Shield tail brush sealing system

Abstract

The invention belongs to the technical field of shield construction, and provides a shield tail brush sealing system, the sealing performance of a traditional shield tail brush filled with grease is improved through a specially designed foaming agent for sealing, the service life of the shield tail brush is prolonged while the sealing performance is greatly 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, meanwhile, grease leakage is reduced, and the construction cost is saved. The foaming agent specially researched and developed is liquid and can ensure that the liquid A and the liquid B quickly generate chemical reaction and then foam after flowing into any corner of a shield tail brush steel wire and staying at the position for a certain time, and all spaces of a shield tail brush can be instantly filled with foam; the shield tail brush immediately and organically forms an elastic integral structure which is dense and rich in rubber, so that the shield tail brush is more pressure-resistant, corrosion-resistant and consolidation-resistant, and the shield tail brush injected with the foaming agent forms a rubber seal, so that the performances such as water stop and the like are 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] The shield machine is a tunnel boring machine that uses the shield method. Its basic working principle is that a cylindrical steel component excavates the soil while advancing along the axis of the tunnel. It is an engineering operation equipment that integrates excavation, soil discharge, and lining. It is mainly composed of a cutter head, a shield, a propulsion system, a slag discharge system, and a segment assembly machine.

[0003] The main functions of the shield machine include underground tunnel excavation, tunnel support and maintenance. It can achieve efficient and rapid tunnel excavation and has a certain degree of environmental protection advantages. While excavating the underground tunnel, the shield machine can ensure the safety and stability of the tunnel by setting up a support structure. After the shield machine completes the excavation in the underground tunnel project, it is necessary to maintain the underground project, such as sealing the water leakage of the subway tunnel.

[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 in the tunnel and the shield machine is large in size, replacing the shield brush in the tunnel and sealing the water leakage in the tunnel involve extremely high accident risks and capital investment.

[0005] The use scenario targeted by the technical solution of this application is the shield tail seal of the shield machine. The shield tail seal of the shield machine is a key link in the construction process of the shield machine. During the excavation process of the shield machine, the shield tail seal can effectively block the entry of mud, water, sand and slurry, and prevent the soil layer from entering the working space of the shield machine from the tail, thereby avoiding damage to mechanical equipment and workers. The shield tail seal can also play a role in sealing groundwater. In underground tunnel excavation, groundwater will penetrate into the excavation space through the soil layer. An effective shield tail seal can prevent groundwater from entering the tail of the shield machine, ensure the normal operation of the shield machine, and prevent the occurrence of safety accidents. In order to improve the sealing effect, the shield tail is usually designed with multiple seals. For example, three seals are designed between the tail shield and the middle shield, including 2-3 wire brush lip seals and a steel plate shield tail brush seal. Grease is used to fill the seals, which not only lubricates but also enhances the sealing effect. The steel plate shield tail brush is made of elastic steel plate, which can effectively prevent mud and sand from entering the shield body. To ensure the effectiveness of the shield tail seal, it is difficult to see the shield tail brush during excavation, and it is difficult to check the wear unless a leak occurs. Leakage can be checked indirectly by observing the rate of loss of liquid grease in the grease chamber and whether water has penetrated into the shield machine.

[0006] Although some measures have been taken in the traditional shield tail brush during the excavation process, there are still a series of problems. For example, the traditional method is to press hand-applied grease into the gap between the wires of the shield tail brush through tools such as metal crowbars before the shield machine starts excavation. Note that the paste-like hand-applied grease pressed between the wire brushes. The grease cavity is injected with fluid grease. The fluid grease in the grease cavity is replenished at any time during excavation. Since the shield tail grease cannot penetrate well into the inside of the shield tail wire, the sealing effect is affected, the slurry invades the shield tail, and even the shield tail brush is penetrated, etc., causing the shield machine to have to be shut down for maintenance or even replacement during construction, which not only increases maintenance costs and reduces construction efficiency, but more importantly, increases construction safety risks, which may seriously lead to personal and tunnel safety. Therefore, seeking a more advanced and reliable shield tail brush sealing system has become an urgent need for the current development of shield machine technology. Summary of the invention

[0007] The purpose of the present invention is to provide a shield tail brush sealing system to solve the problem that during the manufacturing process of a shield machine, grease is applied by hand and pressed between the steel wires of the shield tail brush to maintain the sealing state of the shield tail brush. However, due to the gaps between the steel wires, it is difficult to ensure that the grease is evenly applied to every corner by the traditional grease injection method.

[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 comprises a shield tail main body frame 101, an annular shield tail wire brush layer 102 and an annular steel plate brush layer 103, wherein the shield tail main body 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, 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;

[0013] 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;

[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 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 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 faces the outer side 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 injects liquid grease into the grease bin structure through a fixed hydraulic pump, and at the same time, 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 injected with liquid grease by the injection device, and the liquid grease contacts the wire brush 2001. The liquid grease is used to seal the small gap 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 compression 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 at one time 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 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 cloth is covered during the construction stage of injecting the foaming agent into the wire brush 2001, and is used to bind the foaming agent between the wire brushes 2001 to prevent 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 the foaming agent is supplemented 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 digging.

[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 region 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 a long-term stable and dense elastic layer.

[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 the traditional shield tail brush sealing system and improve the performance and construction efficiency of the shield tail brush. The following are the main beneficial effects brought by the technical solution of the present invention:

[0041] Improved full sealing performance: By introducing an injected foaming agent, the chemical reaction forms an integrated dense structure, which effectively improves the sealing performance of the shield tail brush. This full sealing performance can prevent 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: The 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 replacement frequency of the shield tail brush, 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 the safety of construction.

[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 work efficiency of the shield tail brush.

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

[0046] Environmental friendliness: The shield tail brush sealing system uses chemical foaming agents. After grease is injected into the grease cavity, the sealing performance of the shield tail brush is improved, which can significantly reduce the loss of grease in the grease cavity and reduce pollution to the environment. In addition, the formation of a dense structure helps prevent mud and slurry from invading the interior of the shield machine.

[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 period of time during construction, ensuring the feasibility of long-term and long-distance excavation.

[0048] Reduce construction costs: If the traditional shield tail brush is damaged, in order to ensure construction safety during construction, a large amount of shield tail grease must be continuously injected to resist external pressure, resulting in grease loss. The new sealing system shield tail brush is not easily damaged, which can reduce grease consumption and construction costs.

[0049] Acid-resistant, alkali-resistant and flame-retardant functions: In order to meet the needs of manufacturing, construction and dismantling, the foam formed by mixing 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 briefly introduces 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 creative work.

[0051] Figure 1 A partial structural schematic diagram 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. 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] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The technical solutions provided by the embodiments of the present invention are described in detail below in conjunction with the drawings.

[0060] The shield tail brush sealing system provided by the present invention is a comprehensive solution, which aims to improve the sealing performance of the shield tail of the 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] Shield tail sealing device: It is composed of the shield tail main frame, the annular shield tail wire brush layer and the annular steel plate brush layer. Among them, the shield tail main frame is provided with a wire brush installation area and a steel plate brush installation area. The wire brush installation area is located in the middle, and adopts an annular shield tail wire brush layer arranged in intervals, at least two layers, to improve the redundancy and reliability of the seal. The steel plate brush installation area is located at the end edge of the shield tail main frame, which is used to install the annular steel plate brush layer to further enhance the blocking ability of impurities such as sand and gravel.

[0063] Liquid injection device: used to inject liquid grease and foaming agent into the shield tail brush sealing system. 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 to improve 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 the foaming agent between the wire brushes, it solidifies and foams between the wire brushes to form a dense and elastic overall structure. This not only improves the sealing performance, but also enhances the pressure resistance and wear resistance of the shield tail brush and prolongs 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 play a role in lubricating and protecting the wire brush from rust and damage.

[0068] Easy to maintain and replace: The shield tail brush sealing system is reasonably designed, which is convenient for maintenance and replacement of 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, liquid grease injection and other means, which 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 fail to solve the problem of wear and corrosion of the shield tail brush during long-term use, but the shield tail brush sealing system provided by the present invention solves this problem by using a foaming agent. By injecting a foaming agent between the wire brushes, a new structure that is both dense and elastic is formed, which not only significantly improves the pressure resistance and wear resistance of the shield tail brush, but also prolongs 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 the tightness of the seal. At the same time, the lubricating effect of grease can effectively protect the wire brush from rust and damage, further extending the service life of the equipment.

[0073] In actual application, the shield tail brush sealing system has demonstrated superior performance and effect. In multiple shield construction projects, the shield tail brush sealing system has successfully blocked the intrusion of external impurities and ensured the smooth progress of construction. At the same time, due to its excellent wear resistance and pressure resistance, the shield tail brush can still maintain a good working condition after long-term use, reducing maintenance costs and replacement frequency. This not only improves construction efficiency, but also provides a strong guarantee for the economic benefits and safety of the project.

[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 comprises a shield tail main body frame 101, an annular shield tail wire brush layer 102 and an annular steel plate brush layer 103, wherein the shield tail main body 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, 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;

[0079] The present invention mainly comprises a shield tail sealing device and a liquid injection device used in combination therewith. The shield tail sealing device is the core part of the system, which is composed of a shield tail main body frame, an annular shield tail wire brush layer and an annular steel plate brush layer. This structural design aims to improve the sealing performance through multiple sealing layers.

[0080] First, the shield tail main frame is provided with a wire brush installation area and a steel plate brush installation area. These two areas are used to install the annular shield tail wire brush layer and the annular steel plate brush layer, respectively, to form a double-layer sealing structure. Among them, the annular steel plate brush layer is located at the end edge of the shield tail main frame, and its main function is to initially block external impurities such as groundwater and mud. The annular shield tail wire brush layer is located in the middle of the shield tail main frame, forming a second sealing line of defense, further improving 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. At the same time, a grease bin is set between the wire brush installation area and the steel plate brush installation area. This grease bin is used to store liquid grease so that it can be injected into the gap between the shield tail brush and the pipe segment through the injection device when necessary to enhance the sealing effect.

[0082] The liquid injection device is another important component of the present invention. It is mainly used to inject liquid grease and specially designed foaming agent into the shield tail brush sealing system. The liquid grease can ensure that the gap between the shield tail brush and the pipe segment is tightly sealed, and at the same time play a lubricating role to protect the shield tail brush from damage. The foaming agent is a special chemical material that will quickly produce a chemical reaction and foam after injection to form a dense and elastic overall structure. This structure can fill the gaps between the shield tail brushes, further improve the sealing performance, and enhance the pressure resistance, corrosion resistance and wear resistance of the shield tail brush.

[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 interval manner, and the annular shield tail steel wire brush layer 102 arranged in an interval 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 the 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 shield tail brush side plate and the second shield tail brush side plate. The foaming agent is injected into the area 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. After the foaming agent completes the chemical reaction, the medium formed is similar to a high-density sponge, and the wire brush 2001 only exists 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 of the annular shield tail wire brush layer and its working mode, as well as how the liquid injection device cooperates with it to improve the sealing effect. The following is a detailed description of the technical principle of the present invention:

[0090] The ring-shaped shield tail wire brush layer on the main frame of the shield tail is arranged in intervals and includes at least two layers. This design increases the redundancy and reliability of the seal. Even if a layer of wire brushes has problems, the other layers can still provide effective sealing. Each layer of the ring-shaped shield tail wire brush layer is composed of multiple single brushes, which are about 15-20 cm wide and are welded to the main frame to form an overall ring structure.

[0091] Each single brush, i.e., the shield tail wire brush device, includes a wire brush, a shield tail brush base, and a shield tail brush side plate. The shield tail brush side plate is divided into a first shield tail brush side plate and a second shield tail brush side plate, which are respectively connected to the shield tail brush base, and the wire brush is located between the two and connected to the shield tail brush base. This structure enables the wire brush to be firmly fixed between the shield tail brush base and the two side plates to form a stable sealing unit.

[0092] The injection device is a key part of this system. It is used to inject foaming agent into the wire brush 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 ranges from the shield tail brush base to the wire brush between the two side plates. When the foaming agent is injected, it will form a layer of foaming agent reaction medium on the wire brush. After the chemical reaction is completed, this layer of medium will form a substance similar to a high-density sponge, which fills the gap in the wire brush, thereby improving the sealing performance.

[0093] It is worth noting that the wire brush only exists 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 the present invention is to achieve efficient and accurate sealing of the shield tail of the shield machine through a finely designed annular shield tail wire brush layer and a matching 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 faces the outer side 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 injects liquid grease into the grease bin structure through a fixed hydraulic pump, and at the same time, the oil pressure in the grease bin structure is monitored at any time through a detection device.

[0100] The grease chamber is used to inject liquid grease into the chamber through a fixed hydraulic pump. At the same time, the oil pressure in the grease chamber is monitored at any time through the detection equipment.

[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 realizes 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 principle description of several key parts of the system:

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

[0104] Annular steel plate brush layer and annular shield tail wire brush layer: These two layers of sealing brushes are important components of the system. They are installed on the reserved layer structure for steel plate brush installation and the reserved layer structure for wire shield tail brush installation respectively, with one end close to the main frame of the shield tail and the other end facing the outside of the annular segment pushed out by the shield machine segment assembly machine. This double-layer brush design increases the level and reliability of the seal, and each layer can effectively block the intrusion of external impurities such as mud and groundwater.

[0105] Grease bin structure: The grease bin structure is located inside the main frame of the shield tail, and liquid grease is injected into the bin through a fixed hydraulic pump. This design has two functions: first, the lubricity of grease is used to reduce the friction between the shield tail brush and the pipe segment, thus extending the service life of the shield tail brush; second, the sealing effect of the shield tail is further enhanced through the sealing property of grease. At the same time, the system is also equipped with detection equipment to monitor the oil pressure in the grease bin at any time to ensure that the grease can be supplied continuously and stably.

[0106] Foaming agent injection technology: The foaming agent is injected into the annular shield tail wire brush layer. After injection, it will react and foam quickly to form a dense and elastic overall structure. This structure can fill the gaps between the shield tail brushes and improve the sealing performance. It is worth noting that the foaming agent does not have a separate structural setting on the main frame of the shield tail brush, but directly acts on the inside of the shield tail brush, which saves space and improves efficiency.

[0107] In summary, the shield tail brush sealing system of the present invention realizes efficient and reliable sealing of the shield tail of the shield machine through the comprehensive use of multiple means such as multi-layer frame structure, double-layer sealing brush design, grease bin structure and foaming agent injection technology. The present 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 injected with liquid grease by the 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 bin structure and liquid grease: The grease bin structure is designed to store and inject liquid grease through a liquid injection device. This liquid grease contacts the wire brush 2001 after injection, and its important function is to seal the tiny gaps that may exist between the shield tail brush and the segment. Liquid grease has good fluidity and sealing properties, and can effectively fill these gaps to prevent impurities such as groundwater and mud from penetrating into the shield machine through these gaps, thereby ensuring the safe conduct of shield construction.

[0114] Annular steel plate brush layer and steel plate brush: Steel plate brushes are evenly distributed on the annular steel plate brush layer 103. The main function of these steel plate brushes is to block external sand and gravel. During the advancement of the shield machine, the steel plate brushes can first contact the sand and gravel of the stratum and block them outside the shield machine to prevent the sand and gravel from causing wear and damage to the shield tail brush and the inside of the shield machine. This design not only extends the service life of the shield tail brush, but also improves the efficiency of shield construction.

[0115] Wire brush and foaming agent reaction medium layer: Wire brush 2001 is one of the key components in the shield tail brush sealing system. In the present invention, the foaming agent is injected into the wire brush through the liquid injection device, and the foaming agent reacts between the bristles of the wire brush to form a dense and elastic medium layer. This layer of medium not only enhances the sealing performance of the wire brush, but also improves its pressure resistance and water-stopping ability. The medium formed after the foaming agent reacts is similar to a high-density sponge, which can effectively fill the gaps between the wire brushes and prevent external impurities from penetrating through these gaps.

[0116] In summary, the shield tail brush sealing system of the present invention realizes efficient and comprehensive sealing of the shield tail of the shield machine through multiple technical means such as liquid grease sealing of the grease bin structure, sand and stone blocking of the annular steel plate brush layer, and enhanced sealing of 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 prolongs 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 compression resistance of the annular shield tail steel brush layer 102 to external groundwater, concrete slurry and sand and gravel.

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

[0120] The foaming agent is accurately injected into the spaces between the steel brushes 2001 on the annular shield tail steel brush layer 102 through the liquid injection device. After injection, the foaming agent quickly solidifies and foams between the steel brushes to form a foaming agent reaction medium layer. This medium layer is not only dense but also elastic, so that the originally dispersed steel brushes 2001 form an integral structure.

[0121] This overall structure significantly improves the sealing and compression resistance of the annular shield tail wire brush layer 102 to 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. At the same time, since the medium layer formed by the foaming agent is elastic, it can absorb and disperse external pressure, thereby enhancing the compression resistance of the shield tail brush.

[0122] In addition, the selection of the foaming agent is also carefully considered. The foaming agent used in the present invention has good chemical reaction stability and durability, and can maintain its sealing and compression resistance for a long time during the shield machine construction process. This foaming agent also has good water resistance and corrosion resistance, and can maintain stable performance in a humid and corrosive environment.

[0123] In summary, the foaming agent is injected through the liquid injection device, and a foaming agent reaction medium layer is formed between the wire brushes 2001 on the annular shield tail wire brush layer 102, and the present invention realizes efficient, long-term and stable sealing of the shield tail of the shield machine. This sealing system not only improves the safety and efficiency of shield construction, but also prolongs the service life of the shield tail brush 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 at one time 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 the liquid grease. The following is a related description:

[0129] Injection of foaming agent: Before the shield machine starts excavation, the foaming agent is injected into the bristles of the wire brush at one time through a handheld injection device. This injection method ensures that the foaming agent can be evenly and accurately distributed in the wire brush, laying the foundation for subsequent foaming to form a dense and elastic overall structure. The use of a handheld injection device improves the flexibility and accuracy of the operation, making the injection of the foaming agent more controllable and efficient.

[0130] Injection of liquid grease: The liquid grease in the grease cavity is injected into the grease bin structure through a fixed hydraulic pump injection device. This injection method can continuously and stably provide liquid grease to the grease bin, ensuring that the gap between the shield tail brush and the pipe segment is continuously and effectively sealed. The fixed hydraulic pump injection device not only provides stable oil pressure, but also can adjust the injection amount and injection speed of grease according to actual needs, thereby meeting the sealing requirements of the shield machine under different construction conditions.

[0131] In summary, the present invention realizes efficient and precise sealing of the shield tail brush by injecting the foaming agent once through a handheld injection device and injecting liquid grease through 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. At the same time, the system can also flexibly adjust the injection amount and injection method of the sealing material according to different construction conditions, and has high practicality and adaptability.

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

[0133] After the 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 cloth is covered during the construction stage of injecting the foaming agent into the wire brush 2001, and is used to bind the foaming agent between the wire brushes 2001 to prevent 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 the foaming agent is supplemented 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 digging.

[0138] Specifically, the present invention provides a shield tail brush sealing system, wherein 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 region between the two annular shield tail wire brush layers 102 through the liquid 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 a long-term stable and dense elastic layer.

[0140] The present invention provides a shield tail brush sealing system. The existing shield machine tail seal grease filling requires operators to manually organize the grease into blocks, and then the operators press the block grease into the wire mesh. If the operator presses the block grease into the wire mesh too hard, it is easy to cause the shield brush wire bristles to break. If the operator presses the block grease into the wire mesh too lightly, it is easy to cause the grease to fail to enter the deep of the shield brush wire bristles. The grease is very hard and difficult to fill into the deep of the shield tail brush wire bristles, resulting in uneven smearing of the shield brush wire bristles, leaving safety hazards for water leakage and slurry leakage. Concrete will also penetrate into the wire brush, causing the wire brush to clump and solidify. Since the grouting slurry penetrates into the steel wire, the wire brush solidifies, causing it to lose elasticity and be damaged.

[0141] The liquids A and B of the technical solution of the present application generate foams through rapid chemical reactions when 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 chemical reactions improves the pressure resistance and water-stopping properties of the shield tail brush, providing effective protection 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 prolongs 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-distance and long-term construction without replacing the shield tail brush.

[0142] The technical principle of the present invention is mainly to inject a specially designed foaming agent between the steel wires of the shield tail brush. After the foaming agent is mixed with the AB liquid and injected, it will quickly produce a chemical reaction and foam to form a dense and elastic overall structure. This structure significantly improves the sealing performance of the shield tail brush and more effectively blocks the invasion of external groundwater, concrete slurry and sand and gravel. At the same time, it also enhances the pressure resistance, corrosion resistance and wear resistance of the shield tail brush, thereby greatly extending the service life of the shield tail brush. In addition, by injecting liquid grease, the sealing of the gap between the shield tail brush and the pipe segment is further ensured, while providing lubrication and protecting the wire brush.

[0143] Although the 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 are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in 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 the area 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, characterized in that 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) faces the outer side 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) faces the outer side of the annular segment pushed out after the shield machine segment assembly machine is assembled; The grease bin structure injects liquid grease into the grease bin structure through a fixed hydraulic pump, and at the same time, the oil pressure in the grease bin structure is monitored at any time through a detection device.

3. The system according to claim 2, characterized in that Also includes; The grease bin structure is filled with liquid grease injected by the injection device, the liquid grease contacts the wire brush (2001), and 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, characterized in that Also includes; After being injected through the 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, characterized in that Also includes; The foaming agent is injected into the spaces between the bristles of the wire brush at one time 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, characterized in that 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, characterized in that Also includes; The sealing layer is configured as a high-strength plastic protective tape, and the plastic cloth is covered during the construction phase of injecting the foaming agent into the steel wire brush (2001), and is used to bind the foaming agent between the steel wire brushes (2001) to prevent the foaming agent from leaking out of the steel 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 the foaming agent is supplemented 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 digging.

8. The system according to claim 7, characterized in that 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.

Images