Self-propelled step ladder protection device, shield tunnel arc-shaped member synchronous installation system and installation method

Abstract

The present invention discloses a self-propelled ladder protection device, a synchronous installation system and method for arc-shaped parts of a shield tunnel, aiming to solve the technical problems that when prefabricated arc-shaped parts are synchronously installed during shield construction, workers have difficulty in going up and down, and the labor intensity is high due to repeated disassembly and assembly of temporary ladders and guardrails, which affects the construction period. The present application includes a rear-end trolley, a connecting bridge, a hoisting mechanism and a self-propelled ladder protection device. The connecting bridge is installed between the rear-end trolleys correspondingly arranged at the front and rear, and the hoisting mechanism is installed on the connecting bridge. The self-propelled ladder protection device includes slide rails correspondingly installed at the bottom of the connecting bridge on both sides along the shield tunneling direction, pulleys matched with the slide rails, and a driving motor connected to the pulley transmission. The present invention improves the work efficiency of the synchronous installation of arc-shaped parts and reduces the time and labor for repeated disassembly and assembly of ladders and guardrails.

Description

Technical Field

[0001] The present invention relates to the technical field of shield equipment, and in particular to a self-propelled step ladder protection device, a shield tunnel arc-shaped member synchronous installation system and an installation method. Background Art

[0002] In recent years, the construction of tunnels and underground projects has developed rapidly. Taking railway tunnels as an example, statistics show that in the past five years, the average annual mileage of newly added railway tunnels in operation has exceeded 1,400 km, equivalent to a growth rate of 4 km per day. As an important method for building tunnels, shield construction has the characteristics of high efficiency, speed, safety and reliability. Shield construction can achieve high automation of processes such as excavation, slag discharge, and lining assembly. With the development of shield construction technology, it is no longer limited to assembling tunnels into shape through pipe segments through assembly machines. Based on the continuous development of prefabricated construction concepts and technologies, the internal structure of tunnels has gradually shifted from cast-in-place to prefabricated.

[0003] The bottom arc parts of large-diameter shield tunnels are generally prefabricated and assembled synchronously with shield excavation. They have the following advantages: 1) High construction quality: The internal structure is prefabricated in a factory, which has significant advantages in resource management, production management, quality control, and green construction. Compared with cast-in-place operations, the working environment of personnel is good, the production and maintenance of the structure are standardized, and the structure quality is high; 2) Obvious advantages in construction period: The prefabricated construction of the internal structure is basically synchronized with the excavation construction. Compared with cast-in-place construction, it has little disturbance to other processes, greatly reduces the difficulty of construction organization and material transportation, and greatly improves the degree of civilized construction; 3) High degree of mechanical automation: Prefabricated construction, with corresponding automated construction equipment, greatly reduces the number of personnel, has a high degree of mechanization, and has high construction efficiency. After the arc parts are assembled, there is a height difference of nearly 3 meters between the top surface of the arc parts and the bottom of the inner arc surface of the pipe segment, and the arc parts need to be assembled synchronously with the shield excavation construction. Fixed steps cannot be constructed, and it is extremely inconvenient for construction personnel to go up and down.

[0004] Moreover, the inventors of the present application found that the above-mentioned technology has at least the following technical problems in the process of realizing the technical solutions in the embodiments of the present application: when designing a large-diameter shield, conventional existing technical means usually set a ladder extending to the bottom of the tunnel at the front of the connecting bridge or the rear of the No. 1 trolley, but from the arc-shaped member area to the bottom of the tunnel, it is necessary to detour to the front of the connecting bridge or the No. 1 trolley, and then turn around and detour for about 50m; during on-site construction, in order to facilitate the operation, a temporary ladder is generally hung on the side of the installed arc-shaped member. When the arc-shaped member needs to be installed, the temporary ladder is removed and restored after installation. The operation is extremely inconvenient and there are safety risks. In addition, there is a height difference of nearly 3 meters between the top working area of ​​the arc-shaped member and the bottom of the inner arc of the segment, so edge protection is extremely important. However, because the arc-shaped member needs to be continuously hoisted and assembled, edge protection is extremely difficult to implement. During on-site construction, temporary movable guardrails are generally used for protection. The guardrails are moved away when the curved parts are hoisted, and then restored after installation. Or fixed guardrails are used. When the curved parts are hoisted, the guardrails are removed, and then moved and fixed after installation. This requires a lot of work, is inconvenient to operate, and has a poor protective effect.

[0005] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a self-propelled ladder protection device, a shield tunnel arc member synchronous installation system and an installation method.

[0007] According to one aspect of the present disclosure, a self-propelled step ladder protection device is provided, comprising a slide rail, a driving mechanism, a connecting rod, a walking assembly and a guardrail; the driving mechanism comprises a housing, a pulley installed in the housing and cooperating with the slide rail, and a driving motor connected to the pulley in a transmission manner; the walking assembly comprises an arc-shaped step ladder and a transverse channel, the transverse channel being correspondingly installed on the top of the arc-shaped step ladder, one end of the guardrail being connected to the driving mechanism through the connecting rod, and the other end of the guardrail being fixed to the transverse channel, and connecting rods are also respectively provided on the arc-shaped step ladder and the transverse channel to be fixedly connected to the driving mechanism, so that the guardrail and the arc-shaped step ladder follow the pulley to make reciprocating movements along the slide rail.

[0008] In some embodiments of the present disclosure, the distance between the connection between the guardrail and the transverse passage and the top of the curved staircase is 2 to 2.1 m.

[0009] In some embodiments of the present disclosure, a fixing hole is provided on the top of the connecting rod, and a through hole matching the fixing hole is provided on the shell. Locking pieces are added in the fixing hole and the through hole so that the connecting rod can be correspondingly mounted on the shell of the driving mechanism.

[0010] In some embodiments of the present disclosure, limit blocks are provided at both ends of the slide rail.

[0011] In some embodiments of the present disclosure, the drive motor is a forward and reverse motor.

[0012] According to another aspect of the present disclosure, a shield tunnel arc-shaped member synchronous installation system is provided, comprising a rear-end supporting trolley, a connecting bridge, a hoisting mechanism and the above-mentioned self-propelled step ladder protection device; the connecting bridge is installed between the rear-end supporting trolleys correspondingly arranged at the front and rear, the hoisting mechanism is installed on the connecting bridge, and the slide rails are correspondingly installed at the bottom of the connecting bridge on both sides along the shield excavation direction.

[0013] In some embodiments of the present disclosure, a control unit is also included, which includes a controller, a signal receiver, an AC contactor, a relay and a circuit breaker. The signal receiver, AC contactor, relay and circuit breaker are electrically connected to the drive motor so that the signal receiver controls the start, stop and forward and reverse rotation of the drive motor based on the signal transmitted by the controller.

[0014] In some embodiments of the present disclosure, the arc-shaped step ladder has the same curvature as the segment in the tunnel, and the bottom of the arc-shaped step ladder is 5 to 10 cm away from the top surface of the segment in the tunnel.

[0015] According to another aspect of the present disclosure, a method for installing curved parts at the bottom of a large-diameter shield tunnel is provided, characterized in that it is implemented based on the above-mentioned arc-shaped parts synchronous installation system after shield tunneling, and includes the following steps:

[0016] S1, conventional working position, when there is no arc-shaped component assembly operation, the arc-shaped step ladder is close to the installed arc-shaped component, the edge protection of the guardrail is in place, and personnel go up and down through the arc-shaped step ladder;

[0017] S2, operating the controller to control the drive motor to drive the pulley to move on the slide rail, so that the curved step ladder and the guardrail move to the end of the slide rail away from the arc-shaped component assembly area, providing space for the arc-shaped component to be hoisted and rotated;

[0018] S3, the hoisting mechanism lifts the arc-shaped piece to be assembled and moves it to the assembly area, and after adjusting it to the installation posture, installs the arc-shaped piece to be assembled in place;

[0019] S4, operate the remote control to move the curved step ladder and the guardrail to the edge of the curved part to be installed, and perform edge protection in time. At the same time, the operator goes up and down the curved step ladder to perform assembly work;

[0020] S5, after the arc parts are assembled, when the shield machine is excavating, the arc steps and guardrails move forward with the shield machine. During the movement, the arc steps and guardrails are always close to the arc parts to ensure that workers can pass up and down and install protection on the edges.

[0021] One or more technical solutions provided in the embodiments of the present application have at least any of the following technical effects or advantages:

[0022] 1. The guardrail and the curved step ladder are designed as an integrated structure. The driving mechanism enables the curved step ladder and the guardrail to move back and forth along the tunnel excavation direction, providing support for the workers to pass up and down and for the safety protection of the edges. This effectively solves the problem of repeated removal of temporary steps and guardrails during the construction of the curved parts at the bottom of the existing shield tunnel, reduces manual labor and construction period, and greatly improves the installation efficiency of the curved parts.

[0023] 2. The controller controls the drive motor to drive the pulley to move on the slide rail, thereby adjusting the position of the curved step ladder and the guardrail, which does not interfere with the lifting and installation of the curved parts to be installed, and effectively solves the technical problem of moving back and forth between trolley No. 1 or the front of the connecting bridge and the curved part installation work area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a self-propelled ladder protection device in one embodiment of the present application.

[0025] Figure 2 Schematic diagram of the cross-sectional structure of a driving structure in one embodiment of the present application.

[0026] Figure 3 This is a schematic diagram of the structure of a synchronous installation system for arc-shaped components of a shield tunnel in another embodiment of the present application.

[0027] Figure 4 This is one of the reference diagrams of the usage status of the shield tunnel arc member synchronous installation system in another embodiment of the present application.

[0028] Figure 5 This is one of the reference diagrams of the usage status of the shield tunnel arc member synchronous installation system in another embodiment of the present application.

[0029] Figure 6 This is one of the reference diagrams of the usage status of the shield tunnel arc member synchronous installation system in another embodiment of the present application.

[0030] Figure 7 This is one of the reference diagrams of the usage status of the shield tunnel arc member synchronous installation system in another embodiment of the present application.

[0031] Figure 8 This is a schematic diagram of a control unit of a shield tunnel arc-shaped component synchronous installation system in another embodiment of the present application.

[0032] In the above figures, 1. slide rail; 11. limit block; 2. drive mechanism; 21. mounting shell; 22. pulley; 23. drive motor; 3. connecting rod; 4. guardrail; 5. walking assembly; 51. arc-shaped step ladder; 52. horizontal channel; 6. rear supporting trolley; 7. connecting bridge; 8. lifting mechanism; 9. arc-shaped part; 10. control unit; 101. contactor; 102. relay; 103. circuit breaker; 104. wireless signal receiver. DETAILED DESCRIPTION

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", etc. involved in the present application are used to distinguish the objects described and do not have any order or technical meaning. The terms "connection" and "connection" involved in the present application, unless otherwise specified, include direct and indirect connections (connections).

[0034] Unless otherwise specified, the unit modules (components, structures, mechanisms) or materials involved in the following embodiments are conventional commercially available products.

[0035] The embodiments of the present application provide a self-propelled step ladder protection device, a shield tunnel arc-shaped component synchronous installation system and an installation method, thereby solving the technical problems in the prior art of the difficulty of workers in going up and down when simultaneously installing prefabricated arc-shaped components during shield construction, the high labor intensity caused by repeated disassembly and assembly of temporary steps and guardrails, and the impact on the construction period.

[0036] The technical solution in the embodiment of the present application is to solve the above-mentioned problems of difficulty in up and down passage of workers and poor safety protection of edges when synchronously installing arc-shaped parts. The overall idea is as follows:

[0037] A plurality of slide rails are arranged at the bottom of the connecting bridge along the direction of tunnel excavation, and pulleys, a driving motor for driving the pulleys to move forward and backward along the slide rails, and a shell for installing and fixing the pulleys and the driving motor are installed on the slide rails; it also includes a guardrail arranged perpendicular to the tunnel excavation direction and an arc-shaped step ladder with the same curvature as the bottom pipe segment in the tunnel; the arc-shaped step ladder also includes a transverse channel installed on the top thereof, one end of the guardrail is fixedly connected to one side of the transverse channel so that the guardrail and the arc-shaped step ladder form an integral structure; the other end of the guardrail is fixedly connected to the shell slidably installed on the slide rail through a connecting rod, and the arc-shaped step ladder and the transverse channel are also fixedly connected to the corresponding shell on the slide rail through corresponding connecting rods, so that when the driving motor drives the pulley to move on the slide rail, the guardrail and the arc-shaped step ladder installed on the shell follow the shell to make reciprocating movements on the slide rail.

[0038] The bottom of the arc-shaped step ladder maintains a height difference of 5 to 10 cm from the top surface of the installed pipe segment in the tunnel to prevent the arc-shaped step ladder and the tunnel pipe segment from being damaged by friction during movement; and the fixed connection between the guardrail and the transverse channel is about 2 meters away from the arc-shaped step ladder, which is the distance of one ring of shield tunneling. During the forward excavation of the shield, the guardrail and the step ladder move forward synchronously with the connecting bridge between the rear matching trolleys. During the movement, the transverse channel and the guardrail are always on the installed arc-shaped parts to provide safety protection on the edge and facilitate workers to enter the arc-shaped step ladder through the transverse channel to achieve the purpose of up and down passage.

[0039] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Embodiment 1

[0041] This example discloses a self-propelled step ladder protection device, see Figure 1 to Figure 2 , including a slide rail 1, a driving mechanism 2, a connecting rod 3, a step ladder and a guardrail 4; the driving mechanism 2 includes a mounting shell 21, a pulley 22 and a driving motor 23, the pulley 22 is matched and connected with the slide rail 1 so that the pulley 22 slides along the slide rail 1, the driving motor 23 is connected with the pulley 22 in a transmission manner to provide a driving force for the pulley 22 to move along the slide rail 1, the mounting shell 21 is used to install and fix the pulley 22 and the driving motor 23, the driving motor 23 is fixed on one side of the mounting shell 21, and the pulley 22 is rotatably mounted on the inner side of the mounting shell 21 through a rotating shaft.

[0042] The walking assembly 5 includes a curved step ladder 51 and a transverse channel 52. The transverse channel 52 is fixedly connected to the top of the curved step ladder 51 along the tunnel excavation direction. The curved step ladder 51 has the same curvature as the pipe segment in the tunnel, and the curved step ladder 51 extends toward the center of the tunnel. The bottom of the curved step ladder maintains a height difference of 5 to 10 cm with the top surface of the pipe segment in the tunnel to prevent the curved step ladder 51 from scratching the pipe segment in the tunnel during movement.

[0043] The guardrail 4 is arranged along a vertical direction perpendicular to the tunneling direction. One end of the guardrail 4 is vertically fixed and welded to one side of the transverse channel 52, so that the guardrail 4, the transverse channel 52 and the arc-shaped step ladder 51 form an integral structure. The other end is fixedly connected to the driving mechanism 2 through a connecting rod 3 arranged along the vertical direction. The bottom of the connecting rod 3 arranged between the guardrail 4 and the corresponding driving mechanism 2 is fixedly connected to the guardrail 4 by welding, and a fixing hole is opened on the top, and a corresponding hole is also opened on the mounting shell on the driving mechanism 2 connected thereto. The two corresponding holes are connected by bolts and nuts so that the top of the connecting rod 3 is fixedly connected to the installation shell 21; corresponding connecting rods 3 are also provided between the guardrail 4 and the step ladder and the corresponding driving structure. At the same time, in order to consider the force stability and the load-bearing requirements of the operators passing up and down, two guide rails are provided on the installation side of the curved step ladder 51. The two rows of connecting rods 3 form a frame structure, which is more stable. The bottoms of the connecting rods 3 on the two outer slide rails 1 are fixed to the corners of the corner platform at the top of the curved step ladder 51, and the bottoms of the two connecting rods 3 on the inner slide rail 1 are welded The connecting rod 3 is fixed to the middle part of the arc-shaped step ladder 51 to ensure the stability of the arc-shaped step ladder 51; the top of the connecting rod 3 arranged between the arc-shaped step ladder 51 and the guardrail 4 and the corresponding driving structure is also provided with fixing holes, and the mounting housing 21 of the driving structure matched therewith is also provided with corresponding holes, and the connecting top is fixedly connected with the mounting housing 21 of the driving structure through the combination of bolts and nuts, so that when the driving motor 23 drives the pulley 22 to reciprocate on the slide rail 1, the guardrail 4 and the arc-shaped step ladder 51 follow the mounting housing 21 to move on the slide rail 1; The distance between the guardrail 4 and the fixed position of the transverse passage 52 and the arc-shaped step ladder 51 is 2m to 2.1m, that is, the distance of one ring of excavation; the purpose is: the distance of one ring of shield excavation is two meters, and the width of one arc-shaped member 9 is also two meters. When the shield is excavating, the self-propelled movable step ladder and guardrail device structure will also move with the shield machine, and the guardrail will also move with it, reserving a distance of 2m to 2.1. During shield excavation, the protective effect of the guardrail 4 will not fail, and the operator can also walk from the transverse passage 52 to the arc-shaped step ladder 51 and go down to the bottom of the tunnel to work.

[0044] Limiting blocks 11 are provided at both ends of the slide rail 1 to prevent the pulley 22 from falling during movement.

[0045] Embodiment 2

[0046] This example discloses a synchronous installation system for the supporting arc-shaped member 9 after shield tunneling. Figure 3 , including a rear supporting trolley 6, a connecting bridge 7, a hoisting mechanism 8 and the above-mentioned self-propelled step ladder protection device; the rear supporting trolley 6 includes trolley No. 1 and trolley No. 2, and a connecting bridge 7 is provided between trolley No. 1 and trolley No. 2, and the hoisting structure is installed on the connecting bridge 7, and the slide rail 1 of the self-propelled step ladder protection device is arranged along the bottom of the pedestrian passage on both sides of the connecting bridge 7, and several of the driving structures are correspondingly installed on the slide rail 1 matched therewith, and the walking assembly 5 and the guardrail 4 are correspondingly connected to the corresponding driving mechanism 2 through the connecting rod 3, so that under the action of the driving motor 23, the walking assembly 5 and the guardrail 4 move along the slide rail 1 or / and the self-propelled step ladder protection device moves forward synchronously with the connecting bridge 7 as the shield advances, and during the movement, the guardrail 4 always performs safety protection on the edge of the arc-shaped member 9, and at the same time, the operating personnel can also enter the arc-shaped step ladder 51 through the horizontal channel 52 to realize up and down construction passage.

[0047] The drive motor 23 is a 400W gear motor with a reduction ratio of 10:1, which can realize the forward, backward and stop actions of the self-propelled step ladder protection device. The drive motor 23 is connected to the control unit 10, see Figure 8 The control unit 10 is equipped with two NXC-32 contactors, four CHD-12VDV-SL-C relays, and three RMC1-63 circuit breakers to realize the start and stop and synchronous action control of the drive motor 23; the control unit 10 is equipped with a YJ-DX4-A wireless signal receiver to receive the action command signal transmitted by the remote control; the remote control is equipped with forward, backward, start, and stop buttons, and has a built-in anti-interference signal transmitter, which is consistent with the receiver frequency in the control unit 10 to realize accurate transmission of wireless signals; control mode: the remote control transmits the action command signal → the wireless signal receiver receives the command → the AC contactor 101 and the relay 102 act → the drive motor 23 is controlled to execute the action command.

[0048] Example 3

[0049] This example discloses a method for installing the arc-shaped member 9 at the bottom of a large-diameter shield tunnel. Figures 4 to 7 , based on the above shield tunneling supporting arc-shaped member 9 synchronous installation system, including the following steps:

[0050] Each time the shield machine excavates one ring (2m), it needs to assemble one arc-shaped piece 9 (2m) simultaneously. According to the process arrangement, the prefabricated blocks of the arc-shaped piece 9 are transported from outside the tunnel to the unloading position of the arc-shaped piece 9 lifting mechanism 8 by a double-headed locomotive, and then hoisted to the pre-installation position by the arc-shaped piece 9 lifting mechanism 8.

[0051] (1) Conventional working position

[0052] When there is no arc-shaped member 9 to be assembled, the arc-shaped step ladder 51 is close to the outermost installed arc-shaped member 9, and the edge protection of the guardrail 4 is in place, so that the workers can pass up and down conveniently. Figure 2 shown.

[0053] (2) Lifting of curved parts

[0054] When the arc-shaped member 9 is hoisted, the arc-shaped step ladder 51 and the guardrail 4 will interfere with the hoisting of the arc-shaped member 9. The remote controller is operated to control the drive motor 23 to drive the pulley 22 to move along the forward direction of the shield machine on the slide rail 1, and further drive the arc-shaped step ladder 51 and the guardrail 4 to move forward at least 12m as a whole, avoiding the hoisting and rotation area of ​​the arc-shaped member 9; the arc-shaped member 9 to be assembled is hoisted to the rotation position by the hoisting mechanism 8, rotated 90°, and placed in front of the assembled arc-shaped member 9 to be installed, such as Figure 3 shown.

[0055] (3) The arc parts are placed in place

[0056] After the arc-shaped member 9 to be installed is placed in place, the remote controller is operated to move the arc-shaped step ladder 51 and the guardrail 4 to the side of the arc-shaped member 9 to be installed, and the edge protection is carried out in time. At the same time, the operating personnel can go up and down to carry out the operation. Figure 4 shown.

[0057] (4) Arc parts assembly completed

[0058] The arc-shaped part 9 is assembled by an internal walking assembly machine. After adjusting the posture, it is connected to the assembled arc-shaped part 9 by bolts as a whole. When the shield machine is excavating, the arc-shaped step ladder 51 and the guardrail 4 will move forward with the shield machine. During the movement, the guardrail protection will not be lost or invalid, and it will not affect the passage of people up and down. If necessary or interference occurs, the mobile step ladder and guardrail can be adjusted at any time by remote control. Figure 5 shown.

[0059] Although some preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0060] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of this application and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for installing arc-shaped parts at the bottom of a large-diameter shield tunnel, characterized in that: It is implemented based on the synchronous installation system of arc-shaped parts of shield tunnels, and the synchronous installation system of arc-shaped parts of shield tunnels includes a rear supporting trolley, a connecting bridge, a hoisting mechanism, a self-propelled step ladder protection device and a control unit; the connecting bridge is installed between the rear supporting trolleys correspondingly arranged at the front and rear, and the hoisting mechanism is installed on the connecting bridge; the self-propelled step ladder protection device includes a driving mechanism, a walking assembly, a slide rail, a connecting rod and a guardrail; the driving mechanism includes a shell, a pulley installed in the shell and cooperating with the slide rail, and a driving motor connected to the pulley transmission; the walking assembly includes an arc-shaped step ladder and a cross channel, and the cross channel is correspondingly installed on the top of the arc-shaped step ladder; the slide The rails are correspondingly installed at the bottom of the connecting bridge on both sides along the shield tunneling direction; one end of the guardrail is connected to the driving mechanism through the connecting rod, and the other end is fixed to the transverse channel. Connecting rods are also provided on the arc-shaped step ladder and the transverse channel to be fixedly connected to the driving mechanism, so that the guardrail and the arc-shaped step ladder follow the pulley to reciprocate along the slide rail; the control unit includes a controller, a signal receiver, an AC contactor, a relay and a circuit breaker, and the signal receiver, the AC contactor, the relay and the circuit breaker are electrically connected to the driving motor, so that the signal receiver controls the start, stop, forward and reverse rotation of the driving motor based on the signal transmitted by the controller; The method comprises the following steps: S1, when there is no arc-shaped component assembly operation, the arc-shaped step ladder is close to the installed arc-shaped component, the edge protection of the guardrail is in place, and personnel go up and down through the arc-shaped step ladder; S2, operating the controller to control the drive motor to drive the pulley to move on the slide rail, so that the curved step ladder and the guardrail move to the end of the slide rail away from the arc-shaped component assembly area, providing space for the arc-shaped component to be hoisted and rotated; S3, the hoisting mechanism lifts the arc-shaped piece to be assembled and moves it to the assembly area, and after adjusting it to the installation posture, installs the arc-shaped piece to be assembled in place; S4, operate the controller to move the curved step ladder and the guardrail to the edge of the curved part to be installed, and perform edge protection in time, while the workers go up and down the curved step ladder to perform assembly work; S5, after the arc parts are assembled, when the shield machine is excavating, the arc steps and guardrails move forward with the shield machine. During the movement, the arc steps and guardrails are always close to the arc parts to ensure the up and down passage of workers and the safety protection of the edges.

2. The method for installing the arc-shaped member at the bottom of a large-diameter shield tunnel according to claim 1 is characterized in that: The distance between the connection between the guardrail and the transverse passage and the top of the curved step ladder is 2 to 2.1 m.

3. The method for installing the arc-shaped member at the bottom of a large-diameter shield tunnel according to claim 1 is characterized in that: The top of the connecting rod is provided with a fixing hole, the shell is provided with a through hole matching the fixing hole, and locking pieces are added in the fixing hole and the through hole to enable the connecting rod to be correspondingly mounted on the shell of the driving mechanism.

4. The method for installing the arc-shaped member at the bottom of a large-diameter shield tunnel according to claim 1, characterized in that: Limit blocks are arranged at both ends of the slide rail.

5. The method for installing the arc-shaped member at the bottom of a large-diameter shield tunnel according to claim 1, characterized in that: The arc-shaped step ladder has the same curvature as the pipe segment in the tunnel, and the bottom of the arc-shaped step ladder is 5 to 10 cm away from the top surface of the pipe segment in the tunnel.

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