Earth pressure balance shield tunneling machine for providing slurry pressure based on waste fine silt

Abstract

The invention relates to an earth pressure balance shield tunneling machine for providing slurry pressure based on waste fine silt. The earth pressure balance shield tunneling machine comprises a tunneling cutterhead, a slurry cabin, a soil cabin and a transportation cabin which are sequentially arranged from front to back. The slurry preparation and injection integrated system is arranged in the transportation cabin and is used for preparing and injecting a wall back grouting material and improved slurry; a foam injection system and a bidirectional belt conveyor; the foam injection system is arranged in the transportation cabin and is used for generating and injecting foam required by soil body improvement; the two-way belt conveyor is arranged in the transportation cabin and is used for conveying modifier raw materials and discharging waste muck; the conveying mechanism is arranged in the conveying cabin, the conveying starting end is located in the soil cabin, and the conveying tail end is located on the two-way belt conveyor. According to the invention, the combined action of slurry pressure and soil pressure can be realized to balance the water and soil pressure at the front end of a tunnel face in the tunneling process of the shield tunneling machine.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction, and in particular relates to an earth pressure balance shield machine that provides mud pressure based on waste fine mud. Background Art

[0002] The shield tunneling process generates a large amount of waste soil. Current waste soil treatment technologies can effectively recover and reuse coarse-grained soil, which can be used as fill material for roadbeds, foundation pits, and backfill projects, achieving resource utilization. However, the remaining fine mud is complex in composition and has relatively fine particles, making it difficult to handle. Furthermore, this fine mud contains harmful substances such as polycyclic aromatic hydrocarbons and heavy metals, which, if not promptly handled, can lead to environmental pollution and other problems. Therefore, effective solutions for the treatment and resource reuse of fine mud are still lacking.

[0003] When a traditional earth pressure balance shield machine is excavating in a high-water-pressure sandy soil stratum, the screw conveyor inside the shield machine is prone to bursting accidents due to the low content of fine particles in the stratum and the high head pressure. This makes it difficult to control the pressure in the soil compartment, which in turn affects the stability of the excavation face and the surrounding soil. Although the slurry pressure shield machine has precise pressure control capabilities and its slurry compartment is connected to the slurry pipe to avoid bursting accidents, it requires a larger ground space to install the slurry separation system, which is often not available during construction in urban environments. The dual-mode shield machine can combine the advantages of the above-mentioned two shield machines and can switch between earth pressure balance mode and slurry balance mode, but it is difficult to operate and the equipment cost is relatively high.

[0004] In summary, there is an urgent need for a new shield machine suitable for construction in high-water-pressure sandy soil strata to solve the problem of screw conveyor gushing, achieve precise control of soil compartment pressure, save construction period and cost, realize resource utilization of waste fine mud, and reduce the impact of slag on environmental pollution. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention provides an earth pressure balance shield machine (EPB) that uses waste fine mud to provide slurry pressure. This allows the combined action of slurry and soil pressure to balance the water and soil pressure at the front of the tunnel face during shield excavation. This invention not only solves the problem of screw conveyors gushing in high-water-pressure sandy soils, but also provides a way to recycle waste fine mud, reducing actual construction costs.

[0006] An earth pressure balance shield machine using waste fine mud to provide slurry pressure, comprising:

[0007] The tunneling cutterhead, mud chamber, soil chamber and transport chamber are arranged in sequence from front to back;

[0008] An integrated slurry preparation and injection system, provided in the transport cabin, for preparing and injecting back-wall grouting materials and improved slurry; a foam injection system and a bidirectional belt conveyor;

[0009] A foam injection system is provided in the transport cabin and is used to generate and inject foam required for soil improvement;

[0010] A bidirectional belt conveyor is provided in the transport cabin and is used for conveying the improver raw materials and discharging the waste soil;

[0011] The conveying mechanism is arranged in the transport cabin, with the conveying starting end located in the soil cabin and the conveying end located on the bidirectional belt conveyor.

[0012] The mud chamber is arranged near the excavation cutterhead and includes a chamber body, a plurality of mud supply ports are opened near the upper portion of the chamber wall, and mud inlet pipes are correspondingly provided at the mud supply ports; a mud discharge port is opened near the lower portion of the chamber wall, and mud outlet pipes are correspondingly provided at the mud discharge port; an integrated pressure / flow meter is installed on the mud inlet pipe;

[0013] A mud discharge port is provided at the bottom of the bulkhead of the mud tank, and a mud discharge pipe is provided at the mud discharge port to discharge excess mud to the conveying mechanism of the transport tank;

[0014] The bottom of the mud tank is provided with a slag discharge channel which is communicated with the mud tank.

[0015] A mud pressure sensor is provided inside the mud tank body to monitor the mud pressure in the mud tank in real time.

[0016] A plurality of supporting arms are circumferentially arranged in the middle of the mud compartment.

[0017] A spare pipe is provided at the middle and lower part of the mud chamber for discharging mud in a standby manner.

[0018] A mud compartment partition is provided between the mud compartment and the soil compartment, and the mud compartment partition is moved between the mud compartment and the soil compartment by a movable pulley group; the movable pulley group is arranged on the top of the mud compartment through a pulley support, driving the mud compartment partition to move, so as to transmit the mud compartment pressure to the tunnel face.

[0019] The soil cabin includes a cabin body, a central rotating shaft of the cabin body is connected to the excavation cutter disc, and a stirring rod is provided on the central rotating shaft; a pressure regulating device is provided in the soil cabin, and a soil cabin upper partition is provided at the end of the pressure regulating device. The soil cabin upper partition divides the cabin body of the soil cabin into two parts, the lower part is used to load the soil flowing in after the cutter disc is cut, and the upper part is used to load pressurized air; a soil pressure sensor is provided in the soil cabin to monitor the soil pressure in the mud cabin in real time.

[0020] The integrated mud preparation and injection system includes a bentonite storage tank, a mortar storage tank, and a fine mud storage tank. The bentonite storage tank and the mortar storage tank are connected by a pipeline. The connected bentonite storage tank, mortar storage tank, and fine mud storage tank are respectively connected to the grouting port of the closed mud mixing and stirring box. The mud transport pump is connected to the slurry outlet of the closed mud mixing and stirring box; the fine mud storage tank is connected to the raw material collection tank, and an integrated pressure / flow meter and valve are provided on the pipeline;

[0021] The bentonite storage tank and the mortar storage tank are connected by a pipeline. The connected bentonite storage tank and the mortar storage tank can achieve full mixing of mortar and bentonite for the preparation of back-wall grouting materials.

[0022] Grouting pipes are provided on both sides of the closed mud mixing and stirring box to respectively realize the injection of fine mud raw materials and mortar and bentonite raw materials as raw materials. After the raw materials are filled in the grouting pipes on both sides of the closed mud mixing and stirring box, water and powdered pumping agent are filled in for the preparation of mud improver.

[0023] The foam injection system includes a foam liquid storage tank, which is connected to the feed port of the foaming gun via a connecting hose and an air pressure supply device. A liquid injection pump is provided between the foam liquid storage tank and the foaming gun. The discharge port of the foaming gun sprays foam to the front of the tunnel face via a connecting hose, which is provided with a valve and an integrated pressure / flow meter.

[0024] The foaming gun is a variable aperture foaming gun, and both ends of the foaming gun are sealed by rubber plugs to prevent the foam liquid from leaking.

[0025] The bidirectional belt conveyor is a two-way conveyor with two layers, the upper layer is the feed layer connected to the mud conditioner raw material supply end, and the lower layer is the slag discharge layer connected to the waste slag at the end of the screw conveyor;

[0026] The bidirectional belt conveyor includes a retractable bracket, a driving roller is fixed on the bracket, and provides power for the bidirectional belt conveyor; a redirecting roller is arranged at a diagonal position of the driving roller to change the transmission direction of the grooved conveyor belt.

[0027] By means of the above technical solution, the present invention has at least the following beneficial effects:

[0028] The present invention adopts the combined action mode of mud pressure and soil pressure to balance the water and soil pressure in front of the heading face during shield tunneling, which can solve the problem of gushing of screw conveyors in high water pressure strata, reduce construction costs and improve economic benefits.

[0029] The invention is suitable for high-water-pressure sandy formations with large water pressure and strong permeability, and is also suitable for coarse-grained formations with less fine-grain content, and has a wide range of applications.

[0030] The present invention can realize resource recycling of waste fine mud and reduce pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic structural diagram of an earth pressure balance shield machine that provides slurry pressure based on waste fine mud provided by the present invention;

[0032] Figure 2 A schematic diagram of the internal structure of the slurry chamber in the earth pressure balance shield machine that uses waste fine mud to provide slurry pressure provided by the present invention;

[0033] Figure 3 A schematic diagram of the internal structure of a soil compartment in an earth pressure balance shield machine that provides slurry pressure based on waste fine mud provided by the present invention;

[0034] Figure 4 A schematic structural diagram of a bidirectional belt conveyor in an earth pressure balance shield machine that provides slurry pressure based on waste fine mud provided by the present invention;

[0035] Figure 5 This is a force analysis diagram of the internal structure of the earth pressure balance shield machine provided by the present invention, which uses waste fine mud to provide slurry pressure;

[0036] Figure 6 A schematic structural diagram of a variable-aperture foaming gun in an earth pressure balance shield machine that provides slurry pressure based on waste fine mud provided by the present invention;

[0037] Figure 7 for Figure 6 Side view of;

[0038] Figure 8 This is a working diagram of the earth pressure balance shield machine provided by the present invention that provides slurry pressure based on waste fine mud;

[0039] in:

[0040] 01- Cutterhead, 02- Mud Chamber, 03- Mud Chamber Partition, 04- Sealing Plate, 05- Moving Pulley Block, 06- First Mud Inlet Pipe, 07- Second Mud Inlet Pipe, 08- Mud Chamber Upper Partition, 09- Pressure Regulating Device, 10- Mud Chamber, 11- Central Rotating Shaft, 12- Bentonite Storage Tank, 13- Mortar Storage Tank, 14- Fine Mud Storage Tank, 15- Closed Mud Mixing and Agitating Tank, 16- Mud Transport Pump, 17- Raw Material Collection Tank, 18- Foam Liquid Storage Tank, 19- Foaming Gun, 20- Air Pressure Supply Device, 21- Bidirectional Belt Conveyor, 22- Pressure Sensor, 23- Mud Chamber Front Partition, 24- Mud Chamber Rear Partition, 25- Slag Discharge Channel, 26- Mud Discharge Pipe, 27- Spare Pipe, 28- Stirring Rod, 29- Screw Conveyor;

[0041] 001-pressure reducing valve, 002-integrated pressure / flow meter, 003-valve;

[0042] 0201-first mud delivery port, 0202-second mud delivery port, 0203-support arm, 0204-mud pressure sensor, 0205-standby mud discharge port, 0206-mud discharge port, 0207-slag discharge port, 0208-pulley support;

[0043] 1001-soil pressure sensor, 1002-mud discharge pipe, 1003-slag discharge port of screw conveyor;

[0044] 2101-redirection roller, 2102-carrying roller, 2103-conveying belt, 2104-retractable bracket, 2105-material guide chute, 2106-moving roller, 2107-bracket base, 2108-driving roller, 2109-tensioning device;

[0045] 1801-A type foam board, 1802-B type foam board, 1803-C type foam board, 1804-rubber plug. DETAILED DESCRIPTION

[0046] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below with reference to the accompanying drawings through specific implementation methods.

[0047] like Figures 1 to 8 As shown, an earth pressure balance shield machine (EPB) using waste fine mud to provide slurry pressure includes, from front to back, a tunneling cutterhead 01, a slurry chamber 02, a soil chamber 10, and a transport chamber. The transport chamber houses an integrated slurry preparation and injection system, a foam injection system, and a bidirectional belt conveyor 21. The fine mud material is transported to the integrated slurry preparation and injection system via the bidirectional belt conveyor 21. The conveying mechanism's starting point is located in the soil chamber 10, and its end point is connected to the bidirectional belt conveyor 21. The conveying mechanism is a screw conveyor 29.

[0048] The mud chamber 02 and the soil chamber 10 provide mud pressure and soil pressure respectively to maintain the stability of the tunnel face during the excavation process of the earth pressure balance shield machine.

[0049] Specifically, the mud chamber 02 is located near the excavation cutterhead 01 and includes a chamber body. Multiple mud supply ports are provided near the upper portion of the chamber wall, each of which is equipped with a mud inlet pipe. A mud discharge port 0206 is provided near the lower portion of the chamber wall, each of which is equipped with a mud outlet pipe 26. The mud chamber 02 regulates the amount of mud through the mud inlet and outlet pipes 26. In this embodiment, two mud supply ports are provided at the upper portion of the chamber wall of the mud chamber 02: a first mud supply port 0201 and a second mud supply port 0202. Each port is equipped with a mud inlet pipe: a first mud inlet pipe 06 and a second mud inlet pipe 07, respectively, to ensure sufficient slurry. An integrated pressure / flow meter 002 is installed on each mud inlet pipe to record real-time grouting pressure and grouting volume. Furthermore, a mud discharge port is provided at the bottom of the bulkhead of the mud tank 02, and a corresponding mud discharge pipe 26 is provided at the mud discharge port to discharge excess mud to the conveying mechanism of the transport tank, thereby regulating the mud pressure. A mud pressure sensor 0204 is installed inside the tank body to monitor the mud pressure in real time. Multiple support arms 0203 are arranged circumferentially in the middle of the tank body.

[0050] The bottom of the mud chamber 02 is provided with a slag discharge channel 25 communicating with the soil chamber 10 .

[0051] Furthermore, a backup mud discharge port 0205 is provided in the middle and lower portion of the mud chamber 02, and a backup pipe 27 is provided for backup mud discharge. When the mud inlet or outlet pipe 26 is blocked, the backup pipe 27 can realize mud inward or outward transportation, maintaining the stability of the mud pressure in the mud chamber 02.

[0052] The bottom of the mud chamber 02 is provided with a slag discharge port 0207 and a screw conveyor slag discharge port 1003.

[0053] A mud compartment bulkhead 03 is installed between the mud compartment 02 and the soil compartment 10. This bulkhead 03 is moved between the two compartments via a movable pulley block 05. The movable pulley block 05 is mounted on the top of the mud compartment 02 via a pulley support 0208. A motor controls the back-and-forth movement of the movable pulley block 05, thereby enabling forward and backward movement of the mud compartment bulkhead 03 and transferring pressure from the soil compartment 10 to the tunnel face. Sealing plates 04 are installed at the front and rear of the movable pulley block 05 to prevent mud from entering the interior of the movable pulley block 05 and thereby preventing the pulley from slipping.

[0054] The soil chamber 10 comprises a chamber body, whose central rotating shaft 11 is connected to the tunneling cutterhead 01. A front bulkhead 23 and a rear bulkhead 24 are respectively provided at the front and rear of the chamber body. A stirring rod 28 is mounted on the central rotating shaft 11, the distal end of which is fixed to the outer wall of the central rotating shaft 11. When the central rotating shaft 11 drives the tunneling cutterhead 01 to rotate, the stirring rod 28 is simultaneously rotated while the tunneling cutterhead 01 cuts the soil in front of the shield. This prevents the soil from clumping within the chamber 10, ensures the uniformity and fluidity of the soil, facilitates soil discharge, and maintains soil pressure stability. A pressure regulating device 09 is located at the top of the chamber body. This device adjusts the pressure in the chamber 10 based on the actual stress on the tunnel face, maintaining the stability of the tunnel face. A soil pressure sensor 1001 is also provided within the chamber 10. The end of the pressure regulating device 09 is provided with a soil compartment upper partition 08. The soil compartment upper partition 08 divides the body of the soil compartment 10 into two parts. The lower part is used to load the soil flowing in after being cut by the cutter head, and the upper part is used to load pressurized air. In this embodiment, when the pressure in the soil compartment 10 is insufficient, the pressure in the soil compartment 10 can be increased by inputting compressed gas. When the pressure in the mud compartment 10 is too high, the pressure in the mud compartment 10 can be reduced by the overflowing gas. At this time, the spring of the pressure regulating device 09 contracts, causing the upper partition of the mud compartment to move up and back to its position. The soil pressure sensor 1001 can monitor the soil pressure in the mud slurry compartment in real time, which is beneficial to the control of the soil pressure. A mud discharge pipe 1002 is provided at the bottom of the body of the mud compartment 10.

[0055] The integrated mud preparation and injection system is used to realize the preparation and injection of improved mud. Specifically, the integrated mud preparation and injection system includes a bentonite storage tank 12, a mortar storage tank 13, and a fine mud storage tank 14. The bentonite storage tank 12 is connected to the mortar storage tank 13 through a pipeline. The connected bentonite storage tank 12, the mortar storage tank 13 and the fine mud storage tank 14 are respectively connected to the grouting port of the closed mud mixing and stirring box 15 through pipelines, and the mud transport pump 16 is connected to the slurry outlet of the closed mud mixing and stirring box 15; the fine mud storage tank 14 is connected to the raw material collection tank 17 through a pipeline, and an integrated pressure / flow meter 002 and a valve 003 are provided on the pipeline. The working principle of the integrated mud preparation and injection system is as follows: the fine mud raw material obtained after the resource processing of waste slag is carried to the fine mud collection tank by a two-way belt conveyor 21, and then the fine mud raw material and bentonite raw material are respectively loaded into the fine mud storage tank 14 and the bentonite storage tank 12; the fine mud storage tank 14 and the bentonite storage tank 12 are equipped with stirring blades to circulate and stir the fine mud raw material and the bentonite raw material to prevent their segregation and affect the slurry properties. At the same time, the fine mud storage tank 14 and the bentonite storage tank 12 are equipped with moisture content detectors, which can measure the moisture content of the fine mud raw material and the bentonite raw material in real time to determine the amount of water added to prepare the new mud. The integrated pressure / flow meter 002 can monitor the injection pressure and injection volume of the fine mud raw material and the bentonite raw material in real time.

[0056] The bentonite storage tank 12 and the mortar storage tank 13 are connected via a pipeline. The connected bentonite storage tank 12 and the mortar storage tank 13 can achieve sufficient mixing of mortar and bentonite for the preparation of the back-wall grouting material.

[0057] At the same time, grouting pipes are provided on both sides of the closed mud mixing and stirring box 15, which can respectively realize the injection of fine mud raw materials and mortar and bentonite raw materials as raw materials. After the raw materials are loaded into the grouting pipes on both sides of the closed mud mixing and stirring box 15, water and powdered pumping agent are added, and the rotary motor of the closed mud mixing and stirring box 15 is adjusted to 3000r / min~5000r / min high-speed rotation for 3min~5min to ensure that the water, fine mud raw materials, bentonite raw materials, and pumping agent are fully mixed. At the same time, the closed mud mixing and stirring box 15 can prevent splashing during the slurry preparation process. The closed mud mixing and stirring box 15 prepares the slurry to form a prepared mud improver. Valve 003 is opened, and the mud improver flows out from the slurry outlet at the bottom of the closed mud mixing and stirring box 15. The prepared mud conditioner is injected into the front of the tunnel face through the mud transport pump 16 to form an impermeable cement film, balance the water and soil pressure in the tunnel face, and prevent excessive mud and water from entering the mud chamber 10, causing its pressure to be difficult to control and the screw conveyor 29 to gushed.

[0058] The foam injection system is used to achieve the generation and injection of foam required for soil improvement. Specifically, the foam injection system includes a foam liquid storage tank 18. The foam liquid storage tank 18 and the air pressure providing device 20 are respectively connected to the feed port of the foaming gun 19 through a connecting hose. A liquid injection pump is provided between the foam liquid storage tank 18 and the foaming gun 19. The discharge port of the foaming gun 19 sprays foam to the front of the face through a connecting hose. The connecting hose is provided with a valve 003 and an integrated pressure / flow meter 002. The foaming gun 19 is a variable aperture foaming gun. The foam liquid storage tank 18, the liquid injection pump, and the integrated pressure / flow meter 002 are connected in series to form a foaming liquid circuit. The air pressure providing device 20 and the pressure reducing valve 001 form a foaming gas circuit. The foaming liquid circuit and the foaming gas circuit are respectively connected to the two interfaces of the variable aperture foaming gun 19, and foaming is performed through the variable aperture foaming gun 19. To meet the foam particle size requirements of different formation types, the variable-aperture foaming gun 19 features three different pore diameters: Type A foaming plate 1801, Type B foaming plate 1802, and Type C foaming plate 1803. Type A foaming plate 1801 has a pore diameter of 3 mm, suitable for formations with a maximum particle size of 2 mm or less; Type B foaming plate 1802 has a pore diameter of 5 mm, suitable for formations with a maximum particle size between 2 mm and 60 mm; and Type C foaming plate 1803 has a pore diameter of 7 mm, suitable for formations with a maximum particle size of 60 mm or greater. The foaming plate with the appropriate pore diameter can be selected based on the needs. Rubber plugs 1804 seal both ends of the foaming gun 19 to prevent foam leakage.

[0059] The bidirectional belt conveyor 21 is used to realize the transportation of improver raw materials and the discharge of waste slag. Specifically, the bidirectional belt conveyor 21 is a movable equipment, which is divided into two layers, upper and lower, for bidirectional transportation. The upper layer is the feed layer connected to the mud improver raw material supply end, and the lower layer is the slag discharge layer connected to the waste slag at the end of the screw conveyor 29. Furthermore, the bidirectional belt conveyor 21 includes a retractable bracket 2104, which can adjust the length according to the distance from the shield machine face to the shield tail. The drive roller 2108 is fixed on the bracket to provide power for the entire bidirectional belt conveyor 21; it is set at the slag discharge end to provide more power. The redirecting roller 2101 is set at the diagonal position of the drive roller 2108, which can change the transmission direction of the grooved conveyor belt 2103. The retractable support 2104 comprises two layers, upper and lower, with the grooved conveyor belt 2103 mounted on these layers via supporting rollers 2102. The supporting rollers 2102 are mounted on the retractable support 2104 to support the grooved conveyor belt 2103 and bear the weight of the material. Both the upper and lower grooved conveyor belts 2103 are equipped with material guide troughs 2105 for loading the soil material used for the slurry conditioner or waste slag, respectively. The grooved conveyor belt 2103 is equipped with a tensioning device 2109, located near the slag discharge end. This device adjusts the tension of the grooved conveyor belt 2103 and provides the required tension for friction drive. Multiple stripes are featured on both sides of the grooved conveyor belt 2103 to increase friction with the load. A movable roller 2106 is provided at the bottom of the retractable bracket 2104 , which can move the belt conveyor as the shield machine moves forward; specifically, the movable roller 2106 is fixed to the bottom of the retractable bracket 2104 through a bracket base 2107 .

[0060] The working principle of the above-mentioned earth pressure balance shield machine using waste fine mud to provide slurry pressure is as follows:

[0061] The water and soil pressure at the front end of the shield machine face is balanced by mud pressure and soil pressure.

[0062] The screened fine mud is transported to the raw material collection tank 17 via the upper layer of a bidirectional belt conveyor 21. The fine mud in the fine mud storage tank is thoroughly mixed with the bentonite in the bentonite storage tank 12 and the bentonite in the bentonite storage tank 12 via the enclosed mud mixing and agitation tank 15. The mud is then transported to the mud compartment 02 via the mud transport pump 16 and the mud inlet pipe. The mud pressure in the mud compartment 02 is regulated via the mud inlet and outlet pipes 26 to balance the pressurized water in front of the cutting disc 01. If the mud inlet pipe becomes clogged or the mud pressure is insufficient, temporary replenishment can be achieved via the backup pipe 27.

[0063] Mud pressure is provided by pressurized mud injected into the mud chamber 02. Mud conditioner is injected into the soil at the front end of the tunnel face through an integrated mud preparation and injection system. Soil pressure is provided by the debris in the mud chamber 10. Soil cut by the excavation cutterhead 01 can enter the mud chamber 10 through the slag discharge channel 25. The stirring rods 28 in the mud chamber 10 can stir the debris at different speeds depending on its state, preventing the deterioration of the debris coagulation properties and making the pressure in the mud chamber 10 difficult to control. During the excavation process of the earth pressure balance shield machine based on waste fine mud to provide mud pressure, the debris cut by the excavation cutterhead 01 enters the mud chamber 10 through the slag discharge channel 25. The accumulated soil pressure acts on the mud chamber front partition 23, pushing the mobile pulley block 05, transmitting the pressure to the mud chamber 02. Together with the mud pressure in the mud chamber 02, it balances the water and soil pressure in front of the tunnel face.

[0064] When there is excess mud, it can be discharged into the screw conveyor 29 through the mud outlet pipe 26 at the bottom of the mud compartment 02, and then transported by the screw conveyor 29 to the lower layer of the two-way belt conveyor 21, and further transported outside the machine for resource processing. The fine mud raw materials obtained after resource processing are again carried to the fine mud collection tank through the two-way belt conveyor 21.

[0065] The excavation cutterhead 01 is provided with a pressure sensor 22. When the pressure sensor 22 detects that the pressure acting on the tunnel face is uneven, the pressure device on the top of the soil cabin 10 adjusts the soil pressure and the pressure distribution. The pressure regulating device 09 adjusts the position of the partition 08 on the soil cabin to change the space of the soil cabin 10 and the distribution of the soil in the cabin. The pressure distribution also changes randomly, such as Figure 5 As shown, precise control is achieved.

[0066] The earth pressure balance shield of the present invention can adjust the mud pressure and soil pressure according to the actual stress conditions of the tunnel face during excavation, and can better maintain the stability of the tunnel face.

Claims

1. An earth pressure balance shield machine based on waste fine mud to provide mud pressure, characterized in that: include: The tunneling cutterhead, mud chamber, soil chamber and transport chamber are arranged in sequence from front to back; An integrated slurry preparation and injection system, provided in the transport cabin, for preparing and injecting back-wall grouting materials and improved slurry; a foam injection system and a bidirectional belt conveyor; A foam injection system is provided in the transport cabin and is used to generate and inject foam required for soil improvement; A bidirectional belt conveyor is provided in the transport cabin and is used for conveying the improver raw materials and discharging the waste soil; The conveying mechanism is arranged in the transport cabin, with the conveying starting end located in the soil cabin and the conveying end located on the bidirectional belt conveyor.

2. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 1, characterized in that: The mud chamber is arranged near the excavation cutterhead and includes a chamber body, a plurality of mud supply ports are opened near the upper portion of the chamber wall, and mud inlet pipes are correspondingly provided at the mud supply ports; a mud discharge port is opened near the lower portion of the chamber wall, and mud outlet pipes are correspondingly provided at the mud discharge port; an integrated pressure / flow meter is installed on the mud inlet pipe; A mud discharge port is provided at the bottom of the bulkhead of the mud tank, and a mud discharge pipe is provided at the mud discharge port to discharge excess mud to the conveying mechanism of the transport tank; The bottom of the mud tank is provided with a slag discharge channel which is communicated with the mud tank.

3. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 2, characterized in that: A mud pressure sensor is provided inside the mud tank body to monitor the mud pressure in the mud tank in real time.

4. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 2, characterized in that: A plurality of supporting arms are circumferentially arranged in the middle of the mud compartment.

5. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 2, characterized in that: A spare pipe is provided at the middle and lower part of the mud chamber for discharging mud in a standby manner.

6. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 1, characterized in that: A mud compartment partition is provided between the mud compartment and the soil compartment, and the mud compartment partition is moved between the mud compartment and the soil compartment by a movable pulley group; the movable pulley group is arranged on the top of the mud compartment through a pulley support, driving the mud compartment partition to move, so as to transmit the mud compartment pressure to the tunnel face.

7. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 1, characterized in that: The soil cabin includes a cabin body, a central rotating shaft of the cabin body is connected to the excavation cutter disc, and a stirring rod is provided on the central rotating shaft; a pressure regulating device is provided in the soil cabin, and a soil cabin upper partition is provided at the end of the pressure regulating device. The soil cabin upper partition divides the cabin body of the soil cabin into two parts, the lower part is used to load the soil flowing in after the cutter disc is cut, and the upper part is used to load pressurized air; a soil pressure sensor is provided in the soil cabin to monitor the soil pressure in the mud cabin in real time.

8. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 1, characterized in that: The integrated mud preparation and injection system includes a bentonite storage tank, a mortar storage tank, and a fine mud storage tank. The bentonite storage tank and the mortar storage tank are connected by a pipeline. The connected bentonite storage tank, mortar storage tank, and fine mud storage tank are respectively connected to the grouting port of the closed mud mixing and stirring box. The mud transport pump is connected to the slurry outlet of the closed mud mixing and stirring box; the fine mud storage tank is connected to the raw material collection tank, and an integrated pressure / flow meter and valve are provided on the pipeline; The bentonite storage tank and the mortar storage tank are connected by a pipeline. The connected bentonite storage tank and the mortar storage tank can achieve full mixing of mortar and bentonite for the preparation of back-wall grouting materials. Grouting pipes are provided on both sides of the closed mud mixing and stirring box to respectively realize the injection of fine mud raw materials and mortar and bentonite raw materials as raw materials. After the raw materials are filled in the grouting pipes on both sides of the closed mud mixing and stirring box, water and powdered pumping agent are filled in for the preparation of mud improver.

9. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 1, characterized in that: The foam injection system includes a foam liquid storage tank, which is connected to the feed port of the foaming gun via a connecting hose and an air pressure supply device. A liquid injection pump is provided between the foam liquid storage tank and the foaming gun. The discharge port of the foaming gun sprays foam to the front of the tunnel face via a connecting hose, which is provided with a valve and an integrated pressure / flow meter. The foaming gun is a variable aperture foaming gun, and both ends of the foaming gun are sealed by rubber plugs to prevent the foam liquid from leaking.

10. The earth pressure balance shield machine using waste fine mud to provide slurry pressure according to claim 1, characterized in that: The bidirectional belt conveyor is a two-way conveyor with two layers, the upper layer is the feed layer connected to the mud conditioner raw material supply end, and the lower layer is the slag discharge layer connected to the waste slag at the end of the screw conveyor; The bidirectional belt conveyor includes a retractable bracket, a driving roller is fixed on the bracket, and provides power for the bidirectional belt conveyor; a redirecting roller is arranged at a diagonal position of the driving roller to change the transmission direction of the grooved conveyor belt.

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