Earth pressure balance type mechanical pipe jacking machine and pipe jacking method thereof

Abstract

The invention discloses an earth pressure balance type mechanical pipe jacking machine and a pipe jacking method thereof, and particularly relates to the field of pipe jacking machines. The pipe jacking machine comprises back iron, a machine pit guide rail is installed on the back iron, a jack is installed on the side, close to the machine pit guide rail, of the back iron, a sliding plate is installed on the machine pit guide rail in a sliding mode, and the output end of the jack and the sliding plate are fixedly installed; a machine head is arranged on the side, away from the back iron, of the sliding plate, and the jack is used for jacking the pipeline in the direction of the machine head and pushing the machine head to move forwards. By arranging the push blocks and the driving device, when the machine head deflects, a part of the push block at the corresponding position can extend out of the containing groove, so that the acting force of the jack acts on the end part of the pipeline through the push blocks to rectify the deviation of the machine head, and the force applied by the jack acts on a certain position of the end part of the pipeline through the push blocks, so that the deviation of the machine head is corrected. In the deviation rectifying process, all the oil cylinders of the jack can work at the same time, and therefore enough thrust can be guaranteed, and deviation rectifying can be carried out smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe jacking machines, and more specifically, to an earth pressure balance type mechanical pipe jacking machine and a pipe jacking method thereof. Background Art

[0002] Pipe jacking construction is a method of underground pipeline construction. Its biggest advantage is that it can cross roads and various underground pipelines without excavating the surface. With the advantages of small construction area, environmental protection, and little disturbance to road traffic and buildings, it is widely used in municipal pipelines, subways, and hydropower applications.

[0003] The pipe jacking machine consists of a back iron, machine pit guide rails, a jack, a jacking iron, a mud pump, a machine head, a laser theodolite, etc. During the construction process, under the thrust of the jack, the tool pipe will first enter the soil layer and dig inward, and then the jack will retract, the next section of the pipe will be hoisted and pushed forward, and so on and so forth to lay the entire pipeline. During this process, the excavated soil is discharged in the form of mud through the mud pump.

[0004] During the process of pipe jacking, the soil pressure value in the sealed soil chamber can be controlled by controlling the amount of soil discharged or the jacking speed of the pipe jacking machine, so that this soil pressure value is balanced with the static soil pressure value in front, thereby preventing excessive settlement or uplift of the ground surface.

[0005] During the jacking process, the pipe jacking machine is prone to directional deviation due to the difference in the properties of the excavation surface soil layer. At the same time, under the influence of the deadweight of the cutter head of the pipe jacking machine, the pipe jacking machine also has a downward trend. The current solution is to install a laser theodolite to monitor the posture of the pipe jacking machine so that it can be corrected in time when directional deviation occurs. Correction is to use the four cylinders of the jack to correct the deflection. For example, if the pipe jacking machine deflects downward, the cylinder pushes the lower side of the pipe. However, when correcting the deviation in this way, only one or two cylinders can work, the propulsion force is insufficient, and the advancement is difficult. Summary of the invention

[0006] The invention provides an earth pressure balance mechanical pipe jacking machine and a pipe jacking method thereof, and aims to solve the problem that when the existing pipe jacking machine is correcting deviation, only one or two oil cylinders can work, the propulsion force is insufficient, and the propulsion is difficult.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an earth pressure balance mechanical pipe jacking machine, comprising a back iron, a machine pit guide rail is installed on the back iron, a jack is installed on the side of the back iron close to the machine pit guide rail, a slide is slidably installed on the machine pit guide rail, the output end of the jack is fixedly installed with the slide, a machine head is arranged on the side of the slide away from the back iron, the jack is used to push the pipeline in the direction of the machine head, and push the machine head to move forward, so that the machine head moves forward; a top ring is fixedly connected to the side of the slide away from the jack, a plurality of receiving grooves are opened in the circumferential direction of the top ring, the receiving groove is opened on the side away from the slide, and a push block is arranged inside the receiving groove; the pipe jacking machine also includes a driving device, the driving device is used to push the push block outward from the receiving groove to support the end of the pipe, so that a gap is formed between the top ring and the pipe.

[0008] In a preferred embodiment, the driving device includes a rotating mechanism, a pressing mechanism and several supporting mechanisms. The pressing mechanism is installed at the output end of the rotating mechanism, so that the rotating mechanism drives the pressing mechanism to rotate. The pressing mechanism is used to push the supporting mechanism so that the supporting mechanism pushes the push block out of the accommodating groove.

[0009] In a preferred embodiment, the supporting mechanism includes a fixed frame, which is fixedly mounted on the top ring, and a movable frame is slidably mounted on the fixed frame, and the movable frame is arranged along the radial direction of the top ring. A plurality of supporting blocks are mounted on the movable frame, and one side of the push block has an inclined surface, and the support block pushes the inclined surface so that the push block is pushed outward from the accommodating groove.

[0010] In a preferred embodiment, a fixing column is fixedly mounted on the fixing frame, an elastic component is sleeved on the outer side of the fixing column, two ends of the elastic component are respectively pressed with the fixing frame and the movable frame, and the elastic component is used to push the movable frame toward the middle of the top ring.

[0011] In a preferred embodiment, the pressing mechanism includes a mounting plate, on which a linear drive component is fixedly mounted, a pressure block is mounted at the output end of the linear drive component, and one side of the movable frame has a protrusion, and the linear drive component pushes the protrusion through the pressure block.

[0012] In a preferred embodiment, the rotating mechanism includes a rotating driving component, a main shaft is installed at the output end of the rotating driving component, a mounting plate is fixedly installed on the main shaft, a bracket is installed on the slide plate, and the rotating driving component is fixedly installed on the bracket.

[0013] In a preferred embodiment, the movable frame is provided with a through hole at the upper side of the protrusion, and a rotating shaft is rotatably connected to the through hole through a torsional elastic member. A straight groove is provided on the side wall of the fixed frame, and a groove is provided at the upper end of the straight groove. A slider is fixedly connected to one end of the rotating shaft, and the slider is located inside the groove. The torsional elastic member is used to keep the length direction of the slider in a position pointing to the length direction of the straight groove. A pressure plate is fixedly connected to the end of the rotating shaft away from the slider, and the pressure plate is horizontally arranged.

[0014] In a preferred embodiment, four push blocks are provided and are evenly distributed in the circumferential direction of the top ring, three linear drive components are provided, and the angle between adjacent linear drive components is 45°.

[0015] In a preferred embodiment, a laser theodolite is installed on the back iron, and the laser theodolite is used to monitor the posture of the machine head.

[0016] The present invention also provides a method for pipe jacking using the above-mentioned earth pressure balance mechanical pipe jacking machine, comprising the following steps:

[0017] Step 1: Place the pipe at the front end of the push block;

[0018] Step 2: Push the pipe and the machine head forward by using the jack, so that the machine head can dig forward and push the pipe into the soil layer;

[0019] Step 3: Repeat the above steps 1 and 2 until all subsequent pipelines are advanced;

[0020] In the above steps 2 and 3, if the machine head is deflected, the driving device will push the corresponding push block outward from the accommodating groove so that the push block can support the end of the pipe, and then the top ring and the push block are pushed by the jack to correct the deviation of the machine head.

[0021] Technical effects and advantages of the present invention:

[0022] The present invention provides a push block and a driving device. When the machine head is deflected, the push block at the corresponding position can be partially extended from the accommodating groove, so that the force of the jack can act on the end of the pipe through the push block to correct the deviation of the machine head. Since the force applied by the jack acts on a certain position of the end of the pipe through the push block, during the deviation correction process, all the cylinders of the jack can work simultaneously, thereby ensuring sufficient thrust and making the deviation correction proceed smoothly.

[0023] The present invention provides a rotating shaft, a sliding block, a pressure plate, a straight groove and a groove, and can drive the movable frame to move upward by pushing the pressure plate when the pressure block moves upward, thereby avoiding the problem that the elastic component cannot reset the movable frame and the support block upward due to the large friction between the push block and the support block. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the local structure of the present invention Figure 1 .

[0026] Figure 3 It is a schematic diagram of the local structure of the present invention Figure 2 .

[0027] Figure 4 It is a schematic diagram of the local structure of the present invention Figure 3 .

[0028] Figure 5 For the present invention Figure 4 Rear view of.

[0029] Figure 6 The structure of the driving device of the present invention is shown in FIG. Figure 1 .

[0030] Figure 7 The structure of the driving device of the present invention is shown in FIG. Figure 2 .

[0031] Figure 8 It is a structural schematic diagram of the support mechanism of the present invention.

[0032] Fig. 9 It is a cross-sectional view of the support mechanism of the present invention.

[0033] Fig.10 The present invention is a flow chart of a method for pipe jacking by a pipe jacking machine.

[0034] The accompanying drawings are marked as follows: 1. back iron; 2. machine pit guide rail; 3. jack; 4. slide plate; 5. machine head; 6. top ring; 61. accommodating groove; 62. notch; 7. push block; 71. inclined surface; 8. driving device; 81. supporting mechanism; 811. fixed frame; 8111. straight groove; 8112. groove; 812. movable frame; 8121. protrusion; 8122. through hole; 813. supporting block; 814. fixed column; 815. elastic component; 82. pressing mechanism; 821. mounting plate; 822. linear drive component; 823. pressing block; 83. rotating mechanism; 831. rotating drive component; 832. main shaft; 84. rotating shaft; 841. slider; 85. pressing plate; 9. bracket; 100. pipeline. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Refer to the instruction manual Figure 1-Figure 10 A soil pressure balance mechanical pipe jacking machine comprises a back iron 1, on which a machine pit guide rail 2 is installed, a jack 3 is installed on the side of the back iron 1 close to the machine pit guide rail 2, a slide plate 4 is slidably installed on the machine pit guide rail 2, an output end of the jack 3 is fixedly installed with the slide plate 4, a machine head 5 is arranged on the side of the slide plate 4 away from the back iron 1, the jack 3 is used to push the pipeline 100 in the direction of the machine head 5, and push the machine head 5 to move forward, so that the machine head 5 is excavated forward; a top ring 6 is fixedly connected to the side of the slide plate 4 away from the jack 3, and a plurality of receiving grooves 61 are opened in the circumferential direction of the top ring 6, the receiving groove 61 is opened on the side away from the slide plate 4, and a push block 7 is arranged inside the receiving groove 61; the pipe jacking machine also comprises a driving device 8, the driving device 8 is used to push the push block 7 outward from the receiving groove 61 to support the end of the pipe 100, so that a gap is formed between the top ring 6 and the pipe 100.

[0037] Furthermore, a laser theodolite is installed on the back iron 1 , and the laser theodolite is used to monitor the posture of the machine head 5 .

[0038] It should be noted that during the pipe jacking construction process of the pipe jacking machine, the posture of the machine head 5 is monitored by a laser theodolite to determine whether the machine head 5 is deflected. If deflection occurs, correction is required. For example, if the pipe jacking machine deflects downward, the jack 3 pushes the lower side of the pipe 100, and if the pipe jacking machine deflects to the left, the jack 3 pushes the left side of the pipe 100.

[0039] In this embodiment, the implementation method is specifically as follows: during the construction of the pipe jacking machine, first place the pipe 100 at the front end of the push block 7; then push the pipe 100 and the machine head 5 forward through the jack 3, so that the machine head 5 digs forward and pushes the pipe 100 into the soil layer; repeat the pushing of the push block 7 until all subsequent pipes 100 are pushed in. During the pipe jacking construction process, if the machine head 5 is deflected, it is necessary to correct the deviation. Specifically, the push block 7 is partially pushed out of the receiving groove 61 by the driving device 8 so that the push block 7 is pressed against the end of the pipe 100. At this time, a gap is generated between the top ring 6 and the pipe 100. The thrust applied by the jack 3 to the top ring 6 acts on the pipe 100 through the push block 7, and then acts on the machine head 5, thereby correcting the deviation. Figure 2As shown, four push blocks 7 are provided. If the machine head 5 deflects downward, the push block 7 at the bottom is extended to apply thrust to the lower side of the pipe 100; if the machine head 5 deflects to the left, the push block 7 on the left is extended to apply thrust to the left side of the pipe 100; if the machine head 5 deflects to the lower right side, the push blocks 7 on the right and lower sides are extended to apply thrust to the lower right side of the pipe 100. If the deviation cannot be completely corrected at this time, the push block 7 on the right or the push block 7 on the lower side can be extended alone for secondary correction, or the push block 7 on the right or the push block 7 on the lower side can be extended alone for correction.

[0040] The above technical solution is provided with a push block 7 and a driving device 8. When the machine head 5 is deflected, the push block 7 at the corresponding position can extend a part of it from the accommodating groove 61, so that the force of the jack 3 can act on the end of the pipe 100 through the push block 7 to correct the deviation of the machine head 5. Since the force applied by the jack 3 acts on a certain position of the end of the pipe 100 through the push block 7, during the deviation correction process, all the cylinders of the jack 3 can work simultaneously, thereby ensuring sufficient thrust and making the deviation correction proceed smoothly.

[0041] Refer to the instruction manual Figure 2-Figure 9 The driving device 8 includes a rotating mechanism 83, a pressing mechanism 82 and a plurality of supporting mechanisms 81. The pressing mechanism 82 is installed at the output end of the rotating mechanism 83, so that the rotating mechanism 83 drives the pressing mechanism 82 to rotate. The pressing mechanism 82 is used to push the supporting mechanism 81, so that the supporting mechanism 81 pushes the push block 7 outward from the accommodating groove 61.

[0042] It should be noted that a plurality of support mechanisms 81 are installed in the circumferential direction of the top ring 6, and the rotating mechanism 83 drives the pressing mechanism 82 to rotate around the axis of the top ring 6. When correction is required, the pressing mechanism 82 is aligned with the corresponding support mechanism 81, and then the pressing mechanism 82 pushes the support mechanism 81, so that the support mechanism 81 pushes a portion of the push block 7 outward from the accommodating groove 61, thereby correcting the corresponding position.

[0043] Furthermore, the supporting mechanism 81 includes a fixed frame 811, which is fixedly mounted on the top ring 6, and a movable frame 812 is slidably mounted on the fixed frame 811. The movable frame 812 is arranged along the radial direction of the top ring 6, and a plurality of supporting blocks 813 are mounted on the movable frame 812. One side of the push block 7 has a slope 71, and the support block 813 pushes the slope 71 to push the push block 7 outward from the accommodating groove 61.

[0044] Furthermore, a fixed column 814 is fixedly installed on the fixed frame 811, and an elastic component 815 is sleeved on the outer side of the fixed column 814. The two ends of the elastic component 815 are respectively pressed with the fixed frame 811 and the movable frame 812. The elastic component 815 is used to push the movable frame 812 toward the middle of the top ring 6.

[0045] It should be noted that a notch 62 is provided at the position of the receiving groove 61 at the inner side wall of the top ring 6. When the support mechanism 81 needs to be extended from the receiving groove 61, the movable frame 812 is pushed by the top pressing mechanism 82, so that the movable frame 812 drives the support block 813 to push the inclined surface 71 from the position of the notch 62, so that the push block 7 can be extended from a part of the receiving groove 61. When the deviation correction is completed, under the action of the elastic component 815, the movable frame 812 is pushed to move toward the middle direction of the support mechanism 81, so that the support block 813 is separated from the push block 7, and the push block 7 does not need to be actively moved back to the receiving groove 61. In the next pipe jacking process, it can be pushed back to the receiving groove 61. Among them, the elastic component 815 is a compression spring.

[0046] Furthermore, the pressing mechanism 82 includes a mounting plate 821 on which a linear driving component 822 is fixedly mounted. A pressing block 823 is mounted at the output end of the linear driving component 822 . A protrusion 8121 is provided on one side of the movable frame 812 , and the linear driving component 822 pushes the protrusion 8121 through the pressing block 823 .

[0047] It should be noted that the linear driving component 822 adopts a cylinder, and the linear driving component 822 drives the pressing block 823 to push the movable frame 812 to move.

[0048] Furthermore, the rotating mechanism 83 includes a rotating driving component 831 , a main shaft 832 is installed at the output end of the rotating driving component 831 , the mounting plate 821 is fixedly installed on the main shaft 832 , a bracket 9 is installed on the slide plate 4 , and the rotating driving component 831 is fixedly installed on the bracket 9 .

[0049] It should be noted that the rotary drive component 831 is a reduction motor, which drives the mounting plate 821 to rotate, so that the linear drive component 822 and the pressure block 823 point to the corresponding support mechanism 81 to correct the different skew positions of the machine head 5.

[0050] Refer to the instruction manual Figure 6-Figure 9 The movable frame 812 is provided with a through hole 8122 at the upper side of the protrusion 8121, and the rotating shaft 84 is rotatably connected in the through hole 8122 through a torsion elastic member. A straight groove 8111 is provided on the side wall of the fixed frame 811, and a groove 8112 is provided at the upper end of the straight groove 8111. A slider 841 is fixedly connected to one end of the rotating shaft 84, and the slider 841 is located inside the groove 8112. The torsion elastic member is used to keep the length direction of the slider 841 at a position pointing to the length direction of the straight groove 8111. The end of the rotating shaft 84 away from the slider 841 is fixedly connected to a pressure plate 85, and the pressure plate 85 is horizontally arranged.

[0051] It should be noted that the torsion elastic member is a torsion spring. When no deviation correction is performed, that is, when the support block 813 does not push the push block 7, the pressure plate 85 is in a horizontal position, the slider 841 is located inside the groove 8112, and the length direction of the slider 841 is the same as the length direction of the straight groove 8111, and the end of the slider 841 is aligned with the straight groove 8111. When deviation correction is required, the pressure block 823 needs to push the protrusion 8121 downward to move the movable frame 812 and the support block 813. Specifically, as Figure 7 As shown, the pressing block 823 first pushes the pressing plate 85 to rotate downward. When the pressing block 823 contacts the protruding portion 8121, the pressing block 823 and the pressing plate 85 are separated. Under the action of the torsion elastic member, the pressing plate 85 is restored to a horizontal state. Then the pressing block 823 pushes the protruding portion 8121 to move downward, thereby driving the movable frame 812 and the supporting block 813 to move downward. During this process, the rotating shaft 84 moves together with the movable frame 812, so that the slider 841 enters the interior of the straight groove 8111. After the deviation correction is completed, the linear drive component 822 drives the pressure block 823 to reset upward. First, the pressure block 823 contacts the pressure plate 85 upward. Since the slider 841 is located inside the straight groove 8111, the rotating shaft 84 and the pressure plate 85 cannot rotate at this time. In other words, when the pressure block 823 moves upward, it can drive the pressure plate 85 to move upward together, and the movable frame 812 and the support block 813 also move upward together. The slider 841 moves upward inside the straight groove 8111. When it moves to the inside of the groove 8112, the slider 841 can rotate inside the groove 8112. At this time, when the pressure block 823 pushes the pressure plate 85 upward, the pressure plate 85 will rotate upward and disengage from the pressure block 823, and at this time, the support block 813 is disengaged from the push block 7.

[0052] The above technical solution, by setting a rotating shaft 84, a slider 841, a pressure plate 85, a straight groove 8111 and a groove 8112, can drive the movable frame 812 to move upward by pushing the pressure plate 85 when the pressure block 823 moves upward, thereby avoiding the problem that the elastic component 815 cannot reset the movable frame 812 and the support block 813 upward due to the large friction between the push block 7 and the support block 813.

[0053] Refer to the instruction manual Figure 2 and Figure 4 There are four push blocks 7 that are evenly distributed in the circumferential direction of the top ring 6 , and there are three linear drive components 822 , and the angle between adjacent linear drive components 822 is 45°.

[0054] It should be noted that when only one push block 7 needs to be pushed, the linear driving component 822 and the pressing block 823 in the middle are used to push the supporting mechanism 81. Figure 5 As shown, when two adjacent push blocks 7 need to be pushed simultaneously, as shown in Figure 5As shown, the mounting plate 821 is rotated 45°, and the linear driving components 822 and the pressing blocks 823 on both sides push the corresponding supporting mechanisms 81 .

[0055] Refer to the instruction manual Fig.10 This embodiment also provides a method for pipe jacking using the above-mentioned earth pressure balance mechanical pipe jacking machine, comprising the following steps:

[0056] Step 1: Place the pipe 100 at the front end of the push block 7;

[0057] Step 2: Push the pipe 100 and the machine head 5 forward by the jack 3, so that the machine head 5 digs forward and pushes the pipe 100 into the soil layer;

[0058] Step 3: Repeat the above steps 1 and 2 until all subsequent pipelines 100 are pushed forward;

[0059] In the above steps 2 and 3, if the machine head 5 is deflected, the driving device 8 will push the corresponding push block 7 outward from the accommodating groove 61 so that the push block 7 can support the end of the pipe 100, and then the top ring 6 and the push block 7 are pushed by the jack 3 to correct the deviation of the machine head 5.

[0060] The construction process of the pipe jacking machine is as follows:

[0061] (1) Obtain elevation and centerline data based on the construction drawings, and measure the actual elevation, centerline, and well section distance between the entrance and exit.

[0062] (2) Use a theodolite (a total station is used when there is no line of sight) to measure the center line of the actual hole to the concrete walls on both sides of the working pit, mark it with steel nails and protect it. After verification, the error shall not exceed ±5mm, and two leveling points shall be set in each jacking pit.

[0063] (3) Install the equipment.

[0064] (4) Debugging of jacking equipment: A professional electrician will connect the construction electricity to the secondary electric box outside the operation room, and then the secondary electric box will connect the cable to the tertiary electric box in the operation room to ensure smooth circuit. A large-tonnage crane will be used to hoist the machine head 5 into place. After assembly, all circuits will be connected and the operating status of each electrical appliance will be debugged.

[0065] (5) Initial jacking: After the equipment is debugged and checked, the initial jacking begins. The initial jacking section is from the time the machine head 5 enters the hole to the stage when the jacking works normally.

[0066] (6) Pipe jacking

[0067] After the machine head 5 enters, the first ductile iron pipe (pipeline 100) is hoisted onto the machine pit guide rail 2, and the ductile iron pipe and the tail of the machine head 5 are connected by a socket-and-spigot connection.

[0068] Jack 3 starts to work, and the hydraulic cylinder supports the ductile iron pipe with a jacking distance of 3 meters (main and auxiliary cylinders 1.6m+1.4m).

[0069] After the ductile iron pipe is pushed forward for 3m, the top iron is installed on the track, and the length of the top iron is 1m. According to the size of the working well, 4 to 5 top irons are installed and the pipe jacking operation is continued.

[0070] Jacking measurement: Initial jacking is measured once every 1 meter and recorded. During normal jacking, it is measured once every 3 meters. In case of deviation correction, it is measured once every 1 meter. When measuring, attention should be paid to the consistency between the laser point irradiated on the laser target of the machine head and the central axis of the pipeline. If there is a deviation, notify the operator to make timely adjustments. The surveying personnel draw the pipeline center and elevation curves respectively to predict the forward trend of the machine head 5 at any time.

[0071] Deflection correction during jacking: Continuously observe the trajectory of the laser point on the optical target. If the deviation is greater than 20 mm and it is predicted that the machine head 5 has a tendency to develop in the direction of large deviation, corrective measures should be taken. Start the correction jack 3 during deviation correction. During deviation correction, measure once every 1 meter and compare the data of the machine head and the tail. When there is a regression trend, stop the deviation correction after maintaining a certain jacking distance to prevent left and right swinging. The principle of deviation correction is frequent correction and micro correction. The amount of correction should not be too large each time, and attention should be paid to the development trend. When deviations occur both up and down and left and right, correct up and down first and then left and right.

[0072] 6. Jacking speed: The jacking speed is controlled at 80 mm to 100 mm / minute. A lower speed is used in the first 10 meters after entering the hole and when correcting the deviation. The jacking speed can be appropriately accelerated depending on the excavation conditions and the torque of the cutter disc.

[0073] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An earth pressure balance mechanical pipe jacking machine, characterized in that: The invention comprises a back iron (1), a machine pit guide rail (2) is installed on the back iron (1), a jack (3) is installed on the side of the back iron (1) close to the machine pit guide rail (2), a slide plate (4) is slidably installed on the machine pit guide rail (2), an output end of the jack (3) is fixedly installed on the slide plate (4), a machine head (5) is arranged on the side of the slide plate (4) away from the back iron (1), and the jack (3) is used to push the pipeline (100) toward the machine head (5) and push the machine head (5) forward, so that the machine head (5) moves forward; A top ring (6) is fixedly connected to the side of the slide plate (4) away from the jack (3), a plurality of receiving grooves (61) are provided in the circumferential direction of the top ring (6), the receiving grooves (61) are openly arranged on the side away from the slide plate (4), and a push block (7) is arranged inside the receiving grooves (61); The pipe jacking machine also includes a driving device (8), which is used to push the push block (7) outward from the receiving groove (61) to push against the end of the pipe (100), so that a gap is formed between the top ring (6) and the pipe (100).

2. The earth pressure balance mechanical pipe jacking machine according to claim 1, characterized in that: The driving device (8) comprises a rotating mechanism (83), a pressing mechanism (82) and a plurality of supporting mechanisms (81); the pressing mechanism (82) is installed at the output end of the rotating mechanism (83), so that the rotating mechanism (83) drives the pressing mechanism (82) to rotate; the pressing mechanism (82) is used to push the supporting mechanism (81), so that the supporting mechanism (81) pushes the push block (7) out of the receiving groove (61).

3. The earth pressure balance mechanical pipe jacking machine according to claim 2, characterized in that: The support mechanism (81) comprises a fixed frame (811), the fixed frame (811) is fixedly mounted on the top ring (6), a movable frame (812) is slidably mounted on the fixed frame (811), the movable frame (812) is arranged along the radial direction of the top ring (6), a plurality of support blocks (813) are mounted on the movable frame (812), one side of the push block (7) has an inclined surface (71), and the support block (813) pushes the inclined surface (71) to push the push block (7) outward from the accommodating groove (61).

4. The earth pressure balance mechanical pipe jacking machine according to claim 3, characterized in that: A fixed column (814) is fixedly mounted on the fixed frame (811), and an elastic component (815) is sleeved on the outer side of the fixed column (814). Two ends of the elastic component (815) are respectively pressed against the fixed frame (811) and the movable frame (812), and the elastic component (815) is used to push the movable frame (812) toward the middle of the top ring (6).

5. The earth pressure balance mechanical pipe jacking machine according to claim 4, characterized in that: The pressing mechanism (82) comprises a mounting plate (821), a linear driving component (822) is fixedly mounted on the mounting plate (821), a pressing block (823) is mounted on the output end of the linear driving component (822), one side of the movable frame (812) has a protruding portion (8121), and the linear driving component (822) pushes the protruding portion (8121) via the pressing block (823).

6. The earth pressure balance mechanical pipe jacking machine according to claim 5, characterized in that: The rotating mechanism (83) comprises a rotating drive component (831), the output end of the rotating drive component (831) is mounted with a main shaft (832), the mounting plate (821) is fixedly mounted on the main shaft (832), a bracket (9) is mounted on the slide plate (4), and the rotating drive component (831) is fixedly mounted on the bracket (9).

7. The earth pressure balance mechanical pipe jacking machine according to claim 6, characterized in that: The movable frame (812) is provided with a through hole (8122) at an upper position of the protruding portion (8121); a rotating shaft (84) is rotatably connected in the through hole (8122) via a torsion elastic member; a straight groove (8111) is provided on the side wall of the fixed frame (811); a groove (8112) is provided at the upper end of the straight groove (8111); a slider (841) is fixedly connected to one end of the rotating shaft (84); the slider (841) is located inside the groove (8112); the torsion elastic member is used to keep the length direction of the slider (841) at a position pointing to the length direction of the straight groove (8111); a pressing plate (85) is fixedly connected to one end of the rotating shaft (84) away from the slider (841); and the pressing plate (85) is arranged horizontally.

8. The earth pressure balance mechanical pipe jacking machine according to claim 7, characterized in that: There are four push blocks (7) evenly distributed in the circumferential direction of the top ring (6); there are three linear drive components (822), and the angle between adjacent linear drive components (822) is 45°.

9. The earth pressure balance mechanical pipe jacking machine according to claim 1, characterized in that: A laser theodolite is installed on the back iron (1), and the laser theodolite is used to monitor the posture of the machine head (5).

10. A method for pipe jacking using the earth pressure balance mechanical pipe jacking machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: placing the pipe (100) at the front end of the push block (7); Step 2: Push the pipe (100) and the machine head (5) forward by means of the jack (3), so that the machine head (5) digs forward and pushes the pipe (100) into the soil layer; Step 3: Repeat the above steps 1 and 2 until all subsequent pipelines (100) are advanced; In the above steps 2 and 3, if the machine head (5) is deflected, the driving device (8) will push the corresponding push block (7) outward from the receiving groove (61) so that the push block (7) can support the end of the pipe (100), and then the top ring (6) and the push block (7) are pushed by the jack (3), so as to correct the deviation of the machine head (5).

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