Composite shield tail sealing brush with synchronous filling of sealing grease for shield and shield tail sealing method

Abstract

The invention discloses a composite shield tail sealing brush for synchronously filling sealing grease for shield construction and a shield tail sealing method. The shield tail sealing brush comprises an A-type sealing brush and a B-type sealing brush. The A-type sealing brush is used as the first row of sealing brushes, and the B-type sealing brush is used as the subsequent sealing brush. Both the A-type sealing brush and the B-type sealing brush comprise a bottom plate and a fixed pressing plate. The elastic steel plate and the steel wire group are fixed between the fixed pressing plate and the bottom plate by pins. The inner cavity of the shield tail brush is communicated with an inner grease inlet channel. The inner grease inlet channel connects the steel plate gap of the front steel plate bundle, and the inner grease inlet channel connects the steel plate gap of the rear steel plate bundle. An outer grease inlet channel is arranged on the bottom plate of the A-type sealing brush. The outer grease inlet channel is communicated with the inner cavity of the shield tail brush. A grease inlet hole is arranged on the fixed pressing plate of the B-type sealing brush, and a movable pressing plate is arranged in the inner cavity of the shield tail brush. The movable pressing plate can cover the entire grease inlet hole, and a spring is arranged between the movable pressing plate and the clamping plate. The invention improves the pressing force of the shield tail sealing brush, enhances the sealing effect of the shield tail brush, and reduces the probability of failure of the shield tail brush.

Description

Technical Field

[0001] The invention relates to a shield sealing system, in particular to a composite shield tail sealing brush for synchronously filling sealing grease for a shield and a shield tail sealing method. Background Art

[0002] The shield method is widely used in tunnel construction due to its advantages of safety, reliability, speed, economy and environmental protection. Earth pressure balance shields and slurry balance shields are increasingly used to pass through important buildings (structures), such as cables, high-speed railways, rivers and lakes. The shield tail seal, one of the three main sealing systems of the shield, prevents the soil and sand of the surrounding strata, groundwater and the filling slurry behind the segments from flowing from the segments and the shield tail to the inside of the shield tunnel during the shield excavation process. In particular, when the shield tail seal fails when the shield passes through a river or soft soil stratum, it may cause great economic losses and major safety accidents. The shield tail seal structure has increasingly attracted research and discussion among shield constructors.

[0003] The shield tail seal is usually welded with three or four rows of shield tail brushes on the inner diameter of the circular steel plate at the shield tail. Each row of shield tail brushes is composed of several shield tail brushes to form a circle of shield tail brushes. The ends of the shield tail brushes are squeezed on the outer surface of the pipe segment. The shield tail brushes are filled with shield tail sealing grease before the shield starts. Two or three sealing cavities are formed inside the shield tail, between the shield tail brush and the outer surface of the pipe segment. As the shield moves forward, the sealing cavity is filled with shield tail sealing grease in real time to prevent external soil, sand, groundwater, etc. from entering the shield tunnel. The commonly used shield tail brushes nowadays mainly include wire brushes, steel plate bundles, and composite shield tail brushes with wire brushes and steel plate bundles. However, due to the unreasonable design of the shield tail brush structure and the fact that the inside of the shield tail brush is easily corroded by the synchronous slurry, the shield tail brush seal often fails during the shield construction process, which in turn causes the shield tail to leak slurry and water, which is prone to safety accidents. Therefore, it is urgent to design a shield tail brush with a reasonable structure to minimize the probability of shield tail brush failure and ensure the safety of shield construction. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a composite shield tail sealing brush and a shield tail sealing method for synchronously filling sealing grease for a shield machine. The shield tail sealing brush is composed of a steel plate bundle and a steel wire group. With the injection of the shield tail sealing grease, the sealing grease can enter the internal gap of each shield tail brush or sealing brush and fill it up, thereby reducing the probability of failure of the shield tail brush.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] Composite shield tail sealing brushes with synchronous filling of sealing grease for shield, including type A sealing brushes and type B sealing brushes. Type A sealing brushes are used as the first row of sealing brushes, and type B sealing brushes are used as subsequent sealing brushes (the second row and subsequent sealing brushes are called subsequent sealing brushes);

[0007] A-type sealing brush:

[0008] It includes a bottom plate and a fixed pressing plate, an elastic steel plate and a steel wire group are arranged between the bottom plate and the fixed pressing plate, the elastic steel plate includes a front steel plate bundle and a rear steel plate bundle, the front steel plate bundle includes a front inner steel plate and a front outer steel plate, the rear steel plate bundle includes a rear inner steel plate and a rear outer steel plate, the front steel plate bundle is arranged at the front side of the steel wire group, and the rear steel plate bundle is arranged at the rear side of the steel wire group;

[0009] The steel wire group is formed by folding a plurality of steel wires in half, and the folding part is fixed by a clamping plate; the elastic steel plate and the steel wire group are fixed between the fixed pressing plate and the bottom plate by pins; the shield tail brush inner cavity is formed between the ends of the elastic steel plate and the steel wire group, the bottom plate and the fixed pressing plate;

[0010] The splint is located in the inner cavity of the shield tail brush, the front inner steel plate is composed of at least one steel plate, the rear inner steel plate is composed of at least one steel plate, the front inner steel plate and the rear inner steel plate are provided with inner fat inlet channels, the inner cavity of the shield tail brush is connected with the inner fat inlet channels; the inner fat inlet channels are connected to the steel plate gaps of the front steel plate bundle, and the inner fat inlet channels are connected to the steel plate gaps of the rear steel plate bundle;

[0011] An external grease inlet channel is arranged on the bottom plate; the external grease inlet channel is connected with the inner cavity of the shield tail brush;

[0012] B-type sealing brush:

[0013] It includes a bottom plate and a fixed pressing plate, an elastic steel plate and a steel wire group are arranged between the bottom plate and the fixed pressing plate, the elastic steel plate includes a front steel plate bundle and a rear steel plate bundle, the front steel plate bundle includes a front inner steel plate and a front outer steel plate, the rear steel plate bundle includes a rear inner steel plate and a rear outer steel plate, the front steel plate bundle is arranged at the front side of the steel wire group, and the rear steel plate bundle is arranged at the rear side of the steel wire group;

[0014] The steel wire group is formed by folding a plurality of steel wires in half, and the folding part is fixed by a clamping plate; the elastic steel plate and the steel wire group are fixed between the fixed pressing plate and the bottom plate by pins; the shield tail brush inner cavity is formed between the ends of the elastic steel plate and the steel wire group, the bottom plate and the fixed pressing plate;

[0015] The splint is located in the inner cavity of the shield tail brush, the front inner steel plate is composed of at least one steel plate, the rear inner steel plate is composed of at least one steel plate, the front inner steel plate and the rear inner steel plate are provided with inner fat inlet channels, the inner cavity of the shield tail brush is connected with the inner fat inlet channels; the inner fat inlet channels are connected to the steel plate gaps of the front steel plate bundle, and the inner fat inlet channels are connected to the steel plate gaps of the rear steel plate bundle;

[0016] A grease inlet hole is arranged on the fixed pressing plate, a movable pressing plate is arranged in the inner cavity of the shield tail brush, the movable pressing plate can cover the entire grease inlet hole, and a spring is arranged between the movable pressing plate and the clamping plate.

[0017] As a preferred embodiment, at least two rows of B-type sealing brushes are provided as subsequent sealing brushes, a sealing cavity is formed between the first row of B-type sealing brushes and the A-type sealing brushes, and a sealing cavity is formed between two adjacent rows of B-type sealing brushes.

[0018] As a preferred embodiment, the ends of the elastic steel plate and the steel wire group are flush.

[0019] As a preferred embodiment, the installation parts of the elastic steel plate and the steel wire group are overlapped to form a whole having at least one bend.

[0020] As a preferred embodiment, the inner fat inlet channel extends from the head end to the tail end of the front inner steel plate and the rear inner steel plate, and the extension length of the inner fat inlet channel exceeds the bending part of the front inner steel plate and the rear inner steel plate.

[0021] As a preferred embodiment, the end of the bottom plate extends out of the bending part of the elastic steel plate and the steel wire group as a whole.

[0022] As a preferred embodiment, the A-type sealing brush is installed behind the shield tail boss, and the B-type sealing brush is installed behind the shield tail mounting seat.

[0023] Shield tail sealing method for synchronous filling of sealing grease for shield machine:

[0024] Before the shield starts: the ends of the A-type sealing brush and the B-type sealing brush are squeezed on the outer surface of the segment, all sealing cavities are filled with shield tail sealing grease, and the A-type sealing brush and the B-type sealing brush are filled with shield tail sealing grease;

[0025] As the shield advances forward, sealing grease is injected into the sealing cavity simultaneously. Under the action of the sealing grease pressure, the spring force of the B-type sealing brush becomes shorter, the movable pressure plate is squeezed open, and the sealing grease enters the gaps between the rear outer steel plate, the rear inner steel plate, the steel wire group, the front inner steel plate, and the front outer steel plate through the grease inlet hole, the inner cavity of the shield tail brush, and the internal grease inlet channel, filling the gaps fully.

[0026] As a preferred method, when the shield tail gap becomes larger, the volume of the sealing brush gap will become larger, and the sealing grease will fill the enlarged gap; when the shield tail gap becomes smaller, the gap volume will become smaller, and the sealing grease in the gap will be squeezed out of the gap; no matter whether the shield tail gap becomes larger or smaller, the sealing grease in the gap is full.

[0027] As a preferred method, the composite shield tail sealing brush cooperates with the slurry baffle plate for sealing. The slurry baffle plate is arranged at the end of the shield tail or behind the last B-type sealing brush to prevent the slurry behind the shield tail from flowing forward, thereby achieving the effect of auxiliary sealing.

[0028] The beneficial effects of the present invention are as follows: the shield tail brush (A-type sealing brush and B-type sealing brush) is composed of a steel plate bundle and a steel wire group, which improves the pressing force of the shield tail sealing brush and enhances the sealing effect of the shield tail brush. As the shield advances, the sealing grease in the sealing cavity is injected through the grease inlet channel on each shield tail brush and fills the gaps between the steel plates, steel plates and steel wires, and steel wires in the shield tail brush, thereby reducing the probability of failure of the shield tail brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a schematic diagram of the shield tail brush under unstressed conditions;

[0031] Figure 2 This is a schematic diagram of the shield tail brush under the condition of minimum shield tail clearance;

[0032] Figure 3 This is a schematic diagram of the shield tail brush under the condition of maximum shield tail clearance;

[0033] Figure 4 This is one of the schematic diagrams of the A-type sealing brush structure;

[0034] Figure 5 This is the second schematic diagram of the A-type sealing brush structure;

[0035] Figure 6 This is one of the schematic diagrams of the B-type sealing brush structure;

[0036] Figure 7 This is the second schematic diagram of the B-type sealing brush structure;

[0037] Figure 8 This is the third schematic diagram of the B-type sealing brush structure;

[0038] Fig. 9 This is a partial schematic diagram of the B-type sealing brush;

[0039] Fig.10 It is a schematic diagram of the structure of the anterior medial steel plate or the posterior medial steel plate.

[0040] In the figure, 1-shield tail, 2-type A sealing brush, 3-sealing cavity, 4-first type B sealing brush, 5-second type B sealing brush, 6-slurry baffle, 7-pipe segment, 8-rear outer steel plate, 9-rear inner steel plate, 10-wire group, 11-front inner steel plate, 12-front outer steel plate, 13-bottom plate A, 14-pin, 15-fixed pressure plate, 16-clamp, 17-shield tail brush inner cavity, 18-external grease inlet channel, 19-movable pressure plate, 20-grease inlet hole, 21-spring, 22-bottom plate B, 23-internal grease inlet channel, 24-gap, 25-winding axis, 26-guide rod. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, if a first feature exists above or below a second feature, it may include that the first and second features are in direct contact, or it may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is above, above and above the second feature, including that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. If the first feature exists below, below and below the second feature, it includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] Embodiment 1

[0047] like Figure 1-Figure 3As shown, the shield tail composite sealing brush with synchronous filling of sealing grease includes type A sealing brush 2 and type B sealing brush. Type A sealing brush 2 is used as the first row sealing brush, and type B sealing brush is used as the subsequent sealing brush (the second row and subsequent sealing brushes are called subsequent sealing brushes); Figure 1-Figure 3 The two rows of sealing brushes arranged at the back are respectively the first B-type sealing brush 4 and the second B-type sealing brush 5.

[0048] A-type sealing brush 2 (see Figure 4 , Figure 5 ):

[0049] Including base plate (see Figure 4 A bottom plate A13) and a fixed pressing plate 15, an elastic steel plate and a steel wire group 10 are arranged between the bottom plate and the fixed pressing plate 15, the elastic steel plate includes a front steel plate bundle and a rear steel plate bundle, the front steel plate bundle includes a front inner steel plate 11 and a front outer steel plate 12, the rear steel plate bundle includes a rear inner steel plate 9 and a rear outer steel plate 8, the front steel plate bundle is arranged at the front side of the steel wire group 10, and the rear steel plate bundle is arranged at the rear side of the steel wire group 10;

[0050] The steel wire group 10 is formed by folding a plurality of steel wires in half, and the folded portion is fixed by a clamping plate 16; the elastic steel plate and the steel wire group 10 are fixed between a fixed pressing plate 15 and a bottom plate by pins 14; a shield tail brush inner cavity 17 is formed between the ends of the elastic steel plate and the steel wire group 10, the bottom plate and the fixed pressing plate 15;

[0051] The clamping plate 16 is located in the inner cavity 17 of the shield tail brush. The front inner steel plate 11 is composed of at least one steel plate, and the rear inner steel plate 9 is composed of at least one steel plate. The front inner steel plate 11 and the rear inner steel plate 9 are provided with an inner fat inlet channel 23. The inner cavity 17 of the shield tail brush is connected with the inner fat inlet channel 23. The inner fat inlet channel 23 is connected to the steel plate gap of the front steel plate bundle, and the inner fat inlet channel 23 is connected to the steel plate gap of the rear steel plate bundle.

[0052] An external fat inlet channel 18 is provided on the bottom plate; the external fat inlet channel 18 is communicated with the inner cavity 17 of the shield tail brush;

[0053] B-type sealing brush (see Figure 6-Figure 9 ):

[0054] Including base plate (see Figure 6 A bottom plate B22) and a fixed pressing plate 15, an elastic steel plate and a steel wire group 10 are arranged between the bottom plate and the fixed pressing plate 15, the elastic steel plate includes a front steel plate bundle and a rear steel plate bundle, the front steel plate bundle includes a front inner steel plate 11 and a front outer steel plate 12, the rear steel plate bundle includes a rear inner steel plate 9 and a rear outer steel plate 8, the front steel plate bundle is arranged at the front side of the steel wire group 10, and the rear steel plate bundle is arranged at the rear side of the steel wire group 10;

[0055] The steel wire group 10 is formed by folding a plurality of steel wires in half, and the folded portion is fixed by a clamping plate 16; the elastic steel plate and the steel wire group 10 are fixed between a fixed pressing plate 15 and a bottom plate by pins 14; a shield tail brush inner cavity 17 is formed between the ends of the elastic steel plate and the steel wire group 10, the bottom plate and the fixed pressing plate 15;

[0056] The clamping plate 16 is located in the inner cavity 17 of the shield tail brush. The front inner steel plate 11 is composed of at least one steel plate, and the rear inner steel plate 9 is composed of at least one steel plate. The front inner steel plate 11 and the rear inner steel plate 9 are provided with an inner fat inlet channel 23. The inner cavity 17 of the shield tail brush is connected with the inner fat inlet channel 23. The inner fat inlet channel 23 is connected to the steel plate gap of the front steel plate bundle, and the inner fat inlet channel 23 is connected to the steel plate gap of the rear steel plate bundle.

[0057] A grease inlet hole 20 is arranged on the fixed pressing plate 15 , a movable pressing plate 19 is arranged in the inner cavity 17 of the shield tail brush, the movable pressing plate 19 can cover the entire grease inlet hole 20 , and a spring 21 is arranged between the movable pressing plate 19 and the clamping plate 16 .

[0058] In this embodiment, two types of sealing brushes or shield tail brushes are provided, and sealing is achieved through the joint action of type A sealing brush 2 and type B sealing brush. The sealing grease in type A sealing brush 2 and type B sealing brush mainly comes from sealing cavity 3 during the construction process. Type A sealing brush 2, multiple rows of type B sealing brushes and multiple sealing cavities 3 are sealed layer by layer, and the sealing effect is better.

[0059] B-type sealing brush, Figure 6-Figure 9 It can represent a B-type sealing brush. This type of shield tail brush needs to rely on the sealing cavity 3 and the grease inlet hole 20 for grease inlet.

[0060] The B-type sealing brush is provided with a movable pressing plate 19, and the movable pressing plate 19 can cover the grease inlet hole 20 to prevent the sealing grease or other substances from flowing back or back, thus playing an anti-backflow effect, further enhancing the stability of the seal, and further enhancing the sealing effect. Since the A-type sealing brush 2 can only enter the grease inlet channel 18, the B-type sealing brush adopts a one-way valve structure, the key point is to prevent the slurry from entering the front sealing cavity 3 through the shield tail brush after the rear sealing cavity 3 fails.

[0061] like Figure 1-Figure 3 An embodiment of the joint operation of a B-type sealing brush and an A-type sealing brush 2 is given. An A-type sealing brush 2 is arranged at the front end of the shield tail 1, and subsequent shield tail brushes are arranged as B-type sealing brushes. Sealing grease can enter the A-type sealing brush 2 and the B-type sealing brush through the sealing cavity 3.

[0062] Embodiment 2

[0063] In order to obtain a better sealing effect, at least two sealing cavities 3 are set, that is, at least two rows of B-type sealing brushes are set for subsequent sealing brushes, a sealing cavity 3 is formed between the first row of B-type sealing brushes and the A-type sealing brush 2, and a sealing cavity 3 is formed between two adjacent rows of B-type sealing brushes.

[0064] Embodiment 3

[0065] The ends of the elastic steel plate and the steel wire group 10 are flush. There are maximum and minimum shield tail gaps between the shield tail and the pipe segment 7 in different states. No matter what shield tail gap each steel plate and the steel wire end are in, they can be squeezed on the outer surface of the pipe segment 7 to improve the shield tail brush sealing effect.

[0066] The distance between the shield tail boss and the outer surface of the tube segment 7 is called the shield tail gap. The shield tail gap is generally at the minimum shield tail gap (such as Figure 2 ) and maximum shield tail clearance (such as Figure 3 ), such as Figure 1 Each steel plate and each steel wire end in the shield tail brush can be pressed against the outer surface of the tube segment 7 regardless of the shield tail gap between the tube segment 7 and the shield tail 1, thereby enhancing the sealing effect of the shield tail brush.

[0067] Embodiment 4

[0068] The installation parts of the elastic steel plate and the steel wire group 10 are overlapped to form a whole with at least one bend. The inner fat inlet channel 23 extends from the head end to the end of the front inner steel plate 11 and the rear inner steel plate 9, and the extension length of the inner fat inlet channel 23 exceeds the bend of the front inner steel plate 11 and the rear inner steel plate 9 (if there are multiple bends, it must exceed the first bend). This setting can further ensure the fat inlet efficiency and fat inlet effect.

[0069] The inner fat inlet channel 23 is projected onto the horizontal plane to form a U shape, such as Fig.10 As shown, this type of arrangement, on the one hand, does not directly hinder the flow of the sealing grease, which facilitates the entry of the grease, and on the other hand, facilitates the molding of the internal grease entry channel 23.

[0070] Embodiment 5

[0071] In order to make the connection between the bottom plate and the shield tail 1 more stable, the end of the bottom plate extends out of the bending part of the elastic steel plate and the steel wire group 10 as a whole.

[0072] Embodiment 6

[0073] In order to lock the elastic steel plate and the steel wire assembly 10 , at least one row of pins 14 are provided to fix the elastic steel plate and the steel wire assembly 10 , and at least five pins 14 are provided in one row.

[0074] Embodiment 7

[0075] The A-type sealing brush 2 is installed behind the shield tail boss, and the B-type sealing brush is installed behind the shield tail mounting seat. The bottom plate of the A-type sealing brush 2 is welded to the shield tail boss and the inner wall of the shield tail, and the bottom plate of the B-type sealing brush is welded to the shield tail mounting seat and the inner wall of the shield tail.

[0076] Furthermore, a right-angle mounting position is formed between the shield tail boss and the inner wall of the shield tail, and a right-angle mounting position is formed between the shield tail mounting seat and the inner wall of the shield tail; the bottom plate of the A-type sealing brush 2 includes a first mounting plate and a second mounting plate, the first mounting plate and the second mounting plate are 90° apart, the first mounting plate is welded to the shield tail boss, and the second mounting plate is welded to the inner wall of the shield tail; the bottom plate of the B-type sealing brush includes a third mounting plate and a fourth mounting plate, the third mounting plate and the fourth mounting plate are 90° apart, the third mounting plate is welded to the shield tail mounting seat, and the fourth mounting plate is welded to the inner wall of the shield tail.

[0077] like Figure 1-Figure 3 , three rows of shield tail brushes (sealing brushes) are welded on the inner diameter of the shield tail 1 of the shield machine, and each row of shield tail brushes is composed of multiple shield tail brushes. The pipe segment 7 is assembled in the shield tail 1 in front of the shield tail brush. As the shield advances, the shield tail 1 moves forward, and the pipe segment 7 does not move. Two sealing cavities 3 are formed between the inner diameter of the shield tail, the shield tail brush and the outer surface of the pipe segment 7, and the sealing cavity 3 is filled with the sealing grease of the shield tail 1. As the shield advances forward, a small amount of sealing grease in the sealing cavity 3 will be retained on the outer surface of the pipe segment 7. The sealing grease is injected into the sealing cavity 3 synchronously to fill the lost sealing grease and ensure that the sealing cavity 3 is fully filled. A slurry baffle 6 is set behind the shield tail brush to prevent the synchronous slurry behind the shield tail 1 from flowing forward.

[0078] Embodiment 8

[0079] The guide rod 26 is fixed on the clamping plate 16 of the B-type sealing brush, and the spring 21 is sleeved outside the guide rod 26. When the spring 21 is not under force, the end of the spring 21 and the end of the guide rod 26 have a spacing of 1-3 mm.

[0080] The guide rod 26 is provided to prevent the spring 21 from deflecting. In addition, when the B-type sealing brush is not used, the movable pressing plate 19 can also cover the grease inlet hole 20 to prevent impurities from entering the B-type sealing brush.

[0081] Embodiment 9

[0082] Shield tail sealing method for synchronous filling of sealing grease for shield machine:

[0083] Before the shield starts: the ends of the A-type sealing brush 2 and the B-type sealing brush are squeezed on the outer surface of the segment 7, all the sealing cavities 3 are filled with the shield tail 1 sealing grease, and the A-type sealing brush 2 and the B-type sealing brush are filled with the shield tail 1 sealing grease;

[0084] As the shield advances forward, sealing grease is injected into all sealing cavities 3 simultaneously. Under the action of the sealing grease pressure, the spring 21 of the B-type sealing brush is forced to shorten, the movable pressure plate 19 is squeezed open, and the sealing grease enters the gaps 24 between the rear outer steel plate 8, the rear inner steel plate 9, the steel wire group 10, the front inner steel plate 11, and the front outer steel plate 12 through the grease inlet hole 20, the shield tail brush inner cavity 17, and the inner grease inlet channel 23, filling the gaps 24 completely.

[0085] Under the action of sealing grease pressure, the sealing grease in the sealing cavity 3 enters into the gaps 24 between the rear outer steel plate 8, the rear inner steel plate 9, the steel wire group 10, the front inner steel plate 11, and the front outer steel plate 12 through the external grease inlet channel 18 of the A-type sealing brush, the inner cavity 17 of the shield tail brush, and the internal grease inlet channel 23, filling the gaps 24 completely.

[0086] When the shield tail gap becomes larger, the volume of the gap 24 will become larger, and the sealing grease will fill the enlarged gap 24; when the shield tail gap becomes smaller, the volume of the gap 24 will become smaller, and the sealing grease in the gap 24 will be squeezed out of the gap 24; no matter whether the shield tail gap becomes larger or smaller, the sealing grease in the gap 24 is full.

[0087] The composite shield tail sealing brush cooperates with the slurry baffle plate 6 for sealing. The slurry baffle plate 6 is arranged at the end of the shield tail 1 or behind the last B-type sealing brush to prevent the synchronous slurry behind the shield tail 1 from flowing forward, thereby playing an auxiliary sealing effect.

[0088] The present invention designs a composite shield tail sealing brush in which a steel plate bundle and a steel wire group 10 work together. The shield tail brush is welded and fixed on the inner diameter of the shield tail 1 steel plate in sequence to form a three- or four-row annular sealing structure. Two or three sealing cavities 3 are formed between the shield tail brush, the shield tail 1 and the outer surface of the pipe segment 7. During the shield tunneling process, the sealing cavity 3 is filled with the shield tail 1 sealing grease in real time. The shield tail brush (sealing brush) is composed of a front steel plate bundle, a rear steel plate bundle and a steel wire group 10. The steel wire group 10 is located between the front steel plate bundle and the rear steel plate bundle. According to the maximum and minimum shield tail gaps between the shield tail 1 and the pipe segment 7, the length and bending radius of each steel plate and steel wire can make each steel plate and the end of the steel wire squeeze on the outer surface of the pipe segment 7 regardless of the shield tail gap, thereby ensuring the sealing effect of the shield tail brush. A sealing grease inlet channel is designed between each shield tail brush and the sealing cavity 3. As the shield advances, the pneumatic grease injection pump synchronously injects sealing grease into the sealing cavity 3 and fills the sealing cavity 3. At the same time, due to the effect of the grease injection pressure, the sealing grease in the sealing cavity 3 is injected into the gaps 24 between the steel plates and steel plates, the steel plates and steel wires, and the steel wires in the shield tail brush through the grease inlet channel on the shield tail brush, and fills the gaps in real time, thereby enhancing the supporting force of the shield tail brush, preventing slurry, water and other debris that have invaded the end of the shield tail brush from entering the inside of the shield tail brush, and reducing the probability of failure of the shield tail brush.

[0089] Embodiment 10

[0090] The distance between the shield tail boss and the outer surface of the segment 7 is called the shield tail gap, which is generally 30 mm. In order to prevent the outer surface of the segment 7 from interfering with the shield tail 1, the size of the shield tail gap should be controlled by selecting the segment 7. The shield tail gap is generally at the minimum shield tail gap (such as Figure 2 ) and maximum shield tail clearance (such as Figure 3 ) between. In order to ensure that the end of the shield tail brush presses the outer surface of the pipe segment 7, the elastic steel plate of the designed shield tail brush must have a certain curvature. The state of the shield tail brush under unpressurized conditions is as follows Figure 1 The shield tail brush should be designed according to the size of the shield tail 1 and the pipe segment 7. The size of each component of the shield tail brush should be designed to ensure that the steel plate and steel wire at the end of the shield tail brush are pressed tightly against the outer surface of the pipe segment 7 when the shield tail gap is the minimum, and there is no gap between the steel plates and the steel wires. As the shield tail gap increases, the steel plate and steel wire at the end of the shield tail brush are pressed tightly against the outer surface of the pipe segment 7, but the gaps 24 between the steel plates, between the steel plates and steel wires, and between the steel wires are getting larger.

[0091] The A-type shield tail brush (also known as the A-type sealing brush 2) is composed of a rear steel plate bundle, a steel wire group 10, a front steel plate bundle, a bottom plate, a pin 14, a pressure plate, a clamping plate 16 and other components. The rear steel plate bundle is composed of a rear outer steel plate 8 and a rear inner steel plate 9, and the rear inner steel plate 9 is composed of multiple steel plates. Except for the different lengths of the steel plates and the sizes of the inner grease inlet channel 23, the other structural dimensions are the same. The front steel plate bundle is composed of a front outer steel plate 12 and a front inner steel plate 11, and the front inner steel plate 11 is composed of multiple steel plates. Except for the different lengths of the steel plates and the sizes of the inner grease inlet channel 23, the other structural dimensions are the same. The steel wire group 10 is formed by folding a plurality of steel wires, which are fixed at the fold by a clamping plate 16, and a winding shaft 25 is set at the fold of the steel wire to prevent the steel wire in the shield tail brush from being pulled out of the shield tail brush. An external grease inlet channel 18 is designed on the bottom plate A13. The front inner steel plate 11 and the front inner steel plate 11 are designed with an inner fat inlet channel 23, and the length of the inner fat inlet channel 23 must exceed the bending part of the steel plate.

[0092] The installation process of the A-type shield tail brush is as follows: the rear outer steel plate 8, the rear inner steel plate 9, the steel wire group 10, the front inner steel plate 11, the front outer steel plate 12, and the fixed pressure plate 15 are installed on the bottom plate A13 in sequence, and finally fixed with a plurality of pins 14.

[0093] The process of automatic filling of sealing grease with the A-type shield tail brush is as follows: As the shield advances forward, sealing grease is synchronously injected into the sealing cavity 3. Under the action of the sealing grease pressure, the sealing grease enters the gaps 24 between the rear outer steel plate 8, the rear inner steel plate 9, the steel wire group 10, the front inner steel plate 11, and the front outer steel plate 12 through the external grease inlet channel 18, the shield tail brush inner cavity 17, and the internal grease inlet channel 23, filling the gaps 24 and also playing a supporting role. When the shield tail gap becomes larger, the volume of the gap 24 will become larger, and the sealing grease fills the enlarged gap 24. When the shield tail gap becomes smaller, the volume of the gap 24 will become smaller, and the sealing grease in the gap 24 will squeeze out of the gap 24. Regardless of whether the shield tail gap becomes larger or smaller, the sealing grease in the gap 24 is full.

[0094] The B-type shield tail brush (also known as the B-type sealing brush) is composed of a rear steel plate bundle, a steel wire group 10, a front steel plate bundle, a bottom plate, a pin 14, a pressure plate B, a clamping plate 16, a movable pressure plate 19, a spring 21 and other components. The rear steel plate bundle is composed of a rear outer steel plate 8 and a rear inner steel plate 9, and the rear inner steel plate 9 is composed of multiple steel plates. Except for the different lengths of the steel plates and the sizes of the inner fat inlet channel 23, the other structural dimensions are the same. The front steel plate bundle is composed of a front outer steel plate 12 and a front inner steel plate 11, and the front inner steel plate 11 is composed of multiple steel plates. Except for the different lengths of the steel plates and the sizes of the inner fat inlet channel 23, the other structural dimensions are the same. The steel wire group 10 is formed by folding a plurality of steel wires, which are fixed at the fold by a clamping plate 16, and a winding shaft 25 is set at the fold of the steel wire to prevent the shield tail brush or the steel wire in the shield tail brush from being pulled out of the shield tail brush. The rear inner steel plate 9 and the front inner steel plate 11 are designed with an inner fat inlet channel 23, the length of which should exceed the bending part of the steel plate. One end of the spring 21 is fixed to the movable pressing plate 19 (circular pressing plate), and the other end is fixed to the clamping plate 16. Due to the elastic force of the spring 21, the circular pressing plate is pressed tightly around the fat inlet hole 20 designed on the pressing plate B.

[0095] The installation process of the B-type sealing brush is as follows: the rear outer steel plate 8, the rear inner steel plate 9, the steel wire group 10, the front inner steel plate 11, the front outer steel plate 12, the spring 21, the movable pressure plate 19, and the pressure plate B are installed on the bottom plate B22 in sequence, and finally fixed with several pins 14.

[0096] As the shield advances forward, sealing grease is injected into all sealing cavities 3 simultaneously. Under the pressure of the sealing grease, the spring 21 is shortened, the movable pressure plate 19 is pressed open, and the sealing grease enters the gaps 24 between the rear outer steel plate 8, the rear inner steel plate 9, the steel wire group 10, the front inner steel plate 11, and the front outer steel plate 12 through the grease inlet hole 20, the inner cavity 17 of the shield tail brush, and the inner grease inlet channel 23, filling the gaps 24. When the gap at the shield tail becomes larger, the volume of the gap 24 will become larger, and the sealing grease will fill the enlarged gap 24. When the gap at the shield tail becomes smaller, the volume of the gap 24 will become smaller, and the sealing grease in the gap 24 will squeeze out of the gap 24. Regardless of whether the gap at the shield tail becomes larger or smaller, the sealing grease in the gap 24 is full.

[0097] Since the grease of the A-type sealing brush 2 can only enter from the external grease inlet channel 18, the B-type sealing brush adopts a one-way valve structure, the focus is to prevent the slurry from entering the front sealing cavity 3 through the shield tail brush after the rear sealing cavity fails.

[0098] No matter the shield tail brushes are three rows, four rows or more, only the first row of shield tail brushes (A-type sealing brushes 2) has a different structural design, and the structures of the other shield tail brushes (B-type sealing brushes) are the same.

[0099] 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. Composite shield tail sealing brush with synchronous filling of sealing grease for shield, characterized by: Including A-type sealing brush and B-type sealing brush. A-type sealing brush is used as the first row sealing brush, and B-type sealing brush is used as the subsequent sealing brush. A-type sealing brush: It includes a bottom plate and a fixed pressing plate, an elastic steel plate and a steel wire group are arranged between the bottom plate and the fixed pressing plate, the elastic steel plate includes a front steel plate bundle and a rear steel plate bundle, the front steel plate bundle includes a front inner steel plate and a front outer steel plate, the rear steel plate bundle includes a rear inner steel plate and a rear outer steel plate, the front steel plate bundle is arranged at the front side of the steel wire group, and the rear steel plate bundle is arranged at the rear side of the steel wire group; The steel wire group is formed by folding a plurality of steel wires in half, and the folding part is fixed by a clamping plate; the elastic steel plate and the steel wire group are fixed between the fixed pressing plate and the bottom plate by pins; the shield tail brush inner cavity is formed between the ends of the elastic steel plate and the steel wire group, the bottom plate and the fixed pressing plate; The splint is located in the inner cavity of the shield tail brush, the front inner steel plate is composed of at least one steel plate, the rear inner steel plate is composed of at least one steel plate, the front inner steel plate and the rear inner steel plate are provided with inner fat inlet channels, the inner cavity of the shield tail brush is connected with the inner fat inlet channels; the inner fat inlet channels are connected to the steel plate gaps of the front steel plate bundle, and the inner fat inlet channels are connected to the steel plate gaps of the rear steel plate bundle; An external grease inlet channel is arranged on the bottom plate; the external grease inlet channel is connected with the inner cavity of the shield tail brush; B-type sealing brush: It includes a bottom plate and a fixed pressing plate, an elastic steel plate and a steel wire group are arranged between the bottom plate and the fixed pressing plate, the elastic steel plate includes a front steel plate bundle and a rear steel plate bundle, the front steel plate bundle includes a front inner steel plate and a front outer steel plate, the rear steel plate bundle includes a rear inner steel plate and a rear outer steel plate, the front steel plate bundle is arranged at the front side of the steel wire group, and the rear steel plate bundle is arranged at the rear side of the steel wire group; The steel wire group is formed by folding a plurality of steel wires in half, and the folding part is fixed by a clamping plate; the elastic steel plate and the steel wire group are fixed between the fixed pressing plate and the bottom plate by pins; the shield tail brush inner cavity is formed between the ends of the elastic steel plate and the steel wire group, the bottom plate and the fixed pressing plate; The splint is located in the inner cavity of the shield tail brush, the front inner steel plate is composed of at least one steel plate, the rear inner steel plate is composed of at least one steel plate, the front inner steel plate and the rear inner steel plate are provided with inner fat inlet channels, the inner cavity of the shield tail brush is connected with the inner fat inlet channels; the inner fat inlet channels are connected to the steel plate gaps of the front steel plate bundle, and the inner fat inlet channels are connected to the steel plate gaps of the rear steel plate bundle; A grease inlet hole is arranged on the fixed pressing plate, a movable pressing plate is arranged in the inner cavity of the shield tail brush, the movable pressing plate can cover the entire grease inlet hole, and a spring is arranged between the movable pressing plate and the clamping plate; The subsequent sealing brushes are provided with at least two rows of B-type sealing brushes, a sealing cavity is formed between the first row of B-type sealing brushes and the A-type sealing brushes, and a sealing cavity is formed between two adjacent rows of B-type sealing brushes; The ends of the elastic steel plate and the steel wire set are flush.

2. The composite shield tail sealing brush for synchronously filling sealing grease for shield according to any one of claim 1, characterized in that: The installation parts of the elastic steel plate and the steel wire group are overlapped to form a whole having at least one bending part.

3. The composite shield tail sealing brush for synchronously filling sealing grease for shield according to claim 2 is characterized in that: The inner fat inlet channel extends from the head end to the end of the anterior medial steel plate and the posterior medial steel plate, and the extension length of the inner fat inlet channel exceeds the bending position of the anterior medial steel plate and the posterior medial steel plate.

4. The composite shield tail sealing brush for synchronously filling sealing grease for shield according to claim 2 is characterized in that: The end of the bottom plate extends out of the bending part of the elastic steel plate and the steel wire group.

5. The composite shield tail sealing brush for synchronously filling sealing grease for shield according to claim 1 is characterized in that: The A-type sealing brush is installed behind the shield tail boss, and the B-type sealing brush is installed behind the shield tail mounting seat.

6. A shield tail sealing method for synchronously filling sealing grease for shield, characterized in that: A composite shield tail sealing brush using the synchronously filled sealing grease for shield according to claim 1; Before the shield starts: the ends of the A-type sealing brush and the B-type sealing brush are squeezed on the outer surface of the segment, all sealing cavities are filled with shield tail sealing grease, and the A-type sealing brush and the B-type sealing brush are filled with shield tail sealing grease; As the shield advances forward, sealing grease is injected into the sealing cavity simultaneously. Under the action of the sealing grease pressure, the spring force of the B-type sealing brush becomes shorter, the movable pressure plate is squeezed open, and the sealing grease enters the gaps between the rear outer steel plate, the rear inner steel plate, the steel wire group, the front inner steel plate, and the front outer steel plate through the grease inlet hole, the inner cavity of the shield tail brush, and the internal grease inlet channel, filling the gaps fully.

7. The shield tail sealing method of synchronously filling sealing grease for shield according to claim 6 is characterized in that: When the gap at the shield tail becomes larger, the volume of the sealing brush gap will become larger, and the sealing grease will fill the enlarged gap; when the gap at the shield tail becomes smaller, the volume of the gap will become smaller, and the sealing grease in the gap will be squeezed out of the gap; no matter whether the gap at the shield tail becomes larger or smaller, the sealing grease in the gap is full.

8. The shield tail sealing method of synchronously filling sealing grease for shield according to claim 6 or 7, characterized in that: The composite shield tail sealing brush cooperates with the slurry baffle plate for sealing. The slurry baffle plate is arranged at the end of the shield tail or behind the last row of B-type sealing brushes to prevent the slurry behind the shield tail from flowing forward.

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