A back support device for a partition wall in a tunneling construction

Abstract

The utility model discloses a kind of back support devices in cut-and-cover construction, it is related to subway tunnel cut-and-cover construction technical field, in view of the problem that existing device is not closely connected with supporting surface and is inconvenient to disassemble and assemble, the utility model includes support bottom column and reinforcing mesh, the support bottom column is equipped with composite telescopic column, for realizing longitudinal telescoping and transverse telescoping;The top of the composite telescopic column is equipped with arc roof, for the center of reinforcing mesh and the top wall of tunnel closely adhere, provide supporting force for top wall;Composite telescopic column's both sides are symmetric and detachably equipped with sliding side column, for the both ends of reinforcing mesh and the both side walls of tunnel closely adhere, provide supporting force for both side walls;The utility model forms multiple-point support by composite telescopic column and sliding side column, evenly disperses side wall pressure by reinforcing mesh, can adapt to different tunnel height, reliability is high, practicality is strong, disassembly and assembly are fast, by multiple device combination use, different support needs can be flexibly adapted.

Description

Technical Field

[0001] This utility model relates to the field of subway tunnel excavation technology, and in particular to a partition wall support device for tunnel excavation. Background Technology

[0002] In subway construction, the cut-and-cover method is mainly suitable for densely populated urban areas and regions with complex geological conditions, where settlement control requirements are extremely high. The central diaphragm wall is a crucial temporary support structure separating the excavated areas in a cut-and-cover tunnel. After the initial support is completed and before secondary lining construction, the central diaphragm wall needs to be removed in sections. After removal, it is back-supported using materials such as I-beams to prevent tunnel deformation, surface settlement, and collapses during construction. Currently, using I-beams for back-support is a common practice, but it has many drawbacks, such as loose connection between the I-beams and the support surface, insufficient stability, and inconvenient installation and disassembly. Therefore, developing a back-support device that can connect tightly to the support surface and is easy to install and disassemble is particularly important.

[0003] Patent application CN116717296A discloses a temporary tunnel support structure, comprising: a vehicle body; multiple wheels rotatably connected to the bottom of the vehicle body; two fixing components located on both sides inside the vehicle body; a large support ring fixedly connected to the top of the vehicle body; small support rings fixedly connected to the large support ring and concentrically arranged; multiple telescopic rods arranged radially along the large support ring, wherein one end of the telescopic rod is detachably connected to the small support ring, and the middle of the telescopic rod passes through the large support ring; and a support portion fixedly connected to the other end of the telescopic rod for supporting the inner wall of the tunnel. In use, the vehicle body is moved into the tunnel to be supported, the telescopic rods are passed through the large support ring, and the bottom of the telescopic rods is connected to the small support rings, with the small support rings bearing the tunnel pressure transmitted by the telescopic rods. This support structure has the advantages of convenient installation and disassembly, and quick movement.

[0004] However, the following problems still exist in the use of this support structure: (1) The support structure only obtains support by being fixed to the top of the vehicle body through a large support ring. The single-point support is difficult to balance the vertical load at the top and the horizontal thrust on both sides, and the support effect may be poor due to insufficient support strength. (2) The support structure supports the tunnel side walls by means of a support plate that can be extended laterally. However, the height of the support plate is fixed when it is extended laterally. For tunnels of different heights, the support points of the side walls may deviate from the optimal stress range, which limits the effectiveness of the side wall support and reduces its practicality. Utility Model Content

[0005] To address the aforementioned problems, this utility model aims to provide a wall support device for tunnel construction. The device forms multi-point support through composite telescopic columns and sliding side columns, and evenly distributes sidewall pressure through a steel mesh. The longitudinal telescopic columns allow for adjustment of the height of the transverse telescopic rods to adapt to different tunnel heights. The steel mesh, through an arc-shaped top plate and sliding side columns, tightly adheres to the tunnel wall, providing both support and intercepting falling objects. Arc-shaped clamps connect the composite telescopic columns and I-beam columns, enabling rapid assembly and disassembly. By arranging two devices at a certain distance, they collectively support a single steel mesh to meet the required support area. For long-distance scenarios, the number of devices can be increased equidistantly, flexibly adapting to different support needs.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A partition wall support device for tunnel construction includes: a support base column and a steel mesh, and further includes: A composite telescopic column is installed inside the supporting base column to achieve longitudinal and lateral telescopic expansion and contraction. An arc-shaped top plate is movably installed on top of the composite telescopic column to tightly fit the center of the steel mesh with the top wall of the tunnel, providing support for the top wall; Sliding side columns, symmetrically and detachably installed on both sides of the composite telescopic column, are used to tightly fit the two ends of the steel mesh with the two side walls of the tunnel, providing support for the two side walls.

[0007] Through the above scheme, the composite telescopic column moves the arc-shaped top plate towards the tunnel top wall through longitudinal telescopic movement until the steel mesh is tightly attached to the tunnel top wall, providing support for the top wall. Through lateral telescopic movement, it moves the sliding side column towards the two side walls of the tunnel until the steel mesh is stretched to be tightly attached to the two side walls of the tunnel, providing support for the two side walls. By arranging at least two back support devices at a certain distance in parallel, they jointly support a piece of steel mesh, ensuring that the support area of ​​the steel mesh meets the support requirements.

[0008] Furthermore, the composite telescopic column includes: A longitudinal telescopic column is installed inside the supporting base column to achieve the first stage of longitudinal telescopic movement; A longitudinal telescopic top rod is installed on the top of the longitudinal telescopic column and connected to the arc-shaped top plate to achieve the second stage of longitudinal telescopic movement; A lateral telescopic rod is installed on both sides of the telescopic end of the longitudinal telescopic column and connected to the sliding side column to achieve lateral telescopic extension and retraction to both sides.

[0009] Furthermore, the sliding side column includes: I-beam columns are used to provide upward support for the sidewalls of the tunnel; Rollers are installed at the bottom of the I-beam column; An arc-shaped clamp detachably connects the I-beam column to the transverse telescopic rod.

[0010] With the above scheme, when the horizontal telescopic rod extends or retracts laterally, it drives the arc-shaped clamp to move, which in turn drives the I-beam column to move in the horizontal direction.

[0011] Furthermore, the arc-shaped clamp includes: Arc-shaped side panels are used to match the sidewall support points of the tunnel; A fixing plate is installed at both ends of the arc-shaped side plate, connecting the I-beam column and the transverse telescopic rod respectively.

[0012] Furthermore, the support device also includes: A ball joint is provided at the top of the longitudinal telescopic push rod; A connecting rod connects the ball joint and the arc-shaped top plate.

[0013] The beneficial effects of this utility model are: (1) This utility model forms multi-point support by setting a composite telescopic column directly below the top of the tunnel and a sliding side column for supporting the two sides of the tunnel. The side wall pressure is evenly distributed by the steel mesh, which has high reliability. (2) The transverse telescopic rod of this utility model is set on both sides of the longitudinal telescopic column. The longitudinal telescopic column can adjust the height of the transverse telescopic rod and adjust the appropriate side wall support point for tunnels of different heights. It is highly practical. (3) This utility model uses an arc-shaped top plate and sliding side columns on both sides to expand the steel mesh and make it fit tightly against the inner wall of the tunnel. The steel mesh is made of a bendable material. Under the height adjustment of the longitudinal telescopic top rod, the arc-shaped top plate moves towards the top wall of the tunnel and makes the center of the steel mesh fit against the top wall of the tunnel. Then, under the lateral telescopic action of the transverse telescopic rod, the sliding side columns move towards the two side walls of the tunnel and expand the steel mesh to both ends, so that the steel mesh bends and fits against the two side walls of the tunnel. When using the back support device, you only need to select steel mesh of different areas according to the size of the tunnel to support tunnels of different heights and widths. It has stronger adaptability and wider application range. Moreover, while providing multi-point support for the inner wall of the tunnel, the steel mesh can intercept falling objects when the surrounding rock of the tunnel becomes unstable, weaken the impact force, and protect the life safety of construction personnel. (4) This utility model connects the composite telescopic column and the I-beam column into a whole by means of arc-shaped clamps, which makes installation and disassembly simple and effectively improves construction efficiency. Moreover, the I-beam column adopts commercially available standard profiles, which significantly reduces construction costs. (5) This utility model arranges at least two back support devices at a certain distance in parallel to support a steel mesh, so as to ensure that the support area of ​​the steel mesh meets the support requirements. For scenarios that require long-distance support, the back support devices can be arranged in increasing order at a certain interval, and steel mesh of corresponding length can be installed at the same time to flexibly adapt to different support requirements. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a partition wall support device for underground excavation proposed in this utility model.

[0015] Figure 2 This is a front view of a partition wall support device for underground excavation proposed in this utility model.

[0016] Figure 3 This is a half-sectional view of a partition wall support device for underground excavation proposed in this utility model.

[0017] Figure 4 This is a schematic diagram of the composite telescopic column proposed in this utility model.

[0018] Figure 5 This is a schematic diagram of the arc-shaped clamp proposed in this utility model.

[0019] Figure 6 This is a structural schematic diagram of the I-beam column proposed in this utility model.

[0020] The above figures include the following reference numerals: 1. Supporting base column; 2. Composite telescopic column; 21. Longitudinal telescopic column; 22. Longitudinal telescopic top rod; 23. Lateral telescopic rod; 3. Curved top plate; 4. Connecting rod; 5. Ball joint; 6. Sliding side column; 61. I-beam column; 62. Support base; 63. Roller; 64. Curved clamp; 65. Curved side plate; 66. Fixing plate; 67. Bolt; 68. Nut; 7. Reinforcing mesh; 8. Tunnel. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments, and not all of the embodiments.

[0022] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0023] See attached document Figure 1-6 This application discloses a partition wall support device for tunnel excavation, comprising: a support base column 1 and a steel mesh 7. The support base column 1 contains a composite telescopic column 2, capable of longitudinal and lateral telescopic expansion and contraction. The top of the composite telescopic column 2 is provided with a ball joint 5, and the top of the ball joint 5 is provided with a connecting rod 4. An arc-shaped top plate 3 is connected to the connecting rod 4, and the arc-shaped top plate 3 can rotate flexibly under the action of the ball joint 5. The center of the steel mesh 7 contacts the arc-shaped top plate 3, and its two ends respectively contact the two ends of the laterally extended composite telescopic column 2. The composite telescopic column 2, through longitudinal telescopic expansion and contraction, drives the arc-shaped top plate 3 to move towards the top wall of the tunnel 8. The steel mesh 7 is moved until its center is tightly fitted with the top wall of the tunnel 8, providing support for the top wall. The arc-shaped top plate 3 can be made of profiles such as I-beams. The composite telescopic column 2 has symmetrical and detachable sliding side columns 6 on both sides. The composite telescopic column 2 moves the sliding side columns 6 towards the two side walls of the tunnel 8 through lateral telescopic movement until the two ends of the steel mesh 7 are stretched to be tightly fitted with the two side walls of the tunnel 8, providing support for the two side walls. The steel mesh 7 is made of a material with a certain strength that can be bent and deformed under external force, such as ordinary carbon structural steel or low-strength low-alloy steel.

[0024] In this embodiment, at least two of the back support devices are arranged side by side at a certain distance to jointly support a steel mesh 7, ensuring that the support area of ​​the steel mesh 7 meets the support requirements. For scenarios requiring long-distance support, the back support devices can be arranged in increasing order at a certain interval, and the steel mesh 7 of the corresponding length can be fitted at the same time. After the steel mesh 7 is tightly attached to the inner wall of the tunnel 8, it can not only evenly distribute the pressure on the inner wall of the tunnel 8 and provide a certain support, but also intercept falling objects and weaken the impact force when the surrounding rock of the tunnel becomes unstable, thus ensuring the safety of construction personnel.

[0025] Furthermore, the composite telescopic column 2 includes a longitudinal telescopic column 21, a longitudinal telescopic top rod 22, and a transverse telescopic rod 23. The longitudinal telescopic column 21 is installed in a T-shape inside the supporting base column 1. The core component is a longitudinal electric telescopic rod structure. Transverse columnar structures are provided on both sides of the telescopic end of the electric telescopic rod, ultimately forming a T-shaped structure. The two transverse columnar structures can move up and down with the longitudinal electric telescopic rod to achieve the first stage of longitudinal telescopic movement. The longitudinal telescopic top rod 22 is installed on the top of the longitudinal telescopic column 21, enabling the second stage of longitudinal telescopic movement. The top of 22 is fitted with the ball joint 5, which allows the arc-shaped top plate 3 to flexibly adjust the contact angle with the top wall according to the curvature of the top wall during the process of pressing the steel mesh 7 against the top wall of the tunnel 8, so as to provide optimal support force; the longitudinal telescopic column 21 is equipped with the transverse telescopic rod 23 on both sides, which can realize lateral telescopic extension and contraction to both sides; the end of the transverse telescopic rod 23 away from the longitudinal telescopic column 21 is also provided with a boss structure along the axial direction, and the boss is provided with multiple slotted through holes. The transverse telescopic rod 23 is connected to the sliding side column 6 through the boss structure at its end.

[0026] Furthermore, the sliding side column 6 includes an H-beam column 61, a support base 62, rollers 63, and an arc-shaped clamp 64. The H-beam column 61 uses commercially available standard profiles, and the appropriate specifications can be selected according to the height of the tunnel 8 to provide upward support for the sidewall of the tunnel 8. The H-beam column 61 also has multiple slotted through holes. The support base 62 is located at the bottom of the H-beam column 61. The connection between the support base 62 and the H-beam column 61 can be either welded or detachable. The rollers 63 are symmetrically arranged around the bottom of the support base 62 to facilitate the movement of the H-beam column 61. One end of the arc-shaped clamp 64 is detachably connected to the H-beam column 61 by fasteners, and the other end is also detachably connected to the transverse telescopic rod 23 by fasteners. When the transverse telescopic rod 23 extends or retracts laterally, it drives the arc-shaped clamp 64 to move, thereby driving the H-beam column 61 to move horizontally.

[0027] Furthermore, the arc-shaped clamp 64 includes an arc-shaped side plate 65, a fixing plate 66, bolts 67, and nuts 68. The arc-shaped side plate 65 can be made of profiles such as I-beams to provide the optimal contact angle for the sidewall support points of the tunnel 8. The fixing plates 66 are located at both ends of the arc-shaped side plate 65. Both fixing plates 66 have multiple circular through holes. The circular through holes on one fixing plate 66 correspond one-to-one with the slotted through holes on the I-beam column 61. The fixing plate 66 is connected to the I-beam column 61 by bolts 67 and nuts 68. The circular through holes on the other fixing plate 66 correspond one-to-one with the slotted through holes on the transverse telescopic rod 23. The fixing plate 66 is connected to the transverse telescopic rod 23 by bolts 67 and nuts 68. The connection between the two fixing plates 66 and the arc-shaped side plate 65 can be either welded or detachably connected by bolts 67 and nuts 68. It should be noted that, considering the high humidity and poor ventilation of the operating environment of the back support device, the bolts 67 and the nuts 68 should be made of materials with high corrosion resistance, such as stainless steel, copper alloy, or carbon steel with special surface treatment. Rust-preventive oil or grease should be applied to the surfaces of the bolts 67 and the nuts 68 for rust prevention and protection. Polyethylene waterproof caps can also be added to the exposed heads of the bolts 67 and the nuts 68.

[0028] The working principle of the support device described in this embodiment is as follows: The height of the transverse telescopic rod 23 is adjusted by longitudinal telescopic column 21, and the height of the arc-shaped top plate 3 is adjusted by longitudinal telescopic top rod 22, so that the arc-shaped top plate 3 moves toward the top wall of tunnel 8. With the setting of ball hinge 5, the center of steel mesh 7 can be tightly attached to the top wall of tunnel 8. Lateral extension and retraction are achieved by the horizontal telescopic rod 23, which drives the sliding side columns 6 on both sides to move towards the two side walls of the tunnel 8 until the steel mesh 7 is stretched to fit tightly against the two side walls of the tunnel 8.

[0029] Specific application examples: In subway tunnel construction, when using the diaphragm wall method for temporary support, the diaphragm wall needs to be removed in sections before secondary lining construction after the initial support is completed. To prevent tunnel deformation, surface settlement, and collapse during subsequent construction after the diaphragm wall is removed, temporary back-support is usually provided using materials such as I-beams. However, traditional I-beam back-support methods have drawbacks such as loose connection with the support surface, insufficient stability, and inconvenient installation and disassembly. Therefore, a back-support device that can be tightly connected to the support surface and is easy to install and disassemble can replace the traditional back-support method, flexibly adapting to different support needs, and is especially suitable for long-distance support scenarios.

[0030] Taking a partition wall back support device in tunnel construction as an example, the usage process of this device will be explained in detail: Step 1: Select the appropriate specifications and models of I-beam columns 61 according to the height of tunnel 8. Install the support base 62 at the bottom of the I-beam column 61. Transport the device into the location in tunnel 8 that needs support. Place the support base column 1 directly below the top wall. Connect the I-beam column 61 and the arc-shaped clamp 64 with bolts 67 and nuts 68, and then move it to a position close to the transverse telescopic rod 23. Adjust the height of the longitudinal telescopic column 21 so that the mounting holes of the arc-shaped clamp 64 and the transverse telescopic rod 23 are aligned. Connect the arc-shaped clamp 64 and the transverse telescopic rod 23 with bolts 67 and nuts 68. Apply anti-rust oil or anti-rust grease to the surface of the bolts 67 and nuts 68, and install waterproof caps. Step 2: After connecting the second device in the same way, arrange it 3-5 meters apart from the first device, extend the composite telescopic column 2 to a suitable height and width, and place the steel mesh 7 on top of the two devices; Step 3: Move the arc-shaped top plate 3 towards the top wall by using the longitudinal telescopic top rod 22 until the center of the steel mesh 7 is tightly attached to the top wall; Step 4: Move the sliding side column 6 to both sides of the wall by using the horizontal telescopic rod 23 until the two ends of the steel mesh 7 are stretched to fit tightly against the two sides of the wall. Step 5: If long-distance support is required, increase the number of devices, arrange them at equal intervals, and add steel mesh 7; Step Six: When the device needs to be disassembled, lower the longitudinal telescopic top rod 22 and shorten the transverse telescopic rod 23. First, remove the steel mesh, then remove the waterproof caps of the bolts 67 and nuts 68. Next, remove all the bolts 67 and nuts 68 at the connection points on the device. Separate the composite telescopic column 2, the arc clamp 64, and the I-beam column 61. Finally, transport all parts of the device out of the tunnel 8.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A partition wall support device for tunnel construction, comprising: The supporting base column (1) and steel mesh (7) are characterized in that they further include: A composite telescopic column (2) is installed inside the supporting base column (1) to achieve longitudinal and lateral telescopic expansion and contraction. The arc-shaped top plate (3) is movably installed on the top of the composite telescopic column (2) to tightly fit the center of the steel mesh (7) with the top wall of the tunnel (8) and provide support for the top wall; Sliding side columns (6) are symmetrically and detachably installed on both sides of the composite telescopic column (2) to tightly fit the two ends of the steel mesh (7) with the two side walls of the tunnel (8) and provide support for the two side walls.

2. The partition wall support device for tunnel construction according to claim 1, characterized in that, The composite telescopic column (2) includes: Longitudinal telescopic column (21) is installed inside the supporting bottom column (1) to achieve the first stage of longitudinal telescopic movement; The longitudinal telescopic top rod (22) is installed on the top of the longitudinal telescopic column (21) and connected to the arc-shaped top plate (3) to realize the second stage of longitudinal telescopic movement; The lateral telescopic rod (23) is installed on both sides of the telescopic end of the longitudinal telescopic column (21) and connected to the sliding side column (6) to realize lateral telescopic extension to both sides.

3. The partition wall support device for tunnel construction according to claim 2, characterized in that, The sliding side column (6) includes: I-beam columns (61) are used to provide upward support for the sidewalls of the tunnel (8); Rollers (63) are provided at the bottom of the I-beam column (61); The arc-shaped clamp (64) can detachably connect the I-beam column (61) and the transverse telescopic rod (23).

4. A partition wall support device for tunnel construction according to claim 3, characterized in that, The arc-shaped clamp (64) includes: Arc-shaped side plate (65) is used to match the side wall support points of the tunnel (8); A fixing plate (66) is provided at both ends of the arc-shaped side plate (65) and connects the I-beam column (61) and the transverse telescopic rod (23) respectively.

5. A partition wall support device for tunnel construction according to claim 2, characterized in that, The support device also includes: A ball joint (5) is provided at the top of the longitudinal telescopic top rod (22); The connecting rod (4) connects the ball joint (5) and the arc-shaped top plate (3).

Images