Mobile working platform structure for tunnel in-situ extension and construction method thereof

Abstract

The invention belongs to the technical field of tunnel construction, and particularly relates to a movable working platform structure for tunnel in-situ extension and a construction method thereof.According to the movable working platform structure for tunnel in-situ extension and the construction method thereof, a movable working platform and a movable traveling crane protection device are adopted, the traffic capacity of an existing tunnel is reserved, and the tunnel in-situ extension efficiency is improved; meanwhile, the movable driving protection device plays a role in guaranteeing the driving safety, and the construction safety is improved; the top tunneling assembly and the lateral tunneling assembly are used for expanding and excavating a tunnel at the same time, so that the construction steps are simplified, and the construction period is shortened; the surrounding rock at the arch springing position of the expanded excavation tunnel is reserved, the surrounding rock and an unremoved supporting structure at the arch springing position of the existing tunnel are jointly used as a simple arch springing reinforcing measure, the stability of the expanded excavation tunnel is facilitated, and the construction safety is improved.

Description

Technical Field

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

[0002] In order to meet the demand of increasing traffic volume, it is imperative to build new expressways or expand and renovate existing highways. However, in an environment with increasingly tight land resources, expanding and renovating existing highways is one of the best options.

[0003] In the prior art, when expanding an existing highway tunnel, the transportation department usually closes the corresponding road section, interrupts traffic and carries out tunnel expansion construction, which affects traffic operation, increases the load of adjacent lines, and is not conducive to regional economic development. The common response measure is to build a new double-track project, but the new double-track project will bring a series of planning, survey, investment and construction problems, delay the construction period, and increase financial, material and human resources.

[0004] Therefore, there is an urgent need for a mobile working platform structure and a construction method for in-situ expansion of a tunnel. Summary of the invention

[0005] The purpose of the present invention is to provide a mobile working platform structure for in-situ expansion of a tunnel and a construction method thereof to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A mobile working platform structure for in-situ expansion of a tunnel, comprising:

[0008] Working platform, moving along the tunnel;

[0009] A mobile vehicle protection device is arranged below the working platform and moves along the tunnel, and a driving space is arranged below the mobile vehicle protection device;

[0010] A top excavation assembly, movably arranged at the top of the working platform and located in front of the working platform in the direction of travel, for expanding the top of the tunnel;

[0011] A lateral excavation assembly, movably arranged on two opposite sides of the working platform and located in front of the working platform in the direction of travel, for expanding and excavating the side wall of the tunnel;

[0012] A slag cleaning unit is arranged on two opposite sides of the working platform, and the slag cleaning unit moves along the tunnel to clean up the residues generated during the tunnel expansion process;

[0013] A dust removal unit, arranged on opposite sides of the working platform, for removing dust generated during tunnel excavation;

[0014] The reinforcement auxiliary unit is arranged on the top of the working platform and is used to assist the workers in supporting the inner wall of the expanded tunnel.

[0015] Preferably, the working platform comprises:

[0016] The main body of the mobile working platform is set horizontally;

[0017] A plurality of telescopic legs of the mobile working platform are fixedly connected to the bottom surface of the mobile working platform body, and the plurality of telescopic legs of the mobile working platform are respectively located on both sides of the mobile working platform body, and the telescopic legs of the mobile working platform are close to the side wall of the tunnel;

[0018] The anti-derailment wheel of the mobile working platform is arranged at the bottom end of the telescopic support foot of the mobile working platform;

[0019] Two parallel mobile working platform tracks are laid on the bottom wall of the tunnel along the length direction of the tunnel, and the mobile working platform anti-derailment wheels are rollingly connected to the mobile working platform tracks;

[0020] The mobile driving protection device is located below the main body of the mobile working platform and between the telescopic supporting feet of the mobile working platform on both sides.

[0021] Preferably, the top excavation assembly comprises:

[0022] A top excavation drill vertical moving device is slidably connected to the top surface of the mobile working platform body through a moving rail, and the top excavation drill vertical moving device moves along the travel direction of the mobile working platform body;

[0023] A top boring rig horizontal moving device, fixedly connected to the lifting end of the top boring rig vertical moving device;

[0024] The top boring drill is fixedly mounted on the top surface of the horizontal moving device of the top boring drill.

[0025] Preferably, the lateral excavation assembly comprises:

[0026] Two-side directional boring machine rotating devices are respectively fixedly installed on two sides of the mobile working platform body close to the tunnel side wall;

[0027] A telescopic device for a lateral boring rig, the power end of which is fixedly mounted on the movable end of the rotating device of the lateral boring rig;

[0028] The lateral boring machine is fixedly mounted on the movable end of the telescopic device of the lateral boring machine.

[0029] Preferably, the slag cleaning unit comprises:

[0030] Two self-propelled slag trucks are respectively arranged on two opposite sides of the mobile working platform body. The self-propelled slag trucks move along the length direction of the tunnel and are used to clean up the residues generated during the tunnel expansion process.

[0031] Preferably, the ash removal unit comprises:

[0032] Two dust removal vehicles are located at the front end of the moving direction of the mobile working platform body and at the opposite sides of the mobile working platform body, and are used to remove dust generated during the tunnel expansion process.

[0033] Preferably, the reinforcement auxiliary unit comprises:

[0034] A steel bar assembly platform, fixedly connected to the top of the mobile working platform body, the steel bar assembly platform is used to assemble the steel arch frame;

[0035] The anchor spraying construction platform is fixedly connected to the top of the mobile working platform body, and the anchor spraying construction platform is located at the tail end of the mobile working platform body in the moving direction.

[0036] Preferably, a plurality of mobile driving protection device anti-derail wheels are fixedly connected to the bottom end of the mobile driving protection device, and the plurality of mobile driving protection device anti-derail wheels are respectively located on two opposite sides of the mobile driving protection device, and the mobile driving protection device anti-derail wheels are rollingly connected to the mobile driving protection device track, and the mobile driving protection device track is laid on the bottom wall of the tunnel, and the mobile driving protection device track is laid along the length direction of the tunnel.

[0037] A construction method for in-situ expansion of a tunnel, based on the mobile working platform structure for in-situ expansion of the tunnel, comprises the following steps:

[0038] Block the traffic, move the working platform to the initial working surface in the tunnel, resume the traffic, and let the vehicles pass through the tunnel through the driving space under the mobile driving protection device;

[0039] The tunnel is expanded by means of the top excavation components and the lateral excavation components set on the working platform. During the expansion process, the surrounding rock at the arch foot of the expanded tunnel is retained. The surrounding rock at the arch foot of the expanded tunnel and the unremoved supporting structure at the arch foot of the existing tunnel are used together as a simple arch foot reinforcement measure to keep the working face stable. The dust generated during the expansion process is removed by the dust removal unit, and the residue generated during the expansion process is cleaned by the slag cleaning unit. After a cycle of advancement is completed, the working platform and the mobile driving protection device move in the excavation direction, and the workers support the inner wall of the expanded tunnel with the assistance of the reinforcement auxiliary unit. This is repeated many times until the tunnel expansion is completed, and the expanded tunnel is supported and poured.

[0040] Compared with the prior art, the present invention has the following advantages and technical effects:

[0041] The mobile working platform structure and construction method for in-situ expansion of a tunnel of the present invention adopt a movable working platform and a mobile driving protection device, thereby retaining the traffic capacity of the existing tunnel. At the same time, the mobile driving protection device plays a role in protecting driving safety, thereby improving the safety of construction. The tunnel is expanded and excavated by a top excavation component and a lateral excavation component, and these can be carried out simultaneously, thereby simplifying the construction sequence and reducing the construction period. The surrounding rock at the arch foot of the expanded tunnel is retained, and together with the unremoved supporting structure at the arch foot of the existing tunnel, it serves as a simple arch foot reinforcement measure, thereby facilitating the stability of the expanded tunnel and improving the construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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 are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0043] Figure 1 This is a front view of the working platform in the present invention;

[0044] Figure 2 A top view of the working platform of the present invention;

[0045] Figure 3 It is a schematic diagram of the cooperation between the anti-derailing wheel of the mobile working platform and the track of the mobile working platform in the present invention;

[0046] Figure 4 It is a structural schematic diagram of the telescopic legs of the mobile working platform in the present invention;

[0047] Figure 5 It is a schematic diagram of the structure of the top excavation assembly in the present invention;

[0048] Among them, 1. Expansion tunnel outline; 2. Existing tunnel outline; 3. Mobile work platform body; 4. Mobile work platform telescopic legs; 5. Mobile work platform anti-derailment wheels; 6. Mobile work platform tracks; 7. Mobile driving protection device; 8. Mobile driving protection device anti-derailment wheels; 9. Mobile driving protection device tracks; 10. Lateral boring machine; 11. Lateral boring machine rotation device; 12. Lateral boring machine telescopic device; 13. Top boring machine Drilling rig; 14. Horizontal moving device of top excavation drilling rig; 15. Vertical moving device of top excavation drilling rig; 16. Rib plate; 17. Self-propelled slag truck; 18. Dust removal truck; 19. Platform articulation; 20. Steel bar assembly platform; 21. Anchor spraying construction platform; 1a. Top excavation of rock mass; 1b. Excavation of rock mass on both sides; 4a. Telescopic support column of mobile working platform; 4b. Telescopic support hydraulic device of mobile working platform; 7a. Driving space; 15a. Moving rail. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] Reference Figures 1 to 5 The present invention discloses a mobile working platform structure for in-situ expansion of a tunnel, comprising:

[0052] Working platform, moving along the tunnel;

[0053] A mobile vehicle protection device 7 is arranged below the working platform and moves along the tunnel, and a vehicle space 7a is arranged below the mobile vehicle protection device 7;

[0054] The length of the mobile driving protection device 7 is 15-20m, and the mobile driving protection device 7 completely blocks the working platform to ensure that the vehicle passes safely under the driving space 7a;

[0055] The top excavation assembly is movably arranged at the top of the working platform and located in front of the working platform in the direction of travel, and is used to expand the top of the tunnel;

[0056] Lateral excavation components, movably arranged on opposite sides of the working platform and located in front of the working platform in the direction of travel, are used to expand the side walls of the tunnel;

[0057] The slag cleaning unit is arranged on two opposite sides of the working platform, and moves along the tunnel to clean the residues generated during the tunnel expansion process;

[0058] The dust removal unit is arranged on opposite sides of the working platform to remove dust generated during tunnel expansion;

[0059] The reinforcement auxiliary unit is installed at the top of the working platform to assist workers in supporting the inner wall of the expanded tunnel.

[0060] To further optimize the solution, the working platform includes:

[0061] The mobile working platform body 3 is arranged horizontally;

[0062] The mobile working platform body 3 is arranged in two sections, and is arranged along the length direction of the tunnel. The two sections of the mobile working platform body 3 are hingedly arranged by a platform hinge 19, which is used to realize the steering process of the working platform. The top excavation assembly and the lateral excavation assembly are both located in the front section of the moving direction of the mobile working platform body 3;

[0063] A plurality of mobile working platform telescopic legs 4 are all fixedly connected to the bottom surface of the mobile working platform body 3. The plurality of mobile working platform telescopic legs 4 are respectively located on both sides of the mobile working platform body 3. The mobile working platform telescopic legs 4 are close to the side wall of the tunnel.

[0064] A rib plate 16 is fixedly connected between the main body 3 of the mobile working platform and the telescopic end of the telescopic support leg 4 of the mobile working platform to strengthen the firmness of the connection between the main body 3 of the mobile working platform and the telescopic support leg 4 of the mobile working platform;

[0065] The mobile working platform telescopic support leg 4 includes a mobile working platform telescopic support leg hydraulic device 4b, the movable end of the mobile working platform telescopic support leg hydraulic device 4b is fixedly connected to the bottom surface of the mobile working platform body 3, one end of the rib plate 16 is fixedly connected to the movable end of the mobile working platform telescopic support leg hydraulic device 4b, and the other end is fixedly connected to the bottom surface of the mobile working platform body 3;

[0066] The power end of the mobile working platform telescopic support leg hydraulic device 4b is fixedly connected to the mobile working platform telescopic support leg column 4a, the mobile working platform telescopic support leg column 4a and the mobile working platform telescopic support leg hydraulic device 4b are both vertically arranged, and the mobile working platform anti-derailment wheel 5 is fixedly installed at the bottom end of the mobile working platform telescopic support leg column 4a;

[0067] The anti-derailment wheel 5 of the mobile working platform is arranged at the bottom end of the telescopic support leg 4 of the mobile working platform;

[0068] Two parallel mobile working platform tracks 6 are laid on the bottom wall of the tunnel along the length direction of the tunnel, and the mobile working platform anti-derailment wheels 5 are rollingly connected to the mobile working platform tracks 6;

[0069] The mobile driving protection device 7 is located below the mobile working platform body 3 and between the telescopic legs 4 of the mobile working platform on both sides.

[0070] To further optimize the solution, the top excavation components include:

[0071] The top excavation drill rig vertical moving device 15 is slidably connected to the top surface of the mobile working platform body 3 through a moving rail 15a, and the top excavation drill rig vertical moving device 15 moves along the travel direction of the mobile working platform body 3;

[0072] The top excavation drilling rig horizontal moving device 14 is fixedly connected to the lifting end of the top excavation drilling rig vertical moving device 15;

[0073] The top excavation drill 13 is fixedly mounted on the top surface of the top excavation drill horizontal moving device 14 .

[0074] To further optimize the solution, the lateral excavation components include:

[0075] The two-side boring machine rotating devices 11 are respectively fixedly installed on the two sides of the mobile working platform body 3 close to the tunnel side wall;

[0076] A lateral boring rig telescopic device 12, the power end of which is fixedly mounted on the movable end of the lateral boring rig rotating device 11;

[0077] The lateral excavation drilling rig 10 is fixedly mounted on the movable end of the lateral excavation drilling rig telescopic device 12 .

[0078] To further optimize the solution, the slag cleaning unit includes:

[0079] Two self-propelled slag trucks 17 are respectively arranged on two opposite sides of the mobile working platform body 3. The self-propelled slag trucks 17 move along the length direction of the tunnel to clean up the residues generated during the tunnel expansion process.

[0080] To further optimize the solution, the ash removal unit includes:

[0081] Two dust removal vehicles 18 are located at the front end of the moving direction of the mobile working platform body 3 and at two opposite sides of the mobile working platform body 3, and are used to remove dust generated during the tunnel expansion process.

[0082] To further optimize the solution, the reinforcement auxiliary units include:

[0083] A steel bar assembly platform 20 is fixedly connected to the top of the mobile working platform body 3, and the steel bar assembly platform 20 is used to assemble the steel arch frame;

[0084] The anchor spraying construction platform 21 is fixedly connected to the top of the mobile working platform body 3 , and the anchor spraying construction platform 21 is located at the tail end of the mobile working platform body 3 in the moving direction.

[0085] Further optimizing the scheme, a plurality of mobile driving protection device anti-derail wheels 8 are fixedly connected to the bottom end of the mobile driving protection device 7, and the plurality of mobile driving protection device anti-derail wheels 8 are respectively located on two opposite sides of the mobile driving protection device 7, and the mobile driving protection device anti-derail wheels 8 are rollingly connected to the mobile driving protection device track 9, and the mobile driving protection device track 9 is laid on the bottom wall of the tunnel, and the mobile driving protection device track 9 is laid along the length direction of the tunnel.

[0086] A construction method for in-situ expansion of a tunnel, based on a mobile working platform structure for in-situ expansion of the tunnel, comprises the following steps:

[0087] Block the traffic, move the working platform to the working surface in the tunnel, restore the traffic, and let the vehicle pass through the tunnel through the driving space 7a under the mobile driving protection device 7;

[0088] The tunnel is expanded by means of the top excavation assembly and the lateral excavation assembly arranged on the working platform. During the expansion process, the surrounding rock at the arch foot of the expanded tunnel is retained. The surrounding rock at the arch foot of the expanded tunnel and the unremoved supporting structure at the arch foot of the existing tunnel are used together as a simple arch foot reinforcement measure to keep the working face stable. The dust generated during the expansion process is removed by the dust removal unit, and the residue generated during the expansion process is cleaned by the slag cleaning unit. After one cycle of advance is completed, the working platform and the mobile driving protection device 7 move in the excavation direction, and the workers support the inner wall of the expanded tunnel with the assistance of the reinforcement auxiliary unit. This is repeated many times until the tunnel expansion is completed, and the expanded tunnel is supported and poured.

[0089] One specific example:

[0090] Preparation: Block the traffic, lay two mobile vehicle protection device tracks 9 and two mobile working platform tracks 6 on the bottom wall (traffic road) of the existing tunnel along the length direction of the existing tunnel, the two mobile working platform tracks 6 are located outside the two mobile vehicle protection device tracks 9, assemble the working platform outside the tunnel, dismantle the tunnel door and its supporting facilities of the existing tunnel, drive the working platform and the mobile vehicle protection device 7 into the initial working surface in the existing tunnel along the mobile working platform tracks 6 and the mobile vehicle protection device tracks 9 respectively, restore the traffic, and let the vehicles pass through the driving space 7a below the mobile vehicle protection device 7;

[0091] Excavation: remove the supporting structure of the existing tunnel waist and above, excavate the top excavation rock mass 1a of the existing tunnel contour line 2 through the top excavation assembly, and stop at the expansion tunnel contour line 1, then remove the supporting structure of the side walls on both sides of the existing tunnel, and excavate the excavation rock mass 1b on both sides of the existing tunnel contour line 2 through the lateral excavation assembly, and stop at the expansion tunnel contour line 1, wherein the top excavation drill 13 can be moved to the position where excavation is required under the action of the top excavation drill vertical moving device 15 and the top excavation drill horizontal moving device 14, and the lateral excavation drill 10 can be moved to the position where excavation is required under the action of the lateral excavation drill rotating device 11 and the lateral excavation drill telescopic device 12, and then the dust removal vehicle 18 drives to the construction section to start dust removal;

[0092] After one cycle of excavation is completed, the self-propelled slag discharger 17 drives through both sides of the working platform to the construction section to discharge slag. When the slag is discharged, the top excavation drill bit 13 and the lateral excavation drill bit 10 stop working. After the slag is discharged, the self-propelled slag discharger 17 drives away from the construction section, and the working platform and the mobile driving protection device 7 move forward to carry out the next section of excavation. At the same time, the workers construct the steel arch frame on the steel bar assembly platform 20, spray concrete on the anchor spraying construction platform 21 and construct anchor rods, and carry out initial support for the excavated part of the tunnel, retain the surrounding rock at the arch foot of the part of the excavated tunnel, and use it together with the unremoved support structure at the arch foot of the existing tunnel as a simple arch foot reinforcement measure to keep the working face stable, and repeat the excavation steps for many times until the tunnel excavation is completed;

[0093] Support pouring: After the expanded tunnel converges and stabilizes, the support structure of the remaining part of the existing tunnel is removed, the surrounding rock of the invert of the expanded part is excavated, and the invert steel arch frame and shotcrete are constructed so that the initial support of the expanded tunnel and the existing tunnel invert are closed into a ring. The secondary lining and invert filling of the expanded tunnel are poured, drainage blind pipes, waterproof boards and other drainage measures are implemented, and the secondary lining of the side walls, arch waist and arch crown of the expanded tunnel is poured to complete the expansion.

[0094] The parts (lateral excavation drill bit 10, lateral excavation drill bit rotating device 11, lateral excavation drill bit telescopic device 12, top excavation drill bit 13, top excavation drill bit horizontal moving device 14, top excavation drill bit vertical moving device 15, 15a, mobile rail, mobile working platform telescopic support foot hydraulic device 4b, mobile working platform anti-derailing wheel 5, mobile working platform track 6, mobile driving protection device anti-derailing wheel 8 and mobile driving protection device track 9) of specific structure not mentioned in the present invention are all selected by those skilled in the art according to their own needs, and no further details are given.

[0095] 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.

[0096] 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 mobile working platform structure for in-situ tunnel expansion, characterized in that: include: Working platform, moving along the tunnel; A mobile vehicle protection device (7) is arranged below the working platform and moves along the tunnel, and a vehicle space (7a) is arranged below the mobile vehicle protection device (7); A top excavation assembly, movably arranged at the top of the working platform and located in front of the working platform in the direction of travel, for expanding the top of the tunnel; A lateral excavation assembly, movably arranged on two opposite sides of the working platform and located in front of the working platform in the direction of travel, for expanding the side wall of the tunnel; A slag cleaning unit is arranged on two opposite sides of the working platform, and the slag cleaning unit moves along the tunnel to clean up the residues generated during the tunnel expansion process; A dust removal unit, arranged on opposite sides of the working platform, for removing dust generated during tunnel excavation; The reinforcement auxiliary unit is arranged on the top of the working platform and is used to assist the workers in supporting the inner wall of the expanded tunnel.

2. A mobile working platform structure for in-situ tunnel expansion according to claim 1, characterized in that: The working platform comprises: The mobile working platform body (3) is arranged horizontally; A plurality of mobile working platform telescopic legs (4) are all fixedly connected to the bottom surface of the mobile working platform body (3), the plurality of mobile working platform telescopic legs (4) are respectively located on both sides of the mobile working platform body (3), and the mobile working platform telescopic legs (4) are close to the side wall of the tunnel; A mobile work platform anti-derailment wheel (5) is arranged at the bottom end of the mobile work platform telescopic support foot (4); Two parallel mobile working platform tracks (6) are laid on the bottom wall of the tunnel along the length direction of the tunnel, and the mobile working platform anti-derailment wheels (5) are rollingly connected to the mobile working platform tracks (6); The mobile driving protection device (7) is located below the mobile working platform body (3) and between the telescopic legs (4) of the mobile working platform on both sides.

3. The mobile working platform structure for in-situ tunnel expansion according to claim 2, characterized in that: The top excavation assembly comprises: A top excavation drilling rig vertical moving device (15) is slidably connected to the top surface of the mobile working platform body (3) via a moving rail (15a), and the top excavation drilling rig vertical moving device (15) moves along the travel direction of the mobile working platform body (3); A top excavation drilling rig horizontal moving device (14) is fixedly connected to the lifting end of the top excavation drilling rig vertical moving device (15); The top excavation drill (13) is fixedly mounted on the top surface of the top excavation drill horizontal moving device (14).

4. The mobile working platform structure for in-situ tunnel expansion according to claim 2, characterized in that: The lateral excavation assembly comprises: Two-sided excavation drilling rig rotating devices (11) are respectively fixedly mounted on two sides of the mobile working platform body (3) close to the tunnel side wall; A lateral boring machine telescopic device (12), the power end of which is fixedly mounted on the movable end of the lateral boring machine rotating device (11); A lateral excavation drilling rig (10) is fixedly mounted on the movable end of the lateral excavation drilling rig telescopic device (12).

5. The mobile working platform structure for in-situ tunnel expansion according to claim 2, characterized in that: The slag cleaning unit comprises: Two self-propelled slag discharge vehicles (17) are respectively arranged on two opposite sides of the mobile working platform body (3). The self-propelled slag discharge vehicles (17) move along the length direction of the tunnel and are used to clean up the residues generated during the tunnel expansion process.

6. The mobile working platform structure for in-situ tunnel expansion according to claim 2, characterized in that: The ash removal unit comprises: Two dust removal vehicles (18) are located at the front end of the moving direction of the mobile working platform body (3) and at two opposite sides of the mobile working platform body (3) and are used to remove dust generated during the tunnel expansion process.

7. The mobile working platform structure for in-situ tunnel expansion according to claim 2, characterized in that: The reinforcement auxiliary unit comprises: A steel bar assembly platform (20) is fixedly connected to the top of the mobile working platform body (3), and the steel bar assembly platform (20) is used to assemble a steel arch frame; The anchor spraying construction platform (21) is fixedly connected to the top of the mobile working platform body (3), and the anchor spraying construction platform (21) is located at the tail end of the mobile working platform body (3) in the moving direction.

8. The mobile working platform structure for in-situ tunnel expansion according to claim 1, characterized in that: A plurality of mobile vehicle protection device anti-derailing wheels (8) are fixedly connected to the bottom end of the mobile vehicle protection device (7); the plurality of mobile vehicle protection device anti-derailing wheels (8) are respectively located on two opposite sides of the mobile vehicle protection device (7); the mobile vehicle protection device anti-derailing wheels (8) are rollingly connected to a mobile vehicle protection device track (9); the mobile vehicle protection device track (9) is laid on the bottom wall of the tunnel; and the mobile vehicle protection device track (9) is laid along the length direction of the tunnel.

9. A construction method for in-situ expansion of a tunnel, based on the mobile working platform structure for in-situ expansion of a tunnel according to any one of claims 1 to 8, characterized in that: Here are the steps: Block the traffic, move the working platform to the initial working surface in the tunnel, restore the traffic, and allow vehicles to pass through the tunnel through the driving space (7a) below the mobile driving protection device (7); The tunnel is expanded by means of the top excavation assembly and the lateral excavation assembly arranged on the working platform. During the expansion process, the surrounding rock at the arch foot of the expanded tunnel is retained. The surrounding rock at the arch foot of the expanded tunnel and the supporting structure at the arch foot of the existing tunnel that has not been removed are used together as a simple arch foot reinforcement measure to maintain the stability of the working surface. The dust generated during the expansion process is removed by the dust removal unit, and the residue generated during the expansion process is cleaned by the slag cleaning unit. After a cycle of advance is completed, the working platform and the mobile driving protection device (7) move in the excavation direction. The workers support the inner wall of the expanded tunnel with the assistance of the reinforcement auxiliary unit. This is repeated many times until the tunnel expansion is completed, and the expanded tunnel is supported and poured.

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