Sealing structure and double-shield tunneling machine comprising same

Abstract

The utility model relates to the technical field of tunnel construction, in particular to a sealing structure and a double-shield tunneling machine comprising the same, and the sealing structure comprises a first sealing assembly, a second sealing assembly and a third sealing assembly; the first sealing assembly is arranged on the side wall, close to the outlet end, of the gripper shoe cavity. The second sealing assembly is arranged at the end, away from the supporting face, of the supporting shoe. The third sealing assembly is arranged on an inner side plate, opposite to the outlet end, in the gripper shoe cavity; the third sealing assembly comprises a pressing seal arranged in the circumferential direction of the inner side plate of the gripper shoe cavity and a plurality of adjustable sealing supporting assemblies used for bearing the pressing seal. According to the sealing structure, multiple seals are formed between the supporting shoe and the supporting shoe cavity, safety and reliability are high, the problem of sealing and pressure maintaining of the supporting shoe cavity after the supporting shoe is withdrawn in an earth pressure mode is effectively solved, and risks caused by sealing failure are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel construction technical field, concretely relates to a sealing structure and contain its double shield tunneling machine. BACKGROUND

[0002] Tunneling machine is widely used in underground tunnel construction due to its fast tunneling speed, safe work, small influence on underground environment and other advantages. Tunneling machine mainly has mud water, soil pressure and hard rock TBM modes, and different modes of tunneling machine need to be applied according to different geology. However, tunneling machine often tunnels not only in single geological condition, but also in multiple geological conditions, thereby putting forward the demand for multi-mode tunneling machine. For the complex working condition that soil and hard rock geology appear alternately, soil pressure and hard rock TBM double-mode tunneling machine needs to be designed for tunneling, and the sealing and pressure maintaining problem of the support shoe cavity under soil pressure mode needs to be considered under double-mode work.

[0003] In summary, it is urgent to provide a sealing structure and contain its double shield tunneling machine to solve the sealing and pressure maintaining problem of the support shoe cavity under soil pressure mode. INVENTION CONTENTS

[0004] The utility model aims at providing a sealing structure and contain its double shield tunneling machine, and the specific technical scheme is as follows:

[0005] A sealing structure comprises a first sealing assembly, a second sealing assembly and a third sealing assembly.

[0006] The first sealing assembly is arranged on the side wall of the support shoe cavity close to the outlet end; the second sealing assembly is arranged on the inner end face of the support shoe opposite to the supporting surface; and the third sealing assembly is arranged on the inner side plate of the support shoe cavity opposite to the outlet end.

[0007] The third sealing assembly comprises a compression seal arranged along the circumference of the inner side plate of the support shoe cavity and a plurality of adjustable sealing support assemblies for bearing the compression seal.

[0008] Further, the first sealing assembly comprises an annular grease storage groove in communication with a grease supply system and a plurality of grease injection holes.

[0009] The annular grease storage groove is arranged on the side wall of the support shoe cavity close to the outlet end, and the grease injection holes are uniformly distributed in the annular grease storage groove in the circumferential direction.

[0010] Further, the second sealing assembly comprises a plurality of sealing strips, and the sealing strips are arranged in concentric ring shape on the inner end face of the support shoe.

[0011] Further, the sealing strip adopts a double-lip structure, and the lip direction is towards the inner side plate of the support shoe cavity.

[0012] Further, the adjustable sealing support assembly comprises a support plate and an adjusting rod, the support plate is detachably connected to the pressing shield, and the adjusting rod is adjustably arranged on the support plate, and the adjusting direction of the adjusting rod is perpendicular to the pressing plane of the pressing seal.

[0013] Further, the support plate is L-shaped, and the adjusting rods are arranged on the two limbs of the support plate respectively, and the adjusting rods abut against the pressing seal.

[0014] Further, the adjustable sealing support assembly is arranged in a number of not less than 8 groups and is distributed along the inner side plate of the support shoe cavity at equal intervals in the circumferential direction.

[0015] A double-shield tunneling machine comprises a pressing shield, the pressing shield is provided with a support shoe cavity and a support shoe, and the support shoe cavity and the support shoe are sealed by the sealing structure as described above.

[0016] Further, the support shoe oil cylinder is connected with the support shoe and is used for driving the support shoe to extend and retract in the support shoe cavity.

[0017] The technical scheme of the utility model has the following beneficial effects:

[0018] (1) The utility model provides a sealing structure, including first sealing assembly, second sealing assembly and third sealing assembly, first sealing assembly set up on the side wall of support shoe cavity close to the export end, second sealing assembly set up on the inner end face opposite to the support surface of support shoe, third sealing assembly set up on the inner side plate opposite to the export end in support shoe cavity, third sealing assembly includes along the inner side plate of support shoe cavity circumferential arrangement pressing seal and a plurality of for bearing pressing seal adjustable sealing support assembly, the sealing structure provided by the utility model forms multiple seals between support shoe and support shoe cavity, and safety reliability is high, and the sealing pressure maintaining problem of support shoe cavity after the support shoe is retracted under the earth pressure mode is effectively solved, and the risk brought by sealing failure is reduced.

[0019] (2) In the utility model, first sealing assembly set up on the side wall of support shoe cavity close to the export end, first sealing assembly adopts grease sealing structure, including annular grease storage groove and a plurality of grease injection holes who communicates with grease supply system, and grease is injected into the gap between support shoe cavity and support shoe through grease injection hole, thereby cutting off the invasion of silt and gravel, and the second sealing assembly is protected from being damaged by silt and gravel.

[0020] (3) In the utility model, second sealing assembly set up on the inner end face of support shoe, and second sealing assembly includes a plurality of concentric ring-shaped rubber sealing strips, and the support shoe is driven to move in the support shoe cavity through the retraction of support shoe oil cylinder, when the support shoe moves to the limit position, a plurality of rubber sealing strips are contacted and pressed by the support shoe cavity, and then the sealing function is realized, and the rubber sealing strip is arranged on the inner end face of support shoe, so that the inspection and replacement can be carried out in the tunneling process.

[0021] (4) The third sealing assembly is arranged on the inner side plate opposite to the outlet end in the support shoe cavity, the third sealing assembly comprises a compression sealing arranged in the circumferential direction of the inner side plate of the support shoe cavity and a plurality of adjustable sealing support assemblies for bearing the compression sealing.

[0022] (5) The adjustable sealing support assembly is detachably connected to the support shield, so that the maintenance and replacement are facilitated.

[0023] (6) The utility model provides a double shield tunneling machine, including support shield, be equipped with support shoe cavity and support shoe on the support shield, the support shoe cavity and support shoe are sealed through the sealing structure as the above-mentioned, satisfy the sealing need under the earth pressure mode.

[0024] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The utility model will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide further understanding of the utility model, the schematic embodiment of the utility model and its description are used to explain the utility model, and do not constitute improper limitation to the utility model. In the drawings:

[0026] Figure 1 It is the distribution schematic drawing of the sealing structure in the utility model embodiment;

[0027] Figure 2 It is the schematic diagram of the sealing structure;

[0028] Figure 3 It is the schematic diagram of the first sealing assembly;

[0029] Figure 4 It is the schematic diagram of the second sealing assembly;

[0030] Figure 5 It is Figure 2 The partial enlarged view of;

[0031] Wherein, 1, the first sealing assembly, 1.1, the annular grease storage groove, 1.2, the grease injection hole, 2, the second sealing assembly, 2.1, the sealing strip, 3, the third sealing assembly, 3.1, the compression sealing, 3.2, the adjustable sealing support assembly, 3.2.1, the support plate, 3.2.2, the adjusting rod, 4, the support shoe cavity, 5, the support shoe, 6, the support shield, 7, the support shoe oil cylinder. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below with reference to the drawings, but the present application can be implemented in various different ways as defined and covered.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0035] Embodiments

[0036] Referring to Figures 1-5 , the present embodiment provides a sealing structure, comprising a first sealing assembly 1, a second sealing assembly 2 and a third sealing assembly 3;

[0037] Referring to Figures 1-3 , the first sealing assembly 1 is arranged on the side wall of the support shoe cavity 4 close to the outlet end; the first sealing assembly 1 adopts a grease sealing structure, comprising an annular grease storage groove 1.1 in communication with a grease supply system and a plurality of grease injection holes 1.2; the annular grease storage groove 1.1 is arranged on the side wall of the support shoe cavity 4 close to the outlet end, and the grease injection holes 1.2 are uniformly distributed in the annular grease storage groove 1.1 in the circumferential direction; the grease is injected into the gap between the support shoe cavity 4 and the support shoe 5 through the grease injection holes 1.2, thereby blocking the intrusion of the sand and gravel, and protecting the second sealing assembly 2 from being damaged by the sand and gravel.

[0038] Referring to Figure 1 , Figure 2 and Figure 4The second sealing assembly 2 is arranged on the inner end surface of the support shoe 5 opposite to the supporting surface; the second sealing assembly 2 comprises a plurality of sealing strips 2.1 arranged in a concentric ring shape on the inner end surface of the support shoe 5; in the embodiment, the sealing strips 2.1 are rubber sealing strips. In the earth pressure mode, the support shield 6 retracts the support shoe 5 through the support shoe oil cylinder 7, and when the support shoe 5 is retracted to the limit position, the sealing strips 2.1 arranged on the inner end surface of the support shoe 5 (i.e. the end surface of the end opposite to the supporting surface) are pressed against the inner side plate of the support shoe cavity 4, thereby realizing the sealing of the support shoe cavity 4 to the outside.

[0039] In the embodiment, the sealing strips 2.1 adopt a double-lip structure, and the lip direction is towards the inner side plate of the support shoe cavity 4.

[0040] Referring to Figure 1 , Figure 2 and Figure 5 , the third sealing assembly 3 is arranged on the inner side plate of the support shoe cavity 4 opposite to the outlet end; the third sealing assembly 3 comprises a compression seal 3.1 arranged along the circumference of the inner side plate of the support shoe cavity 4 and a plurality of adjustable sealing support assemblies 3.2 for bearing the compression seal 3.1. When the second sealing assembly 2 installed on the support shoe 5 fails to seal, the compression seal 3.1 is pressed against the inner end surface of the support shoe 5 by adjusting the adjustable sealing support assemblies 3.2, thereby realizing the sealing of the support shoe cavity 4 to the outside.

[0041] Referring to Figure 5 , in the embodiment, the adjustable sealing support assembly 3.2 comprises a support plate 3.2.1 and an adjusting rod 3.2.2, the support plate 3.2.1 is detachably connected to the support shield 6 by bolts, and the adjusting rod 3.2.2 is adjustably arranged on the support plate 3.2.1, and the adjusting direction of the adjusting rod 3.2.2 is perpendicular to the compression plane of the compression seal 3.1.

[0042] In the embodiment, the support plate 3.2.1 is L-shaped, and the adjusting rod 3.2.2 is arranged on each limb of the support plate 3.2.1, and the adjusting rod 3.2.2 abuts against the compression seal 3.1. Specifically, the adjusting rod 3.2.2 adopts a bolt, and the two limbs of the support plate 3.2.1 are correspondingly provided with threaded holes matched with the bolt, and the setting position of the threaded hole corresponds to the compression seal 3.1. By adjusting the extension length of the bolt, the compression seal 3.1 is tightened, so that the compression seal 3.1 is pressed against the inner end surface of the support shoe 5, and at the same time, the compression seal 3.1 is tightly attached to the end surface of the inner side plate of the support shoe cavity 4, thereby realizing the sealing between the support shoe 5 and the support shoe cavity 4.

[0043] In the embodiment, preferably, the compression seal 3.1 adopts an annular rubber sealing strip, and the number of the adjustable sealing support assemblies 3.2 is not less than 8, and they are distributed at equal intervals along the circumference of the end surface of the inner side plate of the support shoe cavity 4.

[0044] The sealing structure provided by the utility model forms multiple seals between the support shoe 5 and the support shoe cavity 4, is safe and reliable, effectively solves the sealing and pressure maintaining problem of the support shoe cavity 4 after the support shoe 5 is retracted under the earth pressure mode, reduces the risk caused by sealing failure; in addition, the second sealing assembly 2 and the third sealing assembly 3 provided by the utility model have relatively small sealing areas, are beneficial to the inspection and replacement of the sealing assembly in the tunneling process, meanwhile, the sealing assembly occupies small space, meets the demand of the operation space required by the slag removal of the support shoe cavity 4 under the TBM mode.

[0045] The utility model also provides a double shield tunneling machine, including support shield 6, see Figure 1 The support shoe oil cylinder 7 is connected with the support shoe 5 and is used for driving the support shoe 5 to stretch out and shrink in the support shoe cavity 4. Under the earth pressure mode, the support shoe 5 is retracted to the limit position in the support shoe cavity 4 through the support shoe oil cylinder 7, the support shoe cavity 4 and the support shoe 5 are sealed through the sealing structure as mentioned above, and the sealing requirement under the earth pressure mode is met.

[0046] The above only is the preferred embodiment of the utility model and does not limit the utility model, and the utility model can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A seal structure, characterized by, The sealing structure comprises a first sealing assembly (1), a second sealing assembly (2) and a third sealing assembly (3); The first sealing assembly (1) is arranged on the side wall of the support shoe cavity (4) near the outlet end; the second sealing assembly (2) is arranged on the inner end surface of the support shoe (5) opposite to the supporting surface; and the third sealing assembly (3) is arranged on the inner side plate of the support shoe cavity (4) opposite to the outlet end. The third sealing assembly (3) comprises a compression seal (3.1) arranged along the inner side plate of the support shoe cavity (4) in the circumferential direction and a plurality of adjustable sealing support assemblies (3.2) for bearing the compression seal (3.1).

2. A seal structure according to claim 1, wherein The first sealing assembly (1) comprises an annular grease storage groove (1.1) in communication with a grease supply system and a plurality of grease injection holes (1.2). The annular grease storage groove (1.1) is arranged on the side wall of the support shoe cavity (4) near the outlet end, and the grease injection holes (1.2) are uniformly distributed in the circumferential direction in the annular grease storage groove (1.1).

3. The seal structure of claim 1, wherein The second sealing assembly (2) comprises a plurality of sealing strips (2.1) arranged in a concentric ring shape on the inner end surface of the support shoe (5).

4. A seal structure according to claim 3, wherein The sealing strip (2.1) adopts a double-lip structure, and the lip direction is towards the inner side plate of the support shoe cavity (4).

5. A seal according to any one of claims 1 to 4, wherein The adjustable sealing support assembly (3.2) comprises a support plate (3.2.1) and an adjusting rod (3.2.2), the support plate (3.2.1) is detachably connected to the compression shield (6), the adjusting rod (3.2.2) is adjustably arranged on the support plate (3.2.1), and the adjusting direction of the adjusting rod (3.2.2) is perpendicular to the compression plane of the compression seal (3.1).

6. A seal structure according to claim 5, wherein The support plate (3.2.1) is L-shaped, and the adjusting rod (3.2.2) is arranged on each limb of the support plate (3.2.1), and the adjusting rod (3.2.2) abuts against the compression seal (3.1).

7. The sealed structure of claim 1, wherein The number of the adjustable sealing support assemblies (3.2) is not less than 8, and they are distributed at equal intervals along the inner side plate of the support shoe cavity (4) in the circumferential direction.

8. A double shield tunnel boring machine characterized by, The support shoe cavity (4) and the support shoe (5) are arranged on the compression shield (6), and the compression shield (6) is sealed by the sealing structure according to any one of claims 1-7.

9. Double shield tunneling machine in accordance with claim 8, characterized in that The support shoe oil cylinder (7) is connected with the support shoe (5) and is used to drive the support shoe (5) to extend and retract in the support shoe cavity (4).

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