Experimental device for simulating on-way resistance of tunnel

Abstract

The utility model relates to an experimental device for simulating on-way resistance of a tunnel, which comprises a tunnel main body, a tunnel bifurcation connecting section, a detachable wall surface, a jet fan, a monitor and a hydraulic control system, the tunnel main body comprises a frame tunnel pipe joint and a flexible tunnel pipe joint, and the tunnel bifurcation connecting section and the tunnel main body have the same structure; the roughness of the inner wall of the tunnel can be adjusted through the detachable wall surface; the jet fan is arranged at an inlet of the tunnel main body; the monitor is used for monitoring the wind speed and the wind pressure in the tunnel main body; the hydraulic control system is used for adjusting the tunnel curvature and the tunnel gradient. The tunnel on-way resistance testing device has the advantages that tunnel wind pressure changes under different wall surface roughness combinations can be simulated and tested, and then tunnel on-way resistance coefficients under different tunnel types and different wall surface roughness can be obtained.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel frictional resistance testing, and particularly relates to an experimental device for simulating tunnel frictional resistance. Background Art

[0002] The frictional resistance change in S-shaped and curved tunnels is complex, and the tunnel walls do not have a single wall roughness, but may be a combination of multiple wall roughnesses. To explore the influence law of different tunnel forms and different tunnel wall roughnesses on the frictional resistance, it is necessary to establish a frictional resistance testing system for highway tunnels to test the tunnel frictional resistance under different line shapes and different roughness combinations. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an experimental device for simulating tunnel frictional resistance, which can simulate and test the tunnel air pressure change under different wall roughness combinations, and then obtain the tunnel frictional resistance coefficients under different tunnel types and different wall roughnesses.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] An experimental device for simulating tunnel frictional resistance includes: a tunnel main body and a tunnel bifurcation connection section. The tunnel main body includes a frame tunnel section and a flexible tunnel section. There are multiple frame tunnel sections arranged in sequence. Adjacent two frame tunnel sections are detachably connected by a flexible tunnel section. The tunnel bifurcation connection section has the same structure as the tunnel main body, and the tunnel bifurcation connection section is detachably connected to one side wall of a frame tunnel section through a flexible tunnel section; a detachable wall surface is arranged on the inner wall of the tunnel, and the roughness of the inner wall of the tunnel can be adjusted through the detachable wall surface; a jet fan is arranged at the entrance and exit of the tunnel main body; a monitor is arranged in the tunnel main body, and the monitor is used to monitor the wind speed and air pressure inside the tunnel main body; a hydraulic control system is used to adjust the tunnel curvature and tunnel slope.

[0006] Furthermore, the frame tunnel section is a rectangular frame structure. The side walls of the frame tunnel section are detachably connected end to end by iron plates. One side of adjacent two frame tunnel sections is connected to each other by a hinge, and the other three sides of adjacent two frame tunnel sections are connected to the flexible tunnel section through flanges.

[0007] Furthermore, universal wheels are arranged at the bottom of the frame tunnel section and the bottom of the tunnel bifurcation connection section.

[0008] Furthermore, there are multiple detachable wall surfaces, which are sequentially spliced along the inner wall of the tunnel. The detachable wall surface includes a strip-shaped soft magnet and sandpaper. The sandpaper is closely attached to the strip-shaped soft magnet and adsorbed on the inner wall of the tunnel through the strip-shaped soft magnet.

[0009] Furthermore, the width of the strip magnet is 2m and its side is flat, and the grit number of the sandpaper is 240 or 260.

[0010] Furthermore, the monitor includes a wind speed monitor and a wind pressure monitor. The wind speed monitor is arranged at the tunnel entrance, the starting point of the rectification section and the tunnel exit, and the wind pressure monitor is arranged at the vault directly above the carriageway in the tunnel.

[0011] Furthermore, the hydraulic control system includes a base, a curvature hydraulic control rod and a slope hydraulic control rod. The curvature hydraulic control rod is arranged on one side of the frame tunnel segment opposite to the hinge. Both ends of the curvature hydraulic control rod are connected to two adjacent frame tunnel segments. The frame tunnel segment and the tunnel bifurcation connection section are both supported on the base through the slope hydraulic control rod.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The present invention can form two types of tunnel main bodies, straight or curved, through the frame tunnel segments and the flexible tunnel segments. The S-shaped tunnel can be formed with the tunnel main body through the tunnel bifurcation connection section. Furthermore, different types of tunnels can be constructed through the frame tunnel segments, the flexible tunnel segments and the tunnel bifurcation connection section. At the same time, the curvature and slope of the tunnel can be adjusted in combination with the hydraulic control system; on the basis of realizing the construction of different types of tunnels, by adjusting the wind speed and direction of the jet fan at the entrance of the tunnel main body, the simulation of different natural wind speeds and different natural wind directions can be realized. Combining the monitor to test the wind speed and wind pressure in the tunnel, the change of the tunnel wind pressure under different combinations of wall roughness can be simulated and tested, and then the tunnel friction factor along the line under different tunnel types and different wall roughness can be obtained. Description of the Drawings

[0014] Figure 1 is the overall structural schematic diagram of the utility model;

[0015] Figure 2 is the internal structural schematic diagram of the frame tunnel segment in the utility model.

[0016] In the figure: 1. Frame tunnel segment; 2. Flexible tunnel segment; 3. Detachable wall surface; 4. Hinge; 5. Jet fan; 6. Curvature hydraulic control rod; 7. Slope hydraulic control rod. Detailed Embodiments

[0017] The following further describes the utility model with reference to the drawings, but the protection scope of the utility model is not limited to the following.

[0018] As Figure 1 - Figure 2 shown, a simulation experimental device for tunnel frictional resistance along the way includes a tunnel main body, a tunnel bifurcation connection section, a detachable wall surface 3, a jet fan 4, a monitor, and a hydraulic control system. The tunnel bifurcation connection section has the same structure as the tunnel main body. Different types of tunnels can be constructed through the tunnel main body and the tunnel bifurcation connection section. The tunnel curvature and slope can be adjusted through the hydraulic control system. The detachable wall surface is arranged on the inner wall of the tunnel and is used to adjust the roughness of the inner wall of the tunnel. The jet fan 4 is arranged at the entrance and exit of the tunnel main body. The monitor is arranged inside the tunnel main body and is used to monitor the wind speed and wind pressure inside the tunnel main body.

[0019] As Figure 1 shown, in order to realize the construction of different types of tunnels, the tunnel main body includes a frame tunnel segment 1 and a flexible tunnel segment 2. Among them, there are multiple frame tunnel segments 1, and the multiple frame tunnel segments 1 are arranged in sequence, and two adjacent frame tunnel segments 1 are detachably connected by a flexible tunnel segment 2. Specifically, in this embodiment, the frame tunnel segment 1 is a rectangular frame structure. The side walls of the frame tunnel segment 1 are detachably connected end to end by acrylic plates through connectors such as bolts. One side of two adjacent frame tunnel segments 1 is connected to each other by a hinge 4, and the other three sides of two adjacent frame tunnel segments 1 are connected to the flexible tunnel segment 2 through flanges. Thus, a straight or curved tunnel main body can be constructed through the frame tunnel segment 1 and the flexible tunnel segment 2. After removing one side wall of a frame tunnel segment 1, the tunnel bifurcation connection section is then connected to the removed side wall through a hinge 4 and a flexible tunnel segment 2. Thus, an S-shaped tunnel can be constructed, and the bifurcation angle of the tunnel bifurcation connection section can be adjusted as needed. Universal wheels (the universal wheels are not shown in the drawings) are arranged at the bottom of the frame tunnel segment and the bottom of the tunnel bifurcation connection section. The placement positions of the frame tunnel segment and the tunnel bifurcation connection section can be conveniently adjusted through the universal wheels.

[0020] As Figure 2 shown, in order to realize the adjustment of the roughness of the inner wall of the tunnel, there are multiple detachable wall surfaces, and the multiple detachable wall surfaces are sequentially spliced along the inner wall of the tunnel. The detachable wall surface includes a strip-shaped soft magnet and sandpaper that are tightly connected. The sandpaper is tightly attached to the strip-shaped soft magnet and adsorbed on the inner wall of the tunnel through the strip-shaped soft magnet. Among them, the width of the strip-shaped magnet is 2m and the side is flat. The sandpaper grit number is 240 or 260, etc. The roughness of the inner wall of the tunnel can be adjusted by replacing sandpaper with different grit numbers;

[0021] The monitor includes a wind speed monitor and a wind pressure monitor. The wind speed monitor is arranged at the tunnel entrance, the starting point of the rectification section, and the tunnel exit. The wind pressure monitor is arranged at the vault directly above the carriageway in the tunnel.

[0022] AsFigure 1 As shown, the hydraulic control system includes a base, a curvature hydraulic control rod 6 and a slope hydraulic control rod 7. The curvature hydraulic control rod 6 is on the side of the frame tunnel segment 1 opposite to the hinge 4. The ends of the curvature hydraulic control rod 6 are respectively connected to two adjacent frame tunnel segments 1. The tunnel bifurcation connection segments of the frame tunnel segments 1 are all supported on the base by the slope hydraulic control rods. By extending and retracting the curvature hydraulic control rod 6, the flexible tunnel segment 2 can be driven to extend and retract, and then two adjacent frame tunnel segments 1 can be rotated around the hinge 4 to realize the curvature adjustment of the tunnel. By extending and retracting the slope hydraulic control rod 7, the height of the frame tunnel segment 1 can be adjusted to realize the slope adjustment of the tunnel.

[0023] When testing the tunnel frictional resistance using the above-mentioned simulated tunnel frictional resistance experimental device, the following steps are included:

[0024] S1. Construct different tunnel types through the tunnel main body and the tunnel bifurcation connection segments;

[0025] S2. Adjust the tunnel curvature and the tunnel slope through the hydraulic control system;

[0026] S3. Install a detachable wall on the inner wall of the tunnel;

[0027] S4. Adjust the wind speed and the wind direction of the jet fan 4 to realize the simulation of different natural wind speeds and different natural wind directions;

[0028] S5. Adjust the combination of the detachable walls, and monitor the wind speed and the wind pressure in the tunnel under different line conditions and different combinations of inner wall roughness through a monitor;

[0029] S6. End the test and save the monitored data;

[0030] S7. Adjust the tunnel type and repeat steps S2 - S6. By adjusting the tunnel curvature and the tunnel slope, study the influence of different variables on the tunnel frictional resistance coefficient.

[0031] Through the above-mentioned simulated tunnel frictional resistance experimental device and the corresponding test method, the present invention can simulate and test the tunnel wind pressure change under different combinations of wall roughness by constructing different tunnel types, and then can obtain the tunnel frictional resistance coefficients under different tunnel types and different wall roughnesses.

[0032] Finally, although the above description has shown and described the embodiments of the present utility model, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A device for simulating tunnel resistance along the way, characterized in that: include: A tunnel main body and a tunnel branch connection section, wherein the tunnel main body comprises a frame tunnel pipe section (1) and a flexible tunnel pipe section (2), wherein a plurality of frame tunnel pipe sections (1) are provided, wherein the plurality of frame tunnel pipe sections (1) are arranged in sequence, and two adjacent frame tunnel pipe sections (1) are detachably connected via the flexible tunnel pipe section (2), and the tunnel branch connection section has the same structure as the tunnel main body, and is detachably connected to a side wall of a frame tunnel pipe section (1) via the flexible tunnel pipe section (2); A detachable wall surface (3), the detachable wall surface (3) being arranged on the inner wall of the tunnel, and the roughness of the inner wall of the tunnel can be adjusted by the detachable wall surface (3); A jet fan (5), which is arranged at the entrance and exit of the tunnel body; A monitor is arranged in the tunnel body and is used to monitor the wind speed and wind pressure inside the tunnel body; Hydraulic control system,The hydraulic control system is used to adjust the tunnel curvature and tunnel slope.

2. The simulated tunnel resistance experimental device according to claim 1 is characterized in that: The frame tunnel pipe section (1) is a rectangular frame structure. The side walls of the frame tunnel pipe section (1) are formed by detachably connecting the ends of iron plates. One side edge of two adjacent frame tunnel pipe sections (1) is connected to each other via a hinge (4). The other three side edges of the two adjacent frame tunnel pipe sections (1) are connected to the flexible tunnel pipe section (2) via flanges.

3. The simulated tunnel resistance experimental device according to claim 1 is characterized in that: Universal wheels are provided at the bottom of the frame tunnel pipe section (1) and the bottom of the tunnel bifurcated connection section.

4. The simulated tunnel resistance experimental device according to claim 1 is characterized in that: A plurality of detachable wall surfaces (3) are provided, and the plurality of detachable wall surfaces (3) are sequentially spliced ​​along the inner wall of the tunnel. The detachable wall surfaces (3) comprise strip-shaped soft magnets and sandpaper, and the sandpaper is tightly attached to the strip-shaped soft magnets and is adsorbed on the inner wall of the tunnel through the strip-shaped soft magnets.

5. The simulated tunnel resistance experimental device according to claim 4 is characterized in that: The width of the bar magnet is 2m and the sides are flat, and the sandpaper grit is 240 or 260.

6. The simulated tunnel resistance experimental device according to claim 1 is characterized in that: The monitors include wind speed monitors and wind pressure monitors. The wind speed monitors are located at the tunnel entrance, the starting point of the rectifier section and the tunnel exit, and the wind pressure monitors are located at the arch just above the roadway in the tunnel.

7. The simulated tunnel resistance experimental device according to claim 1 is characterized in that: The hydraulic control system comprises a base, a curvature hydraulic control rod (6) and a slope hydraulic control rod (7); the curvature hydraulic control rod (6) is arranged on one side of the frame tunnel pipe section (1) opposite to the hinge (4); the two ends of the curvature hydraulic control rod (6) are respectively connected to two adjacent frame tunnel pipe sections (1); the frame tunnel pipe section (1) and the road branch connection section are supported on the base by the slope hydraulic control rod (7).

Images