Air duct cloth protection tool for area, close to tunnel face, of drilling and blasting method tunnel

Abstract

The utility model discloses an air duct cloth protection tool for an area close to a tunnel face of a drilling and blasting method tunnel, which comprises a plurality of standard section protection barrels arranged along the longitudinal direction of the tunnel and end section protection barrels arranged close to the tunnel face, the standard section protection cylinder and the end section protection cylinder are each composed of a left semicircular protection cylinder and a right semicircular protection cylinder, the upper ends of the left semicircular protection cylinder and the right semicircular protection cylinder are in bilateral symmetry, the left semicircular protection cylinder and the right semicircular protection cylinder each comprise longitudinal frameworks arranged at intervals in a circular surrounding mode, and the peripheries of the longitudinal frameworks are longitudinally connected with semicircular annular stirrups at intervals. A steel plate dense-mesh net is laid on the outer wall of a frame formed by the longitudinal framework and the annular stirrups, and a dense-mesh net protection bottom cover is arranged at the end, facing the tunnel face, of the end joint protection barrel. The safety protection device can effectively solve the problem of safety protection of the air duct cloth near the tunnel face in drilling and blasting method tunnel construction, reduces damage of the air duct cloth, improves the working environment in a tunnel, and improves the occupational health guarantee level of operators.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation for tunnels constructed by drilling and blasting method, in particular to a wind tube cloth protection tooling for a tunnel near a face area constructed by drilling and blasting method. Background Art

[0002] During the construction of a drill-and-blast tunnel, ventilation is generally required to ensure the air quality of the tunnel after blasting and during construction and to improve working conditions. The air ducts should be arranged within a certain range from the face. The Technical Regulations for Construction of High-Speed ​​Railway Tunnel Engineering clearly state that the distance between the ventilation duct and the excavation face should be determined according to specific conditions. The distance between the compressed ventilation outlet and the excavation face should be less than the effective range of the wind flow and varies according to the tunnel section. For small-section, small-volume, and small-diameter air ducts, the distance between the outlet and the face is about 15m. For large-section, large-volume, and large-diameter air ducts, the distance between the outlet and the face is about 45~60m.

[0003] During the blasting construction process at the tunnel face, the flying rocks generated can easily cause damage to the wind duct cloth near the face. The damage to the wind duct cloth will cause air leakage in the ventilation duct, affecting the ventilation effect of the tunnel. It also increases the workload and difficulty of subsequent wind duct cloth replacement and ventilation management. Often due to untimely replacement and large amount of wind duct cloth damage, the air volume in the face area does not meet the standards, air leakage is serious, and the working environment in the tunnel is poor, which in turn affects the physical and mental health of the personnel in the tunnel, their work efficiency, and the civilized construction effect in the tunnel. Utility Model Content

[0004] In order to solve the problem of protecting the wind duct cloth near the tunnel face during drill and blast tunnel construction, reduce the damage of the wind duct cloth near the tunnel face caused by blasting construction, and improve the ventilation effect in the area near the tunnel face, the utility model provides a wind duct cloth protection tooling for the area near the tunnel face during drill and blast tunnel construction.

[0005] The technical solution adopted by the utility model is a wind tube cloth protection tooling for a drill and blast tunnel adjacent to the face area, comprising a plurality of standard section protection tubes arranged along the longitudinal direction of the tunnel and an end section protection tube arranged adjacent to the face, the standard section protection tube and the end section protection tube both consist of a left semicircular protection tube and a right semicircular protection tube whose upper ends are symmetrically connected by hinges, the left semicircular protection tube and the right semicircular protection tube both comprise a longitudinal skeleton arranged at intervals around a circle, the outer periphery of the longitudinal skeleton is longitudinally spaced and connected with semicircular annular stirrups, the outer wall of the frame formed by the longitudinal skeleton and the annular stirrups is paved with a steel plate dense mesh, and the end section protection tube is provided with a dense mesh protective bottom cover at the end facing the face.

[0006] Furthermore, the dense mesh protective bottom cover comprises a semicircular dense mesh divided into two halves along the radial direction, which are respectively fixed on the ends of the left semicircular protective tube and the right semicircular protective tube.

[0007] Furthermore, steel sleeves are alternately arranged at the upper ends of the left semicircular protective cylinder and the right semicircular protective cylinder, and steel bar pins are inserted into the steel sleeves for connection.

[0008] Furthermore, iron wire is used to simply fix adjacent standard section protection tubes and between the standard section protection tubes and the end section protection tubes in the longitudinal direction.

[0009] Furthermore, the longitudinal skeleton adopts φ25mm steel bars and the annular stirrups adopt φ12mm steel bars.

[0010] The utility model has the following beneficial effects:

[0011] 1. The protective tooling uses steel bars as the skeleton and is connected and fixed in sections to facilitate on-site operation, disassembly and assembly, etc.

[0012] 2. The protective tooling is made of existing materials on site, which is easy to process and has strong operability.

[0013] 3. The protective tooling is assembled, can be flexibly disassembled and assembled, is easy to maintain, has a high reuse rate, and has obvious economic benefits.

[0014] 4. It can effectively solve the safety protection problem of the wind duct cloth near the heading of the drilling and blasting tunnel construction, reduce the damage of the wind duct cloth, improve the working environment in the tunnel, and improve the occupational health protection level of the workers.

[0015] 5. The use of protective tooling to protect the wind tube cloth near the tunnel face during drilling and blasting construction has a significant protective effect, civilized construction and obvious social benefits, and has significant promotion value and broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a front view of the standard section protection tube of the utility model;

[0018] Figure 3 yes Figure 2 Middle AA section view;

[0019] Figure 4 It is a structural schematic diagram of the left semicircular protective cylinder of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the right semicircular protective cylinder of the utility model;

[0021] Figure 6 It is a side view of the end section protection tube of the utility model.

[0022] In the figure: 1. Standard section protection tube; 11. Left semicircular protection tube; 12. Right semicircular protection tube; 13. Longitudinal frame; 14. Circumferential stirrups; 15. Steel plate dense mesh; 16. Steel sleeve; 2. End section protection tube; 21. Dense mesh protection bottom cover; 3. Fixed hook; 4. Wind tube cloth; 5. Palm face. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of the wind tube cloth protection tooling for the drill and blast tunnel near the face area of ​​the utility model in conjunction with the accompanying drawings.

[0024] like Figure 1 to Figure 6 As shown, a wind tube cloth protection tooling for the area near the tunnel face of a drill and blast tunnel comprises a plurality of standard section protection tubes 1 arranged along the longitudinal direction of the tunnel and an end section protection tube 2 arranged near the tunnel face 5. Both the standard section protection tube 1 and the end section protection tube 2 are composed of a left semicircular protection tube 11 and a right semicircular protection tube 12 which are symmetrically connected at the upper ends by hinges. Both the left semicircular protection tube 11 and the right semicircular protection tube 12 comprise a longitudinal steel bar skeleton 13 arranged at intervals around a circle. Semicircular annular stirrups 14 are longitudinally spaced and connected to the outer periphery of the longitudinal steel bar skeleton 13. A steel plate dense mesh 15 is laid on the outer wall of the frame formed by the steel bar skeleton 13 and the annular stirrups 14. A dense mesh protection bottom cover 21 is provided at the end of the end section protection tube 2 facing the tunnel face 5.

[0025] The wind tube cloth protection tooling is processed into a standard section protection tube 1 according to a uniform length (determined according to actual needs) along the longitudinal direction of the tunnel, and the end section protection tube 2 is adjacent to the face 5. The length of the end section protection tube 2 is consistent with the length of the standard section protection tube 1. The main difference is that a circular dense mesh protection bottom cover 21 is installed at the bottom of the end section protection tube 2.

[0026] This embodiment takes the tunnel longitudinal length of 15m and the wind tube cloth diameter of 1.8m as an example to explain in detail the wind tube cloth protection tooling. Wind tube cloths of other diameters can be determined by reference. The diameter of the standard section protection tube 1 and the end section protection tube 2 is 2.0m, and they are composed of two semicircular protective steel bar cylinders. A single semicircular protective steel bar cylinder is composed of φ25mm steel bars as the longitudinal skeleton 13. The longitudinal skeleton 13 is evenly arranged along the semicircle of 2.0m diameter at an interval angle of 60°. Semicircular circumferential stirrups 14 with φ12mm steel bars are arranged every 1m along the longitudinal skeleton 13, and the circumferential stirrups 14 are fixed to the longitudinal skeleton 13 by welding. A steel plate dense mesh 15 is welded along the outside of a single semicircular protective steel bar cylinder.

[0027] Then, a φ40mm, 30cm long steel sleeve 16 is welded every 2m on the longitudinal skeleton 13 of the single semicircular protective steel bar cylinder. The left and right semicircular protective steel bar cylinders are connected by steel bar pins through the steel sleeve 16 to form a standard section protective cylinder 1. The steel sleeve 16 only connects the upper part of the two semicircular protective steel bar cylinders, and the bottom is not connected, so as to facilitate the disassembly and assembly of the wind tube cloth 4. Two semicircular steel plate meshes are welded at the bottom of one end of the end section protective cylinder 2 near the face 5 as the mesh protection bottom cover 21.

[0028] During the on-site operation, a number of standard section protective tubes 1 and an end section protective tube 2 are connected by a steel sleeve 16 and suspended on the primary support surface of the tunnel using a fixed hook 3. The adjacent standard section protective tubes 1 and the standard section protective tubes 1 and the end section protective tube 2 are fixed longitudinally with simple iron wires to form the entire wind tube cloth protection tooling. The front end of the protection tooling (on the side of the heading face 5) is no more than 15m away from the heading face 5. The wind tube cloth 4 is installed in the fixed protection tooling. When blasting operations are carried out on the heading face 5, the use of this protection tooling can reduce the impact of blasting flying rocks on the wind tube cloth 4.

[0029] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A wind tube cloth protection tooling for the area near the face of a drill and blast tunnel, characterized in that: The invention comprises a plurality of standard section protection tubes (1) arranged along the longitudinal direction of the tunnel and an end section protection tube (2) arranged adjacent to the tunnel face (5). The standard section protection tube (1) and the end section protection tube (2) are both composed of a left semicircular protection tube (11) and a right semicircular protection tube (12) whose upper ends are hingedly connected to each other symmetrically. The left semicircular protection tube (11) and the right semicircular protection tube (12) both comprise a longitudinal frame (13) arranged in a circular manner. Semicircular annular stirrups (14) are longitudinally connected to the outer periphery of the longitudinal frame (13) at intervals. A steel plate dense mesh (15) is laid on the outer wall of the frame formed by the longitudinal frame (13) and the annular stirrups (14). A dense mesh protective bottom cover (21) is provided at the end of the end section protection tube (2) facing the tunnel face (5).

2. The wind tube cloth protection tooling for the drill and blast tunnel near the face area according to claim 1 is characterized in that: The dense mesh protective bottom cover (21) comprises a semicircular dense mesh divided into two halves along the radial direction, which are respectively fixed to the ends of the left semicircular protective cylinder (11) and the right semicircular protective cylinder (12).

3. The wind tube cloth protection tooling for the drill and blast tunnel near the face area according to claim 1 or 2, characterized in that: Steel sleeves (16) are alternately arranged at the upper ends of the left semicircular protective cylinder (11) and the right semicircular protective cylinder (12), and steel bar pins are inserted into the steel sleeves (16) for connection.

4. The wind tube cloth protection tooling for the drill and blast tunnel near the face area according to claim 1 is characterized in that: Adjacent standard section protection tubes (1) and the standard section protection tubes (1) and the end section protection tubes (2) are simply fixed longitudinally by iron wires.

5. The wind tube cloth protection tooling for the drill and blast tunnel near the face area according to claim 1 is characterized in that: The longitudinal skeleton (13) is made of φ25 mm steel bars, and the annular stirrups (14) are made of φ12 mm steel bars.

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