Cantilever hanging basket formwork system for variable cross slope bridge and construction method

Abstract

The invention provides a cantilever hanging basket formwork system for a variable cross slope bridge and a construction method, and belongs to the technical field of cantilever hanging basket formwork systems. A flange plate formwork and a side formwork are connected through a first hinge and can adapt to the angle change of the flange plate formwork, a first fillet steel plate is additionally arranged, and the hinge is of a high-strength pin shaft and lug plate structure; one end of each pin shaft is provided with a hole and fixed through a plug pin, the other end of each pin shaft is designed to be a detachable buckle, adjustment or maintenance in construction is facilitated, and in order to prevent concrete slurry leakage, fillet steel plates are arranged at the junctions of the outer side baffles, the flange plate formworks and the side formworks respectively. Inclined struts are additionally arranged on the outer sides of outer rods of the rectangular trusses and used for fixing the posture of the formwork and sharing concrete side pressure. Therefore, flexible adjustment of the formwork is achieved through the modular hinge sets and the adjustable supporting rods, the formwork is suitable for construction of variable-cross-section and curve-section flange plates, dynamic adjustment of a cross slope is achieved, construction efficiency and precision are improved, and construction cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of cantilever hanging basket formwork systems, and in particular relates to a cantilever hanging basket formwork system for a variable transverse slope bridge and a construction method. Background Art

[0002] With the continuous development of bridge construction, the requirements for bridge alignment and driving comfort are becoming increasingly stringent. In particular, curved beams have dynamic cross-sectional slope changes as their alignment changes. Therefore, as mentioned in the existing technical solution with patent publication number "CN117684482A", during the construction of variable-section cantilever hanging baskets, the traditional hanging basket web side formwork and flange plate formwork use a rigid connection, which cannot meet the dynamic adjustment of the variable cross-sectional slope. Most cross-sectional slopes are adjusted by bridge deck pavement, resulting in high material consumption and construction costs. Therefore, there is an urgent need for a formwork connection technology that can achieve fast and accurate cross-sectional slope adjustment and reliable locking. Summary of the Invention

[0003] In order to solve the defects in the existing technology, the present invention provides a cantilever hanging basket formwork system and construction method for variable cross-slope bridges, which effectively avoids the defects in the existing technology that the hanging basket web side formwork and the flange plate formwork adopt a rigid connection that cannot meet the dynamic adjustment of the variable cross-slope, and most of the cross-section slope is adjusted by bridge deck pavement, resulting in large material consumption and high construction cost.

[0004] The present invention utilizes the following technical solutions.

[0005] A cantilever hanging basket formwork system for a variable slope bridge, comprising:

[0006] Formwork systems and auxiliary supports;

[0007] The formwork system includes a flange plate formwork and a vertically arranged side formwork. The flange plate formwork is located on the top of the side formwork and is connected to the side formwork via a hinge.

[0008] Furthermore, hinge 1 is a double-ear plate clamp type hinge, which includes two ear plates, and the two ear plates are respectively connected to both sides of the pin shaft. The pin shaft is inserted in the swivel in a transition fit manner, and the pin shaft can rotate in the swivel.

[0009] Furthermore, the two ear plates of hinge 1 are fixedly connected to the flange plate formwork and the side formwork respectively.

[0010] Furthermore, the structure in which the two ear plates of the hinge 1 are fixedly connected to the flange plate formwork and the side formwork respectively includes:

[0011] A number of through-type positioning holes are opened on the two ear plates. The positioning holes on the two ear plates are respectively arranged opposite to the number of limit grooves opened on the flange plate template and the side template. The limit grooves are screw holes, and the limit grooves and positioning holes arranged opposite to each other are screwed and fixedly connected by a number of bolts.

[0012] Furthermore, a rounded steel plate is provided at the junction of the flange plate formwork and the side formwork.

[0013] Furthermore, the end of the flange plate formwork that is farther from the side formwork is connected to the outer baffle through hinge 2.

[0014] Furthermore, the hinge 2 is also a double-ear plate clamping hinge, and the two ear plates of the hinge 2 are fixedly connected to the flange plate template and the outer baffle respectively.

[0015] Furthermore, a second rounded steel plate is provided at the junction of the flange plate formwork and the outer baffle.

[0016] Furthermore, an adjustable support frame is provided between the flange plate formwork and the bottom formwork.

[0017] Furthermore, the adjustable support frame includes an outer sleeve and an inner sleeve arranged in the outer sleeve. The outer sleeve is provided with a plurality of through-type screw holes 1 arranged from top to bottom, and the inner sleeve is provided with through-type screw holes 2. A pair of through-type screw holes 1 and through-type screw holes 2 are screwed together with screws. Therefore, by moving the outer sleeve up and down, a different pair of through-type screw holes 1 and through-type screw holes 2 can be screwed together with screws, thereby realizing the function of adjusting the height of the adjustable support frame.

[0018] Furthermore, the bottom mold includes a rectangular truss outer rod, a serrated truss outer rod is arranged in the rectangular truss outer rod, and a diagonal brace is further arranged between the outer side of the serrated truss outer rod and the top thereof.

[0019] Furthermore, one end of the pin shaft is fixed with a hole and the other end is designed as a detachable buckle.

[0020] A construction method for a cantilever hanging basket formwork system for a variable slope bridge, comprising:

[0021] Step 1: Basket positioning, that is, moving the basket to the target position and adjusting the bottom mold elevation through the hydraulic system;

[0022] Step 2: Formwork adjustment, i.e. adjusting the adjustable support rods at the bottom of the flange plate formwork to make the bridge's transverse slope meet the design requirements;

[0023] Step 3: Concrete pouring, that is, pouring the flange plate formwork and web plate in layers, and monitoring the deformation of the flange plate formwork;

[0024] Step 4: De-moulding and transfer, that is, first remove the bottom support rod of the flange plate, rotate the side formwork away from the concrete surface, lower the bottom formwork as a whole, and move the hanging basket forward to the next section.

[0025] The beneficial effects of the present invention are as follows:

[0026] The flange formwork of the present invention is connected to the side formwork via a hinge, which can adapt to changes in the flange formwork angle. A rounded steel plate is also added. The hinge utilizes a high-strength pin and lug structure. One end of the pin is fixed with a hole and a pin, while the other end is designed as a removable clip, facilitating adjustment or maintenance during construction. To prevent concrete leakage, rounded steel plates are installed at the junction of the outer baffle, flange formwork, and side formwork. To facilitate adjustment of the flange angle and the verticality of the formwork, the rounded steel plates are welded on one side and have a sliding wedge-shaped cross-section on the other side, ensuring the high-quality appearance requirements of the bridge. For auxiliary support, an adjustable support frame is installed on the back of the flange formwork, forming a three-point support system to reduce hinge loads. Diagonal braces are added to the outer side of the rectangular truss outer rods to fix the formwork posture and share the lateral pressure of concrete. Thus, the modular hinge assembly and adjustable support rods enable flexible formwork adjustment, making it suitable for the construction of flanges with variable cross-sections and curved sections, enabling dynamic adjustment of the cross slope, improving construction efficiency and precision, and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the overall structural diagram of the cantilever hanging basket formwork system used for the variable slope bridge in the present invention;

[0028] Figure 2 This is a structural diagram of the double-ear plate clamping hinge of the present invention;

[0029] Figure 3 It is a structural diagram of the adjustable support frame in the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely express the technical solutions of the present invention. The embodiments expressed in this application are only part of the embodiments of the present invention, not all of the embodiments. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without making creative work are all within the scope of protection of the present invention.

[0031] like Figures 1 to 3 As shown, the cantilever hanging basket formwork system for a variable slope bridge according to the present invention comprises:

[0032] Formwork systems and auxiliary supports;

[0033] The formwork system includes a flange plate formwork 2 and a vertically arranged side formwork 1. The flange plate formwork 2 is located on the top of the side formwork 1 and is connected to the side formwork 1 through a hinge 3.

[0034] In a preferred but non-limiting embodiment of the present invention, hinge 1 3 is a double-ear plate clamp hinge, which includes two ear plates 4, and the two ear plates 4 are respectively connected to the two sides of the pin 5. The pin 5 is inserted in the swivel in a transition fit manner, and the pin 5 can rotate in the swivel.

[0035] In a preferred but non-limiting embodiment of the present invention, the two ear plates 4 of the hinge 1 3 are fixedly connected to the flange plate formwork 2 and the side formwork 1 respectively.

[0036] In a preferred but non-limiting embodiment of the present invention, the structure in which the two ear plates 4 of the hinge 1 3 are fixedly connected to the flange plate formwork 2 and the side formwork 1 respectively includes:

[0037] A number of through-type positioning holes are opened on the two ear plates 4. The several positioning holes on the two ear plates 4 are respectively arranged opposite to the several limiting grooves opened on the flange plate template 2 and the side template 1. The limiting grooves are screw holes, and the limiting grooves and positioning holes arranged opposite to each other are screwed and fixedly connected by a number of bolts.

[0038] In a preferred but non-limiting embodiment of the present invention, a rounded steel plate 6 is provided at the junction of the flange plate formwork 2 and the side formwork 1.

[0039] In a preferred but non-limiting embodiment of the present invention, the end of the flange plate formwork 2 that is farther from the side formwork 1 is connected to the outer baffle 7 via a hinge 2 8 .

[0040] In a preferred but non-limiting embodiment of the present invention, the second hinge 8 is also a double-ear plate clamping hinge, and the two ear plates of the second hinge 8 are fixedly connected to the flange plate template 2 and the outer baffle 7 respectively.

[0041] In a preferred but non-limiting embodiment of the present invention, a rounded steel plate 9 is provided at the junction of the flange plate formwork 2 and the outer baffle 7 .

[0042] In a preferred but non-limiting embodiment of the present invention, an adjustable support frame 10 is provided between the flange plate formwork 2 and the bottom formwork.

[0043] In a preferred but non-limiting embodiment of the present invention, the adjustable support frame 10 includes an outer sleeve 14 and an inner sleeve 15 arranged in the outer sleeve, and a plurality of through-type screw holes 1 arranged from top to bottom are opened on the outer sleeve, and a through-type screw hole 2 is opened on the inner sleeve. A pair of through-type screw holes 1 and through-type screw holes 2 are screwed together with screws, so that by moving the outer sleeve up and down, a different pair of through-type screw holes 1 and through-type screw holes 2 can be screwed together with screws, thereby realizing the function of adjusting the height of the adjustable support frame 10.

[0044] In a preferred but non-limiting embodiment of the present invention, the bottom mold includes a rectangular truss outer rod 11, a serrated truss outer rod 12 is arranged in the rectangular truss outer rod 11, and a diagonal brace 13 is further arranged between the outer side of the serrated truss outer rod 12 and its top.

[0045] In a preferred but non-limiting embodiment of the present invention, one end of the pin 5 is fixed with a hole and a plug, and the other end is designed as a detachable buckle.

[0046] Specifically, the flange plate formwork and the side formwork are connected by a hinge, which can adapt to the angle change of the flange plate formwork, and a rounded steel plate (thickness not less than 2mm) is added.

[0047] Double-ear plate clamp-type hinges are used at the junctions of the outer baffle, flange plate formwork and side formwork, and limit grooves are set on both sides of the hinge point, with a group arranged every 0.5 to 1m.

[0048] The hinge adopts a high-strength pin + ear plate structure, the pin diameter is ≥40mm (material Q345B), the ear plate thickness is ≥20mm, one end of the pin is fixed with a hole and the other end is designed as a detachable buckle to facilitate adjustment or maintenance during construction.

[0049] In order to prevent concrete leakage, rounded steel plates are set at the junction of the outer baffle, flange plate formwork and side formwork. In order to facilitate the adjustment of the flange plate angle and the verticality of the formwork, the rounded steel plate is welded on one side and the other side is a sliding wedge section to ensure the high quality requirements of the bridge appearance.

[0050] For auxiliary support, an adjustable support frame is installed on the back of the flange plate formwork to form a three-point support system, reducing hinge loads. Diagonal braces are added to the outer side of the rectangular truss outer rods to stabilize the formwork and share the lateral pressure of the concrete.

[0051] The construction method of a cantilever hanging basket formwork system for a variable slope bridge according to the present invention comprises:

[0052] Step 1: Basket positioning, that is, moving the basket to the target position and adjusting the bottom mold elevation through the hydraulic system;

[0053] Step 2: Formwork adjustment, i.e. adjusting the adjustable support rods at the bottom of the flange plate formwork to make the bridge's transverse slope meet the design requirements;

[0054] Step 3: Concrete pouring, that is, pouring the flange plate formwork and web plate in layers, and monitoring the deformation of the flange plate formwork (lateral displacement ≤ 3mm);

[0055] Step 4: De-moulding and transfer, that is, first remove the bottom support rod of the flange plate, rotate the side formwork away from the concrete surface, lower the bottom formwork as a whole, and move the hanging basket forward to the next section.

[0056] During bridge and building structure construction, flanges and webs are typically cast in layers. During this process, the flange formwork is susceptible to displacement or deformation due to factors such as concrete lateral pressure, pouring temperature, and support system deformation. This can affect structural dimensional accuracy and even lead to quality and safety incidents. Existing techniques for monitoring formwork deformation often rely on manual measurement or local fixed-point measurements. This results in low monitoring frequency, limited coverage, and delayed response, making it difficult to meet the demands of real-time monitoring during construction.

[0057] Step 3 of the present invention is a method for real-time, continuous and high-precision monitoring of the deformation of the flange plate formwork, thereby improving the construction quality control level and reducing the construction risks caused by formwork instability or excessive deformation.

[0058] In a preferred but non-limiting embodiment of the present invention, step 3 specifically comprises:

[0059] Step 3 enables real-time monitoring of flange plate formwork deformation during the layered pouring process, improving the accuracy and response speed of formwork deformation monitoring. Through multi-point deployment and data analysis, the deformation trend of the formwork system can be fully understood, timely warnings can be issued, and construction safety and structural quality can be guaranteed. The specific steps are as follows:

[0060] Step 3-1: Deploy sensors;

[0061] In a preferred but non-limiting embodiment of the present invention, in step 3-1, high-precision displacement sensors, including laser ranging sensors, fiber grating (FBG) sensors or linear variable differential transformers (LVDTs), are arranged at the longitudinal and transverse key stress points, boundary support areas and deformation-sensitive parts of the flange plate formwork to ensure multi-dimensional synchronous monitoring of the three-dimensional deformation of the formwork under the action of concrete side pressure; the sensor arrangement spacing is optimized based on the structural stress model and historical deformation data to form a spatially distributed monitoring network.

[0062] Multiple high-precision displacement sensors are evenly distributed in the key nodes of the flange plate formwork support structure, the edge connection parts of the formwork, and the junction between the web and the flange plate, which are prone to deformation. Specifically, they include:

[0063] Laser distance measuring sensor: installed on the lower support beam of the flange plate formwork, used to measure the overall sinking of the formwork in the vertical direction;

[0064] Fiber Bragg grating (FBG) sensor: embedded in the template structure to monitor small deformations in local areas of the template;

[0065] Linear Variable Differential Transformer (LVDT): Installed at the connection point between the formwork support rods and the structure, used to measure the displacement changes of the supporting structure.

[0066] The sensor layout spacing is optimized based on the template structure stress model and historical construction data to ensure that the deformation characteristics of the template at different stages of the concrete pouring process can be captured.

[0067] Step 3-2: Real-time data collection and transmission;

[0068] In a preferred but non-limiting embodiment of the present invention, in step 3-2, each sensor is synchronously sampled by an embedded data acquisition system to obtain real-time displacement data of the template at each time node during the pouring process; the acquisition system uses a wireless sensor network or a wired high-speed transmission method to upload the data to the central processing unit in real time to ensure the timeliness and integrity of the data.

[0069] During the concrete pouring process, all sensors collect formwork displacement data in real time and transmit this data synchronously via a wireless sensor network to a central data processing unit on-site. This processing unit has high-frequency sampling capabilities (sampling frequency ≥ 10Hz), ensuring accurate recording of the formwork's dynamic deformation during pouring.

[0070] To improve the reliability of data collection, the system adopts a dual-channel redundant transmission mechanism to ensure that data continuity can be maintained when a communication link fails.

[0071] Step 3-3: Deformation feature modeling and analysis

[0072] In a preferred but non-restrictive embodiment of the present invention, in step 3-3, the central processing unit establishes a theoretical deformation curve of the template during the pouring process based on the structural mechanics model and the finite element simulation results; the real-time collected displacement data is compared with the theoretical model, and the time series analysis and spatial interpolation methods are used to identify the local abnormal deformation trend of the template, thereby realizing a dynamic evaluation of the template structure state.

[0073] Based on structural mechanics theory, the central processing unit established a theoretical deformation model for the formwork during layered web concrete pouring. This model considers the distribution of concrete lateral pressure with height and uses the following formula to calculate the lateral pressure on the formwork at a specific pouring layer height h:

[0074] p(h)=ρ*g*h

[0075] p(h) represents the lateral pressure on the template at height h (Pa);

[0076] ρ represents the density of concrete (kg / m 3 );

[0077] g represents the acceleration due to gravity (m / s 2 );

[0078] h represents the concrete pouring height (m).

[0079] Based on the above-mentioned lateral pressure distribution model, the central processing unit uses the finite element method to simulate the stress of the template structure and obtain the theoretical deformation curve of the template at different pouring stages.

[0080] During the actual construction process, the central processing unit compares the displacement data collected by the sensor with the theoretical deformation curve and calculates the deformation deviation of the template at a certain moment using the following formula:

[0081] Δd i =|d measured,i -d theoretical,i |

[0082] Where: Δd i represents the deformation deviation of the i-th sensor position; d measured,i represents the displacement value measured by the i-th sensor; d theoretical,i Represents the theoretical predicted displacement value corresponding to the i-th position.

[0083] If the deformation deviation of a certain sensor position exceeds a preset threshold (eg, 5 mm), the central processing unit determines that there is a risk of abnormal deformation of the template in that area.

[0084] Step 3-4: Multi-level early warning and feedback control

[0085] In a preferred but non-restrictive embodiment of the present invention, in steps 3-4, the central processing unit establishes a theoretical deformation curve of the template during the pouring process based on the structural mechanics model and finite element simulation results; the deformation state of the template is graded and judged according to the preset deformation threshold and warning level; when it is detected that the deformation of a certain part of the template exceeds the allowable range, the system automatically triggers a multi-level warning signal and interacts with the construction equipment through the industrial control interface to control the pouring speed or suspend construction, and pushes the warning information to the on-site management personnel terminal to assist decision-making and emergency response.

[0086] The central processing unit sets up a three-level early warning mechanism:

[0087] Level 1 warning (deformation deviation ≤ 3mm): The central processing unit records data and reminds construction personnel to pay attention;

[0088] Level 2 warning (3mm<deformation deviation≤5mm): The central processing unit pushes warning information to the on-site management terminal and recommends reducing the pouring speed;

[0089] Level 3 warning (deformation deviation > 5mm): The central processing unit automatically triggers the construction equipment to pause the concrete pouring, and reminds on-site personnel to check and reinforce through sound and light alarms.

[0090] During one construction process, when the web concrete was poured to the third layer (approximately 1.5m high), the central processing unit detected a displacement deviation of 4.8mm at a support point on the flange plate formwork. This triggered a Level 2 warning and immediately sent a warning message to the construction manager, suggesting adjustments to the pouring schedule. The construction team then reduced the pumping speed and partially reinforced the formwork support central processing unit, successfully avoiding the risk of formwork instability.

[0091] This embodiment fully demonstrates the real-time monitoring capability of the present solution on the deformation of the flange plate formwork during the layered pouring process, thereby ensuring construction safety and structural quality.

[0092] Multiple displacement sensors are arranged at key stress-bearing locations and deformation-sensitive areas of the flange plate formwork. The sensors include but are not limited to laser rangefinders, linear variable differential transformers (LVDTs), or fiber grating sensors. The displacement data of each sensor is collected in real time through a data acquisition system and transmitted to a central processing unit. The central processing unit analyzes the collected displacement data based on a preset deformation threshold and a formwork deformation model to determine whether abnormal deformation of the formwork has occurred. When it is detected that the formwork deformation exceeds the set threshold, the system automatically triggers an early warning signal, prompting construction personnel to take appropriate measures.

[0093] The beneficial effects of the present invention are as follows:

[0094] The flange formwork of the present invention is connected to the side formwork via a hinge, which can adapt to changes in the flange formwork angle. A rounded steel plate is also added. The hinge utilizes a high-strength pin and lug structure. One end of the pin is fixed with a hole and a pin, while the other end is designed as a removable clip, facilitating adjustment or maintenance during construction. To prevent concrete leakage, rounded steel plates are installed at the junction of the outer baffle, flange formwork, and side formwork. To facilitate adjustment of the flange angle and the verticality of the formwork, the rounded steel plates are welded on one side and have a sliding wedge-shaped cross-section on the other side, ensuring the high-quality appearance requirements of the bridge. For auxiliary support, an adjustable support frame is installed on the back of the flange formwork, forming a three-point support system to reduce hinge loads. Diagonal braces are added to the outer side of the rectangular truss outer rods to fix the formwork posture and share the lateral pressure of concrete. Thus, the modular hinge assembly and adjustable support rods enable flexible formwork adjustment, making it suitable for the construction of flanges with variable cross-sections and curved sections, enabling dynamic adjustment of the cross slope, improving construction efficiency and precision, and reducing construction costs.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention should be covered within the protection space of the claims of the present invention.

Claims

1. A cantilever hanging basket formwork system for variable slope bridges, characterized in that: include: Formwork systems and auxiliary supports; The formwork system includes a flange plate formwork and a vertically arranged side formwork. The flange plate formwork is located on the top of the side formwork and is connected to the side formwork via a hinge.

2. The cantilever hanging basket formwork system for variable slope bridges according to claim 1 is characterized in that: Hinge 1 is a double-ear plate clamp type hinge, which includes two ear plates, which are respectively connected to both sides of the pin shaft. The pin shaft is inserted into the swivel in a transition fit manner, and the pin shaft can rotate in the swivel.

3. The cantilever hanging basket formwork system for variable slope bridges according to claim 2 is characterized in that: The two lugs of hinge 1 are fixedly connected to the flange plate formwork and the side formwork respectively; The structure in which the two lugs of hinge 1 are fixedly connected to the flange plate formwork and the side formwork respectively includes: A number of through-type positioning holes are opened on the two ear plates. The positioning holes on the two ear plates are respectively arranged opposite to the number of limit grooves opened on the flange plate template and the side template. The limit grooves are screw holes, and the limit grooves and positioning holes arranged opposite to each other are screwed and fixedly connected by a number of bolts.

4. The cantilever hanging basket formwork system for a variable slope bridge according to claim 3 is characterized in that: A rounded steel plate is provided at the junction of the flange plate formwork and the side formwork; The end of the flange plate formwork farther from the side formwork is connected to the outer baffle through hinge 2; Hinge 2 is also a double-ear plate clamping hinge, and the two ear plates of hinge 2 are fixedly connected to the flange plate template and the outer baffle respectively.

5. The cantilever hanging basket formwork system for variable slope bridges according to claim 4 is characterized in that: A second rounded steel plate is provided at the junction of the flange plate formwork and the outer baffle.

6. The cantilever hanging basket formwork system for a variable slope bridge according to claim 5, characterized in that: An adjustable support frame is provided between the flange plate formwork and the bottom formwork.

7. The cantilever hanging basket formwork system for a variable slope bridge according to claim 6, characterized in that: The adjustable support frame includes an outer sleeve and an inner sleeve arranged in the outer sleeve. The outer sleeve is provided with a plurality of through-type screw holes 1 arranged from top to bottom, and the inner sleeve is provided with through-type screw holes 2. A pair of through-type screw holes 1 and through-type screw holes 2 are screwed together with screws. Therefore, by moving the outer sleeve up and down, a different pair of through-type screw holes 1 and through-type screw holes 2 can be screwed together with screws, thereby realizing the function of adjusting the height of the adjustable support frame.

8. The cantilever hanging basket formwork system for a variable slope bridge according to claim 7, characterized in that: The bottom mold comprises a rectangular truss outer rod, a serrated truss outer rod is arranged in the rectangular truss outer rod, and an oblique brace is arranged between the outer side of the serrated truss outer rod and the top thereof.

9. The cantilever hanging basket formwork system for a variable slope bridge according to claim 8, characterized in that: One end of the pin is fixed with a hole and the other end is designed as a detachable buckle.

10. A construction method for a cantilever hanging basket formwork system for a variable slope bridge, characterized in that: include: Step 1: Basket positioning, that is, moving the basket to the target position and adjusting the bottom mold elevation through the hydraulic system; Step 2: Formwork adjustment, i.e. adjusting the adjustable support rods at the bottom of the flange plate formwork to make the bridge's transverse slope meet the design requirements; Step 3: Concrete pouring, that is, pouring the flange plate formwork and web plate in layers, and monitoring the deformation of the flange plate formwork; Step 4: De-moulding and transfer, that is, first remove the bottom support rod of the flange plate, rotate the side formwork away from the concrete surface, lower the bottom formwork as a whole, and move the hanging basket forward to the next section.

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