Self-locking type sectional box girder inner mold based on end-walk driving

Abstract

The application discloses a self-locking type segmented box girder inner mold based on an inner walking type drive and belongs to the technical field of bridge prefabrication construction equipment, comprising a center support assembly, a mold shell assembly and a moving drive assembly. The center support assembly is composed of a long barrel with a built-in long straight track; the mold shell is divided into several segments, each segment containing four templates and four sealing strips; the templates are connected with the beam body in the long barrel through first sliding columns, and the sealing strips are driven by threaded rotating columns with driven tooth columns. The sliding seat travels along the track, uses the chamfer structure to gradually separate the templates, and drives the rotating columns by the built-in drilling machine to make the sealing strips top into the gap to realize locking. The application realizes the single power source by the walking sliding seat, and avoids the complex pipeline maintenance problem of the traditional hydraulic system. Meanwhile, the segmented structure realizes the gradual unlocking and sequential contraction of the mold, reduces the concrete cohesion and total traction force to be overcome during demolding, protects the surface of the initial setting concrete and the integrity of the beam body, and effectively prolongs the mechanical life of the equipment.

Description

Technical Field

[0001] This invention belongs to the technical field of bridge prefabrication construction equipment, specifically relating to a self-locking segmented box girder inner mold based on an internal wandering drive. Background Technology

[0002] In modern bridge construction, precast box girders have become core components for highway and railway bridge construction due to their advantages such as light weight, high torsional stiffness, and fast construction speed. The inner mold of the box girder, as a key technological piece of equipment for forming the hollow internal structure of the box girder, directly determines the forming quality, wall thickness accuracy, and production cycle of the box girder's inner cavity. Traditional inner mold devices typically consist of a formwork system, a support system, and a demolding mechanism. To resist enormous lateral pressure and ensure sealing during concrete pouring, the inner mold must possess extremely high structural strength and a stable locking mechanism. With the advancement of smart beam yard construction, the erection and dismantling of inner molds are gradually transitioning towards automation and mechanization.

[0003] Traditional automated internal molds often employ multiple hydraulic systems or complex mechanical linkages to achieve the opening action. This point-to-point drive method results in a dense network of internal pipelines and a large number of power components, increasing manufacturing difficulty and cost. Furthermore, the narrow, damp interior of the mold makes pipeline aging and damage extremely difficult to maintain. Existing integrated long internal molds must overcome the enormous cohesive force generated by the concrete along its entire length during demolding. The resulting total frictional resistance is extremely high, requiring ultra-heavy-tonnage traction equipment and easily damaging the inner surface of the concrete in its initial setting stage during the pulling process, even causing localized cracking. Due to the excessive demolding traction force, the long cylinder, track, and connecting components are under constant overload tension, leading to severe mechanical fatigue and shortening the mold's service life. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a self-locking segmented box girder inner mold based on internal wandering drive, which solves the technical problems of the existing inner mold causing maintenance difficulties due to power system redundancy, and the excessive resistance of integrated demolding which easily damages the concrete surface.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention includes a central support assembly, a mold housing assembly, and a moving drive assembly. The central support assembly includes a long cylinder and a long straight track fixedly disposed inside the long cylinder. The mold housing assembly is divided into several mold segments along the length of the long cylinder. Each mold segment includes four template structures that enclose an inverted trapezoidal cylindrical structure, and four sealing strips disposed at the adjacent gaps of the four template structures. A first sliding column and a beam are connected to the inner side of each template structure. The first sliding column slides through the cylinder wall of the long cylinder, and the beam is located inside the long cylinder. A rotating column is rotatably connected to the inner side of each sealing strip. The middle section of the rotating column has an external thread and is threadedly connected to the long cylinder. The inner end of the rotating column has a driven toothed column. The moving drive assembly includes a slide block slidably disposed on the long straight track and a traction mechanism for moving the slide block. The front end of the slide block has a chamfered structure for opening the four template structures. The interior of the slide block contains four drilling rigs, and the output end of each drilling rig has an active toothed column that cooperates with the driven toothed column.

[0006] Optionally, each template structure has two first sliding columns spaced apart along its length on its inner side. After the two first sliding columns are inserted into the long cylinder, their inner ends are fixed together with the beam. When the drilling rig drives the rotating column to rotate to push the seal into the gap, the supporting surface of the sliding block always remains in contact with the inner side of the beam for support.

[0007] Optionally, the drilling rig is mounted in the slide block by a resilient support assembly configured to allow the drilling rig to float in a direction perpendicular to the axis of the rotary column.

[0008] Optionally, the driven toothed column or the driving toothed column is a long gear structure, and its axial length is greater than the radial displacement of the rotating column during the thread unscrewing process, so as to ensure that the gear meshing is maintained throughout the entire process of the seal being pushed outward.

[0009] Optionally, a number of second sliding pillars are fixedly connected to the inner side of the seal. The second sliding pillars are slidably disposed on the side wall of the long cylinder. The slide seat has a cylindrical structure and four clearance grooves are provided on its side for the beam, the second sliding pillars and the rotating pillar to pass through. The tooth surface of the active toothed pillar protrudes from the side wall of the clearance groove.

[0010] Optionally, the side of the long straight track is provided with semi-circular positioning holes spaced apart along the length direction, and the inner wall of the slide is provided with elastic ball pins that cooperate with the semi-circular positioning holes. The position of the semi-circular positioning holes corresponds to the gear meshing position of each mold.

[0011] Optionally, the cross-sectional structure of the seal is a wedge-shaped limiting structure that is wider on the inside and narrower on the outside. Specifically, the wedge-shaped limiting structure is stepped or convex. The gap shape of the four template structures after they are opened is adapted to the cross-sectional shape of the seal.

[0012] Optionally, the end faces of two adjacent mold segments are connected by a sealing overlap structure, wherein the sealing overlap structure is constructed as a stepped mating surface or a beveled mating surface.

[0013] Optionally, the cross-section of the long straight track is a square tube structure with slots on both the upper and lower sides; the center of the slide has a square hole for the long straight track to pass through, and the upper and lower inner walls of the square hole are respectively arranged with support wheels that are supported in the slots of the long straight track.

[0014] Optionally, the traction mechanism includes a winding machine fixed to one end of the long drum, and a traction rope connected between the winding machine and the slide; both ends of the long drum are provided with fixed connecting seats for connecting to an external gantry frame.

[0015] The beneficial effects of this invention are as follows: by setting a long straight track inside the long cylinder and cooperating with a traveling slide, a single power source is achieved. Compared with the cumbersome traditional method of configuring a separate hydraulic system or manually opening the mold inside the inner mold, this solution only requires one set of moving drive components to complete the segmented expansion and locking of the entire mold. This not only reduces the number of power components but also fundamentally avoids the maintenance difficulties caused by complex pipelines. When demolding an integrated long formwork, it must overcome the cohesive force of the concrete along its entire length, resulting in huge frictional resistance that easily damages the surface of the initially set concrete. The segmented structure enables segmented unlocking and sequential contraction. This step-by-step physical separation reduces the total traction force during extraction, protects the integrity of the beam structure, and extends the mechanical life of the long cylinder and track.

[0016] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0017] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 A schematic diagram of the overall formwork of the box girder in this embodiment of the invention; Figure 2 A schematic diagram of the mold segment of this invention embodiment; Figure 3 A front view of a mold segment according to an embodiment of the invention; Figure 4 for Figure 3 AA section view; The following labels are used in the attached diagram: 710, long cylinder; 720, long straight track; 721, semi-circular positioning hole; 730, fixed connecting seat; 811, template structure; 812, sealing strip; 813, first sliding column; 814, beam; 815, rotating column; 816, driven toothed column; 817, second sliding column; 910, sliding block; 911, chamfered structure; 912, clearance groove; 913, square hole; 920, drilling rig; 921, active toothed column; 922, elastic support assembly; 930, support wheel; 940, elastic ball head pin; 951, winding machine; 952, traction rope. Detailed Implementation

[0018] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0019] Please see Figures 1-4 As shown in the accompanying drawings. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0020] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0021] like Figures 1-4 This invention discloses a self-locking segmented box girder inner mold based on an internal wandering drive. The device mainly consists of a central support component, a mold shell component, and a moving drive component.

[0022] Specifically, such as Figure 1As shown, the central support assembly serves as the static reference and load-bearing support for the entire device. The central support assembly includes a long cylinder 710 extending longitudinally along the box girder. The long cylinder 710, acting as the main load-bearing beam, is a high-strength cylindrical component. The length of the long cylinder 710 extends beyond the end molds at both ends of the box girder, and fixed connecting seats 730 are axially welded to both ends. The fixed connecting seats 730 are used for suspension and transportation by external gantry cranes or precast platforms. Figure 4 As shown, a long straight track 720 is fixedly installed in the internal cavity of the long cylinder 710. The long straight track 720 is made of square steel tubing, and guide grooves are respectively formed on its top and bottom surfaces. Both ends of the long straight track 720 are fixed to the inner ends of the long cylinder 710 by a fixing structure. The mold shell assembly is divided into several independent mold segments along the axial length of the long cylinder 710, and the axial length of each segment is set to 2-3 meters according to the standard section length of the box girder. Figure 3 and Figure 4 As shown, each mold segment has an inverted trapezoidal cylindrical structure in radial cross-section, enclosed by four template structures 811. The four template structures 811 are symmetrically distributed in space, with their fracture gaps located at the top, bottom, left, and right geometric midpoints of the inverted trapezoidal cross-section. Reinforcing ribs are welded to the back of each template structure 811 to resist localized stress during concrete vibration. A sealing strip 812 is correspondingly positioned at each of the four midpoint fracture gaps. The sealing strip 812 has a cross-sectional structure that is wider at one end and narrower at the other, forming a wedge-shaped, convex, or isosceles trapezoidal wedge. To achieve longitudinal continuity between template segments, a sealing overlap structure is provided between the axial end faces of two adjacent mold segments. The sealing overlap structure is constructed as a stepped mating surface or a beveled mating surface. Specifically, the end of the panel of the previous section is provided with an inwardly recessed overlapping groove, and the front end of the panel of the next section is provided with an outwardly extending overlapping tongue. When the two are axially connected, they form an overlapping area. An elastic sealing strip 812 can also be installed to prevent grout leakage during the pouring process.

[0023] like Figure 3 and Figure 4As shown, each template structure 811 has two first sliding pillars 813 spaced apart along its axial length on its inner side. The first sliding pillars 813 slide through the guide sleeves provided on the wall of the long cylinder 710 and enter the interior of the long cylinder 710. Inside the long cylinder 710, the inner ends of the two first sliding pillars 813 belonging to the same template structure 811 are fixedly welded to a beam 814. The beam 814 is made of channel steel or I-beam, and its length direction is consistent with the axis of the long cylinder 710. The sealing strip 812 is driven by a screw drive. At the center of the inner side of the sealing strip 812, a rotating column 815 is rotatably connected via a thrust bearing. The rotating column 815 is arranged perpendicular to the axis of the long cylinder 710. The middle section of the rotating column 815 is machined with a transmission thread, which forms a screw drive pair with the internally threaded cylinder fixed on the wall of the long cylinder 710. The rotating column 815 is located inside the innermost end of the long cylinder 710 and is fixedly installed with a driven tooth column 816. The driven tooth column 816 is constructed as a straight toothed rack gear with a long axial length. Several second sliding columns 817 are also fixedly connected to the inner side of the seal 812. The second sliding columns 817 are slidably disposed on the side wall of the long cylinder 710.

[0024] like Figure 3 and Figure 4As shown, the moving drive assembly includes a slide block 910 slidably mounted on the long straight track 720. The slide block 910 is cylindrical in shape, with an outer diameter smaller than the inner diameter of the long cylinder 710. A square through hole is formed in the center of the slide block 910. Several sets of support wheels 930 are installed on the four inner walls of the square hole 913, and guide grooves are formed on the top surface, bottom surface, and inside of the long straight track 720. This rolling fit is used to reduce the axial friction coefficient and suppress the swaying and overturning of the slide block 910 during travel. The slide block 910 achieves reciprocating axial displacement through a winding machine 951 located at the end of the long cylinder 710, in conjunction with a traction rope 952. The front end of the slide block 910 is machined with a chamfered structure 911 with a slope of 1:2 to 1:3. Its function is that when the slide block 910 enters the mold segment axially, the inclined surface forces the beam 814 to be pushed radially outward through sliding friction. The outer peripheral surface of the slide block 910 serves as a support surface. When the slide block 910 is axially positioned, this support surface forms a large-area rigid fit with the inner surfaces of the four beams 814, thereby replacing the chamfered structure 911 to maintain the radial expansion limit position of the template. Four drilling rigs 920 are symmetrically arranged inside the slide block 910. Each drilling rig 920 has an active toothed column 921 connected to its output end. The slide block 910 has axial clearance grooves 912 at the corresponding moving positions of the second slide column 817 on the four rotating columns 815 and the sealing strip 812. The tip circle of the active toothed column 921 protrudes from the side wall of the clearance groove 912. When the slide block 910 is axially aligned, the active toothed column 921 and the driven toothed column 816 form a straight tooth meshing relationship.

[0025] like Figure 3 and Figure 4As shown, to solve the problem of meshing interference between the active gear 921 and the driven gear 816, the drilling rig 920 is installed inside the slide 910 via an elastic support assembly 922. The elastic support assembly 922 is an arc-shaped elastic plate, allowing the drilling rig 920 to generate a certain amount of follow-up floating in the radial direction perpendicular to the axis of the rotating column 815. This effectively absorbs the impact load at the moment of gear engagement and compensates for radial clearance fluctuations, ensuring the continuity of power transmission. Since the active gear 921 of the drilling rig 920 must be completely aligned with the driven gear 816 of the rotating column 815 in the axial position to perform rotational drive, several semi-circular positioning holes 721 are machined along the length of the side wall of the long straight track 720, and an elastic ball head pin 940 is provided on the inner wall of the central square hole 913 of the slide 910. When the slide 910 moves to the preset gear meshing position of a certain mold segment under the action of the traction mechanism, the elastic ball head pin 940 automatically engages in the semi-circular positioning hole 721 of the long straight track 720 under the action of elastic force, generating mechanical resistance feedback. This feedback force is converted into an electrical signal by the tension sensor or displacement sensor of the winding machine 951, controlling the slide 910 to stop moving. At this time, the chamfered structure 911 of the slide 910 has completed the initial radial expansion of the four template structures 811 of the segment, and the support surface of the slide 910 is exactly placed on the inner side of the beam 814, realizing physical support. The driving tooth column 921 and the driven tooth column 816 are in an axially overlapping meshing state, which meets the conditions for initiating the helical locking.

[0026] The working principle of this invention utilizes a single axial traveling power source to achieve initial radial displacement through the inclined plane extrusion effect, and then achieves final interference self-locking and sealing through the mechanical force multiplication effect generated by the helical transmission pair.

[0027] The entire device is suspended inside the outer mold. At this time, the traction slide 910 is pulled and, under the pulling force of the traction mechanism, the slide 910 is axially displaced along the long straight track 720. When the slide 910 contacts the beam 814 of the template structure 811, which is in a radially contracted state, the inner edge of the beam 814 makes physical contact with the chamfered inclined surface of the slide 910. The axial traction force provided by the slide 910 generates a radial component force perpendicular to the axis through the inclined surface. As the slide 910 continues to feed axially, this radial component force drives the first sliding column 813 to overcome the self-weight of the template and the frictional force of motion within the guide hole of the long cylinder 710, generating an outward radial displacement. When the cylindrical body of the slide 910 is completely inside the beam 814, the inclined surface lifting process ends, and the beam 814 then presses against the outer peripheral support surface of the slide 910.

[0028] After the initial expansion of the template structure 811, the system enters the rigid self-locking stage. The drill rig 920 installed inside the slide block 910 starts, transmitting the rotational torque to the driven toothed column 816 and the rotating column 815 through the gear meshing pair. The helical transmission pair formed between the rotating column 815 and the wall of the long cylinder 710 converts the rotational torque into a linear thrust along the axial direction of the rotating column 815. This structure not only generates a huge lifting force to compress the steel template, but also has a helical self-locking function. When the drill rig 920 stops running, the position of the sealing strip 812 is absolutely stable without external power support. The sealing strip 812 is constructed as a wedge-shaped limiting structure that is wider on the inside and narrower on the outside, and its cross-section forms a geometric wedge that narrows outward. When the rotating column 815 pushes the sealing strip 812 into the longitudinal gap between the four template structures 811, the two oblique sides of the sealing strip 812 are interference-fitted with the edge of the template structure 811. After the seal 812 is in place, the radial outward force generated by the seal 812 attempts to further expand the template, while the beam 814 connected to the inner side of the template generates an inward reaction force due to the support of the inner wall of the long cylinder 710, so that the seal 812 and the template fit together tightly.

[0029] The drill rig 920 within the slide 910 is suspended by an elastic support assembly 922. When the slide 910 moves axially to the working position for alignment, if the tooth tip of the driving gear 921 interferes with the tooth tip of the driven gear 816, the elastic support assembly 922 allows the drill rig 920 to generate radial clearance displacement, thereby preventing the mechanism from jamming or being damaged. After the drill rig 920 starts, the gear automatically slides into the correct meshing position under the action of elastic force. In addition, the driven gear 816 is constructed as a long strip gear, its function being to accommodate the radial travel generated during the rotation of the rotating column 815. Since the axial length of the driven gear 816 covers the entire stroke range of the rotating column 815, the driving gear 921 can always output power on its long strip effective tooth surface, regardless of whether the seal 812 is in the initial position or the final locked position. This design ensures the integrity and stability of the power transmission chain under conditions of changing motion paths.

[0030] This device follows the principle of segmented independent operation and longitudinal coordinated work during implementation. Driven by the traction mechanism, the movable slide 910 reaches each mold segment one by one. This segment-by-segment locking method decomposes the complex expansion action over the entire length into multiple independent, controllable small-stroke actions. In the longitudinal dimension, the sealing overlap structure between adjacent mold segments serves a dual purpose of stress transfer and slurry blockage.

[0031] During demolding, when the slide block 910 returns and drives the rotating column 815 to rotate in the opposite direction, the seal 812 exits from the template gap. At this time, the template structure 811 is supported on the long cylinder 710 only by the first slide column 813. After the slide block 910 completely leaves, the template structure 811 has no supporting force, which facilitates demolding.

[0032] In actual implementation, the elastic ball pin 940 on the slide 910 engages with the semi-circular positioning hole 721 on the track to achieve physical positioning. Electrical signal feedback is provided through a microswitch integrated within the slide 910, instructing the winding machine 951 to stop and triggering the locking procedure of the drilling rig 920. This enables digital monitoring of the degree of locking of the entire mold length.

[0033] This invention abandons the traditional model where each internal mold requires an independent fixed power source at each action point or each mold segment, instead employing a single moving slide 910 as the core drive unit. The slide 910 is axially moved along the long straight track 720 by a winding machine 951, and the expansion and locking actions of all segments along the entire length can be completed cyclically using only one built-in drilling rig 920. This significantly reduces the number of electronic components inside the internal mold, eliminates complex internal wiring and piping, and lowers initial equipment purchase costs and subsequent maintenance difficulties.

[0034] This invention establishes a rigid mechanical self-locking system through the coupling of the wedge-shaped seal 812 and the screw drive mechanism. When the slide 910 enters the segment, its outer circumference directly provides rigid support, ensuring the geometric stability of the template in the expansion position. Subsequently, the seal 812 is pushed into the gap under the drive of the rotating column 815. Its wedge-shaped structure, wider inside and narrower outside, forms an interference fit with the edge of the template, transforming the originally loose segmented template into a rigid structure. This effectively resists the huge lateral pressure and vibration impact during concrete pouring, eliminating common quality defects such as formwork bulging and grout leakage.

[0035] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A self-locking segmented box girder inner mold based on internal wandering drive, characterized in that: The system includes a central support assembly, a mold housing assembly, and a moving drive assembly. The central support assembly includes a long cylinder (710) and a long straight track (720) fixedly disposed inside the long cylinder (710). The mold housing assembly is divided into several mold segments along the length of the long cylinder (710). Each mold segment includes four template structures (811) that enclose and form an inverted trapezoidal cylindrical structure, and four sealing strips (812) disposed at the adjacent gaps of the four template structures (811). The inner side of each template structure (811) is connected to a first sliding column (813) and a beam (814). The first sliding column (813) slides through the cylinder wall of the long cylinder (710), and the beam (814) is located on the long cylinder (710). 0) Inside; the inner side of the seal (812) is rotatably connected to a rotating column (815), the middle section of the rotating column (815) is provided with an external thread and is threadedly connected to the long cylinder (710), and the inner end of the rotating column (815) is provided with a driven toothed column (816); the moving drive assembly includes a slide (910) slidably disposed on the long straight track (720), and a traction mechanism for pulling the slide (910) to move; the front end of the slide (910) is provided with a chamfered structure (911) for opening the four template structures (811), and the interior of the slide (910) is provided with four drills (920), and the output end of the drills (920) is provided with an active toothed column (921) that cooperates with the driven toothed column (816).

2. The self-locking segmented box girder inner mold based on internal wandering drive according to claim 1, characterized in that: Two first sliding columns (813) are spaced apart along the length of the inner side of each template structure (811). After the two first sliding columns (813) are inserted into the long cylinder (710), their inner ends are fixed together with the beam (814). When the drilling rig (920) drives the rotating column (815) to rotate to push the seal (812) into the gap, the supporting surface of the sliding seat (910) always remains in contact with the inner side of the beam (814) for support.

3. The self-locking segmented box girder inner formwork based on internal wandering drive according to claim 1, characterized in that: The drilling rig (920) is mounted in the slide (910) by a flexible support assembly (922) configured to allow the drilling rig (920) to float in a direction perpendicular to the axis of the rotary column (815).

4. The self-locking segmented box girder inner formwork based on internal wandering drive according to claim 1, characterized in that: The driven toothed column (816) or the driving toothed column (921) is a long gear structure, and its axial length is greater than the radial displacement of the rotating column (815) during the thread unscrewing process, so as to ensure that the gear meshing is maintained throughout the entire process of the seal (812) being pushed outward.

5. The self-locking segmented box girder inner mold based on internal wandering drive according to claim 1, characterized in that: The inner side of the seal (812) is also fixedly connected with several second sliding columns (817). The second sliding columns (817) are slidably disposed on the side wall of the long cylinder (710). The slide block (910) has a cylindrical structure and four clearance grooves (912) are opened on its side for the beam (814), the second sliding columns (817) and the rotating column (815) to pass through. The tooth surface of the active tooth column (921) protrudes from the side wall of the clearance groove (912).

6. The self-locking segmented box girder inner formwork based on internal wandering drive according to claim 1, characterized in that: The long straight track (720) has semi-circular positioning holes (721) spaced apart along its length. The inner wall of the slide (910) is provided with an elastic ball pin (940) that mates with the semi-circular positioning holes (721). The position of the semi-circular positioning holes (721) corresponds to the gear meshing position of each mold.

7. The self-locking segmented box girder inner formwork based on internal wandering drive according to claim 1, characterized in that: The cross-sectional structure of the seal (812) is a wedge-shaped limiting structure with a wider inner side and a narrower outer side. The wedge-shaped limiting structure is specifically stepped or convex. The gap shape of the four template structures (811) after opening is adapted to the cross-sectional shape of the seal (812).

8. The self-locking segmented box girder inner formwork based on internal wandering drive according to claim 1, characterized in that: The end faces of two adjacent mold segments are connected by a sealing overlap structure, which is constructed as a stepped mating surface or a beveled mating surface.

9. The self-locking segmented box girder inner formwork based on internal wandering drive according to claim 1, characterized in that: The cross-section of the long straight track (720) is a square tube structure with slots on the upper and lower sides; the center of the slide (910) is provided with a square hole (913) through which the long straight track (720) passes, and the upper and lower inner walls of the square hole (913) are respectively provided with support wheels (930) that are supported in the slots of the long straight track (720).

10. The self-locking segmented box girder inner mold based on internal wandering drive according to claim 1, characterized in that: The traction mechanism includes a winding machine (951) fixed to one end of the long drum (710) and a traction rope (952) connected between the winding machine (951) and the slide (910); the long drum (710) is provided with fixed connecting seats (730) at both ends for connecting with an external gantry.

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