Combined formwork and construction method suitable for cantilever pouring of large-inclination arch bridge

Abstract

The application provides a combined formwork suitable for cantilever pouring of a large-inclination arch bridge, characterized in that the combined formwork comprises side formworks, bottom formworks and an inner formwork system, the side formworks and the bottom formworks are installed on a hanging basket, the inner formwork system comprises a bearing frame and a plurality of inner formworks, a walking system comprises displacement guide rails and a walking mechanism, the bearing frame is driven to move by the walking mechanism, a self-balancing support frame is arranged at the front end of the hanging basket, the front end of the displacement guide rails is connected with the self-balancing support frame, the rear end is supported by a rail tail support, front and rear support legs are arranged on the displacement guide rails at intervals, and a laser displacement range finder is arranged on the displacement guide rails. In the application, each inner formwork is connected with the bearing frame through a support system, real-time distance monitoring is performed through the laser displacement range finder, dynamic adjustment is performed through a distance-adjusting jack, the inner formwork system is supported by the elongation of the rail tail support in a supporting state, and the front and rear support legs are alternately elongated and retracted to provide walking support in a moving state, so that the working efficiency is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and in particular relates to a combined formwork and construction method suitable for cantilever casting of large-angle arch bridges. Background Technology

[0002] Arch bridges, with their advantages of high load-bearing capacity, strong spanning ability, high space utilization, and smooth and beautiful appearance, have become a competitive bridge type choice in mountainous construction. Cantilevered reinforced concrete box girder arch bridges, as a common construction technique for arch bridges, offer advantages such as good structural integrity, low cost, and minimal post-construction maintenance. However, during the on-site cantilever casting of arch bridge box girders, the inner formwork is usually erected using a scaffolding method. This method has disadvantages such as long formwork erection time, heavy workload for workers, numerous high-altitude operations, and difficulties in large-angle work. Furthermore, the concrete box girder contains transverse diaphragms, and the space in the middle of the diaphragms is narrow, making it impossible for existing inner formwork to move directly within the concrete box girder for continuous application. Formwork needs to be erected on both sides of the transverse diaphragms separately, resulting in long erection and dismantling times and low efficiency. Therefore, improvements are necessary. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a combined formwork and construction method suitable for cantilever casting of large-angle arch bridges.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows: A combined formwork suitable for cantilever casting of large-angle arch bridges includes side formwork, bottom formwork, and an inner formwork system. The side formwork and bottom formwork are detachably installed on the hanging basket. The inner formwork system includes a support frame and several inner formworks around the support frame. An adjustment system for raising and lowering the inner formworks is provided on the support frame. The traveling system includes a displacement guide rail and a traveling mechanism on the displacement guide rail. The traveling mechanism drives the support frame to move. A self-balancing support frame is provided at the front end of the hanging basket. The front end of the displacement guide rail is connected to the self-balancing support frame. The rear end is supported on the cast-in-place segment by a rail tail bracket. Two support legs, front and rear, are provided at intervals on the displacement guide rail. The traveling mechanism includes a rear pad plate, a hydraulic jack on the front side of the rear pad plate, a stop plate on the rear side, the stop plate and the rear pad plate are hinged by a pivot, and a tension spring is provided between the stop plate and the rear pad plate. A support block is provided near the pivot position of the stop plate. A push plate is provided at the front end of the extension rod of the hydraulic jack, and push plates are provided on the upper and lower sides of the push plate. The distance between the two push plates is greater than the height of the rear pad plate. The push plate is connected to the support frame. The self-balancing support includes a frame, an adjustment box at the upper end of the frame, a displacement guide rail extending into the adjustment box, and a distance adjustment jack and several support springs between the bottom plate of the adjustment box and the displacement guide rail. A fixing component is provided on the side wall of the adjustment box, and a matching pin hole is provided on the displacement guide rail. A laser displacement rangefinder is provided on the displacement guide rail. The distance between the displacement guide rail and the hanging basket is measured by the laser displacement rangefinder. The control system receives the real-time displacement data from the laser displacement rangefinder and compares it with a set value. Then, it controls the extension rod of the distance adjustment jack to ensure that the distance between the displacement guide rail and the hanging basket remains constant.

[0005] Furthermore, the support frame is provided with several ear plates, and the adjustment system includes hydraulic push rods that are hinged to each ear plate. The end of the hydraulic push rod that is not on the ear plate is connected to the corresponding inner template.

[0006] Furthermore, the fixing component includes a longitudinal fixing pin and a vertical fixing pin, and the displacement guide rail is provided with a longitudinal fixing pin mating pin hole and a vertical fixing pin mating pin hole.

[0007] Furthermore, sliding wheels are provided between the displacement guide rail and the support frame.

[0008] Furthermore, a roller is provided at the upper end of the support spring.

[0009] Furthermore, both the front and rear support legs are positioned on the rail tail bracket at the end furthest from the adjustment box.

[0010] Furthermore, the front support leg and the rear support leg have the same structure, both including a telescopic rod and rollers at the lower end of the telescopic rod.

[0011] Furthermore, the laser displacement rangefinder is mounted on the lower surface of the displacement guide rail.

[0012] A construction method using the template includes the following steps: S1. After the previous concrete box girder segment is poured and reaches the design strength, the control system sends a signal to extend the rear support leg. After the extension is in place, the rail tail support retracts. S2. Pull out the vertical fixing pin to allow the displacement guide rail to move vertically, and turn on the laser displacement rangefinder to monitor the distance from the displacement guide rail to the hanging basket in real time. S3. Loosen the anchoring rod at the top of the hanging basket to lower the hanging basket vertically. The hydraulic jack will extend and retract. After the anti-reverse plate touches the push plate, the anti-reverse plate will disengage from the slot. S4. During the jacking process of the inclined box arch bridge, the distance from the lower surface of the displacement guide rail to the hanging basket is measured in real time by a laser displacement rangefinder. The control system compares the real-time measured value with the set value and sends a signal to the adjusting jack to adjust the distance between the displacement guide rail and the hanging basket, so as to ensure that the distance between the displacement guide rail and the hanging basket is constant. S5. The hanging basket drives the displacement guide rail forward. When the rear support leg reaches the diaphragm, the control system sends a signal to control the front support leg to extend into place, and then controls the rear support leg to retract. After crossing the diaphragm, the hanging basket moves to the position of the segment to be poured. S6. After the hanging basket is adjusted to the correct position, adjust the bottom template and tighten the anchor rods to move the hanging basket into place. Lock the displacement guide rail and self-balancing bracket with the fasteners. The control system sends a signal to control the rail tail bracket to extend into place. Then the front support leg retracts to complete the fixing of the displacement guide rail. S7. Tie the bottom slab and web reinforcement of the box girder, and then move the inner formwork. S8. The control system sends a signal to control the retraction of each hydraulic push rod of the adjustment system, thereby causing each inner template of the inner mold system to retract into place. The control system sends a signal to control the extension of the hydraulic jack. After the anti-reverse plate disengages from the push plate, it presses against the slot. As the hydraulic jack continues to extend, the inner mold system moves forward along the displacement guide rail. S9. After the inner mold system is moved into place, the control system sends a signal to control the hydraulic push rod to extend, so that each inner mold can be opened, and the outer mold can be installed in place by cable hoisting. S10. Finally, tie the top slab reinforcement and seal the cantilever end with formwork to complete the concrete pouring of the box girder.

[0013] Compared with existing technologies, the present invention has the following advantages: In this invention, each inner formwork is connected to the load-bearing frame through a support system. When the inner formwork system contracts, it can smoothly pass through narrow transverse diaphragms. Real-time distance monitoring is performed using a laser displacement rangefinder, and dynamic adjustment is made using adjustable jacks. This ensures that the formwork is subjected to uniform force and the support status is not affected during the movement of the hanging basket of the large-angle arch bridge. In the supported state, the inner formwork system is supported by the extension of the rail tail support. In the moving state, the front and rear support legs alternately extend and retract to provide walking support, realizing the crossing of the inner formwork at the transverse diaphragm. This effectively improves the construction convenience of the combined formwork and increases work efficiency. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of the structure created by this invention; Figure 2 A side structural schematic diagram is provided for this invention; Figure 3 This is a schematic diagram of the adjustment box part in the present invention; Figure 4A schematic diagram of the displacement guide rail installed on the self-balancing support frame in the present invention; Figure 5 This is a schematic diagram of the automatic walking system part of the present invention. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] A composite formwork suitable for cantilever casting of arch bridges with large inclination angles, such as Figures 1 to 5As shown, the system includes side templates 1, bottom templates 2, and an inner template system 3. The side templates and bottom templates are detachably installed on the hanging basket 4. The inner template system includes a support frame 5 and several inner templates 6 around the support frame. An adjustment system 7 for raising and lowering the inner templates is provided on the support frame. The traveling system includes a displacement guide rail 8 and a traveling mechanism on the displacement guide rail. The traveling mechanism drives the support frame to move. A self-balancing support frame 9 is provided at the front end of the hanging basket. The front end of the displacement guide rail is connected to the self-balancing support frame (the self-balancing support frame is set on the hanging basket). The rear end is supported by a rail tail bracket 10 on the poured section. Front support legs 12 and rear support legs 13 are provided at intervals on the displacement guide rail. Several slots 14 are provided on the upper and lower side walls of the displacement guide rail. Specifically, the slots can be sawtooth or triangular structures, as long as the anti-reverse plate can abut against the slot to achieve force transmission.

[0020] The traveling mechanism includes a rear pad plate 15, a hydraulic jack 16 on the front side of the rear pad plate, and a stop plate 17 on the rear side. The stop plate and the rear pad plate are hinged together by a pivot 18, and a tension spring 19 is provided between the stop plate and the rear pad plate. A support block 20 is provided on the stop plate near the pivot, so that when the tension spring tightens the stop plate, the support block abuts against the rear pad plate. A push plate 21 is provided at the front end of the hydraulic jack extension rod, and push plates 22 are provided on the upper and lower sides of the push plate. The distance between the two push plates is greater than the height of the rear pad plate. The push plate is connected to the support frame. Specifically, the front end of the hydraulic jack is connected to the push plate, and the rear pad plate is welded to the rear end of the hydraulic jack. The stop plate can rotate around the pivot on the rear pad plate, and the two are tightened by the tension spring. The stop plate has two states: a jacking state and a moving state. In the jacking state, the stop plate is clamped to the slot to provide support for jacking. In the moving state, the stop plate contacts the push plate and is released from the constraint of the slot.

[0021] The self-balancing support includes a frame 23, with an adjustment box 24 at the upper end of the frame. The front end of the displacement guide rail extends into the adjustment box. An adjustment jack 25 and several support springs 26 are located between the bottom plate of the adjustment box and the displacement guide rail. Fixing components are located on the side wall of the adjustment box. Matching pin holes are provided on the displacement guide rail, and a laser displacement rangefinder 33 is installed on the displacement guide rail. The laser displacement rangefinder measures the distance between the displacement guide rail and the hanging basket. The control system 11 receives the real-time displacement data from the laser displacement rangefinder and compares it with the set value. Then, it controls the adjustment jack to extend its rod to ensure that the distance between the displacement guide rail and the hanging basket remains constant. The fixing components include longitudinal fixing pins 27 and vertical fixing pins 28. The displacement guide rail has longitudinal fixing pin mating pin holes and vertical fixing pin mating pin holes. The vertical fixing pin mating pin holes are vertically arranged elongated holes. A push plate is welded to the middle of the support frame, and booster plates are welded to the upper and lower sides of the push plate.

[0022] The support frame is equipped with several ear plates 29. The adjustment system includes hydraulic push rods 30 hinged to each ear plate. The end of the hydraulic push rod, different from the ear plate, is connected to the corresponding inner template (which can be hinged). That is, each inner template is connected to the support frame through a support system, enabling both retracted and supported states. Each inner template is fixed to the ear plate of the support frame by the hydraulic push rods. A sliding wheel 31 is provided between the displacement guide rail and the support frame. The inner side of the support frame contacts the displacement guide rail through the sliding wheel, allowing it to slide along the displacement guide rail under the thrust of the hydraulic jack. In other words, the displacement guide rail is the basic support for the longitudinal sliding of the inner template system, the anti-reverse plate provides reaction force, and the jack provides power.

[0023] Typically, the sliding wheels are installed inside the support frame to ensure smooth sliding on the displacement guide rail during position adjustments. Rollers are located at the upper end of the support springs, contacting the displacement guide rail to ensure smooth, unobstructed movement during guide rail adjustments. Both the front and rear support legs are positioned on the rail tail bracket at the end furthest from the adjustment box. The front and rear support legs can provide independent support, facilitating stable crossing of crossbeams during template movement.

[0024] The front and rear support legs have identical structures, both including telescopic rods and rollers at the lower ends of the telescopic rods. During the movement of the hanging basket, the inner formwork system is in a supported state, with vertical support achieved through self-balancing brackets and a traveling system. During the cantilever casting of a large-angle arch bridge, the arch inclination angle gradually decreases, and the hanging basket inclination angle decreases accordingly. Therefore, during the jacking process of the hanging basket, it is necessary to continuously adjust the distance from the front end of the displacement guide rail to the hanging basket to ensure the stability of the formwork under stress and deformation in the supported state. After pulling out the vertical fixing pin, the rigid constraints of the displacement guide rail and the hanging basket can be released, and then the inclination angle of the displacement guide rail can be adjusted by extending and retracting the adjusting jack. A laser displacement rangefinder is installed on the lower surface of the displacement guide rail. The control system receives the real-time displacement data from the laser displacement rangefinder, compares it with the set value, and then controls the extension and retraction of the adjusting jack.

[0025] When using the automated combined formwork and construction method for cantilever casting of large-angle arch bridges provided by this invention, the hanging basket is first positioned and the displacement guide rail is moved forward. During the forward movement of the displacement guide rail, the laser displacement rangefinder measures the distance from the displacement guide rail to the hanging basket in real time and adjusts it automatically. The front and rear support legs alternately cross the diaphragm. Then, the inner formwork system in the supported state contracts and moves along the displacement guide rail under the jacking action of the hydraulic jack, passes through the diaphragm, and moves to the concrete segment to be poured. Then, the inner formwork is supported again, and after the outer formwork is hoisted, the next segment of concrete can be poured.

[0026] The inverted triangular formwork provides support for the formwork and concrete, and provides a working surface for on-site pouring. The bottom formwork, side formwork, and inner formwork system provide bottom, outer, and inner support during the arch box girder pouring process. A self-balancing support frame, with longitudinal main beams fixed to the formwork, provides positioning and support for the inner formwork system. The control system includes a PLC controller connected to a hydraulic station, providing hydraulic power to the entire formwork system. The control system receives command signals, performs calculations and analysis, and then sends adjustment signals to control the formwork's extension and retraction states and travel. A traveling system is used for the longitudinal movement of the inner formwork system. This invention achieves automated formwork support and movement in confined spaces with diaphragms, as well as real-time monitoring and correction during construction. This significantly improves construction speed, saves labor costs, effectively ensures project quality, and solves many problems in the cantilever construction of large-angle arch bridges, such as the difficulty of formwork support and the difficulty of moving formwork at diaphragms.

[0027] The following is a construction method using the template, comprising the following steps: S1. After the previous concrete box girder segment is poured and reaches the design strength, the control system sends a signal to extend the rear support leg. After the extension is in place, the rail tail support retracts. S2. Pull out the vertical fixing pin to allow the displacement guide rail to move vertically, and turn on the laser displacement rangefinder to monitor the distance from the displacement guide rail to the hanging basket in real time. S3. Loosen the anchoring rod at the top of the hanging basket to lower the hanging basket vertically. The hydraulic jack will extend and retract. After the anti-reverse plate touches the push plate, the anti-reverse plate will disengage from the slot. S4. During the jacking process of the inclined box arch bridge, the distance from the lower surface of the displacement guide rail to the hanging basket is measured in real time by a laser displacement rangefinder. The control system compares the real-time measured value with the set value and sends a signal to the adjusting jack to adjust the distance between the displacement guide rail and the hanging basket, so as to ensure that the distance between the displacement guide rail and the hanging basket is constant. S5. The hanging basket drives the displacement guide rail forward. When the rear support leg reaches the diaphragm, the control system sends a signal to control the front support leg to extend into place, and then controls the rear support leg to retract. After crossing the diaphragm, the hanging basket moves to the position of the segment to be poured. S6. After the hanging basket is adjusted to the correct position, adjust the bottom template and tighten the anchor rods to move the hanging basket into place. Lock the displacement guide rail and self-balancing bracket with the fasteners. The control system sends a signal to control the rail tail bracket to extend into place. Then the front support leg retracts to complete the fixing of the displacement guide rail. S7. Tie the bottom slab and web reinforcement of the box girder, and then move the inner formwork. S8. The control system sends a signal to control the retraction of each hydraulic push rod of the adjustment system, thereby causing each inner template of the inner mold system to retract into place. The control system sends a signal to control the extension of the hydraulic jack. After the anti-reverse plate disengages from the push plate, it presses against the slot. As the hydraulic jack continues to extend, the inner mold system moves forward along the displacement guide rail. S9. After the inner mold system is moved into place, the control system sends a signal to control the hydraulic push rod to extend, so that each inner mold can be opened, and the outer mold can be installed in place by cable hoisting. S10. Finally, tie the top slab reinforcement and seal the cantilever end with formwork to complete the concrete pouring of the box girder.

[0028] In this invention, each inner formwork is connected to the load-bearing frame through a support system. When the inner formwork system contracts, it can smoothly pass through narrow transverse diaphragms. Real-time distance monitoring is performed using a laser displacement rangefinder, and dynamic adjustment is made using adjustable jacks. This ensures that the formwork is subjected to uniform force and the support status is not affected during the movement of the hanging basket of the large-angle arch bridge. In the supported state, the inner formwork system is supported by the extension of the rail tail support. In the moving state, the front and rear support legs alternately extend and retract to provide walking support. This enables the inner formwork to cross the transverse diaphragm, effectively improving the construction convenience of the combined formwork, increasing work efficiency, and effectively overcoming the difficulties of high-altitude and large-angle operations in the prior art.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite formwork suitable for cantilever casting of arch bridges with large inclination angles, characterized in that: The system includes side formwork, bottom formwork, a traveling system, and an inner formwork system. The side and bottom formwork are detachably installed on the hanging basket. The inner formwork system includes a support frame and several inner formworks surrounding the support frame, and an adjustment system for raising and lowering the inner formworks is provided on the support frame. The traveling system includes a displacement guide rail and a traveling mechanism on the displacement guide rail, which drives the support frame to move. A self-balancing support frame is provided at the front end of the hanging basket, and the front end of the displacement guide rail is connected to the self-balancing support frame. The rear end is supported by a rail tail bracket, and front and rear support legs are provided at intervals on the displacement guide rail. The traveling mechanism includes a rear pad plate, with a hydraulic jack on the front side of the rear pad plate and a stop plate on the rear side. The stop plate and the rear pad plate are hinged by a pivot, and a tension spring is provided between the stop plate and the rear pad plate. A support is provided on the stop plate near the pivot. The support block has a push plate at the front end of the hydraulic jack extension rod, and booster plates on both sides of the push plate. The distance between the two booster plates is greater than the height of the rear pad plate. The push plate is connected to the support frame. The self-balancing support includes a frame body with an adjustment box at the upper end. The front end of the displacement guide rail extends into the adjustment box. An adjustment jack and several support springs are provided between the bottom plate of the adjustment box and the displacement guide rail. Fixing parts are provided on the side wall of the adjustment box. Matching pin holes are provided on the displacement guide rail. A laser displacement rangefinder is provided on the displacement guide rail. The distance between the displacement guide rail and the hanging basket is measured by the laser displacement rangefinder. The control system receives the real-time displacement data from the laser displacement rangefinder and compares it with the set value. Then, it controls the extension rod of the adjustment jack to move, so that the distance between the displacement guide rail and the hanging basket remains consistent.

2. The combined formwork for cantilever casting of large-angle arch bridges according to claim 1, characterized in that: The support frame is equipped with several ear plates. The adjustment system includes hydraulic push rods that are hinged to each ear plate. The end of the hydraulic push rod that is not on the ear plate is connected to the corresponding inner template.

3. A combined formwork suitable for cantilever casting of arch bridges with large inclination angles according to claim 1, characterized in that: The fastener includes a longitudinal fixing pin and a vertical fixing pin, and the displacement guide rail is provided with a longitudinal fixing pin mating pin hole and a vertical fixing pin mating pin hole.

4. A combined formwork suitable for cantilever casting of arch bridges with large inclination angles according to claim 1, characterized in that: Sliding wheels are provided between the displacement guide rail and the support frame.

5. A combined formwork for cantilever casting of arch bridges with large inclination angles according to claim 1, characterized in that: A roller is provided at the upper end of the support spring.

6. A combined formwork for cantilever casting of arch bridges with large inclination angles according to claim 1, characterized in that: Both the front and rear support legs are located on the rail tail bracket at the end away from the adjustment box.

7. A combined formwork suitable for cantilever casting of arch bridges with large inclination angles according to claim 1, characterized in that: The front and rear support legs have the same structure, both including a telescopic rod and rollers at the lower end of the telescopic rod.

8. A combined formwork for cantilever casting of arch bridges with large inclination angles according to claim 1, characterized in that: The laser displacement rangefinder is mounted on the lower surface of the displacement guide rail.

9. A construction method using the template according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. After the previous concrete box girder segment is poured and reaches the design strength, the control system sends a signal to extend the rear support leg. After the extension is in place, the rail tail support retracts. S2. Pull out the vertical fixing pin to allow the displacement guide rail to move vertically, and turn on the laser displacement rangefinder to monitor the distance from the displacement guide rail to the hanging basket in real time. S3. Loosen the anchoring rod at the top of the hanging basket to lower the hanging basket vertically. The hydraulic jack will extend and retract. After the anti-reverse plate touches the push plate, the anti-reverse plate will disengage from the slot. S4. The distance from the lower surface of the displacement guide rail to the hanging basket is measured in real time by a laser displacement rangefinder. The control system compares the real-time measured value with the set value and then sends a signal to the adjusting jack to adjust the distance between the displacement guide rail and the hanging basket. S5. The hanging basket drives the displacement guide rail forward. When the rear support leg reaches the diaphragm, the control system sends a signal to control the front support leg to extend into place, and then controls the rear support leg to retract. After crossing the diaphragm, the hanging basket moves to the position of the segment to be poured. S6. After the hanging basket is adjusted to the correct position, adjust the bottom template and tighten the anchor rods to move the hanging basket into place. Lock the displacement guide rail and self-balancing bracket with the fasteners. The control system sends a signal to control the rail tail bracket to extend into place. Then the front support leg retracts to complete the fixing of the displacement guide rail. S7. Tie the bottom slab and web reinforcement of the box girder, and then move the inner formwork. S8. The control system sends a signal to control the retraction of each hydraulic push rod of the adjustment system, thereby causing each inner template of the inner mold system to retract into place. The control system sends a signal to control the extension of the hydraulic jack. After the anti-reverse plate disengages from the push plate, it presses against the slot. As the hydraulic jack continues to extend, the inner mold system moves forward along the displacement guide rail. S9. After the inner mold system is moved into place, the control system sends a signal to control the hydraulic push rod to extend, so that each inner mold can be opened, and the outer mold can be installed in place by cable hoisting. S10. Finally, tie the top slab reinforcement and seal the cantilever end with formwork to complete the concrete pouring of the box girder.

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