A device and method for high-pressure jet flushing mud cakes for a slurry shield and a shield machine

Abstract

The present invention belongs to the field of underground engineering technology, and proposes a mud-water shield high-pressure jet flushing mud cake device, method and shield machine. The rotary center includes a mud-water pipeline tee, a rotary joint arranged at one end of the mud-water pipeline tee, and a mud-water channel arranged at the other end of the mud-water pipeline tee; a first water jet pipe is arranged at one end of the rotary joint, and a second water jet pipe is arranged at the other end of the one end of the rotary joint. The second water jet pipe is located in the mud-water channel, and the first water jet pipe and the second water jet pipe are connected by the rotary joint. The second water jet pipe is located in the mud-water channel, and does not require the cooperation of additional sealing parts. On the basis of ensuring sealing, the water supply mechanism is allowed to inject a larger water pressure into the first water jet pipe, the second water jet pipe and the third water jet pipe, thereby improving the water jet flushing ability, and can quickly destroy the mud cake, thereby ensuring construction effect and efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground engineering, and in particular relates to a device and method for high-pressure jet flushing of mud cakes for a slurry shield, and a shield machine. Background Art

[0002] As a slurry shield machine advances, it supplies slurry into the cutterhead chamber to maintain pressure inside and outside the cutterhead, achieving pressure balance and enabling rapid excavation. Slurry shields are commonly used for excavation in soft sandstone and other strata with high concentrations of soil and mud. During excavation, the soft ground and high concentrations of soil and mud easily clog the cutterhead, forming a mud cake. This mud cake is extremely difficult to remove and significantly impacts excavation speed. Current methods to mitigate the cutterhead mud cake problem primarily involve adding foam, bentonite, anti-caking agents, and dispersants. However, if these agents are not added in a timely manner or if the ground is not properly surveyed, mud cakes often form, necessitating manual removal of the cutterhead chamber, which carries significant safety risks.

[0003] In the current technology, a nozzle is set on the cutter head, water is supplied to the nozzle through a water supply pipe, and then the mud cake is destroyed by flushing the mud cake with a water jet, thereby achieving the purpose of removing the mud cake. However, at present, in the water jet flushing mud cake method, the water supply pipe is set on the side wall of the rotation center, outside the mud and water pipeline, and the water supply pipe requires the cooperation of seals and the like to ensure sealing. However, due to the limitation of the cooperation of seals and the like, the allowable water pressure in the water supply pipe cannot be too large. If the water pressure is too large, the seals and the like lose their function, resulting in limited water supply pressure, insufficient flushing ability of the water jet to destroy the mud cake, or poor destruction effect and long time, affecting the construction effect and efficiency. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a mud-water shield high-pressure jet flushing mud cake device, method and shield machine, wherein the first water jet pipe and the second water jet pipe are connected by a rotary joint, and the second water jet pipe is located in the mud-water channel, and no additional sealing parts are required. On the basis of ensuring the sealing, the water supply mechanism is allowed to inject a larger water pressure into the first water jet pipe, the second water jet pipe and the third water jet pipe, thereby improving the water jet flushing ability, and can quickly destroy the mud cake, thereby ensuring the construction effect and efficiency.

[0005] In order to achieve the above-mentioned objectives, in a first aspect, the present invention provides a slurry shield high-pressure jet flushing mud cake device, which adopts the following technical solutions:

[0006] A high-pressure jet mud cake flushing device for a slurry shield, comprising a water supply mechanism, a first water jet pipe connected to the water supply mechanism, a rotation center, and a cutterhead assembly;

[0007] The rotation center includes a mud and water pipeline tee, a rotary joint arranged at one end of the mud and water pipeline tee, and a mud and water channel arranged at the other end of the mud and water pipeline tee; a first water jet pipe is arranged at one end of the rotary joint, and a second water jet pipe is arranged at the other end of one end of the rotary joint, and the second water jet pipe is located in the mud and water channel; the cutter disc assembly includes a third water jet pipe, and a nozzle arranged at one end of the third water jet pipe, and the end of the third water jet pipe away from the nozzle is connected to the second water jet pipe.

[0008] Furthermore, a mud and water pipeline diverter valve is provided at one end of the rotation center away from the mud and water pipeline tee; a water jet diverter valve is provided outside the mud and water pipeline diverter valve.

[0009] Furthermore, the second water jet pipe is connected to the inlet of the water jet diverter valve, and third water jet pipes are respectively provided on multiple outlets of the water jet diverter valve.

[0010] Furthermore, the cutter disc assembly is provided with multiple first nozzles and multiple second nozzles, the first nozzles are telescopic nozzles, and the second nozzles are fixed nozzles; the cutter disc assembly includes a cutter disc, and multiple slag outlets arranged on the cutter disc, and each slag outlet is provided with a first nozzle and a second nozzle.

[0011] Furthermore, the dimension of one end of the slag outlet close to the edge of the cutter disc is larger than the dimension of the other end close to the center of the cutter disc; the first nozzle is located at one end of the slag outlet close to the edge of the cutter disc, and the second nozzle is located at one end of the slag outlet close to the center of the cutter disc.

[0012] Furthermore, the first nozzle includes a first nozzle water inlet pipe connected to the third water jet pipe, and a plurality of first nozzles arranged at the end of the first nozzle water inlet pipe, and the first nozzle is arranged at an angle at the end of the first nozzle water inlet pipe; a telescopic section is provided on the first nozzle water inlet pipe; the second nozzle is a fan-shaped nozzle, and the second nozzle includes a second nozzle water inlet pipe, and a plurality of second nozzles arranged at the end of the second nozzle water inlet pipe, and the second nozzle is arranged at an angle at the end of the second nozzle water inlet pipe.

[0013] Furthermore, the cutter head assembly is also provided with one or more nozzles selected from the group consisting of a third nozzle, a fourth nozzle and a fifth nozzle; the third nozzle is a rotary nozzle, the fourth nozzle is a pulse nozzle, and the fifth nozzle is an oscillating nozzle.

[0014] Furthermore, the water supply mechanism includes a plurality of pumps, which are connected in series and / or in parallel to form one or more pump groups; and the one or more pump groups are all connected to the first water jet pipe.

[0015] In order to achieve the above-mentioned purpose, in a second aspect, the present invention further provides a method for jet flushing mud cakes in a slurry shield with increased water pressure, which adopts the following technical solution:

[0016] A method for flushing mud cakes by jetting a slurry shield with increased water pressure uses the slurry shield high-pressure jet flushing mud cake device as described in the first aspect, comprising: a water supply mechanism injecting water into a first water jet pipe, a second water jet pipe and a third water jet pipe, and flushing the mud cakes by the water jet formed by the nozzle.

[0017] In order to achieve the above-mentioned purpose, in a third aspect, the present invention further provides a shield machine, which adopts the following technical solution:

[0018] A shield machine uses the slurry shield high-pressure jet mud cake flushing device as described in the first aspect.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, the rotary center includes a mud and water pipeline tee, a rotary joint arranged at one end of the mud and water pipeline tee, and a mud and water channel arranged at the other end of the mud and water pipeline tee; the first water jet pipe is arranged at one end of the rotary joint, and the other end of the one end of the rotary joint is provided with a second water jet pipe, and the second water jet pipe is located in the mud and water channel. The first water jet pipe and the second water jet pipe are connected by the rotary joint, and the second water jet pipe is located in the mud and water channel. No additional sealing parts are required. On the basis of ensuring sealing, the water supply mechanism is allowed to inject a large water pressure into the first water jet pipe, the second water jet pipe and the third water jet pipe, thereby improving the water jet flushing ability, and can quickly destroy the mud cake, thereby ensuring construction effect and efficiency.

[0021] 2. The present invention is provided with multiple first nozzles and multiple second nozzles on the cutter disc assembly, the first nozzle is a telescopic nozzle, and the second nozzle is a fixed nozzle; specifically, the size of one end of the slag outlet close to the edge of the cutter disc is larger than the size of the other end close to the center of the cutter disc; the first nozzle is located at the end of the slag outlet close to the edge of the cutter disc, and the second nozzle is located at the end of the slag outlet close to the center of the cutter disc; by changing the position of the water jet through the telescopic function of the telescopic nozzle, the mud cake at the end of the slag outlet with a larger size can be fully flushed, thereby ensuring the mud cake flushing effect, and the fixed nozzle is used at the end of the slag outlet with a smaller size to ensure flushing stability.

[0022] 3. In the present invention, the first nozzle is tiltedly arranged at the end of the water inlet pipe of the first nozzle, and the second nozzle is tiltedly arranged at the end of the water inlet pipe of the second nozzle, which ensures the direction of the water jet on the mud cake and improves the mud cake flushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the specification of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments and descriptions of this embodiment are used to explain this embodiment and do not constitute an improper limitation on this embodiment.

[0024] Figure 1 Schematic diagram of the device structure of Example 1 of the present invention;

[0025] Figure 2 Schematic diagram of the rotation center structure of Example 1 of the present invention;

[0026] Figure 3 This is a cross-sectional view of the rotation center of Example 1 of the present invention;

[0027] Figure 4 This is a schematic structural diagram of a cutter head assembly according to Example 1 of the present invention;

[0028] Figure 5 This is a schematic structural diagram of the first nozzle of Example 1 of the present invention;

[0029] Figure 6 This is a cross-sectional view of the first nozzle of Example 1 of the present invention;

[0030] Figure 7 This is a schematic structural diagram of the second nozzle of Example 1 of the present invention;

[0031] Figure 8 This is a cross-sectional view of the second nozzle of Example 1 of the present invention;

[0032] Figure 9 Schematic diagram of the third nozzle structure of Example 2 of the present invention;

[0033] Among them, 100, water supply mechanism; 200, first water jet pipe; 300, rotation center; 301, rotary joint; 302, mud and water pipeline tee; 303, fixed frame; 304, mud and water pipeline diverter valve; 305, water jet diverter valve; 306, second water jet pipe; 307, support frame; 308, water inlet; 309, mud and water channel; 400, cutterhead assembly; 401, cutterhead; 402, rock breaking roller; 4 03. Slag outlet; 404. Third water jet pipe; 405. Mud water inlet pipe; 410. First nozzle; 4101. Water inlet pipe of first nozzle; 4102. Telescopic section; 4103. First nozzle; 420. Second nozzle; 4201. Water inlet pipe of second nozzle; 4202. Fixed seat; 4203. Second nozzle; 430. Third nozzle; 4301. Rotating part; 4302. Third nozzle; 440. Switch. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0036] Example 1:

[0037] like Figure 1 As shown, this embodiment provides a high-pressure jet mud cake flushing device for a slurry shield. This device can proactively flush the cutterhead or, when mud cake forms, remove it by high-pressure flushing. This device offers high safety, preventative or immediate treatment, high flushing efficiency, and a safe and stable overall system. The mud cake flushing device in this embodiment includes a water supply mechanism 100, a first water jet pipe 200, a rotation center 300, and a cutterhead assembly 400.

[0038] The water supply mechanism 100 is a water supply device that can be implemented using existing technologies. Alternatively, a high-pressure jet or ultra-high-pressure, high-flow power system can be used. In some embodiments, the water supply mechanism 100 can optionally be an ultra-high-pressure power system, which is the power source for the mud cake erosion mechanism. It primarily provides a jet power of 0 to 420 MPa or a flow rate of 0 to 450 L / min. Currently, the water pressure and flow rate for mud cake erosion are inversely proportional: the higher the water pressure, the lower the flow rate; the lower the water pressure, the higher the flow rate.

[0039] In some embodiments, the water supply mechanism 100 is provided with multiple pumps, which are connected in series and / or in parallel to form one or more pump groups; one or more pump groups are connected to the first water jet tube 200 to provide sufficient ultra-high pressure and large flow power.

[0040] The first water jet pipe 200 can be a soft hose or a high-pressure hose. In some embodiments, the first water jet pipe 200 has an optional pressure range of 0 to 600 MPa and is composed of six layers of material, including steel mesh, polyoxymethylene (POM), polyamide (PA), etc. The flow rate can be customized after calculation.

[0041] The rotation center 300 realizes the separation of static and dynamic functions of the mud and water pipeline, which can be realized on conventional equipment or obtained by modifying conventional equipment.

[0042] like Figure 2 and Figure 3 As shown, the rotation center 300 includes a rotary joint 301, a mud and water pipeline tee 302, a fixing frame 303, a mud and water pipeline diverter valve 304, a water jet diverter valve 305, a second water jet pipe 306, a support frame 307, a water inlet 308 and a mud and water channel 309, etc.

[0043] The rotary joint 301 is located at the end of the mud and water pipeline tee 302. The rotary joint 301 is a water pipe rotary joint, one end of which is connected to the first water jet pipe 200 via the water inlet 308, and the other end is connected to the second water jet pipe 306. The end of the first water jet pipe 200 away from the rotary joint 301 is connected to the water supply mechanism 100. The second water jet pipe 306 is located within the mud and water channel 309, in the middle of the channel. The second water jet pipe 306 is a high-pressure pipe. To improve its stability, a support frame 307 is installed between the second water jet pipe 306 and the mud and water channel 309. The water jet diverter valve 305 is a high-pressure jet single-to-multiple diverter valve block.

[0044] The main function of the rotary joint 301 is to transmit high-pressure water from one end to the rotating cutterhead at the other end, thereby realizing the supply of high-pressure water. In existing slurry shield machines, depending on the diameter of the cutterhead, there is a hollow pipe wall with a diameter of several hundred millimeters in the middle. This pipe wall supplies mud mixture from the outside to the cutterhead pressure chamber to achieve the same pressure difference between the inside and outside of the cutterhead, and supplies mud to the roller cutters for cooling. The key to the high-pressure jet system installed in existing slurry shield machines is the high-pressure water dynamic and static separation transmission technology of the rotary joint 301. The transmission scheme in this embodiment is to add the mud and water pipeline tee 302 on the side away from the cutterhead 401, and the mud and water are connected from the bottom. The horizontal side is the sealing and installation space of the rotary joint 301. The sealing performance of the rotary joint 301 meets the requirements. The mud supply pressure is 1Mpa and the flow rate is three to five cubic meters per minute. Under this flow rate, the dynamic and static sealing of the rotary joint 301 meets the use environment.

[0045] In some embodiments, a second water jet tube 306 is added inside the rotation center 300. The second water jet tube 306 is a high-pressure hard tube. The second water jet tube 306 is arranged at a flow rate and pressure that meet the current usage conditions. The second water jet tube 306 needs to ensure absolute center. Since the rotation center 300 is long, a support frame 307 is added inside the mud and water channel 309. The optional herringbone support frame is to ensure the stability of the augmentation equipment.

[0046] The sealing performance of the rotary joint 301 is sufficient for the environment of a slurry pipeline. In some embodiments, a thin-walled steel pipe can be placed outside the second water jet pipe 306 to increase wear resistance. The support frame 307 ensures that the second water jet pipe 306 does not bend during rotation. The space of the water jet diverter valve 305 can be adjusted as needed to accommodate the confined installation environment of the cutterhead 401.

[0047] Specifically, the second water jet pipe 306 is located in the mud and water channel 309, and the first water jet pipe 200 and the second water jet pipe 306 are connected by the rotary joint 301. The second water jet pipe 306 is located in the mud and water channel 309, and does not require the cooperation of additional seals, etc. On the basis of ensuring sealing, the water supply mechanism 100 is allowed to inject a larger water pressure into the first water jet pipe 200, the second water jet pipe 306 and the third water jet pipe 404, thereby improving the water jet flushing ability, and can quickly destroy the mud cake, thereby ensuring the construction effect and efficiency.

[0048] like Figure 4 As shown, the cutterhead assembly 400 includes a cutterhead 401, rock-breaking roller cutters 402, a slag outlet 403, a third water jet pipe 404, and a mud inlet pipe 405. The cutterhead 401 is provided with a first nozzle 410 and a second nozzle 420. The first nozzle 410 includes a first nozzle inlet pipe 4101, a telescopic section 4102, and a first nozzle 4103. The second nozzle 420 includes a second nozzle inlet pipe 4201, a fixing base 4202, and a second nozzle 4203.

[0049] The cutterhead 401 and the rock-breaking roller cutter 402 are conventional technologies. A plurality of slag outlets 403 are provided on the cutterhead 401. In some embodiments, the cutterhead 401 is entirely made of high-pressure hard pipes and runs through the cable duct of the shield machine, thereby adding a layer of protection while reducing space occupancy.

[0050] The cutter head 401 is provided with a plurality of first nozzles 410 and a plurality of second nozzles 420 . The first nozzles 410 are telescopic nozzles, and the second nozzles 420 are fixed nozzles. The telescopic nozzles can fully flush the mud cake.

[0051] Specifically, each slag outlet 403 is equipped with a first nozzle 410 and a second nozzle 420. Furthermore, the area of ​​the end of the slag outlet 403 near the edge of the cutterhead 401 is larger than the area of ​​the end near the center of the cutterhead 401. The first nozzle 410 is located at the end of the slag outlet 403 near the edge of the cutterhead 401, and the second nozzle 420 is located at the end of the slag outlet 403 near the center of the cutterhead 401. By adjusting the position of the water jet using the telescopic nozzle, the larger end of the slag outlet 403 can be fully flushed, ensuring effective flushing. A fixed nozzle is used at the smaller end of the slag outlet 403, ensuring stable flushing.

[0052] like Figure 5 and 6As shown, optionally, the first nozzle 410 includes a first nozzle water inlet pipe 4101 connected to the third water jet pipe 404, and a plurality of first nozzles 4103 disposed at the end of the first nozzle water inlet pipe 4101. The first nozzles 4103 are disposed at an angle at the end of the first nozzle water inlet pipe 4101. The first nozzle water inlet pipe 4101 is provided with a telescopic section 4102. The telescopic section 4102 can be implemented as a cylinder or other telescopic device, and the first nozzle water inlet pipe 4101 can be disposed at the end of a telescopic rod of the telescopic section 4102 to avoid being affected by the telescopic movement. Alternatively, a structure such as a sealed telescopic rod can be provided in the middle of the telescopic section 4102, and the first nozzle water inlet pipe 4101 can be divided into two sections, respectively connected to the ends of the sealed telescopic rod to achieve the telescopic function.

[0053] like Figure 7 and 8 As shown, the second nozzle 420 is a fan-shaped nozzle, comprising a second nozzle water inlet pipe 4201 and a plurality of second nozzles 4203 disposed at the end of the second nozzle water inlet pipe 4201. The second nozzles 4203 are obliquely disposed at the end of the second nozzle water inlet pipe 4201. The second nozzle 420 can be mounted on the cutter head 401 via a fixing base 4202.

[0054] It can be understood that the first nozzle 4103 is tiltedly arranged at the end of the first nozzle water inlet pipe 4101, and the second nozzle 4203 is tiltedly arranged at the end of the second nozzle water inlet pipe 4201, which ensures the direction of the water jet on the mud cake and improves the mud cake flushing effect. When in use, the fan-shaped nozzle on the first nozzle 410 sprays out and sprays at 180 degrees to achieve 360-degree coverage at this position. By adjusting the telescopic height, coverage of different areas can be achieved. The second nozzle 420 is fixed in the shell tearing knife. The shell knife digs a hole downward, and the water nozzle is installed in the hollow inside. By fixing the installation angle, it continuously sprays to the area where mud cake is easily formed, thereby completing the task of removing mud cake with high-pressure jet.

[0055] One of the workflows of the device in this embodiment is:

[0056] The water supply mechanism 100 is turned on to pressurize the water supply mechanism 100. The water jet switches at the first nozzle 410 and the second nozzle 420 are turned on. Water from the water supply mechanism 100 flows from the water supply mechanism 100 through the first water jet pipe 200 and the rotary joint 301. The rotary joint 301 is separated into a dynamic and static state, and the high-pressure water passes through the third water jet pipe 404 and is ejected from the first nozzle 410 and / or the second nozzle 420.

[0057] The first nozzle 410 and the second nozzle 420 are two types of water jet nozzles. The first nozzle 410 is a telescopic nozzle. When flushing the mud cake, the cutterhead is extended a certain distance, and high-pressure water is ejected from the first nozzle 4103. The first nozzle 4103 has two nozzle options: a fan-shaped nozzle sprays in a circular arc, and a linear nozzle sprays in a straight line, thereby flushing the slag outlet 403 and the mud cake.

[0058] The second nozzle 420 is a fixed water jet, fixed to the cutterhead 401. The water jet consists of a tearing blade, which penetrates the inside of the tearing blade and has holes on the side of the tearing blade. The second nozzle 4203 is also a fan-shaped or linear nozzle, which sprays high-pressure jets downward toward the slag outlet and the cutterhead surface.

[0059] Example 2:

[0060] This embodiment provides a high-pressure jet mud cake flushing device for a slurry shield. Unlike Example 1, in addition to the first nozzle 410 and the second nozzle 420 provided in the embodiment, a third nozzle 430, a fourth nozzle, and a fifth nozzle are provided. Any one of the first nozzle 410, the second nozzle 420, the third nozzle 430, the fourth nozzle, and the fifth nozzle can be provided on the cutterhead 401 to flush the mud cake, or any two or more of the above nozzles can be provided on the cutterhead 401 to flush the mud cake, thereby reducing blind spots and increasing the flushing range.

[0061] Optional, such as Figure 9 As shown, the third nozzle 430 is a rotating nozzle, which can be automatically rotated about its vertical axis by water pressure. Alternatively, the third nozzle 430 can include a rotating portion 4301 and a third nozzle 4302. The rotating portion 4301 is powered by a rotating motor or other power source, and a conversion head or conversion member is provided to achieve water flow transmission during rotation. By providing a rotating nozzle, a 360° water jet can be sprayed, increasing the flushing range.

[0062] The fourth nozzle is a pulse nozzle, such as Figure 4 As shown, optionally, a switch 440 is provided on one or more water jet pipes. The switch 440 is a controllable switch that is opened and closed according to a preset frequency to realize pulsed injection of the water jet, thereby improving the mud cake flushing effect.

[0063] The fifth nozzle is a swing nozzle, which can be realized by setting a motor or other power equipment, so that the nozzle can swing according to a certain angle and trajectory during spraying, thereby improving the mud cake washing effect.

[0064] Example 3:

[0065] This embodiment provides a method for flushing mud cakes with a slurry shield jet by increasing water pressure, using a slurry shield high-pressure jet flushing mud cake device as described in Example 1, including: a water supply mechanism 100 injects water into the first water jet pipe 200, the second water jet pipe 306 and the third water jet pipe 404, and the mud cake is flushed by the water jet formed by the nozzle.

[0066] Example 4:

[0067] This embodiment provides a shield machine that uses the slurry shield high-pressure jet mud cake flushing device described in Example 1.

[0068] The above description is merely a preferred embodiment of this embodiment and is not intended to limit this embodiment. Those skilled in the art will readily appreciate that this embodiment may be modified and varied in various ways. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this embodiment shall be within the scope of protection of this embodiment.

Claims

1. A high-pressure jet flushing mud cake device for a slurry shield, characterized in that: It includes a water supply mechanism, a first water jet pipe connected to the water supply mechanism, a rotation center and a cutter head assembly; The rotary center includes a mud and water pipeline tee, a rotary joint provided at one end of the mud and water pipeline tee, and a mud and water channel provided at the other end of the mud and water pipeline tee, with mud and water entering from the bottom, and the horizontal level being the sealing and installation space of the rotary joint; a first water jet pipe is provided at one end of the rotary joint, a second water jet pipe is provided at the other end of the rotary joint, and the second water jet pipe is located in the mud and water channel; the cutterhead assembly includes a third water jet pipe, and a nozzle provided at one end of the third water jet pipe, and the end of the third water jet pipe away from the nozzle is connected to the second water jet pipe; The cutterhead assembly is provided with a plurality of first nozzles and a plurality of second nozzles, wherein the first nozzles are telescopic nozzles and the second nozzles are fixed nozzles; the cutterhead assembly comprises a cutterhead and a plurality of slag outlets provided on the cutterhead, each slag outlet being provided with a first nozzle and a second nozzle; The dimension of one end of the slag outlet close to the edge of the cutter disc is larger than the dimension of the other end close to the center of the cutter disc; the first nozzle is located at one end of the slag outlet close to the edge of the cutter disc, and the second nozzle is located at one end of the slag outlet close to the center of the cutter disc; the first nozzle includes a plurality of first nozzles arranged at the end of the water inlet pipe of the first nozzle, and the first nozzles are arranged at an angle at the end of the water inlet pipe of the first nozzle; the second nozzle includes a plurality of second nozzles arranged at the end of the water inlet pipe of the second nozzle, and the second nozzles are arranged at an angle at the end of the water inlet pipe of the second nozzle.

2. A high-pressure jet flushing mud cake device for a slurry shield according to claim 1, characterized in that: A mud and water pipeline diverter valve is provided at one end of the rotation center away from the mud and water pipeline tee; a water jet diverter valve is provided outside the mud and water pipeline diverter valve.

3. A high-pressure jet flushing mud cake device for a slurry shield according to claim 2, characterized in that: The second water jet pipe is connected to the inlet of the water jet diverter valve, and third water jet pipes are respectively provided on multiple outlets of the water jet diverter valve.

4. A high-pressure jet flushing mud cake device for a slurry shield according to claim 1, characterized in that: The first nozzle includes a first nozzle water inlet pipe connected to the third water jet pipe, and the first nozzle water inlet pipe is provided with a telescopic section; the second nozzle is a fan-shaped nozzle, and the second nozzle includes a second nozzle water inlet pipe.

5. The high-pressure jet flushing mud cake device for a slurry shield according to claim 1, characterized in that: The cutter head assembly is further provided with one or more of a third nozzle, a fourth nozzle and a fifth nozzle; the third nozzle is a rotary nozzle, the fourth nozzle is a pulse nozzle, and the fifth nozzle is an oscillating nozzle.

6. A high-pressure jet flushing mud cake device for a slurry shield according to claim 1, characterized in that: The water supply mechanism includes a plurality of pumps, which are connected in series and / or in parallel to form one or more pump groups; and the one or more pump groups are all connected to the first water jet pipe.

7. A method for flushing mud cake by jetting in a slurry shield with increased water pressure, characterized in that: The mud cake flushing device of the slurry shield high-pressure jet as described in any one of claims 1 to 6 is used, comprising: a water supply mechanism injecting water into the first water jet pipe, the second water jet pipe and the third water jet pipe, and flushing the mud cake by the water jet formed by the nozzle.

8. A shield machine, characterized in that: A slurry shield high-pressure jet mud cake flushing device as described in any one of claims 1 to 6 is used.

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