Shield tunneling machine tail shield slurry leakage plugging device

Abstract

A slurry leakage plugging device for a tail shield of a shield tunneling machine relates to the technical field of shield tunneling machines, is mounted in the tail shield and is used for plugging a gap between the tail shield and a duct piece. The device comprises a mounting seat, an airbag, a sealing mechanism and a cleaning mechanism, the mounting seat is of an annular structure, and the outer ring of the mounting seat is correspondingly fastened and connected with the inner wall of the tail shield; a groove is formed in the inner ring face of the mounting base, a sealing mechanism is arranged on one side of a groove opening in the mounting base ring direction, and a cleaning mechanism is arranged on the other side in the mounting base ring direction. The cleaning mechanism comprises a plurality of connecting baffles with one ends correspondingly hinged to the mounting base, and the other ends of the connecting baffles are provided with cleaning heads for cleaning the outer wall of the duct piece when the connecting baffles deflect; the plugging device is simple in structure and reliable in plugging; the cleaning mechanism cleans out a cleaning area at one end of the sealing baffle, so that the sealing baffle can effectively make contact with the outer wall of the duct piece, and it is avoided that slurry remains between the sealing baffle and the duct piece and influences the blocking effect.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machines, in particular to a slurry leakage blocking device for a tail shield of a shield machine. Background Art

[0002] The tail shield of the shield machine is an important component of its rear part. The tail shield is mainly used to cover the assembly of tunnel segments and seal the tail of the shield body. It is connected to the middle shield through an articulated cylinder and is equipped with a pre-tightened articulated seal.

[0003] As the shield machine continues to advance and the soil is excavated, the tunnel segments are installed section by section from the tail shield to the tail of the tunnel, forming the main supporting structure of the tunnel;

[0004] The sealing problem between the shield tail and the segment is currently a difficult problem in the industry. When the shield machine is excavating normally, the outside of the tail shield is surrounded by pressurized mud, and the gap between the tail shield and the segment is blocked by the shield tail brush and shield tail grease to prevent the mud from entering. However, poor welding effect of the shield tail brush or long-term excavation of the shield machine will cause the shield tail brush to wear, and the pressurized mud outside will enter the shield machine, causing certain risks to the shield machine.

[0005] A Chinese patent (publication number: CN203769785U) discloses a shield machine sealing device and a shield machine. The shield machine sealing device is arranged on the tail shield of the shield machine, including a sealing airbag and a supporting plate; the sealing airbag is annular as a whole and is arranged on the outer circumferential surface of the tail shield; the supporting plate is arranged on the outer circumferential surface of the tail shield and is arranged in front of the sealing airbag close to the sealing airbag to form a ring shape; when the sealing airbag of the patent is not inflated, it shrinks in the receiving groove, and the supporting plate covers the outer side of the sealing airbag to protect the sealing airbag from wear; if the patent is directly applied to block the gap between the tail shield and the pipe segment, The support plate will interfere with the installation of the segment, so the patented structure can only play a temporary sealing role when the original sealing structure of the tail shield fails; however, in actual use, it is found that when the original sealing structure of the tail shield fails, mud covers the wall of the segment. If the wall is not cleaned, mud or even sand and gravel particles will remain between the support plate and the wall of the segment, and the support plate cannot directly contact the wall of the segment, resulting in a poor seal; in addition, there is a problem of accidental rupture of the sealing airbag. Once the sealing airbag ruptures, the entire seal will fail; the above defects are problems that need to be urgently solved by technical personnel in this field. Utility Model Content

[0006] In order to overcome the deficiencies in the background technology, the utility model discloses a device for plugging slurry leakage of a tail shield of a shield machine.

[0007] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0008] A shield machine tail shield leakage plugging device is installed in the tail shield and is used to plug the gap between the tail shield and the pipe segment; it comprises a mounting seat, an air bag, a sealing mechanism and a cleaning mechanism; the mounting seat is annular in structure, and the outer ring of the mounting seat is correspondingly and tightly connected to the inner wall of the tail shield; a groove is provided on the inner annular surface of the mounting seat, and a sealing mechanism is provided on one side of the groove notch along the circumferential direction of the mounting seat, and a cleaning mechanism is provided on the other side along the circumferential direction of the mounting seat; an air bag for opening the sealing mechanism is provided in the groove of the mounting seat, and the air bag is provided with an air charging and discharging interface; the cleaning mechanism comprises a plurality of connecting baffles whose one end is hinged to the mounting seat, and the other end of the connecting baffle is provided with a cleaning head for cleaning the outer wall of the pipe segment when the connecting baffle is deflected, and the corresponding ends of two adjacent cleaning heads are staggered and overlapped, and the corresponding hinged position of the connecting baffle and the mounting seat is provided with a first return spring for making the connecting baffle close to the outer side of the sealing mechanism when the sealing mechanism is closed.

[0009] Preferably, the sealing mechanism includes a plurality of sealing baffles whose length is greater than the spacing between the inner annular surface of the mounting seat and the tube segment, and one end of the sealing baffle is hinged to the mounting seat; a second reset spring for closing and resetting the sealing baffle is provided at the corresponding hinged position between the sealing baffle and the mounting seat, and the corresponding ends of two adjacent sealing baffles are staggered and overlapped.

[0010] Preferably, a flexible sealing strip is provided between the corresponding ends of two adjacent sealing baffles.

[0011] Preferably, a first boss is provided on the inner side of the connecting baffle, and a second boss capable of correspondingly contacting with the first boss is provided on the inner side of one end of the sealing baffle corresponding to the connecting baffle.

[0012] Preferably, the wall of the airbag portion is adhesively connected to the bottom of the groove of the mounting seat.

[0013] Preferably, there are multiple airbags, which are arranged circumferentially and spaced apart along the groove of the mounting seat.

[0014] Preferably, the corresponding ends of two adjacent connecting baffles are staggered and overlapped.

[0015] Preferably, the cleaning head is a brush or a tough scraper.

[0016] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0017] The utility model discloses a shield machine tail shield leakage plugging device, which has a simple structure and reliable plugging. During the opening process of the sealing mechanism, the sealing baffle can first push the connecting baffle, so that the connecting baffle deflects around the corresponding hinged position of the connecting baffle and the mounting seat, and the connecting baffle drives the cleaning head during the deflection process. When the cleaning head contacts the pipe segment, it starts to clean the outer wall of the pipe segment, and sweeps the mud on the outer wall of the pipe segment to the tail of the tail shield, thereby clearing a cleaning area at one end for the sealing baffle, so that the sealing baffle can effectively contact the outer wall of the pipe segment, avoiding residual mud between the sealing baffle and the pipe segment, which affects the plugging effect.

[0018] There are multiple airbags, which can be inflated simultaneously, shortening the opening time of the sealing mechanism and the cleaning mechanism, so that the gap between the tail shield and the pipe segment can be quickly sealed; in addition, if one of the airbags ruptures accidentally, it will not affect the opening action of the sealing mechanism and the cleaning mechanism, and the ruptured airbag can be replaced separately, thereby effectively reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the sealing mechanism in the open state;

[0020] Figure 2 It is a structural schematic diagram of the sealing mechanism in a closed state;

[0021] Figure 3 It is a side view of the sealing mechanism in the open state;

[0022] Figure 4 It is a schematic diagram of the structure of the flexible sealing belt.

[0023] In the figure: 1, tail shield; 2, pipe segment; 3, mounting seat; 4, airbag; 5, sealing baffle; 6, connecting baffle; 7, cleaning head; 8, flexible sealing belt; 9, first boss; 10, second boss. DETAILED DESCRIPTION

[0024] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0025] Embodiment 1, in combination with Figures 1 to 3, a shield machine tail shield leakage plugging device, installed in the tail shield 1, used to plug the gap between the tail shield 1 and the pipe segment 2; comprising a mounting seat 3, an airbag 4, a sealing mechanism and a cleaning mechanism; the mounting seat 3 is annular in structure, and the outer ring of the mounting seat 3 is correspondingly and tightly connected to the inner wall of the tail shield 1; the inner ring surface of the mounting seat 3 is provided with a groove, and a sealing mechanism is provided on one side of the groove notch along the circumferential direction of the mounting seat 3, and a cleaning mechanism is provided on the other side along the circumferential direction of the mounting seat 3;

[0026] An airbag 4 for opening the sealing mechanism is arranged in the groove of the mounting seat 3, and the airbag 4 is provided with an air charging and discharging interface, that is, when the original sealing device between the tail shield 1 and the pipe segment 2 fails, the airbag 4 can be inflated through the air charging and discharging interface, and the airbag 4 expands, thereby opening the sealing mechanism;

[0027] The sealing mechanism comprises a plurality of sealing baffles 5 whose length is greater than the distance between the inner annular surface of the mounting seat 3 and the tube segment 2. One end of the sealing baffle 5 is hinged to the mounting seat 3, that is, after the airbag 4 is inflated, it can push the sealing baffle 5, so that the sealing baffle 5 deflects around the hinged position corresponding to the one end of the sealing baffle 5 and the mounting seat 3. Since the length of the sealing baffle 5 is greater than the distance between the inner annular surface of the mounting seat 3 and the tube segment 2, the free end of the sealing baffle 5 can contact the tube segment 2 accordingly, thereby blocking the gap between the tail shield 1 and the tube segment 2. The corresponding ends of two adjacent sealing baffles 5 are staggered and overlapped, which can effectively ensure the blocking effect; a second reset spring for closing and resetting the sealing baffle 5 is provided at the hinged position corresponding to the sealing baffle 5 and the mounting seat 3;

[0028] When the original sealing device between the tail shield 1 and the pipe segment 2 is repaired, the airbag 4 can be vented through the air charging and discharging interface to shrink the airbag 4, and the sealing baffle 5 shrinks and closes under the action of the second return spring, so that the sealing baffle 5 is separated from the pipe segment 2, avoiding interference with the advancement and installation of the pipe segment;

[0029] It should be noted that part of the wall of the airbag 4 is glued to the bottom of the groove of the mounting seat 3, that is, the airbag 4 can be retracted into the groove of the mounting seat 3 after being deflated and shrunk, avoiding interference with the shrinkage and closure of the sealing baffle 5;

[0030] The cleaning mechanism comprises a plurality of connecting baffles 6 hinged at one end to the mounting seat 3, the corresponding ends of two adjacent connecting baffles 6 overlap in an interlaced manner, the other end of the connecting baffle 6 is provided with a cleaning head 7 for cleaning the outer wall of the pipe segment 2 when the connecting baffle 6 is deflected, the corresponding ends of two adjacent cleaning heads 7 overlap in an interlaced manner, and the corresponding hinged position of the connecting baffle 6 and the mounting seat 3 is provided with a first return spring for making the connecting baffle 6 close to the outer side of the sealing mechanism when the sealing mechanism is closed, that is, in the process of opening the sealing mechanism, the sealing baffle 5 can first push the connecting baffle 6 so that the connecting baffle 6 can move around the connecting baffle The plate 6 deflects at the corresponding hinged position with the mounting seat 3, and the connecting baffle 6 drives the cleaning head 7 during the deflection process. When the cleaning head 7 contacts the pipe segment 2, it starts to clean the outer wall of the pipe segment 2, and sweeps the mud on the outer wall of the pipe segment 2 to the tail of the tail shield 1, thereby clearing a cleaning area at one end for the sealing baffle 5, so that the sealing baffle 5 can effectively contact the outer wall of the pipe segment 2, avoiding residual mud between the sealing baffle 5 and the pipe segment 2, which affects the plugging effect; according to needs, the cleaning head 7 is a brush or a tough scraper, that is, the connecting baffle 6 drives the brush or the tough scraper to clean the outer wall of the pipe segment 2 during the opening and deflection process;

[0031] When the original sealing device between the tail shield 1 and the pipe segment 2 is repaired, the connecting baffle 6 is first contracted and closed under the action of the first return spring to avoid frictional contact between the cleaning head 7 and the pipe segment 2, which affects the service life of the cleaning head 7;

[0032] It should be noted that a sealing mechanism can be provided on the side of the mounting seat 3 facing the head end of the shield machine, that is, the pressurized mud can push the sealing baffle 5, further enhancing the resistance between the sealing baffle 5 and the pipe segment 2, thereby improving the sealing effect; if the sealing mechanism is installed on the side of the mounting seat 3 away from the head end of the shield machine, the pressure in the airbag 4 needs to be greater than the pressure of the mud between the tail shield 1 and the pipe segment 2, otherwise the sealing effect cannot be achieved.

[0033] Embodiment 2: Although the above embodiment can seal the gap between the tail shield 1 and the pipe segment 2, it is found during use that the cleaning mechanism accidentally invades the sealing mechanism during the contraction and closing process of the sealing mechanism and the cleaning mechanism, resulting in the inability to drive the cleaning mechanism to perform cleaning operations when the sealing mechanism is opened again. In order to solve this technical problem, this embodiment is further improved;

[0034] Combined with Figures 1 to 3, a shield machine tail shield leakage plugging device, which is different from Example 1 in that, on the basis of Example 1, a first boss 9 is provided on the inner side of the connecting baffle 6, and a second boss 10 which can correspondingly contact with the first boss 9 is provided on the inner side of one end of the sealing baffle 5 corresponding to the connecting baffle 6, that is, after the sealing mechanism and the cleaning mechanism are opened, the first boss 9 can contact with the second boss 10, and when the sealing mechanism and the cleaning mechanism are closed, the connecting baffle 6 cannot invade the inner side of the sealing baffle 5 under the contact of the second boss 10, so that the connecting baffle 6 is always located on the outer side of the sealing baffle 5, and when the sealing mechanism is opened again, the cleaning mechanism can still be driven to clean the pipe segment 2.

[0035] Embodiment 3: It is found in actual use that although the corresponding ends of two adjacent sealing baffles 5 overlap, there is still a gap between the two adjacent sealing baffles 5, resulting in a small amount of mud leakage. To solve this technical problem, this embodiment is further improved;

[0036] Combined with Figures 1 to 4 A shield machine tail shield leakage plugging device, based on embodiment 1 or 2, a flexible sealing belt 8 is provided between the corresponding ends of two adjacent sealing baffles 5, as shown in the attached Figure 4 As shown, the flexible sealing strip 8 seals the corresponding ends of two adjacent sealing baffles 5 , which can ensure the sealing effect between the two adjacent sealing baffles 5 while not affecting the deflection action of the sealing baffles 5 .

[0037] Embodiment 4: In actual use, it was found that the airbag 4 was ruptured, resulting in the failure of the plugging. To solve this technical problem, this embodiment is further improved;

[0038] Combined with Figures 1 to 3 , a shield machine tail shield leakage plugging device, based on any one of embodiments 1 to 3, the airbags 4 are multiple, and the multiple airbags 4 are arranged circumferentially along the groove of the mounting seat 3, that is, the multiple airbags 4 can be inflated at the same time, shortening the opening time of the sealing mechanism and the cleaning mechanism, so that the gap between the tail shield 1 and the pipe segment 2 can be quickly blocked; in addition, if one of the airbags 4 is accidentally ruptured, it will not affect the opening action of the sealing mechanism and the cleaning mechanism, and the ruptured airbag 4 can be replaced separately, thereby effectively reducing the maintenance cost.

[0039] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A shield machine tail shield leakage plugging device, installed in the tail shield (1), used to plug the gap between the tail shield (1) and the pipe segment (2); Its characteristics are: The invention comprises a mounting seat (3), an air bag (4), a sealing mechanism and a cleaning mechanism; the mounting seat (3) is annular in structure, and the outer ring of the mounting seat (3) is correspondingly and tightly connected to the inner wall of the tail shield (1); a groove is provided on the inner ring surface of the mounting seat (3), and a sealing mechanism is provided on one side of the groove notch along the circumferential direction of the mounting seat (3), and a cleaning mechanism is provided on the other side along the circumferential direction of the mounting seat (3); an air bag (4) for opening the sealing mechanism is provided in the groove of the mounting seat (3), and the air bag (4) is provided with an air charging and discharging interface; the cleaning mechanism comprises a plurality of connecting baffles (6) each having one end hinged to the mounting seat (3), and a cleaning head (7) is provided at the other end of the connecting baffle (6) for cleaning the outer wall of the pipe segment (2) when the connecting baffle (6) is deflected, and the corresponding ends of two adjacent cleaning heads (7) are staggered and overlapped, and a first return spring is provided at the corresponding hinged position of the connecting baffle (6) and the mounting seat (3) so that the connecting baffle (6) and the outer side of the sealing mechanism are correspondingly in close contact with each other when the sealing mechanism is closed.

2. The shield machine tail shield leakage plugging device according to claim 1, Its characteristics are: The sealing mechanism comprises a plurality of sealing baffles (5) having a length greater than the spacing between the inner annular surface of the mounting seat (3) and the tube segment (2); one end of the sealing baffle (5) is hingedly connected to the mounting seat (3); a second reset spring for closing and resetting the sealing baffle (5) is provided at a corresponding hinged position between the sealing baffle (5) and the mounting seat (3); and corresponding ends of two adjacent sealing baffles (5) are staggered and overlapped.

3. The shield machine tail shield leakage plugging device according to claim 2, Its characteristics are: A flexible sealing belt (8) is provided between the corresponding ends of two adjacent sealing baffles (5).

4. The shield machine tail shield leakage plugging device according to claim 2, Its characteristics are: A first boss (9) is provided on the inner side of the connecting baffle (6), and a second boss (10) capable of correspondingly contacting the first boss (9) is provided on the inner side of one end of the sealing baffle (5) corresponding to the connecting baffle (6).

5. The shield machine tail shield leakage plugging device according to claim 1 or 2, Its characteristics are: Part of the wall of the air bag (4) is glued to the bottom of the groove of the mounting seat (3).

6. The shield machine tail shield leakage plugging device according to claim 1 or 2, Its characteristics are: There are a plurality of airbags (4), and the plurality of airbags (4) are arranged at intervals in the circumferential direction along the groove of the mounting seat (3).

7. The shield machine tail shield leakage plugging device according to claim 1, Its characteristics are: The corresponding ends of two adjacent connecting baffles (6) are staggered and overlapped.

8. The shield machine tail shield leakage plugging device according to claim 1 or 2, Its characteristics are: The cleaning head (7) is a brush or a tough scraper.

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