Slurry shield high-pressure jet flow mud cake washing device and method and shield tunneling machine

Abstract

The invention belongs to the technical field of underground engineering, and provides a slurry shield high-pressure jet flow mud cake washing device and method and a shield tunneling machine. A rotation center comprises a slurry pipeline tee joint, a rotation connector arranged at one end of the slurry pipeline tee joint and a slurry channel arranged at the other end of the slurry pipeline tee joint; the first water jet pipe is arranged at one end of the swivel joint, the second water jet pipe is arranged at the other end of the swivel joint and located in the muddy water channel, the first water jet pipe and the second water jet pipe are connected through the swivel joint, the second water jet pipe is located in the muddy water channel, matching of additional sealing pieces and the like is not needed, and the water jet pipe is convenient to use. On the basis of guaranteeing the sealing performance, the water supply mechanism is allowed to inject large water pressure into the first water jet pipe, the second water jet pipe and the third water jet pipe, the water jet washing capacity is improved, an energy spectrum rapidly destroys a mud cake, and the construction effect and efficiency are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering, and in particular relates to a mud-water shield high-pressure jet mud cake washing device, a method and a shield machine. Background Art

[0002] During the process of advancing, the slurry shield machine supplies mud into the cutterhead while excavating to maintain the pressure inside and outside the cutterhead of the shield machine, so as to achieve pressure balance and realize the purpose of rapid excavation. Slurry shield machines are often used for excavation in sandstone, soft strata with more soil and mud. During the excavation process, due to the soft strata, there is more soil and mud, which can easily stick to the cutterhead and form a mud cake. After the mud cake is formed, it is extremely difficult to clean it and it greatly affects the speed of excavation. The current way to alleviate the problem of cutterhead mud cake is mainly to add foam, bentonite, anti-adhesive agent and dispersant. However, when the addition is not timely or the stratum detection is incorrect, it often forms a mud cake, and it can only be handled by manual opening of the warehouse, which has a high safety risk.

[0003] In the current technology, a nozzle is arranged on the cutter disc, 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 arranged on the side wall of the rotation center, located outside the mud and water pipeline, and the water supply pipe requires the cooperation of seals and the like to ensure the 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, thereby resulting in limited water supply pressure, and the water jet flushing ability is insufficient to destroy the mud cake, or the destruction effect is poor and takes a 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 a first water jet pipe and a second water jet pipe are connected by a swivel 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 capacity, and can quickly destroy the mud cake, thereby ensuring the construction effect and efficiency.

[0005] In order to achieve the above-mentioned purpose, in the first aspect, the present invention provides a high-pressure jet washing mud cake device for a slurry shield, which adopts the following technical scheme: 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 swivel center and a cutterhead assembly; The swivel center includes a mud and water pipeline tee, a swivel 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 swivel joint, and a second water jet pipe is arranged at the other end of one end of the swivel joint, and the second water jet pipe is located in the mud and water channel; the cutter head 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.

[0006] Furthermore, a mud and water pipeline diverter valve is arranged at one end of the rotation center away from the mud and water pipeline tee; and a water jet diverter valve is arranged outside the mud and water pipeline diverter valve.

[0007] 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.

[0008] Furthermore, the cutter disc assembly is provided with a plurality of first nozzles and a plurality of second nozzles, the first nozzles are telescopic nozzles, and the second nozzles are fixed nozzles; the cutter disc assembly includes a cutter disc, and a plurality of slag outlets arranged on the cutter disc, and each slag outlet is provided with a first nozzle and a second nozzle.

[0009] Furthermore, the dimension of one end of the slag outlet close to the edge of the cutter disc is larger than the dimension of one 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.

[0010] 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 obliquely arranged at the end of the first nozzle water inlet pipe; a telescopic section is arranged 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 obliquely arranged at the end of the second nozzle water inlet pipe.

[0011] Furthermore, the cutter disc assembly is also provided with one or more of a third nozzle, a fourth nozzle and a fifth nozzle; the third nozzle is a rotating nozzle, the fourth nozzle is a pulse nozzle, and the fifth nozzle is a swinging nozzle.

[0012] Furthermore, the water supply mechanism includes a plurality of pumps, and the plurality of pumps 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.

[0013] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a method for jet flushing mud cake by increasing water pressure in a slurry shield, which adopts the following technical scheme: A method for flushing mud cake 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 injects water into a first water jet pipe, a second water jet pipe and a third water jet pipe, and flushes the mud cake by a water jet formed by a nozzle.

[0014] 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: A shield machine uses the mud-water shield high-pressure jet mud cake flushing device as described in the first aspect.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the swivel center includes a mud and water pipeline tee, a swivel 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 swivel joint, and the other end of the one end of the swivel 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 swivel 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 the sealing performance, 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 the mud cake can be quickly destroyed, thereby ensuring the construction effect and efficiency.

[0016] 2. The present invention is provided with a plurality of first nozzles and a plurality of 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 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; 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 a fixed nozzle is used at the end of the slag outlet with a smaller size to ensure flushing stability.

[0017] 3. In the present invention, the first nozzle is obliquely arranged at the end of the water inlet pipe of the first nozzle, and the second nozzle is obliquely arranged at the end of the water inlet pipe of the second nozzle, which ensures the direction of action of the water jet on the mud cake and improves the mud cake flushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0019] Figure 1 This is a schematic diagram of the structure of the device according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the rotation center structure of Example 1 of the present invention; Figure 3 It is a cross-sectional view of the rotation center of embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structure of a cutter head assembly according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the first nozzle structure of Example 1 of the present invention; Figure 6 A cross-sectional view of a first nozzle of Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the structure of the second nozzle of Example 1 of the present invention; Figure 8 A cross-sectional view of a second nozzle of Embodiment 1 of the present invention; Fig. 9 This is a schematic diagram of the structure of the third nozzle of Example 2 of the present invention; 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, cutter head assembly; 401, cutter head; 402, rock breaking roller; 4 03, slag outlet; 404, third water jet pipe; 405, mud water inlet pipe; 410, first nozzle; 4101, first nozzle water inlet pipe; 4102, telescopic section; 4103, first nozzle; 420, second nozzle; 4201, second nozzle water inlet pipe; 4202, fixed seat; 4203, second nozzle; 430, third nozzle; 4301, rotating part; 4302, third nozzle; 440, switch. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] 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 meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0022] Embodiment 1: like Figure 1 As shown, this embodiment provides a mud-water shield high-pressure jet mud cake flushing device, which can prevent the flushing of the cutter disc in advance or when the mud cake is formed, perform high-pressure flushing, thereby removing the mud cake, with high safety, prevention or real-time processing, high flushing efficiency, and the overall system is safe and stable. 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 cutter disc assembly 400.

[0023] The water supply mechanism 100 is a water supply device, which can be realized by existing technology, and can also adopt jet high pressure and ultra-high pressure large flow power system. In some embodiments, the water supply mechanism 100 can be an ultra-high pressure power system, which is the power source of the mud cake erosion mechanism, mainly providing 0 to 420Mpa jet power or 0 to 450L / min flow. At present, the water pressure and flow rate of eroding mud cake are inversely proportional. The greater the water pressure, the smaller the flow rate; the smaller the water pressure, the greater the flow rate.

[0024] In some embodiments, the water supply mechanism 100 is provided with multiple pumps, and the multiple pumps 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.

[0025] The first water jet pipe 200 can be a hose or a high-pressure hose, etc. In some embodiments, the first water jet pipe 200 can have an optional pressure range of 0 to 600 MPa, and is composed of six layers of materials, including steel mesh, polyoxymethylene POM, polyamide PA, etc. The flow rate can be customized after calculation.

[0026] 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.

[0027] 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 supporting frame 307, a water inlet 308 and a mud and water channel 309.

[0028] The swivel joint 301 is arranged at the end of the mud and water pipeline tee 302; the swivel joint 301 is a water pipe rotating joint, one end of which is connected to the first water jet pipe 200 through 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 swivel joint 301 is connected to the water supply mechanism 100. The second water jet pipe 306 is located in the mud and water channel 309, located in the middle of the mud and water channel 309; the second water jet pipe 306 is a high-pressure pipe, and in order to improve the stability of the second water jet pipe 306, a support frame 307 is arranged 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 one-to-many diverter valve block.

[0029] The main function of the swivel joint 301 is to transmit high-pressure water from one end to the rotating cutter disc at the other end to realize the supply of high-pressure water. The existing mud water shield machine, according to the size of the cutter disc diameter, has a hollow pipe wall with a diameter of several hundred millimeters in the middle. The pipe wall supplies mud mixture from the outside to the cutter disc pressure chamber to achieve the same pressure difference inside and outside the cutter disc, and supplies mud to the roller cutter for cooling. The key to the existing mud water shield machine equipped with a high-pressure jet system is the high-pressure water dynamic and static separation transmission technology of the swivel joint 301. The transmission scheme in this embodiment is to add the mud water pipeline tee 302 on the side away from the cutter disc 401, and the mud water is connected from the bottom, and the horizontal is the sealing and installation space of the swivel joint 301. The sealing of the swivel joint 301 meets the requirements, the mud supply pressure is 1Mpa, and the flow rate is three to five square meters per minute. Under this flow rate, the dynamic and static sealing of the swivel joint 301 meets the use environment.

[0030] In some embodiments, the 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 use conditions. The second water jet tube 306 needs to ensure the absolute center. Since the rotation center 300 is relatively long, a support frame 307 is added inside the mud and water channel 309, and a herringbone support frame is optionally provided to ensure the stability of the augmentation equipment.

[0031] The sealing performance of the swivel joint 301 can meet the environment of the mud 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 can ensure that the second water jet pipe 306 does not bend during rotation, and the space of the water jet diverter valve 305 can be adjusted as needed to adapt to the narrow installation environment of the cutter head 401.

[0032] 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 swivel joint 301, and 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 the 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.

[0033] like Figure 4 As shown, the cutterhead assembly 400 includes a cutterhead 401, a rock-breaking roller cutter 402, a slag outlet 403, a third water jet pipe 404 and a mud water 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 water inlet pipe 4101, a telescopic section 4102 and a first nozzle 4103; the second nozzle 420 includes a second nozzle water inlet pipe 4201, a fixing seat 4202 and a second nozzle 4203.

[0034] The cutter disc 401 and the rock breaking roller cutter 402 are conventional technologies. A plurality of slag outlets 403 are arranged on the cutter disc 401. In some embodiments, the cutter disc 401 is entirely made of high-pressure hard pipes and runs through the cable trough of the shield machine, thereby adding a layer of protection while reducing space occupancy.

[0035] 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 mud cake can be fully flushed by the telescopic nozzles.

[0036] Specifically, each slag outlet 403 is provided with a first nozzle 410 and a second nozzle 420. Moreover, the size area of ​​one end of the slag outlet 403 close to the edge of the cutter disc 401 is larger than the size area of ​​one end close to the center of the cutter disc 401; the first nozzle 410 is located at one end of the slag outlet 403 close to the edge of the cutter disc 401, and the second nozzle 420 is located at one end of the slag outlet 403 close to the center of the cutter disc 401. By changing the position of the water jet through the telescopic function of the telescopic nozzle, the mud cake at the larger end of the slag outlet 403 can be fully flushed, ensuring the mud cake flushing effect, and the fixed nozzle is used at the smaller end of the slag outlet 403 to ensure the flushing stability.

[0037] 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 arranged at the end of the first nozzle water inlet pipe 4101, and the first nozzle 4103 is arranged at an angle at the end of the first nozzle water inlet pipe 4101; a telescopic section 4102 is arranged on the first nozzle water inlet pipe 4101. The telescopic section 4102 can be an oil cylinder or other telescopic device, and the first nozzle water inlet pipe 4101 can be arranged at the end of the telescopic rod of the telescopic section 4102 to avoid the influence of the telescopic action; it can also be adopted that the middle of the telescopic section 4102 is set as a sealed telescopic rod and the first nozzle water inlet pipe 4101 is divided into two sections, which are respectively connected to the two ends of the sealed telescopic rod to achieve the telescopic function.

[0038] like Figure 7 and 8 As shown, the second nozzle 420 is a fan-shaped nozzle, and the second nozzle 420 includes a second nozzle water inlet pipe 4201 and a plurality of second nozzles 4203 arranged at the end of the second nozzle water inlet pipe 4201, and the second nozzles 4203 are obliquely arranged at the end of the second nozzle water inlet pipe 4201. The second nozzle 420 can be arranged on the blade 401 through a fixing seat 4202.

[0039] 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 action 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.

[0040] One of the working processes of the device in this embodiment is: 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, and the water of the water supply mechanism 100 flows from the water supply mechanism 100 through the first water jet pipe 200 and the swivel joint 301. The swivel 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 sprayed out from the first nozzle 410 and / or the second nozzle 420.

[0041] 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 washing the mud cake, the cutter head is extended a certain distance, and high-pressure water is sprayed from the first nozzle 4103. The first nozzle 4103 has two nozzles to choose from. The fan-shaped nozzle sprays to form an arc surface, and the straight nozzle sprays in a straight line, thereby washing the slag outlet 403 and washing the mud cake.

[0042] The second nozzle 420 is a fixed water jet, which is fixed on the cutter disc 401, with a tearing knife as the main body, passing through the inside of the tearing knife, and opening a hole on the side of the tearing knife. The second nozzle 4203 is also a fan-shaped or linear nozzle, so that the high-pressure jet is sprayed toward the slag outlet and the cutter disc surface.

[0043] Embodiment 2: This embodiment provides a high-pressure jet flushing mud cake device for a mud shield, which is different from the first embodiment in that a third nozzle 430, a fourth nozzle and a fifth nozzle are provided on the basis of the first nozzle 410 and the second nozzle 420 provided in the embodiment. The first nozzle 410, the second nozzle 420, the third nozzle 430, the fourth nozzle and the fifth nozzle can be selected to be set on the cutter head 401 to flush the mud cake, or two or more nozzles can be selected to be set on the cutter head 401 to flush the mud cake, so as to achieve the purpose of reducing blind spots and increasing the flushing range.

[0044] Optional, such as Fig. 9 As shown, the third nozzle 430 is a rotating nozzle, and a nozzle that can automatically rotate around its vertical axis by water pressure can be used. Alternatively, the third nozzle 430 includes a rotating part 4301 and a third nozzle 4302. The rotating part 4301 uses a power source such as a rotating motor, and a conversion head or conversion member is provided to realize the transmission of water flow during rotation. By providing a rotating nozzle, 360° water jet spraying can be achieved, increasing the flushing range.

[0045] 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 tubes, and the switch 440 is a controllable switch, which is opened and closed according to a preset frequency to realize pulsed injection of the water jet, thereby improving the effect of flushing the mud cake.

[0046] The fifth nozzle is a swing nozzle, which can be implemented 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 effect of washing the mud cake.

[0047] Embodiment 3: The present embodiment provides a method for flushing mud cakes by jetting a slurry shield with increased water pressure, and uses 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 flushes the mud cakes through the water jet formed by the nozzle.

[0048] Embodiment 4: This embodiment provides a shield machine, which uses the mud-water shield high-pressure jet mud cake flushing device as described in Example 1.

[0049] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present 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 swivel center includes a mud and water pipeline tee, a swivel 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 swivel joint, and a second water jet pipe is arranged at the other end of one end of the swivel joint, and the second water jet pipe is located in the mud and water channel; the cutter head 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.

2. A mud-water shield high-pressure jet washing mud cake device as claimed in claim 1, characterized in that: A mud and water pipeline diverter valve is arranged at one end of the rotation center away from the mud and water pipeline tee; a water jet diverter valve is arranged outside the mud and water pipeline diverter valve.

3. A mud-water shield high-pressure jet washing mud cake device as claimed in 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 arranged on multiple outlets of the water jet diverter valve.

4. A mud shield high-pressure jet washing mud cake device as claimed in claim 1, characterized in that: The cutter disc 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 cutter disc assembly comprises a cutter disc and a plurality of slag outlets arranged on the cutter disc, and each slag outlet is provided with a first nozzle and a second nozzle.

5. A mud-water shield high-pressure jet washing mud cake device as claimed in claim 4, characterized in that: 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.

6. A mud-water shield high-pressure jet washing mud cake device as claimed in claim 4, characterized in that: 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 arranged 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.

7. A mud-water shield high-pressure jet washing mud cake device as claimed in claim 4, characterized in that: The cutter head assembly is also provided with one or more of a third nozzle, a fourth nozzle and a fifth nozzle; the third nozzle is a rotating nozzle, the fourth nozzle is a pulse nozzle, and the fifth nozzle is a swinging nozzle.

8. A mud-water shield high-pressure jet washing mud cake device as claimed in claim 1, characterized in that: The water supply mechanism comprises 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.

9. A method for flushing mud cake by jetting in a mud shield with increased water pressure, characterized in that: A mud-water shield high-pressure jet mud cake flushing device as described in any one of claims 1 to 8 is used, comprising: a water supply mechanism injects water into the first water jet pipe, the second water jet pipe and the third water jet pipe, and the mud cake is flushed by the water jet formed by the nozzle.

10. 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 8 is used.

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