Supporting structure in tunnel construction

Abstract

The supporting structure in tunnel construction comprises a supporting assembly and a pipe shed assembly, the side, away from the center of a tunnel hole, of the supporting assembly is connected with the pipe shed assembly, and the supporting assembly is used for supporting a soil layer on the inner side wall of the tunnel hole; wherein one end of the pipe shed assembly is connected with a tunnel hole, the other end of the pipe shed assembly extends towards the adjacent tunnel hole and extends into a rock stratum, and the pipe shed assembly is of a curved structure. According to the supporting structure in tunnel construction, by changing the structure of the pipe shed assembly, a good advance supporting effect can be achieved during tunnel hole expanding excavation communication operation, collapse repetition is reduced after excavation, tunnel hole deformation is not likely to be caused, it can be guaranteed that the structure of the excavation face at the communication position of two parallel tunnel holes is stable, and cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of underground engineering construction, and particularly relates to a support structure in tunnel construction. Background Technique

[0002] The pipe shed assembly is a commonly used advanced support technology in tunnel or underground engineering construction, mainly used for the prevention and control of soft surrounding rock or unstable strata; when tunneling, the pipe shed assembly is usually installed along the excavation contour of the tunnel, and by carrying out advanced pre-support of the pipe shed assembly in front of the tunnel face, a longitudinal arch effect is formed, so as to effectively control the deformation of the tunnel, ensure the stability of the excavation face, prevent the collapse of the tunnel face and control the ground settlement, and avoid repeated collapses.

[0003] However, in the process of constructing the pipe shed assembly in the existing tunnel, the common pipe shed assembly is a linear structure. When expanding and connecting two tunnels into a large tunnel structure, it is often necessary to form an excavation arch to match the natural stress state of the soil or rock chamber. When continuing the excavation and connection operation between the tunnels, the linear pipe shed assembly is not easy to match the excavation contour of the arch between the two tunnels. Due to the common pipe shed assembly being a linear structure, the pipe shed assembly is not easy to match the excavation contour of the arch between the two tunnels, resulting in most of the rock or soil layers lacking good advanced support during the excavation and connection operation between the tunnels, leading to the easy falling of the soil or rock mass under the pipe shed assembly, and easy repeated collapses after excavation.

[0004] Therefore, there is room for further improvement in the structure of the pipe shed assembly in the prior art. Summary of the Utility Model

[0005] In view of this, in view of the technical problem that the pipe shed assembly in the above-mentioned prior art is not easy to match the excavation contour of the arch between the two tunnel holes, resulting in most of the rock or soil layers lacking good advanced support during the excavation and connection operation between the tunnels, and easy repeated collapses after excavation, the present application provides a support structure in tunnel construction. By changing the structure of the pipe shed assembly, it can play a good role in advanced support during the excavation and connection operation between the tunnels, and reduce repeated collapses after excavation.

[0006] To achieve the above object, the utility model provides the following technical solution: A support structure in tunnel construction, including a support assembly and a pipe shed assembly. The support assembly is connected to the pipe shed assembly on the side away from the center of the tunnel hole, and the support assembly is used to support the soil layer on the inner side wall of the tunnel hole.

[0007] Wherein, one end of the pipe shed assembly is connected to the tunnel hole, and the other end extends towards the adjacent tunnel hole and extends into the rock layer or soil layer. The pipe shed assembly is a curved structure.

[0008] Compared with the prior art, one side of the support component away from the center of the tunnel hole is connected to the pipe shed component, and the support component is used to support the soil layer on the inner side wall of the tunnel hole; one end of the pipe shed component is connected to the tunnel hole, and the other end extends towards the adjacent tunnel hole and extends into the rock layer or soil layer. The pipe shed component is a curved structure. By setting the pipe shed component as a curved structure, the curved pipe shed component can well match the excavation contour line, play a better advanced support role, and can reduce the deformation of the pipe shed component, making the force more uniform, and ensuring the structure at the excavation and connection of two parallel tunnel holes is more stable.

[0009] Further, the pipe shed component is symmetrically arranged along the center line between two adjacent tunnel holes;

[0010] The pipe shed component includes at least one shed body; among them, the connection positions of the two shed bodies with the same support component do not overlap.

[0011] Further, one shed body is connected to the same support component, and the connection position of the shed body and the support component is symmetrically arranged along the center line of the tunnel hole;

[0012] The shed body has a radian.

[0013] Further, the support component is an annular structure;

[0014] The support component includes a plurality of support members, and the support members are arc-shaped structures.

[0015] In some embodiments of the present application, two adjacent tunnel holes are respectively the first tunnel hole and the second tunnel hole, and the first tunnel hole and the second tunnel hole are arranged in parallel;

[0016] Among them, one end of the pipe shed component is connected to the support member of the first tunnel hole, and the other end extends towards the second tunnel hole and extends into the rock layer or soil layer.

[0017] In some embodiments of the present application, it further includes fasteners. One end of the fasteners is connected to the support member, and the other end extends towards the direction away from the tunnel hole and extends into the rock layer or soil layer.

[0018] Further, each fastener is connected to the corresponding single support member, and adjacent two fasteners are arranged at intervals;

[0019] Among them, the fasteners are arranged on the radial extension line of the tunnel hole.

[0020] In some embodiments of the present application, it further includes a support component and a filling layer. Both ends of the support component are respectively connected to the support members on two adjacent tunnel holes, and the support component is used to reinforce the tunnel hole;

[0021] The side of the filling layer facing away from the center of the tunnel hole is connected to the side of the support member facing the center of the tunnel hole, and the filling layer is used to reinforce the support member.

[0022] A support structure in tunnel construction of the present application has at least the following technical effects:

[0023] 1. By setting the pipe shed assembly, the pipe shed assembly is a curved structure, the pipe shed assembly includes at least one shed body, and the pipe shed assembly is symmetrically arranged along the center line between two adjacent tunnel holes. When the lateral excavation and connection are carried out in two parallel tunnel holes, the pipe shed assembly can expand the scope of application of the advanced support. When the tunnel hole continues to be excavated, the rock layer or soil layer generated by the tunnel hole can fall on the pipe shed assembly and spread around. The curved pipe shed assembly can well match the excavation contour line, play a better role in advanced support, so that the pipe shed assembly is uniformly stressed, reduce the repetition of collapse, reduce the deformation of the tunnel hole, and thus improve the stability of the tunnel hole and the stability of the excavation surface.

[0024] 2. By setting the fasteners, and the fasteners are arranged at intervals corresponding to the tunnel center line, the fasteners are arranged on the side of the support member facing away from the center of the tunnel hole, and the fasteners extend into the rock layer or soil layer along the direction away from the tunnel hole. The interval arrangement can make the stabilities on both sides of the tunnel hole the same and the stress uniform. The fasteners are used to reinforce the stability of the tunnel hole and the rock layer or soil layer, and are beneficial to preventing the support member from loosening. Description of the Drawings

[0025] Figure 1 is a schematic structural view of a support structure in tunnel construction provided by an embodiment of the present application Figure 1 ;

[0026] Figure 2 is a schematic structural view of a support structure in tunnel construction provided by an embodiment of the present application Figure 2 ;

[0027] Figure 3 is a schematic structural view of a support structure in tunnel construction provided by an embodiment of the present application Figure 3 ;

[0028] Figure 4 is a schematic structural view of the completed structure of the lateral excavation of two parallel tunnel holes of a support structure in tunnel construction provided by an embodiment of the present application Figure 1 ;

[0029] Figure 5 is a schematic structural view of the completed structure of the lateral excavation of two parallel tunnel holes of a support structure in tunnel construction provided by an embodiment of the present application Figure 2 .

[0030] Reference Signs:

[0031] 2. Support component; 3. Pipe shed component; 4. Fastener; 5. Steel tension bar; 6. Support component; 8. Intermediate partition wall; 9. Filling layer;

[0032] 11. First tunnel hole; 12. Second tunnel hole;

[0033] 21. Support member;

[0034] 31. Shed body;

[0035] 61. First primary support; 62. Second primary support; 63. Connecting piece. Detailed implementation manner

[0036] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the following will combine the accompanying drawings and embodiments to describe the present disclosure in detail, clearly and completely. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0037] In the description of the present application, if the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0038] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present application.

[0039] The following will further describe the present application in detail with reference to the accompanying drawings. See, for example, Figures 1 to 5 Description.

[0040] Embodiment 1

[0041] A support structure in tunnel construction provided in this embodiment is applied in tunnel or underground engineering construction, such as Figures 1 to 3As shown in the figure, it includes a support assembly 2 and a pipe shed assembly 3. The support assembly 2 is of an annular structure. The support assembly 2 includes at least two support members 21. The support members 21 are segment linings and are of an arc-shaped structure. The side of the support assembly 2 away from the center of the tunnel hole is connected to the pipe shed assembly 3. The support members 21 are mainly used to support and protect the surrounding soil layer of the inner side wall of the tunnel hole, prevent surface subsidence and damage to the tunnel structure; in this embodiment, the pipe shed assembly 3 is of a curved structure. One end of the pipe shed assembly 3 is connected to the tunnel hole, and the other end extends towards the adjacent tunnel hole and extends into the rock layer or soil layer above the support assembly 2. The main function of the pipe shed assembly 3 is to provide a safe operating environment for workers and equipment during the underground excavation process, and at the same time ensure the smooth progress of the excavation project. The pipe shed assembly 3 not only provides support when two parallel tunnels are manually excavated and connected using the drift method, but also can disperse and transfer the loads generated by the excavation, and prevent groundwater from flowing into the excavation area, etc. During the tunnel excavation process, the main function of the pipe shed assembly 3 is to control surface settlement, prevent structures from being damaged due to the excavation and connection between two parallel tunnel holes, ensure the safety of the structures and the smooth progress of the tunnel hole excavation, prevent and limit rock deformation, and bear the early surrounding rock pressure in advance; when the two parallel tunnel holes are horizontally excavated and connected, the pipe shed assembly 3 can expand the scope of use of the advanced support. When the tunnel hole continues to be excavated, the loosened rock layer or soil layer generated by the tunnel hole can fall on the pipe shed assembly 3. The curved pipe shed assembly 3 can well match the excavation contour at the connection between the two tunnels, play a better role in advanced support, so that the rock layer or soil layer can disperse around the pipe shed assembly 3, so that the pipe shed assembly 3 is evenly stressed, reduce the recurrence of collapses, reduce the deformation of the tunnel hole, and thus improve the stability of the tunnel hole and the stability of the excavation face.

[0042] In addition, the support members 21 can also be other components with the function of resisting pressure, not limited to the above embodiments, as long as the resistance can be achieved.

[0043] Specifically, such as Figure 2As shown, the general spacing of the pipe shed assembly 3 is 150 mm to 500 mm. The pipe shed assembly 3 is symmetrically arranged along the center line between two adjacent tunnel openings. The pipe shed assembly 3 includes at least one shed body 31. The connection positions of the two shed bodies 31 with the same support assembly 2 do not overlap. One shed body 31 is connected to the same support assembly 2, and the connection positions of the shed body 31 with the support assembly 2 are symmetrically arranged along the center line of the tunnel opening, which is beneficial to balancing the load, enabling the load to be evenly distributed on the structure, reducing the deformation and stress concentration caused by uneven structural stress, and improving the stability and seismic performance of the structure. Among them, the shed body 31 is a steel pipe structure, the shed body 31 is a curved structure, the shed body 31 is divided into multiple sections and driven above the two parallel tunnel openings. The joints between adjacent sections are welded and the ends are locally strengthened. The wall thickness of the shed body 31 is 6 mm to 8 mm, the length range of the shed body 31 is 6 to 20 meters, the radius of the shed body 31 is 3 to 20 meters. One end of the shed body 31 is connected to the support member 21, and the other end of the shed body 31 extends towards the adjacent tunnel opening, thus forming a pre-supporting effect on the rock stratum or soil layer in front of the excavation face. The shed body 31 improves the stability of the overall structure by means of grouting.

[0044] In addition, the shed body 31 can also select other components with support functions, not limited to the above embodiments, as long as the support can be achieved.

[0045] Furthermore, as Figures 1 to 3 shown, the two adjacent tunnel openings are divided into the first tunnel opening 11 and the second tunnel opening 12. The first tunnel opening 11 and the second tunnel opening 12 are arranged in parallel, and the sizes of the first tunnel opening 11 and the second tunnel opening 12 are equal. Among them, one end of the pipe shed assembly 3 is connected to the support member 21 of the first tunnel opening 11, and the other end extends towards the second tunnel opening 12 and extends into the rock stratum or soil layer above the support member 21. The distance from the second tunnel opening 12 should be controlled at about 0 to 0.5 m. It can make the pipe shed assembly 3 evenly stressed relative to the tunnel opening, reduce the deformation of the tunnel opening caused by the continuous forward excavation of the tunnel opening, and thus improve the stability of the tunnel opening and the excavation face.

[0046] Furthermore, as Figures 1 to 2As shown in the figure, a fastener 4 is provided on the side of the support member 21 facing away from the center of the tunnel hole. One end of the fastener 4 is connected to the support member 21, and the other end extends away from the tunnel hole and extends into the rock layer or soil layer. There are at least two fasteners 4, and the fastener 4 is an anchor pipe. Adjacent fasteners 4 are arranged at intervals. The fasteners 4 are arranged on the radial extension line of the tunnel hole. Fasteners 4 are provided on both sides of the two parallel tunnel holes away from the center line, and the number is equal. The distance between adjacent fasteners 4 is equal. The fastener 4 is mainly used to reinforce the support member 21 to prevent the support member 21 from translating or deforming, which can improve the stability and safety of the tunnel structure. At the same time, it can also be used to support parts such as the top and side walls of the tunnel hole to prevent the tunnel structure from being affected by external pressure and ensure the safe operation inside the tunnel hole. Among them, there is also a steel tie bar 5. One end of the steel tie bar 5 is connected to the support member 21, and the other end extends towards the tunnel hole. There is at least one steel tie bar 5. The steel tie bar 5 is arranged on the longitudinal extension line of the tunnel hole center. The steel tie bar 5 is mainly used to reinforce and support the stiffness and stability of the support member 21 to prevent the support member 21 from deforming or being damaged during assembly and use.

[0047] As Figure 4As shown in the figure, it is a completed drawing of the excavation of two parallel tunnel holes. In this embodiment, the support structure further includes a support assembly 6 and a filling layer 9. The two ends of the support assembly 6 are respectively connected to the support members 21 on two adjacent tunnel holes. The support assembly 6 is used to reinforce the tunnel holes. The support assembly 6 includes a first primary support 61, a second primary support 62, and a connecting member 63. The first primary support 61 is in an arc structure. The distance between the pipe shed assembly 3 and the first primary support 61 is generally 0 - 300 mm. The first primary support 61 is arranged below the pipe shed assembly 3. The two ends of the first primary support 61 are respectively connected to the support members 21 on two adjacent tunnel holes. At least part of the first primary support 61 is connected to the pipe shed assembly 3. The first primary support 61 is a support form that is carried out immediately after excavation and before secondary masonry. The first primary support 61 can reduce the impact of construction on the surrounding environment, avoid situations such as the collapse and landslide of the soil and rock above the tunnel, and can also stabilize the rock layer or soil layer or rock mass, prevent the deformation or settlement of the tunnel structure caused by construction, and ensure the stability of the construction site. The two ends of the connecting member 63 are respectively connected to the support members 21 on two adjacent tunnel holes. The connecting members 63 are arranged in parallel. The connecting members 63 are arranged on the top of the filling layer 9 and below the first primary support 61. The connecting members 63 are mainly used to support the tunnel holes and strengthen the integrity and stability between two adjacent tunnel holes. There is a support column between the connecting member 63 and the first primary support 61. One end of the support column is connected to the first primary support, and the other end is connected to the connecting member 63. The support column is used to support the first primary support 61 and strengthen the structure and stability of the first primary support 61. The second primary support 62 is arranged at the bottom of the tunnel hole. One end of the second primary support 62 is connected to the support member 21 on the inner wall of the first tunnel hole 11, and the other end is connected to the support member 21 on the inner wall of the second tunnel hole 12.

[0048] Further, the side of the filling layer 9 facing away from the center of the tunnel hole is connected to the side of the support member 21 facing the center of the tunnel hole. The filling layer 9 is used to reinforce the support member 21. The filling layer 9 adopts a cast - in - place concrete structure. The filling layer 9 is a secondary lining. The filling layer 9 can further reinforce the original tunnel lining structure, improve the overall stability of the tunnel hole, prevent the tunnel structure from deforming or being damaged, extend the service life of the tunnel, enhance the bearing capacity of the tunnel, disperse the load, reduce the stress on the original lining, and improve the safety of the tunnel. There is a middle partition wall 8 between two adjacent tunnel holes. The two ends of the middle partition wall 8 are respectively connected to the filling layer 9. The middle partition wall 8 is vertically connected to the filling layer 9, that is, the angle between the middle partition wall 8 and the filling layer 9 is 90°. The middle partition wall 8 mainly serves as a partition wall between two parallel and adjacent tunnels, which can effectively separate the spaces of the two tunnel holes, prevent cross - interference and confusion, ensure the independence and safety of the tunnels, and the middle partition wall 8 also serves as a support structure, which can increase the overall stability of the tunnel hole structure and improve the bearing capacity, share the load of the tunnel structure, and prevent the structure from changing or being damaged.

[0049] Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that, in this embodiment, as Figure 5 shown, there may not be a middle partition wall 8 between two adjacent tunnel holes, which can increase the field of view, reduce the blind area, improve driving safety, and at the same time, a crossover can be formed between two subway lines for connection.

[0051] The above has introduced the present application in detail. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application and its core idea. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A support structure in tunnel construction, characterized in that: It comprises a support component (2) and a pipe-roof component (3), wherein the support component (2) is connected to the pipe-roof component (3) at a side away from the center of the tunnel, and the support component (2) is used to support the soil layer on the inner wall of the tunnel; One end of the pipe-roof assembly (3) is connected to the tunnel hole, and the other end extends toward the adjacent tunnel hole and extends into the rock layer or soil layer. The pipe-roof assembly (3) is a curved structure.

2. The support structure in tunnel construction according to claim 1, characterized in that: The pipe roof assembly (3) is symmetrically arranged along the center line between two adjacent tunnel holes; The pipe roof assembly (3) comprises at least one roof body (31); wherein the connection positions of the two roof bodies (31) with the same support assembly (2) do not overlap.

3. The support structure in tunnel construction according to claim 2, characterized in that: One of the shed bodies (31) is connected to the same support assembly (2), and the connection positions of the shed body (31) and the support assembly (2) are symmetrically arranged along the center line of the tunnel; The shelf body (31) has a curvature.

4. The support structure in tunnel construction according to claim 1, characterized in that: The support assembly (2) is an annular structure; The support assembly (2) comprises a plurality of support members (21), and the support members (21) are arc-shaped structures.

5. The support structure in tunnel construction according to claim 1, characterized in that: The two adjacent tunnel holes are respectively a first tunnel hole (11) and a second tunnel hole (12), and the first tunnel hole (11) and the second tunnel hole (12) are arranged in parallel; One end of the pipe-roof assembly (3) is connected to the supporting member (21) of the first tunnel hole (11), and the other end extends toward the second tunnel hole (12) and extends into the rock layer or soil layer.

6. The support structure in tunnel construction according to claim 4, characterized in that: It also comprises a fastener (4), one end of which is connected to the supporting member (21), and the other end of which extends in a direction away from the tunnel hole and extends into the rock layer or soil layer.

7. The supporting structure in tunnel construction according to claim 6, characterized in that: Each of the fasteners (4) is connected to a corresponding single supporting member (21), and two adjacent fasteners (4) are arranged at intervals; Wherein, the fastener (4) is arranged on the radial extension line of the tunnel hole.

8. The support structure in tunnel construction according to claim 4, characterized in that: It also comprises a support assembly (6) and a filling layer (9), wherein two ends of the support assembly (6) are respectively connected to the supporting members (21) on two adjacent tunnel holes, and the support assembly (6) is used to reinforce the tunnel hole; The side of the filling layer (9) facing away from the center of the tunnel hole is connected to the side of the supporting member (21) facing the center of the tunnel hole, and the filling layer (9) is used to reinforce the supporting member (21).

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