A bidirectional belt conveyor transportation system and method for long-distance and steep longitudinal slope tunnel construction

Abstract

The present invention discloses a bidirectional belt conveyor transportation system and method for long-distance, steep longitudinal slope tunnel construction. The transportation system includes a bidirectional belt conveyor arranged in a branch tunnel for simultaneous slag discharge and sand and gravel aggregate transportation during tunnel construction, a sand and gravel aggregate loading and transportation device and a slag unloading and transportation device arranged outside the tunnel, and a sand and gravel aggregate unloading and transportation device and a slag loading and transportation device arranged in the cross-expanded cavern of the main tunnel and the branch tunnel. The present invention has a simple structure. The sand and gravel aggregate loading and transportation device, the bidirectional belt conveyor, and the sand and gravel aggregate unloading and transportation device jointly realize the function of the lower belt of the bidirectional belt conveyor to carry materials in the return process. The slag loading and transportation device, the bidirectional belt conveyor, and the slag unloading and transportation device jointly realize the function of the upper belt of the bidirectional belt conveyor to discharge slag. This achieves the purpose of bidirectional transportation of blasting slag and sand and gravel aggregate in the construction of long-distance, steep longitudinal slope tunnels, and can solve the technical problem of safe and efficient transportation of slag in the construction of long-distance, steep longitudinal slope tunnels.

Description

Technical Field

[0001] The invention belongs to the technical field of water conveyance tunnel construction, and in particular relates to a bidirectional belt conveyor transportation system and method for long-distance and steep longitudinal slope tunnel construction. Background Art

[0002] In the traditional water conveyance tunnel construction, slag and gravel aggregate transportation are mostly carried out by car or belt conveyor. When the slope of the branch tunnel is large and the slope is straight to the bottom, and the transportation space of the branch tunnel excavation section is extremely narrow, car transportation has serious shortcomings such as high risk and low efficiency. Belt conveyor transportation is adopted because it occupies a small working space, is convenient for construction organization, has low ventilation pressure and transportation cost. However, when existing tunnels use belt conveyors for slag or transport of gravel aggregate, it is mainly one-way transportation, that is, one-way slag or one-way transportation of gravel aggregate. For the construction of tunnels with long distances and large longitudinal slopes, when slag is transported, the slag is transported in a one-way manner. When materials and aggregate need to be transported in opposite directions using a conveyor belt, two conveyors are typically required. If bidirectional transport is considered, the return journey requires downhill transport, necessitating the prevention of slippage. During this return journey, the belt is fully loaded, and due to inertia and gravity, the belt speed gradually increases. When the main drive motor exceeds the set speed, the traction becomes negative due to the motor's power generation, making it prone to slippage during downtime. Existing aggregate storage silos occupy large areas, and open stacking of aggregate is susceptible to contamination. Therefore, a bidirectional conveyor belt transport system and method for long-distance, steeply sloped tunnel construction should be provided. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies in the above-mentioned existing technologies and provide a two-way belt conveyor transportation system and method for the construction of long-distance and large longitudinal slope tunnels. The system has a simple structure and a reasonable design. The sand and gravel aggregate loading and transportation device, the two-way belt conveyor and the sand and gravel aggregate unloading and transportation device jointly realize the function of the lower belt of the two-way belt conveyor to return materials, and the slag loading and transportation device, the two-way belt conveyor and the slag unloading and transportation device jointly realize the function of the upper belt of the two-way belt conveyor to discharge slag, thereby realizing the purpose of two-way transportation of blasting slag and sand and gravel aggregate in the construction of long-distance and large longitudinal slope tunnels, and being able to solve the technical problem of safe and efficient transportation of slag in the construction of long-distance and large longitudinal slope tunnels.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a two-way belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction, characterized in that it includes a two-way belt conveyor arranged in the branch tunnel for tunnel construction slag discharge and sand and gravel aggregate transportation simultaneously, a sand and gravel aggregate loading and transportation device and a slag material unloading and transportation device arranged outside the tunnel, and a sand and gravel aggregate unloading and transportation device and a slag material loading and transportation device arranged in the cross-expanded cavern of the main tunnel and the branch tunnel; the sand and gravel aggregate loading and transportation device includes an external sand and gravel aggregate storage bin arranged outside the tunnel, a sand and gravel aggregate loading hopper, a first large-angle belt conveyor and a first horizontal belt conveyor connected to the discharge end of the first large-angle belt conveyor, the discharge end of the first horizontal belt conveyor is connected to the lower belt of the two-way belt conveyor; the sand and gravel aggregate unloading and transportation device The conveying device includes a third large-angle belt conveyor connected to the sand and gravel aggregate discharge end of the bidirectional belt conveyor and a mobile reversible belt conveyor connected to the third large-angle belt conveyor, and the discharge end of the mobile reversible belt conveyor is provided with an in-tunnel sand and gravel aggregate storage bin; the slag loading and transportation device includes an in-tunnel slag temporary storage hole, a slag loading hopper, a slag crusher, a second large-angle belt conveyor and a second horizontal belt conveyor connected to the discharge end of the second large-angle belt conveyor, and the discharge end of the second horizontal belt conveyor is connected to the upper belt of the bidirectional belt conveyor; the slag unloading and transportation device includes an out-tunnel slag transfer belt conveyor connected to the slag discharge end of the bidirectional belt conveyor and a unloading pool connected to the discharge end of the out-tunnel slag transfer belt conveyor, and an electric-controlled hydraulic brake roller mechanism is provided on the lower belt of the bidirectional belt conveyor.

[0005] The above-mentioned bidirectional belt conveyor transportation system for long-distance and steep longitudinal slope tunnel construction is characterized in that the driving mechanism of the bidirectional belt conveyor is arranged outside the tunnel, and the driving mechanism includes three main driving motors, and the three main driving motors are all controlled by a PLC controller and a frequency converter.

[0006] The above-mentioned bidirectional belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction is characterized in that: the electronically controlled hydraulic brake roller mechanism includes multiple hydraulic brake rollers, and the multiple hydraulic brake rollers are all controlled by a microcontroller. A speed sensor is provided on the lower belt of the bidirectional belt conveyor, and the microcontroller and the speed sensor are both connected to the PLC controller.

[0007] The above-mentioned bidirectional belt conveyor transportation system for long-distance and steep longitudinal slope tunnel construction is characterized in that a tensioning tower is provided on the upper belt of the bidirectional belt conveyor, and a cleaning box is provided on the lower belt of the bidirectional belt conveyor.

[0008] The above-mentioned bidirectional belt conveyor transportation system for long-distance and large longitudinal slope tunnel construction is characterized in that the sand and gravel aggregate storage bin outside the tunnel and the sand and gravel aggregate storage bin inside the tunnel both include small stone bins, medium stone bins, pea stone bins and sand and gravel bins, and the sand and gravel aggregate storage bin inside the tunnel is a steel structure storage bin.

[0009] The present invention also provides a method for bidirectionally transporting sand and gravel aggregates and slag using the bidirectional belt conveyor transport system for long-distance and steep longitudinal slope tunnel construction, which is characterized in that:

[0010] During the transportation of sand and gravel aggregates, the order in which the five belt conveyors are started is: mobile reversible belt conveyor, third largest angle belt conveyor, bidirectional belt conveyor, first horizontal belt conveyor and first largest angle belt conveyor; the order in which the five belt conveyors are stopped is: first largest angle belt conveyor, first horizontal belt conveyor, bidirectional belt conveyor, third largest angle belt conveyor and mobile reversible belt conveyor; the transportation process of sand and gravel aggregates is as follows:

[0011] The sand and gravel aggregate in the sand and gravel aggregate storage bin outside the tunnel is transported to the belt of the first large-angle belt conveyor by using the sand and gravel aggregate upper hopper. The sand and gravel aggregate is sequentially transported to the lower belt of the bidirectional belt conveyor through the first large-angle belt conveyor and the first horizontal belt conveyor. The sand and gravel aggregate is transported to the third large-angle belt conveyor by the lower belt of the bidirectional belt conveyor. After that, the sand and gravel aggregate is transported to the mobile reversible belt conveyor through the third large-angle belt conveyor. The mobile reversible belt conveyor transports the sand and gravel aggregate to the small stone silo, the medium stone silo, the pea stone silo or the sand and gravel silo for storage.

[0012] During the slag transportation process, the four belt conveyors start in the following order: the outer tunnel slag transfer belt conveyor, the bidirectional belt conveyor, the second horizontal belt conveyor, and the second largest angle belt conveyor. The four belt conveyors stop in the following order: the second largest angle belt conveyor, the second horizontal belt conveyor, the bidirectional belt conveyor, and the outer tunnel slag transfer belt conveyor. The slag transportation process is as follows:

[0013] The slag in the tunnel is temporarily stored by using the slag upper hopper and the slag crusher. The slag in the tunnel is transported to the second large-angle belt conveyor. The slag is sequentially transmitted to the upper belt of the bidirectional belt conveyor through the second large-angle belt conveyor and the second horizontal belt conveyor. The upper belt of the bidirectional belt conveyor transports the sand and gravel aggregates to the slag transfer belt conveyor outside the tunnel, and the slag transfer belt conveyor outside the tunnel transports the slag to the unloading pool.

[0014] The above-mentioned method for bidirectional transportation of sand and gravel aggregates and slag is characterized in that: the control process during the operation of the bidirectional belt conveyor is: the three main drive motors are controlled by the PLC controller and the frequency converter to work simultaneously, driving the belt of the bidirectional belt conveyor to run according to the set belt running speed. During the bidirectional operation of the bidirectional belt conveyor, the speed sensor transmits the actual belt running speed detected in real time to the PLC controller, and the PLC controller compares the actual belt running speed detected in real time with the set belt running speed. When the actual belt running speed exceeds the set belt running speed, the PLC controller transmits a control signal to the microcontroller, and the microcontroller controls the operation of multiple hydraulic brake rollers. At the same time, the frequency converter controls the speed of the three main drive motors to reduce the traction force of the main drive motors until the bidirectional belt conveyor runs normally according to the set belt running speed. The value range of the set belt running speed is 1.8m / s~2.5m / s.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention sets a bidirectional belt conveyor in the branch tunnel for simultaneous slag discharge and sand and gravel aggregate transportation during tunnel construction, sets a sand and gravel aggregate loading and transportation device and a slag unloading and transportation device outside the tunnel, sets a sand and gravel aggregate unloading and transportation device and a slag loading and transportation device in the cross-expanded cavern of the main tunnel and the branch tunnel, the sand and gravel aggregate loading and transportation device, the bidirectional belt conveyor and the sand and gravel aggregate unloading and transportation device jointly realize the function of the lower belt of the bidirectional belt conveyor to carry materials in the return trip, and the slag loading and transportation device, the bidirectional belt conveyor and the slag unloading and transportation device jointly realize the function of the upper belt of the bidirectional belt conveyor to discharge slag.

[0017] 2. In order to avoid the phenomenon of overrunning, the present invention arranges an electric-controlled hydraulic brake roller mechanism on the lower belt of the bidirectional belt conveyor. During the operation of the bidirectional belt conveyor, the electric-controlled hydraulic brake roller mechanism is used to adjust the operating speed of the bidirectional belt conveyor, which can solve the technical problem of safe and efficient transportation of slag in the construction of long-distance and large longitudinal slope tunnels. Compared with the traditional method of using a brake motor to brake the reducer drive shaft, the electric-controlled hydraulic brake roller mechanism will not cause the problem of tensioning the upper belt and relaxing the lower belt, and can ensure the smooth operation of the bidirectional belt conveyor.

[0018] 3. The present invention arranges a mobile reversible belt conveyor and a sand and gravel aggregate storage bin in the tunnel at the intersection section of the main and branch tunnels. The sand and gravel aggregate storage bin in the tunnel is a steel structure aggregate bin. The mobile reversible belt conveyor is arranged above the steel structure aggregate bin. The lower belt of the two-way belt conveyor transports the sand and gravel aggregate to the third large-angle belt conveyor. After that, the sand and gravel aggregate is transmitted to the mobile reversible belt conveyor through the third large-angle belt conveyor. The mobile reversible belt conveyor can transport the sand and gravel aggregate to the small stone bin, the medium stone bin, the pea stone bin or the sand and gravel bin for storage, thereby realizing the single transportation of different types of sand and gravel aggregates.

[0019] 4. The present invention has a simple structure and reasonable design. It makes full use of the intersection of the main tunnel and the branch tunnel to expand the location space of the cavern and has a reasonable layout, thereby achieving the purpose of two-way transportation of blasting slag and sand and gravel aggregates in the construction of long-distance and large longitudinal slope tunnels, and improving construction efficiency.

[0020] To sum up, the present invention has a simple structure and a reasonable design. The sand and gravel aggregate loading and transporting device, the bidirectional belt conveyor and the sand and gravel aggregate unloading and transporting device jointly realize the function of the lower belt of the bidirectional belt conveyor to return materials, and the slag loading and transporting device, the bidirectional belt conveyor and the slag unloading and transporting device jointly realize the function of the upper belt of the bidirectional belt conveyor to discharge slag, thereby realizing the purpose of bidirectional transportation of blasting slag and sand and gravel aggregate in the construction of long-distance and large longitudinal slope tunnels, and can solve the technical problem of safe and efficient transportation of slag in the construction of long-distance and large longitudinal slope tunnels.

[0021] The present invention is further described in detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the principle of the bidirectional belt conveyor system of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the present invention.

[0024] Description of the accompanying drawings:

[0025] DETAILED DESCRIPTION

[0026] like Figure 1 and Figure 2As shown, the present invention is a bidirectional belt conveyor transportation system for long-distance and steep longitudinal slope tunnel construction, comprising a bidirectional belt conveyor 1 arranged in a branch tunnel 16 for synchronous slag discharge and sand and gravel aggregate transportation during tunnel construction, a sand and gravel aggregate loading and transportation device and a slag unloading and transportation device arranged outside the tunnel, and a sand and gravel aggregate unloading and transportation device and a slag loading and transportation device arranged in an expanded cavern 17 crossing the main tunnel and the branch tunnel; the sand and gravel aggregate loading and transportation device comprises an external sand and gravel aggregate storage bin 9 arranged outside the tunnel, a sand and gravel aggregate loading hopper 10, a first large-angle belt conveyor 2 and a first horizontal belt conveyor 3 connected to the discharge end of the first large-angle belt conveyor 2, the discharge end of the first horizontal belt conveyor 3 being connected to the lower belt of the bidirectional belt conveyor 1; the sand and gravel aggregate unloading and transportation device comprises a A third large-angle belt conveyor 6 connected to the sand and gravel aggregate discharge end and a mobile reversible belt conveyor 7 connected to the third large-angle belt conveyor 6, the discharge end of the mobile reversible belt conveyor 7 is provided with an in-tunnel sand and gravel aggregate storage bin 8; the slag loading and transportation device includes an in-tunnel slag temporary storage hole 18, a slag loading hopper, a slag crusher, a second large-angle belt conveyor 4 and a second horizontal belt conveyor 5 connected to the discharge end of the second large-angle belt conveyor 4, the discharge end of the second horizontal belt conveyor 5 is connected to the upper belt of the bidirectional belt conveyor 1; the slag unloading and transportation device includes an out-tunnel slag transfer belt conveyor 11 connected to the slag discharge end of the bidirectional belt conveyor 1 and a unloading pool 12 connected to the discharge end of the out-tunnel slag transfer belt conveyor 11, and an electrically controlled hydraulic brake roller mechanism is provided on the lower belt of the bidirectional belt conveyor 1.

[0027] In this embodiment, the main tunnel 15 and the branch tunnel 16 intersect to form an expanded cavern 17 where the main tunnel and the branch tunnel intersect. A bidirectional belt conveyor 1 for simultaneous slag discharge during tunnel construction and sand and gravel aggregate transportation is arranged in the branch tunnel 15, a sand and gravel aggregate loading and transportation device and a slag unloading and transportation device are arranged outside the tunnel, and a sand and gravel aggregate unloading and transportation device and a slag loading and transportation device are arranged in the expanded cavern 17 where the main tunnel and the branch tunnel intersect. The sand and gravel aggregate loading and transportation device, the bidirectional belt conveyor 1 and the sand and gravel aggregate unloading and transportation device jointly realize the function of the lower belt of the bidirectional belt conveyor 1 to carry materials in the return trip, and the slag loading and transportation device, the bidirectional belt conveyor 1 and the slag unloading and transportation device jointly realize the function of the upper belt of the bidirectional belt conveyor 1 to discharge slag.

[0028] In this embodiment, since the two-way belt conveyor 1 runs downhill when carrying out the slag in the return process, the belt of the two-way belt conveyor 1 is in a fully loaded running state. Affected by inertia and gravity acceleration, the belt running speed will gradually increase. When the set speed is exceeded, the main drive motor 1-1 is in a power generation state. At this time, the traction force of the main drive motor 1-1 is a negative value, and it is very easy to cause a runaway phenomenon when it stops. Therefore, in order to avoid the runaway phenomenon, an electrically controlled hydraulic brake roller mechanism is provided on the lower belt of the two-way belt conveyor 1. During the operation of the two-way belt conveyor 1, the operating speed of the two-way belt conveyor 1 is adjusted by using the electrically controlled hydraulic brake roller mechanism. This can solve the technical problem of safe and efficient transportation of slag in long-distance and steep longitudinal slope tunnel construction. Compared with the traditional method of using a brake motor to brake the reducer drive shaft, the electrically controlled hydraulic brake roller mechanism will not cause the upper belt to be tensioned and the lower belt to be relaxed, and can ensure the smooth operation of the two-way belt conveyor 1.

[0029] In this embodiment, a mobile reversible belt conveyor 7 and an in-tunnel sand and gravel aggregate storage bin 8 are arranged at the intersection section of the main and branch tunnels. The in-tunnel sand and gravel aggregate storage bin 8 is a steel structure aggregate bin. The mobile reversible belt conveyor 7 is arranged above the steel structure aggregate bin. The lower belt of the two-way belt conveyor 1 transports the sand and gravel aggregate to the third large-angle belt conveyor 6. After that, the sand and gravel aggregate is transmitted to the mobile reversible belt conveyor 7 through the third large-angle belt conveyor 6. The mobile reversible belt conveyor 7 can transport the sand and gravel aggregate to the small stone bin, the medium stone bin, the bean stone bin or the sand and gravel bin for storage, thereby realizing the single transportation of different types of sand and gravel aggregates.

[0030] In this embodiment, the driving mechanism of the bidirectional belt conveyor 1 is arranged outside the tunnel, and the driving mechanism includes three main driving motors 1-1. The three main driving motors 1-1 are all controlled by a PLC controller and a frequency converter.

[0031] In this embodiment, an electrically controlled hydraulic brake roller mechanism is provided on the lower belt of the bidirectional belt conveyor 1, and the electrically controlled hydraulic brake roller mechanism includes multiple hydraulic brake rollers 1-2. The multiple hydraulic brake rollers 1-2 are all controlled by a microcontroller. A speed sensor is provided on the lower belt of the bidirectional belt conveyor 1, and the microcontroller and the speed sensor are both connected to the PLC controller.

[0032] In this embodiment, the number of the hydraulic brake rollers 1 - 2 is three.

[0033] In this embodiment, a tensioning tower 14 is provided on the upper belt of the bidirectional belt conveyor 1 , and a cleaning box 13 is provided on the lower belt of the bidirectional belt conveyor 1 .

[0034] In this embodiment, a traffic tunnel 19 connected to the main tunnel 15 is provided on one side of the branch tunnel 16, and an in-tunnel mixing station 20 is also provided in the cross-enlarged cavern 17 between the main tunnel and the branch tunnel. The in-tunnel mixing station 20 and the in-tunnel sand and gravel aggregate storage bin 8 are respectively arranged on both sides of the cross-enlarged cavern 17 between the main tunnel and the branch tunnel.

[0035] In this embodiment, the sand and gravel aggregate storage bin 9 outside the cave and the sand and gravel aggregate storage bin 8 inside the cave both include a small stone bin, a medium stone bin, a pea stone bin and a sand and gravel bin, and the sand and gravel aggregate storage bin 8 inside the cave is a steel structure storage bin.

[0036] The present invention also provides a method for bidirectional transportation of sand and gravel aggregates and slag materials for long-distance and steep longitudinal slope tunnel construction, the method comprising:

[0037] During the transportation of sand and gravel aggregates, the order in which the five belt conveyors are started is: mobile reversible belt conveyor 7, third large-angle belt conveyor 6, bidirectional belt conveyor 1, first horizontal belt conveyor 3, and first large-angle belt conveyor 2. The order in which the five belt conveyors are stopped is: first large-angle belt conveyor 2, first horizontal belt conveyor 3, bidirectional belt conveyor 1, third large-angle belt conveyor 6, and mobile reversible belt conveyor 7. The transportation process of sand and gravel aggregates is as follows:

[0038] The sand and gravel aggregate in the sand and gravel aggregate storage bin 9 outside the cave is transported to the belt of the first large-angle belt conveyor 2 by using the sand and gravel aggregate upper hopper 10. The sand and gravel aggregate is sequentially transported to the lower belt of the bidirectional belt conveyor 1 through the first large-angle belt conveyor 2 and the first horizontal belt conveyor 3. The sand and gravel aggregate is transported to the third large-angle belt conveyor 6 by the lower belt of the bidirectional belt conveyor 1. After that, the sand and gravel aggregate is transported to the mobile reversible belt conveyor 7 through the third large-angle belt conveyor 6. The mobile reversible belt conveyor 7 transports the sand and gravel aggregate to the small stone silo, the medium stone silo, the pea stone silo or the sand and gravel silo for storage.

[0039] During the slag transportation process, the four belt conveyors start in the following order: the tunnel slag transfer belt conveyor 11, the bidirectional belt conveyor 1, the second horizontal belt conveyor 5, and the second largest angle belt conveyor 4. The four belt conveyors stop in the following order: the second largest angle belt conveyor 4, the second horizontal belt conveyor 5, the bidirectional belt conveyor 1, and the tunnel slag transfer belt conveyor 11. The slag transportation process is as follows:

[0040] The slag in the temporary storage hole 18 in the tunnel is transported to the second large-angle belt conveyor 4 by using the slag upper hopper and the slag crusher. The slag is sequentially transferred to the upper belt of the bidirectional belt conveyor 1 through the second large-angle belt conveyor 4 and the second horizontal belt conveyor 5. The upper belt of the bidirectional belt conveyor 1 transports the sand and gravel aggregate to the slag transfer belt conveyor 11 outside the tunnel, and the slag transfer belt conveyor 11 outside the tunnel transports the slag to the unloading pool 12.

[0041] In this embodiment, the control process during the operation of the bidirectional belt conveyor 1 is as follows: the three main drive motors 1-1 are controlled by the PLC controller and the frequency converter to work simultaneously, driving the belt of the bidirectional belt conveyor 1 to run according to the set belt running speed. During the bidirectional operation of the bidirectional belt conveyor 1, the speed sensor transmits the actual belt running speed detected in real time to the PLC controller, and the PLC controller compares the actual belt running speed detected in real time with the set belt running speed. When the actual belt running speed exceeds the set belt running speed, the PLC controller transmits a control signal to the microcontroller, and the microcontroller controls the operation of multiple hydraulic brake rollers 1-2. At the same time, the frequency converter controls the speed of the three main drive motors 1-1 to reduce the traction force of the main drive motor 1-1 until the bidirectional belt conveyor 1 runs normally according to the set belt running speed; the value range of the set belt running speed is 1.8m / s~2.5m / s.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A bidirectional belt conveyor transport system for long-distance and steep longitudinal slope tunnel construction, characterized by: The invention comprises a bidirectional belt conveyor (1) arranged in a branch tunnel (16) for synchronously discharging slag and transporting sand and gravel aggregates during tunnel construction, a sand and gravel aggregate loading and transporting device and a slag unloading and transporting device arranged outside the tunnel, and a sand and gravel aggregate unloading and transporting device and a slag loading and transporting device arranged in an expanded cavern (17) where the main tunnel and the branch tunnel intersect; the sand and gravel aggregate loading and transporting device comprises an external sand and gravel aggregate storage bin (9) arranged outside the tunnel, a sand and gravel aggregate loading hopper (10), a first large-angle belt conveyor (2) and a first horizontal belt conveyor (3) connected to the discharge end of the first large-angle belt conveyor (2), the discharge end of the first horizontal belt conveyor (3) being connected to the lower belt of the bidirectional belt conveyor (1); the sand and gravel aggregate unloading and transporting device comprises a third large-angle belt conveyor (10) connected to the sand and gravel aggregate discharge end of the bidirectional belt conveyor (1). 6) and a mobile reversible belt conveyor (7) connected to the third large-angle belt conveyor (6), the discharge end of the mobile reversible belt conveyor (7) is provided with an in-hole sand and gravel aggregate storage bin (8); the slag loading and transportation device includes an in-hole slag temporary storage hole (18), a slag loading hopper, a slag crusher, a second large-angle belt conveyor (4) and a second horizontal belt conveyor (5) connected to the discharge end of the second large-angle belt conveyor (4), the discharge end of the second horizontal belt conveyor (5) is connected to the upper belt of the bidirectional belt conveyor (1); the slag unloading and transportation device includes an out-hole slag transfer belt conveyor (11) connected to the slag discharge end of the bidirectional belt conveyor (1) and a discharge pool (12) connected to the discharge end of the out-hole slag transfer belt conveyor (11), and an electric-controlled hydraulic brake roller mechanism is provided on the lower belt of the bidirectional belt conveyor (1).

2. A bidirectional belt conveyor transport system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: The driving mechanism of the bidirectional belt conveyor (1) is arranged outside the tunnel, and the driving mechanism comprises three main driving motors (1-1). The three main driving motors (1-1) are all controlled by a PLC controller and a frequency converter.

3. A bidirectional belt conveyor transport system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: The electronically controlled hydraulic brake roller mechanism comprises a plurality of hydraulic brake rollers (1-2), each of the plurality of hydraulic brake rollers (1-2) being controlled by a microcontroller, a speed sensor being provided on the lower belt of the bidirectional belt conveyor (1), and both the microcontroller and the speed sensor being connected to a PLC controller.

4. A bidirectional belt conveyor transport system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: A tensioning tower (14) is provided on the upper belt of the bidirectional belt conveyor (1), and a cleaning box (13) is provided on the lower belt of the bidirectional belt conveyor (1).

5. A bidirectional belt conveyor transport system for long-distance and steep-slope tunnel construction according to claim 1, characterized in that: The sand and gravel aggregate storage bin (9) outside the cave and the sand and gravel aggregate storage bin (8) inside the cave both include a small stone bin, a medium stone bin, a pea stone bin and a sand and gravel bin, and the sand and gravel aggregate storage bin (8) inside the cave is a steel structure storage bin.

6. A method for bidirectional transportation of sandstone aggregate and slag using the bidirectional belt conveyor transportation system for long-distance and steep longitudinal slope tunnel construction as claimed in claim 1, characterized in that: The method is: During the transportation of sand and gravel aggregates, the order in which the five belt conveyors are started is: the mobile reversible belt conveyor (7), the third largest angle belt conveyor (6), the bidirectional belt conveyor (1), the first horizontal belt conveyor (3) and the first largest angle belt conveyor (2); and the order in which the five belt conveyors are stopped is: the first largest angle belt conveyor (2), the first horizontal belt conveyor (3), the bidirectional belt conveyor (1), the third largest angle belt conveyor (6) and the mobile reversible belt conveyor (7); wherein, the transportation process of sand and gravel aggregates is: The sand and gravel aggregate in the sand and gravel aggregate storage bin (9) outside the cave is transported to the belt of the first large-angle belt conveyor (2) by using the sand and gravel aggregate upper hopper (10); the sand and gravel aggregate is sequentially transported to the lower belt of the bidirectional belt conveyor (1) through the first large-angle belt conveyor (2) and the first horizontal belt conveyor (3); the sand and gravel aggregate is transported to the third large-angle belt conveyor (6) by the lower belt of the bidirectional belt conveyor (1); thereafter, the sand and gravel aggregate is transported to the mobile reversible belt conveyor (7) through the third large-angle belt conveyor (6); the mobile reversible belt conveyor (7) transports the sand and gravel aggregate to the small stone bin, the medium stone bin, the pea stone bin or the sand and gravel bin for storage; During the slag transportation process, the four belt conveyors are started in the following order: the outer slag transfer belt conveyor (11), the bidirectional belt conveyor (1), the second horizontal belt conveyor (5), and the second largest angle belt conveyor (4); and the four belt conveyors are stopped in the following order: the second largest angle belt conveyor (4), the second horizontal belt conveyor (5), the bidirectional belt conveyor (1), and the outer slag transfer belt conveyor (11). The slag transportation process is as follows: The slag in the temporary storage hole (18) in the tunnel is transported to the second large-angle belt conveyor (4) by using the slag upper hopper and the slag crusher. The slag is sequentially transferred to the upper belt of the bidirectional belt conveyor (1) through the second large-angle belt conveyor (4) and the second horizontal belt conveyor (5). The upper belt of the bidirectional belt conveyor (1) transports the sand and gravel aggregate to the slag transfer belt conveyor (11) outside the tunnel. The slag transfer belt conveyor (11) outside the tunnel transports the slag to the unloading pool (12).

7. The method for bidirectional transportation of sandstone aggregate and slag according to claim 6, characterized in that: The control process of the bidirectional belt conveyor (1) during operation is as follows: the three main drive motors (1-1) are controlled by a PLC controller and a frequency converter to work simultaneously, driving the belt of the bidirectional belt conveyor (1) to run according to the set belt running speed; during the bidirectional operation of the bidirectional belt conveyor (1), the speed sensor transmits the actual belt running speed detected in real time to the PLC controller; the PLC controller compares the actual belt running speed detected in real time with the set belt running speed; when the actual belt running speed exceeds the set belt running speed, the PLC controller transmits a control signal to the microcontroller, and the microcontroller controls the operation of multiple hydraulic brake rollers (1-2); at the same time, the frequency converter controls the rotation speed of the three main drive motors (1-1) to reduce the traction force of the main drive motors (1-1) until the bidirectional belt conveyor (1) runs normally according to the set belt running speed; the value range of the set belt running speed is 1.8m / s~2.5m / s.

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