Flexible air duct anti-blasting device for underground tunneling roadway

Abstract

The utility model discloses a flexible air duct anti-blasting device used for an underground tunneling roadway, and belongs to the related fields of underground ventilation systems and safety production. The flexible air duct comprises the flexible air duct, the rigid fixing structure and the elastic fixing structure, the flexible air duct is additionally provided with the telescopic joint, the telescopic joint can stretch out and draw back when the air duct is impacted to reduce damage of shock waves to the air duct, and the rigid fixing structure ensures that the air duct at the rear end is kept stable under the influence of blasting shock waves. The elastic fixing structure is composed of a fixing block and a built-in spring, a moving space is reserved around the bottom of the built-in spring, when the front-end air duct swings under shock waves, the front-end air duct can swing up and down and left and right, and the influence of gun impact on the front-end air duct is reduced. According to the utility model, the problem that the air duct is damaged due to the influence of blasting shock waves because the air duct is too close to a tunnel face in the current underground roadway tunneling process is solved, and the ventilation requirement of a working face is ensured while the roadway tunneling progress is kept.

Description

A flexible ventilation duct anti-blast device for use in underground tunneling. Technical Field

[0001] This utility model belongs to the field of underground ventilation systems and safety production, specifically relating to a flexible ventilation duct anti-blast device used in underground tunneling. Background Technology

[0002] According to relevant regulations, ventilation must meet construction requirements during underground tunnel excavation, and the distance between the ventilation duct and the working face must not exceed the specified distance. Currently, ventilation methods in underground tunnel excavation include forced ventilation, exhaust ventilation, and mixed ventilation. Exhaust ventilation generally uses rigid ventilation ducts, while forced ventilation generally uses flexible ventilation ducts.

[0003] In actual production, roadways using pressurized flexible ventilation ducts are damaged by the shock waves generated by blasting. After the damage, the ducts need to be repaired before work can resume. During this period, the roadway excavation progress is halted, thus affecting the overall production organization underground. Summary of the Invention

[0004] This utility model provides a flexible ventilation duct anti-blast device for use in underground tunneling, aiming to solve the problem in the background art that flexible ventilation ducts are easily damaged by shock waves, thus affecting underground production organization.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A flexible ventilation duct anti-blast device for use in underground tunneling includes a flexible ventilation duct, characterized in that the flexible ventilation duct further includes a rigid fixing structure and an elastic fixing structure, and a first fixing ring and a second fixing ring are respectively provided at both ends of the flexible ventilation duct, and an expansion joint is provided between the first fixing ring and the second fixing ring, the expansion joint being provided on the wall of the flexible ventilation duct.

[0007] Furthermore, the rigid fixing structure includes a first fixing ring and a first fixing base. A connecting block is provided at one end of the first fixing base, and the connecting block is connected to the first fixing ring. The other end of the first fixing base is connected to a first anchor rod, and the first fixing base is fixed to the top of the roadway by the first anchor rod.

[0008] Furthermore, a movable space is provided within the second fixed base, and a movable block is provided within the movable space. The movable block has a through hole, and the spring is connected to the movable block through the through hole.

[0009] Furthermore, the elastic fixing structure is disposed at the front end of the flexible air duct, and the rigid fixing structure is disposed at the rear end of the flexible air duct.

[0010] The beneficial effects of this utility model are as follows: This utility model adds an expansion joint to the original flexible ventilation duct, which can reduce the damage to the flexible ventilation duct near the blasting face. The rigid fixing structure and the elastic fixing structure respectively ensure the stability of the front end of the rear end of the flexible ventilation duct when subjected to impact. This device provides favorable conditions for construction and indirectly improves production efficiency. Attached Figure Description

[0011] Figure 1 is a structural schematic diagram of this utility model.

[0012] Figure 2 is a schematic diagram of the rigid fixing structure of this utility model.

[0013] Figure 3 is a schematic diagram of the flexible fixing structure of this utility model.

[0014] In the figure, 1 is the flexible ventilation duct, 2 is the rigid fixing structure, 3 is the expansion joint, 4 is the flexible fixing structure, 5 is the first fixing ring, 6 is the first fixing base, 7 is the connecting block, 8 is the first anchor rod, 9 is the second fixing base, 10 is the spring, 11 is the second anchor rod, and 12 is the second fixing ring. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] As shown in Figures 1-3: A flexible ventilation duct anti-blast device for use in underground tunneling includes a flexible ventilation duct 1. The flexible ventilation duct 1 further includes a rigid fixing structure 2 and an elastic fixing structure 4. A first fixing ring 5 and a second fixing ring 12 are respectively provided at both ends of the flexible ventilation duct 1. An expansion joint 3 is provided between the first fixing ring 5 and the second fixing ring 12. The expansion joint 3 is provided on the wall of the flexible ventilation duct 1. The vibrations received by the flexible ventilation duct 1 can be buffered by the elastic deformation of the expansion joint 3 to prevent the flexible ventilation duct 1 from breaking.

[0017] Specifically, the rigid fixing structure 2 includes a first fixing ring 5 and a first fixing base 6. One end of the first fixing base 6 is provided with a connecting block 7, which is connected to the first fixing ring 5. The other end of the first fixing base 6 is connected to a first anchor rod 8, and the first fixing base 6 is fixed to the top of the roadway by the first anchor rod 8.

[0018] Specifically, an active space is provided inside the second fixed base 9, and an active block 13 is provided in the active space. The active block 13 has a through hole, and the spring 10 is connected to the active block 13 through the through hole.

[0019] Specifically, the elastic fixing structure 4 is located at the front end of the flexible ventilation duct 1. When subjected to shock wave oscillation, the spring 10 can swing up, down, left, and right, dissipating energy and reducing the impact of the blast wave on the front ventilation duct. The rigid fixing structure 2 is located at the rear end of the flexible ventilation duct 1, ensuring that the ventilation duct at the rear end of the fixing device remains stable under the influence of the blast shock wave.

[0020] Before carrying out underground operations, the rigid fixing device 2 and the flexible fixing device 4 are first fixed to the top and side of the roadway by the first anchor rod 8 and the second anchor rod 11, respectively. The first fixing ring 5 and the second fixing ring 12 are respectively fitted onto the rear end and the front end of the flexible ventilation duct 1. The two ends of the expansion joint 3 are closely connected to the front and rear ends of the flexible ventilation duct 1 by flanges.

[0021] During underground ventilation operations, when impacted, the front ventilation duct is pushed by the impact, causing the spring 10 to move. Because the spring 10 and the fixed block 9 have a space around their bottom, they can sway up, down, left, and right when subjected to the shock wave, dissipating energy and reducing the impact of the blast. Simultaneously, the expansion joint 3 extends and retracts axially, preventing the ventilation duct from breaking due to the shock wave. The rear ventilation duct, thanks to the rigid fixing structure 2, remains stable under the influence of the blast shock wave. After the impact, the spring 10 automatically resets, and the expansion joint 3 returns to its original length. This invention, through the triple protection of the rigid fixing structure 2, the elastic fixing structure 4, and the expansion joint 3, solves the problem of damage to the flexible ventilation duct 1 near the blasting face during underground operations, providing favorable conditions for completing the construction task and indirectly improving production efficiency.

Claims

1. A flexible ventilation duct anti-blast device for use in underground tunneling, comprising a flexible ventilation duct (1), characterized in that, The flexible duct (1) further includes a rigid fixing structure (2) and an elastic fixing structure (4). The flexible duct (1) is provided with a first fixing ring (5) and a second fixing ring (12) at both ends. An expansion joint (3) is provided between the first fixing ring (5) and the second fixing ring (12). The expansion joint (3) is provided on the wall of the flexible duct (1).

2. The flexible ventilation duct anti-blast device for use in underground tunneling as described in claim 1, characterized in that, The rigid fixing structure (2) includes a first fixing ring (5) and a first fixing base (6). A connecting block (7) is provided at one end of the first fixing base (6), and the connecting block (7) is connected to the first fixing ring (5). The other end of the first fixing base (6) is connected to the first anchor rod (8), and the first fixing base (6) is fixed to the top of the roadway by the first anchor rod (8).

3. The flexible ventilation duct anti-blast device for use in underground tunneling as described in claim 1, characterized in that, The elastic fixing structure (4) includes a second fixing ring (12) and a second fixing base (9). One end of the second fixing base (9) is connected to a spring (10), and the spring (10) is connected to the second fixing ring (12). The other end of the second fixing base (9) is connected to a second anchor rod (11). The second fixing base (9) is fixed to the top of the roadway by the second anchor rod (11).

4. A flexible ventilation duct anti-blasting device for use in underground tunneling as described in claim 3, characterized in that, The second fixed base (9) has an open space, and an open block (13) is provided in the open space. The open block (13) has a through hole, and the spring (10) is connected to the open block (13) through the through hole.

5. A flexible ventilation duct anti-blasting device for use in underground tunneling as described in claim 1, characterized in that, The elastic fixing structure (4) is disposed at the front end of the flexible air duct (1), and the rigid fixing structure (2) is disposed at the rear end of the flexible air duct (1).

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