A safety construction platform for overlapping tunnels and its construction method

Abstract

The present application relates to a safety construction platform for overlapping tunnels, which comprises a base, a support frame is fixed on the base, a tunnel construction platform is slidably arranged on the support frame in the vertical direction, a baffle is arranged on one side of the tunnel construction platform, the baffle is parallel to the tunnel construction platform, the baffle slides obliquely upward along the tunnel construction platform, the baffle is used for receiving tunnel floating stones, a driving component for driving the baffle to move is arranged on the tunnel construction platform, the driving component comprises a driving motor, a first transmission gear and a first transmission rack meshing with the first transmission gear, the driving motor is installed at the bottom of the tunnel construction platform, the first transmission gear is coaxially fixed with the output shaft of the driving motor, the first transmission rack is slidably arranged obliquely upward on the side wall of the tunnel construction platform, and the first transmission rack is fixed to the side wall of the baffle. The present application has the effect of improving the safety of tunnel construction.

Description

Technical Field

[0001] This application relates to the field of tunnel processing, and in particular to a safety construction platform for overlapping tunnels and a construction method thereof. Background Art

[0002] With the continuous development of human production and life, the Chinese transportation network has also developed rapidly, and more and more highway and railway tunnels need to be excavated. During tunnel construction, for the tunnel section where it is necessary to repair the top and remove loose stones and drill holes and hang nets, during construction, a scaffolding is usually installed in the tunnel to form a construction platform, and workers stand on the scaffolding for construction.

[0003] However, when workers stand on the scaffolding for construction, the loose stones cleared fall on the ground below, making it easy for passing workers or vehicles below to be hit by the falling loose stones during the construction process, posing a certain safety hazard. Summary of the Invention

[0004] In order to improve the safety of tunnel construction, this application provides a safety construction platform for overlapping tunnels.

[0005] A safety construction platform for overlapping tunnels and a construction method thereof provided by this application adopt the following technical solutions:

[0006] A safety construction platform for overlapping tunnels and a construction method thereof, including a base, a support frame is fixed on the base, a tunnel construction platform is slidably arranged on the support frame in the vertical direction, a baffle is arranged on one side of the tunnel construction platform, the baffle is parallel to the tunnel construction platform, the baffle slides obliquely upward along the tunnel construction platform, the baffle is used for receiving tunnel loose stones, a driving component for driving the baffle to move is arranged on the tunnel construction platform, the driving component includes a driving motor, a first transmission gear and a first transmission rack meshing with the first transmission gear, the driving motor is installed at the bottom of the tunnel construction platform, the first transmission gear is coaxially fixed with the output shaft of the driving motor, the first transmission rack is slidably arranged obliquely upward on the side wall of the tunnel construction platform, and the first transmission rack is fixed to the side wall of the baffle.

[0007] Preferably, the driving component further includes a second transmission gear and a second transmission rack, the second transmission rack is fixed on the side wall of the support frame and arranged in the vertical direction, the second transmission gear is coaxially fixed to the end of the output shaft of the driving motor, and the second transmission gear meshes with the second transmission rack.

[0008] Preferably, a first guiding groove is vertically opened on the side wall of the support frame, a first guiding block is fixed on the side wall of the tunnel construction platform, and the first guiding block is slidably arranged in the guiding groove in the vertical direction.

[0009] Preferably, the baffle includes a connecting frame and a plate body. The connecting frame is fixed to the first transmission rack, the plate body is hinged to the connecting frame, several pins are inserted into the side wall of the connecting frame, and the several pins are arranged at intervals in the horizontal direction. A plurality of jacks are formed in the side wall of the plate body. When the pins are inserted into the jacks, the plate body and the connecting frame are assembled to form the complete baffle.

[0010] Preferably, a buffer pad is arranged on the upper surface of the plate body, and a fence is fixed on the upper surface of the connecting frame, and the fence surrounds the outside of the plate body.

[0011] Preferably, guardrails are hinged on both sides of the upper surface of the tunnel construction platform. A transmission assembly is arranged between the guardrails and the driving motor. Under the cooperation of the transmission assembly, the driving motor controls the lifting of the guardrails.

[0012] Preferably, the transmission assembly includes a belt pulley transmission mechanism and two bevel gears. One of the bevel gears is rotatably carried on the side wall of the tunnel construction platform. The belt pulley transmission mechanism is connected between the output shaft of the driving motor and one of the bevel gears. The other bevel gear is coaxially fixed to the guardrail, and the two bevel gears mesh with each other.

[0013] Preferably, an auxiliary support assembly is arranged between the tunnel construction platform and the base. The auxiliary support assembly includes a support rod and a sliding seat. One end of the support rod is hinged to the bottom of the tunnel construction platform. The sliding seat is slidably arranged on the upper surface of the base in the horizontal direction, and the other end of the support rod is hinged to the sliding seat.

[0014] Preferably, a ladder is arranged on the side wall of the support frame.

[0015] A construction method is implemented by using a safety construction platform for overlapping tunnels as described above, and includes the following steps:

[0016] S1: Position the safety construction platform for overlapping tunnels in the tunnel construction area, ensure that the tunnel construction platform is stably installed on the base, and through the setting and adjustment of the auxiliary support assembly, ensure the stability and safety of the tunnel construction platform at different heights;

[0017] S2: After the tunnel construction platform is positioned, adjust the angle of the baffle according to the construction requirements to ensure that it can effectively block the floating stones on the top of the tunnel. At the same time, control the lifting of the guardrail through the driving motor to provide a safe working environment for the construction personnel;

[0018] S3: During the construction process, according to the construction progress, control the movement of the construction platform in the vertical direction through the driving motor to ensure that the construction personnel can reach different heights of the tunnel for operation;

[0019] S4: After the construction is completed, control the tunnel construction platform to descend smoothly to the ground through the driving motor, and at the same time retract the baffle and guardrail to their initial positions to ensure the complete recovery of the tunnel construction platform and prepare for the next construction.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] By setting adjustable baffles and buffer pads, it effectively prevents the floating stones on the top of the tunnel from directly hitting the staff or equipment below, provides physical protection, and significantly improves the safety of construction personnel. At the same time, the linkage design of the guardrail and the driving motor ensures the safety of construction personnel on the construction platform and reduces accidental falls;

[0022] The sliding design of the construction platform in the vertical direction and the adjustability of the baffle angle enable the platform to adapt to the protection requirements at different heights and construction stages. In addition, the setting of the auxiliary support component ensures the stability and safety of the construction platform when adjusting the height, enhancing the adaptability of the platform;

[0023] The optimized design of the driving component, including the cooperation of the pulley transmission mechanism and the bevel gear, makes the movement of the construction platform and the control of the guardrail more precise and convenient, improving the construction efficiency. At the same time, the setting of the first guide groove and the first guide block ensures the stable movement of the construction platform in the vertical direction, reduces the shaking during the construction process, and further improves the construction efficiency and safety. Description of the Drawings

[0024] Figure 1 is the overall structural schematic diagram of a safety construction platform for an overlapping tunnel in an embodiment of the present application.

[0025] Figure 2 is the cooperation relationship diagram among the tunnel construction platform, baffle, driving component, and transmission component in an embodiment of the present application.

[0026] Description of reference numerals: 1, base; 2, support frame; 21, first guide groove; 22, sliding groove; 23, ladder; 3, tunnel construction platform; 31, first guide block; 32, second guide groove; 4, baffle; 41, connecting frame; 411, bolt; 412, enclosure; 42, plate body; 421, buffer pad; 5, drive assembly; 51, drive motor; 52, first transmission gear; 53, first transmission rack; 531, second guide block; 532, reinforcing rod; 54, second transmission gear; 55, second transmission rack; 6, guardrail; 7, transmission assembly; 71, pulley drive mechanism; 72, bevel gear; 8, auxiliary support assembly; 81, support rod; 82, sliding seat. Detailed implementation manners

[0027] The following further elaborates on this application Figure 1 - Figure 2 in conjunction with the attached drawings.

[0028] An embodiment of this application discloses a safety construction platform for overlapping tunnels. Referring to Figure 1 and Figure 2 , it includes a base 1. The cross-section of the base 1 is U-shaped and is erected on the ground and set horizontally. At the same time, a support frame 2, a tunnel construction platform 3, and a baffle 4 are also provided on the base 1. The support frame 2 is used to support and carry the tunnel construction platform 3. The tunnel construction platform 3 is set horizontally and is in a cuboid shape for construction workers to stand and work. The baffle 4 is arranged on one side of the tunnel construction platform 3 to receive the tunnel floating stones generated during construction.

[0029] Therefore, through the ingenious design of the base 1, the support frame 2, the tunnel construction platform 3, and the baffle 4, a safe and efficient working environment is provided for tunnel construction. The base 1 has a U-shaped cross-section and is stably erected on the ground. The support frame 2 carries the horizontally arranged tunnel construction platform 3, providing a safe working surface for construction workers. The baffle 4 is arranged on one side of the tunnel construction platform 3 to effectively receive the floating stones generated during construction, ensuring the safety of construction workers.

[0030] Specifically, there are two groups of support frames 2. The two groups of support frames are respectively located on both sides of the upper surface of the base 1. The support frame 2 is vertically fixed to the base 1 and is arranged vertically. The tunnel construction platform 3 is slidably arranged vertically between the two groups of support frames 2. Among them, a first guide groove 21 is opened vertically on the side wall of the support frame 2. At the same time, first guide blocks 31 are fixed on both sides of the tunnel construction platform 3. The cross-sections of the first guide blocks 31 and the first guide groove 21 are both T-shaped. The first guide blocks 31 are slidably arranged vertically in the guide groove to realize the connection between the tunnel construction platform 3 and the support frame 2.

[0031] Further, the baffle 4 is horizontally arranged and slides obliquely upward along the tunnel construction platform 3. After the baffle 4 slides obliquely upward along the tunnel construction platform 3 for a certain distance, the baffle 4 can reach below the area where the construction workers carry out manual operations corresponding to the tunnel top.

[0032] Correspondingly, a driving assembly 5 for realizing the sliding of the tunnel construction platform 3 and the sliding of the baffle 4 is directly arranged corresponding to the tunnel construction platform 3 and the support frame 2.

[0033] Specifically, the driving assembly 5 includes a driving motor 51, a first transmission gear 52, a first transmission rack 53 meshing with the first transmission gear 52, a second transmission gear 54, and a second transmission rack 55 meshing with the second transmission gear 54. Among them, the driving motor 51 is fixed on the lower surface of the tunnel construction platform 3. In this embodiment, the driving motor 51 is set as a double-shaft motor, and the output shaft of the driving motor 51 is arranged along the length direction of the tunnel construction platform 3.

[0034] Further, there are two first transmission gears 52, and the two first transmission gears 52 are coaxially fixed with the two output shafts of the driving motor 51 respectively. There are also two first transmission racks 53, and the two first transmission racks 53 are respectively arranged to slide obliquely upward on the two side walls of the tunnel construction platform 3. Specifically, second guiding grooves 32 are formed on the two side walls of the tunnel construction platform 3, and the second guiding grooves 32 are obliquely arranged. At the same time, a second guiding block 531 is fixed on the back surface of the first transmission rack 53, and the second guiding block 531 is arranged to slide in the second guiding groove 32 along the length direction of the second guiding groove 32, so as to realize the movement guiding of the first transmission rack 53.

[0035] In addition, the first transmission rack 53 is fixed to the side wall of the baffle 4, and a reinforcing rod 532 is further arranged between the side wall of the baffle 4 and the side wall of the first transmission rack 53. The two ends of the reinforcing rod 532 are respectively fixed to the side wall of the baffle 4 and the side wall of the first transmission rack 53, so as to form a stable triangular structure among the first transmission rack 53, the baffle 4 and the reinforcing rod 532, and further increase the bearing capacity of the baffle 4.

[0036] Therefore, by driving the first transmission gear 52 to rotate through the driving motor 51, the first transmission rack 53 meshing with it is driven to slide obliquely along the second guiding groove 32 on the side wall of the tunnel construction platform 3. This sliding action directly drives the baffle 4 to slide obliquely upward to below the area where the construction workers carry out manual operations corresponding to the tunnel top, providing safety protection for the construction workers. During this process, the second guiding block 531 slides in the second guiding groove 32 to accurately guide the movement of the rack, realizing the accurate positioning and stable movement of the baffle 4, thereby ensuring the safety of the construction platform and the accuracy of the operation.

[0037] Further, there are two corresponding second transmission racks 55, which are respectively fixed on the side walls of the two support frames 2 and arranged vertically. Correspondingly, there are also two second transmission gears 54, which are respectively coaxially fixed on the two output shafts of the driving motor 51.

[0038] Therefore, it is realized by driving the second transmission gear 54 to rotate by the driving motor 51, and then driving the second transmission rack 55 engaged with it to slide vertically along the side wall of the support frame 2. Specifically, the two output shafts of the driving motor 51 are respectively coaxially fixed with the two second transmission gears 54, and these two second transmission gears 54 are respectively engaged with the two second transmission racks 55 fixed on the side walls of the support frame 2. When the driving motor 51 is started, the second transmission gear 54 rotates, driving the second transmission rack 55 to slide vertically, so as to realize the rise or fall of the tunnel construction platform 3, and thus realize the storage or operation of the tunnel construction platform 3.

[0039] In summary, using the same driving motor 51 as the only power source for two sets of mechanisms (the baffle 4 sliding mechanism and the tunnel construction platform 3 lifting mechanism) in the overlapping tunnel safety construction platform realizes the efficient integration and optimization of the power system. This design not only simplifies the power transmission system, reduces the complexity and cost of the equipment, but also improves the reliability and maintenance convenience of the system. By precisely controlling the rotation speed and direction of the driving motor 51, the position of the baffle 4 and the height of the construction platform can be adjusted synchronously or independently, ensuring the safety and flexibility during the construction process, while reducing energy consumption and improving the overall construction efficiency.

[0040] On the other hand, the baffle 4 includes a connecting frame 41 and a plate body 42. The cross-section of the connecting frame 41 is arranged in a U shape. The two arms of the connecting frame 41 are respectively fixed to the two sets of first transmission racks 53. The plate body 42 is hinged to the connecting frame 41. A number of pins 411 are inserted into the side wall of the connecting frame 41, and the number of pins 411 are arranged at intervals in the horizontal direction. A number of jacks (not shown in the figure) are opened on the side wall of the plate body 42. When the pins 411 are inserted into the jacks, the plate body 42 and the connecting frame 41 are joined together to form a complete baffle 4.

[0041] Correspondingly, in the safety construction platform for overlapping tunnels, the process of rotating the baffle 4 to clean the floating stones is achieved through the ingenious design of the connecting frame 41 and the plate body 42. The U-shaped cross-section structure of the connecting frame 41 ensures its stable connection with the first transmission rack 53, while the hinged design of the plate body 42 and the connecting frame 41 allows the plate body 42 to rotate relative to the connecting frame 41. When it is necessary to clean the floating stones on the baffle 4, the operator can pull out the pin 411 from the jack to release the locking state between the plate body 42 and the connecting frame 41, enabling the plate body 42 to rotate freely. At this time, the plate body 42 can be rotated manually or by a driving mechanism to pour or sweep out the floating stones attached to the surface of the baffle 4, thereby keeping the baffle 4 clean and reducing the accumulation of floating stones from affecting the construction safety and efficiency. After the cleaning is completed, the operator resets the plate body 42 and inserts the pin 411 into the jack again to lock the plate body 42 and the connecting frame 41, ensuring the stability and safety of the baffle 4 during the construction process. This design not only simplifies the cleaning process of the baffle 4 but also improves the maintenance efficiency of the construction platform and the convenience of operation.

[0042] Furthermore, a buffer pad 421 is fixed on the upper surface of the plate body 42, and a retaining wall 412 is fixed on the upper surface of the connecting frame 41. The retaining wall 412 encloses the outside of the plate body 42, and the cross-section of the retaining wall 412 is U-shaped, with the opening of the retaining wall 412 facing the tunnel construction platform 3.

[0043] In this embodiment, the buffer pad 421 is usually made of high-elasticity and wear-resistant materials such as rubber or polyurethane. These materials can effectively absorb the impact force, prevent the floating stones or tools dropped during the construction process from damaging the baffle 4, and at the same time reduce the noise, providing a safer and quieter working environment for the construction workers.

[0044] In addition, the design of the retaining wall 412 surrounds the outside of the plate body 42 to form a closed protection structure. It can not only prevent the construction materials or tools from accidentally slipping but also block the dust and gravel in the tunnel to a certain extent, providing a relatively clean working space for the construction workers. This comprehensive protection measure not only improves the construction efficiency but also significantly enhances the safety performance of the construction platform, ensuring the smooth progress of the construction process.

[0045] On the other hand, guardrails 6 are hinged on both sides of the upper surface of the tunnel construction platform 3. The two guardrails 6 are symmetrically arranged, and a transmission component 7 is provided between the guardrail 6 and the driving motor 51. With the cooperation of the transmission component 7, the driving motor 51 controls the guardrail 6 to lift.

[0046] Specifically, the transmission assembly 7 includes a pulley drive mechanism 71 and two bevel gears 72. One of the bevel gears 72 is rotatably carried on the side wall of the tunnel construction platform 3. The pulley drive mechanism 71 is connected between the output shaft of the drive motor 51 and one of the bevel gears 72. The other bevel gear 72 is coaxially fixed with the guardrail 6, and the two bevel gears 72 mesh with each other.

[0047] Therefore, the transmission assembly 7 consists of a pulley drive mechanism 71 and two bevel gears 72. One of the bevel gears 72 is fixed on the side wall of the tunnel construction platform 3, and the pulley drive mechanism 71 connects the output shaft of the drive motor 51 and this bevel gear 72 to achieve power transmission. When the drive motor 51 is started, the rotational force output by it is transmitted to the first bevel gear 72 through the pulley drive mechanism 71, and then this bevel gear 72 drives the other bevel gear 72 coaxially fixed with the guardrail 6 to rotate by means of gear meshing. Since the two bevel gears 72 mesh with each other, when one rotates, the other rotates in the opposite direction, thereby driving the guardrail 6 coaxially fixed with it to lift or lower, ensuring the synchronous movement of the guardrails 6 on both sides. The guardrail 6 on the tunnel construction platform 3 mainly plays a protective role, preventing construction workers from accidentally falling during operation and ensuring construction safety. At the same time, the guardrail 6 can also effectively block the accidental sliding of construction materials or tools, reduce the harm to the personnel or equipment below, improve the safety of the construction platform, and at the same time simplify the operation process, enabling construction workers to focus more on the construction task and reducing potential safety hazards caused by improper operation.

[0048] On the other hand, two sets of symmetrically arranged auxiliary support assemblies 8 are provided between the tunnel construction platform 3 and the base 1. The auxiliary support assembly 8 includes a support rod 81 and a sliding seat 82. One end of the support rod 81 is hinged to the bottom of the tunnel construction platform 3. A sliding groove 22 is opened on the upper surface of the base 1 along its width direction. The sliding seat 82 is horizontally slidably arranged in the sliding groove 22 on the upper surface of the base 1. The cross-sections of the sliding groove 22 and the sliding seat 82 are both T-shaped, and the other end of the support rod 81 is hinged to the sliding seat 82.

[0049] Therefore, in the design of the overlapping tunnel safety construction platform, the ingenious application of the auxiliary support assembly 8 significantly enhances the stability and adaptability of the platform. Through the cooperation of two groups of symmetrically arranged support rods 81 and sliding seats 82, the construction platform can adjust the distance between itself and the base 1 according to actual needs, ensuring good stability under different terrains and working conditions. One end of the support rod 81 is hinged to the bottom of the construction platform, and the other end is hinged to the sliding seat 82, while the sliding seat 82 freely slides horizontally within the T-shaped sliding groove 22 on the upper surface of the base 1. This design not only allows the construction platform to adjust its height in the vertical direction but also enables fine-tuning in the horizontal direction to adapt to the uneven ground inside the tunnel or changes in construction requirements. The combination of the T-shaped cross-section sliding groove 22 and the sliding seat 82 effectively prevents the lateral offset of the sliding seat 82 during the sliding process, ensuring the stability of the support structure. Therefore, the auxiliary support assembly 8 not only improves the operation safety of the construction platform but also enhances its adaptability and working efficiency in complex environments.

[0050] In addition, a ladder 23 is provided on the side wall of the support frame 2. As a fixing device on the side wall of the support frame 2, the ladder 23 provides a safe and convenient up-and-down passage for construction workers, ensuring their movement safety when working at different heights. At the same time, the setting of the ladder 23 also facilitates construction workers to carry tools and materials, improving construction efficiency and convenience.

[0051] The embodiment of the present application also discloses a construction method implemented using the above-mentioned safety construction platform for overlapping tunnels, including the following steps:

[0052] S1: Position the overlapping tunnel safety construction platform in the tunnel construction area, ensure that the tunnel construction platform 3 is firmly installed on the base 1, and through the setting and adjustment of the auxiliary support assembly 8, ensure the stability and safety of the tunnel construction platform 3 at different heights;

[0053] S2: After the tunnel construction platform 3 is positioned, adjust the angle of the baffle 4 according to construction requirements to ensure that it can effectively block the floating stones on the top of the tunnel. At the same time, control the lifting of the guardrail 6 through the driving motor 51 to provide a safe working environment for construction workers;

[0054] S3: During the construction process, control the movement of the construction platform in the vertical direction through the driving motor 51 according to the construction progress to ensure that construction workers can reach different heights of the tunnel for operation;

[0055] S4: After the construction is completed, control the tunnel construction platform 3 to descend smoothly to the ground through the driving motor 51, and at the same time retract the baffle 4 and the guardrail 6 to their initial positions to ensure the complete recovery of the tunnel construction platform 3 and make preparations for the next construction.

[0056] Therefore, the construction method of the overlapping tunnel safety construction platform disclosed in the embodiments of the present application ensures the stability and safety of the construction platform during operations at different heights through precise positioning, stable installation, and combined with the flexible adjustment of the auxiliary support component 8. The adjustable angle of the baffle 4 effectively protects construction workers from the threat of floating stones on the top of the tunnel, while the automatic control of the guardrail 6 further enhances the safety of the working environment. The mobility of the construction platform in the vertical direction enables construction workers to efficiently reach any height inside the tunnel for operations, greatly improving the construction efficiency. After the construction is completed, the smooth descent of the platform and the automatic recovery of the baffle 4 and the guardrail 6 not only ensure the complete recovery of the equipment but also facilitate the rapid preparation for subsequent construction, significantly improving the safety and efficiency of the overlapping tunnel construction as a whole.

[0057] The implementation principle of the safety construction platform for an overlapping tunnel in the embodiments of the present application is as follows: Through the integration of a variety of innovative designs and automated controls, efficient and safe operations during the tunnel construction process are achieved. First, the platform ensures stability at different terrains and heights through the dynamic adjustment of the auxiliary support component 8, providing a safe working environment for construction workers. Second, the adjustability and automated control of the baffle 4 and the guardrail 6 effectively prevent the threat of floating stones on the top of the tunnel and provide additional safety protection for construction workers. Third, the vertical movement ability of the tunnel construction platform 3 enables construction workers to flexibly adjust the operation height according to the construction progress, improving the construction efficiency. Finally, after the construction is completed, the smooth descent and automatic recovery mechanism of the tunnel construction platform 3 ensure the complete recovery of the equipment and facilitate the rapid preparation for subsequent construction. Through these innovative designs, the overall solution significantly improves the safety and efficiency of the overlapping tunnel construction, bringing substantial technological progress to the field of tunnel engineering.

[0058] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A safety construction platform for overlapping tunnels, characterized in that: It includes a base (1), a support frame (2) is fixed on the base (1), a tunnel construction platform (3) is slidably arranged on the support frame (2) in the vertical direction, a baffle (4) is arranged on one side of the tunnel construction platform (3), the baffle (4) is parallel to the tunnel construction platform (3), the baffle (4) slides obliquely upward along the tunnel construction platform (3), the baffle (4) is used for receiving tunnel floating stones, a driving assembly (5) for driving the baffle (4) to move is arranged on the tunnel construction platform (3), the driving assembly (5) includes a driving motor (51), a first transmission gear (52) and a first transmission rack (53) meshing with the first transmission gear (52), the driving motor (51) is installed at the bottom of the tunnel construction platform (3), the first transmission gear (52) is coaxially fixed with the output shaft of the driving motor (51), the first transmission rack (53) is slidably arranged obliquely upward on the side wall of the tunnel construction platform (3), and the first transmission rack (53) is fixed to the side wall of the baffle (4); The driving assembly (5) further includes a second transmission gear (54) and a second transmission rack (55), the second transmission rack (55) is fixed to the side wall of the support frame (2) and arranged in the vertical direction, the second transmission gear (54) is coaxially fixed to the end of the output shaft of the driving motor (51), and the second transmission gear (54) meshes with the second transmission rack (55); The baffle (4) includes a connecting frame (41) and a plate body (42), the connecting frame (41) is fixed to the first transmission rack (53), the plate body (42) is hinged to the connecting frame (41), a plurality of pins (411) are inserted into the side wall of the connecting frame (41), the plurality of pins (411) are arranged at intervals in the horizontal direction, a plurality of jacks are formed in the side wall of the plate body (42), when the pins (411) are inserted into the jacks, the plate body (42) and the connecting frame (41) are assembled to form the complete baffle (4); Guardrails (6) are hinged on both sides of the upper surface of the tunnel construction platform (3), a transmission assembly (7) is arranged between the guardrail (6) and the driving motor (51), and under the cooperation of the transmission assembly (7), the driving motor (51) controls the guardrail (6) to lift up; The transmission assembly (7) includes a pulley transmission mechanism (71) and two bevel gears (72), one of the bevel gears (72) is rotatably carried on the side wall of the tunnel construction platform (3), the pulley transmission mechanism (71) is connected between the output shaft of the driving motor (51) and one of the bevel gears (72), the other bevel gear (72) is coaxially fixed to the guardrail (6), and the two bevel gears (72) mesh with each other; The side wall of the support frame (2) is provided with a first guiding groove (21) in the vertical direction, and a first guiding block (31) is fixed to the side wall of the tunnel construction platform (3). The first guiding block (31) is slidably arranged in the guiding groove in the vertical direction; An auxiliary support assembly (8) is arranged between the tunnel construction platform (3) and the base (1). The auxiliary support assembly (8) includes a support rod (81) and a sliding seat (82). One end of the support rod (81) is hinged to the bottom of the tunnel construction platform (3), the sliding seat (82) is slidably arranged on the upper surface of the base (1) in the horizontal direction, and the other end of the support rod (81) is hinged to the sliding seat (82).

2. The safety construction platform for an overlapping tunnel according to claim 1, characterized in that: A ladder (23) is arranged on the side wall of the support frame (2).

3. A construction method is implemented by using the safety construction platform for overlapping tunnels according to any one of claims 1-2, and includes the following steps: S1: Position the safety construction platform for overlapping tunnels in the tunnel construction area, ensure that the tunnel construction platform (3) is firmly installed on the base (1), and through the setting and adjustment of the auxiliary support assembly (8), ensure the stability and safety of the tunnel construction platform (3) at different heights; S2: After the tunnel construction platform (3) is positioned, adjust the angle of the baffle (4) according to the construction requirements to ensure that it can effectively block the floating stones at the top of the tunnel. At the same time, control the lifting of the guardrail (6) through the driving motor (51) to provide a safe working environment for the construction workers; S3: During the construction process, control the movement of the construction platform in the vertical direction through the driving motor (51) according to the construction progress to ensure that the construction workers can reach different heights of the tunnel for operation; S4: After the construction is completed, control the tunnel construction platform (3) to smoothly descend to the ground through the driving motor (51), and at the same time, retract the baffle (4) and the guardrail (6) to the initial positions to ensure the complete recovery of the tunnel construction platform (3) and make preparations for the next construction.

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