An excavation support structure for excavation above a tunnel

Abstract

The utility model relates to tunnel support structure technical field, especially tunnel above foundation pit excavation's excavation support structure, support unit, including lifting rod, the bottom end welding of lifting rod has support rod, the bottom end screw thread connection of support rod has support screw rod, bearing unit, including the top bolt fixed support cross bar of lifting rod, the both ends sliding connection of support cross bar have adjusting lever, the one end welding of adjusting lever has support plate, the inside installation of support cross bar has adjusting motor, the top welding of support cross bar has support arc -shaped pole, the front surface of support arc -shaped pole is established and has installed groove, the inside spigot of installed groove has connecting rod, through the setting support cross bar, adjusting lever and support plate, make tunnel above foundation pit excavation's excavation support structure can disperse the subsidence and carry out double support, therefore, have improved the support effect.

Description

Technical Field

[0001] This utility model relates to the field of tunnel support structure technology, specifically an excavation support structure for excavating foundation pits above tunnels. Background Technology

[0002] The support structure for the excavation of the foundation pit above the tunnel refers to a special protection and load-bearing system set up to ensure both the stability of the foundation pit itself and the safety of the existing tunnel structure below when excavation is carried out directly above or in the vicinity of the tunnel. It must not only resist the soil and water pressure generated during excavation to prevent the foundation pit from collapsing, but more importantly, it must control the ground deformation caused by the excavation to avoid risks such as tunnel settlement, heave, and cracking.

[0003] Existing technology publication CN221480834U discloses an excavation support structure for excavating a foundation pit above a tunnel, including a first U-shaped plate with a movable groove on one side. This excavation support structure uses movable wheels to bring one side of a second U-shaped plate against the mountainside, and a fixing mechanism to secure the equipment. Workers stand below the first U-shaped plate to excavate the mountainside. When excavation reaches a certain depth, the fixing mechanism unlocks the equipment. The movable wheels and a first threaded rod work together to completely submerge the excavated hole. A buffer mechanism cushions and supports the soil and rock at the top of the first U-shaped plate, and the fixing mechanism secures the equipment. When the excavation distance exceeds the length of the first U-shaped plate, the first threaded rod slides the second U-shaped plate against the mountainside, ensuring the workers remain below the support structure, significantly reducing safety hazards.

[0004] However, while existing excavation support structures for tunnel excavation can provide support, they are typically supported mainly by supporting components. Since these components have limited capacity to withstand force, this single-support method results in poor support performance. Therefore, we propose an excavation support structure for tunnel excavation. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an excavation support structure for excavating foundation pits above tunnels, thereby solving the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: an excavation support structure for excavating a foundation pit above a tunnel, comprising,

[0009] The support unit includes a lifting rod, the bottom end of which is welded to a support rod, and the bottom end of which is threadedly connected to a support screw.

[0010] The supporting unit includes a support crossbar bolted to the top of the lifting rod. Adjusting rods are slidably connected to both ends of the support crossbar. A support plate is welded to one end of the adjusting rod. An adjusting motor is installed inside the support crossbar. A supporting arc-shaped rod is welded to the top of the support crossbar. An installation groove is opened on the front of the supporting arc-shaped rod. A connecting rod is inserted into the inner side of the installation groove.

[0011] Preferably, a bearing is installed at the bottom end of the support screw, and a support plate is fixedly connected to the outside of the bearing.

[0012] Preferably, the inner sides of both the lifting rod and the support rod are welded with mounting brackets, and the front of the mounting brackets has an installation opening.

[0013] Preferably, an insert plate is inserted into the inner side of the mounting port, a protective frame is welded to one side of the insert plate, and a protective net is installed on the inner side of the protective frame.

[0014] Preferably, the drive end of the regulating motor is fixed with an adjusting screw via a coupling, and the adjusting screw is threadedly connected to the adjusting rod.

[0015] Preferably, there are five connecting rods, and the five connecting rods are the same size and shape.

[0016] (III) Beneficial Effects

[0017] This utility model provides an excavation support structure for excavating foundation pits above tunnels, which has the following beneficial effects:

[0018] This type of excavation support structure for tunnel excavation utilizes a combination of support crossbars, adjusting rods, and support plates. When using this structure, workers position the support structure in the installation position and then activate the lifting rod. The lifting rod moves the load-bearing unit upwards, supporting the tunnel. Simultaneously, workers can rotate the support screw as needed. The support screw rotates via bearings, and the direction of rotation causes it to move out of or into the support rod, firmly supporting the ground. Then, workers activate the adjusting motor, which rotates the adjusting screw clockwise. The adjusting rod then moves out of the support crossbar, allowing the support plate to press against the tunnel wall. When a collapse occurs and settlement occurs, the support unit primarily provides support, while some of the settlement force is transferred to the support crossbars. The support crossbars, through the adjusting rods and support plates, distribute the settlement force across the rock wall. This allows the excavation support structure to disperse settlement force and provide double support, thus improving the support effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a partial structural schematic diagram of the support unit of this utility model;

[0021] Figure 3 This is a partial structural schematic diagram of the protective netting of this utility model;

[0022] Figure 4 This is a cross-sectional view of the carrier unit of this utility model.

[0023] In the diagram: 1. Support unit; 101. Lifting rod; 102. Support rod; 103. Support screw; 104. Bearing; 105. Support plate; 106. Mounting bracket; 107. Mounting port; 108. Insert plate; 109. Protective frame; 110. Protective net; 2. Bearing unit; 201. Support crossbar; 202. Adjusting rod; 203. Support plate; 204. Support arc rod; 205. Mounting groove; 206. Connecting rod; 207. Adjusting motor; 208. Adjusting screw. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 This utility model provides a technical solution: an excavation support structure for excavating a foundation pit above a tunnel, comprising,

[0026] The support unit 1 includes a lifting rod 101, a support rod 102 welded to the bottom end of the lifting rod 101, and a support screw 103 threadedly connected to the bottom end of the support rod 102.

[0027] The supporting unit 2 includes a support crossbar 201 bolted to the top of the lifting rod 101. Adjusting rods 202 are slidably connected to both ends of the support crossbar 201. A support plate 203 is welded to one end of the adjusting rod 202. An adjusting motor 207 is installed inside the support crossbar 201. A supporting arc rod 204 is welded to the top of the support crossbar 201. An installation groove 205 is opened on the front of the supporting arc rod 204. A connecting rod 206 is inserted into the inner side of the installation groove 205.

[0028] Furthermore, a bearing 104 is installed at the bottom end of the support screw 103, and a support plate 105 is fixedly connected to the outside of the bearing 104. The support screw 103 is rotated as required, and the support screw 103 rotates through the bearing 104. The support screw 103 moves out of or into the support rod 102 due to the direction of rotation, so that the support plate 105 firmly supports the ground.

[0029] Furthermore, mounting brackets 106 are welded to the inner sides of both the lifting rod 101 and the support rod 102. The front of the mounting bracket 106 has an installation port 107. The protective component can be installed by inserting the insert plate 108 into the installation port 107 of the mounting bracket 106, which makes it convenient for workers to install.

[0030] Furthermore, an insert plate 108 is inserted into the inner side of the mounting port 107, a protective frame 109 is welded to one side of the insert plate 108, and a protective net 110 is installed on the inner side of the protective frame 109, which serves as a side protection.

[0031] Furthermore, the drive end of the adjusting motor 207 is fixed with an adjusting screw 208 via a coupling. The adjusting screw 208 is threadedly connected to the adjusting rod 202. By starting the adjusting motor 207, the adjusting motor 207 drives the adjusting screw 208 to rotate clockwise. At this time, the adjusting rod 202 can be moved out of the support crossbar 201 due to the rotation direction of the adjusting screw 208, and the support plate 203 can then press against the inner wall of the tunnel.

[0032] Furthermore, there are five connecting rods 206, all of the same size and shape. These connecting rods 206 can serve as load-bearing structures to prevent rocks from falling.

[0033] Working Principle: After installation, the installation, fixation, and safety protection of this utility model are first checked. When using the excavation support structure for the excavation of the foundation pit above the tunnel, the workers position the support structure in the installation position, and then start the lifting rod 101. The lifting rod 101 drives the bearing unit 2 to move upward, thereby supporting the tunnel above. At the same time, the workers can also rotate the support screw 103 as required. The support screw 103 rotates through the bearing 104, and the support screw 103 moves out of or into the support rod 102 due to the rotation direction, so that the support plate 105 firmly supports the ground. Then, the workers start the adjusting motor 207, which drives the adjusting screw 20 8. Rotate clockwise. At this time, the adjusting rod 202 can be moved out of the supporting crossbar 201 due to the rotation direction of the adjusting screw 208, and the supporting plate 203 can then hold against the inner wall of the tunnel. Then, insert the insert plate 108 into the installation port 107 of the mounting frame 106 so that the protective net 110 can play the role of side protection. When a collapse occurs after installation and settlement force is generated, the supporting unit 1 mainly plays the supporting role. At the same time, part of the settlement force will be applied to the supporting crossbar 201. The supporting crossbar 201 disperses the settlement force on the rock wall through the adjusting rod 202 and the supporting plate 203. This completes the use process of this utility model. This utility model has a simple structure and is safe and convenient to use.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An excavation support structure for excavating a foundation pit above a tunnel, characterized in that: The system includes a support unit (1), which includes a lifting rod (101) with a support rod (102) welded to the bottom end of the lifting rod (101) and a support screw (103) threaded to the bottom end of the support rod (102); and a bearing unit (2), which includes a support crossbar (201) bolted to the top end of the lifting rod (101), with an adjusting rod (202) slidably connected to both ends of the support crossbar (201), a support plate (203) welded to one end of the adjusting rod (202), an adjusting motor (207) installed inside the support crossbar (201), a support arc rod (204) welded to the top of the support crossbar (201), an installation groove (205) on the front side of the support arc rod (204), and a connecting rod (206) inserted into the inner side of the installation groove (205).

2. The excavation support structure for excavating a foundation pit above a tunnel according to claim 1, characterized in that: The bottom end of the support screw (103) is equipped with a bearing (104), and a support plate (105) is fixedly connected to the outside of the bearing (104).

3. The excavation support structure for excavating a foundation pit above a tunnel according to claim 1, characterized in that: The inner sides of the lifting rod (101) and the support rod (102) are both welded with mounting brackets (106), and the front of the mounting brackets (106) is provided with mounting openings (107).

4. The excavation support structure for excavating a foundation pit above a tunnel according to claim 3, characterized in that: An insert plate (108) is inserted into the inner side of the mounting port (107), a protective frame (109) is welded to one side of the insert plate (108), and a protective net (110) is installed on the inner side of the protective frame (109).

5. The excavation support structure for excavating a foundation pit above a tunnel according to claim 1, characterized in that: The drive end of the regulating motor (207) is fixed with an adjusting screw (208) via a coupling, and the adjusting screw (208) is threadedly connected to the adjusting rod (202).

6. The excavation support structure for excavating a foundation pit above a tunnel according to claim 1, characterized in that: Five connecting rods (206) are provided, and the five connecting rods (206) are the same size and shape.

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