A shield machine tearing cutter for cutting a joint of strip steel underground continuous wall

Abstract

The application relates to a shield machine tearing cutter for cutting strip steel joint underground continuous walls and relates to the field of shield machine cutters. The cutter comprises a cutter head main cutting alloy, a cutter head secondary cutting alloy, a cutter body, a cutter shaft, a retaining ring and a cutter seat; the cutter head main cutting alloy is brazed and embedded on the cutter body, the cutter head secondary cutting alloy is provided with two and is respectively brazed and embedded on two sides of the cutter body; the bottom end of the cutter body is connected to the cutter shaft, the cutter shaft passes through the shaft hole of the cutter seat, and the retaining ring is welded at the two ends outside the cutter seat. The application has the advantages of high reliability, strong impact resistance, good wear resistance and durability, can efficiently cut strip steel joint underground continuous walls, reduces the frequency of replacing the cutter of the shield machine, saves construction cost, improves the tunneling efficiency of the shield machine and has wide application prospect and remarkable economic benefits.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) cutting tools, specifically a TBM tearing tool for cutting underground continuous walls with steel joints. Background Technology

[0002] During tunnel boring machine (TBM) construction, situations often arise where it is necessary to cut through diaphragm walls with steel joints, such as when the TBM passes through the diaphragm walls of existing railway station retaining structures or underground obstacles beneath the foundations of old buildings. Existing TBM cutters often suffer from low cutting efficiency, rapid cutter wear, and easy breakage of the cutter head alloy when facing diaphragm walls with steel joints. They are also unable to effectively cut through reinforcing bars and tear steel plates. The cutter edge design is ineffective in cutting these obstacles, resulting in excessively long reinforcing bars and steel plates, which hinders auger output and poses a risk of jamming the auger. This necessitates opening the chamber to replace the cutter and handling the reinforcing bars and steel plates, hindering construction progress and increasing construction risks and costs. This seriously affects construction safety and schedule. Therefore, a specialized TBM tearing cutter for cutting reinforcing bars and steel plates is needed to improve the tunneling efficiency of TBMs under complex working conditions. Summary of the Invention

[0003] The purpose of this invention is to design a tunnel boring machine tearing cutter for cutting diaphragm walls with steel joints. It has high reliability, strong impact resistance, and good wear resistance and durability. It can efficiently cut diaphragm walls with steel joints, reduce the frequency of cutter replacement for tunnel boring machines, save construction costs, and improve the tunneling efficiency of tunnel boring machines. It has broad application prospects and significant economic benefits.

[0004] To achieve the above objectives, the present invention provides a tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints, comprising: a main cutting alloy for the cutter head, a secondary cutting alloy for the cutter head, a cutter body, a cutter shaft, retaining rings, and a cutter holder; the main cutting alloy for the cutter head is brazed and embedded in the cutter body, and two secondary cutting alloys for the cutter head are provided, which are respectively brazed and embedded on both sides of the cutter body; the bottom end of the cutter body is connected to the cutter shaft, the cutter shaft passes through the axial through hole on the cutter holder, and retaining rings are welded at both ends on the outer side of the cutter holder.

[0005] Furthermore, the upper part of the blade body is provided with a laser-clad wear-resistant layer.

[0006] Furthermore, the tool holder is secured by a triangular block and fixed by an adjusting bolt.

[0007] Furthermore, the main cutting alloy of the cutter head is 40-50mm thick, the cutting edge is 5mm wide, and it is made of tungsten and cobalt alloy by sintering, with a cobalt content of 14%-16%; the total height of the main cutting alloy of the cutter head is 50mm, the exposed height of the main cutting alloy of the cutter head is 35mm, and the cutting edge angle is 80-85°.

[0008] Furthermore, the total height of the secondary cutting alloy of the cutter head is 45mm, the exposed height of the secondary cutting alloy of the cutter head is 30mm, the cutting edge angle is 80~85°, and the left and right tilt angle of the secondary cutting alloy of the cutter head is less than 135°.

[0009] Furthermore, the cutter body is made of high-strength alloy steel, and the head of the cutter body has three socket grooves machined at the bottom according to the main cutting alloy and the secondary cutting alloy of the cutter head. The socket grooves are 20mm deep, and the lower bevel of the cutter body is welded to the cutter holder.

[0010] Furthermore, the cutter shaft is made of 42CrMo and hardened by quenching, with a hardness of HRC38+1.

[0011] The beneficial effects of this invention are as follows: This invention solves the problems of ordinary tearing tools being unsustainable when cutting diaphragm walls with steel joints, and the easy chipping and breakage of the tool tip alloy. This invention is a high-performance specialized tool designed for direct cutting of diaphragm walls with steel joints by tunnel boring machines. The tool tip cutting alloy consists of a main cutting alloy and a secondary cutting alloy, which are used sequentially to cut the diaphragm wall with steel joints. The lower parts of the main and secondary cutting alloys are brazed into a receiving groove on the upper part of the tool body. The receiving groove provides reinforcement and support around the cutting alloy, increasing the brazing contact area and effectively preventing alloy chipping. The tool provides a cobalt content in the alloy, improving its toughness, enhancing its impact resistance, and reducing the risk of alloy chipping and wear. The cutting capability and durability of this tearing tool are superior to other tearing tools. Attached Figure Description

[0012] Figure 1 This is a front view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a top view of the present invention.

[0013] In the diagram: 1-Main cutting alloy of the tool head, 2-Secondary cutting alloy of the tool head, 3-Tool body, 4-Laser cladding wear-resistant layer, 5-Tool shaft, 6-Stabilizing ring, 7-Tool holder, 8-Triangular anti-tilting block, 9-Adjusting bolt. Detailed Implementation

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0015] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0016] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0017] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0018] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0019] See Figures 1 to 3 This embodiment discloses a tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints, comprising: a main cutting alloy 1, a secondary cutting alloy 2, a cutter body 3, a cutter shaft 5, a retaining ring 6, and a cutter holder 7; the main cutting alloy 1 is brazed and embedded in the cutter body 3, and two secondary cutting alloys 2 are provided, respectively brazed and embedded on both sides of the cutter body 3; the bottom end of the cutter body 3 is connected to the cutter shaft 5, the cutter shaft 5 passes through the axial through hole on the cutter holder 7, and retaining rings 6 are welded at both ends on the outer side of the cutter holder 7 to prevent the cutter holder 7 from moving left and right on the cutter shaft 5.

[0020] To further optimize the technical solution, a laser-clad wear-resistant layer 4 is provided on the upper part of the blade body 3 to enhance the wear resistance of the blade body.

[0021] The technical solution is further optimized by fastening the tool holder 7 with a triangular block 8 and fixing it with an adjusting bolt 9, which is used to adjust and fix the tool holder 7 and prevent the tool body 3 from rotating or tilting.

[0022] To further optimize the technical solution, the main cutting alloy 1 of the cutter head is 40-50mm thick and has a cutting edge width of 5mm. It is made of tungsten and cobalt alloy sintering with a cobalt content of 14%-16%. The total height of the main cutting alloy 1 of the cutter head is 50mm, and the exposed height of the main cutting alloy 1 of the cutter head is 35mm. The cutting edge angle is 80-85°, which can improve the cutting ability of the alloy head to cut steel bars and structural steel plates. The height of 35mm is 5mm higher than that of the secondary cutting alloy, which prevents steel bars and structural steel plates from scraping off the secondary alloy head.

[0023] Further optimization of the technical solution involves a total height of 45mm for the secondary cutting alloy 2 of the cutter head, an exposed height of 30mm for the secondary cutting alloy 2 of the cutter head, a cutting edge angle of 80~85°, and a left-right tilt angle of less than 135° for the secondary cutting alloy 2 of the cutter head, which can improve the cutting ability of the alloy head in cutting reinforcing bars and structural steel plates.

[0024] To further optimize the technical solution, the cutter body 3 is manufactured using high-strength alloy steel. Three receiving grooves are machined at the bottom of the cutter body 3 according to the main cutting alloy 1 and the secondary cutting alloy 2 of the cutter head. The depth of the receiving grooves is 20mm. The lower bevel of the cutter body 3 is welded to the tool holder 7. The 20mm depth of the receiving grooves improves alloy stability and prevents alloy from falling off due to excessive temperature or stress during cutting.

[0025] The technical solution has been further optimized. The cutter shaft 5 is made of 42CrMo and hardened by quenching, with a hardness of HRC38+1.

[0026] This invention solves the problems of ordinary tearing tools being unsustainable when cutting diaphragm walls with steel joints, and the easy chipping and breakage of the tool tip alloy. This invention is a high-performance specialized tool designed for direct cutting of diaphragm walls with steel joints by tunnel boring machines. The tool tip cutting alloy consists of a main cutting alloy and a secondary cutting alloy, which are used sequentially to cut the diaphragm wall with steel joints. The lower parts of the main and secondary cutting alloys are brazed into a receiving groove on the upper part of the tool body. The receiving groove provides reinforcement and support around the cutting alloy, increasing the brazing contact area and effectively preventing alloy chipping. The tool provides a cobalt content in the alloy, improving its toughness, enhancing its impact resistance, and reducing the risk of alloy chipping and wear. The cutting capability and durability of this tearing tool are superior to other tearing tools.

[0027] The present invention provides a tunnel boring machine (TBM) tearing cutter that is securely mounted on the corresponding position of the TBM cutterhead via a cutter shaft mounting structure, ensuring correct and stable cutter installation angle. When the TBM encounters a diaphragm wall with steel section joints during its advancement, as the cutterhead rotates, the main cutting alloy edge in the center of the cutter head first contacts and cuts the concrete, allowing the cutter to smoothly slide and cut within the concrete. As the advancement displacement increases, the main cutting alloy edge gradually penetrates and grinds the reinforcing steel and structural steel, while the secondary cutting alloy edge subsequently joins in cutting the diaphragm wall with steel section joints, until the steel section plates are completely severed.

[0028] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints, characterized in that, include: The tool head has a main cutting alloy (1), a secondary cutting alloy (2), a tool body (3), a tool shaft (5), a retaining ring (6), and a tool holder (7). The main cutting alloy (1) is brazed and embedded on the tool body (3). There are two secondary cutting alloys (2), which are brazed and embedded on both sides of the tool body (3). The bottom end of the tool body (3) is connected to the tool shaft (5). The tool shaft (5) passes through the axial through hole on the tool holder (7), and retaining rings (6) are welded at both ends of the tool holder (7).

2. The shield machine tearing cutter for cutting diaphragm walls with steel section joints as described in claim 1, characterized in that, The upper part of the blade body (3) is provided with a laser cladding wear-resistant layer (4).

3. A tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints as described in claim 2, characterized in that, The tool holder (7) is fastened by a triangular block (8) and fixed by an adjusting bolt (9).

4. A tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints as described in claim 1 or 3, characterized in that, The main cutting alloy (1) of the cutter head is 40~50mm thick and 5mm wide. It is made of tungsten and cobalt alloy sintering and has a cobalt content of 14%~16%. The total height of the main cutting alloy (1) of the cutter head is 50mm, the exposed height of the main cutting alloy (1) of the cutter head is 35mm, and the included angle of the cutting edge is 80~85°.

5. A tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints as described in claim 4, characterized in that, The total height of the secondary cutting alloy (2) of the cutter head is 45mm, the exposed height of the secondary cutting alloy (2) of the cutter head is 30mm, the cutting edge angle is 80~85°, and the left and right tilt angle of the secondary cutting alloy (2) of the cutter head is less than 135°.

6. A tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints as described in claim 1 or 5, characterized in that, The cutter body (3) is made of high-strength alloy steel. The head of the cutter body (3) is machined with three socket grooves at the bottom according to the main cutting alloy (1) and the secondary cutting alloy (2) of the cutter head. The socket grooves are 20mm deep. The lower bevel of the cutter body (3) is welded to the cutter holder (7).

7. A tunnel boring machine tearing cutter for cutting diaphragm walls with steel section joints as described in claim 1, characterized in that, The cutter shaft (5) is made of 42CrMo and hardened by quenching, with a hardness of HRC38+1.

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