Construction method based on deck type arch bridge one-time pouring

Abstract

The invention relates to the field of bridge construction, in particular to a construction method based on one-time pouring of a deck type arch bridge, an arch ring support is arranged, cross rods located at the top of the arch ring support are top cross rods, the top cross rods are combined to form an arch supporting face, and the radian of the arch supporting face is consistent with that of the arch bridge. An arc-shaped steel pipe which is bent and formed in advance is laid on the arch-shaped supporting face and fixed through fasteners; wood transverse rods are laid on the arc-shaped steel pipes, strip steel bottom dies are laid on the wood transverse rods in a segmented mode, side die pressing mechanisms are arranged on the steel plates, when side dies are installed, the side dies are placed between the wood formworks and the side die pressing mechanisms, and the side dies are fixed to the side walls of the wood formworks by pushing the side die pressing mechanisms to form pouring formworks. And the next section is poured before initial setting of the concrete of the previous section, and after all the sections are poured, maintenance is carried out until the design strength is achieved. By implementing the method, the construction period is shortened, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction, and in particular to a construction method based on one-time casting of a deck arch bridge. Background Art

[0002] Small to medium-span arch bridges, typically with a distance between the arch feet of 20 to 40 meters, are widely used in urban roads, rural highways, and small river crossings. To better control structural deformation and stress during construction, the arch rings of these bridges are typically poured in sections.

[0003] However, in actual construction, it was found that the segmented pouring construction had the following problems: 1. The construction period is too long. On the one hand, the segmented pouring requires multiple times of formwork construction and dismantling. On the other hand, each section needs to be cured separately after pouring. Only after it reaches the preset strength can the next section be poured. The curing period of each section of concrete ranges from 7 to 28 days. 2. The process is complicated. On the one hand, because a large number of densely packed steel bars need to be tied to the main body of the arch ring before pouring to form reinforced concrete with the concrete, steel bar holes corresponding to the number and position of the steel bars need to be pre-machined on the template when closing the mold. This processing procedure is not only cumbersome, but also requires extremely high processing precision, and the processing must be highly consistent with the position of the steel bars tied on site. On the other hand, before pouring the next section of concrete, the end face of the previous section of solidified concrete needs to be roughened to ensure a good bond between the new and old concrete. The roughening process is not only time-consuming and labor-intensive, but may also cause certain damage to the already poured part.

[0004] 3. The construction is difficult. During construction, in order to insert the numerous dense steel bars into the steel bar holes of the template one by one, the construction workers need to move the steel bars one by one by hand and insert them into the steel bar holes. However, most of the steel bar ends are not straight, so the construction workers need to use greater force to move them. In addition, what is more serious is that the construction workers are often scratched by the steel bar ends during the construction process. In summary, in order to solve the problems caused by the segmented casting of existing arch bridges, a construction method that can achieve casting in one go is designed. Summary of the Invention

[0005] The present invention aims to provide a construction method based on one-time casting of a deck arch bridge, which solves the problems of long construction period and complicated procedures in segmented casting.

[0006] To achieve the above object, the present invention adopts the following technical solution: a construction method based on one-time casting of a deck arch bridge, comprising the following construction steps: Arch frame erection: The vertical poles, horizontal poles, longitudinal poles and shear braces are erected into an arch support. The horizontal pole at the top of the arch support is the top horizontal pole. The top horizontal poles are combined into an arch support surface. The curvature of the arch support surface is consistent with the curvature of the arch bridge. The pre-bent curved steel pipe is laid on the arch support surface and fixed with fasteners. Arch preloading: Preload the counterweight at 1.1 times the weight of the structural concrete within the preloading range. If the arch sinking volume meets the requirements after 3 days of preloading, remove the counterweight. Formwork installation: Wooden crossbars are laid on the curved steel pipes, and the strip steel bottom formwork is laid on the wooden crossbars in sections. The strip steel bottom formwork consists of steel plates and wooden formwork fixed above the steel plates. The end face of each section of wooden formwork facing the arch bridge apex is a wedge surface, which faces the upper surface of the arch bridge. Side formwork is installed on both sides of the strip steel bottom formwork to form a casting formwork, and steel bars are tied inside the casting formwork. Concrete pouring: When pouring concrete, it should be poured in sections along the longitudinal direction of the arch ring and symmetrically, and each section needs to be poured continuously within the same period of time. The pouring of the latter section should be carried out before the initial setting of the concrete of the previous section. After all sections are poured, they should be cured until the design strength is reached. Preferably, as an improvement, the lengths of the steel plates and wooden formworks of each steel bottom formwork along the transverse direction of the arch bridge are consistent, and the two are installed in an offset manner, with the offset installation length being 5-10 cm. When laying, the wooden formwork of the upper section with steel bottom formwork is laid on the steel plate of the lower section with steel bottom formwork.

[0007] Preferably, as an improvement, the side mold clamping mechanism includes a slide rail fixed on the steel plate and a clamping plate sliding on the slide rail, the slide rail is set perpendicular to the wooden formwork, and a locking mechanism for locking the clamping plate is provided on the steel plate.

[0008] Preferably, as an improvement, the pressing plate is provided with a sliding fixing structure on the side close to the wooden formwork, and the sliding fixing structure is a sliding channel. The sliding channel is provided with an opening on the side facing the wooden formwork, and the opening longitudinally passes through the sliding channel, and the vertical height of the opening is smaller than the vertical height of the sliding channel; a block for sliding in the sliding channel is provided on the side formwork, and when the block slides in the sliding channel, the bottom of the side formwork contacts the upper surface of the steel plate.

[0009] Preferably, as an improvement, the locking mechanism is located on the side of the pressing plate away from the wooden formwork, and includes a support block fixed on the steel plate, the support block is threadedly connected to a locking plate, and the locking plate faces the pressing plate.

[0010] Preferably, as an improvement, a top formwork is installed on the top surface of the casting formwork with a large slope, a back rib is provided on the top formwork and is reinforced by tension screws passing through the arch ring.

[0011] Preferably, as an improvement, when installing the side form, first slide the clamping block of the side form along the sliding channel of the pressing plate, and then push the side form to press against the wooden formwork.

[0012] The principles and advantages of this solution are: This solution successfully achieved one-time casting of the arch bridge by improving the support system and casting mold construction method. The details are as follows: 1. For the support system In the traditional support system, the curved steel pipe is supported by countless jacks, that is, a jack is installed on each vertical pole, and the support of the curved steel pipe is achieved by adjusting the height of each jack. However, in actual adjustment, it is difficult to ensure that each jack is adjusted in place, and it fails to fully contact the curved steel pipe, causing it to be partially suspended. In addition, because the support surface of the jack is flat (horizontal) and the curved steel pipe is overall curved, the contact between the two is actually linear contact, making the jack fail to provide effective support. In summary, the jack does not achieve sufficient support. For segmented pouring, this is not a big problem, but for one-time pouring, due to the large amount of concrete poured at one time, its support stability is at great risk.

[0013] Therefore, the top support is eliminated in this solution and replaced with a top cross bar. By combining the top cross bars into an arched support surface, the curvature of the arched support surface is consistent with the curvature of the arch bridge. Through this design, the support stability is improved in the following two aspects: 1. The same row of supports is upgraded from the single-point independent support of the traditional design to the overall continuous support, so that the support structure is evenly stressed; 2. The top cross bar is a circular structure with an arc-shaped surface, so when it contacts the arc-shaped steel pipe, it is a surface contact, which increases the support contact area.

[0014] In addition, through the improvement of the above support system, in addition to the improvement of support stability, the applicant also found the following effects: 1. Significantly shortened construction period: Traditional jacking supports are independent of each other. Therefore, when adjusting, each jacking support needs to be installed and adjusted independently to match the arch of the curved steel pipe. In this solution, in terms of quantity, one top crossbar can support a row of several jacking supports, greatly reducing the number of installations. In terms of installation and adjustment, this solution only requires adjusting the position of the two ends of the top crossbar to achieve the height adjustment of the entire top crossbar, greatly reducing the amount of adjustment. Therefore, the construction period is greatly shortened, and the labor intensity of the construction personnel is also reduced.

[0015] 2. It can effectively solve the problem of rebound deformation of curved steel pipes: curved steel pipes are bent into shape by a bending process. The curved steel pipes after forming will have a certain rebound force themselves. When combined with the top support, the two have only a supporting relationship but no fixed relationship, which causes a certain rebound deformation at both ends of the curved steel pipe, thereby causing an error in the arch degree of the arch ring. In this solution, the curved steel pipe is fixedly connected to the top cross bar, and the curved steel pipe and the arch frame are connected into a whole, which effectively suppresses the autonomous rebound of the curved steel pipe, ensures that the arch degree of the arch ring after overall forming is closer to the designed arch degree, and the load distribution of the arch ring is even, which helps to improve the overall structural stability of the bridge.

[0016] 2. For pouring formwork Traditional casting formwork is usually composed of a wooden base plate and side forms. To prevent the side forms from exploding, or between adjacent side forms, during the concrete pouring and / or vibration process, the side forms need to be fastened to the bottom form with several screws. Connectors are also required between the two side forms to ensure the stability of the connection. Primary and secondary back ribs, as well as two layers of tie bolts, also need to be installed on the side forms. This method not only complicates the side formwork structure, but also consumes a lot of time and labor when setting up and removing the formwork. During installation, a large number of screws need to be nailed in, and these need to be removed one by one when removing the formwork. This also requires the cooperation of two people. More importantly, this method poses a greater risk of exploding, as the concrete pouring method requires a one-time completion.

[0017] Therefore, in order to improve the strength and stability of the casting formwork and avoid the risk of mold explosion during the one-time casting process, the following effects are achieved through the implementation of this casting formwork: 1. The stability of the casting formwork is significantly improved. The steel-clad bottom membrane of this solution is composed of steel plates and wooden formwork, and the two are installed in a front-to-back staggered manner. When laying, the upper section of wooden formwork with steel bottom formwork is laid on the steel plate of the lower section with steel bottom formwork, so that the end faces of the two sections of wooden formwork with steel bottom formwork are in close contact with the end faces of the steel plates. At the same time, the connection between the wooden formwork and the steel plate is located on different vertical planes. On the one hand, the two sections of steel bottom formwork are formed into a whole, which improves the stability of the entire bottom formwork; on the other hand, the connection seam between the two bottom formworks is changed from the traditional straight line to the Z-shape of this solution, which greatly reduces the risk of leakage from the bottom formwork.

[0018] At the same time, a side formwork clamping mechanism is provided on the steel plate for compacting and reinforcing the supporting stability of the side formwork. Compared with the traditional method of reinforcement by screws, this solution does not realize the mutual connection and fixation by the connecting force between the side formworks and the connection between the side formworks and the bottom formworks, but compacts and reinforces the side formworks by means of the compacting supporting force. This not only makes the side formworks evenly stressed and improves its strength to withstand lateral extrusion force, but also greatly improves the clamping force between the side formworks and the wooden formworks, so that the side formworks and the bottom formworks are tightly spliced ​​without gaps, thus avoiding the risk of leakage.

[0019] 2. It speeds up the installation of side formwork and reduces labor. Compared with the traditional installation method of fixing side formwork with screws, this solution only requires one person to complete the installation. That is, one construction worker places the side formwork between the wooden formwork and the side formwork clamping mechanism, pushes the side formwork clamping mechanism to fix the side formwork to the wooden formwork, and then locks the locking mechanism. To remove the formwork, simply release the locking mechanism and remove the side formwork. This simple and convenient operation process, and the quick installation and removal greatly shortens the construction period.

[0020] In summary, by enhancing the stability of the support system and the robustness of the casting molds, small and medium-sized arch bridges can be cast in a single step. This significantly addresses the complex, long, and difficult construction process associated with the existing segmented casting process. Furthermore, the arch frame erection and casting formwork installation phases significantly shorten the construction period, simplifying the construction process and labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of an arch bridge with arch frames.

[0022] Figure 2 This is a structural diagram of the arch.

[0023] Figure 3 This is a partial schematic diagram of the casting formwork.

[0024] Figure 4 Schematic diagram of the sequence of pouring arch ring concrete.

[0025] Figure 5 It is a top view of the steel bottom mold.

[0026] Figure 6 It is a structural diagram of the side mold clamping mechanism when clamping the side mold.

[0027] The figure marks in the drawings of the specification include: arch ring bracket 1, top cross bar 2, arc-shaped steel pipe 3, casting formwork 4, steel bottom formwork 40, steel plate 41, wooden formwork 42, side formwork clamping mechanism 5, slide rail 51, clamping plate 52, sliding channel 53, clamping block 54, locking mechanism 6, support block 61, distance adjusting screw 62, locking plate 63, side formwork 7, top formwork 8, steel pipe back rib 9, and tension screw 10. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods: A construction method based on one-time pouring of a deck arch bridge includes the following construction steps: Arch erection: Figure 1 、 Figure 2 As shown, an arch ring bracket 1 is constructed by arranging vertical poles, horizontal poles, longitudinal poles and shear braces, wherein the horizontal pole located at the top of the arch ring bracket 1 is a top horizontal pole 2, and each top horizontal pole 2 is combined into an arched support surface, the curvature of the arched support surface is consistent with the curvature of the arch bridge, that is, the top horizontal poles 2 are laid and fixed according to the arch curvature of the arch bridge, so that all the top horizontal poles 2 together form an arched support surface, and then a pre-bent 48mm×3.5mm arc-shaped steel pipe 3 is laid on the arched support surface, and then the arc-shaped steel pipe 3 and the top horizontal pole 2 are directly fixed by fasteners; Arch preloading: Preload the counterweight at 1.1 times the weight of the structural concrete within the preloading range. If the arch sinking volume meets the requirements after 3 days of preloading, remove the counterweight. Formwork installation: Lay wooden crossbars (4cm×9cm wooden beams) on the curved steel pipe 3 with a spacing of 0.2~0.3m, and tie them with No. 8 iron wire. Lay the strip steel bottom formwork 40 in sections on the wooden crossbars. There are multiple installation holes on the strip steel bottom formwork 40. During actual installation, fix the strip steel bottom formwork 40 and the wooden crossbars with iron nails through the installation holes. A side formwork clamping mechanism 5 is provided on the steel plate 41. When installing the side formwork, place the side formwork between the wooden formwork 42 and the side formwork clamping mechanism 5. Push the side formwork clamping mechanism 5 to fix the side formwork to the side wall of the wooden formwork 42 to form a casting formwork 4. Rebar binding is constructed inside the casting formwork 4. In addition, if Figure 3 As shown, a top formwork 8 is installed on the top surface of the casting formwork 4 with a large slope, a steel pipe back rib 9 is installed on the upper side of the top formwork 8, and a tension screw 10 is provided between the steel pipe back rib 9 and the top cross bar 2. The tension screw 10 passes through the arch ring to reinforce the formwork assembly, and a vibration port and a concrete feed port are reserved on the top formwork 8 plate.

[0029] The specific structure of the strip steel bottom mold 40 is: like Figure 5 、 Figure 6As shown, the steel bottom formwork 40 includes a steel plate 41 and a wooden formwork 42 fixed above the steel plate 41. The thickness of the wooden formwork 42 is 12mm-15mm, and the thickness of the steel plate 41 is 3-4mm. Since side formwork clamping mechanisms 5 are provided on both sides of the steel plate 41, if the thickness of the steel plate 41 is too small, it is easy to bend and deform. During on-site pouring construction, the support under the steel plate 41 is not a solid plane, but wooden cross bars laid at intervals. Therefore, the side formwork clamping mechanisms 5 and locking mechanisms 6 installed on both sides of the steel plate 41 cannot play a role of stable support, which leads to the side formwork being unable to fit tightly with the wooden formwork 42 during the clamping process, resulting in the risk of leakage and mold explosion. Therefore, the steel plate 41 is designed within the above range, which can not only meet the support strength around the steel plate 41, but also control the weight and cost of the steel plate 41. The steel plate 41 and the wooden formwork 42 of the steel bottom formwork 40 along the horizontal direction of the arch bridge are the same length, and the two are installed in an offset manner with a length of 5-10 cm, that is, the steel plate 41 at one end of the steel bottom formwork 40 is longer than the end face of the wooden formwork 42, and the steel plate 41 at the other end of the steel bottom formwork 40 is shorter than the wooden formwork 42.

[0030] In existing segmented casting technology, when installing the side forms, to prevent formwork from exploding between the side and bottom forms, or between adjacent side forms, during concrete pouring and / or vibration, the side forms must be fastened to the bottom form with several screws. Primary and secondary back ribs, as well as two layers of tie bolts, must also be installed on the side forms. This approach not only complicates the side formwork structure but also consumes significant time and labor during formwork erection and dismantling. Numerous screws must be installed during installation and removed individually during dismantling, requiring the coordination of two people. More importantly, this approach carries a high risk of formwork exploding, given the requirement for a single concrete pour.

[0031] To address the aforementioned issues, the present invention incorporates a steel plate 41 on the side of the steel bottom form 40, which protrudes from the end surface of the wooden form 42 and forms a mounting portion for the steel plate 41. A side form clamping mechanism 5 is slidably mounted on this mounting portion. By mounting the side form mounting mechanism and the wooden form 42 on the steel plate 41, the three become a single unit, facilitating stability throughout the pouring process. The side form clamping mechanism 5 comprises a slide rail 51 welded to the steel plate 41 and a clamping plate 52 that slides on the rail 51. The rails 51 comprise at least two rails. This allows for both sliding adjustment and removal of the clamping plate 52, facilitating quick demoulding of the side and bottom forms. Furthermore, assembly and disassembly are quick: when in use, the clamping plate 52 can be mounted by sliding it onto one end of the rail 51. When not in use, the clamping plate 52 can be removed, making it convenient and quick. Furthermore, when not in use, the clamping plate 52 saves space during storage and transportation. The sliding direction of the pressure plate 52 is toward the wooden formwork 42. The height of the pressure plate 52 is at least 0.4 times the height of the side formwork, and preferably 0.7 times in this embodiment. A locking mechanism 6 for locking the pressure plate 52 is installed on the steel plate 41. The locking mechanism 6 is located on the side of the pressure plate 52 away from the wooden formwork 42. The locking mechanism 6 includes a support block 61 welded to the steel plate 41. A pitch adjustment screw 62 is threadedly connected to the support block 61. A locking plate 63 is welded to the end of the pitch adjustment screw 62, and the locking plate 63 faces the pressure plate 52. To achieve rapid pitch adjustment and locking, the front section of the pitch adjustment screw 62 is a smooth rod that can quickly push the pressure plate 52 to press the side formwork 7 against the wooden formwork 42. The rear section is a threaded rod to achieve locking and fixation after pressing.

[0032] Since the thickness of the wooden formwork 42 is only 12mm-15mm, when the clamping plate 52 presses the side formwork against the side wall of the wooden formwork 42, the side formwork will tilt toward the inside of the casting formwork 4 or even collapse. Therefore, in order to ensure the stability of the side formwork after installation, this solution provides a sliding fixing structure on the side of the clamping plate 52 close to the wooden formwork 42. The sliding fixing structure is a sliding channel 53. The sliding channel 53 is provided with an opening on the side facing the wooden formwork 42. The opening longitudinally passes through the sliding channel 53. The vertical height of the opening is less than the vertical height of the sliding channel 53. Specifically, a C-shaped groove, a dovetail groove, etc. can be used; a block 54 for sliding in the sliding channel 53 is fixedly installed on the side formwork. When the block 54 slides in the sliding channel 53, the bottom of the side formwork contacts the upper surface of the steel plate 41.

[0033] Specific installation method of the template: Installation of the steel bottom formwork 40: During laying, the wooden formwork 42 of the upper section of the steel bottom formwork 40 is laid on the steel plate 41 of the lower section of the steel bottom formwork 40, so that the end faces of the wooden formwork 42 of the two sections of the steel bottom formwork 40 are in close contact, and the end faces of the steel plate 41 are in close contact. At the same time, the connection between the wooden formwork 42 and the connection between the steel plate 41 are located on different vertical planes, thereby forming the two sections of the steel bottom formwork 40 into a whole, thereby improving the stability of the entire bottom formwork.

[0034] Side formwork installation: After the strip bottom formwork 40 is installed (or partially installed), begin installing the side formwork. Install the clamping plate 52 on the slide rail 51. That is, slide the clamping plate 52 into the slide rail 51 from one end of the slide rail 51. Secure the side formwork block 54 to the clamping plate 52 along the sliding channel 53 of the clamping plate 52. First, push the distance adjustment screw 62 of the locking mechanism 6 so that the clamping plate 52 drives the side formwork 7 to press against the wooden formwork 42. Then, tighten the distance adjustment screw 62 to lock the clamping plate 52.

[0035] Concrete pouring: When pouring concrete, it should be poured in sections along the longitudinal direction of the arch ring and symmetrically. Each section needs to be poured continuously within the same period of time. The pouring of the latter section should be carried out before the initial setting of the former section. Figure 4 As shown, concrete pouring is carried out symmetrically in sections from the arch foot to the arch top. Section 1 is poured first, and section 3 is poured last. After all sections are poured, they are cured until the design strength is reached.

[0036] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A construction method based on one-time pouring of a deck arch bridge, characterized by: The construction steps include: Arch frame erection: The arch ring support is erected by vertical poles, horizontal poles, longitudinal poles and shear braces. The horizontal pole located at the top of the arch ring support is the top horizontal pole. The top horizontal poles are combined into an arch support surface. The curvature of the arch support surface is consistent with the curvature of the arch bridge. The pre-bent curved steel pipe is laid on the arch support surface and fixed with fasteners. Arch preloading: Preload the counterweight at 1.1 times the weight of the structural concrete within the preloading range. If the arch sinking volume meets the requirements after 3 days of preloading, remove the counterweight. Formwork installation: Wooden crossbars are laid on the curved steel pipes, and the steel bottom formwork is laid in sections on the wooden crossbars. The steel bottom formwork consists of a steel plate and a wooden formwork fixed above the steel plate. The steel plate is equipped with a side formwork clamping mechanism. When installing the side formwork, the side formwork is placed between the wooden formwork and the side formwork clamping mechanism. The side formwork is fixed to the side wall of the wooden formwork by pushing the side formwork clamping mechanism to form a casting formwork. Rebar binding is then carried out inside the casting formwork. Concrete pouring: When pouring concrete, it should be poured in sections along the longitudinal direction of the arch ring and symmetrically, and each section needs to be poured continuously within the same period of time. The pouring of the latter section should be carried out before the initial setting of the concrete of the previous section. After all sections are poured, they should be cured until the design strength is reached.

2. The construction method based on one-time casting of a deck arch bridge according to claim 1, characterized in that: The length of the steel plate and wooden formwork of each steel bottom formwork along the horizontal direction of the arch bridge is the same, and the two are installed in an offset manner with a length of 5-10cm. When laying, the wooden formwork of the upper section with steel bottom formwork is laid on the steel plate of the lower section with steel bottom formwork.

3. The construction method based on one-time casting of a deck arch bridge according to claim 2, characterized in that: The side formwork clamping mechanism includes a slide rail fixed on a steel plate and a clamping plate sliding on the slide rail. The slide rail is arranged perpendicular to the wooden formwork, and a locking mechanism for locking the clamping plate is provided on the steel plate.

4. The construction method for one-time casting of a deck arch bridge according to claim 3, characterized in that: The pressing plate is provided with a sliding fixing structure on the side close to the wooden formwork, and the sliding fixing structure is a sliding channel. The sliding channel is provided with an opening on the side facing the wooden formwork, and the opening longitudinally passes through the sliding channel. The vertical height of the opening is smaller than the vertical height of the sliding channel; a block for sliding in the sliding channel is provided on the side formwork, and when the block slides in the sliding channel, the bottom of the side formwork contacts the upper surface of the steel plate.

5. The construction method based on one-time casting of a deck arch bridge according to claim 4, characterized in that: The locking mechanism is located on the side of the pressing plate away from the wooden formwork, and includes a support block fixed on the steel plate, a locking plate being threadedly connected to the support block, and the locking plate facing the pressing plate.

6. The construction method based on one-time casting of a deck arch bridge according to claim 5, characterized in that: A top formwork is installed on the top surface of the casting formwork with a large slope. A back rib is set on the top formwork and reinforced by passing tension screws through the arch ring.

7. The construction method based on one-time casting of a deck arch bridge according to claim 6, characterized in that: When installing the side form, first slide the side form block along the sliding channel of the pressing plate, and then push the side form to press against the wooden formwork.

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