Pi-shaped movable operation platform for tunnel reconstruction and extension

Abstract

The invention belongs to the technical field of tunnel construction, and provides a pi-shaped movable working platform for tunnel reconstruction and extension, which comprises a working platform assembly, a steel support structure, a construction working face structure arranged at the top of the steel support structure, and a movable working face structure arranged at the top of the construction working face structure, a supporting mechanism is arranged at the front end of the steel support structure and used for supporting an existing tunnel lining, an automatic discharging mechanism is arranged between the front portion of the construction working face structure and the steel support structure and corresponds to a newly-built tunnel lining, and a moving mechanism is arranged at the bottom of the steel support structure. And the protection steel box culvert is arranged below the construction working face structure through the suspension assembly, and the protection steel box culvert is used for enabling vehicles to normally pass through the tunnel. According to the method, the obstruction to traffic can be reduced in the tunnel reconstruction and extension construction process, and meanwhile, the disturbance to the surrounding rock of the existing tunnel is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a π-shaped mobile working platform for tunnel reconstruction and expansion. Background Art

[0002] At present, with the increase of population and traffic demand in my country, the tunnels built in the last century and the early 21st century can no longer meet the traffic needs of people's daily travel. It is urgent to expand the original tunnels to eliminate the problem of traffic jams. The inventor found that most of the domestic expansion on the original tunnels is carried out under closed traffic conditions, which cannot allow vehicles to pass during construction, seriously affecting traffic. There are currently two expansion ideas, one is mechanical excavation and the other is blasting excavation. However, considering the poor construction conditions of early tunnels and the impact of many years of disturbance, the danger of blasting excavation will be much greater than mechanical excavation. Therefore, there is an urgent need for a π-type mobile work platform for tunnel expansion and reconstruction with little traffic obstruction and little surrounding rock disturbance. Summary of the invention

[0003] The purpose of the present invention is to provide a π-type mobile work platform for tunnel reconstruction and expansion to solve the above-mentioned problems, thereby reducing obstruction to traffic during tunnel reconstruction and expansion construction, and reducing disturbance to the surrounding rock of the existing tunnel.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: a π-shaped mobile working platform for tunnel reconstruction and expansion, comprising:

[0005] The working platform assembly comprises a steel support structure, a construction working surface structure is arranged on the top of the steel support structure, the front end of the construction working surface structure extends into the existing tunnel lining, a supporting mechanism is arranged at the front end of the steel support structure, the supporting mechanism is used to support the existing tunnel lining, an automatic unloading mechanism is arranged between the front part of the construction working surface structure and the steel support structure, the automatic unloading mechanism is arranged corresponding to the newly-built tunnel lining, and a moving mechanism is arranged at the bottom of the steel support structure;

[0006] A protective steel box culvert is arranged below the construction working surface structure through a suspension assembly, and the protective steel box culvert is used to allow vehicles to pass normally in the tunnel.

[0007] Preferably, the construction work surface structure includes a front-end work platform and a rear-end work platform, the rear end of the front-end work platform is hinged to the front end of the rear-end work platform, and the steel support structure is arranged at the bottom of the front-end work platform and the rear-end work platform;

[0008] The front-end working platform comprises a front part and a rear part of the front-end working platform, and the automatic unloading mechanism is arranged on the front part of the front-end working platform.

[0009] Preferably, the steel support structure at the bottom of the front working platform includes a plurality of vertical columns, and the plurality of vertical columns are fixedly connected to both sides of the bottom of the front working platform from front to back, a plurality of longitudinal rods are fixedly connected from top to bottom between the plurality of vertical columns located on the same side of the front working platform, a plurality of vertical rods are fixedly connected between the plurality of longitudinal rods and the front working platform, and diagonal rods are fixedly connected between the longitudinal rods, vertical rods and the vertical columns.

[0010] Preferably, the automatic unloading mechanism includes a conveyor belt arranged on the front part of the front working platform, the conveyor belt is arranged perpendicular to the front working platform, and a unloading platform is arranged on the vertical column. The top of the unloading platform is arranged corresponding to the conveyor belt, and the unloading platform is used to transport the slag transported on the conveyor belt to the truck.

[0011] Preferably, the supporting mechanism includes a sleeve hinged on a side wall of the vertical column, a support rod is slidably connected in the sleeve, a mechanical spring is abutted between the support rod and the sleeve, a supporting steel plate pad is fixedly connected to one end of the support rod away from the mechanical spring, the supporting steel plate pad is arranged corresponding to the existing tunnel lining, and an adjusting element is arranged on the support rod, and the adjusting element is used to adjust the extension amount of the support rod.

[0012] Preferably, expansion pieces are respectively provided on the two opposite side walls of the rear end working platform and the rear part of the front end working platform, and the expansion pieces located on the side walls of the rear end working platform include an expansion platform horizontally slidably connected to the rear end working platform, and the expansion platform horizontally slides through the side walls of the rear end working platform and the sliding direction is perpendicular to the rear end working platform, a side of the expansion platform close to the rear end working platform is fixedly connected to the rear end working platform with a number of mechanical push rods, and a side of the expansion platform away from the rear end working platform is fixedly connected to a guardrail.

[0013] Preferably, the moving mechanism comprises a hydraulic telescopic cylinder fixedly connected to the bottom of the vertical column, the bottom of the hydraulic telescopic cylinder is fixedly connected to a hydraulic guide rail walking mechanism, and the hydraulic guide rail walking mechanism is used to move the front working platform and the rear working platform forward and backward;

[0014] The hydraulic telescopic cylinder comprises a connecting steel block fixedly connected to the bottom of the vertical column, and the bottom of the connecting steel block is fixedly connected to the hydraulic guide rail walking mechanism through a telescopic rod and a hydraulic cylinder.

[0015] Preferably, the suspension assembly located at the bottom of the front working platform includes a plurality of hydraulic telescopic rods vertically fixedly connected to the bottom of the front working platform, a high-strength supporting steel plate is fixedly connected between the telescopic ends of the plurality of hydraulic telescopic rods, and the top of the protective steel box culvert is detachably connected to the high-strength supporting steel plate by a plurality of high-strength bolts.

[0016] Preferably, a mechanical folding platform is hingedly connected to one end of the rear-end working platform away from the front-end working platform, and the mechanical folding platform is used to move the engineering machinery onto the rear-end working platform.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: the main function of the steel support structure is to support the construction surface structure so that the protective steel box culvert can be placed under the construction surface structure; the main function of the protective steel box culvert is to allow vehicles to pass safely, reduce the impact of tunnel reconstruction and expansion on traffic, and can play a temporary support role in the protection process; the main function of the support mechanism is to support the existing tunnel lining and reduce the impact of mechanical excavation on the existing structure; the main function of the automatic unloading mechanism is to quickly transport the slag on the construction surface structure to the loading and unloading truck; the main function of the moving mechanism is to enable the working platform assembly to move flexibly in the longitudinal direction; the main function of the suspension assembly is to lift or lower the protective steel box. On the whole, when using the working platform of the present invention to carry out tunnel reconstruction and expansion construction, the impact on traffic and surrounding rock can be minimized. At the same time, the working platform of the present invention is flexible to move and has high slag discharge efficiency, which can effectively shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 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 work.

[0019] Figure 1 This is a front view of the working platform of the present invention;

[0020] Figure 2 It is a structural cross-sectional view of the working platform of the present invention;

[0021] Figure 3 It is a cross-sectional view of the front working plane of the working platform of the present invention;

[0022] Figure 4 It is a cross-sectional view of the rear end working plane of the working platform of the present invention;

[0023] Figure 5 A top view of the working platform of the present invention;

[0024] Figure 6 is a schematic diagram of a mechanical telescopic rod;

[0025] Figure 7 is a schematic diagram of a hydraulic telescopic cylinder;

[0026] Figure 8 It is a schematic diagram of the suspension assembly;

[0027] Among them, 1. front working platform; 2. rear working platform; 3. vertical column; 6. longitudinal rod; 7. vertical rod; 8. diagonal rod; 9. front part of front working platform; 10. rear part of front working platform; 11. expansion platform; 12. angle adjustment hydraulic cylinder; 15. protective steel box culvert; 16. hydraulic telescopic rod; 17. high-strength supporting steel plate; 18. high-strength bolt; 19. hydraulic guide rail walking mechanism; 20. protective railing; 21. high-strength hinge; 22. Mechanical push rod; 23. Mechanical telescopic rod; 23-1. Rotating rod; 23-2. Mechanical spring; 23-3. Adjusting element; 23-4. Supporting steel plate pad; 23-5. Sleeve; 23-6. Support rod; 24. Unloading platform; 25. Conveyor belt; 26. Hydraulic telescopic cylinder; 26-1. Connecting steel block; 26-2. Telescopic rod; 26-3. Hydraulic cylinder; 27. Mechanical folding platform; Ⅰ. Existing tunnel lining; Ⅱ. New tunnel lining. DETAILED DESCRIPTION

[0028] 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.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figure 1-Figure 8 The present invention provides a π-type mobile working platform for tunnel reconstruction and expansion, comprising:

[0031] The working platform assembly includes a steel support structure, a construction working surface structure is arranged on the top of the steel support structure, the front end of the construction working surface structure extends into the existing tunnel lining I, a supporting mechanism is arranged at the front end of the steel support structure, the supporting mechanism is used to support the existing tunnel lining I, an automatic unloading mechanism is arranged between the front part of the construction working surface structure and the steel support structure, the automatic unloading mechanism is arranged corresponding to the newly-built tunnel lining II, and a moving mechanism is arranged at the bottom of the steel support structure;

[0032] The protective steel box culvert 15 is arranged below the construction working surface structure through a suspension assembly. The protective steel box culvert 15 is used to allow vehicles to pass normally in the tunnel.

[0033] The main function of the steel support structure is to support the construction surface structure so that the protective steel box culvert 15 can be placed under the construction surface structure; the main function of the protective steel box culvert 15 is to allow vehicles to pass safely, reduce the impact of tunnel reconstruction and expansion on traffic, and can play a temporary support role in the protection process; the main function of the support mechanism is to support the existing tunnel lining and reduce the impact of mechanical excavation on the existing structure; the main function of the automatic unloading mechanism is to quickly transport the slag on the construction surface structure to the loading and unloading truck; the main function of the moving mechanism is to enable the working platform assembly to move flexibly in the longitudinal direction; the main function of the suspension assembly is to lift or lower the protective steel box culvert 15. On the whole, when using the working platform of the present invention to carry out tunnel reconstruction and expansion construction, the impact on traffic and surrounding rock can be minimized. At the same time, the working platform of the present invention is flexible to move and has high slag discharge efficiency, which can effectively shorten the construction period.

[0034] Further optimizing the scheme, the construction work surface structure includes a front-end work platform 1 and a rear-end work platform 2, the rear end of the front-end work platform 1 is hinged with the front end of the rear-end work platform 2, and a steel support structure is set at the bottom of the front-end work platform 1 and the rear-end work platform 2;

[0035] The front-end working platform 1 comprises a front-end working platform front part 9 and a rear-end working platform rear part 10 , and the automatic unloading mechanism is arranged on the front-end working platform front part 9 .

[0036] like Figure 1 and Figure 5 As shown, the front-end working platform 1 and the rear-end working platform 2 are connected by a high-strength hinge 21 to achieve hinge connection between the two to form an integral working surface. At the same time, it can also meet the rotation requirements under certain circumstances and improve the scope of application.

[0037] During the overall construction of the tunnel, the front part 9 of the front working platform extends into the existing tunnel lining I. The construction vehicle drives onto the front part 9 of the front working platform to conveniently excavate the existing tunnel lining I. The rear working platform 2 and the rear part 10 of the front working platform are in the newly built tunnel lining II. The construction vehicles and personnel can construct the newly built tunnel lining II on the above platforms.

[0038] To further optimize the solution, the front-end working platform 1 and the rear-end working platform 2 are both paved with steel plates.

[0039] A further optimization scheme is that the steel support structure at the bottom of the front working platform 1 includes a plurality of vertical columns 3, and the plurality of vertical columns 3 are fixedly connected to the two sides of the bottom of the front working platform 1 from front to back, and a plurality of longitudinal rods 6 are fixedly connected from top to bottom between the plurality of vertical columns 3 located on the same side of the front working platform 1, and a plurality of vertical rods 7 are fixedly connected between the plurality of longitudinal rods 6 and the front working platform 1, and diagonal rods 8 are fixedly connected between the longitudinal rods 6, the vertical rods 7 and the vertical columns 3.

[0040] like Figure 1 As shown, two groups of diagonal bars 8 are fixedly connected between the longitudinal bars 6, the vertical bars 7 and the vertical columns 3 to form a cross shape. By interconnecting a number of vertical columns 3, the longitudinal bars 6 and the vertical bars 7, a strong supporting structure is formed to meet the stiffness and strength requirements of the front working platform 1 and the rear working platform 2.

[0041] A further optimized solution is that the automatic unloading mechanism includes a conveyor belt 25 arranged on the front part 9 of the front working platform, the conveyor belt 25 is arranged vertically to the front working platform 1, and a unloading platform 24 is arranged on a vertical column 3. The top of the unloading platform 24 is arranged corresponding to the conveyor belt 25, and the unloading platform 24 is used to transport the slag transported on the conveyor belt 25 to the truck.

[0042] like Figure 2 and Figure 5 As shown, the ballast generated by the construction vehicles when excavating the tunnel falls directly onto the surface of the front part 9 of the front working platform. When the ballast needs to be cleaned out of the tunnel, the construction personnel can start the conveyor belt 25, and the construction vehicles will gradually push the ballast onto the conveyor belt 25. The conveyor belt 25 transports the ballast to one side and causes the ballast to fall onto the unloading platform 24. The loading and unloading truck is docked at the bottom of the unloading platform 24. By directly guiding the ballast into the loading and unloading truck, the ballast can be quickly cleaned up.

[0043] like Figure 2 As shown, a group of unloading platforms 24 are respectively arranged on the two vertical columns 3 on both sides of the front part 9 of the front working platform. By adjusting the forward and reverse rotation of the conveyor belt 25, different loading and unloading trucks can alternately load slag under the two unloading platforms 24, thereby further improving the cleaning efficiency.

[0044] To further optimize the solution, the top of the unloading platform 24 is hinged on the vertical column 3, and an angle-adjusting hydraulic cylinder 12 is hinged between the unloading platform 24 and the vertical column 3. The angle of the unloading platform 24 can be adjusted by extending and retracting the angle-adjusting hydraulic cylinder 12. The angle of the unloading platform 24 can be adjusted in time for tunnels of different sizes and scales to ensure that the ballast material enters the loading and unloading trucks smoothly.

[0045] A further optimized solution is provided, wherein the supporting mechanism comprises a sleeve 23-5 hinged on a side wall of a vertical column 3, a supporting rod 23-6 being slidably connected in the sleeve 23-5, a mechanical spring 23-2 being abutted between the supporting rod 23-6 and the sleeve 23-5, and a supporting steel plate pad 23-4 being fixedly connected to one end of the supporting rod 23-6 away from the mechanical spring 23-2, the supporting steel plate pad 23-4 being arranged corresponding to the existing tunnel lining I, and an adjusting element 23-3 being arranged on the supporting rod 23-6, and the adjusting element 23-3 being used for adjusting the extension amount of the supporting rod 23-6.

[0046] like Figure 2 , Figure 3 and Figure 6 As shown, the sleeve 23-5 and the vertical column 3 are hinged by the rotating rod 23-1. The adjusting element 23-3 can be a lever structure welded on the support rod 23-6. The construction personnel move the support rod 23-6 to the inner side of the sleeve 23-5 through the adjusting element 23-3, and then adjust the angle of the sleeve 23-5 so that after the force applied to the adjusting element 23-3 is removed, the support rod 23-6 can be extended under the elastic force of the mechanical spring 23-2 and pushed on the side wall of the existing tunnel lining I through the supporting steel plate pad 23-4, thereby reducing the disturbance to the surrounding rock. The elastic force of the mechanical spring 23-2 can also be used to assist the movement when moving the steel support structure.

[0047] To further optimize the solution, expansion parts are respectively provided on the two opposite side walls of the rear end working platform 2 and the rear part 10 of the front end working platform. The expansion parts located on the side walls of the rear end working platform 2 include an expansion platform 11 horizontally slidably connected to the rear end working platform 2. The expansion platform 11 horizontally slides through the side walls of the rear end working platform 2 and the sliding direction is perpendicular to the rear end working platform 2. A side of the expansion platform 11 close to the rear end working platform 2 is fixedly connected to the rear end working platform 2 with a number of mechanical push rods 22, and a side of the expansion platform 11 away from the rear end working platform 2 is fixedly connected with a guardrail 20.

[0048] like Figure 2 and Figure 4 As shown, by controlling the mechanical push rod 22, the expansion platform 11 can be pushed out from the side walls of the rear end working platform 2 and the rear part 10 of the front end working platform, thereby expanding the working area of ​​the rear end working platform 2 and the rear part 10 of the front end working platform to meet the working space requirements of different tunnel sections.

[0049] Further optimized solution, the moving mechanism includes a hydraulic telescopic cylinder 26 fixedly connected to the bottom of the vertical column 3, and the bottom of the hydraulic telescopic cylinder 26 is fixedly connected to a hydraulic guide rail walking mechanism 19, and the hydraulic guide rail walking mechanism 19 is used to move the front working platform 1 and the rear working platform 2 forward and backward;

[0050] The hydraulic telescopic cylinder 26 includes a connecting steel block 26 - 1 fixedly connected to the bottom of the vertical column 3 , and the bottom of the connecting steel block 26 - 1 is fixedly connected to the hydraulic guide rail walking mechanism 19 through a telescopic rod 26 - 2 and a hydraulic cylinder 26 - 3 .

[0051] like Figure 1 , Figure 2 and Figure 7 As shown, the hydraulic guide rail travel mechanism 19 is a conventional structure in the field, and its working principle and working process are not described in detail. The hydraulic guide rail travel mechanism 19 can realize the movement of the front working platform 1 and the rear working platform 2 along the longitudinal direction of the tunnel by driving the vertical column 3 to move along the guide rail.

[0052] By driving the telescopic rod 26 - 2 to extend or retract through the hydraulic cylinder 26 - 3 , the front working platform 1 and the rear working platform 2 can be vertically lifted and lowered, thereby meeting the working space requirements of different tunnel sections.

[0053] A further optimized solution is that the suspension assembly located at the bottom of the front working platform 1 includes a plurality of hydraulic telescopic rods 16 vertically fixedly connected to the bottom of the front working platform 1, and a high-strength supporting steel plate 17 is fixedly connected between the telescopic ends of the plurality of hydraulic telescopic rods 16. The top of the protective steel box culvert 15 is detachably connected to the high-strength supporting steel plate 17 by a plurality of high-strength bolts 18.

[0054] like Figure 1 and Figure 8 As shown, high-strength support steel plates 17 are respectively provided on the inner and outer sides of the top wall of the protective steel box culvert 15. The construction personnel fix the two high-strength support steel plates 17 to the top wall of the protective steel box culvert 15 through a number of high-strength bolts 18. The telescopic ends of a number of hydraulic telescopic rods 16 are fixedly connected to the high-strength support steel plates 17 located at the top of the protective steel box culvert 15. When it is necessary to move the front working platform 1 and the rear working platform 2, the protective steel box culvert 15 can be lifted off the ground by controlling the hydraulic telescopic rod 16 to retract, so that the position movement can be carried out smoothly. After the shift is completed, the protective steel box culvert 15 is placed back on the ground by extending the hydraulic telescopic rod 16. At the same time, the protective steel box culvert 15, the high-strength support steel plates 17 and the hydraulic telescopic rod 16 can play a certain supporting role for the front working platform 1 and the rear working platform 2.

[0055] According to a further optimization scheme, a mechanical folding platform 27 is hingedly connected to one end of the rear-end working platform 2 away from the front-end working platform 1 , and the mechanical folding platform 27 is used to move the construction machinery onto the rear-end working platform 2 .

[0056] The mechanical folding platform 27 is a conventional structure in the field, and its working principle and working process are not described in detail. Through the mechanical folding platform 27, it is convenient for a general excavator to travel to the rear working platform 2, so as to carry out renovation and expansion construction work on the front working platform 1 and the rear working platform 2.

[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A π-type mobile work platform for tunnel reconstruction and expansion, characterized in that ,include: The working platform assembly comprises a steel support structure, a construction working surface structure is arranged on the top of the steel support structure, the front end of the construction working surface structure extends into the existing tunnel lining (I), a supporting mechanism is arranged at the front end of the steel support structure, the supporting mechanism is used to support the existing tunnel lining (I), an automatic unloading mechanism is arranged between the front part of the construction working surface structure and the steel support structure, the automatic unloading mechanism is arranged corresponding to the newly-built tunnel lining (II), and a moving mechanism is arranged at the bottom of the steel support structure; A protective steel box culvert (15) is provided below the construction working surface structure through a suspension assembly, and the protective steel box culvert (15) is used to allow vehicles to pass normally in the tunnel.

2. A π-shaped mobile work platform for tunnel reconstruction and expansion according to claim 1, characterized in that: The construction work surface structure comprises a front-end work platform (1) and a rear-end work platform (2), the rear end of the front-end work platform (1) and the front end of the rear-end work platform (2) are hingedly connected, and the steel support structure is arranged at the bottom of the front-end work platform (1) and the rear-end work platform (2); The front-end working platform (1) comprises a front part (9) of the front-end working platform and a rear part (10) of the front-end working platform, and the automatic unloading mechanism is arranged on the front part (9) of the front-end working platform.

3. A π-shaped mobile work platform for tunnel reconstruction and expansion according to claim 2, characterized in that: The steel support structure at the bottom of the front working platform (1) comprises a plurality of vertical columns (3), which are fixedly connected to two sides of the bottom of the front working platform (1) from front to back, respectively; a plurality of longitudinal rods (6) are fixedly connected from top to bottom between the plurality of vertical columns (3) located on the same side of the front working platform (1); a plurality of vertical rods (7) are fixedly connected between the plurality of longitudinal rods (6) and the front working platform (1); and diagonal rods (8) are fixedly connected between the longitudinal rods (6), the vertical rods (7) and the vertical columns (3).

4. A π-shaped mobile work platform for tunnel reconstruction and expansion according to claim 3, characterized in that: The automatic unloading mechanism comprises a conveyor belt (25) arranged on the front part (9) of the front working platform, the conveyor belt (25) is arranged vertically with the front working platform (1), a unloading platform (24) is arranged on one of the vertical columns (3), the top end of the unloading platform (24) is arranged corresponding to the conveyor belt (25), and the unloading platform (24) is used to transport the slag transported on the conveyor belt (25) to a truck.

5. The π-shaped mobile working platform for tunnel reconstruction and expansion according to claim 3, characterized in that: The support mechanism comprises a sleeve (23-5) hinged on a side wall of the vertical column (3), a support rod (23-6) is slidably connected in the sleeve (23-5), a mechanical spring (23-2) is abutted between the support rod (23-6) and the sleeve (23-5), a support steel plate pad (23-4) is fixedly connected to one end of the support rod (23-6) away from the mechanical spring (23-2), the support steel plate pad (23-4) is arranged corresponding to the existing tunnel lining (I), and an adjustment element (23-3) is arranged on the support rod (23-6), and the adjustment element (23-3) is used to adjust the extension amount of the support rod (23-6).

6. The π-shaped mobile work platform for tunnel reconstruction and expansion according to claim 2, characterized in that: Extension pieces are respectively arranged on two opposite side walls of the rear end working platform (2) and the rear part (10) of the front end working platform. The extension piece located on the side wall of the rear end working platform (2) comprises an extension platform (11) horizontally slidably connected to the rear end working platform (2). The extension platform (11) horizontally slides through the side wall of the rear end working platform (2) and the sliding direction is perpendicular to the rear end working platform (2). A side of the extension platform (11) close to the rear end working platform (2) is fixedly connected to the rear end working platform (2) with a plurality of mechanical push rods (22). A side of the extension platform (11) away from the rear end working platform (2) is fixedly connected with a guardrail (20).

7. The π-shaped mobile work platform for tunnel reconstruction and expansion according to claim 3, characterized in that: The moving mechanism comprises a hydraulic telescopic cylinder (26) fixedly connected to the bottom of the vertical column (3), the bottom of the hydraulic telescopic cylinder (26) is fixedly connected to a hydraulic guide rail walking mechanism (19), and the hydraulic guide rail walking mechanism (19) is used to move the front working platform (1) and the rear working platform (2) forward and backward; The hydraulic telescopic cylinder (26) comprises a connecting steel block (26-1) fixedly connected to the bottom of the vertical column (3); the bottom of the connecting steel block (26-1) is fixedly connected to the hydraulic guide rail walking mechanism (19) via a telescopic rod (26-2) and a hydraulic cylinder (26-3).

8. The π-shaped mobile work platform for tunnel reconstruction and expansion according to claim 2, characterized in that: The suspension assembly located at the bottom of the front working platform (1) includes a plurality of hydraulic telescopic rods (16) vertically fixedly connected to the bottom of the front working platform (1), a high-strength support steel plate (17) is fixedly connected between the telescopic ends of the plurality of hydraulic telescopic rods (16), and the top of the protective steel box culvert (15) is detachably connected to the high-strength support steel plate (17) via a plurality of high-strength bolts (18).

9. The π-shaped mobile work platform for tunnel reconstruction and expansion according to claim 2, characterized in that: A mechanical folding platform (27) is hingedly connected to one end of the rear working platform (2) away from the front working platform (1), and the mechanical folding platform (27) is used to move the engineering machinery onto the rear working platform (2).

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