Frozen steel pipe segment

Abstract

The utility model relates to the technical field of shield construction, specifically relates to a frozen steel pipe piece, including annular main part and annular cell, the axis of annular main part is along first direction setting, annular cell is around in annular main part outside, the outer diameter of annular cell is matched with the outer diameter of shield pipe piece, at least two annular cells are continuously distributed along first direction, and the end face of adjacent two annular cells is provided with the communicating port of intercommunication, the side of annular main part of the annular cell at the most two ends along first direction is provided with liquid inlet and liquid outlet respectively. The utility model can overcome the technical problem that the existing frozen steel pipe piece cannot freeze the surrounding soil evenly and continuously, leading to the tail brush maintenance construction still facing the big security risk.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine (TBM) construction technology, and in particular to a frozen steel segment. Background Technology

[0002] During the operation of a tunnel boring machine (TBM), the tail brush inevitably suffers damage as the tunneling distance increases, thus requiring regular inspection and replacement. However, inspecting and replacing the tail brush requires removing the shield segments located along the long mileage direction of the tail brush, which significantly weakens the seal between the shield tail and the shield segments. Therefore, existing technologies often replace the shield segments at the tail brush with frozen steel segments before inspecting the tail brush, in order to freeze and reinforce the soil around the tail brush, thereby enhancing the bearing capacity of the surrounding soil and reducing the risk of leakage.

[0003] Existing frozen steel segments generally consist of an annular body and liquid pipelines. The annular body can replace the original shield tunnel segments to support the tunnel structure and transmit the thrust of the shield machine. The liquid pipelines are laid inside the annular body. After liquid nitrogen or low-temperature brine is introduced into the liquid pipelines, the annular body can be cooled down, and then the cooled annular body can cool the surrounding soil. However, the circular cross-section of the liquid pipelines cannot make full contact with the inner wall of the annular body. Therefore, even if the liquid pipelines are densely laid inside the annular body, only a discontinuous linear cooling range can be formed on the outer side of the annular body. This results in the annular body not being able to freeze the surrounding soil evenly, leading to poor continuity of the frozen soil curtain. Tail brush maintenance and construction still face significant safety hazards. Therefore, there is an urgent need to develop a frozen steel segment with a more uniform and continuous freezing effect. Utility Model Content

[0004] The purpose of this invention is to overcome the technical problem that existing frozen steel pipe segments cannot freeze the surrounding soil evenly and continuously, resulting in significant safety hazards during tail brush maintenance and construction, and to provide a frozen steel pipe segment.

[0005] In a first aspect, the present invention provides a frozen steel tunnel segment, comprising an annular body and an annular cavity, wherein the axis of the annular body is arranged along a first direction, the annular cavity surrounds the outer side of the annular body, and the outer diameter of the annular cavity matches the outer diameter of the shield tunnel segment; at least two annular cavities are continuously distributed along the first direction, and a communication port is provided on the adjacent end face of two adjacent annular cavities; an inlet and a outlet are respectively provided on the side of the annular cavities located at the two ends along the first direction facing the annular body.

[0006] Preferably, a reserved pipe is also provided in the annular cavity. One end of the reserved pipe passes through the outer wall of the annular cavity, and the other end of the reserved pipe passes through the inner wall of the annular cavity and extends to the inner side of the annular body. A valve is connected to the end of the reserved pipe away from the annular cavity.

[0007] Preferably, the end of the reserved pipe away from the valve is covered with a cover plate, which can be opened unidirectionally towards the outside of the annular cavity.

[0008] Preferably, the portion of the reserved pipe located inside the annular cavity has a segmented structure.

[0009] Preferably, the number of reserved pipes is at least two, and the reserved pipes are distributed at intervals along the circumference of the annular cavity.

[0010] Preferably, the number of annular cavities is at least three, and the positions of two adjacent connecting ports are staggered along the circumference of the annular body.

[0011] Preferably, the annular cavity is divided into at least two arc-shaped segments along its circumference. Each arc-shaped segment is provided with end baffles at both ends along the circumference of the annular body. Two adjacent arc-shaped segments along the first direction are connected to each other through a connecting port. The arc-shaped segments at the two ends along the first direction are respectively provided with a liquid inlet and a liquid outlet on the side facing the annular body.

[0012] Preferably, the annular body includes a grid structure, the grid structure includes at least two annular steel plates, the annular steel plates are coaxially arranged with the annular cavity, the annular steel plates are spaced apart along a first direction, and a number of longitudinal steel plates are connected between two adjacent annular steel plates, the longitudinal steel plates are spaced apart along the circumference of the annular steel plates.

[0013] Preferably, the inner side of the annular body is covered with thermal insulation material.

[0014] Preferably, a sealing ring is also provided on the outer end face of the annular cavities located at the two ends along the first direction.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a freezing steel pipe segment. By continuously setting at least two annular cavities on the outer side of the annular body, and setting liquid inlet and outlet on the annular cavities at the two ends, and connecting two adjacent annular cavities through a connecting port, after the cooling medium is introduced into the annular cavities, the cooling medium can flow along the inner surface of the annular cavities over a large area, thereby forming a uniform and continuous annular cooling surface on the outer surface of each annular cavity. This allows for more uniform freezing of the surrounding soil, forming a frozen soil curtain with better continuity, and ensuring the safety of tail brush maintenance construction. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a frozen steel pipe segment according to the present invention. Figure 1 ; Figure 2 This is a front view structural diagram of a frozen steel pipe segment according to this utility model; Figure 3 yes Figure 2 A schematic diagram of the partial cross-sectional structure of section AA in the middle; Figure 4 This is a three-dimensional structural diagram of a frozen steel pipe segment according to this utility model. Figure 2 ; Figure 5 This is a partial three-dimensional structural diagram of a frozen steel pipe segment according to this utility model. Figure 1 ; Figure 6 This is a partial three-dimensional structural diagram of a frozen steel pipe segment according to this utility model. Figure 2 ; Figure 7 yes Figure 2 A partial cross-sectional view of the structure at point B in the middle section; icon: 100 - Ring-shaped main body; 101 - Ring-shaped steel plate; 102 - Longitudinal steel plate; 200-Annular partition; 210-Arc-shaped segment; 201-Connecting port; 202-Liquid inlet; 203-Liquid outlet; 204-End partition; 205-Arc-shaped partition; 206-Sealing ring; 300 - Reserved piping; 301 - Valve; 302 - Cover plate; 303 - Flange; 400 - Thermal insulation material; 500-Shield tunnel segment. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0018] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0020] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0021] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0022] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0023] Example 1 like Figures 1 to 7 As shown, a freezing steel pipe segment includes an annular body 100 and an annular cavity 200; the axis of the annular body 100 is along a first direction (i.e., Figure 1 , Figures 3 to 5The annular cavity 200 is arranged in the direction indicated by the middle arrow X, and is coaxially surrounding the outside of the annular body 100 (the side closer to the soil). The outer diameter of the annular cavity 200 matches the outer diameter of the shield segment 500. At least two annular cavities 200 are continuously distributed along the first direction. The adjacent end faces (two adjacent faces along the first direction) of two adjacent annular cavities 200 are provided with interconnected communication ports 201. The annular cavity 200 located at one end of the annular body 100 along the first direction is provided with a liquid inlet 202 on the side facing the annular body 100. The annular cavity 200 located at the other end of the annular body 100 along the first direction is provided with a liquid outlet 203 on the side facing the annular body 100. Cooling medium is introduced into one of the annular cavities 200 from the liquid inlet 202. The cooling medium can pass through each annular cavity 200 in sequence and be discharged from the liquid outlet 203 of the annular cavity 200 at the other end.

[0024] For example Figure 3 As shown, three annular cavities 200 are continuously arranged along the first direction. The rightmost annular cavity 200 has an inlet 202 on the side facing the annular body 100, while the leftmost annular cavity 200 has an outlet 203 on the side facing the annular body 100. Figure 3 (Not visible in the image) When in use, cooling medium is introduced into the rightmost annular cavity 200 through the inlet 202. The cooling medium will first flow in an annular pattern within the rightmost annular cavity 200 until it enters the middle annular cavity 200 through the connecting port 201, where it also flows in an annular pattern until it enters the leftmost annular cavity 200 through the connecting port 201, where it also flows in an annular pattern until it is discharged from the annular cavity through the outlet 203. By continuously introducing cooling medium into the rightmost annular cavity 200 through the inlet 202 using a water pump, the cooling medium can be continuously flowed through each annular cavity 200 in sequence, thereby freezing the soil in the corresponding area.

[0025] Compared to the scheme of laying liquid pipelines inside the annular body 100 (the side closest to the center of the tunnel), this embodiment sets an annular cavity 200 on the outside of the annular body 100. After the cooling medium is introduced into it, the cooling medium can flow along the inner surface of the annular cavity 200 over a large area, thereby forming a uniform and continuous annular cooling surface on the outer surface of each annular cavity 200. This allows for more uniform freezing of the surrounding soil, forming a more continuous frozen soil curtain and ensuring the safety of tail brush maintenance construction.

[0026] Furthermore, considering that the frozen steel tube sheet has a large dimension along the first direction, if only one large chamber is set up, it will be difficult to increase the flow velocity of the cooling medium, which will easily lead to phenomena such as laminar flow, turbulent flow, and flow dead zones, which will reduce the cooling efficiency. Therefore, this embodiment selects to set at least two annular cavities 200 along the first direction, and uses a connecting port 201 to connect two adjacent annular cavities 200 to each other. This can ensure that the cooling medium flows through the entire frozen steel tube sheet along the first direction, and can also reduce the cross-sectional area of ​​a single annular cavity 200, thereby ensuring that the cooling efficiency of the cooling medium can meet the freezing requirements.

[0027] In optional embodiments, each annular cavity 200 can be an independent annular component, or it can be obtained by dividing a larger cavity with a partition; for example... Figure 3 As shown, by inserting two arc-shaped partitions 205 at intervals along the first direction into a larger chamber, three annular cavities 200 can be obtained.

[0028] In optional embodiments, the cooling medium includes, but is not limited to, liquid nitrogen or brine.

[0029] In optional implementations, such as Figure 5 As shown, the number of liquid inlets 202 is at least two, which helps to reduce the cross-sectional area of ​​a single liquid inlet 202 and the corresponding conveying pipe, increase the flow rate of the cooling medium, thereby improving the conveying efficiency of the cooling medium and reducing the difficulty of pipe layout; correspondingly, the number of liquid outlets 203 can also be set to at least two.

[0030] In an optional embodiment, a reserved pipe 300 is also provided inside the annular cavity 200. One end of the reserved pipe 300 passes through the outer wall of the annular cavity 200 (the side closer to the soil), and the other end of the reserved pipe 300 passes through the inner wall of the annular cavity 200 (the side closer to the center of the tunnel) and extends to the inner side of the annular body 100. A valve 301 is connected to the end of the reserved pipe 300 away from the annular cavity 200.

[0031] To detect the freezing effect and perform emergency grouting, existing technologies often drill radial holes in the annular body 100. However, since this embodiment has an annular cavity 200 on the outside of the annular body 100, direct drilling would cause leakage in the annular cavity 200. Therefore, this embodiment provides a reserved pipe 300 connected to a valve 301 inside the annular cavity 200. The interior of the reserved pipe 300 is separated from the interior of the annular cavity 200 by the side wall of the reserved pipe 300. Therefore, the cooling medium flowing inside the annular cavity 200 will not enter the tunnel through the reserved pipe 300. When it is necessary to detect the freezing effect or perform emergency grouting, the valve 301 can be opened to grout the soil outside the annular body 100 or insert a sensor through the reserved pipe 300. After use, the valve 301 can be closed to restore the tunnel's airtightness.

[0032] In an optional implementation, valve 301 may be an existing product, including but not limited to gate valves, butterfly valves, or ball valves.

[0033] In optional implementations, such as Figure 7 As shown, the end of the reserved pipe 300 away from the valve 301 is covered with a cover plate 302. The cover plate 302 can be opened unidirectionally to the outside of the annular cavity 200, so that groundwater outside the annular cavity 200 cannot enter the reserved pipe 300, but slurry or sensors can reach the outside of the annular cavity 200 from the reserved pipe 300, thereby ensuring the safety of the tunnel interior environment.

[0034] In alternative embodiments, the one-way opening of the cover 302 can be achieved by various existing products or structures; for example, a reusable one-way valve, or a disposable rubber stopper, wooden stopper, or tape.

[0035] In an optional embodiment, the portion of the reserved pipe 300 located inside the annular cavity 200 has a segmented structure.

[0036] like Figure 7 As shown, to facilitate subsequent grouting or testing, the end of the reserved pipe 300 away from the annular cavity 200 extends into the inner side of the annular body 100, which may hinder the transportation and installation of the frozen steel pipe segments. Therefore, in this embodiment, the reserved pipe 300 is designed as a segmented structure. During transportation and installation, some segments can be removed to avoid the reserved pipe 300 from hindering the transportation and installation. After the frozen steel pipe segments are installed, the segments are reconnected to each other to increase the length of the reserved pipe 300, which facilitates subsequent grouting or testing.

[0037] In optional embodiments, the connection methods between the 300 sections of the reserved pipe include, but are not limited to, welding, threaded connection, or snap-fit ​​connection; for example... Figure 7 As shown, the reserved pipe 300 is divided into two sections, and the two adjacent sections are connected to each other by flange 303.

[0038] In an optional implementation, the number of reserved pipes 300 is at least two, and the reserved pipes 300 are distributed at intervals along the circumference of the annular cavity 200 to better meet the grouting and testing requirements.

[0039] In an optional embodiment, the number of annular cavities 200 is at least three, and the positions of two adjacent connecting ports 201 are staggered along the circumference of the annular body 100; for example, in the case where there are three annular cavities 200 and two connecting ports 201, the phase angles of the two connecting ports 201 can be 0° and 180° respectively.

[0040] This embodiment enables the cooling medium to... Figure 6As shown, the flow in each annular cavity 200 is S-shaped, thereby improving the uniformity of the cooling medium flow and avoiding flow short circuits, such as when two adjacent connecting ports 201 are aligned with each other, causing the cooling medium to continuously pass through at least two connecting ports 201 and skip the annular cavity 200 between the two connecting ports 201; thus ensuring the uniformity of the freezing effect of the annular cavity 200 on the soil.

[0041] In optional implementations, such as Figures 4 to 5 As shown, the annular cavity 200 is divided into at least two arc-shaped segments 210 along its circumference. Each arc-shaped segment 210 is provided with end baffles 204 at both ends along the circumference of the annular body 100, so that the cooling medium cannot be connected between two adjacent arc-shaped segments 210 along the circumference of the annular body 100. Two adjacent arc-shaped segments 210 along the first direction are connected to each other through a connecting port 201. Each arc-shaped segment 210 located at one end of the annular body 100 along the first direction is provided with a liquid inlet 202 on the side facing the annular body 100, and each arc-shaped segment 210 located at the other end of the annular body 100 along the first direction is provided with a liquid outlet 203 on the side facing the annular body 100.

[0042] For example Figure 3 The image shows a frozen steel tube sheet comprising three annular cavities 200. If the annular cavities 200 are not segmented, the cooling medium must flow from the rightmost annular cavity 200 to the leftmost annular cavity 200 in one continuous flow, with a total flow distance of approximately three times the circumference of the annular cavity 200.

[0043] And for such Figure 2 and Figure 4 As shown, each annular cavity 200 is divided into six arc-shaped segments 210 with a central angle of 60° along its circumference. Since each arc-shaped segment 210 is separated from the others by end partitions 204 along the circumference of the annular cavity 200, and each arc-shaped segment 210 is interconnected by a connecting port 201 along the first direction, and each arc-shaped segment 210 at both ends is respectively provided with an inlet 202 and a outlet 203; therefore, for the cooling medium, the three annular cavities 200 are equivalent to being divided into six cooling units, each cooling unit as follows... Figure 5 The diagram shows three arc-shaped segments 210 with a central angle of 60°, as well as independent liquid inlets 202 and outlets 203, which reduces the flow distance of the cooling medium in each cooling unit to half the circumference of the annular cavity 200.

[0044] As can be seen from the above, this embodiment can significantly reduce the flow distance of the cooling medium from the inlet 202 to the outlet 203, thereby reducing the flow resistance of the cooling medium, enabling the cooling medium to flow at a higher speed and improving cooling efficiency; and reducing the temperature difference of the cooling medium at the inlet 202 and the outlet 203, thus achieving a more uniform cooling effect in this embodiment.

[0045] It is important to note that Figure 2 and Figure 4 The segmentation method described is merely one example. The actual segmentation method of the annular cavity 200 can be adjusted according to the actual construction conditions on site (e.g., to match the segmentation of the shield tunnel segment 500). Furthermore, the normal to the interface between two adjacent arc-shaped segments 210 can be parallel to the tangent of the annular cavity 200 or inclined to the tangent of the annular cavity 200. And... Figures 4 to 6 The outer wall of the annular cavity 200 was concealed to allow observation of the arc-shaped partition 205 and the end partition 204.

[0046] In an optional embodiment, the annular body 100 includes a grid structure, the grid structure including at least two annular steel plates 101, the annular steel plates 101 being coaxially arranged with the annular cavity 200, the annular steel plates 101 being spaced apart along a first direction, and a plurality of longitudinal steel plates 102 being connected between two adjacent annular steel plates 101, the normal of the longitudinal steel plates 102 being parallel to the tangent of the annular steel plates 101, and the longitudinal steel plates 102 being spaced apart along the circumference of the annular steel plates 101.

[0047] This embodiment ensures that the annular body 100 has sufficient strength and rigidity to support the tunnel structure and transmit the thrust of the tunnel boring machine.

[0048] In an optional embodiment, the inner side of the annular body 100 is covered with thermal insulation material 400 to suppress heat exchange between the annular body 100 and the tunnel interior environment; for example, when the annular body 100 includes a grid structure, the thermal insulation material 400 can be filled in the grid structure until the inner side of the grid structure is completely covered by the thermal insulation material 400 without any exposed surface; the thermal insulation material 400 can be selected from existing products, including but not limited to fast-setting cement, aerogel or polystyrene foam.

[0049] It is important to note that Figures 1 to 2 ,as well as Figures 4 to 7 The insulation material 400 was concealed to reveal the grid structure or the reserved pipe 300.

[0050] In an optional embodiment, a sealing ring 206 is also provided on the outer end face of the annular cavity 200 located at both ends along the first direction (the side away from the center of the frozen steel pipe segment along the first direction) to improve the sealing effect between the frozen steel pipe segment and the adjacent shield pipe segment 500 and further reduce the risk of tunnel leakage.

[0051] It should be noted that because the actual size of the sealing ring 206 is relatively small, therefore Figure 3 The sealing ring 206 was artificially enlarged to better observe its position.

[0052] The above content is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A method for freezing steel pipe segments, comprising an annular body (100), the axis of the annular body (100) being arranged along a first direction, characterized in that, Also includes: An annular cavity (200) surrounds the outer side of the annular body (100). The outer diameter of the annular cavity (200) matches the outer diameter of the shield segment (500); at least two annular cavities (200) are continuously distributed along the first direction, and a communication port (201) is provided on the adjacent end face of two adjacent annular cavities (200); the annular cavities (200) located at the two ends along the first direction are respectively provided with a liquid inlet (202) and a liquid outlet (203) on the side facing the annular body (100).

2. The frozen steel pipe segment according to claim 1, characterized in that, The annular cavity (200) is also provided with a reserved pipe (300). One end of the reserved pipe (300) passes through the outer wall of the annular cavity (200), and the other end of the reserved pipe (300) passes through the inner wall of the annular cavity (200) and extends to the inner side of the annular body (100). A valve (301) is connected to the end of the reserved pipe (300) away from the annular cavity (200).

3. The frozen steel pipe segment according to claim 2, characterized in that, The end of the reserved pipe (300) away from the valve (301) is covered with a cover plate (302), which can be opened unidirectionally to the outside of the annular cavity (200).

4. A frozen steel pipe segment according to claim 2, characterized in that, The portion of the reserved pipe (300) located inside the annular cavity (200) has a segmented structure.

5. A frozen steel pipe segment according to claim 2, characterized in that, The number of the reserved pipes (300) is at least two, and the reserved pipes (300) are distributed circumferentially along the annular cavity (200).

6. A frozen steel segment according to any one of claims 1 to 5, characterized in that, The number of the annular cavities (200) is at least three, and the positions of two adjacent connecting ports (201) are staggered from each other along the circumference of the annular body (100).

7. A frozen steel pipe segment according to any one of claims 1 to 5, characterized in that, The annular cavity (200) is divided into at least two arc-shaped segments (210) along its circumference. Each arc-shaped segment (210) is provided with an end partition (204) at both ends along the circumference of the annular body (100). Two adjacent arc-shaped segments (210) along the first direction are connected to each other through the connecting port (201). The arc-shaped segments (210) located at the two ends along the first direction are respectively provided with the liquid inlet (202) and the liquid outlet (203) on the side facing the annular body (100).

8. A frozen steel pipe segment according to any one of claims 1 to 5, characterized in that, The annular body (100) includes a grid structure, which includes at least two annular steel plates (101). The annular steel plates (101) are coaxially arranged with the annular cavity (200). The annular steel plates (101) are spaced apart along a first direction. A plurality of longitudinal steel plates (102) are connected between two adjacent annular steel plates (101). The longitudinal steel plates (102) are spaced apart along the circumference of the annular steel plates (101).

9. A frozen steel pipe segment according to any one of claims 1 to 5, characterized in that, The inner side of the annular body (100) is covered with thermal insulation material (400).

10. A frozen steel segment according to any one of claims 1 to 5, characterized in that, A sealing ring (206) is also provided on the outer end face of the annular cavities (200) located at the two ends along the first direction.

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