Temporary inverted arch dismantling and replacement structure in tunnel hole constructed by CRD method

Abstract

The utility model discloses a kind of CRD method construction tunnel hole inside temporary inverted arch dismantling replacement structure, including temporary support frame, still including first casing, support plate, moving mechanism and positioning mechanism, two inner walls of temporary support frame are uniformly installed with first casing, support plate is slidably arranged in first casing, the bottom side wall of support plate is fixedly provided with multiple vertebral bodies, vertebral body penetrates the bottom side wall of first casing and extends first casing, moving mechanism is arranged between first casing and support plate, for driving support plate and vertebral body to move, positioning mechanism is arranged on vertebral body, for positioning between vertebral body and surrounding rock, this CRD method construction tunnel hole inside temporary inverted arch dismantling replacement structure is used to solve the problem that temporary support frame is prone to positional deviation and affects support effect in the process of temporary inverted arch dismantling replacement of prior art.

Description

Technical Field

[0001] This utility model relates to the field of temporary invert arch removal and replacement technology, specifically to a temporary invert arch removal and replacement structure for tunnels constructed using the CRD method. Background Technology

[0002] In tunnel engineering, the CRD (Cross Diaphragm) method is a segmented excavation construction method suitable for weak surrounding rock, large spans, or high-risk geological conditions. By dividing the tunnel cross-section into multiple pilot tunnels for step-by-step excavation and timely support, it effectively controls surrounding rock deformation and ensures construction safety. During CRD construction, to achieve rapid closure of each excavation face and the integrity of the initial support system, a temporary invert arch is typically installed at the bottom of each pilot tunnel.

[0003] As a temporary closed structure for initial support, the temporary invert arch, together with the initial support of the arch and sidewalls, forms a closed force ring. It can significantly constrain the longitudinal and lateral deformation of the surrounding rock, resist the vertical pressure and horizontal thrust of the bottom surrounding rock, and provide a temporary working platform for the passage of construction equipment and the transportation of materials. It is a key measure to ensure the structural stability of each section during the excavation stage.

[0004] However, as the CRD method of construction progresses, when the excavation and support of each pilot tunnel section are completed and the overall structure is connected, the temporary invert needs to be gradually removed to allow for the construction of the permanent invert, filling layer, and waterproof layer at the bottom of the tunnel. During the removal of the temporary invert, the original closed constraint at the bottom of the tunnel is broken, forming a local opening area. At this time, the surrounding rock and initial support lose the support and constraint of the temporary invert, which can easily lead to increased deformation (such as crown settlement, sidewall indentation, and bottom heave), and even structural instability.

[0005] To address the aforementioned issues, existing technologies typically involve installing temporary support frames after the temporary invert arch is removed to replace its restraining function. However, these temporary support frames are generally placed directly at the bottom of the tunnel to support the surrounding rock. When the temporary support frames are subjected to external impacts, they are prone to displacement, which in turn affects their support effectiveness. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this utility model provides a temporary invert arch removal and replacement structure for tunnels constructed using the CRD method. This structure solves the problem mentioned in the background art where temporary support frames are prone to positional displacement during the removal and replacement of temporary invert arches, thus affecting the support effect.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a temporary invert arch removal and replacement structure for tunnels constructed using the CRD method, comprising a temporary support frame, a first shell, a support plate, a moving mechanism, and a positioning mechanism. The first shell is installed on two opposing inner walls of the temporary support frame. The support plate is slidably disposed within the first shell. A plurality of cones are fixedly disposed on the bottom sidewall of the support plate. The cones extend out of the first shell through the bottom sidewall. The moving mechanism is disposed between the first shell and the support plate to drive the support plate and the cones to move. The positioning mechanism is disposed on the cones to position the cones relative to the surrounding rock.

[0010] Preferably, the moving mechanism includes a threaded rod, a first cavity, a second bevel gear, and a first driving mechanism. The threaded rod is rotatably disposed within the first housing and passes through the support plate via a threaded connection. The first cavity is formed within the first housing, and a first bevel gear is rotatably disposed on the inner bottom wall of the first cavity. The first bevel gear is fixedly connected to the threaded rod. The second bevel gear is rotatably disposed on the side wall of the first cavity and meshes with the first bevel gear. The first driving mechanism is disposed on the first housing and is used to drive the second bevel gear to rotate.

[0011] Furthermore, the first drive mechanism includes a first handwheel and a first drive rod. The first handwheel is rotatably mounted on the side wall of the first housing, and the first drive rod is fixedly mounted between the second bevel gear and the first handwheel.

[0012] Furthermore, the positioning mechanism includes a second cavity, a positioning column, and a rotating mechanism. The second cavity is provided on one side of the vertebral body located on the axis. A positioning port is provided on the side wall of the second cavity. The positioning column is rotatably disposed in the second cavity. A positioning block is fixedly disposed on the side wall of the positioning column. The positioning block extends into the positioning port. The rotating mechanism is disposed on the support plate and is used to drive the positioning column to rotate.

[0013] Furthermore, the rotating mechanism includes a third cavity, a fourth bevel gear, and a second driving mechanism. The third cavity is rotatably disposed within the support plate on one side of the positioning column. The third bevel gear is rotatably disposed on the inner bottom wall of the third cavity and is fixedly connected to the positioning column. The fourth bevel gear is rotatably disposed on the side wall of the third cavity and meshes with the third bevel gear. The second driving mechanism is disposed on the support plate and is used to drive the fourth bevel gear to rotate.

[0014] Based on the above scheme, the second driving mechanism includes a driving port and a second driving rod. The driving port is opened on the side wall of the first housing. The second driving rod is rotatably disposed between the plurality of fourth bevel gears. One end of the second driving rod extends through the driving port out of the first housing and is fixedly provided with a second handwheel.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a temporary invert arch removal and replacement structure for tunnels constructed using the CRD method, which has the following beneficial effects:

[0017] 1. In this utility model, by setting up a moving mechanism, after the temporary support frame is placed in the tunnel to support the surrounding rock, the rotation of the first handwheel can drive the first drive rod and the second bevel gear to rotate. At the same time, the meshing of the second bevel gear and the first bevel gear can drive the first bevel gear and the threaded rod to rotate. Thus, the threaded engagement between the threaded rod and the support plate can drive the cone to extend into the surrounding rock to fix its position.

[0018] 2. In this utility model, by setting up a positioning mechanism, the rotation of the second handwheel can drive the second drive rod and the fourth bevel gear to rotate. At the same time, the meshing of the fourth bevel gear and the third bevel gear can drive the third bevel gear and the positioning column to rotate. The rotation of the positioning column drives the positioning block to extend from the positioning port and insert into the surrounding rock, thereby facilitating the positioning between the cone and the surrounding rock, and thus facilitating the improvement of the fixed stability of the temporary support frame. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this application;

[0020] Figure 2 This is a structural schematic diagram from another perspective of this application;

[0021] Figure 3 This is a cross-sectional view of the moving mechanism in this application;

[0022] Figure 4 This is a cross-sectional view of the positioning mechanism in this application;

[0023] Figure 5 For this application Figure 4 A magnified schematic diagram of the partial structure at point A in the middle;

[0024] Figure 6 This is a schematic diagram of the vertebral structure of this application.

[0025] In the diagram: 1. Temporary support frame; 2. First housing; 3. Support plate; 4. Cone; 5. Threaded rod; 6. First cavity; 7. First bevel gear; 8. Second bevel gear; 9. First handwheel; 10. First drive rod; 11. Positioning port; 12. Positioning post; 13. Positioning block; 14. Third cavity; 15. Third bevel gear; 16. Fourth bevel gear; 17. Drive port; 18. Second drive rod; 19. Second handwheel. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-6 A temporary invert arch removal and replacement structure for tunnels constructed using the CRD method includes a temporary support frame 1, a first shell 2, a support plate 3, a moving mechanism, and a positioning mechanism. The first shell 2 is installed on two opposing inner walls of the temporary support frame 1. The support plate 3 is slidably disposed within the first shell 2. Multiple cones 4 are fixedly disposed on the bottom sidewall of the support plate 3. The cones 4 extend out of the first shell 2 through the bottom sidewall. The moving mechanism is disposed between the first shell 2 and the support plate 3 to drive the support plate 3 and the cones 4 to move. The positioning mechanism is disposed on the cones 4 to position the cones 4 relative to the surrounding rock.

[0028] Reference Figures 1-3The moving mechanism includes a threaded rod 5, a first cavity 6, a second bevel gear 8, and a first drive mechanism. The threaded rod 5 is rotatably disposed within the first housing 2 and passes through the support plate 3 via a threaded engagement. The first cavity 6 is located within the first housing 2, and a first bevel gear 7 is rotatably disposed on the inner bottom wall of the first cavity 6. The first bevel gear 7 is fixedly connected to the threaded rod 5. The second bevel gear 8 is rotatably disposed on the side wall of the first cavity 6 and meshes with the first bevel gear 7. The first drive mechanism is disposed on the first housing 2 and is used to drive the second bevel gear 8 to rotate. The first drive mechanism includes a first handwheel. 9 and the first drive rod 10, the first handwheel 9 is rotatably mounted on the side wall of the first housing 2, the first drive rod 10 is fixedly mounted between the second bevel gear 8 and the first handwheel 9. Specifically, after the temporary support frame 1 is placed in the tunnel to support the surrounding rock, the rotation of the first handwheel 9 can drive the first drive rod 10 and the second bevel gear 8 to rotate. At the same time, the meshing of the second bevel gear 8 and the first bevel gear 7 can drive the first bevel gear 7 and the threaded rod 5 to rotate. Thus, the threaded engagement between the threaded rod 5 and the support plate 3 can drive the cone 4 to extend into the surrounding rock for position fixation.

[0029] Reference Figures 4-6 The positioning mechanism includes a second cavity, a positioning post 12, and a rotating mechanism. The second cavity is located on one side of the vertices 4 along the axis. A positioning opening 11 is provided on the side wall of the second cavity. The positioning post 12 is rotatably disposed within the second cavity. A positioning block 13 is fixedly disposed on the side wall of the positioning post 12, extending into the positioning opening 11. The rotating mechanism is mounted on the support plate 3 and is used to drive the positioning post 12 to rotate. The rotating mechanism includes a third cavity 14, a fourth bevel gear 16, and a second driving mechanism. The third cavity 14 is rotatably disposed on one side of the positioning post 12 within the support plate 3. A third bevel gear 15 is rotatably disposed on the inner bottom wall of the third cavity 14 and is fixedly connected to the positioning post 12. The fourth bevel gear 16 is rotatably disposed on the side wall of the third cavity 14 and meshes with the third bevel gear 15. The second driving mechanism is... The second drive mechanism, which is placed on the support plate 3, is used to drive the fourth bevel gear 16 to rotate. The second drive mechanism includes a drive port 17 and a second drive rod 18. The drive port 17 is opened on the side wall of the first housing 2. The second drive rod 18 is rotatably arranged between the multiple fourth bevel gears 16. One end of the second drive rod 18 extends out of the first housing 2 through the drive port 17 and is fixedly provided with a second handwheel 19. Specifically, the rotation of the second handwheel 19 can drive the second drive rod 18 and the fourth bevel gear 16 to rotate. At the same time, the meshing of the fourth bevel gear 16 with the third bevel gear 15 can drive the third bevel gear 15 and the positioning column 12 to rotate. The rotation of the positioning column 12 drives the positioning block 13 to extend from the positioning port 11 and insert into the surrounding rock, thereby facilitating the positioning of the cone 4 and the surrounding rock, and thus improving the fixed stability of the temporary support frame 1.

[0030] Working principle: During use, when the temporary invert arch is being dismantled and replaced, the operator places the temporary support frame 1 inside the tunnel to support the surrounding rock. Then, the operator turns the first handwheel 9, which drives the first drive rod 10 and the second bevel gear 8 to rotate. Simultaneously, the meshing of the second bevel gear 8 with the first bevel gear 7 drives the first bevel gear 7 and the threaded rod 5 to rotate. Thus, the threaded engagement between the threaded rod 5 and the support plate 3 causes the cone 4 to extend into the surrounding rock for positioning. Afterward, the operator turns the second handwheel 19, which drives the second drive rod 18 and the fourth bevel gear 16 to rotate. Simultaneously, the meshing of the fourth bevel gear 16 with the third bevel gear 15 drives the third bevel gear 15 and the positioning column 12 to rotate. The rotation of the positioning column 12 causes the positioning block 13 to extend from the positioning port 11 and insert into the surrounding rock, thereby facilitating the positioning of the cone 4 between the cone 4 and the surrounding rock, and improving the stability of the temporary support frame 1.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A temporary invert arch removal and replacement structure for tunnels constructed using the CRD method, comprising a temporary support frame (1), characterized in that, Also includes: The first housing (2) is installed on both of the two inner walls opposite to the temporary support frame (1); A support plate (3) is slidably disposed inside the first housing (2). A plurality of cones (4) are fixedly disposed on the bottom sidewall of the support plate (3). The cones (4) extend out of the first housing (2) through the bottom sidewall of the first housing (2). A moving mechanism is disposed between the first housing (2) and the support plate (3) for driving the support plate (3) and the cone (4) to move; A positioning mechanism is provided on the vertebral body (4) for positioning the vertebral body (4) relative to the surrounding rock.

2. The temporary invert arch removal and replacement structure for tunnels constructed using the CRD method according to claim 1, characterized in that, The moving mechanism includes: A threaded rod (5) is rotatably disposed inside the first housing (2), and the threaded rod (5) passes through the support plate (3) through a threaded engagement; The first cavity (6) is opened inside the first housing (2). The inner bottom wall of the first cavity (6) is rotatably provided with a first bevel gear (7), and the first bevel gear (7) is fixedly connected to the threaded rod (5). The second bevel gear (8) is rotatably disposed on the side wall of the first cavity (6), and the second bevel gear (8) meshes with the first bevel gear (7); The first driving mechanism is disposed on the first housing (2) and is used to drive the second bevel gear (8) to rotate.

3. The temporary invert arch removal and replacement structure for tunnels constructed using the CRD method according to claim 2, characterized in that, The first driving mechanism includes: The first handwheel (9) is rotatably mounted on the side wall of the first housing (2); The first drive rod (10) is fixedly disposed between the second bevel gear (8) and the first handwheel (9).

4. The temporary invert arch removal and replacement structure for tunnels constructed using the CRD method according to claim 3, characterized in that, The positioning mechanism includes: The second cavity is provided on one side of the vertebral body (4) located on the axis, and the side wall of the second cavity is provided with a positioning port (11). A positioning post (12) is rotatably disposed in the second cavity. A positioning block (13) is fixedly disposed on the side wall of the positioning post (12). The positioning block (13) extends into the positioning port (11). A rotating mechanism is provided on the support plate (3) and is used to drive the positioning column (12) to rotate.

5. The temporary invert arch removal and replacement structure for tunnels constructed using the CRD method according to claim 4, characterized in that, The rotating mechanism includes: The third cavity (14) is rotatably provided in the support plate (3) on one side of the positioning column (12). The inner bottom wall of the third cavity (14) is rotatably provided with a third bevel gear (15), which is fixedly connected to the positioning column (12). The fourth bevel gear (16) is rotatably disposed on the side wall of the third cavity (14), and the fourth bevel gear (16) meshes with the third bevel gear (15); The second drive mechanism is disposed on the support plate (3) and is used to drive the fourth bevel gear (16) to rotate.

6. The temporary invert arch removal and replacement structure for tunnels constructed using the CRD method according to claim 5, characterized in that, The second drive mechanism includes: A drive port (17) is provided on the side wall of the first housing (2); The second drive rod (18) is rotatably disposed between the plurality of fourth bevel gears (16). One end of the second drive rod (18) extends through the drive port (17) and out of the first housing (2), and is fixedly provided with a second handwheel (19).

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