Shield cutterhead for cutting diaphragm wall with steel i-beam

Abstract

A shield cutterhead for cutting a diaphragm wall with steel I-beam comprises a cutterhead body, a plurality of main cutter beams, an auxiliary cutter beam, a central double-disc roller cutter, and a tool group. The central double-disc roller cutter is arranged at a center of a working face of the cutterhead body and connected to the plurality of main cutter beams. The plurality of main cutter beams are arranged radially along the cutterhead body. The auxiliary cutter beam is arranged between adjacent main cutter beams. The tool group is mounted on the plurality of main cutter beams and the auxiliary cutter beam. Each of the central double-disc roller cutter, the plurality of main cutter beams, and the auxiliary cutter beam are arranged in six different tiers from a center to an edge of the cutterhead body based on heights of the central double-disc roller cutter and the tool group.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of priority from Chinese Patent Application No. 202510674079.4, filed on May 23, 2025. The content of the aforementioned application, including any intervening amendments made thereto, is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This application relates to tunnel engineering, and more particularly to a shield cutterhead for cutting a diaphragm wall with a steel I-beam.BACKGROUND

[0003] With the continuous development of urban subway construction, newly built subway lines frequently pass beneath existing subway lines, especially in subway transfer stations where shield tunneling is widely used to traverse beneath the existing subway lines. Due to various reasons, many existing stations were not designed to accommodate shield tunneling underneath. In particular, the underground diaphragm walls with I-beam joints cast in existing stations pose significant obstacles to new shield tunneling projects.

[0004] Current solutions typically involve constructing clearance wells to manually break down and backfill the diaphragm walls before allowing the shield machine to pass through. However, these methods face significant challenges due to surrounding environments, existing pipelines, and ground traffic diversion, resulting in high construction difficulty, substantial costs, prolonged schedules, and elevated safety risks. Although there have been successful cases in China where shield machines traversed diaphragm walls without I-beam joints, issues such as severe cutter wear, excessively long cutting steel bars, and steel bar entanglement around the cutterhead remain prevalent. These problems need to stop the machine opening the cutterhead chamber for tool inspection and replacement, causing construction delays and increased risks.

[0005] To date, there are no domestic cases or experiences regarding shield tunneling directly through diaphragm walls with I-beam steel joints. When the shield machine directly traverses the diaphragm walls with I-beam steel joints, it is highly prone to tool damage and cutterhead jamming caused by large I-beam sections. Conventional cutterhead and tool configurations face multiple challenges, including low cutting efficiency, rapid tool wear, inability to effectively cut I-beam steels, and failure to efficiently transport overly long I-beam steels and steel bars into the soil chamber. Moreover, excessively long steel bars and I-beam steels risk jamming the screw conveyor, further hindering shield tunneling progress.SUMMARY

[0006] To address the aforementioned problems, this application provides a shield cutterhead for cutting a diaphragm wall with a steel I-beam. The concept involves the composite multi-tiered conical cutterhead that employs roller cutters as the primary cutting tools while rationally configuring other tools such as ripper cutters, thereby addressing the challenge of insufficient capability in cutting I-beams when the shield machine traverses diaphragm walls with steel I-beams.

[0007] Technical solutions of the present disclosure are described as follows.

[0008] This application provides a shield cutterhead for cutting a diaphragm wall with a steel I-beam, comprising:

[0009] a cutterhead body;

[0010] a plurality of main cutter beams;

[0011] an auxiliary cutter beam;

[0012] a central double-disc roller cutter; and

[0013] a tool group;

[0014] wherein the cutterhead body is circular; the central double-disc roller cutter is arranged at a center of a working face of the cutterhead body; the central double-disc roller cutter is connected to the plurality of main cutter beams; the plurality of main cutter beams are arranged radially along the cutterhead body; and the auxiliary cutter beam is arranged between adjacent main cutter beams;

[0015] the tool group is mounted on the plurality of main cutter beams and the auxiliary cutter beam; the central double-disc roller cutter, the plurality of main cutter beams, and the auxiliary cutter beam are divided in six tiers from a center of the cutterhead body to an edge of the cutterhead body based on heights of the central double-disc roller cutter and the tool group; the six tiers comprise a first tier, a second tier, a third tier, a fourth tier, a fifth tier, and a sixth tier, with height decreasing progressively; and the central double-disc roller cutter is the first tier;

[0016] the tool group comprises a single disc cutter, a replaceable ripper, a welded ripper, an edge scraper, and a cutting knife; and

[0017] a plurality of foam nozzles are arranged on the working face of the cutterhead body.

[0018] In an embodiment, the plurality of main cutter beams comprise a first cutter beam, a second cutter beam, a third cutter beam, and a fourth cutter beam arranged clockwise on the working face of the cutterhead body; and

[0019] the auxiliary cutter beam comprises a fifth cutter beam, a sixth cutter beam, a seventh cutter beam, and an eighth cutter beam; the fifth cutter beam is arranged between the first cutter beam and the second cutter beam; the sixth cutter beam is arranged between the second cutter beam and the third cutter beam; the seventh cutter beam is arranged between the third cutter beam and the fourth cutter beam; and the eighth cutter beam is arranged between the fourth cutter beam and the first cutter beam.

[0020] In an embodiment, an end of each main cutter beam close to the center of the cutterhead body is an inner end, and an other end of each main cutter beam is an outer end; and

[0021] the tool group on each main cutter beam is arranged from the inner end to the outer end as follows:

[0022] a second tier of the first cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a third tier of the first cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fourth tier of the first cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fifth tier of the first cutter beam is equipped with one replaceable ripper and one welded ripper; a sixth tier of the first cutter beam is equipped with three single disc cutters and two welded rippers;

[0023] a second tier of the second cutter beam is equipped with one replaceable ripper; a third tier of the second cutter beam is equipped with one replaceable ripper, with one cutting knife on each side respectively; a fourth tier of the second cutter beam is equipped with one single disc cutter, one replaceable ripper, and one welded ripper, with one cutting knife on each side respectively; a fifth tier of the second cutter beam is equipped with one single disc cutter; a sixth tier of the second cutter beam is equipped with two single disc cutters and one welded ripper;

[0024] a second tier of the third cutter beam is equipped with one cutting knife on each side respectively; a third tier of the third cutter beam is equipped with one single disc cutter, one replaceable ripper, and one welded ripper, with one cutting knife positioned on each side respectively; a fourth tier of the third cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fifth tier of the third cutter beam is equipped with one single disc cutter; and a sixth tier of the third cutter beam is equipped with two single disc cutters; and

[0025] a second tier of the fourth cutter beam is equipped with one single disc cutter; a third tier of the fourth cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fourth tier of the fourth cutter beam is equipped with one replaceable ripper and one welded ripper, with one cutting knife on each side respectively; a fifth tier of the fourth cutter beam is equipped with one single disc cutter, one replaceable ripper, and one welded ripper; and a sixth tier of the fourth cutter beam is equipped with two single disc cutters and two welded rippers.

[0026] In an embodiment, the tool group on each auxiliary cutter beam is arranged from the inner end to the outer end as follows:

[0027] a third tier of the fifth cutter beam is equipped with one welded ripper; a fourth tier of the fifth cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; a fifth tier of the fifth cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; and a sixth tier of the fifth cutter beam is equipped with one single disc cutter, with one edge scraper on each side respectively;

[0028] a fourth tier of the sixth cutter beam is equipped with one welded ripper; a fifth tier of the sixth cutter beam is equipped with two welded rippers, with one cutting knife on each side respectively; a sixth tier of the sixth cutter beam is equipped with one single disc cutter, with one cutting knife and one edge scraper on each side respectively;

[0029] a fourth tier of the seventh cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; a fifth tier of the seventh cutter beam is equipped with one cutting knife on each side respectively; and a sixth tier of the seventh cutter beam is equipped with one single disc cutter and two welded rippers, with one edge scraper on each side respectively; and

[0030] a third tier of the eighth cutter beam is equipped with one welded ripper; a fourth tier of the eighth cutter beam is equipped with one welded ripper; a fifth tier of the eighth cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; and a sixth tier of the eighth cutter beam is equipped with one single disc cutter, with one cutting knife and one edge scraper on each side respectively.

[0031] In an embodiment, a periphery of the cutterhead body is equipped with a wear-resistant protection device. The wear-resistant protection device includes a wear-resistant alloy block and a wear-resistant steel plate alternately arranged along the periphery of the cutterhead body. By alternately arranging the wear-resistant alloy block 101 and the wear-resistant steel plate, cutterhead wear is reduced.

[0032] In an embodiment, a radial width of each tier in the six tiers is 500 mm.

[0033] In an embodiment, the central double-disc roller cutter 4 includes four parallel cutting tools, each with a height of 368-388 mm, and the spacing between adjacent parallel cutting tools is 90 mm. Such central double-disc roller cutter exhibits high cutting capacity, durability, and reliability. During shield tunneling, the central double-disc roller cutter can first cut off the bottom flange plate of the steel I-beam from the center while simultaneously avoiding the issue where tools that initially engage with soil are prone to damage and lack endurance.

[0034] In an embodiment, the number of the foam nozzles is six, and each foam nozzle is independently connected to a single pump via a dedicated pipeline.

[0035] Twenty-five single disc cutters are configured, each with a height of 188-348 mm, and the spacing between adjacent single disc cutters is 100 mm. The single disc cutter can cut through I-beam steel plates and reinforcement bars, while driving uncut I-beam steel plates and uncut reinforcement bars toward the outside of the tunnel, effectively preventing large steel plates from obstructing the tunneling process. The single disc cutters are arranged in a layered layout, which helps reduce the length of the cut I-beam steel and reinforcement bars.

[0036] The seven replaceable rippers are configured, each with a height of 188-308 mm, and the spacing between adjacent replaceable rippers is 100 mm. The replaceable rippers can cut I-beam steel plates and reinforcement bars, and can be easily replaced when worn.

[0037] The twenty-three welded rippers are configured, each with a height of 148-308 mm, and a spacing between adjacent welded rippers 200-300 mm. The welded rippers are more robust and exhibit enhanced capability in cutting I-beams and reinforcement bars.

[0038] The eight edge scrapers are configured, each with a height of 135 mm, and a spacing between adjacent edge scrapers is 200 mm. The edge scrapers are located at the periphery of the shield cutterhead and used to remove muck from the periphery, preventing clogging.

[0039] The thirty-six cutting knives are configured, each with a height of 135-295 mm, and a spacing between adjacent cutting knives is 200 mm. The cutting knives segment the muck into blocks and assist in cutting I-beams and reinforcement bars.

[0040] Compared to the prior art, the present disclosure has the following beneficial effects.

[0041] 1. Through the composite multi-tiered conical cutterhead design and the rational configuration of various tools such as roller cutters and ripper blades in graded heights, the shield machine can break through underground diaphragm walls and cut I-beams and reinforcing bars. This ensures the feasibility of shield tunneling beneath existing stations with diaphragm walls with steel I-beams, significantly reducing construction cycles and costs.

[0042] 2. The multi-tiered conical cutterhead design achieves stepwise cutting of reinforced concrete and I-beams from the center outward. Uncut sections are rolled and curled toward the edge of the cutterhead body under the action of the roller cutters and eventually discharged outside the tunnel, effectively preventing large steel plates from obstructing excavation. This approach solves the problem that while shield tunneling through the diaphragm walls with steel I-beams, the rear I-beam flange plates cannot be cut properly due to insufficient support, and large I-beam sections jam the cutterhead.

[0043] 3. The tool arrangement of the conical cutterhead provides extremely high cutting performance, durability, and reliability of the cutters. It not only effectively addresses the lack of endurance in ripper cutters but also resolves the problem of ineffective segmentation and cutting of large sections fallen from the bottom flange of I-beams, thereby realizing continuous cutting through multiple diaphragm walls without tool replacement.

[0044] 4. The conical cutterhead configuration combines roller cutters, modified ripper blades, scrapers, and cutting knives, thereby ensuring the cutting length of I-beam plates and reinforcing bars within a preset range, while extensively using rippers to replace roller cutters, thereby reducing the overall weight of the cutterhead. The design also maintains the ability to excavate in soft soil and directly cut through concrete diaphragm walls with steel I-beams. The design is also capable of traversing composite ground conditions and reduces the risk that the shield machine falls head down during tunneling through soft soil areas.BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG. 1 is a structural diagram of a shield cutterhead for cutting a diaphragm wall with steel I-beam according to one embodiment of the present disclosure;

[0046] FIG. 2 is a side view of a cutterhead body according to one embodiment of the present disclosure;

[0047] FIG. 3 is a tool trajectory diagram of a tool group according to one embodiment of the present disclosure, illustrating a spatial positioning of various tools; and

[0048] FIG. 4 schematically shows a structure of a wear-resistant protection device for the shield cutterhead according to one embodiment of the present disclosure.DETAILED DESCRIPTION OF EMBODIMENTS

[0049] The present disclosure will be further described in detail below in conjunction with accompanying drawings and embodiments. It should be understood that the embodiments described herein are intended to illustrate and explain the present disclosure and not intended to limit the present disclosure.

[0050] As used herein, it should be noted that the orientation or positional relationships indicated by terms such as “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, and “circumferential” are based on the orientation or positional relationships shown in the drawings. These terms are used only for the convenience of describing and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed or operated in a specific orientation. Therefore, these terms should not be understood as a limitation of the present disclosure.

[0051] Furthermore, the terms “first” and “second” are merely descriptive and cannot be understood as indicating or implying relative importance or as implying the number of technical features indicated. Thus, features defined by “first” or “second” may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the term “multiple” means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0052] As used herein, unless otherwise expressly specified and defined, the terms, such as “mount”, “connect”, “couple”, and “fix” should be understood in a broad sense, for example, it may be fixed connection, detachable connection, or integral connection; it may be mechanical connection, electrical connection, or mutual communication; it may be direct connection or indirect connection through an intermediate medium; and it may be internal communication or interactive relationship between two members. For those skilled in the art, the specific meanings of the above terms can be understood according to specific situations.

[0053] As used herein, unless otherwise expressly specified and defined, the description of a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact, or in indirect contact through an intermediate medium. Moreover, the description of the first feature being “on”, “above”, or “over” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply denote that the first feature is at a higher horizontal level than the second feature. The description of the first feature being “under”, “below”, or “beneath” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply denote that the first feature is at a lower horizontal level than the second feature.

[0054] As used herein, the terms “one embodiment”, “some embodiments”, “example”, “specific example”, or “some examples” indicate that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present disclosure. In the disclosure, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art may combine and integrate the different embodiments or examples described herein, as well as the features of different embodiments or examples.

[0055] The present disclosure will be described in detail with reference to the accompanying drawings and embodiments.

[0056] Referring to FIGS. 1 and 2, a shield cutterhead for cutting a diaphragm wall with steel I-beam includes a circular cutterhead body 1. A central double-disc roller cutter 4 is disposed at a center of a working face of the cutterhead body 1. The central double-disc roller cutter 4 is connected to a plurality of main cutter beams 2, which are arranged radially along the cutterhead body 1. The auxiliary cutter beams 3 are positioned between adjacent main cutter beams 2.

[0057] Referring to FIGS. 1 and 3, the tool group is mounted on the plurality of main cutter beams 2 and the auxiliary cutter beams 3. Based on heights of the central double-disc roller cutter 4 and the tool group, the central double-disc roller cutter 4, the main cutter beams 2, and the auxiliary cutter beams 3 are divided in six tiers from the center to the periphery of the cutterhead body 1. The six tiers include a first tier, a second tier, a third tier, a fourth tier, a fifth tier, and a sixth tier, with heights decreasing sequentially. The central double-disc roller cutter 4 constitutes the first tier.

[0058] The tool group includes a single disc cutter 5, a replaceable ripper 6, a welded ripper 7, an edge scraper 8, and a cutting knife 9.

[0059] A plurality of foam nozzles 11 are arranged on the working face of the cutterhead body 1.

[0060] In an embodiment, the plurality of main cutter beams 2 include a first cutter beam 21, a second cutter beam 22, a third cutter beam 23, and a fourth cutter beam 24 arranged clockwise on the working face of the cutterhead body 1.

[0061] The auxiliary cutter beam 3 includes a fifth cutter beam 31, a sixth cutter beam 32, a seventh cutter beam 33, and an eighth cutter beam 34. The fifth cutter beam 31 is disposed between the first cutter beam 21 and the second cutter beam 22. The sixth cutter beam 32 is disposed between the second cutter beam 22 and the third cutter beam 23. The seventh cutter beam 33 is disposed between the third cutter beam 23 and the fourth cutter beam 24. The eighth cutter beam 34 is disposed between the fourth cutter beam 24 and the first cutter beam 21.

[0062] In an embodiment, the end of each main cutter beam 2 closer to the center of the cutterhead body 1 is defined as the inner end, and the opposite end is defined as the outer end. The arrangement of the tool group mounted on each main cutter beam 2 from the inner end to the outer end is as follows.

[0063] The second tier of the first cutter beam 21 is equipped with one single disc cutter 5, with one cutting knife 9 on each side respectively. The third tier of the first cutter beam 21 is equipped with one single disc cutter 5, with one cutting knife 9 on each side respectively. The fourth tier of the first cutter beam 21 is equipped with one single disc cutter 5, with one cutting knife 9 on each side respectively. The fifth tier of the first cutter beam 21 is equipped with one replaceable ripper 6 and one welded ripper 7. The sixth tier of the first cutter beam 21 is equipped with three single disc cutters 5 and two welded rippers 7.

[0064] The second tier of the second cutter beam 22 is equipped with one replaceable ripper 6. The third tier of the second cutter beam 22 is equipped with one replaceable ripper 6, with one cutting knife 9 on each side respectively. The fourth tier of the second cutter beam 22 is equipped with one single disc cutter 5, one replaceable ripper 6, and one welded ripper 7, with one cutting knife 9 on each side respectively. The fifth tier of the second cutter beam 22 is equipped with one single disc cutter 5. The sixth tier of the second cutter beam 2 is equipped with two single disc cutters 5 and one welded ripper 7.

[0065] The second tier of the third cutter beam 23 is equipped with one cutting knife 9 on each side respectively. The third tier of the third cutter beam 23 is equipped with one single disc cutter 5, one replaceable ripper 6, and one welded ripper 7, with one cutting knife 9 on each side respectively. The fourth tier of the third cutter beam 23 is equipped with one single disc cutter 5, with one cutting knife 9 on each side respectively. The fifth tier of the third cutter beam 23 is equipped with one single disc cutter 5. The sixth tier of the third cutter beam 23 is equipped with two single disc cutters 5.

[0066] The second tier of the fourth cutter beam 24 is equipped with one single disc cutter 5. The third tier of the fourth cutter beam 24 is equipped with one single disc cutter 5, with one cutting knife 9 on each side respectively. The fourth tier of the fourth cutter beam 24 is equipped with one replaceable ripper 6 and one welded ripper 7, with one cutting knife 9 on each side respectively. The fifth tier of the fourth cutter beam 24 is equipped with one single disc cutter 5, one replaceable ripper 6, and one welded ripper 7. The sixth tier of the fourth cutter beam 24 is equipped with two single disc cutters 5 and two welded rippers 7.

[0067] In an embodiment, the arrangement of the tool group mounted on each auxiliary cutter beam 3 from the inner end to the outer end is as follows.

[0068] The third tier of the fifth cutter beam 31 is equipped with one welded ripper 7. The fourth tier of the fifth cutter beam 31 is equipped with one welded ripper 7, with one cutting knife 9 on each side respectively. The fifth tier of the fifth cutter beam 31 is equipped with one welded ripper 7, with one cutting knife 9 on each side respectively. The sixth tier of the fifth cutter beam 31 is equipped with one single disc cutter 5, with one edge scraper 8 on each side respectively.

[0069] The fourth tier of the sixth cutter beam 32 is equipped with one welded ripper 7. The fifth tier of the sixth cutter beam 32 is equipped with two welded rippers 7, with one cutting knife 9 on each side respectively. The sixth tier of the sixth cutter beam 32 is equipped with one single disc cutter 5, with one cutting knife 9 and one edge scraper 8 on each side respectively.

[0070] The fourth tier of the seventh cutter beam 33 is equipped with one welded ripper 7, with one cutting knife 9 on each side respectively. The fifth tier of the seventh cutter beam 33 is equipped with one cutting knife 9 on each side respectively. The sixth tier of the seventh cutter beam 33 is equipped with one single disc cutter 5 and two welded rippers 7, with one edge scraper 8 on each side respectively.

[0071] The third tier of the eighth cutter beam 34 is equipped with one welded ripper 7. The fourth tier of the eighth cutter beam 34 is equipped with one welded ripper 7. The fifth tier of the eighth cutter beam 34 is equipped with one welded ripper 7, with one cutting knife 9 on each side respectively. The sixth tier of the eighth cutter beam 34 is equipped with one single disc cutter 5, with one cutting knife 9 and one edge scraper 8 on each side respectively.

[0072] In an embodiment, the periphery of the cutterhead body 1 is equipped with a wear-resistant protection device 10. As shown in FIG. 4, the wear-resistant protection device 10 includes a wear-resistant alloy block 101 and a wear-resistant steel plate 102 alternately arranged along the periphery of the cutterhead body 1. By alternately arranging the wear-resistant alloy block 101 and the wear-resistant steel plate 102, the wear of the cutterhead is reduced.

[0073] In an embodiment, the radial width of each tier in the six tiers is 500 mm.

[0074] In an embodiment, the central double-disc roller cutter 4 includes four parallel cutting tools with a height of 368-388 mm, and the spacing between adjacent parallel cutting tools is 90 mm. Such central double-disc roller cutter exhibits high cutting capacity, durability, and reliability. During shield tunneling, the central double-disc roller cutter can first cut off the bottom flange plate of the steel I-beam from the center while simultaneously avoiding the issue where tools that initially engage with soil are prone to damage and lack endurance.

[0075] In an embodiment, the number of the foam nozzles 11 is six, and each foam nozzle 11 is independently connected to a single pump via a dedicated pipeline.

[0076] Twenty-five single disc cutters are configured, each with a tool height of 188-348 mm, and the spacing between adjacent single disc cutters is 100 mm. The single disc cutter can cut through I-beam steel plates and reinforcement bars, while driving uncut I-beam steel plates and uncut reinforcement bars toward the outside of the tunnel, effectively preventing large steel plates from obstructing the tunneling process. The single disc cutters are arranged in a layered layout, which helps reduce the length of the cut I-beam steel and reinforcement bars.

[0077] The seven replaceable rippers are configured, each with a tool height of 188-308 mm, and the spacing between adjacent replaceable rippers is 100 mm. The replaceable rippers can cut I-beam steel plates and reinforcement bars, and can be easily replaced when worn.

[0078] The twenty-three welded rippers are configured, each with a tool height of 148-308 mm, and a spacing between adjacent welded rippers 200-300 mm. The welded rippers are more robust and exhibit enhanced capability in cutting I-beams and reinforcement bars.

[0079] The eight edge scrapers are configured, each with a tool height of 135 mm, and a spacing between adjacent edge scrapers is 200 mm. The edge scrapers are located at the periphery of the shield cutterhead and used to remove muck from the periphery, preventing clogging.

[0080] The thirty-six cutting knives are configured, each with a tool height of 135-295 mm, and a spacing between adjacent cutting knives is 200 mm. The cutting knives segment the muck into blocks and assist in cutting I-beams and reinforcement bars.

[0081] FIG. 3 is a tool trajectory diagram of the tool group illustrating a spatial positioning relationship among various tools. The tools are divided into six tiers based on their respective blade heights. The left portion of FIG. 3 shows the cutting trajectories of the central double-disc roller cutter 4, the single disc cutter 5, and the replaceable ripper 6. The middle portion of FIG. 3 shows the cutting trajectory of the welded ripper 7. The right portion of FIG. 3 shows the cutting trajectories of the edge scraper 8 and the cutting knife 9. Additionally, in this embodiment, the shield excavation diameter of the shield cutterhead is 6460 mm.

[0082] Described above are merely preferred embodiments of the disclosure, which are not intended to limit the disclosure. It should be understood that any modifications and replacements made by those skilled in the art without departing from the spirit of the disclosure should fall within the scope of the disclosure defined by the appended claims.

Claims

1. A shield cutterhead for cutting a diaphragm wall with a steel I-beam, comprising:a cutterhead body;a plurality of main cutter beams;an auxiliary cutter beam;a central double-disc roller cutter; anda tool group;wherein the cutterhead body is circular; the central double-disc roller cutter is arranged at a center of a working face of the cutterhead body; the central double-disc roller cutter is connected to the plurality of main cutter beams; the plurality of main cutter beams are arranged radially along the cutterhead body; and the auxiliary cutter beam is arranged between adjacent main cutter beams;the tool group is mounted on the plurality of main cutter beams and the auxiliary cutter beam; the central double-disc roller cutter, the plurality of main cutter beams, and the auxiliary cutter beam are divided in six tiers from a center of the cutterhead body to an edge of the cutterhead body based on heights of the central double-disc roller cutter and the tool group; the six tiers comprise a first tier, a second tier, a third tier, a fourth tier, a fifth tier, and a sixth tier, with height decreasing progressively; and the central double-disc roller cutter is the first tier;the tool group comprises a single disc cutter, a replaceable ripper, a welded ripper, an edge scraper, and a cutting knife; anda plurality of foam nozzles are arranged on the working face of the cutterhead body.

2. The shield cutterhead of claim 1, wherein the plurality of main cutter beams comprise a first cutter beam, a second cutter beam, a third cutter beam, and a fourth cutter beam arranged clockwise on the working face of the cutterhead body; andthe auxiliary cutter beam comprises a fifth cutter beam, a sixth cutter beam, a seventh cutter beam, and an eighth cutter beam; the fifth cutter beam is arranged between the first cutter beam and the second cutter beam; the sixth cutter beam is arranged between the second cutter beam and the third cutter beam; the seventh cutter beam is arranged between the third cutter beam and the fourth cutter beam; and the eighth cutter beam is arranged between the fourth cutter beam and the first cutter beam.

3. The shield cutterhead of claim 2, wherein an end of each main cutter beam close to the center of the cutterhead body is an inner end, and an other end of each main cutter beam is an outer end; andthe tool group on each main cutter beam is arranged from the inner end to the outer end as follows:a second tier of the first cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a third tier of the first cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fourth tier of the first cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fifth tier of the first cutter beam is equipped with one replaceable ripper and one welded ripper; a sixth tier of the first cutter beam is equipped with three single disc cutters and two welded rippers;a second tier of the second cutter beam is equipped with one replaceable ripper; a third tier of the second cutter beam is equipped with one replaceable ripper, with one cutting knife on each side respectively; a fourth tier of the second cutter beam is equipped with one single disc cutter, one replaceable ripper, and one welded ripper, with one cutting knife on each side respectively; a fifth tier of the second cutter beam is equipped with one single disc cutter; a sixth tier of the second cutter beam is equipped with two single disc cutters and one welded ripper;a second tier of the third cutter beam is equipped with one cutting knife on each side respectively; a third tier of the third cutter beam is equipped with one single disc cutter, one replaceable ripper, and one welded ripper, with one cutting knife positioned on each side respectively; a fourth tier of the third cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fifth tier of the third cutter beam is equipped with one single disc cutter; and a sixth tier of the third cutter beam is equipped with two single disc cutters; anda second tier of the fourth cutter beam is equipped with one single disc cutter; a third tier of the fourth cutter beam is equipped with one single disc cutter, with one cutting knife on each side respectively; a fourth tier of the fourth cutter beam is equipped with one replaceable ripper and one welded ripper, with one cutting knife on each side respectively; a fifth tier of the fourth cutter beam is equipped with one single disc cutter, one replaceable ripper, and one welded ripper; and a sixth tier of the fourth cutter beam is equipped with two single disc cutters and two welded rippers.

4. The shield cutterhead of claim 2, wherein an end of each auxiliary cutter beam close to the center of the cutterhead body is an inner end, and an other end of each auxiliary cutter beam is an outer end; andthe tool group on each auxiliary cutter beam is arranged from the inner end to the outer end as follows:a third tier of the fifth cutter beam is equipped with one welded ripper; a fourth tier of the fifth cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; a fifth tier of the fifth cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; and a sixth tier of the fifth cutter beam is equipped with one single disc cutter, with one edge scraper on each side respectively;a fourth tier of the sixth cutter beam is equipped with one welded ripper; a fifth tier of the sixth cutter beam is equipped with two welded rippers, with one cutting knife on each side respectively; a sixth tier of the sixth cutter beam is equipped with one single disc cutter, with one cutting knife and one edge scraper on each side respectively;a fourth tier of the seventh cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; a fifth tier of the seventh cutter beam is equipped with one cutting knife on each side respectively; and a sixth tier of the seventh cutter beam is equipped with one single disc cutter and two welded rippers, with one edge scraper on each side respectively; anda third tier of the eighth cutter beam is equipped with one welded ripper; a fourth tier of the eighth cutter beam is equipped with one welded ripper; a fifth tier of the eighth cutter beam is equipped with one welded ripper, with one cutting knife on each side respectively; and a sixth tier of the eighth cutter beam is equipped with one single disc cutter, with one cutting knife and one edge scraper on each side respectively.

5. The shield cutterhead of claim 1, wherein a periphery of the cutterhead body is provided with a wear-resistant protection device; and the wear-resistant protection device comprises a wear-resistant alloy block and a wear-resistant steel plate alternately arranged along the periphery of the cutterhead body.

6. The shield cutterhead of claim 1, wherein a radial width of each tier within the six tiers is 500 mm.

7. The shield cutterhead of claim 1, wherein the central double-disc roller cutter comprises four parallel cutting tools, each with a height of 368-388 mm; and a spacing between adjacent parallel cutting tools is 90 mm.

8. The shield cutterhead of claim 1, wherein the number of the plurality of foam nozzles is six; and each foam nozzle is independently connected to a single pump via a dedicated pipeline.

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