Shield tail brush capable of monitoring stirrup force in real time

Abstract

The utility model relates to a shield tail brush of real -time monitoring stirrup force, and especially relates to a shield tail brush of real -time monitoring stirrup force. Its including shield tail brush body, it is by bottom plate, lower bending plate, steel wire brush group, upper bending plate subassembly and apron pressure -stamping in turn and is composed, still including the stress monitoring unit of being placed in the shield tail brush body, be used for the mechanical strain conversion for electric signal output, stress detection unit includes stress sensitive sheet and elastic plate, elastic plate sets up between stress sensitive sheet with corresponding protection plate. The utility model has the beneficial effect that: the utility model through the mutual cooperation of accurate design pressure -stamping subassembly, layered protection structure and stress detection unit, realized direct measurement and real -time monitoring to the radial stirrup force that shield tail brush bore in the working process.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine technology, and in particular to a tail brush that can monitor the force of the stirrups in real time. Background Technology

[0002] With the development of tunnel boring machine (TBM) technology, the tail brush, as an important component of the TBM's sealing system, plays a crucial role in preventing groundwater and sediment from seeping into the tunnel. However, current technologies lack real-time monitoring methods for the stress experienced by the tail brush during actual operation, making it impossible to promptly grasp its wear, deformation, or failure status, thus affecting the safety and efficiency of TBM construction.

[0003] A search revealed a patent (CN104314580B) for a tail seal brush and a tunnel boring machine (TBM) for monitoring the pressure of the tail seal grease chamber. This patent achieves real-time monitoring of the tail seal grease chamber pressure by incorporating a pressure sensor and a wireless signal transmitter inside the seal brush, thus improving safety during TBM construction. However, this solution only focuses on pressure changes within the grease chamber and does not address monitoring mechanical parameters such as the force exerted on the tail seal brush during contact with the tunnel lining segments. Therefore, it cannot comprehensively reflect the actual stress state of the tail seal brush.

[0004] In addition, a patent with patent number CN113431593B was found, which describes a tunnel boring machine and its tail brush dynamic sealing performance monitoring and control method. This patent integrates monitoring sensors into the tail brush structure, enabling real-time monitoring of the wear and deformation of the tail brush. Combined with a control system, it automatically adjusts the grease injection amount to achieve dynamic management of the tail brush sealing performance. However, this technical solution primarily focuses on feedback control of wear and grease pressure, failing to directly measure and analyze the radial stirrup force borne by the tail brush during operation. Therefore, it has limitations in determining whether the tail brush has experienced localized failure due to uneven stress.

[0005] The aforementioned problems indicate that while current tail brush technology has made some progress in monitoring sealing performance, it still lacks the ability to monitor the stirrup force exerted on the tail brush in real time and with precision. This makes it difficult to meet the higher requirements of modern tunnel boring machines (TBMs) for intelligent and highly reliable sealing systems. Therefore, there is an urgent need to develop a tail brush capable of real-time monitoring of stirrup force to compensate for the shortcomings of existing technologies and improve the safety and controllability of the TBM construction process. Utility Model Content

[0006] The purpose of this invention is to provide a shield tail brush that can monitor the force of the stirrups in real time, so as to overcome the above-mentioned shortcomings of the existing technology.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A shield tail brush capable of real-time monitoring of stirrup force includes a shield tail brush body, which is composed of a base plate, a lower bending plate, a wire brush assembly, an upper bending plate assembly, and a cover plate stacked sequentially. The lower bending plate and the upper bending plate assembly both curve upwards towards the side opposite to the base plate, and the base plate and the cover plate are fixed by several connectors. The upper bending plate assembly includes a left inner protective plate, a right inner protective plate, and an outer front protective plate. The left inner protective plate and the right inner protective plate are arranged alternately on the left and right sides, and their ends overlap each other. The outer front protective plate is located in front of the left inner protective plate and the right inner protective plate and is placed between them. It also includes a stress monitoring unit placed inside the shield tail brush body. The stress monitoring unit is attached to the rear surface of the left inner protective plate and the right inner protective plate and is used to convert mechanical strain into electrical signal output. The stress monitoring unit includes a stress-sensitive sheet and an elastic plate. The elastic plate is disposed between the stress-sensitive sheet and the corresponding protective plate.

[0008] Preferably, it also includes a signal transmission module, which is connected to the stress monitoring unit via a wiring harness, for transmitting the detected strain signal to an external monitor; the wiring harness extends from the end of the cover plate and is connected to the external monitor.

[0009] Preferably, the ends of the left inner protective plate and the right inner protective plate extend outward beyond both sides of the outer front protective plate.

[0010] Preferably, the stress-sensitive sheet is fixed to the rear surface of the left inner protective plate or the right inner protective plate by adhesive bonding.

[0011] Preferably, the elastic plate is made of a highly elastic material and is disposed between the stress-sensitive sheet and the corresponding protective plate.

[0012] Preferably, the cover plate is provided with a wire harness outlet hole, and a rubber sealing ring is embedded in the wire harness outlet hole.

[0013] Preferably, the left inner protective plate, the right inner protective plate, and the outer front protective plate are designed as single-layer, double-layer, triple-layer, or quadruple-layer plates according to the geological construction conditions.

[0014] The beneficial effects of this utility model are: by setting stress-sensitive plates on the rear surfaces of the left inner protective plate and the right inner protective plate, this technical solution realizes the direct measurement of the radial stirrup force borne by the shield tail brush during operation, which makes up for the deficiency of the prior art that cannot monitor the stirrup force in real time. The elastic plate effectively protects the stress-sensitive element from direct impact, while providing a uniform pressure distribution and improving measurement accuracy. The multi-layer plate structure design enables the tail brush to adapt to the construction needs under different geological conditions, improving the equipment's versatility and applicability. By monitoring the stress on the tail brush in real time and analyzing the data in conjunction with the tunnel boring machine control system, local failure risks can be detected in a timely manner and corresponding measures can be taken, thereby significantly improving the safety and efficiency of tunnel boring construction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a shield tail brush capable of real-time monitoring of hoop force according to this utility model; Figure 2 This is a partial schematic diagram of a shield tail brush capable of real-time monitoring of stirrup force according to this utility model; Figure 3 This is a frontal view schematic diagram of a shield tail brush capable of real-time monitoring of stirrup force according to this utility model; Figure 4 This is a schematic diagram of an implementation example of a shield tail brush capable of real-time monitoring of stirrup force according to this utility model; In the diagram: 1. Base plate; 2. Lower bending plate; 3. Wire brush assembly; 4. Upper bending plate assembly; 5. Cover plate; 91. Stress monitoring unit; 6. Left inner protective plate; 7. Right inner protective plate; 8. Outer front protective plate; 9. Stress-sensitive sheet; 10. Elastic plate; 11. Wiring harness. Detailed Implementation

[0016] Reference Figures 1 to 4 A shield tail brush capable of real-time monitoring of stirrup force includes a base plate 1, a lower bending plate 2, a wire brush group 3, an upper bending plate assembly 4, a cover plate 5, and a stress monitoring unit 91. The base plate 1 is located at the very bottom of the entire stacked assembly. Its upper surface is in contact with the bottom surface of the lower bent plate 2, and the two are fixedly connected by several connectors to ensure a tight fit. The lower bent plate 2 curves upwards towards the side opposite to the base plate 1, forming an arc-shaped structure. This structure design allows the lower bent plate 2 to undergo elastic deformation under stress, thereby transmitting external pressure to the internal components. The upper surface of the lower bent plate 2 contacts the bottom end of the wire brush assembly 3. The wire brush assembly 3 is composed of multiple high-strength wear-resistant steel wires arranged in a specific pattern. Its arrangement density and length are optimized according to sealing performance requirements to ensure good sealing performance even under high pressure. The top of the wire brush assembly 3 contacts the bottom surface of the upper bent plate assembly 4. The upper bent plate assembly 4 also curves upwards towards the side opposite to the base plate 1, and its structure is similar to that of the lower bent plate 2, enabling it to undergo elastic deformation synchronously under stress.

[0017] The top surface of the upper bending plate assembly 4 is fitted with the bottom surface of the cover plate 5. The cover plate 5 is fixedly connected to the base plate 1 by bolts or rivets, forming a complete stacked assembly. In actual operation, the stacked assembly is fixedly connected by bolts or rivets, and the components fit tightly together and are easy to disassemble and maintain. For example, when it is necessary to replace the wire brush assembly 3, disassembly can be completed simply by loosening the connector between the cover plate 5 and the base plate 1, which greatly reduces maintenance costs and time. At the same time, the number and thickness of the left inner protective plate 6, right inner protective plate 7, and outer front protective plate 8 can be adjusted to adapt to specific construction environments for different geological conditions, thereby improving the versatility and applicability of the equipment.

[0018] The upper bending plate assembly 4 includes a left inner protective plate 6, a right inner protective plate 7, and an outer front protective plate 8. The left inner protective plate 6 and the right inner protective plate 7 are arranged alternately on the left and right sides, with their ends overlapping each other. This arrangement effectively disperses the radial stirrup force and avoids local stress concentration. The outer front protective plate 8 is located in front of the left inner protective plate 6 and the right inner protective plate 7, and is placed between them to further enhance the overall strength of the layered protective structure. The ends of the left inner protective plate 6 and the right inner protective plate 7 extend outwards beyond both sides of the outer front protective plate 8 to facilitate avoidance of interference during installation. This multi-layered plate structure design not only improves the compressive strength of the shield tail brush but also allows for flexible adjustment of the thickness and number of layers according to different geological conditions to meet the construction needs in soft soil or hard rock geological conditions.

[0019] The stress monitoring unit 91 includes stress-sensitive plates 9 disposed on the rear surfaces of the left inner protective plate 6 and the right inner protective plate 7. The stress-sensitive plates 9 are fixed to the rear surfaces of the corresponding protective plates by adhesive bonding. The working principle of the stress-sensitive plates 9 is based on the strain effect formula ΔR / R=K·ε, where K is the sensitivity coefficient and ε is the strain. When the shield tail brush is deformed by force, the stress-sensitive plates 9 deform synchronously, and their internal resistance changes. By measuring the change in resistance, the strain and stress on the surface of the object can be calculated.

[0020] To further protect and install the stress-sensitive element 9, an elastic plate 10 is placed between the stress-sensitive element 9 and the corresponding protective plate. The elastic plate 10 is made of a highly elastic material, and its function is to protect the stress-sensitive element 9 from direct impact and provide a uniform pressure distribution. The stress monitoring unit also includes a wiring harness 11, which extends from the end of the cover plate 5 and connects to an external monitor to transmit the detected strain signal to the external monitor. The cover plate 5 is provided with a wiring harness outlet hole, in which a rubber sealing ring is embedded. The design of the rubber sealing ring prevents mud and water from entering the shield tail brush and affecting the normal operation of the stress monitoring unit.

[0021] During actual construction, the radial stirrup force borne by the tail brush when it contacts the tunnel lining segments is transmitted to the lower bending plate 2, the wire brush assembly 3, and the upper bending plate assembly 4. For example... Figure 3 As shown, when the radial stirrup force is applied to the tail brush, the lower bending plate 2, the wire brush group 3, and the upper bending plate assembly 4 undergo synchronous elastic deformation, causing the internal stress monitoring unit to deform synchronously. The stress-sensitive element 9 in the stress monitoring unit 91 deforms synchronously due to the uniform pressure distribution of the elastic plate 10, causing a change in its internal resistance value. The wiring harness 11 transmits the detected strain signal to an external monitor. The external monitor transmits the collected stress data to the tunnel boring machine control system via a wireless communication module. Combined with real-time construction parameters, the system analyzes the data to determine if the tail brush has experienced localized failure due to uneven stress and issues a timely warning signal. After exiting from the end of the cover plate 5, the wiring harness 11 connects to the external monitor via a waterproof connector to ensure the stability and reliability of signal transmission. The thickness and number of layers of the left inner protective plate 6, right inner protective plate 7, and outer front protective plate 8 are adjusted according to specific construction conditions to meet the requirements of shield tail brush strength and flexibility under different geological conditions. For example, in soft soil conditions, a single-layer plate can be selected to improve flexibility; while in hard rock conditions, a multi-layer plate can be selected to enhance strength. The arrangement density and length of the wire brush group 3 are optimized according to sealing performance requirements to ensure good sealing performance under high pressure. The stacked components are fixedly connected by bolts or rivets to ensure tight fit between components while facilitating disassembly and maintenance.

[0022] The advantages of this invention lie in its precise design of the overlapping components, layered protection structure, and the coordinated relationship between the stress monitoring unit and the shield tail brush, enabling direct measurement and real-time monitoring of the radial stirrup force borne by the shield tail brush during operation. This process not only overcomes the shortcomings of existing technologies in accurately grasping the stress state of the shield tail brush but also significantly improves the safety and efficiency of shield tunneling.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A shield tail brush capable of real-time monitoring of stirrup force, comprising a shield tail brush body, which is composed of a base plate, a lower bending plate, a wire brush assembly, an upper bending plate assembly, and a cover plate stacked sequentially, wherein the lower bending plate and the upper bending plate assembly are both curved toward the side opposite to the base plate, and the base plate and the cover plate are fixed by a plurality of connecting members, characterized in that: The upper bending plate assembly includes a left inner protective plate, a right inner protective plate, and an outer front protective plate; the left inner protective plate and the right inner protective plate are arranged alternately on the left and right sides, and their ends overlap each other; the outer front protective plate is located in front of the left inner protective plate and the right inner protective plate, and is placed between the two; It also includes a stress monitoring unit placed inside the shield tail brush body. The stress monitoring unit is attached to the rear surface of the left inner protective plate and the right inner protective plate and is used to convert mechanical strain into electrical signal output. The stress monitoring unit includes a stress-sensitive sheet and an elastic plate. The elastic plate is disposed between the stress-sensitive sheet and the corresponding protective plate.

2. The shield tail brush capable of real-time monitoring of stirrup force according to claim 1, characterized in that: It also includes a signal transmission module, which is connected to the stress monitoring unit via a wiring harness to transmit the detected strain signal to an external monitor; the wiring harness extends from the end of the cover plate and is connected to the external monitor.

3. A shield tail brush capable of real-time monitoring of stirrup force according to claim 1, characterized in that: The ends of the left inner protective plate and the right inner protective plate extend outward beyond both sides of the outer front protective plate.

4. A shield tail brush capable of real-time monitoring of stirrup force according to claim 1, characterized in that: The stress-sensitive sheet is fixed to the rear surface of the left inner protective plate or the right inner protective plate by adhesive bonding.

5. A shield tail brush capable of real-time monitoring of stirrup force according to claim 1, characterized in that: The elastic plate is made of a highly elastic material and is disposed between the stress-sensitive sheet and the corresponding protective plate.

6. A shield tail brush capable of real-time monitoring of stirrup force according to claim 1, characterized in that: The cover plate is provided with a wire harness outlet hole, and a rubber sealing ring is embedded in the wire harness outlet hole.

7. A shield tail brush capable of real-time monitoring of stirrup force according to claim 1, characterized in that: The left inner protective plate, right inner protective plate, and outer front protective plate are designed as single-layer, double-layer, triple-layer, or quadruple-layer plates according to geological and construction conditions.

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