CN118564258A - A pipe jacking construction device for muddy sand layer using pipe jacking method - Google Patents

Abstract

The present invention relates to the technical field of pipe jacking machines, and specifically to a pipe jacking construction device for a silty sand layer using a pipe jacking propulsion method; the device comprises a machine body, a cutter disc is fixedly mounted on one side of the machine body; a soil pressure bin is provided on a side of the machine body close to the cutter disc; a screw conveyor is installed inside the machine body; the screw conveyor is used to transport the sand in the soil pressure bin; the present invention arranges a booster cylinder; the booster cylinder can be fixed in the tunnel through a positioning plate; thereby, in the process of the booster cylinder pushing the machine body to excavate the tunnel through a hydraulic push rod; the positioning plate inserted into the inner wall of the tunnel can provide sufficient supporting force for the booster cylinder; the hydraulic push rod can push the machine body to drive the cutter disc to excavate the tunnel during the installation of the next pipe jacking; the earth pressure balance pipe jacking machine can still perform excavation work normally during the installation of the pipe jacking; the construction period is greatly saved; the construction efficiency of the earth pressure balance pipe jacking machine is improved; and the practicability of the present invention is effectively improved.

Description

A pipe jacking construction device for muddy sand layer using pipe jacking method

Technical Field

The invention relates to the technical field of pipe jacking machines, in particular to a pipe jacking construction device for a muddy sand layer using a pipe jacking propulsion method.

Background Art

Pipe jacking construction is a trenchless construction method, which is a pipe burying construction technology with no excavation or less excavation. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the working pit to overcome the friction between the jacking pipe and the surrounding soil, push the jacking pipe into the soil according to the designed slope, and transport the soil away. After one section of the pipe is pushed into the soil layer, the second section of the pipe is pushed in. The principle is to use the thrust of the main jacking cylinder and the jacking room, relay room, etc. to push the jacking machine from the working pit through the soil layer and lift it into the receiving pit. The jacking pipe is buried between the two pits following the jacking machine.

Among them, the earth pressure balance pipe jacking machine is a type of pipe jacking machine widely used in underground construction, especially suitable for pipe jacking construction in silty sandy soil layers; the earth pressure balance pipe jacking machine is based on the basic principle of earth pressure balance; when the earth pressure balance pipe jacking machine is working, the main jacking oil cylinder in the working well first pushes the earth pressure balance pipe jacking machine forward, and at the same time, the large cutter head rotates to cut the soil, and the cut soil enters the sealed soil bin and the screw conveyor, and is squeezed to form a compressed soil with a certain soil pressure; after the screw conveyor rotates, the cut soil is transported out;

When the cutter head of an existing earth pressure balance pipe jacking machine is excavating at a construction site, the main jacking cylinder needs to push the earth pressure balance pipe jacking machine forward in the excavated tunnel through the jacking pipe. After one jacking pipe is pushed into the tunnel, the next jacking pipe needs to be installed to continue to push the earth pressure balance pipe jacking machine forward. The installation of the next jacking pipe consumes a certain amount of time, which makes it impossible for the earth pressure balance pipe jacking machine to perform excavation work normally during the installation of the jacking pipe, thereby extending the construction period of the entire earth pressure balance pipe jacking machine and greatly reducing the construction efficiency of the earth pressure balance pipe jacking machine.

In view of this, in order to overcome the above technical problems, the present invention proposes a silty sand layer jacking pipe construction device using a jacking pipe propulsion method, which solves the above technical problems.

Summary of the invention

In order to make up for the deficiencies of the prior art, the present invention proposes a silty sand layer pipe jacking construction device using a pipe jacking propulsion method. The present invention arranges a booster cylinder, which enables the booster cylinder to be fixed in the tunnel through a positioning plate. Therefore, in the process of the booster cylinder pushing the machine body to excavate the tunnel through the hydraulic push rod, the positioning plate inserted into the inner wall of the tunnel can provide sufficient supporting force for the booster cylinder. The hydraulic push rod can push the machine body to drive the cutter disc to excavate the tunnel during the installation of the next pipe jacking. The earth pressure balance pipe jacking machine can still perform excavation work normally during the installation of the pipe jacking machine, which greatly saves the construction period, improves the construction efficiency of the earth pressure balance pipe jacking machine, and effectively improves the practicability of the present invention.

The technical solution adopted by the present invention to solve the technical problem is: a silty sand layer jacking construction device of a jacking method of jacking pipe according to the present invention comprises:

A machine body, a cutter disc is fixedly installed on one side of the machine body; a soil pressure bin is provided on a side of the machine body close to the cutter disc; a screw conveyor is installed inside the machine body; the screw conveyor is used to transport the sand in the soil pressure bin; a drive motor is fixedly installed inside the machine body; the drive motor is used to drive the cutter disc to rotate;

A booster cylinder, which is located on a side of the machine body away from the cutter disc; the booster cylinder is slidably connected to the machine body; a hydraulic push rod is fixedly installed on the inner wall of the booster cylinder; one end of the hydraulic push rod away from the booster cylinder is fixedly connected to the machine body; a positioning module is fixedly installed on the side wall of the booster cylinder; the positioning module is used to fix the booster cylinder in the tunnel.

Preferably, the positioning module includes:

A fixing block; the fixing block is fixedly connected to the inner wall of the booster cylinder; the end of the hydraulic push rod away from the body is fixedly connected to the fixing block; the end of the fixing block close to the booster cylinder is provided with a positioning groove penetrating the outer wall of the booster cylinder; a positioning plate is slidingly and sealingly connected in the positioning groove;

The screw is rotated at the bottom of the positioning groove; a spiral groove is provided on a side of the positioning plate close to the screw; one end of the screw away from the positioning groove is spirally connected in the spiral groove; and the drive motor drives the screw to rotate through a transmission unit.

Preferably, the transmission unit includes a transmission rod; a cavity is opened in the fixed block; the transmission rod and the driving motor are connected by a transmission belt; the positioning plate is rotatably connected to a bevel gear shaft on a side close to the transmission rod; the end of the screw rod away from the positioning plate is fixedly connected to a bevel gear; the bevel gear shaft and the bevel gear are meshed and transmitted in the cavity; the transmission rod is used to drive the bevel gear shaft to rotate.

Preferably, one end of the transmission rod close to the bevel gear shaft is fixedly connected with a driving gear; the surface of the bevel gear shaft is slidably connected with a bevel gear ring; the bevel gear ring is fixedly connected to the inner wall of the cavity by a supporting spring; the inner wall of the cavity is inlaid with an electromagnetic ring facing the bevel gear ring; the driving gear is used to drive the bevel gear ring to rotate.

Preferably, an acceleration gear is provided between the driving gear and the bevel gear ring; the acceleration gear meshes with the driving gear for transmission; a transmission gear is fixedly connected to a side of the acceleration gear close to the bevel gear ring; the transmission gear meshes with the bevel gear ring for transmission.

Preferably, a storage groove is provided on a side of the booster cylinder close to the body; an airbag is fixedly installed in the storage groove; an end of the airbag away from the storage groove is fixedly connected to the body; and an air hole connected to the airbag is provided on the inner wall of the booster cylinder.

Preferably, an exhaust port is provided on one side of the machine body close to the booster cylinder; the exhaust port is communicated with the airbag; and a one-way valve is installed in both the exhaust port and the air hole.

Preferably, a support rod is provided in the airbag; one end of the support rod is fixedly connected to the bottom of the storage tank; a circular groove is provided at the end of the support rod away from the storage tank; a connecting rod is slidably connected in the circular groove; the end of the connecting rod away from the support rod is fixedly connected to the body; a through groove connected to the exhaust port is provided inside the connecting rod; the end of the through groove away from the exhaust port passes through the support rod and is connected to the storage tank.

The beneficial effects of the present invention are as follows:

1. The present invention arranges a booster cylinder, so that the booster cylinder can be fixed in the tunnel through a positioning plate. Therefore, when the booster cylinder pushes the machine body to dig the tunnel through the hydraulic push rod, the positioning plate inserted into the inner wall of the tunnel can provide sufficient supporting force for the booster cylinder. The hydraulic push rod can push the machine body to drive the cutter disc to dig the tunnel during the installation of the next jacking pipe. The earth pressure balance pipe jacking machine can still perform the digging work normally during the installation of the jacking pipe. The construction period is greatly saved, the construction efficiency of the earth pressure balance pipe jacking machine is improved, and the practicality of the present invention is effectively improved.

2. The present invention sets an acceleration gear, which makes the number of revolutions of the acceleration gear smaller than that of the transmission gear, thereby accelerating the rotation speed of the acceleration gear. Since the transmission gear is fixedly connected and coaxial with the acceleration gear, the acceleration gear with the accelerated rotation speed can drive the transmission gear fixedly connected thereto to rotate quickly, thereby accelerating the speed at which the transmission gear drives the bevel gear shaft through the bevel gear ring, thereby accelerating the speed at which the bevel gear shaft drives the bevel gear, thereby accelerating the speed at which the screw drives the positioning plate to extend out and enter the positioning groove, saving the time for fixing and separating the booster tube from the tunnel, and effectively improving the construction efficiency of the earth pressure balance pipe jacking machine.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

Fig. 1 is a perspective view of the present invention;

Fig. 2 is a schematic structural diagram of the present invention;

Fig. 3 is an enlarged view of point A in Fig. 2;

FIG4 is an enlarged view of point B in FIG2;

Fig. 5 is a rear view of the present invention;

FIG6 is a transmission stereogram of the bevel gear used in the present invention;

In the figure: 1. body; 11. cutter head; 12. soil pressure bin; 13. screw conveyor; 14. drive motor; 15. hydraulic push rod; 16. exhaust port; 17. one-way valve; 2. booster cylinder; 21. fixing block; 211. positioning groove; 212. positioning plate; 213. screw rod; 214. spiral groove; 215. bevel gear; 22. transmission rod; 221. transmission belt; 222. driving gear; 23. cavity; 231. bevel gear shaft; 232. bevel gear ring; 233. support spring; 234. electromagnetic ring; 24. acceleration gear; 241. transmission gear; 25. storage tank; 251. air bag; 252. support rod; 253. circular groove; 254. connecting rod; 255. through groove; 26. air hole.

DETAILED DESCRIPTION

In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

As shown in FIGS. 1 to 6 , a pipe jacking construction device for a muddy sand layer using a pipe jacking method according to the present invention comprises:

A machine body 1, a cutter disc 11 is fixedly mounted on one side of the machine body 1; a soil pressure bin 12 is provided on a side of the machine body 1 close to the cutter disc 11; a screw conveyor 13 is installed inside the machine body 1; the screw conveyor 13 is used to transport the sand in the soil pressure bin 12; a drive motor 14 is fixedly mounted inside the machine body 1; the drive motor 14 is used to drive the cutter disc 11 to rotate;

The booster cylinder 2 is located on a side of the machine body 1 away from the cutter disc 11; the booster cylinder 2 is slidably connected to the machine body 1; a hydraulic push rod 15 is fixedly installed on the inner wall of the booster cylinder 2; one end of the hydraulic push rod 15 away from the booster cylinder 2 is fixedly connected to the machine body 1; a positioning module is fixedly installed on the side wall of the booster cylinder 2; the positioning module is used to fix the booster cylinder 2 in the tunnel.

As an implementation manner of the present invention, the positioning module includes:

The fixing block 21 is fixedly connected to the inner wall of the booster cylinder 2; the end of the hydraulic push rod 15 away from the body 1 is fixedly connected to the fixing block 21; the end of the fixing block 21 close to the booster cylinder 2 is provided with a positioning groove 211 penetrating the outer wall of the booster cylinder 2; the positioning groove 211 is slidably and sealably connected with a positioning plate 212;

The screw 213 rotates at the bottom of the positioning groove 211; a spiral groove 214 is provided on a side of the positioning plate 212 close to the screw 213; one end of the screw 213 away from the positioning groove 211 is spirally connected in the spiral groove 214; the drive motor 14 drives the screw 213 to rotate through a transmission unit.

As an embodiment of the present invention, the transmission unit includes a transmission rod 22; a cavity 23 is opened in the fixed block 21; the transmission rod 22 and the drive motor 14 are connected by a transmission belt 221 for belt transmission; the positioning plate 212 is rotatably connected to a bevel gear shaft 231 on a side close to the transmission rod 22; the end of the screw rod 213 away from the positioning plate 212 is fixedly connected to a bevel gear 215; the bevel gear shaft 231 and the bevel gear 215 are meshed and transmitted in the cavity 23; the transmission rod 22 is used to drive the bevel gear shaft 231 to rotate.

As an embodiment of the present invention, the transmission rod 22 is fixedly connected to one end close to the bevel gear shaft 231 with a driving gear 222; the surface of the bevel gear shaft 231 is slidably connected with a bevel gear ring 232; the bevel gear ring 232 is fixedly connected to the inner wall of the cavity 23 via a support spring 233; the inner wall of the cavity 23 is inlaid with an electromagnetic ring 234 that is opposite to the bevel gear ring 232; the driving gear 222 is used to drive the bevel gear ring 232 to rotate.

As an embodiment of the present invention, an acceleration gear 24 is provided between the driving gear 222 and the bevel gear ring 232; the acceleration gear 24 is meshed with the driving gear 222 for transmission; a transmission gear 241 is fixedly connected to a side of the acceleration gear 24 close to the bevel gear ring 232; the transmission gear 241 is meshed with the bevel gear ring 232 for transmission;

When the cutter head 11 of the existing earth pressure balance pipe jacking machine is excavating at the construction site, the main jacking oil cylinder needs to push the earth pressure balance pipe jacking machine forward in the excavated tunnel through the jacking pipe. After a jacking pipe is pushed into the tunnel, the next jacking pipe needs to be installed to continue to push the earth pressure balance pipe jacking machine forward; and the installation of the next jacking pipe consumes a certain amount of time; so that the earth pressure balance pipe jacking machine cannot perform excavation work normally during the installation of the jacking pipe, thereby extending the construction period of the entire earth pressure balance pipe jacking machine; greatly reducing the construction efficiency of the earth pressure balance pipe jacking machine;

During operation, first install the main jacking cylinder in the working pit; then hoist the earth pressure balance pipe jacking machine into the working pit; make the body 1 of the earth pressure balance pipe jacking machine located on one side of the main jacking cylinder, and make the cutter head 11 of the earth pressure balance pipe jacking machine face the direction of another working pit for construction; then control the main jacking cylinder to push the body 1 to move towards the inner wall of the working pit by pushing the booster cylinder 2; make the body 1 drive the cutter head 11 to contact the inner wall of the working pit, and at this time, the drive motor 14 drives the cutter head 11 to rotate; make the cutter head 11 cut the inner wall of the working pit to form a tunnel; because in the initial state, the electromagnetic ring 234 is in the power-off state The bevel gear ring 232 is supported by the support spring 233 and is located on one side of the transmission gear 241. At this time, the transmission gear 241 is separated from the bevel gear ring 232 and is not in a meshing state. Therefore, during the process of the drive motor 14 driving the cutter head 11 to rotate, although the drive motor 14 can drive the transmission rod 22 to rotate through the transmission belt 221, the transmission rod 22 cannot drive the bevel gear ring 232 to rotate through the drive gear 222 and the transmission gear 241. Therefore, the positioning plate 212 located in the positioning groove 211 will not extend out of the positioning groove 211 at this time, so as to prevent the positioning plate 212 from blocking the booster cylinder 2 from entering the tunnel.

As the machine body 1 is pushed by the main jacking cylinder and continuously drills, the machine body 1 drives the cutter head 11 to squeeze the cut sand and soil, so that the cut sand and soil are squeezed into the soil pressure bin 12. Since a screw conveyor 13 connected to the soil pressure bin 12 is installed in the machine body 1, the screw conveyor 13 can discharge the sand and soil in the soil pressure bin 12. In order to facilitate the screw conveyor 13 to discharge the sand and soil in the soil pressure bin 12, the staff often adds a water pump in the machine body 1, so that the water pump washes the sand and soil in the soil pressure bin 12, making the sand and soil soft and easy to discharge. With the push of the main jacking cylinder, the machine The machine body 1 will continue to drill through the cutter head 11; when the main jacking oil cylinder has reached its maximum extension, the main jacking oil cylinder is controlled to retract; at this time, a section of jacking pipe is hoisted into the working pit; the jacking pipe is located between the main jacking oil cylinder and the booster cylinder 2; the main jacking oil cylinder can push the booster cylinder 2 to move away from the main jacking oil cylinder through the jacking pipe; the booster cylinder 2 pushes the machine body 1 and the cutter head 11 to continue drilling; until the main jacking oil cylinder has reached its maximum extension; at this time, the section of jacking pipe pushes the booster cylinder 2 to completely enter the tunnel drilled by the machine body 1; since the depth of the booster cylinder 2 entering the tunnel is limited at this time; so when the first section of jacking pipe and the main A section of jacking pipe is hoisted between the jacking cylinders; the main jacking cylinder pushes the booster cylinder 2 into the tunnel continuously through the two sections of jacking pipe; the depth of the booster cylinder 2 entering the tunnel increases; when the main jacking cylinder reaches the maximum extension, the main jacking cylinder is reset; and the outside staff continue to hoist the jacking pipe into the working pit, but at this time the operator of the earth pressure balance pipe jacking machine can directly control the electromagnetic ring 234 to be energized; the electromagnetic ring 234 can absorb the bevel gear ring 232 to squeeze the support spring 233 and approach the transmission gear 241; the transmission gear 241 is meshed with the bevel gear ring 232; at this time, the control The drive motor 14 is forced to rotate in the opposite direction; the drive motor 14 rotating in the opposite direction can drive the transmission rod 22 to rotate through the transmission belt 221; the transmission rod 22 can drive the driving gear 222 fixed on the surface to rotate; since the driving gear 222 is meshed with the acceleration gear 24; and the acceleration gear 24 is fixedly connected to the transmission gear 241; the driving gear 222 drives the bevel gear ring 232 to rotate by driving the acceleration gear 24 and the transmission gear 241; the bevel gear ring 232 can drive the bevel gear shaft 231 to which it is slidably connected to rotate synchronously; since the bevel gear shaft 231 is meshed with the bevel gear shaft 231, the bevel gear shaft 231 is meshed with the bevel gear shaft 231. The bevel gear shaft 231 is meshed with the bevel gear 215, so that the bevel gear 215 can drive the screw 213 connected thereto to rotate. Since the screw 213 is spirally connected in the spiral groove 214, the rotating screw 213 can continuously extend out of the spiral groove 214 relative to the positioning plate 212. As a result, the positioning plate 212 is pushed by the screw 213 and continuously extends out of the positioning groove 211. The positioning plate 212 extending out of the positioning groove 211 can be inserted into the sand on the inner wall of the tunnel. At this time, the booster cylinder 2 is fixed in the tunnel. Then the electromagnetic ring is controlled 234 is powered off; the bevel gear ring 232 can be reset under the push of the restoring force of the support spring 233; at this time, the bevel gear ring 232 is separated from the transmission gear 241; the drive motor 14 is controlled to rotate forward; the forward-rotating drive motor 14 can drive the cutter head 11 to cut; and at this time, the hydraulic push rod 15 is controlled to extend; the hydraulic push rod 15 can push the machine body 1 to move away from the booster cylinder 2; the machine body 1 pushes the cutter head 11 to continue drilling; until the installation in the jacking pit is completed; the electromagnetic ring 234 is controlled to be powered on again; at this time, the forward-rotating drive motor 14 drives the screw rod 213 to rotate in the opposite direction, so that the screw rod 213 spirally enters the spiral groove 214, so that the screw rod 213 in the spiral groove 214 pushes the positioning plate 212 into the positioning groove 211 through the groove wall of the spiral groove 214, so that the booster cylinder 2 is no longer fixed to the inner wall of the tunnel through the positioning plate 212; at this time, the main jacking oil cylinder is controlled to push the booster cylinder 2 to continuously enter through the jacking pipe; while the main jacking oil cylinder is continuously extended, the hydraulic push rod 15 is continuously extended and retracted, so that the booster cylinder 2 can continuously approach the machine body 1, until the booster cylinder 2 contacts the machine body 1; then the main jacking oil cylinder pushes the booster cylinder through the jacking pipe The push cylinder 2 drives the machine body 1 to continue drilling into the tunnel; and there is no positioning plate 212; when the booster cylinder 2 pushes the machine body 1, the cutter head 11 blocked by the sand will generate a blocking force on the booster cylinder 2 through the machine body 1; so that the booster cylinder 2 pushes the jacking pipe backward to extend out of the tunnel under the action of the blocking force; so the booster cylinder 2 pushes the machine body 1 through the hydraulic push rod 15 to excavate the tunnel; the positioning plate 212 inserted into the inner wall of the tunnel can provide sufficient support for the booster cylinder 2; to ensure that the booster cylinder 2 pushes the machine body 1 through the hydraulic push rod 15 to drive the cutter head 11 to excavate the tunnel during the installation of the next jacking pipe;

Since the earth pressure balance pipe jacking machine works in a sand layer, it is inevitable that sand will enter the machine body 1, and the transmission gear 241 and the bevel gear ring 232; the drive gear 222 and the acceleration gear 24 are all meshing transmissions; if the transmission elements such as the transmission gear 241, the bevel gear ring 232, the drive gear 222 and the acceleration gear 24 are exposed to the outside of the fixed block 21, the sand will fall into the meshing gap of the transmission elements such as the transmission gear 241, the bevel gear ring 232, the drive gear 222 and the acceleration gear 24, thereby causing wear on the transmission elements, thereby reducing the service life; therefore, the present invention provides a cavity 23 in the fixed block 21, so that the transmission elements are all located in the cavity 23, thereby avoiding the entry of external sand, thereby ensuring the service life of the transmission elements such as the transmission gear 241, the bevel gear ring 232, the drive gear 222 and the acceleration gear 24;

Since the drive motor 14 drives the cutter disc 11 to rotate, in order to ensure that the drive motor 14 has a certain driving force to drive the cutter disc 11 to cut the soil; because too high a rotation speed will cause excessive wear of the cutter, overload and vibration of the equipment, and will also affect the cutting effect and construction safety; the driving speed of the drive motor 14 will not be too fast, so as to ensure that sufficient force and cutting effect are provided; and by setting the acceleration gear 24; the number of revolutions of the acceleration gear 24 is less than that of the transmission gear 241; thereby accelerating the rotation speed of the acceleration gear 24; since the transmission gear 241 is fixedly connected and coaxial with the acceleration gear 24; the accelerated rotation speed of the acceleration gear 24 can drive the transmission gear 241 fixedly connected thereto to rotate quickly; so that the transmission gear 241 drives the bevel gear shaft 231 through the bevel gear ring 232 to accelerate the speed; thereby, the bevel gear shaft 231 drives the bevel gear 215 to accelerate the speed; thereby accelerating the speed at which the screw 213 drives the positioning plate 212 to extend and enter the positioning groove 211; saving the time for fixing and separating the booster tube 2 from the tunnel; thereby effectively improving the construction efficiency of the earth pressure balance pipe jacking machine;

The present invention sets a booster cylinder 2, which enables the booster cylinder 2 to be fixed in the tunnel through a positioning plate 212. Therefore, when the booster cylinder 2 pushes the machine body 1 to excavate the tunnel through the hydraulic push rod 15, the positioning plate 212 inserted into the inner wall of the tunnel can provide sufficient supporting force for the booster cylinder 2. The hydraulic push rod 15 can push the machine body 1 to drive the cutter head 11 to excavate the tunnel during the installation of the next jacking pipe. The earth pressure balance pipe jacking machine can still perform the excavation work normally during the installation of the jacking pipe, which greatly saves the construction period and improves the construction efficiency of the earth pressure balance pipe jacking machine. The practicality of the present invention is effectively improved.

As an embodiment of the present invention, a storage groove 25 is provided on a side of the booster cylinder 2 close to the body 1; an airbag 251 is fixedly installed in the storage groove 25; one end of the airbag 251 away from the storage groove 25 is fixedly connected to the body 1; and an air hole 26 connected to the airbag 251 is provided on the inner wall of the booster cylinder 2.

As an embodiment of the present invention, an exhaust port 16 is provided on one side of the body 1 close to the booster cylinder 2 ; the exhaust port 16 is communicated with the air bag 251 ; and a one-way valve 17 is installed in both the exhaust port 16 and the air hole 26 .

As an embodiment of the present invention, a support rod 252 is provided inside the airbag 251; one end of the support rod 252 is fixedly connected to the bottom of the storage tank 25; a circular groove 253 is provided at one end of the support rod 252 away from the storage tank 25; a connecting rod 254 is slidably connected in the circular groove 253; one end of the connecting rod 254 away from the support rod 252 is fixedly connected to the body 1; a through groove 255 connected to the exhaust port 16 is provided inside the connecting rod 254; one end of the through groove 255 away from the exhaust port 16 passes through the support rod 252 and is connected to the storage tank 25;

During operation, in the process of installing the next jacking pipe, the booster cylinder 2 pushes the machine body 1 to excavate in the tunnel. At this time, the machine body 1 is pushed and slides along the booster cylinder 2 in the direction close to the cutter head 11. At this time, a gap will be formed between the booster cylinder 2 and the machine body 1. At this time, the sand on the inner wall of the tunnel will easily fall into the gap between the booster cylinder 2 and the machine body 1. After the installation of the next jacking pipe is completed, the main jacking cylinder will push the booster cylinder 2 close to the machine body 1 through the jacking pipe. At this time, the gap between the booster cylinder 2 and the machine body 1 is constantly narrowing. In order to avoid the sand entering the gap from blocking the booster cylinder 2 and the machine body 1 from approaching each other, the present invention provides an air bag 251, and in the process of the hydraulic push rod 15 pushing the machine body 1 to excavate, the machine body 1 pulls the air bag 251 to move in the direction away from the storage tank 25. Since the end of the air bag 251 close to the bottom of the storage tank 25 is fixedly connected with a ring, and the ring is connected to the storage tank The storage groove 25 is slidably sealed and connected; and the support rod 252 is slidably connected to the ring; so the airbag 251 will pull the ring to slide along the support rod 252 to the notch of the storage groove 25; the ring is used to seal the storage groove 25; to prevent mud and sand from entering the storage groove 25; at this time, the airbag 251 extends out of the storage groove 25; so that the airbag 251 can block the sand and soil entering between the booster cylinder 2 and the body 1; thereby reducing the sand and soil entering between the booster cylinder 2 and the body 1; because the airbag 251 is a flexible rubber material; the sand and soil will squeeze the airbag 251 and cause the airbag 251 to deform; so by setting the support rod 252; the support rod 252 and the connecting rod 254 are located inside the airbag 251; so that the support rod 252 and the connecting rod 254 can support the airbag 251; to improve the strength of the airbag 251; to ensure the airbag 251 can effectively prevent a large amount of sand and soil from entering the gap between the booster cylinder 2 and the body 1; when the airbag 251 extends out of the storage groove 25, the gas in the body 1 will enter the storage groove 25 through the one-way valve 17 of the air hole 26; because the connecting rod 254 is fixedly connected to the body 1; the body 1 will pull the connecting rod 254 to extend out of the circular groove 253; so that the connecting rod 254 extending out of the circular groove 253 can effectively support the airbag 251 extending out of the storage groove 25; and when the main jacking cylinder pushes the booster cylinder 2 close to the body 1 through the jacking pipe, the airbag 251 is squeezed into the storage groove 25; at this time, the gas in the storage groove 25 enters the exhaust port 16 through the through groove 255 and is discharged from the exhaust port 16; so that the gas ejected from the exhaust port 16 can blow to the gap between the booster cylinder 2 and the body 1; so that the sand and soil on the surface of the airbag 251 will be blown away by the airflow Blown out of the gap between the booster cylinder 2 and the machine body 1; if the sand and soil falling on the surface of the air bag 251 is dry or agglomerated, it will make the airflow discharged from the exhaust port 16 difficult to blow; in this regard, the user can connect the air hole 26 to the water pump through a water pipe; so that the water pump fills water into the exhaust port 16; so that the water flow can be sprayed out through the air bag 251 and the exhaust port 16; so that the sprayed water flow can dilute the sand and soil falling on the surface of the air bag 251; and the diluted sand and soil will be flushed out of the gap between the booster cylinder 2 and the machine body 1 by water; to ensure the cleanliness of the gap between the booster cylinder 2 and the machine body 1, and the water flow discharged from the exhaust port 16 can moisten the inner wall layer of the tunnel close to the booster cylinder 2; thereby improving the lubricity of the inner wall of the tunnel; facilitating the main jacking cylinder to push the booster cylinder 2 quickly close to the machine body 1 through the jacking pipe; thereby effectively improving the actual application effect of the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in FIG1 , and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; in addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (8)

1. A pipe jacking construction device for a muddy sand layer using a pipe jacking method, comprising: A machine body (1), a cutter disc (11) is fixedly mounted on one side of the machine body (1); a soil pressure bin (12) is provided on a side of the machine body (1) close to the cutter disc (11); a screw conveyor (13) is installed inside the machine body (1); the screw conveyor (13) is used to transport sand in the soil pressure bin (12); a drive motor (14) is fixedly mounted inside the machine body (1); the drive motor (14) is used to drive the cutter disc (11) to rotate; the characteristics are: A booster cylinder (2), the booster cylinder (2) being located on a side of the machine body (1) away from the cutter disc (11); the booster cylinder (2) being slidably connected to the machine body (1); a hydraulic push rod (15) being fixedly mounted on the inner wall of the booster cylinder (2); one end of the hydraulic push rod (15) away from the booster cylinder (2) being fixedly connected to the machine body (1); a positioning module being fixedly mounted on the side wall of the booster cylinder (2); the positioning module being used to fix the booster cylinder (2) in the tunnel. 2. According to the silty sand layer jacking construction device of the jacking method of claim 1, it is characterized in that: the positioning module comprises: A fixing block (21); the fixing block (21) is fixedly connected to the inner wall of the booster cylinder (2); the end of the hydraulic push rod (15) away from the machine body (1) is fixedly connected to the fixing block (21); the end of the fixing block (21) close to the booster cylinder (2) is provided with a positioning groove (211) penetrating the outer wall of the booster cylinder (2); a positioning plate (212) is slidably and sealably connected in the positioning groove (211); A screw rod (213) is rotated at the bottom of the positioning groove (211); a spiral groove (214) is formed on a side of the positioning plate (212) close to the screw rod (213); an end of the screw rod (213) away from the positioning groove (211) is spirally connected in the spiral groove (214); and the drive motor (14) drives the screw rod (213) to rotate through a transmission unit. 3. A silty sand layer jacking construction device of a jacking method according to claim 2, characterized in that: the transmission unit includes a transmission rod (22); a cavity (23) is opened in the fixed block (21); the transmission rod (22) and the drive motor (14) are connected by a belt transmission through a transmission belt (221); a bevel gear shaft (231) is rotatably connected to a side of the positioning plate (212) close to the transmission rod (22); a bevel gear (215) is fixedly connected to one end of the screw rod (213) away from the positioning plate (212); the bevel gear shaft (231) and the bevel gear (215) are meshed and transmitted in the cavity (23); the transmission rod (22) is used to drive the bevel gear shaft (231) to rotate. 4. A silty sand layer jacking construction device using a jacking method according to claim 3, characterized in that: one end of the transmission rod (22) close to the bevel gear shaft (231) is fixedly connected with a driving gear (222); a bevel gear ring (232) is slidably connected to the surface of the bevel gear shaft (231); the bevel gear ring (232) is fixedly connected to the inner wall of the cavity (23) by a supporting spring (233); the inner wall of the cavity (23) is inlaid with an electromagnetic ring (234) that is opposite to the bevel gear ring (232); the driving gear (222) is used to drive the bevel gear ring (232) to rotate. 5. A silty sand layer jacking pipe construction device using a jacking pipe propulsion method according to claim 4, characterized in that: an acceleration gear (24) is provided between the driving gear (222) and the bevel gear ring (232); the acceleration gear (24) and the driving gear (222) are meshed for transmission; a transmission gear (241) is fixedly connected to a side of the acceleration gear (24) close to the bevel gear ring (232); the transmission gear (241) and the bevel gear ring (232) are meshed for transmission. 6. A silty sand layer jacking construction device using a jacking method according to claim 5, characterized in that: a storage groove (25) is provided on a side of the booster cylinder (2) close to the machine body (1); an air bag (251) is fixedly installed in the storage groove (25); the end of the air bag (251) away from the storage groove (25) is fixedly connected to the machine body (1); and an air hole (26) connected to the air bag (251) is provided on the inner wall of the booster cylinder (2). 7. A silty sand layer jacking construction device using a jacking method according to claim 6, characterized in that: an exhaust port (16) is provided on one side of the machine body (1) close to the booster cylinder (2); the exhaust port (16) is connected to the air bag (251); and a one-way valve (17) is installed in both the exhaust port (16) and the air hole (26). 8. A silty sand layer jacking construction device using a jacking method according to claim 7, characterized in that: a support rod (252) is provided inside the air bag (251); one end of the support rod (252) is fixedly connected to the bottom of the storage tank (25); a circular groove (253) is provided at the end of the support rod (252) away from the storage tank (25); a connecting rod (254) is slidably connected in the circular groove (253); the end of the connecting rod (254) away from the support rod (252) is fixedly connected to the body (1); a through groove (255) connected to the exhaust port (16) is provided inside the connecting rod (254); the end of the through groove (255) away from the exhaust port (16) passes through the support rod (252) and is connected to the storage tank (25).