A shield tunnel prefabricated box culvert piece fine adjustment assembling device

Abstract

The application provides a shield tunnel prefabricated box culvert piece fine adjustment assembling device, solves the problem of time-consuming and laborious when the prefabricated box culvert piece is butted, and guarantees the assembling quality of the prefabricated box culvert piece, which comprises a vehicle body, a stepping device, an extension device and a fine adjustment assembly, the vehicle body is a long structure extending from front to back and can move forward and backward in the culvert of the prefabricated box culvert piece; the fine adjustment assembly is installed at the front end of the vehicle body, the fine adjustment assembly comprises a box culvert piece supporting plate, the box culvert piece supporting plate is used for lifting the top of the culvert of the prefabricated box culvert piece and fine adjusting the position of the prefabricated box culvert piece; the stepping device is installed on the vehicle body and can move back and forth along the front and back directions, the stepping device comprises two symmetrical stepping supporting shoes, and the two stepping supporting shoes are used for fixing and supporting the left and right sidewalls of the culvert of the prefabricated box culvert piece; one end of the extension device is connected to the front end of the vehicle body, and the other end is connected to the stepping device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunnel prefabricated box culvert piece splicing, in particular to a shield tunnel prefabricated box culvert piece fine adjustment and assembly device. BACKGROUND

[0002] In the process of large-diameter shield tunnel construction, it is usually necessary to lay a box culvert at the bottom of the tunnel as a drainage channel or an emergency escape channel for personnel. The construction steps of the box culvert are relatively complicated. The traditional construction scheme adopts the erection of ordinary formwork for cast-in-place concrete construction, and the construction speed is slow. In order to improve the construction efficiency, the use of prefabricated components (segments, box culverts and middle partitions) for synchronous construction has become the mainstream.

[0003] The prefabricated box culvert piece is provided with a culvert in the middle, a plane at the top and an arc surface at the bottom. The prefabricated box culvert piece assembly method generally adopts the box culvert piece hoist disclosed in the application No. 202010218871.6, which is suitable for bottom arch rear assembly. The invention comprises a rear matching trailer, a transition trailer connected to the rear of the rear matching trailer, a box culvert piece hoist on the transition trailer, and a sliding trolley connected to the lower part of the transition trailer. The tunnel boring machine can realize the rear assembly of the bottom arch while ensuring the normal passage of the trackless rubber-tyred vehicle. However, the box culvert piece hoist is difficult to quickly and accurately adjust the box culvert piece splicing position, and the construction personnel need to adjust the prefabricated box culvert piece one by one to achieve accurate adjustment and assembly, resulting in a large amount of time and labor spent in the box culvert piece butt joint. SUMMARY

[0004] The present application aims to solve the above technical problems to some extent, and provides a shield tunnel prefabricated box culvert piece fine adjustment and assembly device, which solves the problem of time-consuming and labor-intensive in the butt joint of the prefabricated box culvert piece and ensures the assembly quality of the prefabricated box culvert piece.

[0005] The technical solution adopted by the present application to solve its technical problems is:

[0006] A shield tunnel prefabricated box culvert piece fine adjustment and assembly device, comprising a vehicle body, a stepping device, an extension device and a fine adjustment assembly, the vehicle body is a long-shaped structure extending from front to back and can move forward and backward in the culvert of the prefabricated box culvert piece;

[0007] The fine adjustment assembly is installed at the front end of the vehicle body, and the fine adjustment assembly comprises a box culvert piece supporting plate, which is used to lift the top of the culvert of the prefabricated box culvert piece and fine adjust the position of the prefabricated box culvert piece;

[0008] The stepping device is installed on the vehicle body and can move back and forth along the front and back directions, and the stepping device comprises two symmetrical stepping support shoes, which are used to fix and support the left and right sidewalls of the culvert of the prefabricated box culvert piece;

[0009] One end of the telescopic device is connected to the front end of the vehicle body, and the other end is connected to the stepping device.

[0010] Furthermore, the fine adjustment assembly further includes an H-shaped base frame, a fine adjustment concave guide platform, a fine adjustment longitudinal platform, and a fine adjustment transverse platform. The fine adjustment concave guide platform is fixed on the cross beam of the H-shaped base frame. The fine adjustment longitudinal platform is slidably connected to the fine adjustment concave guide platform in the front-back longitudinal direction. The fine adjustment transverse platform is slidably connected to the fine adjustment longitudinal platform in the left-right transverse direction.

[0011] The center position on the top surface of the fine adjustment transverse platform is ball-jointed with the culvert piece support plate. Fine adjustment inclination cylinders, fine adjustment elevation cylinders, and fine adjustment rotation cylinders are respectively ball-jointed on different sides between the fine adjustment transverse platform and the culvert piece support plate to adjust the left-right inclination, front-back elevation, and horizontal plane rotation angle of the culvert piece support plate.

[0012] Furthermore, the stepping device further includes a U-shaped stepping frame and two stepping support shoe cylinders. The U-shaped stepping frame is a U-shaped profile frame. Two stepping support shoes are respectively inserted into the left and right outer sides of the U-shaped stepping frame through slide bars. One end of each stepping support shoe cylinder is hinged on the U-shaped stepping frame, and the other end is hinged on the stepping support shoe. The stepping support shoe cylinder controls the corresponding stepping support shoe to move left and right horizontally.

[0013] A guide rail is provided on the vehicle body along the front-back direction. The middle part of the U-shaped stepping frame slides back and forth through a slider配合 on the guide rail.

[0014] Furthermore, the H-shaped base frame is composed of two vertical columns on the left and right and a cross beam in the middle. The lower ends of the columns of the H-shaped base frame are provided with support shoe columns that can slide up and down. The lower end of the support shoe column is hinged with a support shoe.

[0015] A fine adjustment vertical cylinder is hinged on the outer side of the column of the H-shaped base frame, and the other end of the fine adjustment vertical cylinder is hinged on the support shoe column.

[0016] Furthermore, ox horn connection blocks are symmetrically provided on the left and right sides at the front end of the vehicle frame. Vertical cylindrical guide pins are respectively provided on the left and right sides of the H-shaped base frame. The ox horn connection blocks are correspondingly slidably connected to the cylindrical guide pins.

[0017] Furthermore, the vehicle body includes a vehicle frame and multiple guide wheels. The vehicle frame is formed by splicing multiple cross beams and longitudinal beams. Two slide shoes that are symmetrically distributed left and right in parallel are installed below the vehicle frame through two rows of support legs. The guide wheels are installed on the outer sides of the two rows of support legs through cantilever beams.

[0018] Furthermore, multiple culvert piece vertical positioning pins are fixed on the culvert piece support plate, and multiple culvert piece horizontal positioning pins are fixed on the outer side surface of the stepping support shoe.

[0019] The beneficial effects achieved by this invention compared with the prior art are as follows:

[0020] 1. The stepping device is fixed in the culvert of the prefabricated box culvert component through two stepping support shoes. The fine adjustment assembly is located in the culvert of the prefabricated box culvert component to be assembled. The fine adjustment assembly realizes the lifting and six-degree-of-freedom precise adjustment of the prefabricated box culvert component to be assembled. The stepping device cooperates with the vehicle body to realize the movement of the entire prefabricated box culvert fine adjustment assembly device in the culvert of each prefabricated box culvert component.

[0021] This invention reliably ensures the precise adjustment of the position and orientation of precast box culvert components. It is simple to operate, effectively reduces the manpower input for splicing precast box culvert components, improves the splicing efficiency of precast box culvert components, and ensures the splicing quality of precast box culvert components.

[0022] 2. The fine-tuning assembly consists of support shoes, support shoe columns, fine-tuning vertical cylinders, H-shaped base frame, fine-tuning tilt cylinders, box culvert support plates, fine-tuning elevation cylinders, fine-tuning rotation cylinders, fine-tuning lateral cylinders, fine-tuning lateral platform, fine-tuning longitudinal cylinders, fine-tuning concave guide table, and fine-tuning longitudinal platform. Through the cooperation of each cylinder, the precast box culvert to be spliced ​​is lifted and precisely adjusted in six degrees of freedom, and the adjustment process is stable.

[0023] 3. The stepping device includes a geometric stepping frame, two stepping support shoe cylinders and two stepping support shoes. The two stepping support shoes can fix the stepping device in the culvert of the precast box culvert that has been spliced, which facilitates the fine adjustment assembly to work in the precast box culvert to be spliced. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the prefabricated box culvert component fine-tuning and assembly device for shield tunnels according to the present invention;

[0025] Figure 2 This is a schematic diagram of the fine-tuning assembly structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the vehicle body structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the stepping device structure of the present invention;

[0028] Figure 5 This is a simplified structural diagram of the prefabricated box culvert component of the present invention;

[0029] The components include: 1. Cylindrical guide pin; 2. Fine-tuning assembly; 201. Support shoe; 202. Support shoe column; 203. Fine-tuning vertical cylinder; 204. H-type base frame; 2041. Horn-shaped connecting block mounting seat; 205. Fine-tuning tilt cylinder; 206. Box culvert support plate; 2061. Box culvert vertical positioning pin; 207. Fine-tuning elevation cylinder; 208. Fine-tuning corner cylinder; 209. Fine-tuning lateral cylinder; 210. Fine-tuning lateral platform; 211. Fine-tuning longitudinal cylinder; 212. 213 Fine-tuning concave guide platform, 3 Fine-tuning longitudinal platform, 4 Bull-shaped body, 401 Bull-shaped frame, 4011 Bull horn connecting block, 4012 Stepping cylinder mounting base A, 4013 Four legs and two sliding shoes, 402 Guide wheel, 5 Stepping device, 501 π-shaped stepping support shoe, 5011 Box culvert transverse positioning pin, 502 Stepping support shoe cylinder, 503 D-shaped stepping frame, 5031 Slider, 5032 Stepping cylinder mounting base B. Detailed Implementation

[0030] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0031] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0032] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0033] like Figure 1 As shown in the figure, this embodiment discloses a fine-tuning assembly device for prefabricated box culvert components in a shield tunnel, which mainly consists of a fine-tuning assembly 2, a telescopic device, a vehicle body 4, and a stepping device 5. In this embodiment, the telescopic device is a stepping cylinder 3.

[0034] like Figure 2 As shown, the fine-tuning assembly 2 consists of a support shoe 201, a support shoe column 202, a fine-tuning vertical cylinder 203, an H-shaped base frame 204, a fine-tuning tilt cylinder 205, a box culvert support plate 206, a fine-tuning elevation cylinder 207, a fine-tuning rotation cylinder 208, a fine-tuning lateral cylinder 209, a fine-tuning lateral platform 210, a fine-tuning longitudinal cylinder 211, a fine-tuning concave guide table 212, and a fine-tuning longitudinal platform 213. The H-shaped base frame 204 is assembled from two vertical columns on the left and right sides and a crossbeam in the middle. There are two support shoes 201, two support shoe columns 202, and two fine-tuning vertical cylinders 203. The support shoe 201 is ball-hinged to the lower end of the support shoe column 202. The hinged support shoe is used to match and fit the support shoe surface with the surface of the culvert segments. The support shoe column 202 is slidably connected to the lower end of the H-shaped base frame 204 column. The fine-tuning vertical cylinders 203 are respectively hinged to the outer walls of the support shoe column 202 and the H-shaped base frame 204 column. Through the fine-tuning vertical cylinders 203, the fine-tuning assembly 2 can be raised as a whole and supported on the bottom surface of the culvert by the support shoes 201. Horn-shaped connecting block mounting seats 2041 are fixed to the outer sides of the two columns of the H-shaped base frame 204. Vertical cylindrical guide pins 1 are installed on the horn-shaped connecting block mounting seats 2041.

[0035] A fine-tuning concave guide platform 212 is fixed on the crossbeam of the H-shaped base frame 204. The surface of the fine-tuning concave guide platform 212 is machined with grooves. The upper part of the grooves of the fine-tuning concave guide platform 212 is slidably connected to the fine-tuning longitudinal platform 213 in the front-to-back longitudinal direction. Fine-tuning longitudinal cylinders 211 are distributed longitudinally in the front-to-back direction and are hinged to both the fine-tuning longitudinal platform 213 and the fine-tuning concave guide platform 212. The extension and retraction of the fine-tuning longitudinal cylinders 211 controls the front-to-back longitudinal sliding of the fine-tuning longitudinal platform 213 relative to the fine-tuning concave guide platform 212. The upper part of the fine-tuning longitudinal platform 213 is slidably connected to the fine-tuning transverse platform 210 in the left-to-right lateral direction. Fine-tuning transverse cylinders 209 are distributed laterally in the left-to-right lateral direction and are hinged to both the fine-tuning transverse platform 210 and the fine-tuning longitudinal platform 213. The extension and retraction of the fine-tuning transverse cylinders 209 controls the left-to-right lateral sliding of the fine-tuning transverse platform 210 relative to the fine-tuning longitudinal platform 213. The center position of the top surface of the fine-tuning transverse platform 210 is spherically hinged to the box culvert support plate 206. The fine-tuning tilt cylinder 205, the fine-tuning elevation cylinder 207, and the fine-tuning rotation cylinder 208 are spherically hinged to the fine-tuning transverse platform 210 and the box culvert support plate 206, respectively, thereby adjusting the left and right tilt angles, front and rear elevation angles, and horizontal rotation angle of the box culvert support plate. Among them, the tilt adjustment cylinder 205 is vertically distributed, with one end of the tilt adjustment cylinder 205 ball-jointed to the right side of the horizontal adjustment platform 210 and the other end ball-jointed to the right side of the box culvert support plate 206; the elevation adjustment cylinder 207 is vertically distributed, with one end of the elevation adjustment cylinder 207 ball-jointed to the front side of the horizontal adjustment platform 210 and the other end ball-jointed to the front side of the box culvert support plate 206; the rotation adjustment cylinder 208 is horizontally distributed front and rear, with one end ball-jointed to the left side of the top surface of the horizontal adjustment platform 210 and the other end ball-jointed to the left side of the bottom surface of the box culvert support plate 206. The tilt adjustment cylinder 205, elevation adjustment cylinder 207, and rotation adjustment cylinder 208 work together to achieve three-degree-of-freedom rotation adjustment of the box culvert's left and right tilt angles, front and rear elevation angles, and horizontal rotation angle. Two vertical positioning pins 2061, symmetrically distributed on the top surface of the box culvert support plate 206, are fixed to the box culvert. The vertical positioning pins 2061 are used for quick positioning of the box culvert when it is lifted.

[0036] like Figure 3As shown, in this embodiment, the vehicle body 4 is an elongated structure extending forward and backward and can move back and forth within the culvert of the precast box culvert. The vehicle body 4 includes a frame 401 and four guide wheels 402. The frame 401 is composed of three crossbeams and two longitudinal beams. Two parallel and symmetrically distributed sliding shoes 4013 are installed on the underside of the frame 401 via two rows of support legs. The sliding shoes 4013 are sliding plate structures extending forward and backward, facilitating sliding within the culvert. Guide wheels 402 are installed on the outer sides of the two rows of support legs of the frame 401 via cantilever beams. The guide wheels 402 are used to prevent the entire device from tilting to the side when the fine-tuning assembly device is stepping. Horn-shaped connecting blocks 4011 are symmetrically fixed on the left and right sides of the front crossbeam of the frame 401, and a stepping cylinder mounting seat A4012 is fixed in the middle of the crossbeam. The fine-tuning assembly 2 is slidably connected to the horn-shaped connecting block 4011 of the vehicle body 4 via the cylindrical guide pin 1. The sliding connection is used to prevent the vehicle body from being suspended in the air during the process of the fine-tuning assembly 2 lifting the box duct component.

[0037] like Figure 4 As shown, the stepping device 5 includes a U-shaped stepping frame 503, two stepping support shoes 501, and two stepping support shoe cylinders 502. The U-shaped stepping frame 503 is a profile frame in the shape of a "U" formed by splicing profile horizontal bars, profile vertical bars, and profile longitudinal bars. The two stepping support shoes 501 are respectively inserted into the left and right outer sides of the U-shaped stepping frame 503 via sliding rods. One end of each stepping support shoe cylinder 502 is hinged to the U-shaped stepping frame 503, and the other end is hinged to the stepping support shoe 501. The stepping support shoe cylinder controls the left and right lateral movement of the corresponding stepping support shoe. A box duct component lateral positioning pin 5011 is fixed at the center of the support plate of the stepping support shoe 501. The box duct component lateral positioning pin 5011 is used for quick positioning of the stepping device 5 and the box duct component and to prevent the stepping device 5 from sliding backward during the stepping process.

[0038] A guide rail is provided on the vehicle body 4 along the front-to-back direction. The middle part of the geometric stepper frame 503 slides back and forth on the guide rail of the vehicle body 4 through the cooperation of the slider 5031. A stepper cylinder mounting seat B5032 is fixed on the crossbeam of the geometric stepper frame 503. The two ends of the stepper cylinder 3 are respectively hinged to the stepper cylinder mounting seat A4012 at the front of the vehicle body 4 and the stepper cylinder mounting seat B5032 at the rear of the stepper device 5.

[0039] like Figure 5 As shown, taking the laying of box culverts at the bottom of a shield tunnel as a drainage channel or an emergency escape route for personnel as an example, during the processing of prefabricated box culvert components, in order to cooperate with the use of this invention, two support plate positioning pin holes are processed on the top of the culvert, and a stepping support plate positioning pin hole is processed on the left and right side walls of the culvert. Several prefabricated box culvert components are placed sequentially from back to front in the shield tunnel by a box culvert component crane. However, the box culvert component crane is difficult to quickly and accurately adjust the splicing position of the box culvert components. Construction personnel need to use the shield tunnel prefabricated box culvert component fine adjustment and assembly device described in this invention to adjust the prefabricated box culvert components to achieve precise adjustment and assembly.

[0040] For ease of description, the prefabricated box culvert components are numbered sequentially from back to front as component 0, component 1, component 2, etc. The specific working process of the prefabricated box culvert component fine-tuning and assembly device for shield tunnels described in this invention is as follows:

[0041] 1. The construction workers manually adjust the No. 0 component to the standard precise assembly position, and use the No. 0 component as the standard position;

[0042] 2. Move the precast box culvert component fine adjustment and assembly device of the shield tunnel into the culvert of component 0. The stepping device 5 is in the culvert of component 0. The stepping support shoe 501 unfolds and contacts the side wall of the culvert under the action of the stepping support shoe cylinder, so that the lateral positioning pin of the box culvert component is inserted into the positioning pin hole of the stepping support plate of the culvert, thereby fixing the stepping device 5 in the culvert of component 0. The stepping cylinder 3 extends, so that the vehicle body drives the fine adjustment assembly 2 to move forward to the appropriate position in the culvert of component 1.

[0043] 3. The fine-tuning assembly 2 is located inside the culvert of component 1. By moving the support shoe 201 and support shoe column 202 in the vertical direction, the vertical positioning pin of the box culvert component support plate is inserted into the positioning pin hole of the support plate of component 1 in the culvert of component 1, thereby realizing the lifting of component 1 and fine-tuning in the vertical direction. The longitudinal fine-tuning platform 213 moves longitudinally to realize the front-to-back longitudinal fine-tuning of component 1. The transverse fine-tuning platform 210 moves transversely to realize the left-to-right transverse fine-tuning of component 1. The ball joint of the transverse fine-tuning platform 210 and the box culvert component support plate 206 realizes the corner fine-tuning of component 1. The tilting cylinder 205, the elevation cylinder 207 and the rotation cylinder 208 work together to realize the three-degree-of-freedom corner fine-tuning of the box culvert component's left-to-right tilting angle, front-to-back elevation angle and horizontal rotation angle. The fine-tuning assembly 2 realizes the precise adjustment of the prefabricated box culvert component in six degrees of freedom in space, so that component 1 and component 0 are precisely connected.

[0044] 4. Fine-tune the vertical cylinder retraction to disengage the box culvert support plate from part 1. The stepping cylinder 3 extends further, causing the vehicle body to move the fine-tuning assembly 2 forward to the appropriate position inside the culvert of part 2. The fine-tuning assembly 2 repeats the action of step 3 to ensure that part 2 and part 1 are precisely aligned.

[0045] 5. The stepping support shoe cylinder of the stepping device 5 retracts, causing the stepping support shoe 501 to retract. Under the action of the stepping cylinder 3, the stepping device 5 is moved forward into the culvert of part 1, causing the stepping support shoe 501 to unfold, so that the lateral positioning pin of the box culvert is inserted into the positioning pin hole of the stepping support plate of part 1, thereby fixing the stepping device 5 in part 1.

[0046] The vertical hydraulic cylinder is retracted to disengage the box culvert support plate from part 2. The stepping hydraulic cylinder 3 extends further, causing the vehicle body to move the fine adjustment assembly 2 forward to the appropriate position inside the culvert of part 3. The fine adjustment assembly 2 repeats the action of step 3 to make part 3 and part 2 precisely dock.

[0047] 6. Repeat steps 3-5 above to fine-tune and connect each precast box culvert component.

[0048] This invention achieves the lifting and precise adjustment of precast box culvert components through a fine-tuning assembly. The stepping device, in conjunction with the bull-shaped vehicle body, enables the movement of the precast box culvert component fine-tuning assembly device within the box culvert component. This invention reliably ensures the precise adjustment of the precast box culvert component's position and posture, is simple to operate, effectively reduces the manpower input for precast box culvert component splicing, improves the efficiency of precast box culvert component splicing, and ensures the quality of precast box culvert component splicing.

[0049] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A fine-tuning and assembly device for prefabricated box culvert components in a shield tunnel, characterized in that, It includes a vehicle body, a stepping device, a telescopic device and a fine adjustment assembly. The vehicle body is a long-shaped structure extending front and back and can move back and forth in the culvert of a precast box culvert piece. The fine adjustment assembly is installed at the front end of the vehicle body. The fine adjustment assembly includes a box culvert piece support plate, which is used to support the top of the culvert of the precast box culvert piece and finely adjust the position of the precast box culvert piece. The stepping device is cooperatively installed on the vehicle body and can move back and forth along the front and back direction. The stepping device includes two symmetrically distributed stepping support shoes on the left and right, and the two stepping support shoes are used to fixedly support the left and right side walls of the culvert of the precast box culvert piece. One end of the telescopic device is connected to the front end of the vehicle body, and the other end is connected to the stepping device. The stepping device further includes a U-shaped stepping frame and two stepping support shoe cylinders. The U-shaped stepping frame is a U-shaped profile frame. The two stepping support shoes are respectively inserted on the left and right outer sides of the U-shaped stepping frame through sliding rods. One end of each stepping support shoe cylinder is hinged to the U-shaped stepping frame, and the other end is hinged to the stepping support shoe. The stepping support shoe cylinder controls the corresponding stepping support shoe to move horizontally left and right. A guide rail is provided on the vehicle body along the front and back direction. The middle part of the U-shaped stepping frame slides back and forth through a slider cooperating with the guide rail. A plurality of box culvert piece vertical positioning pins are fixed on the box culvert piece support plate, and a plurality of box culvert piece horizontal positioning pins are fixed on the outer side surface of the stepping support shoe. The box culvert piece horizontal positioning pins are used for rapid positioning of the stepping device and the box culvert piece and preventing the stepping device from slipping backward during the stepping process.

2. The fine-tuning and assembly device for prefabricated box culvert components in shield tunnels according to claim 1, characterized in that, The fine adjustment assembly further includes an H-shaped base frame, a fine adjustment concave guide platform, a fine adjustment longitudinal platform and a fine adjustment transverse platform. The fine adjustment concave guide platform is fixed on the cross beam of the H-shaped base frame. The fine adjustment longitudinal platform is slidably connected to the fine adjustment concave guide platform longitudinally front and back. The fine adjustment transverse platform is slidably connected to the fine adjustment longitudinal platform horizontally left and right. The top surface center position of the fine adjustment transverse platform is ball-jointed with the box culvert piece support plate. Fine adjustment inclination cylinders, fine adjustment elevation cylinders and fine adjustment rotation cylinders are respectively ball-jointed on different sides between the fine adjustment transverse platform and the box culvert piece support plate to adjust the left and right inclination angles, front and back elevation angles and horizontal plane rotation angles of the box culvert piece support plate.

3. The fine-tuning and assembly device for prefabricated box culvert components in shield tunnels according to claim 2, characterized in that, The H-shaped base frame is composed of two vertical columns on the left and right and a cross beam in the middle. The lower ends of the columns of the H-shaped base frame are provided with support shoe columns that can slide up and down, and the lower ends of the support shoe columns are hinged with support shoes. Fine adjustment vertical cylinders are hinged on the outer sides of the columns of the H-shaped base frame, and the other ends of the fine adjustment vertical cylinders are hinged to the support shoe columns.

4. The fine-tuning and assembly device for prefabricated box culvert components in shield tunnels according to claim 3, characterized in that, The vehicle body includes a vehicle frame and a plurality of guide wheels. The vehicle frame is spliced by a plurality of cross beams and longitudinal beams. Two left and right parallel and symmetrically distributed sliding shoes are installed below the vehicle frame through two rows of support legs, and the guide wheels are installed on the outer sides of the two rows of support legs through cantilever beams.

5. The fine-tuning and assembly device for prefabricated box culvert components in shield tunnels according to claim 4, characterized in that, Buffalo horn connection blocks are symmetrically provided on the left and right sides at the front end of the vehicle frame. Vertical cylindrical guide pins are respectively provided on the left and right sides of the H-shaped base frame, and the buffalo horn connection blocks are correspondingly slidably connected to the cylindrical guide pins.

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