Shield sealing device and shield sealing method

Abstract

The present invention provides a shield sealing device and a shield sealing method. A shield receiving tunnel entrance is provided with a retaining pile, and the shield sealing device is mounted on the retaining pile. The shield sealing device includes: an elastic inner ring, the inner wall of which is adapted to mate with the outer wall of the shield machine's cutterhead; multiple control units, each mounted on the retaining pile; the multiple control units are spaced apart circumferentially around the elastic inner ring, with the drive ends of the control units pressing against the outer side of the elastic inner ring to squeeze or release the elastic inner ring. As the shield machine advances, the inner diameter of the shield machine gradually decreases as it passes through the tunnel entrance. The control units squeeze the elastic inner ring, causing it to rest against the side wall of the shield machine, effectively sealing the tunnel entrance and preventing water and slurry leakage. Manual plate insertion is unnecessary, resulting in a high safety factor and easy operation.

Description

Technical Field

[0001] The present invention relates to the technical field of shield equipment, and in particular to a shield sealing device and a shield sealing method. Background Art

[0002] In recent years, shield tunneling has gradually been introduced into tunnel construction. This new method of underground excavation has become a key component of transportation development in major cities both domestically and internationally. Its advantages include high throughput, high speed, low noise, and minimal pollution. Its positive ecological, economic, and social benefits have led to its increasing popularity.

[0003] Shield construction is mainly divided into three stages: starting, normal excavation, and reception. Shield machine reception refers to the process of the shield machine moving from the tunnel construction in progress to the shield construction working shaft. The shield reception begins when the cutterhead cuts through the sealing wall and enters the working shaft. Portal curtains and pressure plates need to be installed at the reception portal to seal the portal leakage channel. Because the cutterhead diameter is larger than the rest of the shield machine, the diameter of the shield construction cutterhead is larger than the shield diameter. If the shield machine moves forward to receive, it will still form a water and slurry leakage channel. This can easily cause the shield machine to jam and delay the construction period, as well as major disasters such as landslides at the reception portal and surface subsidence.

[0004] Patent 201820986172.4, a sealing rubber curtain for shield receiving construction. This utility model discloses a sealing curtain for shield receiving construction, comprising a steel ring plate A, a steel ring plate B, a hinged pressure plate, a lifting ring, a steel wire rope, and a curtain rubber sheet. When the shield's front shield shell is pushed out of the tunnel portal, the steel wire rope on the pressure plate's clamping ring adjusts the hinged pressure plate to press the curtain rubber sheet as tightly as possible to prevent leakage of mud and slurry from the tunnel portal. As the segment is pulled out of the shield tail, the steel wire rope is tightened again, allowing the pressure plate to compress the rubber curtain, ensuring that the curtain continues to perform its sealing function, resulting in an effective sealing effect. The device described in this patent does not take into account the changes in the size of the shield machine itself and the differences in diameters of different parts. It is also a manual mechanical method to change the contact between the sealing curtain and the shield machine, which cannot guarantee the sealing of the shield machine throughout the entire process. In addition, the construction efficiency is low and time-consuming. In addition, when the cutterhead comes out of the hole, since the diameter of the cutterhead of the shield machine itself is larger than that of other parts of the shield machine, it is easy for water leakage and slurry leakage to occur at the transition point due to poor sealing.

[0005] In order to solve this problem, a circle of curtains and pressure plates are generally arranged around the receiving hole of the shield machine as a sealing device. However, since the diameter of the shield machine's cutter head is larger than other parts of the shield machine, this method can only play a sealing role to a certain extent. As the shield machine gradually exits the hole, the overall diameter tends to become smaller and smaller, and the sealing effect will become worse and worse. Therefore, it is necessary to manually insert the plates step by step. However, this method is time-consuming and risky, affecting the construction efficiency of the tunnel, and even causing major disasters such as cave entrance collapse and surface subsidence. Summary of the Invention

[0006] The main purpose of the present invention is to provide a shield sealing device and a shield sealing method to solve the problem of poor sealing during the shield machine exiting the tunnel in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a shield sealing device is provided, wherein guard piles are provided at the shield receiving hole, and the shield sealing device is installed on the guard piles. The shield sealing device includes: an elastic inner ring, the inner wall of the elastic inner ring is adapted to the outer wall of the cutter head of the shield machine; a plurality of control parts, and the plurality of control parts are installed on the guard piles; the plurality of control parts are arranged at intervals along the circumference of the elastic inner ring, and the driving end of the control part is pressed against the outer side of the elastic inner ring to squeeze or release the elastic inner ring.

[0008] Furthermore, there are six control parts, and the six control parts are arranged at equal intervals along the circumference of the elastic inner ring.

[0009] Furthermore, the control part includes a driving device and a push plate installed at the output end of the driving device, and the push plate abuts against the outside of the elastic inner ring.

[0010] Furthermore, a recess is provided on the inner wall of the push plate, the recess extends along the length direction of the push plate, and the recess is matched with the outer wall of the elastic inner ring.

[0011] Furthermore, there is a reserved gap between two adjacent control parts, and a protrusion is provided on the elastic inner ring. The protrusion is adapted to the reserved gap and is installed in the reserved gap.

[0012] Furthermore, the elastic inner ring is made of rubber and the interior of the elastic inner ring is inflated.

[0013] Furthermore, the driving device includes a hydraulic power device.

[0014] Furthermore, the shield sealing device also includes a detection device, which is installed on the elastic inner ring and is used to detect the distance between the side wall of the shield machine and the elastic inner ring.

[0015] According to another aspect of the present invention, a shield sealing method is provided, which adopts the above-mentioned shield sealing device, and the method includes: when the cutter head is located in the elastic inner ring, the control part is in the initial position; when the front shield of the shield machine is located in the elastic inner ring, the control part squeezes the elastic inner ring to a first state; when the middle shield of the shield machine is located in the elastic inner ring, the control part squeezes the elastic inner ring to a second state; when the rear shield of the shield machine is located in the elastic inner ring, the control part squeezes the elastic inner ring to a third state.

[0016] Furthermore, in the first state, the elastic inner ring squeezed by the control part abuts against the side wall of the front shield of the shield machine; in the second state, the elastic inner ring squeezed by the control part abuts against the side wall of the middle shield of the shield machine; in the third state, the elastic inner ring squeezed by the control part abuts against the side wall of the rear shield of the shield machine.

[0017] By applying the technical solution of the present invention, when the shield machine moves, the inner diameter of the shield machine gradually decreases when passing through the tunnel opening. The elastic inner ring is squeezed by the control unit, so that the elastic inner ring is pressed against the side wall of the shield machine, achieving a good sealing effect of the tunnel opening, avoiding water leakage and slurry leakage problems, without the need for manual insertion of plates, with a high safety factor and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A simplified radial cross-sectional view schematically showing an embodiment of the shield sealing device of the present invention; and

[0020] Figure 2 The structure diagram of the control area of the shield sealing device of the present invention is schematically shown;

[0021] Figure 3 The structural diagram of an embodiment of the shield sealing device of the present invention installed at a tunnel opening is schematically shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Guard pile; 20. Control unit; 30. Elastic inner ring; 40. Push plate; 50. Cutter head; 60. Front shield; 70. Middle shield; 80. Rear shield. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] As described in the background technology, currently a circle of curtains and pressure plates are generally arranged around the receiving tunnel of the shield machine as a sealing device. However, since the diameter of the cutter head of the shield machine itself is larger than that of other parts of the shield machine, this method can only play a sealing role to a certain extent. As the shield machine gradually exits the tunnel, the overall diameter tends to become smaller and smaller, and the sealing effect will become worse and worse. Therefore, it is necessary to manually insert the plates step by step. However, this method is time-consuming and risky, affecting the construction efficiency of the tunnel, and even causing major disasters such as tunnel entrance collapse and surface subsidence.

[0026] When the shield machine exits the hole, the cutterhead breaks out of the hole first, and the diameter of the cutterhead of the shield machine itself is larger than the other parts of the shield machine. Therefore, during the process of the shield machine exiting the hole, the sealing of the receiving hole will become worse and worse. Figure 3 As shown in the figure, the cutterhead diameter > front shield diameter > middle shield diameter > shield tail diameter. Therefore, if the seal is fixed, water and slurry leakage will inevitably occur later. The traditional method is to manually insert the plate, which is time-consuming and risky.

[0027] To solve the above problems, see Figures 1 to 3 As shown, an embodiment of the present invention provides a shield sealing device. A retaining pile 10 is provided at the receiving tunnel entrance of the shield machine. The shield sealing device is installed on the retaining pile 10. The shield sealing device includes an elastic inner ring 30 and multiple control units 20. The inner wall of the elastic inner ring 30 is adapted to the outer wall of the cutterhead 50 of the shield machine. The multiple control units 20 are installed on the retaining pile 10. The multiple control units 20 are spaced apart along the circumference of the elastic inner ring 30. The driving end of the control unit 20 presses against the outer side of the elastic inner ring 30 to squeeze or release the elastic inner ring 30. As the shield machine moves, the inner diameter of the shield machine gradually decreases as it passes through the tunnel entrance. The control unit squeezes the elastic inner ring so that the elastic inner ring is pressed against the side wall of the shield machine, achieving a good sealing effect on the tunnel entrance, avoiding water leakage and slurry leakage, and eliminating the need for manual plate insertion. The safety factor is high and the operation is convenient.

[0028] Preferably, in this embodiment, there are six control sections 20, which are evenly spaced along the circumference of the elastic inner ring 30. Of course, in other embodiments, the number of control sections may be any other number that achieves a good sealing effect. Dividing the entire device into six large areas facilitates deformation of the entire elastic inner ring when pressure is applied, thereby adapting to changes in the shield machine's diameter during exit, ensuring a tight seal throughout the entire exit process.

[0029] To apply force more evenly to the elastic inner ring and prevent damage to the elastic inner ring, the control unit 20 in this embodiment includes a drive device and a push plate 40 installed at the output end of the drive device. The push plate 40 abuts against the outside of the elastic inner ring 30. The push plate increases the force-bearing area of the elastic inner ring, thereby preventing damage to the elastic inner ring.

[0030] Preferably, the push plate 40 in this embodiment has a recessed portion on its inner wall, which mates with the outer wall of the elastic inner ring 30. The recessed portion extends along the length of the push plate 40, i.e., in the same direction as the push plate. This recessed portion further increases the force-bearing area between the elastic inner ring and the push plate. It also serves as a position limiter for the elastic inner ring, preventing it from shifting during compression or release. Multiple protrusions are positioned within the recessed portion to increase friction between the elastic inner ring and the push plate, preventing movement.

[0031] In order to avoid interference between adjacent control parts during the extrusion movement, a reserved gap is provided between the two adjacent control parts 20 in this embodiment, and a protrusion is provided on the elastic inner ring 30, which is adapted to the reserved gap and installed in the reserved gap. By providing the protrusion and making the protrusion cooperate with the reserved gap, a certain limiting effect can be played, further preventing the elastic inner ring from deviating and ensuring the sealing when the overall caliber is reduced.

[0032] Preferably, in order to ensure the elasticity of the elastic inner ring, the elastic inner ring 30 in this embodiment is made of rubber, and the elastic inner ring 30 is inflated.

[0033] The driving device in this embodiment includes a hydraulic power device, which includes a hydraulic pump and a telescopic cylinder. Of course, the driving device can also be completed by other power devices, such as a pneumatic device.

[0034] The shield sealing device in this embodiment also includes a detection device, which is installed on the elastic inner ring 30 and is used to detect the distance between the side wall of the shield machine and the elastic inner ring 30. The detection device can be an infrared distance sensor or other distance sensors.

[0035] According to another aspect of the present invention, a shield sealing method is provided, which utilizes the above-mentioned shield sealing device. The method includes: when the cutterhead 50 is located in the elastic inner ring 30, the control unit 20 is in an initial position; when the front shield 60 of the shield machine is located in the elastic inner ring 30, the control unit 20 squeezes the elastic inner ring 30 to a first state; when the middle shield 70 of the shield machine is located in the elastic inner ring 30, the control unit 20 squeezes the elastic inner ring 30 to a second state; when the rear shield 80 of the shield machine is located in the elastic inner ring 30, the control unit 20 squeezes the elastic inner ring 30 to a third state. A detection device is used to determine which part of the shield machine is passing through the elastic inner ring.

[0036] In the first state, the elastic inner ring 30 squeezed by the control part 20 abuts against the side wall of the front shield 60 of the shield machine; in the second state, the elastic inner ring 30 squeezed by the control part 20 abuts against the side wall of the middle shield 70 of the shield machine; in the third state, the elastic inner ring 30 squeezed by the control part 20 abuts against the side wall of the rear shield 80 of the shield machine.

[0037] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0038] As the shield machine advances, its inner diameter gradually decreases as it passes through the tunnel opening. The control unit squeezes the elastic inner ring, forcing it to rest against the sidewall of the shield machine, effectively sealing the tunnel opening and preventing water and slurry leakage. This eliminates the need for manual plate insertion, resulting in a high safety factor and easy operation. The entire sealing device is automated, eliminating the need for manual plate insertion to ensure a tight seal during the shield machine's exit, resulting in safety, reliability, and high efficiency. The sealing fabric within the sealing device is made of two materials: steel and rubber. This ensures both the strength of the entire shield receiving tunnel opening and the deformability of the entire sealing device.

[0039] It should be noted that the above detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0042] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0043] For ease of description, spatially relative terms, such as "on," "above," "on the upper surface of," and "upper," may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0044] For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0045] In the above detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar parts, unless the context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that aspects of the present disclosure, as generally described herein and illustrated in the accompanying drawings, may be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are expressly contemplated herein.

[0046] The present disclosure according to the specific embodiments described in this application is not limited, and is intended to be an illustration of various aspects. As will be clear to those skilled in the art, many modifications and changes can be made without departing from the spirit and scope of the present disclosure. Within the scope of the present disclosure, functionally equivalent methods and devices, in addition to those listed herein, will be clear to those skilled in the art from the foregoing description. Such modifications and changes are intended to fall within the scope of the appended claims. The present disclosure will be limited only by the terms of the appended claims and the full scope of equivalents to which such claims are entitled. It will be understood that the present disclosure is not limited to specific methods, reagents, compounds, compositions or biological systems, which may of course vary. It will also be understood that the terms used herein are only for the purpose of describing specific embodiments and are not intended to be restrictive.

[0047] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A shield sealing device, characterized in that: A retaining pile (10) is provided at the shield receiving hole, and the shield sealing device is installed on the retaining pile (10). The shield sealing device comprises: An elastic inner ring (30), wherein the inner wall of the elastic inner ring (30) is adapted to the outer wall of the cutterhead (50) of the shield machine; A plurality of control parts (20), wherein the plurality of control parts (20) are installed on the retaining pile (10); A plurality of control parts (20) are arranged at intervals along the circumference of the elastic inner ring (30), and a driving end of the control part (20) is pressed against the outer side of the elastic inner ring (30) to squeeze or release the elastic inner ring (30); The control unit (20) includes a driving device and a push plate (40) installed at the output end of the driving device, wherein the push plate (40) abuts against the outside of the elastic inner ring (30); The inner wall of the push plate (40) is provided with a recessed portion, the recessed portion extending along the length direction of the push plate (40), and the recessed portion is adapted to the outer wall of the elastic inner ring (30); A plurality of convex portions are provided inside the concave portion; The shield sealing device further comprises a detection device, which is mounted on the elastic inner ring (30) and is used to detect the distance between the side wall of the shield machine and the elastic inner ring (30); There is a reserved gap between two adjacent control parts (20), and a protrusion is provided on the elastic inner ring (30), the protrusion is adapted to the reserved gap, the protrusion is installed in the reserved gap, and the protrusion cooperates with the reserved gap to limit the elastic inner ring (30) and prevent the elastic inner ring (30) from deflecting.

2. The shield sealing device according to claim 1, characterized in that: There are six control parts (20), and the six control parts (20) are arranged at equal intervals along the circumference of the elastic inner ring (30).

3. The shield sealing device according to claim 1, characterized in that: The elastic inner ring (30) is made of rubber, and the elastic inner ring (30) is inflated.

4. The shield sealing device according to claim 1, characterized in that: The driving device includes a hydraulic power unit.

5. A shield sealing method, characterized in that: The shield sealing method adopts a shield sealing device, and the shield sealing device is the shield sealing device according to any one of claims 1 to 4. The method comprises: When the cutter disc (50) is located in the elastic inner ring (30), the control portion (20) is in an initial position; When the front shield (60) of the shield machine is located in the elastic inner ring (30), the control unit (20) squeezes the elastic inner ring (30) to a first state; When the middle shield (70) of the shield machine is located in the elastic inner ring (30), the control unit (20) squeezes the elastic inner ring (30) to a second state; When the backing (80) of the shield machine is located in the elastic inner ring (30), the control unit (20) presses the elastic inner ring (30) to a third state.

6. The shield sealing method according to claim 5, characterized in that: In the first state, the elastic inner ring (30) squeezed by the control unit (20) abuts against the side wall of the shield machine front shield (60); In the second state, the elastic inner ring (30) squeezed by the control unit (20) abuts against the side wall of the shield (70) of the shield machine; In the third state, the elastic inner ring (30) squeezed by the control unit (20) abuts against the side wall of the shield machine backing (80).

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