Large-diameter slurry shield hob fishing tool

Abstract

The utility model provides a large-diameter slurry shield hob fishing tool, which solves the problem that a lifting appliance and a hob shaft are difficult to connect when a hob falls into slurry residue soil, is convenient to mount and connect and improves fishing efficiency, and comprises an annular interlocking piece which is used for being sleeved on the hob shaft of the hob, the side wall of the interlocking piece is in threaded connection with a lead screw, and a hanging ring is arranged at the outer end of the lead screw. When the interlocking piece is connected to the hob shaft of the hob in a sleeving mode, the lead screw is screwed into the side face of the hob shaft to abut against the hob shaft.

Description

Technical Field

[0001] This utility model relates to the field of large-diameter slurry shield tunneling technology, specifically to a large-diameter slurry shield cutterhead retrieval tool. Background Technology

[0002] Due to factors such as geological conditions and cutter lifespan, regular cutter replacement is necessary during the construction of large shield tunnels to ensure the normal operation of the cutterhead and improve work efficiency. The purpose of cutter replacement is to replace old cutters and ensure that new cutters can be accurately installed on the cutterhead of the tunnel boring machine.

[0003] Large-diameter slurry shield tunneling machines (TBMs) typically employ a compressed air method with slurry at the bottom and compressed air at the top during cutterhead replacement to ensure the stability of the excavation face. Operating the TBM cutterhead replacement in the confined space between the cutterhead and the tunnel face is challenging due to the limited operating space and operator errors, sometimes resulting in the cutterhead falling into the slurry and debris at the tunnel face. The slurry depth is approximately 7 meters or more, requiring operators in specialized diving suits to descend to the bottom and retrieve the cutterhead. Since the cutterheads of large-diameter slurry shield tunneling machines weigh 200-300 kg, they require external traction tools (such as electric hoists) and steel cables to connect to them. Current technology involves pre-drilling bolt holes on the cutterhead shaft, connecting one end of a steel cable to a bolt, and then connecting the bolt to the bolt holes to achieve a complete connection. The cutterhead is then retrieved using the steel cable. However, the muddy water contained a lot of mud, and the bolt holes of the cutting tool shaft were filled with mud, making it impossible to properly connect and install the tool with the lifting equipment. At the same time, the workers had to stay submerged at the bottom of the muddy water for a long time, which was not safe, making the salvage process even more difficult. Utility Model Content

[0004] This utility model provides a large-diameter slurry shield tunnel cutterhead salvage tool, which solves the problem of difficulty in connecting the lifting device and the cutterhead shaft in slurry, facilitates installation and connection, and improves salvage efficiency.

[0005] This utility model is achieved through the following technical solution:

[0006] A tool for salvaging cutterheads from large-diameter slurry shield tunnels includes an annular locking component for fitting onto the cutter shaft of the cutterhead. A lead screw is threaded onto the side wall of the locking component, and a lifting ring is provided at the outer end of the lead screw.

[0007] When the locking element is fitted onto the cutter shaft of the hob, the lead screw is screwed into and tightens the side of the cutter shaft.

[0008] Furthermore, a nut is welded to the outer wall of the locking component, and the lower end of the lead screw is sequentially threaded to the nut and the side wall of the locking component.

[0009] Furthermore, the outer wall of the locking member is also threaded with multiple auxiliary locking bolts.

[0010] Furthermore, the locking component is made of Q355 material, the inner diameter of the locking component is 100-150mm, and the thickness of the locking component is 10-20mm.

[0011] Furthermore, the lifting ring is welded to the upper end of the lead screw as a single unit.

[0012] The beneficial effects achieved by this utility model compared with the prior art are as follows:

[0013] 1. When it is necessary to retrieve the cutting tool at the working face, the staff put on diving suits and enter the muddy water. They then attach the locking piece to the cutting shaft of the roller cutter, rotate the screw and tighten it into the side of the cutting shaft to achieve a fixed connection between the cutting tool and the locking piece. The lifting ring is then connected to the wire rope of the external traction device to retrieve the roller cutter. The installation process is simple and quick, which greatly improves the safety and efficiency of the retrieval.

[0014] 2. The outer wall of the locking component is welded with a nut, and the lower end of the screw is sequentially threaded to the nut and the side wall of the locking component, thereby improving the firmness of the connection between the screw and the locking component, improving the traction force bearing capacity, and ensuring safety during the salvage process;

[0015] 3. The outer wall of the locking component is threaded with multiple auxiliary locking bolts, which can fix the tool shaft at multiple angles and improve the firmness of the connected tool. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall large-diameter slurry shield tunnel cutter head salvage tool described in this utility model;

[0017] Figure 2 This is a schematic diagram showing the cooperation between the large-diameter slurry shield tunnel cutter head and the cutter shaft of the present invention.

[0018] Figure 3 This is a front view of the large-diameter slurry shield cutter head salvage tool described in this utility model;

[0019] In the diagram: 1. Locking element, 2. Lead screw, 3. Lifting ring, 4. Cutting shaft, 5. Nut, 6. Auxiliary locking bolt. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and 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 utility model.

[0022] like Figure 1 As shown, this embodiment discloses a tool for retrieving cutterheads from a large-diameter slurry shield tunnel, including a locking component 1, a lead screw 2, and a lifting ring 3. The locking component 1 is made of Q355 material and is ring-shaped. It is used to fit onto the cutter shaft of the cutterhead. Since the outer diameter of the cutter shaft of a large-diameter slurry shield tunnel is approximately 100mm, in this embodiment, the parameters are designed as follows: the inner diameter of the locking component 1 is 100mm, the thickness of the locking component 1 is 10mm, and the width is 50mm.

[0023] A mounting hole is machined on the side wall of the locking component 1, and a nut 5 is welded to the outside of the mounting hole. The lower part of the lead screw 2 can be threaded to the nut 5 and pass through the mounting hole. In order to facilitate the connection with the wire rope of the traction device, the lifting ring 3 is welded to the outer end of the lead screw 2. When the locking component 1 is sleeved on the cutter shaft of the hob, the lead screw 2 is screwed into and tightens the side of the cutter shaft.

[0024] The specific working process of the large-diameter slurry shield tunnel cutterhead salvage tool described in this embodiment is as follows:

[0025] like Figure 2 As shown, if the cutter head falls into the mud and water at the working face when the cutter head retracts, manual retrieval is required. The lifting ring 3 is connected to the wire rope of the external traction device (usually an electric hoist) beforehand. Workers wearing diving suits enter the mud and water, attach the locking piece 1 to the cutter shaft 4 of the cutter head, and screw the rotating screw 2 into the side of the shaft 4 to secure the cutter head. This achieves a fixed connection between the cutter head and the locking piece 1. Since the lifting ring 3 is connected to the wire rope of the external traction device, the traction device operates, thus retrieving the cutter head. The installation process is simple and quick, greatly improving retrieval safety and efficiency.

[0026] It is worth noting that in actual use, such as Figure 3 As shown, three auxiliary locking bolts 6 can be threaded onto the outer wall of the locking component 1. The auxiliary locking bolts 6 can further securely fix the cutter shaft and prevent the locking component 1 from detaching from the cutter shaft during the salvage process.

Claims

1. A large-diameter slurry shield tunneling cutterhead salvage tool, characterized in that, It includes an annular locking member for fitting onto the cutter shaft of a hob, and a lead screw is threaded onto the side wall of the locking member, with a lifting ring at the outer end of the lead screw; When the locking element is fitted onto the cutter shaft of the hob, the lead screw is screwed into and tightens the side of the cutter shaft.

2. The large-diameter slurry shield tunnel cutterhead salvage tool according to claim 1, characterized in that, The outer wall of the locking component is welded with a nut, and the lower end of the lead screw is sequentially threaded to the nut and the side wall of the locking component.

3. The large-diameter slurry shield tunnel cutterhead salvage tool according to claim 1, characterized in that, The outer wall of the locking component is also threaded with multiple auxiliary locking bolts.

4. The large-diameter slurry shield tunnel cutterhead salvage tool according to claim 2, characterized in that, The locking component is made of Q355 material, with an inner diameter of 100-150mm and a thickness of 10-20mm.

5. The large-diameter slurry shield tunnel cutterhead salvage tool according to any one of claims 1-4, characterized in that, The lifting ring is welded to the upper end of the lead screw as a single unit.

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