A tail brush sealing system for a shield

Abstract

The application belongs to the technical field of shield construction, and provides a shield tail brush sealing system. The sealing performance of the shield tail brush filled with traditional grease is improved by using a specially designed sealing foaming agent, the sealing performance is greatly improved, the service life of the shield tail brush is improved, and then the safety and reliability of the shield tail brush are improved. The replacement frequency of the shield tail brush is effectively reduced, the use cost is reduced, the grease leakage is reduced, and the construction cost is saved. The specially developed foaming agent is liquid, can ensure flowing into any corner of the shield tail brush steel wire, and after staying for a certain time, the AB liquid rapidly generates chemical reaction and foaming. The foam fills all the space of the shield tail brush instantly, so that the shield tail brush immediately forms a compact and rubber-like elastic overall structure, so that the shield tail brush is more resistant to compression, corrosion and solidification. After the foaming agent is injected, the shield tail brush forms a rubber sealing, and the water stopping performance is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of shield construction, and in particular relates to a shield tail brush sealing system. Background Art

[0002] A shield machine is a tunnel boring machine that uses the shield method. Its basic operating principle is that a cylindrical steel assembly excavates the soil as it advances along the tunnel axis. It integrates excavation, soil removal, and lining, and primarily consists of a cutterhead, shield, propulsion system, slag discharge system, and segment assembly machine.

[0003] The main functions of a shield machine include underground tunnel excavation, tunnel support, and maintenance. It enables efficient and rapid tunnel excavation and offers certain environmental advantages. While excavating an underground tunnel, the shield machine ensures tunnel safety and stability by providing support structures. After completing excavation, the shield machine must maintain the underground tunnel, such as sealing water leaks in subway tunnels.

[0004] With the continuous development of tunnel engineering, higher requirements are put forward for shield machines. One important aspect is to improve the sealing performance of shield machines during excavation to prevent mud and water from invading the shield machine and the shield tail of the shield machine from being penetrated by mud and water. After the shield machine is invaded by mud and water and the shield tail is penetrated by mud and water, the shield brush needs to be replaced. Since the operating environment of the shield machine is inside the tunnel and the shield machine is large in size, replacing the shield brush inside the tunnel and sealing the tunnel leaks require extremely high accident risks and capital investment.

[0005] The technical solution of this application is targeted at the shield tail seal of a shield machine. This seal is a critical component of the shield machine's construction process. During tunneling, the shield tail seal effectively blocks the ingress of mud, water, sand, gravel, and slurry, preventing soil from entering the shield machine's working space from the rear, thereby avoiding damage to the machine and personnel. The shield tail seal also seals groundwater. During underground tunneling, groundwater can seep through the soil and enter the tunneling space. An effective shield tail seal prevents groundwater from entering the shield machine's rear, ensuring its normal operation and preventing safety accidents. To improve the sealing effect, the shield tail is typically designed with multiple seals. For example, three seals are designed between the tail shield and the middle shield, including two or three wire brush lip seals and a steel plate shield tail brush seal. Grease is filled between the seals, which not only provides lubrication but also enhances the sealing effect. The steel plate shield tail brush is made of elastic steel plate and effectively prevents mud and sand from entering the shield body. To ensure the effectiveness of the shield tail seal, the tail brushes are difficult to see during tunneling, making it difficult to check for wear unless a leak occurs. Leaks can be indirectly detected by observing the rate of grease loss from the grease chamber and whether water seeps into the shield machine.

[0006] While traditional shield tail brushes employ some measures during tunneling, a number of issues remain. For example, the traditional method involves applying hand-applied grease, using a metal crowbar or other tool, between the wires of the shield tail brush before the shield machine begins excavation. Note that the grease pressed between the wires is a paste-like hand-applied grease. The grease chamber is filled with fluid grease, which is replenished at all times during tunneling. This grease cannot penetrate the shield tail wires properly, compromising the sealing effect. Slurry can intrude into the shield tail, even causing the tail brush to pierce. This can force the shield machine to shut down for repair or even replacement during construction. This not only increases maintenance costs and reduces construction efficiency, but more importantly, increases construction safety risks, potentially endangering personnel and the tunnel itself. Therefore, the search for a more advanced and reliable shield tail brush sealing system has become a pressing need in the current development of shield machine technology. Summary of the Invention

[0007] The present invention aims to provide a shield tail brush sealing system to address the problem of manually applying grease between the wires of the shield tail brush during shield machine manufacturing to maintain a seal. However, due to the gaps between the wires, the traditional grease injection method cannot ensure that the grease is evenly applied to every corner.

[0008] The present invention provides a shield tail brush sealing system, comprising a shield tail sealing device 1, and a liquid injection device used in conjunction with the shield tail sealing device 1;

[0009] The shield tail sealing device 1 includes a shield tail main frame 101, an annular shield tail wire brush layer 102 and an annular steel plate brush layer 103. The shield tail main frame 101 is provided with a wire brush installation area and a steel plate brush installation area;

[0010] The steel plate brush installation area is located at the edge of the end of the shield tail main frame 101, and the steel plate brush installation area is used to install the annular steel plate brush layer 103;

[0011] The shield tail main frame 101 is located on the side of the annular steel plate brush layer 103 and is equipped with a slurry stop plate 105;

[0012] The wire brush installation area is located in the middle of the shield tail main frame 101. A grease bin 104 is provided between the wire brush installation area and the steel plate brush installation area. The wire brush installation area is used to install the annular shield tail wire brush layer 102.

[0013] The annular shield tail steel wire brush layer 102 on the shield tail main body frame 101 is arranged in an intermittent manner, and the annular shield tail steel wire brush layer 102 arranged in an intermittent manner is at least two layers;

[0014] The annular shield tail wire brush layer 102 includes a wire brush and a steel plate brush, both of which are single brushes with a width of about 15-20 cm, which are welded on the main frame to form an overall annular shield tail wire brush layer 102. The shield tail wire brush device 201 includes a wire brush 2001, a shield tail brush base 2002 and a shield tail brush side plate 2003.

[0015] The shield tail brush side plate 2003 includes a first shield tail brush side plate and a second shield tail brush side plate, the shield tail brush base 2002 is connected to the first shield tail brush side plate and the second shield tail brush side plate respectively, the wire brush 2001 is located between the first shield tail brush side plate and the second shield tail brush side plate, and is connected to the shield tail brush base 2002;

[0016] The liquid injection device is used to inject foaming agent into the wire brush 2001 located between the first shield tail brush side plate and the second shield tail brush side plate. The area where the foaming agent is injected is from the shield tail brush base 2002 to the wire brush 2001 between the first shield tail brush side plate and the second shield tail brush side plate. The foaming agent is injected on the wire brush 2001 to form a foaming agent reaction medium layer.

[0017] Furthermore, the present invention provides a shield tail brush sealing system, further comprising:

[0018] The shield tail main frame 101 is configured as a multi-layer frame structure, which includes a steel plate brush installation reserved layer structure, a grease bin structure, and a wire shield tail brush installation reserved layer structure;

[0019] The steel plate brush installation reserved layer structure is used to install the annular steel plate brush layer 103, one end of the annular steel plate brush layer 103 is located on the side of the steel plate brush installation reserved layer structure, and the other end of the annular steel plate brush layer 103 is facing the outside of the annular segment pushed out after the shield machine segment assembly machine is assembled;

[0020] The reserved layer structure for installing the wire shield tail brush is used to install the annular shield tail wire brush layer 102. One end of the annular shield tail wire brush layer 102 is located on the side of the reserved layer structure for installing the wire shield tail brush, and the other end of the annular shield tail wire brush layer 102 faces the outer side of the annular segment pushed out after the shield machine segment assembly machine is assembled.

[0021] The grease bin structure is used to inject liquid grease into the grease bin structure through a fixed oil pressure pump, and the oil pressure in the grease bin structure is monitored at any time through a detection device.

[0022] Furthermore, the present invention provides a shield tail brush sealing system, further comprising:

[0023] The grease bin structure is filled with liquid grease by the liquid injection device, and the liquid grease contacts the wire brush 2001. The liquid grease is used to seal the small gaps that may exist between the shield tail brush and the pipe segment.

[0024] The annular steel plate brush layer 103 includes uniformly distributed steel plate brushes for blocking sand and gravel;

[0025] The foaming agent reaction medium layer on the wire brush 2001 is between the bristles of the wire brush.

[0026] Furthermore, the present invention provides a shield tail brush sealing system, further comprising:

[0027] After the foaming agent is injected through the injection device, it solidifies and foams between the steel brushes 2001 on the annular shield tail steel brush layer 102 to form a foaming agent reaction medium layer, so that all the steel brushes 2001 on the annular shield tail steel brush layer 102 form a dense and elastic overall structure, which is used to improve the sealing and pressure resistance of the annular shield tail steel brush layer 102 to external groundwater, concrete slurry and sand and gravel.

[0028] Furthermore, the present invention provides a shield tail brush sealing system, further comprising:

[0029] The foaming agent is injected into the spaces between the bristles of the wire brush through a handheld injection device before the shield machine starts excavation;

[0030] The liquid grease in the grease chamber is injected into the device through a fixed hydraulic pump.

[0031] The liquid grease in the grease chamber is injected into the grease bin structure through a fixed hydraulic pump.

[0032] Furthermore, the present invention provides a shield tail brush sealing system, further comprising:

[0033] After the liquid injection device uniformly injects the foaming agent into the annular shield tail wire brush layer 102 , the outer side of the annular shield tail wire brush layer 102 is covered with a sealing layer.

[0034] Furthermore, the present invention provides a shield tail brush sealing system, further comprising:

[0035] The sealing layer is configured as a high-strength plastic protective tape, and the plastic sheet is covered during the construction phase of injecting the foaming agent into the wire brush 2001, and is used to bind the foaming agent between the wire brushes 2001, thereby preventing the foaming agent from leaking out of the wire brush 2001 during the chemical reaction and foaming expansion process;

[0036] The foaming agent is injected before assembling the shield tail, and the part of the shield tail joint that has not been injected with foaming agent is replenished before the shield machine starts excavation;

[0037] The shield tail has been assembled on the shield machine, and the foaming agent is injected at the construction site before the shield machine starts excavation.

[0038] Furthermore, the present invention provides a shield tail brush sealing system, wherein the foaming agent of the injection device is AB liquid, and the foaming agent reaction medium layer is formed by injecting the foaming agent into the area between the two annular shield tail wire brush layers 102 through the injection device;

[0039] The position of the AB liquid in the gap of the wire brush 2001 is from the root of the bristles of the wire brush 2001 to the top of the bristles. The AB liquid includes liquid A and liquid B. When liquid A and liquid B are injected, the foam generated by the rapid chemical reaction fills the gap on each steel wire of the wire brush 2001 and forms a foaming agent reaction medium layer. The foaming agent reaction medium layer is an elastic layer with long-term stability and density.

[0040] The beneficial effects of the present invention are as follows: The present invention provides a shield tail brush sealing system. The technical solution of the present invention brings many beneficial effects, aiming to solve the problems existing in traditional shield tail brush sealing systems and improve the performance and construction efficiency of the shield tail brush. The following are the main beneficial effects brought about by the technical solution of the present invention:

[0041] Improved sealing performance: By introducing an injected foaming agent, a chemical reaction forms an integrated, dense structure, effectively improving the sealing performance of the shield tail brush. This full sealing performance prevents external harmful substances such as groundwater, muddy water, and slurry from invading the shield machine, thereby maintaining the stable operation of the shield machine.

[0042] Improved wear resistance and service life: A foaming agent is injected between the steel wires of the shield tail brush, making it more elastic and dense, improving the wear resistance and service life of the shield tail brush. This improvement helps reduce the frequency of shield tail brush replacement, reduces maintenance costs, and extends the service life of the shield tail brush.

[0043] Improved construction safety: After the foaming agent is injected, the dense structure formed by the shield tail brush has higher compressive strength, making it less susceptible to damage. This reduces the risk of water leakage and slurry intrusion due to damage to the shield tail brush, and improves construction safety.

[0044] Improved construction efficiency: The design and injection method of the shield tail brush sealing system improves the construction process. The formation of a dense structure reduces the possibility of uneven lubrication and slurry intrusion, thereby improving the performance and working efficiency of the shield tail brush.

[0045] Reduced maintenance costs: The shield tail brush sealing system improves the wear resistance and service life of the shield tail brush, reducing the frequency of replacement and lowering maintenance costs. In addition, the improved safety during construction also helps reduce accidents, further reducing maintenance and repair expenses.

[0046] Environmental friendliness: The shield tail brush sealing system uses a chemical foaming agent. After grease is injected into the grease cavity, the shield tail brush improves its sealing performance, significantly reducing grease loss in the grease cavity and reducing environmental pollution. In addition, the formation of a dense structure helps prevent mud, water, and slurry from invading the shield machine interior.

[0047] Longer service life during construction: Since the shield tail brush is more durable after being injected with foaming agent, and the formation of a dense structure improves water tightness and wear resistance, the shield tail brush can maintain high performance for a longer time during construction, ensuring the feasibility of long-term and long-distance excavation.

[0048] Reduced construction costs: Traditional shield tail brushes, when damaged, require continuous injection of large amounts of grease to protect against external pressure during construction to ensure construction safety, leading to grease loss. The new sealing system shield tail brush is less susceptible to damage, reducing grease consumption and construction costs.

[0049] Acid-resistant, alkali-resistant and flame-retardant functions: In order to meet the needs of manufacturing, construction and disassembly, the foam formed by the mixture of AB liquid has acid-resistant, alkali-resistant and flame-retardant functions, which increases the service life and reduces the risks in manufacturing and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0051] Figure 1 A schematic diagram of the partial structure of a shield tail sealing device is provided for an embodiment of the present invention.

[0052] Figure 2 Provided for embodiments of the present invention Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.

[0053] Figure 3 Provided for embodiments of the present invention Figure 1 Schematic diagram of the cross-sectional structure at BB in the middle.

[0054] Figure 4 A schematic structural diagram of a shield tail wire brush device is provided for an embodiment of the present invention.

[0055] Figure 5 This is a diagram showing the first angle of use of the shield tail wire brush device after using the technical solution of the present invention.

[0056] Figure 6 This is a diagram showing the second angle of use of the shield tail wire brush device after using the technical solution of the present invention.

[0057] Figure 7 This is a diagram showing the use of the shield tail wire brush device without using the technical solution of the present invention.

[0058] Description of the drawings: 1. Shield tail sealing device, 101. Shield tail brush main frame, 102. Annular shield tail wire brush layer, 103. Annular steel plate brush layer, 104. Grease bin, 105. Slurry stop plate, 201. Shield tail wire brush device, 2001. Wire brush, 2002. Shield tail brush base, 2003. Shield tail brush side plate. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. The technical solutions provided by each embodiment of the present invention are described in detail below in conjunction with the drawings.

[0060] The shield tail brush sealing system provided by this invention is a comprehensive solution designed to improve the sealing performance of the shield tail of a shield machine, prevent impurities such as water and mud from entering the shield machine, and ensure the safety and efficiency of shield construction. The following is a detailed summary and introduction of the shield tail brush sealing system:

[0061] The shield tail brush sealing system is composed of: the shield tail brush sealing system mainly includes two parts: the shield tail sealing device and the liquid injection device.

[0062] The shield tail seal consists of a main shield frame, an annular shield tail wire brush layer, and an annular steel plate brush layer. The main shield frame features two mounting areas for the wire brush and the steel plate brush. The wire brush mounting area is located in the center and features at least two layers of annular shield tail wire brushes arranged in a staggered pattern to enhance seal redundancy and reliability. The steel plate brush mounting area, located at the end edge of the main shield frame, is used to mount the annular steel plate brush layer, further enhancing its ability to block impurities such as sand and gravel.

[0063] Injection device: Used to inject liquid grease and foaming agent into the shield tail brush sealing system. The liquid grease is used to seal the gap between the shield tail brush and the pipe segment, while the foaming agent is used to form a dense and elastic overall structure between the wire brushes, improving the sealing and pressure resistance.

[0064] The shield tail brush sealing system is a technical feature;

[0065] Multi-layer sealing structure: Through the combination of the annular shield tail wire brush layer and the annular steel plate brush layer, a multi-layer sealing structure is formed, which effectively prevents the infiltration of external impurities such as water and mud.

[0066] Foaming agent injection technology: By injecting foaming agent between the wire brushes, it solidifies and foams between the wire brushes, forming a dense and elastic overall structure. This not only improves the sealing performance, but also enhances the pressure and wear resistance of the shield tail brush, extending its service life.

[0067] Liquid grease injection: Liquid grease is injected into the gap between the shield tail brush and the pipe segment through the injection device to further ensure the tightness of the seal. At the same time, the grease can also lubricate and protect the wire brush from rust and damage.

[0068] Easy to maintain and replace: The shield tail brush sealing system is well designed, which makes it easy to maintain and replace the shield tail brush. During long-term use, if the shield tail brush is worn or damaged, it can be easily replaced to ensure the continued effectiveness of the sealing performance.

[0069] In summary, the shield tail brush sealing system provided by the present invention significantly improves the sealing performance and service life of the shield tail of the shield machine by adopting a multi-layer sealing structure, foaming agent injection technology, and liquid grease injection. This provides a strong guarantee for the safety and efficiency of shield construction.

[0070] The shield tail brush sealing system provided by the present invention significantly improves the sealing performance of the shield tail of the shield machine. The shield tail brush sealing system provided by the present invention ensures the high efficiency and safety of shield construction.

[0071] Traditional sealing methods often struggle to address the wear and corrosion issues of shield tail brushes over long-term use. The shield tail brush sealing system provided by this invention addresses this challenge through the use of a foaming agent. By injecting a foaming agent between the wire brushes, a new, dense and resilient structure is created. This significantly improves the shield tail brush's resistance to pressure and wear, while also extending its service life.

[0072] Furthermore, liquid grease can be accurately injected into the gap between the shield tail brush and the pipe segment, thus ensuring a tight seal. At the same time, the lubricating effect of the grease can effectively protect the wire brush from rust and damage, further extending the service life of the equipment.

[0073] In practical applications, this shield tail brush sealing system has demonstrated superior performance and effectiveness. In multiple shield construction projects, it has successfully blocked the intrusion of external impurities, ensuring smooth construction. Furthermore, due to its excellent wear and pressure resistance, the shield tail brush remains in excellent working condition after extended use, reducing maintenance costs and replacement frequency. This not only improves construction efficiency but also provides strong guarantees for the project's economic benefits and safety.

[0074] The present invention provides a shield tail brush sealing system, comprising a shield tail sealing device 1, and a liquid injection device used in conjunction with the shield tail sealing device 1;

[0075] The shield tail sealing device 1 includes a shield tail main frame 101, an annular shield tail wire brush layer 102 and an annular steel plate brush layer 103. The shield tail main frame 101 is provided with a wire brush installation area and a steel plate brush installation area;

[0076] The steel plate brush installation area is located at the edge of the end of the shield tail main frame 101, and the steel plate brush installation area is used to install the annular steel plate brush layer 103;

[0077] The shield tail main frame 101 is located on the side of the annular steel plate brush layer 103 and is equipped with a slurry stop plate 105;

[0078] The wire brush installation area is located in the middle of the shield tail main frame 101. A grease bin 104 is provided between the wire brush installation area and the steel plate brush installation area. The wire brush installation area is used to install the annular shield tail wire brush layer 102.

[0079] The present invention primarily comprises a shield tail sealing device and a liquid injection device used in conjunction with it. The shield tail sealing device is the core component of the system and consists of a main shield tail frame, an annular shield tail wire brush layer, and an annular steel plate brush layer. This structural design aims to improve sealing performance through multiple sealing layers.

[0080] First, the main shield frame is equipped with wire brush and plate brush installation areas. These areas are used to install the annular shield tail wire brush layer and the annular steel plate brush layer, respectively, thus forming a double-layer sealing structure. The annular steel plate brush layer is located at the end edge of the main shield frame, primarily serving as a preliminary barrier to external impurities such as groundwater and mud. The annular shield tail wire brush layer is located in the middle of the main shield frame, forming a second line of defense and further enhancing the sealing effect.

[0081] A slurry stop plate is installed on the side of the annular steel plate brush layer to prevent slurry leakage and enhance the reliability of the sealing system. A grease tank is also located between the wire brush installation area and the steel plate brush installation area. This tank stores liquid grease, which can be injected into the gap between the shield tail brush and the pipe segment through a liquid injection device when necessary to enhance the sealing effect.

[0082] The injection device is another key component of the present invention. It is primarily used to inject liquid grease and a specially designed foaming agent into the shield tail brush sealing system. The liquid grease ensures a tight seal between the shield tail brush and the tube segment, while also providing lubrication and protecting the shield tail brush from damage. The foaming agent, on the other hand, is a special chemical material that reacts rapidly upon injection and foams, forming a dense and elastic overall structure. This structure fills the gaps between the shield tail brushes, further improving sealing performance and enhancing the shield tail brush's resistance to pressure, corrosion, and wear.

[0083] In summary, the technical principle of the present invention is to achieve efficient and reliable sealing of the shield tail of the shield machine through the comprehensive use of multiple means such as a double-layer sealing structure, a slurry stop plate, a grease bin and a liquid injection device.

[0084] The annular shield tail steel wire brush layer 102 on the shield tail main body frame 101 is arranged in an intermittent manner, and the annular shield tail steel wire brush layer 102 arranged in an intermittent manner is at least two layers;

[0085] The annular shield tail wire brush layer 102 includes a wire brush and a steel plate brush, both of which are single brushes with a width of about 15-20 cm, which are welded on the main frame to form an overall annular shield tail wire brush layer 102. The shield tail wire brush device 201 includes a wire brush 2001, a shield tail brush base 2002 and a shield tail brush side plate 2003.

[0086] The wire brush and steel plate brush are both single brushes with a width of about 15-20 cm, which are welded to the main frame to form an overall ring-shaped shield tail brush layer.

[0087] The shield tail brush side plate 2003 includes a first shield tail brush side plate and a second shield tail brush side plate, the shield tail brush base 2002 is connected to the first shield tail brush side plate and the second shield tail brush side plate respectively, the wire brush 2001 is located between the first shield tail brush side plate and the second shield tail brush side plate, and is connected to the shield tail brush base 2002;

[0088] The injection device is used to inject a foaming agent into the wire brush 2001 located between the first and second shield tail brush side plates. The foaming agent is injected into the area from the shield tail brush base 2002 to the wire brush 2001 between the first and second shield tail brush side plates. The foaming agent is injected onto the wire brush 2001 to form a foaming agent reaction medium layer. After the foaming agent completes the chemical reaction, the medium formed is similar to a high-density sponge. The wire brush 2001 is only present between the first and second shield tail brush side plates.

[0089] The shield tail brush sealing system of the present invention further refines the design and working mode of the annular shield tail wire brush layer, as well as how the injection device cooperates with it to improve the sealing effect. The following is a detailed description of the technical principles of the present invention:

[0090] The shield's main frame features at least two layers of circular wire brushes arranged in staggered patterns. This design increases seal redundancy and reliability, ensuring that even if a brush layer fails, the remaining layers can still provide an effective seal. Each layer consists of multiple individual brushes, approximately 15-20 cm wide, welded to the main frame to form a single, circular structure.

[0091] Each individual brush, or shield-tail wire brush assembly, consists of a wire brush, a shield-tail brush base, and shield-tail brush side panels. The shield-tail brush side panels are divided into a first shield-tail brush side panel and a second shield-tail brush side panel, each of which is connected to the shield-tail brush base. The wire brush is located between the two panels and is also connected to the shield-tail brush base. This structure ensures that the wire brush is securely fixed between the shield-tail brush base and the two side panels, forming a stable, sealed unit.

[0092] The injection device is a key component of this system. It is used to inject foaming agent into the wire brush located between the first and second shield tail brush side plates. The foaming agent is injected from the base of the shield tail brush to the wire brush between the two side plates. Once injected, the foaming agent forms a layer of foaming agent reaction medium on the wire brush. After the chemical reaction is complete, this layer forms a high-density sponge-like substance that fills the gaps between the wire brushes, thereby improving sealing performance.

[0093] It is worth noting that the wire brush is only located between the first and second shield tail brush side plates, which means that the foaming agent will only react and form a dielectric layer in this area. This design ensures that the foaming agent can act precisely on the area that needs to be sealed, avoiding material waste and unnecessary chemical reactions.

[0094] In summary, the technical principle of this invention is to achieve efficient and precise sealing of the shield tail of the shield machine through a carefully designed annular wire brush layer and a corresponding liquid injection device. This sealing system not only improves the safety and efficiency of shield construction, but also reduces maintenance costs and material consumption.

[0095] Specifically, the present invention provides a shield tail brush sealing system, further comprising:

[0096] The shield tail main frame 101 is configured as a multi-layer frame structure, which includes a steel plate brush installation reserved layer structure, a grease bin structure, and a wire shield tail brush installation reserved layer structure;

[0097] The steel plate brush installation reserved layer structure is used to install the annular steel plate brush layer 103, one end of the annular steel plate brush layer 103 is located on the side of the steel plate brush installation reserved layer structure, and the other end of the annular steel plate brush layer 103 is facing the outside of the annular segment pushed out after the shield machine segment assembly machine is assembled;

[0098] The reserved layer structure for installing the wire shield tail brush is used to install the annular shield tail wire brush layer 102. One end of the annular shield tail wire brush layer 102 is located on the side of the reserved layer structure for installing the wire shield tail brush, and the other end of the annular shield tail wire brush layer 102 faces the outer side of the annular segment pushed out after the shield machine segment assembly machine is assembled.

[0099] The grease bin structure is used to inject liquid grease into the grease bin structure through a fixed oil pressure pump, and the oil pressure in the grease bin structure is monitored at any time through a detection device.

[0100] The grease chamber is filled with liquid grease by a fixed hydraulic pump. At the same time, the oil pressure in the grease chamber is monitored at any time by a detection device.

[0101] Grease bin structure. The foaming agent is injected into the inside of the shield tail wire brush, and there is no separate structure setting on the main frame of the shield tail brush.

[0102] Specifically, the shield tail brush sealing system provided by the present invention achieves efficient and reliable sealing of the shield tail of the shield machine through a series of sophisticated designs and structural arrangements. The following is a detailed technical description of several key parts of the system:

[0103] Multi-layer frame structure: The shield tail's main frame is designed as a multi-layer structure, which not only enhances the frame's stability but also facilitates the installation of various sealing components. The multi-layer frame structure includes a reserved layer for steel plate brushes, a grease bin, and a reserved layer for wire brushes at the shield tail. These reserved layers enable precise positioning during installation of the annular steel plate brush layer and the annular wire brush layer at the shield tail, ensuring that the sealing components fit tightly against the shield tail, thereby enhancing the sealing effect.

[0104] The two layers of sealing brushes, the annular steel plate brush layer and the annular shield tail wire brush layer, are crucial components of the system. They are installed on the steel plate brush installation layer and the wire shield tail brush installation layer, respectively. One end is attached to the main shield tail frame, while the other is directed toward the outside of the annular segments pushed out by the shield machine segment assembly machine. This double-layer design increases the level of sealing and reliability, with each layer effectively blocking the intrusion of external impurities such as mud and groundwater.

[0105] Grease Bin Structure: Located within the main shield tail frame, the grease bin is filled with liquid grease via a stationary hydraulic pump. This design serves two purposes: first, the lubricating properties of the grease reduce friction between the shield tail brushes and the segments, extending the brush life; and second, the grease's sealing properties further enhance the shield tail's sealing effectiveness. The system is also equipped with detection equipment to monitor the oil pressure within the grease bin at all times, ensuring a continuous and stable grease supply.

[0106] Foaming agent injection technology: The foaming agent is injected into the annular shield tail wire brush layer. After injection, it reacts and foams rapidly, forming a dense and elastic overall structure. This structure fills the gaps between the shield tail brushes and improves sealing performance. Notably, the foaming agent is not separately installed on the shield tail brush frame, but acts directly on the shield tail brush, which saves space and improves efficiency.

[0107] In summary, the shield tail brush sealing system of the present invention achieves efficient and reliable sealing of the shield tail of a shield machine by integrating multiple techniques, including a multi-layer frame structure, a double-layer sealing brush design, a grease bin structure, and a foaming agent injection technique. This invention not only improves the safety and efficiency of shield construction, but also reduces maintenance costs and material consumption.

[0108] Specifically, the present invention provides a shield tail brush sealing system, further comprising:

[0109] The grease bin structure is filled with liquid grease by the liquid injection device, and the liquid grease contacts the wire brush 2001. The liquid grease is used to seal the gap between the shield tail brush and the pipe segment.

[0110] The annular steel plate brush layer 103 includes uniformly distributed steel plate brushes for blocking sand and gravel;

[0111] The foaming agent reaction medium layer on the wire brush 2001 is between the bristles of the wire brush.

[0112] Specifically, the shield tail brush sealing system provided by the present invention has been carefully designed and optimized in terms of technology and structure to ensure the sealing and durability of the shield tail of the shield machine. The following is a further detailed description of the system:

[0113] Grease bunker structure and liquid grease: The grease bunker is designed to store and inject liquid grease via an injection device. Once injected, this liquid grease comes into contact with the wire brush 2001, effectively sealing any tiny gaps that may exist between the shield tail brush and the segments. Liquid grease possesses excellent fluidity and sealing properties, effectively filling these gaps and preventing impurities such as groundwater and mud from seeping into the shield machine, thereby ensuring safe shield construction.

[0114] Annular Steel Plate Brush Layer and Steel Plate Brushes: Steel plate brushes are evenly distributed across the annular steel plate brush layer 103. Their primary function is to block external sand and gravel. During shield machine advancement, the steel plate brushes first contact the ground's sand and gravel, trapping them outside the machine and preventing them from abrading and damaging the tail brushes and the machine interior. This design not only extends the service life of the tail brushes but also improves shield construction efficiency.

[0115] Wire Brush and Foaming Agent Reaction Medium Layer: Wire Brush 2001 is a key component in the shield tail brush sealing system. In this invention, a foaming agent is injected into the wire brush via an injection device. The foaming agent reacts between the bristles of the wire brush to form a dense and elastic medium layer. This medium not only enhances the sealing performance of the wire brush but also improves its pressure resistance and water-stopping capabilities. The medium formed after the foaming agent reacts resembles a high-density sponge, effectively filling the gaps between the wire brushes and preventing the infiltration of external impurities.

[0116] In summary, the shield tail brush sealing system of the present invention achieves efficient and comprehensive sealing of the shield tail of a shield machine through multiple technical means, including liquid grease sealing in the grease bin structure, sand and gravel blocking in the annular steel plate brush layer, and enhanced sealing between the wire brush and the foaming agent reaction medium layer. This system design not only improves the sealing and safety of shield construction, but also extends the service life of the shield tail brush and reduces maintenance costs.

[0117] Specifically, the present invention provides a shield tail brush sealing system, further comprising:

[0118] After the foaming agent is injected through the injection device, it solidifies and foams between the steel brushes 2001 on the annular shield tail steel brush layer 102 to form a foaming agent reaction medium layer, so that all the steel brushes 2001 on the annular shield tail steel brush layer 102 form a dense and elastic overall structure, which is used to improve the sealing and pressure resistance of the annular shield tail steel brush layer 102 to external groundwater, concrete slurry and sand and gravel.

[0119] The use of a foaming agent in the shield tail brush sealing system provided by the present invention is a key innovation. The following is a detailed description of the role and technical principles of the foaming agent in this system:

[0120] The foaming agent is precisely injected between the wire brushes 2001 on the annular shield tail wire brush layer 102 through a liquid injection device. After injection, the foaming agent rapidly solidifies and foams between the wire brushes, forming a layer of foaming agent reaction medium. This medium layer is not only dense but also elastic, thus forming a unified structure for the previously dispersed wire brushes 2001.

[0121] This integrated structure significantly improves the sealing and pressure resistance of the annular shield tail wire brush layer 102 against external groundwater, concrete slurry, and sand and gravel. Specifically, the foaming agent reaction medium layer fills the gaps between the wire brushes, preventing external impurities from penetrating into the shield machine through these gaps. Furthermore, the elasticity of the foaming agent layer absorbs and disperses external pressure, thereby enhancing the shield tail brush's pressure resistance.

[0122] Furthermore, the choice of foaming agent was carefully considered. The foaming agent used in this invention exhibits excellent chemical stability and durability, enabling it to maintain its sealing and compressive properties over the long term during shield machine construction. This foaming agent also exhibits excellent water and corrosion resistance, maintaining stable performance in humid and corrosive environments.

[0123] In summary, by injecting a foaming agent through a liquid injection device and forming a foaming agent reaction medium layer between the wire brushes 2001 on the annular shield tail wire brush layer 102, the present invention achieves efficient, long-term, and stable sealing of the shield tail. This sealing system not only improves the safety and efficiency of shield construction, but also extends the service life of the shield tail brushes and reduces maintenance costs.

[0124] Specifically, the present invention provides a shield tail brush sealing system, further comprising:

[0125] The foaming agent is injected into the spaces between the bristles of the wire brush through a handheld injection device before the shield machine starts excavation;

[0126] The liquid grease in the grease chamber is injected into the device through a fixed hydraulic pump.

[0127] The liquid grease in the grease chamber is injected into the grease bin structure through a fixed hydraulic pump.

[0128] Specifically, the shield tail brush sealing system provided by the present invention further refines the injection method of the foaming agent and liquid grease. The following is a related description:

[0129] Foaming agent injection: Before the shield machine begins tunneling, the foaming agent is injected between the bristles of the wire brush using a handheld injection device. This injection method ensures that the foaming agent is evenly and accurately distributed throughout the wire brush, laying the foundation for subsequent foaming to form a dense and elastic overall structure. The use of the handheld injection device improves operational flexibility and accuracy, making the foaming agent injection more controllable and efficient.

[0130] Liquid Grease Injection: The liquid grease in the grease chamber is injected into the grease chamber structure via a fixed hydraulic pump injection device. This injection method provides a continuous and stable supply of liquid grease to the grease chamber, ensuring that the gap between the shield tail brush and the segment is continuously and effectively sealed. The fixed hydraulic pump injection device not only provides stable oil pressure but also allows for adjustment of the grease injection volume and speed according to actual needs, thereby meeting the sealing requirements of the shield machine under different construction conditions.

[0131] In summary, the present invention achieves efficient and precise sealing of the shield tail brush by injecting a foaming agent in one go using a handheld injection device and injecting liquid grease using a fixed hydraulic pump. This sealing system not only improves the safety and efficiency of shield construction, but also extends the service life of the shield tail brush and reduces maintenance costs. Furthermore, the system can flexibly adjust the injection amount and method of the sealing material according to different construction conditions, demonstrating its high practicality and adaptability.

[0132] Specifically, the present invention provides a shield tail brush sealing system, further comprising:

[0133] After the liquid injection device uniformly injects the foaming agent into the annular shield tail wire brush layer 102 , the outer side of the annular shield tail wire brush layer 102 is covered with a sealing layer.

[0134] Specifically, the present invention provides a shield tail brush sealing system, further comprising:

[0135] The sealing layer is configured as a high-strength plastic protective tape, and the plastic sheet is covered during the construction phase of injecting the foaming agent into the wire brush 2001, and is used to bind the foaming agent between the wire brushes 2001, thereby preventing the foaming agent from leaking out of the wire brush 2001 during the chemical reaction and foaming expansion process;

[0136] The foaming agent is injected before assembling the shield tail, and the part of the shield tail joint that has not been injected with foaming agent is replenished before the shield machine starts excavation;

[0137] The shield tail has been assembled on the shield machine, and the foaming agent is injected at the construction site before the shield machine starts excavation.

[0138] Specifically, the present invention provides a shield tail brush sealing system, wherein the foaming agent of the injection device is AB liquid, and the foaming agent reaction medium layer is formed by injecting the foaming agent into the area between the two annular shield tail wire brush layers 102 through the injection device;

[0139] The position of the AB liquid in the gap of the wire brush 2001 is from the root of the bristles of the wire brush 2001 to the top of the bristles. The AB liquid includes liquid A and liquid B. When liquid A and liquid B are injected, the foam generated by the rapid chemical reaction fills the gap on each steel wire of the wire brush 2001 and forms a foaming agent reaction medium layer. The foaming agent reaction medium layer is an elastic layer with long-term stability and density.

[0140] The present invention provides a shield tail brush sealing system. Existing grease filling and smearing methods for shield machine tail seals require operators to manually organize the grease into lumps and then press the lumps into the wire mesh. If the operator applies too much force when pressing the lumps into the wire mesh, the shield brush bristles can easily break. If the operator applies too little force, the grease cannot penetrate deep into the shield brush bristles. The hard grease is difficult to fill deeply into the shield tail brush bristles, resulting in uneven smearing of the shield brush bristles, posing a safety hazard to water and grout leakage. Concrete can also seep into the wire brush, causing it to clump and solidify. Grouting slurry seeps into the wire, solidifying it and causing it to lose its elasticity and become damaged.

[0141] The technical solution of the present application generates foams through a rapid chemical reaction when liquids A and B are injected, which fill the gaps between the steel wires of the shield tail brush and form an integrated dense structure with long-term stable elasticity. The dense structure with long-term stability and rich elasticity formed by the chemical reaction improves the pressure resistance and water-stopping properties of the shield tail brush, and provides an effective guarantee for the long-term stable operation of the shield machine. A special wrapping protective film device is introduced to prevent the foaming agent from overflowing during the injection process, ensuring that the foaming agent is fully foamed between the steel wires without flowing to the outside. Through the injection and chemical reaction of the foaming agent, an integrated dense structure with better elasticity is formed, which improves the pressure resistance and water-stopping properties of the shield tail brush. The injection of the foaming agent makes the steel wire of the shield tail brush denser, greatly improves the wear resistance, effectively prevents wire drawing, and extends the service life. After the foaming agent is injected, the shield tail brush is not easily damaged, effectively avoiding the safety hazards caused by water leakage and slurry intrusion, and can achieve long-term construction over long distances without replacing the shield tail brush.

[0142] The technical principle of this invention primarily involves injecting a specially designed foaming agent between the steel wires of the shield tail brush. Once mixed with the AB liquid and injected, this foaming agent rapidly undergoes a chemical reaction and foams, forming a dense and elastic overall structure. This structure significantly improves the shield tail brush's sealing performance, more effectively blocking the intrusion of external groundwater, concrete slurry, and sand and gravel. It also enhances the shield tail brush's resistance to pressure, corrosion, and wear, significantly extending its service life. Furthermore, the injection of liquid grease further ensures the sealing of the gap between the shield tail brush and the pipe segment, while also providing lubrication and protection for the wire brush.

[0143] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as covering the preferred embodiments and all changes and modifications that fall within the scope of the invention. The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A shield tail brush sealing system, characterized in that: It comprises a shield tail sealing device (1) and a liquid injection device used in conjunction with the shield tail sealing device (1); The shield tail sealing device (1) comprises a shield tail main body frame (101), an annular shield tail wire brush layer (102) and an annular steel plate brush layer (103); the shield tail main body frame (101) is provided with a wire brush installation area and a steel plate brush installation area; The steel plate brush installation area is located at the edge of the end of the shield tail main body frame (101), and the steel plate brush installation area is used to install the annular steel plate brush layer (103); The shield tail main body frame (101) is provided with a slurry stop plate (105) on the side of the annular steel plate brush layer (103); The wire brush installation area is located in the middle of the shield tail main body frame (101), and a grease bin (104) is provided between the wire brush installation area and the steel plate brush installation area. The wire brush installation area is used to install the annular shield tail wire brush layer (102); The annular shield tail steel wire brush layer (102) on the shield tail main body frame (101) is arranged in an interval manner, and the annular shield tail steel wire brush layer (102) arranged in an interval manner is at least two layers; The annular shield tail wire brush layer (102) includes a wire brush and a steel plate brush, both of which are single brushes with a width of about 15-20 cm, which are welded on the main frame to form an overall annular shield tail wire brush layer (102). The shield tail wire brush device (201) includes a wire brush (2001), a shield tail brush base (2002) and a shield tail brush side plate (2003); The shield tail brush side plate (2003) comprises a first shield tail brush side plate and a second shield tail brush side plate, the shield tail brush base (2002) is connected to the first shield tail brush side plate and the second shield tail brush side plate respectively, and the wire brush (2001) is located between the first shield tail brush side plate and the second shield tail brush side plate, and is connected to the shield tail brush base (2002); The liquid injection device is used to inject a foaming agent into the wire brush (2001) located between the first shield tail brush side plate and the second shield tail brush side plate. The foaming agent is injected into an area ranging from the shield tail brush base (2002) to the wire brush (2001) between the first shield tail brush side plate and the second shield tail brush side plate. The foaming agent is injected onto the wire brush (2001) to form a foaming agent reaction medium layer.

2. The system according to claim 1, wherein Also includes; The shield tail main body frame (101) is configured as a multi-layer frame structure, which includes a steel plate brush installation reserved layer structure, a grease bin structure, and a steel wire shield tail brush installation reserved layer structure; The steel plate brush installation reserved layer structure is used to install the annular steel plate brush layer (103), one end of the annular steel plate brush layer (103) is located on the side of the steel plate brush installation reserved layer structure, and the other end of the annular steel plate brush layer (103) is toward the outside of the annular segment pushed out after the shield machine segment assembly machine is assembled; The wire shield tail brush installation reserved layer structure is used to install an annular shield tail wire brush layer (102), one end of the annular shield tail wire brush layer (102) is located on the side of the wire shield tail brush installation reserved layer structure, and the other end of the annular shield tail wire brush layer (102) is toward the outside of the annular segment pushed out after the shield machine segment assembly machine is assembled; The grease bin structure is used to inject liquid grease into the grease bin structure through a fixed oil pressure pump, and the oil pressure in the grease bin structure is monitored at any time through a detection device.

3. The system according to claim 2, wherein: Also includes; The grease bin structure is filled with liquid grease injected by the liquid injection device, and the liquid grease contacts the wire brush (2001). The liquid grease is used to seal the gap between the shield tail brush and the pipe segment. The annular steel plate brush layer (103) includes uniformly distributed steel plate brushes for blocking sand and gravel; The foaming agent reaction medium layer on the wire brush (2001) is between the bristles of the wire brush.

4. The system according to claim 3, wherein: Also includes; After being injected through the liquid injection device, the foaming agent solidifies and foams between the steel brushes (2001) on the annular shield tail steel brush layer (102) to form a foaming agent reaction medium layer, so that all the steel brushes (2001) on the annular shield tail steel brush layer (102) form a dense and elastic overall structure, which is used to improve the sealing and pressure resistance of the annular shield tail steel brush layer (102) to external groundwater, concrete slurry and sand and gravel.

5. The system according to claim 4, wherein: Also includes; The foaming agent is injected into the spaces between the bristles of the wire brush through a handheld injection device before the shield machine starts excavation; The liquid grease in the grease chamber is injected into the device through a fixed hydraulic pump. The liquid grease in the grease chamber is injected into the grease bin structure through a fixed hydraulic pump.

6. The system according to claim 5, wherein: Also includes; After the liquid injection device uniformly injects the foaming agent into the annular shield tail steel wire brush layer (102), the outer side of the annular shield tail steel wire brush layer (102) is covered with a sealing layer.

7. The system according to claim 6, wherein: Also includes; The sealing layer is configured as a high-strength plastic protective tape, and the plastic sheet is covered during the construction phase of injecting the foaming agent into the wire brush (2001), and is used to bind the foaming agent between the wire brushes (2001), thereby preventing the foaming agent from leaking outside the wire brush (2001) during the process of chemical reaction and foaming expansion; The foaming agent is injected before assembling the shield tail, and the part of the shield tail joint that has not been injected with foaming agent is replenished before the shield machine starts excavation; The shield tail has been assembled on the shield machine, and the foaming agent is injected at the construction site before the shield machine starts excavation.

8. The system according to claim 7, wherein: Also includes; The foaming agent of the liquid injection device is AB liquid, and the foaming agent reaction medium layer is formed by injecting the foaming agent into the area between the two annular shield tail wire brush layers (102) through the liquid injection device; The position of the AB liquid in the gap of the wire brush (2001) is from the root of the bristles of the wire brush (2001) to the top of the bristles. The AB liquid includes liquid A and liquid B. When liquid A and liquid B are injected, the foam generated by the rapid chemical reaction fills the gap on each steel wire of the wire brush (2001) and forms a foaming agent reaction medium layer. The foaming agent reaction medium layer is an elastic layer with long-term stability and density.

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