Concrete cutting tool for shield tunneling machine

Abstract

The utility model belongs to the field of shield tunneling machine application tools, and particularly relates to a plurality of concrete cutting tools for a shield tunneling machine, which are fixedly arranged on a cutterhead of the shield tunneling machine, are arranged in a staggered manner along the radial direction of the cutterhead, and comprise tool aprons and tool bits, the mounting part comprises a mounting block fixedly arranged at the upper end of the tool apron and two stop blocks, the two stop blocks are located at the two ends of the mounting block, and the upper portions of the stop blocks are higher than the mounting block; a plurality of tool bits are fixedly arranged on the mounting block, each tool bit is arranged between the two stop blocks, flanges are fixedly arranged at the two ends of each tool bit, and the upper sides of the flanges are lower than the upper sides of the alloys on the tool bits. According to the utility model, the stop block is arranged to support the bearing load of the tool bit, the tool bit alloy is limited through the flange, the cutting life of the tool bit in the construction process is effectively prolonged, the cutting effect is improved, and the concrete pile foundation crushing efficiency and the durability of the tool are improved by adding the tool bit.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel boring machine application tools, specifically relating to a concrete cutting tool for tunnel boring machines. Background Technology

[0002] During the construction of tunnel boring machines (TBMs), it is inevitable to pass through concrete pile foundations. When TBM cutters pass through concrete pile foundations, they have the following limitations: the cutters need to repeatedly crush the reinforcing bars, resulting in low cutting efficiency; the reinforcing bars cannot be completely cut off, resulting in bar entanglement or impact, which causes the cutter ring to break, causing bearing damage. In severe cases, it can cause batch failure of the cutters, resulting in the TBM to stop and seriously affecting the construction progress.

[0003] Currently, when dealing with concrete pile foundations, methods such as manual chiseling and static blasting are often used, which have the problem of low construction efficiency and have a certain impact on the building above the reinforced concrete pile foundation, resulting in significant safety risks during construction. Summary of the Invention

[0004] This invention addresses the problems encountered during tunnel boring machine (TBM) construction when passing through concrete pile foundations. Existing methods such as manual chiseling are inefficient, have significant environmental impact, and pose high safety risks. Direct TBM penetration through concrete pile foundations requires repeated crushing of reinforcing bars by the cutter head, resulting in low cutting efficiency. Incomplete cutting of the reinforcing bars leads to entanglement or impact, causing blade breakage, bearing damage, and in severe cases, mass cutter head failure, resulting in TBM downtime and significantly impacting construction progress. The invention provides a concrete cutting tool for TBMs that uses a stop block to support the load on the cutter head and a retaining edge to limit the cutting edge alloy, effectively improving the cutting life and cutting effect during construction. By increasing the number of cutter heads, the efficiency of breaking concrete pile foundations is improved, and the tool's durability is enhanced.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A concrete cutting tool for a tunnel boring machine (TBM) is fixedly mounted on the cutterhead of the TBM, and multiple cutting tools are arranged radially offset along the cutterhead. Each tool includes a tool holder and a cutting head. The tool holder has a mounting portion, which includes a mounting block fixedly mounted on the upper end of the tool holder and two stops. The two stops are located at opposite ends of the mounting block, with the upper parts of each stop higher than the mounting block. Multiple cutting heads are fixedly mounted on the mounting block, with each cutting head positioned between two stops. Each cutting head has a retaining edge fixedly mounted at both ends, with the upper side of the retaining edge lower than the upper side of the alloy coating on the cutting head. The two stops support the cutting head when it is subjected to a forward / backward load, and the retaining edges limit the alloy coating on the cutting head to prevent it from falling off.

[0007] Preferably, the cutting head is a shell cutter, and the cutting angle α of the cutting head is 50-60°, which effectively ensures the penetration performance of the cutting head and ensures cutting efficiency.

[0008] Preferably, the cutter head is fixedly connected to the mounting block by bolts, which facilitates the disassembly and replacement of the cutter head as needed, thereby extending the service life of the cutter holder.

[0009] Preferably, a limiting piece is provided on one side of the cutter head, and the limiting piece is fixedly connected to multiple bolts. The limiting piece fixes the bolts to prevent the bolts from loosening and causing damage to the cutter.

[0010] Preferably, the bolt end is welded to the limiting piece, and the bolt and the limiting piece are fixedly connected by spot welding.

[0011] Preferably, the lower part of the cutter head is provided with a through groove that matches the outer side of the mounting block. A first through hole is provided on both opposite sides of the through groove. Multiple second through holes are provided on the two mounting blocks. The two first through holes on the same cutter head correspond to one of the second through holes. The bolt passes through the corresponding first through hole and second through hole. After the bolt passes through the corresponding through hole, it is locked and fixed by a nut.

[0012] Preferably, the spacing between the cutting trajectories of any two adjacent cutter heads is the same, which increases the cutter head density, improves crushing efficiency and overall tool durability.

[0013] Preferably, two cutting heads are provided between the two stops.

[0014] The beneficial effects of this utility model through the above technical solution are as follows:

[0015] 1. When a tunnel boring machine (TBM) passes through a concrete pile foundation, the wear of the cutter head is greater than that of the cutter holder. Compared with the existing integrated design of the cutter head and cutter holder, this utility model connects the cutter head to the mounting part on the cutter holder with bolts. The cutter head can be disassembled and replaced as needed, extending the replacement cycle of the cutter holder, thereby extending the service life of the cutter and reducing construction costs.

[0016] 2. This utility model increases the cutting angle of the shell-shaped tearing knife to 50-60°, which makes it easier for the knife head to penetrate the concrete pile foundation and improves the cutting efficiency compared to the existing 40° cutting angle tearing knife.

[0017] 3. This utility model effectively shortens the spacing between the cutting trajectories of the cutter heads by setting multiple cutter heads on the cutter holder, which significantly improves the efficiency of crushing concrete pile foundations. Due to the increase in the number of cutter heads, the load-bearing capacity of the tool is increased, and the overall durability of the tool is improved.

[0018] 4. This utility model forms retaining edges at both ends of the shell-shaped cutter head by thickening the base material, which improves the bonding strength between the alloy and the base material and improves the problem of alloy peeling off and falling off on both sides when the tunnel boring machine rotates forward and backward. At the same time, the height of the retaining edge is lower than the height of the cutter head to avoid affecting the penetration of the cutter.

[0019] 5. This utility model has a mounting block on the top of the tool holder for mounting the tool head. The front and rear stops are higher than the mounting block. Its advantage is that when the tool head is subjected to loads from the front and rear directions, the stops can support the tool head and prevent the tool head from shifting or flipping.

[0020] 6. This utility model fixes the bolt by spot welding a metal sheet to the surface of the bolt head, preventing the bolt from loosening due to vibration generated during the cutting process, which would then damage the cutting tool and affect the tunneling construction. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the tool holder of this utility model. Figure 1 .

[0023] Figure 3 This is a schematic diagram of the structure of the tool holder of this utility model. Figure 2 .

[0024] Figure 4 This is a schematic diagram of the structure of the cutter head of this utility model. Figure 1 .

[0025] Figure 5 This is a schematic diagram of the structure of the cutter head of this utility model. Figure 2 .

[0026] Figure 6 This is a schematic diagram of the structure of the cutter head of this utility model. Figure 3 .

[0027] Figure 7 This is a schematic diagram of the structure of the cutter head of this utility model. Figure 4 .

[0028] Figure 8 This is a schematic diagram of the concrete cutting tool of this utility model mounted on the cutter head.

[0029] Figure 9 This is a schematic diagram of an existing tool mounted on a tool turret.

[0030] The numbers in the attached diagram are as follows: 1 is the cutter head, 2 is the cutter holder, 3 is the cutter head, 4 is the mounting block, 5 is the stop block, 6 is the side guard, 7 is the through groove, 8 is the first through hole, 9 is the second through hole, and 10 is the limiting piece. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0032] like Figures 1 to 8 As shown, this embodiment provides a concrete cutting tool for a tunnel boring machine (TBM). Multiple tools are fixedly mounted on the cutterhead 1 of the TBM, with the tools arranged radially offset along the cutterhead 1. Each tool includes a tool holder 2 and cutter heads 3. The tool holder 2 has a mounting portion, which includes a mounting block 4 fixedly mounted on the upper end of the tool holder 2 and two stop blocks 5. The tool holder 2, mounting block 4, and stop blocks 5 are integrally formed. The two stop blocks 5 are located at both ends of the mounting block 4. Multiple cutter heads 3 are fixedly mounted on the mounting block 4. The cutter heads 3 are shell cutters with a cutting angle α of 50-60°. Compared to traditional 40° cutting angle tearing cutters, this effectively improves the penetration of the cutter heads 3 and increases cutting efficiency.

[0033] The lower part of the cutter head 3 has a through groove 7 that matches the outer side of the mounting block 4. Specifically, the mounting block 4 passes through the through groove 7 and matches the through groove 7. The cutter head 3 is fixedly connected to the mounting block 4 by bolts. The bolts pass through the cutter head 3 and the mounting block 4 and are then threaded with nuts to achieve the fixed installation of the cutter head 3. Specifically, the through groove 7 has first through holes 8 on both opposite sides. The two mounting blocks 4 have multiple second through holes 9. The two first through holes 8 on the same cutter head 3 correspond to one of the second through holes 9. The bolts pass through the corresponding first through holes 8 and second through holes 9 and are then fixed by nuts.

[0034] like Figure 6-7 As shown, countersunk holes are provided at both ends of the cutter head 3 to accommodate bolt caps and nuts respectively. The countersunk hole for accommodating bolt caps is circular and does not affect the rotation and installation of bolts. The countersunk hole for accommodating nuts matches the nuts. Furthermore, the countersunk holes protect the bolts and nuts from wear during the cutting process. It should be noted that after the bolts and nuts are installed, glass glue is applied to the countersunk holes to prevent the bolt and nut surfaces from rusting.

[0035] A limiting piece 10 is provided on one side of the cutter head 3. The limiting piece 10 is fixedly connected to multiple bolts. The ends of the bolts are welded and fixed to the limiting piece 10. Specifically, the limiting piece 10 is spot-welded and fixedly connected to the bolt cap to limit the rotation of the bolt and prevent the bolt from loosening due to cutting vibration.

[0036] The upper part of each of the two stop blocks 5 is higher than that of the mounting block 4. The cutter head 3 is positioned between the two stop blocks 5. The two stop blocks 5 and the mounting block 4 work together to support the cutter head 3 when it is subjected to a load in the front-back direction.

[0037] The cutter head 3 is fixedly provided with retaining edges 6 at both ends. The upper side of the retaining edge 6 is lower than the upper side of the alloy on the cutter head 3. The retaining edge 6 is integrally formed with the base of the cutter head 3. On the one hand, the retaining edge 6 is lower than the alloy on the cutter head 3, that is, the height of the retaining edge 6 should not be too high to avoid affecting the penetration of the cutter head. On the other hand, it supports the alloy on both sides of the cutter head 3, improves the bonding strength between the hard alloy of the cutter head 3 and the base, and prevents the alloy from peeling off.

[0038] The spacing between the cutting trajectories of any two adjacent tool heads 3 is the same, such as... Figure 9 The diagram shows a conventional tearing cutter mounted on the cutter head 1. The distance between the cutting trajectories of any two adjacent cutter heads 3 is denoted as P.

[0039] When two cutter heads 3 are positioned between the two stops 5, such as Figure 8 As shown, the distance between the cutting trajectories of any two adjacent cutting heads 3 in this utility model is half of the distance between the cutting trajectories of adjacent cutting heads in existing tools, which is P / 2.

[0040] Furthermore, the number of cutter heads between the two stops 5 of this utility model is not limited to two, provided that the size requirements are met. When it is set to three, the distance between the cutting trajectories of any two adjacent cutter heads 3 is one-third of the existing cutter head cutting trajectory distance, and so on. By reducing the cutter spacing, the load-bearing capacity of the cutter is increased, the overall durability of the cutter is improved, the cutting performance of the cutter is improved, and the efficiency of crushing concrete pile foundations is significantly improved.

[0041] When breaking concrete pile foundations, such as Figure 8 As shown, the dashed line represents the cutting trajectory of the cutter head 3 as it rotates with the cutter head 1. By reducing the distance between two adjacent cutting trajectories, the cutting performance of the tool is improved, thereby increasing the efficiency of crushing concrete pile foundations.

[0042] The cutter head 3 is installed with bolts to ensure a tight installation and allows for quick replacement when the cutter head 3 is severely worn. The bolts are fixed by the limiting plate 10 to prevent the bolts from loosening due to vibration during the cutting process. The cutter head 3 is supported and limited in the front and rear directions by two stops 5, and supported and limited in the left and right directions by the mounting block 4 cooperating with the through groove 7. This effectively improves the connection strength between the cutter head 3 and the tool holder 2 in the working chamber and the installation firmness of the cutter head 3. At the same time, the thickened retaining edge 6 effectively prevents the two alloy pieces at both ends of the cutter head 3 from peeling off, improves the durability of the cutter head 3, and ensures the bonding strength between the base body and the alloy of the cutter head 3.

[0043] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A concrete cutting tool for a tunnel boring machine, comprising multiple concrete cutting tools fixedly mounted on the cutterhead (1) of the tunnel boring machine, wherein the multiple concrete cutting tools are arranged radially staggered along the cutterhead (1), characterized in that, It includes a tool holder (2) and a tool head (3). The tool holder (2) is provided with a mounting part. The mounting part includes a mounting block (4) fixedly installed on the upper end of the tool holder (2) and two stops (5). The two stops (5) are located at both ends of the mounting block (4). The upper part of the stops (5) is higher than the mounting block (4). Multiple cutter heads (3) are fixedly installed on the mounting block (4). The cutter heads (3) are located between two stop blocks (5). Both ends of the cutter heads (3) are fixedly provided with stop edges (6). The upper side of the stop edges (6) is lower than the upper side of the alloy on the cutter head (3).

2. The concrete cutting tool for a tunnel boring machine according to claim 1, characterized in that, The blade (3) is a shell blade, and the cutting angle α of the blade (3) is 50-60°.

3. A concrete cutting tool for a tunnel boring machine according to claim 1, characterized in that, The cutter head (3) is fixedly connected to the mounting block (4) by bolts.

4. A concrete cutting tool for a tunnel boring machine according to claim 3, characterized in that, A limiting piece (10) is provided on one side of the cutter head (3), and the limiting piece (10) is fixedly connected to multiple bolts.

5. A concrete cutting tool for a tunnel boring machine according to claim 4, characterized in that, The bolt end is welded and fixed to the limiting piece (10).

6. A concrete cutting tool for a tunnel boring machine according to claim 3, characterized in that, The lower part of the cutter head (3) is provided with a through groove (7) that matches the outer side of the mounting block (4). The through groove (7) is provided with a first through hole (8) on both opposite sides. The two mounting blocks (4) are provided with multiple second through holes (9). The two first through holes (8) on the same cutter head (3) correspond to one of the second through holes (9). The bolt passes through the corresponding first through hole (8) and second through hole (9).

7. A concrete cutting tool for a tunnel boring machine according to claim 1, characterized in that, The distance between the cutting trajectories of any two adjacent cutter heads (3) is the same.

8. A concrete cutting tool for a tunnel boring machine according to claim 1, characterized in that, Two cutter heads (3) are provided between the two stops (5).

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