Shield segment separated cavity pouring method and subsea tunnel segment structure

Abstract

The invention relates to the field of subsea tunnels, in particular to a shield segment separated cavity pouring method and a subsea tunnel segment construction.The method comprises the following steps that S1, before a shield tunneling machine is provided with a steel pipe piece, lacing wires are arranged in separated cavities of the steel pipe piece, and concrete is poured into the separated cavities to form a filling body; the filling body, the pipe piece inner plate of the steel pipe piece and the opening of the partition cavity form step matching anchoring, the filling body anchors the tie bar, and the tie bar extends out of the opening of the partition cavity into the secondary lining boundary; s2, steel pipe pieces are installed in place through a shield tunneling machine; and S3, tie bars are bound and connected with a reinforcement cage of the secondary lining, and the secondary lining is poured for forming. According to the method, the filling bodies are connected into the separation cavities in a limiting fit mode, the filling bodies are connected with the tie bars in an anchoring mode, the tie bars are connected with the secondary lining, operation is easy, and the accessory preparation difficulty and the construction operation difficulty are greatly reduced; and after the shield tunneling machine installs the steel pipe sheet in place, the secondary lining can be quickly constructed, and the operation time in the tunnel is shortened.

Description

Technical Field

[0001] This invention relates to the field of submarine tunnels, and in particular to a method for casting shield tunnel segments with cavities and a submarine tunnel segment structure. Background Technology

[0002] When constructing large industrial facilities in coastal areas, such as nuclear power plants, thermal power plants, large data centers, or desalination plants, a large amount of cooling water is typically required to maintain their continuous and safe operation. Seawater, with its stable low temperature and abundant supply, is an ideal cooling medium. To achieve efficient intake and discharge of cooling water, an increasingly widely used technical solution is to construct an undersea intake and discharge system. This involves excavating undersea tunnels as water passages to connect shore-based facilities to the open sea. Undersea tunnels can be constructed using the shield tunneling method.

[0003] like Figure 1 As shown, since the undersea tunnel needs to connect to the sea area via a riser, a full-ring steel segment 1 is used at the riser location. The tunnel boring machine installs the outer ring of the steel segment 1 of the undersea tunnel, and then the secondary lining 2 is constructed on the inner side of the installed steel segment 1. Figure 2 As shown, the steel segment 1 includes a segment back plate 12 located on the outer side. Several ribs 13 are welded to the inner side of the segment back plate 12 in a grid pattern. An inner segment plate 11 is welded to the top of each rib 13. A cavity 14 is formed between the inner segment plate 11, the ribs 13, and the segment back plate 12. The inner segment plate 11 is also in a grid pattern and has a cavity opening 111 connecting to the cavity 14. In actual construction, some waste residue and debris often fall into the cavity 14, filling it during the subsequent pouring of the secondary lining 2. This waste residue and debris seriously affect the pouring quality and the connection quality between the secondary lining 2 and the steel segment 1.

[0004] In existing technologies, after the tunnel boring machine (TBM) installs the steel segment 1 in place, shotcrete is typically used to fill and seal the cavity 14 to prevent waste and debris from entering. The specific construction method is as follows: Figure 2 As shown, a steel mesh 3 is welded inside the cavity opening 111, and the steel mesh 3 is welded to the rib plate 13; as Figure 3 As shown, a tie rod 4 is installed in the cavity 14. One end of the tie rod 4 is a first elbow 41, and the other end is connected to a connector 5. The first elbow 41 is welded to the back plate 12 of the pipe segment. The connector 5 is fixed to the steel mesh 3 and the connection hole is sealed with a wooden plug or plastic plug. Shotcrete fills the cavity 14 to form a filler 6. The filler 6 wraps the tie rod 4 and the connector 5 and covers the cavity opening 111. Then the wooden plug or plastic plug is removed, and the steel bars are connected through the connector 5 to connect and fix the steel cage of the secondary lining 2.

[0005] It can be seen that the existing shield tunnel segment cavity casting method involves steel mesh 3, tie rod 4, connector 5, and welding operations, which are complicated and difficult to implement. Summary of the Invention

[0006] The purpose of this invention is to address the problems of existing shield tunnel segment cavity casting methods, which involve the application of steel mesh, tie rods, and connectors, as well as welding operations, resulting in complex operations and high construction difficulty. This invention provides a shield tunnel segment cavity casting method and a submarine tunnel segment structure.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a method for casting cavity in tunnel lining segments, comprising the following steps: S1. Before the tunnel boring machine installs the steel pipe segments, tie bars are first installed in the cavity of the steel pipe segments and concrete is poured to form a filling body. The filling body forms a stepped fit and anchors with the inner plate of the steel pipe segments and the cavity opening. The filling body anchors the tie bars, and the tie bars extend from the cavity opening to the boundary of the secondary lining. S2. The steel pipe segments are installed into place using the tunnel boring machine; S3. The tie rod is tied to the steel cage of the secondary lining, and the secondary lining is cast to form the shape.

[0008] The shield tunnel segment cavity casting method described in this invention uses a filling body that is limited and connected within the cavity. The filling body is anchored to the tie rod, which in turn connects to the secondary lining. This eliminates the need for steel mesh and pre-embedded connectors to connect the tie rod, and also eliminates the need for secondary steel reinforcement to connect the connectors and the secondary lining's steel cage. The tie rod can be cast without welding, simplifying the operation and significantly reducing the difficulty of component preparation and construction. Before the shield machine installs the steel segments, the steel segments, filling body, and tie rods form a unified whole. After the shield machine installs the steel segments, the secondary lining can be constructed quickly, shortening the operation time within the tunnel. This method is simple, convenient, and effective.

[0009] As a preferred embodiment of the present invention, one end of the tie rod located within the cavity is a first elbow, and the filler body wraps around and anchors the first elbow; or the first elbow is welded to the back plate of the steel pipe segment, and the filler body anchors the first elbow.

[0010] As a preferred technical solution of the present invention, the end of the tie rod located within the boundary of the secondary lining is a second bend.

[0011] As a preferred embodiment of the present invention, the concrete grade of the filling material is the same as that of the secondary lining.

[0012] As a preferred embodiment of the present invention, a plurality of ribs are welded between the inner plate of the tube segment and the back plate of the steel tube segment, and the ribs are configured in a grid form to form the cavity.

[0013] Secondly, the present invention also provides a subsea tunnel segment structure, including shield steel segments. The outer side of the steel segment is provided with a segment back plate and the inner side is provided with a segment inner plate. A plurality of ribs are welded between the segment inner plate and the segment back plate. The ribs are arranged in a grid pattern. A cavity is formed between the segment inner plate, the ribs and the segment back plate. The segment inner plate is provided with a cavity opening. The cavity opening communicates with the cavity. Tie bars are provided in the cavity. The tie bars extend from the cavity opening to the boundary of the secondary lining. The cavity is filled with concrete to form a filler. The filler is anchored in a stepped fit with the segment inner plate and the cavity opening. The filler anchors the tie bars.

[0014] The subsea tunnel segment structure described in this invention connects the infill body within the cavity solely through a limiting fit. The infill body is anchored to the tie rod, which is used to connect the secondary lining. This eliminates the need for steel mesh and pre-embedded connectors to connect the tie rod, and also eliminates the need for secondary steel reinforcement to connect the connectors and the steel cage of the secondary lining. The tie rod can be installed without welding, simplifying operation and significantly reducing the difficulty of component preparation and construction. This structure is simple, convenient to use, and yields excellent results.

[0015] As a preferred technical solution of the present invention, the subsea tunnel segment structure further includes a secondary lining, wherein the steel reinforcement cage of the secondary lining is tied to the tie bar, and the secondary lining wraps around the tie bar outside the steel segment.

[0016] As a further preferred embodiment of the present invention, the concrete grade of the filling material is the same as that of the secondary lining.

[0017] As a preferred embodiment of the present invention, the two ends of the tie rod are a first bend and a second bend, the first bend being located within the cavity and the second bend being located within the boundary of the secondary lining.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The shield tunnel segment cavity casting method of the present invention only requires the filling body to be connected to the cavity through limiting fit. The filling body is anchored to the tie rod, and the tie rod is connected to the secondary lining. It does not require the setting of steel mesh and pre-embedded connectors to connect the tie rod, nor does it require secondary steel reinforcement to connect the connectors and the steel cage of the secondary lining. The tie rod does not require welding. The operation is simple and greatly reduces the difficulty of component preparation and construction. Before the shield machine installs the steel segment, the steel segment, the filling body and the tie rod form an integral whole. After the shield machine installs the steel segment in place, the secondary lining can be constructed quickly, shortening the operation time in the tunnel. The method is simple in steps, convenient in operation and has good effect. 2. The subsea tunnel segment structure of the present invention is connected to the cavity only by the limiting fit of the filling body. The filling body is anchored to the tie rod, which is used to connect the secondary lining. It does not require the setting of steel mesh and pre-embedded connectors to connect the tie rod, nor does it require secondary steel reinforcement to connect the connectors and the steel cage of the secondary lining. The tie rod does not require welding, which is simple to operate and greatly reduces the difficulty of component preparation and construction. The structure is simple, easy to use, and has good effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram (cross-section) of the segment structure of an undersea tunnel. Figure 2 A schematic diagram of the existing shield tunnel segment cavity casting method. Figure 1 ; Figure 3 A schematic diagram of the existing shield tunnel segment cavity casting method. Figure 2 ; Figure 4 This is a schematic diagram of the shield tunnel segment cavity casting method of this application. Figure 1 ; Figure 5 This is a schematic diagram of the shield tunnel segment cavity casting method of this application. Figure 2 .

[0020] Marked in the image: 1-Steel segment, 11-Inner plate of segment, 111-Cavity opening, 12-Back plate of segment, 13-Rib plate, 14-Cavity; 2-Secondary lining; 3-Steel mesh; 4-Stretcher, 41-First bend, 42-Second bend; 5-Connector; 6-Infill material. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter 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.

[0022] 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 the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention 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 particular 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 the present invention.

[0023] 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 that it 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.

[0024] 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.

[0025] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0026] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided 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.

[0027] In related technologies, after the tunnel boring machine (TBM) installs the steel segment 1 in place, shotcrete is typically used to fill and seal the cavity 14 to prevent waste and debris from entering. The specific construction method is as follows: Figure 2 As shown, a steel mesh 3 is welded inside the cavity opening 111, and the steel mesh 3 is welded to the rib plate 13; as Figure 3 As shown, a tie rod 4 is installed in the cavity 14. One end of the tie rod 4 is a first elbow 41, and the other end is connected to a connector 5. The first elbow 41 is welded to the back plate 12 of the tunnel segment. The connector 5 is fixed to the steel mesh 3 and the connection hole is sealed with a wooden plug or plastic plug. Shotcrete fills the cavity 14 to form a filler 6. The filler 6 wraps the tie rod 4 and the connector 5 and covers the cavity opening 111. Then the wooden plug or plastic plug is removed, and the steel bars are connected through the connector 5 to connect and fix the steel cage of the secondary lining 2. It can be seen that the existing shield tunnel segment cavity pouring method involves steel mesh 3, tie rod 4, connector 5, and welding operations, which is complicated and difficult to construct. Therefore, the technical solution of this application was developed. The following is combined with Figures 4 to 5 To elaborate.

[0028] Example 1 like Figure 4 and Figure 5 As shown, the shield tunnel segment cavity casting method of the present invention includes the following steps: S1. Manufacture the steel tube segment 1, the steel tube segment 1 including an inner plate 11, a back plate 12, ribs 13 and a cavity 14; a plurality of ribs 13 are welded between the inner plate 11 and the back plate 12, the ribs 13 being configured in a grid form to form the cavity 14.

[0029] like Figure 4As shown, before the tunnel boring machine installs the steel pipe segment 1, it first sets the tie rod 4 in the cavity 14 and pours concrete to form the filling body 6. The concrete grade of the filling body 6 is the same as that of the subsequent secondary lining 2. The filling body 6 forms a stepped fit and anchors with the inner plate 11 of the steel pipe segment 1 and the cavity opening 111. The filling body 6 anchors the tie rod 4, and the tie rod 4 extends out of the cavity opening 111 to the boundary of the secondary lining 2.

[0030] In some specific embodiments, the end of the tie rod 4 located within the cavity 14 is a first bend 41, and the end of the tie rod 4 located within the boundary of the secondary lining 2 is a second bend 42. The filler 6 wraps around and anchors the first bend 41; or the first bend 41 is welded to the back plate 12 of the steel pipe segment 1, and the filler 6 anchors the first bend 41.

[0031] S2. The steel pipe segment 1 is installed in place by the tunnel boring machine.

[0032] S3, such as Figure 5 As shown, the tie bar 4 is tied to the steel cage of the secondary lining 2, and the secondary lining 2 is cast to form the structure; the second bend 42 can increase the number of tying points and improve the connection performance between the tie bar 4 and the secondary lining 2.

[0033] The shield tunnel segment cavity casting method described in this embodiment only requires the filling body 6 to be connected to the cavity 14 through limiting and fitting. The filling body 6 is anchored to the tie rod 4, and the tie rod 4 is connected to the secondary lining 2. It does not require the setting of steel mesh 3 and pre-embedded connectors 5 to connect the tie rod 4, nor does it require secondary steel reinforcement to connect the connectors 5 and the steel cage of the secondary lining 2. The tie rod 4 does not require welding, which simplifies the operation and greatly reduces the difficulty of component preparation and construction. Before the shield machine installs the steel segment 1, the steel segment 1, the filling body 6 and the tie rod 4 form an integral whole. After the shield machine installs the steel segment 1 in place, the secondary lining 2 can be constructed quickly, shortening the operation time in the tunnel. This method is simple in steps, convenient in operation and has good results.

[0034] Example 2 like Figure 4 and Figure 5 As shown, the present invention provides a subsea tunnel segment structure, including shield steel segments 1.

[0035] like Figure 4As shown, the outer side of the steel tube segment 1 is provided with a tube segment back plate 12 and the inner side is provided with a tube segment inner plate 11. A plurality of ribs 13 are welded between the tube segment inner plate 11 and the tube segment back plate 12. The ribs 13 are configured in a grid form, and a cavity 14 is formed between the tube segment inner plate 11, the ribs 13 and the tube segment back plate 12.

[0036] The inner plate 11 of the tube segment is provided with a cavity opening 111, the cavity opening 111 communicating with the cavity 14, and a tie rod 4 is provided in the cavity 14. The tie rod 4 extends from the cavity opening 111 to the boundary of the secondary lining 2, such as... Figure 4 As shown, the cavity 14 is filled with concrete to form a filler 6. The filler 6 forms a stepped fit and anchors with the inner plate 11 of the segment and the cavity opening 111. The filler 6 anchors the tie rod 4.

[0037] In one specific implementation, such as Figure 5 As shown, the subsea tunnel segment structure also includes a secondary lining 2, the steel cage of the secondary lining 2 is tied to the tie bar 4, and the secondary lining 2 wraps around the tie bar 4 outside the steel segment 1.

[0038] In one specific embodiment, the concrete grade of the filler 6 is the same as that of the secondary lining 2.

[0039] In one specific implementation, such as Figure 4 and Figure 5 As shown, the two ends of the tie rod 4 are a first bend 41 and a second bend 42, respectively. The first bend 41 is located inside the cavity 14. The first bend 41 can increase the anchoring effect of the filler 6 on the tie rod 4. The second bend 42 is located within the boundary of the secondary lining 2. The second bend 42 can increase the binding points between the steel cage of the secondary lining 2 and the tie rod 4, thereby improving the connection performance between the tie rod 4 and the secondary lining 2.

[0040] The subsea tunnel segment structure described in this embodiment is connected to the cavity 14 only by the limiting fit of the filler 6. The filler 6 is anchored to the tie rod 4, which is used to connect the secondary lining 2. It does not require the setting of steel mesh 3 and pre-embedded connectors 5 to connect the tie rod 4, nor does it require secondary steel reinforcement to connect the connectors 5 and the steel cage of the secondary lining 2. The tie rod 4 can be installed without welding, which is simple to operate and greatly reduces the difficulty of preparing accessories and construction. The structure is simple, easy to use, and has good effect.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for casting the cavity of a shield tunnel segment, characterized in that, Includes the following steps: S1. Before the shield machine installs the steel pipe segment (1), first set the tie bar (4) in the cavity (14) of the steel pipe segment (1) and fill it with concrete to form a filling body (6). The filling body (6) forms a stepped fit and anchors with the inner plate (11) of the steel pipe segment (1) and the cavity opening (111). The filling body (6) anchors the tie bar (4). The tie bar (4) extends out of the cavity opening (111) to the boundary of the secondary lining (2). S2. The steel pipe segment (1) is installed in place by the tunnel boring machine; S3. The tie rod (4) is tied to the steel cage of the secondary lining (2) and the secondary lining (2) is cast to form the structure.

2. The shield tunnel segment cavity casting method according to claim 1, characterized in that, The tie rod (4) is located in the cavity (14) at one end, which is a first elbow (41). The filler (6) wraps around and anchors the first elbow (41). Alternatively, the first elbow (41) is welded to the back plate (12) of the steel pipe segment (1), and the filler (6) anchors the first elbow (41).

3. The method for casting the cavity of tunnel segment according to claim 1, characterized in that, The end of the tie rod (4) located within the boundary of the secondary lining (2) is the second bend (42).

4. The method for casting the cavity of tunnel segment according to claim 1, characterized in that, The concrete grade of the filler (6) is the same as that of the secondary lining (2).

5. The method for casting the cavity of tunnel segment according to any one of claims 1-4, characterized in that, A plurality of ribs (13) are welded between the inner plate (11) of the tube segment and the back plate (12) of the steel tube segment (1), and the ribs (13) are configured in a grid form to form the cavity (14).

6. A subsea tunnel segment structure, comprising shield steel segments (1), characterized in that, The steel segment (1) has a segment back plate (12) on its outer side and a segment inner plate (11) on its inner side. A plurality of ribs (13) are welded between the segment inner plate (11) and the segment back plate (12). The ribs (13) are arranged in a grid pattern. A cavity (14) is formed between the segment inner plate (11), the ribs (13), and the segment back plate (12). The segment inner plate (11) has a cavity opening (111). The cavity opening (111) connects to the cavity (14). The cavity (14) is provided with a tie rod (4). The tie rod (4) extends from the cavity opening (111) to the boundary of the secondary lining (2). The cavity (14) is filled with concrete to form a filler (6). The filler (6) forms a stepped fit and anchors with the inner plate of the segment (11) and the cavity opening (111). The filler (6) anchors the tie rod (4).

7. The subsea tunnel segment structure according to claim 6, characterized in that, It also includes a secondary lining (2), the steel cage of the secondary lining (2) is tied to the tie bar (4), and the secondary lining (2) wraps the tie bar (4) outside the steel pipe segment (1).

8. The subsea tunnel segment structure according to claim 7, characterized in that, The concrete grade of the filler (6) is the same as that of the secondary lining (2).

9. The subsea tunnel segment structure according to any one of claims 6-8, characterized in that, The two ends of the tie rod (4) are a first bend (41) and a second bend (42), respectively. The first bend (41) is located inside the cavity (14), and the second bend (42) is located within the boundary of the secondary lining (2).

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