Bridge variable cross-section formwork system

Abstract

The embodiment of the invention provides a bridge variable cross-section formwork system, and relates to the technical field of bridge construction. The bridge variable cross-section formwork system comprises an outer formwork, an inner formwork, a linear section truss, a graded adjusting truss, an arc section truss and a plurality of first adjusting supporting rods. The inner formwork comprises a linear section inner formwork, a supplementary section inner formwork and an arc section inner formwork which are sequentially connected. The linear section truss is connected with the linear section inner template, and the arc section truss is spaced from the arc section inner template; one end of each first adjusting support rod is in sliding fit with the arc-section truss, and the other end is hinged to the arc-section inner template; the two ends of the graded adjusting truss are detachably connected with the linear section truss and the arc section truss correspondingly, and the graded adjusting truss is used for adjusting the distance between the linear section truss and the arc section truss so that the radius of the arc section inner formwork can be increased or decreased. The formwork can adapt to construction of pier columns with different section sizes, the universality and the repeated utilization rate of the formwork are improved, material waste is reduced, the construction cost is reduced, and the construction safety and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and more particularly, to a variable cross-section formwork system for bridges. Background Art

[0002] During the construction of high piers in bridge engineering, the formwork construction technology for variable cross-section piers mainly adopts a fixed-type steel formwork system. This system is usually customized in a 1:1 ratio according to the designed height of the pier column, so that the total height of the formwork is consistent with the pouring height of the pier column.

[0003] However, this traditional construction method has significant technical limitations: First, since the fixed-type steel formwork is completely customized according to a specific pier column height and the total height of the formwork is the same as the pouring height of the pier column, after each layer of formwork completes the pouring of the corresponding section, it cannot meet the construction requirements of other sections or pier columns with different sizes, resulting in a large amount of formwork materials being idle and resource waste. Second, after each section of the pier column is poured, the replacement operation of the arc formwork is required. However, the steel formwork itself is heavy, and there are significant safety hazards during the hoisting process. Moreover, the frequent formwork hoisting operations also increase the workload of the tower crane and the working intensity of on-site construction personnel. Summary of the Invention

[0004] The purpose of the present invention is to provide a variable cross-section formwork system for bridges, which can adapt to the construction of pier columns with different cross-section sizes, can be reused between different cross-sections of the same pier column and between different pier columns, improves the versatility and reuse rate of the formwork, reduces material waste, reduces construction costs, and improves construction safety and construction efficiency.

[0005] Embodiments of the present invention are implemented as follows:

[0006] An embodiment of the present invention provides a variable cross-section formwork system for bridges, including:

[0007] An outer formwork;

[0008] An inner formwork, the inner formwork is arranged at an interval from the outer formwork, and the inner formwork includes a straight-section inner formwork, a supplementary-section inner formwork, and an arc-section inner formwork that are connected in sequence;

[0009] A straight-section truss, the straight-section truss is fixedly connected to the straight-section inner formwork and is located on the side of the straight-section inner formwork away from the outer formwork;

[0010] An arc-section truss, the arc-section truss is arranged at an interval from the arc-section inner formwork and is located on the side of the straight-section inner formwork away from the outer formwork;

[0011] A plurality of first adjusting support rods, one ends of the plurality of first adjusting support rods are in sliding fit with the arc-section truss, and the other ends are hinged to the arc-section inner formwork; and

[0012] A stepped adjustment truss, the two ends of the stepped adjustment truss are respectively detachably connected to the straight-section truss and the arc-section truss, and are used to adjust the distance between the straight-section truss and the arc-section truss, so as to increase or decrease the radius of the inner formwork of the arc section.

[0013] In an alternative embodiment, the straight-section truss is provided with a plurality of first stepped adjustment holes, the plurality of first stepped adjustment holes are arranged at intervals, the arc-section truss is provided with a plurality of second stepped adjustment holes, and the plurality of second stepped adjustment holes are arranged at intervals;

[0014] Both ends of the stepped adjustment truss are respectively provided with a first pin shaft and a second pin shaft. The first pin shaft is used to cooperate with the first stepped adjustment hole to connect and fix the stepped adjustment truss to the straight-section truss; the second pin shaft is used to cooperate with the second stepped adjustment hole to connect and fix the stepped adjustment truss to the arc-section truss.

[0015] In an alternative embodiment, the arc-section truss is provided with a first sliding groove, and one end of the first adjustment support rod is provided with a third pin shaft, and the third pin shaft is slidably matched with the first sliding groove.

[0016] In an alternative embodiment, the bridge variable cross-section formwork system further includes an inner formwork fine-tuning mechanism, the inner formwork fine-tuning mechanism is arranged on the arc-section truss, and is used to drive the third pin shaft to slide in the first sliding groove.

[0017] In an alternative embodiment, the inner formwork fine-tuning mechanism includes a telescopic sleeve, a screw rod, a pressing head and a first rotating operating rod. The telescopic sleeve is sleeved on the screw rod and is threadedly connected to the screw rod. The pressing head is arranged on the screw rod and is used to press the third pin shaft. The first rotating operating rod is arranged on the telescopic sleeve;

[0018] Wherein, the first rotating operating rod is used to drive the telescopic sleeve to rotate under the action of an external force, so that the screw rod moves relative to the telescopic sleeve, so that the pressing head pushes the third pin shaft to slide in the first sliding groove.

[0019] In an alternative embodiment, the bridge variable cross-section formwork system further includes an adjustable restraint steel belt, and the adjustable restraint steel belt is wound around the outside of the outer formwork;

[0020] The adjustable restraint steel belt includes a plurality of steel belt sections and a plurality of steel belt connectors. The plurality of steel belt sections are arranged at intervals along the circumferential direction of the outer formwork, and adjacent two steel belt sections are detachably connected through the steel belt connectors.

[0021] In an optional embodiment, installation cavities are provided at both ends of the steel belt section, and the steel belt connector includes two connecting pins and two connecting buckles, and the two connecting pins are respectively inserted into the installation cavities of two adjacent steel belt sections, one of the connecting buckles is simultaneously engaged with one end of the two connecting pins, and the other connecting buckle is simultaneously engaged with the other end of the two connecting pins.

[0022] In an optional embodiment, the outer template includes a straight segment outer template, a supplementary segment outer template and an arc segment outer template connected in sequence, the straight segment outer template is arranged opposite to the straight segment inner template, the supplementary segment outer template is arranged opposite to the supplementary segment inner template, and the arc segment outer template is arranged opposite to the arc segment inner template;

[0023] The bridge variable-section formwork system also includes an outer mold ratchet adjuster, which is fixed to the straight segment outer mold and is used to adjust the tightness between the multiple steel belt sections.

[0024] In an optional embodiment, two of the steel belt sections located at the outer template of the straight segment are provided with a first toothed portion and a second toothed portion on the sides away from each other respectively;

[0025] The outer mold ratchet adjuster includes two gear assemblies and an adjustment assembly. The two gear assemblies are arranged at intervals and respectively cooperate with the first toothed portion and the second toothed portion; the adjustment assembly is used to drive one of the gear assemblies to rotate to drive the two steel belt sections to move in opposite directions.

[0026] In an optional embodiment, the bridge variable section formwork system further includes at least one second adjustment support rod, one end of which is slidably matched with the step-by-step adjustment truss, and the other end of which is hinged to the supplementary section inner formwork; and / or,

[0027] The bridge variable-section formwork system further includes a plurality of inner mold stiffening ribs, which are fixedly arranged on a side of the inner formwork away from the outer formwork and spaced apart along the circumference of the inner formwork, the straight segment truss is fixedly connected to the plurality of inner mold stiffening ribs, and the first adjustment support rod is hinged to the inner mold stiffening ribs; and / or,

[0028] The bridge variable-section formwork system further comprises a plurality of outer formwork stiffening ribs, wherein the plurality of outer formwork stiffening ribs are fixedly arranged on a side of the outer formwork away from the inner formwork and are arranged at intervals along the circumference of the outer formwork; and / or,

[0029] The bridge variable-section formwork system also includes a shaped inner support steel ring, which is arranged on the top of the outer formwork and is located on a side of the outer formwork close to the inner formwork.

[0030] The beneficial effects of the embodiments of the present invention include:

[0031] Through this bridge variable cross-section formwork system, during the construction of bridge piers, when adjusting the cross-sectional radius of the pier, first disassemble the two ends of the stepped adjustment truss from the straight-section truss and the arc-section truss, and then move the arc-section truss to adjust the distance from the straight-section truss; during this process, one end of the first adjustment support rod can slide on the arc-section truss, and the other end rotates relative to the inner formwork of the arc section, so that the inner formwork of the arc section can be expanded or contracted to achieve the adjustment of the diameter change of expansion and contraction. Since the lengths of the inner formwork of the arc section and the inner formwork of the straight section remain unchanged, during the process of adjusting the radius size, there will be a gap between the inner formwork of the arc section and the inner formwork of the straight section, and this gap is compensated by the supplementary-section outer formwork. When specifically manufacturing the inner formwork of the supplementary section, its length can be directly set to the length of the inner formwork of the supplementary section corresponding to the radius of the inner formwork of the arc section when the cross-sectional radius of the bridge pier is the largest, so as to ensure that when adjusting the radii of different inner formworks of the arc section, the inner formwork of the arc section can be connected and fixed to the inner formwork of the straight section through the inner formwork of the supplementary section, and the stability of the inner formwork and the outer formwork during the pouring process can be achieved.

[0032] That is to say, when constructing different cross-sections of the bridge pier, the same set of straight-section inner formwork, supplementary-section inner formwork, and arc-section inner formwork can be used, so that when the overall size of the inner formwork is determined, the outer formwork can also be adjusted accordingly. It is easy to understand that this setting can adapt to the construction of piers with different cross-sectional sizes, can be reused between different cross-sections of the same pier and different piers, without replacing the arc formwork, simplifies the formwork manufacturing process, can complete the corresponding construction with fewer parts, thereby improving the versatility and reuse rate of the formwork, reducing material waste, reducing construction costs, and improving construction safety and construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of the bridge variable cross-section formwork system provided by the embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of a partial structure of the bridge variable cross-section formwork system provided by the embodiment of the present invention in an expanded state;

[0036] Figure 3 Schematic diagram of a part of the bridge variable cross-section formwork system provided by an embodiment of the present invention in a contracted state;

[0037] Figure 4 Schematic diagram of the structure of the internal formwork fine-tuning mechanism provided by an embodiment of the present invention;

[0038] Figure 5 Schematic diagram of the structure of the adjustable restraint steel strip provided by an embodiment of the present invention;

[0039] Figure 6 Schematic diagram of the structure of the external formwork ratchet regulator provided by an embodiment of the present invention.

[0040] Icons: 100 - bridge variable cross-section formwork system; 10 - external formwork; 11 - straight-section external formwork; 12 - supplementary-section external formwork; 13 - arc-section external formwork; 20 - internal formwork; 21 - straight-section internal formwork; 22 - supplementary-section internal formwork; 23 - arc-section internal formwork; 31 - straight-section truss; 311 - first hierarchical adjustment hole; 32 - hierarchical adjustment truss; 321 - first pin shaft; 322 - second pin shaft; 323 - second chute; 33 - arc-section truss; 331 - second hierarchical adjustment hole; 332 - first chute; 41 - first adjustment support rod; 411 - third pin shaft; 42 - second adjustment support rod; 421 - fourth pin shaft; 50 - internal formwork fine-tuning mechanism; 51 - telescopic sleeve; 52 - screw rod; 53 - pressing head; 54 - first rotary operating rod; 60 - adjustable restraint steel strip; 61 - steel strip section; 611 - installation cavity; 612 - first tooth pattern part; 613 - second tooth pattern part; 62 - steel strip connector; 621 - connecting pin shaft; 622 - connecting buckle; 623 - end buckle; 70 - external formwork ratchet regulator; 71 - gear assembly; 711 - anti-reverse gear; 712 - driving gear; 72 - adjustment assembly; 721 - rotating shaft; 722 - second rotary operating rod; 723 - driving pawl; 724 - anti-reverse pawl; 725 - first elastic member; 726 - second elastic member; 81 - internal formwork stiffening rib; 82 - external formwork stiffening rib; 83 - shaped internal support steel ring. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0042] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0043] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0044] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0046] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] As described in the background art, this traditional formwork construction method for variable cross-section pier columns has technical limitations: First, since the total height of the formwork is the same as the pouring height of the pier column, after each layer of formwork completes the pouring of the corresponding section, it cannot meet the construction requirements of other sections or pier columns of different sizes, resulting in a large amount of idle formwork materials and waste of resources. Second, after each section of the pier column is poured, the replacement operation of the arc formwork is required. However, the steel formwork itself is heavy, and there are significant safety hazards during the hoisting process. Moreover, the frequent formwork hoisting operations also increase the workload of the tower crane and the working intensity of on-site construction personnel.

[0048] Based on this, please refer to Figures 1-6 , an embodiment of the present invention provides a bridge variable cross-section formwork system 100, which can effectively improve the above-mentioned technical problems. It can adapt to the construction of pier columns with different cross-section sizes, can be reused between different cross-sections of the same pier column and different pier columns, improves the versatility and reuse rate of the formwork, reduces material waste, reduces construction costs, and improves construction safety and construction efficiency. The bridge variable cross-section formwork system 100 will be described in detail below.

[0049] Please refer to Figures 1-3 , Figure 1 is a schematic structural diagram of the bridge variable cross-section formwork system 100 provided in this embodiment, Figure 2 is a schematic diagram of a partial structure of the bridge variable cross-section formwork system 100 provided in this embodiment in an expanded state, Figure 3 is a schematic diagram of a partial structure of the bridge variable cross-section formwork system 100 provided in this embodiment in a contracted state.

[0050] Combined with Figures 1-3 , the bridge variable cross-section formwork system 100 includes an outer formwork 10, an inner formwork 20, a straight-section truss 31, a hierarchical adjustment truss 32, an arc-section truss 33, and a plurality of first adjustment support rods 41. The inner formwork 20 is arranged at an interval from the outer formwork 10, and the inner formwork 20 includes a straight-section inner formwork 21, a supplementary-section inner formwork 22, and an arc-section inner formwork 23 connected in sequence. The straight-section truss 31 is fixedly connected to the straight-section inner formwork 21 and is located on the side of the straight-section inner formwork 21 away from the outer formwork 10; the arc-section truss 33 is arranged at an interval from the arc-section inner formwork 23 and is located on the side of the straight-section inner formwork 21 away from the outer formwork 10. One end of each of the plurality of first adjustment support rods 41 is in sliding fit with the arc-section truss 33, and the other end is hinged to the arc-section inner formwork 23. The two ends of the hierarchical adjustment truss 32 are respectively detachably connected to the straight-section truss 31 and the arc-section truss 33, and are used to adjust the distance between the straight-section truss 31 and the arc-section truss 33 to increase or decrease the radius of the arc-section inner formwork 23.

[0051] When it is necessary to adjust the cross-sectional radius of the pier column during the construction process, first disassemble the two ends of the stepped adjustment truss 32 from the straight-section truss 31 and the arc-section truss 33 respectively, and then move the arc-section truss 33 to adjust the distance from the straight-section truss 31. During this process, one end of the first adjustment support rod can slide on the arc-section truss 33, and the other end rotates relative to the inner formwork 23 of the arc section, so that the inner formwork 23 of the arc section can be expanded or contracted to achieve the adjustment of the diameter change by expansion and contraction. Since the lengths of the inner formwork 23 of the arc section and the inner formwork 21 of the straight section remain unchanged, during the process of adjusting the radius size, there will be a gap between the inner formwork 23 of the arc section and the inner formwork 21 of the straight section, and this gap is compensated by the supplementary-section outer formwork 12. When specifically manufacturing the supplementary-section inner formwork 22, its length can be directly set to the length of the supplementary-section inner formwork 22 required corresponding to the radius of the inner formwork 23 of the arc section when the cross-sectional radius of the bridge pier column is the largest, so as to ensure that when adjusting the radius of the inner formwork 23 of different arc sections, the inner formwork 23 of the arc section can be fixedly connected to the inner formwork 21 of the straight section through the supplementary-section inner formwork 22, and the stability of the inner formwork 20 and the outer formwork 10 during the pouring process can be realized.

[0052] That is to say, when constructing different cross-sections of the bridge pier column, the same set of straight-section inner formwork 21, supplementary-section inner formwork 22 and arc-section inner formwork 23 can be used, so that when the overall size of the inner formwork 20 is determined, the outer formwork 10 can also be adjusted accordingly. It can be understood that this setting can adapt to the construction of pier columns with different cross-sectional sizes, without replacing the arc formwork, and can be reused between different cross-sections of the same pier column and different pier columns, which simplifies the manufacturing process of the formwork, can complete the corresponding construction with fewer parts, thereby improving the versatility and reuse rate of the formwork, reducing material waste, lowering the construction cost, and improving the construction safety and construction efficiency.

[0053] It should be noted that in this embodiment, the number of the straight-section inner formwork 21 and the arc-section inner formwork 23 is two each, and the number of the supplementary-section inner formwork 22 is four. The two straight-section inner formworks 21 and the two arc-section inner formworks 23 are arranged alternately and at intervals along the circumference of the inner formwork 20, and the adjacent straight-section inner formwork 21 and arc-section inner formwork 23 are connected by the supplementary-section inner formwork 22.

[0054] Correspondingly, the number of the straight-section truss 31 and the arc-section truss 33 is two each, and the number of the stepped adjustment truss 32 is four. The two straight-section trusses 31 are respectively fixedly connected to the two straight-section inner formworks 21, the two arc-section trusses 33 are respectively arranged at intervals with the two arc-section inner formworks 23, and the adjacent straight-section truss 31 and arc-section truss 33 are detachably connected to a stepped adjustment truss 32.

[0055] Through the above-mentioned quantity setting in this embodiment, the shape of the formed inner template 20 can be made similar to an oval, so as to better adapt to the peripheral shape of the bridge pier, and it is also convenient to cooperate with the outer template 10 for better subsequent pouring.

[0056] That is to say, correspondingly, in this embodiment, the outer template 10 also includes a straight-section outer template 11, a supplementary-section outer template 12, and an arc-section outer template 13 that are connected in sequence. The straight-section outer template 11 is arranged opposite to the straight-section inner template 21, the supplementary-section outer template 12 is arranged opposite to the supplementary-section inner template 22, and the arc-section outer template 13 is arranged opposite to the arc-section inner template 23. Similarly, the number of both the straight-section outer template 11 and the arc-section outer template 13 is two, and the number of the supplementary-section outer template 12 is four. The two straight-section outer templates 11 and the two arc-section outer templates 13 are alternately arranged at intervals along the circumference of the outer template 10, and the adjacent straight-section outer template 11 and arc-section outer template 13 are connected by the supplementary-section outer template 12.

[0057] Combined Figure 2 with Figure 3 , specifically, the straight-section truss 31 is provided with a plurality of first hierarchical adjustment holes 311, and the plurality of first hierarchical adjustment holes 311 are arranged at intervals. The arc-section truss 33 is provided with a plurality of second hierarchical adjustment holes 331, and the plurality of second hierarchical adjustment holes 331 are arranged at intervals. Both ends of the hierarchical adjustment truss 32 are respectively provided with a first pin shaft 321 and a second pin shaft 322. The first pin shaft 321 is used to cooperate with the first hierarchical adjustment hole 311 to connect and fix the hierarchical adjustment truss 32 and the straight-section truss 31; the second pin shaft 322 is used to cooperate with the second hierarchical adjustment hole 331 to connect and fix the hierarchical adjustment truss 32 and the arc-section truss 33.

[0058] That is to say, when it is necessary to adjust the distance between the straight-section truss 31 and the arc-section truss 33, first take out the first pin shaft 321 from one of the first hierarchical adjustment holes 311, and / or take out the second pin shaft 322 from one of the second hierarchical adjustment holes 331, and then operate the arc-section truss 33 to move relative to the straight-section truss 31. Under the action of the plurality of first adjustment support rods 41, the radius of the arc-section inner template 23 is increased or decreased; when adjusted to an appropriate size, then install the first pin shaft 321 in another first hierarchical adjustment hole 311 for fixation, and / or install the second pin shaft 322 in another second hierarchical adjustment hole 331 for fixation. This adjustment method is convenient and fast to operate and can improve the construction efficiency.

[0059] It should be noted that both of the two straight-section trusses 31 have two groups of first hierarchical adjustment holes 311, and each group includes a plurality of first hierarchical adjustment holes 311; of course, both of the two arc-section trusses 33 have two groups of second hierarchical adjustment holes 331, and each group includes a plurality of second hierarchical adjustment holes 331. AsFigure 2 As shown, the schematic diagram can be understood as a schematic diagram of the bridge variable-section formwork system 100 in the maximum expansion state, at which time the first pins 321 of the four graded adjustment trusses 32 are all installed in the first graded adjustment holes 311 located at one end of each group, and the second pins 322 are all installed in the second graded adjustment holes 331 located at one end of each group, thereby achieving the maximum expansion size of the inner formwork 20, that is, in this state, the two straight segment trusses 31, the two arc segment trusses 33 and the four graded adjustment trusses 32 form an octagonal structure.

[0060] for Figure 3 For example, the schematic diagram can be understood as a schematic diagram of the bridge variable-section formwork system 100 in the minimum contraction state, at which time the first pins 321 of the four graded adjustment trusses 32 are all installed in the first graded adjustment holes 311 located at the other end of each group, and the second pins 322 are all installed in the second graded adjustment holes 331 located at the other end of each group, thereby achieving the minimum contraction size of the inner formwork 20, that is, in this state, the two straight-segment trusses 31 and the two arc-segment trusses 33 form a quadrilateral structure, and the four graded adjustment trusses 32 are located inside the quadrilateral structure.

[0061] Please continue to combine Figure 2 and Figure 3 Specifically, the arc segment truss 33 is provided with a first slide groove 332, and one end of the first adjustment support rod 41 is provided with a third pin shaft 411, and the third pin shaft 411 is slidably matched with the first slide groove 332. It is easy to understand that the third pin shaft 411 slides in the first slide groove 332, so that the other end of the first adjustment support rod 41 can rotate relative to the arc segment inner template 23, thereby pushing the arc segment inner template 23 to expand to increase its radius, or pulling the arc segment inner template 23 to shrink to reduce its radius. The adjustment is convenient and quick, and the construction efficiency can be improved.

[0062] In order to facilitate the adjustment of the position of the third pin shaft 411 in the first slide groove 332 and better fix it to improve the supporting stability of the inner formwork 20, in this embodiment, the bridge variable-section formwork system 100 also includes an inner mold fine-tuning mechanism 50, which is arranged on the arc segment truss 33 and is used to drive the third pin shaft 411 to slide in the first slide groove 332.

[0063] Specifically, please refer to Figure 4 , Figure 4 The schematic diagram of the structure of the inner mold fine-tuning mechanism 50 provided in this embodiment, combined with Figures 2-4, the inner mold fine-tuning mechanism 50 includes a telescopic sleeve 51, a screw rod 52, a pressing head 53, and a first rotating operating rod 54. The telescopic sleeve 51 is sleeved on the screw rod 52 and is threadedly connected to the screw rod 52. The pressing head 53 is arranged on the screw rod 52 and is used to press the third pin shaft 411. The first rotating operating rod 54 is arranged on the telescopic sleeve 51. The first rotating operating rod 54 is used to drive the telescopic sleeve 51 to rotate under the action of an external force, so that the screw rod 52 moves relative to the telescopic sleeve 51, causing the pressing head 53 to push the third pin shaft 411 to slide in the first chute 332.

[0064] It should be noted that, in this embodiment, the pressing head 53 is provided with an arc-shaped groove, which can better fit the outer side wall of the third pin shaft 411 to improve the stability during the pushing process and better perform abutting and fixing after pushing, so as to improve the installation stability of the first adjusting support rod 41.

[0065] Furthermore, the number of the pressing heads 53 in this embodiment is two, and the two pressing heads 53 are respectively arranged at both ends of the screw rod 52. Combining Figure 2 and Figure 3 , it can be understood that the inner mold fine-tuning mechanism 50 is arranged between adjacent two third pin shafts 411, that is, the two pressing heads 53 respectively abut against the third pin shafts 411 of the adjacent two first adjusting support rods 41. In this way, when operating multiple inner mold fine-tuning mechanisms 50, the first rotating operating rod 54 can be rotated in sequence, so that the pressing heads 53 at both ends of the screw rod 52 can move in sequence, thereby sequentially pushing multiple third pin shafts 411 to move in the same direction in the first chute 332. And after the adjustment is completed, it can also be ensured that each third pin shaft 411 abuts against the corresponding pressing head 53, thereby realizing the fixation of multiple first adjusting support rods 41 in the first chute 332.

[0066] Please continue to combine Figure 2 , it should be noted that, during the expansion process of the bridge variable cross-section formwork system 100, in order to improve the installation stability of the inner formwork 22 in the supplementary section and adapt to the retraction and diameter change operation of the inner formwork 23 in the arc section. In this embodiment, the bridge variable cross-section formwork system 100 further includes at least one second adjusting support rod 42. One end of the second adjusting support rod 42 is slidably matched with the hierarchical adjusting truss 32, and the other end is hinged to the inner formwork 22 in the supplementary section.

[0067] In this embodiment, the number of the second adjusting support rods 42 is four, which are respectively matched with four inner formworks 22 in the supplementary section and four hierarchical adjusting trusses 32. Of course, in other embodiments, the number of the second adjusting support rods 42 can also be one, two, three, five, etc. That is to say, one or more second adjusting support rods 42 can be arranged between each inner formwork 22 in the supplementary section and each hierarchical adjusting truss 32.

[0068] Furthermore, the stepped adjustment truss 32 is provided with a second sliding groove 323. One end of the second adjusting support rod 42 is provided with a fourth pin shaft 421, and the fourth pin shaft 421 is in sliding fit with the second sliding groove 323, so as to conveniently and quickly adjust the retraction and diameter change operation of the inner formwork 22 in the supplementary section.

[0069] Similarly, in order to facilitate the adjustment of the position of the fourth pin shaft 421 in the second sliding groove 323 and better fix it to improve the support stability of the inner formwork 20, in this embodiment, an inner formwork fine-tuning mechanism 50 is also provided on each stepped adjustment truss 32. The cooperation mode of the inner formwork fine-tuning mechanism 50 with the fourth pin shaft 421 can refer to the cooperation mode of the inner formwork fine-tuning mechanism 50 with the third pin shaft 411, which will not be elaborated in this embodiment.

[0070] Please continue to refer to Figure 1 In order to better adjust and fix the outer formwork 10, in this embodiment, the bridge variable cross-section formwork system 100 further includes an adjustable restraint steel belt 60, and the adjustable restraint steel belt 60 is wound around the outer side of the outer formwork 10.

[0071] It should be noted that the number of the adjustable restraint steel belts 60 can be multiple. The multiple adjustable restraint steel belts 60 are arranged at intervals along the height direction of the outer formwork 10, and the specific number of the adjustable restraint steel belts 60 can be determined according to the height of the casting layer. For example, there are five adjustable restraint steel belts 60 in this embodiment. Of course, in other embodiments, the number can also be one, two, three, four, etc.

[0072] Specifically, please refer to Figure 5 Figure 5 which is a schematic structural diagram of the adjustable restraint steel belt 60 provided in this embodiment. Combining Figure 1 and Figure 5 the adjustable restraint steel belt 60 includes a plurality of steel belt sections 61 and a plurality of steel belt connectors 62. The plurality of steel belt sections 61 are arranged at intervals along the circumferential direction of the outer formwork 10, and adjacent two steel belt sections 61 are detachably connected through the steel belt connectors 62. Through such a setting, it is possible to conveniently disassemble and install the steel belt sections 61, so as to adapt to the size of the outer formwork 10 to adapt to the perimeter change of different pier sizes, improving the construction efficiency; and the steel belt sections 61 and the steel belt connectors 62 are universal, which can further improve the universality and reuse rate, reduce material waste, and reduce the construction cost.

[0073] Furthermore, both ends of the steel belt section 61 are provided with a mounting cavity 611, and the steel belt connector 62 includes two connecting pins 621 and two connecting buckles 622. The two connecting pins 621 are respectively inserted into the mounting cavities 611 of two adjacent steel belt sections 61, and one connecting buckle 622 is simultaneously engaged with one end of the two connecting pins 621, and the other connecting buckle 622 is simultaneously engaged with the other end of the two connecting pins 621. It is easy to understand that through the cooperation of the mounting cavity 611, the connecting buckle 622 and the connecting pin 621, the disassembly and assembly operation of multiple steel belt sections 61 can be quickly realized; and the steel belt section 61 can also be rotated by the connecting pin 621 to better adapt to the arc transition of the outer template 10, and at the same time, it is convenient to adjust the tightness of multiple steel belt sections 61 to improve the locking effect of the outer template 10.

[0074] It should be noted that, in this embodiment, both opposite ends of the steel belt segment 61 are bent inward to form a mounting cavity 611, and the steel belt connector 62 further includes an end buckle 623, which is used to clamp and fix the end of the steel belt segment 61. Of course, in order to improve the connection stability of the end of the steel belt segment 61, the end can also be further welded and fixed to the middle position of the steel belt.

[0075] Furthermore, in order to facilitate the adjustment of the tightness between the steel belt sections 61 to improve the overall stability of the outer formwork 10, in the present embodiment, the bridge variable-section formwork system 100 also includes an outer formwork ratchet adjuster 70, which is fixed to the straight segment outer formwork 11 and is used to adjust the tightness between multiple steel belt sections 61.

[0076] Specifically, please refer to Figure 6 , Figure 6 The schematic diagram of the structure of the outer mold ratchet adjuster 70 provided in this embodiment, combined with Figure 5 and Figure 6 , two of the steel belt sections 61 located at the straight segment outer template 11 are provided with a first toothed portion 612 and a second toothed portion 613 on the side away from each other. The outer mold ratchet adjuster 70 includes two gear assemblies 71 and an adjustment assembly 72. The two gear assemblies 71 are arranged at intervals and cooperate with the first toothed portion 612 and the second toothed portion 613 respectively; the adjustment assembly 72 is used to drive one of the gear assemblies 71 to rotate, so as to drive the two steel belt sections 61 to move in opposite directions, so as to tighten the entire steel belt, so as to achieve the purpose of tightening the outer template 10 and ensure stability during the subsequent pouring process.

[0077] Further, the gear assembly 71 includes a reverse-prevention gear 711 and a transmission gear 712. The transmission gear 712 is sleeved on the reverse-prevention gear 711. The first tooth thread portion 612 meshes with the transmission gear 712 of one of the gear assemblies 71, and the second tooth thread portion 613 meshes with the transmission gear 712 of the other gear assembly 71. The adjusting assembly 72 includes a rotating shaft 721, a second rotating operating rod 722, a driving pawl 723, a reverse-prevention pawl 724, a first elastic member 725, and a second elastic member 726. The second rotating operating rod 722, the driving pawl 723, and the reverse-prevention pawl 724 are all arranged on the rotating shaft 721. The driving pawl 723 and the reverse-prevention pawl 724 are arranged at intervals and both mesh with the reverse-prevention gear 711. Two ends of the first elastic member 725 are respectively connected to the rotating shaft 721 and the driving pawl 723, and two ends of the second elastic member 726 are respectively connected to the rotating shaft 721 and the reverse-prevention pawl 724.

[0078] It is easy to understand that during the tightening operation, the second rotating operating rod 722 can be rotated, and the driving pawl 723 drives the reverse-prevention gear 711 and the transmission gear 712 to rotate in sequence, so that the two steel belt joints 61 move in opposite directions respectively, so as to realize the tightening effect on the overall steel belt. Since the installation angles of the driving pawl 723 and the reverse-prevention pawl 724 with respect to the reverse-prevention gear 711 are different, under the action of the first elastic member 725, it can be ensured that when the second rotating operating rod 722 is rotated, the driving pawl 723 can mesh with the reverse-prevention gear 711, and when the second rotating operating rod 722 is rotated in the reverse direction, the driving pawl 723 can disengage from the reverse-prevention gear 711, thus facilitating the repeated rotation operation of the operating rod. For the second elastic member 726, it can ensure that the reverse-prevention pawl 724 always presses on the reverse-prevention gear 711, and the reverse-prevention gear 711 can only rotate in one direction, so as to realize its reverse-prevention function and ensure that the overall steel belt will not reset and loosen after being tightened.

[0079] It should be noted that in this embodiment, the number of the reverse-prevention pawl 724 and the second elastic member 726 is two. The two reverse-prevention pawls 724 are respectively located at both ends of the reverse-prevention gear 711, and the driving pawl 723 is located between the two reverse-prevention pawls 724, so as to better realize the reverse-prevention function, improve the tightening effect of the steel belt, and further ensure the quality of the subsequent cast concrete. Of course, in other embodiments, the number of the reverse-prevention pawl 724 and the second elastic member 726 can also be one, three, four, etc.

[0080] In addition, it should also be noted that the first elastic member 725 and the second elastic member 726 in this embodiment are both reset shrapnel. Of course, in other embodiments, they can also be other elastic structures such as reset springs or elastic rubber sleeves.

[0081] Please continue to combine with Figure 2 and Figure 3 , in order to further improve the overall structural strength and installation stability of the inner formwork 20, the bridge variable cross-section formwork system 100 further includes a plurality of inner formwork stiffeners 81. The plurality of inner formwork stiffeners 81 are fixedly arranged on the side of the inner formwork 20 away from the outer formwork 10 and are arranged at intervals along the circumferential direction of the inner formwork 20. The straight-section truss 31 is fixedly connected to the plurality of inner formwork stiffeners 81, and the first adjusting support rod 41 is hinged to the inner formwork stiffener 81.

[0082] Of course, in this embodiment, the second adjusting support rod 42 is also hinged to the inner formwork stiffener 81. That is to say, by arranging the inner formwork stiffener 81, it can also play the role of facilitating the installation of the straight-section truss 31, the first adjusting support rod 41 and the second adjusting support rod 42, thereby further improving the support stability of the inner formwork 20 to enhance the subsequent pouring quality.

[0083] Please continue to combine with Figure 1 , in order to further improve the overall structural strength and installation stability of the outer formwork 10, the bridge variable cross-section formwork system 100 further includes a plurality of outer formwork stiffeners 82. The plurality of outer formwork stiffeners 82 are fixedly arranged on the side of the outer formwork 10 away from the inner formwork 20 and are arranged at intervals along the circumferential direction of the outer formwork 10.

[0084] It should be noted that, in this embodiment, the outer formwork stiffener 82 is specifically a stiffener formed by a space steel bar truss, which can not only ensure the installation stability but also facilitate the subsequent concrete pouring operation and improve the construction efficiency.

[0085] In addition, in order to avoid the problems of abrasion and uneven force caused by the direct contact between the adjustable restraint steel strip 60 and the outer formwork stiffener 82, a rubber buffer roller can be arranged between the adjustable restraint steel strip 60 and the outer formwork stiffener 82. For this rubber buffer roller, it can adopt the same structure as the connecting pin shaft 621 of the steel strip connector 62, or directly replace it with the connecting pin shaft 621, so as to further improve the versatility and reuse rate, reduce the waste of materials and reduce the construction cost.

[0086] For the variable cross-section construction of the bridge pier column, the variable cross-section height of the pier column needs to be constructed in layers, that is, after using the bridge variable cross-section formwork system 100 to build the overall pouring space and carrying out the corresponding pouring, continue to build on the top of this layer of pier column and adjust the corresponding formwork size.

[0087] Therefore, in order to improve the installation stability between the formwork and the top of the pier column for each layer during construction, in this embodiment, the bridge variable cross-section formwork system 100 further includes a shaped internal support steel ring 83. The shaped internal support steel ring 83 is arranged at the top of the outer formwork 10 and is located on the side of the outer formwork 10 close to the inner formwork 20. It is easy to understand that the shaped internal support steel ring 83 can also play a role in shaping the overall installation of the outer formwork 10 and improving its overall structural stability.

[0088] To facilitate understanding of the installation method of the shaped internal support steel ring 83, the following is an explanation through a specific example: For example, if the overall height of the formwork is 4.8 m and the pouring height is 4.5 m, the variable cross-section height of the pier column can be divided into layers with a height of 4.5 m from the top to the bottom of the pier column, and a shaped internal support steel ring 83 is provided for each layer. The shaped internal support steel ring 83 also includes a variable arc section and a fixed straight section, and the size of the variable arc section is made according to the design dimensions of the top section of the corresponding pouring layer; for the 0.15 m at the lower edge of the formwork, it is close to the already poured pier column, while the 0.15 m at the upper edge of the formwork is close to the shaped internal support steel ring 83 with corresponding dimensions.

[0089] According to the above description, this embodiment also provides an installation method for the bridge variable cross-section formwork system 100, which specifically includes:

[0090] Step S10: According to the actual construction situation, perform BIM (Building Information Modeling) modeling and prepare each component required for the assembly of the bridge variable cross-section formwork system 100.

[0091] Step S20: Install multiple internal formwork stiffeners 81 at intervals in sequence along the circumferential path of the inner formwork 20, then assemble the straight-section truss 31, the stepped adjustment truss 32, and the arc-section truss 33, and connect and fix the straight-section truss 31 to the corresponding internal formwork stiffeners 81.

[0092] Step S30: Install multiple first adjustment support rods 41 and second adjustment support rods 42 onto the internal formwork stiffeners 81, the stepped adjustment truss 32, and the arc-section truss 33 correspondingly.

[0093] Step S40: Assemble the straight-section inner formwork 21, the supplementary-section inner formwork 22, and the arc-section inner formwork 23 to form the overall structure of the inner formwork 20.

[0094] Step S50: Operate the inner formwork fine-tuning mechanism 50 to finely adjust the arc-section inner formwork 23, thereby achieving fine adjustment of the overall dimensions of the inner formwork 20.

[0095] Step S60: Assemble the shaped inner support steel ring 83, and then assemble the straight segment outer template 11, the supplementary segment outer template 12 and the arc segment outer template 13 to form an integral outer template 10 structure.

[0096] Step S70: Assemble the adjustable restraining steel belt 60 and wrap it around the outer side of the outer template 10. Specifically, multiple steel belt sections 61 are sequentially connected and fixed by multiple steel belt connectors 62.

[0097] Step S80 : operating the outer mold ratchet adjuster 70 to fine-tune the size of the outer mold plate 10 .

[0098] Step S90: Remeasure the overall formwork system frame size and make corresponding adjustments.

[0099] Step S100: Installing a plurality of outer mold stiffening ribs 82 at intervals in sequence on the circumferential periphery of the outer mold plate 10 .

[0100] In summary, the embodiment of the present invention provides a bridge variable section formwork system 100, which includes an outer formwork 10, an inner formwork 20, a straight section truss 31, a graded adjustment truss 32, an arc section truss 33, and a plurality of first adjustment support rods 41. The inner formwork 20 is spaced apart from the outer formwork 10, and the inner formwork 20 includes a straight section inner formwork 21, a supplementary section inner formwork 22, and an arc section inner formwork 23 connected in sequence. The straight section truss 31 is fixedly connected to the straight section inner formwork 21, and is located on the side of the straight section inner formwork 21 away from the outer formwork 10; the arc section truss 33 is spaced apart from the arc section inner formwork 23, and is located on the side of the straight section inner formwork 21 away from the outer formwork 10. One end of the plurality of first adjustment support rods 41 is slidably matched with the arc section truss 33, and the other end is hinged to the arc section inner formwork 23. Both ends of the step-by-step adjustment truss 32 are detachably connected to the straight segment truss 31 and the arc segment truss 33 , respectively, for adjusting the distance between the straight segment truss 31 and the arc segment truss 33 to increase or decrease the radius of the arc segment inner template 23 .

[0101] During the construction of bridge piers, when adjusting the cross-sectional radius of the pier, first disassemble the two ends of the stepped adjustment truss 32 from the straight-section truss 31 and the arc-section truss 33 respectively, and then move the arc-section truss 33 to adjust the distance from the straight-section truss 31. During this process, one end of the first adjustment support rod can slide on the arc-section truss 33, and the other end rotates relative to the inner formwork 23 of the arc section, so that the inner formwork 23 of the arc section can be expanded or contracted to achieve the adjustment of diameter change by expansion and contraction. Since the lengths of the inner formwork 23 of the arc section and the inner formwork 21 of the straight section remain unchanged, during the process of adjusting the radius, there will be a gap between the inner formwork 23 of the arc section and the inner formwork 21 of the straight section, and this gap is compensated by the additional-section outer formwork 12. When specifically manufacturing the additional-section inner formwork 22, its length can be directly set to the length of the additional-section inner formwork 22 corresponding to the radius of the inner formwork 23 of the arc section when the cross-sectional radius of the bridge pier is the largest, so as to ensure that when adjusting the radius of the inner formwork 23 of different arc sections, the inner formwork 23 of the arc section can be connected and fixed to the inner formwork 21 of the straight section through the additional-section inner formwork 22, and the stability of the inner formwork 20 and the outer formwork 10 during the pouring process can be achieved.

[0102] That is to say, when constructing different cross-sections of bridge piers, the same set of straight-section inner formwork 21, additional-section inner formwork 22 and arc-section inner formwork 23 can be used, so that when the overall size of the inner formwork 20 is determined, the outer formwork 10 can also be adjusted accordingly. It is easy to understand that this setting can adapt to the construction of piers with different cross-sectional sizes, without replacing the arc formwork, and can be reused between different cross-sections of the same pier and different piers. It simplifies the manufacturing process of the formwork, and the corresponding construction can be completed with fewer parts, thus improving the versatility and reuse rate of the formwork, reducing material waste, lowering the construction cost, and improving the construction safety and construction efficiency.

[0103] The above are only specific embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bridge variable cross-section formwork system, characterized in that: include: External template (10); An inner template (20), the inner template (20) being spaced apart from the outer template (10), and the inner template (20) comprising a straight segment inner template (21), a supplementary segment inner template (22), and an arc segment inner template (23) connected in sequence; A straight segment truss (31), the straight segment truss (31) is fixedly connected to the straight segment inner template (21) and is located on a side of the straight segment inner template (21) away from the outer template (10); A circular arc segment truss (33), wherein the circular arc segment truss (33) is spaced apart from the circular arc segment inner template (23) and is located on a side of the straight segment inner template (21) away from the outer template (10); A plurality of first adjustment support rods (41), one end of each of the plurality of first adjustment support rods (41) being slidably matched with the circular arc segment truss (33), and the other end of each of the plurality of first adjustment support rods (41) being hinged to the circular arc segment inner template (23); as well as A stepped adjustment truss (32), wherein both ends of the stepped adjustment truss (32) are detachably connected to the straight segment truss (31) and the circular arc segment truss (33), respectively, and is used to adjust the distance between the straight segment truss (31) and the circular arc segment truss (33), so as to increase or decrease the radius of the circular arc segment inner template (23).

2. The bridge variable cross-section formwork system according to claim 1, characterized in that: The straight segment truss (31) is provided with a plurality of first graded adjustment holes (311), and the plurality of first graded adjustment holes (311) are arranged at intervals; the arc segment truss (33) is provided with a plurality of second graded adjustment holes (331), and the plurality of second graded adjustment holes (331) are arranged at intervals; A first pin shaft (321) and a second pin shaft (322) are respectively provided at both ends of the step-by-step adjustment truss (32); the first pin shaft (321) is used to cooperate with the first step-by-step adjustment hole (311) to connect and fix the step-by-step adjustment truss (32) to the straight segment truss (31); and the second pin shaft (322) is used to cooperate with the second step-by-step adjustment hole (331) to connect and fix the step-by-step adjustment truss (32) to the circular arc segment truss (33).

3. The bridge variable cross-section formwork system according to claim 1, characterized in that: The arc segment truss (33) is provided with a first sliding groove (332), and one end of the first adjustment support rod (41) is provided with a third pin shaft (411), and the third pin shaft (411) is slidably matched with the first sliding groove (332).

4. The bridge variable cross-section formwork system according to claim 3 is characterized in that: The bridge variable-section formwork system (100) also includes an inner mold fine-tuning mechanism (50), which is arranged on the circular arc segment truss (33) and is used to drive the third pin shaft (411) to slide in the first sliding groove (332).

5. The bridge variable cross-section formwork system according to claim 4, characterized in that: The inner mold fine-tuning mechanism (50) comprises a telescopic sleeve (51), a screw rod (52), a pushing head (53) and a first rotating operating rod (54); the telescopic sleeve (51) is sleeved on the screw rod (52) and is threadedly connected to the screw rod (52); the pushing head (53) is arranged on the screw rod (52) and is used to push the third pin shaft (411); and the first rotating operating rod (54) is arranged on the telescopic sleeve (51); Wherein, the first rotating operating rod (54) is used to drive the telescopic sleeve (51) to rotate under the action of an external force, so that the spiral rod (52) moves relative to the telescopic sleeve (51), so that the pushing head (53) pushes the third pin shaft (411) to slide in the first sliding groove (332).

6. The bridge variable cross-section formwork system according to claim 1, characterized in that: The bridge variable-section formwork system (100) further comprises an adjustable restraining steel belt (60), wherein the adjustable restraining steel belt (60) is wound around the outer side of the outer formwork (10); The adjustable restraining steel belt (60) comprises a plurality of steel belt sections (61) and a plurality of steel belt connectors (62); the plurality of steel belt sections (61) are arranged at intervals along the circumference of the outer template (10), and two adjacent steel belt sections (61) are detachably connected via the steel belt connectors (62).

7. The bridge variable cross-section formwork system according to claim 6, characterized in that: Both ends of the steel belt section (61) are provided with mounting cavities (611), and the steel belt connector (62) comprises two connecting pins (621) and two connecting buckles (622), and the two connecting pins (621) are respectively inserted into the mounting cavities (611) of two adjacent steel belt sections (61), and one of the connecting buckles (622) is simultaneously engaged with one end of the two connecting pins (621), and the other connecting buckle (622) is simultaneously engaged with the other end of the two connecting pins (621).

8. The bridge variable cross-section formwork system according to claim 6, characterized in that: The outer template (10) comprises a straight segment outer template (11), a supplementary segment outer template (12) and an arc segment outer template (13) which are connected in sequence, the straight segment outer template (11) is arranged relative to the straight segment inner template (21), the supplementary segment outer template (12) is arranged relative to the supplementary segment inner template (22), and the arc segment outer template (13) is arranged relative to the arc segment inner template (23); The bridge variable-section formwork system (100) further comprises an outer formwork ratchet adjuster (70), wherein the outer formwork ratchet adjuster (70) is fixed to the straight segment outer formwork (11) and is used to adjust the tightness between the plurality of steel belt sections (61).

9. The bridge variable cross-section formwork system according to claim 8, characterized in that: Two of the steel belt sections (61) located at the straight segment outer template (11) are provided with a first tooth pattern portion (612) and a second tooth pattern portion (613) on the sides away from each other; The outer mold ratchet adjuster (70) comprises two gear assemblies (71) and an adjusting assembly (72); the two gear assemblies (71) are arranged at intervals and respectively cooperate with the first toothed portion (612) and the second toothed portion (613); the adjusting assembly (72) is used to drive one of the gear assemblies (71) to rotate, so as to drive the two steel belt sections (61) to move in opposite directions.

10. The bridge variable cross-section formwork system according to claim 1, characterized in that: The bridge variable-section formwork system (100) further comprises at least one second adjustment support rod (42), one end of the second adjustment support rod (42) being slidably matched with the step-by-step adjustment truss (32), and the other end of the second adjustment support rod (42) being hinged to the supplementary segment inner formwork (22); and / or, The bridge variable-section formwork system (100) further comprises a plurality of inner mold stiffening ribs (81), wherein the plurality of inner mold stiffening ribs (81) are fixedly arranged on a side of the inner formwork (20) away from the outer formwork (10), and are arranged at intervals along the circumference of the inner formwork (20), the straight segment truss (31) is fixedly connected to the plurality of inner mold stiffening ribs (81), and the first adjustment support rod (41) is hinged to the inner mold stiffening rib (81); and / or, The bridge variable-section formwork system (100) further comprises a plurality of outer formwork stiffening ribs (82), wherein the plurality of outer formwork stiffening ribs (82) are fixedly arranged on a side of the outer formwork (10) away from the inner formwork (20) and are arranged at intervals along the circumference of the outer formwork (10); and / or, The bridge variable-section formwork system (100) further comprises a shaped inner support steel ring (83), wherein the shaped inner support steel ring (83) is arranged on the top of the outer formwork (10) and is located on a side of the outer formwork (10) close to the inner formwork (20).

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