A method of shield construction and a shield cutter assembly

Abstract

The present application relates to a kind of shield construction method and shield cutterhead assembly, for shield construction method, the cutterhead of shield machine front end is excavated to stratum in the form of rotation, stratum soil is entered into soil cabin by the residue inlet set on cutterhead, stratum soil is also divided into soil block on the symmetric position along cutterhead center by residue inlet;Again, by eccentrically setting annular cutting tool cutting, be divided into non-soil block along cutterhead center symmetry;For shield cutterhead assembly, it includes: cutterhead, cutter beam, cutterhead center part, cutterhead outer ring, cutterhead inner ring, faceplate, fish tail cutter, scraper, leading cutter, scraper, tear cutter, annular cutting tool, longitudinal beam, main drive component, front shield, screw conveyor.The present application can further cut soil block into the form of shape, size, position asymmetry and not equal, be beneficial to the flow of soil body by eccentrically setting annular cutter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shield construction, in particular to a shield construction method.

[0002] The present application also relates to a shield cutter disc assembly for implementing the shield construction method. BACKGROUND

[0003] As disclosed in Chinese Patent Publication No. CN 201241710Y, a shield cutter disc for sandy pebble stratum is provided, in which the residue inlet is designed symmetrically along the center of the cutter disc. After the soil blocks are cut, a pair of soil blocks with extremely similar shape and size will exist at the symmetric position, especially in the middle region. The distance between the soil blocks is close, and the soil blocks are easily pressed against each other. When the shape and size of the soil blocks are close to each other, the force is also close, and the force difference is small. Therefore, the total acceleration of the movement of the soil blocks is small, and the soil blocks are easily stayed in the middle region of the cutter disc. Especially, the soil in the middle region of the cutter disc is pressed by the soil around, and is not easy to move. When the flowability of the soil in the middle region of the cutter disc is reduced, more and more soil blocks are stayed, and the soil in the middle region of the cutter disc is more easily to form a mud cake, which affects the shield propulsion and is not easy to clean. SUMMARY

[0004] The purpose of the present application is to provide a shield construction method, which can further cut the soil blocks into the form of asymmetric and unequal shape, size and position by using the eccentric ring cutter, so as to facilitate the flow of the soil, and the eccentric ring cutter is more easily to form a spiral conveying form in the process of shield propulsion, which is more beneficial to the conveying of the soil and improves the efficiency.

[0005] Another purpose of the present application is to provide a shield cutter disc assembly for implementing the shield construction method.

[0006] For the shield construction method, the specific steps include the following steps:

[0007] The cutter disc at the front end of the shield machine is rotated to excavate the stratum, and the stratum soil enters the soil cabin through the residue inlet provided on the cutter disc. The residue inlet is symmetrically arranged along the center of the cutter disc, and the stratum soil is also divided into soil blocks at the symmetric position along the center of the cutter disc by the residue inlet.

[0008] The soil in the middle region of the cutter disc is further cut by the eccentric ring cutter provided eccentrically to the center of the cutter disc, and is divided into soil blocks not at the symmetric position along the center of the cutter disc, and then enters the soil cabin.

[0009] The eccentric ring cutter is beneficial to increase the resultant force of the soil in the middle region in a certain direction or the absolute value of the force difference, so as to improve the acceleration of the movement of the soil, improve the flowability of the soil, and reduce the accumulation of the soil in the middle region of the cutter disc.

[0010] The shield cutter assembly comprises:

[0011] The cutter head arranged at the front end of the shield machine comprises a plurality of cutter beams uniformly distributed in a ring direction, the cutter beams are distributed in a radial direction of the cutter head, one end of the cutter beam is fixed to a central part of the cutter head, the other end of the cutter beam is fixed to an outer ring of the cutter head, the middle part of the cutter beam is fixed to an inner ring of the cutter head, a plurality of uniformly distributed panels are distributed between the outer ring of the cutter head and the inner ring of the cutter head; the panels, the outer ring of the cutter head, the inner ring of the cutter head, the cutter beams and the central part of the cutter head divide a plurality of slag inlets symmetrically along the center of the cutter head;

[0012] The fish tail cutter arranged on the central part of the cutter head;

[0013] The scraper arranged on both sides of the cutter beam, the scraper is axially distributed in a plurality of intervals and is arranged in pairs;

[0014] The leading cutter arranged on the cutter beam and the panel, the leading cutter is arranged in the middle of the pair of scrapers on the cutter beam;

[0015] The tearing cutter arranged on the outer ring of the cutter head;

[0016] The eccentric cutter arranged on the outer ring of the cutter head, the longitudinal beam passes through and is fixed, the longitudinal beam is fixed on the cutter beam after passing through the eccentric cutter, the longitudinal beam corresponds to the cutter beam one by one, the eccentric cutter has a triangular cross section, the soil is cut by the sharp corner and is guided into the soil chamber by the inclined surface;

[0017] The main drive assembly arranged behind the central part of the cutter head for driving the cutter head to rotate;

[0018] The front shield for erecting the main drive assembly, the soil chamber is formed between the front shield and the cutter head;

[0019] The screw conveyor passing through the front shield and extending into the soil chamber.

[0020] With the structure, the eccentric cutter can rotate synchronously with the cutter head, but the rotation of the eccentric cutter at the eccentric position not only helps to form a spiral conveying form, but also further cuts the soil block, after the secondary cutting, the soil block in the middle part of the cutter head is no longer symmetrical, the stress becomes more uneven, the force difference is larger, and the moving acceleration is easier to improve, so that the purpose of improving the fluidity of the soil in the middle part of the cutter head is achieved.

[0021] As a further improvement of the shield cutter assembly, the eccentric cutter is inscribed in the inner ring of the cutter head, and the eccentric cutter wants to cross the central part of the cutter head, so that the number of cutter beams and the number of longitudinal beams are both even numbers, the distance between every two longitudinal beams and the center of the cutter head is equal, a plurality of ring tracks concentric with the cutter head are arranged in front of the partition plate in the front shield, a ring slider is slidably matched in the ring track, and each ring slider corresponds to two longitudinal beams; the longitudinal beam extends to the partition plate and is fixed on the ring slider, so that the longitudinal beam supporting the cutter beam has a plurality of moving paths.

[0022] With such a structure, the longitudinal beams distributed on each cutter beam of the cutter head increase the support range, and each cutter beam is also an eccentric ring, and the support points are arranged in a staggered manner, which is beneficial to the stable rotation of the cutter head and the prevention of the inclination or deviation of the cutter head, or other bearing assemblies are used instead of the ring rail to enable the ring-shaped slider to rotate with the cutter head.

[0023] When each 2 longitudinal beams share a moving path, multiple moving paths are used, the moving interference between them is small, and the longitudinal beam fixed by a ring-shaped slider is also less, so the load borne or transmitted by a single ring-shaped slider is also small, which is beneficial to guarantee the overall structural rigidity and strength, improve the service life, reduce the damage rate, and is also more beneficial to maintenance and replacement.

[0024] As a further improvement of the shield cutter head assembly, the main drive assembly includes a main bearing arranged on the center area of the partition plate, the outer ring of the main bearing is fixed on the front shield, the inner ring of the main bearing is fixed on the main drive shaft, one end of the main drive shaft in front of the front shield is fixed on the back of the center part of the cutter head, and the other end of the main drive shaft in back of the front shield is fixed on the driven gear. A plurality of driving gears are distributed at intervals with the driven gear as the center, the driving gears are engaged with the driven gear, and the driving gears are driven by a plurality of main reduction motors arranged on the back of the partition plate.

[0025] With such a structure, the partition plate separates the soil from most of the main drive assembly to prevent the influence of the muck on the operation of the main drive assembly. Then, a plurality of driving gears are used to drive a driven gear to rotate to ensure sufficient torque.

[0026] With such a structure, a large main reduction motor is not used for single driving, but a plurality of main reduction motors are used for driving, the driving sources are more, the safety factor is higher, and the device cannot be used if one of them is broken. In addition, it is also convenient for maintenance and replacement.

[0027] As a further improvement of the shield cutter head assembly, the main reduction motor is arranged in a ring-shaped installation channel, a plurality of installation grooves for accommodating the main reduction motor are arranged in the installation channel, and the installation channel is arranged on the back of the partition plate.

[0028] The installation channel is convenient for accommodating and accommodating the main reduction motor, which is beneficial to the protection of the main reduction motor.

[0029] As a further improvement of the shield cutter disc assembly, the cutter beam is provided with a foam-bentonite nozzle assembly on one side, which comprises a mounting plate fixed on one side of the cutter beam, and a sleeve pipe penetrating through the mounting plate and fixed, an inner nozzle detachably connected with the sleeve pipe, inserted into the sleeve pipe from the rear end of the sleeve pipe, and a cap provided on the sleeve pipe; a centrifugal drive reduction motor is arranged in the cap, an output shaft of the centrifugal drive reduction motor is fixed with a tee pipe, the tee pipe is communicated with the inner nozzle in the sleeve pipe, a lateral opening is provided on the surface of the cap and communicated with the tee pipe, and the tee pipe is adapted with the inner side of the cap to rotate in the cap to generate centrifugal force.

[0030] With the structure, the cap prevents the soil from being pressed into the sleeve pipe in the axial direction, prevents blockage, and affects the spraying of the foam or bentonite by the inner nozzle; the centrifugal drive reduction motor rotates the tee pipe to generate centrifugal force, so that the muck in the tee pipe can be thrown out to further prevent blockage; if blockage occurs, the inner nozzle can be removed from the back of the cutter disc for replacement.

[0031] As a further improvement of the shield cutter disc assembly, a stirring assembly is arranged on the partition plate, the stirring assembly comprises a stirring rod arranged in front of the partition plate and a stirring reduction motor drive arranged behind the partition plate, and a driving shaft of the stirring reduction motor is rotatably connected with the stirring rod penetrating through the partition plate.

[0032] With the structure, the stirring rod can stir the muck in the soil tank to increase the flowability of the muck and prevent the formation of mud cake in the soil tank.

[0033] The eccentrically arranged annular cutter can further cut the soil into an asymmetric and unequal form in shape, size and position, which is beneficial to the flow of the soil, and the eccentrically arranged annular cutter is more likely to form a spiral conveying form in the process of shield progression, which is more beneficial to the conveying of the soil and improves the efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structural schematic view of an embodiment.

[0035] Figure 2 It is a structural schematic view of an embodiment after removing the cutter disc.

[0036] Figure 3 It is a structural schematic view of the back of the front shield.

[0037] Figure 4 It is a structural schematic view of the foam-bentonite nozzle assembly.

[0038] Reference numerals: 100, cutter head; 101, cutter beam; 102, panel; 103, soil chamber; 104, fishtail cutter; 105, slag inlet; 106, scraper; 107, leading cutter; 108, tearing cutter; 109, stirring rod; 110, stirring reduction motor; 111, ring cutting cutter; 112, center of cutter head; 113, outer ring of cutter head; 114, inner ring of cutter head; 115, longitudinal beam; 200, main drive assembly; 201, main shaft. 202. Main drive shaft; 203. Driven gear; 204. Drive gear; 205. Main geared motor; 300. Front shield; 301. Middle partition; 302. Ring rail; 303. Annular slider; 400. Screw conveyor; 500. Foam-bentonite nozzle assembly; 501. Mounting plate; 502. Outer sleeve; 503. Inner nozzle; 504. Protective cap; 505. T-pipe; 506. Side opening; 600. Mounting channel; Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example 1

[0042] like Figures 1-4 As shown, a shield tunneling construction method specifically includes the following steps:

[0043] The cutterhead 100 at the front end of the shield machine is rotated to excavate the stratum, and the stratum soil enters the soil cabin 103 through the residue inlet 105 provided on the cutterhead 100. The residue inlet 105 is symmetrically arranged along the center of the cutterhead 100, and the stratum soil is also divided into soil blocks along the symmetric position of the center of the cutterhead 100 by the residue inlet 105;

[0044] The soil in the middle region of the cutterhead 100 is cut by the eccentric ring cutter 111 after being divided by the residue inlet 105, and is divided into soil blocks that are not symmetrically arranged along the center of the cutterhead 100 and then enters the soil cabin 103;

[0045] The eccentric ring cutter 111 is beneficial to increase the resultant force of the soil in the middle region in a certain direction or increase the absolute value of the force difference, thereby increasing the acceleration of the soil movement and improving the fluidity of the soil, and reducing the accumulation of the soil in the middle region of the cutterhead.

[0046] Embodiment 2

[0047] A shield cutterhead assembly comprises:

[0048] The cutterhead 100 provided at the front end of the shield machine comprises a plurality of cutter beams 101 uniformly distributed in a ring shape, the cutter beams 101 are distributed radially along the cutterhead 100, one end of the cutter beam 101 is fixed to the center part 112 of the cutterhead, the other end of the cutter beam 101 is fixed to the outer ring 113 of the cutterhead, the middle part of the cutter beam 101 is fixed to the inner ring 114 of the cutterhead, a plurality of uniformly distributed face plates 102 are distributed between the outer ring 113 of the cutterhead and the inner ring 114 of the cutterhead, and the face plates 102, the outer ring 113 of the cutterhead, the inner ring 114 of the cutterhead, the cutter beams 101 and the center part 112 of the cutterhead divide a plurality of residue inlets 105 symmetrically arranged along the center of the cutterhead 100;

[0049] The fish tail cutter 104 provided on the center part 112 of the cutterhead;

[0050] The scrapers 106 provided on both sides of the cutter beam 101 are axially spaced and arranged in pairs;

[0051] The leading cutters 107 provided on the cutter beam 101 and the face plate 102 are arranged between the paired scrapers 106 on the cutter beam 101;

[0052] The tear cutter 108 provided on the outer ring 113 of the cutterhead;

[0053] The eccentric ring cutter 111 eccentric to the center of the cutterhead 100 is horizontally penetrated and fixed by the longitudinal beam 115, the longitudinal beam 115 is fixed on the cutter beam 101 after penetrating the ring cutter 111, and the longitudinal beam 115 corresponds to the cutter beam 101 one by one;

[0054] The main drive assembly 200 is arranged behind the center part 112 of the cutter head 100, and is used to drive the cutter head 100 to rotate;

[0055] The front shield 300 is used to support the main drive assembly 200, and the front shield 300 and the cutter head 100 form a soil chamber 103;

[0056] The screw conveyor 400 is arranged through the front shield 300 and extends into the soil chamber 103.

[0057] With the above structure, the eccentrically arranged ring cutter 111 can rotate synchronously with the cutter head 100, and the rotation of the ring cutter 111 at the eccentric position is beneficial to form a spiral conveying form and further cut the soil blocks. After the secondary cutting, the soil blocks in the middle region of the cutter head 100 are no longer symmetrical, the stress becomes more uneven, the force difference is larger, and the lifting acceleration is easier to improve, so that the purpose of improving the fluidity of the soil in the middle region of the cutter head 100 is achieved.

[0058] In the embodiment, the ring cutter 111 is tangent to the inner ring 114 of the cutter head, and the ring cutter 111 needs to pass through the center part 112 of the cutter head. Therefore, the number of the cutter beams 101 and the number of the longitudinal beams 115 are both even numbers, the distance between every two longitudinal beams 115 and the center of the cutter head 100 is equal, a plurality of ring tracks 302 concentric with the cutter head 100 are arranged in front of the partition plate 301 in the front shield 300, a plurality of ring-shaped sliding blocks 303 are slidably arranged in the ring tracks 302, and each ring-shaped sliding block 303 corresponds to two longitudinal beams 115. The longitudinal beams 115 extend to the partition plate 301 and are fixed on the ring-shaped sliding blocks 303, so that the longitudinal beams 115 supporting the cutter beams 101 have a plurality of moving paths.

[0059] With the above structure, the longitudinal beams 115 distributed on each cutter beam 101 of the cutter head 100 increase the supporting range, and each cutter beam 101 forms an eccentric ring, and the support points are arranged in a staggered manner, which is beneficial to the stable rotation of the cutter head 100 and prevents the cutter head 100 from tilting or deviating.

[0060] When every two longitudinal beams 115 share one moving path, a plurality of moving paths are used, the moving interference between them is small, the longitudinal beams 115 fixed on one ring-shaped sliding block 303 are also less, the load borne or transmitted by a single ring-shaped sliding block 303 is also small, which is beneficial to guarantee the rigidity and strength of the overall structure, improve the service life, reduce the damage rate, and is also beneficial to maintenance and replacement.

[0061] In the embodiment, the main drive assembly 200 comprises a main bearing 201 arranged at the center region of the partition plate 301, the outer ring of the main bearing 201 is fixed on the front shield 300, and the inner ring is fixed on the main drive shaft 202, one end of the main drive shaft 202 in front of the front shield 300 is fixed on the back of the center part 112 of the cutter head, the other end of the main drive shaft 202 behind the front shield 300 is fixed on the driven gear 203, a plurality of driving gears 204 are distributed at intervals around the driven gear 203, the driving gears 204 are engaged with the driven gear 203, and the driving gears 204 are driven by a plurality of main reduction motors 205 arranged on the back of the partition plate 301.

[0062] With such a structure, the partition plate 301 separates the soil from most of the main drive assembly 200, preventing the soil from affecting the operation of the main drive assembly 200. Then, a plurality of driving gears drive a driven gear 203 to rotate to ensure sufficient torque.

[0063] With such a structure, a large main reduction motor 205 is not used for single driving, but a plurality of main reduction motors 205 are used for driving, the driving source is more, the safety factor is higher, and one bad motor cannot be used. In addition, it is also convenient for maintenance and replacement.

[0064] In the embodiment, the main reduction motor 205 is arranged in the annular mounting groove 600, a plurality of mounting grooves for accommodating the main reduction motor 205 are arranged in the mounting groove 600, and the mounting groove 600 is arranged on the back of the partition plate 301.

[0065] The mounting groove 600 facilitates the accommodation and arrangement of the main reduction motor 205, and is conducive to the protection of the main reduction motor 205.

[0066] In the embodiment, the cutter beam 101 is provided with a foam-bentonite spout assembly 500 on one side, which comprises a mounting plate 501 fixed on one side of the cutter beam 101, an outer sleeve 502 penetrating through the mounting plate 501 and being fixed, an inner spout 503 detachably connected with the outer sleeve 502, the inner spout 503 is inserted into the outer sleeve 502 from the rear end of the outer sleeve 502, and a cap 504 is arranged on the outer sleeve 502; a centrifugal drive reduction motor is arranged in the cap 504, an output shaft of the centrifugal drive reduction motor is fixed with a tee 505, the tee 505 is connected with the inner spout 503 in the outer sleeve 502, a lateral opening 506 is arranged on the surface of the cap 504 and can communicate with the tee 505 in the cap 504, and the tee 505 is adapted with the inner side of the cap 504 to rotate in the cap 504 to generate centrifugal force.

[0067] With such structure, the cap 504 prevents the soil from being pressed into the outer sleeve 502 in the axial direction, preventing the blockage and affecting the inner nozzle 503 to spray the foam or bentonite. The centrifugal drive reduction motor rotates the tee pipe 505, generating centrifugal force, so that the sludge entering the tee pipe 505 can be thrown out, further preventing blockage. If blockage occurs, the inner nozzle 503 can be removed from the back of the cutter head 100 for easy replacement.

[0068] In the embodiment, the partition plate 301 is provided with a stirring assembly, which includes a stirring rod 109 arranged in front of the partition plate 301 and a stirring reduction motor 110 arranged behind the partition plate 301 and driving the stirring rod 109. The driving shaft of the stirring reduction motor 110 is rotatably connected to the stirring rod 109.

[0069] With such structure, the stirring rod 109 can stir the sludge in the soil cabin, increasing the flowability of the sludge and preventing the formation of mud cake in the soil cabin.

[0070] In the embodiment, the cutter head 100 is arranged at the front end of the shield tunneling machine and excavates the stratum in a full-face mode by rotation.

[0071] The cutter head 100 is provided with six cutter beams 101 and six face plates 102. The cutter beam 101 has a round pipe structure, and the face plate 102 has a thick steel plate. The opening rate of the cutter head 100 is greater than 43%, so that the sludge enters the soil cabin 103.

[0072] The water flushing system is arranged in the central region of the cutter head 100 to prevent the formation of mud cake in the central region of the soil cabin 103.

[0073] The central cone structure of the fish tail cutter directs the central sludge to the peripheral sludge inlet 105.

[0074] The various cutters are arranged in different heights to improve the cutting efficiency.

[0075] The above is a further detailed description of the present application in combination with the specific preferred embodiments, which cannot be regarded as the limitation of the specific implementation of the present application. For those skilled in the art to which the present application belongs, without departing from the concept of the present application, a number of equivalent alternatives or obvious modifications can be made, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present application.

Claims

1. A shield tunneling construction method, which specifically includes the following steps: The cutterhead (100) at the front end of the tunnel boring machine is rotated to excavate the stratum, so that the stratum soil enters the soil chamber (103) through the slag inlet (105) set on the cutterhead (100). The slag inlet (105) is symmetrically set along the center of the cutterhead, and the stratum soil is also divided into soil blocks at symmetrical positions along the center of the cutterhead (100) by the slag inlet (105). The soil in the central area of ​​the cutterhead (100) is divided by the slag inlet (105) and then cut by the ring cutting tool (111) set eccentrically to the center of the cutterhead (100). It is divided into soil blocks that are not symmetrical about the center of the cutterhead (100) and then enters the soil chamber (103). in, A shield tunnel cutterhead assembly is used, the shield cutterhead assembly comprising: The cutterhead (100) at the front end of the tunnel boring machine includes multiple cutter beams (101) evenly distributed in a circumferential direction. The cutter beams (101) are radially distributed along the cutterhead (100). One end of the cutter beam (101) is fixed to the center part (112) of the cutterhead, and the other end of the cutter beam (101) is fixed to the outer ring (113) of the cutterhead. The middle part of the cutter beam (101) is fixed to the inner ring (114) of the cutterhead. Multiple evenly distributed panels (102) are distributed between the outer ring (113) and the inner ring (114) of the cutterhead. Multiple slag inlets (105) are divided into the panels (102), the outer ring (113) of the cutterhead, the inner ring (114) of the cutterhead, the cutter beams (101) and the center part (112) of the cutterhead. A fishtail blade (104) is mounted on the center of the blade disc (112). The scrapers (106) are arranged on both sides of the blade beam (101). Multiple scrapers (106) are distributed at intervals along the axial direction of the blade beam (101) and are arranged in pairs. A leading blade (107) is provided on the blade beam (101) and the panel (102). On the blade beam (101), the leading blade (107) is positioned between a pair of scrapers (106). A tearing blade (108) is mounted on the outer ring (113) of the cutter head. The ring cutting tool (111) is eccentric to the center of the cutter head (100). It is horizontally passed through and fixed by the longitudinal beam (115). After passing through the ring cutting tool (111), the longitudinal beam (115) is fixed on the cutter beam (101). The longitudinal beam (115) and the cutter beam (101) correspond one-to-one. A main drive assembly (200) is located behind the center part (112) of the cutter head, for driving the cutter head (100) to rotate; The front shield (300) is used to mount the main drive assembly (200), and the soil chamber (103) is between the front shield (300) and the cutterhead (100). A screw conveyor (400) passes through the front shield (300) and extends into the earth chamber (103); The circumferential cutting tool (111) is tangent to the inner ring (114) of the cutter head, and the circumferential cutting tool (111) must pass through the center part (112) of the cutter head. This makes the number of cutter beams (101) and the number of longitudinal beams (115) even. Then, the distance between each pair of longitudinal beams (115) and the center of the cutter head (100) is equal. Multiple annular rails (302) concentric with the cutter head (100) are set in front of the partition plate (301) of the front shield (300). Circular sliders (303) are slidably fitted in the annular rails (302). Each annular slider (303) corresponds to two longitudinal beams (115). The longitudinal beams (115) extend towards the partition plate (301) and are fixed on the annular sliders (303). This makes the longitudinal beams (115) supporting the cutter beams (101) have multiple movement paths. The main drive assembly (200) includes a main bearing (201) mounted in the central area of ​​the partition plate (301). The outer ring of the main bearing (201) is fixed on the front shield (300), and its inner ring is fixed on the main drive shaft (202). One end of the main drive shaft (202) in front of the front shield (300) is fixed on the back of the center part (112) of the cutter head. The other end of the main drive shaft (202) behind the front shield (300) is fixed with a driven gear (203). Multiple drive gears (204) are distributed at intervals with the driven gear (203) as the center. The drive gears (204) mesh with the driven gears (203). The drive gears (204) are driven by multiple main reduction motors (205) mounted on the back of the partition plate (301). The main geared motor (205) is disposed in a circumferential mounting channel (600), and the mounting channel (600) is provided with a plurality of mounting slots for mounting the main geared motor (205). The mounting channel (600) is disposed on the back of the partition plate (301). The blade beam (101) is provided with a foam-bentonite nozzle assembly (500) on one side, which includes a mounting plate (501) fixed on one side of the blade beam (101), and an outer sleeve (502) passing through the mounting plate (501) and fixed thereon. An inner nozzle (503) is detachably connected to the outer sleeve (502) and is inserted from the rear end of the outer sleeve (502). A protective cap (504) is provided on the outer sleeve (502). The protective cap (504) has a built-in centrifugal drive reduction motor. A three-way pipe (505) is fixed to the output shaft of the centrifugal drive reduction motor. The three-way pipe (505) is connected to the inner nozzle (503) in the outer sleeve (502). A lateral opening (506) is provided on the surface of the protective cap (504) to connect to the three-way pipe (505) inside. The outer side of the three-way pipe (505) is adapted to the inner side of the protective cap (504) so ​​that it can rotate in the protective cap (504) to generate centrifugal force.

2. The shield tunneling method according to claim 1, characterized in that, A stirring assembly is mounted on the partition plate (301). The stirring assembly includes a stirring rod (109) in front of the partition plate (301) and a stirring reduction motor (110) behind the partition plate (301). The drive shaft of the stirring reduction motor (110) rotatably passes through the partition plate (301) and is fixed to the stirring rod (109).

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