Conversion ring for top shield construction

Abstract

The utility model discloses a conversion ring for top shield construction in the technical field of top shield construction, which is used for being arranged between a shield tunneling machine and a pipeline and comprises a sealing shell and a pushing oil cylinder. The sealing shell comprises a first side wall and a second side wall which can relatively move in the axial direction of the pipe body, and the first face of the first side wall and the first face of the second side wall abut against the shield tunneling machine and the pipeline correspondingly. The pushing oil cylinder is arranged in the sealing shell, the two ends of the pushing oil cylinder are fixedly arranged on the second face of the first side wall and the second face of the second side wall respectively, the distance between the first side wall and the second side wall is controlled through the pushing oil cylinder, and impact force generated when a pipeline is jacked is prevented from directly acting on the shield tunneling machine. And stable thrust is provided for the shield tunneling machine through the pushing oil cylinder subsequently, so that the safe use of the shield tunneling machine is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of top shield construction, in particular to a conversion ring for top shield construction. Background Art

[0002] With the continuous development of social urbanization, the development and utilization of underground space in my country has increased rapidly, and construction methods have become more and more diverse. Among them, the related technologies and applications of pipe jacking and shield method are quite mature, while the top shield method is currently in the development stage and has not been widely used in practice. Since the top shield method has a wider application space than the pipe jacking method, is more adaptable, and is cheaper than the shield method, the top shield method will be more widely used in underground construction in the future. When using the top shield method for construction, top shield conversion is an indispensable link.

[0003] Since the shield machine is advanced by the jacking method in the early stage of the top shield construction, it is necessary to add a conversion ring structure at the tail position of the shield. The traditional conversion ring is a rigid structure. During the jacking process of the pipe segment, there is uneven friction between the pipe segment and the formation, so the pipe segment will be stuck during jacking, which will produce impact force on the shield machine at the front end of the pipe segment and may cause damage to the internal components of the shield machine.

[0004] Based on this, the utility model designs a conversion ring for top shield construction to solve the above problems. Utility Model Content

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a conversion ring for top shield construction, which is used to be arranged between a shield machine and a pipeline, and the conversion ring for top shield construction includes a sealing shell and a thrust cylinder; the sealing shell includes a first side wall and a second side wall that can move relative to each other in the axial direction of the tube body, and the first surface of the first side wall and the first surface of the second side wall are respectively abutted against the shield machine and the pipeline; the thrust cylinder is arranged in the sealing shell, and the two ends of the thrust cylinder are respectively fixed to the second surface of the first side wall and the second surface of the second side wall.

[0006] As a further solution of the utility model, the sealed shell includes a first shell, a second shell and a sealing assembly, the first shell and the second shell are both single-sided openings, one end of the second shell opening is arranged in the opening of the first shell to connect the inner cavities of the first shell and the second shell, a sealing assembly is provided at the part where the inner cavity wall of the first shell and the outer wall of the second shell are gap-fitted, and the side walls of the inner cavities of the first shell and the second shell that are opposite in the axial direction of the pipeline are respectively the first side wall and the second side wall.

[0007] As a further solution of the utility model, the projection shapes of the first shell and the second shell in the axial direction of the pipeline match the cross-sectional shape of the pipeline, and a plurality of push cylinders are provided in the inner cavities of the first shell and the second shell, and the plurality of push cylinders are arranged along the contour line of the pipeline cross-section.

[0008] As a further solution of the present invention, the opening end of the second shell is formed with a retracted portion for inserting into the opening of the first shell.

[0009] As a further solution of the present invention, the sealing assembly includes a first seal and a second seal for sealing the gap between the retracted portion and the inner wall surface of the first shell, which are arranged between the outer wall surface of the retracted portion and the annular inner wall surface of the first shell; the distance between the second seal and the first side wall is smaller than the distance between the first seal and the first side wall.

[0010] As a further solution of the utility model, the first sealing member is a sealing ring, which abuts against the outer wall surface of the retracted portion and the annular inner wall surface of the first shell to form an extrusion seal; at least two sealing rings are arranged between the retracted portion and the first shell along the axial direction of the pipeline at equal intervals, and an injection hole for injecting a medium into the gap between the sealing rings is provided on the first shell or / and the retracted portion.

[0011] As a further solution of the utility model, the second sealing member is an airbag, which is fixed to the outer wall surface of the retracted portion and / or the annular inner surface of the first shell, and an inflation port for inflating the airbag is provided on the first shell and / or the retracted portion.

[0012] As a further solution of the utility model, an abutment groove is opened at the tail end of the shield machine, the first shell abuts in the abutment groove and a third seal is provided between the annular outer wall surface of the first shell and the annular inner wall surface of the abutment groove inner cavity.

[0013] As a further solution of the utility model, the third sealing member is a wire brush, and the annular inner wall surface of the abutment groove is installed with a plurality of circles of wire brushes, which are arranged at intervals in the axial direction of the pipeline, and a sealing medium is filled between two adjacent circles of wire brushes to form a seal.

[0014] As a further solution of the utility model, a first end of the wire brush is fixed to the inner cavity of the abutment groove, and the other end abuts against the outer surface of the first shell.

[0015] The utility model has the following beneficial effects:

[0016] The conversion ring in the utility model comprises a sealing shell, which comprises a first side wall, a second side wall and a push cylinder for adjusting the spacing between the first side wall and the second side wall. During top shield construction, the first side wall and the second side wall can be respectively connected to the shield machine and the pipeline. When the pipeline moves under the action of the propulsion device at its tail end, the push cylinder located in the installation chamber contracts synchronously, and the spacing length between the first side wall and the second side wall is shortened by the contraction of the push cylinder to offset the movement of the second side wall, so that the first side wall remains stationary when the pipeline moves. The shield machine abutting against the first surface of the first side wall will not move either. Therefore, the setback caused by uneven friction during the movement of the pipeline will not be transmitted to the shield machine. After the pipeline moves into place and stops, the pushing cylinder extends outward again. At this time, the pipeline cannot move. The pushing cylinder serves as the anti-support surface, so that the pushing cylinder can push the shield machine to move. The top shield construction is realized in this reciprocating manner. Through the buffering of the sealed shell, the impact force converted from the momentum when the rear pipeline is suddenly pushed can be avoided from acting on the shield machine, thereby avoiding damage to the shield machine caused by the impact force.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the use of the utility model.

[0020] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A.

[0022] Figure 4 It is a cross-sectional schematic diagram of the sealing shell in the utility model.

[0023] Legend:

[0024] 1. Thrust cylinder; 2. First shell; 21. First side wall; 3. Second shell; 31. Second side wall; 32. Retracted portion; 41. Sealing ring; 411. Injection hole; 42. Air bag; 421. Inflation port; 5. Abutment groove; 6. Wire brush. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0026] See also Figure 1-4 The utility model provides a conversion ring for top shield construction, which is used to be arranged between a shield machine and a pipeline during top shield construction. The conversion ring for top shield construction includes a sealing shell and a push cylinder 1. The sealing shell includes a first side wall 21 and a second side wall 31 that can move relatively. The first surface of the first side wall 21 and the first surface of the second side wall 31 are respectively abutted against the shield machine and the pipeline; the push cylinder 1 is arranged in the sealing shell, and the two ends of the push cylinder 1 are respectively fixed to the second surface of the first side wall 21 and the second surface of the second side wall 31;

[0027] Since the two ends of the push cylinder 1 are respectively fixed to the second surface of the first side wall 21 and the second surface of the second side wall 31, and the first side wall 21 and the second side wall 31 can move relatively in the axial direction of the pipeline, the distance between the first side wall 21 and the second side wall 31 can be controlled by the action of the push cylinder 1. During the top shield construction process, the sealing shell is arranged between the shield machine and the pipeline, and the first surface of the first side wall 21 and the first surface of the second side wall 31 are respectively abutted against the shield machine and the pipeline, and the distance between the shield machine and the pipeline can be adjusted by the action of the push cylinder 1.

[0028] like Figure 1-2 As shown, when the pipeline moves to the left under the action of the propulsion device at its tail end, the pushing cylinder 1 located in the installation chamber contracts synchronously. The contraction of the pushing cylinder 1 shortens the interval length between the shield machine and the pipeline to offset the movement of the second side wall 31. When the pipeline moves, the first side wall 21 remains stationary, and the corresponding shield machine abutting the first surface of the first side wall 21 will not move. Therefore, the setback caused by uneven friction during the movement of the pipeline will not be transmitted to the shield machine. After waiting for the pipeline to move into place and stop, the pushing cylinder 1 extends outward again. At this time, the pipeline cannot move. As the anti-support surface of the pushing cylinder 1, the pushing cylinder 1 can push the shield machine to the left. The moving distance of the shield machine is the same as the moving distance of the pipeline. After waiting for the shield machine to move into place, the pushing cylinder 1 stops. The top shield construction is realized in this reciprocating manner. Through the buffering of the sealing shell, the impact force converted from the momentum when the rear pipeline is suddenly pushed is avoided from acting on the shield machine, thereby avoiding damage to the shield machine caused by the impact force.

[0029] Specifically, the sealing shell includes a first shell 2, a second shell 3 and a sealing assembly. The first shell 2 and the second shell 3 are both opened on one side. One end of the opening of the second shell 3 is arranged in the opening of the first shell 2 so that the inner cavities of the first shell 2 and the second shell 3 are connected. The sealing assembly is provided at the part where the inner wall of the first shell 2 and the outer wall of the second shell 3 are gap-matched. The side walls of the inner cavities of the first shell 2 and the second shell 3 that are opposite in the axial direction of the pipeline are the first side wall 21 and the second side wall 31 respectively.

[0030] The sealing assembly seals the part where the inner wall of the first shell 2 and the outer wall of the second shell 3 are gap-matched, so that the part where the inner cavity of the first shell 2 and the inner cavity of the second shell 3 are interconnected forms a sealed chamber, which ensures that the first shell 2 and the second shell 3 can move relative to each other, while preventing gravel and muddy water on the excavation surface from entering the sealed chamber during the jacking process, thereby ensuring the safety of the jacking cylinder 1 installed in the sealed chamber.

[0031] Specifically, Figure 2 As shown, since there is a radial misalignment between the installation position of the push cylinder 1 and the surface of the pipeline used to contact the second side wall 31, a filling layer is provided in the second shell 3, and the filling layer is located between the push cylinder 1 and the second side wall 31 to increase the force-bearing area of ​​the push cylinder 1 and the force-bearing area of ​​the contact surface between the pipeline and the second side wall 31.

[0032] Specifically, the projection shape of the first shell 2 and the second shell 3 in the axial direction of the pipeline matches the cross-sectional shape of the pipeline, and a plurality of thrust cylinders 1 are provided in the inner cavities of the first shell 2 and the second shell 3. The plurality of thrust cylinders 1 are arranged along the cross-sectional contour line of the pipeline. The first shell 2 and the second shell 3 of different shapes are adopted according to different excavation shapes, so that the first shell 2 and the second shell 3 can support the excavation surface. At the same time, the arrangement shape of the plurality of thrust cylinders 1 installed in the first shell 2 and the second shell 3 matches the cross-sectional shape of the pipeline, so that the force of the thrust cylinders 1 can be evenly applied to the pipeline and the shield machine.

[0033] Figure 3 An installation example of the first shell 2 and the second shell 3 is shown. In this example, the first shell 2 and the second shell 3 are both in the shape of circular rings, and a number of thrust cylinders 1 are arranged at equal intervals along the circumference of the first shell 2 or the second shell 3 in the installation chamber. When the excavation shape of the shield machine is circular, the pipeline will also adopt a circular pipe. At this time, the first shell 2 and the second shell 3 also adopt circular rings accordingly. In this way, the thrust cylinders 1 can be arranged in a circle inside the first shell 2 and the second shell 3, so that the force of the thrust cylinders 1 can be evenly distributed on the contact surface between the shield machine and the first shell 2 and the contact surface between the pipeline and the second shell 3, preventing the shield machine or the pipeline from being damaged due to uneven force.

[0034] Specifically, Figure 2-3 As shown, the open end of the second shell 3 is formed with a retracted portion 32 for inserting into the opening of the first shell 2, so that the size of the portion of the second shell 3 that does not enter the first shell 2 can be the same as the size of the first shell 2, which is used to support the excavation surface and prevent the excavation surface from collapsing.

[0035] The sealing assembly includes a first seal and a second seal, which are arranged between the outer wall surface of the retracted portion 32 and the annular inner wall surface of the first shell 2 and are used to seal the gap between the retracted portion 32 and the inner wall surface of the first shell 2, and the spacing between the second seal and the first side wall 21 is smaller than the spacing between the first seal and the first side wall 21. The second seal is used to seal when the first seal fails to cope with sudden failure of the first seal, thereby ensuring the sealing safety of the inner cavities of the first shell 2 and the second shell 3.

[0036] Figure 3 An example of a first sealing member is shown. In this example, the first sealing member is a sealing ring 41, which is arranged between the outer wall surface of the retracted portion 32 and the annular inner wall surface of the first shell 2, and forms a seal by abutting against the outer wall surface of the retracted portion 32 and the annular inner wall surface of the first shell 2. A plurality of sealing rings 41 are arranged at equal intervals along the axial direction of the tube body between the outer wall surface of the retracted portion 32 and the annular inner wall surface of the first shell 2, such as Figure 3 As shown, three sealing rings 41 are arranged at equal intervals between the outer wall surface of the retracted portion 32 and the annular inner wall surface of the first shell 2, and an injection hole 411 is inserted on the retracted portion 32. The injection hole 411 connects the inner and outer wall surfaces of the retracted portion 32, and one end of the injection hole 411 extends into the gap between the sealing rings 41. Liquid medium such as grease is injected into the gap between the sealing rings 41 through the injection hole 411, so that a certain pressure is formed between the sealing rings 41 to resist the external water pressure during the top shield construction process and increase the sealing effect of the sealing ring 41.

[0037] Figure 3 An example of a second seal is shown. In this example, the second seal adopts an airbag 42, which is fixed on the outer surface of the retracted portion 32, and an inflation port 421 is installed on the retracted portion 32, which penetrates the inner and outer surfaces of the retracted portion 32. One end of the inflation port 421 is connected to the airbag 42. During normal use of the sealing ring 41, the airbag 42 is in a contracted state to reduce the wear of the airbag 42. When the sealing ring 41 fails and the seal fails, gas can be filled into the airbag 42 through the inflation port 421 to expand the airbag 42, so as to seal the outer wall surface of the retracted portion 32 and the annular inner wall surface of the first shell 2.

[0038] like Figure 2-3As shown, an abutment groove 5 is provided at the tail of the shield machine, and the first surface of the first side wall 21 abuts against the inner end surface of the abutment groove 5, so that the first shell 2 can partially enter the abutment groove 5, and then a wire brush 6 is installed on the annular inner wall surface of the abutment groove 5, one end of the wire brush 6 is fixed to the abutment groove 5, and the other end abuts against the outer surface of the first shell 2, and the wire brush 6 is installed with several circles on the annular inner surface of the abutment groove 5, and each circle of the wire brush 6 is composed of several wire brushes 6 arranged circumferentially along the annular inner wall surface of the abutment groove 5. During the construction of the top shield, firstly, viscous sealing grease is injected between every two adjacent circles of the wire brush 6 to seal the gap between the abutment groove 5 and the first shell 2, so as to prevent external mud and water from entering the shield machine and ensure the safe operation of the shield machine.

[0039] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A conversion ring for top shield construction, used to be arranged between a shield machine and a pipeline, characterized in that: The conversion ring for top shield construction comprises a sealing shell and a top thrust cylinder (1); The sealing shell comprises a first side wall (21) and a second side wall (31) which can move relative to each other in the axial direction of the tube body, and a first surface of the first side wall (21) and a first surface of the second side wall (31) are respectively in contact with the shield machine and the pipeline; The pushing oil cylinder (1) is arranged in a sealed housing, and two ends of the pushing oil cylinder (1) are respectively fixed to the second surface of the first side wall (21) and the second surface of the second side wall (31).

2. A conversion ring for top shield construction according to claim 1, characterized in that: The sealed shell comprises a first shell (2), a second shell (3) and a sealing assembly; the first shell (2) and the second shell (3) are both single-sided openings; one end of the opening of the second shell (3) is arranged in the opening of the first shell (2) so that the inner cavities of the first shell (2) and the second shell (3) are in communication; a sealing assembly is provided at a portion where the inner cavity wall of the first shell (2) and the outer wall of the second shell (3) are gap-matched; and the side walls of the inner cavities of the first shell (2) and the second shell (3) that are opposite in the axial direction of the pipeline are the first side wall (21) and the second side wall (31), respectively.

3. A conversion ring for top shield construction according to claim 2, characterized in that: The projection shapes of the first shell (2) and the second shell (3) in the axial direction of the pipeline match the cross-sectional shape of the pipeline, and a plurality of the push cylinders (1) are provided in the inner cavities of the first shell (2) and the second shell (3), and the plurality of push cylinders (1) are arranged along the contour line of the pipeline cross-section.

4. A conversion ring for top shield construction according to claim 2, characterized in that: The opening end of the second shell (3) is formed with an indented portion (32) for inserting into the opening of the first shell (2).

5. A conversion ring for top shield construction according to claim 4, characterized in that: The sealing assembly comprises a first sealing member and a second sealing member arranged between the outer wall surface of the retracted portion (32) and the annular inner wall surface of the first shell (2) and used for sealing the gap between the retracted portion (32) and the inner wall surface of the first shell (2); The distance between the second sealing member and the first side wall (21) is smaller than the distance between the first sealing member and the first side wall (21).

6. A conversion ring for top shield construction according to claim 5, characterized in that: The first sealing member is a sealing ring (41), and the sealing ring (41) abuts against the outer wall surface of the indented portion (32) and the annular inner wall surface of the first shell (2) to form an extrusion seal; At least two sealing rings (41) are arranged between the retracted portion (32) and the first shell (2) at equal intervals along the axial direction of the pipeline, and injection holes (411) for injecting a medium into the gap between the sealing rings (41) and the sealing rings (41) are provided on the first shell (2) or / and the retracted portion (32).

7. A conversion ring for top shield construction according to claim 5, characterized in that: The second sealing member is an airbag (42), which is fixed to the outer wall surface of the retracted portion (32) or / and the annular inner surface of the first shell (2), and an inflation port (421) for inflating air into the airbag (42) is provided on the first shell (2) or / and the retracted portion (32).

8. A conversion ring for top shield construction according to claim 3, characterized in that: An abutment groove (5) is provided at the rear end of the shield machine, the first shell (2) abuts against the abutment groove (5), and a third sealing member is provided between the annular outer wall surface of the first shell (2) and the annular inner wall surface of the inner cavity of the abutment groove (5).

9. A conversion ring for top shield construction according to claim 8, characterized in that: The third sealing member is a wire brush (6), and a plurality of circles of the wire brush (6) are installed on the annular inner wall surface of the abutting groove (5). The plurality of circles of the wire brush (6) are arranged at intervals in the axial direction of the pipeline, and a sealing medium is filled between two adjacent circles of the wire brush (6) to form a seal.

10. A conversion ring for top shield construction according to claim 9, characterized in that: The first end of the wire brush (6) is fixed to the inner cavity of the abutment groove (5), and the other end abuts against the outer surface of the first shell (2).

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