Device and method for repairing deformation of shield tail of shield tunneling machine
By installing deformation repair devices in the shield tail of the shield machine, using jack and strain gauge monitoring technology, the deformation problem caused by the shield tail is solved due to geological complexity, and the safe and rapid repair of the shield tail is achieved, avoiding the complexity of external reinforcement. Sex and high cost.
Patent Information
- Application Number
- CN202310824873.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-06
- Publication Date
- 2025-01-07
AI Technical Summary
During the construction of the shield method, the shield tail is prone to partial depression or deformation when facing factors such as complex geology, bedrock protrusions and lonely stone formations, resulting in the shield machine being unable to dig normally, which poses huge safety hazards. The existing technology requires the shield. The external reinforcement of the mechanism is carried out with a long cycle and high cost.
Design a shield tail deformation repair device for shield mechanism, including door frame, walking beam, external and internal support, hydraulic jack and mechanical jack. By installing the device in the shield tail, using the jack step by step force and strain gauge monitoring, Achieve the repair of the shield tail and monitor and cut the lining plate in real time during the repair process to ensure uniform stress and safety.
This device can directly repair the shield tail in the shield machine, avoid external reinforcement, short cycle and low cost, and the structure can be detached and reused to ensure safety and achieve effective repair of the shield tail.
Smart Images
Figure CN119266841A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of urban underground engineering construction, and is aimed at tunnels constructed using the shield method, especially in tunnel engineering construction fields with complex and changeable geology, raised bedrock, isolated rock formations, etc., and specifically relates to a shield tail deformation repair device and repair method. Background Art
[0002] With the demand for urban construction, there are more and more underground tunnel projects, so the use rate of shield method has greatly increased. However, during the construction of shield method, the shield tail is affected by factors such as bedrock protrusions and isolated rock formations in the geology, which causes the shield tail to be partially sunken or deformed, which will cause the shield machine to be unable to dig normally, resulting in huge safety hazards. Although there are deformation repair technologies in the existing technology, it requires responsible reinforcement measures on the outside of the shield machine, which is complicated to operate and has a long cycle. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a shield tail deformation repair device and repair method. There is no need to perform complicated reinforcement measures on the outside of the shield machine. Repairs can be performed directly inside the shield tail of the shield machine, and deformation conditions can be monitored in real time. The device can be disassembled and reused. While ensuring safety, the implementation cycle is short and the repair cost is low.
[0004] The present invention is achieved through the following technical solutions: A shield tail deformation repair device for a shield machine comprises a portal frame, a walking beam is arranged at the bottom of the portal frame, and a plurality of walking beam columns are arranged at the bottom of the walking beam; The left and right wings of the portal frame are provided with two layers of external horizontal supports, the external vertical supports are provided on the external horizontal supports of the upper left layer, a first vertical support is provided on the left side of the top of the portal frame, and a jack base is also provided on the top of the portal frame, and a plurality of jacks are provided on the jack base.
[0005] Furthermore, the portal frame is provided with internal transverse braces, internal vertical braces and internal diagonal braces.
[0006] Furthermore, the left side of the jack base is supported on the top of the portal frame by a third diagonal brace, and the right side is supported on the external cross brace of the upper layer on the right side by a third diagonal brace.
[0007] Furthermore, a vertical brace and a first diagonal brace are arranged between the two layers of external transverse supports on the right side, and a second diagonal brace is arranged between the external transverse support of the lower layer and the walking beam.
[0008] A method for repairing the deformation of a shield tail of a shield machine, using the shield tail deformation repair device of the present invention to repair the deformation of the shield tail, comprising the following steps: S1. Install the shield tail deformation repair device of the shield machine in the shield tail circle within the shield tail deformation area, weld the top of the external vertical support to the shield tail, and weld the top of the first vertical support to the shield tail; the ends of the walking beam column and the external horizontal support are in contact with the inner surface of the shield tail; S2. Set strain gauges at the connection between the portal frame and the shield tail; S3. Install multiple hydraulic jacks on the jack base. Apply force in the middle first and then on both sides to support the shield tail sandwich ribs. Use the sandwich ribs to evenly bear the force. Monitor the repair of the shield tail through a total station and strain gauges. S4. Cut the lining plate in the area on both sides of the hydraulic jack, and continuously monitor during the cutting process. If any abnormality is found, stop immediately; S5. Support the arc-shaped ribs at the opening, use multiple mechanical jacks to follow the support, and evenly apply force with the hydraulic jack. Heat the sandwich ribs during the jacking process. Real-time monitoring is carried out during the process until the shield tail returns to its original state. After each force application, a total station is used to monitor the recovery of the deformation area of the shield tail and keep records; Under the support of hydraulic jacks, the remaining lining plates within the affected area are cut off piece by piece, annular ribs are added between the original annular ribs, and the ribs are welded to strengthen the grease pipeline position. The welds are inspected by flaw detection. The jacks are unloaded one by one, and the process is continuously monitored. The lining plates can be restored only after the deformation monitoring is stable. After all the lining plates are welded, the welds are inspected by flaw detection.
[0009] Furthermore, the number of hydraulic jacks is 3 and the number of mechanical jacks is 4.
[0010] Furthermore, water-stopping operations are first performed on the outside of the shield tail. The water-stopping operations include replenishing shield tail grease through a grease pump, injecting mud effect on the outside of the shield body, and taking double-liquid grouting measures to remove the shield tail segment.
[0011] Furthermore, in step S4, a line should be drawn before cutting, the incision should be straight, and the grease tube should be protected during cutting.
[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The shield tail deformation repair method of the shield machine described in the present invention utilizes the shield tail deformation repair device of the shield machine, and the shield tail is repaired by using technologies such as step-by-step force application by jacks and auxiliary monitoring by strain gauges. This shield tail deformation repair method does not require complex reinforcement measures outside the shield machine, and can be repaired directly inside the shield tail of the shield machine. It can also switch multi-angle repair positions, monitor deformation conditions in real time, etc. What is important is that this device is detachable and recyclable. On the premise of ensuring safety, the implementation cycle is short and the repair cost is low; 2. The shield tail deformation repair device for a shield machine described in the present invention has a firm structure, is easy to disassemble, has a high turnover and reuse rate, and is convenient for repairing deformation inside the shield tail. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the structure of the shield tail deformation repair device for a shield machine according to the present invention; Figure 2 This is a cross-sectional view of the shield tail deformation repair device for a shield machine according to the present invention; Figure 3 This is a schematic diagram of strain gauge installation; Figure 4 It is a schematic diagram of the position of the jack and the shield tail sandwich rib; In the figure: 1, shield tail, 2, walking beam, 3, portal frame, 4, internal horizontal brace, 5, internal vertical brace, 6, internal diagonal brace, 7, walking beam column, 8, external horizontal support, 91, external vertical support, 92, first vertical support, 10, vertical support, 11, first diagonal brace, 12, second diagonal brace, 13, jack base, 14, third diagonal brace, 15, strain gauge, 16, hydraulic jack, 17, mechanical jack, 18, sandwich rib. DETAILED DESCRIPTION
[0014] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0015] In the description of the invention, it should be understood that the terms "front", "rear", "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the invention. The invention is further described below in conjunction with the drawings and embodiments.
[0016] like Figure 1-4As shown, this embodiment discloses a shield tail deformation repair device for a shield machine, including a portal frame 3, which is welded with 300H steel, a walking beam 2 is welded at the bottom of the portal frame 3, and a plurality of 300H steel supports are added at the bottom of the walking beam 2 as walking beam columns 7. Two layers of 200H steel cross braces are welded on the left and right wings of the portal frame 3 to serve as external cross braces 8. The portal frame 3 has been verified by finite element ANSYS and can meet the maximum force of 1000t. An internal cross brace 4, an internal vertical brace 5 and two internal diagonal braces 6 are welded inside the portal frame 3 to increase its own stability. An external vertical support 91 is provided on the external horizontal support 8 of the upper layer on the left side, a first vertical support 92 is provided on the left side of the top of the portal frame, and a jack base 13 is also provided on the top of the portal frame 3 to support the jack. The jack base 13 is made of double-piece 300H steel, and the interior of the steel is reinforced with ribs with a spacing of 120mm. The upper and lower parts are connected as a whole with steel plates. The left side of the jack base 13 is supported on the top of the portal frame 3 by a third diagonal brace, and the right side is supported on the external horizontal brace of the upper layer on the right side by a third diagonal brace to ensure its integrity and stability. In order to make the jack evenly stressed, the jack base 13 is welded and fixed firmly to the portal frame. A vertical brace 10 and a first diagonal brace 11 are welded between the two layers of external horizontal supports 8 on the right side, and a second diagonal brace 12 is welded between the external horizontal support 8 of the lower layer and the walking beam 2 to increase its stability and rigidity.
[0017] Before repairing the deformation of the shield tail 1, a water-stopping operation is performed on the outside of the shield tail. The water-stopping operation on the outside of the shield tail includes but is not limited to replenishing shield tail grease through a grease pump, injecting mud effect on the outside of the shield body, and removing the shield tail segment with double liquid grouting, etc., to enhance the sealing of the shield tail and prevent groundwater from entering the shield machine. Based on the shield tail deformation repair device described in this embodiment, this embodiment also discloses a shield tail deformation repair method for a shield machine, including the following steps: S1. Install the shield tail deformation repair device of the shield machine in the shield tail circle within the shield tail deformation area, weld the top of the external vertical support 91 to the shield tail, weld the top of the first vertical support 92 to the shield tail, and the ends of the walking beam column 7 and the external horizontal support 8 are in contact with the inner surface of the shield tail; S2, a strain gauge 15 is provided at the connection between the portal frame 3 and the shield tail; S3. Install three 300t hydraulic jacks 16 on the jack base 13. Apply force to the hydraulic jacks 16 in the order of the middle first and then the two sides to support the shield tail sandwich ribs 18. Use the sandwich ribs 18 to evenly bear the force and keep the direction straight. Monitor the repair of the shield tail through a total station and strain gauges. S4. The lining plates on both sides of the hydraulic jack 16 are cut open. Lines should be drawn before cutting. The cuts should be straight. Pay attention to protecting the grease pipe during cutting. Cut the openings one by one. Keep monitoring during the cutting process. Stop immediately if any abnormality is found. S5. Support 120*200mm arc ribs at the opening, use four 100t mechanical jacks 17 to follow the jacking, and evenly apply force with the hydraulic jack 16. Heat the sandwich ribs during the jacking process. Real-time monitoring is carried out during the process until the shield tail returns to its original state. After each force application, a total station is used to monitor the recovery of the deformation area of the shield tail, and records are kept; Under the support of the hydraulic jack 16, the remaining lining plates within the affected area are cut off piece by piece, annular ribs are added between the original annular ribs, and the ribs are welded to strengthen the grease pipeline position. The welds are inspected by flaw detection. The jacks are unloaded one by one, and the process is continuously monitored. The lining plates can be restored only after the deformation monitoring is stable. After all the lining plates are welded, the welds are inspected by flaw detection.
Claims
1. A shield tail deformation repair device for a shield machine, characterized in that: It comprises a portal frame, a walking beam is arranged at the bottom of the portal frame, and a plurality of walking beam columns are arranged at the bottom of the walking beam; The left and right wings of the portal frame are provided with two layers of external horizontal supports, the external vertical supports are provided on the external horizontal supports of the upper left layer, a first vertical support is provided on the left side of the top of the portal frame, and a jack base is also provided on the top of the portal frame, and a plurality of jacks are provided on the jack base.
2. The shield tail deformation repair device of a shield machine according to claim 1 is characterized in that: The portal frame is provided with internal horizontal braces, internal vertical braces and internal diagonal braces.
3. The shield tail deformation repair device of a shield machine according to claim 1 is characterized in that: The left side of the jack base is supported on the top of the portal frame by a third diagonal brace, and the right side is supported on the external cross brace of the upper layer on the right side by a third diagonal brace.
4. The shield tail deformation repair device of a shield machine according to any one of claims 1 to 3, characterized in that: A vertical brace and a first diagonal brace are arranged between the two layers of external transverse supports on the right side, and a second diagonal brace is arranged between the external transverse support of the lower layer and the walking beam.
5. A method for repairing deformation of shield tail of a shield machine, characterized in that: The shield tail deformation repair device of the shield machine according to claim 1 is used to repair the shield tail deformation, comprising the following steps: S1. Install the shield tail deformation repair device of the shield machine in the shield tail circle within the shield tail deformation area, weld the top of the external vertical support to the shield tail, and weld the top of the first vertical support to the shield tail; the ends of the walking beam column and the external horizontal support are in contact with the inner surface of the shield tail; S2. Set strain gauges at the connection between the portal frame and the shield tail; S3. Install multiple hydraulic jacks on the jack base. Apply force in the middle first and then on both sides to support the shield tail sandwich ribs. Use the sandwich ribs to evenly bear the force. Monitor the repair of the shield tail through a total station and strain gauges. S4. Cut the lining plate in the area on both sides of the hydraulic jack, and continuously monitor during the cutting process. If any abnormality is found, stop immediately; S5. Support the arc-shaped ribs at the opening, use multiple mechanical jacks to follow the support, and evenly apply force with the hydraulic jack. Heat the sandwich ribs during the jacking process. Real-time monitoring is carried out during the process until the shield tail returns to its original state. After each force application, a total station is used to monitor the recovery of the deformation area of the shield tail and keep records; Under the support of hydraulic jacks, the remaining lining plates within the affected area are cut off piece by piece, annular ribs are added between the original annular ribs, and the ribs are welded to strengthen the grease pipeline position. The welds are inspected by flaw detection. The jacks are unloaded one by one, and the process is continuously monitored. The lining plates can be restored only after the deformation monitoring is stable. After all the lining plates are welded, the welds are inspected by flaw detection.
6. The shield tail deformation repair method of a shield machine according to claim 5, characterized in that: There are 3 hydraulic jacks and 4 mechanical jacks.
7. The shield tail deformation repair method of a shield machine according to claim 5, characterized in that: First, water-stopping operations are performed on the outside of the shield tail. The water-stopping operations include replenishing shield tail grease through a grease pump, injecting mud effect on the outside of the shield body, and taking double-liquid grouting measures to remove the shield tail segment.
8. The shield tail deformation repair method of a shield machine according to claim 5, characterized in that: In step S4, a line should be drawn before cutting, the cut should be straight, and the grease tube should be protected during cutting.