A small earth pressure balance pipe jacking machine

Abstract

This utility model discloses a small-scale earth pressure balance pipe jacking machine. The small-scale earth pressure balance pipe jacking machine includes a shell, with a soil chamber at the front of the shell. Four cutterheads are arranged in two rows, two in the upper row and two in the lower row. A drive mechanism for rotating the cutterheads is installed inside the shell. The drive shaft of the drive mechanism extends out of the soil chamber and is fixedly connected to the cutterheads. A soil discharge port is located on the bottom of the soil chamber between the drive mechanisms. A auger is installed at the soil discharge port. At least one pair of cutterheads located diagonally have stirring rods on their backs for conveying soil from the soil chamber into the soil discharge port. This utility model solves the problem that large equipment cannot directly excavate ultra-large cross-section underground tunnels.

Description

Technical Field

[0001] This utility model relates to the field of pipe jacking machine technology, and in particular to a small earth pressure balance pipe jacking machine. Background Technology

[0002] A Chinese utility model patent with publication number CN216198114U, entitled "A Novel Rectangular Pipe Jacking Machine," discloses that the diameter of the first cutterhead is smaller than that of the second cutterhead, and the distance between the first cutterhead and the front face of the machine body is greater than that between the second cutterhead and the front face of the machine body. By setting the diameter of the first cutterhead to be smaller than that of the second cutterhead, the first cutterhead has a better ability to drill through the soil layer than the second cutterhead, while the second cutterhead has a better ability to break up the soil layer than the first cutterhead. The first and second cutterheads are set to be staggered front and back. When excavating the tunnel, the first cutterhead can contact the soil layer first and drill through it to loosen the soil layer structure. Then the second cutterhead contacts the soil layer and can easily break up the soil layer to form the required tunnel structure. The machine body has a screw conveyor on its rear end face and a feed inlet on its front end face. The feed inlet is located close to the bottom of the machine body on the front end face. The feed end of the screw conveyor extends from the rear end face of the machine body into the feed inlet. The motor end of the screw conveyor is located outside the rear end face of the machine body. A discharge outlet is located on the side wall outside the rear end face of the screw conveyor. This screw conveyor design allows soil excavated by the first and second cutter heads to be sucked into the feed end of the screw conveyor from the feed inlet and discharged from the discharge outlet when the machine starts working. This new type of rectangular pipe jacking machine is a large piece of equipment capable of excavating large underground tunnels; however, it cannot complete construction tasks independently when the cross-section of the underground tunnel is even larger. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a small earth pressure balance pipe jacking machine that can work with large equipment to excavate underground tunnels with ultra-large cross-sections.

[0004] To achieve the above objectives, the technical solution adopted by this utility model of a small earth pressure balance pipe jacking machine is as follows:

[0005] A small earth pressure balance pipe jacking machine includes a shell, a soil chamber at the front of the shell, and four cutterheads on the front side of the soil chamber. The four cutterheads are arranged in two rows, with two cutterheads in the upper row and two cutterheads in the lower row. A drive mechanism for rotating the cutterheads is installed inside the shell. The drive shaft of the drive mechanism extends out of the soil chamber and is fixedly connected to the cutterheads. A soil discharge port is provided on the bottom surface of the soil chamber between each drive mechanism. A auger soil discharger is installed at the soil discharge port. At least one pair of cutterheads located diagonally have stirring rods on their backs for feeding soil from the soil chamber into the soil discharge port.

[0006] Preferably, a cone plate is provided on the inner wall of the soil chamber at the blind zone of the cutterhead.

[0007] Preferably, adjacent blades are staggered, with the stirring rod positioned on the back of a pair of blades located diagonally opposite each other at the rear.

[0008] Preferably, the shell has a trapezoidal cross-section, with the diameters of the two upper cutter discs being smaller than those of the two lower cutter discs. This allows for the cutting of small trapezoidal cross-sections.

[0009] Preferably, the shell has a square cross-section, and the diameters of the two upper cutter discs are equal to the diameters of the two lower cutter discs. This allows for the cutting of small square cross-sections.

[0010] Compared with the prior art, this utility model has the following advantages:

[0011] 1. The soil discharge port is set between the four drive mechanisms, and the four cutter heads are naturally arranged around the soil discharge port. At least one pair of cutter heads on the diagonal are equipped with stirring rods on their backs, so that this utility model can carry out excavation and soil discharge work regardless of the angle. That is, it can excavate the edge of the super large cross section step by step, and then use large equipment to excavate the remaining part, thereby excavating the underground passage of the super large cross section.

[0012] 2. The cone plate located in the cutter head blind zone of the earth chamber can reduce the cutting blind zone of each cutter head.

[0013] 3. The staggered arrangement of adjacent cutterheads can optimize cutting efficiency, reduce construction resistance, and improve soil stability. Attached Figure Description

[0014] Figure 1 This is a side view of one embodiment of the small earth pressure balance pipe jacking machine of this utility model.

[0015] Figure 2 This is a front view of one embodiment of the small earth pressure balance pipe jacking machine of this utility model.

[0016] Figure 3 This is a front view of Embodiment 2 of the small earth pressure balance pipe jacking machine of this utility model.

[0017] Figure 4 This is a schematic diagram of the work of excavating a large-scale underground passage using this utility model.

[0018] The components include: 1. shell, 2. soil chamber, 3. cutter head, 4. cone plate, 5. water spray pipe, 6. drive mechanism, 7. soil discharge port, 8. spiral soil discharge machine, and 9. mixing rod. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0020] Example 1, as Figure 1-2 As shown, a small earth pressure balance pipe jacking machine includes a shell 1 with a trapezoidal cross-section. A soil chamber 2 is located at the front of the shell, and four cutterheads 3 are positioned on the front side of the soil chamber. The four cutterheads are arranged in two rows, with two cutterheads in the upper row and two in the lower row. The diameter of the two cutterheads in the upper row is smaller than that of the two cutterheads in the lower row to match the trapezoidal shell and cut out small trapezoidal cross-sections. Adjacent cutterheads are staggered. The two cutterheads on the front diagonal pair can first drill through the soil layer, loosening its structure, while the two cutterheads on the rear diagonal pair can break up the soil layer, thereby optimizing cutting efficiency, reducing construction resistance, and improving soil quality. For stability, a cone plate 4 is installed on the inner wall of the soil chamber in the blind zone of the cutterhead. If space permits, a water spray pipe 5 can be installed on the cone plate. The water spray pipe is connected to high-pressure water to assist the cone plate in breaking the soil in the cutting blind zone of the cutterhead, which can minimize the cutting blind zone. A drive mechanism 6 for driving the cutterhead to rotate is installed inside the housing. The drive mechanism is existing technology in this field, and the specific structure will not be described in detail. The drive shaft of the drive mechanism extends out of the soil chamber and is fixed to the cutterhead. A soil discharge port 7 is set on the bottom surface of the soil chamber between each drive mechanism. A spiral soil discharge machine 8 is set at the soil discharge port. A stirring rod 9 is installed on the back of a pair of cutterheads on the rear diagonal side to send the soil in the soil chamber into the soil discharge port.

[0021] Example 2, as Figure 3 As shown, the difference from Embodiment 1 is that the shell is square, and the diameter of the two upper cutter discs is equal to the diameter of the two lower cutter discs, which can cut out small square cross-sections.

[0022] The specific working process and principle of a small earth pressure balance pipe jacking machine: such as Figure 4 As shown, for underground passages with ultra-large cross-sections, this invention can be used to first excavate an annular cross-section, reinforce it, and then use large equipment to excavate the soil within the annular cross-section, thereby excavating the ultra-large cross-section underground passage. Regardless of its position within the annular cross-section, this invention always has a cutterhead with a stirring rod positioned below and close to the soil chamber. This stirring rod transports the soil debris that falls to the bottom of the soil chamber after being cut by the cutterhead to the discharge port, where it is then discharged backward by a screw conveyor, ensuring smooth soil discharge.

Claims

1. A small earth pressure balance pipe jacking machine, characterized in that: The device includes a shell, a soil chamber at the front of the shell, and four cutterheads on the front side of the soil chamber. The four cutterheads are arranged in two rows, with two cutterheads in the upper row and two cutterheads in the lower row. A drive mechanism for rotating the cutterheads is installed inside the shell. The drive shaft of the drive mechanism extends out of the soil chamber and is fixedly connected to the cutterheads. A soil discharge port is provided on the bottom surface of the soil chamber between each drive mechanism. A spiral soil discharge machine is installed at the soil discharge port. At least one pair of cutterheads located diagonally have stirring rods on their backs for feeding the soil and debris in the soil chamber into the soil discharge port.

2. The small earth pressure balance pipe jacking machine according to claim 1, characterized in that: A cone plate is installed on the inner wall of the soil chamber in the blind zone of the cutterhead.

3. The small earth pressure balance pipe jacking machine according to claim 2, characterized in that: The adjacent blades are staggered, with the stirring rod positioned on the back of the pair of blades located diagonally opposite each other at the rear.

4. The small earth pressure balance pipe jacking machine according to claim 3, characterized in that: The shell has a trapezoidal cross-section, and the diameter of the two cutter discs in the upper row is smaller than the diameter of the two cutter discs in the lower row.

5. The small earth pressure balance pipe jacking machine according to claim 3, characterized in that: The shell has a square cross-section, and the diameters of the two upper cutter discs are equal to the diameters of the two lower cutter discs.

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