same time, the lifting of the lifting knife 15 realizes the adjustment of the crushing and segmentation area and range.

[0032] The auxiliary wall-breaking rod 26 is a hollow structure, and a piston circular plate 16 is connected to the auxiliary wall-breaking rod 26 for sliding back and forth. The rear end of the piston circular plate 16 is rotatably connected to the telescopic screw 17, and the telescopic screw 17 is threadedly connected to the threaded sleeve 18 fixedly connected to the rear end of the auxiliary wall-breaking rod 26. The telescopic screw 17 rotates to achieve sliding in the auxiliary wall-breaking rod 26, and the sliding of the telescopic screw 17 drives the piston circular plate 16 to slide synchronously. The rear end of the auxiliary wall-breaking rod 26 is coaxially fixedly connected to a rotating disk 19, and the telescopic screw 17 is driven to rotate by rotating the rotating disk 19. The rear end of the sliding box 14 is fixedly connected to a sliding shaft 20, and the sliding shaft 20 is fixedly connected to the piston circular plate 16. The sliding shaft 20 is a hollow structure and is communicated with the sliding box 14, and the piston circular plate 16 slides. The sliding shaft 20 is driven to slide synchronously, and the sliding shaft 20 slides and then drives the sliding box 14 to slide, thereby realizing the adjustment of the position of the sliding box 14. The piston circular plate 16 is a hollow structure to form an oil storage tank 21. The oil storage tank 21 is filled with hydraulic oil. The oil storage tank 21 is internally slidably connected with an adjusting piston 22. The oil storage tank 21 is connected to the sliding shaft 20. The rear end of the adjusting piston 22 is coaxially connected with a small transmission rod 23. The small transmission rod 23 is internally threadedly connected to the telescopic screw 17. By rotating the small transmission rod 23, the adjusting piston 22 is driven to slide synchronously, and the adjusting piston 22 slides. The adjusting piston 22 slides and then pushes the hydraulic oil through the sliding shaft 20 to squeeze the lifting knife 15, thereby realizing the adjustment of the lifting and lowering of the lifting knife 15.

[0033] Example 5. On the basis of Example 4, when the wall is broken by the wall-breaking knife 28, the wall-breaking knife 28 cannot be advanced to the front and cannot be advanced synchronously with the cutting knife 6. Therefore, this embodiment provides a structure for advancing and adjusting the auxiliary wall-breaking rod 26. Specifically, a sliding frame 24 is connected to the interior of the tunnel boring machine housing 1 for sliding movement. The auxiliary wall-breaking rod 26 is rotatably connected to the sliding frame 24. When the sliding frame 24 slides back and forth, it drives the auxiliary wall-breaking rod 26 to slide synchronously. The sliding frame 24 is threadedly connected to the threaded rod 25 rotatably connected to the tunnel boring machine housing 1. The threaded rod 25 is connected to an external driving structure and driven by an external driving device. The threaded rod 25 rotates to drive the sliding frame 24 to slide back and forth, thereby driving the auxiliary wall-breaking rod 26 to slide synchronously.

[0034] Example 6. On the basis of Example 5, the threaded rod 25 and the support plate 10 are threadedly connected, and the support plate 10 and the tunnel boring machine housing 1 are connected in a front-rear sliding manner. When the threaded rod 25 rotates, it drives the support plate 10 and the sliding frame 24 to slide synchronously. At the same time, the cross rod 9 is adjusted separately through the adjustment motor 12.

[0035] When the present invention is used specifically, during the operation of the tunnel boring machine, the driving sprocket 3 and the sliding frame 24 are both at the rear end. First, the lifting knife 15 is adjusted, and the telescopic screw 17 is rotated to achieve sliding in the auxiliary wall-breaking rod 26. The sliding of the telescopic screw 17 drives the piston circular plate 16 to slide synchronously, and the sliding of the piston circular plate 16 drives the sliding shaft 20 to slide synchronously. The sliding of the sliding shaft 20 drives the sliding box 14 to slide, thereby achieving the adjustment of the position of the sliding box 14. Then, by rotating the small transmission rod 23, the adjusting piston 22 is driven to slide synchronously. The adjusting piston 22 slides, and the adjusting piston 22 slides into The hydraulic oil is pushed through the sliding shaft 20 to squeeze the lifting knife 15, thereby realizing the adjustment of the lifting of the lifting knife 15, starting the driving motor 8, the rotation of the motor drives the tunnel boring machine wall breaking disk 2 to rotate, the rotation of the tunnel boring machine wall breaking disk 2 drives the driving shaft 7 to rotate synchronously, the rotation of the driving shaft 7 drives the driving sprocket 3 to rotate, the rotation of the driving sprocket 3 drives the driving chain 4 to rotate, the rotation of the driving chain 4 drives the belt strip 5 to rotate, the rotation of the belt strip 5 drives the plurality of cutting knives 6 to rotate, and then the soil layer in the blind area is cut by the cutting knives 6, thereby realizing the excavation of the blind area and ensuring the flatness of the excavation surface at the same time;

[0036] After the excavation is completed, the lifting knife 15 is reset, and then the threaded rod 25 and the adjusting screw 11 are rotated forward and backward respectively to push the sliding frame 24 and the support plate 10 forward until they are flush with the front end of the tunnel boring machine's wall-breaking disk 2, thereby achieving complete excavation of the blind area.

[0037] The present invention improves the existing rectangular pipe-jacking tunneling device. By adding a driving sprocket, a driving chain, a belt strip, a cutting knife and a driving shaft rod, the problem of reducing the pushing force of the cutter head by performing a sawing cut on the soil layer in the blind area is effectively solved; by setting a cross bar, a support plate, an adjusting screw rod and an adjusting motor, the problem of pushing the cutting knife is effectively solved, ensuring that the cutting knife can be pushed to the frontmost position flush with the cutter head; by setting an auxiliary wall-breaking rod, a wall-breaking disc and a wall-breaking knife, the problem of crushing and dividing a large area of soil layer in the blind area is effectively solved; by setting a sliding rail, a sliding box, a lifting knife, a piston circular plate and a telescopic screw rod, the problems of being able to adjust the crushing range in real time according to the blind area and being able to store the cutting tools, facilitating the pushing of the wall-breaking disc to a position flush with the cutter head are effectively realized; by setting a sliding shaft, an oil storage chamber, an adjusting piston and a small transmission rod, the problem of adjusting the extension range of the lifting knife is effectively solved; and the structure is simple and stable, with extremely high universality.

Claims

1. A blind area excavation device for a rectangular jacking tunnel boring machine, comprising a tunnel boring machine housing (1), and a plurality of tunnel boring machine wall breaking discs (2) connected by a chain transmission mechanism, characterized in that: The four corners of the front end of the tunnel boring machine body are each provided with a driving sprocket (3) rotatably connected to the tunnel boring machine body, the four driving sprockets (3) are symmetrically distributed in a rectangular shape, a driving chain (4) is wound around the driving sprocket (3), the rear end of the driving chain (4) is in contact with the front end of the tunnel boring machine housing (1), the front end of the driving chain (4) is fixedly connected to a belt strip (5), the front end of the belt strip (5) is fixedly connected to a plurality of evenly distributed cutting knives (6), the side of the cutting knives (6) close to the driving sprocket (3) is in an inclined shape, and the side of the cutting knives (6) away from the driving sprocket (3) is in contact with the outer wall of the tunnel boring machine housing (1); The driving chain (4) and the driving shaft (7) rotatably connected in the tunnel boring machine housing (1) are coaxially fixedly connected, and several of the driving shafts (7) are connected through chain transmission, one of the driving shafts (7) and the tunnel boring machine wall breaking disk (2) is connected through a chain transmission mechanism, and the tunnel boring machine wall breaking disk (2) is connected to the driving motor (8) fixedly connected in the tunnel boring machine housing (1).

2. A blind area excavation device for a rectangular pipe jacking machine according to claim 1, characterized in that: The rear ends of the four driving shafts (7) are connected to a cross rod (9), the driving shafts (7) and the cross rods (9) are rotatably connected, a support plate (10) is connected inside the tunnel boring machine housing (1), an adjusting screw (11) is rotatably connected to the support plate (10), the adjusting screw (11) and the cross rods (9) are threadedly connected, an adjusting motor (12) is fixedly connected to the support plate (10), and the adjusting motor (12) and the adjusting screw (11) are connected.

3. The blind area excavation device for a rectangular pipe jacking machine according to claim 2, characterized in that: A plurality of auxiliary wall-breaking rods (26) are rotatably connected in the tunnel boring machine housing (1), and the plurality of auxiliary wall-breaking rods (26) are respectively placed in the blind area between two adjacent tunnel boring machine wall-breaking disks (2). The front ends of the auxiliary wall-breaking rods (26) are coaxially fixedly connected to the wall-breaking disk (27), and the front ends of the wall-breaking disk (27) are fixedly connected to the wall-breaking knife (28). The plurality of auxiliary wall-breaking rods (26) are connected through a chain transmission mechanism, and one of the auxiliary wall-breaking rods (26) and the driving shaft (7) are connected through a chain transmission mechanism.

4. The blind area excavation device for a rectangular pipe jacking machine according to claim 3, characterized in that: The wall-breaking plate (27) is provided with a plurality of circumferentially distributed sliding rails (13), a sliding box (14) is slidably connected to the sliding rails (13), and a lifting knife (15) is slidably connected to the sliding box (14); The auxiliary wall-breaking rod (26) is a hollow structure. A piston disc (16) is connected to the auxiliary wall-breaking rod (26) in a forward and backward sliding manner. The rear end of the piston disc (16) is rotatably connected to a telescopic screw (17). The telescopic screw (17) is threadedly connected to a threaded sleeve (18) fixedly connected to the rear end of the auxiliary wall-breaking rod (26). The rear end of the auxiliary wall-breaking rod (26) is coaxially fixedly connected to a rotating disk (19). The rear end of the sliding box (14) is fixedly connected to a sliding shaft (20). The sliding shaft (20) The piston disc (16) is fixedly connected to the sliding shaft (20), the sliding shaft (20) is a hollow structure and is connected to the sliding box (14), the piston disc (16) is a hollow structure to form an oil storage tank (21), the oil storage tank (21) is internally slidably connected to an adjusting piston (22), the oil storage tank (21) is connected to the sliding shaft (20), the rear end of the adjusting piston (22) is coaxially connected to a small transmission rod (23), and the small transmission rod (23) is internally threadedly connected to the telescopic screw (17).

5. The blind area excavation device for a rectangular pipe jacking machine according to claim 4, characterized in that: The tunnel boring machine housing (1) is internally connected to a sliding frame (24) in a forward and backward sliding manner, the auxiliary wall-breaking rod (26) is rotatably connected to the sliding frame (24), the sliding frame (24) is threadedly connected to a threaded rod (25) rotatably connected to the tunnel boring machine housing (1), and the threaded rod (25) is connected to an external driving structure.

6. The blind area excavation device for a rectangular pipe jacking machine according to claim 5, characterized in that: The threaded rod (25) and the support plate (10) are threadedly connected, and the support plate (10) and the tunnel boring machine housing (1) are slidably connected front and back.

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