Large immersed tube full-section prefabricated lightweight template system

Abstract

A large immersed tube full-section prefabricated lightweight formwork system comprises an inner formwork rack and an outer formwork rack, the inner formwork rack comprises an inner formwork fixing frame and an inner supporting rod assembly, the outer formwork rack comprises a top truss and two outer side trusses, an inner formwork comprises an inner formwork body and a lower chamfering part, and the inner supporting rod assembly comprises an inner supporting connecting rod and an inner telescopic oil cylinder. According to the embodiment of the invention, the inner template mounted on the inner template rack extends to the lower chamfer, and the three inner support connecting rods which are in the same straight line under the support of the two inner telescopic oil cylinders are used as the inclined support structure, so that the concrete which is firstly solidified at the lower chamfer can upwards support the horizontal part at the top of the inner template through the inclined support structure; and under the conditions of large span and large weight, the top plate reinforcing steel bars are stably supported, and the situation that the prefabrication precision of the immersed tube top plate is reduced due to downward deformation of the top plate reinforcing steel bars is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of immersed tube tunnel construction, and in particular relates to a large-scale immersed tube full-section prefabricated lightweight template system. Background Art

[0002] In the existing immersed tube tunnel construction technology, immersed tube tunnels are constructed by prefabricating pipe sections and sinking them into the water for installation. This method usually includes the use of internal and external formwork gantry devices during the prefabrication process, and the prefabrication of each tunnel section is completed by tying steel bars and pouring concrete in the space between the formworks. However, with the requirement for greater traffic capacity in tunnel design, the structural size and span of the immersed tube tunnel need to be increased to accommodate more lanes and other facilities. This design requirement brings many technical challenges.

[0003] First, large-size and large-span immersed tube structures require more complex steel cages and more concrete, which increases construction difficulty and cost. In particular, due to the increased weight and span of the steel cage, the internal formwork gantry device may deform due to heavy pressure during construction, affecting the accuracy of the prefabricated pipe section, which has an adverse effect on the construction quality and service life of the tunnel.

[0004] Secondly, the external formwork platform device usually includes two outer trusses and one top truss. The outer trusses are located on both sides of the pipe section, while the top truss spans the two trusses to form a portal structure. As the size of the pipe section increases, the span of the top truss increases significantly, causing the bending moment borne by the outer truss to increase exponentially. In order to cope with this increase in bending moment, the outer truss needs to be widened to enhance its strength, but this further increases the span of the top truss, resulting in an increase in material consumption and a more complex formwork platform device, which significantly increases the project cost.

[0005] Third, the construction of immersed tube tunnels is often subject to strict environmental and time constraints. During the prefabrication of the pipe section, an internal formwork stand is usually used as a construction platform for tying the top plate steel bars. However, this method requires waiting for the concrete to reach a certain strength before removing the internal formwork, which results in a longer construction period, especially when the construction window is short, and may not catch up with the best sinking time. In order to shorten the construction period, a special top plate steel bar tying cradle is usually set up on the construction site for operation. However, due to the heavy weight of the large-span top plate steel bars, when the cradle is withdrawn, the steel bars need to be connected to the top truss through steel cables for support conversion, but the top truss has a large span and it is difficult to effectively support such heavy steel bars, which may eventually cause the steel bars to sink or deform, affecting the prefabrication accuracy.

[0006] In addition, the prefabrication of immersed tubes needs to be carried out in a dry dock on the shore. However, due to the limitation of the embankment construction facilities, the dry dock usually has a limited floor space. Prefabrication of large-span immersed tubes in a limited space results in a narrow working space in the dry dock, especially the gap between the immersed tube prefabrication area and the dock wall and the space between adjacent prefabrication areas. In order to maintain the stability of the formwork, diagonal braces need to be set at the bottom of the outer truss, which further reduces the available space in the dry dock and brings inconvenience to material transportation and construction operations.

[0007] In summary, when faced with large-size and large-span structures, the existing immersed tube tunnel construction technology has problems such as large material consumption of formwork scaffolding, limited construction space, extended construction period, and difficulty in ensuring prefabrication accuracy, which urgently need to be improved and optimized. Summary of the invention

[0008] In view of the shortcomings existing in the related art, the present invention provides a large-scale immersed tube full-section prefabricated lightweight formwork system to solve the problems of insufficient stability and high material consumption when the current immersed tube prefabricated formwork system is applied to large-span structures.

[0009] The present invention provides a large immersed tube full-section prefabricated lightweight formwork system, comprising an inner formwork stand equipped with an inner formwork and an outer formwork stand equipped with an outer formwork, wherein a casting space is formed between the outer formwork and the inner formwork; The inner mold stand comprises an inner mold fixing frame and an inner support rod assembly, inner mold plates are installed on both sides of the inner mold fixing frame, and inner support rod assemblies are installed between the inner mold plates and the inner mold fixing frame; The outer formwork platform includes a top truss and two outer trusses, the inner formwork platform is located between the two outer trusses, the two outer trusses are both equipped with outer formworks, the two ends of the top truss are respectively installed on the two outer trusses, the top truss is equipped with a support system conversion mechanism for supporting the top plate steel bars and making them resistant to bending and compression, the support system conversion mechanism includes a bending and compression tensioning assembly and a suspension support assembly, the bending and compression tensioning assembly has a prestressed steel strand installed and tightened along the top truss, which is used to provide prestress to the top truss to improve the bending and compression resistance of the top truss, and the suspension support assembly has a plurality of fixed pulleys for supporting the same linkage steel cable, which is used to make the top truss evenly stressed when the linkage steel cable is connected to and supports the top plate steel bars; The internal template includes: The inner mold body has a first end hinged on the top of the inner mold fixing frame, and is divided into an inner top plate portion, an inner upper chamfer portion and an inner side plate portion in sequence toward its second end, the inner top plate portion is horizontally arranged, the inner upper chamfer portion is located at the upper chamfer of the casting space, and the inner side plate portion is vertically arranged; A lower chamfered portion is hinged to the second end of the inner mold body and is located at the lower chamfer of the casting space; The inner support rod assembly includes: There are three inner support links connected in series, namely a first inner support link, a second inner support link, and a third inner support link, wherein the third inner support link is connected to the first end of the inner mold body, and the first inner support link is connected to the lower chamfered portion; There are two inner telescopic cylinders, namely the first inner telescopic cylinder and the second inner telescopic cylinder. One end of the first inner telescopic cylinder is connected to the inner side plate, and the other end is connected to the connecting part of the first inner support link and the second inner support link; one end of the second inner telescopic cylinder is connected to the bottom of the inner mold fixing frame, and the other end is connected to the third inner support link. The first inner telescopic cylinder and the second inner telescopic cylinder push the three inner support links to the same straight line.

[0010] In some embodiments, the support system conversion mechanism includes a bending, compression and tensioning component, and the bending, compression and tensioning component includes: There are two tension beams, which are respectively installed at both ends of the top truss, and both tension beams have anchors; Both ends of the prestressed steel strand are passed through and fixed to the anchors at the corresponding ends, and the two tension beams tighten the prestressed steel strands through the anchors.

[0011] In some of the embodiments, the top truss includes a plurality of composite beams spaced apart in the longitudinal direction, and adjacent composite beams are connected by a plurality of Bailey plates disposed in the longitudinal direction and arranged in a transverse beam arrangement; The composite beam comprises at least two transverse beams spaced longitudinally and a longitudinal beam longitudinally connecting two adjacent transverse beams. The transverse beam comprises a plurality of Bailey plates connected in series transversely. The longitudinal beam is a single Bailey plate spaced longitudinally and a plurality of Bailey plates are spaced transversely in the space between the same adjacent transverse beams.

[0012] In some embodiments, the support system conversion mechanism further includes a suspension support assembly, and the suspension support assembly includes: The through beam is arranged longitudinally and fixedly connected to each composite beam in sequence; Fixed pulleys, multiple of which are installed along the through beam; A movable pulley is provided below the space between adjacent fixed pulleys; The linkage steel cable alternately passes around each fixed pulley and each movable pulley from one end to the other end in the longitudinal direction, and both ends of the linkage steel cable are connected to a retractable cable extending from an electric winch installed on the corresponding bottom surface; The supporting steel cables have multiple ends, one end of which is connected to a corresponding movable pulley, and the other end is connected to the top plate steel bars below. The supporting steel cables pull down each fixed pulley to make the linkage steel cables wavy along the longitudinal direction. When the two electric winches synchronously reel in and release the corresponding cables, the two ends of the linkage steel cables are synchronously pulled, and the linkage steel cables synchronously pull each fixed pulley upwards, and each supporting steel cable synchronously lifts the top plate steel bars.

[0013] In some of the embodiments, a walking travel mechanism is installed at the bottom of the outer truss, and the walking travel mechanism includes a longitudinal movement component and a jacking component; The longitudinal movement assembly includes a longitudinal movement guide rail, a longitudinal movement support frame and a longitudinal movement oil cylinder. The longitudinal movement guide rail is placed longitudinally on the ground, the longitudinal movement support frame is slidably installed on the longitudinal movement guide rail, and the longitudinal movement oil cylinder is installed on the longitudinal movement guide rail and pushes and pulls the longitudinal movement support frame to slide; The jacking assembly includes a jacking support frame and a jacking cylinder. The jacking support frame is installed on the outer truss, and the jacking cylinder is installed on the longitudinal support frame, and pushes and pulls the jacking support frame to perform lifting and lowering.

[0014] In some of the embodiments, the walking travel mechanism further includes a transverse movement assembly, the transverse movement assembly includes a transverse movement support frame and a transverse movement cylinder, the longitudinal movement support frame is laterally provided with a transverse movement guide rail, the transverse movement support frame is slidably mounted on the transverse movement guide rail, the transverse movement cylinder is mounted on the transverse movement guide rail, and pushes and pulls the transverse movement support frame to slide; The top of the outer truss is equipped with a mold opening and closing guide rail and a mold opening and closing cylinder. The mold opening and closing guide rail is arranged horizontally and a mold opening and closing moving seat is slidably installed. The mold opening and closing moving seat is hinged with a mold opening and closing support seat. The mold opening and closing support seat is fixedly installed on the end of the top truss, and the mold opening and closing cylinder is connected to the mold opening and closing moving seat.

[0015] In some embodiments, the inner support rod assembly further includes a plurality of first inner reinforcement rods, and first inner reinforcement rods are installed between the inner top plate portion, the inner upper chamfered portion and the inner side plate portion and the third inner support link, and the first inner reinforcement rods are fixed at the same point on the third inner support link.

[0016] In some embodiments, the inner support rod assembly further includes a second inner reinforcement link, wherein three second inner reinforcement links are connected in series, wherein the first second inner reinforcement link is connected to the inner side plate portion, and the third second inner reinforcement link is connected to the bottom of the inner mold body, and the second inner telescopic cylinder is connected to the bottom of the inner mold body by connecting the connection point of the second second inner reinforcement link and the third second inner reinforcement link; When the three inner supporting connecting rods are in the same straight line, the three second inner reinforcing connecting rods are in the same horizontal straight line.

[0017] In some of the embodiments, when the three inner supporting links are in the same straight line, the first inner telescopic cylinder is parallel to the second inner telescopic cylinder.

[0018] In some embodiments, the inner mold fixing frame includes a bottom beam and two waist beams respectively fixedly connected to two ends of the bottom beam, and the top ends of the two waist beams are connected so that the inner mold fixing frame has a triangular structure; The inner mold stand further includes a bearing support mechanism, on which two lifting cylinders are vertically mounted on a bearing support frame arranged on the top of the bearing support mechanism, and both ends of the bottom beam are respectively mounted on the two lifting cylinders; The inner mold fixing frame further includes two inner mold supporting seats, which are respectively located on both sides and are fixedly connected to the bottom beam and a corresponding waist beam; When the lifting cylinder lifts the inner mold fixing frame to a height position corresponding to the prefabricated state, the bearing support frames all fall on the corresponding detachably installed unloading blocks on the bearing support frames.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows: the inner formwork installed on the inner formwork stand in the embodiment of the present invention extends to the lower chamfer, and three inner support connecting rods in a straight line supported by two inner telescopic cylinders serve as a diagonal bracing structure, so that the concrete solidified first at the lower chamfer can support the horizontal part of the top of the inner formwork upward through the diagonal bracing structure, so that it can more stably support the top plate steel bars, and the top plate steel bars are stably supported in the case of large span and heavy weight, avoiding the decrease in the prefabrication accuracy of the immersed tube top plate due to the downward deformation of the top plate steel bars; the concrete at the lower chamfer can also support the side of the inner formwork laterally through the diagonal bracing structure and the outer inner telescopic cylinder, so as to maintain the lateral stability of the inner formwork after pouring a large amount of concrete, and ensure the prefabrication accuracy of the immersed tube side wall. Compared with thickening the structure supporting the inner formwork in the inner formwork stand, the inner support rod assembly used uses less material, reduces the material consumption of the formwork system, reduces the weight, makes it more convenient to move, and solves the problems of insufficient stability and high material consumption when the current immersed tube prefabricated formwork system is applied to large fast reading structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the large immersed tube full-section prefabricated lightweight formwork system of the present invention; Figure 2 The schematic diagram of the structure of the inner mold trolley in the large immersed tube full-section prefabricated lightweight template system of the present invention Figure 1 ; Figure 3 The schematic diagram of the structure of the inner mold trolley in the large immersed tube full-section prefabricated lightweight template system of the present invention Figure 2 ; Figure 4 The schematic diagram of the structure of the inner mold trolley in the large immersed tube full-section prefabricated lightweight template system of the present invention Figure 3 ; Figure 5 The schematic diagram of the structure of the inner mold trolley in the large immersed tube full-section prefabricated lightweight template system of the present invention Figure 4 ; Figure 6It is a structural schematic diagram of the bending and compression-resistant tensioning components on the top truss in the large immersed tube full-section prefabricated lightweight formwork system of the present invention; Figure 7 It is a structural schematic diagram of the outer formwork trolley in the large immersed tube full-section prefabricated lightweight formwork system of the present invention; Figure 8 It is a partial enlarged view of the opening and closing mold assembly part of the large immersed tube full-section prefabricated lightweight template system of the present invention; Fig. 9 The schematic diagram of the structure of the walking travel mechanism in the large immersed tube full-section prefabricated lightweight formwork system of the present invention is shown in FIG. Figure 1 ; Fig.10 The schematic diagram of the structure of the walking travel mechanism in the large immersed tube full-section prefabricated lightweight formwork system of the present invention is shown in FIG. Figure 2 ; Fig.11 The schematic diagram of the structure of the inner mold fixing frame and the bearing support mechanism at the end of the inner mold trolley in the large immersed tube full-section prefabricated lightweight template system of the present invention Figure 1 ; Fig.12 The schematic diagram of the structure of the inner mold fixing frame and the bearing support mechanism at the end of the inner mold trolley in the large immersed tube full-section prefabricated lightweight template system of the present invention Figure 2 ; In the figure: 1. Inner mold stand; 11. Inner mold fixing frame; 111. Bottom beam; 112. Waist beam; 12. Inner support rod assembly; 121. Inner support connecting rod; 121A. First inner support connecting rod; 121B. Second inner support connecting rod; 121C. Third inner support connecting rod; 122. Inner telescopic oil cylinder; 122A. First inner telescopic oil cylinder; 122B. Second inner telescopic oil cylinder; 123. First inner reinforcement rod; 124. Second inner reinforcement rod; 13. Inner mold support seat; 14. Unloading block; 2. External formwork stand; 21. Top truss; 211. Composite beam; 211A. Transverse beam; 211B. Longitudinal beam; 212. Bailey plate; 22. External truss; 3. Inner mold plate; 31. Inner mold body; 32. Lower chamfered portion; 33. Inner top plate portion; 34. Inner upper chamfered portion; 35. Inner side plate portion; 4. External formwork; 5. Casting space; 6. Middle gallery stand; 7. Middle gallery formwork; 8. Suspension support assembly; 81. Through beam; 82. Fixed pulley; 83. Moving pulley; 84. Linkage steel cable; 85. Support steel cable; 9. Bending and compression tensioning components; 91. Tension beams; 92. Prestressed steel strands; 93. Anchors; 10. Walking travel mechanism; 10A. Longitudinal movement assembly; 101. Longitudinal movement guide rail; 102. Longitudinal movement support frame; 103. Longitudinal movement cylinder; 10B. Lifting assembly; 104. Lifting support frame; 105. Lifting cylinder; 10C. Transverse movement assembly; 106. Transverse movement support frame; 107. Transverse movement cylinder; 108. Transverse movement guide rail; 20. Tension bolts; 201. Opening and closing mold guide rails; 202. Opening and closing mold cylinders; 203. Opening and closing mold moving seats; 204. Opening and closing mold supporting seats.

[0021] 30. Load-bearing support mechanism; 301. Load-bearing support frame; 303. Outrigger; 304. Lifting cylinder; 305. Longitudinal adjustment seat; 306. Correction cylinder; 307. Synchronous rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1As shown, in an illustrative embodiment of a large-scale immersed tube full-section prefabricated lightweight formwork system of the present invention, the large-scale immersed tube full-section prefabricated lightweight formwork system includes an inner formwork stand 1 equipped with an inner formwork 3 and an outer formwork stand 2 equipped with an outer formwork 4, and a casting space 5 is formed between the outer formwork 4 and the inner formwork 3. By tying steel bars in the casting space 5 and filling it with concrete, the immersed tube section can be prefabricated.

[0027] An immersed tube tunnel is generally composed of multiple pipe sections. In order to improve prefabrication efficiency, each pipe section is divided into multiple pipe sections and prefabricated in sequence.

[0028] The inner mold stand 1 includes an inner mold fixing frame 11 and an inner support rod assembly 12. The inner mold 3 is installed on both sides of the inner mold fixing frame 11. The inner support rod assembly 12 is installed between the inner mold 3 and the inner mold fixing frame 11. The inner support rod assembly 12 supports the inner mold 3, so that the inner mold 3 remains stable, and vertically and laterally supports the side wall steel bars and the top plate steel bars. In addition, when the concrete solidifies to meet the strength requirements, the inner support rod assembly 12 can control the inner mold 3 to retract, so that it is out of contact with the concrete, so that the inner mold stand 1 can be demoulded and moved to the construction area of ​​the next pipe section.

[0029] The outer formwork stand 2 includes a top truss 21 and two outer trusses 22. The two outer trusses 22 are respectively located on both sides of the pipe segment prefabrication construction area. The inner formwork stand 1 is located between the two outer trusses 22. The two outer trusses 22 are both equipped with outer formworks 4. The two ends of the top truss 21 are respectively installed on the two outer trusses 22 to form a gantry structure. The inner sides of the two outer trusses 22 are both equipped with outer formworks 4, so as to face the inner inner formwork 3 to form a vertical space between the two, so that steel bars are tied in the space and concrete is poured to form the side walls of the immersed tube. The top truss is equipped with a support system conversion mechanism for supporting the top plate steel bars and making the top truss resistant to bending and compression. The support system conversion mechanism includes a bending and compression tensioning assembly and a suspension support assembly. The bending and compression tensioning assembly has a prestressed steel strand installed and tightened along the top truss. The suspension support assembly has a plurality of fixed pulleys for supporting the same linkage steel cable. Therefore, during the prefabrication process, the top plate steel bars are suspended and connected to perform the support system conversion, thereby withdrawing the top plate steel bar binding frame and sending it into the inner mold stand, thereby improving the prefabrication operation efficiency, and when the support system is converted, the tightened The prestressed steel strands provide horizontal prestress for the top truss. The prestress keeps the top truss straight and improves its ability to resist bending and compression. The linkage steel cables are connected to support the top plate steel bars, and multiple fixed pulleys evenly support the linkage steel cables, thereby distributing the load of the top plate steel bars to the top truss through multiple fixed pulleys, thus avoiding bending deformation caused by excessive local force on the top truss. This improves the compression and bending resistance of the top truss from two aspects, enabling it to support the top plate steel bars with larger loads of large immersed tubes, and avoiding downward bending deformation of the top truss under the load of the top plate steel bars.

[0030] When the immersed tube has two driving passages, there is a middle corridor between the two driving passages. The prefabricated formwork system also includes a middle corridor stand 6 equipped with a middle corridor formwork 7. At this time, there are two inner formwork stands 1, which are respectively located on the left and right sides of the middle corridor stand 6. The left and right sides of the middle corridor formwork 7 respectively form a vertical space with the corresponding inner formwork 3, so that steel bars are tied and concrete is poured in the space to form the middle partition wall of the immersed tube. The middle corridor is formed between the two middle partition walls.

[0031] The inner mold trolley is arranged longitudinally and has a certain length. Figures 2 to 5 It is a schematic diagram of the structure of the middle part of the inner mold trolley in the longitudinal direction. Figure 2 As shown, the inner formwork 3 includes an inner formwork body 31 and a lower chamfered portion 32. The inner formwork body 31 is the main part of the inner formwork 3, and the lower chamfered portion 32 is a portion of a corner at the bottom. The two ends of the inner formwork body 31 are respectively set as the first end and the second end. The first end of the inner formwork body 31 is hinged on the top of the inner formwork fixing frame 11, so that the inner formwork 3 as a whole can swing up and down, and can be separated from the surface of the top plate and the side wall when demoulding; the inner formwork body 31 is divided into an inner top plate portion 33, an inner upper chamfered portion 34 and an inner side plate portion 35 from the first end to the second end. During prefabrication, the inner top plate portion 33 is horizontally arranged, the inner upper chamfered portion 34 is located at the upper chamfer of the casting space 5, and the inner side plate portion 35 is vertically arranged. After the cast concrete is solidified, it contacts the bottom surface of the top plate, the inner upper chamfered portion 34 contacts the upper chamfered inner wall of the top of the side wall, and the inner side plate portion 35 contacts the vertical inner wall in the middle of the side wall. The lower chamfered portion 32 is located at the lower chamfer of the pouring space 5. After the poured concrete solidifies, the bottom of the lower chamfered portion 32 contacts the top surface of the bottom plate, the middle portion contacts the inner wall of the lower chamfer at the bottom of the side wall, and the upper portion contacts the vertical inner wall of the lower portion of the side wall. The lower chamfered portion 32 is hinged to the second end of the inner mold body 31, so that it can bend inward relative to the inner mold body 31, further retracting the inner mold plate 3 so that its bottom is out of contact with the top surface of the bottom plate of the immersed tube.

[0032] The inner support rod assembly 12 includes an inner support link 121 and an inner telescopic cylinder 122. There are three inner support links 121 connected in series, namely the first inner support link 121A, the second inner support link 121B, and the third inner support link 121C. The third inner support link 121C is connected to the first end of the inner mold body 31, and the first inner support link 121A is connected to the lower chamfered portion 32.

[0033] There are two inner telescopic cylinders 122, namely, a first inner telescopic cylinder 122A and a second inner telescopic cylinder 122B. One end of the first inner telescopic cylinder 122A is connected to the inner side plate 35, and the other end is connected to the connection between the first inner support link 121A and the second inner support link 121B. One end of the second inner telescopic cylinder 122B is connected to the bottom of the inner mold fixing frame 11, and the other end is connected to the third inner support link 121C. In order to ensure smooth telescopic movement of the inner telescopic cylinder 122, the connections at both ends of the first inner telescopic cylinder 122A and the second inner telescopic cylinder 122B are both hinged.

[0034] During the prefabrication of the pipe segment, after the top plate reinforcement is tied, the top truss 21 is suspended by the steel cable to support the top plate reinforcement, and the support system is converted. Then the inner mold stand 1 enters the reinforcement cage, and the pads tied on the top plate reinforcement fall onto the surface of the inner mold 3, so that the inner mold stand 1 supports the top plate reinforcement. The piston rods of the first inner telescopic cylinder 122A and the second inner telescopic cylinder 122B are both extended, as shown in FIG. Figure 2 As shown, the inner formwork 3 is pushed up to a prefabricated state. In the prefabricated state, the three inner supporting links 121 are pushed up to the same straight line, the inner top plate portion 33 is horizontal, the inner side plate portion 35 is vertical, the bottom of the lower chamfer portion 32 is attached to the top surface of the cast bottom plate, the top of the lower chamfer portion 32 and the inner side plate portion 35 are in the same vertical plane, and the middle part of the lower chamfer portion 32 is attached to the cast lower chamfer.

[0035] When the inner formwork 3 is in the prefabricated state, the lower chamfer of the bottom plate supports the lower chamfer 32 of the inner formwork 3 to support the bottom of the inner formwork 3; at the same time, the top of the inner formwork 3 is supported by three inner support links 121 connected in a line, so that when the top steel bars fall on the top of the inner formwork 3 and a large amount of concrete is poured to prefabricate the top plate of the immersed tube, it remains stable and the prefabricated immersed tube is stable. In addition, the lower chamfer 32 forms lateral support for the side of the inner formwork body 31 through the inner support link and the second inner telescopic cylinder 122B, which improves the lateral stability of the inner formwork 3 when the side wall is poured and improves the prefabrication accuracy of the side wall. The inner support rod assembly 12 is composed of rod-shaped components such as the inner support link 121 and the inner telescopic cylinder 122. While improving the stability of the inner formwork 3, the structure occupies a small space and is light in weight, which reduces the inner formwork 3 and facilitates the retraction and movement of the inner formwork trolley.

[0036] After the concrete solidifies and reaches the set strength, Figure 3 As shown, the first inner telescopic cylinder 122A is retracted, pulling the first inner support link 121A and the second inner support link 121B to bend into a V shape, so that the first inner support link 121A pulls the lower chamfered portion 32 to swing upward, so that it is out of contact with the top surface of the bottom plate, the inner wall of the lower chamfer and the inner wall of the bottom of the side wall. Figure 4As shown, the second inner extension cylinder is then retracted, pulling the third inner support link 121C to swing downward, thereby causing the inner mold body 31 to swing downward, breaking away from the contact with the bottom surface of the top plate, the upper chamfered inner wall and the middle and upper inner wall of the side wall, and adjusting the inner mold plate 3 to the retracted state. At this time, as shown in FIG. Figure 5 As shown, the inner mold support mechanism 30 of the inner mold stand lowers the inner mold fixing frame, so that the inner mold plate is completely separated from the contact with the inner wall of the roadway, and the inner mold stand 1 is longitudinally moved to the construction area of ​​the next pipe section.

[0037] In the above-mentioned schematic embodiment, the inner formwork 3 installed on the inner formwork stand 1 of the large-scale immersed tube full-section prefabricated lightweight formwork system extends to the lower chamfer, and is supported by two inner telescopic cylinders 122. Three inner support connecting rods 121 in a straight line serve as a diagonal bracing structure, so that the concrete solidified first at the lower chamfer can support the top horizontal part of the inner formwork 3 upward through the diagonal bracing structure, so that it can more stably support the top plate steel bars, and the top plate steel bars are stably supported in the case of large span and heavy weight, avoiding the reduction of the prefabrication accuracy of the immersed tube top plate due to the downward deformation of the top plate steel bars; The chamfered concrete can also provide lateral support to the sides of the inner formwork 3 through the diagonal bracing structure and the outer inner telescopic cylinder 122, thereby maintaining the lateral stability of the inner formwork 3 after pouring a large amount of concrete, and ensuring the prefabrication accuracy of the immersed tube side walls. Compared with thickening the structure supporting the inner formwork 3 in the inner formwork stand 1, the inner support rod assembly 12 used uses less material, reduces the material consumption of the formwork system, reduces the weight, makes it more convenient to move, and solves the problems of insufficient stability and high material consumption when the current immersed tube prefabricated formwork system is applied to large fast-reading structures.

[0038] In some embodiments, Figure 6 As shown, the support system conversion mechanism includes a bending and compression tensioning assembly 9, and the bending and compression tensioning assembly 9 includes a tensioning beam 91 and a prestressed steel strand 92. There are two tensioning beams 91, which are respectively installed at the two ends of the top truss 21, and each tensioning beam 91 has an anchor 93. Both ends of the prestressed steel strand 92 are passed through and fixed to the anchor 93 at the corresponding end, and the two tensioning beams 91 tighten the prestressed steel strand 92 through the anchor 93.

[0039] After the top plate reinforcement is tied with the top plate reinforcement tyre, the top plate reinforcement is connected to the top truss 21 through a steel cable to convert the support system, and then the top plate reinforcement tyre is longitudinally moved to the construction area of ​​the next pipe section. At this time, the weight of the top plate reinforcement is fully supported by the top truss 21. The prestressed steel strand 92 provides prestress to the top truss 21 through the tension beams 91 at both ends, thereby improving the bending resistance of the top truss 21, stably supporting the top plate reinforcement without compression deformation, thereby avoiding the top plate reinforcement from collapsing downward, and ensuring that the inner mold trolley for installing the inner mold 3 enters the reinforcement cage smoothly.

[0040] In some embodiments, Figure 7 As shown, the top truss 21 includes a plurality of composite beams 211 arranged at intervals in the longitudinal direction, and adjacent composite beams 211 are connected by a plurality of Bailey plates 212 arranged in the longitudinal direction and arranged in a transverse beam arrangement.

[0041] like Figure 6 As shown, the composite beam 211 includes at least two transverse beams 211A arranged at intervals in the longitudinal direction and a longitudinal beam 211B longitudinally connecting two adjacent transverse beams 211A. The transverse beam 211A includes a plurality of Bailey plates 212 connected in series in the transverse direction. The longitudinal beam 211B is a single Bailey plate 212 arranged longitudinally, and a plurality of Bailey plates 212 are arranged in the transverse direction at intervals in the space between the same adjacent transverse beams 211A.

[0042] The increase in the span of the immersed tube leads to an increase in the weight of the top steel bars. When the top truss 21 adopts a traditional truss structure, in order to avoid the top truss 21 being compressed and deformed downward due to the conversion of the support system, a more robust truss structure is required, which increases the weight of the top truss 21 and is inconvenient for the movement and transportation of the outer mold stand 2. Compared with the traditional truss structure, the top truss 21 is a Bailey beam assembled from Bailey sheets 212, which is reusable and has a lower cost. It has strong stability under the prestressing of the bending and compression tensioning components 9, can stably support, does not require a robust support structure, and reduces the weight of the top truss 21.

[0043] In the composite beam 211, the spacing between the longitudinally adjacent transverse beams 211A is smaller than the longitudinal spacing between adjacent composite beams 211, that is, the top truss 21 has a denser structure at the composite beam 211, so that the composite beam 211 serves as the skeleton of the top truss 21, and there is enough space between adjacent composite beams 211 for lifting materials such as steel bars.

[0044] In some embodiments, Figure 7 As shown, the support system conversion mechanism further includes a suspension support assembly 8, and the suspension support assembly 8 includes a through beam 81, a fixed pulley 82, a movable pulley 83, a linkage steel cable 84 and a support steel cable 85.

[0045] The through beam 81 is arranged longitudinally and fixedly connected to each composite beam 211 in sequence. Multiple fixed pulleys 82 are installed along the through beam 81. There are movable pulleys 83 below the space between adjacent fixed pulleys 82. The linkage steel cable 84 alternately passes through each fixed pulley 82 and each movable pulley 83 from one end to the other end in the longitudinal direction, and both ends of the linkage steel cable 84 are connected to the retractable cable extending from an electric winch (not shown in the drawings) installed on the corresponding ground. There are multiple supporting steel cables 85, one end of which is connected to a corresponding movable pulley 83, and the other end is connected to the top plate steel bar below.

[0046] The movable pulleys 83 are all located on the upper side of the linkage steel cable 84, which exerts downward pressure on the linkage steel cable 84, making the linkage steel cable 84 wavy in the longitudinal direction. When the support system is switched, the two electric winches synchronously reel in the corresponding retractable cables, synchronously pull the two ends of the linkage steel cable 84, and the inclination angle of the linkage steel cable 84 on both sides of the movable pulley 83 becomes smaller, so that the linkage steel cable 84 synchronously pulls each fixed pulley 82 upward, so that each fixed pulley 82 synchronously tightens the support steel cable 85, and then the support steel cable 85 lifts the top plate steel bar, so that it is out of contact with the top plate steel bar binding cradle, so that the top plate steel bar binding cradle can be moved to the next pipe section construction area.

[0047] By pushing the fixed pulley 82 upward through the linkage steel cable 84, not only can the top plate reinforcement be suspended and fixed at each position synchronously, but also the movable pulley 83 is always aligned with the center line of the two adjacent fixed pulleys 82, so that the top truss 21 always supports the top plate reinforcement in the vertical direction, thereby improving the stability of the top plate reinforcement when suspended and fixed. In addition, the load of the top plate reinforcement can be evenly distributed to each fixed pulley 82 through the linkage steel cable 84, so that the top truss 21 is evenly stressed, avoiding the bending and deformation of the top truss 21 caused by excessive local stress. In addition, the support system is converted using an electric winch and a suspension support assembly 8, which has a simple structure and is light in weight, and is very easy to install and disassemble.

[0048] Since the pipe section is divided into multiple pipe sections for prefabrication, when one pipe section is prefabricated, both the inner mold stand 1 and the outer mold stand 2 need to be moved to the prefabrication area of ​​the next pipe section. In order to move, both the inner mold stand 1 and the outer mold stand 2 are installed with a walking mechanism.

[0049] In some embodiments, Figures 9 and 10 As shown, the walking mechanism of the outer mold stand 2 is a walking type, and a walking type traveling mechanism 10 is installed at the bottom of the outer truss 22. The walking type traveling mechanism 10 includes a longitudinal movement component 10A and a lifting component 10B.

[0050] The longitudinal movement assembly 10A includes a longitudinal movement rail 101, a longitudinal movement support frame 102 and a longitudinal movement cylinder 103. The longitudinal movement rail 101 is placed longitudinally on the ground, the longitudinal movement support frame 102 is slidably mounted on the longitudinal movement rail 101, and the longitudinal movement cylinder 103 is mounted on the longitudinal movement rail 101 and pushes and pulls the longitudinal movement support frame 102 to slide. The lifting assembly 10B includes a lifting support frame 104 and a lifting cylinder 105. The lifting support frame 104 is installed on the outer truss 22, and the lifting cylinder 105 is installed on the longitudinal support frame 102, and pushes and pulls the lifting support frame 104 to move up and down.

[0051] When the outer mold platform 2 moves, the piston rod of the lifting cylinder 105 extends, first lifting the lifting support frame 104 upward, so that the outer mold platform 2 rises, and the bottom ends of the outer trusses 22 are lifted off the ground. The piston rod of the longitudinal displacement cylinder 103 extends, pushing the longitudinal displacement support frame 102 to slide forward along the longitudinal displacement guide rail 101, and the lifting support frame 104 moves forward longitudinally, so that the outer mold platform 2 moves forward longitudinally. The piston rod of the lifting cylinder 105 is retracted, and the lifting support frame 104 is lowered, so that the outer mold platform 2 falls, and the bottom end of the outer truss 22 falls to the ground. The piston rod of the lifting cylinder 105 is further retracted, and the longitudinal displacement support frame 102 is connected to the longitudinal displacement guide rail 101 and lifted to the ground. The piston rod of the longitudinal displacement piston rod is retracted, pulling the vacated longitudinal displacement guide rail 101 to move forward longitudinally. The piston rod of the lifting cylinder 105 is extended, and the longitudinal displacement guide rail 101 is lowered to the ground.

[0052] The above-mentioned method is repeated cyclically, with the longitudinal guide rail 101 serving as a foot that is first lifted, then moved forward, and finally dropped. The outer mold stand 2 gradually moves forward as the longitudinal guide rail 101 moves forward, thereby achieving the movement of the outer mold stand 2 in a walking manner.

[0053] The walking mechanism of the existing outer mold stand 2 is a wheeled structure, with guide rails laid on the ground, and motor-driven wheels installed on the outer mold stand 2. The wheels roll on the guide rails to achieve the movement of the outer mold stand 2. However, since the outer mold stand 2 is relatively heavy, it is difficult to start and brake when it moves on the wheels, and it is difficult to stop at the correct position, and it is also difficult to fine-tune the position after stopping. The walking mechanism of the present application has a smaller distance per step, and the longitudinal guide rail 101 is vacant when moving, and will not be affected by the load pressure, and can move accurately to achieve precise movement, thereby ensuring the precise alignment of the outer mold stand 2 with the construction area, so that the prefabrication work performed using the outer mold stand 2 is more accurate.

[0054] In some embodiments, the walking travel mechanism 10 further includes a transverse moving assembly 10C, the transverse moving assembly 10C includes a transverse moving support frame 106 and a transverse moving oil cylinder 107, the longitudinal moving support frame 102 is laterally provided with a transverse moving guide rail 108, the transverse moving support frame 106 is slidably mounted on the transverse moving guide rail 108, the transverse moving oil cylinder 107 is mounted on the transverse moving guide rail 108, and pushes and pulls the transverse moving support frame 106 to slide; like Figure 8 As shown, the top of the outer truss 22 is installed with a mold opening and closing guide rail 201 and a mold opening and closing cylinder 202. The mold opening and closing guide rail 201 is horizontally arranged and slidably installed with a mold opening and closing movable seat 203. The mold opening and closing movable seat 203 is hinged with an open and close mold support seat 204. The open and close mold support seat 204 is fixedly installed on the end of the top truss 21. The mold opening and closing cylinder 202 is connected to the open and close mold movable seat 203.

[0055] After the concrete is solidified to a predetermined strength and the side walls and top plates are prefabricated, in addition to the inner formwork 3, the outer formwork 4 also needs to be demolded. When the outer formwork 4 is demolded, the mold opening and closing cylinder 202 and the lateral movement cylinder 107 operate synchronously, synchronously pushing the mold opening and closing movable seat 203 and the lateral movement support frame 106 to move both outward, so that the top and bottom of the outer truss 22 are synchronously moved outward, and the side formwork is separated from the outer wall of the immersed tube side plate to achieve demolding.

[0056] The demoulding of the outer formwork 4 is driven by the transverse movement assembly 10C and the opening and closing mold assembly, so that the top and bottom of the outer truss 22 are synchronized during the outward transverse movement, and remain stable during the movement, continuously and stably supporting the top truss 21 to avoid collapse due to instability during the movement and protect the cast pipe sections.

[0057] In some embodiments, the inner support rod assembly 12 further includes a plurality of first inner reinforcement rods 123, and first inner reinforcement rods 123 are installed between the inner top plate portion 33, the inner upper chamfered portion 34 and the inner side plate portion 35 and the third inner support link 121C, and the first inner reinforcement rods 123 are fixed at the same point on the third inner support link 121C.

[0058] The lower chamfer of the bottom plate directly supports the top plate reinforcement above the middle of the top of the inner mold trolley through the lower chamfer portion 32 of the inner mold plate 3 and three inner support links 121 located in the same straight line. At the same time, the support of the lower chamfer of the bottom plate is transmitted to each first inner reinforcement rod 123 through the third inner support link 121C, and then transmitted to the inner top plate portion 33, the inner upper chamfer portion 34 and the inner side plate portion 35, so that the rest of the top plate reinforcement and the side wall reinforcement can be supported by the lower chamfer of the bottom plate, so that the support effect of the lower chamfer of the bottom plate covers the rest of the surface of the entire roadway except the bottom surface, further improving the stability of the side wall reinforcement and the top plate reinforcement, and improving the accuracy of the prefabrication of the roadway space.

[0059] In some embodiments, the inner support rod assembly 12 further includes a second inner reinforcing link 124, and there are three second inner reinforcing links 124 connected in series, with the first, second, and third being connected in sequence. The first second inner reinforcing link 124 is connected to the inner side plate 35, and the third second inner reinforcing link 124 is connected to the bottom of the inner mold body 31. The second inner telescopic cylinder 122B is connected to the bottom of the inner mold body 31 by connecting the connection points of the second second inner reinforcing link and the third second inner reinforcing link.

[0060] When the three inner support links 121 are in the same straight line, the three second inner reinforcement links 124 are in the same horizontal straight line, so that the inner mold fixing frame 11 can support the inner template 3 laterally through the two inner reinforcement links, and the supporting effect is perpendicular to the part of the inner template 3 facing the side wall reinforcement, thereby improving the stability of the lateral support. In addition, the inner mold fixing frame 11 can form a vertical support for the second inner telescopic cylinder 122B through the inner reinforcement link, and then form more points of support for the inner template 3 through the third inner support link 121C and the first inner reinforcement rod 123, so that the inner mold fixing frame 11 can provide more comprehensive upward support for each inner template 3, thereby improving the stability of the inner template 3.

[0061] In some embodiments, when the three inner support links 121 are in the same straight line, the first inner telescopic cylinder 122A is parallel to the second inner telescopic cylinder 122B, and the inner mold fixing frame 11 transmits the supporting force through the inner support link 121 and the first inner telescopic cylinder 122A in parallel to the inner plate portion 35 of the inner mold body 31 through the second inner reinforcement link and the second inner telescopic cylinder 122B, so that the inner mold fixing frame 11 can support the side of the inner mold plate 3 at multiple angles, thereby improving the stability of the inner mold plate 3 during prefabrication and improving the prefabrication accuracy.

[0062] In some embodiments, tension bolts 20 are installed between the inner formwork 3 and the relative outer formwork 4. The inner formwork 3 laterally supports the outer formwork 4 through the tension bolts. In the case where no diagonal brace is provided at the bottom of the outer formwork stand 2, the stability of the outer formwork 4 can be maintained during concrete pouring, thereby reducing the width of the outer formwork stand 2 and alleviating its occupation of the construction space. There is no need to disassemble the diagonal brace when moving, making the outer formwork stand 2 easier to use and move in a small construction space.

[0063] In some embodiments, Figure 11 to Figure 12 As shown, the inner mold fixing frame 11 includes a bottom beam 111 and two waist beams 112. The bottom ends of the two waist beams 112 are respectively fixedly connected to the two ends of the bottom beam 111, and the top ends of the two waist beams 112 are fixedly connected to each other, so that the bottom beam 111 and the two waist beams 112 form a triangular structure.

[0064] The inner mold stand 1 further includes a load-bearing support mechanism 30 , which includes a load-bearing support frame 301 and a support leg 303 installed at the bottom end of the load-bearing support frame 301 and capable of being raised and lowered.

[0065] Two lifting cylinders 304 are vertically installed on the bearing support frame 301, and the two ends of the bottom beam 111 are respectively installed on the two lifting cylinders 304, so that the inner mold fixing frame 11 and the inner support rod assembly 12 connected thereto can be lifted and lowered through the lifting cylinders 304, so that when demolding or entering the steel cage, the inner mold plate 3 is lowered to break away from the contact with the top plate of the immersed tube, or the inner mold stand 1 can enter the steel cage more smoothly.

[0066] The legs 303 are lowered to fix the load-bearing support frame 301 at the current position, and the lifting cylinder 304 lifts the inner mold fixing frame 11 and the inner support rod assembly 12 connected thereto to the prefabricated state, so that the ground infrastructure in the dry dock supports the load-bearing support frame 301 through the legs 303, and then supports the inner mold fixing frame 11 and the inner mold plate installed thereon through the load-bearing support frame 301. Both ends of the inner mold stand 1 have a load-bearing support mechanism 30, so that both ends of the inner mold fixing frame 11 are supported, and the inner mold plate and the top plate steel bars thereon are carried. When the walking mechanism of the inner mold stand 1 moves, the legs 303 are raised to prevent the legs 303 from touching the ground or hitting the prefabricated immersed tube to cause travel obstruction.

[0067] The inner mold fixing frame 11 further includes two inner mold supporting seats 13, which are respectively located on both sides and are fixedly connected to the bottom beam 111 and a corresponding waist beam 112. Even if the two inner mold supporting seats 13 are respectively fixedly installed at the left and right lower corners of the triangular structure of the inner mold fixing frame, the support of the bottom beam 111 to the waist beam 112 is enhanced, the structural strength of the inner mold fixing frame is improved, and the structure is kept stable under the downward pressure of a large amount of poured concrete, thereby maintaining the stability of the inner mold plate.

[0068] like Fig.12 As shown, before pouring concrete, the lifting cylinder 304 lifts the inner mold fixing frame to a predetermined height position, and pushes the inner mold to the prefabricated state, thereby adjusting the inner mold stand to the prefabricated state, and then concrete can be poured between the inner and outer molds for prefabrication. When the lifting cylinder 304 lifts the inner mold fixing frame to the corresponding height position of the prefabricated state, the bearing support frame 301 falls on the corresponding detachable unloading block 14 on the bearing support frame 301, so that when pouring concrete, the unloading block 14 bears more of the load generated by the weight of the concrete, reducing the pressure of the lifting cylinder 304, and ensuring that the lifting cylinder 304 is under load for a long time without decompression and shrinkage.

[0069] The concrete poured between the inner and outer formwork transfers the load from top to bottom and from both sides to the center to the inner formwork, so that the inner formwork fixing frame bears the lateral loads on both sides and the vertical load from above. The loads in two directions act on the waist beam 112, causing the waist beam 112 to have a tendency to swing inward and downward relative to the bottom beam 111. The bottom beam 111 can support the waist beam 112 vertically and laterally through the installed inner formwork support seat 13 to offset the lateral loads applied on both sides and above, thereby improving the stability of the inner formwork fixing frame. In addition, the inner formwork support seat 13 falls on the unloading block 14, and the lateral load and vertical load borne by the waist beam 112 will first be transferred to the inner formwork support seat 13, and then more will be transferred to the load-bearing support frame 301 through the unloading block 14, reducing the load on the bottom beam 111, achieving the joint load of the load-bearing support frame 301 and the bottom beam 111, and avoiding deformation due to excessive load on a single beam structure.

[0070] like Fig.11 As shown, in order to ensure that the inner mold fixing frame is in an accurate longitudinal position in the steel cage, two lifting cylinders 304 are respectively installed on two longitudinal adjustment seats 305 that are longitudinally slidably installed on the bearing support frame 301, and the correction cylinder 306 installed on the bearing support frame 301 is connected to a longitudinal adjustment seat 305, so as to push and pull its longitudinal movement, thereby adjusting the longitudinal position of the inner mold fixing frame. In order to ensure that the two longitudinal adjustment seats 305 move longitudinally synchronously, a synchronization rod 307 is installed between the two. The synchronization rod 307 adopts a detachable installation method, so that the synchronization rod 307 is removed when the unloading block 14 is installed, providing space for the placement of the unloading block 14, and the unloading block 14 remains stable under the load, so that it can support the corresponding longitudinal adjustment seat 305 from the inner side, and maintain its longitudinal position stability without special fixing of the longitudinal adjustment seat 305, avoiding the longitudinal displacement of the inner membrane plate caused by the longitudinal load, and reducing the pressure of the correction cylinder 306 when supporting and positioning in the longitudinal direction.

[0071] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0072] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A large immersed tube full-section prefabricated lightweight formwork system, characterized in that: It comprises an inner mold stand equipped with an inner mold plate and an outer mold stand equipped with an outer mold plate, and a casting space is formed between the outer mold plate and the inner mold plate; The inner mold stand comprises an inner mold fixing frame and an inner support rod assembly, the inner mold plates are installed on both lateral sides of the inner mold fixing frame, and the inner support rod assembly is installed between the inner mold plate and the inner mold fixing frame; The outer formwork platform comprises a top truss and two outer trusses, the inner formwork platform is located between the two outer trusses, the two outer trusses are both equipped with the outer formwork, the two ends of the top truss are respectively installed on the two outer trusses, the top truss is equipped with a support system conversion mechanism for supporting the top plate steel bars and making them resistant to bending and compression, the support system conversion mechanism comprises a bending and compression tensioning assembly and a suspension support assembly, the bending and compression tensioning assembly has a prestressed steel strand installed and tightened along the top truss, which is used to improve the bending and compression resistance of the top truss by providing prestress to the top truss, and the suspension support assembly has a plurality of fixed pulleys for supporting the same linkage steel cable, which is used to make the top truss evenly stressed when the linkage steel cable is connected to and supports the top plate steel bars; The inner template comprises: The inner mold body has a first end hinged on the top of the inner mold fixing frame, and is divided into an inner top plate portion, an inner upper chamfer portion and an inner side plate portion in sequence toward its second end, the inner top plate portion is horizontally arranged, the inner upper chamfer portion is located at the upper chamfer of the casting space, and the inner side plate portion is vertically arranged; A lower chamfered portion, hinged to the second end of the inner mold body, and located at the lower chamfer of the casting space; The inner support rod assembly comprises: There are three inner support links connected in series, namely a first inner support link, a second inner support link, and a third inner support link, wherein the third inner support link is connected to the first end of the inner mold body, and the first inner support link is connected to the lower chamfered portion; There are two inner telescopic cylinders, namely a first inner telescopic cylinder and a second inner telescopic cylinder. One end of the first inner telescopic cylinder is connected to the inner side plate, and the other end is connected to the connecting part of the first inner support link and the second inner support link; one end of the second inner telescopic cylinder is connected to the bottom of the inner mold fixing frame, and the other end is connected to the third inner support link. The first inner telescopic cylinder and the second inner telescopic cylinder push the three inner support links to the same straight line.

2. According to claim 1, the large immersed tube full-section prefabricated lightweight formwork system is characterized in that: The bending and compression resistant tensioning assembly comprises: There are two tension beams, which are respectively installed at two ends of the top truss, and each of the tension beams has an anchor; Both ends of the prestressed steel strand are passed through and fixed on the anchor at the corresponding end, and the two tension beams tighten the prestressed steel strand through the anchor.

3. According to claim 2, the large immersed tube full-section prefabricated lightweight formwork system is characterized in that: The top truss comprises a plurality of composite beams spaced apart in the longitudinal direction, and adjacent composite beams are connected by a plurality of Bailey plates arranged in the longitudinal direction and arranged in the transverse direction; The composite beam comprises at least two transverse beams spaced longitudinally and a longitudinal beam longitudinally connecting two adjacent transverse beams. The transverse beam comprises a plurality of Bailey plates connected in series transversely. The longitudinal beam is a single Bailey plate spaced longitudinally and a plurality of Bailey plates are spaced transversely in the space between the same adjacent transverse beams.

4. According to claim 3, the large immersed tube full-section prefabricated lightweight formwork system is characterized in that: The suspension support assembly comprises: A through beam is arranged longitudinally and fixedly connects each of the composite beams in sequence; A plurality of fixed pulleys are installed along the through beam; A movable pulley is provided below the space between adjacent fixed pulleys; A linkage steel cable alternately passes around each of the fixed pulleys and each of the movable pulleys from one end to the other end in the longitudinal direction, and both ends of the linkage steel cable are connected to a retractable cable extending from an electric winch installed on the corresponding bottom surface; The supporting steel cables have multiple ends, one end of which is connected to a corresponding movable pulley and the other end is connected to the top plate steel bars below. The supporting steel cables pull down each fixed pulley to make the linkage steel cables wavy in the longitudinal direction. When the two electric winches synchronously reel in the corresponding cables, the two ends of the linkage steel cables are synchronously pulled, and the linkage steel cables synchronously pull upward each fixed pulley, and each supporting steel cable synchronously lifts the top plate steel bars.

5. According to claim 1, the large immersed tube full-section prefabricated lightweight formwork system is characterized in that: A walking-type traveling mechanism is installed at the bottom of the outer truss, and the walking-type traveling mechanism includes a longitudinal moving component and a jacking component; The longitudinal movement assembly includes a longitudinal movement guide rail, a longitudinal movement support frame and a longitudinal movement oil cylinder. The longitudinal movement guide rail is longitudinally placed on the ground, the longitudinal movement support frame is slidably installed on the longitudinal movement guide rail, and the longitudinal movement oil cylinder is installed on the longitudinal movement guide rail and pushes and pulls the longitudinal movement support frame to slide; The jacking assembly comprises a jacking support frame and a jacking cylinder. The jacking support frame is installed on the outer truss, and the jacking cylinder is installed on the longitudinal support frame, and pushes and pulls the jacking support frame to perform lifting.

6. According to claim 5, the large immersed tube full-section prefabricated lightweight formwork system is characterized in that: The walking travel mechanism further includes a transverse movement assembly, the transverse movement assembly includes a transverse movement support frame and a transverse movement oil cylinder, the longitudinal movement support frame is laterally provided with a transverse movement guide rail, the transverse movement support frame is slidably mounted on the transverse movement guide rail, the transverse movement oil cylinder is installed on the transverse movement guide rail, and pushes and pulls the transverse movement support frame to slide; The top of the outer truss is equipped with a mold opening and closing guide rail and a mold opening and closing cylinder. The mold opening and closing guide rail is arranged horizontally and is slidably installed with a mold opening and closing movable seat. The mold opening and closing movable seat is hinged with an open and closing mold support seat. The open and closing mold support seat is fixedly installed on the end of the top truss, and the mold opening and closing cylinder is connected to the open and closing mold movable seat.

7. According to claim 1, the large immersed tube full-section prefabricated lightweight formwork system is characterized by: The inner support rod assembly further includes a plurality of first inner reinforcement rods, and the first inner reinforcement rods are installed between the inner top plate portion, the inner upper chamfered portion and the inner side plate portion and the third inner support link, and the first inner reinforcement rods are fixed to the same point on the third inner support link.

8. The large immersed tube full-section prefabricated lightweight formwork system according to claim 7 is characterized in that: The inner support rod assembly further includes a second inner reinforcement link, wherein three second inner reinforcement links are connected in series, wherein the first second inner reinforcement link is connected to the inner side plate portion, and the third second inner reinforcement link is connected to the bottom of the inner mold body, and the second inner telescopic cylinder is connected to the bottom of the inner mold body by connecting the second second inner reinforcement link and the third second inner reinforcement link; When the three inner supporting connecting rods are in the same straight line, the three second inner reinforcing connecting rods are in the same horizontal straight line.

9. The large immersed tube full-section prefabricated lightweight formwork system according to claim 1 is characterized in that: When the three inner supporting connecting rods are in the same straight line, the first inner telescopic oil cylinder is parallel to the second inner telescopic oil cylinder.

10. The large immersed tube full-section prefabricated lightweight formwork system according to claim 1, characterized in that: The inner mold fixing frame includes a bottom beam and two waist beams respectively fixedly connected to the two ends of the bottom beam, and the top ends of the two waist beams are connected so that the inner mold fixing frame has a triangular structure; The inner mold stand further comprises a bearing support mechanism, on the bearing support frame arranged at the top of the bearing support mechanism, two lifting cylinders are vertically installed, and the two ends of the bottom beam are respectively installed on the two lifting cylinders; The inner mold fixing frame further includes two inner mold supporting seats, which are respectively located on both sides and are fixedly connected to the bottom beam and a corresponding waist beam; When the lifting cylinder lifts the inner mold fixing frame to a height position corresponding to the prefabricated state, the load-bearing support frames all fall onto the corresponding detachably installed unloading blocks on the load-bearing support frames.

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