Tunnel construction platform

Abstract

The present invention proposes a tunnel construction platform, which relates to the technical field of tunnel construction equipment, including a base, a piston driving mechanism, a crank mechanism and a working platform. The base is provided with a supporting plate, and the bottom of the working platform is provided with a connecting plate. The piston driving mechanism includes a piston chamber provided on the base and a piston plate provided in the piston chamber, a push rod is fixed on the piston plate, and a water pump is connected to the piston chamber. The crank mechanism includes a pair of symmetrically arranged driving cranks and a pair of driven rods, and the intersection of the long handle and the short handle of the driving crank is pivotally connected to the supporting plate, the end of the short handle is pivotally connected to the driven rod, and the end of the driven rod away from the short handle is pivotally connected to the connecting plate. The water pump pumps water into the piston chamber, and the driving piston plate drives the push rod to float between the two long handles, so that the two driving cranks rotate around the pivot end, and drive the driven rod to lift the working platform upward, so as to solve the problem that the initial impact force of the existing tunnel construction platform is large and the lifting process is fast, which makes people easy to fall or collide.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction equipment, and specifically provides a tunnel construction platform. Background Art

[0002] China's transportation network is developing rapidly, and more and more highway and railway tunnels need to be excavated. During tunnel construction, there is a section of tunnel between the excavation face and the completed secondary lining tunnel that needs to be repaired, pumice removed, and holes and mesh hanging operations. When constructing the tunnel section, construction workers need to use auxiliary tools to rise to a higher place to work. Due to the dim light in the tunnel and the poor construction environment, the ascent and descent process needs to be carried out smoothly. The existing construction platform has a large impact force at the beginning of the rise and fall, and construction workers may not be able to stand steadily, and there is a risk of falling from the construction platform or collision.

[0003] Accordingly, the art needs a tunnel construction platform to solve the above problems. Summary of the invention

[0004] The present invention provides a tunnel construction platform, which solves the problem in the prior art that the initial impact force of the tunnel construction platform is large and the lifting process is fast, which makes construction workers easily fall from the construction platform or collide.

[0005] The technical solution of the present invention is implemented as follows: a tunnel construction platform includes a base, a piston driving mechanism, a crank mechanism and a working platform, the upper end surface of the base is provided with a support plate, the bottom of the working platform is provided with a connecting plate, the piston driving mechanism includes a piston chamber provided on the base and a piston plate provided in the piston chamber, the size of the piston plate is equal to the transverse cross-sectional size of the inner cavity of the piston chamber, and the piston plate and the piston chamber are provided with a sliding seal, a push rod is fixedly provided on the upper end surface of the piston plate, the push rod passes through the top of the piston chamber, the bottom of the piston chamber is connected to a water pump, and the crank mechanism includes a pair of A pair of driving cranks and a pair of driven rods are provided, the driving crank is in the shape of "7", including a long handle and a short handle, the intersection of the long handle and the short handle is pivotally connected to the side wall of the support plate, the end of the short handle is pivotally connected to one end of the driven rod, the ends of the two driven rods away from the short handles are inclined toward each other and are pivotally connected to the connecting plate, forming a structure in which the water pump pumps water into the piston chamber, the water drives the piston plate and the push rod to float, the push rod extends between the ends of the two long handles, so that the ends of the two long handles move around the pivot end in a direction away from each other, and the short handle rotates upward around the pivot end to drive the driven rod to lift the working platform upward.

[0006] The technical effect of this scheme is: water is pumped into the piston chamber by a water pump to realize the push rod driving the crank mechanism to lift the working platform upward; the water in the piston chamber is pumped out by the water pump to realize the push rod falling and the crank mechanism lowering the working platform; because the water in the piston chamber gradually increases or decreases, and the push rod is required to transmit the driving force to the crank mechanism, the working platform will not be suddenly subjected to a large impact force at the beginning of rising and falling, thereby ensuring the stability of the working platform at the beginning of lifting, and the working platform is also relatively smooth during the lifting process, thereby preventing the construction personnel on the working platform from falling or bumping due to unstable standing; when tunnel construction is carried out in certain terrain conditions, there will be groundwater. When treating the groundwater, part of the groundwater can be used for the lifting of the working platform, which not only makes reasonable use of the groundwater, but also brings convenience to the use of the tunnel construction platform in the tunnel.

[0007] In the preferred technical solution of the above-mentioned tunnel construction platform, the support plates are arranged to form a quadrangular prism structure, wherein the crank mechanisms are provided on a pair of oppositely arranged support plates, the push rods are provided at positions of the piston plate corresponding to the two crank mechanisms, and the connecting plates are provided at positions of the bottom of the working platform corresponding to the two crank mechanisms, and when there is no water in the piston chamber, the working platform is located on the upper end of the quadrangular prism structure.

[0008] The technical effect of this solution is: two crank mechanisms are set on the tunnel construction platform, and are driven separately by two push rods on a piston plate in a piston chamber, ensuring that the two push rods drive the two crank mechanisms at the same time, thereby improving the stability of the crank mechanism lifting work platform; the working platform is located on a quadrangular prism structure, which reduces the burden on the crank mechanism and ensures the stability of the initial state of the tunnel construction platform.

[0009] In the preferred technical solution of the above-mentioned tunnel construction platform, the two driven rods of the crank mechanism are pivotally connected to the center position of the connecting plate, and an extension plate is provided at the bottom of the working platform. The extension plate is arranged around the outside of the quadrangular prism structure, and the dimension of the extension plate in the vertical direction is not less than the highest driving height of the crank mechanism. The connecting plate is arranged on the extension plate, and the center point of the connecting plate is located in the same plane as a median line of the working platform.

[0010] The technical effect of this solution is: the force exerted by the driven rod on the working platform is perpendicular to a median line of the working platform, so that the driving force of the crank mechanism on the working platform is more concentrated and the process of driving the working platform to rise and fall is smoother; the setting of the extension plate enables the working platform to rise and fall along the four-prism structure formed by the support plate, avoiding shaking of the working platform during the lifting process, and further improving the reliability and stability of the tunnel construction platform.

[0011] In the preferred technical solution of the above-mentioned tunnel construction platform, a pulley is provided at the end of the long handle, and when there is no water in the piston chamber, the top of the push rod abuts against the pulley.

[0012] The technical effect of this solution is that the setting of the pulley is conducive to the push rod smoothly entering upward between the ends of the two long handles, thereby ensuring the reliability of the push rod driving the driving crank.

[0013] In the preferred technical solution of the above-mentioned tunnel construction platform, the push rod includes a column section and a cone section, the column section passes through the top of the piston chamber and is connected to the cone section, and the top of the cone section is located at an end away from the column section.

[0014] The technical effect of this solution is: as the conical section gradually extends between the long handles of the driving crank, the distance between the ends of the two long handles gradually increases, that is, the short handle gradually drives the driven rod upward, and the driven rod gradually lifts the working platform upward, so that the lifting height of the working platform can be adjusted.

[0015] In the preferred technical solution of the above-mentioned tunnel construction platform, a water storage chamber is provided on the base, and the water pump is respectively connected to the water storage chamber and the piston chamber.

[0016] The technical effect of this solution is that when there is no water source, water can be stored in the water storage chamber for use when raising and lowering the working platform.

[0017] In the preferred technical solution of the above-mentioned tunnel construction platform, a controller is provided on the working platform, and a signal receiver is provided on the water pump.

[0018] The technical effect of this scheme is: the construction personnel standing on the working platform send control signals through the controller, and the signal receiver on the water pump controls the water pump to start or stop pumping water after receiving the control signal, thereby realizing the intelligent control of the tunnel construction platform and ensuring the convenience and timeliness of controlling the lifting of the working platform.

[0019] In the preferred technical solution of the above-mentioned tunnel construction platform, the working platform is provided with a guardrail along its circumference, and a protective cover is provided on the top of the guardrail.

[0020] The technical effect of this scheme is: when the tunnel section is being constructed, the loose surrounding rock on the top of the cave may fall at any time, which poses a great safety hazard to the construction workers in the tunnel. By setting up a protective cover, the construction workers can be prevented from being injured by falling rocks and the safety of the tunnel construction platform can be improved.

[0021] In the preferred technical solution of the above-mentioned tunnel construction platform, an arc-shaped bracket is arranged on the top of the guardrail, a guide rail is opened on the arc-shaped bracket, and a sliding block adapted to the guide rail is arranged on the protective cover.

[0022] The technical effect of this solution is: since construction workers need to carry out construction on the tunnel section, after the lifting is completed and stabilized, the protective cover can be partially opened along the guide rail on the arc-shaped bracket to facilitate the construction workers' work. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a front view of the tunnel construction platform of the present invention;

[0025] Figure 2 It is a side view of the tunnel construction platform of the present invention;

[0026] Figure 3 It is a first state diagram of the piston drive mechanism and the crank mechanism of the tunnel construction platform of the present invention;

[0027] Figure 4 A second state diagram of the piston drive mechanism and the crank mechanism of the tunnel construction platform of the present invention;

[0028] List of reference numerals: 1. base; 11. support plate; 12. universal wheel; 13. water storage chamber; 2. piston drive mechanism; 21. piston chamber; 22. piston plate; 23. push rod; 231. column section; 232. cone section; 3. crank mechanism; 31. driving crank; 311. long handle; 312. short handle; 313. pulley; 32. driven rod; 4. working platform; 41. connecting plate; 42. extension plate; 43. guardrail; 431. arc bracket; 432. guide rail; 44. protective cover; 441. slider; 5. water pump. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that, in the description of the present invention, terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The specific embodiment of the tunnel construction platform of the present invention is as follows: Figures 1 to 4 As shown, a tunnel construction platform includes a base 1, a piston drive mechanism 2, a crank mechanism 3 and a working platform 4. The upper end surface of the base 1 is provided with a support plate 11, and the bottom of the working platform 4 is provided with a connecting plate 41. The piston drive mechanism 2 includes a piston chamber 21 provided on the base 1 and a piston plate 22 provided in the piston chamber 21. The size of the piston plate 22 is equal to the transverse cross-sectional size of the inner cavity of the piston chamber 21, and the piston plate 22 and the piston chamber 21 are provided with a sliding seal. A push rod 23 is fixedly provided on the upper end surface of the piston plate 22, and the push rod 23 passes through the top of the piston chamber 21. The bottom of the piston chamber 21 is connected to a water pump 5. The crank mechanism 3 includes a pair of symmetrically arranged driving cranks 31 and a pair of driven rods 32. The driving crank 31 is in a "7" shape and includes a long handle 31. 1 and a short handle 312, the intersection of the long handle 311 and the short handle 312 is pivotally connected to the side wall of the support plate 11, and the pivot connection position is fixed, the end of the short handle 312 is pivotally connected to one end of the driven rod 32, and the pivot connection position can move with the movement of the short handle 312 and the driven rod 32, the ends of the two driven rods 32 away from the short handle 312 are inclined toward each other and are pivotally connected to the connecting plate 41, the water pump 5 pumps water from the bottom of the piston chamber 21 into the piston chamber 21, the water drives the piston plate 22 and the push rod 23 to float, the push rod 23 extends between the ends of the two long handles 311, so that the ends of the two long handles 311 move around the pivot end in a direction away from each other, the short handle 312 rotates upward around the pivot end to drive the driven rod 32 to lift the working platform 4 upward.

[0033] The water pump 5 is a two-way water pump. The water pump 5 pumps water into the piston chamber 21 to realize the push rod 23 driving the crank 31 mechanism 3 to lift the working platform 4 upward; the water in the piston chamber 21 is pumped out by the water pump 5 to realize the push rod 23 falling and the crank mechanism 3 lowering the working platform 4; because the water in the piston chamber 21 gradually increases or decreases, and the push rod 23 is required to transmit the driving force to the crank mechanism 3, the working platform 4 will not be suddenly subjected to a large impact force at the beginning of rising and falling, thereby ensuring the stability of the working platform 4 at the beginning of lifting and lowering. At the same time, the working platform 4 is also relatively smooth during the lifting process, thereby preventing the construction personnel on the working platform 4 from falling or bumping due to unstable standing; when tunnel construction is carried out in certain conditions, there will be groundwater. When treating the groundwater, part of the groundwater can be used for the lifting and lowering of the working platform 4, which not only makes reasonable use of the groundwater, but also brings convenience to the use of the tunnel construction platform in the tunnel.

[0034] Preferably, the support plates 11 are arranged to form a quadrangular prism structure, wherein a pair of oppositely arranged support plates 11 are each provided with a crank mechanism 3, push rods 23 are respectively provided at positions of the piston plate 22 corresponding to the two crank mechanisms 3, and connecting plates 41 are respectively provided at positions of the bottom of the working platform 4 corresponding to the two crank mechanisms 3. When there is no water in the piston chamber 21, the working platform 4 is located at the upper end of the quadrangular prism structure and the piston plate 22 falls to the bottom of the piston chamber 21.

[0035] Two crank mechanisms 3 are arranged on the tunnel construction platform and are driven respectively by two push rods 23 on a piston plate 22 in a piston chamber 21, thereby ensuring that the two push rods 23 drive the two crank mechanisms 3 at the same time, thereby improving the stability of the crank mechanism 3 in lifting the working platform 4; the working platform 4 is located on a quadrangular prism structure, which reduces the burden on the crank mechanism 3 and ensures the stability of the initial state of the tunnel construction platform.

[0036] It can be understood that although the piston plates 22 in the piston chamber 21 described in the above embodiment are respectively provided with push rods 23 at positions corresponding to the two crank mechanisms 3, this is only one implementation method. For example, two piston chambers 21 and corresponding two water pumps 5 can also be set on the base 1, and the piston plate 22 in each piston chamber 21 is provided with a push rod 23 corresponding to the corresponding crank mechanism 3, and the construction personnel can control the two water pumps 5 to drive simultaneously; it can also be understood that the crank mechanism 3 is provided on one of the pairs of relatively arranged support plates 11 described in the above embodiment, which is also only one implementation method. For example, the crank mechanism 3 can also be provided on the four support plates 11 forming a quadrangular prism structure, and four push rods 23 are provided on the corresponding piston plates 22. Those skilled in the art can reasonably set the number and matching relationship of the piston chambers 21 and the crank mechanisms 3 according to actual conditions and needs.

[0037] Preferably, the two driven rods 32 of the crank mechanism 3 are pivotally connected to the center position of the connecting plate 41, and an extension plate 42 is arranged at the bottom of the working platform 4. The extension plate 42 is arranged around the outside of the quadrangular prism structure, and the dimension of the extension plate 42 along the vertical direction is equal to the highest driving height of the crank mechanism 3. The connecting plate 41 is arranged on the extension plate 42, and the center point of the connecting plate 41 is located in the same plane as a median line of the working platform 4.

[0038] The force exerted by the driven rod 32 on the working platform 4 is perpendicular to a midline of the working platform 4, so that the driving force of the crank mechanism 3 on the working platform 4 is more concentrated and the process of driving the working platform 4 to rise and fall is smoother; the setting of the extension plate 42 enables the working platform 4 to rise and fall along the quadrangular column structure formed by the support plate 11, avoiding shaking of the working platform 4 during the lifting process, and further improving the reliability and stability of the tunnel construction platform.

[0039] It can be understood that the vertical dimension of the extension plate 42 described in the above embodiment being equal to the maximum driving height of the crank mechanism 3 is only one implementation method. The vertical dimension of the extension plate 42 can also be set to be larger than the maximum driving height of the crank mechanism 3. Those skilled in the art can reasonably set the vertical dimension of the extension plate 42 according to actual conditions and needs. It should be noted that when the vertical dimension of the extension plate 42 is relatively large and interferes with the pivotal connection position of the driving crank 31 on the support plate 11, the extension plate 42 can be grooved at a position above the pivotal connection position of the driving crank 31 and the support plate 11, and the length of the groove is sufficient to ensure that the extension plate 42 does not interfere with the operation of the driving crank 31.

[0040] It can also be understood that the pivotal connection between the two follower rods 32 and the connecting plate 41 at the center position described in the above embodiment is not a limitation on the connection position of the follower rods 32 and the connecting plate 41. For example, the two follower rods 32 can also be connected to different positions on the connecting plate 41 respectively. However, in order to ensure the stability of the lifting and lowering of the working platform 4, the connection position of the two follower rods 32 and the connecting plate 41 must be located on the same horizontal line. Those skilled in the art can reasonably set the connection position of the two follower rods 32 and the connecting plate 41 according to actual conditions and needs.

[0041] like Figure 3 As shown, preferably, the push rod 23 includes a column section 231 and a conical section 232, the column section 231 passes through the top of the piston chamber 21 and is connected to the conical section 232, the top of the conical section 232 is located at an end away from the column section 231, and a pulley 313 is provided at the end of the long handle 311. When there is no water in the piston chamber 21, the top of the push rod 23 abuts against the pulley 313.

[0042] As the conical section 232 gradually extends into the long handles 311 of the driving crank 31, the distance between the ends of the two long handles 311 gradually increases, that is, the end of the short handle 312 gradually rotates upward, the angle between the short handle 312 and the driven rod 32 gradually increases, and the driven rod 32 gradually lifts the working platform 4 upward; as the conical section 232 gradually withdraws downward from the long handles 311 of the driving crank 31, the distance between the ends of the two long handles 311 gradually decreases, that is, the end of the short handle 312 gradually moves downward, and under the action of the gravity of the working platform 4, the angle between the driven rod 32 and the short handle 312 gradually decreases, and the working platform 4 gradually descends, so that the lifting height of the working platform 4 is adjustable; the setting of the pulley 313 is conducive to the smooth extension and withdrawal of the push rod 23 between the ends of the two long handles 311, ensuring the stability and reliability of the push rod 23 driving the driving crank 31.

[0043] It can be understood that the push rod 23 described in the above embodiment includes a column segment 231 and a cone segment 232, which is only an implementation method and not a limitation to the structure of the push rod 23. For example, the push rod 23 can also be configured to include a column segment 231 and a quadrangular pyramid segment, etc. Those skilled in the art can reasonably set the structure of the push rod 23 according to actual conditions and needs, as long as the push rod 23 can rise and move the ends of the two long handles 311 away from each other.

[0044] See again Figure 1 Preferably, a universal wheel 12 with a brake is provided at the bottom of the base 1, a water storage chamber 13 is provided on the base 1, and the water pump 5 is respectively connected with the water storage chamber 13 and the piston chamber 21. In the case of no water source, water can be stored in the water storage chamber 13 for use when the working platform 4 is raised or lowered.

[0045] Preferably, a controller is provided on the working platform 4, and a signal receiver is provided on the water pump 5. As an example, different buttons are provided on the controller, and construction personnel standing on the working platform 4 send different control signals by pressing different buttons on the controller. After receiving the control signal, the signal receiver on the water pump 5 controls the water pump 5 to perform corresponding operations: forward pumping, reverse pumping or shutting down, thereby realizing intelligent control of the tunnel construction platform and ensuring the convenience and timeliness of controlling the lifting and lowering of the working platform 4.

[0046] Preferably, the working platform 4 is provided with a guardrail 43 along its circumference, and a protective cover 44 is provided on the top of the guardrail 43. During tunnel section construction, since the loose surrounding rock on the top of the tunnel may fall at any time, this poses a great safety hazard to the construction workers in the tunnel. By providing the protective cover 44, the construction workers can be prevented from being injured by falling rocks, thereby improving the safety of the tunnel construction platform.

[0047] Preferably, an arc-shaped bracket 431 is provided on the top of the guardrail 43, a guide rail 432 is provided on the arc-shaped bracket 431, and a slider 441 adapted to the guide rail 432 is provided on the protective cover 44. Since the construction workers need to construct the tunnel section, after the lifting is completed and stabilized, the protective cover 44 can be partially opened along the guide rail 432 on the arc-shaped bracket 431 to facilitate the construction workers' work.

[0048] In summary, the specific use process of the tunnel construction platform of this embodiment is as follows: push the tunnel construction platform to the construction position, step on the brake of the universal wheel 12 to fix the tunnel construction platform, and the construction personnel stand on the working platform 4 and control the water pump 5 to pump water into the piston chamber 21 through the controller. The piston plate 22 floats upward under the action of water, and the push rod 23 moves upward with the piston plate 22. The conical section 232 of the push rod 23 enters between the two ends of the long handles 311 along the pulley 313 at the end of the long handle 311. As the water in the piston chamber 21 increases, the conical section 232 extends deeper between the long handles 311, and the ends of the long handles 311 move farther away from each other around the pivot end. The end of the short handle 312 rotates upward around the pivot end, and the angle between the short handle 312 and the driven rod 32 connected to it gradually increases. The rod 32 gradually rises up against the working platform 4. After reaching a suitable height, the construction personnel control the water pump 5 to stop pumping water through the controller. When it is necessary to lower the working platform 4, the construction personnel control the water pump 5 to pump the water in the piston chamber 21 into the water storage chamber 13 through the controller. As the amount of water in the piston chamber 21 decreases, the piston plate 22 gradually descends, the push rod 23 descends with the piston plate 22, the conical section 232 gradually withdraws downward from between the long handles 311, the ends of the long handles 311 move around the pivot ends in the direction of approaching each other, the ends of the short handles 312 rotate downward around the pivot ends, and the angle between the short handle 312 and the driven rod 32 connected thereto gradually decreases. The driven rod 32 drives the working platform 4 to descend downward to reach the initial state, that is, when the working platform 4 is located at the upper end of the support plate 11, the water pump 5 is controlled to stop pumping water.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tunnel construction platform, characterized in that: It includes a base, a piston driving mechanism, a crank mechanism and a working platform. The upper end surface of the base is provided with a support plate, and the bottom of the working platform is provided with a connecting plate. The piston driving mechanism includes a piston chamber provided on the base and a piston plate provided in the piston chamber. The size of the piston plate is equal to the transverse cross-sectional size of the inner cavity of the piston chamber, and the piston plate and the piston chamber are provided with a sliding seal. A push rod is fixedly provided on the upper end surface of the piston plate, and the push rod passes through the top of the piston chamber. The bottom of the piston chamber is connected to a water pump. The crank mechanism includes a pair of symmetrically arranged driving cranks and a pair of driven rods, the driving crank is in a "7" shape, including a long handle and a short handle, the intersection of the long handle and the short handle is pivotally connected to the side wall of the support plate, the end of the short handle is pivotally connected to one end of the driven rod, and the ends of the two driven rods away from the short handle are inclined toward each other and are pivotally connected to the connecting plate. The water pump pumps water into the piston chamber, the water drives the piston plate and the push rod to float up, the push rod extends between the ends of the two long handles, so that the ends of the two long handles move away from each other around the pivot ends, and the short handle rotates upward around the pivot end to drive the driven rod to lift the working platform upward; The push rod comprises a column section and a conical section, wherein the column section passes through the top of the piston chamber and is connected to the conical section, and the top of the conical section is located at an end away from the column section; A pulley is provided at the end of the long handle, and when there is no water in the piston chamber, the top of the push rod abuts against the pulley; As the conical section gradually extends between the long handles of the driving crank, the distance between the ends of the two long handles gradually increases, that is, the end of the short handle gradually rotates upward, the angle between the short handle and the driven rod gradually increases, and the driven rod gradually lifts the working platform upward.

2. The tunnel construction platform according to claim 1, characterized in that: The support plates are arranged to form a quadrangular column structure, wherein the crank mechanisms are arranged on a pair of oppositely arranged support plates, the push rods are arranged at positions of the piston plate corresponding to the two crank mechanisms, and the connecting plates are arranged at positions of the bottom of the working platform corresponding to the two crank mechanisms. When there is no water in the piston chamber, the working platform is located on the upper end of the quadrangular column structure.

3. The tunnel construction platform according to claim 2, characterized in that: The two driven rods of the crank mechanism are pivotally connected to the center position of the connecting plate. An extension plate is arranged at the bottom of the working platform. The extension plate is arranged around the outside of the quadrangular prism structure. The dimension of the extension plate in the vertical direction is not less than the highest driving height of the crank mechanism. The connecting plate is arranged on the extension plate. The connecting plate is arranged on the extension plate, and the center point of the connecting plate and a median line of the working platform are located in the same plane.

4. The tunnel construction platform according to claim 1 or 3, characterized in that: A water storage chamber is arranged on the base, and the water pump is communicated with the water storage chamber and the piston chamber respectively.

5. The tunnel construction platform according to claim 1 or 3, characterized in that: The working platform is provided with a controller, and the water pump is provided with a signal receiver.

6. The tunnel construction platform according to claim 1 or 3, characterized in that: The working platform is provided with a guardrail along its circumference, and a protective cover is provided on the top of the guardrail.

7. The tunnel construction platform according to claim 6, characterized in that: An arc-shaped bracket is arranged on the top of the guardrail, a guide rail is provided on the arc-shaped bracket, and a sliding block adapted to the guide rail is arranged on the guard cover.

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